netdev - Re: [PATCH net-next v3] net: dqs: introduce IFF_NO

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Message-ID: <ZmqFzpQOaQfp7Wjr@nanopsycho.orion>
Date: Thu, 13 Jun 2024 07:38:22 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jason Xing <kerneljasonxing@...il.com>
Cc: edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	davem@...emloft.net, dsahern@...nel.org, mst@...hat.com,
	jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com, leitao@...ian.org, netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v3] net: dqs: introduce IFF_NO_BQL private flag
 for non-BQL drivers

Thu, Jun 13, 2024 at 04:35:49AM CEST, kerneljasonxing@...il.com wrote:
>From: Jason Xing <kernelxing@...cent.com>
>
>Since commit 74293ea1c4db6 ("net: sysfs: Do not create sysfs for non
>BQL device") limits the non-BQL driver not creating byte_queue_limits
>directory, I found there is one exception, namely, virtio-net driver,
>which should also be limited in netdev_uses_bql(). Let me give it a
>try first.
>
>I decided to introduce a NO_BQL bit because:
>1) it can help us limit virtio-net driver for now.
>2) if we found another non-BQL driver, we can take it into account.
>3) we can replace all the driver meeting those two statements in
>netdev_uses_bql() in future.
>
>For now, I would like to make the first step to use this new bit for dqs
>use instead of replacing/applying all the non-BQL drivers in one go.
>
>As Jakub said, "netdev_uses_bql() is best effort", I think, we can add
>new non-BQL drivers as soon as we find one.
>
>After this patch, there is no byte_queue_limits directory in virtio-net
>driver.

Please note following patch is currently trying to push bql support for
virtio_net:
https://lore.kernel.org/netdev/20240612170851.1004604-1-jiri@resnulli.us/

When that is merged, this patch is not needed. Could we wait?