Dont try to post more send work requests if the TX ring is full.
Setting netif_stop_queue is insufficient: linux can still land
a tx packet on us.
Signed-off-by: Michael S. Tsirkin <[EMAIL PROTECTED]>
Index: openib/drivers/infiniband/ulp/ipoib/ipoib_ib.c
===================================================================
--- openib.orig/drivers/infiniband/ulp/ipoib/ipoib_ib.c 2006-01-10
15:38:36.000000000 +0200
+++ openib/drivers/infiniband/ulp/ipoib/ipoib_ib.c 2006-01-10
18:49:33.000000000 +0200
@@ -344,6 +344,13 @@ void ipoib_send(struct net_device *dev,
* means we have to make sure everything is properly recorded and
* our state is consistent before we call post_send().
*/
+ if (unlikely(priv->tx_head - priv->tx_tail == IPOIB_TX_RING_SIZE)) {
+ ipoib_dbg(priv, "TX ring full, dropping packet\n");
+ ++priv->stats.tx_errors;
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
tx_req = &priv->tx_ring[priv->tx_head & (IPOIB_TX_RING_SIZE - 1)];
tx_req->skb = skb;
addr = dma_map_single(priv->ca->dma_device, skb->data, skb->len,
--
MST
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