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net: skb_queue_purge_reason() optimizations

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1) Exit early if the list is empty.

2) splice the list into a local list,
   so that we block hard irqs only once.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231003181920.3280453-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-10-03 18:19:20 +00:00 committed by Jakub Kicinski
parent 397f70e3be
commit d86e5fbd4c
1 changed files with 12 additions and 3 deletions
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15
net/core/skbuff.c
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@ -3722,10 +3722,19 @@ EXPORT_SYMBOL(skb_dequeue_tail);
void skb_queue_purge_reason(struct sk_buff_head *list,
enum skb_drop_reason reason)
{
struct sk_buff *skb;
struct sk_buff_head tmp;
unsigned long flags;
while ((skb = skb_dequeue(list)) != NULL)
kfree_skb_reason(skb, reason);
if (skb_queue_empty_lockless(list))
return;
__skb_queue_head_init(&tmp);
spin_lock_irqsave(&list->lock, flags);
skb_queue_splice_init(list, &tmp);
spin_unlock_irqrestore(&list->lock, flags);
__skb_queue_purge_reason(&tmp, reason);
}
EXPORT_SYMBOL(skb_queue_purge_reason);