[PULL V2 22/44] hw/net/net_tx_pkt: Automatically determine if virtio-net header is used

[Jason Wang <jasowang@redhat.com>]

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

The new function qemu_get_using_vnet_hdr() allows to automatically
determine if virtio-net header is used.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/e1000e_core.c |  3 +--
 hw/net/net_tx_pkt.c  | 19 ++++++++++---------
 hw/net/net_tx_pkt.h  |  3 +--
 hw/net/vmxnet3.c     |  6 ++----
 4 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
index 38d374f..954a007 100644
--- a/hw/net/e1000e_core.c
+++ b/hw/net/e1000e_core.c
@@ -3376,8 +3376,7 @@ e1000e_core_pci_realize(E1000ECore     *core,
         qemu_add_vm_change_state_handler(e1000e_vm_state_change, core);
 
     for (i = 0; i < E1000E_NUM_QUEUES; i++) {
-        net_tx_pkt_init(&core->tx[i].tx_pkt, core->owner,
-                        E1000E_MAX_TX_FRAGS, core->has_vnet);
+        net_tx_pkt_init(&core->tx[i].tx_pkt, core->owner, E1000E_MAX_TX_FRAGS);
     }
 
     net_rx_pkt_init(&core->rx_pkt, core->has_vnet);
diff --git a/hw/net/net_tx_pkt.c b/hw/net/net_tx_pkt.c
index 8a23899..cf46c84 100644
--- a/hw/net/net_tx_pkt.c
+++ b/hw/net/net_tx_pkt.c
@@ -35,7 +35,6 @@ struct NetTxPkt {
     PCIDevice *pci_dev;
 
     struct virtio_net_hdr virt_hdr;
-    bool has_virt_hdr;
 
     struct iovec *raw;
     uint32_t raw_frags;
@@ -59,7 +58,7 @@ struct NetTxPkt {
 };
 
 void net_tx_pkt_init(struct NetTxPkt **pkt, PCIDevice *pci_dev,
-    uint32_t max_frags, bool has_virt_hdr)
+    uint32_t max_frags)
 {
     struct NetTxPkt *p = g_malloc0(sizeof *p);
 
@@ -71,10 +70,8 @@ void net_tx_pkt_init(struct NetTxPkt **pkt, PCIDevice *pci_dev,
 
     p->max_payload_frags = max_frags;
     p->max_raw_frags = max_frags;
-    p->has_virt_hdr = has_virt_hdr;
     p->vec[NET_TX_PKT_VHDR_FRAG].iov_base = &p->virt_hdr;
-    p->vec[NET_TX_PKT_VHDR_FRAG].iov_len =
-        p->has_virt_hdr ? sizeof p->virt_hdr : 0;
+    p->vec[NET_TX_PKT_VHDR_FRAG].iov_len = sizeof p->virt_hdr;
     p->vec[NET_TX_PKT_L2HDR_FRAG].iov_base = &p->l2_hdr;
     p->vec[NET_TX_PKT_L3HDR_FRAG].iov_base = &p->l3_hdr;
 
@@ -617,9 +614,11 @@ static bool net_tx_pkt_do_sw_fragmentation(struct NetTxPkt *pkt,
 
 bool net_tx_pkt_send(struct NetTxPkt *pkt, NetClientState *nc)
 {
+    bool using_vnet_hdr = qemu_get_using_vnet_hdr(nc->peer);
+
     assert(pkt);
 
-    if (!pkt->has_virt_hdr &&
+    if (!using_vnet_hdr &&
         pkt->virt_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
         net_tx_pkt_do_sw_csum(pkt);
     }
@@ -636,11 +635,13 @@ bool net_tx_pkt_send(struct NetTxPkt *pkt, NetClientState *nc)
         }
     }
 
-    if (pkt->has_virt_hdr ||
+    if (using_vnet_hdr ||
         pkt->virt_hdr.gso_type == VIRTIO_NET_HDR_GSO_NONE) {
+        int index = using_vnet_hdr ?
+                    NET_TX_PKT_VHDR_FRAG : NET_TX_PKT_L2HDR_FRAG;
         net_tx_pkt_fix_ip6_payload_len(pkt);
-        net_tx_pkt_sendv(pkt, nc, pkt->vec,
-            pkt->payload_frags + NET_TX_PKT_PL_START_FRAG);
+        net_tx_pkt_sendv(pkt, nc, pkt->vec + index,
+            pkt->payload_frags + NET_TX_PKT_PL_START_FRAG - index);
         return true;
     }
 
diff --git a/hw/net/net_tx_pkt.h b/hw/net/net_tx_pkt.h
index 2e38a5f..8d3faa4 100644
--- a/hw/net/net_tx_pkt.h
+++ b/hw/net/net_tx_pkt.h
@@ -32,10 +32,9 @@ struct NetTxPkt;
  * @pkt:            packet pointer
  * @pci_dev:        PCI device processing this packet
  * @max_frags:      max tx ip fragments
- * @has_virt_hdr:   device uses virtio header.
  */
 void net_tx_pkt_init(struct NetTxPkt **pkt, PCIDevice *pci_dev,
-    uint32_t max_frags, bool has_virt_hdr);
+    uint32_t max_frags);
 
 /**
  * Clean all tx packet resources.
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index d7d492a..eab8fa4 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -1521,8 +1521,7 @@ static void vmxnet3_activate_device(VMXNET3State *s)
 
     /* Preallocate TX packet wrapper */
     VMW_CFPRN("Max TX fragments is %u", s->max_tx_frags);
-    net_tx_pkt_init(&s->tx_pkt, PCI_DEVICE(s),
-                    s->max_tx_frags, s->peer_has_vhdr);
+    net_tx_pkt_init(&s->tx_pkt, PCI_DEVICE(s), s->max_tx_frags);
     net_rx_pkt_init(&s->rx_pkt, s->peer_has_vhdr);
 
     /* Read rings memory locations for RX queues */
@@ -2402,8 +2401,7 @@ static int vmxnet3_post_load(void *opaque, int version_id)
 {
     VMXNET3State *s = opaque;
 
-    net_tx_pkt_init(&s->tx_pkt, PCI_DEVICE(s),
-                    s->max_tx_frags, s->peer_has_vhdr);
+    net_tx_pkt_init(&s->tx_pkt, PCI_DEVICE(s), s->max_tx_frags);
     net_rx_pkt_init(&s->rx_pkt, s->peer_has_vhdr);
 
     if (s->msix_used) {
-- 
2.7.4