net: Increase default NET_SKB_PAD to 32.

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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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This commit is contained in:

David S. Miller 2009-02-08 19:24:13 -08:00

parent 409f0a9014

commit d6301d3dd1

1 changed files with 3 additions and 3 deletions

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6

include/linux/skbuff.h

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