path: root/package/mac80211/patches/310-rt2x00_implement_support_for_802.11n.patch

From: Ivo van Doorn <IvDoorn@gmail.com>
Date: Sun, 28 Dec 2008 12:48:46 +0000 (+0100)
Subject: rt2x00: Implement support for 802.11n
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fivd%2Frt2x00.git;a=commitdiff_plain;h=1ddf4bdad5f51a799ee580e125dda19dd18daa39

rt2x00: Implement support for 802.11n

Extend rt2x00lib capabilities to support 802.11n,
it still lacks aggregation support, but that can
be added in the future.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
---

--- a/drivers/net/wireless/rt2x00/Makefile
+++ b/drivers/net/wireless/rt2x00/Makefile
@@ -8,6 +8,7 @@ rt2x00lib-$(CONFIG_RT2X00_LIB_CRYPTO)	+=
 rt2x00lib-$(CONFIG_RT2X00_LIB_RFKILL)	+= rt2x00rfkill.o
 rt2x00lib-$(CONFIG_RT2X00_LIB_FIRMWARE)	+= rt2x00firmware.o
 rt2x00lib-$(CONFIG_RT2X00_LIB_LEDS)	+= rt2x00leds.o
+rt2x00lib-$(CONFIG_RT2X00_LIB_HT)	+= rt2x00ht.o
 
 obj-$(CONFIG_RT2X00_LIB)		+= rt2x00lib.o
 obj-$(CONFIG_RT2X00_LIB_PCI)		+= rt2x00pci.o
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -107,6 +107,7 @@
  */
 #define ACK_SIZE		14
 #define IEEE80211_HEADER	24
+#define AGGREGATION_SIZE	3840
 #define PLCP			48
 #define BEACON			100
 #define PREAMBLE		144
@@ -356,6 +357,7 @@ static inline struct rt2x00_intf* vif_to
  *	for @tx_power_a, @tx_power_bg and @channels.
  * @channels: Device/chipset specific channel values (See &struct rf_channel).
  * @channels_info: Additional information for channels (See &struct channel_info).
+ * @ht: Driver HT Capabilities (See &ieee80211_sta_ht_cap).
  */
 struct hw_mode_spec {
 	unsigned int supported_bands;
@@ -369,6 +371,8 @@ struct hw_mode_spec {
 	unsigned int num_channels;
 	const struct rf_channel *channels;
 	const struct channel_info *channels_info;
+
+	struct ieee80211_sta_ht_cap ht;
 };
 
 /*
@@ -603,6 +607,7 @@ enum rt2x00_flags {
 	CONFIG_EXTERNAL_LNA_BG,
 	CONFIG_DOUBLE_ANTENNA,
 	CONFIG_DISABLE_LINK_TUNING,
+	CONFIG_CHANNEL_HT40,
 };
 
 /*
--- a/drivers/net/wireless/rt2x00/rt2x00config.c
+++ b/drivers/net/wireless/rt2x00/rt2x00config.c
@@ -173,6 +173,12 @@ void rt2x00lib_config(struct rt2x00_dev 
 	libconf.conf = conf;
 
 	if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
+		if ((conf->ht.channel_type == NL80211_CHAN_HT40MINUS) ||
+		    (conf->ht.channel_type == NL80211_CHAN_HT40PLUS))
+			__set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
+		else
+			__clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
+
 		memcpy(&libconf.rf,
 		       &rt2x00dev->spec.channels[conf->channel->hw_value],
 		       sizeof(libconf.rf));
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -384,7 +384,9 @@ void rt2x00lib_rxdone(struct rt2x00_dev 
 		if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
 		     (rate->plcp == rxdesc.signal)) ||
 		    ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
-		      (rate->bitrate == rxdesc.signal))) {
+		      (rate->bitrate == rxdesc.signal)) ||
+		    ((rxdesc.dev_flags & RXDONE_SIGNAL_MCS) &&
+		      (rate->mcs == rxdesc.signal))) {
 			idx = i;
 			break;
 		}
@@ -439,72 +441,84 @@ const struct rt2x00_rate rt2x00_supporte
 		.bitrate = 10,
 		.ratemask = BIT(0),
 		.plcp = 0x00,
+		.mcs = RATE_MCS(RATE_MODE_CCK, 0),
 	},
 	{
 		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 		.bitrate = 20,
 		.ratemask = BIT(1),
 		.plcp = 0x01,
+		.mcs = RATE_MCS(RATE_MODE_CCK, 1),
 	},
 	{
 		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 		.bitrate = 55,
 		.ratemask = BIT(2),
 		.plcp = 0x02,
+		.mcs = RATE_MCS(RATE_MODE_CCK, 2),
 	},
 	{
 		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
 		.bitrate = 110,
 		.ratemask = BIT(3),
 		.plcp = 0x03,
+		.mcs = RATE_MCS(RATE_MODE_CCK, 3),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 60,
 		.ratemask = BIT(4),
 		.plcp = 0x0b,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 0),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 90,
 		.ratemask = BIT(5),
 		.plcp = 0x0f,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 1),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 120,
 		.ratemask = BIT(6),
 		.plcp = 0x0a,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 2),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 180,
 		.ratemask = BIT(7),
 		.plcp = 0x0e,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 3),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 240,
 		.ratemask = BIT(8),
 		.plcp = 0x09,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 4),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 360,
 		.ratemask = BIT(9),
 		.plcp = 0x0d,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 5),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 480,
 		.ratemask = BIT(10),
 		.plcp = 0x08,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 6),
 	},
 	{
 		.flags = DEV_RATE_OFDM,
 		.bitrate = 540,
 		.ratemask = BIT(11),
 		.plcp = 0x0c,
+		.mcs = RATE_MCS(RATE_MODE_OFDM, 7),
 	},
 };
 
@@ -582,6 +596,8 @@ static int rt2x00lib_probe_hw_modes(stru
 		rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
 		hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 		    &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
+		memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
+		       &spec->ht, sizeof(spec->ht));
 	}
 
 	/*
@@ -598,6 +614,8 @@ static int rt2x00lib_probe_hw_modes(stru
 		rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
 		hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 		    &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
+		memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
+		       &spec->ht, sizeof(spec->ht));
 	}
 
 	return 0;
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00ht.c
@@ -0,0 +1,69 @@
+/*
+	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
+	<http://rt2x00.serialmonkey.com>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the
+	Free Software Foundation, Inc.,
+	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+	Module: rt2x00lib
+	Abstract: rt2x00 HT specific routines.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
+				   struct txentry_desc *txdesc,
+				   struct ieee80211_rate *rate)
+{
+	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
+	const struct rt2x00_rate *hwrate = rt2x00_get_rate(rate->hw_value);
+
+	if (tx_info->control.sta)
+		txdesc->mpdu_density =
+		    tx_info->control.sta->ht_cap.ampdu_density;
+	else
+		txdesc->mpdu_density = 0;
+
+	txdesc->ba_size = 0;	/* FIXME: What value is needed? */
+	txdesc->stbc = 0;	/* FIXME: What value is needed? */
+
+	txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
+	if (rt2x00_get_rate_preamble(rate->hw_value))
+		txdesc->mcs |= 0x08;
+
+	/*
+	 * Convert flags
+	 */
+	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
+		__set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
+
+	/*
+	 * Determine HT Mix/Greenfield rate mode
+	 */
+	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
+		txdesc->rate_mode = RATE_MODE_HT_MIX;
+	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
+		txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
+	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+		__set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
+	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
+		__set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
+}
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -48,6 +48,7 @@ struct rt2x00_rate {
 	unsigned short ratemask;
 
 	unsigned short plcp;
+	unsigned short mcs;
 };
 
 extern const struct rt2x00_rate rt2x00_supported_rates[12];
@@ -68,6 +69,14 @@ static inline int rt2x00_get_rate_preamb
 	return (hw_value & 0xff00);
 }
 
+#define RATE_MCS(__mode, __mcs) \
+	( (((__mode) & 0x00ff) << 8) | ((__mcs) & 0x00ff) )
+
+static inline int rt2x00_get_rate_mcs(const u16 mcs_value)
+{
+	return (mcs_value & 0x00ff);
+}
+
 /*
  * Radio control handlers.
  */
@@ -341,6 +350,21 @@ static inline void rt2x00crypto_rx_inser
 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
 
 /*
+ * HT handlers.
+ */
+#ifdef CONFIG_RT2X00_LIB_HT
+void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
+				   struct txentry_desc *txdesc,
+				   struct ieee80211_rate *rate);
+#else
+static inline void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
+						 struct txentry_desc *txdesc,
+						 struct ieee80211_rate *rate)
+{
+}
+#endif /* CONFIG_RT2X00_LIB_HT */
+
+/*
  * RFkill handlers.
  */
 #ifdef CONFIG_RT2X00_LIB_RFKILL
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -325,6 +325,7 @@ static void rt2x00queue_create_tx_descri
 	 * Apply TX descriptor handling by components
 	 */
 	rt2x00crypto_create_tx_descriptor(entry, txdesc);
+	rt2x00ht_create_tx_descriptor(entry, txdesc, rate);
 	rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
 	rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, rate);
 }
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -145,6 +145,7 @@ static inline struct skb_frame_desc* get
  *
  * @RXDONE_SIGNAL_PLCP: Signal field contains the plcp value.
  * @RXDONE_SIGNAL_BITRATE: Signal field contains the bitrate value.
+ * @RXDONE_SIGNAL_MCS: Signal field contains the mcs value.
  * @RXDONE_MY_BSS: Does this frame originate from device's BSS.
  * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
  * @RXDONE_CRYPTO_ICV: Driver provided ICV data.
@@ -152,9 +153,10 @@ static inline struct skb_frame_desc* get
 enum rxdone_entry_desc_flags {
 	RXDONE_SIGNAL_PLCP = 1 << 0,
 	RXDONE_SIGNAL_BITRATE = 1 << 1,
-	RXDONE_MY_BSS = 1 << 2,
-	RXDONE_CRYPTO_IV = 1 << 3,
-	RXDONE_CRYPTO_ICV = 1 << 4,
+	RXDONE_SIGNAL_MCS = 1 << 2,
+	RXDONE_MY_BSS = 1 << 3,
+	RXDONE_CRYPTO_IV = 1 << 4,
+	RXDONE_CRYPTO_ICV = 1 << 5,
 };
 
 /**
@@ -163,7 +165,7 @@ enum rxdone_entry_desc_flags {
  * from &rxdone_entry_desc to a signal value type.
  */
 #define RXDONE_SIGNAL_MASK \
-       ( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE )
+	( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE | RXDONE_SIGNAL_MCS )
 
 /**
  * struct rxdone_entry_desc: RX Entry descriptor
@@ -243,6 +245,9 @@ struct txdone_entry_desc {
  * @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
  * @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
  * @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
+ * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
+ * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
+ * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
  */
 enum txentry_desc_flags {
 	ENTRY_TXD_RTS_FRAME,
@@ -258,6 +263,9 @@ enum txentry_desc_flags {
 	ENTRY_TXD_ENCRYPT_PAIRWISE,
 	ENTRY_TXD_ENCRYPT_IV,
 	ENTRY_TXD_ENCRYPT_MMIC,
+	ENTRY_TXD_HT_AMPDU,
+	ENTRY_TXD_HT_BW_40,
+	ENTRY_TXD_HT_SHORT_GI,
 };
 
 /**
@@ -271,7 +279,11 @@ enum txentry_desc_flags {
  * @length_low: PLCP length low word.
  * @signal: PLCP signal.
  * @service: PLCP service.
+ * @msc: MCS.
+ * @stbc: STBC.
+ * @ba_size: BA size.
  * @rate_mode: Rate mode (See @enum rate_modulation).
+ * @mpdu_density: MDPU density.
  * @retry_limit: Max number of retries.
  * @aifs: AIFS value.
  * @ifs: IFS value.
@@ -291,7 +303,11 @@ struct txentry_desc {
 	u16 signal;
 	u16 service;
 
+	u16 mcs;
+	u16 stbc;
+	u16 ba_size;
 	u16 rate_mode;
+	u16 mpdu_density;
 
 	short retry_limit;
 	short aifs;