devlink: convert reporters dump to devlink_nl_instance_iter_dump()

Benefit from recently introduced instance iteration and convert
reporters .dumpit generic netlink callback to use it.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/devlink/devl_internal.h

@@ -164,6 +164,7 @@ extern const struct devlink_gen_cmd devl_gen_selftests;
 extern const struct devlink_gen_cmd devl_gen_param;
 extern const struct devlink_gen_cmd devl_gen_region;
 extern const struct devlink_gen_cmd devl_gen_info;
+extern const struct devlink_gen_cmd devl_gen_health_reporter;
 extern const struct devlink_gen_cmd devl_gen_trap;
 extern const struct devlink_gen_cmd devl_gen_trap_group;
 extern const struct devlink_gen_cmd devl_gen_trap_policer;

net/devlink/leftover.c

@@ -7768,70 +7768,59 @@ static int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb,
 }
 
 static int
-devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
+devlink_nl_cmd_health_reporter_get_dump_one(struct sk_buff *msg,
+					    struct devlink *devlink,
 					    struct netlink_callback *cb)
 {
 	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
-	struct devlink *devlink;
-	int err;
-
-	devlink_dump_for_each_instance_get(msg, state, devlink) {
 	struct devlink_health_reporter *reporter;
 	struct devlink_port *port;
 	unsigned long port_index;
 	int idx = 0;
+	int err;
 
-		devl_lock(devlink);
-		if (!devl_is_registered(devlink))
-			goto next_devlink;
-
-		list_for_each_entry(reporter, &devlink->reporter_list,
-				    list) {
+	list_for_each_entry(reporter, &devlink->reporter_list, list) {
 		if (idx < state->idx) {
 			idx++;
 			continue;
 		}
-			err = devlink_nl_health_reporter_fill(
-				msg, reporter, DEVLINK_CMD_HEALTH_REPORTER_GET,
-				NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+		err = devlink_nl_health_reporter_fill(msg, reporter,
+						      DEVLINK_CMD_HEALTH_REPORTER_GET,
+						      NETLINK_CB(cb->skb).portid,
+						      cb->nlh->nlmsg_seq,
 						      NLM_F_MULTI);
 		if (err) {
-				devl_unlock(devlink);
-				devlink_put(devlink);
 			state->idx = idx;
-				goto out;
+			return err;
 		}
 		idx++;
 	}
-
 	xa_for_each(&devlink->ports, port_index, port) {
 		list_for_each_entry(reporter, &port->reporter_list, list) {
 			if (idx < state->idx) {
 				idx++;
 				continue;
 			}
-				err = devlink_nl_health_reporter_fill(
-					msg, reporter,
+			err = devlink_nl_health_reporter_fill(msg, reporter,
 							      DEVLINK_CMD_HEALTH_REPORTER_GET,
 							      NETLINK_CB(cb->skb).portid,
-					cb->nlh->nlmsg_seq, NLM_F_MULTI);
+							      cb->nlh->nlmsg_seq,
+							      NLM_F_MULTI);
 			if (err) {
-					devl_unlock(devlink);
-					devlink_put(devlink);
 				state->idx = idx;
-					goto out;
+				return err;
 			}
 			idx++;
 		}
 	}
-next_devlink:
-		devl_unlock(devlink);
-		devlink_put(devlink);
-	}
-out:
-	return msg->len;
+
+	return 0;
 }
 
+const struct devlink_gen_cmd devl_gen_health_reporter = {
+	.dump_one		= devlink_nl_cmd_health_reporter_get_dump_one,
+};
+
 static int
 devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
 					struct genl_info *info)
@@ -9193,7 +9182,7 @@ const struct genl_small_ops devlink_nl_ops[56] = {
 		.cmd = DEVLINK_CMD_HEALTH_REPORTER_GET,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 		.doit = devlink_nl_cmd_health_reporter_get_doit,
-		.dumpit = devlink_nl_cmd_health_reporter_get_dumpit,
+		.dumpit = devlink_nl_instance_iter_dump,
 		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT,
 		/* can be retrieved by unprivileged users */
 	},

net/devlink/netlink.c

@@ -187,6 +187,7 @@ static const struct devlink_gen_cmd *devl_gen_cmds[] = {
 	[DEVLINK_CMD_PARAM_GET]		= &devl_gen_param,
 	[DEVLINK_CMD_REGION_GET]	= &devl_gen_region,
 	[DEVLINK_CMD_INFO_GET]		= &devl_gen_info,
+	[DEVLINK_CMD_HEALTH_REPORTER_GET] = &devl_gen_health_reporter,
 	[DEVLINK_CMD_RATE_GET]		= &devl_gen_rate_get,
 	[DEVLINK_CMD_TRAP_GET]		= &devl_gen_trap,
 	[DEVLINK_CMD_TRAP_GROUP_GET]	= &devl_gen_trap_group,