asix: asix_rx_fixup surgery to reduce skb truesizes

asix_rx_fixup() is complex, and does some unnecessary memory copies (at
least on x86 where NET_IP_ALIGN is 0)

Also, it tends to provide skbs with a big truesize (4096+256 with
MTU=1500) to upper stack, so incoming trafic consume a lot of memory and
I noticed early packet drops because we hit socket rcvbuf too fast.

Switch to a different strategy, using copybreak so that we provide nice
skbs to upper stack (including the NET_SKB_PAD to avoid future head
reallocations in some paths)

With this patch, I no longer see packets drops or tcp collapses on
various tcp workload with a AX88772 adapter.

Signed-off-by: Eric Dumazet <[email protected]>
Cc: Aurelien Jacobs <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Trond Wuellner <[email protected]>
Cc: Grant Grundler <[email protected]>
Cc: Paul Stewart <[email protected]>
Reviewed-by: Grant Grundler <[email protected]>
Reviewed-by: Grant Grundler <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

0 files changed, 0 insertions, 0 deletions