switchdev: add netlink flags to IPv4 FIB add op

Pass in the netlink flags (NLM_F_*) into switchdev driver for IPv4 FIB add op
to allow driver to 1) optimize hardware updates, 2) handle ip route prepend
and append commands correctly.

Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Suggested-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 17 insertions, 7 deletions

diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
index 65e140315a58..223348d8cc07 100644
--- a/drivers/net/ethernet/rocker/rocker.c
+++ b/drivers/net/ethernet/rocker/rocker.c
@@ -4152,7 +4152,8 @@ static int rocker_port_switch_port_stp_update(struct net_device *dev, u8 state)
 static int rocker_port_switch_fib_ipv4_add(struct net_device *dev,
                                            __be32 dst, int dst_len,
                                            struct fib_info *fi,
-                                           u8 tos, u8 type, u32 tb_id)
+                                           u8 tos, u8 type,
+                                           u32 nlflags, u32 tb_id)
 {
         struct rocker_port *rocker_port = netdev_priv(dev);
         int flags = 0;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 45413784a3b1..1354ae83efc8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1035,7 +1035,7 @@ struct fib_info;
  *      state change.
  * int (*ndo_sw_parent_fib_ipv4_add)(struct net_device *dev, __be32 dst,
  *                                   int dst_len, struct fib_info *fi,
- *                                   u8 tos, u8 type, u32 tb_id);
+ *                                   u8 tos, u8 type, u32 nlflags, u32 tb_id);
  *      Called to add/modify IPv4 route to switch device.
  * int (*ndo_sw_parent_fib_ipv4_del)(struct net_device *dev, __be32 dst,
  *                                   int dst_len, struct fib_info *fi,
@@ -1207,6 +1207,7 @@ struct net_device_ops {
                                                            int dst_len,
                                                            struct fib_info *fi,
                                                            u8 tos, u8 type,
+                                                           u32 nlflags,
                                                            u32 tb_id);
         int                     (*ndo_switch_fib_ipv4_del)(struct net_device *dev,
                                                            __be32 dst,
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 933fac410a7a..1a9382febcc3 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -1,6 +1,7 @@
 /*
  * include/net/switchdev.h - Switch device API
  * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
+ * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.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
@@ -52,7 +53,7 @@ int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev,
 int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev,
                                                struct nlmsghdr *nlh, u16 flags);
 int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
-                               u8 tos, u8 type, u32 tb_id);
+                               u8 tos, u8 type, u32 nlflags, u32 tb_id);
 int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
                                u8 tos, u8 type, u32 tb_id);
 void netdev_switch_fib_ipv4_abort(struct fib_info *fi);
@@ -117,7 +118,8 @@ static inline int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *
 
 static inline int netdev_switch_fib_ipv4_add(u32 dst, int dst_len,
                                              struct fib_info *fi,
-                                             u8 tos, u8 type, u32 tb_id)
+                                             u8 tos, u8 type,
+                                             u32 nlflags, u32 tb_id)
 {
         return 0;
 }
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 90955455884e..fcfa9825a816 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1155,6 +1155,7 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
                         err = netdev_switch_fib_ipv4_add(key, plen, fi,
                                                          new_fa->fa_tos,
                                                          cfg->fc_type,
+                                                         cfg->fc_nlflags,
                                                          tb->tb_id);
                         if (err) {
                                 netdev_switch_fib_ipv4_abort(fi);
@@ -1201,7 +1202,9 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
 
         /* (Optionally) offload fib entry to switch hardware. */
         err = netdev_switch_fib_ipv4_add(key, plen, fi, tos,
-                                         cfg->fc_type, tb->tb_id);
+                                         cfg->fc_type,
+                                         cfg->fc_nlflags,
+                                         tb->tb_id);
         if (err) {
                 netdev_switch_fib_ipv4_abort(fi);
                 goto out_free_new_fa;
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index aba6aa2656d8..8cf42a69baf4 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -1,6 +1,7 @@
 /*
  * net/switchdev/switchdev.c - Switch device API
  * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
+ * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.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
@@ -294,12 +295,13 @@ static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi)
  *      @fi: route FIB info structure
  *      @tos: route TOS
  *      @type: route type
+ *      @nlflags: netlink flags passed in (NLM_F_*)
  *      @tb_id: route table ID
  *
  *      Add IPv4 route entry to switch device.
  */
 int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
-                               u8 tos, u8 type, u32 tb_id)
+                               u8 tos, u8 type, u32 nlflags, u32 tb_id)
 {
         struct net_device *dev;
         const struct net_device_ops *ops;
@@ -324,7 +326,8 @@ int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
 
         if (ops->ndo_switch_fib_ipv4_add) {
                 err = ops->ndo_switch_fib_ipv4_add(dev, htonl(dst), dst_len,
-                                                   fi, tos, type, tb_id);
+                                                   fi, tos, type, nlflags,
+                                                   tb_id);
                 if (!err)
                         fi->fib_flags |= RTNH_F_EXTERNAL;
         }