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dpaa2-eth: fix race condition with bql frame accounting 

It might happen that Tx conf acknowledges a frame before it was
subscribed in bql, as subscribing was previously done after the enqueue
operation.

This patch moves the netdev_tx_sent_queue call before the actual frame
enqueue, so that this can never happen.

Fixes: 569dac6a5a ("dpaa2-eth: bql support")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ioana Ciornei 2019-03-25 13:06:22 +00:00 committed by David S. Miller
parent 047a013f8d
commit 8c838f53e1
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
View File

@ -815,6 +815,14 @@ static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
*/
queue_mapping = skb_get_queue_mapping(skb);
fq = &priv->fq[queue_mapping];
fd_len = dpaa2_fd_get_len(&fd);
nq = netdev_get_tx_queue(net_dev, queue_mapping);
netdev_tx_sent_queue(nq, fd_len);
/* Everything that happens after this enqueues might race with
* the Tx confirmation callback for this frame
*/
for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
err = priv->enqueue(priv, fq, &fd, 0);
if (err != -EBUSY)
@ -825,13 +833,10 @@ static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
percpu_stats->tx_errors++;
/* Clean up everything, including freeing the skb */
free_tx_fd(priv, fq, &fd, false);
netdev_tx_completed_queue(nq, 1, fd_len);
} else {
fd_len = dpaa2_fd_get_len(&fd);
percpu_stats->tx_packets++;
percpu_stats->tx_bytes += fd_len;
nq = netdev_get_tx_queue(net_dev, queue_mapping);
netdev_tx_sent_queue(nq, fd_len);
}
return NETDEV_TX_OK;