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mac80211: add offset_tsf driver op and use it for mesh

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This allows the mesh sync (and debugfs) code to make incremental
TSF adjustments, avoiding any uncertainty introduced by delay in
programming absolute TSF.

Signed-off-by: Thomas Pedersen <twp@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Pedersen, Thomas 2016-09-28 16:56:28 -07:00 committed by Johannes Berg
parent 3ff23cd565
commit 354d381baf
6 changed files with 68 additions and 6 deletions
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8
include/net/mac80211.h
View file

@ -3169,6 +3169,12 @@ enum ieee80211_reconfig_type {
* required function.
* The callback can sleep.
*
* @offset_tsf: Offset the TSF timer by the specified value in the
* firmware/hardware. Preferred to set_tsf as it avoids delay between
* calling set_tsf() and hardware getting programmed, which will show up
* as TSF delay. Is not a required function.
* The callback can sleep.
*
* @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize
* with other STAs in the IBSS. This is only used in IBSS mode. This
* function is optional if the firmware/hardware takes full care of
@ -3549,6 +3555,8 @@ struct ieee80211_ops {
u64 (*get_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
void (*set_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
u64 tsf);
void (*offset_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
s64 offset);
void (*reset_tsf)(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
int (*tx_last_beacon)(struct ieee80211_hw *hw);
int (*ampdu_action)(struct ieee80211_hw *hw,

12
net/mac80211/debugfs_netdev.c
View file

@ -556,9 +556,15 @@ static ssize_t ieee80211_if_parse_tsf(
ret = kstrtoull(buf, 10, &tsf);
if (ret < 0)
return ret;
if (tsf_is_delta)
tsf = drv_get_tsf(local, sdata) + tsf_is_delta * tsf;
if (local->ops->set_tsf) {
if (tsf_is_delta && local->ops->offset_tsf) {
drv_offset_tsf(local, sdata, tsf_is_delta * tsf);
wiphy_info(local->hw.wiphy,
"debugfs offset TSF by %018lld\n",
tsf_is_delta * tsf);
} else if (local->ops->set_tsf) {
if (tsf_is_delta)
tsf = drv_get_tsf(local, sdata) +
tsf_is_delta * tsf;
drv_set_tsf(local, sdata, tsf);
wiphy_info(local->hw.wiphy,
"debugfs set TSF to %#018llx\n", tsf);

15
net/mac80211/driver-ops.c
View file

@ -215,6 +215,21 @@ void drv_set_tsf(struct ieee80211_local *local,
trace_drv_return_void(local);
}
void drv_offset_tsf(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
s64 offset)
{
might_sleep();
if (!check_sdata_in_driver(sdata))
return;
trace_drv_offset_tsf(local, sdata, offset);
if (local->ops->offset_tsf)
local->ops->offset_tsf(&local->hw, &sdata->vif, offset);
trace_drv_return_void(local);
}
void drv_reset_tsf(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{

3
net/mac80211/driver-ops.h
View file

@ -569,6 +569,9 @@ u64 drv_get_tsf(struct ieee80211_local *local,
void drv_set_tsf(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
u64 tsf);
void drv_offset_tsf(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
s64 offset);
void drv_reset_tsf(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata);

10
net/mac80211/mesh_sync.c
View file

@ -70,9 +70,13 @@ void mesh_sync_adjust_tbtt(struct ieee80211_sub_if_data *sdata)
}
spin_unlock_bh(&ifmsh->sync_offset_lock);
tsf = drv_get_tsf(local, sdata);
if (tsf != -1ULL)
drv_set_tsf(local, sdata, tsf + tsfdelta);
if (local->ops->offset_tsf) {
drv_offset_tsf(local, sdata, tsfdelta);
} else {
tsf = drv_get_tsf(local, sdata);
if (tsf != -1ULL)
drv_set_tsf(local, sdata, tsf + tsfdelta);
}
}
static void mesh_sync_offset_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,

26
net/mac80211/trace.h
View file

@ -984,6 +984,32 @@ TRACE_EVENT(drv_set_tsf,
)
);
TRACE_EVENT(drv_offset_tsf,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
s64 offset),
TP_ARGS(local, sdata, offset),
TP_STRUCT__entry(
LOCAL_ENTRY
VIF_ENTRY
__field(s64, tsf_offset)
),
TP_fast_assign(
LOCAL_ASSIGN;
VIF_ASSIGN;
__entry->tsf_offset = offset;
),
TP_printk(
LOCAL_PR_FMT VIF_PR_FMT " tsf offset:%lld",
LOCAL_PR_ARG, VIF_PR_ARG,
(unsigned long long)__entry->tsf_offset
)
);
DEFINE_EVENT(local_sdata_evt, drv_reset_tsf,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata),