netdev - Re: [PATCH] packet: Deliver VLAN TPID to userspace

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Message-ID: <20131022154110.518282ba@nehalam.linuxnetplumber.net>
Date:	Tue, 22 Oct 2013 15:41:10 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Atzm Watanabe <atzm@...atosphere.co.jp>
Cc:	Ben Hutchings <bhutchings@...arflare.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH] packet: Deliver VLAN TPID to userspace

On Tue, 22 Oct 2013 11:56:31 +0900
Atzm Watanabe <atzm@...atosphere.co.jp> wrote:

> Hmm...  I think TPACKET{,2,3}_HDRLEN should not be removed without
> careful considerations.  Because some userspace programs (e.g libpcap)
> are using them in order to check mmap ability of the kernel...


That's bad because it means the library then depends on the headers
of the machine it was built on, not the machine it is running on. I often
build software on boxes where /usr/include version of kernel headers is out dated.
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