Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e9b3cc1b authored by Neil Horman's avatar Neil Horman Committed by David S. Miller
Browse files

net: skb ftracer - add tracepoint to skb_copy_datagram_iovec (v3) 



skb allocation / cosumption tracer - Add consumption tracepoint

This patch adds a tracepoint to skb_copy_datagram_iovec, which is called each
time a userspace process copies a frame from a socket receive queue to a user
space buffer.  It allows us to hook in and examine each sk_buff that the system
receives on a per-socket bases, and can be use to compile a list of which skb's
were received by which processes.

Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>

 include/trace/events/skb.h |   20 ++++++++++++++++++++
 net/core/datagram.c        |    3 +++
 2 files changed, 23 insertions(+)
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1e5053b7

include/trace/events/skb.h

+20 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#define _TRACE_SKB_H



#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/tracepoint.h>



/*
@@ -34,6 +35,25 @@ TRACE_EVENT(kfree_skb, 
		__entry->skbaddr, __entry->protocol, __entry->location)

);



TRACE_EVENT(skb_copy_datagram_iovec,



	TP_PROTO(const struct sk_buff *skb, int len),



	TP_ARGS(skb, len),



	TP_STRUCT__entry(

		__field(	const void *,		skbaddr		)

		__field(	int,			len		)

	),



	TP_fast_assign(

		__entry->skbaddr = skb;

		__entry->len = len;

	),



	TP_printk("skbaddr=%p len=%d", __entry->skbaddr, __entry->len)

);



#endif /* _TRACE_SKB_H */



/* This part must be outside protection */

net/core/datagram.c

+3 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ 
#include <net/checksum.h>

#include <net/sock.h>

#include <net/tcp_states.h>

#include <trace/events/skb.h>



/*

 *	Is a socket 'connection oriented' ?
@@ -284,6 +285,8 @@ int skb_copy_datagram_iovec(const struct sk_buff *skb, int offset, 
	int i, copy = start - offset;

	struct sk_buff *frag_iter;



	trace_skb_copy_datagram_iovec(skb, len);



	/* Copy header. */

	if (copy > 0) {

		if (copy > len)