RFC: Network driver info to userspace

In various scenarios where userland needs to interact with hardware, userland often needs to know exactly what driver (and driver version) is currently running on a given interface. Hotplugging and other applications could -really- use the ability to find out bus information for a given interface. Firmware

So I propose the attached addition to the ethtool interface. It adds a new structure with several ASCII text fields, which are filled in at the driver's discretion. Userland then interprets these fields for their own evil designs.

Currently (AFAIK) for all kernel interfaces, userland has no reliable way to associate a hardware device with a kernel interface, or a driver with a kernel interface[1]. Since we have no generic register_driver() interface, solving this problem means implementing a domain-specific solution like I have done here...

Jeff Garzik       | May you have warm words on a cold evening,
Building 1024     | a full mooon on a dark night,
MandrakeSoft      | and a smooth road all the way to your door.

Index: include/linux/ethtool.h
===================================================================
RCS file: /cvsroot/gkernel/linux_2_4/include/linux/Attic/ethtool.h,v retrieving revision 1.1.1.2

diff -u -r1.1.1.2 ethtool.h
@@ -24,10 +24,21 @@
 	u32	reserved[4];
 };
 
+/* these strings are set to whatever the driver author decides... */
+struct ethtool_drvinfo {
+	char	driver[32];	/* driver short name, "tulip", "eepro100" */
+	char	version[32];	/* driver version string */
+	char	fw_version[32];	/* firmware version string, if applicable */
+	char	bus_info[32];	/* Bus info for this interface.  For PCI
+				 * devices, use pci_dev->slot_name. */
+	char	reserved1[32];
+	char	reserved2[32];
+};
 
 /* CMDs currently supported */
-#define ETHTOOL_GSET		0x00000001 /* Get settings, non-privileged. */
+#define ETHTOOL_GSET		0x00000001 /* Get settings. */
 #define ETHTOOL_SSET		0x00000002 /* Set settings, privileged. */
+#define ETHTOOL_GDRVINFO	0x00000003 /* Get driver info. */
 
 /* compatibility with older code */
 #define SPARC_ETH_GSET		ETHTOOL_GSET