diff options
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nf_conntrack_core.c | 85 |
1 files changed, 68 insertions, 17 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 917e708a4561..3a98a1316307 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -66,6 +66,8 @@ EXPORT_SYMBOL_GPL(nf_conntrack_hash); struct conntrack_gc_work { struct delayed_work dwork; u32 next_bucket; + u32 avg_timeout; + u32 start_time; bool exiting; bool early_drop; }; @@ -77,8 +79,19 @@ static __read_mostly bool nf_conntrack_locks_all; /* serialize hash resizes and nf_ct_iterate_cleanup */ static DEFINE_MUTEX(nf_conntrack_mutex); -#define GC_SCAN_INTERVAL (120u * HZ) +#define GC_SCAN_INTERVAL_MAX (60ul * HZ) +#define GC_SCAN_INTERVAL_MIN (1ul * HZ) + +/* clamp timeouts to this value (TCP unacked) */ +#define GC_SCAN_INTERVAL_CLAMP (300ul * HZ) + +/* large initial bias so that we don't scan often just because we have + * three entries with a 1s timeout. + */ +#define GC_SCAN_INTERVAL_INIT INT_MAX + #define GC_SCAN_MAX_DURATION msecs_to_jiffies(10) +#define GC_SCAN_EXPIRED_MAX (64000u / HZ) #define MIN_CHAINLEN 8u #define MAX_CHAINLEN (32u - MIN_CHAINLEN) @@ -1420,16 +1433,28 @@ static bool gc_worker_can_early_drop(const struct nf_conn *ct) static void gc_worker(struct work_struct *work) { - unsigned long end_time = jiffies + GC_SCAN_MAX_DURATION; unsigned int i, hashsz, nf_conntrack_max95 = 0; - unsigned long next_run = GC_SCAN_INTERVAL; + u32 end_time, start_time = nfct_time_stamp; struct conntrack_gc_work *gc_work; + unsigned int expired_count = 0; + unsigned long next_run; + s32 delta_time; + gc_work = container_of(work, struct conntrack_gc_work, dwork.work); i = gc_work->next_bucket; if (gc_work->early_drop) nf_conntrack_max95 = nf_conntrack_max / 100u * 95u; + if (i == 0) { + gc_work->avg_timeout = GC_SCAN_INTERVAL_INIT; + gc_work->start_time = start_time; + } + + next_run = gc_work->avg_timeout; + + end_time = start_time + GC_SCAN_MAX_DURATION; + do { struct nf_conntrack_tuple_hash *h; struct hlist_nulls_head *ct_hash; @@ -1446,6 +1471,7 @@ static void gc_worker(struct work_struct *work) hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[i], hnnode) { struct nf_conntrack_net *cnet; + unsigned long expires; struct net *net; tmp = nf_ct_tuplehash_to_ctrack(h); @@ -1455,11 +1481,29 @@ static void gc_worker(struct work_struct *work) continue; } + if (expired_count > GC_SCAN_EXPIRED_MAX) { + rcu_read_unlock(); + + gc_work->next_bucket = i; + gc_work->avg_timeout = next_run; + + delta_time = nfct_time_stamp - gc_work->start_time; + + /* re-sched immediately if total cycle time is exceeded */ + next_run = delta_time < (s32)GC_SCAN_INTERVAL_MAX; + goto early_exit; + } + if (nf_ct_is_expired(tmp)) { nf_ct_gc_expired(tmp); + expired_count++; continue; } + expires = clamp(nf_ct_expires(tmp), GC_SCAN_INTERVAL_MIN, GC_SCAN_INTERVAL_CLAMP); + next_run += expires; + next_run /= 2u; + if (nf_conntrack_max95 == 0 || gc_worker_skip_ct(tmp)) continue; @@ -1477,8 +1521,10 @@ static void gc_worker(struct work_struct *work) continue; } - if (gc_worker_can_early_drop(tmp)) + if (gc_worker_can_early_drop(tmp)) { nf_ct_kill(tmp); + expired_count++; + } nf_ct_put(tmp); } @@ -1491,33 +1537,38 @@ static void gc_worker(struct work_struct *work) cond_resched(); i++; - if (time_after(jiffies, end_time) && i < hashsz) { + delta_time = nfct_time_stamp - end_time; + if (delta_time > 0 && i < hashsz) { + gc_work->avg_timeout = next_run; gc_work->next_bucket = i; next_run = 0; - break; + goto early_exit; } } while (i < hashsz); + gc_work->next_bucket = 0; + + next_run = clamp(next_run, GC_SCAN_INTERVAL_MIN, GC_SCAN_INTERVAL_MAX); + + delta_time = max_t(s32, nfct_time_stamp - gc_work->start_time, 1); + if (next_run > (unsigned long)delta_time) + next_run -= delta_time; + else + next_run = 1; + +early_exit: if (gc_work->exiting) return; - /* - * Eviction will normally happen from the packet path, and not - * from this gc worker. - * - * This worker is only here to reap expired entries when system went - * idle after a busy period. - */ - if (next_run) { + if (next_run) gc_work->early_drop = false; - gc_work->next_bucket = 0; - } + queue_delayed_work(system_power_efficient_wq, &gc_work->dwork, next_run); } static void conntrack_gc_work_init(struct conntrack_gc_work *gc_work) { - INIT_DEFERRABLE_WORK(&gc_work->dwork, gc_worker); + INIT_DELAYED_WORK(&gc_work->dwork, gc_worker); gc_work->exiting = false; } |