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mac80211: implement hardware offload for remain-on-channel 

This allows drivers to support remain-on-channel
offload if they implement smarter timing or need
to use a device implementation like iwlwifi.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-12-18 17:20:47 +01:00 committed by John W. Linville
parent c96e96354a
commit 21f8358964
8 changed files with 306 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/net/mac80211.h
View File

@ -365,6 +365,7 @@ enum mac80211_tx_control_flags {
IEEE80211_TX_INTFL_NL80211_FRAME_TX = BIT(21),
IEEE80211_TX_CTL_LDPC = BIT(22),
IEEE80211_TX_CTL_STBC = BIT(23) | BIT(24),
IEEE80211_TX_CTL_TX_OFFCHAN = BIT(25),
};
#define IEEE80211_TX_CTL_STBC_SHIFT 23
@ -1824,6 +1825,12 @@ struct ieee80211_ops {
int (*napi_poll)(struct ieee80211_hw *hw, int budget);
int (*set_antenna)(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant);
int (*get_antenna)(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant);
int (*remain_on_channel)(struct ieee80211_hw *hw,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type,
int duration);
int (*cancel_remain_on_channel)(struct ieee80211_hw *hw);
};
/**
@ -2729,6 +2736,18 @@ void ieee80211_request_smps(struct ieee80211_vif *vif,
*/
void ieee80211_key_removed(struct ieee80211_key_conf *key_conf);
/**
* ieee80211_ready_on_channel - notification of remain-on-channel start
* @hw: pointer as obtained from ieee80211_alloc_hw()
*/
void ieee80211_ready_on_channel(struct ieee80211_hw *hw);
/**
* ieee80211_remain_on_channel_expired - remain_on_channel duration expired
* @hw: pointer as obtained from ieee80211_alloc_hw()
*/
void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw);
/* Rate control API */
/**

83
net/mac80211/cfg.c
View File

@ -1593,6 +1593,37 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
return 0;
}
static int ieee80211_remain_on_channel_hw(struct ieee80211_local *local,
struct net_device *dev,
struct ieee80211_channel *chan,
enum nl80211_channel_type chantype,
unsigned int duration, u64 *cookie)
{
int ret;
u32 random_cookie;
lockdep_assert_held(&local->mtx);
if (local->hw_roc_cookie)
return -EBUSY;
/* must be nonzero */
random_cookie = random32() | 1;
*cookie = random_cookie;
local->hw_roc_dev = dev;
local->hw_roc_cookie = random_cookie;
local->hw_roc_channel = chan;
local->hw_roc_channel_type = chantype;
local->hw_roc_duration = duration;
ret = drv_remain_on_channel(local, chan, chantype, duration);
if (ret) {
local->hw_roc_channel = NULL;
local->hw_roc_cookie = 0;
}
return ret;
}
static int ieee80211_remain_on_channel(struct wiphy *wiphy,
struct net_device *dev,
struct ieee80211_channel *chan,
@ -1601,16 +1632,62 @@ static int ieee80211_remain_on_channel(struct wiphy *wiphy,
u64 *cookie)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
if (local->ops->remain_on_channel) {
int ret;
mutex_lock(&local->mtx);
ret = ieee80211_remain_on_channel_hw(local, dev,
chan, channel_type,
duration, cookie);
mutex_unlock(&local->mtx);
return ret;
}
return ieee80211_wk_remain_on_channel(sdata, chan, channel_type,
duration, cookie);
}
static int ieee80211_cancel_remain_on_channel_hw(struct ieee80211_local *local,
u64 cookie)
{
int ret;
lockdep_assert_held(&local->mtx);
if (local->hw_roc_cookie != cookie)
return -ENOENT;
ret = drv_cancel_remain_on_channel(local);
if (ret)
return ret;
local->hw_roc_cookie = 0;
local->hw_roc_channel = NULL;
ieee80211_recalc_idle(local);
return 0;
}
static int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy,
struct net_device *dev,
u64 cookie)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
if (local->ops->cancel_remain_on_channel) {
int ret;
mutex_lock(&local->mtx);
ret = ieee80211_cancel_remain_on_channel_hw(local, cookie);
mutex_unlock(&local->mtx);
return ret;
}
return ieee80211_wk_cancel_remain_on_channel(sdata, cookie);
}
@ -1662,6 +1739,12 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
channel_type != local->_oper_channel_type))
is_offchan = true;
if (chan == local->hw_roc_channel) {
/* TODO: check channel type? */
is_offchan = false;
flags |= IEEE80211_TX_CTL_TX_OFFCHAN;
}
if (is_offchan && !offchan)
return -EBUSY;

30
net/mac80211/driver-ops.h
View File

@ -465,4 +465,34 @@ static inline int drv_get_antenna(struct ieee80211_local *local,
return ret;
}
static inline int drv_remain_on_channel(struct ieee80211_local *local,
struct ieee80211_channel *chan,
enum nl80211_channel_type chantype,
unsigned int duration)
{
int ret;
might_sleep();
trace_drv_remain_on_channel(local, chan, chantype, duration);
ret = local->ops->remain_on_channel(&local->hw, chan, chantype,
duration);
trace_drv_return_int(local, ret);
return ret;
}
static inline int drv_cancel_remain_on_channel(struct ieee80211_local *local)
{
int ret;
might_sleep();
trace_drv_cancel_remain_on_channel(local);
ret = local->ops->cancel_remain_on_channel(&local->hw);
trace_drv_return_int(local, ret);
return ret;
}
#endif /* __MAC80211_DRIVER_OPS */

80
net/mac80211/driver-trace.h
View File

@ -933,6 +933,50 @@ TRACE_EVENT(drv_get_antenna,
)
);
TRACE_EVENT(drv_remain_on_channel,
TP_PROTO(struct ieee80211_local *local, struct ieee80211_channel *chan,
enum nl80211_channel_type chantype, unsigned int duration),
TP_ARGS(local, chan, chantype, duration),
TP_STRUCT__entry(
LOCAL_ENTRY
__field(int, center_freq)
__field(int, channel_type)
__field(unsigned int, duration)
),
TP_fast_assign(
LOCAL_ASSIGN;
__entry->center_freq = chan->center_freq;
__entry->channel_type = chantype;
__entry->duration = duration;
),
TP_printk(
LOCAL_PR_FMT " freq:%dMHz duration:%dms",
LOCAL_PR_ARG, __entry->center_freq, __entry->duration
)
);
TRACE_EVENT(drv_cancel_remain_on_channel,
TP_PROTO(struct ieee80211_local *local),
TP_ARGS(local),
TP_STRUCT__entry(
LOCAL_ENTRY
),
TP_fast_assign(
LOCAL_ASSIGN;
),
TP_printk(
LOCAL_PR_FMT, LOCAL_PR_ARG
)
);
/*
* Tracing for API calls that drivers call.
*/
@ -1170,6 +1214,42 @@ TRACE_EVENT(api_chswitch_done,
)
);
TRACE_EVENT(api_ready_on_channel,
TP_PROTO(struct ieee80211_local *local),
TP_ARGS(local),
TP_STRUCT__entry(
LOCAL_ENTRY
),
TP_fast_assign(
LOCAL_ASSIGN;
),
TP_printk(
LOCAL_PR_FMT, LOCAL_PR_ARG
)
);
TRACE_EVENT(api_remain_on_channel_expired,
TP_PROTO(struct ieee80211_local *local),
TP_ARGS(local),
TP_STRUCT__entry(
LOCAL_ENTRY
),
TP_fast_assign(
LOCAL_ASSIGN;
),
TP_printk(
LOCAL_PR_FMT, LOCAL_PR_ARG
)
);
/*
* Tracing for internal functions
* (which may also be called in response to driver calls)

8
net/mac80211/ieee80211_i.h
View File

@ -951,6 +951,13 @@ struct ieee80211_local {
} debugfs;
#endif
struct ieee80211_channel *hw_roc_channel;
struct net_device *hw_roc_dev;
struct work_struct hw_roc_start, hw_roc_done;
enum nl80211_channel_type hw_roc_channel_type;
unsigned int hw_roc_duration;
u32 hw_roc_cookie;
/* dummy netdev for use w/ NAPI */
struct net_device napi_dev;
@ -1142,6 +1149,7 @@ void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local);
void ieee80211_offchannel_stop_station(struct ieee80211_local *local);
void ieee80211_offchannel_return(struct ieee80211_local *local,
bool enable_beaconing);
void ieee80211_hw_roc_setup(struct ieee80211_local *local);
/* interface handling */
int ieee80211_iface_init(void);

9
net/mac80211/iface.c
View File

@ -1264,7 +1264,7 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
int count = 0;
bool working = false, scanning = false;
bool working = false, scanning = false, hw_roc = false;
struct ieee80211_work *wk;
unsigned int led_trig_start = 0, led_trig_stop = 0;
@ -1308,6 +1308,9 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
local->scan_sdata->vif.bss_conf.idle = false;
}
if (local->hw_roc_channel)
hw_roc = true;
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->old_idle == sdata->vif.bss_conf.idle)
continue;
@ -1316,7 +1319,7 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
}
if (working || scanning)
if (working || scanning || hw_roc)
led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
else
led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
@ -1328,6 +1331,8 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
if (hw_roc)
return ieee80211_idle_off(local, "hw remain-on-channel");
if (working)
return ieee80211_idle_off(local, "working");
if (scanning)

5
net/mac80211/main.c
View File

@ -609,6 +609,8 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
ieee80211_led_names(local);
ieee80211_hw_roc_setup(local);
return local_to_hw(local);
}
EXPORT_SYMBOL(ieee80211_alloc_hw);
@ -753,7 +755,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
}
}
local->hw.wiphy->max_remain_on_channel_duration = 5000;
if (!local->ops->remain_on_channel)
local->hw.wiphy->max_remain_on_channel_duration = 5000;
result = wiphy_register(local->hw.wiphy);
if (result < 0)

75
net/mac80211/offchannel.c
View File

@ -14,6 +14,7 @@
*/
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-trace.h"
/*
* inform AP that we will go to sleep so that it will buffer the frames
@ -190,3 +191,77 @@ void ieee80211_offchannel_return(struct ieee80211_local *local,
}
mutex_unlock(&local->iflist_mtx);
}
static void ieee80211_hw_roc_start(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, hw_roc_start);
mutex_lock(&local->mtx);
if (!local->hw_roc_channel) {
mutex_unlock(&local->mtx);
return;
}
ieee80211_recalc_idle(local);
cfg80211_ready_on_channel(local->hw_roc_dev, local->hw_roc_cookie,
local->hw_roc_channel,
local->hw_roc_channel_type,
local->hw_roc_duration,
GFP_KERNEL);
mutex_unlock(&local->mtx);
}
void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
trace_api_ready_on_channel(local);
ieee80211_queue_work(hw, &local->hw_roc_start);
}
EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
static void ieee80211_hw_roc_done(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, hw_roc_done);
mutex_lock(&local->mtx);
if (!local->hw_roc_channel) {
mutex_unlock(&local->mtx);
return;
}
cfg80211_remain_on_channel_expired(local->hw_roc_dev,
local->hw_roc_cookie,
local->hw_roc_channel,
local->hw_roc_channel_type,
GFP_KERNEL);
local->hw_roc_channel = NULL;
local->hw_roc_cookie = 0;
ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
}
void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
trace_api_remain_on_channel_expired(local);
ieee80211_queue_work(hw, &local->hw_roc_done);
}
EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
void ieee80211_hw_roc_setup(struct ieee80211_local *local)
{
INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
}