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rps: add CONFIG_RPS

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RPS currently depends on SMP and SYSFS

Adding a CONFIG_RPS makes sense in case this requirement changes in the
future. This patch saves about 1500 bytes of kernel text in case SMP is
on but SYSFS is off.

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 2010-03-24 19:13:54 +00:00 committed by David S. Miller
parent 2381a55c88
commit df3345457a
3 changed files with 28 additions and 10 deletions
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4
include/linux/netdevice.h
View File

@ -531,6 +531,7 @@ struct netdev_queue {
unsigned long tx_dropped;
} ____cacheline_aligned_in_smp;
#ifdef CONFIG_RPS
/*
* This structure holds an RPS map which can be of variable length. The
* map is an array of CPUs.
@ -549,6 +550,7 @@ struct netdev_rx_queue {
struct netdev_rx_queue *first;
atomic_t count;
} ____cacheline_aligned_in_smp;
#endif
/*
* This structure defines the management hooks for network devices.
@ -897,12 +899,14 @@ struct net_device {
unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
#ifdef CONFIG_RPS
struct kset *queues_kset;
struct netdev_rx_queue *_rx;
/* Number of RX queues allocated at alloc_netdev_mq() time */
unsigned int num_rx_queues;
#endif
struct netdev_queue rx_queue;

5
net/Kconfig
View File

@ -203,6 +203,11 @@ source "net/ieee802154/Kconfig"
source "net/sched/Kconfig"
source "net/dcb/Kconfig"
config RPS
boolean
depends on SMP && SYSFS
default y
menu "Network testing"
config NET_PKTGEN

29
net/core/dev.c
View File

@ -2177,7 +2177,7 @@ int weight_p __read_mostly = 64; /* old backlog weight */
DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
/*
* get_rps_cpu is called from netif_receive_skb and returns the target
* CPU from the RPS map of the receiving queue for a given skb.
@ -2325,7 +2325,7 @@ enqueue:
/* Schedule NAPI for backlog device */
if (napi_schedule_prep(&queue->backlog)) {
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
if (cpu != smp_processor_id()) {
struct rps_remote_softirq_cpus *rcpus =
&__get_cpu_var(rps_remote_softirq_cpus);
@ -2376,7 +2376,7 @@ int netif_rx(struct sk_buff *skb)
if (!skb->tstamp.tv64)
net_timestamp(skb);
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
cpu = get_rps_cpu(skb->dev, skb);
if (cpu < 0)
cpu = smp_processor_id();
@ -2750,7 +2750,7 @@ out:
*/
int netif_receive_skb(struct sk_buff *skb)
{
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
int cpu;
cpu = get_rps_cpu(skb->dev, skb);
@ -3189,7 +3189,7 @@ void netif_napi_del(struct napi_struct *napi)
}
EXPORT_SYMBOL(netif_napi_del);
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
/*
* net_rps_action sends any pending IPI's for rps. This is only called from
* softirq and interrupts must be enabled.
@ -3214,7 +3214,7 @@ static void net_rx_action(struct softirq_action *h)
unsigned long time_limit = jiffies + 2;
int budget = netdev_budget;
void *have;
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
int select;
struct rps_remote_softirq_cpus *rcpus;
#endif
@ -3280,7 +3280,7 @@ static void net_rx_action(struct softirq_action *h)
netpoll_poll_unlock(have);
}
out:
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
rcpus = &__get_cpu_var(rps_remote_softirq_cpus);
select = rcpus->select;
rcpus->select ^= 1;
@ -5277,6 +5277,7 @@ 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
@ -5293,7 +5294,7 @@ int register_netdevice(struct net_device *dev)
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);
@ -5653,11 +5654,13 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
void (*setup)(struct net_device *), unsigned int queue_count)
{
struct netdev_queue *tx;
struct netdev_rx_queue *rx;
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));
@ -5683,6 +5686,7 @@ 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 "
@ -5698,6 +5702,7 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
*/
for (i = 0; i < queue_count; i++)
rx[i].first = rx;
#endif
dev = PTR_ALIGN(p, NETDEV_ALIGN);
dev->padded = (char *)dev - (char *)p;
@ -5713,8 +5718,10 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
dev->num_tx_queues = queue_count;
dev->real_num_tx_queues = queue_count;
#ifdef CONFIG_RPS
dev->_rx = rx;
dev->num_rx_queues = queue_count;
#endif
dev->gso_max_size = GSO_MAX_SIZE;
@ -5731,8 +5738,10 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
return dev;
free_rx:
#ifdef CONFIG_RPS
kfree(rx);
free_tx:
#endif
kfree(tx);
free_p:
kfree(p);
@ -6236,7 +6245,7 @@ static int __init net_dev_init(void)
queue->completion_queue = NULL;
INIT_LIST_HEAD(&queue->poll_list);
#ifdef CONFIG_SMP
#ifdef CONFIG_RPS
queue->csd.func = trigger_softirq;
queue->csd.info = queue;
queue->csd.flags = 0;