Commit 2d8dc5bb authored by Arkadi Sharshevsky's avatar Arkadi Sharshevsky Committed by David S. Miller
Browse files

devlink: Add support for reload 



Add support for performing driver hot reload.

Signed-off-by: default avatarArkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d9f9b9a4

include/net/devlink.h

+1 −0
Original line number Diff line number Diff line
@@ -281,6 +281,7 @@ struct devlink_resource { 
#define DEVLINK_RESOURCE_ID_PARENT_TOP 0



struct devlink_ops {

	int (*reload)(struct devlink *devlink);

	int (*port_type_set)(struct devlink_port *devlink_port,

			     enum devlink_port_type port_type);

	int (*port_split)(struct devlink *devlink, unsigned int port_index,

include/uapi/linux/devlink.h

+5 −0
Original line number Diff line number Diff line
@@ -73,6 +73,11 @@ enum devlink_command { 
	DEVLINK_CMD_RESOURCE_SET,

	DEVLINK_CMD_RESOURCE_DUMP,



	/* Hot driver reload, makes configuration changes take place. The

	 * devlink instance is not released during the process.

	 */

	DEVLINK_CMD_RELOAD,



	/* add new commands above here */

	__DEVLINK_CMD_MAX,

	DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1

net/core/devlink.c

+47 −0
Original line number Diff line number Diff line
@@ -2515,6 +2515,45 @@ static int devlink_nl_cmd_resource_dump(struct sk_buff *skb, 
	return devlink_resource_fill(info, DEVLINK_CMD_RESOURCE_DUMP, 0);

}



static int

devlink_resources_validate(struct devlink *devlink,

			   struct devlink_resource *resource,

			   struct genl_info *info)

{

	struct list_head *resource_list;

	int err = 0;



	if (resource)

		resource_list = &resource->resource_list;

	else

		resource_list = &devlink->resource_list;



	list_for_each_entry(resource, resource_list, list) {

		if (!resource->size_valid)

			return -EINVAL;

		err = devlink_resources_validate(devlink, resource, info);

		if (err)

			return err;

	}

	return err;

}



static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)

{

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

	int err;



	if (!devlink->ops->reload)

		return -EOPNOTSUPP;



	err = devlink_resources_validate(devlink, NULL, info);

	if (err) {

		NL_SET_ERR_MSG_MOD(info->extack, "resources size validation failed");

		return err;

	}

	return devlink->ops->reload(devlink);

}



static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {

	[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING },

	[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING },
@@ -2709,6 +2748,14 @@ static const struct genl_ops devlink_nl_ops[] = { 
		.flags = GENL_ADMIN_PERM,

		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,

	},

	{

		.cmd = DEVLINK_CMD_RELOAD,

		.doit = devlink_nl_cmd_reload,

		.policy = devlink_nl_policy,

		.flags = GENL_ADMIN_PERM,

		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK |

				  DEVLINK_NL_FLAG_NO_LOCK,

	},

};



static struct genl_family devlink_nl_family __ro_after_init = {