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rps: allocate rx queues in register_netdevice only 

Instead of having two places were we allocate dev->_rx, introduce
netif_alloc_rx_queues() helper and call it only from
register_netdevice(), not from alloc_netdev_mq()

Goal is to let drivers change dev->num_rx_queues after allocating netdev
and before registering it.

This also removes a lot of ifdefs in net/core/dev.c

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-09-23 17:26:35 +00:00 committed by David S. Miller
parent 7a91b434e2
commit 1b4bf461f0
1 changed files with 32 additions and 44 deletions
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76
net/core/dev.c
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@ -4964,6 +4964,34 @@ 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)
{
#ifdef CONFIG_RPS
unsigned int i, count = dev->num_rx_queues;
if (count) {
struct netdev_rx_queue *rx;
rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
if (!rx) {
pr_err("netdev: Unable to allocate %u rx queues.\n",
count);
return -ENOMEM;
}
dev->_rx = rx;
atomic_set(&rx->count, count);
/*
* Set a pointer to first element in the array which holds the
* reference count.
*/
for (i = 0; i < count; i++)
rx[i].first = rx;
}
#endif
return 0;
}
/**
* register_netdevice - register a network device
* @dev: device to register
@ -5001,24 +5029,10 @@ int register_netdevice(struct net_device *dev)
dev->iflink = -1;
#ifdef CONFIG_RPS
if (!dev->num_rx_queues) {
/*
* Allocate a single RX queue if driver never called
* alloc_netdev_mq
*/
ret = netif_alloc_rx_queues(dev);
if (ret)
goto out;
dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
if (!dev->_rx) {
ret = -ENOMEM;
goto out;
}
dev->_rx->first = dev->_rx;
atomic_set(&dev->_rx->count, 1);
dev->num_rx_queues = 1;
}
#endif
/* Init, if this function is available */
if (dev->netdev_ops->ndo_init) {
ret = dev->netdev_ops->ndo_init(dev);
@ -5415,10 +5429,6 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
struct net_device *dev;
size_t alloc_size;
struct net_device *p;
#ifdef CONFIG_RPS
struct netdev_rx_queue *rx;
int i;
#endif
BUG_ON(strlen(name) >= sizeof(dev->name));
@ -5444,29 +5454,12 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
goto free_p;
}
#ifdef CONFIG_RPS
rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
if (!rx) {
printk(KERN_ERR "alloc_netdev: Unable to allocate "
"rx queues.\n");
goto free_tx;
}
atomic_set(&rx->count, queue_count);
/*
* Set a pointer to first element in the array which holds the
* reference count.
*/
for (i = 0; i < queue_count; i++)
rx[i].first = rx;
#endif
dev = PTR_ALIGN(p, NETDEV_ALIGN);
dev->padded = (char *)dev - (char *)p;
if (dev_addr_init(dev))
goto free_rx;
goto free_tx;
dev_mc_init(dev);
dev_uc_init(dev);
@ -5478,7 +5471,6 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
dev->real_num_tx_queues = queue_count;
#ifdef CONFIG_RPS
dev->_rx = rx;
dev->num_rx_queues = queue_count;
#endif
@ -5496,11 +5488,7 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
strcpy(dev->name, name);
return dev;
free_rx:
#ifdef CONFIG_RPS
kfree(rx);
free_tx:
#endif
kfree(tx);
free_p:
kfree(p);