On Mon, 2023-11-06 at 16:18 +0800, Xuan Zhuo wrote:
> For rq, we have three cases getting buffers from virtio core:
>
> 1. virtqueue_get_buf{,_ctx}
> 2. virtqueue_detach_unused_buf
> 3. callback for virtqueue_resize
>
> But in commit 295525e29a5b("virtio_net: merge dma operations when
> filling mergeable buffers"), I missed the dma unmap for the #3 case.
>
> That will leak some memory, because I did not release the pages referred
> by the unused buffers.
>
> If we do such script, we will make the system OOM.
>
> while true
> do
> ethtool -G ens4 rx 128
> ethtool -G ens4 rx 256
> free -m
> done
>
> Fixes: 295525e29a5b ("virtio_net: merge dma operations when filling mergeable buffers")
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
@Micheal, @Jason: this fix LGTM, but I guess it deserve an explicit ack
from you before merging, thanks!
Paolo
