From 30bdd69246ea9726a7688ef02c60b1ec0ae66d38 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 24 Jul 2020 14:43:49 +0200 Subject: mt76: add utility functions for deferring work to a kernel thread 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. Unlike a workqueue, this one only allows one fixed worker function to be executed by the worker thread. Because of that, there is less locking and less code for scheduling involved. This is important because the tx worker is scheduled often in a hot path Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/util.h | 76 +++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) (limited to 'drivers/net/wireless/mediatek/mt76/util.h') diff --git a/drivers/net/wireless/mediatek/mt76/util.h b/drivers/net/wireless/mediatek/mt76/util.h index fd1a68820e0a..1c363ea9ab9c 100644 --- a/drivers/net/wireless/mediatek/mt76/util.h +++ b/drivers/net/wireless/mediatek/mt76/util.h @@ -10,6 +10,19 @@ #include #include #include +#include + +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 +58,67 @@ 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; + + if (fn) + 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 -- cgit v1.2.3