[ofa-general] [PATCH RFC] RDMA/cxgb3: Add protocol statistics to iw_cxgb3.

[Roland Dreier]

> - Add a new rdma ctl command called RDMA_GET_MIB to the low level driver
> to obtain the protocol mib from the hardware.
>
> - Add a sysfs entry to allow dumping these stats.

This looks really useful for debugging/tuning etc... what MIBs are being dumped
here?  The standard TCP and IPv4 MIBs?

Looking at this it seems that maybe we want to add this to the core so
all iWARP devices can (optionally) expose this in a common way -- I
would assume that sane
iWARP hardware gives a way to get offload engine stats.

So maybe a new ib_device or iw_cm method -- i don't know the right name but
something like struct ib_device.get_iw_stats struct iw_cm_verbs.get_stats?
And then add something similar to the perf counter stuff we have in sysfs.c for
IB devices?

Then userspace tools can count on stuff being exposed in the same way rather
than being vendor dependent.

 - R.