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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>
This commit is contained in:
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
View File

@ -2835,7 +2835,8 @@ static int qeth_init_input_buffer(struct qeth_card *card,
int i;
if ((card->options.cq == QETH_CQ_ENABLED) && (!buf->rx_skb)) {
buf->rx_skb = dev_alloc_skb(QETH_RX_PULL_LEN + ETH_HLEN);
buf->rx_skb = netdev_alloc_skb(card->dev,
QETH_RX_PULL_LEN + ETH_HLEN);
if (!buf->rx_skb)
return 1;
}
@ -5325,7 +5326,7 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card,
} else {
unsigned int linear = (use_rx_sg) ? QETH_RX_PULL_LEN : skb_len;
skb = dev_alloc_skb(linear + headroom);
skb = napi_alloc_skb(&card->napi, linear + headroom);
}
if (!skb)
goto no_mem;

1
drivers/s390/net/qeth_l2_main.c
View File

@ -437,7 +437,6 @@ static int qeth_l2_process_inbound_buffer(struct qeth_card *card,
*done = 1;
break;
}
skb->dev = card->dev;
switch (hdr->hdr.l2.id) {
case QETH_HEADER_TYPE_LAYER2:
skb->pkt_type = PACKET_HOST;

4
drivers/s390/net/qeth_l3_main.c
View File

@ -1572,7 +1572,6 @@ static int qeth_l3_process_inbound_buffer(struct qeth_card *card,
*done = 1;
break;
}
skb->dev = card->dev;
switch (hdr->hdr.l3.id) {
case QETH_HEADER_TYPE_LAYER3:
magic = *(__u16 *)skb->data;
@ -1580,11 +1579,10 @@ static int qeth_l3_process_inbound_buffer(struct qeth_card *card,
(magic == ETH_P_AF_IUCV)) {
skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
skb->pkt_type = PACKET_HOST;
skb->mac_header = NET_SKB_PAD;
skb->dev = card->dev;
len = skb->len;
card->dev->header_ops->create(skb, card->dev, 0,
card->dev->dev_addr, "FAKELL", len);
skb_reset_mac_header(skb);
netif_receive_skb(skb);
} else {
qeth_l3_rebuild_skb(card, skb, hdr);