netdev - [PATCH net-next v2 2/7] devlink: add version reporting to devlink info API

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Date:   Wed, 30 Jan 2019 11:05:08 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        jiri@...nulli.us, andrew@...n.ch, f.fainelli@...il.com,
        mkubecek@...e.cz, eugenem@...com, jonathan.lemon@...il.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next v2 2/7] devlink: add version reporting to devlink info API

ethtool -i has a few fixed-size fields which can be used to report
firmware version and expansion ROM version.  Unfortunately, modern
hardware has more firmware components.  There is usually some
datapath microcode, management controller, PXE drivers, and a
CPLD load.  Running ethtool -i on modern controllers reveals the
fact that vendors cram multiple values into firmware version field.

Here are some examples from systems I could lay my hands on quickly:

tg3:  "FFV20.2.17 bc 5720-v1.39"
i40e: "6.01 0x800034a4 1.1747.0"
nfp:  "0.0.3.5 0.25 sriov-2.1.16 nic"

Add a new devlink API to allow retrieving multiple versions, and
provide user-readable name for those versions.

While at it break down the versions into three categories:
 - fixed - this is the board/fixed component version, usually vendors
           report information like the board version in the PCI VPD,
           but it will benefit from naming and common API as well;
 - running - this is the running firmware version;
 - stored - this is firmware in the flash, after firmware update
            this value will reflect the flashed version, while the
            running version may only be updated after reboot.

RFCv2:
 - remove the nesting in attr DEVLINK_ATTR_INFO_VERSIONS (now
   versions are mixed with other info attrs)l
 - have the driver report versions from the same callback as
   other info.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 include/net/devlink.h        | 18 ++++++++++++++++
 include/uapi/linux/devlink.h |  5 +++++
 net/core/devlink.c           | 40 ++++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 5ef3570a3859..ec72638aa47f 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -428,6 +428,12 @@ enum devlink_param_wol_types {
 	.validate = _validate,						\
 }
 
+enum devlink_version_type {
+	DEVLINK_VERSION_FIXED,
+	DEVLINK_VERSION_STORED,
+	DEVLINK_VERSION_RUNNING,
+};
+
 struct devlink_region;
 struct devlink_info_req;
 
@@ -614,6 +620,10 @@ int devlink_info_report_serial_number(struct devlink_info_req *req,
 				      const char *sn);
 int devlink_info_report_driver_name(struct devlink_info_req *req,
 				    const char *name);
+int devlink_info_report_version(struct devlink_info_req *req,
+				enum devlink_version_type type,
+				const char *version_name,
+				const char *version_value);
 
 #else
 
@@ -923,6 +933,14 @@ devlink_info_report_serial_number(struct devlink_info_req *req, const char *sn)
 {
 	return 0;
 }
+
+static inline int
+devlink_info_report_version(struct devlink_info_req *req,
+			    enum devlink_version_type type,
+			    const char *version_name, const char *version_value)
+{
+	return 0;
+}
 #endif
 
 #endif /* _NET_DEVLINK_H_ */
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index fd089baa7c50..a61b87c73c3f 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -294,6 +294,11 @@ enum devlink_attr {
 
 	DEVLINK_ATTR_INFO_DRV_NAME,		/* string */
 	DEVLINK_ATTR_INFO_SERIAL_NUMBER,	/* string */
+	DEVLINK_ATTR_INFO_VERSION_FIXED,	/* nested */
+	DEVLINK_ATTR_INFO_VERSION_RUNNING,	/* nested */
+	DEVLINK_ATTR_INFO_VERSION_STORED,	/* nested */
+	DEVLINK_ATTR_INFO_VERSION_NAME,		/* string */
+	DEVLINK_ATTR_INFO_VERSION_VALUE,	/* string */
 
 	/* add new attributes above here, update the policy in devlink.c */
 
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 1b941493fdff..e2027d3a5e40 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3732,6 +3732,46 @@ int devlink_info_report_serial_number(struct devlink_info_req *req,
 }
 EXPORT_SYMBOL_GPL(devlink_info_report_serial_number);
 
+int devlink_info_report_version(struct devlink_info_req *req,
+				enum devlink_version_type type,
+				const char *version_name,
+				const char *version_value)
+{
+	static const enum devlink_attr type2attr[] = {
+		[DEVLINK_VERSION_FIXED] = DEVLINK_ATTR_INFO_VERSION_FIXED,
+		[DEVLINK_VERSION_STORED] = DEVLINK_ATTR_INFO_VERSION_STORED,
+		[DEVLINK_VERSION_RUNNING] = DEVLINK_ATTR_INFO_VERSION_RUNNING,
+	};
+	struct nlattr *nest;
+	int err;
+
+	if (type >= ARRAY_SIZE(type2attr) || !type2attr[type])
+		return -EINVAL;
+
+	nest = nla_nest_start(req->msg, type2attr[type]);
+	if (!nest)
+		return -EMSGSIZE;
+
+	err = nla_put_string(req->msg, DEVLINK_ATTR_INFO_VERSION_NAME,
+			     version_name);
+	if (err)
+		goto nla_put_failure;
+
+	err = nla_put_string(req->msg, DEVLINK_ATTR_INFO_VERSION_VALUE,
+			     version_value);
+	if (err)
+		goto nla_put_failure;
+
+	nla_nest_end(req->msg, nest);
+
+	return 0;
+
+nla_put_failure:
+	nla_nest_cancel(req->msg, nest);
+	return err;
+}
+EXPORT_SYMBOL_GPL(devlink_info_report_version);
+
 static int
 devlink_nl_info_fill(struct sk_buff *msg, struct devlink *devlink,
 		     enum devlink_command cmd, u32 portid,
-- 
2.19.2