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

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Message-ID: <1d1f00e2-6c71-9a60-e83d-4b1e521c82fc@amd.com>
Date:   Tue, 6 Dec 2022 10:18:00 -0800
From:   Shannon Nelson <shannon.nelson@....com>
To:     Jiri Pirko <jiri@...nulli.us>
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

On 12/6/22 1:07 AM, Jiri Pirko wrote:
> 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.

I suspect it will depend upon the actual device that uses this.  In our 
case, all future resets until changed again by this or by a devlink dev 
flash command.  I'll tweak the wording a bit to something like
     "... to be loaded from on future device boot/resets."

> 
> 
>> 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
>>