From: David S. Miller <davem@davemloft.net>
Date: Mon, 9 Feb 2009 03:24:13 +0000 (-0800)
Subject: net: Increase default NET_SKB_PAD to 32.
X-Git-Tag: v2.6.30-rc1~662^2~765
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6301d3dd1c287b32132dda15272a50c11e92a14;p=pandora-kernel.git

net: Increase default NET_SKB_PAD to 32.

Several devices need to insert some "pre headers" in front of the
main packet data when they transmit a packet.

Currently we allocate only 16 bytes of pad room and this ends up not
being enough for some types of hardware (NIU, usb-net, s390 qeth,
etc.)

So increase this to 32.

Note that drivers still need to check in their transmit routine
whether enough headroom exists, and if not use skb_realloc_headroom().
Tunneling, IPSEC, and other encapsulation methods can cause the
padding area to be used up.

Signed-off-by: David S. Miller <davem@davemloft.net>
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