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* [PULL 00/20] Net patches
@ 2024-06-04  7:37 Jason Wang
  2024-06-04  7:37 ` [PULL 01/20] tap: Remove tap_probe_vnet_hdr_len() Jason Wang
                   ` (21 more replies)
  0 siblings, 22 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Jason Wang

The following changes since commit 3ab42e46acf867c45bc929fcc37693e327a35a24:

  Merge tag 'pull-ufs-20240603' of https://gitlab.com/jeuk20.kim/qemu into staging (2024-06-03 08:18:14 -0500)

are available in the Git repository at:

  https://github.com/jasowang/qemu.git tags/net-pull-request

for you to fetch changes up to dcab53611191f50cf4feabc1d8794d04afe53407:

  ebpf: Added traces back. Changed source set for eBPF to 'system'. (2024-06-04 15:14:26 +0800)

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----------------------------------------------------------------
Akihiko Odaki (18):
      tap: Remove tap_probe_vnet_hdr_len()
      tap: Remove qemu_using_vnet_hdr()
      net: Move virtio-net header length assertion
      net: Remove receive_raw()
      tap: Call tap_receive_iov() from tap_receive()
      tap: Shrink zeroed virtio-net header
      virtio-net: Do not propagate ebpf-rss-fds errors
      virtio-net: Add only one queue pair when realizing
      virtio-net: Copy header only when necessary
      virtio-net: Shrink header byte swapping buffer
      virtio-net: Disable RSS on reset
      virtio-net: Unify the logic to update NIC state for RSS
      virtio-net: Always set populate_hash
      virtio-net: Do not write hashes to peer buffer
      ebpf: Fix RSS error handling
      ebpf: Return 0 when configuration fails
      ebpf: Refactor tun_rss_steering_prog()
      ebpf: Add a separate target for skeleton

Alexey Dobriyan (1):
      virtio-net: drop too short packets early

Andrew Melnychenko (1):
      ebpf: Added traces back. Changed source set for eBPF to 'system'.

 ebpf/ebpf_rss.c          |    7 +
 ebpf/rss.bpf.skeleton.h  | 1558 +++++++++++++++++++++++-----------------------
 ebpf/trace.h             |    1 +
 hw/net/e1000e.c          |    1 -
 hw/net/igb.c             |    1 -
 hw/net/net_tx_pkt.c      |    4 +-
 hw/net/virtio-net.c      |  282 ++++-----
 hw/net/vmxnet3.c         |    2 -
 include/net/net.h        |    8 -
 net/dump.c               |    4 +-
 net/net.c                |   47 +-
 net/netmap.c             |    5 -
 net/tap-bsd.c            |    5 -
 net/tap-linux.c          |   20 -
 net/tap-solaris.c        |    5 -
 net/tap-stub.c           |    5 -
 net/tap.c                |   77 +--
 net/tap_int.h            |    1 -
 tools/ebpf/Makefile.ebpf |   15 +-
 tools/ebpf/rss.bpf.c     |   44 +-
 20 files changed, 968 insertions(+), 1124 deletions(-)
 create mode 100644 ebpf/trace.h



^ permalink raw reply	[flat|nested] 42+ messages in thread

* [PULL 01/20] tap: Remove tap_probe_vnet_hdr_len()
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 02/20] tap: Remove qemu_using_vnet_hdr() Jason Wang
                   ` (20 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Michael S . Tsirkin, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

It was necessary since an Linux older than 2.6.35 may implement the
virtio-net header but may not allow to change its length. Remove it
since such an old Linux is no longer supported.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/tap-bsd.c     |  5 -----
 net/tap-linux.c   | 20 --------------------
 net/tap-solaris.c |  5 -----
 net/tap-stub.c    |  5 -----
 net/tap.c         |  8 ++------
 net/tap_int.h     |  1 -
 6 files changed, 2 insertions(+), 42 deletions(-)

diff --git a/net/tap-bsd.c b/net/tap-bsd.c
index 274ea7bd2c..b4c84441ba 100644
--- a/net/tap-bsd.c
+++ b/net/tap-bsd.c
@@ -217,11 +217,6 @@ int tap_probe_has_uso(int fd)
     return 0;
 }
 
-int tap_probe_vnet_hdr_len(int fd, int len)
-{
-    return 0;
-}
-
 void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
 }
diff --git a/net/tap-linux.c b/net/tap-linux.c
index c7e514ecb0..1226d5fda2 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -185,26 +185,6 @@ int tap_probe_has_uso(int fd)
     return 1;
 }
 
-/* Verify that we can assign given length */
-int tap_probe_vnet_hdr_len(int fd, int len)
-{
-    int orig;
-    if (ioctl(fd, TUNGETVNETHDRSZ, &orig) == -1) {
-        return 0;
-    }
-    if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {
-        return 0;
-    }
-    /* Restore original length: we can't handle failure. */
-    if (ioctl(fd, TUNSETVNETHDRSZ, &orig) == -1) {
-        fprintf(stderr, "TUNGETVNETHDRSZ ioctl() failed: %s. Exiting.\n",
-                strerror(errno));
-        abort();
-        return -errno;
-    }
-    return 1;
-}
-
 void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
     if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {
diff --git a/net/tap-solaris.c b/net/tap-solaris.c
index 08b13af512..51b7830bef 100644
--- a/net/tap-solaris.c
+++ b/net/tap-solaris.c
@@ -221,11 +221,6 @@ int tap_probe_has_uso(int fd)
     return 0;
 }
 
-int tap_probe_vnet_hdr_len(int fd, int len)
-{
-    return 0;
-}
-
 void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
 }
diff --git a/net/tap-stub.c b/net/tap-stub.c
index 4b24f61e3a..38673434cb 100644
--- a/net/tap-stub.c
+++ b/net/tap-stub.c
@@ -52,11 +52,6 @@ int tap_probe_has_uso(int fd)
     return 0;
 }
 
-int tap_probe_vnet_hdr_len(int fd, int len)
-{
-    return 0;
-}
-
 void tap_fd_set_vnet_hdr_len(int fd, int len)
 {
 }
diff --git a/net/tap.c b/net/tap.c
index baaa2f7a9a..72ae95894f 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -259,11 +259,7 @@ static bool tap_has_vnet_hdr(NetClientState *nc)
 
 static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
 {
-    TAPState *s = DO_UPCAST(TAPState, nc, nc);
-
-    assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
-
-    return !!tap_probe_vnet_hdr_len(s->fd, len);
+    return tap_has_vnet_hdr(nc);
 }
 
 static int tap_get_vnet_hdr_len(NetClientState *nc)
@@ -432,7 +428,7 @@ static TAPState *net_tap_fd_init(NetClientState *peer,
      * Make sure host header length is set correctly in tap:
      * it might have been modified by another instance of qemu.
      */
-    if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) {
+    if (vnet_hdr) {
         tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len);
     }
     tap_read_poll(s, true);
diff --git a/net/tap_int.h b/net/tap_int.h
index 9a2175655b..8857ff299d 100644
--- a/net/tap_int.h
+++ b/net/tap_int.h
@@ -35,7 +35,6 @@ ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen);
 
 void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp);
 int tap_probe_vnet_hdr(int fd, Error **errp);
-int tap_probe_vnet_hdr_len(int fd, int len);
 int tap_probe_has_ufo(int fd);
 int tap_probe_has_uso(int fd);
 void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo,
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 02/20] tap: Remove qemu_using_vnet_hdr()
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
  2024-06-04  7:37 ` [PULL 01/20] tap: Remove tap_probe_vnet_hdr_len() Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 03/20] net: Move virtio-net header length assertion Jason Wang
                   ` (19 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

Since qemu_set_vnet_hdr_len() is always called when
qemu_using_vnet_hdr() is called, we can merge them and save some code.

For consistency, express that the virtio-net header is not in use by
returning 0 with qemu_get_vnet_hdr_len() instead of having a dedicated
function, qemu_get_using_vnet_hdr().

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/e1000e.c     |  1 -
 hw/net/igb.c        |  1 -
 hw/net/net_tx_pkt.c |  4 ++--
 hw/net/virtio-net.c |  3 ---
 hw/net/vmxnet3.c    |  2 --
 include/net/net.h   |  7 -------
 net/dump.c          |  4 +---
 net/net.c           | 24 +-----------------------
 net/netmap.c        |  5 -----
 net/tap.c           | 28 +---------------------------
 10 files changed, 5 insertions(+), 74 deletions(-)

diff --git a/hw/net/e1000e.c b/hw/net/e1000e.c
index edc101eaf6..843892ce09 100644
--- a/hw/net/e1000e.c
+++ b/hw/net/e1000e.c
@@ -352,7 +352,6 @@ e1000e_init_net_peer(E1000EState *s, PCIDevice *pci_dev, uint8_t *macaddr)
     for (i = 0; i < s->conf.peers.queues; i++) {
         nc = qemu_get_subqueue(s->nic, i);
         qemu_set_vnet_hdr_len(nc->peer, sizeof(struct virtio_net_hdr));
-        qemu_using_vnet_hdr(nc->peer, true);
     }
 }
 
diff --git a/hw/net/igb.c b/hw/net/igb.c
index 1ef6170465..b92bba402e 100644
--- a/hw/net/igb.c
+++ b/hw/net/igb.c
@@ -349,7 +349,6 @@ igb_init_net_peer(IGBState *s, PCIDevice *pci_dev, uint8_t *macaddr)
     for (i = 0; i < s->conf.peers.queues; i++) {
         nc = qemu_get_subqueue(s->nic, i);
         qemu_set_vnet_hdr_len(nc->peer, sizeof(struct virtio_net_hdr));
-        qemu_using_vnet_hdr(nc->peer, true);
     }
 }
 
diff --git a/hw/net/net_tx_pkt.c b/hw/net/net_tx_pkt.c
index b7b1de816d..1f79b82b77 100644
--- a/hw/net/net_tx_pkt.c
+++ b/hw/net/net_tx_pkt.c
@@ -582,7 +582,7 @@ static void net_tx_pkt_sendv(
 {
     NetClientState *nc = opaque;
 
-    if (qemu_get_using_vnet_hdr(nc->peer)) {
+    if (qemu_get_vnet_hdr_len(nc->peer)) {
         qemu_sendv_packet(nc, virt_iov, virt_iov_cnt);
     } else {
         qemu_sendv_packet(nc, iov, iov_cnt);
@@ -812,7 +812,7 @@ static bool net_tx_pkt_do_sw_fragmentation(struct NetTxPkt *pkt,
 
 bool net_tx_pkt_send(struct NetTxPkt *pkt, NetClientState *nc)
 {
-    bool offload = qemu_get_using_vnet_hdr(nc->peer);
+    bool offload = qemu_get_vnet_hdr_len(nc->peer);
     return net_tx_pkt_send_custom(pkt, offload, net_tx_pkt_sendv, nc);
 }
 
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 24e5e7d347..ff600b3002 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3778,9 +3778,6 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
 
     peer_test_vnet_hdr(n);
     if (peer_has_vnet_hdr(n)) {
-        for (i = 0; i < n->max_queue_pairs; i++) {
-            qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
-        }
         n->host_hdr_len = sizeof(struct virtio_net_hdr);
     } else {
         n->host_hdr_len = 0;
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 707487c636..63a9187773 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -2091,8 +2091,6 @@ static void vmxnet3_net_init(VMXNET3State *s)
     if (s->peer_has_vhdr) {
         qemu_set_vnet_hdr_len(qemu_get_queue(s->nic)->peer,
             sizeof(struct virtio_net_hdr));
-
-        qemu_using_vnet_hdr(qemu_get_queue(s->nic)->peer, 1);
     }
 
     qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
diff --git a/include/net/net.h b/include/net/net.h
index b1f9b35fcc..6fe5a0aee8 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -57,8 +57,6 @@ typedef bool (HasUfo)(NetClientState *);
 typedef bool (HasUso)(NetClientState *);
 typedef bool (HasVnetHdr)(NetClientState *);
 typedef bool (HasVnetHdrLen)(NetClientState *, int);
-typedef bool (GetUsingVnetHdr)(NetClientState *);
-typedef void (UsingVnetHdr)(NetClientState *, bool);
 typedef void (SetOffload)(NetClientState *, int, int, int, int, int, int, int);
 typedef int (GetVnetHdrLen)(NetClientState *);
 typedef void (SetVnetHdrLen)(NetClientState *, int);
@@ -88,10 +86,7 @@ typedef struct NetClientInfo {
     HasUso *has_uso;
     HasVnetHdr *has_vnet_hdr;
     HasVnetHdrLen *has_vnet_hdr_len;
-    GetUsingVnetHdr *get_using_vnet_hdr;
-    UsingVnetHdr *using_vnet_hdr;
     SetOffload *set_offload;
-    GetVnetHdrLen *get_vnet_hdr_len;
     SetVnetHdrLen *set_vnet_hdr_len;
     SetVnetLE *set_vnet_le;
     SetVnetBE *set_vnet_be;
@@ -194,8 +189,6 @@ bool qemu_has_ufo(NetClientState *nc);
 bool qemu_has_uso(NetClientState *nc);
 bool qemu_has_vnet_hdr(NetClientState *nc);
 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len);
-bool qemu_get_using_vnet_hdr(NetClientState *nc);
-void qemu_using_vnet_hdr(NetClientState *nc, bool enable);
 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
                       int ecn, int ufo, int uso4, int uso6);
 int qemu_get_vnet_hdr_len(NetClientState *nc);
diff --git a/net/dump.c b/net/dump.c
index 16073f2458..956e34a123 100644
--- a/net/dump.c
+++ b/net/dump.c
@@ -154,10 +154,8 @@ static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr,
                                        int iovcnt, NetPacketSent *sent_cb)
 {
     NetFilterDumpState *nfds = FILTER_DUMP(nf);
-    int offset = qemu_get_using_vnet_hdr(nf->netdev) ?
-                 qemu_get_vnet_hdr_len(nf->netdev) : 0;
 
-    dump_receive_iov(&nfds->ds, iov, iovcnt, offset);
+    dump_receive_iov(&nfds->ds, iov, iovcnt, qemu_get_vnet_hdr_len(nf->netdev));
     return 0;
 }
 
diff --git a/net/net.c b/net/net.c
index a2f0c828bb..bd51037ebf 100644
--- a/net/net.c
+++ b/net/net.c
@@ -529,24 +529,6 @@ bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
     return nc->info->has_vnet_hdr_len(nc, len);
 }
 
-bool qemu_get_using_vnet_hdr(NetClientState *nc)
-{
-    if (!nc || !nc->info->get_using_vnet_hdr) {
-        return false;
-    }
-
-    return nc->info->get_using_vnet_hdr(nc);
-}
-
-void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
-{
-    if (!nc || !nc->info->using_vnet_hdr) {
-        return;
-    }
-
-    nc->info->using_vnet_hdr(nc, enable);
-}
-
 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
                           int ecn, int ufo, int uso4, int uso6)
 {
@@ -559,11 +541,7 @@ void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 
 int qemu_get_vnet_hdr_len(NetClientState *nc)
 {
-    if (!nc || !nc->info->get_vnet_hdr_len) {
-        return 0;
-    }
-
-    return nc->info->get_vnet_hdr_len(nc);
+    return nc->vnet_hdr_len;
 }
 
 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
diff --git a/net/netmap.c b/net/netmap.c
index 241b27c8e9..297510e190 100644
--- a/net/netmap.c
+++ b/net/netmap.c
@@ -351,10 +351,6 @@ static bool netmap_has_vnet_hdr(NetClientState *nc)
     return netmap_has_vnet_hdr_len(nc, sizeof(struct virtio_net_hdr));
 }
 
-static void netmap_using_vnet_hdr(NetClientState *nc, bool enable)
-{
-}
-
 static void netmap_set_vnet_hdr_len(NetClientState *nc, int len)
 {
     NetmapState *s = DO_UPCAST(NetmapState, nc, nc);
@@ -393,7 +389,6 @@ static NetClientInfo net_netmap_info = {
     .has_ufo = netmap_has_vnet_hdr,
     .has_vnet_hdr = netmap_has_vnet_hdr,
     .has_vnet_hdr_len = netmap_has_vnet_hdr_len,
-    .using_vnet_hdr = netmap_using_vnet_hdr,
     .set_offload = netmap_set_offload,
     .set_vnet_hdr_len = netmap_set_vnet_hdr_len,
 };
diff --git a/net/tap.c b/net/tap.c
index 72ae95894f..c848844955 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -262,13 +262,6 @@ static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
     return tap_has_vnet_hdr(nc);
 }
 
-static int tap_get_vnet_hdr_len(NetClientState *nc)
-{
-    TAPState *s = DO_UPCAST(TAPState, nc, nc);
-
-    return s->host_vnet_hdr_len;
-}
-
 static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
@@ -280,23 +273,7 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
 
     tap_fd_set_vnet_hdr_len(s->fd, len);
     s->host_vnet_hdr_len = len;
-}
-
-static bool tap_get_using_vnet_hdr(NetClientState *nc)
-{
-    TAPState *s = DO_UPCAST(TAPState, nc, nc);
-
-    return s->using_vnet_hdr;
-}
-
-static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
-{
-    TAPState *s = DO_UPCAST(TAPState, nc, nc);
-
-    assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
-    assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
-
-    s->using_vnet_hdr = using_vnet_hdr;
+    s->using_vnet_hdr = true;
 }
 
 static int tap_set_vnet_le(NetClientState *nc, bool is_le)
@@ -394,10 +371,7 @@ static NetClientInfo net_tap_info = {
     .has_uso = tap_has_uso,
     .has_vnet_hdr = tap_has_vnet_hdr,
     .has_vnet_hdr_len = tap_has_vnet_hdr_len,
-    .get_using_vnet_hdr = tap_get_using_vnet_hdr,
-    .using_vnet_hdr = tap_using_vnet_hdr,
     .set_offload = tap_set_offload,
-    .get_vnet_hdr_len = tap_get_vnet_hdr_len,
     .set_vnet_hdr_len = tap_set_vnet_hdr_len,
     .set_vnet_le = tap_set_vnet_le,
     .set_vnet_be = tap_set_vnet_be,
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 03/20] net: Move virtio-net header length assertion
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
  2024-06-04  7:37 ` [PULL 01/20] tap: Remove tap_probe_vnet_hdr_len() Jason Wang
  2024-06-04  7:37 ` [PULL 02/20] tap: Remove qemu_using_vnet_hdr() Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 04/20] net: Remove receive_raw() Jason Wang
                   ` (18 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

The virtio-net header length assertion should happen for any clients.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/net.c | 5 +++++
 net/tap.c | 3 ---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/net.c b/net/net.c
index bd51037ebf..db096765f4 100644
--- a/net/net.c
+++ b/net/net.c
@@ -56,6 +56,7 @@
 #include "net/filter.h"
 #include "qapi/string-output-visitor.h"
 #include "qapi/qobject-input-visitor.h"
+#include "standard-headers/linux/virtio_net.h"
 
 /* Net bridge is currently not supported for W32. */
 #if !defined(_WIN32)
@@ -550,6 +551,10 @@ void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
         return;
     }
 
+    assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
+           len == sizeof(struct virtio_net_hdr) ||
+           len == sizeof(struct virtio_net_hdr_v1_hash));
+
     nc->vnet_hdr_len = len;
     nc->info->set_vnet_hdr_len(nc, len);
 }
diff --git a/net/tap.c b/net/tap.c
index c848844955..49edf6c2b6 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -267,9 +267,6 @@ static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
 
     assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
-    assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
-           len == sizeof(struct virtio_net_hdr) ||
-           len == sizeof(struct virtio_net_hdr_v1_hash));
 
     tap_fd_set_vnet_hdr_len(s->fd, len);
     s->host_vnet_hdr_len = len;
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 04/20] net: Remove receive_raw()
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (2 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 03/20] net: Move virtio-net header length assertion Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 05/20] tap: Call tap_receive_iov() from tap_receive() Jason Wang
                   ` (17 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

While netmap implements virtio-net header, it does not implement
receive_raw(). Instead of implementing receive_raw for netmap, add
virtio-net headers in the common code and use receive_iov()/receive()
instead. This also fixes the buffer size for the virtio-net header.

Fixes: fbbdbddec0 ("tap: allow extended virtio header with hash info")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 include/net/net.h |  1 -
 net/net.c         | 18 ++++++++++++------
 net/tap.c         |  1 -
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/include/net/net.h b/include/net/net.h
index 6fe5a0aee8..c8f679761b 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -72,7 +72,6 @@ typedef struct NetClientInfo {
     NetClientDriver type;
     size_t size;
     NetReceive *receive;
-    NetReceive *receive_raw;
     NetReceiveIOV *receive_iov;
     NetCanReceive *can_receive;
     NetStart *start;
diff --git a/net/net.c b/net/net.c
index db096765f4..6938da05e0 100644
--- a/net/net.c
+++ b/net/net.c
@@ -787,11 +787,7 @@ static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
         offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
     }
 
-    if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
-        ret = nc->info->receive_raw(nc, buffer, offset);
-    } else {
-        ret = nc->info->receive(nc, buffer, offset);
-    }
+    ret = nc->info->receive(nc, buffer, offset);
 
     g_free(buf);
     return ret;
@@ -806,6 +802,8 @@ static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
     MemReentrancyGuard *owned_reentrancy_guard;
     NetClientState *nc = opaque;
     int ret;
+    struct virtio_net_hdr_v1_hash vnet_hdr = { };
+    g_autofree struct iovec *iov_copy = NULL;
 
 
     if (nc->link_down) {
@@ -824,7 +822,15 @@ static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
         owned_reentrancy_guard->engaged_in_io = true;
     }
 
-    if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
+    if ((flags & QEMU_NET_PACKET_FLAG_RAW) && nc->vnet_hdr_len) {
+        iov_copy = g_new(struct iovec, iovcnt + 1);
+        iov_copy[0].iov_base = &vnet_hdr;
+        iov_copy[0].iov_len =  nc->vnet_hdr_len;
+        memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
+        iov = iov_copy;
+    }
+
+    if (nc->info->receive_iov) {
         ret = nc->info->receive_iov(nc, iov, iovcnt);
     } else {
         ret = nc_sendv_compat(nc, iov, iovcnt, flags);
diff --git a/net/tap.c b/net/tap.c
index 49edf6c2b6..99c59ee468 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -360,7 +360,6 @@ static NetClientInfo net_tap_info = {
     .type = NET_CLIENT_DRIVER_TAP,
     .size = sizeof(TAPState),
     .receive = tap_receive,
-    .receive_raw = tap_receive_raw,
     .receive_iov = tap_receive_iov,
     .poll = tap_poll,
     .cleanup = tap_cleanup,
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 05/20] tap: Call tap_receive_iov() from tap_receive()
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (3 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 04/20] net: Remove receive_raw() Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 06/20] tap: Shrink zeroed virtio-net header Jason Wang
                   ` (16 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Zhang, Chen, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

This will save duplicate logic found in both of tap_receive_iov() and
tap_receive().

Suggested-by: "Zhang, Chen" <chen.zhang@intel.com>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/tap.c | 35 +++++------------------------------
 1 file changed, 5 insertions(+), 30 deletions(-)

diff --git a/net/tap.c b/net/tap.c
index 99c59ee468..9825518ff1 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -133,39 +133,14 @@ static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
     return tap_write_packet(s, iovp, iovcnt);
 }
 
-static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size)
-{
-    TAPState *s = DO_UPCAST(TAPState, nc, nc);
-    struct iovec iov[2];
-    int iovcnt = 0;
-    struct virtio_net_hdr_mrg_rxbuf hdr = { };
-
-    if (s->host_vnet_hdr_len) {
-        iov[iovcnt].iov_base = &hdr;
-        iov[iovcnt].iov_len  = s->host_vnet_hdr_len;
-        iovcnt++;
-    }
-
-    iov[iovcnt].iov_base = (char *)buf;
-    iov[iovcnt].iov_len  = size;
-    iovcnt++;
-
-    return tap_write_packet(s, iov, iovcnt);
-}
-
 static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 {
-    TAPState *s = DO_UPCAST(TAPState, nc, nc);
-    struct iovec iov[1];
-
-    if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
-        return tap_receive_raw(nc, buf, size);
-    }
-
-    iov[0].iov_base = (char *)buf;
-    iov[0].iov_len  = size;
+    struct iovec iov = {
+        .iov_base = (void *)buf,
+        .iov_len = size
+    };
 
-    return tap_write_packet(s, iov, 1);
+    return tap_receive_iov(nc, &iov, 1);
 }
 
 #ifndef __sun__
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 06/20] tap: Shrink zeroed virtio-net header
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (4 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 05/20] tap: Call tap_receive_iov() from tap_receive() Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors Jason Wang
                   ` (15 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

tap prepends a zeroed virtio-net header when writing a packet to a
tap with virtio-net header enabled but not in use. This only happens
when s->host_vnet_hdr_len == sizeof(struct virtio_net_hdr).

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 net/tap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tap.c b/net/tap.c
index 9825518ff1..51f7aec39d 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -119,7 +119,7 @@ static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
     const struct iovec *iovp = iov;
     g_autofree struct iovec *iov_copy = NULL;
-    struct virtio_net_hdr_mrg_rxbuf hdr = { };
+    struct virtio_net_hdr hdr = { };
 
     if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
         iov_copy = g_new(struct iovec, iovcnt + 1);
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (5 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 06/20] tap: Shrink zeroed virtio-net header Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-05 10:23   ` Daniel P. Berrangé
  2024-06-04  7:37 ` [PULL 08/20] virtio-net: Add only one queue pair when realizing Jason Wang
                   ` (14 subsequent siblings)
  21 siblings, 1 reply; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

Propagating ebpf-rss-fds errors has several problems.

First, it makes device realization fail and disables the fallback to the
conventional eBPF loading.

Second, it leaks memory by making device realization fail without
freeing memory already allocated.

Third, the convention is to set an error when a function returns false,
but virtio_net_load_ebpf_fds() and virtio_net_load_ebpf() returns false
without setting an error, which is confusing.

Remove the propagation to fix these problems.

Fixes: 0524ea0510a3 ("ebpf: Added eBPF initialization by fds.")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index ff600b3002..3cee2ef3ac 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1329,24 +1329,22 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
     virtio_net_attach_ebpf_to_backend(n->nic, -1);
 }
 
-static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
+static bool virtio_net_load_ebpf_fds(VirtIONet *n)
 {
     int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
     int ret = true;
     int i = 0;
 
-    ERRP_GUARD();
-
     if (n->nr_ebpf_rss_fds != EBPF_RSS_MAX_FDS) {
-        error_setg(errp,
-                  "Expected %d file descriptors but got %d",
-                  EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds);
+        warn_report("Expected %d file descriptors but got %d",
+                    EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds);
        return false;
    }
 
     for (i = 0; i < n->nr_ebpf_rss_fds; i++) {
-        fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], errp);
-        if (*errp) {
+        fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i],
+                                  &error_warn);
+        if (fds[i] < 0) {
             ret = false;
             goto exit;
         }
@@ -1355,7 +1353,7 @@ static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
     ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
 
 exit:
-    if (!ret || *errp) {
+    if (!ret) {
         for (i = 0; i < n->nr_ebpf_rss_fds && fds[i] != -1; i++) {
             close(fds[i]);
         }
@@ -1364,13 +1362,12 @@ exit:
     return ret;
 }
 
-static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
+static bool virtio_net_load_ebpf(VirtIONet *n)
 {
     bool ret = false;
 
     if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
-        if (!(n->ebpf_rss_fds
-                && virtio_net_load_ebpf_fds(n, errp))) {
+        if (!(n->ebpf_rss_fds && virtio_net_load_ebpf_fds(n))) {
             ret = ebpf_rss_load(&n->ebpf_rss);
         }
     }
@@ -3809,7 +3806,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
     net_rx_pkt_init(&n->rx_pkt);
 
     if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
-        virtio_net_load_ebpf(n, errp);
+        virtio_net_load_ebpf(n);
     }
 }
 
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (6 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-10-14  8:30   ` Laurent Vivier
  2024-06-04  7:37 ` [PULL 09/20] virtio-net: Copy header only when necessary Jason Wang
                   ` (13 subsequent siblings)
  21 siblings, 1 reply; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

Multiqueue usage is not negotiated yet when realizing. If more than
one queue is added and the guest never requests to enable multiqueue,
the extra queues will not be deleted when unrealizing and leak.

Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest doesn't support multiqueue")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 3cee2ef3ac..a8db8bfd9c 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3743,9 +3743,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
     n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
                                     n->net_conf.tx_queue_size);
 
-    for (i = 0; i < n->max_queue_pairs; i++) {
-        virtio_net_add_queue(n, i);
-    }
+    virtio_net_add_queue(n, 0);
 
     n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
     qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 09/20] virtio-net: Copy header only when necessary
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (7 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 08/20] virtio-net: Add only one queue pair when realizing Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 10/20] virtio-net: Shrink header byte swapping buffer Jason Wang
                   ` (12 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

The copied header is only used for byte swapping.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a8db8bfd9c..13a17a1e5a 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -360,7 +360,8 @@ static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status)
          * can't do it, we fallback onto fixing the headers in the core
          * virtio-net code.
          */
-        n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs,
+        n->needs_vnet_hdr_swap = n->has_vnet_hdr &&
+                                 virtio_net_set_vnet_endian(vdev, n->nic->ncs,
                                                             queue_pairs, true);
     } else if (virtio_net_started(n, vdev->status)) {
         /* After using the device, we need to reset the network backend to
@@ -2751,7 +2752,7 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
             return -EINVAL;
         }
 
-        if (n->has_vnet_hdr) {
+        if (n->needs_vnet_hdr_swap) {
             if (iov_to_buf(out_sg, out_num, 0, &vhdr, n->guest_hdr_len) <
                 n->guest_hdr_len) {
                 virtio_error(vdev, "virtio-net header incorrect");
@@ -2759,19 +2760,16 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
                 g_free(elem);
                 return -EINVAL;
             }
-            if (n->needs_vnet_hdr_swap) {
-                virtio_net_hdr_swap(vdev, (void *) &vhdr);
-                sg2[0].iov_base = &vhdr;
-                sg2[0].iov_len = n->guest_hdr_len;
-                out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
-                                   out_sg, out_num,
-                                   n->guest_hdr_len, -1);
-                if (out_num == VIRTQUEUE_MAX_SIZE) {
-                    goto drop;
-                }
-                out_num += 1;
-                out_sg = sg2;
+            virtio_net_hdr_swap(vdev, (void *) &vhdr);
+            sg2[0].iov_base = &vhdr;
+            sg2[0].iov_len = n->guest_hdr_len;
+            out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, out_sg, out_num,
+                               n->guest_hdr_len, -1);
+            if (out_num == VIRTQUEUE_MAX_SIZE) {
+                goto drop;
             }
+            out_num += 1;
+            out_sg = sg2;
         }
         /*
          * If host wants to see the guest header as is, we can
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 10/20] virtio-net: Shrink header byte swapping buffer
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (8 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 09/20] virtio-net: Copy header only when necessary Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 11/20] virtio-net: Disable RSS on reset Jason Wang
                   ` (11 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

Byte swapping is only performed for the part of header shared with the
legacy standard and the buffer only needs to cover it.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 13a17a1e5a..dabfa6e7d7 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -676,11 +676,6 @@ static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
 
     n->mergeable_rx_bufs = mergeable_rx_bufs;
 
-    /*
-     * Note: when extending the vnet header, please make sure to
-     * change the vnet header copying logic in virtio_net_flush_tx()
-     * as well.
-     */
     if (version_1) {
         n->guest_hdr_len = hash_report ?
             sizeof(struct virtio_net_hdr_v1_hash) :
@@ -2736,7 +2731,7 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
         ssize_t ret;
         unsigned int out_num;
         struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
-        struct virtio_net_hdr_v1_hash vhdr;
+        struct virtio_net_hdr vhdr;
 
         elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
         if (!elem) {
@@ -2753,18 +2748,18 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
         }
 
         if (n->needs_vnet_hdr_swap) {
-            if (iov_to_buf(out_sg, out_num, 0, &vhdr, n->guest_hdr_len) <
-                n->guest_hdr_len) {
+            if (iov_to_buf(out_sg, out_num, 0, &vhdr, sizeof(vhdr)) <
+                sizeof(vhdr)) {
                 virtio_error(vdev, "virtio-net header incorrect");
                 virtqueue_detach_element(q->tx_vq, elem, 0);
                 g_free(elem);
                 return -EINVAL;
             }
-            virtio_net_hdr_swap(vdev, (void *) &vhdr);
+            virtio_net_hdr_swap(vdev, &vhdr);
             sg2[0].iov_base = &vhdr;
-            sg2[0].iov_len = n->guest_hdr_len;
+            sg2[0].iov_len = sizeof(vhdr);
             out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, out_sg, out_num,
-                               n->guest_hdr_len, -1);
+                               sizeof(vhdr), -1);
             if (out_num == VIRTQUEUE_MAX_SIZE) {
                 goto drop;
             }
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 11/20] virtio-net: Disable RSS on reset
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (9 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 10/20] virtio-net: Shrink header byte swapping buffer Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 12/20] virtio-net: Unify the logic to update NIC state for RSS Jason Wang
                   ` (10 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Michael Tokarev, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

RSS is disabled by default.

Fixes: 590790297c ("virtio-net: implement RSS configuration command")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 70 +++++++++++++++++++++++----------------------
 1 file changed, 36 insertions(+), 34 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index dabfa6e7d7..345ef9a8fd 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -600,40 +600,6 @@ static void virtio_net_queue_enable(VirtIODevice *vdev, uint32_t queue_index)
     }
 }
 
-static void virtio_net_reset(VirtIODevice *vdev)
-{
-    VirtIONet *n = VIRTIO_NET(vdev);
-    int i;
-
-    /* Reset back to compatibility mode */
-    n->promisc = 1;
-    n->allmulti = 0;
-    n->alluni = 0;
-    n->nomulti = 0;
-    n->nouni = 0;
-    n->nobcast = 0;
-    /* multiqueue is disabled by default */
-    n->curr_queue_pairs = 1;
-    timer_del(n->announce_timer.tm);
-    n->announce_timer.round = 0;
-    n->status &= ~VIRTIO_NET_S_ANNOUNCE;
-
-    /* Flush any MAC and VLAN filter table state */
-    n->mac_table.in_use = 0;
-    n->mac_table.first_multi = 0;
-    n->mac_table.multi_overflow = 0;
-    n->mac_table.uni_overflow = 0;
-    memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
-    memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
-    qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
-    memset(n->vlans, 0, MAX_VLAN >> 3);
-
-    /* Flush any async TX */
-    for (i = 0;  i < n->max_queue_pairs; i++) {
-        flush_or_purge_queued_packets(qemu_get_subqueue(n->nic, i));
-    }
-}
-
 static void peer_test_vnet_hdr(VirtIONet *n)
 {
     NetClientState *nc = qemu_get_queue(n->nic);
@@ -3845,6 +3811,42 @@ static void virtio_net_device_unrealize(DeviceState *dev)
     virtio_cleanup(vdev);
 }
 
+static void virtio_net_reset(VirtIODevice *vdev)
+{
+    VirtIONet *n = VIRTIO_NET(vdev);
+    int i;
+
+    /* Reset back to compatibility mode */
+    n->promisc = 1;
+    n->allmulti = 0;
+    n->alluni = 0;
+    n->nomulti = 0;
+    n->nouni = 0;
+    n->nobcast = 0;
+    /* multiqueue is disabled by default */
+    n->curr_queue_pairs = 1;
+    timer_del(n->announce_timer.tm);
+    n->announce_timer.round = 0;
+    n->status &= ~VIRTIO_NET_S_ANNOUNCE;
+
+    /* Flush any MAC and VLAN filter table state */
+    n->mac_table.in_use = 0;
+    n->mac_table.first_multi = 0;
+    n->mac_table.multi_overflow = 0;
+    n->mac_table.uni_overflow = 0;
+    memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
+    memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
+    qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
+    memset(n->vlans, 0, MAX_VLAN >> 3);
+
+    /* Flush any async TX */
+    for (i = 0;  i < n->max_queue_pairs; i++) {
+        flush_or_purge_queued_packets(qemu_get_subqueue(n->nic, i));
+    }
+
+    virtio_net_disable_rss(n);
+}
+
 static void virtio_net_instance_init(Object *obj)
 {
     VirtIONet *n = VIRTIO_NET(obj);
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 12/20] virtio-net: Unify the logic to update NIC state for RSS
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (10 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 11/20] virtio-net: Disable RSS on reset Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 13/20] virtio-net: Always set populate_hash Jason Wang
                   ` (9 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

The code to attach or detach the eBPF program to RSS were duplicated so
unify them into one function to save some code.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 90 ++++++++++++++++++---------------------------
 1 file changed, 36 insertions(+), 54 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 345ef9a8fd..8464eb4082 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1232,18 +1232,6 @@ static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
     }
 }
 
-static void virtio_net_detach_epbf_rss(VirtIONet *n);
-
-static void virtio_net_disable_rss(VirtIONet *n)
-{
-    if (n->rss_data.enabled) {
-        trace_virtio_net_rss_disable();
-    }
-    n->rss_data.enabled = false;
-
-    virtio_net_detach_epbf_rss(n);
-}
-
 static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd)
 {
     NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0);
@@ -1291,6 +1279,40 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
     virtio_net_attach_ebpf_to_backend(n->nic, -1);
 }
 
+static void virtio_net_commit_rss_config(VirtIONet *n)
+{
+    if (n->rss_data.enabled) {
+        n->rss_data.enabled_software_rss = n->rss_data.populate_hash;
+        if (n->rss_data.populate_hash) {
+            virtio_net_detach_epbf_rss(n);
+        } else if (!virtio_net_attach_epbf_rss(n)) {
+            if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
+                warn_report("Can't load eBPF RSS for vhost");
+            } else {
+                warn_report("Can't load eBPF RSS - fallback to software RSS");
+                n->rss_data.enabled_software_rss = true;
+            }
+        }
+
+        trace_virtio_net_rss_enable(n->rss_data.hash_types,
+                                    n->rss_data.indirections_len,
+                                    sizeof(n->rss_data.key));
+    } else {
+        virtio_net_detach_epbf_rss(n);
+        trace_virtio_net_rss_disable();
+    }
+}
+
+static void virtio_net_disable_rss(VirtIONet *n)
+{
+    if (!n->rss_data.enabled) {
+        return;
+    }
+
+    n->rss_data.enabled = false;
+    virtio_net_commit_rss_config(n);
+}
+
 static bool virtio_net_load_ebpf_fds(VirtIONet *n)
 {
     int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
@@ -1455,28 +1477,7 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n,
         goto error;
     }
     n->rss_data.enabled = true;
-
-    if (!n->rss_data.populate_hash) {
-        if (!virtio_net_attach_epbf_rss(n)) {
-            /* EBPF must be loaded for vhost */
-            if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
-                warn_report("Can't load eBPF RSS for vhost");
-                goto error;
-            }
-            /* fallback to software RSS */
-            warn_report("Can't load eBPF RSS - fallback to software RSS");
-            n->rss_data.enabled_software_rss = true;
-        }
-    } else {
-        /* use software RSS for hash populating */
-        /* and detach eBPF if was loaded before */
-        virtio_net_detach_epbf_rss(n);
-        n->rss_data.enabled_software_rss = true;
-    }
-
-    trace_virtio_net_rss_enable(n->rss_data.hash_types,
-                                n->rss_data.indirections_len,
-                                temp.b);
+    virtio_net_commit_rss_config(n);
     return queue_pairs;
 error:
     trace_virtio_net_rss_error(err_msg, err_value);
@@ -3076,26 +3077,7 @@ static int virtio_net_post_load_device(void *opaque, int version_id)
         }
     }
 
-    if (n->rss_data.enabled) {
-        n->rss_data.enabled_software_rss = n->rss_data.populate_hash;
-        if (!n->rss_data.populate_hash) {
-            if (!virtio_net_attach_epbf_rss(n)) {
-                if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
-                    warn_report("Can't post-load eBPF RSS for vhost");
-                } else {
-                    warn_report("Can't post-load eBPF RSS - "
-                                "fallback to software RSS");
-                    n->rss_data.enabled_software_rss = true;
-                }
-            }
-        }
-
-        trace_virtio_net_rss_enable(n->rss_data.hash_types,
-                                    n->rss_data.indirections_len,
-                                    sizeof(n->rss_data.key));
-    } else {
-        trace_virtio_net_rss_disable();
-    }
+    virtio_net_commit_rss_config(n);
     return 0;
 }
 
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 13/20] virtio-net: Always set populate_hash
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (11 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 12/20] virtio-net: Unify the logic to update NIC state for RSS Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 14/20] virtio-net: Do not write hashes to peer buffer Jason Wang
                   ` (8 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

The member is not cleared during reset so may have a stale value.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 8464eb4082..b423169a48 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -651,6 +651,7 @@ static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
         n->guest_hdr_len = n->mergeable_rx_bufs ?
             sizeof(struct virtio_net_hdr_mrg_rxbuf) :
             sizeof(struct virtio_net_hdr);
+        n->rss_data.populate_hash = false;
     }
 
     for (i = 0; i < n->max_queue_pairs; i++) {
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 14/20] virtio-net: Do not write hashes to peer buffer
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (12 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 13/20] virtio-net: Always set populate_hash Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 15/20] ebpf: Fix RSS error handling Jason Wang
                   ` (7 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

The peer buffer is qualified with const and not meant to be modified.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 36 +++++++++++++++++-------------------
 1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index b423169a48..666a4e2a03 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1830,16 +1830,9 @@ static uint8_t virtio_net_get_hash_type(bool hasip4,
     return 0xff;
 }
 
-static void virtio_set_packet_hash(const uint8_t *buf, uint8_t report,
-                                   uint32_t hash)
-{
-    struct virtio_net_hdr_v1_hash *hdr = (void *)buf;
-    hdr->hash_value = hash;
-    hdr->hash_report = report;
-}
-
 static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf,
-                                  size_t size)
+                                  size_t size,
+                                  struct virtio_net_hdr_v1_hash *hdr)
 {
     VirtIONet *n = qemu_get_nic_opaque(nc);
     unsigned int index = nc->queue_index, new_index = index;
@@ -1870,7 +1863,8 @@ static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf,
                                              n->rss_data.hash_types);
     if (net_hash_type > NetPktRssIpV6UdpEx) {
         if (n->rss_data.populate_hash) {
-            virtio_set_packet_hash(buf, VIRTIO_NET_HASH_REPORT_NONE, 0);
+            hdr->hash_value = VIRTIO_NET_HASH_REPORT_NONE;
+            hdr->hash_report = 0;
         }
         return n->rss_data.redirect ? n->rss_data.default_queue : -1;
     }
@@ -1878,7 +1872,8 @@ static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf,
     hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key);
 
     if (n->rss_data.populate_hash) {
-        virtio_set_packet_hash(buf, reports[net_hash_type], hash);
+        hdr->hash_value = hash;
+        hdr->hash_report = reports[net_hash_type];
     }
 
     if (n->rss_data.redirect) {
@@ -1898,7 +1893,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
     VirtQueueElement *elems[VIRTQUEUE_MAX_SIZE];
     size_t lens[VIRTQUEUE_MAX_SIZE];
     struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
-    struct virtio_net_hdr_mrg_rxbuf mhdr;
+    struct virtio_net_hdr_v1_hash extra_hdr;
     unsigned mhdr_cnt = 0;
     size_t offset, i, guest_offset, j;
     ssize_t err;
@@ -1908,7 +1903,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
     }
 
     if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
-        int index = virtio_net_process_rss(nc, buf, size);
+        int index = virtio_net_process_rss(nc, buf, size, &extra_hdr);
         if (index >= 0) {
             NetClientState *nc2 = qemu_get_subqueue(n->nic, index);
             return virtio_net_receive_rcu(nc2, buf, size, true);
@@ -1968,15 +1963,17 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
             if (n->mergeable_rx_bufs) {
                 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
                                     sg, elem->in_num,
-                                    offsetof(typeof(mhdr), num_buffers),
-                                    sizeof(mhdr.num_buffers));
+                                    offsetof(typeof(extra_hdr), hdr.num_buffers),
+                                    sizeof(extra_hdr.hdr.num_buffers));
             }
 
             receive_header(n, sg, elem->in_num, buf, size);
             if (n->rss_data.populate_hash) {
-                offset = sizeof(mhdr);
+                offset = offsetof(typeof(extra_hdr), hash_value);
                 iov_from_buf(sg, elem->in_num, offset,
-                             buf + offset, n->host_hdr_len - sizeof(mhdr));
+                             (char *)&extra_hdr + offset,
+                             sizeof(extra_hdr.hash_value) +
+                             sizeof(extra_hdr.hash_report));
             }
             offset = n->host_hdr_len;
             total += n->guest_hdr_len;
@@ -2006,10 +2003,11 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
     }
 
     if (mhdr_cnt) {
-        virtio_stw_p(vdev, &mhdr.num_buffers, i);
+        virtio_stw_p(vdev, &extra_hdr.hdr.num_buffers, i);
         iov_from_buf(mhdr_sg, mhdr_cnt,
                      0,
-                     &mhdr.num_buffers, sizeof mhdr.num_buffers);
+                     &extra_hdr.hdr.num_buffers,
+                     sizeof extra_hdr.hdr.num_buffers);
     }
 
     for (j = 0; j < i; j++) {
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 15/20] ebpf: Fix RSS error handling
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (13 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 14/20] virtio-net: Do not write hashes to peer buffer Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 16/20] ebpf: Return 0 when configuration fails Jason Wang
                   ` (6 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

calculate_rss_hash() was using hash value 0 to tell if it calculated
a hash, but the hash value may be 0 on a rare occasion. Have a
distinct bool value for correctness.

Fixes: f3fa412de2 ("ebpf: Added eBPF RSS program.")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 ebpf/rss.bpf.skeleton.h | 1210 +++++++++++++++++++--------------------
 tools/ebpf/rss.bpf.c    |   20 +-
 2 files changed, 610 insertions(+), 620 deletions(-)

diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
index aed4ef9a03..e41ed88901 100644
--- a/ebpf/rss.bpf.skeleton.h
+++ b/ebpf/rss.bpf.skeleton.h
@@ -165,7 +165,7 @@ rss_bpf__create_skeleton(struct rss_bpf *obj)
 	s->progs[0].prog = &obj->progs.tun_rss_steering_prog;
 	s->progs[0].link = &obj->links.tun_rss_steering_prog;
 
-	s->data = (void *)rss_bpf__elf_bytes(&s->data_sz);
+	s->data = rss_bpf__elf_bytes(&s->data_sz);
 
 	obj->skeleton = s;
 	return 0;
@@ -176,194 +176,188 @@ err:
 
 static inline const void *rss_bpf__elf_bytes(size_t *sz)
 {
-	*sz = 20600;
-	return (const void *)"\
+	static const char data[] __attribute__((__aligned__(8))) = "\
 \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\x38\x4d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
-\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
-\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\xb8\x4b\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
+\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
+\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\
-\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x61\x02\0\0\0\0\xbf\x78\0\0\
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-\x58\x05\0\0\x58\x05\0\0\x85\x11\0\0\0\0\0\0\0\0\0\x02\x03\0\0\0\x01\0\0\0\0\0\
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 \0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x02\
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 \0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\x02\x08\0\0\
@@ -403,11 +397,11 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \0\0\0\0\x01\0\0\x05\x08\0\0\0\0\x02\0\0\x22\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x02\
 \x2d\0\0\0\x03\x02\0\0\0\0\0\x08\x24\0\0\0\x08\x02\0\0\0\0\0\x01\x01\0\0\0\x08\
 \0\0\0\0\0\0\0\x01\0\0\x0d\x02\0\0\0\x16\x02\0\0\x17\0\0\0\x1a\x02\0\0\x01\0\0\
-\x0c\x25\0\0\0\x52\x11\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\x01\0\0\0\0\0\0\0\x03\0\
-\0\0\0\x27\0\0\0\x04\0\0\0\x07\0\0\0\x57\x11\0\0\0\0\0\x0e\x28\0\0\0\x01\0\0\0\
-\x60\x11\0\0\x03\0\0\x0f\0\0\0\0\x0e\0\0\0\0\0\0\0\x28\0\0\0\x12\0\0\0\0\0\0\0\
-\x28\0\0\0\x16\0\0\0\0\0\0\0\x28\0\0\0\x66\x11\0\0\x01\0\0\x0f\0\0\0\0\x29\0\0\
-\0\0\0\0\0\x07\0\0\0\x6e\x11\0\0\0\0\0\x07\0\0\0\0\x7c\x11\0\0\0\0\0\x07\0\0\0\
+\x0c\x25\0\0\0\x3e\x11\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\x01\0\0\0\0\0\0\0\x03\0\
+\0\0\0\x27\0\0\0\x04\0\0\0\x07\0\0\0\x43\x11\0\0\0\0\0\x0e\x28\0\0\0\x01\0\0\0\
+\x4c\x11\0\0\x03\0\0\x0f\0\0\0\0\x0e\0\0\0\0\0\0\0\x28\0\0\0\x12\0\0\0\0\0\0\0\
+\x28\0\0\0\x16\0\0\0\0\0\0\0\x28\0\0\0\x52\x11\0\0\x01\0\0\x0f\0\0\0\0\x29\0\0\
+\0\0\0\0\0\x07\0\0\0\x5a\x11\0\0\0\0\0\x07\0\0\0\0\x68\x11\0\0\0\0\0\x07\0\0\0\
 \0\0\x69\x6e\x74\0\x5f\x5f\x41\x52\x52\x41\x59\x5f\x53\x49\x5a\x45\x5f\x54\x59\
 \x50\x45\x5f\x5f\0\x74\x79\x70\x65\0\x6b\x65\x79\x5f\x73\x69\x7a\x65\0\x76\x61\
 \x6c\x75\x65\x5f\x73\x69\x7a\x65\0\x6d\x61\x78\x5f\x65\x6e\x74\x72\x69\x65\x73\
@@ -436,7 +430,7 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \x67\x20\x6c\x6f\x6e\x67\0\x73\x6b\0\x5f\x5f\x75\x38\0\x75\x6e\x73\x69\x67\x6e\
 \x65\x64\x20\x63\x68\x61\x72\0\x73\x6b\x62\0\x74\x75\x6e\x5f\x72\x73\x73\x5f\
 \x73\x74\x65\x65\x72\x69\x6e\x67\x5f\x70\x72\x6f\x67\0\x73\x6f\x63\x6b\x65\x74\
-\0\x2f\x68\x6f\x6d\x65\x2f\x61\x6e\x64\x2f\x53\x52\x43\x53\x2f\x71\x65\x6d\x75\
+\0\x2f\x68\x6f\x6d\x65\x2f\x6d\x65\x2f\x71\x2f\x76\x61\x72\x2f\x71\x65\x6d\x75\
 \x2f\x74\x6f\x6f\x6c\x73\x2f\x65\x62\x70\x66\x2f\x72\x73\x73\x2e\x62\x70\x66\
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 \x69\x6e\x67\x5f\x70\x72\x6f\x67\x28\x73\x74\x72\x75\x63\x74\x20\x5f\x5f\x73\
@@ -489,125 +483,125 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \x20\x20\x6c\x34\x5f\x70\x72\x6f\x74\x6f\x63\x6f\x6c\x20\x3d\x20\x69\x70\x2e\
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 \x5f\x6f\x66\x66\x73\x65\x74\x20\x3d\x20\x69\x70\x2e\x69\x68\x6c\x20\x2a\x20\
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+\x65\x20\x69\x66\x20\x28\x70\x61\x63\x6b\x65\x74\x5f\x69\x6e\x66\x6f\x2e\x69\
+\x73\x5f\x75\x64\x70\x20\x26\x26\0\x20\x20\x20\x20\x20\x20\x20\x20\x7d\x20\x65\
+\x6c\x73\x65\x20\x69\x66\x20\x28\x63\x6f\x6e\x66\x69\x67\x2d\x3e\x68\x61\x73\
+\x68\x5f\x74\x79\x70\x65\x73\x20\x26\x20\x56\x49\x52\x54\x49\x4f\x5f\x4e\x45\
+\x54\x5f\x52\x53\x53\x5f\x48\x41\x53\x48\x5f\x54\x59\x50\x45\x5f\x49\x50\x76\
+\x34\x29\x20\x7b\0\x20\x20\x20\x20\x20\x20\x20\x20\x7d\x20\x65\x6c\x73\x65\x20\
+\x69\x66\x20\x28\x63\x6f\x6e\x66\x69\x67\x2d\x3e\x68\x61\x73\x68\x5f\x74\x79\
+\x70\x65\x73\x20\x26\x20\x56\x49\x52\x54\x49\x4f\x5f\x4e\x45\x54\x5f\x52\x53\
+\x53\x5f\x48\x41\x53\x48\x5f\x54\x59\x50\x45\x5f\x49\x50\x76\x36\x29\x20\x7b\0\
+\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x69\x6e\x66\x6f\x2d\x3e\x69\
+\x73\x5f\x75\x64\x70\x20\x3d\x20\x31\x3b\0\x20\x20\x20\x20\x20\x20\x20\x20\x20\
+\x20\x20\x20\x73\x74\x72\x75\x63\x74\x20\x75\x64\x70\x68\x64\x72\x20\x75\x64\
+\x70\x20\x3d\x20\x7b\x7d\x3b\0\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\
+\x65\x72\x72\x20\x3d\x20\x62\x70\x66\x5f\x73\x6b\x62\x5f\x6c\x6f\x61\x64\x5f\
+\x62\x79\x74\x65\x73\x5f\x72\x65\x6c\x61\x74\x69\x76\x65\x28\x73\x6b\x62\x2c\
+\x20\x6c\x34\x5f\x6f\x66\x66\x73\x65\x74\x2c\x20\x26\x75\x64\x70\x2c\x20\x73\
+\x69\x7a\x65\x6f\x66\x28\x75\x64\x70\x29\x2c\0\x20\x20\x20\x20\x66\x6f\x72\x20\
 \x28\x62\x79\x74\x65\x20\x3d\x20\x30\x3b\x20\x62\x79\x74\x65\x20\x3c\x20\x48\
 \x41\x53\x48\x5f\x43\x41\x4c\x43\x55\x4c\x41\x54\x49\x4f\x4e\x5f\x42\x55\x46\
 \x46\x45\x52\x5f\x53\x49\x5a\x45\x3b\x20\x62\x79\x74\x65\x2b\x2b\x29\x20\x7b\0\
@@ -624,8 +618,7 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \x20\x20\x20\x20\x28\x6c\x65\x66\x74\x6d\x6f\x73\x74\x5f\x33\x32\x5f\x62\x69\
 \x74\x73\x20\x3c\x3c\x20\x31\x29\x20\x7c\x20\x28\x28\x6b\x65\x79\x5f\x62\x79\
 \x74\x65\x20\x26\x20\x28\x31\x20\x3c\x3c\x20\x37\x29\x29\x20\x3e\x3e\x20\x37\
-\x29\x3b\0\x20\x20\x20\x20\x20\x20\x20\x20\x69\x66\x20\x28\x68\x61\x73\x68\x29\
-\x20\x7b\0\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x5f\x5f\x75\x33\x32\
+\x29\x3b\0\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x5f\x5f\x75\x33\x32\
 \x20\x74\x61\x62\x6c\x65\x5f\x69\x64\x78\x20\x3d\x20\x68\x61\x73\x68\x20\x25\
 \x20\x63\x6f\x6e\x66\x69\x67\x2d\x3e\x69\x6e\x64\x69\x72\x65\x63\x74\x69\x6f\
 \x6e\x73\x5f\x6c\x65\x6e\x3b\0\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\
@@ -638,15 +631,15 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \x3b\0\x63\x68\x61\x72\0\x5f\x6c\x69\x63\x65\x6e\x73\x65\0\x2e\x6d\x61\x70\x73\
 \0\x6c\x69\x63\x65\x6e\x73\x65\0\x62\x70\x66\x5f\x66\x6c\x6f\x77\x5f\x6b\x65\
 \x79\x73\0\x62\x70\x66\x5f\x73\x6f\x63\x6b\0\0\0\0\x9f\xeb\x01\0\x20\0\0\0\0\0\
-\0\0\x14\0\0\0\x14\0\0\0\xbc\x0c\0\0\xd0\x0c\0\0\0\0\0\0\x08\0\0\0\x30\x02\0\0\
-\x01\0\0\0\0\0\0\0\x26\0\0\0\x10\0\0\0\x30\x02\0\0\xcb\0\0\0\0\0\0\0\x37\x02\0\
-\0\x60\x02\0\0\0\x5c\x08\0\x10\0\0\0\x37\x02\0\0\x91\x02\0\0\x0b\x74\x08\0\x20\
-\0\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x28\0\0\0\x37\x02\0\0\xa4\x02\0\0\x0e\x80\
-\x08\0\x50\0\0\0\x37\x02\0\0\xe9\x02\0\0\x0b\x84\x08\0\x88\0\0\0\x37\x02\0\0\
-\x29\x03\0\0\x10\x8c\x08\0\x90\0\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x98\0\0\0\x37\
-\x02\0\0\x29\x03\0\0\x10\x8c\x08\0\xa0\0\0\0\x37\x02\0\0\x42\x03\0\0\x16\x90\
-\x08\0\xa8\0\0\0\x37\x02\0\0\x42\x03\0\0\x0d\x90\x08\0\xc0\0\0\0\x37\x02\0\0\
-\x63\x03\0\0\x0a\x08\x06\0\xe8\0\0\0\x37\x02\0\0\x9a\x03\0\0\x1f\x18\x06\0\x38\
+\0\0\x14\0\0\0\x14\0\0\0\x6c\x0c\0\0\x80\x0c\0\0\0\0\0\0\x08\0\0\0\x30\x02\0\0\
+\x01\0\0\0\0\0\0\0\x26\0\0\0\x10\0\0\0\x30\x02\0\0\xc6\0\0\0\0\0\0\0\x37\x02\0\
+\0\x60\x02\0\0\0\x68\x08\0\x10\0\0\0\x37\x02\0\0\x91\x02\0\0\x0b\x80\x08\0\x20\
+\0\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x28\0\0\0\x37\x02\0\0\xa4\x02\0\0\x0e\x8c\
+\x08\0\x50\0\0\0\x37\x02\0\0\xe9\x02\0\0\x0b\x90\x08\0\x88\0\0\0\x37\x02\0\0\
+\x29\x03\0\0\x10\x98\x08\0\x90\0\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x98\0\0\0\x37\
+\x02\0\0\x29\x03\0\0\x10\x98\x08\0\xa0\0\0\0\x37\x02\0\0\x42\x03\0\0\x16\x9c\
+\x08\0\xa8\0\0\0\x37\x02\0\0\x42\x03\0\0\x0d\x9c\x08\0\xc0\0\0\0\x37\x02\0\0\
+\x63\x03\0\0\x0a\x10\x06\0\xe8\0\0\0\x37\x02\0\0\x9a\x03\0\0\x1f\x1c\x06\0\x38\
 \x01\0\0\x37\x02\0\0\xca\x03\0\0\x0f\xac\x04\0\x40\x01\0\0\x37\x02\0\0\xe3\x03\
 \0\0\x0c\x2c\x04\0\x50\x01\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x58\x01\0\0\x37\x02\
 \0\0\xf7\x03\0\0\x0b\x38\x04\0\x80\x01\0\0\x37\x02\0\0\x3d\x04\0\0\x09\x40\x04\
@@ -666,313 +659,308 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \x37\x02\0\0\xde\x05\0\0\x1b\x08\x05\0\0\x03\0\0\x37\x02\0\0\xde\x05\0\0\x16\
 \x08\x05\0\x08\x03\0\0\x37\x02\0\0\xff\x05\0\0\x1a\x14\x05\0\x10\x03\0\0\x37\
 \x02\0\0\x22\x06\0\0\x18\x18\x05\0\x18\x03\0\0\x37\x02\0\0\x22\x06\0\0\x1c\x18\
-\x05\0\x30\x03\0\0\x37\x02\0\0\x6f\x05\0\0\x1d\x0c\x05\0\x38\x03\0\0\x37\x02\0\
-\0\x42\x06\0\0\x15\x74\x05\0\x48\x03\0\0\x37\x02\0\0\x42\x06\0\0\x1a\x74\x05\0\
-\x60\x03\0\0\x37\x02\0\0\x76\x06\0\0\x0d\x78\x05\0\x80\x03\0\0\x37\x02\0\0\xa0\
-\x06\0\0\x1a\x7c\x05\0\x90\x03\0\0\x37\x02\0\0\xbe\x06\0\0\x1b\x84\x05\0\xb0\
-\x03\0\0\x37\x02\0\0\xa0\x06\0\0\x1a\x7c\x05\0\xb8\x03\0\0\x37\x02\0\0\xe2\x06\
-\0\0\x13\x88\x05\0\xe0\x03\0\0\x37\x02\0\0\x33\x07\0\0\x11\x90\x05\0\xf0\x03\0\
-\0\x37\x02\0\0\x33\x07\0\0\x11\x90\x05\0\xf8\x03\0\0\x37\x02\0\0\0\0\0\0\0\0\0\
-\0\x18\x04\0\0\x37\x02\0\0\x4a\x07\0\0\x15\x34\x06\0\x20\x04\0\0\x37\x02\0\0\
-\x4a\x07\0\0\x09\x34\x06\0\x28\x04\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x78\x04\0\0\
-\x37\x02\0\0\x69\x07\0\0\x19\x38\x06\0\x80\x04\0\0\x37\x02\0\0\x69\x07\0\0\x20\
-\x38\x06\0\xa0\x04\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\xf0\x04\0\0\x37\x02\0\0\x8b\
-\x07\0\0\x17\x20\x05\0\0\x05\0\0\x37\x02\0\0\xa6\x07\0\0\x18\x28\x05\0\x30\x05\
-\0\0\x37\x02\0\0\x8b\x07\0\0\x17\x20\x05\0\x48\x05\0\0\x37\x02\0\0\xc7\x07\0\0\
-\x0f\x2c\x05\0\x70\x05\0\0\x37\x02\0\0\x5c\x05\0\0\x0d\x34\x05\0\x80\x05\0\0\
-\x37\x02\0\0\x5c\x05\0\0\x0d\x34\x05\0\x88\x05\0\0\x37\x02\0\0\x0c\x08\0\0\x1d\
-\x44\x05\0\xc8\x05\0\0\x37\x02\0\0\x2f\x08\0\0\x1d\x48\x05\0\x08\x06\0\0\x37\
-\x02\0\0\x52\x08\0\0\x1b\x50\x05\0\x10\x06\0\0\x37\x02\0\0\x75\x08\0\0\x05\x3c\
-\x02\0\x58\x06\0\0\x37\x02\0\0\x8d\x08\0\0\x19\xc4\x02\0\xc8\x06\0\0\x37\x02\0\
-\0\0\0\0\0\0\0\0\0\xd0\x06\0\0\x37\x02\0\0\xb3\x08\0\0\x0f\xd4\x02\0\xf8\x06\0\
-\0\x37\x02\0\0\x5c\x05\0\0\x0d\xdc\x02\0\x10\x07\0\0\x37\x02\0\0\x5c\x05\0\0\
-\x0d\xdc\x02\0\x18\x07\0\0\x37\x02\0\0\xf8\x08\0\0\x0d\xec\x02\0\x38\x07\0\0\
-\x37\x02\0\0\x27\x09\0\0\x20\xf0\x02\0\x60\x07\0\0\x37\x02\0\0\x53\x09\0\0\x13\
-\xf8\x02\0\x88\x07\0\0\x37\x02\0\0\x33\x07\0\0\x11\0\x03\0\xa0\x07\0\0\x37\x02\
-\0\0\x33\x07\0\0\x11\0\x03\0\xa8\x07\0\0\x37\x02\0\0\x9b\x09\0\0\x19\x10\x03\0\
-\xb0\x07\0\0\x37\x02\0\0\x9b\x09\0\0\x34\x10\x03\0\xd8\x07\0\0\x37\x02\0\0\xd1\
-\x09\0\0\x15\x24\x03\0\xe8\x07\0\0\x37\x02\0\0\x12\x0a\0\0\x17\x20\x03\0\x10\
-\x08\0\0\x37\x02\0\0\x49\x0a\0\0\x15\x30\x03\0\x28\x08\0\0\x37\x02\0\0\x49\x0a\
-\0\0\x15\x30\x03\0\x30\x08\0\0\x37\x02\0\0\x64\x0a\0\0\x27\x40\x03\0\x58\x08\0\
-\0\x37\x02\0\0\x8f\x0a\0\0\x27\x5c\x03\0\x68\x08\0\0\x37\x02\0\0\xbf\x0a\0\0\
-\x1c\xc0\x03\0\x70\x08\0\0\x37\x02\0\0\xfb\x0a\0\0\x20\xcc\x03\0\x80\x08\0\0\
-\x37\x02\0\0\xfb\x0a\0\0\x2f\xcc\x03\0\x88\x08\0\0\x37\x02\0\0\xfb\x0a\0\0\x36\
-\xcc\x03\0\x90\x08\0\0\x37\x02\0\0\xfb\x0a\0\0\x15\xcc\x03\0\xf8\x08\0\0\x37\
-\x02\0\0\x37\x0b\0\0\x43\x70\x03\0\x18\x09\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x20\
-\x09\0\0\x37\x02\0\0\x37\x0b\0\0\x17\x70\x03\0\x48\x09\0\0\x37\x02\0\0\x49\x0a\
-\0\0\x15\x78\x03\0\x60\x09\0\0\x37\x02\0\0\x49\x0a\0\0\x15\x78\x03\0\x68\x09\0\
-\0\x37\x02\0\0\x87\x0b\0\0\x19\x88\x03\0\x70\x09\0\0\x37\x02\0\0\x87\x0b\0\0\
-\x15\x88\x03\0\x78\x09\0\0\x37\x02\0\0\xb7\x0b\0\0\x19\x90\x03\0\x80\x09\0\0\
-\x37\x02\0\0\xe7\x0b\0\0\x1b\x8c\x03\0\xb0\x09\0\0\x37\x02\0\0\x22\x0c\0\0\x19\
-\xa0\x03\0\xc8\x09\0\0\x37\x02\0\0\x22\x0c\0\0\x19\xa0\x03\0\xd0\x09\0\0\x37\
-\x02\0\0\x41\x0c\0\0\x2b\xb0\x03\0\xf0\x09\0\0\x37\x02\0\0\xbf\x0a\0\0\x1f\xc0\
-\x03\0\x10\x0a\0\0\x37\x02\0\0\x70\x0c\0\0\x21\xe0\x03\0\x20\x0a\0\0\x37\x02\0\
-\0\x98\x0c\0\0\x20\xf0\x03\0\x28\x0a\0\0\x37\x02\0\0\x98\x0c\0\0\x2c\xf0\x03\0\
-\x40\x0a\0\0\x37\x02\0\0\x98\x0c\0\0\x14\xf0\x03\0\x50\x0a\0\0\x37\x02\0\0\xc8\
-\x0c\0\0\x20\xec\x03\0\x58\x0a\0\0\x37\x02\0\0\x75\x08\0\0\x05\x3c\x02\0\xa0\
-\x0a\0\0\x37\x02\0\0\xf0\x0c\0\0\x38\xcc\x02\0\xc0\x0a\0\0\x37\x02\0\0\xf0\x0c\
-\0\0\x05\xcc\x02\0\xd8\x0a\0\0\x37\x02\0\0\x75\x08\0\0\x05\x3c\x02\0\xe8\x0a\0\
-\0\x37\x02\0\0\x2e\x0d\0\0\x1c\xd0\x06\0\xf0\x0a\0\0\x37\x02\0\0\x2e\x0d\0\0\
-\x10\xd0\x06\0\xf8\x0a\0\0\x37\x02\0\0\0\0\0\0\0\0\0\0\x48\x0b\0\0\x37\x02\0\0\
-\x69\x07\0\0\x19\xd4\x06\0\x50\x0b\0\0\x37\x02\0\0\x69\x07\0\0\x20\xd4\x06\0\
-\x88\x0b\0\0\x37\x02\0\0\x54\x0d\0\0\x2d\x0c\x07\0\x98\x0b\0\0\x37\x02\0\0\x54\
-\x0d\0\0\x1d\x0c\x07\0\xa0\x0b\0\0\x37\x02\0\0\x54\x0d\0\0\x2d\x0c\x07\0\xb0\
-\x0b\0\0\x37\x02\0\0\x83\x0d\0\0\x2d\xe0\x06\0\xe0\x0b\0\0\x37\x02\0\0\x83\x0d\
-\0\0\x1d\xe0\x06\0\xf0\x0b\0\0\x37\x02\0\0\x83\x0d\0\0\x2d\xe0\x06\0\0\x0c\0\0\
-\x37\x02\0\0\0\0\0\0\0\0\0\0\xd0\x0c\0\0\x37\x02\0\0\xb2\x0d\0\0\x20\x74\x06\0\
-\xd8\x0c\0\0\x37\x02\0\0\xb2\x0d\0\0\x27\x74\x06\0\0\x0d\0\0\x37\x02\0\0\xdb\
-\x0d\0\0\x27\xb0\x06\0\x08\x0d\0\0\x37\x02\0\0\xdb\x0d\0\0\x14\xb0\x06\0\x10\
-\x0d\0\0\x37\x02\0\0\x24\x0e\0\0\x05\xa4\x01\0\x20\x0d\0\0\x37\x02\0\0\x24\x0e\
-\0\0\x05\xa4\x01\0\x50\x0d\0\0\x37\x02\0\0\x5c\x05\0\0\x0d\x60\x05\0\x60\x0d\0\
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+\x70\x0c\0\0\0\0\0\0\x0c\0\0\0\x09\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\
+\x6f\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x70\x49\0\0\0\0\0\
+\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xac\0\0\
+\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\x37\0\0\0\0\0\0\x28\x05\0\0\0\
+\0\0\0\x01\0\0\0\x32\0\0\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
+
+	*sz = sizeof(data) - 1;
+	return (const void *)data;
 }
 
 #ifdef __cplusplus
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index 9715d1170e..fa55e1fcb5 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -380,18 +380,19 @@ error:
     return err;
 }
 
-static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
-        struct rss_config_t *config, struct toeplitz_key_data_t *toe)
+static inline bool calculate_rss_hash(struct __sk_buff *skb,
+                                      struct rss_config_t *config,
+                                      struct toeplitz_key_data_t *toe,
+                                      __u32 *result)
 {
     __u8 rss_input[HASH_CALCULATION_BUFFER_SIZE] = {};
     size_t bytes_written = 0;
-    __u32 result = 0;
     int err = 0;
     struct packet_hash_info_t packet_info = {};
 
     err = parse_packet(skb, &packet_info);
     if (err) {
-        return 0;
+        return false;
     }
 
     if (packet_info.is_ipv4) {
@@ -524,11 +525,13 @@ static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
         }
     }
 
-    if (bytes_written) {
-        net_toeplitz_add(&result, rss_input, bytes_written, toe);
+    if (!bytes_written) {
+        return false;
     }
 
-    return result;
+    net_toeplitz_add(result, rss_input, bytes_written, toe);
+
+    return true;
 }
 
 SEC("socket")
@@ -549,8 +552,7 @@ int tun_rss_steering_prog(struct __sk_buff *skb)
             return config->default_queue;
         }
 
-        hash = calculate_rss_hash(skb, config, toe);
-        if (hash) {
+        if (calculate_rss_hash(skb, config, toe, &hash)) {
             __u32 table_idx = hash % config->indirections_len;
             __u16 *queue = 0;
 
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 16/20] ebpf: Return 0 when configuration fails
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (14 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 15/20] ebpf: Fix RSS error handling Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 17/20] ebpf: Refactor tun_rss_steering_prog() Jason Wang
                   ` (5 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

The kernel interprets the returned value as an unsigned 32-bit so -1
will mean queue 4294967295, which is awkward. Return 0 instead.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 ebpf/rss.bpf.skeleton.h | 1532 +++++++++++++++++++--------------------
 tools/ebpf/rss.bpf.c    |    2 +-
 2 files changed, 767 insertions(+), 767 deletions(-)

diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
index e41ed88901..647212e5dd 100644
--- a/ebpf/rss.bpf.skeleton.h
+++ b/ebpf/rss.bpf.skeleton.h
@@ -178,786 +178,786 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 {
 	static const char data[] __attribute__((__aligned__(8))) = "\
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+\x31\0\x4c\x42\x42\x30\x5f\x39\x30\0\x4c\x42\x42\x30\x5f\x38\x30\0\x4c\x42\x42\
+\x30\x5f\x35\x30\0\x4c\x42\x42\x30\x5f\x34\x30\0\x4c\x42\x42\x30\x5f\x32\x30\0\
+\x4c\x42\x42\x30\x5f\x31\x30\x30\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xa4\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\x75\x49\0\0\0\0\0\0\x41\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\x1a\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\x31\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\
-\0\x20\x13\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x2d\0\
-\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x90\x3c\0\0\0\0\0\0\x30\0\0\0\
-\0\0\0\0\x0c\0\0\0\x03\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x38\0\0\0\x01\
-\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x60\x13\0\0\0\0\0\0\x78\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x7e\0\0\0\x01\0\0\0\x03\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\xd8\x13\0\0\0\0\0\0\x07\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb8\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\0\0\0\xe0\x13\0\0\0\0\0\0\xe1\x16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\xb4\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\xc0\x3c\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\x0c\0\0\0\x07\0\0\0\x08\0\0\0\0\0\0\0\
-\x10\0\0\0\0\0\0\0\x24\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xc4\x2a\
-\0\0\0\0\0\0\xa0\x0c\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\
-\0\0\x20\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x3d\0\0\0\0\0\0\
-\x70\x0c\0\0\0\0\0\0\x0c\0\0\0\x09\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\
-\x6f\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x70\x49\0\0\0\0\0\
-\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xac\0\0\
-\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x68\x37\0\0\0\0\0\0\x28\x05\0\0\0\
-\0\0\0\x01\0\0\0\x32\0\0\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
+\0\0\0\0\0\xa4\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x6d\x49\0\0\0\0\
+\0\0\x41\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x1a\
+\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x31\0\0\0\x01\0\0\0\
+\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\x18\x13\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x2d\0\0\0\x09\0\0\0\x40\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\x88\x3c\0\0\0\0\0\0\x30\0\0\0\0\0\0\0\x0c\0\0\0\x03\0\0\0\
+\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x38\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\x58\x13\0\0\0\0\0\0\x78\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x7e\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\xd0\x13\0\0\0\0\0\0\x07\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\xb8\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xd8\x13\0\0\0\0\
+\0\0\xe1\x16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb4\
+\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb8\x3c\0\0\0\0\0\0\x40\0\0\
+\0\0\0\0\0\x0c\0\0\0\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x24\0\0\0\
+\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xbc\x2a\0\0\0\0\0\0\xa0\x0c\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x20\0\0\0\x09\0\0\0\x40\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xf8\x3c\0\0\0\0\0\0\x70\x0c\0\0\0\0\0\0\x0c\0\0\
+\0\x09\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x6f\0\0\0\x03\x4c\xff\x6f\0\0\
+\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x68\x49\0\0\0\0\0\0\x05\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xac\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\x60\x37\0\0\0\0\0\0\x28\x05\0\0\0\0\0\0\x01\0\0\0\x32\0\0\0\x08\
+\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
 
 	*sz = sizeof(data) - 1;
 	return (const void *)data;
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index fa55e1fcb5..77434435ac 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -567,7 +567,7 @@ int tun_rss_steering_prog(struct __sk_buff *skb)
         return config->default_queue;
     }
 
-    return -1;
+    return 0;
 }
 
 char _license[] SEC("license") = "GPL v2";
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 17/20] ebpf: Refactor tun_rss_steering_prog()
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (15 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 16/20] ebpf: Return 0 when configuration fails Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 18/20] ebpf: Add a separate target for skeleton Jason Wang
                   ` (4 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

This saves branches and makes later BPF program changes easier.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 tools/ebpf/rss.bpf.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index 77434435ac..c989cb3cd8 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -547,27 +547,23 @@ int tun_rss_steering_prog(struct __sk_buff *skb)
     config = bpf_map_lookup_elem(&tap_rss_map_configurations, &key);
     toe = bpf_map_lookup_elem(&tap_rss_map_toeplitz_key, &key);
 
-    if (config && toe) {
-        if (!config->redirect) {
-            return config->default_queue;
-        }
+    if (!config || !toe) {
+        return 0;
+    }
 
-        if (calculate_rss_hash(skb, config, toe, &hash)) {
-            __u32 table_idx = hash % config->indirections_len;
-            __u16 *queue = 0;
+    if (config->redirect && calculate_rss_hash(skb, config, toe, &hash)) {
+        __u32 table_idx = hash % config->indirections_len;
+        __u16 *queue = 0;
 
-            queue = bpf_map_lookup_elem(&tap_rss_map_indirection_table,
-                                        &table_idx);
+        queue = bpf_map_lookup_elem(&tap_rss_map_indirection_table,
+                                    &table_idx);
 
-            if (queue) {
-                return *queue;
-            }
+        if (queue) {
+            return *queue;
         }
-
-        return config->default_queue;
     }
 
-    return 0;
+    return config->default_queue;
 }
 
 char _license[] SEC("license") = "GPL v2";
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 18/20] ebpf: Add a separate target for skeleton
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (16 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 17/20] ebpf: Refactor tun_rss_steering_prog() Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 19/20] virtio-net: drop too short packets early Jason Wang
                   ` (3 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Akihiko Odaki, Jason Wang

From: Akihiko Odaki <akihiko.odaki@daynix.com>

This generalizes the rule to generate the skeleton and allows to add
another.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 tools/ebpf/Makefile.ebpf | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/tools/ebpf/Makefile.ebpf b/tools/ebpf/Makefile.ebpf
index 3391e7ce08..572ca5987a 100755
--- a/tools/ebpf/Makefile.ebpf
+++ b/tools/ebpf/Makefile.ebpf
@@ -1,23 +1,24 @@
-OBJS = rss.bpf.o
+SKELETONS = rss.bpf.skeleton.h
 
 LLVM_STRIP ?= llvm-strip
 CLANG ?= clang
 INC_FLAGS = `$(CLANG) -print-file-name=include`
 EXTRA_CFLAGS ?= -O2 -g -target bpf
 
-all: $(OBJS)
+all: $(SKELETONS)
 
 .PHONY: clean
 
 clean:
-	rm -f $(OBJS)
-	rm -f rss.bpf.skeleton.h
+	rm -f $(SKELETONS) $(SKELETONS:%.skeleton.h=%.o)
 
-$(OBJS):  %.o:%.c
+%.o: %.c
 	$(CLANG) $(INC_FLAGS) \
                 -D__KERNEL__ -D__ASM_SYSREG_H \
                 -I../include $(LINUXINCLUDE) \
                 $(EXTRA_CFLAGS) -c $< -o $@
 	$(LLVM_STRIP) -g $@
-	bpftool gen skeleton rss.bpf.o > rss.bpf.skeleton.h
-	cp rss.bpf.skeleton.h ../../ebpf/
+
+%.skeleton.h: %.o
+	bpftool gen skeleton $< > $@
+	cp $@ ../../ebpf/
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 19/20] virtio-net: drop too short packets early
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (17 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 18/20] ebpf: Add a separate target for skeleton Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04  7:37 ` [PULL 20/20] ebpf: Added traces back. Changed source set for eBPF to 'system' Jason Wang
                   ` (2 subsequent siblings)
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Alexey Dobriyan, Jason Wang

From: Alexey Dobriyan <adobriyan@yandex-team.ru>

Reproducer from https://gitlab.com/qemu-project/qemu/-/issues/1451
creates small packet (1 segment, len = 10 == n->guest_hdr_len),
then destroys queue.

"if (n->host_hdr_len != n->guest_hdr_len)" is triggered, if body creates
zero length/zero segment packet as there is nothing after guest header.

qemu_sendv_packet_async() tries to send it.

slirp discards it because it is smaller than Ethernet header,
but returns 0 because tx hooks are supposed to return total length of data.

0 is propagated upwards and is interpreted as "packet has been sent"
which is terrible because queue is being destroyed, nobody is waiting for TX
to complete and assert it triggered.

Fix is discard such empty packets instead of sending them.

Length 1 packets will go via different codepath:

	virtqueue_push(q->tx_vq, elem, 0);
	virtio_notify(vdev, q->tx_vq);
	g_free(elem);

and aren't problematic.

Signed-off-by: Alexey Dobriyan <adobriyan@yandex-team.ru>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/virtio-net.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 666a4e2a03..9c7e85caea 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2708,18 +2708,14 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
         out_sg = elem->out_sg;
         if (out_num < 1) {
             virtio_error(vdev, "virtio-net header not in first element");
-            virtqueue_detach_element(q->tx_vq, elem, 0);
-            g_free(elem);
-            return -EINVAL;
+            goto detach;
         }
 
         if (n->needs_vnet_hdr_swap) {
             if (iov_to_buf(out_sg, out_num, 0, &vhdr, sizeof(vhdr)) <
                 sizeof(vhdr)) {
                 virtio_error(vdev, "virtio-net header incorrect");
-                virtqueue_detach_element(q->tx_vq, elem, 0);
-                g_free(elem);
-                return -EINVAL;
+                goto detach;
             }
             virtio_net_hdr_swap(vdev, &vhdr);
             sg2[0].iov_base = &vhdr;
@@ -2747,6 +2743,11 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
                              n->guest_hdr_len, -1);
             out_num = sg_num;
             out_sg = sg;
+
+            if (out_num < 1) {
+                virtio_error(vdev, "virtio-net nothing to send");
+                goto detach;
+            }
         }
 
         ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
@@ -2767,6 +2768,11 @@ drop:
         }
     }
     return num_packets;
+
+detach:
+    virtqueue_detach_element(q->tx_vq, elem, 0);
+    g_free(elem);
+    return -EINVAL;
 }
 
 static void virtio_net_tx_timer(void *opaque);
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* [PULL 20/20] ebpf: Added traces back. Changed source set for eBPF to 'system'.
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (18 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 19/20] virtio-net: drop too short packets early Jason Wang
@ 2024-06-04  7:37 ` Jason Wang
  2024-06-04 19:52 ` [PULL 00/20] Net patches Richard Henderson
  2024-06-05 10:14 ` Michael Tokarev
  21 siblings, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-04  7:37 UTC (permalink / raw)
  To: peter.maydell, qemu-devel; +Cc: Andrew Melnychenko, Jason Wang

From: Andrew Melnychenko <andrew@daynix.com>

There was an issue with Qemu build with "--disable-system".
The traces could be generated and the build fails.
The traces were 'cut out' for previous patches, and overall,
the 'system' source set should be used like in pre-'eBPF blob' patches.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 ebpf/ebpf_rss.c | 7 +++++++
 ebpf/trace.h    | 1 +
 2 files changed, 8 insertions(+)
 create mode 100644 ebpf/trace.h

diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index d102f3dd09..87f0714910 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -25,6 +25,8 @@
 #include "ebpf/rss.bpf.skeleton.h"
 #include "ebpf/ebpf.h"
 
+#include "trace.h"
+
 void ebpf_rss_init(struct EBPFRSSContext *ctx)
 {
     if (ctx != NULL) {
@@ -55,18 +57,21 @@ static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx)
                                    PROT_READ | PROT_WRITE, MAP_SHARED,
                                    ctx->map_configuration, 0);
     if (ctx->mmap_configuration == MAP_FAILED) {
+        trace_ebpf_error("eBPF RSS", "can not mmap eBPF configuration array");
         return false;
     }
     ctx->mmap_toeplitz_key = mmap(NULL, qemu_real_host_page_size(),
                                    PROT_READ | PROT_WRITE, MAP_SHARED,
                                    ctx->map_toeplitz_key, 0);
     if (ctx->mmap_toeplitz_key == MAP_FAILED) {
+        trace_ebpf_error("eBPF RSS", "can not mmap eBPF toeplitz key");
         goto toeplitz_fail;
     }
     ctx->mmap_indirections_table = mmap(NULL, qemu_real_host_page_size(),
                                    PROT_READ | PROT_WRITE, MAP_SHARED,
                                    ctx->map_indirections_table, 0);
     if (ctx->mmap_indirections_table == MAP_FAILED) {
+        trace_ebpf_error("eBPF RSS", "can not mmap eBPF indirection table");
         goto indirection_fail;
     }
 
@@ -108,12 +113,14 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
 
     rss_bpf_ctx = rss_bpf__open();
     if (rss_bpf_ctx == NULL) {
+        trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object");
         goto error;
     }
 
     bpf_program__set_type(rss_bpf_ctx->progs.tun_rss_steering_prog, BPF_PROG_TYPE_SOCKET_FILTER);
 
     if (rss_bpf__load(rss_bpf_ctx)) {
+        trace_ebpf_error("eBPF RSS", "can not load RSS program");
         goto error;
     }
 
diff --git a/ebpf/trace.h b/ebpf/trace.h
new file mode 100644
index 0000000000..abefc46ab1
--- /dev/null
+++ b/ebpf/trace.h
@@ -0,0 +1 @@
+#include "trace/trace-ebpf.h"
-- 
2.42.0



^ permalink raw reply related	[flat|nested] 42+ messages in thread

* Re: [PULL 00/20] Net patches
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (19 preceding siblings ...)
  2024-06-04  7:37 ` [PULL 20/20] ebpf: Added traces back. Changed source set for eBPF to 'system' Jason Wang
@ 2024-06-04 19:52 ` Richard Henderson
  2024-06-05 10:14 ` Michael Tokarev
  21 siblings, 0 replies; 42+ messages in thread
From: Richard Henderson @ 2024-06-04 19:52 UTC (permalink / raw)
  To: Jason Wang, peter.maydell, qemu-devel

On 6/4/24 02:37, Jason Wang wrote:
> The following changes since commit 3ab42e46acf867c45bc929fcc37693e327a35a24:
> 
>    Merge tag 'pull-ufs-20240603' ofhttps://gitlab.com/jeuk20.kim/qemu  into staging (2024-06-03 08:18:14 -0500)
> 
> are available in the Git repository at:
> 
>    https://github.com/jasowang/qemu.git  tags/net-pull-request
> 
> for you to fetch changes up to dcab53611191f50cf4feabc1d8794d04afe53407:
> 
>    ebpf: Added traces back. Changed source set for eBPF to 'system'. (2024-06-04 15:14:26 +0800)
> 
> -----------------------

Applied, thanks.  Please update https://wiki.qemu.org/ChangeLog/9.1 as appropriate.


r~



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 00/20] Net patches
  2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
                   ` (20 preceding siblings ...)
  2024-06-04 19:52 ` [PULL 00/20] Net patches Richard Henderson
@ 2024-06-05 10:14 ` Michael Tokarev
  2024-06-05 20:18   ` Akihiko Odaki
  2024-06-06  0:13   ` Jason Wang
  21 siblings, 2 replies; 42+ messages in thread
From: Michael Tokarev @ 2024-06-05 10:14 UTC (permalink / raw)
  To: Jason Wang, qemu-devel, Akihiko Odaki

04.06.2024 10:37, Jason Wang wrote:
> Akihiko Odaki (18):
>        tap: Remove tap_probe_vnet_hdr_len()
>        tap: Remove qemu_using_vnet_hdr()
>        net: Move virtio-net header length assertion
>        net: Remove receive_raw()
>        tap: Call tap_receive_iov() from tap_receive()
>        tap: Shrink zeroed virtio-net header
>        virtio-net: Do not propagate ebpf-rss-fds errors
>        virtio-net: Add only one queue pair when realizing
>        virtio-net: Copy header only when necessary
>        virtio-net: Shrink header byte swapping buffer
>        virtio-net: Disable RSS on reset
>        virtio-net: Unify the logic to update NIC state for RSS
>        virtio-net: Always set populate_hash
>        virtio-net: Do not write hashes to peer buffer
>        ebpf: Fix RSS error handling
>        ebpf: Return 0 when configuration fails
>        ebpf: Refactor tun_rss_steering_prog()
>        ebpf: Add a separate target for skeleton
> 
> Alexey Dobriyan (1):
>        virtio-net: drop too short packets early
> 
> Andrew Melnychenko (1):
>        ebpf: Added traces back. Changed source set for eBPF to 'system'.

Is there anything in there for qemu-stable?
(NOT picking up without explicit mention of stable)

Thanks,

/mjt
-- 
GPG Key transition (from rsa2048 to rsa4096) since 2024-04-24.
New key: rsa4096/61AD3D98ECDF2C8E  9D8B E14E 3F2A 9DD7 9199  28F1 61AD 3D98 ECDF 2C8E
Old key: rsa2048/457CE0A0804465C5  6EE1 95D1 886E 8FFB 810D  4324 457C E0A0 8044 65C5
Transition statement: http://www.corpit.ru/mjt/gpg-transition-2024.txt



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-04  7:37 ` [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors Jason Wang
@ 2024-06-05 10:23   ` Daniel P. Berrangé
  2024-06-05 20:14     ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Daniel P. Berrangé @ 2024-06-05 10:23 UTC (permalink / raw)
  To: Jason Wang; +Cc: peter.maydell, qemu-devel, Akihiko Odaki

On Tue, Jun 04, 2024 at 03:37:42PM +0800, Jason Wang wrote:
> From: Akihiko Odaki <akihiko.odaki@daynix.com>
> 
> Propagating ebpf-rss-fds errors has several problems.
> 
> First, it makes device realization fail and disables the fallback to the
> conventional eBPF loading.

AFAICT, this is not a bug - this is desired behaviour.

If the user/mgmt app has told QEMU to use FDs it has passed
in, then any failure to do this *MUST* be treated as a fatal
error. Falling back to other codepaths is ignoring a direct
user request.

> Second, it leaks memory by making device realization fail without
> freeing memory already allocated.
> 
> Third, the convention is to set an error when a function returns false,
> but virtio_net_load_ebpf_fds() and virtio_net_load_ebpf() returns false
> without setting an error, which is confusing.
> 
> Remove the propagation to fix these problems.

It doesn't fix the problems. It ignores the 2nd and 3rd problems
by removing the error reporting and ignoring the users' requested
config.

> 
> Fixes: 0524ea0510a3 ("ebpf: Added eBPF initialization by fds.")
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  hw/net/virtio-net.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index ff600b3002..3cee2ef3ac 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -1329,24 +1329,22 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
>      virtio_net_attach_ebpf_to_backend(n->nic, -1);
>  }
>  
> -static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
> +static bool virtio_net_load_ebpf_fds(VirtIONet *n)
>  {
>      int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
>      int ret = true;
>      int i = 0;
>  
> -    ERRP_GUARD();
> -
>      if (n->nr_ebpf_rss_fds != EBPF_RSS_MAX_FDS) {
> -        error_setg(errp,
> -                  "Expected %d file descriptors but got %d",
> -                  EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds);
> +        warn_report("Expected %d file descriptors but got %d",
> +                    EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds);
>         return false;
>     }
>  
>      for (i = 0; i < n->nr_ebpf_rss_fds; i++) {
> -        fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], errp);
> -        if (*errp) {
> +        fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i],
> +                                  &error_warn);
> +        if (fds[i] < 0) {
>              ret = false;
>              goto exit;
>          }
> @@ -1355,7 +1353,7 @@ static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
>      ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
>  
>  exit:
> -    if (!ret || *errp) {
> +    if (!ret) {
>          for (i = 0; i < n->nr_ebpf_rss_fds && fds[i] != -1; i++) {
>              close(fds[i]);
>          }
> @@ -1364,13 +1362,12 @@ exit:
>      return ret;
>  }
>  
> -static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
> +static bool virtio_net_load_ebpf(VirtIONet *n)
>  {
>      bool ret = false;
>  
>      if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
> -        if (!(n->ebpf_rss_fds
> -                && virtio_net_load_ebpf_fds(n, errp))) {
> +        if (!(n->ebpf_rss_fds && virtio_net_load_ebpf_fds(n))) {
>              ret = ebpf_rss_load(&n->ebpf_rss);
>          }
>      }
> @@ -3809,7 +3806,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
>      net_rx_pkt_init(&n->rx_pkt);
>  
>      if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
> -        virtio_net_load_ebpf(n, errp);
> +        virtio_net_load_ebpf(n);
>      }
>  }
>  
> -- 
> 2.42.0
> 
> 

With regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-05 10:23   ` Daniel P. Berrangé
@ 2024-06-05 20:14     ` Akihiko Odaki
  2024-06-06  7:14       ` Daniel P. Berrangé
  0 siblings, 1 reply; 42+ messages in thread
From: Akihiko Odaki @ 2024-06-05 20:14 UTC (permalink / raw)
  To: Daniel P. Berrangé, Jason Wang; +Cc: peter.maydell, qemu-devel

On 2024/06/05 19:23, Daniel P. Berrangé wrote:
> On Tue, Jun 04, 2024 at 03:37:42PM +0800, Jason Wang wrote:
>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>
>> Propagating ebpf-rss-fds errors has several problems.
>>
>> First, it makes device realization fail and disables the fallback to the
>> conventional eBPF loading.
> 
> AFAICT, this is not a bug - this is desired behaviour.
> 
> If the user/mgmt app has told QEMU to use FDs it has passed
> in, then any failure to do this *MUST* be treated as a fatal
> error. Falling back to other codepaths is ignoring a direct
> user request.

The FD options are more like an assistance rather than a request. When 
QEMU does not have a permission to load eBPF programs, a user can get 
the eBPF programs with the request-ebpf command of QMP, load it, and 
pass the FDs to QEMU.

A user must not to use the option to pass eBPF programs not included in 
QEMU since we don't have a stable ABI. Nobody should want to do that 
anyway since the function of the eBPF program is restricted with the 
virtio spec.

Regards,
Akihiko Odaki


^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 00/20] Net patches
  2024-06-05 10:14 ` Michael Tokarev
@ 2024-06-05 20:18   ` Akihiko Odaki
  2024-06-06  0:13   ` Jason Wang
  1 sibling, 0 replies; 42+ messages in thread
From: Akihiko Odaki @ 2024-06-05 20:18 UTC (permalink / raw)
  To: Michael Tokarev, Jason Wang, qemu-devel

On 2024/06/05 19:14, Michael Tokarev wrote:
> 04.06.2024 10:37, Jason Wang wrote:
>> Akihiko Odaki (18):
>>        tap: Remove tap_probe_vnet_hdr_len()
>>        tap: Remove qemu_using_vnet_hdr()
>>        net: Move virtio-net header length assertion
>>        net: Remove receive_raw()
>>        tap: Call tap_receive_iov() from tap_receive()
>>        tap: Shrink zeroed virtio-net header
>>        virtio-net: Do not propagate ebpf-rss-fds errors
>>        virtio-net: Add only one queue pair when realizing
>>        virtio-net: Copy header only when necessary
>>        virtio-net: Shrink header byte swapping buffer
>>        virtio-net: Disable RSS on reset
>>        virtio-net: Unify the logic to update NIC state for RSS
>>        virtio-net: Always set populate_hash
>>        virtio-net: Do not write hashes to peer buffer
>>        ebpf: Fix RSS error handling
>>        ebpf: Return 0 when configuration fails
>>        ebpf: Refactor tun_rss_steering_prog()
>>        ebpf: Add a separate target for skeleton
>>
>> Alexey Dobriyan (1):
>>        virtio-net: drop too short packets early
>>
>> Andrew Melnychenko (1):
>>        ebpf: Added traces back. Changed source set for eBPF to 'system'.
> 
> Is there anything in there for qemu-stable?
> (NOT picking up without explicit mention of stable)

No for my patches. Some fixes bugs but they are pretty minor and not 
problems in practice.

Regards,
Akihiko Odaki


^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 00/20] Net patches
  2024-06-05 10:14 ` Michael Tokarev
  2024-06-05 20:18   ` Akihiko Odaki
@ 2024-06-06  0:13   ` Jason Wang
  1 sibling, 0 replies; 42+ messages in thread
From: Jason Wang @ 2024-06-06  0:13 UTC (permalink / raw)
  To: Michael Tokarev; +Cc: qemu-devel, Akihiko Odaki

On Wed, Jun 5, 2024 at 6:14 PM Michael Tokarev <mjt@tls.msk.ru> wrote:
>
> 04.06.2024 10:37, Jason Wang wrote:
> > Akihiko Odaki (18):
> >        tap: Remove tap_probe_vnet_hdr_len()
> >        tap: Remove qemu_using_vnet_hdr()
> >        net: Move virtio-net header length assertion
> >        net: Remove receive_raw()
> >        tap: Call tap_receive_iov() from tap_receive()
> >        tap: Shrink zeroed virtio-net header
> >        virtio-net: Do not propagate ebpf-rss-fds errors
> >        virtio-net: Add only one queue pair when realizing
> >        virtio-net: Copy header only when necessary
> >        virtio-net: Shrink header byte swapping buffer
> >        virtio-net: Disable RSS on reset
> >        virtio-net: Unify the logic to update NIC state for RSS
> >        virtio-net: Always set populate_hash
> >        virtio-net: Do not write hashes to peer buffer
> >        ebpf: Fix RSS error handling
> >        ebpf: Return 0 when configuration fails
> >        ebpf: Refactor tun_rss_steering_prog()
> >        ebpf: Add a separate target for skeleton
> >
> > Alexey Dobriyan (1):
> >        virtio-net: drop too short packets early
> >
> > Andrew Melnychenko (1):
> >        ebpf: Added traces back. Changed source set for eBPF to 'system'.
>
> Is there anything in there for qemu-stable?
> (NOT picking up without explicit mention of stable)

One candidate might be "virtio-net: drop too short packets early".

Thanks

>
> Thanks,
>
> /mjt
> --
> GPG Key transition (from rsa2048 to rsa4096) since 2024-04-24.
> New key: rsa4096/61AD3D98ECDF2C8E  9D8B E14E 3F2A 9DD7 9199  28F1 61AD 3D98 ECDF 2C8E
> Old key: rsa2048/457CE0A0804465C5  6EE1 95D1 886E 8FFB 810D  4324 457C E0A0 8044 65C5
> Transition statement: http://www.corpit.ru/mjt/gpg-transition-2024.txt
>



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-05 20:14     ` Akihiko Odaki
@ 2024-06-06  7:14       ` Daniel P. Berrangé
  2024-06-06  7:19         ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Daniel P. Berrangé @ 2024-06-06  7:14 UTC (permalink / raw)
  To: Akihiko Odaki; +Cc: Jason Wang, peter.maydell, qemu-devel

On Thu, Jun 06, 2024 at 05:14:20AM +0900, Akihiko Odaki wrote:
> On 2024/06/05 19:23, Daniel P. Berrangé wrote:
> > On Tue, Jun 04, 2024 at 03:37:42PM +0800, Jason Wang wrote:
> > > From: Akihiko Odaki <akihiko.odaki@daynix.com>
> > > 
> > > Propagating ebpf-rss-fds errors has several problems.
> > > 
> > > First, it makes device realization fail and disables the fallback to the
> > > conventional eBPF loading.
> > 
> > AFAICT, this is not a bug - this is desired behaviour.
> > 
> > If the user/mgmt app has told QEMU to use FDs it has passed
> > in, then any failure to do this *MUST* be treated as a fatal
> > error. Falling back to other codepaths is ignoring a direct
> > user request.
> 
> The FD options are more like an assistance rather than a request. When QEMU
> does not have a permission to load eBPF programs, a user can get the eBPF
> programs with the request-ebpf command of QMP, load it, and pass the FDs to
> QEMU.

That still doesn't alter the fact that if the user has chosen to pass FDs
and QEMU fails to use them, it *MUST* report that error back to the user.

With regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-06  7:14       ` Daniel P. Berrangé
@ 2024-06-06  7:19         ` Akihiko Odaki
  2024-06-06  7:59           ` Daniel P. Berrangé
  0 siblings, 1 reply; 42+ messages in thread
From: Akihiko Odaki @ 2024-06-06  7:19 UTC (permalink / raw)
  To: Daniel P. Berrangé; +Cc: Jason Wang, peter.maydell, qemu-devel

On 2024/06/06 16:14, Daniel P. Berrangé wrote:
> On Thu, Jun 06, 2024 at 05:14:20AM +0900, Akihiko Odaki wrote:
>> On 2024/06/05 19:23, Daniel P. Berrangé wrote:
>>> On Tue, Jun 04, 2024 at 03:37:42PM +0800, Jason Wang wrote:
>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>
>>>> Propagating ebpf-rss-fds errors has several problems.
>>>>
>>>> First, it makes device realization fail and disables the fallback to the
>>>> conventional eBPF loading.
>>>
>>> AFAICT, this is not a bug - this is desired behaviour.
>>>
>>> If the user/mgmt app has told QEMU to use FDs it has passed
>>> in, then any failure to do this *MUST* be treated as a fatal
>>> error. Falling back to other codepaths is ignoring a direct
>>> user request.
>>
>> The FD options are more like an assistance rather than a request. When QEMU
>> does not have a permission to load eBPF programs, a user can get the eBPF
>> programs with the request-ebpf command of QMP, load it, and pass the FDs to
>> QEMU.
> 
> That still doesn't alter the fact that if the user has chosen to pass FDs
> and QEMU fails to use them, it *MUST* report that error back to the user.

The user should be more interested in whether the eBPF functionality is 
successfully enabled or not, and that is irrelevant from whether the 
eBPF program is loaded by QEMU or someone else. It is being worked on 
with another patch series:
https://patchew.org/QEMU/20240428-auto-v1-0-7b012216a120@daynix.com/

Regards,
Akihiko Odaki


^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-06  7:19         ` Akihiko Odaki
@ 2024-06-06  7:59           ` Daniel P. Berrangé
  2024-06-07  6:04             ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Daniel P. Berrangé @ 2024-06-06  7:59 UTC (permalink / raw)
  To: Akihiko Odaki; +Cc: Jason Wang, peter.maydell, qemu-devel

On Thu, Jun 06, 2024 at 04:19:11PM +0900, Akihiko Odaki wrote:
> On 2024/06/06 16:14, Daniel P. Berrangé wrote:
> > On Thu, Jun 06, 2024 at 05:14:20AM +0900, Akihiko Odaki wrote:
> > > On 2024/06/05 19:23, Daniel P. Berrangé wrote:
> > > > On Tue, Jun 04, 2024 at 03:37:42PM +0800, Jason Wang wrote:
> > > > > From: Akihiko Odaki <akihiko.odaki@daynix.com>
> > > > > 
> > > > > Propagating ebpf-rss-fds errors has several problems.
> > > > > 
> > > > > First, it makes device realization fail and disables the fallback to the
> > > > > conventional eBPF loading.
> > > > 
> > > > AFAICT, this is not a bug - this is desired behaviour.
> > > > 
> > > > If the user/mgmt app has told QEMU to use FDs it has passed
> > > > in, then any failure to do this *MUST* be treated as a fatal
> > > > error. Falling back to other codepaths is ignoring a direct
> > > > user request.
> > > 
> > > The FD options are more like an assistance rather than a request. When QEMU
> > > does not have a permission to load eBPF programs, a user can get the eBPF
> > > programs with the request-ebpf command of QMP, load it, and pass the FDs to
> > > QEMU.
> > 
> > That still doesn't alter the fact that if the user has chosen to pass FDs
> > and QEMU fails to use them, it *MUST* report that error back to the user.
> 
> The user should be more interested in whether the eBPF functionality is
> successfully enabled or not, and that is irrelevant from whether the eBPF
> program is loaded by QEMU or someone else.

No, this is wrong. A mgmt application or user will have made a decision
about *how* it wants QEMU to configure a particular feature. QEMU must
always honour the mgmt application's request, and not try to do something
different.

If the mgmt app did not want the FDs to be used, it would not have
passed them to QEMU in the first place. Ignoring the FDs is not likely
to work, because QEMU is unlikely to have permission to open the FDs
itself.

Ignoring the errors when creating the FDs, makes it much much harder
to detect and diagnose deployment problems, because the root cause
error is being discarded, and replaced by a later error which misleads
the app managing QEMU.

Always honouring the user requested config, or giving an error back
when it fails, is standard QEMU practice.

With regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors
  2024-06-06  7:59           ` Daniel P. Berrangé
@ 2024-06-07  6:04             ` Akihiko Odaki
  0 siblings, 0 replies; 42+ messages in thread
From: Akihiko Odaki @ 2024-06-07  6:04 UTC (permalink / raw)
  To: Daniel P. Berrangé; +Cc: Jason Wang, peter.maydell, qemu-devel

On 2024/06/06 16:59, Daniel P. Berrangé wrote:
> On Thu, Jun 06, 2024 at 04:19:11PM +0900, Akihiko Odaki wrote:
>> On 2024/06/06 16:14, Daniel P. Berrangé wrote:
>>> On Thu, Jun 06, 2024 at 05:14:20AM +0900, Akihiko Odaki wrote:
>>>> On 2024/06/05 19:23, Daniel P. Berrangé wrote:
>>>>> On Tue, Jun 04, 2024 at 03:37:42PM +0800, Jason Wang wrote:
>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>
>>>>>> Propagating ebpf-rss-fds errors has several problems.
>>>>>>
>>>>>> First, it makes device realization fail and disables the fallback to the
>>>>>> conventional eBPF loading.
>>>>>
>>>>> AFAICT, this is not a bug - this is desired behaviour.
>>>>>
>>>>> If the user/mgmt app has told QEMU to use FDs it has passed
>>>>> in, then any failure to do this *MUST* be treated as a fatal
>>>>> error. Falling back to other codepaths is ignoring a direct
>>>>> user request.
>>>>
>>>> The FD options are more like an assistance rather than a request. When QEMU
>>>> does not have a permission to load eBPF programs, a user can get the eBPF
>>>> programs with the request-ebpf command of QMP, load it, and pass the FDs to
>>>> QEMU.
>>>
>>> That still doesn't alter the fact that if the user has chosen to pass FDs
>>> and QEMU fails to use them, it *MUST* report that error back to the user.
>>
>> The user should be more interested in whether the eBPF functionality is
>> successfully enabled or not, and that is irrelevant from whether the eBPF
>> program is loaded by QEMU or someone else.
> 
> No, this is wrong. A mgmt application or user will have made a decision
> about *how* it wants QEMU to configure a particular feature. QEMU must
> always honour the mgmt application's request, and not try to do something
> different.
> 
> If the mgmt app did not want the FDs to be used, it would not have
> passed them to QEMU in the first place. Ignoring the FDs is not likely
> to work, because QEMU is unlikely to have permission to open the FDs
> itself.
> 
> Ignoring the errors when creating the FDs, makes it much much harder
> to detect and diagnose deployment problems, because the root cause
> error is being discarded, and replaced by a later error which misleads
> the app managing QEMU.
> 
> Always honouring the user requested config, or giving an error back
> when it fails, is standard QEMU practice.

I see.

I'll append a follow-up patch to the series "[PATCH 0/3] virtio-net: 
Convert feature properties to OnOffAuto" to remove the fallback path. We 
can keep this for now to remove the flawed error handling code.

Regards,
Akihiko Odaki


^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-06-04  7:37 ` [PULL 08/20] virtio-net: Add only one queue pair when realizing Jason Wang
@ 2024-10-14  8:30   ` Laurent Vivier
  2024-10-14 15:16     ` Laurent Vivier
  0 siblings, 1 reply; 42+ messages in thread
From: Laurent Vivier @ 2024-10-14  8:30 UTC (permalink / raw)
  To: Akihiko Odaki; +Cc: Jason Wang, qemu-devel

Hi Akihiko,

On 04/06/2024 09:37, Jason Wang wrote:
> From: Akihiko Odaki <akihiko.odaki@daynix.com>
> 
> Multiqueue usage is not negotiated yet when realizing. If more than
> one queue is added and the guest never requests to enable multiqueue,
> the extra queues will not be deleted when unrealizing and leak.
> 
> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest doesn't support multiqueue")
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>   hw/net/virtio-net.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 3cee2ef3ac..a8db8bfd9c 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -3743,9 +3743,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
>       n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
>                                       n->net_conf.tx_queue_size);
>   
> -    for (i = 0; i < n->max_queue_pairs; i++) {
> -        virtio_net_add_queue(n, i);
> -    }
> +    virtio_net_add_queue(n, 0);
>   
>       n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
>       qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);

This change breaks virtio net migration when multiqueue is enabled.

I think this is because virtqueues are half initialized after migration : they are 
initialized on guest side (kernel is using them) but not on QEMU side (realized has only 
initialized one). After migration, they are not initialized by the call to 
virtio_net_set_multiqueue() from virtio_net_set_features() because virtio_get_num_queues() 
reports already n->max_queue_pairs as this value is coming from the source guest memory.

I don't think we have a way to half-initialize a virtqueue (to initialize them only on 
QEMU side as they are already initialized on kernel side).

I think this change should be reverted to fix the migration issue.

How to reproduce the problem:

Source:

qemu-system-x86_64 -serial mon:stdio -accel kvm -cpu host -m 2G -display none -hda 
vm3.qcow2 -netdev tap,vhost=false,queues=2,id=hostnet0,script=/etc/qemu-ifup -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:49:47:db,mq=true

Destination:

qemu-system-x86_64 -serial mon:stdio -accel kvm -cpu host -m 2G -display none -hda 
vm3.qcow2 -netdev tap,vhost=false,queues=2,id=hostnet0,script=/etc/qemu-ifup -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:49:47:db,mq=true -incoming 
tcp:localhost:4444

In monitor:

migrate tcp:localhost:4444

Result on destination side:

(hangs and then: )
[   44.175916] watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [kworker/0:0:8]
...
I think we have this error because the control virqueue is #3 for QEMU, whereas the kernel 
is using a control virqueue set by the multiqueue (max_queue_pairs * 2 + 1). There is a 
mismatch between queues...

Thanks,
Laurent



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-14  8:30   ` Laurent Vivier
@ 2024-10-14 15:16     ` Laurent Vivier
  2024-10-17  6:59       ` Jason Wang
  0 siblings, 1 reply; 42+ messages in thread
From: Laurent Vivier @ 2024-10-14 15:16 UTC (permalink / raw)
  To: Akihiko Odaki; +Cc: Jason Wang, qemu-devel

On 14/10/2024 10:30, Laurent Vivier wrote:
> Hi Akihiko,
> 
> On 04/06/2024 09:37, Jason Wang wrote:
>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>
>> Multiqueue usage is not negotiated yet when realizing. If more than
>> one queue is added and the guest never requests to enable multiqueue,
>> the extra queues will not be deleted when unrealizing and leak.
>>
>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest doesn't support 
>> multiqueue")
>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   hw/net/virtio-net.c | 4 +---
>>   1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>> index 3cee2ef3ac..a8db8bfd9c 100644
>> --- a/hw/net/virtio-net.c
>> +++ b/hw/net/virtio-net.c
>> @@ -3743,9 +3743,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
>>       n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
>>                                       n->net_conf.tx_queue_size);
>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>> -        virtio_net_add_queue(n, i);
>> -    }
>> +    virtio_net_add_queue(n, 0);
>>       n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
>>       qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
> 
> This change breaks virtio net migration when multiqueue is enabled.
> 
> I think this is because virtqueues are half initialized after migration : they are 
> initialized on guest side (kernel is using them) but not on QEMU side (realized has only 
> initialized one). After migration, they are not initialized by the call to 
> virtio_net_set_multiqueue() from virtio_net_set_features() because virtio_get_num_queues() 
> reports already n->max_queue_pairs as this value is coming from the source guest memory.
> 
> I don't think we have a way to half-initialize a virtqueue (to initialize them only on 
> QEMU side as they are already initialized on kernel side).
> 
> I think this change should be reverted to fix the migration issue.
> 

Moreover, if I look in the code of virtio_load() and virtio_add_queue() we can guess it's 
not correct to migrate a virtqueue that is not initialized on the destination side because 
fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems' cannot be initialized 
by virtio_load() and neither by virtio_add_queue() after virtio_load() as fields like 
'vring.num' are already initialized by virtio_load().

For instance, in virtio_load() we set:

     for (i = 0; i < num; i++) {
         vdev->vq[i].vring.num = qemu_get_be32(f);

and in virtio_add_queue() we search for the firt available queue to add with:

     for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
         if (vdev->vq[i].vring.num == 0)
             break;
     }

So virtio_add_queue() cannot be used to set:

     vdev->vq[i].handle_output = handle_output;
     vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);

Moreover it would overwrite fields already set by virtio_load():

     vdev->vq[i].vring.num = queue_size;
     vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;

It also explains why virtio_net_change_num_queue_pairs() (indirectly called by 
virtio_net_set_features()) doesn't update the queue pair numbers: vring.num is already set 
so it thinks there is no more queues to add.

Thanks,
LAurent




^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-14 15:16     ` Laurent Vivier
@ 2024-10-17  6:59       ` Jason Wang
  2024-10-17  7:32         ` Laurent Vivier
  0 siblings, 1 reply; 42+ messages in thread
From: Jason Wang @ 2024-10-17  6:59 UTC (permalink / raw)
  To: Laurent Vivier; +Cc: Akihiko Odaki, qemu-devel

On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com> wrote:
>
> On 14/10/2024 10:30, Laurent Vivier wrote:
> > Hi Akihiko,
> >
> > On 04/06/2024 09:37, Jason Wang wrote:
> >> From: Akihiko Odaki <akihiko.odaki@daynix.com>
> >>
> >> Multiqueue usage is not negotiated yet when realizing. If more than
> >> one queue is added and the guest never requests to enable multiqueue,
> >> the extra queues will not be deleted when unrealizing and leak.
> >>
> >> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest doesn't support
> >> multiqueue")
> >> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> >> Signed-off-by: Jason Wang <jasowang@redhat.com>
> >> ---
> >>   hw/net/virtio-net.c | 4 +---
> >>   1 file changed, 1 insertion(+), 3 deletions(-)
> >>
> >> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> >> index 3cee2ef3ac..a8db8bfd9c 100644
> >> --- a/hw/net/virtio-net.c
> >> +++ b/hw/net/virtio-net.c
> >> @@ -3743,9 +3743,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
> >>       n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
> >>                                       n->net_conf.tx_queue_size);
> >> -    for (i = 0; i < n->max_queue_pairs; i++) {
> >> -        virtio_net_add_queue(n, i);
> >> -    }
> >> +    virtio_net_add_queue(n, 0);
> >>       n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
> >>       qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
> >
> > This change breaks virtio net migration when multiqueue is enabled.
> >
> > I think this is because virtqueues are half initialized after migration : they are
> > initialized on guest side (kernel is using them) but not on QEMU side (realized has only
> > initialized one). After migration, they are not initialized by the call to
> > virtio_net_set_multiqueue() from virtio_net_set_features() because virtio_get_num_queues()
> > reports already n->max_queue_pairs as this value is coming from the source guest memory.
> >
> > I don't think we have a way to half-initialize a virtqueue (to initialize them only on
> > QEMU side as they are already initialized on kernel side).
> >
> > I think this change should be reverted to fix the migration issue.
> >
>
> Moreover, if I look in the code of virtio_load() and virtio_add_queue() we can guess it's
> not correct to migrate a virtqueue that is not initialized on the destination side because
> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems' cannot be initialized
> by virtio_load() and neither by virtio_add_queue() after virtio_load() as fields like
> 'vring.num' are already initialized by virtio_load().
>
> For instance, in virtio_load() we set:
>
>      for (i = 0; i < num; i++) {
>          vdev->vq[i].vring.num = qemu_get_be32(f);
>
> and in virtio_add_queue() we search for the firt available queue to add with:
>
>      for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>          if (vdev->vq[i].vring.num == 0)
>              break;
>      }
>
> So virtio_add_queue() cannot be used to set:
>
>      vdev->vq[i].handle_output = handle_output;
>      vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>
> Moreover it would overwrite fields already set by virtio_load():
>
>      vdev->vq[i].vring.num = queue_size;
>      vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>
> It also explains why virtio_net_change_num_queue_pairs() (indirectly called by
> virtio_net_set_features()) doesn't update the queue pair numbers: vring.num is already set
> so it thinks there is no more queues to add.
>
> Thanks,
> LAurent
>

I agree.

Laurent, would you like to send a patch to revert this?

Thanks

>



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-17  6:59       ` Jason Wang
@ 2024-10-17  7:32         ` Laurent Vivier
  2024-10-17  9:07           ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Laurent Vivier @ 2024-10-17  7:32 UTC (permalink / raw)
  To: Jason Wang; +Cc: Akihiko Odaki, qemu-devel

On 17/10/2024 08:59, Jason Wang wrote:
> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com> wrote:
>>
>> On 14/10/2024 10:30, Laurent Vivier wrote:
>>> Hi Akihiko,
>>>
>>> On 04/06/2024 09:37, Jason Wang wrote:
>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>
>>>> Multiqueue usage is not negotiated yet when realizing. If more than
>>>> one queue is added and the guest never requests to enable multiqueue,
>>>> the extra queues will not be deleted when unrealizing and leak.
>>>>
>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest doesn't support
>>>> multiqueue")
>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>> ---
>>>>    hw/net/virtio-net.c | 4 +---
>>>>    1 file changed, 1 insertion(+), 3 deletions(-)
>>>>
>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>>>> index 3cee2ef3ac..a8db8bfd9c 100644
>>>> --- a/hw/net/virtio-net.c
>>>> +++ b/hw/net/virtio-net.c
>>>> @@ -3743,9 +3743,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)
>>>>        n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
>>>>                                        n->net_conf.tx_queue_size);
>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>>>> -        virtio_net_add_queue(n, i);
>>>> -    }
>>>> +    virtio_net_add_queue(n, 0);
>>>>        n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
>>>>        qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
>>>
>>> This change breaks virtio net migration when multiqueue is enabled.
>>>
>>> I think this is because virtqueues are half initialized after migration : they are
>>> initialized on guest side (kernel is using them) but not on QEMU side (realized has only
>>> initialized one). After migration, they are not initialized by the call to
>>> virtio_net_set_multiqueue() from virtio_net_set_features() because virtio_get_num_queues()
>>> reports already n->max_queue_pairs as this value is coming from the source guest memory.
>>>
>>> I don't think we have a way to half-initialize a virtqueue (to initialize them only on
>>> QEMU side as they are already initialized on kernel side).
>>>
>>> I think this change should be reverted to fix the migration issue.
>>>
>>
>> Moreover, if I look in the code of virtio_load() and virtio_add_queue() we can guess it's
>> not correct to migrate a virtqueue that is not initialized on the destination side because
>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems' cannot be initialized
>> by virtio_load() and neither by virtio_add_queue() after virtio_load() as fields like
>> 'vring.num' are already initialized by virtio_load().
>>
>> For instance, in virtio_load() we set:
>>
>>       for (i = 0; i < num; i++) {
>>           vdev->vq[i].vring.num = qemu_get_be32(f);
>>
>> and in virtio_add_queue() we search for the firt available queue to add with:
>>
>>       for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>>           if (vdev->vq[i].vring.num == 0)
>>               break;
>>       }
>>
>> So virtio_add_queue() cannot be used to set:
>>
>>       vdev->vq[i].handle_output = handle_output;
>>       vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>>
>> Moreover it would overwrite fields already set by virtio_load():
>>
>>       vdev->vq[i].vring.num = queue_size;
>>       vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>>
>> It also explains why virtio_net_change_num_queue_pairs() (indirectly called by
>> virtio_net_set_features()) doesn't update the queue pair numbers: vring.num is already set
>> so it thinks there is no more queues to add.
>>
>> Thanks,
>> LAurent
>>
> 
> I agree.
> 
> Laurent, would you like to send a patch to revert this?
> 

Yes. I will also try to fix the leak in unrealize that the patch wanted to fix initially.

Thanks,
Laurent



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-17  7:32         ` Laurent Vivier
@ 2024-10-17  9:07           ` Akihiko Odaki
  2024-10-17  9:17             ` Laurent Vivier
  0 siblings, 1 reply; 42+ messages in thread
From: Akihiko Odaki @ 2024-10-17  9:07 UTC (permalink / raw)
  To: Laurent Vivier, Jason Wang; +Cc: qemu-devel

On 2024/10/17 16:32, Laurent Vivier wrote:
> On 17/10/2024 08:59, Jason Wang wrote:
>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com> 
>> wrote:
>>>
>>> On 14/10/2024 10:30, Laurent Vivier wrote:
>>>> Hi Akihiko,
>>>>
>>>> On 04/06/2024 09:37, Jason Wang wrote:
>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>
>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
>>>>> one queue is added and the guest never requests to enable multiqueue,
>>>>> the extra queues will not be deleted when unrealizing and leak.
>>>>>
>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest 
>>>>> doesn't support
>>>>> multiqueue")
>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>> ---
>>>>>    hw/net/virtio-net.c | 4 +---
>>>>>    1 file changed, 1 insertion(+), 3 deletions(-)
>>>>>
>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
>>>>> --- a/hw/net/virtio-net.c
>>>>> +++ b/hw/net/virtio-net.c
>>>>> @@ -3743,9 +3743,7 @@ static void 
>>>>> virtio_net_device_realize(DeviceState *dev, Error **errp)
>>>>>        n->net_conf.tx_queue_size = 
>>>>> MIN(virtio_net_max_tx_queue_size(n),
>>>>>                                        n->net_conf.tx_queue_size);
>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>>>>> -        virtio_net_add_queue(n, i);
>>>>> -    }
>>>>> +    virtio_net_add_queue(n, 0);
>>>>>        n->ctrl_vq = virtio_add_queue(vdev, 64, 
>>>>> virtio_net_handle_ctrl);
>>>>>        qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
>>>>
>>>> This change breaks virtio net migration when multiqueue is enabled.
>>>>
>>>> I think this is because virtqueues are half initialized after 
>>>> migration : they are
>>>> initialized on guest side (kernel is using them) but not on QEMU 
>>>> side (realized has only
>>>> initialized one). After migration, they are not initialized by the 
>>>> call to
>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because 
>>>> virtio_get_num_queues()
>>>> reports already n->max_queue_pairs as this value is coming from the 
>>>> source guest memory.
>>>>
>>>> I don't think we have a way to half-initialize a virtqueue (to 
>>>> initialize them only on
>>>> QEMU side as they are already initialized on kernel side).
>>>>
>>>> I think this change should be reverted to fix the migration issue.
>>>>
>>>
>>> Moreover, if I look in the code of virtio_load() and 
>>> virtio_add_queue() we can guess it's
>>> not correct to migrate a virtqueue that is not initialized on the 
>>> destination side because
>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems' 
>>> cannot be initialized
>>> by virtio_load() and neither by virtio_add_queue() after 
>>> virtio_load() as fields like
>>> 'vring.num' are already initialized by virtio_load().
>>>
>>> For instance, in virtio_load() we set:
>>>
>>>       for (i = 0; i < num; i++) {
>>>           vdev->vq[i].vring.num = qemu_get_be32(f);
>>>
>>> and in virtio_add_queue() we search for the firt available queue to 
>>> add with:
>>>
>>>       for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>>>           if (vdev->vq[i].vring.num == 0)
>>>               break;
>>>       }
>>>
>>> So virtio_add_queue() cannot be used to set:
>>>
>>>       vdev->vq[i].handle_output = handle_output;
>>>       vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>>>
>>> Moreover it would overwrite fields already set by virtio_load():
>>>
>>>       vdev->vq[i].vring.num = queue_size;
>>>       vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>>>
>>> It also explains why virtio_net_change_num_queue_pairs() (indirectly 
>>> called by
>>> virtio_net_set_features()) doesn't update the queue pair numbers: 
>>> vring.num is already set
>>> so it thinks there is no more queues to add.
>>>
>>> Thanks,
>>> LAurent
>>>
>>
>> I agree.
>>
>> Laurent, would you like to send a patch to revert this?
>>
> 
> Yes. I will also try to fix the leak in unrealize that the patch wanted 
> to fix initially.

I wrote a fix so I will submit it once internal testing is done. You can 
see the change at:
https://gitlab.com/akihiko.odaki/qemu-kvm/-/commit/22161221aa2d2031d7ad1be7701852083aa9109a

Regards,
Akihiko Odaki


^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-17  9:07           ` Akihiko Odaki
@ 2024-10-17  9:17             ` Laurent Vivier
  2024-10-17  9:42               ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Laurent Vivier @ 2024-10-17  9:17 UTC (permalink / raw)
  To: Akihiko Odaki, Jason Wang; +Cc: qemu-devel, Michael S. Tsirkin

On 17/10/2024 11:07, Akihiko Odaki wrote:
> On 2024/10/17 16:32, Laurent Vivier wrote:
>> On 17/10/2024 08:59, Jason Wang wrote:
>>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com> wrote:
>>>>
>>>> On 14/10/2024 10:30, Laurent Vivier wrote:
>>>>> Hi Akihiko,
>>>>>
>>>>> On 04/06/2024 09:37, Jason Wang wrote:
>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>
>>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
>>>>>> one queue is added and the guest never requests to enable multiqueue,
>>>>>> the extra queues will not be deleted when unrealizing and leak.
>>>>>>
>>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the guest doesn't support
>>>>>> multiqueue")
>>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>>> ---
>>>>>>    hw/net/virtio-net.c | 4 +---
>>>>>>    1 file changed, 1 insertion(+), 3 deletions(-)
>>>>>>
>>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
>>>>>> --- a/hw/net/virtio-net.c
>>>>>> +++ b/hw/net/virtio-net.c
>>>>>> @@ -3743,9 +3743,7 @@ static void virtio_net_device_realize(DeviceState *dev, Error 
>>>>>> **errp)
>>>>>>        n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
>>>>>>                                        n->net_conf.tx_queue_size);
>>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>>>>>> -        virtio_net_add_queue(n, i);
>>>>>> -    }
>>>>>> +    virtio_net_add_queue(n, 0);
>>>>>>        n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
>>>>>>        qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
>>>>>
>>>>> This change breaks virtio net migration when multiqueue is enabled.
>>>>>
>>>>> I think this is because virtqueues are half initialized after migration : they are
>>>>> initialized on guest side (kernel is using them) but not on QEMU side (realized has only
>>>>> initialized one). After migration, they are not initialized by the call to
>>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because 
>>>>> virtio_get_num_queues()
>>>>> reports already n->max_queue_pairs as this value is coming from the source guest memory.
>>>>>
>>>>> I don't think we have a way to half-initialize a virtqueue (to initialize them only on
>>>>> QEMU side as they are already initialized on kernel side).
>>>>>
>>>>> I think this change should be reverted to fix the migration issue.
>>>>>
>>>>
>>>> Moreover, if I look in the code of virtio_load() and virtio_add_queue() we can guess it's
>>>> not correct to migrate a virtqueue that is not initialized on the destination side 
>>>> because
>>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems' cannot be initialized
>>>> by virtio_load() and neither by virtio_add_queue() after virtio_load() as fields like
>>>> 'vring.num' are already initialized by virtio_load().
>>>>
>>>> For instance, in virtio_load() we set:
>>>>
>>>>       for (i = 0; i < num; i++) {
>>>>           vdev->vq[i].vring.num = qemu_get_be32(f);
>>>>
>>>> and in virtio_add_queue() we search for the firt available queue to add with:
>>>>
>>>>       for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>>>>           if (vdev->vq[i].vring.num == 0)
>>>>               break;
>>>>       }
>>>>
>>>> So virtio_add_queue() cannot be used to set:
>>>>
>>>>       vdev->vq[i].handle_output = handle_output;
>>>>       vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>>>>
>>>> Moreover it would overwrite fields already set by virtio_load():
>>>>
>>>>       vdev->vq[i].vring.num = queue_size;
>>>>       vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>>>>
>>>> It also explains why virtio_net_change_num_queue_pairs() (indirectly called by
>>>> virtio_net_set_features()) doesn't update the queue pair numbers: vring.num is already 
>>>> set
>>>> so it thinks there is no more queues to add.
>>>>
>>>> Thanks,
>>>> LAurent
>>>>
>>>
>>> I agree.
>>>
>>> Laurent, would you like to send a patch to revert this?
>>>
>>
>> Yes. I will also try to fix the leak in unrealize that the patch wanted to fix initially.
> 
> I wrote a fix so I will submit it once internal testing is done. You can see the change at:
> https://gitlab.com/akihiko.odaki/qemu-kvm/-/commit/22161221aa2d2031d7ad1be7701852083aa9109a

It works fine for me but I don't know if it's a good idea to add queues while the state is 
loading.

Jason, let me know which solution you prefer (revert or pre_load_queues helper).

CC'ing MST

Thanks,
Laurent



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-17  9:17             ` Laurent Vivier
@ 2024-10-17  9:42               ` Akihiko Odaki
  2024-10-18  4:50                 ` Jason Wang
  0 siblings, 1 reply; 42+ messages in thread
From: Akihiko Odaki @ 2024-10-17  9:42 UTC (permalink / raw)
  To: Laurent Vivier, Jason Wang; +Cc: qemu-devel, Michael S. Tsirkin

On 2024/10/17 18:17, Laurent Vivier wrote:
> On 17/10/2024 11:07, Akihiko Odaki wrote:
>> On 2024/10/17 16:32, Laurent Vivier wrote:
>>> On 17/10/2024 08:59, Jason Wang wrote:
>>>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com> 
>>>> wrote:
>>>>>
>>>>> On 14/10/2024 10:30, Laurent Vivier wrote:
>>>>>> Hi Akihiko,
>>>>>>
>>>>>> On 04/06/2024 09:37, Jason Wang wrote:
>>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>>
>>>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
>>>>>>> one queue is added and the guest never requests to enable 
>>>>>>> multiqueue,
>>>>>>> the extra queues will not be deleted when unrealizing and leak.
>>>>>>>
>>>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the 
>>>>>>> guest doesn't support
>>>>>>> multiqueue")
>>>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>>>> ---
>>>>>>>    hw/net/virtio-net.c | 4 +---
>>>>>>>    1 file changed, 1 insertion(+), 3 deletions(-)
>>>>>>>
>>>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>>>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
>>>>>>> --- a/hw/net/virtio-net.c
>>>>>>> +++ b/hw/net/virtio-net.c
>>>>>>> @@ -3743,9 +3743,7 @@ static void 
>>>>>>> virtio_net_device_realize(DeviceState *dev, Error **errp)
>>>>>>>        n->net_conf.tx_queue_size = 
>>>>>>> MIN(virtio_net_max_tx_queue_size(n),
>>>>>>>                                        n->net_conf.tx_queue_size);
>>>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>>>>>>> -        virtio_net_add_queue(n, i);
>>>>>>> -    }
>>>>>>> +    virtio_net_add_queue(n, 0);
>>>>>>>        n->ctrl_vq = virtio_add_queue(vdev, 64, 
>>>>>>> virtio_net_handle_ctrl);
>>>>>>>        qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
>>>>>>
>>>>>> This change breaks virtio net migration when multiqueue is enabled.
>>>>>>
>>>>>> I think this is because virtqueues are half initialized after 
>>>>>> migration : they are
>>>>>> initialized on guest side (kernel is using them) but not on QEMU 
>>>>>> side (realized has only
>>>>>> initialized one). After migration, they are not initialized by the 
>>>>>> call to
>>>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because 
>>>>>> virtio_get_num_queues()
>>>>>> reports already n->max_queue_pairs as this value is coming from 
>>>>>> the source guest memory.
>>>>>>
>>>>>> I don't think we have a way to half-initialize a virtqueue (to 
>>>>>> initialize them only on
>>>>>> QEMU side as they are already initialized on kernel side).
>>>>>>
>>>>>> I think this change should be reverted to fix the migration issue.
>>>>>>
>>>>>
>>>>> Moreover, if I look in the code of virtio_load() and 
>>>>> virtio_add_queue() we can guess it's
>>>>> not correct to migrate a virtqueue that is not initialized on the 
>>>>> destination side because
>>>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems' 
>>>>> cannot be initialized
>>>>> by virtio_load() and neither by virtio_add_queue() after 
>>>>> virtio_load() as fields like
>>>>> 'vring.num' are already initialized by virtio_load().
>>>>>
>>>>> For instance, in virtio_load() we set:
>>>>>
>>>>>       for (i = 0; i < num; i++) {
>>>>>           vdev->vq[i].vring.num = qemu_get_be32(f);
>>>>>
>>>>> and in virtio_add_queue() we search for the firt available queue to 
>>>>> add with:
>>>>>
>>>>>       for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>>>>>           if (vdev->vq[i].vring.num == 0)
>>>>>               break;
>>>>>       }
>>>>>
>>>>> So virtio_add_queue() cannot be used to set:
>>>>>
>>>>>       vdev->vq[i].handle_output = handle_output;
>>>>>       vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>>>>>
>>>>> Moreover it would overwrite fields already set by virtio_load():
>>>>>
>>>>>       vdev->vq[i].vring.num = queue_size;
>>>>>       vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>>>>>
>>>>> It also explains why virtio_net_change_num_queue_pairs() 
>>>>> (indirectly called by
>>>>> virtio_net_set_features()) doesn't update the queue pair numbers: 
>>>>> vring.num is already set
>>>>> so it thinks there is no more queues to add.
>>>>>
>>>>> Thanks,
>>>>> LAurent
>>>>>
>>>>
>>>> I agree.
>>>>
>>>> Laurent, would you like to send a patch to revert this?
>>>>
>>>
>>> Yes. I will also try to fix the leak in unrealize that the patch 
>>> wanted to fix initially.
>>
>> I wrote a fix so I will submit it once internal testing is done. You 
>> can see the change at:
>> https://gitlab.com/akihiko.odaki/qemu-kvm/-/ 
>> commit/22161221aa2d2031d7ad1be7701852083aa9109a
> 
> It works fine for me but I don't know if it's a good idea to add queues 
> while the state is loading.

I couldn't come up with other options. The problem is that the number of 
queues added during realization does not match with the loaded state. We 
need to add queues after knowing the negotiated feature set and before 
loading the queue states to fix this problem.

Reverting will add queues that are used when the multiqueue feature is 
negotiated so it will fix migration for such cases, but will also break 
the other cases (i.e., the multiqueue feature is not negotiated) as it 
adds too many queues.

Regards,
Akihiko Odaki

> 
> Jason, let me know which solution you prefer (revert or pre_load_queues 
> helper).
> 
> CC'ing MST
> 
> Thanks,
> Laurent
> 



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-17  9:42               ` Akihiko Odaki
@ 2024-10-18  4:50                 ` Jason Wang
  2024-10-19 12:38                   ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Jason Wang @ 2024-10-18  4:50 UTC (permalink / raw)
  To: Akihiko Odaki; +Cc: Laurent Vivier, qemu-devel, Michael S. Tsirkin

On Thu, Oct 17, 2024 at 5:42 PM Akihiko Odaki <akihiko.odaki@daynix.com> wrote:
>
> On 2024/10/17 18:17, Laurent Vivier wrote:
> > On 17/10/2024 11:07, Akihiko Odaki wrote:
> >> On 2024/10/17 16:32, Laurent Vivier wrote:
> >>> On 17/10/2024 08:59, Jason Wang wrote:
> >>>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com>
> >>>> wrote:
> >>>>>
> >>>>> On 14/10/2024 10:30, Laurent Vivier wrote:
> >>>>>> Hi Akihiko,
> >>>>>>
> >>>>>> On 04/06/2024 09:37, Jason Wang wrote:
> >>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
> >>>>>>>
> >>>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
> >>>>>>> one queue is added and the guest never requests to enable
> >>>>>>> multiqueue,
> >>>>>>> the extra queues will not be deleted when unrealizing and leak.
> >>>>>>>
> >>>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the
> >>>>>>> guest doesn't support
> >>>>>>> multiqueue")
> >>>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> >>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
> >>>>>>> ---
> >>>>>>>    hw/net/virtio-net.c | 4 +---
> >>>>>>>    1 file changed, 1 insertion(+), 3 deletions(-)
> >>>>>>>
> >>>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> >>>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
> >>>>>>> --- a/hw/net/virtio-net.c
> >>>>>>> +++ b/hw/net/virtio-net.c
> >>>>>>> @@ -3743,9 +3743,7 @@ static void
> >>>>>>> virtio_net_device_realize(DeviceState *dev, Error **errp)
> >>>>>>>        n->net_conf.tx_queue_size =
> >>>>>>> MIN(virtio_net_max_tx_queue_size(n),
> >>>>>>>                                        n->net_conf.tx_queue_size);
> >>>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
> >>>>>>> -        virtio_net_add_queue(n, i);
> >>>>>>> -    }
> >>>>>>> +    virtio_net_add_queue(n, 0);
> >>>>>>>        n->ctrl_vq = virtio_add_queue(vdev, 64,
> >>>>>>> virtio_net_handle_ctrl);
> >>>>>>>        qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
> >>>>>>
> >>>>>> This change breaks virtio net migration when multiqueue is enabled.
> >>>>>>
> >>>>>> I think this is because virtqueues are half initialized after
> >>>>>> migration : they are
> >>>>>> initialized on guest side (kernel is using them) but not on QEMU
> >>>>>> side (realized has only
> >>>>>> initialized one). After migration, they are not initialized by the
> >>>>>> call to
> >>>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because
> >>>>>> virtio_get_num_queues()
> >>>>>> reports already n->max_queue_pairs as this value is coming from
> >>>>>> the source guest memory.
> >>>>>>
> >>>>>> I don't think we have a way to half-initialize a virtqueue (to
> >>>>>> initialize them only on
> >>>>>> QEMU side as they are already initialized on kernel side).
> >>>>>>
> >>>>>> I think this change should be reverted to fix the migration issue.
> >>>>>>
> >>>>>
> >>>>> Moreover, if I look in the code of virtio_load() and
> >>>>> virtio_add_queue() we can guess it's
> >>>>> not correct to migrate a virtqueue that is not initialized on the
> >>>>> destination side because
> >>>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems'
> >>>>> cannot be initialized
> >>>>> by virtio_load() and neither by virtio_add_queue() after
> >>>>> virtio_load() as fields like
> >>>>> 'vring.num' are already initialized by virtio_load().
> >>>>>
> >>>>> For instance, in virtio_load() we set:
> >>>>>
> >>>>>       for (i = 0; i < num; i++) {
> >>>>>           vdev->vq[i].vring.num = qemu_get_be32(f);
> >>>>>
> >>>>> and in virtio_add_queue() we search for the firt available queue to
> >>>>> add with:
> >>>>>
> >>>>>       for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
> >>>>>           if (vdev->vq[i].vring.num == 0)
> >>>>>               break;
> >>>>>       }
> >>>>>
> >>>>> So virtio_add_queue() cannot be used to set:
> >>>>>
> >>>>>       vdev->vq[i].handle_output = handle_output;
> >>>>>       vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
> >>>>>
> >>>>> Moreover it would overwrite fields already set by virtio_load():
> >>>>>
> >>>>>       vdev->vq[i].vring.num = queue_size;
> >>>>>       vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
> >>>>>
> >>>>> It also explains why virtio_net_change_num_queue_pairs()
> >>>>> (indirectly called by
> >>>>> virtio_net_set_features()) doesn't update the queue pair numbers:
> >>>>> vring.num is already set
> >>>>> so it thinks there is no more queues to add.
> >>>>>
> >>>>> Thanks,
> >>>>> LAurent
> >>>>>
> >>>>
> >>>> I agree.
> >>>>
> >>>> Laurent, would you like to send a patch to revert this?
> >>>>
> >>>
> >>> Yes. I will also try to fix the leak in unrealize that the patch
> >>> wanted to fix initially.
> >>
> >> I wrote a fix so I will submit it once internal testing is done. You
> >> can see the change at:
> >> https://gitlab.com/akihiko.odaki/qemu-kvm/-/
> >> commit/22161221aa2d2031d7ad1be7701852083aa9109a
> >
> > It works fine for me but I don't know if it's a good idea to add queues
> > while the state is loading.
>
> I couldn't come up with other options. The problem is that the number of
> queues added during realization does not match with the loaded state. We
> need to add queues after knowing the negotiated feature set and before
> loading the queue states to fix this problem.
>
> Reverting will add queues that are used when the multiqueue feature is
> negotiated so it will fix migration for such cases, but will also break
> the other cases (i.e., the multiqueue feature is not negotiated) as it
> adds too many queues.
>
> Regards,
> Akihiko Odaki

I wonder if the following is much more simpler:

1) introducing booleans whether the queue has been deleted
2) in unrelize, deleted only the queue that has not been deleted

?

Thanks

>
> >
> > Jason, let me know which solution you prefer (revert or pre_load_queues
> > helper).
> >
> > CC'ing MST
> >
> > Thanks,
> > Laurent
> >
>



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-18  4:50                 ` Jason Wang
@ 2024-10-19 12:38                   ` Akihiko Odaki
  2024-10-21  7:23                     ` Jason Wang
  0 siblings, 1 reply; 42+ messages in thread
From: Akihiko Odaki @ 2024-10-19 12:38 UTC (permalink / raw)
  To: Jason Wang; +Cc: Laurent Vivier, qemu-devel, Michael S. Tsirkin

On 2024/10/18 13:50, Jason Wang wrote:
> On Thu, Oct 17, 2024 at 5:42 PM Akihiko Odaki <akihiko.odaki@daynix.com> wrote:
>>
>> On 2024/10/17 18:17, Laurent Vivier wrote:
>>> On 17/10/2024 11:07, Akihiko Odaki wrote:
>>>> On 2024/10/17 16:32, Laurent Vivier wrote:
>>>>> On 17/10/2024 08:59, Jason Wang wrote:
>>>>>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com>
>>>>>> wrote:
>>>>>>>
>>>>>>> On 14/10/2024 10:30, Laurent Vivier wrote:
>>>>>>>> Hi Akihiko,
>>>>>>>>
>>>>>>>> On 04/06/2024 09:37, Jason Wang wrote:
>>>>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>>>>
>>>>>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
>>>>>>>>> one queue is added and the guest never requests to enable
>>>>>>>>> multiqueue,
>>>>>>>>> the extra queues will not be deleted when unrealizing and leak.
>>>>>>>>>
>>>>>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the
>>>>>>>>> guest doesn't support
>>>>>>>>> multiqueue")
>>>>>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>>>>>> ---
>>>>>>>>>     hw/net/virtio-net.c | 4 +---
>>>>>>>>>     1 file changed, 1 insertion(+), 3 deletions(-)
>>>>>>>>>
>>>>>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>>>>>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
>>>>>>>>> --- a/hw/net/virtio-net.c
>>>>>>>>> +++ b/hw/net/virtio-net.c
>>>>>>>>> @@ -3743,9 +3743,7 @@ static void
>>>>>>>>> virtio_net_device_realize(DeviceState *dev, Error **errp)
>>>>>>>>>         n->net_conf.tx_queue_size =
>>>>>>>>> MIN(virtio_net_max_tx_queue_size(n),
>>>>>>>>>                                         n->net_conf.tx_queue_size);
>>>>>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>>>>>>>>> -        virtio_net_add_queue(n, i);
>>>>>>>>> -    }
>>>>>>>>> +    virtio_net_add_queue(n, 0);
>>>>>>>>>         n->ctrl_vq = virtio_add_queue(vdev, 64,
>>>>>>>>> virtio_net_handle_ctrl);
>>>>>>>>>         qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
>>>>>>>>
>>>>>>>> This change breaks virtio net migration when multiqueue is enabled.
>>>>>>>>
>>>>>>>> I think this is because virtqueues are half initialized after
>>>>>>>> migration : they are
>>>>>>>> initialized on guest side (kernel is using them) but not on QEMU
>>>>>>>> side (realized has only
>>>>>>>> initialized one). After migration, they are not initialized by the
>>>>>>>> call to
>>>>>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because
>>>>>>>> virtio_get_num_queues()
>>>>>>>> reports already n->max_queue_pairs as this value is coming from
>>>>>>>> the source guest memory.
>>>>>>>>
>>>>>>>> I don't think we have a way to half-initialize a virtqueue (to
>>>>>>>> initialize them only on
>>>>>>>> QEMU side as they are already initialized on kernel side).
>>>>>>>>
>>>>>>>> I think this change should be reverted to fix the migration issue.
>>>>>>>>
>>>>>>>
>>>>>>> Moreover, if I look in the code of virtio_load() and
>>>>>>> virtio_add_queue() we can guess it's
>>>>>>> not correct to migrate a virtqueue that is not initialized on the
>>>>>>> destination side because
>>>>>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems'
>>>>>>> cannot be initialized
>>>>>>> by virtio_load() and neither by virtio_add_queue() after
>>>>>>> virtio_load() as fields like
>>>>>>> 'vring.num' are already initialized by virtio_load().
>>>>>>>
>>>>>>> For instance, in virtio_load() we set:
>>>>>>>
>>>>>>>        for (i = 0; i < num; i++) {
>>>>>>>            vdev->vq[i].vring.num = qemu_get_be32(f);
>>>>>>>
>>>>>>> and in virtio_add_queue() we search for the firt available queue to
>>>>>>> add with:
>>>>>>>
>>>>>>>        for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>>>>>>>            if (vdev->vq[i].vring.num == 0)
>>>>>>>                break;
>>>>>>>        }
>>>>>>>
>>>>>>> So virtio_add_queue() cannot be used to set:
>>>>>>>
>>>>>>>        vdev->vq[i].handle_output = handle_output;
>>>>>>>        vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>>>>>>>
>>>>>>> Moreover it would overwrite fields already set by virtio_load():
>>>>>>>
>>>>>>>        vdev->vq[i].vring.num = queue_size;
>>>>>>>        vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>>>>>>>
>>>>>>> It also explains why virtio_net_change_num_queue_pairs()
>>>>>>> (indirectly called by
>>>>>>> virtio_net_set_features()) doesn't update the queue pair numbers:
>>>>>>> vring.num is already set
>>>>>>> so it thinks there is no more queues to add.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> LAurent
>>>>>>>
>>>>>>
>>>>>> I agree.
>>>>>>
>>>>>> Laurent, would you like to send a patch to revert this?
>>>>>>
>>>>>
>>>>> Yes. I will also try to fix the leak in unrealize that the patch
>>>>> wanted to fix initially.
>>>>
>>>> I wrote a fix so I will submit it once internal testing is done. You
>>>> can see the change at:
>>>> https://gitlab.com/akihiko.odaki/qemu-kvm/-/
>>>> commit/22161221aa2d2031d7ad1be7701852083aa9109a
>>>
>>> It works fine for me but I don't know if it's a good idea to add queues
>>> while the state is loading.
>>
>> I couldn't come up with other options. The problem is that the number of
>> queues added during realization does not match with the loaded state. We
>> need to add queues after knowing the negotiated feature set and before
>> loading the queue states to fix this problem.
>>
>> Reverting will add queues that are used when the multiqueue feature is
>> negotiated so it will fix migration for such cases, but will also break
>> the other cases (i.e., the multiqueue feature is not negotiated) as it
>> adds too many queues.
>>
>> Regards,
>> Akihiko Odaki
> 
> I wonder if the following is much more simpler:
> 
> 1) introducing booleans whether the queue has been deleted
> 2) in unrelize, deleted only the queue that has not been deleted

The memory leak problem is trivial to solve, but the problem with queue 
state loading is not. We need to ensure the number of queues are 
consistent with the number of loaded queues.

We currently have too few queues if the multiqueue feature is 
negotiated, which results in queues partially initialized with the 
loaded state. Reverting will leave too many queues for the cases where 
the multiqueue feature is not negotiated, which is also problematic 
because virtio-net will reconfigure queues to reduce the number of 
queues and dispose loaded states.

Regards,
Akihiko Odaki

> 
> ?
> 
> Thanks
> 
>>
>>>
>>> Jason, let me know which solution you prefer (revert or pre_load_queues
>>> helper).
>>>
>>> CC'ing MST
>>>
>>> Thanks,
>>> Laurent
>>>
>>
> 



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-19 12:38                   ` Akihiko Odaki
@ 2024-10-21  7:23                     ` Jason Wang
  2024-10-21  8:40                       ` Akihiko Odaki
  0 siblings, 1 reply; 42+ messages in thread
From: Jason Wang @ 2024-10-21  7:23 UTC (permalink / raw)
  To: Akihiko Odaki; +Cc: Laurent Vivier, qemu-devel, Michael S. Tsirkin

On Sat, Oct 19, 2024 at 8:38 PM Akihiko Odaki <akihiko.odaki@daynix.com> wrote:
>
> On 2024/10/18 13:50, Jason Wang wrote:
> > On Thu, Oct 17, 2024 at 5:42 PM Akihiko Odaki <akihiko.odaki@daynix.com> wrote:
> >>
> >> On 2024/10/17 18:17, Laurent Vivier wrote:
> >>> On 17/10/2024 11:07, Akihiko Odaki wrote:
> >>>> On 2024/10/17 16:32, Laurent Vivier wrote:
> >>>>> On 17/10/2024 08:59, Jason Wang wrote:
> >>>>>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com>
> >>>>>> wrote:
> >>>>>>>
> >>>>>>> On 14/10/2024 10:30, Laurent Vivier wrote:
> >>>>>>>> Hi Akihiko,
> >>>>>>>>
> >>>>>>>> On 04/06/2024 09:37, Jason Wang wrote:
> >>>>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
> >>>>>>>>>
> >>>>>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
> >>>>>>>>> one queue is added and the guest never requests to enable
> >>>>>>>>> multiqueue,
> >>>>>>>>> the extra queues will not be deleted when unrealizing and leak.
> >>>>>>>>>
> >>>>>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the
> >>>>>>>>> guest doesn't support
> >>>>>>>>> multiqueue")
> >>>>>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> >>>>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
> >>>>>>>>> ---
> >>>>>>>>>     hw/net/virtio-net.c | 4 +---
> >>>>>>>>>     1 file changed, 1 insertion(+), 3 deletions(-)
> >>>>>>>>>
> >>>>>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> >>>>>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
> >>>>>>>>> --- a/hw/net/virtio-net.c
> >>>>>>>>> +++ b/hw/net/virtio-net.c
> >>>>>>>>> @@ -3743,9 +3743,7 @@ static void
> >>>>>>>>> virtio_net_device_realize(DeviceState *dev, Error **errp)
> >>>>>>>>>         n->net_conf.tx_queue_size =
> >>>>>>>>> MIN(virtio_net_max_tx_queue_size(n),
> >>>>>>>>>                                         n->net_conf.tx_queue_size);
> >>>>>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
> >>>>>>>>> -        virtio_net_add_queue(n, i);
> >>>>>>>>> -    }
> >>>>>>>>> +    virtio_net_add_queue(n, 0);
> >>>>>>>>>         n->ctrl_vq = virtio_add_queue(vdev, 64,
> >>>>>>>>> virtio_net_handle_ctrl);
> >>>>>>>>>         qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
> >>>>>>>>
> >>>>>>>> This change breaks virtio net migration when multiqueue is enabled.
> >>>>>>>>
> >>>>>>>> I think this is because virtqueues are half initialized after
> >>>>>>>> migration : they are
> >>>>>>>> initialized on guest side (kernel is using them) but not on QEMU
> >>>>>>>> side (realized has only
> >>>>>>>> initialized one). After migration, they are not initialized by the
> >>>>>>>> call to
> >>>>>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because
> >>>>>>>> virtio_get_num_queues()
> >>>>>>>> reports already n->max_queue_pairs as this value is coming from
> >>>>>>>> the source guest memory.
> >>>>>>>>
> >>>>>>>> I don't think we have a way to half-initialize a virtqueue (to
> >>>>>>>> initialize them only on
> >>>>>>>> QEMU side as they are already initialized on kernel side).
> >>>>>>>>
> >>>>>>>> I think this change should be reverted to fix the migration issue.
> >>>>>>>>
> >>>>>>>
> >>>>>>> Moreover, if I look in the code of virtio_load() and
> >>>>>>> virtio_add_queue() we can guess it's
> >>>>>>> not correct to migrate a virtqueue that is not initialized on the
> >>>>>>> destination side because
> >>>>>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems'
> >>>>>>> cannot be initialized
> >>>>>>> by virtio_load() and neither by virtio_add_queue() after
> >>>>>>> virtio_load() as fields like
> >>>>>>> 'vring.num' are already initialized by virtio_load().
> >>>>>>>
> >>>>>>> For instance, in virtio_load() we set:
> >>>>>>>
> >>>>>>>        for (i = 0; i < num; i++) {
> >>>>>>>            vdev->vq[i].vring.num = qemu_get_be32(f);
> >>>>>>>
> >>>>>>> and in virtio_add_queue() we search for the firt available queue to
> >>>>>>> add with:
> >>>>>>>
> >>>>>>>        for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
> >>>>>>>            if (vdev->vq[i].vring.num == 0)
> >>>>>>>                break;
> >>>>>>>        }
> >>>>>>>
> >>>>>>> So virtio_add_queue() cannot be used to set:
> >>>>>>>
> >>>>>>>        vdev->vq[i].handle_output = handle_output;
> >>>>>>>        vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
> >>>>>>>
> >>>>>>> Moreover it would overwrite fields already set by virtio_load():
> >>>>>>>
> >>>>>>>        vdev->vq[i].vring.num = queue_size;
> >>>>>>>        vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
> >>>>>>>
> >>>>>>> It also explains why virtio_net_change_num_queue_pairs()
> >>>>>>> (indirectly called by
> >>>>>>> virtio_net_set_features()) doesn't update the queue pair numbers:
> >>>>>>> vring.num is already set
> >>>>>>> so it thinks there is no more queues to add.
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>> LAurent
> >>>>>>>
> >>>>>>
> >>>>>> I agree.
> >>>>>>
> >>>>>> Laurent, would you like to send a patch to revert this?
> >>>>>>
> >>>>>
> >>>>> Yes. I will also try to fix the leak in unrealize that the patch
> >>>>> wanted to fix initially.
> >>>>
> >>>> I wrote a fix so I will submit it once internal testing is done. You
> >>>> can see the change at:
> >>>> https://gitlab.com/akihiko.odaki/qemu-kvm/-/
> >>>> commit/22161221aa2d2031d7ad1be7701852083aa9109a
> >>>
> >>> It works fine for me but I don't know if it's a good idea to add queues
> >>> while the state is loading.
> >>
> >> I couldn't come up with other options. The problem is that the number of
> >> queues added during realization does not match with the loaded state. We
> >> need to add queues after knowing the negotiated feature set and before
> >> loading the queue states to fix this problem.
> >>
> >> Reverting will add queues that are used when the multiqueue feature is
> >> negotiated so it will fix migration for such cases, but will also break
> >> the other cases (i.e., the multiqueue feature is not negotiated) as it
> >> adds too many queues.
> >>
> >> Regards,
> >> Akihiko Odaki
> >
> > I wonder if the following is much more simpler:
> >
> > 1) introducing booleans whether the queue has been deleted
> > 2) in unrelize, deleted only the queue that has not been deleted
>
> The memory leak problem is trivial to solve, but the problem with queue
> state loading is not. We need to ensure the number of queues are
> consistent with the number of loaded queues.
>
> We currently have too few queues if the multiqueue feature is
> negotiated, which results in queues partially initialized with the
> loaded state. Reverting will leave too many queues for the cases where
> the multiqueue feature is not negotiated, which is also problematic
> because virtio-net will reconfigure queues to reduce the number of
> queues and dispose loaded states.

I'm not sure I would get here, if those queues were not visible to
drivers. Why do we care?

Thanks

>
> Regards,
> Akihiko Odaki
>
> >
> > ?
> >
> > Thanks
> >
> >>
> >>>
> >>> Jason, let me know which solution you prefer (revert or pre_load_queues
> >>> helper).
> >>>
> >>> CC'ing MST
> >>>
> >>> Thanks,
> >>> Laurent
> >>>
> >>
> >
>



^ permalink raw reply	[flat|nested] 42+ messages in thread

* Re: [PULL 08/20] virtio-net: Add only one queue pair when realizing
  2024-10-21  7:23                     ` Jason Wang
@ 2024-10-21  8:40                       ` Akihiko Odaki
  0 siblings, 0 replies; 42+ messages in thread
From: Akihiko Odaki @ 2024-10-21  8:40 UTC (permalink / raw)
  To: Jason Wang; +Cc: Laurent Vivier, qemu-devel, Michael S. Tsirkin

On 2024/10/21 16:23, Jason Wang wrote:
> On Sat, Oct 19, 2024 at 8:38 PM Akihiko Odaki <akihiko.odaki@daynix.com> wrote:
>>
>> On 2024/10/18 13:50, Jason Wang wrote:
>>> On Thu, Oct 17, 2024 at 5:42 PM Akihiko Odaki <akihiko.odaki@daynix.com> wrote:
>>>>
>>>> On 2024/10/17 18:17, Laurent Vivier wrote:
>>>>> On 17/10/2024 11:07, Akihiko Odaki wrote:
>>>>>> On 2024/10/17 16:32, Laurent Vivier wrote:
>>>>>>> On 17/10/2024 08:59, Jason Wang wrote:
>>>>>>>> On Mon, Oct 14, 2024 at 11:16 PM Laurent Vivier <lvivier@redhat.com>
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> On 14/10/2024 10:30, Laurent Vivier wrote:
>>>>>>>>>> Hi Akihiko,
>>>>>>>>>>
>>>>>>>>>> On 04/06/2024 09:37, Jason Wang wrote:
>>>>>>>>>>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>>>>>>
>>>>>>>>>>> Multiqueue usage is not negotiated yet when realizing. If more than
>>>>>>>>>>> one queue is added and the guest never requests to enable
>>>>>>>>>>> multiqueue,
>>>>>>>>>>> the extra queues will not be deleted when unrealizing and leak.
>>>>>>>>>>>
>>>>>>>>>>> Fixes: f9d6dbf0bf6e ("virtio-net: remove virtio queues if the
>>>>>>>>>>> guest doesn't support
>>>>>>>>>>> multiqueue")
>>>>>>>>>>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>>>>>>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>>>>>>>> ---
>>>>>>>>>>>      hw/net/virtio-net.c | 4 +---
>>>>>>>>>>>      1 file changed, 1 insertion(+), 3 deletions(-)
>>>>>>>>>>>
>>>>>>>>>>> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
>>>>>>>>>>> index 3cee2ef3ac..a8db8bfd9c 100644
>>>>>>>>>>> --- a/hw/net/virtio-net.c
>>>>>>>>>>> +++ b/hw/net/virtio-net.c
>>>>>>>>>>> @@ -3743,9 +3743,7 @@ static void
>>>>>>>>>>> virtio_net_device_realize(DeviceState *dev, Error **errp)
>>>>>>>>>>>          n->net_conf.tx_queue_size =
>>>>>>>>>>> MIN(virtio_net_max_tx_queue_size(n),
>>>>>>>>>>>                                          n->net_conf.tx_queue_size);
>>>>>>>>>>> -    for (i = 0; i < n->max_queue_pairs; i++) {
>>>>>>>>>>> -        virtio_net_add_queue(n, i);
>>>>>>>>>>> -    }
>>>>>>>>>>> +    virtio_net_add_queue(n, 0);
>>>>>>>>>>>          n->ctrl_vq = virtio_add_queue(vdev, 64,
>>>>>>>>>>> virtio_net_handle_ctrl);
>>>>>>>>>>>          qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
>>>>>>>>>>
>>>>>>>>>> This change breaks virtio net migration when multiqueue is enabled.
>>>>>>>>>>
>>>>>>>>>> I think this is because virtqueues are half initialized after
>>>>>>>>>> migration : they are
>>>>>>>>>> initialized on guest side (kernel is using them) but not on QEMU
>>>>>>>>>> side (realized has only
>>>>>>>>>> initialized one). After migration, they are not initialized by the
>>>>>>>>>> call to
>>>>>>>>>> virtio_net_set_multiqueue() from virtio_net_set_features() because
>>>>>>>>>> virtio_get_num_queues()
>>>>>>>>>> reports already n->max_queue_pairs as this value is coming from
>>>>>>>>>> the source guest memory.
>>>>>>>>>>
>>>>>>>>>> I don't think we have a way to half-initialize a virtqueue (to
>>>>>>>>>> initialize them only on
>>>>>>>>>> QEMU side as they are already initialized on kernel side).
>>>>>>>>>>
>>>>>>>>>> I think this change should be reverted to fix the migration issue.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Moreover, if I look in the code of virtio_load() and
>>>>>>>>> virtio_add_queue() we can guess it's
>>>>>>>>> not correct to migrate a virtqueue that is not initialized on the
>>>>>>>>> destination side because
>>>>>>>>> fields like 'vdev->vq[i].handle_output' or 'vdev->vq[i].used_elems'
>>>>>>>>> cannot be initialized
>>>>>>>>> by virtio_load() and neither by virtio_add_queue() after
>>>>>>>>> virtio_load() as fields like
>>>>>>>>> 'vring.num' are already initialized by virtio_load().
>>>>>>>>>
>>>>>>>>> For instance, in virtio_load() we set:
>>>>>>>>>
>>>>>>>>>         for (i = 0; i < num; i++) {
>>>>>>>>>             vdev->vq[i].vring.num = qemu_get_be32(f);
>>>>>>>>>
>>>>>>>>> and in virtio_add_queue() we search for the firt available queue to
>>>>>>>>> add with:
>>>>>>>>>
>>>>>>>>>         for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
>>>>>>>>>             if (vdev->vq[i].vring.num == 0)
>>>>>>>>>                 break;
>>>>>>>>>         }
>>>>>>>>>
>>>>>>>>> So virtio_add_queue() cannot be used to set:
>>>>>>>>>
>>>>>>>>>         vdev->vq[i].handle_output = handle_output;
>>>>>>>>>         vdev->vq[i].used_elems = g_new0(VirtQueueElement, queue_size);
>>>>>>>>>
>>>>>>>>> Moreover it would overwrite fields already set by virtio_load():
>>>>>>>>>
>>>>>>>>>         vdev->vq[i].vring.num = queue_size;
>>>>>>>>>         vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
>>>>>>>>>
>>>>>>>>> It also explains why virtio_net_change_num_queue_pairs()
>>>>>>>>> (indirectly called by
>>>>>>>>> virtio_net_set_features()) doesn't update the queue pair numbers:
>>>>>>>>> vring.num is already set
>>>>>>>>> so it thinks there is no more queues to add.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> LAurent
>>>>>>>>>
>>>>>>>>
>>>>>>>> I agree.
>>>>>>>>
>>>>>>>> Laurent, would you like to send a patch to revert this?
>>>>>>>>
>>>>>>>
>>>>>>> Yes. I will also try to fix the leak in unrealize that the patch
>>>>>>> wanted to fix initially.
>>>>>>
>>>>>> I wrote a fix so I will submit it once internal testing is done. You
>>>>>> can see the change at:
>>>>>> https://gitlab.com/akihiko.odaki/qemu-kvm/-/
>>>>>> commit/22161221aa2d2031d7ad1be7701852083aa9109a
>>>>>
>>>>> It works fine for me but I don't know if it's a good idea to add queues
>>>>> while the state is loading.
>>>>
>>>> I couldn't come up with other options. The problem is that the number of
>>>> queues added during realization does not match with the loaded state. We
>>>> need to add queues after knowing the negotiated feature set and before
>>>> loading the queue states to fix this problem.
>>>>
>>>> Reverting will add queues that are used when the multiqueue feature is
>>>> negotiated so it will fix migration for such cases, but will also break
>>>> the other cases (i.e., the multiqueue feature is not negotiated) as it
>>>> adds too many queues.
>>>>
>>>> Regards,
>>>> Akihiko Odaki
>>>
>>> I wonder if the following is much more simpler:
>>>
>>> 1) introducing booleans whether the queue has been deleted
>>> 2) in unrelize, deleted only the queue that has not been deleted
>>
>> The memory leak problem is trivial to solve, but the problem with queue
>> state loading is not. We need to ensure the number of queues are
>> consistent with the number of loaded queues.
>>
>> We currently have too few queues if the multiqueue feature is
>> negotiated, which results in queues partially initialized with the
>> loaded state. Reverting will leave too many queues for the cases where
>> the multiqueue feature is not negotiated, which is also problematic
>> because virtio-net will reconfigure queues to reduce the number of
>> queues and dispose loaded states.
> 
> I'm not sure I would get here, if those queues were not visible to
> drivers. Why do we care?

We also need to reconfigure controlq, which is visible to drivers, and 
invalidate its loaded state. virtio_net_change_num_queue_pairs() has the 
following comment:
 > We always need to remove and add ctrl vq if
 > old_num_queues != new_num_queues. Remove ctrl_vq first,
 > and then we only enter one of the following two loops.

Regards,
Akihiko Odaki


^ permalink raw reply	[flat|nested] 42+ messages in thread

end of thread, other threads:[~2024-10-21  8:41 UTC | newest]

Thread overview: 42+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-06-04  7:37 [PULL 00/20] Net patches Jason Wang
2024-06-04  7:37 ` [PULL 01/20] tap: Remove tap_probe_vnet_hdr_len() Jason Wang
2024-06-04  7:37 ` [PULL 02/20] tap: Remove qemu_using_vnet_hdr() Jason Wang
2024-06-04  7:37 ` [PULL 03/20] net: Move virtio-net header length assertion Jason Wang
2024-06-04  7:37 ` [PULL 04/20] net: Remove receive_raw() Jason Wang
2024-06-04  7:37 ` [PULL 05/20] tap: Call tap_receive_iov() from tap_receive() Jason Wang
2024-06-04  7:37 ` [PULL 06/20] tap: Shrink zeroed virtio-net header Jason Wang
2024-06-04  7:37 ` [PULL 07/20] virtio-net: Do not propagate ebpf-rss-fds errors Jason Wang
2024-06-05 10:23   ` Daniel P. Berrangé
2024-06-05 20:14     ` Akihiko Odaki
2024-06-06  7:14       ` Daniel P. Berrangé
2024-06-06  7:19         ` Akihiko Odaki
2024-06-06  7:59           ` Daniel P. Berrangé
2024-06-07  6:04             ` Akihiko Odaki
2024-06-04  7:37 ` [PULL 08/20] virtio-net: Add only one queue pair when realizing Jason Wang
2024-10-14  8:30   ` Laurent Vivier
2024-10-14 15:16     ` Laurent Vivier
2024-10-17  6:59       ` Jason Wang
2024-10-17  7:32         ` Laurent Vivier
2024-10-17  9:07           ` Akihiko Odaki
2024-10-17  9:17             ` Laurent Vivier
2024-10-17  9:42               ` Akihiko Odaki
2024-10-18  4:50                 ` Jason Wang
2024-10-19 12:38                   ` Akihiko Odaki
2024-10-21  7:23                     ` Jason Wang
2024-10-21  8:40                       ` Akihiko Odaki
2024-06-04  7:37 ` [PULL 09/20] virtio-net: Copy header only when necessary Jason Wang
2024-06-04  7:37 ` [PULL 10/20] virtio-net: Shrink header byte swapping buffer Jason Wang
2024-06-04  7:37 ` [PULL 11/20] virtio-net: Disable RSS on reset Jason Wang
2024-06-04  7:37 ` [PULL 12/20] virtio-net: Unify the logic to update NIC state for RSS Jason Wang
2024-06-04  7:37 ` [PULL 13/20] virtio-net: Always set populate_hash Jason Wang
2024-06-04  7:37 ` [PULL 14/20] virtio-net: Do not write hashes to peer buffer Jason Wang
2024-06-04  7:37 ` [PULL 15/20] ebpf: Fix RSS error handling Jason Wang
2024-06-04  7:37 ` [PULL 16/20] ebpf: Return 0 when configuration fails Jason Wang
2024-06-04  7:37 ` [PULL 17/20] ebpf: Refactor tun_rss_steering_prog() Jason Wang
2024-06-04  7:37 ` [PULL 18/20] ebpf: Add a separate target for skeleton Jason Wang
2024-06-04  7:37 ` [PULL 19/20] virtio-net: drop too short packets early Jason Wang
2024-06-04  7:37 ` [PULL 20/20] ebpf: Added traces back. Changed source set for eBPF to 'system' Jason Wang
2024-06-04 19:52 ` [PULL 00/20] Net patches Richard Henderson
2024-06-05 10:14 ` Michael Tokarev
2024-06-05 20:18   ` Akihiko Odaki
2024-06-06  0:13   ` Jason Wang

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