netdev - Re: [net-next v4 3/5] devlink: introduce flash update overwrite mask

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Date:   Thu, 10 Sep 2020 14:01:57 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [net-next v4 3/5] devlink: introduce flash update overwrite mask



On 9/9/2020 6:03 PM, Jakub Kicinski wrote:
> On Wed,  9 Sep 2020 15:26:51 -0700 Jacob Keller wrote:
>> diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
>> index 40d35145c879..19a573566359 100644
>> --- a/include/uapi/linux/devlink.h
>> +++ b/include/uapi/linux/devlink.h
>> @@ -228,6 +228,28 @@ enum {
>>  	DEVLINK_ATTR_STATS_MAX = __DEVLINK_ATTR_STATS_MAX - 1
>>  };
>>  
>> +/* Specify what sections of a flash component can be overwritten when
>> + * performing an update. Overwriting of firmware binary sections is always
>> + * implicitly assumed to be allowed.
>> + *
>> + * Each section must be documented in
>> + * Documentation/networking/devlink/devlink-flash.rst
>> + *
>> + */
>> +enum {
>> +	DEVLINK_FLASH_OVERWRITE_SETTINGS_BIT,
>> +	DEVLINK_FLASH_OVERWRITE_IDENTIFIERS_BIT,
>> +
>> +	__DEVLINK_FLASH_OVERWRITE_MAX_BIT,
>> +	DEVLINK_FLASH_OVERWRITE_MAX_BIT = __DEVLINK_FLASH_OVERWRITE_MAX_BIT - 1
>> +};
>> +
>> +#define DEVLINK_FLASH_OVERWRITE_SETTINGS BIT(DEVLINK_FLASH_OVERWRITE_SETTINGS_BIT)
>> +#define DEVLINK_FLASH_OVERWRITE_IDENTIFIERS BIT(DEVLINK_FLASH_OVERWRITE_IDENTIFIERS_BIT)
>> +
>> +#define DEVLINK_SUPPORTED_FLASH_OVERWRITE_SECTIONS \
>> +	(BIT(__DEVLINK_FLASH_OVERWRITE_MAX_BIT) - 1)
> 
> I don't think you can use BIT() in uAPI headers :(
> 


Hmmm.. There are exactly 2 other uses I found by searching for 'BIT('
that already exists. We can chance this to just do the bit shift directly.

>>  /**
>>   * enum devlink_trap_action - Packet trap action.
>>   * @DEVLINK_TRAP_ACTION_DROP: Packet is dropped by the device and a copy is not
>> @@ -460,6 +482,9 @@ enum devlink_attr {
>>  
>>  	DEVLINK_ATTR_PORT_EXTERNAL,		/* u8 */
>>  	DEVLINK_ATTR_PORT_CONTROLLER_NUMBER,	/* u32 */
>> +
>> +	DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK,	/* bitfield32 */
>> +
>>  	/* add new attributes above here, update the policy in devlink.c */
>>  
>>  	__DEVLINK_ATTR_MAX,
>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>> index c61f9c8205f6..d0d38ca17ea8 100644
>> --- a/net/core/devlink.c
>> +++ b/net/core/devlink.c
>> @@ -3125,8 +3125,8 @@ static int devlink_nl_cmd_flash_update(struct sk_buff *skb,
>>  				       struct genl_info *info)
>>  {
>>  	struct devlink_flash_update_params params = {};
>> +	struct nlattr *nla_component, *nla_overwrite;
>>  	struct devlink *devlink = info->user_ptr[0];
>> -	struct nlattr *nla_component;
>>  	u32 supported_params;
>>  
>>  	if (!devlink->ops->flash_update)
>> @@ -3149,6 +3149,19 @@ static int devlink_nl_cmd_flash_update(struct sk_buff *skb,
>>  		params.component = nla_data(nla_component);
>>  	}
>>  
>> +	nla_overwrite = info->attrs[DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK];
>> +	if (nla_overwrite) {
>> +		struct nla_bitfield32 sections;
>> +
>> +		if (!(supported_params & DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK)) {
>> +			NL_SET_ERR_MSG_ATTR(info->extack, nla_overwrite,
>> +					    "overwrite is not supported");
> 
> settings ... by this device ?

Sure I can fix this along with the other location either as a follow up
or a respin if this still needs it.

Thanks,
Jake

> 
>> +			return -EOPNOTSUPP;
>> +		}
>> +		sections = nla_get_bitfield32(nla_overwrite);
>> +		params.overwrite_mask = sections.value & sections.selector;
>  
>