[PATCH] IB/mthca: Enable unreliable connected transport

Add support for unreliable connected (UC) transport to mthca driver:
 - Add attributes for UC to modify QP table.
 - Add support for posting UC work requests.
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/infiniband/hw/mthca/mthca_qp.c

@@ -357,6 +357,9 @@ static const struct {
 				[UD]  = (IB_QP_PKEY_INDEX |
 					 IB_QP_PORT       |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_PKEY_INDEX |
+					 IB_QP_PORT       |
+					 IB_QP_ACCESS_FLAGS),
 				[RC]  = (IB_QP_PKEY_INDEX |
 					 IB_QP_PORT       |
 					 IB_QP_ACCESS_FLAGS),
@@ -378,6 +381,9 @@ static const struct {
 				[UD]  = (IB_QP_PKEY_INDEX |
 					 IB_QP_PORT       |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_PKEY_INDEX |
+					 IB_QP_PORT       |
+					 IB_QP_ACCESS_FLAGS),
 				[RC]  = (IB_QP_PKEY_INDEX |
 					 IB_QP_PORT       |
 					 IB_QP_ACCESS_FLAGS),
@@ -388,6 +394,11 @@ static const struct {
 		[IB_QPS_RTR]   = {
 			.trans = MTHCA_TRANS_INIT2RTR,
 			.req_param = {
+				[UC]  = (IB_QP_AV                  |
+					 IB_QP_PATH_MTU            |
+					 IB_QP_DEST_QPN            |
+					 IB_QP_RQ_PSN              |
+					 IB_QP_MAX_DEST_RD_ATOMIC),
 				[RC]  = (IB_QP_AV                  |
 					 IB_QP_PATH_MTU            |
 					 IB_QP_DEST_QPN            |
@@ -398,6 +409,9 @@ static const struct {
 			.opt_param = {
 				[UD]  = (IB_QP_PKEY_INDEX |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_ALT_PATH     |
+					 IB_QP_ACCESS_FLAGS |
+					 IB_QP_PKEY_INDEX),
 				[RC]  = (IB_QP_ALT_PATH     |
 					 IB_QP_ACCESS_FLAGS |
 					 IB_QP_PKEY_INDEX),
@@ -413,6 +427,8 @@ static const struct {
 			.trans = MTHCA_TRANS_RTR2RTS,
 			.req_param = {
 				[UD]  = IB_QP_SQ_PSN,
+				[UC]  = (IB_QP_SQ_PSN            |
+					 IB_QP_MAX_QP_RD_ATOMIC),
 				[RC]  = (IB_QP_TIMEOUT           |
 					 IB_QP_RETRY_CNT         |
 					 IB_QP_RNR_RETRY         |
@@ -423,6 +439,11 @@ static const struct {
 			.opt_param = {
 				[UD]  = (IB_QP_CUR_STATE             |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_CUR_STATE             |
+					 IB_QP_ALT_PATH              |
+					 IB_QP_ACCESS_FLAGS          |
+					 IB_QP_PKEY_INDEX            |
+					 IB_QP_PATH_MIG_STATE),
 				[RC]  = (IB_QP_CUR_STATE             |
 					 IB_QP_ALT_PATH              |
 					 IB_QP_ACCESS_FLAGS          |
@@ -442,6 +463,9 @@ static const struct {
 			.opt_param = {
 				[UD]  = (IB_QP_CUR_STATE             |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_ACCESS_FLAGS          |
+					 IB_QP_ALT_PATH              |
+					 IB_QP_PATH_MIG_STATE),
 				[RC]  = (IB_QP_ACCESS_FLAGS          |
 					 IB_QP_ALT_PATH              |
 					 IB_QP_PATH_MIG_STATE        |
@@ -462,6 +486,10 @@ static const struct {
 			.opt_param = {
 				[UD]  = (IB_QP_CUR_STATE             |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_CUR_STATE             |
+					 IB_QP_ALT_PATH              |
+					 IB_QP_ACCESS_FLAGS          |
+					 IB_QP_PATH_MIG_STATE),
 				[RC]  = (IB_QP_CUR_STATE             |
 					 IB_QP_ALT_PATH              |
 					 IB_QP_ACCESS_FLAGS          |
@@ -476,6 +504,14 @@ static const struct {
 			.opt_param = {
 				[UD]  = (IB_QP_PKEY_INDEX            |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_AV                    |
+					 IB_QP_MAX_QP_RD_ATOMIC      |
+					 IB_QP_MAX_DEST_RD_ATOMIC    |
+					 IB_QP_CUR_STATE             |
+					 IB_QP_ALT_PATH              |
+					 IB_QP_ACCESS_FLAGS          |
+					 IB_QP_PKEY_INDEX            |
+					 IB_QP_PATH_MIG_STATE),
 				[RC]  = (IB_QP_AV                    |
 					 IB_QP_TIMEOUT               |
 					 IB_QP_RETRY_CNT             |
@@ -501,6 +537,7 @@ static const struct {
 			.opt_param = {
 				[UD]  = (IB_QP_CUR_STATE             |
 					 IB_QP_QKEY),
+				[UC]  = (IB_QP_CUR_STATE),
 				[RC]  = (IB_QP_CUR_STATE             |
 					 IB_QP_MIN_RNR_TIMER),
 				[MLX] = (IB_QP_CUR_STATE             |
@@ -1530,6 +1567,26 @@ int mthca_tavor_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 
 			break;
 
+		case UC:
+			switch (wr->opcode) {
+			case IB_WR_RDMA_WRITE:
+			case IB_WR_RDMA_WRITE_WITH_IMM:
+				((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:
 			((struct mthca_tavor_ud_seg *) wqe)->lkey =
 				cpu_to_be32(to_mah(wr->wr.ud.ah)->key);
@@ -1815,9 +1872,29 @@ int mthca_arbel_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 					sizeof (struct mthca_atomic_seg);
 				break;
 
+			case IB_WR_RDMA_READ:
+			case IB_WR_RDMA_WRITE:
+			case IB_WR_RDMA_WRITE_WITH_IMM:
+				((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 UC:
+			switch (wr->opcode) {
 			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 =