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Commit 76726ccb authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
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devlink: add flash update command 



Add devlink flash update command. Advanced NICs have firmware
stored in flash and often cryptographically secured. Updating
that flash is handled by management firmware. Ethtool has a
flash update command which served us well, however, it has two
shortcomings:
 - it takes rtnl_lock unnecessarily - really flash update has
   nothing to do with networking, so using a networking device
   as a handle is suboptimal, which leads us to the second one:
 - it requires a functioning netdev - in case device enters an
   error state and can't spawn a netdev (e.g. communication
   with the device fails) there is no netdev to use as a handle
   for flashing.

Devlink already has the ability to report the firmware versions,
now with the ability to update the firmware/flash we will be
able to recover devices in bad state.

To enable updates of sub-components of the FW allow passing
component name.  This name should correspond to one of the
versions reported in devlink info.

v1: - replace target id with component name (Jiri).

Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8e31c474

include/net/devlink.h

+3 −0
Original line number Diff line number Diff line
@@ -521,6 +521,9 @@ struct devlink_ops { 
				      struct netlink_ext_ack *extack);

	int (*info_get)(struct devlink *devlink, struct devlink_info_req *req,

			struct netlink_ext_ack *extack);

	int (*flash_update)(struct devlink *devlink, const char *file_name,

			    const char *component,

			    struct netlink_ext_ack *extack);

};



static inline void *devlink_priv(struct devlink *devlink)

include/uapi/linux/devlink.h

+6 −0
Original line number Diff line number Diff line
@@ -103,6 +103,8 @@ enum devlink_command { 
	DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET,

	DEVLINK_CMD_HEALTH_REPORTER_DUMP_CLEAR,



	DEVLINK_CMD_FLASH_UPDATE,



	/* add new commands above here */

	__DEVLINK_CMD_MAX,

	DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@@ -326,6 +328,10 @@ enum devlink_attr { 
	DEVLINK_ATTR_HEALTH_REPORTER_DUMP_TS,		/* u64 */

	DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD,	/* u64 */

	DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER,	/* u8 */



	DEVLINK_ATTR_FLASH_UPDATE_FILE_NAME,	/* string */

	DEVLINK_ATTR_FLASH_UPDATE_COMPONENT,	/* string */



	/* add new attributes above here, update the policy in devlink.c */



	__DEVLINK_ATTR_MAX,

net/core/devlink.c

+30 −0
Original line number Diff line number Diff line
@@ -2662,6 +2662,27 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info) 
	return devlink->ops->reload(devlink, info->extack);

}



static int devlink_nl_cmd_flash_update(struct sk_buff *skb,

				       struct genl_info *info)

{

	struct devlink *devlink = info->user_ptr[0];

	const char *file_name, *component;

	struct nlattr *nla_component;



	if (!devlink->ops->flash_update)

		return -EOPNOTSUPP;



	if (!info->attrs[DEVLINK_ATTR_FLASH_UPDATE_FILE_NAME])

		return -EINVAL;

	file_name = nla_data(info->attrs[DEVLINK_ATTR_FLASH_UPDATE_FILE_NAME]);



	nla_component = info->attrs[DEVLINK_ATTR_FLASH_UPDATE_COMPONENT];

	component = nla_component ? nla_data(nla_component) : NULL;



	return devlink->ops->flash_update(devlink, file_name, component,

					  info->extack);

}



static const struct devlink_param devlink_param_generic[] = {

	{

		.id = DEVLINK_PARAM_GENERIC_ID_INT_ERR_RESET,
@@ -4883,6 +4904,8 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = { 
	[DEVLINK_ATTR_HEALTH_REPORTER_NAME] = { .type = NLA_NUL_STRING },

	[DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD] = { .type = NLA_U64 },

	[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER] = { .type = NLA_U8 },

	[DEVLINK_ATTR_FLASH_UPDATE_FILE_NAME] = { .type = NLA_NUL_STRING },

	[DEVLINK_ATTR_FLASH_UPDATE_COMPONENT] = { .type = NLA_NUL_STRING },

};



static const struct genl_ops devlink_nl_ops[] = {
@@ -5171,6 +5194,13 @@ static const struct genl_ops devlink_nl_ops[] = { 
		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |

				  DEVLINK_NL_FLAG_NO_LOCK,

	},

	{

		.cmd = DEVLINK_CMD_FLASH_UPDATE,

		.doit = devlink_nl_cmd_flash_update,

		.policy = devlink_nl_policy,

		.flags = GENL_ADMIN_PERM,

		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,

	},

};



static struct genl_family devlink_nl_family __ro_after_init = {