[openib-general] openIB gen2 user space verbs API

[Or Gerlitz]

Christoph> Roland, reading the userspace infiniband/verbs.h file, where
did query QP go?

Roland>It's not implemented yet.  Is there an application that needs it?

Roland,

Other than getting the max inline size, query qp is used to get the
current QP state, examples are 
app error flow (eg when modify qp failed) and app APM flow to sense some
of the state transitions
done by the HW. These are only examples I quickly thought of, I guess
there are more. 

I understand and like the atitude of striving for simplicity but I guess
that for production mthca and the 
uverbs library would need to support all the query functions existing in
VAPI (see below, maybe to the exception
of query ah / eec / mw).

Indeed, it can be that some of them (eg the first four below) can be
implemented in mthca only and their
result cached/mmaped to be used by the uverbs libs. 

Or.

[root at zeta ogerlitz]# grep query /usr/mellanox/include/vapi.h | grep
Func | awk '{ print $3}'
VAPI_query_hca_cap
VAPI_query_hca_port_prop
VAPI_query_hca_gid_tbl
VAPI_query_hca_pkey_tbl
VAPI_query_addr_hndl
VAPI_query_qp
VAPI_query_qp_ext
VAPI_query_srq
VAPI_query_cq
VAPI_query_eec_attr
VAPI_query_mr
VAPI_query_mw

-----Original Message-----
From: openib-general-bounces at openib.org
[mailto:openib-general-bounces at openib.org] On Behalf Of Roland Dreier
Sent: Saturday, April 16, 2005 1:08 AM
To: Sayantan Sur
Cc: Christoph Raisch; openib-general at openib.org
Subject: Re: [openib-general] openIB gen2 user space verbs API

    Sayantan> In VAPI, the query QP is used to find the inline size.

    Sayantan> Is there another way to find out the inline size in Gen2
    Sayantan> verbs?

It's not implemented yet, but I would have ibv_create_qp():

struct ibv_qp *ibv_create_qp(struct ibv_pd *pd,
			     struct ibv_qp_init_attr *qp_init_attr);

to pass the max inline size back in the
qp_init_attr->qp_cap.max_inline_data
member.

I'll code this up on Monday, it's pretty trivial.

 - R.
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