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: NSteinar H. Gunderson <sesse@google.com> Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Paul Stewart <pstew@google.com> Acked-by: NStanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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