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| author | Rusty Russell <rusty@rustcorp.com.au> | 2010-07-02 16:34:01 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-05-09 15:55:21 -0700 |
| commit | 5e93019e4a06ade55e91010371ee22a218190567 (patch) | |
| tree | ddd7a6031108493c6b27ec9cb42b9f0dee706ebb | |
| parent | f32cd617fe33ad12fc41ea84d7e994e75eab266e (diff) | |
| download | lwn-5e93019e4a06ade55e91010371ee22a218190567.tar.gz lwn-5e93019e4a06ade55e91010371ee22a218190567.zip | |
virtio_net: fix oom handling on tx
commit 58eba97d0774c69b1cf3e5a8ac74419409d1abbf upstream.
virtio net will never try to overflow the TX ring, so the only reason
add_buf may fail is out of memory. Thus, we can not stop the
device until some request completes - there's no guarantee anything
at all is outstanding.
Make the error message clearer as well: error here does not
indicate queue full.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/virtio_net.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index fb09effbfb63..bf6d850a6586 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -525,7 +525,6 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) struct virtnet_info *vi = netdev_priv(dev); int capacity; -again: /* Free up any pending old buffers before queueing new ones. */ free_old_xmit_skbs(vi); @@ -534,14 +533,20 @@ again: /* This can happen with OOM and indirect buffers. */ if (unlikely(capacity < 0)) { - netif_stop_queue(dev); - dev_warn(&dev->dev, "Unexpected full queue\n"); - if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { - vi->svq->vq_ops->disable_cb(vi->svq); - netif_start_queue(dev); - goto again; + if (net_ratelimit()) { + if (likely(capacity == -ENOMEM)) { + dev_warn(&dev->dev, + "TX queue failure: out of memory\n"); + } else { + dev->stats.tx_fifo_errors++; + dev_warn(&dev->dev, + "Unexpected TX queue failure: %d\n", + capacity); + } } - return NETDEV_TX_BUSY; + dev->stats.tx_dropped++; + kfree_skb(skb); + return NETDEV_TX_OK; } vi->svq->vq_ops->kick(vi->svq); |