diff mbox series

[v3,net-next,03/12] net: dsa: inherit the actual bridge port flags at join time

Message ID 20210320223448.2452869-4-olteanv@gmail.com
State New
Headers show
Series Better support for sandwiched LAGs with bridge and DSA | expand

Commit Message

Vladimir Oltean March 20, 2021, 10:34 p.m. UTC 
From: Vladimir Oltean <vladimir.oltean@nxp.com>

DSA currently assumes that the bridge port starts off with this
constellation of bridge port flags:

- learning on
- unicast flooding on
- multicast flooding on
- broadcast flooding on

just by virtue of code copy-pasta from the bridge layer (new_nbp).
This was a simple enough strategy thus far, because the 'bridge join'
moment always coincided with the 'bridge port creation' moment.

But with sandwiched interfaces, such as:

 br0
  |
bond0
  |
 swp0

it may happen that the user has had time to change the bridge port flags
of bond0 before enslaving swp0 to it. In that case, swp0 will falsely
assume that the bridge port flags are those determined by new_nbp, when
in fact this can happen:

ip link add br0 type bridge
ip link add bond0 type bond
ip link set bond0 master br0
ip link set bond0 type bridge_slave learning off
ip link set swp0 master br0

Now swp0 has learning enabled, bond0 has learning disabled. Not nice.

Fix this by "dumpster diving" through the actual bridge port flags with
br_port_flag_is_set, at bridge join time.

We use this opportunity to split dsa_port_change_brport_flags into two
distinct functions called dsa_port_inherit_brport_flags and
dsa_port_clear_brport_flags, now that the implementation for the two
cases is no longer similar.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
Changes in v3:
Rewrote dsa_port_clear_brport_flags to at least catch errors, and to use
the same "for" loop structure as dsa_port_inherit_brport_flags.

 net/dsa/port.c | 125 ++++++++++++++++++++++++++++++++-----------------
 1 file changed, 83 insertions(+), 42 deletions(-)

Comments

kernel test robot March 21, 2021, 12:13 a.m. UTC | #1 
Hi Vladimir,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Vladimir-Oltean/Better-support-for-sandwiched-LAGs-with-bridge-and-DSA/20210321-063842
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git d773b7957e4fd7b732a163df0e59d31ad4237302
config: arm-mvebu_v5_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/3aac17167e3de0aeaf5287f9d586725bdc7495a5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Vladimir-Oltean/Better-support-for-sandwiched-LAGs-with-bridge-and-DSA/20210321-063842
        git checkout 3aac17167e3de0aeaf5287f9d586725bdc7495a5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/device.h:15,
                    from include/linux/dma-mapping.h:7,
                    from include/linux/skbuff.h:31,
                    from include/net/net_namespace.h:39,
                    from include/linux/netdevice.h:37,
                    from include/linux/if_bridge.h:12,
                    from net/dsa/port.c:9:
   net/dsa/port.c: In function 'dsa_port_clear_brport_flags':
>> net/dsa/port.c:166:5: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long unsigned int' [-Wformat=]
     166 |     "failed to clear bridge port flag %d: %d (%pe)\n",
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:19:22: note: in definition of macro 'dev_fmt'
      19 | #define dev_fmt(fmt) fmt
         |                      ^~~
   net/dsa/port.c:165:4: note: in expansion of macro 'dev_err'
     165 |    dev_err(dp->ds->dev,
         |    ^~~~~~~
   net/dsa/port.c:166:40: note: format string is defined here
     166 |     "failed to clear bridge port flag %d: %d (%pe)\n",
         |                                       ~^
         |                                        |
         |                                        int
         |                                       %ld


vim +166 net/dsa/port.c

   148	
   149	static void dsa_port_clear_brport_flags(struct dsa_port *dp,
   150						struct netlink_ext_ack *extack)
   151	{
   152		const unsigned long val = BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
   153		const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
   154					   BR_BCAST_FLOOD;
   155		int flag, err;
   156	
   157		for_each_set_bit(flag, &mask, 32) {
   158			struct switchdev_brport_flags flags = {0};
   159	
   160			flags.mask = BIT(flag);
   161			flags.val = val & BIT(flag);
   162	
   163			err = dsa_port_bridge_flags(dp, flags, extack);
   164			if (err && err != -EOPNOTSUPP)
   165				dev_err(dp->ds->dev,
 > 166					"failed to clear bridge port flag %d: %d (%pe)\n",
   167					flags.val, err, ERR_PTR(err));
   168		}
   169	}
   170	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/net/dsa/port.c b/net/dsa/port.c
index fcbe5b1545b8..8dbc6e0db30c 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -122,26 +122,82 @@  void dsa_port_disable(struct dsa_port *dp)
 	rtnl_unlock();
 }
 
-static void dsa_port_change_brport_flags(struct dsa_port *dp,
-					 bool bridge_offload)
+static int dsa_port_inherit_brport_flags(struct dsa_port *dp,
+					 struct netlink_ext_ack *extack)
 {
-	struct switchdev_brport_flags flags;
-	int flag;
+	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
+				   BR_BCAST_FLOOD;
+	struct net_device *brport_dev = dsa_port_to_bridge_port(dp);
+	int flag, err;
 
-	flags.mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
-	if (bridge_offload)
-		flags.val = flags.mask;
-	else
-		flags.val = flags.mask & ~BR_LEARNING;
+	for_each_set_bit(flag, &mask, 32) {
+		struct switchdev_brport_flags flags = {0};
 
-	for_each_set_bit(flag, &flags.mask, 32) {
-		struct switchdev_brport_flags tmp;
+		flags.mask = BIT(flag);
 
-		tmp.val = flags.val & BIT(flag);
-		tmp.mask = BIT(flag);
+		if (br_port_flag_is_set(brport_dev, BIT(flag)))
+			flags.val = BIT(flag);
 
-		dsa_port_bridge_flags(dp, tmp, NULL);
+		err = dsa_port_bridge_flags(dp, flags, extack);
+		if (err && err != -EOPNOTSUPP)
+			return err;
 	}
+
+	return 0;
+}
+
+static void dsa_port_clear_brport_flags(struct dsa_port *dp,
+					struct netlink_ext_ack *extack)
+{
+	const unsigned long val = BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD;
+	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
+				   BR_BCAST_FLOOD;
+	int flag, err;
+
+	for_each_set_bit(flag, &mask, 32) {
+		struct switchdev_brport_flags flags = {0};
+
+		flags.mask = BIT(flag);
+		flags.val = val & BIT(flag);
+
+		err = dsa_port_bridge_flags(dp, flags, extack);
+		if (err && err != -EOPNOTSUPP)
+			dev_err(dp->ds->dev,
+				"failed to clear bridge port flag %d: %d (%pe)\n",
+				flags.val, err, ERR_PTR(err));
+	}
+}
+
+static int dsa_port_switchdev_sync(struct dsa_port *dp,
+				   struct netlink_ext_ack *extack)
+{
+	int err;
+
+	err = dsa_port_inherit_brport_flags(dp, extack);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+/* Configure the port for standalone mode (no address learning, flood
+ * everything, BR_STATE_FORWARDING, etc).
+ * The bridge only emits SWITCHDEV_ATTR_ID_PORT_* events when the user
+ * requests it through netlink or sysfs, but not automatically at port
+ * join or leave, so we need to handle resetting the brport flags ourselves.
+ * But we even prefer it that way, because otherwise, some setups might never
+ * get the notification they need, for example, when a port leaves a LAG that
+ * offloads the bridge, it becomes standalone, but as far as the bridge is
+ * concerned, no port ever left.
+ */
+static void dsa_port_switchdev_unsync(struct dsa_port *dp)
+{
+	dsa_port_clear_brport_flags(dp, NULL);
+
+	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
+	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
+	 */
+	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 }
 
 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
@@ -155,24 +211,25 @@  int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
 	};
 	int err;
 
-	/* Notify the port driver to set its configurable flags in a way that
-	 * matches the initial settings of a bridge port.
-	 */
-	dsa_port_change_brport_flags(dp, true);
-
 	/* Here the interface is already bridged. Reflect the current
 	 * configuration so that drivers can program their chips accordingly.
 	 */
 	dp->bridge_dev = br;
 
 	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
+	if (err)
+		goto out_rollback;
 
-	/* The bridging is rolled back on error */
-	if (err) {
-		dsa_port_change_brport_flags(dp, false);
-		dp->bridge_dev = NULL;
-	}
+	err = dsa_port_switchdev_sync(dp, extack);
+	if (err)
+		goto out_rollback_unbridge;
 
+	return 0;
+
+out_rollback_unbridge:
+	dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
+out_rollback:
+	dp->bridge_dev = NULL;
 	return err;
 }
 
@@ -186,6 +243,8 @@  void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 	};
 	int err;
 
+	dsa_port_switchdev_unsync(dp);
+
 	/* Here the port is already unbridged. Reflect the current configuration
 	 * so that drivers can program their chips accordingly.
 	 */
@@ -194,24 +253,6 @@  void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 	if (err)
 		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
-
-	/* Configure the port for standalone mode (no address learning,
-	 * flood everything).
-	 * The bridge only emits SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS events
-	 * when the user requests it through netlink or sysfs, but not
-	 * automatically at port join or leave, so we need to handle resetting
-	 * the brport flags ourselves. But we even prefer it that way, because
-	 * otherwise, some setups might never get the notification they need,
-	 * for example, when a port leaves a LAG that offloads the bridge,
-	 * it becomes standalone, but as far as the bridge is concerned, no
-	 * port ever left.
-	 */
-	dsa_port_change_brport_flags(dp, false);
-
-	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
-	 * so allow it to be in BR_STATE_FORWARDING to be kept functional
-	 */
-	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 }
 
 int dsa_port_lag_change(struct dsa_port *dp,