Re: [PATCH net 1/3] virtio-net: make refill work a per receive queue work

[Bui Quang Minh <minhquangbui99@gmail.com>]

On 12/24/25 07:52, Jason Wang wrote:
> On Tue, Dec 23, 2025 at 11:27 PM Bui Quang Minh
> <minhquangbui99@gmail.com> wrote:
>> Currently, the refill work is a global delayed work for all the receive
>> queues. This commit makes the refill work a per receive queue so that we
>> can manage them separately and avoid further mistakes. It also helps the
>> successfully refilled queue avoid the napi_disable in the global delayed
>> refill work like before.
>>
>> Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
>> ---
> I may miss something but I think this patch is sufficient to fix the problem?
>
> Thanks
>

Yes, this fixes the reproducer in virtnet_rx_resume[_all] but the second 
patch also fixes a bug variant in virtnet_open. After the first patch, 
the enable_delayed_refill is still called before napi_enable. However, 
the only possible delayed refill schedule is in virtnet_set_queues and 
it can't happen between that window because during 
virtnet_rx_resume[_all], we still holds the rtnl_lock. So leaving the 
enable_delayed_refill before napi_enable does not cause an issue but it 
feels not correct to me. But moving enable_delayed_refill after 
napi_enable requires the new pending bool in the third patch.

Thanks,
Quang Minh.