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Date: Thu, 28 Jul 2011 09:13:03 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>
Subject: [PATCH] ipv6: some RCU conversions
ICMP and ND are not fast path, but still we can avoid changing idev
refcount, using RCU.
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
net/ipv6/icmp.c | 25 ++++++++++---------------
net/ipv6/ndisc.c | 31 +++++++++++--------------------
2 files changed, 21 insertions(+), 35 deletions(-)
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 1190041..2b59154 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -490,7 +490,8 @@ void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
goto out_dst_release;
}
- idev = in6_dev_get(skb->dev);
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
err = ip6_append_data(sk, icmpv6_getfrag, &msg,
len + sizeof(struct icmp6hdr),
@@ -500,19 +501,16 @@ void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
if (err) {
ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
ip6_flush_pending_frames(sk);
- goto out_put;
+ } else {
+ err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
+ len + sizeof(struct icmp6hdr));
}
- err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, len + sizeof(struct icmp6hdr));
-
-out_put:
- if (likely(idev != NULL))
- in6_dev_put(idev);
+ rcu_read_unlock();
out_dst_release:
dst_release(dst);
out:
icmpv6_xmit_unlock(sk);
}
-
EXPORT_SYMBOL(icmpv6_send);
static void icmpv6_echo_reply(struct sk_buff *skb)
@@ -569,7 +567,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
if (hlimit < 0)
hlimit = ip6_dst_hoplimit(dst);
- idev = in6_dev_get(skb->dev);
+ idev = __in6_dev_get(skb->dev);
msg.skb = skb;
msg.offset = 0;
@@ -583,13 +581,10 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
if (err) {
ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
ip6_flush_pending_frames(sk);
- goto out_put;
+ } else {
+ err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
+ skb->len + sizeof(struct icmp6hdr));
}
- err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
-
-out_put:
- if (likely(idev != NULL))
- in6_dev_put(idev);
dst_release(dst);
out:
icmpv6_xmit_unlock(sk);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 9da6e02..1f52dd2 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -533,7 +533,8 @@ void ndisc_send_skb(struct sk_buff *skb,
skb_dst_set(skb, dst);
- idev = in6_dev_get(dst->dev);
+ rcu_read_lock();
+ idev = __in6_dev_get(dst->dev);
IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
@@ -543,8 +544,7 @@ void ndisc_send_skb(struct sk_buff *skb,
ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
}
- if (likely(idev != NULL))
- in6_dev_put(idev);
+ rcu_read_unlock();
}
EXPORT_SYMBOL(ndisc_send_skb);
@@ -1039,7 +1039,7 @@ static void ndisc_recv_rs(struct sk_buff *skb)
if (skb->len < sizeof(*rs_msg))
return;
- idev = in6_dev_get(skb->dev);
+ idev = __in6_dev_get(skb->dev);
if (!idev) {
if (net_ratelimit())
ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
@@ -1080,7 +1080,7 @@ static void ndisc_recv_rs(struct sk_buff *skb)
neigh_release(neigh);
}
out:
- in6_dev_put(idev);
+ return;
}
static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
@@ -1179,7 +1179,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
* set the RA_RECV flag in the interface
*/
- in6_dev = in6_dev_get(skb->dev);
+ in6_dev = __in6_dev_get(skb->dev);
if (in6_dev == NULL) {
ND_PRINTK0(KERN_ERR
"ICMPv6 RA: can't find inet6 device for %s.\n",
@@ -1188,7 +1188,6 @@ static void ndisc_router_discovery(struct sk_buff *skb)
}
if (!ndisc_parse_options(opt, optlen, &ndopts)) {
- in6_dev_put(in6_dev);
ND_PRINTK2(KERN_WARNING
"ICMP6 RA: invalid ND options\n");
return;
@@ -1255,7 +1254,6 @@ static void ndisc_router_discovery(struct sk_buff *skb)
ND_PRINTK0(KERN_ERR
"ICMPv6 RA: %s() failed to add default route.\n",
__func__);
- in6_dev_put(in6_dev);
return;
}
@@ -1265,7 +1263,6 @@ static void ndisc_router_discovery(struct sk_buff *skb)
"ICMPv6 RA: %s() got default router without neighbour.\n",
__func__);
dst_release(&rt->dst);
- in6_dev_put(in6_dev);
return;
}
neigh->flags |= NTF_ROUTER;
@@ -1422,7 +1419,6 @@ out:
dst_release(&rt->dst);
else if (neigh)
neigh_release(neigh);
- in6_dev_put(in6_dev);
}
static void ndisc_redirect_rcv(struct sk_buff *skb)
@@ -1481,13 +1477,11 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
return;
}
- in6_dev = in6_dev_get(skb->dev);
+ in6_dev = __in6_dev_get(skb->dev);
if (!in6_dev)
return;
- if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
- in6_dev_put(in6_dev);
+ if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
return;
- }
/* RFC2461 8.1:
* The IP source address of the Redirect MUST be the same as the current
@@ -1497,7 +1491,6 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 Redirect: invalid ND options\n");
- in6_dev_put(in6_dev);
return;
}
if (ndopts.nd_opts_tgt_lladdr) {
@@ -1506,7 +1499,6 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
if (!lladdr) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 Redirect: invalid link-layer address length\n");
- in6_dev_put(in6_dev);
return;
}
}
@@ -1518,7 +1510,6 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
on_link);
neigh_release(neigh);
}
- in6_dev_put(in6_dev);
}
void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
@@ -1651,7 +1642,8 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
csum_partial(icmph, len, 0));
skb_dst_set(buff, dst);
- idev = in6_dev_get(dst->dev);
+ rcu_read_lock();
+ idev = __in6_dev_get(dst->dev);
IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
dst_output);
@@ -1660,8 +1652,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
}
- if (likely(idev != NULL))
- in6_dev_put(idev);
+ rcu_read_unlock();
return;
release:
--
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