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s390/qeth: speed up L2 IQD xmit 

Modify the L2 OSA xmit path so that it also supports L2 IQD devices
(in particular, their HW header requirements). This allows IQD devices
to advertise NETIF_F_SG support, and eliminates the allocation overhead
for the HW header.

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 2018-07-19 12:43:58 +02:00 committed by David S. Miller
parent a7c2f4a332
commit 5f89eca577
3 changed files with 30 additions and 56 deletions
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7
drivers/s390/net/qeth_core_main.c
View File

@ -5731,6 +5731,13 @@ static struct net_device *qeth_alloc_netdev(struct qeth_card *card)
dev->mtu = 0;
SET_NETDEV_DEV(dev, &card->gdev->dev);
netif_carrier_off(dev);
if (!IS_OSN(card)) {
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->hw_features |= NETIF_F_SG;
dev->vlan_features |= NETIF_F_SG;
}
return dev;
}

76
drivers/s390/net/qeth_l2_main.c
View File

@ -641,37 +641,13 @@ static void qeth_l2_set_rx_mode(struct net_device *dev)
qeth_promisc_to_bridge(card);
}
static int qeth_l2_xmit_iqd(struct qeth_card *card, struct sk_buff *skb,
struct qeth_qdio_out_q *queue, int cast_type)
{
unsigned int data_offset = ETH_HLEN;
struct qeth_hdr *hdr;
int rc;
hdr = kmem_cache_alloc(qeth_core_header_cache, GFP_ATOMIC);
if (!hdr)
return -ENOMEM;
qeth_l2_fill_header(hdr, skb, cast_type, skb->len);
skb_copy_from_linear_data(skb, ((char *)hdr) + sizeof(*hdr),
data_offset);
if (!qeth_get_elements_no(card, skb, 1, data_offset)) {
rc = -E2BIG;
goto out;
}
rc = qeth_do_send_packet_fast(queue, skb, hdr, data_offset,
sizeof(*hdr) + data_offset);
out:
if (rc)
kmem_cache_free(qeth_core_header_cache, hdr);
return rc;
}
static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb,
struct qeth_qdio_out_q *queue, int cast_type,
int ipv)
static int qeth_l2_xmit(struct qeth_card *card, struct sk_buff *skb,
struct qeth_qdio_out_q *queue, int cast_type, int ipv)
{
const unsigned int proto_len = IS_IQD(card) ? ETH_HLEN : 0;
const unsigned int hw_hdr_len = sizeof(struct qeth_hdr);
unsigned int frame_len = skb->len;
unsigned int data_offset = 0;
struct qeth_hdr *hdr = NULL;
unsigned int hd_len = 0;
unsigned int elements;
@ -682,15 +658,16 @@ static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb,
if (rc)
return rc;
push_len = qeth_add_hw_header(card, skb, &hdr, hw_hdr_len, 0,
push_len = qeth_add_hw_header(card, skb, &hdr, hw_hdr_len, proto_len,
&elements);
if (push_len < 0)
return push_len;
if (!push_len) {
/* hdr was allocated from cache */
hd_len = sizeof(*hdr);
/* HW header needs its own buffer element. */
hd_len = hw_hdr_len + proto_len;
data_offset = proto_len;
}
qeth_l2_fill_header(hdr, skb, cast_type, skb->len - push_len);
qeth_l2_fill_header(hdr, skb, cast_type, frame_len);
if (skb->ip_summed == CHECKSUM_PARTIAL) {
qeth_tx_csum(skb, &hdr->hdr.l2.flags[1], ipv);
if (card->options.performance_stats)
@ -698,9 +675,15 @@ static int qeth_l2_xmit_osa(struct qeth_card *card, struct sk_buff *skb,
}
is_sg = skb_is_nonlinear(skb);
/* TODO: remove the skb_orphan() once TX completion is fast enough */
skb_orphan(skb);
rc = qeth_do_send_packet(card, queue, skb, hdr, 0, hd_len, elements);
if (IS_IQD(card)) {
rc = qeth_do_send_packet_fast(queue, skb, hdr, data_offset,
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, data_offset,
hd_len, elements);
}
if (!rc) {
if (card->options.performance_stats) {
@ -759,16 +742,10 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
}
netif_stop_queue(dev);
switch (card->info.type) {
case QETH_CARD_TYPE_OSN:
if (IS_OSN(card))
rc = qeth_l2_xmit_osn(card, skb, queue);
break;
case QETH_CARD_TYPE_IQD:
rc = qeth_l2_xmit_iqd(card, skb, queue, cast_type);
break;
default:
rc = qeth_l2_xmit_osa(card, skb, queue, cast_type, ipv);
}
else
rc = qeth_l2_xmit(card, skb, queue, cast_type, ipv);
if (!rc) {
card->stats.tx_packets++;
@ -927,6 +904,7 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
card->dev->flags |= IFF_NOARP;
} else {
card->dev->ethtool_ops = &qeth_l2_ethtool_ops;
card->dev->needed_headroom = sizeof(struct qeth_hdr);
}
if (card->info.type == QETH_CARD_TYPE_OSM)
@ -934,14 +912,6 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
else
card->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
if (card->info.type != QETH_CARD_TYPE_OSN &&
card->info.type != QETH_CARD_TYPE_IQD) {
card->dev->priv_flags &= ~IFF_TX_SKB_SHARING;
card->dev->needed_headroom = sizeof(struct qeth_hdr);
card->dev->hw_features |= NETIF_F_SG;
card->dev->vlan_features |= NETIF_F_SG;
}
if (card->info.type == QETH_CARD_TYPE_OSD && !card->info.guestlan) {
card->dev->features |= NETIF_F_SG;
/* OSA 3S and earlier has no RX/TX support */

3
drivers/s390/net/qeth_l3_main.c
View File

@ -2556,13 +2556,10 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
return -ENODEV;
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;
card->dev->hw_features |= NETIF_F_SG;
card->dev->vlan_features |= NETIF_F_SG;
netif_keep_dst(card->dev);
if (card->dev->hw_features & NETIF_F_TSO)