[PATCH v3 0/6] eBPF RSS through QMP support.

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* [PATCH v3 0/6] eBPF RSS through QMP support.
@ 2023-06-14 22:10 Andrew Melnychenko
  2023-06-14 22:10 ` [PATCH v3 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
                   ` (7 more replies)
  0 siblings, 8 replies; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

This series of patches provides the ability to retrieve eBPF program
through qmp, so management application may load bpf blob with proper capabilities.
Now, virtio-net devices can accept eBPF programs and maps through properties
as external file descriptors. Access to the eBPF map is direct through mmap()
call, so it should not require additional capabilities to bpf* calls.
eBPF file descriptors can be passed to QEMU from parent process or by unix
socket with sendfd() qmp command.

Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)

Changes since v2:
 * moved/refactored QMP command
 * refactored virtio-net

Changes since v1:
 * refactored virtio-net
 * moved hunks for ebpf mmap()
 * added qmp enum for eBPF id.

Andrew Melnychenko (6):
  ebpf: Added eBPF map update through mmap.
  ebpf: Added eBPF initialization by fds.
  virtio-net: Added property to load eBPF RSS with fds.
  ebpf: Added declaration/initialization routines.
  qmp: Added new command to retrieve eBPF blob.
  ebpf: Updated eBPF program and skeleton.

 ebpf/ebpf.c                    |   70 ++
 ebpf/ebpf.h                    |   31 +
 ebpf/ebpf_rss-stub.c           |    6 +
 ebpf/ebpf_rss.c                |  150 +++-
 ebpf/ebpf_rss.h                |   10 +
 ebpf/meson.build               |    2 +-
 ebpf/rss.bpf.skeleton.h        | 1469 ++++++++++++++++----------------
 hw/net/virtio-net.c            |   55 +-
 include/hw/virtio/virtio-net.h |    1 +
 qapi/ebpf.json                 |   55 ++
 qapi/meson.build               |    1 +
 qapi/qapi-schema.json          |    1 +
 tools/ebpf/rss.bpf.c           |    2 +-
 13 files changed, 1093 insertions(+), 760 deletions(-)
 create mode 100644 ebpf/ebpf.c
 create mode 100644 ebpf/ebpf.h
 create mode 100644 qapi/ebpf.json

-- 
2.39.1

^ permalink raw reply	[flat|nested] 21+ messages in thread

* [PATCH v3 1/6] ebpf: Added eBPF map update through mmap.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
@ 2023-06-14 22:10 ` Andrew Melnychenko
  2023-06-21  7:58   ` Daniel P. Berrangé
  2023-06-14 22:10 ` [PATCH v3 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
                   ` (6 subsequent siblings)
  7 siblings, 1 reply; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

Changed eBPF map updates through mmaped array.
Mmaped arrays provide direct access to map data.
It should omit using bpf_map_update_elem() call,
which may require capabilities that are not present.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 ebpf/ebpf_rss.c | 117 ++++++++++++++++++++++++++++++++++++++----------
 ebpf/ebpf_rss.h |   5 +++
 2 files changed, 99 insertions(+), 23 deletions(-)

diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index cee658c158b..247f5eee1b6 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -27,19 +27,83 @@ void ebpf_rss_init(struct EBPFRSSContext *ctx)
 {
     if (ctx != NULL) {
         ctx->obj = NULL;
+        ctx->program_fd = -1;
+        ctx->map_configuration = -1;
+        ctx->map_toeplitz_key = -1;
+        ctx->map_indirections_table = -1;
+
+        ctx->mmap_configuration = NULL;
+        ctx->mmap_toeplitz_key = NULL;
+        ctx->mmap_indirections_table = NULL;
     }
 }
 
 bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
 {
-    return ctx != NULL && ctx->obj != NULL;
+    return ctx != NULL && (ctx->obj != NULL || ctx->program_fd != -1);
+}
+
+static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx)
+{
+    if (!ebpf_rss_is_loaded(ctx)) {
+        return false;
+    }
+
+    ctx->mmap_configuration = mmap(NULL, qemu_real_host_page_size(),
+                                   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;
+    }
+
+    return true;
+
+indirection_fail:
+    munmap(ctx->mmap_toeplitz_key, qemu_real_host_page_size());
+toeplitz_fail:
+    munmap(ctx->mmap_configuration, qemu_real_host_page_size());
+
+    ctx->mmap_configuration = NULL;
+    ctx->mmap_toeplitz_key = NULL;
+    ctx->mmap_indirections_table = NULL;
+    return false;
+}
+
+static void ebpf_rss_munmap(struct EBPFRSSContext *ctx)
+{
+    if (!ebpf_rss_is_loaded(ctx)) {
+        return;
+    }
+
+    munmap(ctx->mmap_indirections_table, qemu_real_host_page_size());
+    munmap(ctx->mmap_toeplitz_key, qemu_real_host_page_size());
+    munmap(ctx->mmap_configuration, qemu_real_host_page_size());
+
+    ctx->mmap_configuration = NULL;
+    ctx->mmap_toeplitz_key = NULL;
+    ctx->mmap_indirections_table = NULL;
 }
 
 bool ebpf_rss_load(struct EBPFRSSContext *ctx)
 {
     struct rss_bpf *rss_bpf_ctx;
 
-    if (ctx == NULL) {
+    if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
         return false;
     }
 
@@ -66,10 +130,18 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
     ctx->map_toeplitz_key = bpf_map__fd(
             rss_bpf_ctx->maps.tap_rss_map_toeplitz_key);
 
+    if (!ebpf_rss_mmap(ctx)) {
+        goto error;
+    }
+
     return true;
 error:
     rss_bpf__destroy(rss_bpf_ctx);
     ctx->obj = NULL;
+    ctx->program_fd = -1;
+    ctx->map_configuration = -1;
+    ctx->map_toeplitz_key = -1;
+    ctx->map_indirections_table = -1;
 
     return false;
 }
@@ -77,15 +149,11 @@ error:
 static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
                                 struct EBPFRSSConfig *config)
 {
-    uint32_t map_key = 0;
-
     if (!ebpf_rss_is_loaded(ctx)) {
         return false;
     }
-    if (bpf_map_update_elem(ctx->map_configuration,
-                            &map_key, config, 0) < 0) {
-        return false;
-    }
+
+    memcpy(ctx->mmap_configuration, config, sizeof(*config));
     return true;
 }
 
@@ -93,27 +161,19 @@ static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
                                             uint16_t *indirections_table,
                                             size_t len)
 {
-    uint32_t i = 0;
-
     if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
        len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
         return false;
     }
 
-    for (; i < len; ++i) {
-        if (bpf_map_update_elem(ctx->map_indirections_table, &i,
-                                indirections_table + i, 0) < 0) {
-            return false;
-        }
-    }
+    memcpy(ctx->mmap_indirections_table, indirections_table,
+            sizeof(*indirections_table) * len);
     return true;
 }
 
 static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
                                      uint8_t *toeplitz_key)
 {
-    uint32_t map_key = 0;
-
     /* prepare toeplitz key */
     uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {};
 
@@ -123,10 +183,7 @@ static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
     memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE);
     *(uint32_t *)toe = ntohl(*(uint32_t *)toe);
 
-    if (bpf_map_update_elem(ctx->map_toeplitz_key, &map_key, toe,
-                            0) < 0) {
-        return false;
-    }
+    memcpy(ctx->mmap_toeplitz_key, toe, VIRTIO_NET_RSS_MAX_KEY_SIZE);
     return true;
 }
 
@@ -160,6 +217,20 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
         return;
     }
 
-    rss_bpf__destroy(ctx->obj);
+    ebpf_rss_munmap(ctx);
+
+    if (ctx->obj) {
+        rss_bpf__destroy(ctx->obj);
+    } else {
+        close(ctx->program_fd);
+        close(ctx->map_configuration);
+        close(ctx->map_toeplitz_key);
+        close(ctx->map_indirections_table);
+    }
+
     ctx->obj = NULL;
+    ctx->program_fd = -1;
+    ctx->map_configuration = -1;
+    ctx->map_toeplitz_key = -1;
+    ctx->map_indirections_table = -1;
 }
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
index bf3f2572c7c..ab08a7266d0 100644
--- a/ebpf/ebpf_rss.h
+++ b/ebpf/ebpf_rss.h
@@ -20,6 +20,11 @@ struct EBPFRSSContext {
     int map_configuration;
     int map_toeplitz_key;
     int map_indirections_table;
+
+    /* mapped eBPF maps for direct access to omit bpf_map_update_elem() */
+    void *mmap_configuration;
+    void *mmap_toeplitz_key;
+    void *mmap_indirections_table;
 };
 
 struct EBPFRSSConfig {
-- 
2.39.1



^ permalink raw reply related	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 1/6] ebpf: Added eBPF map update through mmap.
  2023-06-14 22:10 ` [PATCH v3 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
@ 2023-06-21  7:58   ` Daniel P. Berrangé
  0 siblings, 0 replies; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-21  7:58 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 01:10:21AM +0300, Andrew Melnychenko wrote:
> Changed eBPF map updates through mmaped array.
> Mmaped arrays provide direct access to map data.
> It should omit using bpf_map_update_elem() call,
> which may require capabilities that are not present.
> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  ebpf/ebpf_rss.c | 117 ++++++++++++++++++++++++++++++++++++++----------
>  ebpf/ebpf_rss.h |   5 +++
>  2 files changed, 99 insertions(+), 23 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


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] 21+ messages in thread

* [PATCH v3 2/6] ebpf: Added eBPF initialization by fds.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
  2023-06-14 22:10 ` [PATCH v3 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
@ 2023-06-14 22:10 ` Andrew Melnychenko
  2023-06-21  7:58   ` Daniel P. Berrangé
  2023-06-14 22:10 ` [PATCH v3 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
                   ` (5 subsequent siblings)
  7 siblings, 1 reply; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

It allows using file descriptors of eBPF provided
outside of QEMU.
QEMU may be run without capabilities for eBPF and run
RSS program provided by management tool(g.e. libvirt).

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 ebpf/ebpf_rss-stub.c |  6 ++++++
 ebpf/ebpf_rss.c      | 27 +++++++++++++++++++++++++++
 ebpf/ebpf_rss.h      |  5 +++++
 3 files changed, 38 insertions(+)

diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
index e71e229190d..8d7fae2ad92 100644
--- a/ebpf/ebpf_rss-stub.c
+++ b/ebpf/ebpf_rss-stub.c
@@ -28,6 +28,12 @@ bool ebpf_rss_load(struct EBPFRSSContext *ctx)
     return false;
 }
 
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+                       int config_fd, int toeplitz_fd, int table_fd)
+{
+    return false;
+}
+
 bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
                       uint16_t *indirections_table, uint8_t *toeplitz_key)
 {
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 247f5eee1b6..24bc6cc409e 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -146,6 +146,33 @@ error:
     return false;
 }
 
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+                       int config_fd, int toeplitz_fd, int table_fd)
+{
+    if (ctx == NULL || ebpf_rss_is_loaded(ctx)) {
+        return false;
+    }
+
+    if (program_fd < 0 || config_fd < 0 || toeplitz_fd < 0 || table_fd < 0) {
+        return false;
+    }
+
+    ctx->program_fd = program_fd;
+    ctx->map_configuration = config_fd;
+    ctx->map_toeplitz_key = toeplitz_fd;
+    ctx->map_indirections_table = table_fd;
+
+    if (!ebpf_rss_mmap(ctx)) {
+        ctx->program_fd = -1;
+        ctx->map_configuration = -1;
+        ctx->map_toeplitz_key = -1;
+        ctx->map_indirections_table = -1;
+        return false;
+    }
+
+    return true;
+}
+
 static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
                                 struct EBPFRSSConfig *config)
 {
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
index ab08a7266d0..239242b0d26 100644
--- a/ebpf/ebpf_rss.h
+++ b/ebpf/ebpf_rss.h
@@ -14,6 +14,8 @@
 #ifndef QEMU_EBPF_RSS_H
 #define QEMU_EBPF_RSS_H
 
+#define EBPF_RSS_MAX_FDS 4
+
 struct EBPFRSSContext {
     void *obj;
     int program_fd;
@@ -41,6 +43,9 @@ bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx);
 
 bool ebpf_rss_load(struct EBPFRSSContext *ctx);
 
+bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
+                       int config_fd, int toeplitz_fd, int table_fd);
+
 bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
                       uint16_t *indirections_table, uint8_t *toeplitz_key);
 
-- 
2.39.1



^ permalink raw reply related	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 2/6] ebpf: Added eBPF initialization by fds.
  2023-06-14 22:10 ` [PATCH v3 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
@ 2023-06-21  7:58   ` Daniel P. Berrangé
  0 siblings, 0 replies; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-21  7:58 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 01:10:22AM +0300, Andrew Melnychenko wrote:
> It allows using file descriptors of eBPF provided
> outside of QEMU.
> QEMU may be run without capabilities for eBPF and run
> RSS program provided by management tool(g.e. libvirt).
> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  ebpf/ebpf_rss-stub.c |  6 ++++++
>  ebpf/ebpf_rss.c      | 27 +++++++++++++++++++++++++++
>  ebpf/ebpf_rss.h      |  5 +++++
>  3 files changed, 38 insertions(+)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


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] 21+ messages in thread

* [PATCH v3 3/6] virtio-net: Added property to load eBPF RSS with fds.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
  2023-06-14 22:10 ` [PATCH v3 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
  2023-06-14 22:10 ` [PATCH v3 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
@ 2023-06-14 22:10 ` Andrew Melnychenko
  2023-06-21  8:01   ` Daniel P. Berrangé
  2023-06-14 22:10 ` [PATCH v3 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
                   ` (4 subsequent siblings)
  7 siblings, 1 reply; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

eBPF RSS program and maps may now be passed during initialization.
Initially was implemented for libvirt to launch qemu without permissions,
and initialized eBPF program through the helper.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 hw/net/virtio-net.c            | 55 ++++++++++++++++++++++++++++++----
 include/hw/virtio/virtio-net.h |  1 +
 2 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 6df6b7329d2..9a5443aaef1 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -42,6 +42,7 @@
 #include "sysemu/sysemu.h"
 #include "trace.h"
 #include "monitor/qdev.h"
+#include "monitor/monitor.h"
 #include "hw/pci/pci_device.h"
 #include "net_rx_pkt.h"
 #include "hw/virtio/vhost.h"
@@ -1304,14 +1305,55 @@ static void virtio_net_detach_epbf_rss(VirtIONet *n)
     virtio_net_attach_ebpf_to_backend(n->nic, -1);
 }
 
-static bool virtio_net_load_ebpf(VirtIONet *n)
+static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
 {
-    if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
-        /* backend does't support steering ebpf */
-        return false;
+    int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
+    int nfds = 0;
+    int ret = true;
+    int i = 0;
+    g_auto(GStrv) fds_strs = g_strsplit(n->ebpf_rss_fds, ":", 0);
+
+    ERRP_GUARD();
+
+    if (g_strv_length(fds_strs) != EBPF_RSS_MAX_FDS) {
+        error_setg(errp,
+                  "Expected %d file descriptors but got %d",
+                  EBPF_RSS_MAX_FDS, g_strv_length(fds_strs));
+       return false;
+   }
+
+    for (i = 0; i < nfds; i++) {
+        fds[i] = monitor_fd_param(monitor_cur(), fds_strs[i], errp);
+        if (*errp) {
+            ret = false;
+            goto exit;
+        }
+    }
+
+    ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
+
+exit:
+    if (!ret || *errp) {
+        for (i = 0; i < nfds && fds[i] != -1; i++) {
+            close(fds[i]);
+        }
     }
 
-    return ebpf_rss_load(&n->ebpf_rss);
+    return ret;
+}
+
+static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
+{
+    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))) {
+            ret = ebpf_rss_load(&n->ebpf_rss);
+        }
+    }
+
+    return ret;
 }
 
 static void virtio_net_unload_ebpf(VirtIONet *n)
@@ -3741,7 +3783,7 @@ 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);
+        virtio_net_load_ebpf(n, errp);
     }
 }
 
@@ -3903,6 +3945,7 @@ static Property virtio_net_properties[] = {
                     VIRTIO_NET_F_RSS, false),
     DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
                     VIRTIO_NET_F_HASH_REPORT, false),
+    DEFINE_PROP_STRING("ebpf_rss_fds", VirtIONet, ebpf_rss_fds),
     DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
                     VIRTIO_NET_F_RSC_EXT, false),
     DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index ef234ffe7ef..e10ce88f918 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -219,6 +219,7 @@ struct VirtIONet {
     VirtioNetRssData rss_data;
     struct NetRxPkt *rx_pkt;
     struct EBPFRSSContext ebpf_rss;
+    char *ebpf_rss_fds;
 };
 
 size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
-- 
2.39.1



^ permalink raw reply related	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 3/6] virtio-net: Added property to load eBPF RSS with fds.
  2023-06-14 22:10 ` [PATCH v3 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-06-21  8:01   ` Daniel P. Berrangé
  0 siblings, 0 replies; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-21  8:01 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 01:10:23AM +0300, Andrew Melnychenko wrote:
> eBPF RSS program and maps may now be passed during initialization.
> Initially was implemented for libvirt to launch qemu without permissions,
> and initialized eBPF program through the helper.
> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  hw/net/virtio-net.c            | 55 ++++++++++++++++++++++++++++++----
>  include/hw/virtio/virtio-net.h |  1 +
>  2 files changed, 50 insertions(+), 6 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


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] 21+ messages in thread

* [PATCH v3 4/6] ebpf: Added declaration/initialization routines.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
                   ` (2 preceding siblings ...)
  2023-06-14 22:10 ` [PATCH v3 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
@ 2023-06-14 22:10 ` Andrew Melnychenko
  2023-06-21  8:02   ` Daniel P. Berrangé
  2023-06-14 22:10 ` [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
                   ` (3 subsequent siblings)
  7 siblings, 1 reply; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

Now, the binary objects may be retrieved by id.
It would require for future qmp commands that may require specific
eBPF blob.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 ebpf/ebpf.c      | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
 ebpf/ebpf.h      | 31 +++++++++++++++++++++
 ebpf/ebpf_rss.c  |  6 +++++
 ebpf/meson.build |  2 +-
 4 files changed, 108 insertions(+), 1 deletion(-)
 create mode 100644 ebpf/ebpf.c
 create mode 100644 ebpf/ebpf.h

diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c
new file mode 100644
index 00000000000..ea97c0403ee
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,70 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-ebpf.h"
+#include "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+    int id;
+    const void *data;
+    size_t datalen;
+
+    QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+                                            QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(int id, const void *data, size_t datalen)
+{
+    struct ElfBinaryDataEntry *dataentry = NULL;
+
+    dataentry = g_new0(struct ElfBinaryDataEntry, 1);
+    dataentry->data = data;
+    dataentry->datalen = datalen;
+    dataentry->id = id;
+
+    QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, dataentry, node);
+}
+
+const void *ebpf_find_binary_by_id(int id, size_t *sz, Error **errp)
+{
+    struct ElfBinaryDataEntry *it = NULL;
+    QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+        if (id == it->id) {
+            *sz = it->datalen;
+            return it->data;
+        }
+    }
+
+    error_setg(errp, "can't find eBPF object with id: %d", id);
+
+    return NULL;
+}
+
+EbpfObject *qmp_request_ebpf(EbpfProgramID id, Error **errp)
+{
+    EbpfObject *ret = NULL;
+    size_t size = 0;
+    const void *data = ebpf_find_binary_by_id(id, &size, errp);
+    if (!data) {
+        return NULL;
+    }
+
+    ret = g_new0(EbpfObject, 1);
+    ret->object = g_base64_encode(data, size);
+
+    return ret;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 00000000000..b6266b28b8c
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,31 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#ifndef EBPF_H
+#define EBPF_H
+
+struct Error;
+
+void ebpf_register_binary_data(int id, const void *data,
+                               size_t datalen);
+const void *ebpf_find_binary_by_id(int id, size_t *sz,
+                                   struct Error **errp);
+
+#define ebpf_binary_init(id, fn)                                           \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void)     \
+{                                                                          \
+    size_t datalen = 0;                                                    \
+    const void *data = fn(&datalen);                                       \
+    ebpf_register_binary_data(id, data, datalen);                          \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 24bc6cc409e..8679dc452df 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -13,6 +13,8 @@
 
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
+#include "qapi/qapi-types-misc.h"
+#include "qapi/qapi-commands-ebpf.h"
 
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
@@ -21,6 +23,8 @@
 
 #include "ebpf/ebpf_rss.h"
 #include "ebpf/rss.bpf.skeleton.h"
+#include "ebpf/ebpf.h"
+
 #include "trace.h"
 
 void ebpf_rss_init(struct EBPFRSSContext *ctx)
@@ -261,3 +265,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
     ctx->map_toeplitz_key = -1;
     ctx->map_indirections_table = -1;
 }
+
+ebpf_binary_init(EBPF_PROGRAMID_RSS, rss_bpf__elf_bytes)
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2dd0fd89480..272ec2d5311 100644
--- a/ebpf/meson.build
+++ b/ebpf/meson.build
@@ -1 +1 @@
-softmmu_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
+softmmu_ss.add(when: libbpf, if_true: files('ebpf.c', 'ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
-- 
2.39.1



^ permalink raw reply related	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 4/6] ebpf: Added declaration/initialization routines.
  2023-06-14 22:10 ` [PATCH v3 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-06-21  8:02   ` Daniel P. Berrangé
  0 siblings, 0 replies; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-21  8:02 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 01:10:24AM +0300, Andrew Melnychenko wrote:
> Now, the binary objects may be retrieved by id.
> It would require for future qmp commands that may require specific
> eBPF blob.
> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  ebpf/ebpf.c      | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
>  ebpf/ebpf.h      | 31 +++++++++++++++++++++
>  ebpf/ebpf_rss.c  |  6 +++++
>  ebpf/meson.build |  2 +-
>  4 files changed, 108 insertions(+), 1 deletion(-)
>  create mode 100644 ebpf/ebpf.c
>  create mode 100644 ebpf/ebpf.h

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


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] 21+ messages in thread

* [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
                   ` (3 preceding siblings ...)
  2023-06-14 22:10 ` [PATCH v3 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
@ 2023-06-14 22:10 ` Andrew Melnychenko
  2023-06-21  8:02   ` Daniel P. Berrangé
  2023-07-07 11:45   ` Markus Armbruster
  2023-06-14 22:10 ` [PATCH v3 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
                   ` (2 subsequent siblings)
  7 siblings, 2 replies; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

Added command "request-ebpf". This command returns
eBPF program encoded base64. The program taken from the
skeleton and essentially is an ELF object that can be
loaded in the future with libbpf.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 qapi/ebpf.json        | 55 +++++++++++++++++++++++++++++++++++++++++++
 qapi/meson.build      |  1 +
 qapi/qapi-schema.json |  1 +
 3 files changed, 57 insertions(+)
 create mode 100644 qapi/ebpf.json

diff --git a/qapi/ebpf.json b/qapi/ebpf.json
new file mode 100644
index 00000000000..6f9a1f1a0c9
--- /dev/null
+++ b/qapi/ebpf.json
@@ -0,0 +1,55 @@
+# -*- Mode: Python -*-
+# vim: filetype=python
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+##
+# = Machines
+##
+
+{ 'include': 'common.json' }
+
+##
+# @EbpfObject:
+#
+# Structure that holds eBPF ELF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'struct': 'EbpfObject',
+  'data': {'object': 'str'} }
+
+##
+# @EbpfProgramID:
+#
+# An enumeration of the eBPF programs. Currently, only RSS is presented.
+# RSS - Receive side scaling, technology that allows steering traffic
+# between queues by calculation hash. Users may set up indirection table
+# and hash/packet types configurations. Used with virtio-net.
+#
+# Since: 8.1
+##
+{ 'enum': 'EbpfProgramID',
+  'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
+
+##
+# @request-ebpf:
+#
+# Returns eBPF object that can be loaded with libbpf.
+# Management applications (g.e. libvirt) may load it and pass file
+# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
+# It's crucial that eBPF program/map is compatible with QEMU, so it's
+# provided through QMP.
+#
+# Returns: RSS eBPF object encoded in base64.
+#
+# Since: 8.1
+#
+##
+{ 'command': 'request-ebpf',
+  'data': { 'id': 'EbpfProgramID' },
+  'returns': 'EbpfObject',
+  'if': 'CONFIG_EBPF' }
+
diff --git a/qapi/meson.build b/qapi/meson.build
index 9fd480c4d81..12a1cb1f9c2 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -52,6 +52,7 @@ qapi_all_modules = [
   'transaction',
   'virtio',
   'yank',
+  'ebpf',
 ]
 if have_system
   qapi_all_modules += [
diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
index 6594afba312..169cfe8d386 100644
--- a/qapi/qapi-schema.json
+++ b/qapi/qapi-schema.json
@@ -79,3 +79,4 @@
 { 'include': 'virtio.json' }
 { 'include': 'cryptodev.json' }
 { 'include': 'cxl.json' }
+{ 'include': 'ebpf.json' }
-- 
2.39.1



^ permalink raw reply related	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob.
  2023-06-14 22:10 ` [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-06-21  8:02   ` Daniel P. Berrangé
  2023-07-07 11:45   ` Markus Armbruster
  1 sibling, 0 replies; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-21  8:02 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 01:10:25AM +0300, Andrew Melnychenko wrote:
> Added command "request-ebpf". This command returns
> eBPF program encoded base64. The program taken from the
> skeleton and essentially is an ELF object that can be
> loaded in the future with libbpf.
> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  qapi/ebpf.json        | 55 +++++++++++++++++++++++++++++++++++++++++++
>  qapi/meson.build      |  1 +
>  qapi/qapi-schema.json |  1 +
>  3 files changed, 57 insertions(+)
>  create mode 100644 qapi/ebpf.json

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


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] 21+ messages in thread

* Re: [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob.
  2023-06-14 22:10 ` [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
  2023-06-21  8:02   ` Daniel P. Berrangé
@ 2023-07-07 11:45   ` Markus Armbruster
  2023-07-10 12:52     ` Andrew Melnichenko
  1 sibling, 1 reply; 21+ messages in thread
From: Markus Armbruster @ 2023-07-07 11:45 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, eblake, qemu-devel, berrange, yuri.benditovich,
	yan

Andrew Melnychenko <andrew@daynix.com> writes:

> Added command "request-ebpf". This command returns
> eBPF program encoded base64. The program taken from the
> skeleton and essentially is an ELF object that can be
> loaded in the future with libbpf.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>

In review of v2, I asked why we need to provide eBPF programs via QMP,
and not simply via the filesystem, like all the other build artifacts.
Daniel explained

    Fetching it from QEMU gives us a strong guarantee that the eBPF
    code actually matches the QEMU binary we're talking to, which is
    useful if you're dealing with RPMs which can be upgraded behind
    your back, or have multiple parallel installs of QEMU.

I asked to work this rationale into the QAPI schema doc comments and the
commit message.

Only the doc comments are updated in this version.  Please update the
commit message as well.

I remain unconvinced this justifies adding an entirely new transport.
If we want to guard against mismatch, we can do it the usual way: bake
the version into the build artifacts that must match, then check they
do.

Since I feel vetoing the change would overstep my authority as a QAPI
maintainer, I'm asking you to treat my objection as advice.

If you you elect not to follow my advice, I want you to describe the
path not chosen in the commit message.  I.e. briefly explain the need
for an exact version match, describe the ways to ensure it we
considered, and the reasons for your pick.

> ---
>  qapi/ebpf.json        | 55 +++++++++++++++++++++++++++++++++++++++++++
>  qapi/meson.build      |  1 +
>  qapi/qapi-schema.json |  1 +
>  3 files changed, 57 insertions(+)
>  create mode 100644 qapi/ebpf.json
>
> diff --git a/qapi/ebpf.json b/qapi/ebpf.json
> new file mode 100644
> index 00000000000..6f9a1f1a0c9
> --- /dev/null
> +++ b/qapi/ebpf.json
> @@ -0,0 +1,55 @@
> +# -*- Mode: Python -*-
> +# vim: filetype=python
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2 or later.
> +# See the COPYING file in the top-level directory.
> +
> +##
> +# = Machines

Copy-pasta :)

> +##
> +
> +{ 'include': 'common.json' }
> +
> +##
> +# @EbpfObject:
> +#
> +# Structure that holds eBPF ELF object encoded in base64.
> +#
> +# Since: 8.1
> +#
> +##
> +{ 'struct': 'EbpfObject',
> +  'data': {'object': 'str'} }
> +
> +##
> +# @EbpfProgramID:
> +#
> +# An enumeration of the eBPF programs. Currently, only RSS is presented.
> +# RSS - Receive side scaling, technology that allows steering traffic
> +# between queues by calculation hash. Users may set up indirection table
> +# and hash/packet types configurations. Used with virtio-net.

Let's stick to the common way to document enum members, like this:

   # The eBPF programs that can be gotten with request-ebpf.
   #
   # @rss: ...

> +#
> +# Since: 8.1
> +##
> +{ 'enum': 'EbpfProgramID',
> +  'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }

Uh, this makes just the member @rss conditional on CONFIG_EBPF.
Why not the entire enum?

> +
> +##
> +# @request-ebpf:
> +#
> +# Returns eBPF object that can be loaded with libbpf.
> +# Management applications (g.e. libvirt) may load it and pass file
> +# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
> +# It's crucial that eBPF program/map is compatible with QEMU, so it's
> +# provided through QMP.
> +#
> +# Returns: RSS eBPF object encoded in base64.
> +#
> +# Since: 8.1
> +#
> +##
> +{ 'command': 'request-ebpf',
> +  'data': { 'id': 'EbpfProgramID' },
> +  'returns': 'EbpfObject',
> +  'if': 'CONFIG_EBPF' }
> +
> diff --git a/qapi/meson.build b/qapi/meson.build
> index 9fd480c4d81..12a1cb1f9c2 100644
> --- a/qapi/meson.build
> +++ b/qapi/meson.build
> @@ -52,6 +52,7 @@ qapi_all_modules = [
>    'transaction',
>    'virtio',
>    'yank',
> +  'ebpf',

Keep this list alphabetically sorted, please.

>  ]
>  if have_system
>    qapi_all_modules += [
> diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
> index 6594afba312..169cfe8d386 100644
> --- a/qapi/qapi-schema.json
> +++ b/qapi/qapi-schema.json
> @@ -79,3 +79,4 @@
>  { 'include': 'virtio.json' }
>  { 'include': 'cryptodev.json' }
>  { 'include': 'cxl.json' }
> +{ 'include': 'ebpf.json' }

This puts it at the end of the QMP reference manual.  Is this the best
spot?



^ permalink raw reply	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob.
  2023-07-07 11:45   ` Markus Armbruster
@ 2023-07-10 12:52     ` Andrew Melnichenko
  0 siblings, 0 replies; 21+ messages in thread
From: Andrew Melnichenko @ 2023-07-10 12:52 UTC (permalink / raw)
  To: Markus Armbruster
  Cc: jasowang, mst, eblake, qemu-devel, berrange, yuri.benditovich,
	yan

Hi all,


On Fri, Jul 7, 2023 at 2:45 PM Markus Armbruster <armbru@redhat.com> wrote:
>
> Andrew Melnychenko <andrew@daynix.com> writes:
>
> > Added command "request-ebpf". This command returns
> > eBPF program encoded base64. The program taken from the
> > skeleton and essentially is an ELF object that can be
> > loaded in the future with libbpf.
> >
> > Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
>
> In review of v2, I asked why we need to provide eBPF programs via QMP,
> and not simply via the filesystem, like all the other build artifacts.
> Daniel explained
>
>     Fetching it from QEMU gives us a strong guarantee that the eBPF
>     code actually matches the QEMU binary we're talking to, which is
>     useful if you're dealing with RPMs which can be upgraded behind
>     your back, or have multiple parallel installs of QEMU.
>
> I asked to work this rationale into the QAPI schema doc comments and the
> commit message.
>
> Only the doc comments are updated in this version.  Please update the
> commit message as well.

Ah, my bad. I'll update the commit message in v4.

>
> I remain unconvinced this justifies adding an entirely new transport.
> If we want to guard against mismatch, we can do it the usual way: bake
> the version into the build artifacts that must match, then check they
> do.
>
> Since I feel vetoing the change would overstep my authority as a QAPI
> maintainer, I'm asking you to treat my objection as advice.
>
> If you you elect not to follow my advice, I want you to describe the
> path not chosen in the commit message.  I.e. briefly explain the need
> for an exact version match, describe the ways to ensure it we
> considered, and the reasons for your pick.

In the v1 of this feature, we tried to implement it using an
additional file including
the ebpf (ebpf helper) built together with QEMU. Unfortunately, during long v1
discussion it was found that this approach still leaves an open issue in case
of QEMU update when the running instance is present + later hotplug of
virtio-net device.
The existing approach (v2,v3,...) seems to solve all the problems with
little effort.
We'll document all the reasons in the commit message.
Thank you for the advice.

>
> > ---
> >  qapi/ebpf.json        | 55 +++++++++++++++++++++++++++++++++++++++++++
> >  qapi/meson.build      |  1 +
> >  qapi/qapi-schema.json |  1 +
> >  3 files changed, 57 insertions(+)
> >  create mode 100644 qapi/ebpf.json
> >
> > diff --git a/qapi/ebpf.json b/qapi/ebpf.json
> > new file mode 100644
> > index 00000000000..6f9a1f1a0c9
> > --- /dev/null
> > +++ b/qapi/ebpf.json
> > @@ -0,0 +1,55 @@
> > +# -*- Mode: Python -*-
> > +# vim: filetype=python
> > +#
> > +# This work is licensed under the terms of the GNU GPL, version 2 or later.
> > +# See the COPYING file in the top-level directory.
> > +
> > +##
> > +# = Machines
>
> Copy-pasta :)

Oh :3

>
> > +##
> > +
> > +{ 'include': 'common.json' }
> > +
> > +##
> > +# @EbpfObject:
> > +#
> > +# Structure that holds eBPF ELF object encoded in base64.
> > +#
> > +# Since: 8.1
> > +#
> > +##
> > +{ 'struct': 'EbpfObject',
> > +  'data': {'object': 'str'} }
> > +
> > +##
> > +# @EbpfProgramID:
> > +#
> > +# An enumeration of the eBPF programs. Currently, only RSS is presented.
> > +# RSS - Receive side scaling, technology that allows steering traffic
> > +# between queues by calculation hash. Users may set up indirection table
> > +# and hash/packet types configurations. Used with virtio-net.
>
> Let's stick to the common way to document enum members, like this:
>
>    # The eBPF programs that can be gotten with request-ebpf.
>    #
>    # @rss: ...
>

Ok, I'll update it.

> > +#
> > +# Since: 8.1
> > +##
> > +{ 'enum': 'EbpfProgramID',
> > +  'data': [ { 'name': 'rss', 'if': 'CONFIG_EBPF' } ] }
>
> Uh, this makes just the member @rss conditional on CONFIG_EBPF.
> Why not the entire enum?
>

I'll change it for entire enum.

> > +
> > +##
> > +# @request-ebpf:
> > +#
> > +# Returns eBPF object that can be loaded with libbpf.
> > +# Management applications (g.e. libvirt) may load it and pass file
> > +# descriptors to QEMU. Which allows running QEMU without BPF capabilities.
> > +# It's crucial that eBPF program/map is compatible with QEMU, so it's
> > +# provided through QMP.
> > +#
> > +# Returns: RSS eBPF object encoded in base64.
> > +#
> > +# Since: 8.1
> > +#
> > +##
> > +{ 'command': 'request-ebpf',
> > +  'data': { 'id': 'EbpfProgramID' },
> > +  'returns': 'EbpfObject',
> > +  'if': 'CONFIG_EBPF' }
> > +
> > diff --git a/qapi/meson.build b/qapi/meson.build
> > index 9fd480c4d81..12a1cb1f9c2 100644
> > --- a/qapi/meson.build
> > +++ b/qapi/meson.build
> > @@ -52,6 +52,7 @@ qapi_all_modules = [
> >    'transaction',
> >    'virtio',
> >    'yank',
> > +  'ebpf',
>
> Keep this list alphabetically sorted, please.
>

Ok!

> >  ]
> >  if have_system
> >    qapi_all_modules += [
> > diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
> > index 6594afba312..169cfe8d386 100644
> > --- a/qapi/qapi-schema.json
> > +++ b/qapi/qapi-schema.json
> > @@ -79,3 +79,4 @@
> >  { 'include': 'virtio.json' }
> >  { 'include': 'cryptodev.json' }
> >  { 'include': 'cxl.json' }
> > +{ 'include': 'ebpf.json' }
>
> This puts it at the end of the QMP reference manual.  Is this the best
> spot?
>

I think I'll put it next "net". Although, future eBPF programs can be
used not only for networks.
On the other hand, practical use of eBPF that I can come up with
related to the net, g.e. virtio/vhost net filters.


^ permalink raw reply	[flat|nested] 21+ messages in thread

* [PATCH v3 6/6] ebpf: Updated eBPF program and skeleton.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
                   ` (4 preceding siblings ...)
  2023-06-14 22:10 ` [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
@ 2023-06-14 22:10 ` Andrew Melnychenko
  2023-06-21  7:58   ` Daniel P. Berrangé
  2023-06-30  5:06 ` [PATCH v3 0/6] eBPF RSS through QMP support Jason Wang
  2023-06-30  6:59 ` Jason Wang
  7 siblings, 1 reply; 21+ messages in thread
From: Andrew Melnychenko @ 2023-06-14 22:10 UTC (permalink / raw)
  To: jasowang, mst, armbru, eblake, qemu-devel, berrange; +Cc: yuri.benditovich, yan

Updated section name, so libbpf should init/gues proper
program type without specifications during open/load.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++++++-------------------
 tools/ebpf/rss.bpf.c    |    2 +-
 2 files changed, 741 insertions(+), 730 deletions(-)

diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
index 18eb2adb12c..41b84aea44c 100644
--- a/ebpf/rss.bpf.skeleton.h
+++ b/ebpf/rss.bpf.skeleton.h
@@ -176,162 +176,162 @@ err:
 
 static inline const void *rss_bpf__elf_bytes(size_t *sz)
 {
-	*sz = 20440;
+	*sz = 20720;
 	return (const void *)"\
 \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\x98\x4c\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\
+\0\0\0\0\0\0\0\0\0\0\0\xb0\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\
 \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\x08\0\0\0\0\0\0\
-\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
-\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
-\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
-\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
-\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
-\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
-\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
-\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
-\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
+\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x64\x02\0\0\0\0\xbf\x87\0\0\
+\0\0\0\0\x15\x07\x62\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
+\0\x5b\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
+\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
+\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
+\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
+\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
+\xff\0\0\0\0\x15\x09\x4a\x02\0\0\0\0\x6b\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
+\0\x07\x03\0\0\xc8\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
 \x04\0\0\x02\0\0\0\xb7\x05\0\0\0\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\
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+\x77\0\0\0\x20\0\0\0\x55\0\x3f\x02\0\0\0\0\xb7\x02\0\0\x10\0\0\0\x69\xa1\xc8\
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-\0\xd0\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x04\0\0\x02\0\0\0\xb7\x05\0\0\0\0\0\
-\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x32\x02\0\
-\0\0\0\x69\xa1\xd0\xff\0\0\0\0\x15\x01\x30\x02\0\0\0\0\x7b\x7a\x38\xff\0\0\0\0\
-\x7b\x9a\x40\xff\0\0\0\0\x15\x01\x55\0\x86\xdd\0\0\x55\x01\x39\0\x08\0\0\0\xb7\
-\x07\0\0\x01\0\0\0\x73\x7a\x58\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xe0\xff\
-\0\0\0\0\x7b\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\
-\x07\x03\0\0\xd0\xff\xff\xff\x79\xa1\x40\xff\0\0\0\0\xb7\x02\0\0\0\0\0\0\xb7\
+\0\xc8\xff\xff\xff\xbf\x91\0\0\0\0\0\0\xb7\x04\0\0\x02\0\0\0\xb7\x05\0\0\0\0\0\
+\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x2f\x02\0\
+\0\0\0\x69\xa1\xc8\xff\0\0\0\0\x15\x01\x2d\x02\0\0\0\0\x7b\x7a\x30\xff\0\0\0\0\
+\x7b\x9a\x38\xff\0\0\0\0\x15\x01\x55\0\x86\xdd\0\0\x55\x01\x39\0\x08\0\0\0\xb7\
+\x07\0\0\x01\0\0\0\x73\x7a\x50\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xd8\xff\
+\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\x7b\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\
+\x07\x03\0\0\xc8\xff\xff\xff\x79\xa1\x38\xff\0\0\0\0\xb7\x02\0\0\0\0\0\0\xb7\
 \x04\0\0\x14\0\0\0\xb7\x05\0\0\x01\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\
-\0\x77\0\0\0\x20\0\0\0\x55\0\x1c\x02\0\0\0\0\x69\xa1\xd6\xff\0\0\0\0\x55\x01\
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-\0\0\x61\xa1\xe0\xff\0\0\0\0\x63\x1a\x68\xff\0\0\0\0\x71\xa9\xd9\xff\0\0\0\0\
-\x73\x7a\x5e\xff\0\0\0\0\x71\xa1\xd0\xff\0\0\0\0\x67\x01\0\0\x02\0\0\0\x57\x01\
-\0\0\x3c\0\0\0\x7b\x1a\x48\xff\0\0\0\0\xbf\x91\0\0\0\0\0\0\x57\x01\0\0\xff\0\0\
+\0\x77\0\0\0\x20\0\0\0\x55\0\x19\x02\0\0\0\0\x69\xa1\xce\xff\0\0\0\0\x55\x01\
+\x01\0\0\0\0\0\xb7\x07\0\0\0\0\0\0\x61\xa1\xd4\xff\0\0\0\0\x63\x1a\x5c\xff\0\0\
+\0\0\x61\xa1\xd8\xff\0\0\0\0\x63\x1a\x60\xff\0\0\0\0\x71\xa9\xd1\xff\0\0\0\0\
+\x73\x7a\x56\xff\0\0\0\0\x71\xa1\xc8\xff\0\0\0\0\x67\x01\0\0\x02\0\0\0\x57\x01\
+\0\0\x3c\0\0\0\x7b\x1a\x40\xff\0\0\0\0\xbf\x91\0\0\0\0\0\0\x57\x01\0\0\xff\0\0\
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-\0\0\0\x73\x1a\x5b\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xe0\xff\0\0\0\0\x7b\
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+\xc8\xff\xff\xff\x79\xa1\x38\xff\0\0\0\0\x79\xa2\x40\xff\0\0\0\0\xb7\x04\0\0\
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-\0\0\0\0\x63\x1a\xa8\xff\0\0\0\0\x61\xa1\x68\xff\0\0\0\0\x63\x1a\xac\xff\0\0\0\
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-\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\x1a\xf0\xff\0\0\0\0\x7b\x1a\xe8\xff\0\0\0\
-\0\x7b\x1a\xe0\xff\0\0\0\0\x7b\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\xbf\
-\xa3\0\0\0\0\0\0\x07\x03\0\0\xd0\xff\xff\xff\xb7\x01\0\0\x28\0\0\0\x7b\x1a\x48\
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+\x12\0\0\0\0\0\0\x57\x02\0\0\x02\0\0\0\x15\x02\x09\x01\0\0\0\0\x61\xa1\x5c\xff\
+\0\0\0\0\x63\x1a\xa0\xff\0\0\0\0\x61\xa1\x60\xff\0\0\0\0\x63\x1a\xa4\xff\0\0\0\
+\0\x69\xa1\x58\xff\0\0\0\0\x6b\x1a\xa8\xff\0\0\0\0\x69\xa1\x5a\xff\0\0\0\0\x6b\
+\x1a\xaa\xff\0\0\0\0\x05\0\x6b\x01\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x51\
+\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\x1a\xe8\xff\0\0\0\0\x7b\x1a\xe0\xff\0\0\0\
+\0\x7b\x1a\xd8\xff\0\0\0\0\x7b\x1a\xd0\xff\0\0\0\0\x7b\x1a\xc8\xff\0\0\0\0\xbf\
+\xa3\0\0\0\0\0\0\x07\x03\0\0\xc8\xff\xff\xff\xb7\x01\0\0\x28\0\0\0\x7b\x1a\x40\
 \xff\0\0\0\0\xbf\x91\0\0\0\0\0\0\xb7\x02\0\0\0\0\0\0\xb7\x04\0\0\x28\0\0\0\xb7\
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 \0\0\x61\x14\x08\0\0\0\0\0\x61\x11\x0c\0\0\0\0\0\x67\x01\0\0\x20\0\0\0\x4f\x41\
-\0\0\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x0f\x23\0\0\0\0\0\0\x61\x31\0\0\0\0\0\0\
-\x61\x32\x04\0\0\0\0\0\x61\x34\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x69\xa5\x62\
-\xff\0\0\0\0\x6b\x5a\xca\xff\0\0\0\0\x69\xa5\x60\xff\0\0\0\0\x6b\x5a\xc8\xff\0\
-\0\0\0\x67\x03\0\0\x20\0\0\0\x4f\x43\0\0\0\0\0\0\x7b\x3a\xc0\xff\0\0\0\0\x67\
-\x02\0\0\x20\0\0\0\x4f\x12\0\0\0\0\0\0\x7b\x2a\xb8\xff\0\0\0\0\x05\0\x6b\0\0\0\
-\0\0\x71\xa2\x5a\xff\0\0\0\0\x15\x02\x04\0\0\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\
+\0\0\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x0f\x23\0\0\0\0\0\0\x61\x31\0\0\0\0\0\0\
+\x61\x32\x04\0\0\0\0\0\x61\x34\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x69\xa5\x5a\
+\xff\0\0\0\0\x6b\x5a\xc2\xff\0\0\0\0\x69\xa5\x58\xff\0\0\0\0\x6b\x5a\xc0\xff\0\
+\0\0\0\x67\x03\0\0\x20\0\0\0\x4f\x43\0\0\0\0\0\0\x7b\x3a\xb8\xff\0\0\0\0\x67\
+\x02\0\0\x20\0\0\0\x4f\x12\0\0\0\0\0\0\x7b\x2a\xb0\xff\0\0\0\0\x05\0\x6b\0\0\0\
+\0\0\x71\xa2\x52\xff\0\0\0\0\x15\x02\x04\0\0\0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\
 \0\0\x04\0\0\0\x15\x02\x01\0\0\0\0\0\x05\0\xf1\xfe\0\0\0\0\x57\x01\0\0\x01\0\0\
-\0\x15\x01\xd0\0\0\0\0\0\x61\xa1\x64\xff\0\0\0\0\x63\x1a\xa8\xff\0\0\0\0\x61\
-\xa1\x68\xff\0\0\0\0\x63\x1a\xac\xff\0\0\0\0\x05\0\x5e\0\0\0\0\0\xb7\x09\0\0\
-\x3c\0\0\0\x79\xa8\x28\xff\0\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x15\
-\0\xac\xff\0\0\0\0\x05\0\xc5\0\0\0\0\0\x71\xa2\x5a\xff\0\0\0\0\x15\x02\x26\0\0\
+\0\x15\x01\xcd\0\0\0\0\0\x61\xa1\x5c\xff\0\0\0\0\x63\x1a\xa0\xff\0\0\0\0\x61\
+\xa1\x60\xff\0\0\0\0\x63\x1a\xa4\xff\0\0\0\0\x05\0\x5e\0\0\0\0\0\xb7\x09\0\0\
+\x3c\0\0\0\x79\xa8\x20\xff\0\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x15\
+\0\xac\xff\0\0\0\0\x05\0\xc2\0\0\0\0\0\x71\xa2\x52\xff\0\0\0\0\x15\x02\x26\0\0\
 \0\0\0\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x20\0\0\0\x15\x02\x23\0\0\0\0\0\x57\x01\
 \0\0\0\x01\0\0\xb7\x02\0\0\x10\0\0\0\xb7\x03\0\0\x10\0\0\0\x15\x01\x01\0\0\0\0\
-\0\xb7\x03\0\0\x30\0\0\0\x71\xa4\x5d\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\
-\0\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x64\xff\xff\xff\xbf\x34\0\0\0\0\0\
-\0\x15\x01\x02\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\x84\xff\xff\xff\x71\
-\xa5\x5c\xff\0\0\0\0\xbf\x31\0\0\0\0\0\0\x15\x05\xbd\xff\0\0\0\0\x05\0\xbb\xff\
-\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x5a\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\
-\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\xd0\xff\xff\xff\x79\xa1\
-\x40\xff\0\0\0\0\x79\xa2\x48\xff\0\0\0\0\xb7\x04\0\0\x08\0\0\0\xb7\x05\0\0\x01\
-\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\xa0\0\
+\0\xb7\x03\0\0\x30\0\0\0\x71\xa4\x55\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\
+\0\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x5c\xff\xff\xff\xbf\x34\0\0\0\0\0\
+\0\x15\x01\x02\0\0\0\0\0\xbf\xa4\0\0\0\0\0\0\x07\x04\0\0\x7c\xff\xff\xff\x71\
+\xa5\x54\xff\0\0\0\0\xbf\x31\0\0\0\0\0\0\x15\x05\xbd\xff\0\0\0\0\x05\0\xbb\xff\
+\0\0\0\0\xb7\x01\0\0\x01\0\0\0\x73\x1a\x52\xff\0\0\0\0\xb7\x01\0\0\0\0\0\0\x7b\
+\x1a\xc8\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\xc8\xff\xff\xff\x79\xa1\
+\x38\xff\0\0\0\0\x79\xa2\x40\xff\0\0\0\0\xb7\x04\0\0\x08\0\0\0\xb7\x05\0\0\x01\
+\0\0\0\x85\0\0\0\x44\0\0\0\x67\0\0\0\x20\0\0\0\x77\0\0\0\x20\0\0\0\x55\0\x9d\0\
 \0\0\0\0\x05\0\xa8\xfe\0\0\0\0\x15\x09\xf3\xfe\x87\0\0\0\x05\0\x83\xff\0\0\0\0\
-\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x08\0\0\0\x15\x02\x9a\0\0\0\0\0\x57\x01\0\0\
+\xbf\x12\0\0\0\0\0\0\x57\x02\0\0\x08\0\0\0\x15\x02\x97\0\0\0\0\0\x57\x01\0\0\
 \x40\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\x03\0\0\x0c\0\0\0\x15\x01\x01\0\0\0\0\0\
-\xb7\x03\0\0\x2c\0\0\0\x71\xa4\x5c\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\
-\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x58\xff\xff\xff\x0f\x23\0\0\0\0\0\0\
+\xb7\x03\0\0\x2c\0\0\0\x71\xa4\x54\xff\0\0\0\0\x15\x04\x01\0\0\0\0\0\xbf\x32\0\
+\0\0\0\0\0\xbf\xa3\0\0\0\0\0\0\x07\x03\0\0\x50\xff\xff\xff\x0f\x23\0\0\0\0\0\0\
 \x61\x32\x04\0\0\0\0\0\x67\x02\0\0\x20\0\0\0\x61\x34\0\0\0\0\0\0\x4f\x42\0\0\0\
-\0\0\0\x7b\x2a\xa8\xff\0\0\0\0\x61\x32\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x67\
-\x03\0\0\x20\0\0\0\x4f\x23\0\0\0\0\0\0\x7b\x3a\xb0\xff\0\0\0\0\x71\xa2\x5d\xff\
-\0\0\0\0\x15\x02\x0c\0\0\0\0\0\x15\x01\x0b\0\0\0\0\0\x61\xa1\xa0\xff\0\0\0\0\
-\x67\x01\0\0\x20\0\0\0\x61\xa2\x9c\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xc0\
-\xff\0\0\0\0\x61\xa1\x98\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x94\xff\0\0\
+\0\0\0\x7b\x2a\xa0\xff\0\0\0\0\x61\x32\x08\0\0\0\0\0\x61\x33\x0c\0\0\0\0\0\x67\
+\x03\0\0\x20\0\0\0\x4f\x23\0\0\0\0\0\0\x7b\x3a\xa8\xff\0\0\0\0\x71\xa2\x55\xff\
+\0\0\0\0\x15\x02\x0c\0\0\0\0\0\x15\x01\x0b\0\0\0\0\0\x61\xa1\x98\xff\0\0\0\0\
+\x67\x01\0\0\x20\0\0\0\x61\xa2\x94\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb8\
+\xff\0\0\0\0\x61\xa1\x90\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x8c\xff\0\0\
 \0\0\x05\0\x0a\0\0\0\0\0\xb7\x09\0\0\x2b\0\0\0\x05\0\xae\xff\0\0\0\0\x61\xa1\
-\x80\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x7c\xff\0\0\0\0\x4f\x21\0\0\0\0\
-\0\0\x7b\x1a\xc0\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\
-\xa2\x74\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\xb7\x02\0\0\0\
+\x78\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\xa2\x74\xff\0\0\0\0\x4f\x21\0\0\0\0\
+\0\0\x7b\x1a\xb8\xff\0\0\0\0\x61\xa1\x70\xff\0\0\0\0\x67\x01\0\0\x20\0\0\0\x61\
+\xa2\x6c\xff\0\0\0\0\x4f\x21\0\0\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\xb7\x02\0\0\0\
 \0\0\0\x07\x08\0\0\x04\0\0\0\x61\x03\0\0\0\0\0\0\xb7\x05\0\0\0\0\0\0\xbf\xa1\0\
-\0\0\0\0\0\x07\x01\0\0\xa8\xff\xff\xff\x0f\x21\0\0\0\0\0\0\x71\x14\0\0\0\0\0\0\
+\0\0\0\0\0\x07\x01\0\0\xa0\xff\xff\xff\x0f\x21\0\0\0\0\0\0\x71\x14\0\0\0\0\0\0\
 \xbf\x41\0\0\0\0\0\0\x67\x01\0\0\x38\0\0\0\xc7\x01\0\0\x3f\0\0\0\x5f\x31\0\0\0\
 \0\0\0\xaf\x51\0\0\0\0\0\0\xbf\x85\0\0\0\0\0\0\x0f\x25\0\0\0\0\0\0\x71\x55\0\0\
 \0\0\0\0\x67\x03\0\0\x01\0\0\0\xbf\x50\0\0\0\0\0\0\x77\0\0\0\x07\0\0\0\x4f\x03\
@@ -353,619 +353,630 @@ static inline const void *rss_bpf__elf_bytes(size_t *sz)
 \0\x57\0\0\0\x01\0\0\0\x67\x03\0\0\x01\0\0\0\x4f\x03\0\0\0\0\0\0\x57\x04\0\0\
 \x01\0\0\0\x87\x04\0\0\0\0\0\0\x5f\x34\0\0\0\0\0\0\xaf\x41\0\0\0\0\0\0\x57\x05\
 \0\0\x01\0\0\0\x67\x03\0\0\x01\0\0\0\x4f\x53\0\0\0\0\0\0\x07\x02\0\0\x01\0\0\0\
-\xbf\x15\0\0\0\0\0\0\x15\x02\x01\0\x24\0\0\0\x05\0\xa9\xff\0\0\0\0\xbf\x12\0\0\
-\0\0\0\0\x67\x02\0\0\x20\0\0\0\x77\x02\0\0\x20\0\0\0\x15\x02\x0e\0\0\0\0\0\x71\
-\x63\x06\0\0\0\0\0\x71\x64\x07\0\0\0\0\0\x67\x04\0\0\x08\0\0\0\x4f\x34\0\0\0\0\
-\0\0\x3f\x42\0\0\0\0\0\0\x2f\x42\0\0\0\0\0\0\x1f\x21\0\0\0\0\0\0\x63\x1a\x58\
-\xff\0\0\0\0\xbf\xa2\0\0\0\0\0\0\x07\x02\0\0\x58\xff\xff\xff\x18\x01\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\x55\0\x05\0\0\0\0\0\x71\x61\x08\0\0\0\0\
-\0\x71\x60\x09\0\0\0\0\0\x67\0\0\0\x08\0\0\0\x4f\x10\0\0\0\0\0\0\x95\0\0\0\0\0\
-\0\0\x69\0\0\0\0\0\0\0\x05\0\xfd\xff\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\xbf\x15\0\0\0\0\0\0\x15\x02\x01\0\x24\0\0\0\x05\0\xa9\xff\0\0\0\0\x67\x01\0\0\
+\x20\0\0\0\x77\x01\0\0\x20\0\0\0\x15\x01\x0c\0\0\0\0\0\x71\x62\x06\0\0\0\0\0\
+\x71\x63\x07\0\0\0\0\0\x67\x03\0\0\x08\0\0\0\x4f\x23\0\0\0\0\0\0\x9f\x31\0\0\0\
+\0\0\0\x63\x1a\x50\xff\0\0\0\0\xbf\xa2\0\0\0\0\0\0\x07\x02\0\0\x50\xff\xff\xff\
+\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\x55\0\x05\0\0\0\0\0\
+\x71\x61\x08\0\0\0\0\0\x71\x60\x09\0\0\0\0\0\x67\0\0\0\x08\0\0\0\x4f\x10\0\0\0\
+\0\0\0\x95\0\0\0\0\0\0\0\x69\0\0\0\0\0\0\0\x05\0\xfd\xff\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\0\0\0\0\0\0\0\
-\0\x47\x50\x4c\x20\x76\x32\0\0\x9f\xeb\x01\0\x18\0\0\0\0\0\0\0\x10\x05\0\0\x10\
-\x05\0\0\x65\x11\0\0\0\0\0\0\0\0\0\x02\x03\0\0\0\x01\0\0\0\0\0\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\0\0\0\x05\0\0\0\
-\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\x02\x06\0\0\0\0\0\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\0\0\0\0\0\0\0\0\
-\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x0a\0\0\0\0\0\0\0\0\0\0\x02\x0a\0\0\0\0\0\0\0\
-\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x01\0\0\0\0\0\0\0\x04\0\0\x04\x20\0\0\0\
-\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\x05\0\0\0\x40\0\0\0\x27\0\0\0\x07\0\0\0\
-\x80\0\0\0\x32\0\0\0\x09\0\0\0\xc0\0\0\0\x3e\0\0\0\0\0\0\x0e\x0b\0\0\0\x01\0\0\
-\0\0\0\0\0\0\0\0\x02\x0e\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\
-\x28\0\0\0\0\0\0\0\x04\0\0\x04\x20\0\0\0\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\
-\x05\0\0\0\x40\0\0\0\x27\0\0\0\x0d\0\0\0\x80\0\0\0\x32\0\0\0\x09\0\0\0\xc0\0\0\
-\0\x59\0\0\0\0\0\0\x0e\x0f\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\x02\x12\0\0\0\0\0\0\0\
-\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x80\0\0\0\0\0\0\0\x04\0\0\x04\x20\0\0\0\
-\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\x05\0\0\0\x40\0\0\0\x27\0\0\0\x01\0\0\0\
-\x80\0\0\0\x32\0\0\0\x11\0\0\0\xc0\0\0\0\x72\0\0\0\0\0\0\x0e\x13\0\0\0\x01\0\0\
-\0\0\0\0\0\0\0\0\x02\x16\0\0\0\x90\0\0\0\x22\0\0\x04\xc0\0\0\0\x9a\0\0\0\x17\0\
-\0\0\0\0\0\0\x9e\0\0\0\x17\0\0\0\x20\0\0\0\xa7\0\0\0\x17\0\0\0\x40\0\0\0\xac\0\
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-\x60\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\x88\0\0\0\
-\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x80\x14\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\xc2\0\0\0\x01\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x88\x14\0\0\0\0\0\0\x8d\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\xbe\0\0\0\x09\0\0\0\x40\0\0\0\0\0\0\0\
-\0\0\0\0\0\0\0\0\x70\x3d\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\x18\x2b\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\xb0\
-\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\x79\0\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x20\
-\x4a\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\xb6\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xb8\x37\0\0\0\0\0\0\
-\x88\x05\0\0\0\0\0\0\x01\0\0\0\x36\0\0\0\x08\0\0\0\0\0\0\0\x18\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\x55\x4b\0\0\0\0\0\0\x5b\
+\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\xc8\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\xc0\x3d\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\x08\x14\0\0\0\0\0\0\x60\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\x68\x14\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\x70\x14\0\0\0\0\0\0\x89\
+\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\xf0\x3d\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\xfc\x2a\0\0\0\0\0\0\x50\x0d\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\x30\x3e\0\0\0\0\0\0\x20\x0d\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\x50\x4b\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\x50\x38\0\0\0\0\0\0\x70\x05\0\0\0\0\0\0\x01\0\0\0\x35\0\0\0\x08\0\0\0\
+\0\0\0\0\x18\0\0\0\0\0\0\0";
 }
 
 #ifdef __cplusplus
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index 20f227e2acc..d32b6fb42a4 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -528,7 +528,7 @@ static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
     return result;
 }
 
-SEC("tun_rss_steering")
+SEC("socket")
 int tun_rss_steering_prog(struct __sk_buff *skb)
 {
 
-- 
2.39.1



^ permalink raw reply related	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 6/6] ebpf: Updated eBPF program and skeleton.
  2023-06-14 22:10 ` [PATCH v3 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
@ 2023-06-21  7:58   ` Daniel P. Berrangé
  0 siblings, 0 replies; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-21  7:58 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: jasowang, mst, armbru, eblake, qemu-devel, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 01:10:26AM +0300, Andrew Melnychenko wrote:
> Updated section name, so libbpf should init/gues proper
> program type without specifications during open/load.
> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  ebpf/rss.bpf.skeleton.h | 1469 ++++++++++++++++++++-------------------
>  tools/ebpf/rss.bpf.c    |    2 +-
>  2 files changed, 741 insertions(+), 730 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


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] 21+ messages in thread

* Re: [PATCH v3 0/6] eBPF RSS through QMP support.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
                   ` (5 preceding siblings ...)
  2023-06-14 22:10 ` [PATCH v3 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
@ 2023-06-30  5:06 ` Jason Wang
  2023-06-30  8:04   ` Daniel P. Berrangé
  2023-06-30  6:59 ` Jason Wang
  7 siblings, 1 reply; 21+ messages in thread
From: Jason Wang @ 2023-06-30  5:06 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: mst, armbru, eblake, qemu-devel, berrange, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 6:29 AM Andrew Melnychenko <andrew@daynix.com> wrote:
>
> This series of patches provides the ability to retrieve eBPF program
> through qmp, so management application may load bpf blob with proper capabilities.
> Now, virtio-net devices can accept eBPF programs and maps through properties
> as external file descriptors. Access to the eBPF map is direct through mmap()
> call, so it should not require additional capabilities to bpf* calls.
> eBPF file descriptors can be passed to QEMU from parent process or by unix
> socket with sendfd() qmp command.
>
> Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
>
> Changes since v2:
>  * moved/refactored QMP command
>  * refactored virtio-net

I've queued this series, but a question left:

mmap() support for eBPF maps is not supported from day0, should we
fallback to syscall for the OS that doesn't support that?

Thanks

>
> Changes since v1:
>  * refactored virtio-net
>  * moved hunks for ebpf mmap()
>  * added qmp enum for eBPF id.
>
> Andrew Melnychenko (6):
>   ebpf: Added eBPF map update through mmap.
>   ebpf: Added eBPF initialization by fds.
>   virtio-net: Added property to load eBPF RSS with fds.
>   ebpf: Added declaration/initialization routines.
>   qmp: Added new command to retrieve eBPF blob.
>   ebpf: Updated eBPF program and skeleton.
>
>  ebpf/ebpf.c                    |   70 ++
>  ebpf/ebpf.h                    |   31 +
>  ebpf/ebpf_rss-stub.c           |    6 +
>  ebpf/ebpf_rss.c                |  150 +++-
>  ebpf/ebpf_rss.h                |   10 +
>  ebpf/meson.build               |    2 +-
>  ebpf/rss.bpf.skeleton.h        | 1469 ++++++++++++++++----------------
>  hw/net/virtio-net.c            |   55 +-
>  include/hw/virtio/virtio-net.h |    1 +
>  qapi/ebpf.json                 |   55 ++
>  qapi/meson.build               |    1 +
>  qapi/qapi-schema.json          |    1 +
>  tools/ebpf/rss.bpf.c           |    2 +-
>  13 files changed, 1093 insertions(+), 760 deletions(-)
>  create mode 100644 ebpf/ebpf.c
>  create mode 100644 ebpf/ebpf.h
>  create mode 100644 qapi/ebpf.json
>
> --
> 2.39.1
>



^ permalink raw reply	[flat|nested] 21+ messages in thread

* Re: [PATCH v3 0/6] eBPF RSS through QMP support.
  2023-06-30  5:06 ` [PATCH v3 0/6] eBPF RSS through QMP support Jason Wang
@ 2023-06-30  8:04   ` Daniel P. Berrangé
  2023-06-30  8:21     ` Jason Wang
  0 siblings, 1 reply; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-30  8:04 UTC (permalink / raw)
  To: Jason Wang
  Cc: Andrew Melnychenko, mst, armbru, eblake, qemu-devel,
	yuri.benditovich, yan

On Fri, Jun 30, 2023 at 01:06:22PM +0800, Jason Wang wrote:
> On Thu, Jun 15, 2023 at 6:29 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> >
> > This series of patches provides the ability to retrieve eBPF program
> > through qmp, so management application may load bpf blob with proper capabilities.
> > Now, virtio-net devices can accept eBPF programs and maps through properties
> > as external file descriptors. Access to the eBPF map is direct through mmap()
> > call, so it should not require additional capabilities to bpf* calls.
> > eBPF file descriptors can be passed to QEMU from parent process or by unix
> > socket with sendfd() qmp command.
> >
> > Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
> >
> > Changes since v2:
> >  * moved/refactored QMP command
> >  * refactored virtio-net
> 
> I've queued this series, but a question left:
> 
> mmap() support for eBPF maps is not supported from day0, should we
> fallback to syscall for the OS that doesn't support that?

How recent is mmap() support ? Is it difficult to do a fallback ?

As since is a new feature, there's no inherant expectation of support
for arbitrary old platforms. So only worth investing in a fallback if
it is easy, or there's a very compelling reason to support certain
old platforms.


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] 21+ messages in thread

* Re: [PATCH v3 0/6] eBPF RSS through QMP support.
  2023-06-30  8:04   ` Daniel P. Berrangé
@ 2023-06-30  8:21     ` Jason Wang
  2023-06-30  8:55       ` Daniel P. Berrangé
  0 siblings, 1 reply; 21+ messages in thread
From: Jason Wang @ 2023-06-30  8:21 UTC (permalink / raw)
  To: Daniel P. Berrangé
  Cc: Andrew Melnychenko, mst, armbru, eblake, qemu-devel,
	yuri.benditovich, yan

On Fri, Jun 30, 2023 at 4:04 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Fri, Jun 30, 2023 at 01:06:22PM +0800, Jason Wang wrote:
> > On Thu, Jun 15, 2023 at 6:29 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > >
> > > This series of patches provides the ability to retrieve eBPF program
> > > through qmp, so management application may load bpf blob with proper capabilities.
> > > Now, virtio-net devices can accept eBPF programs and maps through properties
> > > as external file descriptors. Access to the eBPF map is direct through mmap()
> > > call, so it should not require additional capabilities to bpf* calls.
> > > eBPF file descriptors can be passed to QEMU from parent process or by unix
> > > socket with sendfd() qmp command.
> > >
> > > Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
> > >
> > > Changes since v2:
> > >  * moved/refactored QMP command
> > >  * refactored virtio-net
> >
> > I've queued this series, but a question left:
> >
> > mmap() support for eBPF maps is not supported from day0, should we
> > fallback to syscall for the OS that doesn't support that?
>
> How recent is mmap() support ?

I don't check.

> Is it difficult to do a fallback ?

Nope, but it requires privilege if we go with a syscall.

>
> As since is a new feature,

But it modifies the old rss loading code, no?

-    for (; i < len; ++i) {
-        if (bpf_map_update_elem(ctx->map_indirections_table, &i,
-                                indirections_table + i, 0) < 0) {
-            return false;
-        }
-    }
+    memcpy(ctx->mmap_indirections_table, indirections_table,
+            sizeof(*indirections_table) * len);

> there's no inherant expectation of support
> for arbitrary old platforms. So only worth investing in a fallback if
> it is easy, or there's a very compelling reason to support certain
> old platforms.

The reason is that we support eBPF RSS with syscall based map updating
in the past if Qemu was running with privilege. With this series, it
won't work if the kernel doesn't support mmap.

Thanks

>
>
> 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] 21+ messages in thread

* Re: [PATCH v3 0/6] eBPF RSS through QMP support.
  2023-06-30  8:21     ` Jason Wang
@ 2023-06-30  8:55       ` Daniel P. Berrangé
  2023-06-30 12:53         ` Andrew Melnichenko
  0 siblings, 1 reply; 21+ messages in thread
From: Daniel P. Berrangé @ 2023-06-30  8:55 UTC (permalink / raw)
  To: Jason Wang
  Cc: Andrew Melnychenko, mst, armbru, eblake, qemu-devel,
	yuri.benditovich, yan

On Fri, Jun 30, 2023 at 04:21:02PM +0800, Jason Wang wrote:
> On Fri, Jun 30, 2023 at 4:04 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> >
> > On Fri, Jun 30, 2023 at 01:06:22PM +0800, Jason Wang wrote:
> > > On Thu, Jun 15, 2023 at 6:29 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > > >
> > > > This series of patches provides the ability to retrieve eBPF program
> > > > through qmp, so management application may load bpf blob with proper capabilities.
> > > > Now, virtio-net devices can accept eBPF programs and maps through properties
> > > > as external file descriptors. Access to the eBPF map is direct through mmap()
> > > > call, so it should not require additional capabilities to bpf* calls.
> > > > eBPF file descriptors can be passed to QEMU from parent process or by unix
> > > > socket with sendfd() qmp command.
> > > >
> > > > Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
> > > >
> > > > Changes since v2:
> > > >  * moved/refactored QMP command
> > > >  * refactored virtio-net
> > >
> > > I've queued this series, but a question left:
> > >
> > > mmap() support for eBPF maps is not supported from day0, should we
> > > fallback to syscall for the OS that doesn't support that?
> >
> > How recent is mmap() support ?
> 
> I don't check.
> 
> > Is it difficult to do a fallback ?
> 
> Nope, but it requires privilege if we go with a syscall.
> 
> >
> > As since is a new feature,
> 
> But it modifies the old rss loading code, no?
> 
> -    for (; i < len; ++i) {
> -        if (bpf_map_update_elem(ctx->map_indirections_table, &i,
> -                                indirections_table + i, 0) < 0) {
> -            return false;
> -        }
> -    }
> +    memcpy(ctx->mmap_indirections_table, indirections_table,
> +            sizeof(*indirections_table) * len);
> 
> > there's no inherant expectation of support
> > for arbitrary old platforms. So only worth investing in a fallback if
> > it is easy, or there's a very compelling reason to support certain
> > old platforms.
> 
> The reason is that we support eBPF RSS with syscall based map updating
> in the past if Qemu was running with privilege. With this series, it
> won't work if the kernel doesn't support mmap.

Oh right, yes, I missed that aspect. So yeah, we do need fallback.


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] 21+ messages in thread

* Re: [PATCH v3 0/6] eBPF RSS through QMP support.
  2023-06-30  8:55       ` Daniel P. Berrangé
@ 2023-06-30 12:53         ` Andrew Melnichenko
  0 siblings, 0 replies; 21+ messages in thread
From: Andrew Melnichenko @ 2023-06-30 12:53 UTC (permalink / raw)
  To: Daniel P. Berrangé
  Cc: Jason Wang, mst, armbru, eblake, qemu-devel, yuri.benditovich,
	yan

Hi all,
Thank you for your comments. I'll check the error/warning.

On Fri, Jun 30, 2023 at 11:55 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Fri, Jun 30, 2023 at 04:21:02PM +0800, Jason Wang wrote:
> > On Fri, Jun 30, 2023 at 4:04 PM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > >
> > > On Fri, Jun 30, 2023 at 01:06:22PM +0800, Jason Wang wrote:
> > > > On Thu, Jun 15, 2023 at 6:29 AM Andrew Melnychenko <andrew@daynix.com> wrote:
> > > > >
> > > > > This series of patches provides the ability to retrieve eBPF program
> > > > > through qmp, so management application may load bpf blob with proper capabilities.
> > > > > Now, virtio-net devices can accept eBPF programs and maps through properties
> > > > > as external file descriptors. Access to the eBPF map is direct through mmap()
> > > > > call, so it should not require additional capabilities to bpf* calls.
> > > > > eBPF file descriptors can be passed to QEMU from parent process or by unix
> > > > > socket with sendfd() qmp command.
> > > > >
> > > > > Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)
> > > > >
> > > > > Changes since v2:
> > > > >  * moved/refactored QMP command
> > > > >  * refactored virtio-net
> > > >
> > > > I've queued this series, but a question left:
> > > >
> > > > mmap() support for eBPF maps is not supported from day0, should we
> > > > fallback to syscall for the OS that doesn't support that?
> > >
> > > How recent is mmap() support ?
> >
> > I don't check.
> >
> > > Is it difficult to do a fallback ?
> >
> > Nope, but it requires privilege if we go with a syscall.
> >
> > >
> > > As since is a new feature,
> >
> > But it modifies the old rss loading code, no?
> >
> > -    for (; i < len; ++i) {
> > -        if (bpf_map_update_elem(ctx->map_indirections_table, &i,
> > -                                indirections_table + i, 0) < 0) {
> > -            return false;
> > -        }
> > -    }
> > +    memcpy(ctx->mmap_indirections_table, indirections_table,
> > +            sizeof(*indirections_table) * len);
> >
> > > there's no inherant expectation of support
> > > for arbitrary old platforms. So only worth investing in a fallback if
> > > it is easy, or there's a very compelling reason to support certain
> > > old platforms.
> >
> > The reason is that we support eBPF RSS with syscall based map updating
> > in the past if Qemu was running with privilege. With this series, it
> > won't work if the kernel doesn't support mmap.
>
> Oh right, yes, I missed that aspect. So yeah, we do need fallback.

Need to check if it is necessary to support the eBPF on an old kernel
that doesn't support mmap for eBPF.
eBPF RSS program itself would require kernel 5.5+.
If I am not mistaken, the mmap for eBPF was added in 5.5
I'll recheck it.

>
>
> 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] 21+ messages in thread

* Re: [PATCH v3 0/6] eBPF RSS through QMP support.
  2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
                   ` (6 preceding siblings ...)
  2023-06-30  5:06 ` [PATCH v3 0/6] eBPF RSS through QMP support Jason Wang
@ 2023-06-30  6:59 ` Jason Wang
  7 siblings, 0 replies; 21+ messages in thread
From: Jason Wang @ 2023-06-30  6:59 UTC (permalink / raw)
  To: Andrew Melnychenko
  Cc: mst, armbru, eblake, qemu-devel, berrange, yuri.benditovich, yan

On Thu, Jun 15, 2023 at 6:29 AM Andrew Melnychenko <andrew@daynix.com> wrote:
>
> This series of patches provides the ability to retrieve eBPF program
> through qmp, so management application may load bpf blob with proper capabilities.
> Now, virtio-net devices can accept eBPF programs and maps through properties
> as external file descriptors. Access to the eBPF map is direct through mmap()
> call, so it should not require additional capabilities to bpf* calls.
> eBPF file descriptors can be passed to QEMU from parent process or by unix
> socket with sendfd() qmp command.
>
> Possible solution for libvirt may look like this: https://github.com/daynix/libvirt/tree/RSS_eBPF (WIP)

I got a build failure:

[18/2192] Compiling C object
libqemuutil.a.p/meson-generated_.._qapi_qapi-commands-ebpf.c.o
FAILED: libqemuutil.a.p/meson-generated_.._qapi_qapi-commands-ebpf.c.o
cc -m64 -mcx16 -Ilibqemuutil.a.p -I. -I.. -Isubprojects/libvhost-user
-I../subprojects/libvhost-user -Iqapi -Itrace -Iui -Iui/shader
-I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include
-I/usr/include/gio-unix-2.0 -I/usr/include/pixman-1
-fdiagnostics-color=auto -Wall -Winvalid-pch -Werror -std=gnu11 -O2 -g
-fstack-protector-strong -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -Wundef
-Wwrite-strings -Wmissing-prototypes -Wstrict-prototypes
-Wredundant-decls -Wold-style-declaration -Wold-style-definition
-Wtype-limits -Wformat-security -Wformat-y2k -Winit-self
-Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels
-Wexpansion-to-defined -Wimplicit-fallthrough=2
-Wmissing-format-attribute -Wno-missing-include-dirs
-Wno-shift-negative-value -Wno-psabi -isystem
/home/devel/git/qemu/linux-headers -isystem linux-headers -iquote .
-iquote /home/devel/git/qemu -iquote /home/devel/git/qemu/include
-iquote /home/devel/git/qemu/host/include/x86_64 -iquote
/home/devel/git/qemu/host/include/generic -iquote
/home/devel/git/qemu/tcg/i386 -pthread -D_GNU_SOURCE
-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing
-fno-common -fwrapv -fPIE -MD -MQ
libqemuutil.a.p/meson-generated_.._qapi_qapi-commands-ebpf.c.o -MF
libqemuutil.a.p/meson-generated_.._qapi_qapi-commands-ebpf.c.o.d -o
libqemuutil.a.p/meson-generated_.._qapi_qapi-commands-ebpf.c.o -c
qapi/qapi-commands-ebpf.c
qapi/qapi-commands-ebpf.c:24:13: error:
‘qmp_marshal_output_EbpfObject’ defined but not used
[-Werror=unused-function]
   24 | static void qmp_marshal_output_EbpfObject(EbpfObject *ret_in,
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Please fix this.

Thanks

>
> Changes since v2:
>  * moved/refactored QMP command
>  * refactored virtio-net
>
> Changes since v1:
>  * refactored virtio-net
>  * moved hunks for ebpf mmap()
>  * added qmp enum for eBPF id.
>
> Andrew Melnychenko (6):
>   ebpf: Added eBPF map update through mmap.
>   ebpf: Added eBPF initialization by fds.
>   virtio-net: Added property to load eBPF RSS with fds.
>   ebpf: Added declaration/initialization routines.
>   qmp: Added new command to retrieve eBPF blob.
>   ebpf: Updated eBPF program and skeleton.
>
>  ebpf/ebpf.c                    |   70 ++
>  ebpf/ebpf.h                    |   31 +
>  ebpf/ebpf_rss-stub.c           |    6 +
>  ebpf/ebpf_rss.c                |  150 +++-
>  ebpf/ebpf_rss.h                |   10 +
>  ebpf/meson.build               |    2 +-
>  ebpf/rss.bpf.skeleton.h        | 1469 ++++++++++++++++----------------
>  hw/net/virtio-net.c            |   55 +-
>  include/hw/virtio/virtio-net.h |    1 +
>  qapi/ebpf.json                 |   55 ++
>  qapi/meson.build               |    1 +
>  qapi/qapi-schema.json          |    1 +
>  tools/ebpf/rss.bpf.c           |    2 +-
>  13 files changed, 1093 insertions(+), 760 deletions(-)
>  create mode 100644 ebpf/ebpf.c
>  create mode 100644 ebpf/ebpf.h
>  create mode 100644 qapi/ebpf.json
>
> --
> 2.39.1
>



^ permalink raw reply	[flat|nested] 21+ messages in thread

end of thread, other threads:[~2023-07-10 12:53 UTC | newest]

Thread overview: 21+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-06-14 22:10 [PATCH v3 0/6] eBPF RSS through QMP support Andrew Melnychenko
2023-06-14 22:10 ` [PATCH v3 1/6] ebpf: Added eBPF map update through mmap Andrew Melnychenko
2023-06-21  7:58   ` Daniel P. Berrangé
2023-06-14 22:10 ` [PATCH v3 2/6] ebpf: Added eBPF initialization by fds Andrew Melnychenko
2023-06-21  7:58   ` Daniel P. Berrangé
2023-06-14 22:10 ` [PATCH v3 3/6] virtio-net: Added property to load eBPF RSS with fds Andrew Melnychenko
2023-06-21  8:01   ` Daniel P. Berrangé
2023-06-14 22:10 ` [PATCH v3 4/6] ebpf: Added declaration/initialization routines Andrew Melnychenko
2023-06-21  8:02   ` Daniel P. Berrangé
2023-06-14 22:10 ` [PATCH v3 5/6] qmp: Added new command to retrieve eBPF blob Andrew Melnychenko
2023-06-21  8:02   ` Daniel P. Berrangé
2023-07-07 11:45   ` Markus Armbruster
2023-07-10 12:52     ` Andrew Melnichenko
2023-06-14 22:10 ` [PATCH v3 6/6] ebpf: Updated eBPF program and skeleton Andrew Melnychenko
2023-06-21  7:58   ` Daniel P. Berrangé
2023-06-30  5:06 ` [PATCH v3 0/6] eBPF RSS through QMP support Jason Wang
2023-06-30  8:04   ` Daniel P. Berrangé
2023-06-30  8:21     ` Jason Wang
2023-06-30  8:55       ` Daniel P. Berrangé
2023-06-30 12:53         ` Andrew Melnichenko
2023-06-30  6:59 ` Jason Wang

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