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Commit ff253fed authored by Eran Ben Elisha's avatar Eran Ben Elisha Committed by David S. Miller
Browse files

devlink: Add health get command 



Add devlink health get command to provide reporter/s data for user space.
Add the ability to get data per reporter or dump data from all available
reporters.

Signed-off-by: default avatarEran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: default avatarMoshe Shemesh <moshe@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7af343b

include/uapi/linux/devlink.h

+12 −0
Original line number Diff line number Diff line
@@ -89,6 +89,8 @@ enum devlink_command { 
	DEVLINK_CMD_REGION_DEL,

	DEVLINK_CMD_REGION_READ,



	DEVLINK_CMD_HEALTH_REPORTER_GET,



	/* add new commands above here */

	__DEVLINK_CMD_MAX,

	DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@@ -293,6 +295,16 @@ enum devlink_attr { 
	DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_TYPE,	/* u8 */

	DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_DATA,	/* dynamic */



	DEVLINK_ATTR_HEALTH_REPORTER,			/* nested */

	DEVLINK_ATTR_HEALTH_REPORTER_NAME,		/* string */

	DEVLINK_ATTR_HEALTH_REPORTER_STATE,		/* u8 */

	DEVLINK_ATTR_HEALTH_REPORTER_ERR,		/* u64 */

	DEVLINK_ATTR_HEALTH_REPORTER_RECOVER,		/* u64 */

	DEVLINK_ATTR_HEALTH_REPORTER_DUMP_AVAIL,	/* u8 */

	DEVLINK_ATTR_HEALTH_REPORTER_DUMP_TS,		/* u64 */

	DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD,	/* u64 */

	DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER,	/* u8 */



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



	__DEVLINK_ATTR_MAX,

net/core/devlink.c

+152 −0
Original line number Diff line number Diff line
@@ -4317,6 +4317,149 @@ int devlink_health_report(struct devlink_health_reporter *reporter, 
}

EXPORT_SYMBOL_GPL(devlink_health_report);



static struct devlink_health_reporter *

devlink_health_reporter_get_from_info(struct devlink *devlink,

				      struct genl_info *info)

{

	char *reporter_name;



	if (!info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME])

		return NULL;



	reporter_name =

		nla_data(info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME]);

	return devlink_health_reporter_find_by_name(devlink, reporter_name);

}



static int

devlink_nl_health_reporter_fill(struct sk_buff *msg,

				struct devlink *devlink,

				struct devlink_health_reporter *reporter,

				enum devlink_command cmd, u32 portid,

				u32 seq, int flags)

{

	struct nlattr *reporter_attr;

	void *hdr;



	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);

	if (!hdr)

		return -EMSGSIZE;



	if (devlink_nl_put_handle(msg, devlink))

		goto genlmsg_cancel;



	reporter_attr = nla_nest_start(msg, DEVLINK_ATTR_HEALTH_REPORTER);

	if (!reporter_attr)

		goto genlmsg_cancel;

	if (nla_put_string(msg, DEVLINK_ATTR_HEALTH_REPORTER_NAME,

			   reporter->ops->name))

		goto reporter_nest_cancel;

	if (nla_put_u8(msg, DEVLINK_ATTR_HEALTH_REPORTER_STATE,

		       reporter->health_state))

		goto reporter_nest_cancel;

	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_HEALTH_REPORTER_ERR,

			      reporter->error_count, DEVLINK_ATTR_PAD))

		goto reporter_nest_cancel;

	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_HEALTH_REPORTER_RECOVER,

			      reporter->recovery_count, DEVLINK_ATTR_PAD))

		goto reporter_nest_cancel;

	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD,

			      reporter->graceful_period,

			      DEVLINK_ATTR_PAD))

		goto reporter_nest_cancel;

	if (nla_put_u8(msg, DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER,

		       reporter->auto_recover))

		goto reporter_nest_cancel;

	if (nla_put_u8(msg, DEVLINK_ATTR_HEALTH_REPORTER_DUMP_AVAIL,

		       reporter->dump_avail))

		goto reporter_nest_cancel;

	if (reporter->dump_avail &&

	    nla_put_u64_64bit(msg, DEVLINK_ATTR_HEALTH_REPORTER_DUMP_TS,

			      jiffies_to_msecs(reporter->dump_ts),

			      DEVLINK_ATTR_PAD))

		goto reporter_nest_cancel;



	nla_nest_end(msg, reporter_attr);

	genlmsg_end(msg, hdr);

	return 0;



reporter_nest_cancel:

	nla_nest_end(msg, reporter_attr);

genlmsg_cancel:

	genlmsg_cancel(msg, hdr);

	return -EMSGSIZE;

}



static int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb,

						   struct genl_info *info)

{

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

	struct devlink_health_reporter *reporter;

	struct sk_buff *msg;

	int err;



	reporter = devlink_health_reporter_get_from_info(devlink, info);

	if (!reporter)

		return -EINVAL;



	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);

	if (!msg)

		return -ENOMEM;



	err = devlink_nl_health_reporter_fill(msg, devlink, reporter,

					      DEVLINK_CMD_HEALTH_REPORTER_GET,

					      info->snd_portid, info->snd_seq,

					      0);

	if (err) {

		nlmsg_free(msg);

		return err;

	}



	return genlmsg_reply(msg, info);

}



static int

devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,

					  struct netlink_callback *cb)

{

	struct devlink_health_reporter *reporter;

	struct devlink *devlink;

	int start = cb->args[0];

	int idx = 0;

	int err;



	mutex_lock(&devlink_mutex);

	list_for_each_entry(devlink, &devlink_list, list) {

		if (!net_eq(devlink_net(devlink), sock_net(msg->sk)))

			continue;

		mutex_lock(&devlink->lock);

		list_for_each_entry(reporter, &devlink->reporter_list,

				    list) {

			if (idx < start) {

				idx++;

				continue;

			}

			err = devlink_nl_health_reporter_fill(msg, devlink,

							      reporter,

							      DEVLINK_CMD_HEALTH_REPORTER_GET,

							      NETLINK_CB(cb->skb).portid,

							      cb->nlh->nlmsg_seq,

							      NLM_F_MULTI);

			if (err) {

				mutex_unlock(&devlink->lock);

				goto out;

			}

			idx++;

		}

		mutex_unlock(&devlink->lock);

	}

out:

	mutex_unlock(&devlink_mutex);



	cb->args[0] = idx;

	return msg->len;

}



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 },
@@ -4342,6 +4485,7 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = { 
	[DEVLINK_ATTR_PARAM_VALUE_CMODE] = { .type = NLA_U8 },

	[DEVLINK_ATTR_REGION_NAME] = { .type = NLA_NUL_STRING },

	[DEVLINK_ATTR_REGION_SNAPSHOT_ID] = { .type = NLA_U32 },

	[DEVLINK_ATTR_HEALTH_REPORTER_NAME] = { .type = NLA_NUL_STRING },

};



static const struct genl_ops devlink_nl_ops[] = {
@@ -4562,6 +4706,14 @@ static const struct genl_ops devlink_nl_ops[] = { 
		.flags = GENL_ADMIN_PERM,

		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,

	},

	{

		.cmd = DEVLINK_CMD_HEALTH_REPORTER_GET,

		.doit = devlink_nl_cmd_health_reporter_get_doit,

		.dumpit = devlink_nl_cmd_health_reporter_get_dumpit,

		.policy = devlink_nl_policy,

		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,

		/* can be retrieved by unprivileged users */

	},

};



static struct genl_family devlink_nl_family __ro_after_init = {