Commit ce8a75f6 authored Oct 16, 2017 by Jesus Sanchez-Palencia Committed by Jeff Kirsher Oct 27, 2017

net/sched: Change behavior of mq select_queue()



Currently, the class_ops select_queue() implementation on sch_mq
returns a pointer to netdev_queue #0 when it receives and invalid
qdisc id. That can be misleading since all of mq's inner qdiscs are
attached to a valid netdev_queue.

Here we fix that by returning NULL when a qdisc id is invalid. This is
aligned with how select_queue() is implemented for sch_mqprio in the
next patch on this series, keeping a consistent behavior between these
two qdiscs.

Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Tested-by: Henrik Austad <henrik@austad.us>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

parent 26aa0459

net/sched/sch_mq.c

+1 −9

Original line number	Diff line number	Diff line
		@@ -130,15 +130,7 @@ static struct netdev_queue mq_queue_get(struct Qdisc sch, unsigned long cl)
		static struct netdev_queue mq_select_queue(struct Qdisc sch,
		struct tcmsg *tcm)
		{
		unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
		struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);

		if (!dev_queue) {
		struct net_device *dev = qdisc_dev(sch);

		return netdev_get_tx_queue(dev, 0);
		}
		return dev_queue;
		return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
		}

		static int mq_graft(struct Qdisc sch, unsigned long cl, struct Qdisc new,