netdev - Re: [PATCH net-next 1/2] devlink: add fw bank select parameter

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Date:   Tue, 6 Dec 2022 10:07:19 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Shannon Nelson <shannon.nelson@....com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jiri@...dia.com
Subject: Re: [PATCH net-next 1/2] devlink: add fw bank select parameter

Mon, Dec 05, 2022 at 06:26:26PM CET, shannon.nelson@....com wrote:
>Some devices have multiple memory banks that can be used to
>hold various firmware versions that can be chosen for booting.
>This can be used in addition to or along with the FW_LOAD_POLICY
>parameter, depending on the capabilities of the particular
>device.
>
>This is a parameter suggested by Jake in
>https://lore.kernel.org/netdev/CO1PR11MB508942BE965E63893DE9B86AD6129@CO1PR11MB5089.namprd11.prod.outlook.com/
>
>Signed-off-by: Shannon Nelson <shannon.nelson@....com>
>---
> Documentation/networking/devlink/devlink-params.rst | 4 ++++
> include/net/devlink.h                               | 4 ++++
> net/core/devlink.c                                  | 5 +++++
> 3 files changed, 13 insertions(+)
>
>diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst
>index 4e01dc32bc08..ed62c8a92f17 100644
>--- a/Documentation/networking/devlink/devlink-params.rst
>+++ b/Documentation/networking/devlink/devlink-params.rst
>@@ -137,3 +137,7 @@ own name.
>    * - ``event_eq_size``
>      - u32
>      - Control the size of asynchronous control events EQ.
>+   * - ``fw_bank``
>+     - u8
>+     - In a multi-bank flash device, select the FW memory bank to be
>+       loaded from on the next device boot/reset.

Just the next one or any in the future? Please define this precisely.


>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index 074a79b8933f..8a1430196980 100644
>--- a/include/net/devlink.h
>+++ b/include/net/devlink.h
>@@ -510,6 +510,7 @@ enum devlink_param_generic_id {
> 	DEVLINK_PARAM_GENERIC_ID_ENABLE_IWARP,
> 	DEVLINK_PARAM_GENERIC_ID_IO_EQ_SIZE,
> 	DEVLINK_PARAM_GENERIC_ID_EVENT_EQ_SIZE,
>+	DEVLINK_PARAM_GENERIC_ID_FW_BANK,
> 
> 	/* add new param generic ids above here*/
> 	__DEVLINK_PARAM_GENERIC_ID_MAX,
>@@ -568,6 +569,9 @@ enum devlink_param_generic_id {
> #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_FW_BANK_NAME "fw_bank"
>+#define DEVLINK_PARAM_GENERIC_FW_BANK_TYPE DEVLINK_PARAM_TYPE_U8
>+
> #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 0e10a8a68c5e..6872d678be5b 100644
>--- a/net/core/devlink.c
>+++ b/net/core/devlink.c
>@@ -5231,6 +5231,11 @@ static const struct devlink_param devlink_param_generic[] = {
> 		.name = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_NAME,
> 		.type = DEVLINK_PARAM_GENERIC_EVENT_EQ_SIZE_TYPE,
> 	},
>+	{
>+		.id = DEVLINK_PARAM_GENERIC_ID_FW_BANK,
>+		.name = DEVLINK_PARAM_GENERIC_FW_BANK_NAME,
>+		.type = DEVLINK_PARAM_GENERIC_FW_BANK_TYPE,
>+	},
> };
> 
> static int devlink_param_generic_verify(const struct devlink_param *param)
>-- 
>2.17.1
>