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Date: Thu, 28 Oct 2010 10:45:45 -0700 (PDT)
From: Tom Herbert <therbert@...gle.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH] net: Allocate RX and TX queues in alloc_netdev_mq
Both TX and RX queue allocations in the netdev structure had been moved
to register_device with the idea that the number of queues could be
changed between device allocation and registration. It was determined
that changing the num_queues after the call to alloc_netdev_mq was not
a good idea, so that was abandoned. Also, some drivers call
netif_queue_start without registering device, which causes panic
when dev->_tx queue structure is accessed. This patch moves queue
allocations back to alloc_netdev_mq to fix these issues.
Signed-off-by: Tom Herbert <therbert@...gle.com>
---
net/core/dev.c | 38 ++++++++++++++++++--------------------
1 files changed, 18 insertions(+), 20 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index b2269ac..1f729d6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5009,10 +5009,10 @@ void netif_stacked_transfer_operstate(const struct net_device *rootdev,
}
EXPORT_SYMBOL(netif_stacked_transfer_operstate);
-static int netif_alloc_rx_queues(struct net_device *dev)
+static int netif_alloc_rx_queues(struct net_device *dev, int count)
{
#ifdef CONFIG_RPS
- unsigned int i, count = dev->num_rx_queues;
+ int i;
struct netdev_rx_queue *rx;
BUG_ON(count < 1);
@@ -5030,13 +5030,15 @@ static int netif_alloc_rx_queues(struct net_device *dev)
*/
for (i = 0; i < count; i++)
rx[i].first = rx;
+
+ dev->num_rx_queues = count;
+ dev->real_num_rx_queues = count;
#endif
return 0;
}
-static int netif_alloc_netdev_queues(struct net_device *dev)
+static int netif_alloc_netdev_queues(struct net_device *dev, int count)
{
- unsigned int count = dev->num_tx_queues;
struct netdev_queue *tx;
BUG_ON(count < 1);
@@ -5048,6 +5050,10 @@ static int netif_alloc_netdev_queues(struct net_device *dev)
return -ENOMEM;
}
dev->_tx = tx;
+
+ dev->num_tx_queues = count;
+ dev->real_num_tx_queues = count;
+
return 0;
}
@@ -5105,14 +5111,6 @@ int register_netdevice(struct net_device *dev)
dev->iflink = -1;
- ret = netif_alloc_rx_queues(dev);
- if (ret)
- goto out;
-
- ret = netif_alloc_netdev_queues(dev);
- if (ret)
- goto out;
-
netdev_init_queues(dev);
/* Init, if this function is available */
@@ -5558,6 +5556,12 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
dev = PTR_ALIGN(p, NETDEV_ALIGN);
dev->padded = (char *)dev - (char *)p;
+ if (netif_alloc_netdev_queues(dev, queue_count))
+ goto free_p;
+
+ if (netif_alloc_rx_queues(dev, queue_count))
+ goto free_p;
+
dev->pcpu_refcnt = alloc_percpu(int);
if (!dev->pcpu_refcnt)
goto free_p;
@@ -5570,14 +5574,6 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
dev_net_set(dev, &init_net);
- dev->num_tx_queues = queue_count;
- dev->real_num_tx_queues = queue_count;
-
-#ifdef CONFIG_RPS
- dev->num_rx_queues = queue_count;
- dev->real_num_rx_queues = queue_count;
-#endif
-
dev->gso_max_size = GSO_MAX_SIZE;
INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
@@ -5593,6 +5589,8 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
free_pcpu:
free_percpu(dev->pcpu_refcnt);
free_p:
+ kfree(dev->_tx);
+ kfree(dev->_rx);
kfree(p);
return NULL;
}
--
1.7.3.1
--
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