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>

1 files changed, 7 insertions, 5 deletions

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index c834cb29f682..7156fe5ca876 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -803,12 +803,13 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
 
         /* If either indir or hash key is valid, proceed further.
          */
-        if ((user_indir_size && ((user_indir_size != 0xDEADBEEF) &&
-                                 user_indir_size != dev_indir_size)) ||
+        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)))
                 return -EINVAL;
 
-        if (user_indir_size != 0xDEADBEEF)
+        if (user_indir_size != ETH_RXFH_INDIR_NO_CHANGE)
                 indir_bytes = dev_indir_size * sizeof(indir[0]);
 
         rss_config = kzalloc(indir_bytes + user_key_size, GFP_USER);
@@ -821,9 +822,10 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
                 goto out;
 
         /* user_indir_size == 0 means reset the indir table to default.
-         * user_indir_size == 0xDEADBEEF means indir setting is not requested.
+         * user_indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
          */
-        if (user_indir_size && user_indir_size != 0xDEADBEEF) {
+        if (user_indir_size &&
+            user_indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
                 indir = (u32 *)rss_config;
                 ret = ethtool_copy_validate_indir(indir,
                                                   useraddr + rss_cfg_offset,