netdev - [PATCH 3/3] ipv6: icmp: use percpu allocation

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Date:   Fri, 22 Feb 2019 09:58:00 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 3/3] ipv6: icmp: use percpu allocation

Use percpu allocations for the ipv6.icmp_sk.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/net/netns/ipv6.h |  2 +-
 net/ipv6/icmp.c          | 11 +++++------
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index ef1ed529f33c..b028a1dc150d 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -83,7 +83,7 @@ struct netns_ipv6 {
 	struct fib6_table       *fib6_local_tbl;
 	struct fib_rules_ops    *fib6_rules_ops;
 #endif
-	struct sock		**icmp_sk;
+	struct sock * __percpu	*icmp_sk;
 	struct sock             *ndisc_sk;
 	struct sock             *tcp_sk;
 	struct sock             *igmp_sk;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index af520014def5..802faa2fcc0e 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -81,7 +81,7 @@
  */
 static inline struct sock *icmpv6_sk(struct net *net)
 {
-	return net->ipv6.icmp_sk[smp_processor_id()];
+	return *this_cpu_ptr(net->ipv6.icmp_sk);
 }
 
 static int icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
@@ -958,8 +958,8 @@ static void __net_exit icmpv6_sk_exit(struct net *net)
 	int i;
 
 	for_each_possible_cpu(i)
-		inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
-	kfree(net->ipv6.icmp_sk);
+		inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv6.icmp_sk, i));
+	free_percpu(net->ipv6.icmp_sk);
 }
 
 static int __net_init icmpv6_sk_init(struct net *net)
@@ -967,8 +967,7 @@ static int __net_init icmpv6_sk_init(struct net *net)
 	struct sock *sk;
 	int err, i;
 
-	net->ipv6.icmp_sk =
-		kcalloc(nr_cpu_ids, sizeof(struct sock *), GFP_KERNEL);
+	net->ipv6.icmp_sk = alloc_percpu(struct sock *);
 	if (!net->ipv6.icmp_sk)
 		return -ENOMEM;
 
@@ -981,7 +980,7 @@ static int __net_init icmpv6_sk_init(struct net *net)
 			goto fail;
 		}
 
-		net->ipv6.icmp_sk[i] = sk;
+		*per_cpu_ptr(net->ipv6.icmp_sk, i) = sk;
 
 		/* Enough space for 2 64K ICMP packets, including
 		 * sk_buff struct overhead.
-- 
2.20.1