On Thu, Feb 02, 2023 at 07:00:49PM +0800, Xuan Zhuo wrote:
> Since xsk's TX queue is consumed by TX NAPI, if sq is bound to xsk, then
> we must stop tx napi from being disabled.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> ---
> drivers/net/virtio/main.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index ed79e750bc6c..232cf151abff 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -2728,8 +2728,15 @@ static int virtnet_set_coalesce(struct net_device *dev,
> return ret;
>
> if (update_napi) {
> - for (i = 0; i < vi->max_queue_pairs; i++)
> + for (i = 0; i < vi->max_queue_pairs; i++) {
> + /* xsk xmit depend on the tx napi. So if xsk is active,
depends.
> + * prevent modifications to tx napi.
> + */
> + if (rtnl_dereference(vi->sq[i].xsk.pool))
> + continue;
> +
> vi->sq[i].napi.weight = napi_weight;
I don't get it.
changing napi weight does not work then.
why is this ok?
> + }
> }
>
> return ret;
> --
> 2.32.0.3.g01195cf9f
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