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Date: Fri, 20 Dec 2013 11:34:41 +0800
From: Fan Du <fan.du@...driver.com>
To: Eric Dumazet <eric.dumazet@...il.com>
CC: 王聪 <xiyou.wangcong@...il.com>,
<steffen.klassert@...unet.com>, <davem@...emloft.net>,
<netdev@...r.kernel.org>
Subject: [PATCHv4 net-next] xfrm: Namespacify xfrm_policy_sk_bundles
On 2013年12月19日 11:44, Eric Dumazet wrote:
> On Thu, 2013-12-19 at 11:17 +0800, Fan Du wrote:
>>
>
>> diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
>> index 1006a26..22f4f90 100644
>> --- a/include/net/netns/xfrm.h
>> +++ b/include/net/netns/xfrm.h
>> @@ -58,9 +58,9 @@ struct netns_xfrm {
>> struct dst_ops xfrm6_dst_ops;
>> #endif
>> spinlock_t xfrm_state_lock;
>> - spinlock_t xfrm_policy_sk_bundle_lock;
>> rwlock_t xfrm_policy_lock;
>> struct mutex xfrm_cfg_mutex;
>> + struct llist_head xp_sk_bundles_list;
>> };
>>
>> #endif
>> diff --git a/include/net/xfrm.h b/include/net/xfrm.h
>> index 59f5d0a..05296ab 100644
>> --- a/include/net/xfrm.h
>> +++ b/include/net/xfrm.h
>> @@ -957,6 +957,7 @@ struct xfrm_dst {
>> u32 child_mtu_cached;
>> u32 route_cookie;
>> u32 path_cookie;
>> + struct llist_node xdst_llist;
>> };
>>
>
> Hmm... Thats not very nice.
>
> Please reuse the storage adding a llist_node in the union ?
>
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 44995c13e941..3f604f47cc58 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -14,6 +14,7 @@
> #include<linux/rcupdate.h>
> #include<linux/bug.h>
> #include<linux/jiffies.h>
> +#include<linux/llist.h>
> #include<net/neighbour.h>
> #include<asm/processor.h>
>
> @@ -103,6 +104,7 @@ struct dst_entry {
> struct rtable __rcu *rt_next;
> struct rt6_info *rt6_next;
> struct dn_route __rcu *dn_next;
> + struct llist_node llist;
> };
> };
Hi, Eric
You are correct on this, have fix the patch wrt your comments.
Thank you very much.
From 1b929e1cdea978d0c8d10d731af84969bd37004b Mon Sep 17 00:00:00 2001
From: Fan Du <fan.du@...driver.com>
Date: Fri, 20 Dec 2013 11:23:27 +0800
Subject: [PATCHv4 net-next] xfrm: Namespacify xfrm_policy_sk_bundles
xfrm_policy_sk_bundles, protected by net->xfrm.xfrm_policy_sk_bundle_lock
should be put into netns xfrm structure, otherwise xfrm_policy_sk_bundles
can be corrupted from different net namespace.
Moreover current xfrm_policy_sk_bundle_lock used in below two scenarios:
1. xfrm_lookup(Process context) vs __xfrm_garbage_collect(softirq context)
2. xfrm_lookup(Process context) vs __xfrm_garbage_collect(Process context
when SPD change or dev down)
We can use lock less list to cater to those two scenarios as suggested by
Eric Dumazet.
Signed-off-by: Fan Du <fan.du@...driver.com>
Assisted-by: Eric Dumazet <edumazet@...gle.com>
---
v2:
Fix incorrect commit log.
v3:
Drop xchg, use llist instead, adviced by Eric Dumazet.
v4:
Incorporate Eric's comments.
-Union llist with dst_entry->next, which is used for queuing previous,
then it's safe to do so.
-Use llist_for_each_entry_safe for purging list.
-Rebase with net-next, as ipsec-next got pulled.
---
include/net/dst.h | 5 +++++
include/net/netns/xfrm.h | 2 +-
net/xfrm/xfrm_policy.c | 26 ++++++--------------------
3 files changed, 12 insertions(+), 21 deletions(-)
diff --git a/include/net/dst.h b/include/net/dst.h
index 77eb53f..e9b81f0 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -14,6 +14,7 @@
#include <linux/rcupdate.h>
#include <linux/bug.h>
#include <linux/jiffies.h>
+#include <linux/llist.h>
#include <net/neighbour.h>
#include <asm/processor.h>
@@ -103,6 +104,10 @@ struct dst_entry {
struct rtable __rcu *rt_next;
struct rt6_info *rt6_next;
struct dn_route __rcu *dn_next;
+#ifdef CONFIG_XFRM
+ /* Used to queue each policy sk dst */
+ struct llist_node llist;
+#endif
};
};
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index 1006a26..22f4f90 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -58,9 +58,9 @@ struct netns_xfrm {
struct dst_ops xfrm6_dst_ops;
#endif
spinlock_t xfrm_state_lock;
- spinlock_t xfrm_policy_sk_bundle_lock;
rwlock_t xfrm_policy_lock;
struct mutex xfrm_cfg_mutex;
+ struct llist_head xp_sk_bundles_list;
};
#endif
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index a7487f3..0cc7446 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -39,8 +39,6 @@
#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
#define XFRM_MAX_QUEUE_LEN 100
-static struct dst_entry *xfrm_policy_sk_bundles;
-
static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
static struct xfrm_policy_afinfo __rcu *xfrm_policy_afinfo[NPROTO]
__read_mostly;
@@ -2108,12 +2106,7 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
}
dst_hold(&xdst->u.dst);
-
- spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
- xdst->u.dst.next = xfrm_policy_sk_bundles;
- xfrm_policy_sk_bundles = &xdst->u.dst;
- spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
-
+ llist_add(&xdst->u.dst.llist, &net->xfrm.xp_sk_bundles_list);
route = xdst->route;
}
}
@@ -2549,18 +2542,12 @@ static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
static void __xfrm_garbage_collect(struct net *net)
{
- struct dst_entry *head, *next;
+ struct llist_node *head;
+ struct dst_entry *dst, *tmp;
- spin_lock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
- head = xfrm_policy_sk_bundles;
- xfrm_policy_sk_bundles = NULL;
- spin_unlock_bh(&net->xfrm.xfrm_policy_sk_bundle_lock);
-
- while (head) {
- next = head->next;
- dst_free(head);
- head = next;
- }
+ head = llist_del_all(&net->xfrm.xp_sk_bundles_list);
+ llist_for_each_entry_safe(dst, tmp, head, llist)
+ dst_free(dst);
}
void xfrm_garbage_collect(struct net *net)
@@ -2942,7 +2929,6 @@ static int __net_init xfrm_net_init(struct net *net)
/* Initialize the per-net locks here */
spin_lock_init(&net->xfrm.xfrm_state_lock);
rwlock_init(&net->xfrm.xfrm_policy_lock);
- spin_lock_init(&net->xfrm.xfrm_policy_sk_bundle_lock);
mutex_init(&net->xfrm.xfrm_cfg_mutex);
return 0;
--
1.7.9.5
--
浮沉随浪只记今朝笑
--fan
--
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