Re: [PATCH net-next 0/6] add a set of tracepoints to tcp stack

[David Miller]

From: Song Liu 
Date: Fri, 20 Oct 2017 14:20:40 -0700

> These patches add the following tracepoints to tcp stack.
> 
> tcp_send_reset
> tcp_receive_reset
> tcp_destroy_sock
> tcp_set_state

Please fix this build error, it probably happens when IPV6 is built
modular:

ERROR: "__tracepoint_tcp_send_reset" [net/ipv6/ipv6.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed

Thanks.

Re: [PATCH net-next 0/6] add a set of tracepoints to tcp stack

[Song Liu]

CCing key audience of these patches. 

I am really sorry if I have spammed your inbox multiple times with 
the same set of patches. I have been struggling to get git-send-email
sending email to netdev. The only solution I found is to be reduce CC 
list.

Best Regards,
Song


> On Oct 20, 2017, at 2:20 PM, Song Liu  wrote:
> 
> Resending the patch set as there were something wrong with my email
> server.
> 
> These patches add the following tracepoints to tcp stack.
> 
> tcp_send_reset
> tcp_receive_reset
> tcp_destroy_sock
> tcp_set_state
> 
> These tracepoints can be used to track TCP state changes. Such state
> changes include but are not limited to: connection establish,
> connection termination, tx and rx of RST, various retransmits.
> 
> Currently, we use the following kprobes to trace these events:
> 
> int kprobe__tcp_validate_incoming
> int kprobe__tcp_send_active_reset
> int kprobe__tcp_v4_send_reset
> int kprobe__tcp_v6_send_reset
> int kprobe__tcp_v4_destroy_sock
> int kprobe__tcp_set_state
> int kprobe__tcp_retransmit_skb
> 
> These tracepoints will help us simplify this work.
> 
> Thanks,
> Song
> 
> Song Liu (6):
>  tcp: add trace event class tcp_event_sk_skb
>  tcp: mark trace event arguments sk and skb as const
>  tcp: add tracepoint trace_tcp_send_reset
>  tcp: add tracepoint trace_tcp_receive_reset
>  tcp: add tracepoint trace_tcp_destroy_sock
>  tcp: add tracepoint trace_tcp_set_state()
> 
> include/trace/events/tcp.h | 181 -
> net/ipv4/tcp.c |   4 +
> net/ipv4/tcp_input.c   |   3 +
> net/ipv4/tcp_ipv4.c|   8 +-
> net/ipv4/tcp_output.c  |   5 ++
> net/ipv6/tcp_ipv6.c|  10 ++-
> 6 files changed, 204 insertions(+), 7 deletions(-)
> 
> --
> 2.9.5