[PATCH 00/10] cfg80211/mac80211 patches from our internal tree 2019-05-29

[PATCH 00/10] cfg80211/mac80211 patches from our internal tree 2019-05-29

[Luca Coelho]

From: Luca Coelho <luciano.coelho@intel.com>

Hi,

Some patches with mac80211 and cfg80211 changes from our internal
tree.

Please review, though you have already reviewed most if not all of
them ;)

Cheers,
Luca.


Avraham Stern (1):
  cfg80211: report measurement start TSF correctly

Ilan Peer (2):
  cfg80211: Add a function to iterate all BSS entries
  ieee80211: Add a missing extended capability flag definition

Johannes Berg (4):
  mac80211: call rate_control_send_low() internally
  mac80211: use STA info in rate_control_send_low()
  mac80211: fill low rate even for HAS_RATE_CONTROL
  mac80211: extend __rate_control_send_low warning

Luca Coelho (1):
  cfg80211: use BIT_ULL in cfg80211_parse_mbssid_data()

Mordechay Goodstein (1):
  cfg80211: util: fix bit count off by one

Naftali Goldstein (1):
  mac80211: do not start any work during reconfigure flow

 drivers/net/wireless/intel/iwlegacy/3945-rs.c |  3 --
 drivers/net/wireless/intel/iwlegacy/4965-rs.c |  4 --
 drivers/net/wireless/intel/iwlwifi/dvm/rs.c   | 26 ++++-------
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c   |  4 --
 drivers/net/wireless/realtek/rtlwifi/rc.c     |  3 --
 include/linux/ieee80211.h                     |  7 +++
 include/net/cfg80211.h                        | 20 +++++++++
 include/net/mac80211.h                        | 23 ----------
 net/mac80211/cfg.c                            |  4 +-
 net/mac80211/ieee80211_i.h                    |  7 +++
 net/mac80211/mlme.c                           |  7 ++-
 net/mac80211/rate.c                           | 28 ++++++------
 net/mac80211/rc80211_minstrel.c               |  5 +--
 net/mac80211/rc80211_minstrel_ht.c            |  4 +-
 net/mac80211/sta_info.c                       | 43 ++++++++++++++++++-
 net/mac80211/util.c                           |  4 ++
 net/wireless/pmsr.c                           |  4 +-
 net/wireless/scan.c                           | 25 ++++++++++-
 net/wireless/util.c                           |  2 +-
 19 files changed, 141 insertions(+), 82 deletions(-)

-- 
2.20.1

[PATCH 01/10] cfg80211: report measurement start TSF correctly

[Luca Coelho]

From: Avraham Stern <avraham.stern@intel.com>

Instead of reporting the AP's TSF, host time was reported. Fix it.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/wireless/pmsr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/wireless/pmsr.c b/net/wireless/pmsr.c
index 1b190475359a..c09fbf09549d 100644
--- a/net/wireless/pmsr.c
+++ b/net/wireless/pmsr.c
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * Copyright (C) 2018 Intel Corporation
+ * Copyright (C) 2018 - 2019 Intel Corporation
  */
 #ifndef __PMSR_H
 #define __PMSR_H
@@ -448,7 +448,7 @@ static int nl80211_pmsr_send_result(struct sk_buff *msg,
 
 	if (res->ap_tsf_valid &&
 	    nla_put_u64_64bit(msg, NL80211_PMSR_RESP_ATTR_AP_TSF,
-			      res->host_time, NL80211_PMSR_RESP_ATTR_PAD))
+			      res->ap_tsf, NL80211_PMSR_RESP_ATTR_PAD))
 		goto error;
 
 	if (res->final && nla_put_flag(msg, NL80211_PMSR_RESP_ATTR_FINAL))
-- 
2.20.1

[PATCH 02/10] cfg80211: use BIT_ULL in cfg80211_parse_mbssid_data()

[Luca Coelho]

From: Luca Coelho <luciano.coelho@intel.com>

The seen_indices variable is u64 and in other parts of the code we
assume mbssid_index_ie[2] can be up to 45, so we should use the 64-bit
versions of BIT, namely, BIT_ULL().

Reported-by: Dan Carpented <dan.carpenter@oracle.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/wireless/scan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index f347387f195a..2ea268ef1c43 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1602,12 +1602,12 @@ static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
 				continue;
 			}
 
-			if (seen_indices & BIT(mbssid_index_ie[2]))
+			if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
 				/* We don't support legacy split of a profile */
 				net_dbg_ratelimited("Partial info for BSSID index %d\n",
 						    mbssid_index_ie[2]);
 
-			seen_indices |= BIT(mbssid_index_ie[2]);
+			seen_indices |= BIT_ULL(mbssid_index_ie[2]);
 
 			non_tx_data->bssid_index = mbssid_index_ie[2];
 			non_tx_data->max_bssid_indicator = elem->data[0];
-- 
2.20.1

Re: [PATCH 02/10] cfg80211: use BIT_ULL in cfg80211_parse_mbssid_data()

[Kalle Valo]

Luca Coelho <luca@coelho.fi> writes:

> From: Luca Coelho <luciano.coelho@intel.com>
>
> The seen_indices variable is u64 and in other parts of the code we
> assume mbssid_index_ie[2] can be up to 45, so we should use the 64-bit
> versions of BIT, namely, BIT_ULL().
>
> Reported-by: Dan Carpented <dan.carpenter@oracle.com>

s/ted/ter/ :)

-- 
Kalle Valo

[PATCH 03/10] mac80211: do not start any work during reconfigure flow

[Luca Coelho]

From: Naftali Goldstein <naftali.goldstein@intel.com>

It is not a good idea to try to perform any work (e.g. send an auth
frame) during reconfigure flow.

Prevent this from happening, and at the end of the reconfigure flow
requeue all the works.

Signed-off-by: Naftali Goldstein <naftali.goldstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/mac80211/ieee80211_i.h | 7 +++++++
 net/mac80211/util.c        | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 073a8235ae1b..b10fe579f993 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -2037,6 +2037,13 @@ void __ieee80211_flush_queues(struct ieee80211_local *local,
 
 static inline bool ieee80211_can_run_worker(struct ieee80211_local *local)
 {
+	/*
+	 * It's unsafe to try to do any work during reconfigure flow.
+	 * When the flow ends the work will be requeued.
+	 */
+	if (local->in_reconfig)
+		return false;
+
 	/*
 	 * If quiescing is set, we are racing with __ieee80211_suspend.
 	 * __ieee80211_suspend flushes the workers after setting quiescing,
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index cba4633cd6cf..81615d86fd70 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2480,6 +2480,10 @@ int ieee80211_reconfig(struct ieee80211_local *local)
 		mutex_lock(&local->mtx);
 		ieee80211_start_next_roc(local);
 		mutex_unlock(&local->mtx);
+
+		/* Requeue all works */
+		list_for_each_entry(sdata, &local->interfaces, list)
+			ieee80211_queue_work(&local->hw, &sdata->work);
 	}
 
 	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
-- 
2.20.1

[PATCH 04/10] cfg80211: util: fix bit count off by one

[Luca Coelho]

From: Mordechay Goodstein <mordechay.goodstein@intel.com>

The bits of Rx MCS Map in VHT capability were enumerated
with index transform - index i -> (i + 1) bit => nss i. BUG!
while it should be -   index i -> (i + 1) bit => (i + 1) nss.

The bug was exposed in commit a53b2a0b1245 ("iwlwifi: mvm: implement VHT
extended NSS support in rs.c"), where iwlwifi started using the
function.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Fixes: b0aa75f0b1b2 ("ieee80211: add new VHT capability fields/parsing")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/wireless/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index cf63b635afc0..33dbf7ee9b97 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1998,7 +1998,7 @@ int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
 			continue;
 
 		if (supp >= mcs_encoding) {
-			max_vht_nss = i;
+			max_vht_nss = i + 1;
 			break;
 		}
 	}
-- 
2.20.1

[PATCH 05/10] cfg80211: Add a function to iterate all BSS entries

[Luca Coelho]

From: Ilan Peer <ilan.peer@intel.com>

Add a function that iterates over the BSS entries associated with a
given wiphy and calls a callback for each iterated BSS. This can be
used by drivers in various ways, e.g., to evaluate some property for
all the BSSs in the medium.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 include/net/cfg80211.h | 20 ++++++++++++++++++++
 net/wireless/scan.c    | 21 +++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index c19687833493..d5c1cfef443a 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5721,6 +5721,26 @@ void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
  */
 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
 
+/**
+ * cfg80211_bss_iter - iterate all BSS entries
+ *
+ * This function iterates over the BSS entries associated with the given wiphy
+ * and calls the callback for the iterated BSS. The iterator function is not
+ * allowed to call functions that might modify the internal state of the BSS DB.
+ *
+ * @wiphy: the wiphy
+ * @chandef: if given, the iterator function will be called only if the channel
+ *     of the currently iterated BSS is a subset of the given channel.
+ * @iter: the iterator function to call
+ * @iter_data: an argument to the iterator function
+ */
+void cfg80211_bss_iter(struct wiphy *wiphy,
+		       struct cfg80211_chan_def *chandef,
+		       void (*iter)(struct wiphy *wiphy,
+				    struct cfg80211_bss *bss,
+				    void *data),
+		       void *iter_data);
+
 static inline enum nl80211_bss_scan_width
 cfg80211_chandef_to_scan_width(const struct cfg80211_chan_def *chandef)
 {
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 2ea268ef1c43..d66e6d4b7555 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1974,6 +1974,27 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 }
 EXPORT_SYMBOL(cfg80211_unlink_bss);
 
+void cfg80211_bss_iter(struct wiphy *wiphy,
+		       struct cfg80211_chan_def *chandef,
+		       void (*iter)(struct wiphy *wiphy,
+				    struct cfg80211_bss *bss,
+				    void *data),
+		       void *iter_data)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *bss;
+
+	spin_lock_bh(&rdev->bss_lock);
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
+			iter(wiphy, &bss->pub, iter_data);
+	}
+
+	spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_bss_iter);
+
 #ifdef CONFIG_CFG80211_WEXT
 static struct cfg80211_registered_device *
 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
-- 
2.20.1

[PATCH 06/10] ieee80211: Add a missing extended capability flag definition

[Luca Coelho]

From: Ilan Peer <ilan.peer@intel.com>

Add the "OBSS Narrow Bandwidth RU In OFDMA Tolerance Support" flag
definition to the definitions of the flags covered by the Extended
Capability IE.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 include/linux/ieee80211.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 61f0a316c6ac..902812bec11d 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -2712,6 +2712,13 @@ enum ieee80211_tdls_actioncode {
 #define WLAN_EXT_CAPA10_TWT_REQUESTER_SUPPORT	BIT(5)
 #define WLAN_EXT_CAPA10_TWT_RESPONDER_SUPPORT	BIT(6)
 
+/*
+ * When set, indicates that the AP is able to tolerate 26-tone RU UL
+ * OFDMA transmissions using HE TB PPDU from OBSS (not falsely classify the
+ * 26-tone RU UL OFDMA transmissions as radar pulses).
+ */
+#define WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT BIT(7)
+
 /* Defines support for enhanced multi-bssid advertisement*/
 #define WLAN_EXT_CAPA11_EMA_SUPPORT	BIT(1)
 
-- 
2.20.1

[PATCH 07/10] mac80211: call rate_control_send_low() internally

[Luca Coelho]

From: Johannes Berg <johannes.berg@intel.com>

There's no rate control algorithm that *doesn't* want to call
it internally, and calling it internally will let us modify
its behaviour in the future.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[removed the call from non-iwlwifi drivers]
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlegacy/3945-rs.c |  3 ---
 drivers/net/wireless/intel/iwlegacy/4965-rs.c |  4 ---
 drivers/net/wireless/intel/iwlwifi/dvm/rs.c   | 26 +++++++------------
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c   |  4 ---
 drivers/net/wireless/realtek/rtlwifi/rc.c     |  3 ---
 include/net/mac80211.h                        | 23 ----------------
 net/mac80211/rate.c                           | 14 +++++-----
 net/mac80211/rc80211_minstrel.c               |  5 +---
 net/mac80211/rc80211_minstrel_ht.c            |  4 +--
 9 files changed, 19 insertions(+), 67 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlegacy/3945-rs.c b/drivers/net/wireless/intel/iwlegacy/3945-rs.c
index a697edd46e7f..922f09f7ea3e 100644
--- a/drivers/net/wireless/intel/iwlegacy/3945-rs.c
+++ b/drivers/net/wireless/intel/iwlegacy/3945-rs.c
@@ -646,9 +646,6 @@ il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
 		il_sta = NULL;
 	}
 
-	if (rate_control_send_low(sta, il_sta, txrc))
-		return;
-
 	rate_mask = sta->supp_rates[sband->band];
 
 	/* get user max rate if set */
diff --git a/drivers/net/wireless/intel/iwlegacy/4965-rs.c b/drivers/net/wireless/intel/iwlegacy/4965-rs.c
index 54ff83829afb..946f352fd9a4 100644
--- a/drivers/net/wireless/intel/iwlegacy/4965-rs.c
+++ b/drivers/net/wireless/intel/iwlegacy/4965-rs.c
@@ -2224,10 +2224,6 @@ il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
 		il_sta = NULL;
 	}
 
-	/* Send management frames and NO_ACK data using lowest rate. */
-	if (rate_control_send_low(sta, il_sta, txrc))
-		return;
-
 	if (!lq_sta)
 		return;
 
diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
index ef4b9de256f7..5e6af876bcb7 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
@@ -1,6 +1,7 @@
 /******************************************************************************
  *
  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
+ * Copyright (C) 2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License as
@@ -2715,25 +2716,17 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
 	IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
 
 	/* Get max rate if user set max rate */
-	if (lq_sta) {
-		lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
-		if ((sband->band == NL80211_BAND_5GHZ) &&
-		    (lq_sta->max_rate_idx != -1))
-			lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
-		if ((lq_sta->max_rate_idx < 0) ||
-		    (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
-			lq_sta->max_rate_idx = -1;
-	}
+	lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
+	if (sband->band == NL80211_BAND_5GHZ && lq_sta->max_rate_idx != -1)
+		lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
+	if (lq_sta->max_rate_idx < 0 || lq_sta->max_rate_idx >= IWL_RATE_COUNT)
+		lq_sta->max_rate_idx = -1;
 
-	/* Treat uninitialized rate scaling data same as non-existing. */
-	if (lq_sta && !lq_sta->drv) {
+	if (!lq_sta->drv) {
 		IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
-		priv_sta = NULL;
-	}
-
-	/* Send management frames and NO_ACK data using lowest rate. */
-	if (rate_control_send_low(sta, priv_sta, txrc))
+		/* mac80211 already set up the data for using low rates */
 		return;
+	}
 
 	rate_idx  = lq_sta->last_txrate_idx;
 
@@ -2802,7 +2795,6 @@ void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_i
 	lq_sta = &sta_priv->lq_sta;
 	sband = hw->wiphy->bands[conf->chandef.chan->band];
 
-
 	lq_sta->lq.sta_id = sta_id;
 
 	for (j = 0; j < LQ_SIZE; j++)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index c182821ab22b..9107b1698b0f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -2960,10 +2960,6 @@ static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
 		mvm_sta = NULL;
 	}
 
-	/* Send management frames and NO_ACK data using lowest rate. */
-	if (rate_control_send_low(sta, mvm_sta, txrc))
-		return;
-
 	if (!mvm_sta)
 		return;
 
diff --git a/drivers/net/wireless/realtek/rtlwifi/rc.c b/drivers/net/wireless/realtek/rtlwifi/rc.c
index cf8e42a01015..0c7d74902d33 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rc.c
@@ -173,9 +173,6 @@ static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
 	u8 try_per_rate, i, rix;
 	bool not_data = !ieee80211_is_data(fc);
 
-	if (rate_control_send_low(sta, priv_sta, txrc))
-		return;
-
 	rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 	try_per_rate = 1;
 	_rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 72080d9d617e..9dc98d6d1b4d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -5951,29 +5951,6 @@ static inline int rate_supported(struct ieee80211_sta *sta,
 	return (sta == NULL || sta->supp_rates[band] & BIT(index));
 }
 
-/**
- * rate_control_send_low - helper for drivers for management/no-ack frames
- *
- * Rate control algorithms that agree to use the lowest rate to
- * send management frames and NO_ACK data with the respective hw
- * retries should use this in the beginning of their mac80211 get_rate
- * callback. If true is returned the rate control can simply return.
- * If false is returned we guarantee that sta and sta and priv_sta is
- * not null.
- *
- * Rate control algorithms wishing to do more intelligent selection of
- * rate for multicast/broadcast frames may choose to not use this.
- *
- * @sta: &struct ieee80211_sta pointer to the target destination. Note
- * 	that this may be null.
- * @priv_sta: private rate control structure. This may be null.
- * @txrc: rate control information we sholud populate for mac80211.
- */
-bool rate_control_send_low(struct ieee80211_sta *sta,
-			   void *priv_sta,
-			   struct ieee80211_tx_rate_control *txrc);
-
-
 static inline s8
 rate_lowest_index(struct ieee80211_supported_band *sband,
 		  struct ieee80211_sta *sta)
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 76f303fda3ed..c78a259d81ed 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -3,6 +3,7 @@
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  * Copyright 2017	Intel Deutschland GmbH
+ * Copyright (C) 2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -369,9 +370,8 @@ static void __rate_control_send_low(struct ieee80211_hw *hw,
 }
 
 
-bool rate_control_send_low(struct ieee80211_sta *pubsta,
-			   void *priv_sta,
-			   struct ieee80211_tx_rate_control *txrc)
+static bool rate_control_send_low(struct ieee80211_sta *pubsta,
+				  struct ieee80211_tx_rate_control *txrc)
 {
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
 	struct ieee80211_supported_band *sband = txrc->sband;
@@ -379,7 +379,7 @@ bool rate_control_send_low(struct ieee80211_sta *pubsta,
 	int mcast_rate;
 	bool use_basicrate = false;
 
-	if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
+	if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) {
 		__rate_control_send_low(txrc->hw, sband, pubsta, info,
 					txrc->rate_idx_mask);
 
@@ -405,7 +405,6 @@ bool rate_control_send_low(struct ieee80211_sta *pubsta,
 	}
 	return false;
 }
-EXPORT_SYMBOL(rate_control_send_low);
 
 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
 {
@@ -902,12 +901,15 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
 	if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
 		return;
 
+	if (rate_control_send_low(ista, txrc))
+		return;
+
 	if (ista) {
 		spin_lock_bh(&sta->rate_ctrl_lock);
 		ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
 		spin_unlock_bh(&sta->rate_ctrl_lock);
 	} else {
-		ref->ops->get_rate(ref->priv, NULL, NULL, txrc);
+		rate_control_send_low(NULL, txrc);
 	}
 
 	if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c
index a34e9c2ca626..9bb2e89daa9c 100644
--- a/net/mac80211/rc80211_minstrel.c
+++ b/net/mac80211/rc80211_minstrel.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -340,10 +341,6 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
 	int delta;
 	int sampling_ratio;
 
-	/* management/no-ack frames do not use rate control */
-	if (rate_control_send_low(sta, priv_sta, txrc))
-		return;
-
 	/* check multi-rate-retry capabilities & adjust lookaround_rate */
 	mrr_capable = mp->has_mrr &&
 		      !txrc->rts &&
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 8b168724c5e7..63c648d2bdcf 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -1098,9 +1099,6 @@ minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
 	struct minstrel_priv *mp = priv;
 	int sample_idx;
 
-	if (rate_control_send_low(sta, priv_sta, txrc))
-		return;
-
 	if (!msp->is_ht)
 		return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc);
 
-- 
2.20.1

[PATCH 08/10] mac80211: use STA info in rate_control_send_low()

[Luca Coelho]

From: Johannes Berg <johannes.berg@intel.com>

Even if we have a station, we currently call rate_control_send_low()
with the NULL station unless further rate control (driver, minstrel)
has been initialized.

Change this so we can use more information about the station to use
a better rate. For example, when we associate with an AP, we will
now use the lowest rate it advertised as supported (that we can)
rather than the lowest mandatory rate. This aligns our behaviour
with most other 802.11 implementations.

To make this possible, we need to also ensure that we have non-zero
rates at all times, so in case we really have *nothing* pre-fill
the supp_rates bitmap with the very lowest mandatory bitmap (11b
and 11a on 2.4 and 5 GHz respectively).

Additionally, hostapd appears to be giving us an empty supported
rates bitmap (it can and should do better, since the STA must have
supported for at least the basic rates in the BSS), so ignore any
such bitmaps that would actually zero out the supp_rates, and in
that case just keep the pre-filled mandatory rates.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/mac80211/cfg.c      |  4 ++--
 net/mac80211/mlme.c     |  7 ++++++-
 net/mac80211/rate.c     | 12 ++++++------
 net/mac80211/sta_info.c | 43 ++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 56 insertions(+), 10 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 52e6a091b7e4..16d006b92eab 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -4,7 +4,7 @@
  * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2015  Intel Mobile Communications GmbH
  * Copyright (C) 2015-2017 Intel Deutschland GmbH
- * Copyright (C) 2018 Intel Corporation
+ * Copyright (C) 2018-2019 Intel Corporation
  *
  * This file is GPLv2 as found in COPYING.
  */
@@ -1466,7 +1466,7 @@ static int sta_apply_parameters(struct ieee80211_local *local,
 			return ret;
 	}
 
-	if (params->supported_rates) {
+	if (params->supported_rates && params->supported_rates_len) {
 		ieee80211_parse_bitrates(&sdata->vif.bss_conf.chandef,
 					 sband, params->supported_rates,
 					 params->supported_rates_len,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index b7a9fe3d5fcb..bc2fdadf69bc 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4941,7 +4941,12 @@ static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
 			basic_rates = BIT(min_rate_index);
 		}
 
-		new_sta->sta.supp_rates[cbss->channel->band] = rates;
+		if (rates)
+			new_sta->sta.supp_rates[cbss->channel->band] = rates;
+		else
+			sdata_info(sdata,
+				   "No rates found, keeping mandatory only\n");
+
 		sdata->vif.bss_conf.basic_rates = basic_rates;
 
 		/* cf. IEEE 802.11 9.2.12 */
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index c78a259d81ed..8747231f7aa3 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -887,11 +887,6 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
 	int i;
 
-	if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
-		ista = &sta->sta;
-		priv_sta = sta->rate_ctrl_priv;
-	}
-
 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 		info->control.rates[i].idx = -1;
 		info->control.rates[i].flags = 0;
@@ -901,9 +896,14 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
 	if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
 		return;
 
-	if (rate_control_send_low(ista, txrc))
+	if (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
 		return;
 
+	if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
+		ista = &sta->sta;
+		priv_sta = sta->rate_ctrl_priv;
+	}
+
 	if (ista) {
 		spin_lock_bh(&sta->rate_ctrl_lock);
 		ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index a4932ee3595c..315adb473e2c 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -3,7 +3,7 @@
  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
- * Copyright (C) 2018 Intel Corporation
+ * Copyright (C) 2018-2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -404,6 +404,47 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 		sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
 
+	for (i = 0; i < NUM_NL80211_BANDS; i++) {
+		u32 mandatory = 0;
+		int r;
+
+		if (!hw->wiphy->bands[i])
+			continue;
+
+		switch (i) {
+		case NL80211_BAND_2GHZ:
+			/*
+			 * We use both here, even if we cannot really know for
+			 * sure the station will support both, but the only use
+			 * for this is when we don't know anything yet and send
+			 * management frames, and then we'll pick the lowest
+			 * possible rate anyway.
+			 * If we don't include _G here, we cannot find a rate
+			 * in P2P, and thus trigger the WARN_ONCE() in rate.c
+			 */
+			mandatory = IEEE80211_RATE_MANDATORY_B |
+				    IEEE80211_RATE_MANDATORY_G;
+			break;
+		case NL80211_BAND_5GHZ:
+			mandatory = IEEE80211_RATE_MANDATORY_A;
+			break;
+		case NL80211_BAND_60GHZ:
+			WARN_ON(1);
+			mandatory = 0;
+			break;
+		}
+
+		for (r = 0; r < hw->wiphy->bands[i]->n_bitrates; r++) {
+			struct ieee80211_rate *rate;
+
+			rate = &hw->wiphy->bands[i]->bitrates[r];
+
+			if (!(rate->flags & mandatory))
+				continue;
+			sta->sta.supp_rates[i] |= BIT(r);
+		}
+	}
+
 	sta->sta.smps_mode = IEEE80211_SMPS_OFF;
 	if (sdata->vif.type == NL80211_IFTYPE_AP ||
 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
-- 
2.20.1

[PATCH 09/10] mac80211: fill low rate even for HAS_RATE_CONTROL

[Luca Coelho]

From: Johannes Berg <johannes.berg@intel.com>

If HW advertises it has rate control, we skip all of the
rate control assignments, but sometimes the data we have
here is useful, especially so that we don't have to do
the lookups again on which rates are configured and are
supported.

So do the low rate assignment anyway to help out drivers
that might need it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/mac80211/rate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 8747231f7aa3..5d94576dd683 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -893,10 +893,10 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
 		info->control.rates[i].count = 0;
 	}
 
-	if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
+	if (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
 		return;
 
-	if (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
+	if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
 		return;
 
 	if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
-- 
2.20.1

[PATCH 10/10] mac80211: extend __rate_control_send_low warning

[Luca Coelho]

From: Johannes Berg <johannes.berg@intel.com>

This appears to happen occasionally, and if it does we
really want even more information than we have now.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 net/mac80211/rate.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 5d94576dd683..d298bb222491 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -358,8 +358,10 @@ static void __rate_control_send_low(struct ieee80211_hw *hw,
 		break;
 	}
 	WARN_ONCE(i == sband->n_bitrates,
-		  "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
+		  "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n",
+		  sta ? sta->addr : NULL,
 		  sta ? sta->supp_rates[sband->band] : -1,
+		  sband->band,
 		  rate_mask, rate_flags);
 
 	info->control.rates[0].count =
-- 
2.20.1