Sean, if QPs and CQs are created via librdmacm ala winverbs... assuming
that the associated doorbells
and mailboxes created for these objects are mapped into user mode - can
these objects (doorbells) also be directly accessed from kernel mode ?
Sean Hefty wrote:
Basically QP and CQ can be obtained in kernel mode winverbs driver using
WvQpAcquire(..) and WvCqAcquire() respectively.
These two calls lookup a handle given some integer ID. The QP and CQ must have
already been created. They provide validation of the user space identifiers and
protect against destruction while the underlying handles are in use.
Winverbs doesn't really provide a clean interface for kernel clients. I would
like to see a kernel interface, but it really doesn't exist at the moment. It
shouldn't take that much to provide one for the verbs (non-CM calls).
And post_send and poll_cq done using HCA verbs interface calls QP->pVerbs-
post_send() and QP->pVerbs->poll_cq().
I think any kernel interface should be at most inline wrappers around these
direct HCA calls, so I agree that kernel clients should be able to use them
directly.
- Sean
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