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net: check the return value of ndo_select_queue()

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Check the return value of ndo_select_queue(). If the value isn't smaller
than the real_num_tx_queues, print a warning message, and reset it to zero.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
----
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-11-13 21:54:04 +00:00 committed by David S. Miller
parent 9c2b5bdee1
commit ed04642f75
1 changed files with 15 additions and 0 deletions
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15
net/core/dev.c
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@ -1848,6 +1848,20 @@ u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
}
EXPORT_SYMBOL(skb_tx_hash);
static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
{
if (unlikely(queue_index >= dev->real_num_tx_queues)) {
if (net_ratelimit()) {
WARN(1, "%s selects TX queue %d, but "
"real number of TX queues is %d\n",
dev->name, queue_index,
dev->real_num_tx_queues);
}
return 0;
}
return queue_index;
}
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
struct sk_buff *skb)
{
@ -1861,6 +1875,7 @@ static struct netdev_queue *dev_pick_tx(struct net_device *dev,
if (ops->ndo_select_queue) {
queue_index = ops->ndo_select_queue(dev, skb);
queue_index = dev_cap_txqueue(dev, queue_index);
} else {
queue_index = 0;
if (dev->real_num_tx_queues > 1)