ethtool: Name the 'no change' value for setting RSS hash key but not indir table
We usually allocate special values of u32 fields starting from the top
down, so also change the value to 0xffffffff. As these operations
haven't been included in a stable release yet, it's not too late to
change.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index d47d31d..cba18e3 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -850,7 +850,8 @@
* struct ethtool_rxfh - command to get/set RX flow hash indir or/and hash key.
* @cmd: Specific command number - %ETHTOOL_GRSSH or %ETHTOOL_SRSSH
* @rss_context: RSS context identifier.
- * @indir_size: On entry, the array size of the user buffer, which may be zero.
+ * @indir_size: On entry, the array size of the user buffer, which may be zero,
+ * or (for %ETHTOOL_SRSSH), %ETH_RXFH_INDIR_NO_CHANGE.
* On return from %ETHTOOL_GRSSH, the array size of the hardware
* indirection table.
* @key_size: On entry, the array size of the user buffer in bytes,
@@ -861,10 +862,10 @@
* of size @indir_size followed by hash key of size @key_size.
*
* For %ETHTOOL_GRSSH, a @indir_size and key_size of zero means that only the
- * size should be returned. For %ETHTOOL_SRSSH, a @indir_size of 0xDEADBEEF
- * means that indir table setting is not requested and a @indir_size of zero
- * means the indir table should be reset to default values. This last feature
- * is not supported by the original implementations.
+ * size should be returned. For %ETHTOOL_SRSSH, an @indir_size of
+ * %ETH_RXFH_INDIR_NO_CHANGE means that indir table setting is not requested
+ * and a @indir_size of zero means the indir table should be reset to default
+ * values.
*/
struct ethtool_rxfh {
__u32 cmd;
@@ -874,6 +875,7 @@
__u32 rsvd[2];
__u32 rss_config[0];
};
+#define ETH_RXFH_INDIR_NO_CHANGE 0xffffffff
/**
* struct ethtool_rx_ntuple_flow_spec - specification for RX flow filter