Re: [PATCH net-next 2/2] net: vrf: Add l3mdev rules on first device create

Add l3mdev rule per address family when the first VRF device is
created. Remove them when the last is deleted.

Signed-off-by: David Ahern <redacted>
---
 drivers/net/vrf.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 113 insertions(+), 1 deletion(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index dff08842f26d..b3cb80e84ea7 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c

@@ -35,6 +35,7 @@
 #include <net/route.h>
 #include <net/addrconf.h>
 #include <net/l3mdev.h>
+#include <net/fib_rules.h>
 
 #define RT_FL_TOS(oldflp4) \
 	((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))

@@ -42,6 +43,11 @@
 #define DRV_NAME	"vrf"
 #define DRV_VERSION	"1.0"
 
+static atomic_t num_vrfs;
+
+static u32 rule_pref = 1000;
+module_param(rule_pref, uint,  S_IRUGO);
+
 struct net_vrf {
 	struct rtable __rcu	*rth;
 	struct rt6_info	__rcu	*rt6;

@@ -723,6 +729,93 @@ static const struct ethtool_ops vrf_ethtool_ops = {
 	.get_drvinfo	= vrf_get_drvinfo,
 };
 
+static inline size_t vrf_fib_rule_nl_size(void)
+{
+	size_t sz;
+
+	sz  = NLMSG_ALIGN(sizeof(struct fib_rule_hdr));
+	sz += nla_total_size(sizeof(u8));	/* FRA_L3MDEV */
+	sz += nla_total_size(sizeof(u32));	/* FRA_PRIORITY */
+
+	return sz;
+}
+
+static int vrf_fib_rule(const struct net_device *dev, __u8 family, bool add_it)