diff options
| author | Neil Horman <nhorman@tuxdriver.com> | 2009-03-11 09:49:55 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-13 12:09:28 -0700 |
| commit | ead2ceb0ec9f85cff19c43b5cdb2f8a054484431 (patch) | |
| tree | 258874b824bf241698d943daa9298bb18955e451 /net/core | |
| parent | 4893d39e865b2897bf9fcd329697d37032d853a1 (diff) | |
| download | linux-ead2ceb0ec9f85cff19c43b5cdb2f8a054484431.tar.bz2 | |
Network Drop Monitor: Adding kfree_skb_clean for non-drops and modifying end-of-line points for skbs
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
include/linux/skbuff.h | 4 +++-
net/core/datagram.c | 2 +-
net/core/skbuff.c | 22 ++++++++++++++++++++++
net/ipv4/arp.c | 2 +-
net/ipv4/udp.c | 2 +-
net/packet/af_packet.c | 2 +-
6 files changed, 29 insertions(+), 5 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/datagram.c | 2 | ||||
| -rw-r--r-- | net/core/skbuff.c | 22 |
2 files changed, 23 insertions, 1 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index 5e2ac0c4b07c..d0de644b378d 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -208,7 +208,7 @@ struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, void skb_free_datagram(struct sock *sk, struct sk_buff *skb) { - kfree_skb(skb); + consume_skb(skb); sk_mem_reclaim_partial(sk); } diff --git a/net/core/skbuff.c b/net/core/skbuff.c index e5e2111a397d..6acbf9e79eb1 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -65,6 +65,7 @@ #include <asm/uaccess.h> #include <asm/system.h> +#include <trace/skb.h> #include "kmap_skb.h" @@ -442,11 +443,32 @@ void kfree_skb(struct sk_buff *skb) smp_rmb(); else if (likely(!atomic_dec_and_test(&skb->users))) return; + trace_kfree_skb(skb, __builtin_return_address(0)); __kfree_skb(skb); } EXPORT_SYMBOL(kfree_skb); /** + * consume_skb - free an skbuff + * @skb: buffer to free + * + * Drop a ref to the buffer and free it if the usage count has hit zero + * Functions identically to kfree_skb, but kfree_skb assumes that the frame + * is being dropped after a failure and notes that + */ +void consume_skb(struct sk_buff *skb) +{ + if (unlikely(!skb)) + return; + if (likely(atomic_read(&skb->users) == 1)) + smp_rmb(); + else if (likely(!atomic_dec_and_test(&skb->users))) + return; + __kfree_skb(skb); +} +EXPORT_SYMBOL(consume_skb); + +/** * skb_recycle_check - check if skb can be reused for receive * @skb: buffer * @skb_size: minimum receive buffer size |