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mt76: add utility functions for deferring work to a kernel thread

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In order to avoid keeping work like tx scheduling pinned to the CPU it was
scheduled from, it makes sense to switch from tasklets to kernel threads.

Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2020-08-22 15:56:57 +02:00
parent 5cf34cda70
commit 87a6942906
2 changed files with 103 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
util.c
+28
View File
@@ -110,4 +110,32 @@ int mt76_get_min_avg_rssi(struct mt76_dev *dev, bool ext_phy)
}
EXPORT_SYMBOL_GPL(mt76_get_min_avg_rssi);
int __mt76_worker_fn(void *ptr)
{
struct mt76_worker *w = ptr;
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
if (kthread_should_park()) {
kthread_parkme();
continue;
}
if (!test_and_clear_bit(MT76_WORKER_SCHEDULED, &w->state)) {
schedule();
continue;
}
set_bit(MT76_WORKER_RUNNING, &w->state);
set_current_state(TASK_RUNNING);
w->fn(w);
cond_resched();
clear_bit(MT76_WORKER_RUNNING, &w->state);
}
return 0;
}
EXPORT_SYMBOL_GPL(__mt76_worker_fn);
MODULE_LICENSE("Dual BSD/GPL");
util.h
+75
View File
@@ -10,6 +10,19 @@
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/bitfield.h>
#include <net/mac80211.h>
struct mt76_worker
{
struct task_struct *task;
void (*fn)(struct mt76_worker *);
unsigned long state;
};
enum {
MT76_WORKER_SCHEDULED,
MT76_WORKER_RUNNING,
};
#define MT76_INCR(_var, _size) \
(_var = (((_var) + 1) % (_size)))
@@ -45,4 +58,66 @@ mt76_skb_set_moredata(struct sk_buff *skb, bool enable)
hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
}
int __mt76_worker_fn(void *ptr);
static inline int
mt76_worker_setup(struct ieee80211_hw *hw, struct mt76_worker *w,
void (*fn)(struct mt76_worker *),
const char *name)
{
const char *dev_name = wiphy_name(hw->wiphy);
int ret;
w->fn = fn;
w->task = kthread_create(__mt76_worker_fn, w, "mt76-%s %s",
name, dev_name);
ret = PTR_ERR_OR_ZERO(w->task);
if (ret) {
w->task = NULL;
return ret;
}
wake_up_process(w->task);
return 0;
}
static inline void mt76_worker_schedule(struct mt76_worker *w)
{
if (!w->task)
return;
if (!test_and_set_bit(MT76_WORKER_SCHEDULED, &w->state) &&
!test_bit(MT76_WORKER_RUNNING, &w->state))
wake_up_process(w->task);
}
static inline void mt76_worker_disable(struct mt76_worker *w)
{
if (!w->task)
return;
kthread_park(w->task);
WRITE_ONCE(w->state, 0);
}
static inline void mt76_worker_enable(struct mt76_worker *w)
{
if (!w->task)
return;
kthread_unpark(w->task);
mt76_worker_schedule(w);
}
static inline void mt76_worker_teardown(struct mt76_worker *w)
{
if (!w->task)
return;
kthread_stop(w->task);
w->task = NULL;
}
#endif