This introduces tracepoint for smc fallback to TCP, so that we can track
which connection and why it fallbacks, and map the clcsocks' pointer with
/proc/net/tcp to find more details about TCP connections. Compared with
kprobe or other dynamic tracing, tracepoints are stable and easy to use.
Signed-off-by: NTony Lu <tonylu@linux.alibaba.com>
Reviewed-by: NWen Gu <guwen@linux.alibaba.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>