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s390/qeth: speed-up IPv4 OSA xmit

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Move the xmit of offload-eligible (ie IPv4) traffic on OSA over to the
new, copy-free path.
As with L2, we'll need to preserve the skb_orphan() behaviour of the
old code path until TX completion is sufficiently fast.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2018-07-11 17:42:47 +02:00 committed by David S. Miller
parent a647a02512
commit fb321f25e5
1 changed files with 21 additions and 12 deletions
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33
drivers/s390/net/qeth_l3_main.c
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@ -2050,6 +2050,12 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
hdr->hdr.l3.vlan_id = skb_vlan_tag_get(skb);
}
if (!skb_is_gso(skb) && skb->ip_summed == CHECKSUM_PARTIAL) {
qeth_tx_csum(skb, &hdr->hdr.l3.ext_flags, ipv);
if (card->options.performance_stats)
card->perf_stats.tx_csum++;
}
/* OSA only: */
if (!ipv) {
hdr->hdr.l3.flags = QETH_HDR_PASSTHRU;
@ -2164,8 +2170,8 @@ static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb,
unsigned char eth_hdr[ETH_HLEN];
unsigned int hdr_elements = 0;
struct qeth_hdr *hdr = NULL;
int elements, push_len, rc;
unsigned int hd_len = 0;
int push_len, rc;
/* compress skb to fit into one IO buffer: */
if (!qeth_get_elements_no(card, skb, 0, 0)) {
@ -2199,17 +2205,26 @@ static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb,
hdr_elements = 1;
}
if (!qeth_get_elements_no(card, skb, hdr_elements, 0)) {
elements = qeth_get_elements_no(card, skb, hdr_elements, 0);
if (!elements) {
rc = -E2BIG;
goto out;
}
elements += hdr_elements;
if (skb->protocol == htons(ETH_P_AF_IUCV))
qeth_l3_fill_af_iucv_hdr(hdr, skb, frame_len);
else
qeth_l3_fill_header(card, hdr, skb, ipv, cast_type, frame_len);
rc = qeth_do_send_packet_fast(queue, skb, hdr, 0, hd_len);
if (IS_IQD(card)) {
rc = qeth_do_send_packet_fast(queue, skb, hdr, 0, hd_len);
} else {
/* TODO: drop skb_orphan() once TX completion is fast enough */
skb_orphan(skb);
rc = qeth_do_send_packet(card, queue, skb, hdr, 0, hd_len,
elements);
}
out:
if (!rc) {
if (card->options.performance_stats && nr_frags) {
@ -2295,12 +2310,6 @@ static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb,
hdr = skb_push(new_skb, sizeof(struct qeth_hdr));
qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type,
new_skb->len - sizeof(struct qeth_hdr));
if (new_skb->ip_summed == CHECKSUM_PARTIAL) {
qeth_tx_csum(new_skb, &hdr->hdr.l3.ext_flags, ipv);
if (card->options.performance_stats)
card->perf_stats.tx_csum++;
}
}
elements = use_tso ?
@ -2384,7 +2393,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
}
netif_stop_queue(dev);
if (IS_IQD(card))
if (IS_IQD(card) || (!skb_is_gso(skb) && ipv == 4))
rc = qeth_l3_xmit_offload(card, skb, queue, ipv, cast_type);
else
rc = qeth_l3_xmit(card, skb, queue, ipv, cast_type);
@ -2563,9 +2572,7 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
if (!card->dev)
return -ENODEV;
card->dev->flags |= IFF_NOARP;
card->dev->priv_flags &= ~IFF_TX_SKB_SHARING;
card->dev->netdev_ops = &qeth_l3_netdev_ops;
card->dev->needed_headroom = sizeof(struct qeth_hdr) - ETH_HLEN;
rc = qeth_l3_iqd_read_initial_mac(card);
if (rc)
@ -2582,6 +2589,8 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
card->dev->max_mtu = ETH_MAX_MTU;
card->dev->dev_port = card->info.portno;
card->dev->ethtool_ops = &qeth_l3_ethtool_ops;
card->dev->priv_flags &= ~IFF_TX_SKB_SHARING;
card->dev->needed_headroom = sizeof(struct qeth_hdr) - ETH_HLEN;
card->dev->features |= NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER;