net/core: Introduce netdev_get_xmit_slave

Add new ndo to get the xmit slave of master device. The reference
counters are not incremented so the caller must be careful with locks.
User can ask to get the xmit slave assume all the slaves can
transmit by set all_slaves arg to true.

Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 130a668049ab06dc2be988de296bf6c6edce1e4c..26bc0f11b7adbf02bcb58ffedb2828edc77b613a 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1146,6 +1146,12 @@ struct netdev_net_notifier {
  * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
  *     Called to release previously enslaved netdev.
  *
+ * struct net_device *(*ndo_get_xmit_slave)(struct net_device *dev,
+ *                                         struct sk_buff *skb,
+ *                                         bool all_slaves);
+ *     Get the xmit slave of master device. If all_slaves is true, function
+ *     assume all the slaves can transmit.
+ *
  *      Feature/offload setting functions.
  * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
  *             netdev_features_t features);
@@ -1389,6 +1395,9 @@ struct net_device_ops {
                                                 struct netlink_ext_ack *extack);
        int                     (*ndo_del_slave)(struct net_device *dev,
                                                 struct net_device *slave_dev);
+       struct net_device*      (*ndo_get_xmit_slave)(struct net_device *dev,
+                                                     struct sk_buff *skb,
+                                                     bool all_slaves);
        netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
                                                    netdev_features_t features);
        int                     (*ndo_set_features)(struct net_device *dev,
@@ -2731,6 +2740,9 @@ void netdev_freemem(struct net_device *dev);
 void synchronize_net(void);
 int init_dummy_netdev(struct net_device *dev);
 
+struct net_device *netdev_get_xmit_slave(struct net_device *dev,
+                                        struct sk_buff *skb,
+                                        bool all_slaves);
 struct net_device *dev_get_by_index(struct net *net, int ifindex);
 struct net_device *__dev_get_by_index(struct net *net, int ifindex);
 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);

diff --git a/net/core/dev.c b/net/core/dev.c
index 9c9e763bfe0e38ff843fa590ff83617a8d2feacc..e6c10980abfd57db64e26cfd2b786ec6ee0c1e6a 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7785,6 +7785,28 @@ void netdev_bonding_info_change(struct net_device *dev,
 }
 EXPORT_SYMBOL(netdev_bonding_info_change);
 
+/**
+ * netdev_get_xmit_slave - Get the xmit slave of master device
+ * @skb: The packet
+ * @all_slaves: assume all the slaves are active
+ *
+ * The reference counters are not incremented so the caller must be
+ * careful with locks. The caller must hold RCU lock.
+ * %NULL is returned if no slave is found.
+ */
+
+struct net_device *netdev_get_xmit_slave(struct net_device *dev,
+                                        struct sk_buff *skb,
+                                        bool all_slaves)
+{
+       const struct net_device_ops *ops = dev->netdev_ops;
+
+       if (!ops->ndo_get_xmit_slave)
+               return NULL;
+       return ops->ndo_get_xmit_slave(dev, skb, all_slaves);
+}
+EXPORT_SYMBOL(netdev_get_xmit_slave);
+
 static void netdev_adjacent_add_links(struct net_device *dev)
 {
        struct netdev_adjacent *iter;