[PATCH RFC v4 9/9] vhost/net: Support VIRTIO_NET_F_HASH_REPORT

Akihiko Odaki
2024-09-24T09:01:36Z

VIRTIO_NET_F_HASH_REPORT allows to report hash values calculated on the
host. When VHOST_NET_F_VIRTIO_NET_HDR is employed, it will report no
hash values (i.e., the hash_report member is always set to
VIRTIO_NET_HASH_REPORT_NONE). Otherwise, the values reported by the
underlying socket will be reported.

VIRTIO_NET_F_HASH_REPORT requires VIRTIO_F_VERSION_1.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
drivers/vhost/net.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index f16279351db5..ec1167a782ec 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -73,6 +73,7 @@ enum {
VHOST_NET_FEATURES = VHOST_FEATURES |
(1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
(1ULL << VIRTIO_NET_F_MRG_RXBUF) |
+ (1ULL << VIRTIO_NET_F_HASH_REPORT) |
(1ULL << VIRTIO_F_ACCESS_PLATFORM) |
(1ULL << VIRTIO_F_RING_RESET)
};
@@ -1604,10 +1605,13 @@ static int vhost_net_set_features(struct vhost_net *n, u64 features)
size_t vhost_hlen, sock_hlen, hdr_len;
int i;

- hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
- (1ULL << VIRTIO_F_VERSION_1))) ?
- sizeof(struct virtio_net_hdr_mrg_rxbuf) :
- sizeof(struct virtio_net_hdr);
+ if (features & (1ULL << VIRTIO_NET_F_HASH_REPORT))
+ hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
+ else if (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) |
+ (1ULL << VIRTIO_F_VERSION_1)))
+ hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ else
+ hdr_len = sizeof(struct virtio_net_hdr);
if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) {
/* vhost provides vnet_hdr */
vhost_hlen = hdr_len;
@@ -1688,6 +1692,10 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
return -EFAULT;
if (features & ~VHOST_NET_FEATURES)
return -EOPNOTSUPP;
+ if ((features & ((1ULL << VIRTIO_F_VERSION_1) |
+ (1ULL << VIRTIO_NET_F_HASH_REPORT))) ==
+ (1ULL << VIRTIO_NET_F_HASH_REPORT))
+ return -EINVAL;
return vhost_net_set_features(n, features);
case VHOST_GET_BACKEND_FEATURES:
features = VHOST_NET_BACKEND_FEATURES;

--
2.46.0