linux-kernel - [PATCH net-next V2] tun/macvtap: use consume_skb() instead of kfree

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Message-Id: <1416987810-23263-1-git-send-email-jasowang@redhat.com>
Date:	Wed, 26 Nov 2014 15:43:30 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	mst@...hat.com, Jason Wang <jasowang@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next V2] tun/macvtap: use consume_skb() instead of kfree_skb() when needed

To be more friendly with drop monitor, we should only call kfree_skb() when
the packets were dropped and use consume_skb() in other cases.

Cc: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
Changes from V1:
- check the return value of tun/macvtap_put_user()
---
 drivers/net/macvtap.c | 5 ++++-
 drivers/net/tun.c     | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 42a80d3..c171ab6 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -862,7 +862,10 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q,
 		}
 		iov_iter_init(&iter, READ, iv, segs, len);
 		ret = macvtap_put_user(q, skb, &iter);
-		kfree_skb(skb);
+		if (ret < 0)
+			kfree_skb(skb);
+		else
+			consume_skb(skb);
 		break;
 	}
 
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ac53a73..a21c130 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1363,7 +1363,10 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
 
 	iov_iter_init(&iter, READ, iv, segs, len);
 	ret = tun_put_user(tun, tfile, skb, &iter);
-	kfree_skb(skb);
+	if (ret < 0)
+		kfree_skb(skb);
+	else
+		consume_skb(skb);
 
 	return ret;
 }
-- 
1.9.1

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