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From 827327792c4b0d4d4909ec27bd56cb3ba8f2b754 Mon Sep 17 00:00:00 2001
From: Ivo van Doorn <IvDoorn@gmail.com>
Date: Sat, 14 Mar 2009 20:06:48 +0100
Subject: [PATCH] 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>
---
drivers/net/wireless/rt2x00/Kconfig | 3 +
drivers/net/wireless/rt2x00/Makefile | 1 +
drivers/net/wireless/rt2x00/rt2x00.h | 4 +
drivers/net/wireless/rt2x00/rt2x00config.c | 5 ++
drivers/net/wireless/rt2x00/rt2x00dev.c | 91 ++++++++++++++++++++-------
drivers/net/wireless/rt2x00/rt2x00ht.c | 69 +++++++++++++++++++++
drivers/net/wireless/rt2x00/rt2x00lib.h | 24 +++++++
drivers/net/wireless/rt2x00/rt2x00queue.c | 1 +
drivers/net/wireless/rt2x00/rt2x00queue.h | 33 ++++++++--
9 files changed, 201 insertions(+), 30 deletions(-)
create mode 100644 drivers/net/wireless/rt2x00/rt2x00ht.c
--- 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
@@ -357,6 +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;
@@ -370,6 +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;
};
/*
@@ -606,6 +609,7 @@ 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 +173,11 @@ void rt2x00lib_config(struct rt2x00_dev
libconf.conf = conf;
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
+ if (conf_is_ht40(conf))
+ __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
@@ -316,18 +316,54 @@ void rt2x00lib_txdone(struct queue_entry
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
+static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
+ struct rxdone_entry_desc *rxdesc)
+{
+ struct ieee80211_supported_band *sband;
+ const struct rt2x00_rate *rate;
+ unsigned int i;
+ int signal;
+ int type;
+
+ /*
+ * For non-HT rates the MCS value needs to contain the
+ * actually used rate modulation (CCK or OFDM).
+ */
+ if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
+ signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
+ else
+ signal = rxdesc->signal;
+
+ type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
+
+ sband = &rt2x00dev->bands[rt2x00dev->curr_band];
+ for (i = 0; i < sband->n_bitrates; i++) {
+ rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
+
+ if (((type == RXDONE_SIGNAL_PLCP) &&
+ (rate->plcp == signal)) ||
+ ((type == RXDONE_SIGNAL_BITRATE) &&
+ (rate->bitrate == signal)) ||
+ ((type == RXDONE_SIGNAL_MCS) &&
+ (rate->mcs == signal))) {
+ return i;
+ }
+ }
+
+ WARNING(rt2x00dev, "Frame received with unrecognized signal, "
+ "signal=0x%.4x, type=%d.\n", signal, type);
+ return 0;
+}
+
void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
struct queue_entry *entry)
{
struct rxdone_entry_desc rxdesc;
struct sk_buff *skb;
struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
- struct ieee80211_supported_band *sband;
- const struct rt2x00_rate *rate;
unsigned int header_length;
unsigned int align;
- unsigned int i;
- int idx = -1;
+ int rate_idx;
/*
* Allocate a new sk_buffer. If no new buffer available, drop the
@@ -376,26 +412,17 @@ void rt2x00lib_rxdone(struct rt2x00_dev
skb_trim(entry->skb, rxdesc.size);
/*
- * Update RX statistics.
- */
- sband = &rt2x00dev->bands[rt2x00dev->curr_band];
- for (i = 0; i < sband->n_bitrates; i++) {
- rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
-
- if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
- (rate->plcp == rxdesc.signal)) ||
- ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
- (rate->bitrate == rxdesc.signal))) {
- idx = i;
- break;
- }
- }
-
- if (idx < 0) {
- WARNING(rt2x00dev, "Frame received with unrecognized signal,"
- "signal=0x%.2x, type=%d.\n", rxdesc.signal,
- (rxdesc.dev_flags & RXDONE_SIGNAL_MASK));
- idx = 0;
+ * Check if the frame was received using HT. In that case,
+ * the rate is the MCS index and should be passed to mac80211
+ * directly. Otherwise we need to translate the signal to
+ * the correct bitrate index.
+ */
+ if (rxdesc.rate_mode == RATE_MODE_CCK ||
+ rxdesc.rate_mode == RATE_MODE_OFDM) {
+ rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
+ } else {
+ rxdesc.flags |= RX_FLAG_HT;
+ rate_idx = rxdesc.signal;
}
/*
@@ -405,7 +432,7 @@ void rt2x00lib_rxdone(struct rt2x00_dev
rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
rx_status->mactime = rxdesc.timestamp;
- rx_status->rate_idx = idx;
+ rx_status->rate_idx = rate_idx;
rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
rx_status->signal = rxdesc.rssi;
rx_status->noise = rxdesc.noise;
@@ -440,72 +467,84 @@ 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),
},
};
@@ -581,6 +620,8 @@ 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));
}
/*
@@ -597,6 +638,8 @@ 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 - 2009 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,
+ const struct rt2x00_rate *hwrate)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
+ struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
+
+ if (tx_info->control.sta)
+ txdesc->mpdu_density =
+ tx_info->control.sta->ht_cap.ampdu_density;
+ else
+ txdesc->mpdu_density = 0;
+
+ txdesc->ba_size = 7; /* FIXME: What value is needed? */
+ txdesc->stbc = 0; /* FIXME: What value is needed? */
+
+ txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
+ if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+ 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 (txrate->flags & IEEE80211_TX_RC_MCS)
+ txdesc->rate_mode = RATE_MODE_HT_MIX;
+ if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
+ txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
+ if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
+ if (txrate->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];
@@ -57,6 +58,14 @@ static inline const struct rt2x00_rate *
return &rt2x00_supported_rates[hw_value & 0xff];
}
+#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,
+ const struct rt2x00_rate *hwrate);
+#else
+static inline void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
+ struct txentry_desc *txdesc,
+ const struct rt2x00_rate *hwrate)
+{
+}
+#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
@@ -326,6 +326,7 @@ static void rt2x00queue_create_tx_descri
* Apply TX descriptor handling by components
*/
rt2x00crypto_create_tx_descriptor(entry, txdesc);
+ rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
}
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -35,9 +35,12 @@
* for USB devices this restriction does not apply, but the value of
* 2432 makes sense since it is big enough to contain the maximum fragment
* size according to the ieee802.11 specs.
+ * The aggregation size depends on support from the driver, but should
+ * be something around 3840 bytes.
*/
-#define DATA_FRAME_SIZE 2432
-#define MGMT_FRAME_SIZE 256
+#define DATA_FRAME_SIZE 2432
+#define MGMT_FRAME_SIZE 256
+#define AGGREGATION_SIZE 3840
/**
* DOC: Number of entries per queue
@@ -145,6 +148,7 @@ 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 +156,10 @@ 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 +168,7 @@ 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
@@ -177,6 +182,7 @@ enum rxdone_entry_desc_flags {
* @size: Data size of the received frame.
* @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
* @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
+ * @rate_mode: Rate mode (See @enum rate_modulation).
* @cipher: Cipher type used during decryption.
* @cipher_status: Decryption status.
* @iv: IV/EIV data used during decryption.
@@ -190,6 +196,7 @@ struct rxdone_entry_desc {
int size;
int flags;
int dev_flags;
+ u16 rate_mode;
u8 cipher;
u8 cipher_status;
@@ -243,6 +250,9 @@ 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 +268,9 @@ 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 +284,11 @@ 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 +308,11 @@ 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;
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