IB/ehca: Support UD low-latency QPs

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 57 insertions, 27 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index 6f35f07dc02c..fa3e03050347 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -275,6 +275,11 @@ static inline void queue2resp(struct ipzu_queue_resp *resp,
         resp->toggle_state = queue->toggle_state;
 }
 
+static inline int ll_qp_msg_size(int nr_sge)
+{
+        return 128 << nr_sge;
+}
+
 /*
  * init_qp_queue initializes/constructs r/squeue and registers queue pages.
  */
@@ -363,8 +368,6 @@ struct ehca_qp *internal_create_qp(struct ib_pd *pd,
                                    struct ib_srq_init_attr *srq_init_attr,
                                    struct ib_udata *udata, int is_srq)
 {
-        static int da_rc_msg_size[] = { 128, 256, 512, 1024, 2048, 4096 };
-        static int da_ud_sq_msg_size[]={ 128, 384, 896, 1920, 3968 };
         struct ehca_qp *my_qp;
         struct ehca_pd *my_pd = container_of(pd, struct ehca_pd, ib_pd);
         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
@@ -396,6 +399,7 @@ struct ehca_qp *internal_create_qp(struct ib_pd *pd,
                 parms.ll_comp_flags = qp_type & LLQP_COMP_MASK;
         }
         qp_type &= 0x1F;
+        init_attr->qp_type &= 0x1F;
 
         /* handle SRQ base QPs */
         if (init_attr->srq) {
@@ -435,23 +439,49 @@ struct ehca_qp *internal_create_qp(struct ib_pd *pd,
                 return ERR_PTR(-EINVAL);
         }
 
-        if (is_llqp && (qp_type != IB_QPT_RC && qp_type != IB_QPT_UD)) {
-                ehca_err(pd->device, "unsupported LL QP Type=%x", qp_type);
-                return ERR_PTR(-EINVAL);
-        } else if (is_llqp && qp_type == IB_QPT_RC &&
-                   (init_attr->cap.max_send_wr > 255 ||
-                    init_attr->cap.max_recv_wr > 255 )) {
-                ehca_err(pd->device, "Invalid Number of max_sq_wr=%x "
-                         "or max_rq_wr=%x for RC LLQP",
-                         init_attr->cap.max_send_wr,
-                         init_attr->cap.max_recv_wr);
-                return ERR_PTR(-EINVAL);
-        } else if (is_llqp && qp_type == IB_QPT_UD &&
-                 init_attr->cap.max_send_wr > 255) {
-                ehca_err(pd->device,
-                         "Invalid Number of max_send_wr=%x for UD QP_TYPE=%x",
-                         init_attr->cap.max_send_wr, qp_type);
-                return ERR_PTR(-EINVAL);
+        if (is_llqp) {
+                switch (qp_type) {
+                case IB_QPT_RC:
+                        if ((init_attr->cap.max_send_wr > 255) ||
+                            (init_attr->cap.max_recv_wr > 255)) {
+                                ehca_err(pd->device,
+                                         "Invalid Number of max_sq_wr=%x "
+                                         "or max_rq_wr=%x for RC LLQP",
+                                         init_attr->cap.max_send_wr,
+                                         init_attr->cap.max_recv_wr);
+                                return ERR_PTR(-EINVAL);
+                        }
+                        break;
+                case IB_QPT_UD:
+                        if (!EHCA_BMASK_GET(HCA_CAP_UD_LL_QP, shca->hca_cap)) {
+                                ehca_err(pd->device, "UD LLQP not supported "
+                                         "by this adapter");
+                                return ERR_PTR(-ENOSYS);
+                        }
+                        if (!(init_attr->cap.max_send_sge <= 5
+                            && init_attr->cap.max_send_sge >= 1
+                            && init_attr->cap.max_recv_sge <= 5
+                            && init_attr->cap.max_recv_sge >= 1)) {
+                                ehca_err(pd->device,
+                                         "Invalid Number of max_send_sge=%x "
+                                         "or max_recv_sge=%x for UD LLQP",
+                                         init_attr->cap.max_send_sge,
+                                         init_attr->cap.max_recv_sge);
+                                return ERR_PTR(-EINVAL);
+                        } else if (init_attr->cap.max_send_wr > 255) {
+                                ehca_err(pd->device,
+                                         "Invalid Number of "
+                                         "ax_send_wr=%x for UD QP_TYPE=%x",
+                                         init_attr->cap.max_send_wr, qp_type);
+                                return ERR_PTR(-EINVAL);
+                        }
+                        break;
+                default:
+                        ehca_err(pd->device, "unsupported LL QP Type=%x",
+                                 qp_type);
+                        return ERR_PTR(-EINVAL);
+                        break;
+                }
         }
 
         if (pd->uobject && udata)
@@ -509,7 +539,7 @@ struct ehca_qp *internal_create_qp(struct ib_pd *pd,
         /* UD_AV CIRCUMVENTION */
         max_send_sge = init_attr->cap.max_send_sge;
         max_recv_sge = init_attr->cap.max_recv_sge;
-        if (parms.servicetype == ST_UD) {
+        if (parms.servicetype == ST_UD && !is_llqp) {
                 max_send_sge += 2;
                 max_recv_sge += 2;
         }
@@ -547,8 +577,8 @@ struct ehca_qp *internal_create_qp(struct ib_pd *pd,
                         rwqe_size = offsetof(struct ehca_wqe, u.nud.sg_list[
                                              (parms.act_nr_recv_sges)]);
                 } else { /* for LLQP we need to use msg size, not wqe size */
-                        swqe_size = da_rc_msg_size[max_send_sge];
-                        rwqe_size = da_rc_msg_size[max_recv_sge];
+                        swqe_size = ll_qp_msg_size(max_send_sge);
+                        rwqe_size = ll_qp_msg_size(max_recv_sge);
                         parms.act_nr_send_sges = 1;
                         parms.act_nr_recv_sges = 1;
                 }
@@ -563,15 +593,15 @@ struct ehca_qp *internal_create_qp(struct ib_pd *pd,
         case IB_QPT_UD:
         case IB_QPT_GSI:
         case IB_QPT_SMI:
-                /* UD circumvention */
-                parms.act_nr_recv_sges -= 2;
-                parms.act_nr_send_sges -= 2;
                 if (is_llqp) {
-                        swqe_size = da_ud_sq_msg_size[max_send_sge];
-                        rwqe_size = da_rc_msg_size[max_recv_sge];
+                        swqe_size = ll_qp_msg_size(parms.act_nr_send_sges);
+                        rwqe_size = ll_qp_msg_size(parms.act_nr_recv_sges);
                         parms.act_nr_send_sges = 1;
                         parms.act_nr_recv_sges = 1;
                 } else {
+                        /* UD circumvention */
+                        parms.act_nr_send_sges -= 2;
+                        parms.act_nr_recv_sges -= 2;
                         swqe_size = offsetof(struct ehca_wqe,
                                              u.ud_av.sg_list[parms.act_nr_send_sges]);
                         rwqe_size = offsetof(struct ehca_wqe,