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xfrm: state: remove per-netns gc task 

After commit 5b8ef3415a
("xfrm: Remove ancient sleeping when the SA is in acquire state")
gc does not need any per-netns data anymore.

As far as gc is concerned all state structs are the same, so we
can use a global work struct for it.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Florian Westphal 2016-08-23 16:00:12 +02:00 committed by Steffen Klassert
parent 4141b36ab1
commit 35db57bbc4
2 changed files with 9 additions and 11 deletions
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2
include/net/netns/xfrm.h
View File

@ -44,8 +44,6 @@ struct netns_xfrm {
unsigned int state_hmask;
unsigned int state_num;
struct work_struct state_hash_work;
struct hlist_head state_gc_list;
struct work_struct state_gc_work;
struct list_head policy_all;
struct hlist_head *policy_byidx;

18
net/xfrm/xfrm_state.c
View File

@ -31,6 +31,8 @@
#define xfrm_state_deref_prot(table, net) \
rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
static void xfrm_state_gc_task(struct work_struct *work);
/* Each xfrm_state may be linked to two tables:
1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
@ -41,6 +43,9 @@
static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
static HLIST_HEAD(xfrm_state_gc_list);
static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
{
return atomic_inc_not_zero(&x->refcnt);
@ -368,13 +373,12 @@ static void xfrm_state_gc_destroy(struct xfrm_state *x)
static void xfrm_state_gc_task(struct work_struct *work)
{
struct net *net = container_of(work, struct net, xfrm.state_gc_work);
struct xfrm_state *x;
struct hlist_node *tmp;
struct hlist_head gc_list;
spin_lock_bh(&xfrm_state_gc_lock);
hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
hlist_move_list(&xfrm_state_gc_list, &gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
synchronize_rcu();
@ -515,14 +519,12 @@ EXPORT_SYMBOL(xfrm_state_alloc);
void __xfrm_state_destroy(struct xfrm_state *x)
{
struct net *net = xs_net(x);
WARN_ON(x->km.state != XFRM_STATE_DEAD);
spin_lock_bh(&xfrm_state_gc_lock);
hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
hlist_add_head(&x->gclist, &xfrm_state_gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
schedule_work(&net->xfrm.state_gc_work);
schedule_work(&xfrm_state_gc_work);
}
EXPORT_SYMBOL(__xfrm_state_destroy);
@ -2134,8 +2136,6 @@ int __net_init xfrm_state_init(struct net *net)
net->xfrm.state_num = 0;
INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
spin_lock_init(&net->xfrm.xfrm_state_lock);
return 0;
@ -2153,7 +2153,7 @@ void xfrm_state_fini(struct net *net)
flush_work(&net->xfrm.state_hash_work);
xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
flush_work(&net->xfrm.state_gc_work);
flush_work(&xfrm_state_gc_work);
WARN_ON(!list_empty(&net->xfrm.state_all));