diff mbox series

wcn36xx: Disable bmps when encryption is disabled

Message ID 1598363127-26066-1-git-send-email-loic.poulain@linaro.org (mailing list archive)
State Accepted
Commit c6522a5076e1a65877c51cfee313a74ef61cabf8
Delegated to: Kalle Valo
Headers show
Series wcn36xx: Disable bmps when encryption is disabled | expand

Commit Message

Loic Poulain Aug. 25, 2020, 1:45 p.m. UTC
For whatever reason, when connected to an open/no-security BSS,
the wcn36xx controller in bmps mode does not forward 'wake-up'
beacons despite AP sends DTIM with station AID.

Meaning that AP is not able to wakeup the station and needs to wait
for the station to wakeup by its own (TX data, keep alive pkt...),
causing serious latency issues and unexpected deauth.

When connected to AP with encryption enabled, this issue does not occur.
So a simple workaround is to only enable bmps support in that case.

Ideally, it should be propertly fixed to allow bmps support with open
BSS, whatever the issue is at driver or firmware level.

Tested on wcn3620 and wcn3680.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 drivers/net/wireless/ath/wcn36xx/main.c    | 10 ++++++++++
 drivers/net/wireless/ath/wcn36xx/pmc.c     |  5 ++++-
 drivers/net/wireless/ath/wcn36xx/wcn36xx.h |  1 +
 3 files changed, 15 insertions(+), 1 deletion(-)

Comments

Kalle Valo Aug. 27, 2020, 10:15 a.m. UTC | #1
Loic Poulain <loic.poulain@linaro.org> wrote:

> For whatever reason, when connected to an open/no-security BSS,
> the wcn36xx controller in bmps mode does not forward 'wake-up'
> beacons despite AP sends DTIM with station AID.
> 
> Meaning that AP is not able to wakeup the station and needs to wait
> for the station to wakeup by its own (TX data, keep alive pkt...),
> causing serious latency issues and unexpected deauth.
> 
> When connected to AP with encryption enabled, this issue does not occur.
> So a simple workaround is to only enable bmps support in that case.
> 
> Ideally, it should be propertly fixed to allow bmps support with open
> BSS, whatever the issue is at driver or firmware level.
> 
> Tested on wcn3620 and wcn3680.
> 
> Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
> Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

c6522a5076e1 wcn36xx: Disable bmps when encryption is disabled
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index 2f36656..39d658c 100644
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -610,6 +610,15 @@  static int wcn36xx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 				}
 			}
 		}
+		/* FIXME: Only enable bmps support when encryption is enabled.
+		 * For any reasons, when connected to open/no-security BSS,
+		 * the wcn36xx controller in bmps mode does not forward
+		 * 'wake-up' beacons despite AP sends DTIM with station AID.
+		 * It could be due to a firmware issue or to the way driver
+		 * configure the station.
+		 */
+		if (vif->type == NL80211_IFTYPE_STATION)
+			vif_priv->allow_bmps = true;
 		break;
 	case DISABLE_KEY:
 		if (!(IEEE80211_KEY_FLAG_PAIRWISE & key_conf->flags)) {
@@ -891,6 +900,7 @@  static void wcn36xx_bss_info_changed(struct ieee80211_hw *hw,
 				    vif->addr,
 				    bss_conf->aid);
 			vif_priv->sta_assoc = false;
+			vif_priv->allow_bmps = false;
 			wcn36xx_smd_set_link_st(wcn,
 						bss_conf->bssid,
 						vif->addr,
diff --git a/drivers/net/wireless/ath/wcn36xx/pmc.c b/drivers/net/wireless/ath/wcn36xx/pmc.c
index 2936aaf..2d0780f 100644
--- a/drivers/net/wireless/ath/wcn36xx/pmc.c
+++ b/drivers/net/wireless/ath/wcn36xx/pmc.c
@@ -23,7 +23,10 @@  int wcn36xx_pmc_enter_bmps_state(struct wcn36xx *wcn,
 {
 	int ret = 0;
 	struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
-	/* TODO: Make sure the TX chain clean */
+
+	if (!vif_priv->allow_bmps)
+		return -ENOTSUPP;
+
 	ret = wcn36xx_smd_enter_bmps(wcn, vif);
 	if (!ret) {
 		wcn36xx_dbg(WCN36XX_DBG_PMC, "Entered BMPS\n");
diff --git a/drivers/net/wireless/ath/wcn36xx/wcn36xx.h b/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
index 3221fed..719a6da 100644
--- a/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
+++ b/drivers/net/wireless/ath/wcn36xx/wcn36xx.h
@@ -122,6 +122,7 @@  struct wcn36xx_vif {
 	enum wcn36xx_hal_bss_type bss_type;
 
 	/* Power management */
+	bool allow_bmps;
 	enum wcn36xx_power_state pw_state;
 
 	u8 bss_index;