From: Hawkins Jiawei <yin31149@xxxxxxxxx>
commit 2c507ce90e02cd78d00fd4b0fe26c8641873c13f upstream.
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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: c7114b1249fa ("drivers/net/virtio_net: Added basic RSS support.")
Signed-off-by: Hawkins Jiawei <yin31149@xxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Acked-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Message-Id: <20230810110405.25558-1-yin31149@xxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Reviewed-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/virtio_net.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2504,7 +2504,7 @@ static void virtnet_init_default_rss(str
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);
