[ofa-general] Re: [PATCH v2] rdma_cm: Add debugfs entries to monitor rdma_cm connections

[Or Gerlitz]

Moni Shoua wrote:
> Create a virtual file under debugfs for each cma device and use it to print
> information about each rdma_id that is attached to this device.

If you create virtual file for each device, where are you going to print
listener IDs which aren't bind to any specific device?

> Here is an example of 'cat /sys/kernel/debug/rdma_cm/mthca0_rdma_id'
> TYPE DEVICE  PORT NET_DEV SRC_ADDR                                            DST_ADDR                                            SPACE STATE          QP_NUM
>      mthca0  0            0.0.0.0:7174                                                                                            TCP   LISTEN         0    
> IB   mthca0  1    ib0     192.30.3.249:46079                                  192.30.3.248:7174                                   TCP   CONNECT        132102
> IB   mthca0  1    ib0     192.30.3.249:7174                                   192.30.3.248:42561                                  TCP   CONNECT        132103

First, if by definition this file relates to device mthca0, why printing mthca0 in the output? 
second, if a listener is binded to mthca0 then its src address can't be 0.0.0.0 - correct?

I'd like to see how we come up with a solution with somehow less space-ing between columns, 
maybe take a look at the netperf code, e.g that generates output as below. 

Applying something like the -p option of netperf would be cool, for that 
end you can have the rmda_cm keep track of rdma_create_id caller's current->pid 

> # netstat -natup
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
> tcp        0      0 127.0.0.1:2208              0.0.0.0:*                   LISTEN      5979/hpiod
> tcp        0      0 0.0.0.0:802                 0.0.0.0:*                   LISTEN      5708/rpc.statd
> tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      5667/portmap
> tcp        0      0 0.0.0.0:58385               0.0.0.0:*                   LISTEN      -
> tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      6020/cupsd
> tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      6045/sendmail: acce
> tcp        0      0 127.0.0.1:2207              0.0.0.0:*                   LISTEN      5984/python
> tcp        0      0 172.30.49.1:47609           172.30.49.2:1000            ESTABLISHED 18567/qperf
> tcp        0      0 172.30.49.1:58935           172.30.49.2:22              ESTABLISHED 18123/ssh
> tcp        0      0 :::1003                     :::*                        LISTEN      18562/qperf
> tcp        0      0 :::22                       :::*                        LISTEN      6004/sshd
> tcp        0      0 ::ffff:172.30.49.1:22       ::ffff:172.25.5.138:60437   ESTABLISHED 17734/0
> tcp        0      0 ::ffff:172.30.49.1:1003     ::ffff:172.30.49.3:45282    ESTABLISHED 18563/qperf
> tcp        0      0 ::ffff:10.10.5.157:22       ::ffff:10.10.0.90:58802     ESTABLISHED 18226/2
> tcp        0      0 ::ffff:172.30.49.1:22       ::ffff:172.25.5.138:56035   ESTABLISHED 11932/1