From: Kalle Valo <kalle.valo@xxxxxxxxx>
Add Unscheduled Automatic Power-Save Delivery (U-APSD) client support. The
idea is that the data frames from the client trigger AP to send the buffered
frames with ACs which have U-APSD enabled. This decreases latency and makes it
possible to save even more power.
Driver needs to use IEEE80211_HW_UAPSD to enable the feature. The current
implementation assumes that firmware takes care of the wakeup and
hardware needing IEEE80211_HW_PS_NULLFUNC_STACK is not yet supported.
Tested with wl1251 and Cisco Aironet 1200 AP.
Signed-off-by: Kalle Valo <kalle.valo@xxxxxxxxx>
---
include/linux/ieee80211.h | 12 ++++++++++++
include/net/mac80211.h | 6 ++++++
net/mac80211/cfg.c | 7 +++++++
net/mac80211/ieee80211_i.h | 2 ++
net/mac80211/mlme.c | 39 ++++++++++++++++++++++++++++++++++-----
net/mac80211/scan.c | 18 ++++++++++++++++++
net/mac80211/util.c | 2 ++
7 files changed, 81 insertions(+), 5 deletions(-)
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index d9724a2..b389965 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -120,6 +120,18 @@
#define IEEE80211_QOS_CTL_TID_MASK 0x000F
#define IEEE80211_QOS_CTL_TAG1D_MASK 0x0007
+/* U-APSD queues for WMM IEs sent by STA */
+#define IEEE80211_WMM_IE_STA_AC_VO (1<<0)
+#define IEEE80211_WMM_IE_STA_AC_VI (1<<1)
+#define IEEE80211_WMM_IE_STA_AC_BK (1<<2)
+#define IEEE80211_WMM_IE_STA_AC_BE (1<<3)
+
+/* U-APSD max SP length for WMM IEs sent by STA */
+#define IEEE80211_WMM_IE_STA_SP_ALL (0<<5)
+#define IEEE80211_WMM_IE_STA_SP_2 (2<<5)
+#define IEEE80211_WMM_IE_STA_SP_4 (1<<5)
+#define IEEE80211_WMM_IE_STA_SP_6 (3<<5)
+
struct ieee80211_hdr {
__le16 frame_control;
__le16 duration_id;
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 1d75b96..2e484bc 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -113,6 +113,7 @@ struct ieee80211_tx_queue_params {
u16 cw_min;
u16 cw_max;
u8 aifs;
+ bool uapsd;
};
/**
@@ -928,6 +929,10 @@ enum ieee80211_tkip_key_type {
* @IEEE80211_HW_BEACON_FILTER:
* Hardware supports dropping of irrelevant beacon frames to
* avoid waking up cpu.
+ *
+ * @IEEE80211_HW_UAPSD:
+ * Hardware supports Unscheduled Automatic Power Save Delivery
+ * (U-APSD).
*/
enum ieee80211_hw_flags {
IEEE80211_HW_HAS_RATE_CONTROL = 1<<0,
@@ -945,6 +950,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_SUPPORTS_DYNAMIC_PS = 1<<12,
IEEE80211_HW_MFP_CAPABLE = 1<<13,
IEEE80211_HW_BEACON_FILTER = 1<<14,
+ IEEE80211_HW_UAPSD = 1<<15,
};
/**
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 93ee1fd..fd17958 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1134,6 +1134,13 @@ static int ieee80211_set_txq_params(struct wiphy *wiphy,
p.cw_max = params->cwmax;
p.cw_min = params->cwmin;
p.txop = params->txop;
+
+ /*
+ * Setting tx queue params disables u-apsd because it's only
+ * called in master mode.
+ */
+ p.uapsd = false;
+
if (drv_conf_tx(local, params->queue, &p)) {
printk(KERN_DEBUG "%s: failed to set TX queue "
"parameters for queue %d\n",
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 785df97..94eaf21 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -81,6 +81,7 @@ struct ieee80211_bss {
u8 dtim_period;
bool wmm_used;
+ bool uapsd_supported;
unsigned long last_probe_resp;
@@ -264,6 +265,7 @@ enum ieee80211_sta_flags {
IEEE80211_STA_DISABLE_11N = BIT(4),
IEEE80211_STA_CSA_RECEIVED = BIT(5),
IEEE80211_STA_MFP_ENABLED = BIT(6),
+ IEEE80211_STA_UAPSD_ENABLED = BIT(7),
};
/* flags for MLME request */
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 6dc7b5a..c1c3f82 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -82,6 +82,8 @@ enum rx_mgmt_action {
RX_MGMT_CFG80211_ASSOC_TO,
};
+#define IEEE80211_DEFAULT_UAPSD_QUEUES IEEE80211_WMM_IE_STA_AC_VO
+
/* utils */
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
@@ -235,13 +237,14 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
- u8 *pos;
+ u8 *pos, qos_info;
const u8 *ies, *ht_ie;
int i, len, count, rates_len, supp_rates_len;
u16 capab;
int wmm = 0;
struct ieee80211_supported_band *sband;
u32 rates = 0;
+ bool uapsd;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
sizeof(*mgmt) + 200 + wk->ie_len +
@@ -268,6 +271,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
capab |= WLAN_CAPABILITY_PRIVACY;
if (wk->bss->wmm_used)
wmm = 1;
+ uapsd = wk->bss->uapsd_supported;
/* get all rates supported by the device and the AP as
* some APs don't like getting a superset of their rates
@@ -368,6 +372,15 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
}
if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
+ if (uapsd && (local->hw.flags & IEEE80211_HW_UAPSD)) {
+ qos_info = IEEE80211_DEFAULT_UAPSD_QUEUES;
+ qos_info |= IEEE80211_WMM_IE_STA_SP_ALL;
+ ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
+ } else {
+ qos_info = 0;
+ ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
+ }
+
pos = skb_put(skb, 9);
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
@@ -377,7 +390,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
*pos++ = 2; /* WME */
*pos++ = 0; /* WME info */
*pos++ = 1; /* WME ver */
- *pos++ = 0;
+ *pos++ = qos_info;
}
/* wmm support is a must to HT */
@@ -786,7 +799,7 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
struct ieee80211_tx_queue_params params;
size_t left;
int count;
- u8 *pos;
+ u8 *pos, uapsd_queues = 0;
if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
return;
@@ -796,6 +809,10 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
return;
+
+ if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
+ uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
+
count = wmm_param[6] & 0x0f;
if (count == ifmgd->wmm_last_param_set)
return;
@@ -810,6 +827,7 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
for (; left >= 4; left -= 4, pos += 4) {
int aci = (pos[0] >> 5) & 0x03;
int acm = (pos[0] >> 4) & 0x01;
+ bool uapsd = false;
int queue;
switch (aci) {
@@ -817,22 +835,30 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
queue = 3;
if (acm)
local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
+ if (uapsd_queues & IEEE80211_WMM_IE_STA_AC_BK)
+ uapsd = true;
break;
case 2: /* AC_VI */
queue = 1;
if (acm)
local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
+ if (uapsd_queues & IEEE80211_WMM_IE_STA_AC_VI)
+ uapsd = true;
break;
case 3: /* AC_VO */
queue = 0;
if (acm)
local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
+ if (uapsd_queues & IEEE80211_WMM_IE_STA_AC_VO)
+ uapsd = true;
break;
case 0: /* AC_BE */
default:
queue = 2;
if (acm)
local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
+ if (uapsd_queues & IEEE80211_WMM_IE_STA_AC_BE)
+ uapsd = true;
break;
}
@@ -840,11 +866,14 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
params.cw_min = ecw2cw(pos[1] & 0x0f);
params.txop = get_unaligned_le16(pos + 2);
+ params.uapsd = uapsd;
+
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
- "cWmin=%d cWmax=%d txop=%d\n",
+ "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
wiphy_name(local->hw.wiphy), queue, aci, acm,
- params.aifs, params.cw_min, params.cw_max, params.txop);
+ params.aifs, params.cw_min, params.cw_max, params.txop,
+ params.uapsd);
#endif
if (drv_conf_tx(local, queue, ¶ms) && local->ops->conf_tx)
printk(KERN_DEBUG "%s: failed to set TX queue "
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 4cf387c..b11ae49 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -50,6 +50,23 @@ void ieee80211_rx_bss_put(struct ieee80211_local *local,
cfg80211_put_bss((struct cfg80211_bss *)bss);
}
+static bool is_uapsd_supported(struct ieee802_11_elems *elems)
+{
+ u8 qos_info;
+
+ if (elems->wmm_info && elems->wmm_info_len == 7
+ && elems->wmm_info[5] == 1)
+ qos_info = elems->wmm_info[6];
+ else if (elems->wmm_param && elems->wmm_param_len == 24
+ && elems->wmm_param[5] == 1)
+ qos_info = elems->wmm_param[6];
+ else
+ /* no valid wmm information or parameter element found */
+ return false;
+
+ return qos_info & 0x80;
+}
+
struct ieee80211_bss *
ieee80211_bss_info_update(struct ieee80211_local *local,
struct ieee80211_rx_status *rx_status,
@@ -111,6 +128,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
}
bss->wmm_used = elems->wmm_param || elems->wmm_info;
+ bss->uapsd_supported = is_uapsd_supported(elems);
if (!beacon)
bss->last_probe_resp = jiffies;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index d09f78b..7129b39 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -781,6 +781,8 @@ void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
break;
}
+ qparam.uapsd = false;
+
drv_conf_tx(local, queue, &qparam);
}
}
--
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