netdev - [PATCH net-next 05/10] IPv6: Extend 'fib_notify_on_flag

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Date:   Sun,  7 Feb 2021 10:22:53 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, dsahern@...il.com,
        jiri@...dia.com, yoshfuji@...ux-ipv6.org, amcohen@...dia.com,
        roopa@...dia.com, bpoirier@...dia.com, sharpd@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 05/10] IPv6: Extend 'fib_notify_on_flag_change' sysctl

From: Amit Cohen <amcohen@...dia.com>

Add the value '2' to 'fib_notify_on_flag_change' to allow sending
notifications only for failed route installation.

Separate value is added for such notifications because there are less of
them, so they do not impact performance and some users will find them more
important.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 Documentation/networking/ip-sysctl.rst | 3 ++-
 net/ipv6/route.c                       | 6 ++++++
 net/ipv6/sysctl_net_ipv6.c             | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index cd0ec577a5b5..83ff5158005a 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -1798,7 +1798,7 @@ nexthop_compat_mode - BOOLEAN
 
 fib_notify_on_flag_change - INTEGER
         Whether to emit RTM_NEWROUTE notifications whenever RTM_F_OFFLOAD/
-        RTM_F_TRAP flags are changed.
+        RTM_F_TRAP/RTM_F_OFFLOAD_FAILED flags are changed.
 
         After installing a route to the kernel, user space receives an
         acknowledgment, which means the route was installed in the kernel,
@@ -1815,6 +1815,7 @@ fib_notify_on_flag_change - INTEGER
 
         - 0 - Do not emit notifications.
         - 1 - Emit notifications.
+        - 2 - Emit notifications only for RTM_F_OFFLOAD_FAILED flag change.
 
 IPv6 Fragmentation:
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bc75b705f54b..1536f4948e86 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -6083,6 +6083,12 @@ void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
 
 	f6i->offload = offload;
 	f6i->trap = trap;
+
+	/* 2 means send notifications only if offload_failed was changed. */
+	if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 &&
+	    f6i->offload_failed == offload_failed)
+		return;
+
 	f6i->offload_failed = offload_failed;
 
 	if (!rcu_access_pointer(f6i->fib6_node))
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index 392ef01e3366..263ab43ed06b 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -167,7 +167,7 @@ static struct ctl_table ipv6_table_template[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1         = SYSCTL_ZERO,
-		.extra2         = SYSCTL_ONE,
+		.extra2         = &two,
 	},
 	{ }
 };
-- 
2.29.2