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Date:   Sun, 17 May 2020 12:35:52 -0700
From:   Florian Fainelli <>
To:     Cong Wang <>,
        Vladimir Oltean <>
Cc:     Taehee Yoo <>, Netdev <>,
        syzbot <>,
        Dmitry Vyukov <>,
        Andrew Lunn <>,
        Vivien Didelot <>
Subject: Re: [Patch net-next v2 1/2] net: partially revert dynamic lockdep key

On 5/17/2020 11:42 AM, Cong Wang wrote:
> On Sat, May 16, 2020 at 9:53 AM Vladimir Oltean <> wrote:
>> Thanks a lot for presenting the options. In general, xmit in DSA is
>> relatively simple and most of the time stateless. My stacked DSA setup
>> appears to work just fine with NETIF_F_LLTX, including the updating of
>> percpu counters. I'm not really sure if there's something in
>> particular to test?
>> Anyway, will you send a patch with NETIF_F_LLTX or should I do it? I
>> can do further testing if necessary.
> If DSA is software based, there is a large chance it can be just
> using NETIF_F_LLTX, like you said.
> Please do send a patch for this NETIF_F_LLTX. Note my patch
> simply reverts to the old code, this issue probably exists before it.

It transmits frames by calling dev_queue_xmit() after having assigned 
skb->dev to be pointing to the master network device, very much like 
what VLAN devices do for instance, so I believe setting NETIF_F_LLTX is 
fine here.

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