iwl3945: better skb management in rx path

Steinar reported reallocations of skb->head with IPv6, leading to
a warning in skb_try_coalesce()

It turns out iwl3945 has several problems :

1) skb->truesize is underestimated.
   We really consume PAGE_SIZE bytes for a fragment,
   not the frame length.
2) 128 bytes of initial headroom is a bit low and forces reallocations.
3) We can avoid consuming a full page for small enough frames.

Reported-by: Steinar H. Gunderson <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Paul Stewart <[email protected]>
Acked-by: Stanislaw Gruszka <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

0 files changed, 0 insertions, 0 deletions