devlink: Add new "io_eq_size" generic device param

Add new device generic parameter to determine the size of the
I/O completion EQs.

For example, to reduce I/O EQ size to 64, execute:
$ devlink dev param set pci/0000:06:00.0 \
              name io_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>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
index b7dfe69..547c0b4 100644 (file)
--- a/Documentation/networking/devlink/devlink-params.rst
+++ b/Documentation/networking/devlink/devlink-params.rst
@@ -129,3 +129,6 @@ own name.
        will NACK any attempt of other host to reset the device. This parameter
        is useful for setups where a device is shared by different hosts, such
        as multi-host setup.
+   * - ``io_eq_size``
+     - u32
+     - Control the size of I/O completion EQs.

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 3276a29..b5f4acd 100644 (file)
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -459,6 +459,7 @@ enum devlink_param_generic_id {
        DEVLINK_PARAM_GENERIC_ID_ENABLE_RDMA,
        DEVLINK_PARAM_GENERIC_ID_ENABLE_VNET,
        DEVLINK_PARAM_GENERIC_ID_ENABLE_IWARP,
+       DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
 
        /* add new param generic ids above here*/
        __DEVLINK_PARAM_GENERIC_ID_MAX,
@@ -511,6 +512,9 @@ enum devlink_param_generic_id {
 #define DEVLINK_PARAM_GENERIC_ENABLE_IWARP_NAME "enable_iwarp"
 #define DEVLINK_PARAM_GENERIC_ENABLE_IWARP_TYPE DEVLINK_PARAM_TYPE_BOOL
 
+#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(_id, _cmodes, _get, _set, _validate)     \
 {                                                                      \
        .id = DEVLINK_PARAM_GENERIC_ID_##_id,                           \

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 0a9349a..e2e38b8 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4466,6 +4466,11 @@ static const struct devlink_param devlink_param_generic[] = {
                .name = DEVLINK_PARAM_GENERIC_ENABLE_IWARP_NAME,
                .type = DEVLINK_PARAM_GENERIC_ENABLE_IWARP_TYPE,
        },
+       {
+               .id = DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
+               .name = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_NAME,
+               .type = DEVLINK_PARAM_GENERIC_IO_EQ_SIZE_TYPE,
+       },
 };
 
 static int devlink_param_generic_verify(const struct devlink_param *param)