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rps: cleanups 

struct softnet_data holds many queues, so consistent use "sd" name
instead of "queue" is better.

Adds a rps_ipi_queued() helper to cleanup enqueue_to_backlog()

Adds a _and_irq_disable suffix to net_rps_action() name, as David
suggested.

incr_input_queue_head() becomes input_queue_head_incr()

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 2010-04-19 21:17:14 +00:00 committed by David S. Miller
parent f5acb907dc
commit e36fa2f7e9
2 changed files with 82 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/netdevice.h
View File

@ -1401,10 +1401,10 @@ struct softnet_data {
struct napi_struct backlog;
};
static inline void incr_input_queue_head(struct softnet_data *queue)
static inline void input_queue_head_incr(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
queue->input_queue_head++;
sd->input_queue_head++;
#endif
}

149
net/core/dev.c
View File

@ -208,17 +208,17 @@ static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
}
static inline void rps_lock(struct softnet_data *queue)
static inline void rps_lock(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
spin_lock(&queue->input_pkt_queue.lock);
spin_lock(&sd->input_pkt_queue.lock);
#endif
}
static inline void rps_unlock(struct softnet_data *queue)
static inline void rps_unlock(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
spin_unlock(&queue->input_pkt_queue.lock);
spin_unlock(&sd->input_pkt_queue.lock);
#endif
}
@ -2346,14 +2346,37 @@ done:
}
/* Called from hardirq (IPI) context */
static void trigger_softirq(void *data)
static void rps_trigger_softirq(void *data)
{
struct softnet_data *queue = data;
__napi_schedule(&queue->backlog);
struct softnet_data *sd = data;
__napi_schedule(&sd->backlog);
__get_cpu_var(netdev_rx_stat).received_rps++;
}
#endif /* CONFIG_RPS */
/*
* Check if this softnet_data structure is another cpu one
* If yes, queue it to our IPI list and return 1
* If no, return 0
*/
static int rps_ipi_queued(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
struct softnet_data *mysd = &__get_cpu_var(softnet_data);
if (sd != mysd) {
sd->rps_ipi_next = mysd->rps_ipi_list;
mysd->rps_ipi_list = sd;
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
return 1;
}
#endif /* CONFIG_RPS */
return 0;
}
/*
* enqueue_to_backlog is called to queue an skb to a per CPU backlog
* queue (may be a remote CPU queue).
@ -2361,48 +2384,36 @@ static void trigger_softirq(void *data)
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
unsigned int *qtail)
{
struct softnet_data *queue;
struct softnet_data *sd;
unsigned long flags;
queue = &per_cpu(softnet_data, cpu);
sd = &per_cpu(softnet_data, cpu);
local_irq_save(flags);
__get_cpu_var(netdev_rx_stat).total++;
rps_lock(queue);
if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
if (queue->input_pkt_queue.qlen) {
rps_lock(sd);
if (sd->input_pkt_queue.qlen <= netdev_max_backlog) {
if (sd->input_pkt_queue.qlen) {
enqueue:
__skb_queue_tail(&queue->input_pkt_queue, skb);
__skb_queue_tail(&sd->input_pkt_queue, skb);
#ifdef CONFIG_RPS
*qtail = queue->input_queue_head +
queue->input_pkt_queue.qlen;
*qtail = sd->input_queue_head + sd->input_pkt_queue.qlen;
#endif
rps_unlock(queue);
rps_unlock(sd);
local_irq_restore(flags);
return NET_RX_SUCCESS;
}
/* Schedule NAPI for backlog device */
if (napi_schedule_prep(&queue->backlog)) {
#ifdef CONFIG_RPS
if (cpu != smp_processor_id()) {
struct softnet_data *myqueue;
myqueue = &__get_cpu_var(softnet_data);
queue->rps_ipi_next = myqueue->rps_ipi_list;
myqueue->rps_ipi_list = queue;
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
goto enqueue;
}
#endif
__napi_schedule(&queue->backlog);
if (napi_schedule_prep(&sd->backlog)) {
if (!rps_ipi_queued(sd))
__napi_schedule(&sd->backlog);
}
goto enqueue;
}
rps_unlock(queue);
rps_unlock(sd);
__get_cpu_var(netdev_rx_stat).dropped++;
local_irq_restore(flags);
@ -2903,17 +2914,17 @@ EXPORT_SYMBOL(netif_receive_skb);
static void flush_backlog(void *arg)
{
struct net_device *dev = arg;
struct softnet_data *queue = &__get_cpu_var(softnet_data);
struct softnet_data *sd = &__get_cpu_var(softnet_data);
struct sk_buff *skb, *tmp;
rps_lock(queue);
skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
rps_lock(sd);
skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp)
if (skb->dev == dev) {
__skb_unlink(skb, &queue->input_pkt_queue);
__skb_unlink(skb, &sd->input_pkt_queue);
kfree_skb(skb);
incr_input_queue_head(queue);
input_queue_head_incr(sd);
}
rps_unlock(queue);
rps_unlock(sd);
}
static int napi_gro_complete(struct sk_buff *skb)
@ -3219,23 +3230,23 @@ EXPORT_SYMBOL(napi_gro_frags);
static int process_backlog(struct napi_struct *napi, int quota)
{
int work = 0;
struct softnet_data *queue = &__get_cpu_var(softnet_data);
struct softnet_data *sd = &__get_cpu_var(softnet_data);
napi->weight = weight_p;
do {
struct sk_buff *skb;
local_irq_disable();
rps_lock(queue);
skb = __skb_dequeue(&queue->input_pkt_queue);
rps_lock(sd);
skb = __skb_dequeue(&sd->input_pkt_queue);
if (!skb) {
__napi_complete(napi);
rps_unlock(queue);
rps_unlock(sd);
local_irq_enable();
break;
}
incr_input_queue_head(queue);
rps_unlock(queue);
input_queue_head_incr(sd);
rps_unlock(sd);
local_irq_enable();
__netif_receive_skb(skb);
@ -3331,24 +3342,25 @@ EXPORT_SYMBOL(netif_napi_del);
* net_rps_action sends any pending IPI's for rps.
* Note: called with local irq disabled, but exits with local irq enabled.
*/
static void net_rps_action(void)
static void net_rps_action_and_irq_disable(void)
{
#ifdef CONFIG_RPS
struct softnet_data *locqueue = &__get_cpu_var(softnet_data);
struct softnet_data *remqueue = locqueue->rps_ipi_list;
struct softnet_data *sd = &__get_cpu_var(softnet_data);
struct softnet_data *remsd = sd->rps_ipi_list;
if (remqueue) {
locqueue->rps_ipi_list = NULL;
if (remsd) {
sd->rps_ipi_list = NULL;
local_irq_enable();
/* Send pending IPI's to kick RPS processing on remote cpus. */
while (remqueue) {
struct softnet_data *next = remqueue->rps_ipi_next;
if (cpu_online(remqueue->cpu))
__smp_call_function_single(remqueue->cpu,
&remqueue->csd, 0);
remqueue = next;
while (remsd) {
struct softnet_data *next = remsd->rps_ipi_next;
if (cpu_online(remsd->cpu))
__smp_call_function_single(remsd->cpu,
&remsd->csd, 0);
remsd = next;
}
} else
#endif
@ -3423,7 +3435,7 @@ static void net_rx_action(struct softirq_action *h)
netpoll_poll_unlock(have);
}
out:
net_rps_action();
net_rps_action_and_irq_disable();
#ifdef CONFIG_NET_DMA
/*
@ -5595,7 +5607,7 @@ static int dev_cpu_callback(struct notifier_block *nfb,
/* Process offline CPU's input_pkt_queue */
while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
netif_rx(skb);
incr_input_queue_head(oldsd);
input_queue_head_incr(oldsd);
}
return NOTIFY_OK;
@ -5812,24 +5824,23 @@ static int __init net_dev_init(void)
*/
for_each_possible_cpu(i) {
struct softnet_data *queue;
struct softnet_data *sd = &per_cpu(softnet_data, i);
queue = &per_cpu(softnet_data, i);
skb_queue_head_init(&queue->input_pkt_queue);
queue->completion_queue = NULL;
INIT_LIST_HEAD(&queue->poll_list);
skb_queue_head_init(&sd->input_pkt_queue);
sd->completion_queue = NULL;
INIT_LIST_HEAD(&sd->poll_list);
#ifdef CONFIG_RPS
queue->csd.func = trigger_softirq;
queue->csd.info = queue;
queue->csd.flags = 0;
queue->cpu = i;
sd->csd.func = rps_trigger_softirq;
sd->csd.info = sd;
sd->csd.flags = 0;
sd->cpu = i;
#endif
queue->backlog.poll = process_backlog;
queue->backlog.weight = weight_p;
queue->backlog.gro_list = NULL;
queue->backlog.gro_count = 0;
sd->backlog.poll = process_backlog;
sd->backlog.weight = weight_p;
sd->backlog.gro_list = NULL;
sd->backlog.gro_count = 0;
}
dev_boot_phase = 0;