net: dynamic ingress_queue allocation

ingress being not used very much, and net_device->ingress_queue being
quite a big object (128 or 256 bytes), use a dynamic allocation if
needed (tc qdisc add dev eth0 ingress ...)

dev_ingress_queue(dev) helper should be used only with RTNL taken.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 4 deletions

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 545278a1c478..3d57681bdb76 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -753,7 +753,8 @@ void dev_activate(struct net_device *dev)
 
         need_watchdog = 0;
         netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog);
-        transition_one_qdisc(dev, &dev->ingress_queue, NULL);
+        if (dev_ingress_queue(dev))
+                transition_one_qdisc(dev, dev_ingress_queue(dev), NULL);
 
         if (need_watchdog) {
                 dev->trans_start = jiffies;
@@ -812,7 +813,8 @@ static bool some_qdisc_is_busy(struct net_device *dev)
 void dev_deactivate(struct net_device *dev)
 {
         netdev_for_each_tx_queue(dev, dev_deactivate_queue, &noop_qdisc);
-        dev_deactivate_queue(dev, &dev->ingress_queue, &noop_qdisc);
+        if (dev_ingress_queue(dev))
+                dev_deactivate_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
 
         dev_watchdog_down(dev);
 
@@ -838,7 +840,8 @@ void dev_init_scheduler(struct net_device *dev)
 {
         dev->qdisc = &noop_qdisc;
         netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc);
-        dev_init_scheduler_queue(dev, &dev->ingress_queue, &noop_qdisc);
+        if (dev_ingress_queue(dev))
+                dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
 
         setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev);
 }
@@ -861,7 +864,8 @@ static void shutdown_scheduler_queue(struct net_device *dev,
 void dev_shutdown(struct net_device *dev)
 {
         netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
-        shutdown_scheduler_queue(dev, &dev->ingress_queue, &noop_qdisc);
+        if (dev_ingress_queue(dev))
+                shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
         qdisc_destroy(dev->qdisc);
         dev->qdisc = &noop_qdisc;