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authorJarod Wilson <jarod@redhat.com>2015-11-03 10:15:59 -0500
committerDavid S. Miller <davem@davemloft.net>2015-11-03 11:29:57 -0500
commit5ba3f7d61a3a9e6d94462b207d302931b53d8c61 (patch)
tree1b9db4afc4a9f925eb3eb480bb9657e841b9d0d8 /net
parent74f2d19caff885bc656e9acf2a6e727b66ab0ed1 (diff)
downloadlinux-5ba3f7d61a3a9e6d94462b207d302931b53d8c61.tar.bz2
net/core: fix for_each_netdev_feature
As pointed out by Nikolay and further explained by Geert, the initial for_each_netdev_feature macro was broken, as feature would get set outside of the block of code it was intended to run in, thus only ever working for the first feature bit in the mask. While less pretty this way, this is tested and confirmed functional with multiple feature bits set in NETIF_F_UPPER_DISABLES. [root@dell-per730-01 ~]# ethtool -K bond0 lro off ... [ 242.761394] bond0: Disabling feature 0x0000000000008000 on lower dev p5p2. [ 243.552178] bnx2x 0000:06:00.1 p5p2: using MSI-X IRQs: sp 74 fp[0] 76 ... fp[7] 83 [ 244.353978] bond0: Disabling feature 0x0000000000008000 on lower dev p5p1. [ 245.147420] bnx2x 0000:06:00.0 p5p1: using MSI-X IRQs: sp 62 fp[0] 64 ... fp[7] 71 [root@dell-per730-01 ~]# ethtool -K bond0 gro off ... [ 251.925645] bond0: Disabling feature 0x0000000000004000 on lower dev p5p2. [ 252.713693] bnx2x 0000:06:00.1 p5p2: using MSI-X IRQs: sp 74 fp[0] 76 ... fp[7] 83 [ 253.499085] bond0: Disabling feature 0x0000000000004000 on lower dev p5p1. [ 254.290922] bnx2x 0000:06:00.0 p5p1: using MSI-X IRQs: sp 62 fp[0] 64 ... fp[7] 71 Fixes: fd867d51f ("net/core: generic support for disabling netdev features down stack") CC: "David S. Miller" <davem@davemloft.net> CC: Eric Dumazet <edumazet@google.com> CC: Jay Vosburgh <j.vosburgh@gmail.com> CC: Veaceslav Falico <vfalico@gmail.com> CC: Andy Gospodarek <gospo@cumulusnetworks.com> CC: Jiri Pirko <jiri@resnulli.us> CC: Nikolay Aleksandrov <razor@blackwall.org> CC: Michal Kubecek <mkubecek@suse.cz> CC: Alexander Duyck <alexander.duyck@gmail.com> CC: Geert Uytterhoeven <geert@linux-m68k.org> CC: netdev@vger.kernel.org Signed-off-by: Jarod Wilson <jarod@redhat.com> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index c4d2b430788d..8ce3f74cd6b9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6293,8 +6293,10 @@ static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
{
netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
netdev_features_t feature;
+ int feature_bit;
- for_each_netdev_feature(&upper_disables, feature) {
+ for_each_netdev_feature(&upper_disables, feature_bit) {
+ feature = __NETIF_F_BIT(feature_bit);
if (!(upper->wanted_features & feature)
&& (features & feature)) {
netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
@@ -6311,8 +6313,10 @@ static void netdev_sync_lower_features(struct net_device *upper,
{
netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
netdev_features_t feature;
+ int feature_bit;
- for_each_netdev_feature(&upper_disables, feature) {
+ for_each_netdev_feature(&upper_disables, feature_bit) {
+ feature = __NETIF_F_BIT(feature_bit);
if (!(features & feature) && (lower->features & feature)) {
netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
&feature, lower->name);