IB: remove xrc_remote_srq_num from struct ib_send_wr

The field is only initialized in mlx, but never used.

If we want to add proper XRC support it should be done with a new
struct ib_xrc_wr.

This shrinks the various WR structures by another 4 bytes.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: NJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: NHaggai Eran <haggaie@mellanox.com>

drivers/infiniband/hw/mlx5/qp.c

@@ -2627,7 +2627,6 @@ int mlx5_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 		switch (ibqp->qp_type) {
 		case IB_QPT_XRC_INI:
 			xrc = seg;
-			xrc->xrc_srqn = htonl(wr->xrc_remote_srq_num);
 			seg += sizeof(*xrc);
 			size += sizeof(*xrc) / 16;
 			/* fall through */

include/rdma/ib_verbs.h

@@ -1100,7 +1100,6 @@ struct ib_send_wr {
 		__be32		imm_data;
 		u32		invalidate_rkey;
 	} ex;
-	u32			xrc_remote_srq_num;	/* XRC TGT QPs only */
 };
 
 struct ib_rdma_wr {