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Commit ddb934e0 authored by Roland Dreier's avatar Roland Dreier Committed by Linus Torvalds
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[PATCH] IB/mthca: implement RDMA/atomic operations for mem-free mode 



Add code to support RDMA and atomic send work requests in mem-free mode.

Signed-off-by: default avatarRoland Dreier <roland@topspin.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b87dcfba

drivers/infiniband/hw/mthca/mthca_qp.c

+47 −0
Original line number Diff line number Diff line
@@ -1775,6 +1775,53 @@ int mthca_arbel_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, 
		size = sizeof (struct mthca_next_seg) / 16;



		switch (qp->transport) {

		case RC:

			switch (wr->opcode) {

			case IB_WR_ATOMIC_CMP_AND_SWP:

			case IB_WR_ATOMIC_FETCH_AND_ADD:

				((struct mthca_raddr_seg *) wqe)->raddr =

					cpu_to_be64(wr->wr.atomic.remote_addr);

				((struct mthca_raddr_seg *) wqe)->rkey =

					cpu_to_be32(wr->wr.atomic.rkey);

				((struct mthca_raddr_seg *) wqe)->reserved = 0;



				wqe += sizeof (struct mthca_raddr_seg);



				if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {

					((struct mthca_atomic_seg *) wqe)->swap_add =

						cpu_to_be64(wr->wr.atomic.swap);

					((struct mthca_atomic_seg *) wqe)->compare =

						cpu_to_be64(wr->wr.atomic.compare_add);

				} else {

					((struct mthca_atomic_seg *) wqe)->swap_add =

						cpu_to_be64(wr->wr.atomic.compare_add);

					((struct mthca_atomic_seg *) wqe)->compare = 0;

				}



				wqe += sizeof (struct mthca_atomic_seg);

				size += sizeof (struct mthca_raddr_seg) / 16 +

					sizeof (struct mthca_atomic_seg);

				break;



			case IB_WR_RDMA_WRITE:

			case IB_WR_RDMA_WRITE_WITH_IMM:

			case IB_WR_RDMA_READ:

				((struct mthca_raddr_seg *) wqe)->raddr =

					cpu_to_be64(wr->wr.rdma.remote_addr);

				((struct mthca_raddr_seg *) wqe)->rkey =

					cpu_to_be32(wr->wr.rdma.rkey);

				((struct mthca_raddr_seg *) wqe)->reserved = 0;

				wqe += sizeof (struct mthca_raddr_seg);

				size += sizeof (struct mthca_raddr_seg) / 16;

				break;



			default:

				/* No extra segments required for sends */

				break;

			}



			break;



		case UD:

			memcpy(((struct mthca_arbel_ud_seg *) wqe)->av,

			       to_mah(wr->wr.ud.ah)->av, MTHCA_AV_SIZE);