swdevice: add new apis to set and del bridge port attributes

This patch adds two new api's netdev_switch_port_bridge_setlink
and netdev_switch_port_bridge_dellink to offload bridge port attributes
to switch port

(The names of the apis look odd with 'switch_port_bridge',
but am more inclined to change the prefix of the api to something else.
Will take any suggestions).

The api's look at the NETIF_F_HW_SWITCH_OFFLOAD feature flag to
pass bridge port attributes to the port device.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 146 insertions, 1 deletions

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 205e63698da9..cfcdac2e5d25 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -43,7 +43,14 @@ int register_netdev_switch_notifier(struct notifier_block *nb);
 int unregister_netdev_switch_notifier(struct notifier_block *nb);
 int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
                                  struct netdev_switch_notifier_info *info);
-
+int netdev_switch_port_bridge_setlink(struct net_device *dev,
+                                struct nlmsghdr *nlh, u16 flags);
+int netdev_switch_port_bridge_dellink(struct net_device *dev,
+                                struct nlmsghdr *nlh, u16 flags);
+int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
+                                               struct nlmsghdr *nlh, u16 flags);
+int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
+                                               struct nlmsghdr *nlh, u16 flags);
 #else
 
 static inline int netdev_switch_parent_id_get(struct net_device *dev,
@@ -74,6 +81,34 @@ static inline int call_netdev_switch_notifiers(unsigned long val, struct net_dev
         return NOTIFY_DONE;
 }
 
+static inline int netdev_switch_port_bridge_setlink(struct net_device *dev,
+                                                    struct nlmsghdr *nlh,
+                                                    u16 flags)
+{
+        return -EOPNOTSUPP;
+}
+
+static inline int netdev_switch_port_bridge_dellink(struct net_device *dev,
+                                                    struct nlmsghdr *nlh,
+                                                    u16 flags)
+{
+        return -EOPNOTSUPP;
+}
+
+static inline int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
+                                                        struct nlmsghdr *nlh,
+                                                        u16 flags)
+{
+        return 0;
+}
+
+static inline int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
+                                                        struct nlmsghdr *nlh,
+                                                        u16 flags)
+{
+        return 0;
+}
+
 #endif
 
 #endif /* _LINUX_SWITCHDEV_H_ */
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 22e02f4edd99..8c1e558db118 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -115,3 +115,113 @@ int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev,
         return err;
 }
 EXPORT_SYMBOL(call_netdev_switch_notifiers);
+
+/**
+ *      netdev_switch_port_bridge_setlink - Notify switch device port of bridge
+ *      port attributes
+ *
+ *      @dev: port device
+ *      @nlh: netlink msg with bridge port attributes
+ *      @flags: bridge setlink flags
+ *
+ *      Notify switch device port of bridge port attributes
+ */
+int netdev_switch_port_bridge_setlink(struct net_device *dev,
+                                      struct nlmsghdr *nlh, u16 flags)
+{
+        const struct net_device_ops *ops = dev->netdev_ops;
+
+        if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
+                return 0;
+
+        if (!ops->ndo_bridge_setlink)
+                return -EOPNOTSUPP;
+
+        return ops->ndo_bridge_setlink(dev, nlh, flags);
+}
+EXPORT_SYMBOL(netdev_switch_port_bridge_setlink);
+
+/**
+ *      netdev_switch_port_bridge_dellink - Notify switch device port of bridge
+ *      port attribute delete
+ *
+ *      @dev: port device
+ *      @nlh: netlink msg with bridge port attributes
+ *      @flags: bridge setlink flags
+ *
+ *      Notify switch device port of bridge port attribute delete
+ */
+int netdev_switch_port_bridge_dellink(struct net_device *dev,
+                                      struct nlmsghdr *nlh, u16 flags)
+{
+        const struct net_device_ops *ops = dev->netdev_ops;
+
+        if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
+                return 0;
+
+        if (!ops->ndo_bridge_dellink)
+                return -EOPNOTSUPP;
+
+        return ops->ndo_bridge_dellink(dev, nlh, flags);
+}
+EXPORT_SYMBOL(netdev_switch_port_bridge_dellink);
+
+/**
+ *      ndo_dflt_netdev_switch_port_bridge_setlink - default ndo bridge setlink
+ *                                                   op for master devices
+ *
+ *      @dev: port device
+ *      @nlh: netlink msg with bridge port attributes
+ *      @flags: bridge setlink flags
+ *
+ *      Notify master device slaves of bridge port attributes
+ */
+int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
+                                               struct nlmsghdr *nlh, u16 flags)
+{
+        struct net_device *lower_dev;
+        struct list_head *iter;
+        int ret = 0, err = 0;
+
+        if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
+                return ret;
+
+        netdev_for_each_lower_dev(dev, lower_dev, iter) {
+                err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags);
+                if (err && err != -EOPNOTSUPP)
+                        ret = err;
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL(ndo_dflt_netdev_switch_port_bridge_setlink);
+
+/**
+ *      ndo_dflt_netdev_switch_port_bridge_dellink - default ndo bridge dellink
+ *                                                   op for master devices
+ *
+ *      @dev: port device
+ *      @nlh: netlink msg with bridge port attributes
+ *      @flags: bridge dellink flags
+ *
+ *      Notify master device slaves of bridge port attribute deletes
+ */
+int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
+                                               struct nlmsghdr *nlh, u16 flags)
+{
+        struct net_device *lower_dev;
+        struct list_head *iter;
+        int ret = 0, err = 0;
+
+        if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
+                return ret;
+
+        netdev_for_each_lower_dev(dev, lower_dev, iter) {
+                err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags);
+                if (err && err != -EOPNOTSUPP)
+                        ret = err;
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL(ndo_dflt_netdev_switch_port_bridge_dellink);