iwl3945: better skb management in rx path

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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 <sesse@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Paul Stewart <pstew@google.com>
Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

...

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Eric Dumazet 2013-06-28 08:05:06 -07:00 • committed by John W. Linville

parent c6c7788fe2

commit 45fe142cef

1 changed files with 19 additions and 12 deletions

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31

drivers/net/wireless/iwlegacy/3945.c

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