From 61d88c6811f216de4ec26aafe24e650dc1aeb00e Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Mon, 19 May 2014 01:29:42 +0100
Subject: [PATCH] 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>
---
include/linux/ethtool.h | 4 ++--
net/core/ethtool.c | 5 ++++-
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 886e127d51a61..de687a97c6e78 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.
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 7156fe5ca8762..b8857348bdf3b 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -802,11 +802,14 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
return -EFAULT;
/* If either indir or hash key is valid, proceed further.
+ * It is not valid to request that both be unchanged.
*/
if ((user_indir_size &&
user_indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
user_indir_size != dev_indir_size) ||
- (user_key_size && (user_key_size != dev_key_size)))
+ (user_key_size && (user_key_size != dev_key_size)) ||
+ (user_indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
+ user_key_size == 0))
return -EINVAL;
if (user_indir_size != ETH_RXFH_INDIR_NO_CHANGE)