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rt2x00: Implement support for 802.11n

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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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2009-04-26 16:09:32 +02:00 committed by John W. Linville
parent 9f1661718c
commit 35f00cfcc0
9 changed files with 211 additions and 34 deletions
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3
drivers/net/wireless/rt2x00/Kconfig
View File

@ -88,6 +88,9 @@ config RT2X00_LIB_USB
config RT2X00_LIB
tristate
config RT2X00_LIB_HT
boolean
config RT2X00_LIB_FIRMWARE
boolean
select FW_LOADER

1
drivers/net/wireless/rt2x00/Makefile
View File

@ -8,6 +8,7 @@ rt2x00lib-$(CONFIG_RT2X00_LIB_CRYPTO) += rt2x00crypto.o
rt2x00lib-$(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

11
drivers/net/wireless/rt2x00/rt2x00.h
View File

@ -366,6 +366,7 @@ static inline struct rt2x00_intf* vif_to_intf(struct ieee80211_vif *vif)
* 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;
@ -379,6 +380,8 @@ 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;
};
/*
@ -616,6 +619,7 @@ enum rt2x00_flags {
CONFIG_EXTERNAL_LNA_BG,
CONFIG_DOUBLE_ANTENNA,
CONFIG_DISABLE_LINK_TUNING,
CONFIG_CHANNEL_HT40,
};
/*
@ -787,6 +791,13 @@ struct rt2x00_dev {
*/
u8 freq_offset;
/*
* Calibration information (for rt2800usb & rt2800pci).
* [0] -> BW20
* [1] -> BW40
*/
u8 calibration[2];
/*
* Low level statistics which will have
* to be kept up to date while device is running.

5
drivers/net/wireless/rt2x00/rt2x00config.c
View File

@ -173,6 +173,11 @@ void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
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));

92
drivers/net/wireless/rt2x00/rt2x00dev.c
View File

@ -323,19 +323,54 @@ void rt2x00lib_txdone(struct queue_entry *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;
bool l2pad;
unsigned int i;
int idx = -1;
int rate_idx;
/*
* Allocate a new sk_buffer. If no new buffer available, drop the
* received frame and reuse the existing buffer.
@ -379,26 +414,17 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
rt2x00queue_payload_align(entry->skb, l2pad, header_length);
/*
* Update RX statistics.
* 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.
*/
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;
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;
}
/*
@ -408,7 +434,7 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
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;
@ -443,72 +469,84 @@ const struct rt2x00_rate rt2x00_supported_rates[12] = {
.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),
},
};
@ -584,6 +622,8 @@ static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
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));
}
/*
@ -600,6 +640,8 @@ static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
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;

69
drivers/net/wireless/rt2x00/rt2x00ht.c Normal file
View File

@ -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);
}

24
drivers/net/wireless/rt2x00/rt2x00lib.h
View File

@ -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 *rt2x00_get_rate(const u16 hw_value)
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.
*/
@ -359,6 +368,21 @@ static inline void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, bool l2pad,
}
#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.
*/

1
drivers/net/wireless/rt2x00/rt2x00queue.c
View File

@ -361,6 +361,7 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
* 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);
}

39
drivers/net/wireless/rt2x00/rt2x00queue.h
View File

@ -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
@ -148,18 +151,20 @@ static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb)
*
* @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.
* @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary.
*/
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_L2PAD = 1 << 5,
RXDONE_SIGNAL_PLCP = BIT(0),
RXDONE_SIGNAL_BITRATE = BIT(1),
RXDONE_SIGNAL_MCS = BIT(2),
RXDONE_MY_BSS = BIT(3),
RXDONE_CRYPTO_IV = BIT(4),
RXDONE_CRYPTO_ICV = BIT(5),
RXDONE_L2PAD = BIT(6),
};
/**
@ -168,7 +173,7 @@ 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
@ -182,6 +187,7 @@ 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.
@ -195,6 +201,7 @@ struct rxdone_entry_desc {
int size;
int flags;
int dev_flags;
u16 rate_mode;
u8 cipher;
u8 cipher_status;
@ -248,6 +255,9 @@ 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,
@ -263,6 +273,9 @@ 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,
};
/**
@ -278,7 +291,11 @@ 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.
@ -302,7 +319,11 @@ 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;