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Message-Id: <20080717.051825.179223431.davem@davemloft.net>
Date: Thu, 17 Jul 2008 05:18:25 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
CC: kaber@...sh.net, johannes@...solutions.net,
linux-wireless@...r.kernel.org
Subject: [PATCH 29/31]: pkt_sched: Add multiqueue handling to qdisc_graft().
Move the destruction of the old queue into qdisc_graft().
When operating on a root qdisc (ie. "parent == NULL"), apply
the operation to all queues. The caller has grabbed a single
implicit reference for this graft, therefore when we apply the
change to more than one queue we must grab additional qdisc
references.
Otherwise, we are operating on a class of a specific parent qdisc, and
therefore no multiqueue handling is necessary.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
net/sched/sch_api.c | 101 ++++++++++++++++++++++++++++++---------------------
1 files changed, 59 insertions(+), 42 deletions(-)
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 7492489..b3ef830 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -435,28 +435,22 @@ static u32 qdisc_alloc_handle(struct net_device *dev)
return i>0 ? autohandle : 0;
}
-/* Attach toplevel qdisc to device dev */
+/* Attach toplevel qdisc to device queue. */
-static struct Qdisc *
-dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc)
+static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
+ struct Qdisc *qdisc)
{
- struct netdev_queue *dev_queue;
spinlock_t *root_lock;
struct Qdisc *oqdisc;
int ingress;
- if (dev->flags & IFF_UP)
- dev_deactivate(dev);
-
ingress = 0;
if (qdisc && qdisc->flags&TCQ_F_INGRESS)
ingress = 1;
if (ingress) {
- dev_queue = &dev->rx_queue;
oqdisc = dev_queue->qdisc;
} else {
- dev_queue = netdev_get_tx_queue(dev, 0);
oqdisc = dev_queue->qdisc_sleeping;
}
@@ -487,9 +481,6 @@ dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc)
spin_unlock_bh(root_lock);
- if (dev->flags & IFF_UP)
- dev_activate(dev);
-
return oqdisc;
}
@@ -521,26 +512,66 @@ void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
}
EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
-/* Graft qdisc "new" to class "classid" of qdisc "parent" or
- to device "dev".
+static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid,
+ struct Qdisc *old, struct Qdisc *new)
+{
+ if (new || old)
+ qdisc_notify(skb, n, clid, old, new);
- Old qdisc is not destroyed but returned in *old.
+ if (old) {
+ spin_lock_bh(&old->q.lock);
+ qdisc_destroy(old);
+ spin_unlock_bh(&old->q.lock);
+ }
+}
+
+/* Graft qdisc "new" to class "classid" of qdisc "parent" or
+ * to device "dev".
+ *
+ * When appropriate send a netlink notification using 'skb'
+ * and "n".
+ *
+ * On success, destroy old qdisc.
*/
static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
- u32 classid,
- struct Qdisc *new, struct Qdisc **old)
+ struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
+ struct Qdisc *new, struct Qdisc *old)
{
+ struct Qdisc *q = old;
int err = 0;
- struct Qdisc *q = *old;
-
if (parent == NULL) {
- if (q && q->flags&TCQ_F_INGRESS) {
- *old = dev_graft_qdisc(dev, q);
- } else {
- *old = dev_graft_qdisc(dev, new);
+ unsigned int i, num_q, ingress;
+
+ ingress = 0;
+ num_q = dev->num_tx_queues;
+ if (q && q->flags & TCQ_F_INGRESS) {
+ num_q = 1;
+ ingress = 1;
}
+
+ if (dev->flags & IFF_UP)
+ dev_deactivate(dev);
+
+ for (i = 0; i < num_q; i++) {
+ struct netdev_queue *dev_queue = &dev->rx_queue;
+
+ if (!ingress)
+ dev_queue = netdev_get_tx_queue(dev, i);
+
+ if (ingress) {
+ old = dev_graft_qdisc(dev_queue, q);
+ } else {
+ old = dev_graft_qdisc(dev_queue, new);
+ if (new && i > 0)
+ atomic_inc(&new->refcnt);
+ }
+ notify_and_destroy(skb, n, classid, old, new);
+ }
+
+ if (dev->flags & IFF_UP)
+ dev_activate(dev);
} else {
const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
@@ -549,10 +580,12 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
if (cops) {
unsigned long cl = cops->get(parent, classid);
if (cl) {
- err = cops->graft(parent, cl, new, old);
+ err = cops->graft(parent, cl, new, &old);
cops->put(parent, cl);
}
}
+ if (!err)
+ notify_and_destroy(skb, n, classid, old, new);
}
return err;
}
@@ -773,16 +806,8 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
return -EINVAL;
if (q->handle == 0)
return -ENOENT;
- if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0)
+ if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0)
return err;
- if (q) {
- spinlock_t *root_lock = qdisc_root_lock(q);
-
- qdisc_notify(skb, n, clid, q, NULL);
- spin_unlock_bh(root_lock);
- qdisc_destroy(q);
- spin_unlock_bh(root_lock);
- }
} else {
qdisc_notify(skb, n, clid, NULL, q);
}
@@ -923,10 +948,9 @@ create_n_graft:
graft:
if (1) {
- struct Qdisc *old_q = NULL;
spinlock_t *root_lock;
- err = qdisc_graft(dev, p, clid, q, &old_q);
+ err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
if (err) {
if (q) {
root_lock = qdisc_root_lock(q);
@@ -936,13 +960,6 @@ graft:
}
return err;
}
- qdisc_notify(skb, n, clid, old_q, q);
- if (old_q) {
- root_lock = qdisc_root_lock(old_q);
- spin_lock_bh(root_lock);
- qdisc_destroy(old_q);
- spin_unlock_bh(root_lock);
- }
}
return 0;
}
--
1.5.6.2.255.gbed62
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