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s390/qeth: add TX multiqueue support for OSA devices

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This adds trivial support for multiple TX queues on OSA-style devices
(both real HW and z/VM NICs). For now we expose the driver's existing
QoS mechanism via .ndo_select_queue, and adjust the number of available
TX queues when qeth_update_from_chp_desc() detects that the
HW configuration has changed.

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
2019-04-17 18:17:33 +02:00
committed by David S. Miller
parent 3a18d75400
commit 73dc2daf11
4 changed files with 51 additions and 52 deletions
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14
drivers/s390/net/qeth_l2_main.c
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@@ -602,7 +602,6 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
{
struct qeth_card *card = dev->ml_priv;
u16 txq = skb_get_queue_mapping(skb);
int ipv = qeth_get_ip_version(skb);
struct qeth_qdio_out_q *queue;
int tx_bytes = skb->len;
int rc;
@@ -610,14 +609,14 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
if (IS_IQD(card))
queue = card->qdio.out_qs[qeth_iqd_translate_txq(dev, txq)];
else
queue = qeth_get_tx_queue(card, skb, ipv);
queue = card->qdio.out_qs[txq];
netif_stop_subqueue(dev, txq);
if (IS_OSN(card))
rc = qeth_l2_xmit_osn(card, skb, queue);
else
rc = qeth_xmit(card, skb, queue, ipv,
rc = qeth_xmit(card, skb, queue, qeth_get_ip_version(skb),
qeth_l2_get_cast_type(skb), qeth_l2_fill_header);
if (!rc) {
@@ -638,8 +637,13 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
static u16 qeth_l2_select_queue(struct net_device *dev, struct sk_buff *skb,
struct net_device *sb_dev)
{
return qeth_iqd_select_queue(dev, skb, qeth_l2_get_cast_type(skb),
sb_dev);
struct qeth_card *card = dev->ml_priv;
if (IS_IQD(card))
return qeth_iqd_select_queue(dev, skb,
qeth_l2_get_cast_type(skb),
sb_dev);
return qeth_get_priority_queue(card, skb);
}
static const struct device_type qeth_l2_devtype = {