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inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test

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We can simply remove the INET_FRAG_EVICTED flag to avoid all the flags
race conditions with the evictor and use a participation test for the
evictor list, when we're at that point (after inet_frag_kill) in the
timer there're 2 possible cases:

1. The evictor added the entry to its evictor list while the timer was
waiting for the chainlock
or
2. The timer unchained the entry and the evictor won't see it

In both cases we should be able to see list_evictor correctly due
to the sync on the chainlock.

Joint work with Florian Westphal.

Tested-by: Frank Schreuder <fschreuder@transip.nl>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2015-07-23 12:05:40 +02:00 committed by David S. Miller
parent 5719b296fb
commit caaecdd3d3
4 changed files with 7 additions and 5 deletions
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7
include/net/inet_frag.h
View File

@ -21,13 +21,11 @@ struct netns_frags {
* @INET_FRAG_FIRST_IN: first fragment has arrived * @INET_FRAG_FIRST_IN: first fragment has arrived
* @INET_FRAG_LAST_IN: final fragment has arrived * @INET_FRAG_LAST_IN: final fragment has arrived
* @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction
* @INET_FRAG_EVICTED: frag queue is being evicted
*/ */
enum { enum {
INET_FRAG_FIRST_IN = BIT(0), INET_FRAG_FIRST_IN = BIT(0),
INET_FRAG_LAST_IN = BIT(1), INET_FRAG_LAST_IN = BIT(1),
INET_FRAG_COMPLETE = BIT(2), INET_FRAG_COMPLETE = BIT(2),
INET_FRAG_EVICTED = BIT(3)
}; };
/** /**
@ -127,6 +125,11 @@ static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f
inet_frag_destroy(q, f); inet_frag_destroy(q, f);
} }
static inline bool inet_frag_evicting(struct inet_frag_queue *q)
{
return !hlist_unhashed(&q->list_evictor);
}
/* Memory Tracking Functions. */ /* Memory Tracking Functions. */
/* The default percpu_counter batch size is not big enough to scale to /* The default percpu_counter batch size is not big enough to scale to

1
net/ipv4/inet_fragment.c
View File

@ -140,7 +140,6 @@ inet_evict_bucket(struct inet_frags *f, struct inet_frag_bucket *hb)
if (!del_timer(&fq->timer)) if (!del_timer(&fq->timer))
continue; continue;
fq->flags |= INET_FRAG_EVICTED;
hlist_add_head(&fq->list_evictor, &expired); hlist_add_head(&fq->list_evictor, &expired);
++evicted; ++evicted;
} }

2
net/ipv4/ip_fragment.c
View File

@ -202,7 +202,7 @@ static void ip_expire(unsigned long arg)
ipq_kill(qp); ipq_kill(qp);
IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS); IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS);
if (!(qp->q.flags & INET_FRAG_EVICTED)) { if (!inet_frag_evicting(&qp->q)) {
struct sk_buff *head = qp->q.fragments; struct sk_buff *head = qp->q.fragments;
const struct iphdr *iph; const struct iphdr *iph;
int err; int err;

2
net/ipv6/reassembly.c
View File

@ -144,7 +144,7 @@ void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
if (fq->q.flags & INET_FRAG_EVICTED) if (inet_frag_evicting(&fq->q))
goto out_rcu_unlock; goto out_rcu_unlock;
IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT); IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);