IB/core: Add support for modify CQ

Add support for modifying CQ parameters for controlling event
generation moderation.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 8ffb5f2c21f7..05042089de6e 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -630,6 +630,13 @@ struct ib_cq *ib_create_cq(struct ib_device *device,
 }
 EXPORT_SYMBOL(ib_create_cq);
 
+int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
+{
+        return cq->device->modify_cq ?
+                cq->device->modify_cq(cq, cq_count, cq_period) : -ENOSYS;
+}
+EXPORT_SYMBOL(ib_modify_cq);
+
 int ib_destroy_cq(struct ib_cq *cq)
 {
         if (atomic_read(&cq->usecnt))
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index c48f6af5ef9a..95bf4bac44cb 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -987,6 +987,8 @@ struct ib_device {
                                                 int comp_vector,
                                                 struct ib_ucontext *context,
                                                 struct ib_udata *udata);
+        int                        (*modify_cq)(struct ib_cq *cq, u16 cq_count,
+                                                u16 cq_period);
         int                        (*destroy_cq)(struct ib_cq *cq);
         int                        (*resize_cq)(struct ib_cq *cq, int cqe,
                                                 struct ib_udata *udata);
@@ -1392,6 +1394,15 @@ struct ib_cq *ib_create_cq(struct ib_device *device,
 int ib_resize_cq(struct ib_cq *cq, int cqe);
 
 /**
+ * ib_modify_cq - Modifies moderation params of the CQ
+ * @cq: The CQ to modify.
+ * @cq_count: number of CQEs that will trigger an event
+ * @cq_period: max period of time in usec before triggering an event
+ *
+ */
+int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period);
+
+/**
  * ib_destroy_cq - Destroys the specified CQ.
  * @cq: The CQ to destroy.
  */