[PATCH net-next v3 4/7] devlink: Add new "event_eq_size" generic device param

Shay Drory
2021-12-08T14:18:01Z

Add new device generic parameter to determine the size of the
asynchronous control events EQ.

For example, to reduce event EQ size to 64, execute:
$ devlink dev param set pci/0000:06:00.0 \
name event_eq_size value 64 cmode driverinit
$ devlink dev reload pci/0000:06:00.0

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
---
Documentation/networking/devlink/devlink-params.rst | 3 +++
include/net/devlink.h | 4 ++++
net/core/devlink.c | 5 +++++
3 files changed, 12 insertions(+)

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index cd9342305a13..0eddee6e66f3 100644
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -132,3 +132,6 @@ own name.
* - ``io_eq_size``
- u16
- Control the size of I/O completion EQs.
+ * - ``event_eq_size``
+ - u16
+ - Control the size of asynchronous control events EQ.
diff --git a/include/net/devlink.h b/include/net/devlink.h
index b5f4acd0e0cd..8d5349d2fb68 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -460,6 +460,7 @@ enum devlink_param_generic_id {
DEVLINK_PARAM_GENERIC_ID_ENABLE_VNET,
DEVLINK_PARAM_GENERIC_ID_ENABLE_IWARP,
DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
+ DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,

/* add new param generic ids above here*/
__DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -515,6 +516,9 @@ enum devlink_param_generic_id {
#define DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_NAME "io_eq_size"
#define DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_TYPE DEVLINK_PARAM_TYPE_U32

+#define DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_NAME "event_eq_size"
+#define DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_TYPE DEVLINK_PARAM_TYPE_U32
+
#define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate) \
{ \
.id = DEVLINK_PARAM_GENERIC_ID_##_id, \
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 0d4e63d11585..d9f3c994e704 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4471,6 +4471,11 @@ static const struct devlink_param devlink_param_generic[] = {
.name = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_NAME,
.type = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_TYPE,
},
+ {
+ .id = DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,
+ .name = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_NAME,
+ .type = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_TYPE,
+ },
};

static int devlink_param_generic_verify(const struct devlink_param *param)
--
2.21.3