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ethtool: Expand documentation of struct ethtool_regs

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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2014-02-12 22:14:13 +00:00
committed by David S. Miller
parent 02d59f3fdb
commit 09fb8bb068
1 changed files with 17 additions and 3 deletions
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20
include/uapi/linux/ethtool.h
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@@ -209,11 +209,25 @@ struct ethtool_value {
__u32 data; __u32 data;
}; };
/* for passing big chunks of data */ /**
* struct ethtool_regs - hardware register dump
* @cmd: Command number = %ETHTOOL_GREGS
* @version: Dump format version. This is driver-specific and may
* distinguish different chips/revisions. Drivers must use new
* version numbers whenever the dump format changes in an
* incompatible way.
* @len: On entry, the real length of @data. On return, the number of
* bytes used.
* @data: Buffer for the register dump
*
* Users should use %ETHTOOL_GDRVINFO to find the maximum length of
* a register dump for the interface. They must allocate the buffer
* immediately following this structure.
*/
struct ethtool_regs { struct ethtool_regs {
__u32 cmd; __u32 cmd;
__u32 version; /* driver-specific, indicates different chips/revs */ __u32 version;
__u32 len; /* bytes */ __u32 len;
__u8 data[0]; __u8 data[0];
}; };