linux-kernel - [PATCH v2] virtio-net: Zero max_tx_vq field for VIRTIO_NET_CTRL_MQ_HASH

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Message-Id: <20230810110405.25558-1-yin31149@gmail.com>
Date:   Thu, 10 Aug 2023 19:04:05 +0800
From:   Hawkins Jiawei <yin31149@...il.com>
To:     yin31149@...il.com
Cc:     eperezma@...hat.com, 18801353760@....com,
        Andrew Melnychenko <andrew@...nix.com>, stable@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] virtio-net: Zero max_tx_vq field for VIRTIO_NET_CTRL_MQ_HASH_CONFIG case

Kernel uses `struct virtio_net_ctrl_rss` to save command-specific-data
for both the VIRTIO_NET_CTRL_MQ_HASH_CONFIG and
VIRTIO_NET_CTRL_MQ_RSS_CONFIG commands.

According to the VirtIO standard, "Field reserved MUST contain zeroes.
It is defined to make the structure to match the layout of
virtio_net_rss_config structure, defined in 5.1.6.5.7.".

Yet for the VIRTIO_NET_CTRL_MQ_HASH_CONFIG command case, the `max_tx_vq`
field in struct virtio_net_ctrl_rss, which corresponds to the
`reserved` field in struct virtio_net_hash_config, is not zeroed,
thereby violating the VirtIO standard.

This patch solves this problem by zeroing this field in
virtnet_init_default_rss().

Cc: Andrew Melnychenko <andrew@...nix.com>
Cc: stable@...r.kernel.org
Fixes: c7114b1249fa ("drivers/net/virtio_net: Added basic RSS support.")
Signed-off-by: Hawkins Jiawei <yin31149@...il.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Acked-by: Eugenio Pérez <eperezma@...hat.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/net/virtio_net.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 1270c8d23463..8db38634ae82 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2761,7 +2761,7 @@ static void virtnet_init_default_rss(struct virtnet_info *vi)
 		vi->ctrl->rss.indirection_table[i] = indir_val;
 	}

-	vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs;
+	vi->ctrl->rss.max_tx_vq = vi->has_rss ? vi->curr_queue_pairs : 0;
 	vi->ctrl->rss.hash_key_length = vi->rss_key_size;

 	netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size);
-- 
2.34.1