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| author | Akihiko Odaki <akihiko.odaki@daynix.com> | 2024-04-28 16:00:52 +0900 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2024-06-04 15:14:26 +0800 |
| commit | ad57f700f469ba1b621274053973f76f8f97cf83 (patch) | |
| tree | ac9a0ce92aa05a0b077dd13feb4584cb6c903b94 /hw/net | |
| parent | 8c49756825dab430b17648637735c2736d23f778 (diff) | |
| download | qemu-ad57f700f469ba1b621274053973f76f8f97cf83.zip qemu-ad57f700f469ba1b621274053973f76f8f97cf83.tar.gz qemu-ad57f700f469ba1b621274053973f76f8f97cf83.tar.bz2 | |
virtio-net: Copy header only when necessary
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>
Diffstat (limited to 'hw/net')
| -rw-r--r-- | hw/net/virtio-net.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index a8db8bf..13a17a1 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 |