Add support for modifying CQ parameters for controlling
event generation moderation. This allows to control the
rate of event (interrupt) generation by specifying a minimum
number of CQEs or a minimum period of time required to
generate an event.
Signed-off-by: Eli Cohen <[EMAIL PROTECTED]>
---
Index: ofa_1_3_dev_kernel/include/rdma/ib_verbs.h
===================================================================
--- ofa_1_3_dev_kernel.orig/include/rdma/ib_verbs.h 2007-09-24
12:33:41.000000000 +0200
+++ ofa_1_3_dev_kernel/include/rdma/ib_verbs.h 2007-09-24 13:07:59.000000000
+0200
@@ -967,6 +967,8 @@ 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);
@@ -1372,6 +1374,16 @@ struct ib_cq *ib_create_cq(struct ib_dev
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 tirgger an event
+ * @cq_period: max period of time beofre triggering an event
+ *
+ * Users can examine the cq structure to determine the actual CQ size.
+ */
+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.
*/
Index: ofa_1_3_dev_kernel/drivers/infiniband/core/verbs.c
===================================================================
--- ofa_1_3_dev_kernel.orig/drivers/infiniband/core/verbs.c 2007-09-24
11:19:03.000000000 +0200
+++ ofa_1_3_dev_kernel/drivers/infiniband/core/verbs.c 2007-09-24
13:07:59.000000000 +0200
@@ -628,6 +628,13 @@ struct ib_cq *ib_create_cq(struct ib_dev
}
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))
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