On Tue, Dec 3, 2024 at 10:14 AM Jakub Kicinski kuba@kernel.org wrote:
On Mon, 2 Dec 2024 12:22:53 +0800 Jason Wang wrote:
Fixes: c8bd1f7f3e61 ("virtio_net: add support for Byte Queue Limits") Cc: stable@vger.kernel.org # v6.11+ Signed-off-by: Koichiro Den koichiro.den@canonical.com
Acked-by: Jason Wang jasowang@redhat.com
I see Tx skb flush in:
virtnet_freeze() -> remove_vq_common() -> free_unused_bufs() -> virtnet_sq_free_unused_buf()
do we need to reset the BQL state in that case?
Yes, I think so. And I spot another path which is:
virtnet_tx_resize() -> virtqueue_resize() -> virtnet_sq_free_unused_buf().
Rule of thumb is netdev_tx_reset_queue() should follow any flush (IOW skb freeing not followed by netdev_tx_completed_queue()).
Right.
Koichiro, I think this fixes the problem of open/stop but may break freeze/restore(). Let's fix that.
For resizing, it's a path that has been buggy since the introduction of BQL.
Thanks