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

[Song Liu <songliubraving@fb.com>]

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(-)