diff options
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 8939d2117de2..cc09b67c23bc 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -113,6 +113,7 @@ struct tap_filter { * the netdevice to be fit in one page. So we can make sure the success of * memory allocation. TODO: increase the limit. */ #define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES +#define MAX_TAP_FLOWS 4096 #define TUN_FLOW_EXPIRE (3 * HZ) @@ -185,6 +186,7 @@ struct tun_struct { unsigned int numdisabled; struct list_head disabled; void *security; + u32 flow_count; }; static inline u32 tun_hashfn(u32 rxhash) @@ -218,6 +220,7 @@ static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, e->queue_index = queue_index; e->tun = tun; hlist_add_head_rcu(&e->hash_link, head); + ++tun->flow_count; } return e; } @@ -228,6 +231,7 @@ static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) e->rxhash, e->queue_index); hlist_del_rcu(&e->hash_link); kfree_rcu(e, rcu); + --tun->flow_count; } static void tun_flow_flush(struct tun_struct *tun) @@ -317,7 +321,8 @@ static void tun_flow_update(struct tun_struct *tun, u32 rxhash, e->updated = jiffies; } else { spin_lock_bh(&tun->lock); - if (!tun_flow_find(head, rxhash)) + if (!tun_flow_find(head, rxhash) && + tun->flow_count < MAX_TAP_FLOWS) tun_flow_create(tun, head, rxhash, queue_index); if (!timer_pending(&tun->flow_gc_timer)) |