netdev - Re: [PATCH net v7 0/3] fix packet stuck problem for lockless qdisc

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Date:   Thu, 13 May 2021 08:24:04 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     <davem@...emloft.net>, <olteanv@...il.com>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andriin@...com>, <edumazet@...gle.com>,
        <weiwan@...gle.com>, <cong.wang@...edance.com>,
        <ap420073@...il.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>,
        <mkl@...gutronix.de>, <linux-can@...r.kernel.org>,
        <jhs@...atatu.com>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <andrii@...nel.org>, <kafai@...com>, <songliubraving@...com>,
        <yhs@...com>, <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <bpf@...r.kernel.org>, <jonas.bonn@...rounds.com>,
        <pabeni@...hat.com>, <mzhivich@...mai.com>, <johunt@...mai.com>,
        <albcamus@...il.com>, <kehuan.feng@...il.com>,
        <a.fatoum@...gutronix.de>, <atenart@...nel.org>,
        <alexander.duyck@...il.com>, <hdanton@...a.com>, <jgross@...e.com>,
        <JKosina@...e.com>, <mkubecek@...e.cz>, <bjorn@...nel.org>,
        <alobakin@...me>
Subject: Re: [PATCH net v7 0/3] fix packet stuck problem for lockless qdisc

On Thu, 13 May 2021 09:10:57 +0800 Yunsheng Lin wrote:
> This patchset fixes the packet stuck problem mentioned in [1].
> 
> Patch 1: Add STATE_MISSED flag to fix packet stuck problem.
> Patch 2: Fix a tx_action rescheduling problem after STATE_MISSED
>          flag is added in patch 1.
> Patch 3: Fix the significantly higher CPU consumption problem when
>          multiple threads are competing on a saturated outgoing
>          device.
> 
> V7: Fix netif_tx_wake_queue() data race noted by Jakub.
> V6: Some performance optimization in patch 1 suggested by Jakub
>     and drop NET_XMIT_DROP checking in patch 3.
> V5: add patch 3 to fix the problem reported by Michal Kubecek.
> V4: Change STATE_NEED_RESCHEDULE to STATE_MISSED and add patch 2.

Another review from someone who knows this code better would be great,
but it seems good to me (w/ minor nit on patch 3 addressed):

Acked-by: Jakub Kicinski <kuba@...nel.org>