4 files changed, 78 insertions, 20 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index 0b0618edd645..1ab919f836a8 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -156,6 +156,14 @@ struct ehca_mod_qp_parm {
 
 #define EHCA_MOD_QP_PARM_MAX 4
 
+#define QMAP_IDX_MASK 0xFFFFULL
+
+/* struct for tracking if cqes have been reported to the application */
+struct ehca_qmap_entry {
+        u16 app_wr_id;
+        u16 reported;
+};
+
 struct ehca_qp {
         union {
                 struct ib_qp ib_qp;
@@ -165,6 +173,7 @@ struct ehca_qp {
         enum ehca_ext_qp_type ext_type;
         enum ib_qp_state state;
         struct ipz_queue ipz_squeue;
+        struct ehca_qmap_entry *sq_map;
         struct ipz_queue ipz_rqueue;
         struct h_galpas galpas;
         u32 qkey;
diff --git a/drivers/infiniband/hw/ehca/ehca_qes.h b/drivers/infiniband/hw/ehca/ehca_qes.h
index 818803057ebf..5d28e3e98a20 100644
--- a/drivers/infiniband/hw/ehca/ehca_qes.h
+++ b/drivers/infiniband/hw/ehca/ehca_qes.h
@@ -213,6 +213,7 @@ struct ehca_wqe {
 #define WC_STATUS_ERROR_BIT 0x80000000
 #define WC_STATUS_REMOTE_ERROR_FLAGS 0x0000F800
 #define WC_STATUS_PURGE_BIT 0x10
+#define WC_SEND_RECEIVE_BIT 0x80
 
 struct ehca_cqe {
         u64 work_request_id;
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index c58fd4eead18..b6bcee036734 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -412,6 +412,7 @@ static struct ehca_qp *internal_create_qp(
         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
                                               ib_device);
         struct ib_ucontext *context = NULL;
+        u32 nr_qes;
         u64 h_ret;
         int is_llqp = 0, has_srq = 0;
         int qp_type, max_send_sge, max_recv_sge, ret;
@@ -715,6 +716,15 @@ static struct ehca_qp *internal_create_qp(
                                  "and pages ret=%i", ret);
                         goto create_qp_exit2;
                 }
+                nr_qes = my_qp->ipz_squeue.queue_length /
+                         my_qp->ipz_squeue.qe_size;
+                my_qp->sq_map = vmalloc(nr_qes *
+                                        sizeof(struct ehca_qmap_entry));
+                if (!my_qp->sq_map) {
+                        ehca_err(pd->device, "Couldn't allocate squeue "
+                                 "map ret=%i", ret);
+                        goto create_qp_exit3;
+                }
         }
 
         if (HAS_RQ(my_qp)) {
@@ -724,7 +734,7 @@ static struct ehca_qp *internal_create_qp(
                 if (ret) {
                         ehca_err(pd->device, "Couldn't initialize rqueue "
                                  "and pages ret=%i", ret);
-                        goto create_qp_exit3;
+                        goto create_qp_exit4;
                 }
         }
 
@@ -770,7 +780,7 @@ static struct ehca_qp *internal_create_qp(
                         if (!my_qp->mod_qp_parm) {
                                 ehca_err(pd->device,
                                          "Could not alloc mod_qp_parm");
-                                goto create_qp_exit4;
+                                goto create_qp_exit5;
                         }
                 }
         }
@@ -780,7 +790,7 @@ static struct ehca_qp *internal_create_qp(
                 h_ret = ehca_define_sqp(shca, my_qp, init_attr);
                 if (h_ret != H_SUCCESS) {
                         ret = ehca2ib_return_code(h_ret);
-                        goto create_qp_exit5;
+                        goto create_qp_exit6;
                 }
         }
 
@@ -789,7 +799,7 @@ static struct ehca_qp *internal_create_qp(
                 if (ret) {
                         ehca_err(pd->device,
                                  "Couldn't assign qp to send_cq ret=%i", ret);
-                        goto create_qp_exit5;
+                        goto create_qp_exit6;
                 }
         }
 
@@ -815,22 +825,26 @@ static struct ehca_qp *internal_create_qp(
                 if (ib_copy_to_udata(udata, &resp, sizeof resp)) {
                         ehca_err(pd->device, "Copy to udata failed");
                         ret = -EINVAL;
-                        goto create_qp_exit6;
+                        goto create_qp_exit7;
                 }
         }
 
         return my_qp;
 
-create_qp_exit6:
+create_qp_exit7:
         ehca_cq_unassign_qp(my_qp->send_cq, my_qp->real_qp_num);
 
-create_qp_exit5:
+create_qp_exit6:
         kfree(my_qp->mod_qp_parm);
 
-create_qp_exit4:
+create_qp_exit5:
         if (HAS_RQ(my_qp))
                 ipz_queue_dtor(my_pd, &my_qp->ipz_rqueue);
 
+create_qp_exit4:
+        if (HAS_SQ(my_qp))
+                vfree(my_qp->sq_map);
+
 create_qp_exit3:
         if (HAS_SQ(my_qp))
                 ipz_queue_dtor(my_pd, &my_qp->ipz_squeue);
@@ -1979,8 +1993,10 @@ static int internal_destroy_qp(struct ib_device *dev, struct ehca_qp *my_qp,
 
         if (HAS_RQ(my_qp))
                 ipz_queue_dtor(my_pd, &my_qp->ipz_rqueue);
-        if (HAS_SQ(my_qp))
+        if (HAS_SQ(my_qp)) {
                 ipz_queue_dtor(my_pd, &my_qp->ipz_squeue);
+                vfree(my_qp->sq_map);
+        }
         kmem_cache_free(qp_cache, my_qp);
         atomic_dec(&shca->num_qps);
         return 0;
diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c
index cea3eba9c83e..4426d82fe798 100644
--- a/drivers/infiniband/hw/ehca/ehca_reqs.c
+++ b/drivers/infiniband/hw/ehca/ehca_reqs.c
@@ -139,6 +139,7 @@ static void trace_send_wr_ud(const struct ib_send_wr *send_wr)
 static inline int ehca_write_swqe(struct ehca_qp *qp,
                                   struct ehca_wqe *wqe_p,
                                   const struct ib_send_wr *send_wr,
+                                  u32 sq_map_idx,
                                   int hidden)
 {
         u32 idx;
@@ -157,7 +158,11 @@ static inline int ehca_write_swqe(struct ehca_qp *qp,
         /* clear wqe header until sglist */
         memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));
 
-        wqe_p->work_request_id = send_wr->wr_id;
+        wqe_p->work_request_id = send_wr->wr_id & ~QMAP_IDX_MASK;
+        wqe_p->work_request_id |= sq_map_idx & QMAP_IDX_MASK;
+
+        qp->sq_map[sq_map_idx].app_wr_id = send_wr->wr_id & QMAP_IDX_MASK;
+        qp->sq_map[sq_map_idx].reported = 0;
 
         switch (send_wr->opcode) {
         case IB_WR_SEND:
@@ -381,6 +386,7 @@ static inline int post_one_send(struct ehca_qp *my_qp,
 {
         struct ehca_wqe *wqe_p;
         int ret;
+        u32 sq_map_idx;
         u64 start_offset = my_qp->ipz_squeue.current_q_offset;
 
         /* get pointer next to free WQE */
@@ -393,8 +399,15 @@ static inline int post_one_send(struct ehca_qp *my_qp,
                          "qp_num=%x", my_qp->ib_qp.qp_num);
                 return -ENOMEM;
         }
+
+        /*
+         * Get the index of the WQE in the send queue. The same index is used
+         * for writing into the sq_map.
+         */
+        sq_map_idx = start_offset / my_qp->ipz_squeue.qe_size;
+
         /* write a SEND WQE into the QUEUE */
-        ret = ehca_write_swqe(my_qp, wqe_p, cur_send_wr, hidden);
+        ret = ehca_write_swqe(my_qp, wqe_p, cur_send_wr, sq_map_idx, hidden);
         /*
          * if something failed,
          * reset the free entry pointer to the start value
@@ -654,8 +667,34 @@ repoll:
                          my_cq, my_cq->cq_number);
         }
 
-        /* we got a completion! */
-        wc->wr_id = cqe->work_request_id;
+        read_lock(&ehca_qp_idr_lock);
+        my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
+        read_unlock(&ehca_qp_idr_lock);
+        if (!my_qp)
+                goto repoll;
+        wc->qp = &my_qp->ib_qp;
+
+        if (!(cqe->w_completion_flags & WC_SEND_RECEIVE_BIT)) {
+                struct ehca_qmap_entry *qmap_entry;
+                /*
+                 * We got a send completion and need to restore the original
+                 * wr_id.
+                 */
+                qmap_entry = &my_qp->sq_map[cqe->work_request_id &
+                                            QMAP_IDX_MASK];
+
+                if (qmap_entry->reported) {
+                        ehca_warn(cq->device, "Double cqe on qp_num=%#x",
+                                  my_qp->real_qp_num);
+                        /* found a double cqe, discard it and read next one */
+                        goto repoll;
+                }
+                wc->wr_id = cqe->work_request_id & ~QMAP_IDX_MASK;
+                wc->wr_id |= qmap_entry->app_wr_id;
+                qmap_entry->reported = 1;
+        } else
+                /* We got a receive completion. */
+                wc->wr_id = cqe->work_request_id;
 
         /* eval ib_wc_opcode */
         wc->opcode = ib_wc_opcode[cqe->optype]-1;
@@ -678,13 +717,6 @@ repoll:
         } else
                 wc->status = IB_WC_SUCCESS;
 
-        read_lock(&ehca_qp_idr_lock);
-        my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
-        read_unlock(&ehca_qp_idr_lock);
-        if (!my_qp)
-                goto repoll;
-        wc->qp = &my_qp->ib_qp;
-
         wc->byte_len = cqe->nr_bytes_transferred;
         wc->pkey_index = cqe->pkey_index;
         wc->slid = cqe->rlid;