Commit 26cfea3c authored by Peter Oskolkov's avatar Peter Oskolkov Committed by Greg Kroah-Hartman

net: modify skb_rbtree_purge to return the truesize of all purged skbs.

commit 385114dec8a49b5e5945e77ba7de6356106713f4 upstream.

Tested: see the next patch is the series.
Suggested-by: default avatarEric Dumazet <>
Signed-off-by: default avatarPeter Oskolkov <>
Signed-off-by: default avatarEric Dumazet <>
Cc: Florian Westphal <>
Signed-off-by: default avatarDavid S. Miller <>
Signed-off-by: default avatarMao Wenan <>
Signed-off-by: default avatarBen Hutchings <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent ef0f963d
......@@ -2278,7 +2278,7 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
void skb_rbtree_purge(struct rb_root *root);
unsigned int skb_rbtree_purge(struct rb_root *root);
void *netdev_alloc_frag(unsigned int fragsz);
......@@ -2380,23 +2380,27 @@ EXPORT_SYMBOL(skb_queue_purge);
* skb_rbtree_purge - empty a skb rbtree
* @root: root of the rbtree to empty
* Return value: the sum of truesizes of all purged skbs.
* Delete all buffers on an &sk_buff rbtree. Each buffer is removed from
* the list and one reference dropped. This function does not take
* any lock. Synchronization should be handled by the caller (e.g., TCP
* out-of-order queue is protected by the socket lock).
void skb_rbtree_purge(struct rb_root *root)
unsigned int skb_rbtree_purge(struct rb_root *root)
struct rb_node *p = rb_first(root);
unsigned int sum = 0;
while (p) {
struct sk_buff *skb = rb_entry(p, struct sk_buff, rbnode);
p = rb_next(p);
rb_erase(&skb->rbnode, root);
sum += skb->truesize;
return sum;
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