linux-kernel - Re: [PATCH net-next 1/2] bpf: allow extended BPF programs access skb fields

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Date:	Fri, 13 Mar 2015 10:09:21 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>,
	"David S. Miller" <davem@...emloft.net>
CC:	Thomas Graf <tgraf@...g.ch>, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] bpf: allow extended BPF programs access
 skb fields

On 3/13/15 9:43 AM, Daniel Borkmann wrote:
> On 03/13/2015 05:22 PM, Alexei Starovoitov wrote:
>> On 3/13/15 2:57 AM, Daniel Borkmann wrote:
>>> On 03/13/2015 03:21 AM, Alexei Starovoitov wrote:
>>>> introduce user accessible mirror of in-kernel 'struct sk_buff':
>>>
>>> For each member, I'd also add BUILD_BUG_ON()s similarly as we have in
>>> convert_bpf_extensions(). That way, people won't forget to adjust the
>>> code.
>>
>> I thought about it, but didn't add it, since we already have them
>> in the same file several lines above this spot.
>> I think one build error per .c file should be enough to attract
>> attention.
>> Though I'll add a comment to convert_bpf_extensions() that build_bug_on
>> errors should be addressed in two places.
>
> My concern would be that in case the code gets changed, this spot
> could easily be overlooked by someone possibly unfamiliar with the
> code, since no build error triggers there.
>
> So I guess it wouldn't hurt or cost us much to also adding the
> BUILD_BUG_ON()s there instead of a comment.

I think it's overkill, but fine, it's minor. Will add another set
of build_bug_ons and see how it looks.

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