[ofa-general] fast path operation?
rdreier at cisco.com
Tue Jan 22 15:23:23 PST 2008
> I got another question about your code for mthca HCA. In the
> "mthca_provider.c", the functions "mthca_create_cq(struct ib_device
> *ibdev, int entries, struct ib_ucontext *context, struct ib_udata *udata)"
> and "mthca_alloc_pd(struct ib_device *ibdev, struct ib_ucontext *context,
> struct ib_udata *udata)" all have a parameter "ib_ucontext*", while in the
> "Verbs.c", the calling functions "ib_create_cq" and "ib_alloc_pd" all pass
> "NULL" to this parameter, is the " ib_ucontext *" only needed for fast
> path operation, in which situation the user application can write directly
> to user space? If it's true, how to set up the fast path operation in the
> driver environment?
Yes, the struct ib_ucontext is used for objects that are created and
accessed in userspace. The parameter will be non-NULL for commands
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