[openib-general] wr_id in solicited receive requests

Fri Oct 22 14:11:21 PDT 2004

On Fri, 2004-10-22 at 16:55, Roland Dreier wrote:
> By the way, why is the cast (struct ib_mad_send_wc*)wc in the call to
> ib_mad_complete_send_wr() valid?  It looks like ib_mad_completion_handler()
> calls ib_mad_send_done_handler() with the address of a struct ib_wc on
> the stack; the layouts of struct ib_mad_send_wc and struct ib_wc don't
> match so I'm a little confused as to what that cast is trying to do.

It's an optimization since the ib_mad_send_wc structure is a subset of
and can be overlaid on the ib_wc structure. The ib_mad_send_wc struct is
the first 3 elements of the ib_wc structure.

-- Hal