Merge tag 'master-2014-10-02' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next

John W. Linville says:

====================
pull request: wireless-next 2014-10-03

Please pull tihs batch of updates intended for the 3.18 stream!

For the iwlwifi bits, Emmanuel says:

"I have here a few things that depend on the latest mac80211's changes:
RRM, TPC, Quiet Period etc...  Eyal keeps improving our rate control
and we have a new device ID. This last patch should probably have
gone to wireless.git, but at that stage, I preferred to send it to
-next and CC stable."

For (most of) the Atheros bits, Kalle says:

"The only new feature is testmode support from me. Ben added a new method
to crash the firmware with an assert for debug purposes. As usual, we
have lots of smaller fixes from Michal. Matteo fixed a Kconfig
dependency with debugfs. I fixed some warnings recently added to
checkpatch."

For the NFC bits, Samuel says:

"We've had major updates for TI and ST Microelectronics drivers, and a
few NCI related changes.

For TI's trf7970a driver:

- Target mode support for trf7970a
- Suspend/resume support for trf7970a
- DT properties additions to handle different quirks
- A bunch of fixes for smartphone IOP related issues

For ST Microelectronics' ST21NFCA and ST21NFCB drivers:

- ISO15693 support for st21nfcb
- checkpatch and sparse related warning fixes
- Code cleanups and a few minor fixes

Finally, Marvell added ISO15693 support to the NCI stack, together with a
couple of NCI fixes."

For the Bluetooth bits, Johan says:

"This 3.18 pull request replaces the one I did on Monday ("bluetooth-next
2014-09-22", which hasn't been pulled yet). The additions since the last
request are:

 - SCO connection fix for devices not supporting eSCO
 - Cleanups regarding the SCO establishment logic
 - Remove unnecessary return value from logging functions
 - Header compression fix for 6lowpan
 - Cleanups to the ieee802154/mrf24j40 driver

Here's a copy from previous request that this one replaces:

'
Here are some more patches for 3.18. They include various fixes to the
btusb HCI driver, a fix for LE SMP, as well as adding Jukka to the
MAINTAINERS file for generic 6LoWPAN (as requested by Alexander Aring).

I've held on to this pull request a bit since we were waiting for a SCO
related fix to get sorted out first. However, since the merge window is
getting closer I decided not to wait for it. If we do get the fix sorted
out there'll probably be a second small pull request later this week.
'"

And,

"Unless 3.17 gets delayed this will probably be our last -next pull request for
3.18. We've got:

  - New Marvell hardware supportr
  - Multicast support for 6lowpan
  - Several of 6lowpan fixes & cleanups
  - Fix for a (false-positive) lockdep warning in L2CAP
  - Minor btusb cleanup"

On top of all that comes the usual sort of updates to ath5k, ath9k,
ath10k, brcmfmac, mwifiex, and wil6210.  This time around there are
also a number of rtlwifi updates to enable some new hardware and
to reconcile the in-kernel drivers with some newer releases of the
Realtek vendor drivers.  Also of note is some device tree work for
the bcma bus.

Please let me know if there are problems!
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 157 insertions, 83 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c
index f77dfe4df07..18a53999958 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.c
@@ -377,9 +377,9 @@ static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 }
 
 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
-				   struct sk_buff *skb,
-				   struct ieee80211_sta *sta,
-				   struct iwl_lq_sta *lq_sta);
+				  struct ieee80211_sta *sta,
+				  struct iwl_lq_sta *lq_sta,
+				  int tid);
 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 			   struct ieee80211_sta *sta,
 			   struct iwl_lq_sta *lq_sta,
@@ -1007,27 +1007,35 @@ static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
 	return RATE_MCS_CHAN_WIDTH_20;
 }
 
-/*
- * mac80211 sends us Tx status
- */
-static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
-			 struct ieee80211_sta *sta, void *priv_sta,
-			 struct sk_buff *skb)
+static u8 rs_get_tid(struct ieee80211_hdr *hdr)
+{
+	u8 tid = IWL_MAX_TID_COUNT;
+
+	if (ieee80211_is_data_qos(hdr->frame_control)) {
+		u8 *qc = ieee80211_get_qos_ctl(hdr);
+		tid = qc[0] & 0xf;
+	}
+
+	if (unlikely(tid > IWL_MAX_TID_COUNT))
+		tid = IWL_MAX_TID_COUNT;
+
+	return tid;
+}
+
+void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
+			  int tid, struct ieee80211_tx_info *info)
 {
 	int legacy_success;
 	int retries;
 	int mac_index, i;
-	struct iwl_lq_sta *lq_sta = priv_sta;
 	struct iwl_lq_cmd *table;
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
-	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
-	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	enum mac80211_rate_control_flags mac_flags;
 	u32 ucode_rate;
 	struct rs_rate rate;
 	struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 	u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
+	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
+	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
 
 	/* Treat uninitialized rate scaling data same as non-existing. */
 	if (!lq_sta) {
@@ -1045,10 +1053,6 @@ static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 		return;
 	}
 #endif
-	if (!ieee80211_is_data(hdr->frame_control) ||
-	    info->flags & IEEE80211_TX_CTL_NO_ACK)
-		return;
-
 	/* This packet was aggregated but doesn't carry status info */
 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
@@ -1094,7 +1098,7 @@ static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 		for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
 			ieee80211_stop_tx_ba_session(sta, tid);
 
-		iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
+		iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
 		return;
 	}
 	lq_sta->last_tx = jiffies;
@@ -1221,8 +1225,28 @@ static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
 done:
 	/* See if there's a better rate or modulation mode to try. */
-	if (sta && sta->supp_rates[sband->band])
-		rs_rate_scale_perform(mvm, skb, sta, lq_sta);
+	if (sta && sta->supp_rates[info->band])
+		rs_rate_scale_perform(mvm, sta, lq_sta, tid);
+}
+
+/*
+ * mac80211 sends us Tx status
+ */
+static void rs_mac80211_tx_status(void *mvm_r,
+				  struct ieee80211_supported_band *sband,
+				  struct ieee80211_sta *sta, void *priv_sta,
+				  struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
+	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+	if (!ieee80211_is_data(hdr->frame_control) ||
+	    info->flags & IEEE80211_TX_CTL_NO_ACK)
+		return;
+
+	iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
 }
 
 /*
@@ -1493,22 +1517,6 @@ static void rs_update_rate_tbl(struct iwl_mvm *mvm,
 	iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
 }
 
-static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
-		     struct ieee80211_hdr *hdr)
-{
-	u8 tid = IWL_MAX_TID_COUNT;
-
-	if (ieee80211_is_data_qos(hdr->frame_control)) {
-		u8 *qc = ieee80211_get_qos_ctl(hdr);
-		tid = qc[0] & 0xf;
-	}
-
-	if (unlikely(tid > IWL_MAX_TID_COUNT))
-		tid = IWL_MAX_TID_COUNT;
-
-	return tid;
-}
-
 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
 					 struct iwl_lq_sta *lq_sta,
 					 struct ieee80211_sta *sta,
@@ -1947,12 +1955,10 @@ static bool rs_tpc_perform(struct iwl_mvm *mvm,
  * Do rate scaling and search for new modulation mode.
  */
 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
-				  struct sk_buff *skb,
 				  struct ieee80211_sta *sta,
-				  struct iwl_lq_sta *lq_sta)
+				  struct iwl_lq_sta *lq_sta,
+				  int tid)
 {
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	int low = IWL_RATE_INVALID;
 	int high = IWL_RATE_INVALID;
 	int index;
@@ -1969,29 +1975,12 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 	u8 done_search = 0;
 	u16 high_low;
 	s32 sr;
-	u8 tid = IWL_MAX_TID_COUNT;
 	u8 prev_agg = lq_sta->is_agg;
 	struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
 	struct iwl_mvm_tid_data *tid_data;
 	struct rs_rate *rate;
 
-	/* Send management frames and NO_ACK data using lowest rate. */
-	/* TODO: this could probably be improved.. */
-	if (!ieee80211_is_data(hdr->frame_control) ||
-	    info->flags & IEEE80211_TX_CTL_NO_ACK)
-		return;
-
-	tid = rs_get_tid(lq_sta, hdr);
-	if ((tid != IWL_MAX_TID_COUNT) &&
-	    (lq_sta->tx_agg_tid_en & (1 << tid))) {
-		tid_data = &sta_priv->tid_data[tid];
-		if (tid_data->state == IWL_AGG_OFF)
-			lq_sta->is_agg = 0;
-		else
-			lq_sta->is_agg = 1;
-	} else {
-		lq_sta->is_agg = 0;
-	}
+	lq_sta->is_agg = !!sta_priv->agg_tids;
 
 	/*
 	 * Select rate-scale / modulation-mode table to work with in
@@ -2288,6 +2277,110 @@ out:
 	lq_sta->last_txrate_idx = index;
 }
 
+struct rs_init_rate_info {
+	s8 rssi;
+	u8 rate_idx;
+};
+
+static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
+	{ -60, IWL_RATE_54M_INDEX },
+	{ -64, IWL_RATE_48M_INDEX },
+	{ -68, IWL_RATE_36M_INDEX },
+	{ -80, IWL_RATE_24M_INDEX },
+	{ -84, IWL_RATE_18M_INDEX },
+	{ -85, IWL_RATE_12M_INDEX },
+	{ -86, IWL_RATE_11M_INDEX },
+	{ -88, IWL_RATE_5M_INDEX  },
+	{ -90, IWL_RATE_2M_INDEX  },
+	{ S8_MIN, IWL_RATE_1M_INDEX },
+};
+
+static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
+	{ -60, IWL_RATE_54M_INDEX },
+	{ -64, IWL_RATE_48M_INDEX },
+	{ -72, IWL_RATE_36M_INDEX },
+	{ -80, IWL_RATE_24M_INDEX },
+	{ -84, IWL_RATE_18M_INDEX },
+	{ -85, IWL_RATE_12M_INDEX },
+	{ -87, IWL_RATE_9M_INDEX  },
+	{ S8_MIN, IWL_RATE_6M_INDEX },
+};
+
+/* Choose an initial legacy rate and antenna to use based on the RSSI
+ * of last Rx
+ */
+static void rs_get_initial_rate(struct iwl_mvm *mvm,
+				struct iwl_lq_sta *lq_sta,
+				enum ieee80211_band band,
+				struct rs_rate *rate)
+{
+	int i, nentries;
+	s8 best_rssi = S8_MIN;
+	u8 best_ant = ANT_NONE;
+	u8 valid_tx_ant = mvm->fw->valid_tx_ant;
+	const struct rs_init_rate_info *initial_rates;
+
+	for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
+		if (!(lq_sta->pers.chains & BIT(i)))
+			continue;
+
+		if (lq_sta->pers.chain_signal[i] > best_rssi) {
+			best_rssi = lq_sta->pers.chain_signal[i];
+			best_ant = BIT(i);
+		}
+	}
+
+	IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
+		       rs_pretty_ant(best_ant), best_rssi);
+
+	if (best_ant != ANT_A && best_ant != ANT_B)
+		rate->ant = first_antenna(valid_tx_ant);
+	else
+		rate->ant = best_ant;
+
+	rate->sgi = false;
+	rate->ldpc = false;
+	rate->bw = RATE_MCS_CHAN_WIDTH_20;
+
+	rate->index = find_first_bit(&lq_sta->active_legacy_rate,
+				     BITS_PER_LONG);
+
+	if (band == IEEE80211_BAND_5GHZ) {
+		rate->type = LQ_LEGACY_A;
+		initial_rates = rs_init_rates_5ghz;
+		nentries = ARRAY_SIZE(rs_init_rates_5ghz);
+	} else {
+		rate->type = LQ_LEGACY_G;
+		initial_rates = rs_init_rates_24ghz;
+		nentries = ARRAY_SIZE(rs_init_rates_24ghz);
+	}
+
+	if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
+		for (i = 0; i < nentries; i++) {
+			int rate_idx = initial_rates[i].rate_idx;
+			if ((best_rssi >= initial_rates[i].rssi) &&
+			    (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
+				rate->index = rate_idx;
+				break;
+			}
+		}
+	}
+
+	IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
+		       rs_pretty_ant(rate->ant));
+}
+
+/* Save info about RSSI of last Rx */
+void rs_update_last_rssi(struct iwl_mvm *mvm,
+			 struct iwl_lq_sta *lq_sta,
+			 struct ieee80211_rx_status *rx_status)
+{
+	lq_sta->pers.chains = rx_status->chains;
+	lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
+	lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
+	lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
+}
+
 /**
  * rs_initialize_lq - Initialize a station's hardware rate table
  *
@@ -2310,17 +2403,11 @@ static void rs_initialize_lq(struct iwl_mvm *mvm,
 {
 	struct iwl_scale_tbl_info *tbl;
 	struct rs_rate *rate;
-	int i;
 	u8 active_tbl = 0;
-	u8 valid_tx_ant;
 
 	if (!sta || !lq_sta)
 		return;
 
-	i = lq_sta->last_txrate_idx;
-
-	valid_tx_ant = mvm->fw->valid_tx_ant;
-
 	if (!lq_sta->search_better_tbl)
 		active_tbl = lq_sta->active_tbl;
 	else
@@ -2329,18 +2416,8 @@ static void rs_initialize_lq(struct iwl_mvm *mvm,
 	tbl = &(lq_sta->lq_info[active_tbl]);
 	rate = &tbl->rate;
 
-	if ((i < 0) || (i >= IWL_RATE_COUNT))
-		i = 0;
-
-	rate->index = i;
-	rate->ant = first_antenna(valid_tx_ant);
-	rate->sgi = false;
-	rate->ldpc = false;
-	rate->bw = RATE_MCS_CHAN_WIDTH_20;
-	if (band == IEEE80211_BAND_5GHZ)
-		rate->type = LQ_LEGACY_A;
-	else
-		rate->type = LQ_LEGACY_G;
+	rs_get_initial_rate(mvm, lq_sta, band, rate);
+	lq_sta->last_txrate_idx = rate->index;
 
 	WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
 	if (rate->ant == ANT_A)
@@ -2397,6 +2474,8 @@ static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
 	lq_sta->pers.dbg_fixed_rate = 0;
 	lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
 #endif
+	lq_sta->pers.chains = 0;
+	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
 
 	return &sta_priv->lq_sta;
 }
@@ -2630,11 +2709,6 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 
 	/* as default allow aggregation for all tids */
 	lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
-
-	/* Set last_txrate_idx to lowest rate */
-	lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
-	if (sband->band == IEEE80211_BAND_5GHZ)
-		lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
 	lq_sta->is_agg = 0;
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
@@ -3238,7 +3312,7 @@ static void rs_rate_init_stub(void *mvm_r,
 
 static const struct rate_control_ops rs_mvm_ops = {
 	.name = RS_NAME,
-	.tx_status = rs_tx_status,
+	.tx_status = rs_mac80211_tx_status,
 	.get_rate = rs_get_rate,
 	.rate_init = rs_rate_init_stub,
 	.alloc = rs_alloc,