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Network Drop Monitor: Adding kfree_skb_clean for non-drops and modifying end-of-line points for skbs

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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>
This commit is contained in:
Neil Horman 2009-03-11 09:49:55 +00:00 committed by David S. Miller
parent 4893d39e86
commit ead2ceb0ec
6 changed files with 29 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/skbuff.h
View File

@ -421,6 +421,7 @@ extern void skb_dma_unmap(struct device *dev, struct sk_buff *skb,
#endif
extern void kfree_skb(struct sk_buff *skb);
extern void consume_skb(struct sk_buff *skb);
extern void __kfree_skb(struct sk_buff *skb);
extern struct sk_buff *__alloc_skb(unsigned int size,
gfp_t priority, int fclone, int node);
@ -459,7 +460,8 @@ extern int skb_to_sgvec(struct sk_buff *skb,
extern int skb_cow_data(struct sk_buff *skb, int tailbits,
struct sk_buff **trailer);
extern int skb_pad(struct sk_buff *skb, int pad);
#define dev_kfree_skb(a) kfree_skb(a)
#define dev_kfree_skb(a) consume_skb(a)
#define dev_consume_skb(a) kfree_skb_clean(a)
extern void skb_over_panic(struct sk_buff *skb, int len,
void *here);
extern void skb_under_panic(struct sk_buff *skb, int len,

2
net/core/datagram.c
View File

@ -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);
}

22
net/core/skbuff.c
View File

@ -65,6 +65,7 @@
#include <asm/uaccess.h>
#include <asm/system.h>
#include <trace/skb.h>
#include "kmap_skb.h"
@ -442,10 +443,31 @@ 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

2
net/ipv4/arp.c
View File

@ -892,7 +892,7 @@ static int arp_process(struct sk_buff *skb)
out:
if (in_dev)
in_dev_put(in_dev);
kfree_skb(skb);
consume_skb(skb);
return 0;
}

2
net/ipv4/udp.c
View File

@ -1184,7 +1184,7 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
sk = sknext;
} while (sknext);
} else
kfree_skb(skb);
consume_skb(skb);
spin_unlock(&hslot->lock);
return 0;
}

2
net/packet/af_packet.c
View File

@ -584,7 +584,7 @@ drop_n_restore:
skb->len = skb_len;
}
drop:
kfree_skb(skb);
consume_skb(skb);
return 0;
}