netdev - Re: [PATCH v6] vhost_net: avoid tx queue stuck when sendmsg fails

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Message-ID: <20210107165659.512fe71c@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 7 Jan 2021 16:56:59 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     wangyunjian <wangyunjian@...wei.com>
Cc:     <netdev@...r.kernel.org>, <mst@...hat.com>,
        <willemdebruijn.kernel@...il.com>, <jasowang@...hat.com>,
        <virtualization@...ts.linux-foundation.org>,
        <jerry.lilijun@...wei.com>, <xudingke@...wei.com>,
        <chenchanghu@...wei.com>, <brian.huangbin@...wei.com>
Subject: Re: [PATCH v6] vhost_net: avoid tx queue stuck when sendmsg fails

On Thu, 7 Jan 2021 17:49:45 +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>

Hi! AFAIU this needs to go to net-next. You need to wait until net is
merged into net-next and then repost. It doesn't apply at the moment
and we get in excess of 100 patches a day right now so keeping track 
of dependencies on the maintainer side does not work. Also build bot
can't test it.

net should get merged into net-next some time tomorrow or on Saturday.