On Fri, Mar 27, 2015 at 01:16:31PM -0400, ira.weiny wrote:

On Fri, Mar 27, 2015 at 10:13:19AM -0600, Jason Gunthorpe wrote:

quoted

On Fri, Mar 27, 2015 at 04:47:36PM +0100, Michael Wang wrote:

quoted

Introduce helper has_iwarp() to help us check if an IB device
support IWARP protocol.

Should probably be !has_rdma_read_sges()

True if the device can handle more than one SGE entry on a RDMA READ
work request.

Isn't this value already provided by the query_device verb?

The verbs spec states the Query HCA contains the:

"Maximum number of scatter/gather entries per Work Request supported by the
HCA."

http://www.spinics.net/lists/linux-rdma/msg22565.html

''Unlike IB, the iWARP protocol only allows 1 target/sink SGE in an
rdma read''

It is one of those annoying verbs is different on iWarp things.

So the max sge in the query_verbs must only apply to send/rdma write
on iWarp?

Jason