linux-kernel - Re: hardware time stamping with optional structs in data area

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Message-ID: <20090128090821.GA15770@gondor.apana.org.au>
Date:	Wed, 28 Jan 2009 20:08:21 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Patrick Ohly <patrick.ohly@...el.com>
Cc:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: hardware time stamping with optional structs in data area

Patrick Ohly <patrick.ohly@...el.com> wrote:
>
> True - at this time. But what if this extension mechanism turns out to
> be useful and we end up with more optional structures? I was hoping that
> this might be the case and thus tried to make it easy to add more
> structures.

You're putting the extension in the skb->end area, right?

How big are the time stamps? If they're not that big, why don't
we put it into the shinfo structure itself? For the common case,
we have plenty of space due to kmalloc padding anyway.

Cheers,
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