multiq: Further multiqueue cleanup

This patch resolves a few issues found with multiq including wording
suggestions and a problem seen in the allocation of queues.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/multiqueue.txt b/Documentation/networking/multiqueue.txt
index 8c2b06b..4caa0e3 100644 (file)
--- a/Documentation/networking/multiqueue.txt
+++ b/Documentation/networking/multiqueue.txt
@@ -29,15 +29,15 @@ Section 2: Qdisc support for multiqueue devices
 
 -----------------------------------------------
 
-Currently two qdiscs support multiqueue devices.  The first is the default
-pfifo_fast qdisc.  This qdisc supports one qdisc per hardware queue.  A new
-round-robin qdisc, sch_multiq also supports multiple hardware queues. The
+Currently two qdiscs are optimized for multiqueue devices.  The first is the
+default pfifo_fast qdisc.  This qdisc supports one qdisc per hardware queue.
+A new round-robin qdisc, sch_multiq also supports multiple hardware queues. The
 qdisc is responsible for classifying the skb's and then directing the skb's to
 bands and queues based on the value in skb->queue_mapping.  Use this field in
 the base driver to determine which queue to send the skb to.
 
-sch_multiq has been added for hardware that wishes to avoid unnecessary
-requeuing.  It will cycle though the bands and verify that the hardware queue
+sch_multiq has been added for hardware that wishes to avoid head-of-line
+blocking.  It will cycle though the bands and verify that the hardware queue
 associated with the band is not stopped prior to dequeuing a packet.
 
 On qdisc load, the number of bands is based on the number of queues on the
@@ -63,8 +63,8 @@ band 1 => queue 1
 band 2 => queue 2
 band 3 => queue 3
 
-Traffic will begin flowing through each queue if your base device has either
-the default simple_tx_hash or a custom netdev->select_queue() defined.
+Traffic will begin flowing through each queue based on either the simple_tx_hash
+function or based on netdev->select_queue() if you have it defined.
 
 The behavior of tc filters remains the same.  However a new tc action,
 skbedit, has been added.  Assuming you wanted to route all traffic to a

diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index 49a8b67..5d9cd68 100644 (file)
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -214,8 +214,8 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
        sch_tree_lock(sch);
        q->bands = qopt->bands;
        for (i = q->bands; i < q->max_bands; i++) {
-               struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
-               if (child != &noop_qdisc) {
+               if (q->queues[i] != &noop_qdisc) {
+                       struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
                        qdisc_tree_decrease_qlen(child, child->q.qlen);
                        qdisc_destroy(child);
                }
@@ -250,7 +250,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
 static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
 {
        struct multiq_sched_data *q = qdisc_priv(sch);
-       int i;
+       int i, err;
 
        q->queues = NULL;
 
@@ -265,7 +265,12 @@ static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
        for (i = 0; i < q->max_bands; i++)
                q->queues[i] = &noop_qdisc;
 
-       return multiq_tune(sch, opt);
+       err = multiq_tune(sch,opt);
+
+       if (err)
+               kfree(q->queues);
+
+       return err;
 }
 
 static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb)