[ofa-general] [PATCH/RFC] Add support for "send with invalidate" to libibverbs

[Roland Dreier]

 > @@ -525,6 +537,9 @@ struct ibv_send_wr {
 >  			uint32_t	remote_qpn;
 >  			uint32_t	remote_qkey;
 >  		} ud;
 > +		struct {
 > +			uint32_t	rkey;
 > +		} invalidate;
 >  	} wr;
 >  };

Thinking about this a bit further... this doesn't work for iWARP "RDMA
read with invalidate" work requests, since this is inside a union, so
the invalidate rkey and the RDMA read remote_addr fields stomp on each
other.

And since we have to figure out how to marshall this into the kernel,
that is a bit of a problem.

Does anyone see a problem with putting the invalidate rkey inside the
rdma part of the wr union as a new field?  That is,

@@ -513,6 +525,7 @@ struct ibv_send_wr {
 		struct {
 			uint64_t	remote_addr;
 			uint32_t	rkey;
+			uint32_t	invalidate_rkey;
 		} rdma;

and similar on the kernel side?  (And there is no invalidate member of
this union added)

 - R.