[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: 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 1992effe3f8b067a3e11154fc570bfa97d20252a..2d3b1815c04e431095af6fe05ce120f0e3785a3c 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -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);