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authorDavid Ahern <dsa@cumulusnetworks.com>2015-09-29 20:07:11 -0700
committerDavid S. Miller <davem@davemloft.net>2015-09-29 20:40:32 -0700
commit1b69c6d0ae90b7f1a4f61d5c8209d5cb7a55f849 (patch)
tree5c32b6f77817a51e86d333e59ae48bdae7b593ad /include
parent007979eaf94d1c888d8c7cf8a5250c2c6c9bd98e (diff)
downloadlinux-1b69c6d0ae90b7f1a4f61d5c8209d5cb7a55f849.tar.bz2
net: Introduce L3 Master device abstraction
L3 master devices allow users of the abstraction to influence FIB lookups for enslaved devices. Current API provides a means for the master device to return a specific FIB table for an enslaved device, to return an rtable/custom dst and influence the OIF used for fib lookups. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netdevice.h3
-rw-r--r--include/net/l3mdev.h125
2 files changed, 128 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 99c33e83822f..c7f14794fe14 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1587,6 +1587,9 @@ struct net_device {
#ifdef CONFIG_NET_SWITCHDEV
const struct switchdev_ops *switchdev_ops;
#endif
+#ifdef CONFIG_NET_L3_MASTER_DEV
+ const struct l3mdev_ops *l3mdev_ops;
+#endif
const struct header_ops *header_ops;
diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h
new file mode 100644
index 000000000000..e382c777bab8
--- /dev/null
+++ b/include/net/l3mdev.h
@@ -0,0 +1,125 @@
+/*
+ * include/net/l3mdev.h - L3 master device API
+ * Copyright (c) 2015 Cumulus Networks
+ * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#ifndef _NET_L3MDEV_H_
+#define _NET_L3MDEV_H_
+
+/**
+ * struct l3mdev_ops - l3mdev operations
+ *
+ * @l3mdev_fib_table: Get FIB table id to use for lookups
+ *
+ * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device
+ */
+
+struct l3mdev_ops {
+ u32 (*l3mdev_fib_table)(const struct net_device *dev);
+ struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
+ const struct flowi4 *fl4);
+};
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+
+int l3mdev_master_ifindex_rcu(struct net_device *dev);
+static inline int l3mdev_master_ifindex(struct net_device *dev)
+{
+ int ifindex;
+
+ rcu_read_lock();
+ ifindex = l3mdev_master_ifindex_rcu(dev);
+ rcu_read_unlock();
+
+ return ifindex;
+}
+
+/* get index of an interface to use for FIB lookups. For devices
+ * enslaved to an L3 master device FIB lookups are based on the
+ * master index
+ */
+static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
+{
+ return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
+}
+
+static inline int l3mdev_fib_oif(struct net_device *dev)
+{
+ int oif;
+
+ rcu_read_lock();
+ oif = l3mdev_fib_oif_rcu(dev);
+ rcu_read_unlock();
+
+ return oif;
+}
+
+u32 l3mdev_fib_table_rcu(const struct net_device *dev);
+u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
+static inline u32 l3mdev_fib_table(const struct net_device *dev)
+{
+ u32 tb_id;
+
+ rcu_read_lock();
+ tb_id = l3mdev_fib_table_rcu(dev);
+ rcu_read_unlock();
+
+ return tb_id;
+}
+
+static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
+ const struct flowi4 *fl4)
+{
+ if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
+ return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
+
+ return NULL;
+}
+
+#else
+
+static inline int l3mdev_master_ifindex_rcu(struct net_device *dev)
+{
+ return 0;
+}
+static inline int l3mdev_master_ifindex(struct net_device *dev)
+{
+ return 0;
+}
+
+static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
+{
+ return dev ? dev->ifindex : 0;
+}
+static inline int l3mdev_fib_oif(struct net_device *dev)
+{
+ return dev ? dev->ifindex : 0;
+}
+
+static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
+{
+ return 0;
+}
+static inline u32 l3mdev_fib_table(const struct net_device *dev)
+{
+ return 0;
+}
+static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
+{
+ return 0;
+}
+
+static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
+ const struct flowi4 *fl4)
+{
+ return NULL;
+}
+
+#endif
+
+#endif /* _NET_L3MDEV_H_ */