netdev - Re: [Patch net v2 1/2] lwt: disable BH too in run_lwt

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Date:   Mon, 07 Dec 2020 20:10:06 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        wangdongdong.6@...edance.com, tgraf@...g.ch,
        alexei.starovoitov@...il.com, cong.wang@...edance.com
Subject: Re: [Patch net v2 1/2] lwt: disable BH too in run_lwt_bpf()

Hello:

This series was applied to bpf/bpf.git (refs/heads/master):

On Fri,  4 Dec 2020 23:59:45 -0800 you wrote:
> From: Dongdong Wang <wangdongdong.6@...edance.com>
> 
> The per-cpu bpf_redirect_info is shared among all skb_do_redirect()
> and BPF redirect helpers. Callers on RX path are all in BH context,
> disabling preemption is not sufficient to prevent BH interruption.
> 
> In production, we observed strange packet drops because of the race
> condition between LWT xmit and TC ingress, and we verified this issue
> is fixed after we disable BH.
> 
> [...]

Here is the summary with links:
  - [net,v2,1/2] lwt: disable BH too in run_lwt_bpf()
    https://git.kernel.org/bpf/bpf/c/d9054a1ff585
  - [net,v2,2/2] lwt_bpf: replace preempt_disable() with migrate_disable()
    https://git.kernel.org/bpf/bpf/c/e3366884b383

You are awesome, thank you!
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