On 2023/8/10 19:04, Hawkins Jiawei wrote:

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

---

Sorry for missing the ChangeLog here.

v2: - Add the missing tags, no code changes.

v1: https://lore.kernel.org/all/20230810031557.135557-1-yin31149@gmail.com/

Thanks!

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);