linux-kernel - Re: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head room in the skb

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Message-ID: <20151124085532.GA1740@breakpoint.cc>
Date:	Tue, 24 Nov 2015 09:55:32 +0100
From:	Florian Westphal <fw@...len.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, jasowang@...hat.com
Subject: Re: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head
 room in the skb

K. Y. Srinivasan <kys@...rosoft.com> wrote:
> The rndis header is 116 bytes big and can be placed in the default
> head room that will be available in the skb. Since the netvsc packet
> is less than 48 bytes, we can use the skb control buffer
> for the netvsc packet. With these changes we don't need to
> ask for additional head room.

Minor nit: could you add a BUILD_BUG_ON test for this?  Something like

BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) > FIELD_SIZEOF(struct sk_buff, cb));
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