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From: Akihiko Odaki <akihiko.odaki@daynix.com>
Date: Thu, 13 Mar 2025 15:55:35 +0900
Subject: [PATCH RFC v4 09/11] virtio-net: Offload hashing without vhost
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To: qemu-devel@nongnu.org, Yuri Benditovich <yuri.benditovich@daynix.com>,
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This is necessary to offload hashing to tap.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
hw/net/virtio-net.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index e125478ae834..edfc76a5308e 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1712,7 +1712,11 @@ static size_t receive_header(VirtIONet *n, struct vi=
rtio_net_hdr *hdr,
{
size_t hdr_len =3D n->guest_hdr_len;
=20
- memcpy(hdr, buf, sizeof(struct virtio_net_hdr));
+ memcpy(hdr, buf,
+ n->rss_data.populate_hash &&
+ n->rss_data.enabled && !n->rss_data.enabled_software_rss ?
+ sizeof(struct virtio_net_hdr_v1_hash) :
+ sizeof(struct virtio_net_hdr));
=20
*buf_offset =3D n->host_hdr_len;
work_around_broken_dhclient(hdr, &hdr_len, buf, buf_size, buf_offset);
@@ -3111,11 +3115,13 @@ static uint64_t virtio_net_get_features(VirtIODevic=
e *vdev, uint64_t features,
}
=20
if (!get_vhost_net(nc->peer)) {
- if (!use_own_hash) {
- virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
- virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
- } else if (virtio_has_feature(features, VIRTIO_NET_F_RSS)) {
- virtio_net_load_ebpf(n, errp);
+ if (!use_peer_hash) {
+ if (!use_own_hash) {
+ virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
+ virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
+ } else if (virtio_has_feature(features, VIRTIO_NET_F_RSS)) {
+ virtio_net_load_ebpf(n, errp);
+ }
}
=20
return features;
--=20
2.48.1