[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>

diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index 6bed9a3..c62e7cf 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/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 =