ethtool: Disallow ETHTOOL_SRSSH with both indir table and hash key unchanged

This would be a no-op, so there is no reason to request it.

This also allows conversion of the current implementations of
ethtool_ops::{get,set}_rxfh_indir to ethtool_ops::{get,set}_rxfh
with no change other than their parameters.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 886e127d51a6..de687a97c6e7 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -168,8 +168,8 @@ static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
  * @set_rxfh_indir: Set the contents of the RX flow hash indirection table.
  *      Will not be called if @get_rxfh_indir_size returns zero.
  * @set_rxfh: Set the contents of the RX flow hash indirection table and/or
- *      hash key.  Either or both arguments may be %NULL if that attribute
- *      is not to be changed.
+ *      hash key.  In case only the indirection table or hash key is to be
+ *      changed, the other argument will be %NULL.
  *      Will only be called if one or both of @get_rxfh_indir_size and
  *      @get_rxfh_key_size are implemented and return non-zero.
  *      Returns a negative error code or zero.