1 files changed, 96 insertions, 2 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 81c4c0274b9b..99907d829419 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -227,6 +227,65 @@ int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
 }
 EXPORT_SYMBOL(ndo_dflt_netdev_switch_port_bridge_dellink);
 
+static struct net_device *netdev_switch_get_lowest_dev(struct net_device *dev)
+{
+        const struct net_device_ops *ops = dev->netdev_ops;
+        struct net_device *lower_dev;
+        struct net_device *port_dev;
+        struct list_head *iter;
+
+        /* Recusively search down until we find a sw port dev.
+         * (A sw port dev supports ndo_switch_parent_id_get).
+         */
+
+        if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD &&
+            ops->ndo_switch_parent_id_get)
+                return dev;
+
+        netdev_for_each_lower_dev(dev, lower_dev, iter) {
+                port_dev = netdev_switch_get_lowest_dev(lower_dev);
+                if (port_dev)
+                        return port_dev;
+        }
+
+        return NULL;
+}
+
+static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi)
+{
+        struct netdev_phys_item_id psid;
+        struct netdev_phys_item_id prev_psid;
+        struct net_device *dev = NULL;
+        int nhsel;
+
+        /* For this route, all nexthop devs must be on the same switch. */
+
+        for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
+                const struct fib_nh *nh = &fi->fib_nh[nhsel];
+
+                if (!nh->nh_dev)
+                        return NULL;
+
+                dev = netdev_switch_get_lowest_dev(nh->nh_dev);
+                if (!dev)
+                        return NULL;
+
+                if (netdev_switch_parent_id_get(dev, &psid))
+                        return NULL;
+
+                if (nhsel > 0) {
+                        if (prev_psid.id_len != psid.id_len)
+                                return NULL;
+                        if (memcmp(prev_psid.id, psid.id, psid.id_len))
+                                return NULL;
+                }
+
+                prev_psid = psid;
+        }
+
+        return dev;
+}
+
 /**
  *      netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch
  *
@@ -242,11 +301,27 @@ EXPORT_SYMBOL(ndo_dflt_netdev_switch_port_bridge_dellink);
 int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
                                u8 tos, u8 type, u32 tb_id)
 {
+        struct net_device *dev;
+        const struct net_device_ops *ops;
+        int err = 0;
+
         /* Don't offload route if using custom ip rules */
         if (fi->fib_net->ipv4.fib_has_custom_rules)
                 return 0;
 
-        return 0;
+        dev = netdev_switch_get_dev_by_nhs(fi);
+        if (!dev)
+                return 0;
+        ops = dev->netdev_ops;
+
+        if (ops->ndo_switch_fib_ipv4_add) {
+                err = ops->ndo_switch_fib_ipv4_add(dev, htonl(dst), dst_len,
+                                                   fi, tos, type, tb_id);
+                if (!err)
+                        fi->fib_flags |= RTNH_F_EXTERNAL;
+        }
+
+        return err;
 }
 EXPORT_SYMBOL(netdev_switch_fib_ipv4_add);
 
@@ -265,6 +340,25 @@ EXPORT_SYMBOL(netdev_switch_fib_ipv4_add);
 int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
                                u8 tos, u8 type, u32 tb_id)
 {
-        return 0;
+        struct net_device *dev;
+        const struct net_device_ops *ops;
+        int err = 0;
+
+        if (!(fi->fib_flags & RTNH_F_EXTERNAL))
+                return 0;
+
+        dev = netdev_switch_get_dev_by_nhs(fi);
+        if (!dev)
+                return 0;
+        ops = dev->netdev_ops;
+
+        if (ops->ndo_switch_fib_ipv4_del) {
+                err = ops->ndo_switch_fib_ipv4_del(dev, htonl(dst), dst_len,
+                                                   fi, tos, type, tb_id);
+                if (!err)
+                        fi->fib_flags &= ~RTNH_F_EXTERNAL;
+        }
+
+        return err;
 }
 EXPORT_SYMBOL(netdev_switch_fib_ipv4_del);