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qeth: omit outbound queue 3 for unicast packets in Priority Queuing on HiperSockets 

On HiperSockets only outbound queues 0 to 2 are available for unicast
packets. Current Priority Queuing implementation in the qeth driver puts
outgoing packets in outbound queues 0 to 3.

This puts outgoing unicast packets into outbound queue 2 instead of
outbound queue 3 when using Priority Queuing on a HiperSocket.
Additionally, the default outbound queue cannot be set to outbound queue 3
on HiperSockets.

Signed-off-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hans Wippel 2016-06-16 16:19:02 +02:00 committed by David S. Miller
parent 6c7cd71244
commit 70deb01662
2 changed files with 17 additions and 4 deletions
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17
drivers/s390/net/qeth_core_main.c
View File

@ -3748,6 +3748,14 @@ void qeth_qdio_output_handler(struct ccw_device *ccwdev,
}
EXPORT_SYMBOL_GPL(qeth_qdio_output_handler);
/* We cannot use outbound queue 3 for unicast packets on HiperSockets */
static inline int qeth_cut_iqd_prio(struct qeth_card *card, int queue_num)
{
if ((card->info.type == QETH_CARD_TYPE_IQD) && (queue_num == 3))
return 2;
return queue_num;
}
/**
* Note: Function assumes that we have 4 outbound queues.
*/
@ -3775,9 +3783,9 @@ int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb,
return card->qdio.default_out_queue;
}
if (card->qdio.do_prio_queueing == QETH_PRIO_Q_ING_PREC)
return ~tos >> 6 & 3;
return qeth_cut_iqd_prio(card, ~tos >> 6 & 3);
if (tos & IPTOS_MINCOST)
return 3;
return qeth_cut_iqd_prio(card, 3);
if (tos & IPTOS_RELIABILITY)
return 2;
if (tos & IPTOS_THROUGHPUT)
@ -3788,11 +3796,12 @@ int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb,
case QETH_PRIO_Q_ING_SKB:
if (skb->priority > 5)
return 0;
return ~skb->priority >> 1 & 3;
return qeth_cut_iqd_prio(card, ~skb->priority >> 1 & 3);
case QETH_PRIO_Q_ING_VLAN:
tci = &((struct ethhdr *)skb->data)->h_proto;
if (*tci == ETH_P_8021Q)
return ~*(tci + 1) >> (VLAN_PRIO_SHIFT + 1) & 3;
return qeth_cut_iqd_prio(card, ~*(tci + 1) >>
(VLAN_PRIO_SHIFT + 1) & 3);
break;
default:
break;

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

@ -243,6 +243,10 @@ static ssize_t qeth_dev_prioqing_store(struct device *dev,
card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING;
card->qdio.default_out_queue = 2;
} else if (sysfs_streq(buf, "no_prio_queueing:3")) {
if (card->info.type == QETH_CARD_TYPE_IQD) {
rc = -EPERM;
goto out;
}
card->qdio.do_prio_queueing = QETH_NO_PRIO_QUEUEING;
card->qdio.default_out_queue = 3;
} else if (sysfs_streq(buf, "no_prio_queueing")) {