[PATCH net-next v1 1/3] devlink: introduce framework for selftests

[Vikas Gupta]

Add a framework for running selftests.
Framework exposes devlink commands and test suite(s) to the user
to execute and query the supported tests by the driver.

To execute tests, users can provide a test mask for executing
group tests or standalone tests. API devlink_selftest_result_put() helps
drivers to populate the test results along with their names.

To query supported tests by device, API devlink_selftest_name_put()
helps a driver to populate test names.

Signed-off-by: Vikas Gupta <vikas.gupta@xxxxxxxxxxxx>
Reviewed-by: Michael Chan <michael.chan@xxxxxxxxxxxx>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>
---
 .../networking/devlink/devlink-selftests.rst  |  39 +++++
 include/net/devlink.h                         |  40 +++++
 include/uapi/linux/devlink.h                  |  24 +++
 net/core/devlink.c                            | 147 ++++++++++++++++++
 4 files changed, 250 insertions(+)
 create mode 100644 Documentation/networking/devlink/devlink-selftests.rst

diff --git a/Documentation/networking/devlink/devlink-selftests.rst b/Documentation/networking/devlink/devlink-selftests.rst
new file mode 100644
index 000000000000..df7c8fcac9bf
--- /dev/null
+++ b/Documentation/networking/devlink/devlink-selftests.rst
@@ -0,0 +1,39 @@
+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+.. _devlink_selftests:
+
+=================
+Devlink Selftests
+=================
+
+The ``devlink-selftests`` API allows executing selftests on the device.
+
+Tests Mask
+==========
+The ``devlink-selftests`` command should be run with a mask indicating
+the tests to be executed.
+
+Tests Description
+=================
+The following is a list of tests that drivers may execute.
+
+.. list-table:: List of tests
+   :widths: 5 90
+
+   * - Name
+     - Description
+   * - ``DEVLINK_SELFTEST_FLASH``
+     - Runs a flash test on the device which helps to log the health of the flash.
+       see Documentation/networking/devlink/devlink-health.rst
+
+example usage
+-------------
+
+.. code:: shell
+
+    # Query selftests supported on the device
+    $ devlink dev selftests show DEV
+    # Executes selftests on the device
+    $ devlink dev selftests run DEV test {flash | all}
+
+
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 2a2a2a0c93f7..493dab368340 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1215,6 +1215,19 @@ enum {
 	DEVLINK_F_RELOAD = 1UL << 0,
 };
 
+/**
+ * struct devlink_selftest_exec_info - Devlink selftest execution info.
+ * @name: Test name.
+ * @result: Test result.
+ */
+struct devlink_selftest_exec_info {
+	const char *name;
+	bool result;
+};
+
+#define DEVLINK_SELFTEST_FLASH_TEST_NAME \
+	"flash test"
+
 struct devlink_ops {
 	/**
 	 * @supported_flash_update_params:
@@ -1509,6 +1522,28 @@ struct devlink_ops {
 				    struct devlink_rate *parent,
 				    void *priv_child, void *priv_parent,
 				    struct netlink_ext_ack *extack);
+	/**
+	 * selftests_show() - Shows selftests supported by device
+	 * @devlink: Devlink instance
+	 * @skb: message payload
+	 * @extack: extack for reporting error messages
+	 *
+	 * Return: 0 on success, negative value otherwise.
+	 */
+
+	int (*selftests_show)(struct devlink *devlink, struct sk_buff *skb,
+			      struct netlink_ext_ack *extack);
+	/**
+	 * selftests_run() - Runs selftests
+	 * @devlink: Devlink instance
+	 * @skb: message payload
+	 * @tests_mask: tests to be run
+	 * @extack: extack for reporting error messages
+	 *
+	 * Return: 0 on success, negative value otherwise.
+	 */
+	int (*selftests_run)(struct devlink *devlink, struct sk_buff *skb,
+			     u32 tests_mask, struct netlink_ext_ack *extack);
 };
 
 void *devlink_priv(struct devlink *devlink);
@@ -1774,6 +1809,11 @@ void
 devlink_trap_policers_unregister(struct devlink *devlink,
 				 const struct devlink_trap_policer *policers,
 				 size_t policers_count);
+int
+devlink_selftest_result_put(struct sk_buff *skb,
+			    struct devlink_selftest_exec_info *test);
+int
+devlink_selftest_name_put(struct sk_buff *skb, const char *name);
 
 #if IS_ENABLED(CONFIG_NET_DEVLINK)
 
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index b3d40a5d72ff..58e2ef4010f0 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -136,6 +136,9 @@ enum devlink_command {
 	DEVLINK_CMD_LINECARD_NEW,
 	DEVLINK_CMD_LINECARD_DEL,
 
+	DEVLINK_CMD_SELFTESTS_SHOW,
+	DEVLINK_CMD_SELFTESTS_RUN,
+
 	/* add new commands above here */
 	__DEVLINK_CMD_MAX,
 	DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@@ -276,6 +279,21 @@ enum {
 #define DEVLINK_SUPPORTED_FLASH_OVERWRITE_SECTIONS \
 	(_BITUL(__DEVLINK_FLASH_OVERWRITE_MAX_BIT) - 1)
 
+/* Commonly used test cases. Drivers might interpret test bit
+ * in their own way and it may map single to multiple tests.
+ */
+enum {
+	DEVLINK_SELFTEST_FLASH_BIT,
+
+	__DEVLINK_SELFTEST_MAX_BIT,
+	DEVLINK_SELFTEST_MAX_BIT = __DEVLINK_SELFTEST_MAX_BIT - 1
+};
+
+#define DEVLINK_SELFTEST_FLASH _BITUL(DEVLINK_SELFTEST_FLASH_BIT)
+
+#define DEVLINK_SUPPORTED_SELFTESTS \
+	(_BITUL(__DEVLINK_SELFTEST_MAX_BIT) - 1)
+
 /**
  * enum devlink_trap_action - Packet trap action.
  * @DEVLINK_TRAP_ACTION_DROP: Packet is dropped by the device and a copy is not
@@ -576,6 +594,12 @@ enum devlink_attr {
 	DEVLINK_ATTR_LINECARD_TYPE,		/* string */
 	DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES,	/* nested */
 
+	DEVLINK_ATTR_SELFTESTS_MASK,		/* bitfield32 */
+	DEVLINK_ATTR_TEST_NAMES,		/* nested */
+	DEVLINK_ATTR_TEST_NAME,			/* string */
+	DEVLINK_ATTR_TEST_RESULTS,		/* nested */
+	DEVLINK_ATTR_TEST_RESULT,		/* nested */
+	DEVLINK_ATTR_TEST_RESULT_VAL,		/* u8 */
 	/* add new attributes above here, update the policy in devlink.c */
 
 	__DEVLINK_ATTR_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index db61f3a341cb..3c4c27a7dd40 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4794,6 +4794,139 @@ static int devlink_nl_cmd_flash_update(struct sk_buff *skb,
 	return ret;
 }
 
+int devlink_selftest_name_put(struct sk_buff *skb, const char *name)
+{
+	if (nla_put_string(skb, DEVLINK_ATTR_TEST_NAME, name))
+		return -EMSGSIZE;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devlink_selftest_name_put);
+
+static int devlink_nl_cmd_selftests_show(struct sk_buff *skb,
+					 struct genl_info *info)
+{
+	struct devlink *devlink = info->user_ptr[0];
+	struct nlattr  *names_attr;
+	struct sk_buff *msg;
+	void *hdr;
+	int err;
+
+	if (!devlink->ops->selftests_show)
+		return -EOPNOTSUPP;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
+			  &devlink_nl_family, 0, DEVLINK_CMD_SELFTESTS_SHOW);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (devlink_nl_put_handle(msg, devlink))
+		goto genlmsg_cancel;
+
+	names_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_TEST_NAMES);
+	if (!names_attr)
+		goto genlmsg_cancel;
+
+	err =  devlink->ops->selftests_show(devlink, msg, info->extack);
+	if (err)
+		goto names_nest_cancel;
+
+	nla_nest_end(msg, names_attr);
+	genlmsg_end(msg, hdr);
+
+	return genlmsg_reply(msg, info);
+
+names_nest_cancel:
+	nla_nest_cancel(msg, names_attr);
+genlmsg_cancel:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+	return err;
+}
+
+int devlink_selftest_result_put(struct sk_buff *skb,
+				struct devlink_selftest_exec_info *test)
+{
+	struct nlattr *result_attr;
+
+	result_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_TEST_RESULT);
+	if (!result_attr)
+		return -EMSGSIZE;
+
+	if (nla_put_string(skb, DEVLINK_ATTR_TEST_NAME, test->name) ||
+	    nla_put_u8(skb, DEVLINK_ATTR_TEST_RESULT_VAL, test->result))
+		goto nla_put_failure;
+
+	nla_nest_end(skb, result_attr);
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(skb, result_attr);
+	return -EMSGSIZE;
+}
+EXPORT_SYMBOL_GPL(devlink_selftest_result_put);
+
+static int devlink_nl_cmd_selftests_run(struct sk_buff *skb,
+					struct genl_info *info)
+{
+	struct devlink *devlink = info->user_ptr[0];
+	struct nlattr  *nla_selftests_mask;
+	struct nlattr  *results_attr;
+	struct nla_bitfield32 tests;
+	struct sk_buff *msg;
+	u32 tests_mask;
+	void *hdr;
+	int err;
+
+	if (!devlink->ops->selftests_run)
+		return -EOPNOTSUPP;
+
+	if (!info->attrs[DEVLINK_ATTR_SELFTESTS_MASK])
+		return -EINVAL;
+
+	nla_selftests_mask = info->attrs[DEVLINK_ATTR_SELFTESTS_MASK];
+
+	tests = nla_get_bitfield32(nla_selftests_mask);
+	tests_mask = tests.value & tests.selector;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
+			  &devlink_nl_family, 0, DEVLINK_CMD_SELFTESTS_RUN);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (devlink_nl_put_handle(msg, devlink))
+		goto genlmsg_cancel;
+
+	results_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_TEST_RESULTS);
+	if (!results_attr)
+		goto genlmsg_cancel;
+
+	err =  devlink->ops->selftests_run(devlink, msg, tests_mask,
+					   info->extack);
+	if (err)
+		goto results_nest_cancel;
+
+	nla_nest_end(msg, results_attr);
+	genlmsg_end(msg, hdr);
+
+	return genlmsg_reply(msg, info);
+
+results_nest_cancel:
+	nla_nest_cancel(msg, results_attr);
+genlmsg_cancel:
+	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
+	return err;
+}
+
 static const struct devlink_param devlink_param_generic[] = {
 	{
 		.id = DEVLINK_PARAM_GENERIC_ID_INT_ERR_RESET,
@@ -9000,6 +9133,8 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
 	[DEVLINK_ATTR_RATE_PARENT_NODE_NAME] = { .type = NLA_NUL_STRING },
 	[DEVLINK_ATTR_LINECARD_INDEX] = { .type = NLA_U32 },
 	[DEVLINK_ATTR_LINECARD_TYPE] = { .type = NLA_NUL_STRING },
+	[DEVLINK_ATTR_SELFTESTS_MASK] =
+		NLA_POLICY_BITFIELD32(DEVLINK_SUPPORTED_SELFTESTS),
 };
 
 static const struct genl_small_ops devlink_nl_ops[] = {
@@ -9361,6 +9496,18 @@ static const struct genl_small_ops devlink_nl_ops[] = {
 		.doit = devlink_nl_cmd_trap_policer_set_doit,
 		.flags = GENL_ADMIN_PERM,
 	},
+	{
+		.cmd = DEVLINK_CMD_SELFTESTS_SHOW,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit = devlink_nl_cmd_selftests_show,
+		.flags = GENL_ADMIN_PERM,
+	},
+	{
+		.cmd = DEVLINK_CMD_SELFTESTS_RUN,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit = devlink_nl_cmd_selftests_run,
+		.flags = GENL_ADMIN_PERM,
+	},
 };
 
 static struct genl_family devlink_nl_family __ro_after_init = {
-- 
2.31.1

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