netdev - Re: [PATCH net 0/2] add checking sq is full inside xdp xmit

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Date:   Tue, 7 Mar 2023 10:59:47 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, netdev@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: Re: [PATCH net 0/2] add checking sq is full inside xdp xmit

On Tue, Mar 07, 2023 at 10:53:41AM +0100, Paolo Abeni wrote:
> Hi,
> On Tue, 2023-03-07 at 09:49 +0800, Xuan Zhuo wrote:
> > On Mon, 6 Mar 2023 12:58:22 -0500, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> > > On Mon, Mar 06, 2023 at 12:15:33PM +0800, Xuan Zhuo wrote:
> > > > If the queue of xdp xmit is not an independent queue, then when the xdp
> > > > xmit used all the desc, the xmit from the __dev_queue_xmit() may encounter
> > > > the following error.
> > > > 
> > > > net ens4: Unexpected TXQ (0) queue failure: -28
> > > > 
> > > > This patch adds a check whether sq is full in XDP Xmit.
> > > > 
> > > > Thanks.
> > > 
> > > Acked-by: Michael S. Tsirkin <mst@...hat.com>
> > > 
> > > needed for stable?
> > 
> > Yes i think.
> 
> Could you please re-post including a suitable 'Fixes' tag? That would
> address stable, too. Additionally you could rename check_sq_full() in
> patch 1, perhaps 'check_disable_sq_full()' would do.

Not that's even more confusing it sounds like it's checking that
it's checking that sq is disabled unless one looks closely.

I think check_sq_full_and_disable() is better.

> You can retain the already collected tags.
> 
> Thanks!
> 
> Paolo