pkt_sched: Schedule qdiscs instead of netdev_queue.
When we have shared qdiscs, packets come out of the qdiscs
for multiple transmit queues.
Therefore it doesn't make any sense to schedule the transmit
queue when logically we cannot know ahead of time the TX
queue of the SKB that the qdisc->dequeue() will give us.
Just for sanity I added a BUG check to make sure we never
get into a state where the noop_qdisc is scheduled.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9240a95..1e839fa 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -275,7 +275,6 @@
{
__LINK_STATE_START,
__LINK_STATE_PRESENT,
- __LINK_STATE_SCHED,
__LINK_STATE_NOCARRIER,
__LINK_STATE_LINKWATCH_PENDING,
__LINK_STATE_DORMANT,
@@ -452,7 +451,6 @@
int xmit_lock_owner;
struct Qdisc *qdisc_sleeping;
struct list_head qdisc_list;
- struct netdev_queue *next_sched;
} ____cacheline_aligned_in_smp;
/*
@@ -969,7 +967,7 @@
*/
struct softnet_data
{
- struct netdev_queue *output_queue;
+ struct Qdisc *output_queue;
struct sk_buff_head input_pkt_queue;
struct list_head poll_list;
struct sk_buff *completion_queue;
@@ -984,12 +982,12 @@
#define HAVE_NETIF_QUEUE
-extern void __netif_schedule(struct netdev_queue *txq);
+extern void __netif_schedule(struct Qdisc *q);
static inline void netif_schedule_queue(struct netdev_queue *txq)
{
if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
- __netif_schedule(txq);
+ __netif_schedule(txq->qdisc);
}
static inline void netif_tx_schedule_all(struct net_device *dev)
@@ -1042,7 +1040,7 @@
}
#endif
if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
- __netif_schedule(dev_queue);
+ __netif_schedule(dev_queue->qdisc);
}
static inline void netif_wake_queue(struct net_device *dev)
@@ -1186,7 +1184,7 @@
return;
#endif
if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
- __netif_schedule(txq);
+ __netif_schedule(txq->qdisc);
}
/**
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 06a442d..e4e3005 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -84,15 +84,12 @@
struct nlattr *tab);
extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
-extern void __qdisc_run(struct netdev_queue *txq);
+extern void __qdisc_run(struct Qdisc *q);
-static inline void qdisc_run(struct netdev_queue *txq)
+static inline void qdisc_run(struct Qdisc *q)
{
- struct Qdisc *q = txq->qdisc;
-
- if (!netif_tx_queue_stopped(txq) &&
- !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state))
- __qdisc_run(txq);
+ if (!test_and_set_bit(__QDISC_STATE_RUNNING, &q->state))
+ __qdisc_run(q);
}
extern int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp,
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 9241782..3cc4b5c 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -26,6 +26,7 @@
enum qdisc_state_t
{
__QDISC_STATE_RUNNING,
+ __QDISC_STATE_SCHED,
};
struct Qdisc
@@ -45,6 +46,7 @@
struct sk_buff *gso_skb;
struct sk_buff_head q;
struct netdev_queue *dev_queue;
+ struct Qdisc *next_sched;
struct list_head list;
struct gnet_stats_basic bstats;