s390/qeth: allocate skb from NAPI cache

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napi_alloc_skb() doesn't need to disable IRQs during the allocation,
and thus may save us a few cycles.
Doing so requires a small fix-up in the HiperTransport path, which
currently assumes a fixed NET_SKB_PAD headroom padding. napi_alloc_skb()
adds an additional NET_IP_ALIGN padding, so use the proper helper for
setting up the mac_header offset.

Use this opportunity to convert the non-NAPI path to netdev_alloc_skb(),
which means that skb->dev is now always set-up during allocation and
doesn't need to be assigned manually.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Julian Wiedmann 2018-03-09 18:12:57 +01:00 • committed by David S. Miller

parent f0ea8bfbc1

commit 37cf05d2ff

3 changed files with 4 additions and 6 deletions

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5

drivers/s390/net/qeth_core_main.c

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1

drivers/s390/net/qeth_l2_main.c

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4

drivers/s390/net/qeth_l3_main.c

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