netdev - [PATCH v1 net-next 3/3] vhost/net: enable outer nw header offset support.

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Message-ID: <20250923202258.2738717-4-kshankar@marvell.com>
Date: Wed, 24 Sep 2025 01:52:58 +0530
From: Kommula Shiva Shankar <kshankar@...vell.com>
To: <netdev@...r.kernel.org>, <mst@...hat.com>, <jasowang@...hat.com>,
        <pabeni@...hat.com>, <xuanzhuo@...ux.alibaba.com>
CC: <virtualization@...ts.linux.dev>, <parav@...dia.com>, <jerinj@...vell.com>,
        <ndabilpuram@...vell.com>, <sburla@...vell.com>, <schalla@...vell.com>
Subject: [PATCH v1 net-next  3/3] vhost/net: enable outer nw header offset support.

apprise vhost net about the virtio net header size.

Signed-off-by: Kommula Shiva Shankar <kshankar@...vell.com>
---
 drivers/vhost/net.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index c6508fe0d5c8..a5c56af555f9 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -78,6 +78,7 @@ static const u64 vhost_net_features[VIRTIO_FEATURES_DWORDS] = {
 	(1ULL << VIRTIO_F_IN_ORDER),
 	VIRTIO_BIT(VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO) |
 	VIRTIO_BIT(VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO),
+	VIRTIO_BIT(VIRTIO_NET_F_OUT_NET_HEADER),
 };
 
 enum {
@@ -1661,6 +1662,9 @@ static int vhost_net_set_features(struct vhost_net *n, const u64 *features)
 		  sizeof(struct virtio_net_hdr_mrg_rxbuf) :
 		  sizeof(struct virtio_net_hdr);
 
+	if (virtio_features_test_bit(features,
+				     VIRTIO_NET_F_OUT_NET_HEADER))
+		hdr_len = sizeof(struct virtio_net_hdr_v1_hash_tunnel_out_net_hdr);
 	if (virtio_features_test_bit(features,
 				     VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO) ||
 	    virtio_features_test_bit(features,
-- 
2.48.1