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authorFabian Bläse <fabian@blaese.de>2021-08-29 21:21:35 +0200
committerHauke Mehrtens <hauke@hauke-m.de>2021-09-13 17:11:50 +0200
commitc50ece58c41647880cc74c927d98b465cdfbdad8 (patch)
tree062c0f550a71089ba0ebe1376ae435907c1d96aa
parenta88b32bf6e870baae95eeb129483c3ee1447205e (diff)
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kernel: backport switchdev fix for bridge in bridge configurations
This patch fixes the forwarding behavior of bridge in bridge configurations with DSA. Without it, the configuration of the upper bridge might overwrite settings of the lower bridge. For example, a vlan-aware bridge with DSA interfaces in it might be offloaded to the DSA hardware. If the bridge interface itself gets slave of a different bridge without vlan filtering, the vlan filtering setting of the lower bridge is overwritten by the upper bridge, which results in an incorrect hardware configuration. This was backported from kernel 5.7. Ref: https://lore.kernel.org/netdev/20191222192235.GK25745@shell.armlinux.org.uk/ Fixes: FS#3996 Signed-off-by: Fabian Bläse <fabian@blaese.de>
-rw-r--r--target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch60
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch b/target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch
new file mode 100644
index 0000000000..bc8014b772
--- /dev/null
+++ b/target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch
@@ -0,0 +1,60 @@
+From 07c6f9805f12f1bb538ef165a092b300350384aa Mon Sep 17 00:00:00 2001
+From: Russell King <rmk+kernel@armlinux.org.uk>
+Date: Wed, 26 Feb 2020 17:14:21 +0000
+Subject: [PATCH] net: switchdev: do not propagate bridge updates across
+ bridges
+
+When configuring a tree of independent bridges, propagating changes
+from the upper bridge across a bridge master to the lower bridge
+ports brings surprises.
+
+For example, a lower bridge may have vlan filtering enabled. It
+may have a vlan interface attached to the bridge master, which may
+then be incorporated into another bridge. As soon as the lower
+bridge vlan interface is attached to the upper bridge, the lower
+bridge has vlan filtering disabled.
+
+This occurs because switchdev recursively applies its changes to
+all lower devices no matter what.
+
+Reviewed-by: Ido Schimmel <idosch@mellanox.com>
+Tested-by: Ido Schimmel <idosch@mellanox.com>
+Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/switchdev/switchdev.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/net/switchdev/switchdev.c
++++ b/net/switchdev/switchdev.c
+@@ -476,6 +476,9 @@ static int __switchdev_handle_port_obj_a
+ * necessary to go through this helper.
+ */
+ netdev_for_each_lower_dev(dev, lower_dev, iter) {
++ if (netif_is_bridge_master(lower_dev))
++ continue;
++
+ err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
+ check_cb, add_cb);
+ if (err && err != -EOPNOTSUPP)
+@@ -528,6 +531,9 @@ static int __switchdev_handle_port_obj_d
+ * necessary to go through this helper.
+ */
+ netdev_for_each_lower_dev(dev, lower_dev, iter) {
++ if (netif_is_bridge_master(lower_dev))
++ continue;
++
+ err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
+ check_cb, del_cb);
+ if (err && err != -EOPNOTSUPP)
+@@ -579,6 +585,9 @@ static int __switchdev_handle_port_attr_
+ * necessary to go through this helper.
+ */
+ netdev_for_each_lower_dev(dev, lower_dev, iter) {
++ if (netif_is_bridge_master(lower_dev))
++ continue;
++
+ err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
+ check_cb, set_cb);
+ if (err && err != -EOPNOTSUPP)