[PATCH v2] virtio-net: Zero max_tx_vq field for VIRTIO_NET_CTRL_MQ_HASH_CONFIG case

[PATCH v2] virtio-net: Zero max_tx_vq field for VIRTIO_NET_CTRL_MQ_HASH_CONFIG case

[Hawkins Jiawei]

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>
---
 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

Re: [PATCH v2] virtio-net: Zero max_tx_vq field for VIRTIO_NET_CTRL_MQ_HASH_CONFIG case

[Xuan Zhuo]

On Thu, 10 Aug 2023 19:04:05 +0800, Hawkins Jiawei <yin31149@gmail.com> 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>

Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.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
>

Re: [PATCH v2] virtio-net: Zero max_tx_vq field for VIRTIO_NET_CTRL_MQ_HASH_CONFIG case

[Hawkins Jiawei]

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);