netdev - [PATCH RFC net-next 07/19] devlink: Add health diagnose command

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Date:   Mon, 31 Dec 2018 16:32:01 +0200
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>, Aya Levin <ayal@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Tal Alon <talal@...lanox.com>,
        Ariel Almog <ariela@...lanox.com>
Subject: [PATCH RFC net-next 07/19] devlink: Add health diagnose command

Add devlink health diagnose command, in order to run a diagnose
operation over a specific reporter.

It is expected from driver's callback for diagnose command to fill it via the
buffer descriptors API. Devlink will parse it and convert isto netlink nla API
in order to pass it to the user.

Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
---
 include/uapi/linux/devlink.h |  1 +
 net/core/devlink.c           | 51 ++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 243819560715..73faabe37488 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -92,6 +92,7 @@ enum devlink_command {
 	DEVLINK_CMD_HEALTH_REPORTER_GET,
 	DEVLINK_CMD_HEALTH_REPORTER_SET,
 	DEVLINK_CMD_HEALTH_REPORTER_RECOVER,
+	DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE,
 
 	/* add new commands above here */
 	__DEVLINK_CMD_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 31fff86390e3..343ebbd38ba8 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4484,6 +4484,50 @@ static int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
 	return devlink_health_reporter_recover(reporter, NULL);
 }
 
+static int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
+							struct genl_info *info)
+{
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_health_reporter *reporter;
+	u64 num_of_buffers;
+	int err;
+
+	reporter = devlink_health_reporter_get_from_info(devlink, info);
+	if (!reporter)
+		return -EINVAL;
+
+	if (!reporter->ops->diagnose)
+		return -EOPNOTSUPP;
+
+	num_of_buffers =
+		DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->diagnose_size);
+
+	mutex_lock(&reporter->diagnose_lock);
+	devlink_health_buffers_reset(reporter->diagnose_buffers_array,
+				     num_of_buffers);
+
+	err = reporter->ops->diagnose(reporter,
+				      reporter->diagnose_buffers_array,
+				      DEVLINK_HEALTH_BUFFER_SIZE,
+				      num_of_buffers);
+	if (err)
+		goto out;
+
+	err = devlink_health_buffer_snd(info,
+					DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE,
+					0, reporter->diagnose_buffers_array,
+					num_of_buffers);
+	if (err)
+		goto out;
+
+	mutex_unlock(&reporter->diagnose_lock);
+	return 0;
+
+out:
+	mutex_unlock(&reporter->diagnose_lock);
+	return err;
+}
+
 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 },
@@ -4754,6 +4798,13 @@ static const struct genl_ops devlink_nl_ops[] = {
 		.flags = GENL_ADMIN_PERM,
 		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK,
 	},
+	{
+		.cmd = DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE,
+		.doit = devlink_nl_cmd_health_reporter_diagnose_doit,
+		.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 = {
-- 
2.17.1