linux-kernel - [PATCH 4.4 57/65] net: modify skb_rbtree_purge to return the truesize of all purged skbs.

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Message-Id: <20190204103619.936365012@linuxfoundation.org>
Date:   Mon,  4 Feb 2019 11:36:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Peter Oskolkov <posk@...gle.com>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Mao Wenan <maowenan@...wei.com>
Subject: [PATCH 4.4 57/65] net: modify skb_rbtree_purge to return the truesize of all purged skbs.

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Oskolkov <posk@...gle.com>

commit 385114dec8a49b5e5945e77ba7de6356106713f4 upstream.

Tested: see the next patch is the series.

Suggested-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Peter Oskolkov <posk@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Florian Westphal <fw@...len.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Mao Wenan <maowenan@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/skbuff.h |    2 +-
 net/core/skbuff.c      |    6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2273,7 +2273,7 @@ static inline void __skb_queue_purge(str
 		kfree_skb(skb);
 }
 
-void skb_rbtree_purge(struct rb_root *root);
+unsigned int skb_rbtree_purge(struct rb_root *root);
 
 void *netdev_alloc_frag(unsigned int fragsz);
 
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -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;
 		kfree_skb(skb);
 	}
+	return sum;
 }
 
 /**