netdev - Re: [PATCH net-next v7] vhost_net: avoid tx queue stuck when sendmsg fails

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Message-ID: <20210119045607-mutt-send-email-mst@kernel.org>
Date:   Tue, 19 Jan 2021 04:56:59 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     wangyunjian <wangyunjian@...wei.com>, netdev@...r.kernel.org,
        jasowang@...hat.com, willemdebruijn.kernel@...il.com,
        virtualization@...ts.linux-foundation.org,
        jerry.lilijun@...wei.com, chenchanghu@...wei.com,
        xudingke@...wei.com, brian.huangbin@...wei.com
Subject: Re: [PATCH net-next v7] vhost_net: avoid tx queue stuck when sendmsg
 fails

On Mon, Jan 18, 2021 at 02:33:29PM -0800, Jakub Kicinski wrote:
> On Fri, 15 Jan 2021 12:46:20 +0800 wangyunjian wrote:
> > From: Yunjian Wang <wangyunjian@...wei.com>
> > 
> > Currently the driver doesn't drop a packet which can't be sent by tun
> > (e.g bad packet). In this case, the driver will always process the
> > same packet lead to the tx queue stuck.
> > 
> > To fix this issue:
> > 1. in the case of persistent failure (e.g bad packet), the driver
> >    can skip this descriptor by ignoring the error.
> > 2. in the case of transient failure (e.g -ENOBUFS, -EAGAIN and -ENOMEM),
> >    the driver schedules the worker to try again.
> > 
> > Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
> 
> Michael, LMK if you want to have a closer look otherwise I'll apply
> tomorrow.

Thanks for the reminder. Acked.

-- 
MST