From 8557b458e204e9a290e7475a98c4293ba9ad4131 Mon Sep 17 00:00:00 2001
From: Birger Koblitz <git@birger-koblitz.de>
Date: Tue, 18 Jan 2022 17:16:48 +0100
Subject: [PATCH] realtek: Backport LAG functionality for DSA
Add the LAG configuration API for DSA as found in Linux 5.12 so that we
can implement it in the dsa driver.
Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Birger Koblitz <git@birger-koblitz.de>
---
.../patches-5.10/709-lag-offloading.patch | 759 ++++++++++++++++++
1 file changed, 759 insertions(+)
create mode 100644 target/linux/realtek/patches-5.10/709-lag-offloading.patch
diff --git a/target/linux/realtek/patches-5.10/709-lag-offloading.patch b/target/linux/realtek/patches-5.10/709-lag-offloading.patch
new file mode 100644
index 00000000000..792ec73e509
--- /dev/null
+++ b/target/linux/realtek/patches-5.10/709-lag-offloading.patch
@@ -0,0 +1,759 @@
+--- a/drivers/net/bonding/bond_main.c
++++ b/drivers/net/bonding/bond_main.c
+@@ -2046,6 +2046,8 @@ int bond_enslave(struct net_device *bond
+ goto err_unregister;
+ }
+
++ bond_lower_state_changed(new_slave);
++
+ res = bond_sysfs_slave_add(new_slave);
+ if (res) {
+ slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
+--- a/include/net/dsa.h
++++ b/include/net/dsa.h
+@@ -149,8 +149,41 @@ struct dsa_switch_tree {
+
+ /* List of DSA links composing the routing table */
+ struct list_head rtable;
++
++ /* Maps offloaded LAG netdevs to a zero-based linear ID for
++ * drivers that need it.
++ */
++ struct net_device **lags;
++ unsigned int lags_len;
+ };
+
++#define dsa_lags_foreach_id(_id, _dst) \
++ for ((_id) = 0; (_id) < (_dst)->lags_len; (_id)++) \
++ if ((_dst)->lags[(_id)])
++
++#define dsa_lag_foreach_port(_dp, _dst, _lag) \
++ list_for_each_entry((_dp), &(_dst)->ports, list) \
++ if ((_dp)->lag_dev == (_lag))
++
++static inline struct net_device *dsa_lag_dev(struct dsa_switch_tree *dst,
++ unsigned int id)
++{
++ return dst->lags[id];
++}
++
++static inline int dsa_lag_id(struct dsa_switch_tree *dst,
++ struct net_device *lag)
++{
++ unsigned int id;
++
++ dsa_lags_foreach_id(id, dst) {
++ if (dsa_lag_dev(dst, id) == lag)
++ return id;
++ }
++
++ return -ENODEV;
++}
++
+ /* TC matchall action types */
+ enum dsa_port_mall_action_type {
+ DSA_PORT_MALL_MIRROR,
+@@ -220,6 +253,8 @@ struct dsa_port {
+ bool devlink_port_setup;
+ struct phylink *pl;
+ struct phylink_config pl_config;
++ struct net_device *lag_dev;
++ bool lag_tx_enabled;
+
+ struct list_head list;
+
+@@ -340,6 +375,14 @@ struct dsa_switch {
+ */
+ bool mtu_enforcement_ingress;
+
++ /* Drivers that benefit from having an ID associated with each
++ * offloaded LAG should set this to the maximum number of
++ * supported IDs. DSA will then maintain a mapping of _at
++ * least_ these many IDs, accessible to drivers via
++ * dsa_lag_id().
++ */
++ unsigned int num_lag_ids;
++
+ size_t num_ports;
+ };
+
+@@ -432,6 +475,18 @@ static inline bool dsa_port_is_vlan_filt
+ return dp->vlan_filtering;
+ }
+
++static inline
++struct net_device *dsa_port_to_bridge_port(const struct dsa_port *dp)
++{
++ if (!dp->bridge_dev)
++ return NULL;
++
++ if (dp->lag_dev)
++ return dp->lag_dev;
++
++ return dp->slave;
++}
++
+ typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
+ bool is_static, void *data);
+ struct dsa_switch_ops {
+@@ -629,6 +684,13 @@ struct dsa_switch_ops {
+ void (*crosschip_bridge_leave)(struct dsa_switch *ds, int tree_index,
+ int sw_index, int port,
+ struct net_device *br);
++ int (*crosschip_lag_change)(struct dsa_switch *ds, int sw_index,
++ int port);
++ int (*crosschip_lag_join)(struct dsa_switch *ds, int sw_index,
++ int port, struct net_device *lag,
++ struct netdev_lag_upper_info *info);
++ int (*crosschip_lag_leave)(struct dsa_switch *ds, int sw_index,
++ int port, struct net_device *lag);
+
+ /*
+ * PTP functionality
+@@ -660,6 +722,16 @@ struct dsa_switch_ops {
+ int (*port_change_mtu)(struct dsa_switch *ds, int port,
+ int new_mtu);
+ int (*port_max_mtu)(struct dsa_switch *ds, int port);
++
++ /*
++ * LAG integration
++ */
++ int (*port_lag_change)(struct dsa_switch *ds, int port);
++ int (*port_lag_join)(struct dsa_switch *ds, int port,
++ struct net_device *lag,
++ struct netdev_lag_upper_info *info);
++ int (*port_lag_leave)(struct dsa_switch *ds, int port,
++ struct net_device *lag);
+ };
+
+ #define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes) \
+--- a/net/dsa/dsa.c
++++ b/net/dsa/dsa.c
+@@ -220,11 +220,21 @@ static int dsa_switch_rcv(struct sk_buff
+ }
+
+ skb = nskb;
+- p = netdev_priv(skb->dev);
+ skb_push(skb, ETH_HLEN);
+ skb->pkt_type = PACKET_HOST;
+ skb->protocol = eth_type_trans(skb, skb->dev);
+
++ if (unlikely(!dsa_slave_dev_check(skb->dev))) {
++ /* Packet is to be injected directly on an upper
++ * device, e.g. a team/bond, so skip all DSA-port
++ * specific actions.
++ */
++ netif_rx(skb);
++ return 0;
++ }
++
++ p = netdev_priv(skb->dev);
++
+ if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
+ nskb = dsa_untag_bridge_pvid(skb);
+ if (!nskb) {
+--- a/net/dsa/dsa2.c
++++ b/net/dsa/dsa2.c
+@@ -21,6 +21,65 @@
+ static DEFINE_MUTEX(dsa2_mutex);
+ LIST_HEAD(dsa_tree_list);
+
++/**
++ * dsa_lag_map() - Map LAG netdev to a linear LAG ID
++ * @dst: Tree in which to record the mapping.
++ * @lag: Netdev that is to be mapped to an ID.
++ *
++ * dsa_lag_id/dsa_lag_dev can then be used to translate between the
++ * two spaces. The size of the mapping space is determined by the
++ * driver by setting ds->num_lag_ids. It is perfectly legal to leave
++ * it unset if it is not needed, in which case these functions become
++ * no-ops.
++ */
++void dsa_lag_map(struct dsa_switch_tree *dst, struct net_device *lag)
++{
++ unsigned int id;
++
++ if (dsa_lag_id(dst, lag) >= 0)
++ /* Already mapped */
++ return;
++
++ for (id = 0; id < dst->lags_len; id++) {
++ if (!dsa_lag_dev(dst, id)) {
++ dst->lags[id] = lag;
++ return;
++ }
++ }
++
++ /* No IDs left, which is OK. Some drivers do not need it. The
++ * ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id
++ * returns an error for this device when joining the LAG. The
++ * driver can then return -EOPNOTSUPP back to DSA, which will
++ * fall back to a software LAG.
++ */
++}
++
++/**
++ * dsa_lag_unmap() - Remove a LAG ID mapping
++ * @dst: Tree in which the mapping is recorded.
++ * @lag: Netdev that was mapped.
++ *
++ * As there may be multiple users of the mapping, it is only removed
++ * if there are no other references to it.
++ */
++void dsa_lag_unmap(struct dsa_switch_tree *dst, struct net_device *lag)
++{
++ struct dsa_port *dp;
++ unsigned int id;
++
++ dsa_lag_foreach_port(dp, dst, lag)
++ /* There are remaining users of this mapping */
++ return;
++
++ dsa_lags_foreach_id(id, dst) {
++ if (dsa_lag_dev(dst, id) == lag) {
++ dst->lags[id] = NULL;
++ break;
++ }
++ }
++}
++
+ struct dsa_switch *dsa_switch_find(int tree_index, int sw_index)
+ {
+ struct dsa_switch_tree *dst;
+@@ -597,6 +656,32 @@ static void dsa_tree_teardown_master(str
+ dsa_master_teardown(dp->master);
+ }
+
++static int dsa_tree_setup_lags(struct dsa_switch_tree *dst)
++{
++ unsigned int len = 0;
++ struct dsa_port *dp;
++
++ list_for_each_entry(dp, &dst->ports, list) {
++ if (dp->ds->num_lag_ids > len)
++ len = dp->ds->num_lag_ids;
++ }
++
++ if (!len)
++ return 0;
++
++ dst->lags = kcalloc(len, sizeof(*dst->lags), GFP_KERNEL);
++ if (!dst->lags)
++ return -ENOMEM;
++
++ dst->lags_len = len;
++ return 0;
++}
++
++static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst)
++{
++ kfree(dst->lags);
++}
++
+ static int dsa_tree_setup(struct dsa_switch_tree *dst)
+ {
+ bool complete;
+@@ -624,12 +709,18 @@ static int dsa_tree_setup(struct dsa_swi
+ if (err)
+ goto teardown_switches;
+
++ err = dsa_tree_setup_lags(dst);
++ if (err)
++ goto teardown_master;
++
+ dst->setup = true;
+
+ pr_info("DSA: tree %d setup\n", dst->index);
+
+ return 0;
+
++teardown_master:
++ dsa_tree_teardown_master(dst);
+ teardown_switches:
+ dsa_tree_teardown_switches(dst);
+ teardown_default_cpu:
+@@ -645,6 +736,8 @@ static void dsa_tree_teardown(struct dsa
+ if (!dst->setup)
+ return;
+
++ dsa_tree_teardown_lags(dst);
++
+ dsa_tree_teardown_master(dst);
+
+ dsa_tree_teardown_switches(dst);
+--- a/net/dsa/dsa_priv.h
++++ b/net/dsa/dsa_priv.h
+@@ -20,6 +20,9 @@ enum {
+ DSA_NOTIFIER_BRIDGE_LEAVE,
+ DSA_NOTIFIER_FDB_ADD,
+ DSA_NOTIFIER_FDB_DEL,
++ DSA_NOTIFIER_LAG_CHANGE,
++ DSA_NOTIFIER_LAG_JOIN,
++ DSA_NOTIFIER_LAG_LEAVE,
+ DSA_NOTIFIER_MDB_ADD,
+ DSA_NOTIFIER_MDB_DEL,
+ DSA_NOTIFIER_VLAN_ADD,
+@@ -57,6 +60,15 @@ struct dsa_notifier_mdb_info {
+ int port;
+ };
+
++/* DSA_NOTIFIER_LAG_* */
++struct dsa_notifier_lag_info {
++ struct net_device *lag;
++ int sw_index;
++ int port;
++
++ struct netdev_lag_upper_info *info;
++};
++
+ /* DSA_NOTIFIER_VLAN_* */
+ struct dsa_notifier_vlan_info {
+ const struct switchdev_obj_port_vlan *vlan;
+@@ -149,6 +161,11 @@ void dsa_port_disable_rt(struct dsa_port
+ void dsa_port_disable(struct dsa_port *dp);
+ int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br);
+ void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br);
++int dsa_port_lag_change(struct dsa_port *dp,
++ struct netdev_lag_lower_state_info *linfo);
++int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag_dev,
++ struct netdev_lag_upper_info *uinfo);
++void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag_dev);
+ int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
+ struct switchdev_trans *trans);
+ bool dsa_port_skip_vlan_configuration(struct dsa_port *dp);
+@@ -181,6 +198,71 @@ int dsa_port_link_register_of(struct dsa
+ void dsa_port_link_unregister_of(struct dsa_port *dp);
+ extern const struct phylink_mac_ops dsa_port_phylink_mac_ops;
+
++static inline bool dsa_port_offloads_netdev(struct dsa_port *dp,
++ struct net_device *dev)
++{
++ /* Switchdev offloading can be configured on: */
++
++ if (dev == dp->slave)
++ /* DSA ports directly connected to a bridge, and event
++ * was emitted for the ports themselves.
++ */
++ return true;
++
++ if (dp->bridge_dev == dev)
++ /* DSA ports connected to a bridge, and event was emitted
++ * for the bridge.
++ */
++ return true;
++
++ if (dp->lag_dev == dev)
++ /* DSA ports connected to a bridge via a LAG */
++ return true;
++
++ return false;
++}
++
++static inline bool dsa_port_offloads_bridge_port(struct dsa_port *dp,
++ struct net_device *dev)
++{
++ return dsa_port_to_bridge_port(dp) == dev;
++}
++
++static inline bool dsa_port_offloads_bridge(struct dsa_port *dp,
++ struct net_device *bridge_dev)
++{
++ /* DSA ports connected to a bridge, and event was emitted
++ * for the bridge.
++ */
++ return dp->bridge_dev == bridge_dev;
++}
++
++/* Returns true if any port of this tree offloads the given net_device */
++static inline bool dsa_tree_offloads_bridge_port(struct dsa_switch_tree *dst,
++ struct net_device *dev)
++{
++ struct dsa_port *dp;
++
++ list_for_each_entry(dp, &dst->ports, list)
++ if (dsa_port_offloads_bridge_port(dp, dev))
++ return true;
++
++ return false;
++}
++
++/* Returns true if any port of this tree offloads the given net_device */
++static inline bool dsa_tree_offloads_netdev(struct dsa_switch_tree *dst,
++ struct net_device *dev)
++{
++ struct dsa_port *dp;
++
++ list_for_each_entry(dp, &dst->ports, list)
++ if (dsa_port_offloads_netdev(dp, dev))
++ return true;
++
++ return false;
++}
++
+ /* slave.c */
+ extern const struct dsa_device_ops notag_netdev_ops;
+ void dsa_slave_mii_bus_init(struct dsa_switch *ds);
+@@ -285,6 +367,9 @@ int dsa_switch_register_notifier(struct
+ void dsa_switch_unregister_notifier(struct dsa_switch *ds);
+
+ /* dsa2.c */
++void dsa_lag_map(struct dsa_switch_tree *dst, struct net_device *lag);
++void dsa_lag_unmap(struct dsa_switch_tree *dst, struct net_device *lag);
++
+ extern struct list_head dsa_tree_list;
+
+ #endif
+--- a/net/dsa/port.c
++++ b/net/dsa/port.c
+@@ -193,6 +193,99 @@ void dsa_port_bridge_leave(struct dsa_po
+ dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
+ }
+
++int dsa_port_lag_change(struct dsa_port *dp,
++ struct netdev_lag_lower_state_info *linfo)
++{
++ struct dsa_notifier_lag_info info = {
++ .sw_index = dp->ds->index,
++ .port = dp->index,
++ };
++ bool tx_enabled;
++
++ if (!dp->lag_dev)
++ return 0;
++
++ /* On statically configured aggregates (e.g. loadbalance
++ * without LACP) ports will always be tx_enabled, even if the
++ * link is down. Thus we require both link_up and tx_enabled
++ * in order to include it in the tx set.
++ */
++ tx_enabled = linfo->link_up && linfo->tx_enabled;
++
++ if (tx_enabled == dp->lag_tx_enabled)
++ return 0;
++
++ dp->lag_tx_enabled = tx_enabled;
++
++ return dsa_port_notify(dp, DSA_NOTIFIER_LAG_CHANGE, &info);
++}
++
++int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag,
++ struct netdev_lag_upper_info *uinfo)
++{
++ struct dsa_notifier_lag_info info = {
++ .sw_index = dp->ds->index,
++ .port = dp->index,
++ .lag = lag,
++ .info = uinfo,
++ };
++ struct net_device *bridge_dev;
++ int err;
++
++ dsa_lag_map(dp->ds->dst, lag);
++ dp->lag_dev = lag;
++
++ err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_JOIN, &info);
++ if (err)
++ goto err_lag_join;
++
++ bridge_dev = netdev_master_upper_dev_get(lag);
++ if (!bridge_dev || !netif_is_bridge_master(bridge_dev))
++ return 0;
++
++ err = dsa_port_bridge_join(dp, bridge_dev);
++ if (err)
++ goto err_bridge_join;
++
++ return 0;
++
++err_bridge_join:
++ dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
++err_lag_join:
++ dp->lag_dev = NULL;
++ dsa_lag_unmap(dp->ds->dst, lag);
++ return err;
++}
++
++void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag)
++{
++ struct dsa_notifier_lag_info info = {
++ .sw_index = dp->ds->index,
++ .port = dp->index,
++ .lag = lag,
++ };
++ int err;
++
++ if (!dp->lag_dev)
++ return;
++
++ /* Port might have been part of a LAG that in turn was
++ * attached to a bridge.
++ */
++ if (dp->bridge_dev)
++ dsa_port_bridge_leave(dp, dp->bridge_dev);
++
++ dp->lag_tx_enabled = false;
++ dp->lag_dev = NULL;
++
++ err = dsa_port_notify(dp, DSA_NOTIFIER_LAG_LEAVE, &info);
++ if (err)
++ pr_err("DSA: failed to notify DSA_NOTIFIER_LAG_LEAVE: %d\n",
++ err);
++
++ dsa_lag_unmap(dp->ds->dst, lag);
++}
++
+ /* Must be called under rcu_read_lock() */
+ static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
+ bool vlan_filtering)
+--- a/net/dsa/slave.c
++++ b/net/dsa/slave.c
+@@ -337,9 +337,6 @@ static int dsa_slave_vlan_add(struct net
+ struct switchdev_obj_port_vlan vlan;
+ int vid, err;
+
+- if (obj->orig_dev != dev)
+- return -EOPNOTSUPP;
+-
+ if (dsa_port_skip_vlan_configuration(dp))
+ return 0;
+
+@@ -394,11 +391,13 @@ static int dsa_slave_port_obj_add(struct
+
+ switch (obj->id) {
+ case SWITCHDEV_OBJ_ID_PORT_MDB:
+- if (obj->orig_dev != dev)
++ if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
+ return -EOPNOTSUPP;
+ err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
+ break;
+ case SWITCHDEV_OBJ_ID_HOST_MDB:
++ if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
++ return -EOPNOTSUPP;
+ /* DSA can directly translate this to a normal MDB add,
+ * but on the CPU port.
+ */
+@@ -406,6 +405,9 @@ static int dsa_slave_port_obj_add(struct
+ trans);
+ break;
+ case SWITCHDEV_OBJ_ID_PORT_VLAN:
++ if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
++ return -EOPNOTSUPP;
++
+ err = dsa_slave_vlan_add(dev, obj, trans);
+ break;
+ default:
+@@ -424,9 +426,6 @@ static int dsa_slave_vlan_del(struct net
+ struct switchdev_obj_port_vlan *vlan;
+ int vid, err;
+
+- if (obj->orig_dev != dev)
+- return -EOPNOTSUPP;
+-
+ if (dsa_port_skip_vlan_configuration(dp))
+ return 0;
+
+@@ -453,17 +452,22 @@ static int dsa_slave_port_obj_del(struct
+
+ switch (obj->id) {
+ case SWITCHDEV_OBJ_ID_PORT_MDB:
+- if (obj->orig_dev != dev)
++ if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
+ return -EOPNOTSUPP;
+ err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
+ break;
+ case SWITCHDEV_OBJ_ID_HOST_MDB:
++ if (!dsa_port_offloads_bridge(dp, obj->orig_dev))
++ return -EOPNOTSUPP;
+ /* DSA can directly translate this to a normal MDB add,
+ * but on the CPU port.
+ */
+ err = dsa_port_mdb_del(dp->cpu_dp, SWITCHDEV_OBJ_PORT_MDB(obj));
+ break;
+ case SWITCHDEV_OBJ_ID_PORT_VLAN:
++ if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
++ return -EOPNOTSUPP;
++
+ err = dsa_slave_vlan_del(dev, obj);
+ break;
+ default:
+@@ -1993,6 +1997,46 @@ static int dsa_slave_changeupper(struct
+ dsa_port_bridge_leave(dp, info->upper_dev);
+ err = NOTIFY_OK;
+ }
++ } else if (netif_is_lag_master(info->upper_dev)) {
++ if (info->linking) {
++ err = dsa_port_lag_join(dp, info->upper_dev,
++ info->upper_info);
++ if (err == -EOPNOTSUPP) {
++ NL_SET_ERR_MSG_MOD(info->info.extack,
++ "Offloading not supported");
++ err = 0;
++ }
++ err = notifier_from_errno(err);
++ } else {
++ dsa_port_lag_leave(dp, info->upper_dev);
++ err = NOTIFY_OK;
++ }
++ }
++
++ return err;
++}
++
++static int
++dsa_slave_lag_changeupper(struct net_device *dev,
++ struct netdev_notifier_changeupper_info *info)
++{
++ struct net_device *lower;
++ struct list_head *iter;
++ int err = NOTIFY_DONE;
++ struct dsa_port *dp;
++
++ netdev_for_each_lower_dev(dev, lower, iter) {
++ if (!dsa_slave_dev_check(lower))
++ continue;
++
++ dp = dsa_slave_to_port(lower);
++ if (!dp->lag_dev)
++ /* Software LAG */
++ continue;
++
++ err = dsa_slave_changeupper(lower, info);
++ if (notifier_to_errno(err))
++ break;
+ }
+
+ return err;
+@@ -2078,10 +2122,26 @@ static int dsa_slave_netdevice_event(str
+ break;
+ }
+ case NETDEV_CHANGEUPPER:
++ if (dsa_slave_dev_check(dev))
++ return dsa_slave_changeupper(dev, ptr);
++
++ if (netif_is_lag_master(dev))
++ return dsa_slave_lag_changeupper(dev, ptr);
++
++ break;
++ case NETDEV_CHANGELOWERSTATE: {
++ struct netdev_notifier_changelowerstate_info *info = ptr;
++ struct dsa_port *dp;
++ int err;
++
+ if (!dsa_slave_dev_check(dev))
+- return NOTIFY_DONE;
++ break;
+
+- return dsa_slave_changeupper(dev, ptr);
++ dp = dsa_slave_to_port(dev);
++
++ err = dsa_port_lag_change(dp, info->lower_state_info);
++ return notifier_from_errno(err);
++ }
+ }
+
+ return NOTIFY_DONE;
+@@ -2229,6 +2289,15 @@ static int dsa_slave_switchdev_event(str
+ if (!fdb_info->added_by_user &&
+ !dp->ds->assisted_learning_on_cpu_port)
+ return NOTIFY_DONE;
++
++ /* When the bridge learns an address on an offloaded
++ * LAG we don't want to send traffic to the CPU, the
++ * other ports bridged with the LAG should be able to
++ * autonomously forward towards it.
++ */
++ if (dsa_tree_offloads_netdev(dp->ds->dst, dev))
++ return NOTIFY_DONE;
++
+ }
+
+ if (!dp->ds->ops->port_fdb_add || !dp->ds->ops->port_fdb_del)
+--- a/net/dsa/switch.c
++++ b/net/dsa/switch.c
+@@ -178,6 +178,47 @@ static int dsa_switch_fdb_del(struct dsa
+ return ds->ops->port_fdb_del(ds, port, info->addr, info->vid);
+ }
+
++static int dsa_switch_lag_change(struct dsa_switch *ds,
++ struct dsa_notifier_lag_info *info)
++{
++ if (ds->index == info->sw_index && ds->ops->port_lag_change)
++ return ds->ops->port_lag_change(ds, info->port);
++
++ if (ds->index != info->sw_index && ds->ops->crosschip_lag_change)
++ return ds->ops->crosschip_lag_change(ds, info->sw_index,
++ info->port);
++
++ return 0;
++}
++
++static int dsa_switch_lag_join(struct dsa_switch *ds,
++ struct dsa_notifier_lag_info *info)
++{
++ if (ds->index == info->sw_index && ds->ops->port_lag_join)
++ return ds->ops->port_lag_join(ds, info->port, info->lag,
++ info->info);
++
++ if (ds->index != info->sw_index && ds->ops->crosschip_lag_join)
++ return ds->ops->crosschip_lag_join(ds, info->sw_index,
++ info->port, info->lag,
++ info->info);
++
++ return -EOPNOTSUPP;
++}
++
++static int dsa_switch_lag_leave(struct dsa_switch *ds,
++ struct dsa_notifier_lag_info *info)
++{
++ if (ds->index == info->sw_index && ds->ops->port_lag_leave)
++ return ds->ops->port_lag_leave(ds, info->port, info->lag);
++
++ if (ds->index != info->sw_index && ds->ops->crosschip_lag_leave)
++ return ds->ops->crosschip_lag_leave(ds, info->sw_index,
++ info->port, info->lag);
++
++ return -EOPNOTSUPP;
++}
++
+ static bool dsa_switch_mdb_match(struct dsa_switch *ds, int port,
+ struct dsa_notifier_mdb_info *info)
+ {
+@@ -325,6 +366,15 @@ static int dsa_switch_event(struct notif
+ case DSA_NOTIFIER_FDB_DEL:
+ err = dsa_switch_fdb_del(ds, info);
+ break;
++ case DSA_NOTIFIER_LAG_CHANGE:
++ err = dsa_switch_lag_change(ds, info);
++ break;
++ case DSA_NOTIFIER_LAG_JOIN:
++ err = dsa_switch_lag_join(ds, info);
++ break;
++ case DSA_NOTIFIER_LAG_LEAVE:
++ err = dsa_switch_lag_leave(ds, info);
++ break;
+ case DSA_NOTIFIER_MDB_ADD:
+ err = dsa_switch_mdb_add(ds, info);
+ break;
+--- a/net/dsa/tag_dsa.c
++++ b/net/dsa/tag_dsa.c
+@@ -82,7 +82,19 @@ static struct sk_buff *dsa_rcv(struct sk
+ source_device = dsa_header[0] & 0x1f;
+ source_port = (dsa_header[1] >> 3) & 0x1f;
+
+- skb->dev = dsa_master_find_slave(dev, source_device, source_port);
++ if (trunk) {
++ struct dsa_port *cpu_dp = dev->dsa_ptr;
++
++ /* The exact source port is not available in the tag,
++ * so we inject the frame directly on the upper
++ * team/bond.
++ */
++ skb->dev = dsa_lag_dev(cpu_dp->dst, source_port);
++ } else {
++ skb->dev = dsa_master_find_slave(dev, source_device,
++ source_port);
++ }
++
+ if (!skb->dev)
+ return NULL;
+
--
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