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    Subject[PATCH][13/27] IB/mthca: implement RDMA/atomic operations for mem-free mode
    Date
    From
    Add code to support RDMA and atomic send work requests in mem-free mode.

    Signed-off-by: Roland Dreier <roland@topspin.com>


    --- linux-export.orig/drivers/infiniband/hw/mthca/mthca_qp.c 2005-04-01 12:38:21.580276194 -0800
    +++ linux-export/drivers/infiniband/hw/mthca/mthca_qp.c 2005-04-01 12:38:25.023528759 -0800
    @@ -1775,6 +1775,53 @@
    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);
    -
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