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qeth: enable scatter/gather in layer 2 mode

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The patch enables NETIF_F_SG flag for OSA in layer 2 mode.
It also adds performance accounting for fragmented sends,
adds a conditional skb_linearize() attempt if the skb had
too many fragments for QDIO SBAL, and fills netdevice->gso_*
attributes.

Signed-off-by: Eugene Crosser <Eugene.Crosser@ru.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Lakhvich Dmitriy <ldmitriy@ru.ibm.com>
Reviewed-by: Thomas Richter <tmricht@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eugene Crosser 2016-06-16 16:18:55 +02:00 committed by David S. Miller
parent 8bad55f8ce
commit d52aec97e5
1 changed files with 25 additions and 1 deletions
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26
drivers/s390/net/qeth_l2_main.c
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@ -869,6 +869,7 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
int data_offset = -1;
int elements_needed = 0;
int hd_len = 0;
int nr_frags;
if (card->qdio.do_prio_queueing || (cast_type &&
card->info.is_multicast_different))
@ -892,6 +893,17 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
}
netif_stop_queue(dev);
/* fix hardware limitation: as long as we do not have sbal
* chaining we can not send long frag lists
*/
if ((card->info.type != QETH_CARD_TYPE_IQD) &&
!qeth_get_elements_no(card, new_skb, 0)) {
if (skb_linearize(new_skb))
goto tx_drop;
if (card->options.performance_stats)
card->perf_stats.tx_lin++;
}
if (card->info.type == QETH_CARD_TYPE_OSN)
hdr = (struct qeth_hdr *)skb->data;
else {
@ -943,6 +955,14 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (!rc) {
card->stats.tx_packets++;
card->stats.tx_bytes += tx_bytes;
if (card->options.performance_stats) {
nr_frags = skb_shinfo(new_skb)->nr_frags;
if (nr_frags) {
card->perf_stats.sg_skbs_sent++;
/* nr_frags + skb->data */
card->perf_stats.sg_frags_sent += nr_frags + 1;
}
}
if (new_skb != skb)
dev_kfree_skb_any(skb);
rc = NETDEV_TX_OK;
@ -1118,12 +1138,16 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
&qeth_l2_ethtool_ops : &qeth_l2_osn_ops;
card->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
if (card->info.type == QETH_CARD_TYPE_OSD && !card->info.guestlan) {
card->dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
card->dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
NETIF_F_SG;
/* Turn on RX offloading per default */
card->dev->features |= NETIF_F_RXCSUM;
}
card->info.broadcast_capable = 1;
qeth_l2_request_initial_mac(card);
card->dev->gso_max_size = (QETH_MAX_BUFFER_ELEMENTS(card) - 1) *
PAGE_SIZE;
card->dev->gso_max_segs = (QETH_MAX_BUFFER_ELEMENTS(card) - 1);
SET_NETDEV_DEV(card->dev, &card->gdev->dev);
netif_napi_add(card->dev, &card->napi, qeth_l2_poll, QETH_NAPI_WEIGHT);
netif_carrier_off(card->dev);