From: Hawkins Jiawei yin31149@gmail.com
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@daynix.com Cc: stable@vger.kernel.org Fixes: c7114b1249fa ("drivers/net/virtio_net: Added basic RSS support.") Signed-off-by: Hawkins Jiawei yin31149@gmail.com Acked-by: Jason Wang jasowang@redhat.com Acked-by: Eugenio Pérez eperezma@redhat.com Acked-by: Michael S. Tsirkin mst@redhat.com Message-Id: 20230810110405.25558-1-yin31149@gmail.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Reviewed-by: Xuan Zhuo xuanzhuo@linux.alibaba.com Acked-by: Jason Wang jasowang@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 @@ -2652,7 +2652,7 @@ 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);