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From:   Andy Gospodarek <andrew.gospodarek@broadcom.com>
Date:   Wed, 27 Jul 2022 08:35:08 -0400
To:     Jiri Pirko <jiri@nvidia.com>
Cc:     Vikas Gupta <vikas.gupta@broadcom.com>, kuba@kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        davem@davemloft.net, dsahern@kernel.org,
        stephen@networkplumber.org, edumazet@google.com, pabeni@redhat.com,
        ast@kernel.org, leon@kernel.org, linux-doc@vger.kernel.org,
        corbet@lwn.net, michael.chan@broadcom.com,
        andrew.gospodarek@broadcom.com
Subject: Re: [PATCH net-next v7 1/2] devlink: introduce framework for
 selftests
Message-ID: <YuEw/CjmNLsJH1D1@C02YVCJELVCG>
References: <20220727063719.35125-1-vikas.gupta@broadcom.com>
 <20220727063719.35125-2-vikas.gupta@broadcom.com>
 <YuDouKrha/a+0uDT@nanopsycho>
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On Wed, Jul 27, 2022 at 09:26:48AM +0200, Jiri Pirko wrote:
> Wed, Jul 27, 2022 at 08:37:18AM CEST, vikas.gupta@broadcom.com wrote:
> >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.
> >
> >Below are new entries in devlink_nl_ops
> >devlink_nl_cmd_selftests_show_doit/dumpit: To query the supported
> >selftests by the drivers.
> >devlink_nl_cmd_selftests_run: To execute selftests. Users can
> >provide a test mask for executing group tests or standalone tests.
> >
> >Documentation/networking/devlink/ path is already part of MAINTAINERS &
> >the new files come under this path. Hence no update needed to the
> >MAINTAINERS
> >
> >Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
> >Reviewed-by: Michael Chan <michael.chan@broadcom.com>
> >Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
> 
> Note that if the patch changed since the person provided the review tag,
> you should drop it. I'm pretty sure that you carry these tags from V1.

To give Vikas credit on this, I think most (if not all) were reviewed
internally before sending out to the list, so it wasn't a total cut and
paste of these for each revision.  :)

> Looks good, couple small nits and I will be fine :)

Great!  Thanks for the detailed review.

> 
> 
> >---
> > .../networking/devlink/devlink-selftests.rst  |  38 +++
> > include/net/devlink.h                         |  21 ++
> > include/uapi/linux/devlink.h                  |  29 +++
> > net/core/devlink.c                            | 216 ++++++++++++++++++
> > 4 files changed, 304 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..c0aa1f3aef0d
> >--- /dev/null
> >+++ b/Documentation/networking/devlink/devlink-selftests.rst
> >@@ -0,0 +1,38 @@
> >+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >+
> >+=================
> >+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``
> >+     - Devices may have the firmware on non-volatile memory on the board, e.g.
> >+       flash. This particular test helps to run a flash selftest on the device.
> >+       Implementation of the test is left to the driver/firmware.
> >+
> >+example usage
> >+-------------
> >+
> >+.. code:: shell
> >+
> >+    # Query selftests supported on the devlink device
> >+    $ devlink dev selftests show DEV
> >+    # Query selftests supported on all devlink devices
> >+    $ devlink dev selftests show
> >+    # Executes selftests on the device
> >+    $ devlink dev selftests run DEV id flash
> >diff --git a/include/net/devlink.h b/include/net/devlink.h
> >index 5bd3fac12e9e..b311055cc29a 100644
> >--- a/include/net/devlink.h
> >+++ b/include/net/devlink.h
> >@@ -1509,6 +1509,27 @@ struct devlink_ops {
> > 				    struct devlink_rate *parent,
> > 				    void *priv_child, void *priv_parent,
> > 				    struct netlink_ext_ack *extack);
> >+	/**
> >+	 * selftests_check() - queries if selftest is supported
> >+	 * @devlink: devlink instance
> >+	 * @test_id: test index
> >+	 * @extack: extack for reporting error messages
> >+	 *
> >+	 * Return: true if test is supported by the driver
> >+	 */
> >+	bool (*selftest_check)(struct devlink *devlink, unsigned int test_id,
> 
> Should be just "id" to be consistent with the rest of the code.
> 
> 
> >+			       struct netlink_ext_ack *extack);
> >+	/**
> >+	 * selftest_run() - Runs a selftest
> >+	 * @devlink: devlink instance
> >+	 * @test_id: test index
> >+	 * @extack: extack for reporting error messages
> >+	 *
> >+	 * Return: status of the test
> >+	 */
> >+	enum devlink_selftest_status
> >+	(*selftest_run)(struct devlink *devlink, unsigned int test_id,
> 
> Same here.
> 
> 
> >+			struct netlink_ext_ack *extack);
> > };
> > 
> > void *devlink_priv(struct devlink *devlink);
> >diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
> >index 541321695f52..d6e2d3b76e47 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_GET,	/* can dump */
> >+	DEVLINK_CMD_SELFTESTS_RUN,
> >+
> > 	/* add new commands above here */
> > 	__DEVLINK_CMD_MAX,
> > 	DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
> >@@ -276,6 +279,30 @@ enum {
> > #define DEVLINK_SUPPORTED_FLASH_OVERWRITE_SECTIONS \
> > 	(_BITUL(__DEVLINK_FLASH_OVERWRITE_MAX_BIT) - 1)
> > 
> >+enum devlink_attr_selftest_id {
> >+	DEVLINK_ATTR_SELFTEST_ID_UNSPEC,
> >+	DEVLINK_ATTR_SELFTEST_ID_FLASH,	/* flag */
> >+
> >+	__DEVLINK_ATTR_SELFTEST_ID_MAX,
> >+	DEVLINK_ATTR_SELFTEST_ID_MAX = __DEVLINK_ATTR_SELFTEST_ID_MAX - 1
> >+};
> >+
> >+enum devlink_selftest_status {
> >+	DEVLINK_SELFTEST_STATUS_SKIP,
> >+	DEVLINK_SELFTEST_STATUS_PASS,
> >+	DEVLINK_SELFTEST_STATUS_FAIL
> >+};
> >+
> >+enum devlink_attr_selftest_result {
> >+	DEVLINK_ATTR_SELFTEST_RESULT_UNSPEC,
> >+	DEVLINK_ATTR_SELFTEST_RESULT,		/* nested */
> >+	DEVLINK_ATTR_SELFTEST_RESULT_ID,	/* u32, enum devlink_attr_selftest_id */
> >+	DEVLINK_ATTR_SELFTEST_RESULT_STATUS,	/* u8, enum devlink_selftest_status */
> >+
> >+	__DEVLINK_ATTR_SELFTEST_RESULT_MAX,
> >+	DEVLINK_ATTR_SELFTEST_RESULT_MAX = __DEVLINK_ATTR_SELFTEST_RESULT_MAX - 1
> >+};
> >+
> > /**
> >  * enum devlink_trap_action - Packet trap action.
> >  * @DEVLINK_TRAP_ACTION_DROP: Packet is dropped by the device and a copy is not
> >@@ -578,6 +605,8 @@ enum devlink_attr {
> > 
> > 	DEVLINK_ATTR_NESTED_DEVLINK,		/* nested */
> > 
> >+	DEVLINK_ATTR_SELFTESTS_INFO,		/* nested */
> 
> Drop "INFO". There are no information, just data passed there and back.
> "info" is odd. DEVLINK_ATTR_SELFTESTS is enough to carry the data there
> and back.
> 
> 
> >+
> > 	/* 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 698b2d6e0ec7..a942b3c9223c 100644
> >--- a/net/core/devlink.c
> >+++ b/net/core/devlink.c
> >@@ -201,6 +201,10 @@ static const struct nla_policy devlink_function_nl_policy[DEVLINK_PORT_FUNCTION_
> > 				 DEVLINK_PORT_FN_STATE_ACTIVE),
> > };
> > 
> >+static const struct nla_policy devlink_selftest_nl_policy[DEVLINK_ATTR_SELFTEST_ID_MAX + 1] = {
> >+	[DEVLINK_ATTR_SELFTEST_ID_FLASH] = { .type = NLA_FLAG },
> >+};
> >+
> > static DEFINE_XARRAY_FLAGS(devlinks, XA_FLAGS_ALLOC);
> > #define DEVLINK_REGISTERED XA_MARK_1
> > 
> >@@ -4827,6 +4831,206 @@ static int devlink_nl_cmd_flash_update(struct sk_buff *skb,
> > 	return ret;
> > }
> > 
> >+static int
> >+devlink_nl_selftests_fill(struct sk_buff *msg, struct devlink *devlink,
> >+			  u32 portid, u32 seq, int flags,
> >+			  struct netlink_ext_ack *extack)
> >+{
> >+	struct nlattr *selftests_list;
> >+	void *hdr;
> >+	int err;
> >+	int i;
> >+
> >+	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags,
> >+			  DEVLINK_CMD_SELFTESTS_GET);
> >+	if (!hdr)
> >+		return -EMSGSIZE;
> >+
> >+	err = -EMSGSIZE;
> >+	if (devlink_nl_put_handle(msg, devlink))
> >+		goto err_cancel_msg;
> >+
> >+	selftests_list = nla_nest_start(msg, DEVLINK_ATTR_SELFTESTS_INFO);
> >+	if (!selftests_list)
> >+		goto err_cancel_msg;
> >+
> >+	for (i = DEVLINK_ATTR_SELFTEST_ID_UNSPEC + 1;
> >+	     i <= DEVLINK_ATTR_SELFTEST_ID_MAX; i++) {
> >+		if (devlink->ops->selftest_check(devlink, i, extack)) {
> >+			err = nla_put_flag(msg, i);
> >+			if (err)
> >+				goto err_cancel_msg;
> >+		}
> >+	}
> >+
> >+	nla_nest_end(msg, selftests_list);
> >+	genlmsg_end(msg, hdr);
> >+	return 0;
> >+
> >+err_cancel_msg:
> >+	genlmsg_cancel(msg, hdr);
> >+	return err;
> >+}
> >+
> >+static int devlink_nl_cmd_selftests_get_doit(struct sk_buff *skb,
> >+					     struct genl_info *info)
> >+{
> >+	struct devlink *devlink = info->user_ptr[0];
> >+	struct sk_buff *msg;
> >+	int err;
> >+
> >+	if (!devlink->ops->selftest_check)
> >+		return -EOPNOTSUPP;
> >+
> >+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
> >+	if (!msg)
> >+		return -ENOMEM;
> >+
> >+	err = devlink_nl_selftests_fill(msg, devlink, info->snd_portid,
> >+					info->snd_seq, 0, info->extack);
> >+	if (err) {
> >+		nlmsg_free(msg);
> >+		return err;
> >+	}
> >+
> >+	return genlmsg_reply(msg, info);
> >+}
> >+
> >+static int devlink_nl_cmd_selftests_get_dumpit(struct sk_buff *msg,
> >+					       struct netlink_callback *cb)
> >+{
> >+	struct devlink *devlink;
> >+	int start = cb->args[0];
> >+	unsigned long index;
> >+	int idx = 0;
> >+	int err = 0;
> >+
> >+	mutex_lock(&devlink_mutex);
> >+	devlinks_xa_for_each_registered_get(sock_net(msg->sk), index, devlink) {
> >+		if (idx < start || !devlink->ops->selftest_check)
> >+			goto inc;
> >+
> >+		devl_lock(devlink);
> >+		err = devlink_nl_selftests_fill(msg, devlink,
> >+						NETLINK_CB(cb->skb).portid,
> >+						cb->nlh->nlmsg_seq, NLM_F_MULTI,
> >+						cb->extack);
> >+		devl_unlock(devlink);
> >+		if (err) {
> >+			devlink_put(devlink);
> >+			break;
> >+		}
> >+inc:
> >+		idx++;
> >+		devlink_put(devlink);
> >+	}
> >+	mutex_unlock(&devlink_mutex);
> >+
> >+	if (err != -EMSGSIZE)
> >+		return err;
> >+
> >+	cb->args[0] = idx;
> >+	return msg->len;
> >+}
> >+
> >+static int devlink_selftest_result_put(struct sk_buff *skb, unsigned int test_id,
> >+				       enum devlink_selftest_status test_status)
> >+{
> >+	struct nlattr *result_attr;
> >+
> >+	result_attr = nla_nest_start(skb, DEVLINK_ATTR_SELFTEST_RESULT);
> >+	if (!result_attr)
> >+		return -EMSGSIZE;
> >+
> >+	if (nla_put_u32(skb, DEVLINK_ATTR_SELFTEST_RESULT_ID, test_id) ||
> >+	    nla_put_u8(skb, DEVLINK_ATTR_SELFTEST_RESULT_STATUS,
> >+		       test_status))
> >+		goto nla_put_failure;
> >+
> >+	nla_nest_end(skb, result_attr);
> >+	return 0;
> >+
> >+nla_put_failure:
> >+	nla_nest_cancel(skb, result_attr);
> >+	return -EMSGSIZE;
> >+}
> >+
> >+static int devlink_nl_cmd_selftests_run(struct sk_buff *skb,
> >+					struct genl_info *info)
> >+{
> >+	struct nlattr *tb[DEVLINK_ATTR_SELFTEST_ID_MAX + 1];
> >+	struct devlink *devlink = info->user_ptr[0];
> >+	struct nlattr *attrs, *tests_info;
> >+	struct sk_buff *msg;
> >+	void *hdr;
> >+	int err;
> >+	int i;
> >+
> >+	if (!devlink->ops->selftest_run || !devlink->ops->selftest_check)
> >+		return -EOPNOTSUPP;
> >+
> >+	if (!info->attrs[DEVLINK_ATTR_SELFTESTS_INFO]) {
> >+		NL_SET_ERR_MSG_MOD(info->extack, "selftest information required");
> 
> no "information"
> 
> 
> >+		return -EINVAL;
> >+	}
> >+
> >+	attrs = info->attrs[DEVLINK_ATTR_SELFTESTS_INFO];
> >+
> >+	err = nla_parse_nested(tb, DEVLINK_ATTR_SELFTEST_ID_MAX, attrs,
> >+			       devlink_selftest_nl_policy, info->extack);
> >+	if (err < 0)
> >+		return err;
> >+
> >+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
> >+	if (!msg)
> >+		return -ENOMEM;
> >+
> >+	err = -EMSGSIZE;
> >+	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
> >+			  &devlink_nl_family, 0, DEVLINK_CMD_SELFTESTS_RUN);
> >+	if (!hdr)
> >+		goto free_msg;
> >+
> >+	if (devlink_nl_put_handle(msg, devlink))
> >+		goto genlmsg_cancel;
> >+
> >+	tests_info = nla_nest_start(msg, DEVLINK_ATTR_SELFTESTS_INFO);
> >+	if (!tests_info)
> >+		goto genlmsg_cancel;
> >+
> >+	for (i = DEVLINK_ATTR_SELFTEST_ID_UNSPEC + 1;
> >+	     i <= DEVLINK_ATTR_SELFTEST_ID_MAX; i++) {
> >+		enum devlink_selftest_status test_status;
> >+
> >+		if (nla_get_flag(tb[i])) {
> >+			if (!devlink->ops->selftest_check(devlink, i,
> >+							  info->extack)) {
> >+				if (devlink_selftest_result_put(msg, i,
> >+								DEVLINK_SELFTEST_STATUS_SKIP))
> >+					goto selftests_info_nest_cancel;
> >+				continue;
> >+			}
> >+
> >+			test_status = devlink->ops->selftest_run(devlink, i,
> >+								 info->extack);
> >+			if (devlink_selftest_result_put(msg, i, test_status))
> >+				goto selftests_info_nest_cancel;
> >+		}
> >+	}
> >+
> >+	nla_nest_end(msg, tests_info);
> >+	genlmsg_end(msg, hdr);
> >+	return genlmsg_reply(msg, info);
> >+
> >+selftests_info_nest_cancel:
> >+	nla_nest_cancel(msg, tests_info);
> >+genlmsg_cancel:
> >+	genlmsg_cancel(msg, hdr);
> >+free_msg:
> >+	nlmsg_free(msg);
> >+	return err;
> >+}
> >+
> > static const struct devlink_param devlink_param_generic[] = {
> > 	{
> > 		.id = DEVLINK_PARAM_GENERIC_ID_INT_ERR_RESET,
> >@@ -8970,6 +9174,7 @@ 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_INFO] = { .type = NLA_NESTED },
> > };
> > 
> > static const struct genl_small_ops devlink_nl_ops[] = {
> >@@ -9329,6 +9534,17 @@ 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_GET,
> >+		.doit = devlink_nl_cmd_selftests_get_doit,
> >+		.dumpit = devlink_nl_cmd_selftests_get_dumpit
> >+		/* can be retrieved by unprivileged users */
> >+	},
> >+	{
> >+		.cmd = DEVLINK_CMD_SELFTESTS_RUN,
> >+		.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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