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authorDavid S. Miller <davem@davemloft.net>2008-08-17 21:51:03 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-17 21:51:03 -0700
commita9312ae89324438b0edc554eb36c3ec6bf927d04 (patch)
tree8a440aa75a9ac5aba1447082ec43ed48951aa121 /net/core
parent08013fa353fdcfc0a03cae805393abfc56722387 (diff)
pkt_sched: Add 'deactivated' state.
This new state lets dev_deactivate() mark a qdisc as having been deactivated. dev_queue_xmit() and ing_filter() check for this bit and do not try to process the qdisc if the bit is set. dev_deactivate() polls the qdisc after setting the bit, waiting for both __QDISC_STATE_RUNNING and __QDISC_STATE_SCHED to clear. This isn't perfect yet, but subsequent changesets will make it so. This part is just one piece of the puzzle. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/dev.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 600bb23c4c2e..d9e31f63aded 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1800,6 +1800,12 @@ gso:
spin_lock(root_lock);
+ if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
+ spin_unlock(root_lock);
+ rc = NET_XMIT_DROP;
+ goto out_kfree_skb;
+ }
+
rc = qdisc_enqueue_root(skb, q);
qdisc_run(q);
@@ -2084,7 +2090,8 @@ static int ing_filter(struct sk_buff *skb)
q = rxq->qdisc;
if (q != &noop_qdisc) {
spin_lock(qdisc_lock(q));
- result = qdisc_enqueue_root(skb, q);
+ if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
+ result = qdisc_enqueue_root(skb, q);
spin_unlock(qdisc_lock(q));
}

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