netdev - Re: Regression: [PATCH] mlx4: give precise rx/tx bytes/packets counters

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Date:   Sun, 4 Dec 2016 15:21:15 +0200
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: Regression: [PATCH] mlx4: give precise rx/tx bytes/packets counters

On Thu, Dec 1, 2016 at 7:08 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Thu, 2016-12-01 at 18:33 +0200, Saeed Mahameed wrote:
>
>> Thanks for the detailed answer !!
>
> You're welcome.
>
>>
>> BTW you went 5 steps ahead of my original question :)), so far you
>> already have a patch without locking at all (really impressive).
>>
>> What i wanted to ask originally, was regarding the "_bh", i didn't
>> mean to completely remove the "spin_lock_bh",
>> I meant, what happens if we replace "spin_lock_bh"  with "spin_lock",
>> without disabling bh ?
>> I gues raw "sping_lock" handles points (2 to 4) from above, but it
>> won't handle long irqs.
>
> Thats a very good point, the _bh prefix can totally be removed, since
> stats_lock is only acquired from process context.
>
>

That was my initial point, Thanks for the help.
will provide a fix patch later once 4.9 is release.