macvtap: Limit packet queue length

[linux-drm-fsl-dcu.git] / drivers / net / macvtap.c

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index a8a94e2f6ddcfc04917ab2ec39305ac26e69ecf2..ff02b836c3c4a3d23c6b78fc707508b40732d9f8 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -180,11 +180,18 @@ static int macvtap_forward(struct net_device *dev, struct sk_buff *skb)
 {
        struct macvtap_queue *q = macvtap_get_queue(dev, skb);
        if (!q)
-               return -ENOLINK;
+               goto drop;
+
+       if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len)
+               goto drop;
 
        skb_queue_tail(&q->sk.sk_receive_queue, skb);
        wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND);
-       return 0;
+       return NET_RX_SUCCESS;
+
+drop:
+       kfree_skb(skb);
+       return NET_RX_DROP;
 }
 
 /*
@@ -235,8 +242,15 @@ static void macvtap_dellink(struct net_device *dev,
        macvlan_dellink(dev, head);
 }
 
+static void macvtap_setup(struct net_device *dev)
+{
+       macvlan_common_setup(dev);
+       dev->tx_queue_len = TUN_READQ_SIZE;
+}
+
 static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
        .kind           = "macvtap",
+       .setup          = macvtap_setup,
        .newlink        = macvtap_newlink,
        .dellink        = macvtap_dellink,
 };