Re: [PATCH net-next v3 2/7] devlink: Add new "io_eq_size" generic device param

Jiri Pirko
2021-12-09T09:21:55Z

Wed, Dec 08, 2021 at 03:17:17PM CET, shayd@nvidia.com wrote:
>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>
>---
> 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 b7dfe693a332..cd9342305a13 100644
>--- 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``
>+ - u16

You missed this.

>+ - Control the size of I/O completion EQs.
>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index 3276a29f2b81..b5f4acd0e0cd 100644
>--- 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 db3b52110cf2..0d4e63d11585 100644
>--- 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)
>--
>2.21.3
>