netdev - [PATCH net-next 1/4] ipv6: get rid of net->ipv6.rt6_stats->fib_rt

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Message-Id: <20220210214231.2420942-2-eric.dumazet@gmail.com>
Date:   Thu, 10 Feb 2022 13:42:28 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 1/4] ipv6: get rid of net->ipv6.rt6_stats->fib_rt_uncache

From: Eric Dumazet <edumazet@...gle.com>

This counter has never been visible, there is little point
trying to maintain it.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/ip6_fib.h   | 3 +--
 net/ipv6/route.c        | 4 ----
 net/ipv6/xfrm6_policy.c | 1 -
 3 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 40ae8f1b18e502cece9f11b3a60c9cc30c2e1a5e..32c83bb688798b5c12f8aeea1c66debe866689d8 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -367,9 +367,8 @@ struct rt6_statistics {
 	__u32		fib_rt_cache;		/* cached rt entries in exception table */
 	__u32		fib_discarded_routes;	/* total number of routes delete */
 
-	/* The following stats are not protected by any lock */
+	/* The following stat is not protected by any lock */
 	atomic_t	fib_rt_alloc;		/* total number of routes alloced */
-	atomic_t	fib_rt_uncache;		/* rt entries in uncached list */
 };
 
 #define RTN_TL_ROOT	0x0001
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index f4884cda13b92e72d041680cbabfee2e07ec0f10..53acd1568ebcceb1a1697579ed505cefc7a35a65 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -149,11 +149,9 @@ void rt6_uncached_list_del(struct rt6_info *rt)
 {
 	if (!list_empty(&rt->rt6i_uncached)) {
 		struct uncached_list *ul = rt->rt6i_uncached_list;
-		struct net *net = dev_net(rt->dst.dev);
 
 		spin_lock_bh(&ul->lock);
 		list_del(&rt->rt6i_uncached);
-		atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
 		spin_unlock_bh(&ul->lock);
 	}
 }
@@ -2244,7 +2242,6 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 			 * if caller sets RT6_LOOKUP_F_DST_NOREF flag.
 			 */
 			rt6_uncached_list_add(rt);
-			atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
 			rcu_read_unlock();
 
 			return rt;
@@ -3287,7 +3284,6 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 	 * do proper release of the net_device
 	 */
 	rt6_uncached_list_add(rt);
-	atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
 
 	dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
 
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index fad687ee6dd81af9ee3591eb2333cfed8ceae8ce..55bb2cbae13ddc236e420fae37cd42bbad14d1b2 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -92,7 +92,6 @@ static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
 	xdst->u.rt6.rt6i_src = rt->rt6i_src;
 	INIT_LIST_HEAD(&xdst->u.rt6.rt6i_uncached);
 	rt6_uncached_list_add(&xdst->u.rt6);
-	atomic_inc(&dev_net(dev)->ipv6.rt6_stats->fib_rt_uncache);
 
 	return 0;
 }
-- 
2.35.1.265.g69c8d7142f-goog