netdev - [PATCH RFC v3 9/9] vhost/net: Support VIRTIO_NET_F_HASH

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Message-Id: <20240915-rss-v3-9-c630015db082@daynix.com>
Date: Sun, 15 Sep 2024 10:17:48 +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>, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH RFC v3 9/9] 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;

-- 
2.46.0