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mac80211: allow software PS-Poll/U-APSD with AP_LINK_PS 

When using RSS, frames might not be processed in the correct order,
and thus AP_LINK_PS must be used; most likely with firmware keeping
track of the powersave state, this is the case in iwlwifi now.

In this case, the driver can use ieee80211_sta_ps_transition() to
still have mac80211 manage powersave buffering. However, for U-APSD
and PS-Poll this isn't sufficient. If the device can't manage that
entirely on its own, mac80211's code should be used.

To allow this, export two functions: ieee80211_sta_uapsd_trigger()
and ieee80211_sta_pspoll().

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-05-03 16:58:00 +03:00
parent 53873f134d
commit 46fa38e84b
2 changed files with 71 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
include/net/mac80211.h
View File

@ -3996,6 +3996,33 @@ static inline int ieee80211_sta_ps_transition_ni(struct ieee80211_sta *sta,
return ret;
}
/**
* ieee80211_sta_pspoll - PS-Poll frame received
* @sta: currently connected station
*
* When operating in AP mode with the %IEEE80211_HW_AP_LINK_PS flag set,
* use this function to inform mac80211 that a PS-Poll frame from a
* connected station was received.
* This must be used in conjunction with ieee80211_sta_ps_transition()
* and possibly ieee80211_sta_uapsd_trigger(); calls to all three must
* be serialized.
*/
void ieee80211_sta_pspoll(struct ieee80211_sta *sta);
/**
* ieee80211_sta_uapsd_trigger - (potential) U-APSD trigger frame received
* @sta: currently connected station
* @tid: TID of the received (potential) trigger frame
*
* When operating in AP mode with the %IEEE80211_HW_AP_LINK_PS flag set,
* use this function to inform mac80211 that a (potential) trigger frame
* from a connected station was received.
* This must be used in conjunction with ieee80211_sta_ps_transition()
* and possibly ieee80211_sta_pspoll(); calls to all three must be
* serialized.
*/
void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *sta, u8 tid);
/*
* The TX headroom reserved by mac80211 for its own tx_status functions.
* This is enough for the radiotap header.

70
net/mac80211/rx.c
View File

@ -1319,13 +1319,52 @@ int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
}
EXPORT_SYMBOL(ieee80211_sta_ps_transition);
void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
if (test_sta_flag(sta, WLAN_STA_SP))
return;
if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_poll_response(sta);
else
set_sta_flag(sta, WLAN_STA_PSPOLL);
}
EXPORT_SYMBOL(ieee80211_sta_pspoll);
void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
u8 ac = ieee802_1d_to_ac[tid & 7];
/*
* If this AC is not trigger-enabled do nothing.
*
* NB: This could/should check a separate bitmap of trigger-
* enabled queues, but for now we only implement uAPSD w/o
* TSPEC changes to the ACs, so they're always the same.
*/
if (!(sta->sta.uapsd_queues & BIT(ac)))
return;
/* if we are in a service period, do nothing */
if (test_sta_flag(sta, WLAN_STA_SP))
return;
if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_uapsd(sta);
else
set_sta_flag(sta, WLAN_STA_UAPSD);
}
EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger);
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
{
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_hdr *hdr = (void *)rx->skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
int tid, ac;
if (!rx->sta)
return RX_CONTINUE;
@ -1351,12 +1390,7 @@ ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
return RX_CONTINUE;
if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_poll_response(rx->sta);
else
set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
}
ieee80211_sta_pspoll(&rx->sta->sta);
/* Free PS Poll skb here instead of returning RX_DROP that would
* count as an dropped frame. */
@ -1368,27 +1402,11 @@ ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
ieee80211_has_pm(hdr->frame_control) &&
(ieee80211_is_data_qos(hdr->frame_control) ||
ieee80211_is_qos_nullfunc(hdr->frame_control))) {
u8 tid;
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
ac = ieee802_1d_to_ac[tid & 7];
/*
* If this AC is not trigger-enabled do nothing.
*
* NB: This could/should check a separate bitmap of trigger-
* enabled queues, but for now we only implement uAPSD w/o
* TSPEC changes to the ACs, so they're always the same.
*/
if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
return RX_CONTINUE;
/* if we are in a service period, do nothing */
if (test_sta_flag(rx->sta, WLAN_STA_SP))
return RX_CONTINUE;
if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
ieee80211_sta_ps_deliver_uapsd(rx->sta);
else
set_sta_flag(rx->sta, WLAN_STA_UAPSD);
ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid);
}
return RX_CONTINUE;