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Message-Id: <20241008-rss-v5-10-f3cf68df005d@daynix.com>
Date: Tue, 08 Oct 2024 15:54:30 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: Jonathan Corbet <corbet@....net>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Jason Wang <jasowang@...hat.com>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Shuah Khan <shuah@...nel.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org,
Yuri Benditovich <yuri.benditovich@...nix.com>,
Andrew Melnychenko <andrew@...nix.com>,
Stephen Hemminger <stephen@...workplumber.org>, gur.stavi@...wei.com,
Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH RFC v5 10/10] vhost/net: Support VIRTIO_NET_F_HASH_REPORT
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@...nix.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;
--
2.46.2
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