summaryrefslogtreecommitdiffstats
path: root/drivers/net/xen-netfront.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/xen-netfront.c')
-rw-r--r--drivers/net/xen-netfront.c60
1 files changed, 31 insertions, 29 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index a479cd99911d..6ffc482550c1 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -57,6 +57,7 @@
#include <xen/interface/grant_table.h>
/* Module parameters */
+#define MAX_QUEUES_DEFAULT 8
static unsigned int xennet_max_queues;
module_param_named(max_queues, xennet_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@@ -281,6 +282,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
{
RING_IDX req_prod = queue->rx.req_prod_pvt;
int notify;
+ int err = 0;
if (unlikely(!netif_carrier_ok(queue->info->netdev)))
return;
@@ -295,8 +297,10 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
struct xen_netif_rx_request *req;
skb = xennet_alloc_one_rx_buffer(queue);
- if (!skb)
+ if (!skb) {
+ err = -ENOMEM;
break;
+ }
id = xennet_rxidx(req_prod);
@@ -320,8 +324,13 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
queue->rx.req_prod_pvt = req_prod;
- /* Not enough requests? Try again later. */
- if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN) {
+ /* Try again later if there are not enough requests or skb allocation
+ * failed.
+ * Enough requests is quantified as the sum of newly created slots and
+ * the unconsumed slots at the backend.
+ */
+ if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN ||
+ unlikely(err)) {
mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
return;
}
@@ -1051,7 +1060,7 @@ err:
if (work_done < budget) {
int more_to_do = 0;
- napi_complete(napi);
+ napi_complete_done(napi, work_done);
RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
if (more_to_do)
@@ -1073,8 +1082,8 @@ static int xennet_change_mtu(struct net_device *dev, int mtu)
return 0;
}
-static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
- struct rtnl_link_stats64 *tot)
+static void xennet_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *tot)
{
struct netfront_info *np = netdev_priv(dev);
int cpu;
@@ -1105,8 +1114,6 @@ static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
tot->rx_errors = dev->stats.rx_errors;
tot->tx_dropped = dev->stats.tx_dropped;
-
- return tot;
}
static void xennet_release_tx_bufs(struct netfront_queue *queue)
@@ -1379,6 +1386,8 @@ static void xennet_disconnect_backend(struct netfront_info *info)
for (i = 0; i < num_queues && info->queues; ++i) {
struct netfront_queue *queue = &info->queues[i];
+ del_timer_sync(&queue->rx_refill_timer);
+
if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
unbind_from_irqhandler(queue->tx_irq, queue);
if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
@@ -1733,7 +1742,6 @@ static void xennet_destroy_queues(struct netfront_info *info)
if (netif_running(info->netdev))
napi_disable(&queue->napi);
- del_timer_sync(&queue->rx_refill_timer);
netif_napi_del(&queue->napi);
}
@@ -1822,27 +1830,19 @@ static int talk_to_netback(struct xenbus_device *dev,
xennet_destroy_queues(info);
err = xennet_create_queues(info, &num_queues);
- if (err < 0)
- goto destroy_ring;
+ if (err < 0) {
+ xenbus_dev_fatal(dev, err, "creating queues");
+ kfree(info->queues);
+ info->queues = NULL;
+ goto out;
+ }
/* Create shared ring, alloc event channel -- for each queue */
for (i = 0; i < num_queues; ++i) {
queue = &info->queues[i];
err = setup_netfront(dev, queue, feature_split_evtchn);
- if (err) {
- /* setup_netfront() will tidy up the current
- * queue on error, but we need to clean up
- * those already allocated.
- */
- if (i > 0) {
- rtnl_lock();
- netif_set_real_num_tx_queues(info->netdev, i);
- rtnl_unlock();
- goto destroy_ring;
- } else {
- goto out;
- }
- }
+ if (err)
+ goto destroy_ring;
}
again:
@@ -1932,9 +1932,10 @@ abort_transaction_no_dev_fatal:
xenbus_transaction_end(xbt, 1);
destroy_ring:
xennet_disconnect_backend(info);
- kfree(info->queues);
- info->queues = NULL;
+ xennet_destroy_queues(info);
out:
+ unregister_netdev(info->netdev);
+ xennet_free_netdev(info->netdev);
return err;
}
@@ -2164,11 +2165,12 @@ static int __init netif_init(void)
pr_info("Initialising Xen virtual ethernet driver\n");
- /* Allow as many queues as there are CPUs if user has not
+ /* Allow as many queues as there are CPUs inut max. 8 if user has not
* specified a value.
*/
if (xennet_max_queues == 0)
- xennet_max_queues = num_online_cpus();
+ xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
+ num_online_cpus());
return xenbus_register_frontend(&netfront_driver);
}