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Date: Tue, 18 Aug 2020 20:54:51 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Jacob Keller <jacob.e.keller@...el.com> Cc: netdev@...r.kernel.org Subject: Re: [net-next v3 3/4] devlink: introduce flash update overwrite mask On Tue, 18 Aug 2020 17:28:17 -0700 Jacob Keller wrote: > +The ``devlink-flash`` command allows optionally specifying a mask indicating > +the how the device should handle subsections of flash components when remove one 'the'? > +updating. This mask indicates the set of sections which are allowed to be > +overwritten. > diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c > index ebfc4a698809..74a869fbaa67 100644 > --- a/drivers/net/netdevsim/dev.c > +++ b/drivers/net/netdevsim/dev.c > @@ -201,6 +201,8 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev) > return PTR_ERR(nsim_dev->ports_ddir); > debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir, > &nsim_dev->fw_update_status); > + debugfs_create_u32("fw_update_overwrite_mask", 0600, nsim_dev->ddir, > + &nsim_dev->fw_update_overwrite_mask); Nice to see the test, but netdevsim changes could be separated out :S > debugfs_create_u32("max_macs", 0600, nsim_dev->ddir, > &nsim_dev->max_macs); > debugfs_create_bool("test1", 0600, nsim_dev->ddir, > -#define DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT BIT(0) > +#define DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT BIT(0) > +#define DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK BIT(1) Since core will check supported flags, I'd be tempted to have a flag for each override type. Saves an 'if' in every driver. > struct devlink_region; > struct devlink_info_req; > diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h > index cfef4245ea5a..1d8bbe9c1ae1 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, IMHO generally a good practice to have 0 be undefined. > + __DEVLINK_FLASH_OVERWRITE_MAX_BIT, > + DEVLINK_FLASH_OVERWRITE_MAX_BIT = __DEVLINK_FLASH_OVERWRITE_MAX_BIT - 1 > +};
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