[ofa-general] [PATCH RFCv2 1/2] RDMA: Add protocol statisticsattributes to the RDMA sysfs.

[Chien Tung]

> how do you handle stats if I change routing so an offloaded 
> connection goes from physical port 1 to physical port 2?

Depends on what you mean by changing the route.  We can switch a
connection 
between physical ports within our chip.  In that case the stats stays
with the netdev.  

> Or presumably you have support for port aggregation in hardware 
> so an offloaded connection can use both physical ports at the 
> same time?

We do support port aggregation in our silicon.  However, a connection is
bound to 
a physical port but switchable (see above).

> Actually it seems that you attach a struct ib_device to each 
> netdev (eg a two-port NIC gets two RDMA devices with iw_nes) 
> so Steve's scheme should work fine for you too?  (I just 
> looked on a system with a two-port NIC and I do see nes0 and 
> nes1 devices)

After some discussion with our architect, Steve's scheme will work for
us by 
limiting to one netdev per physical port.  I will look into implementing
the 
same scheme.  Thank you (Steve + Roland) for driving this.

Chien