netdev - Re: [PATCH net-next] bpf: netdev is never null in __dev_map

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Date:   Wed, 23 Aug 2017 20:10:15 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net
CC:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] bpf: netdev is never null in __dev_map_flush

On 08/23/2017 06:25 PM, Alexei Starovoitov wrote:
> On 8/23/17 6:20 PM, Daniel Borkmann wrote:
>> No need to test for it in fast-path, every dev in bpf_dtab_netdev
>> is guaranteed to be non-NULL, otherwise dev_map_update_elem() will
>> fail in the first place.
>>
>> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> 
> wow. interesting. I'm surprised you see a difference from
> such micro-optimization.
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> 
> 

Thanks for the clean up, I was a bit over paranoid here as well. Is
this actually noticeable in pps benchmark or just making the code
cleaner? Just curious.

Acked-by: John Fastabend <john.fastabend@...il.com>