netdev - [PATCH net-next 07/18] ipv6: Check nexthop flags during route lookup instead of carrier

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Message-Id: <20180107104518.31693-8-idosch@mellanox.com>
Date:   Sun,  7 Jan 2018 12:45:07 +0200
From:   Ido Schimmel <idosch@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, dsahern@...il.com, roopa@...ulusnetworks.com,
        nicolas.dichtel@...nd.com, weiwan@...gle.com, kafai@...com,
        yoshfuji@...ux-ipv6.org, mlxsw@...lanox.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 07/18] ipv6: Check nexthop flags during route lookup instead of carrier

Now that the RTNH_F_LINKDOWN flag is set in nexthops, we can avoid the
need to dereference the nexthop device and check its carrier and instead
check for the presence of the flag.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 net/ipv6/route.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 314e3bf41f6f..ab0eed43ed97 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -474,7 +474,7 @@ static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
 			if (route_choosen == 0) {
 				struct inet6_dev *idev = sibling->rt6i_idev;
 
-				if (!netif_carrier_ok(sibling->dst.dev) &&
+				if (sibling->rt6i_nh_flags & RTNH_F_LINKDOWN &&
 				    idev->cnf.ignore_routes_with_linkdown)
 					break;
 				if (rt6_score_route(sibling, oif, strict) < 0)
@@ -679,10 +679,9 @@ static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 	int m;
 	bool match_do_rr = false;
 	struct inet6_dev *idev = rt->rt6i_idev;
-	struct net_device *dev = rt->dst.dev;
 
-	if (dev && !netif_carrier_ok(dev) &&
-	    idev->cnf.ignore_routes_with_linkdown &&
+	if (idev->cnf.ignore_routes_with_linkdown &&
+	    rt->rt6i_nh_flags & RTNH_F_LINKDOWN &&
 	    !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
 		goto out;
 
-- 
2.14.3