Implement GET_INFO request to get basic driver and device information as
provided by ETHTOOL_GDRVINFO ioct command. The information is read only so
that the corresponding SET_INFO message is only used in kernel replies.

Move most of ethtool_get_drvinfo() int common.c so that the code can be
shared by both ioctl and netlink interface.

Signed-off-by: Michal Kubecek <redacted>
---
Documentation/networking/ethtool-netlink.txt |  43 ++++-
include/uapi/linux/ethtool_netlink.h         |  30 ++++
net/ethtool/Makefile                         |   2 +-
net/ethtool/common.c                         |  52 ++++++
net/ethtool/common.h                         |   2 +
net/ethtool/info.c                           | 158 +++++++++++++++++++
net/ethtool/ioctl.c                          |  50 +-----
net/ethtool/netlink.c                        |   8 +
net/ethtool/netlink.h                        |   1 +
9 files changed, 299 insertions(+), 47 deletions(-)
create mode 100644 net/ethtool/info.c

diff --git a/Documentation/networking/ethtool-netlink.txt b/Documentation/networking/ethtool-netlink.txt
index 1508c16a236e..cffa508ca6c6 100644
--- a/Documentation/networking/ethtool-netlink.txt
+++ b/Documentation/networking/ethtool-netlink.txt

@@ -129,6 +129,8 @@ List of message types
    ETHNL_CMD_EVENT			notification only
    ETHNL_CMD_GET_STRSET
    ETHNL_CMD_SET_STRSET		response only
+    ETHNL_CMD_GET_INFO
+    ETHNL_CMD_SET_INFO			response only

All constants use ETHNL_CMD_ prefix, usually followed by "GET", "SET" or "ACT"
to indicate the type.

@@ -209,6 +211,45 @@ ETHA_STRSET_COUNTS tells kernel to only return string counts of the sets, not

the actual strings.


+GET_INFO
+--------
+
+GET_INFO requests information provided by ioctl commands ETHTOOL_GDRVINFO,
+ETHTOOL_GPERMADDR and ETHTOOL_GET_TS_INFO to provide basic device information.
+Common pattern is that all information is read only so that SET_INFO message
+exists but is only used by kernel for replies to GET_INFO requests. There is
+also no corresponding notification.
+
+Request contents:
+
+    ETHA_INFO_DEV		(nested)	device identification
+    ETHA_INFO_INFOMASK		(u32)		info mask
+    ETHA_INFO_COMPACT		(flag)		request compact bitsets
+
+Info mask bits meaning:
+
+    ETH_INFO_IM_DRVINFO			driver info (GDRVINFO)
+    ETH_INFO_IM_PERMADDR		permanent HW address (GPERMADDR)
+    ETH_INFO_IM_TSINFO			timestamping info (GET_TS_INFO)
+
+Kernel response contents:
+
+    ETHA_INFO_DEV		(nested)	device identification
+    ETHA_INFO_DRVINFO		(nested)	driver information
+        ETHA_DRVINFO_DRIVER		(string)	driver name
+        ETHA_DRVINFO_FWVERSION		(string)	firmware version
+        ETHA_DRVINFO_BUSINFO		(string)	device bus address
+        ETHA_DRVINFO_EROM_VER		(string)	expansion ROM version