Hi Sean,
I've just starting looking into IB connection establishment and I was
wondering what the ib_cm_init_qp_attr() function actually does. Studying
the MindShare IB book, it talks about exchanging the QPNs, pSNs etc.,
via the REQ and REP messages. However, looking at your cmpost.c example,
I see, for exmaple, that in the req handler the event containing the REQ
message is never actually used when modyfing the QP to RTR. The
ib_cm_init_qp_attr() function is used instead. Does the info in the REQ
message get read in kernel space?
May you could expand a bit on the description of ib_cm_init_qp_attr()
function.
Thanks a lot.
Steve.
Sean Hefty wrote:
The following patch:
* Adds user specified context to all uCM events. Users will not retrieve
any events associated with the context after destroying the corresponding
cm_id.
* Provides the ib_cm_init_qp_attr() call to userspace clients of the CM.
This call may be used to set QP attributes properly before modifying
the QP.
* Fixes some error handling synchronization and cleanup issues.
* Performs some minor code cleanup.
* Replaces the ucm_simple test program with a userspace version of cmpost.
The userspace version of cmpost uses the uAT interface to retrieve path
records based on a remote host name, establishes a connection over a QP,
and performs some simple message passing between the nodes.
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