523 lines
16 KiB
Diff
523 lines
16 KiB
Diff
From 2c0af6ef6263ad5b581429953ad1b98e6d522e69 Mon Sep 17 00:00:00 2001
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From: Ivo van Doorn <IvDoorn@gmail.com>
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Date: Wed, 4 Feb 2009 20:10:23 +0100
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Subject: [PATCH] rt2x00: Implement support for 802.11n
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Extend rt2x00lib capabilities to support 802.11n,
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it still lacks aggregation support, but that can
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be added in the future.
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Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
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---
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drivers/net/wireless/rt2x00/Kconfig | 3 +
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drivers/net/wireless/rt2x00/Makefile | 1 +
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drivers/net/wireless/rt2x00/rt2x00.h | 4 +
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drivers/net/wireless/rt2x00/rt2x00config.c | 5 ++
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drivers/net/wireless/rt2x00/rt2x00dev.c | 91 ++++++++++++++++++++-------
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drivers/net/wireless/rt2x00/rt2x00ht.c | 69 +++++++++++++++++++++
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drivers/net/wireless/rt2x00/rt2x00lib.h | 24 +++++++
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drivers/net/wireless/rt2x00/rt2x00queue.c | 1 +
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drivers/net/wireless/rt2x00/rt2x00queue.h | 33 ++++++++--
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9 files changed, 201 insertions(+), 30 deletions(-)
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create mode 100644 drivers/net/wireless/rt2x00/rt2x00ht.c
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--- a/drivers/net/wireless/rt2x00/Makefile
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+++ b/drivers/net/wireless/rt2x00/Makefile
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@@ -8,6 +8,7 @@ rt2x00lib-$(CONFIG_RT2X00_LIB_CRYPTO) +=
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rt2x00lib-$(CONFIG_RT2X00_LIB_RFKILL) += rt2x00rfkill.o
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rt2x00lib-$(CONFIG_RT2X00_LIB_FIRMWARE) += rt2x00firmware.o
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rt2x00lib-$(CONFIG_RT2X00_LIB_LEDS) += rt2x00leds.o
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+rt2x00lib-$(CONFIG_RT2X00_LIB_HT) += rt2x00ht.o
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obj-$(CONFIG_RT2X00_LIB) += rt2x00lib.o
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obj-$(CONFIG_RT2X00_LIB_PCI) += rt2x00pci.o
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--- a/drivers/net/wireless/rt2x00/rt2x00.h
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+++ b/drivers/net/wireless/rt2x00/rt2x00.h
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@@ -357,6 +357,7 @@ static inline struct rt2x00_intf* vif_to
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* for @tx_power_a, @tx_power_bg and @channels.
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* @channels: Device/chipset specific channel values (See &struct rf_channel).
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* @channels_info: Additional information for channels (See &struct channel_info).
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+ * @ht: Driver HT Capabilities (See &ieee80211_sta_ht_cap).
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*/
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struct hw_mode_spec {
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unsigned int supported_bands;
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@@ -370,6 +371,8 @@ struct hw_mode_spec {
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unsigned int num_channels;
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const struct rf_channel *channels;
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const struct channel_info *channels_info;
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+
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+ struct ieee80211_sta_ht_cap ht;
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};
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/*
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@@ -606,6 +609,7 @@ enum rt2x00_flags {
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CONFIG_EXTERNAL_LNA_BG,
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CONFIG_DOUBLE_ANTENNA,
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CONFIG_DISABLE_LINK_TUNING,
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+ CONFIG_CHANNEL_HT40,
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};
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/*
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--- a/drivers/net/wireless/rt2x00/rt2x00config.c
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+++ b/drivers/net/wireless/rt2x00/rt2x00config.c
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@@ -173,6 +173,11 @@ void rt2x00lib_config(struct rt2x00_dev
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libconf.conf = conf;
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if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
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+ if (conf_is_ht40(conf))
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+ __set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
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+ else
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+ __clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
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+
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memcpy(&libconf.rf,
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&rt2x00dev->spec.channels[conf->channel->hw_value],
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sizeof(libconf.rf));
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--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
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+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
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@@ -316,18 +316,54 @@ void rt2x00lib_txdone(struct queue_entry
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}
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EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
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+static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
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+ struct rxdone_entry_desc *rxdesc)
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+{
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+ struct ieee80211_supported_band *sband;
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+ const struct rt2x00_rate *rate;
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+ unsigned int i;
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+ int signal;
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+ int type;
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+
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+ /*
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+ * For non-HT rates the MCS value needs to contain the
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+ * actually used rate modulation (CCK or OFDM).
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+ */
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+ if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
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+ signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
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+ else
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+ signal = rxdesc->signal;
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+
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+ type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
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+
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+ sband = &rt2x00dev->bands[rt2x00dev->curr_band];
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+ for (i = 0; i < sband->n_bitrates; i++) {
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+ rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
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+
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+ if (((type == RXDONE_SIGNAL_PLCP) &&
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+ (rate->plcp == signal)) ||
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+ ((type == RXDONE_SIGNAL_BITRATE) &&
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+ (rate->bitrate == signal)) ||
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+ ((type == RXDONE_SIGNAL_MCS) &&
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+ (rate->mcs == signal))) {
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+ return i;
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+ }
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+ }
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+
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+ WARNING(rt2x00dev, "Frame received with unrecognized signal, "
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+ "signal=0x%.4x, type=%d.\n", signal, type);
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+ return 0;
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+}
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+
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void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
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struct queue_entry *entry)
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{
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struct rxdone_entry_desc rxdesc;
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struct sk_buff *skb;
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struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
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- struct ieee80211_supported_band *sband;
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- const struct rt2x00_rate *rate;
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unsigned int header_length;
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unsigned int align;
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- unsigned int i;
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- int idx = -1;
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+ int rate_idx;
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/*
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* Allocate a new sk_buffer. If no new buffer available, drop the
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@@ -376,26 +412,17 @@ void rt2x00lib_rxdone(struct rt2x00_dev
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skb_trim(entry->skb, rxdesc.size);
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/*
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- * Update RX statistics.
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- */
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- sband = &rt2x00dev->bands[rt2x00dev->curr_band];
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- for (i = 0; i < sband->n_bitrates; i++) {
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- rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
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-
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- if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
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- (rate->plcp == rxdesc.signal)) ||
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- ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
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- (rate->bitrate == rxdesc.signal))) {
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- idx = i;
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- break;
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- }
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- }
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-
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- if (idx < 0) {
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- WARNING(rt2x00dev, "Frame received with unrecognized signal,"
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- "signal=0x%.2x, type=%d.\n", rxdesc.signal,
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- (rxdesc.dev_flags & RXDONE_SIGNAL_MASK));
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- idx = 0;
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+ * Check if the frame was received using HT. In that case,
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+ * the rate is the MCS index and should be passed to mac80211
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+ * directly. Otherwise we need to translate the signal to
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+ * the correct bitrate index.
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+ */
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+ if (rxdesc.rate_mode == RATE_MODE_CCK ||
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+ rxdesc.rate_mode == RATE_MODE_OFDM) {
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+ rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
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+ } else {
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+ rxdesc.flags |= RX_FLAG_HT;
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+ rate_idx = rxdesc.signal;
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}
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/*
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@@ -405,7 +432,7 @@ void rt2x00lib_rxdone(struct rt2x00_dev
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rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
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rx_status->mactime = rxdesc.timestamp;
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- rx_status->rate_idx = idx;
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+ rx_status->rate_idx = rate_idx;
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rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
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rx_status->signal = rxdesc.rssi;
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rx_status->noise = rxdesc.noise;
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@@ -440,72 +467,84 @@ const struct rt2x00_rate rt2x00_supporte
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.bitrate = 10,
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.ratemask = BIT(0),
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.plcp = 0x00,
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+ .mcs = RATE_MCS(RATE_MODE_CCK, 0),
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},
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{
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.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
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.bitrate = 20,
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.ratemask = BIT(1),
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.plcp = 0x01,
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+ .mcs = RATE_MCS(RATE_MODE_CCK, 1),
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},
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{
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.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
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.bitrate = 55,
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.ratemask = BIT(2),
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.plcp = 0x02,
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+ .mcs = RATE_MCS(RATE_MODE_CCK, 2),
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},
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{
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.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
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.bitrate = 110,
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.ratemask = BIT(3),
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.plcp = 0x03,
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+ .mcs = RATE_MCS(RATE_MODE_CCK, 3),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 60,
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.ratemask = BIT(4),
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.plcp = 0x0b,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 90,
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.ratemask = BIT(5),
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.plcp = 0x0f,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 120,
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.ratemask = BIT(6),
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.plcp = 0x0a,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 180,
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.ratemask = BIT(7),
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.plcp = 0x0e,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 240,
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.ratemask = BIT(8),
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.plcp = 0x09,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 360,
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.ratemask = BIT(9),
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.plcp = 0x0d,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 480,
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.ratemask = BIT(10),
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.plcp = 0x08,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
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},
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{
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.flags = DEV_RATE_OFDM,
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.bitrate = 540,
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.ratemask = BIT(11),
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.plcp = 0x0c,
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+ .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
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},
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};
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@@ -581,6 +620,8 @@ static int rt2x00lib_probe_hw_modes(stru
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rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
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hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
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&rt2x00dev->bands[IEEE80211_BAND_2GHZ];
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+ memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
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+ &spec->ht, sizeof(spec->ht));
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}
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/*
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@@ -597,6 +638,8 @@ static int rt2x00lib_probe_hw_modes(stru
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rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
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hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
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&rt2x00dev->bands[IEEE80211_BAND_5GHZ];
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+ memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
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+ &spec->ht, sizeof(spec->ht));
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}
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return 0;
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--- /dev/null
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+++ b/drivers/net/wireless/rt2x00/rt2x00ht.c
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@@ -0,0 +1,69 @@
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+/*
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+ Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
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+ <http://rt2x00.serialmonkey.com>
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program; if not, write to the
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+ Free Software Foundation, Inc.,
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+ 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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+ */
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+
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+/*
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+ Module: rt2x00lib
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+ Abstract: rt2x00 HT specific routines.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+
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+#include "rt2x00.h"
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+#include "rt2x00lib.h"
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+
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+void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
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+ struct txentry_desc *txdesc,
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+ const struct rt2x00_rate *hwrate)
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+{
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+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
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+ struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
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+
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+ if (tx_info->control.sta)
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+ txdesc->mpdu_density =
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+ tx_info->control.sta->ht_cap.ampdu_density;
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+ else
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+ txdesc->mpdu_density = 0;
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+
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+ txdesc->ba_size = 7; /* FIXME: What value is needed? */
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+ txdesc->stbc = 0; /* FIXME: What value is needed? */
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+
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+ txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
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+ if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
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+ txdesc->mcs |= 0x08;
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+
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+ /*
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+ * Convert flags
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+ */
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+ if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
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+ __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
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+
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+ /*
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+ * Determine HT Mix/Greenfield rate mode
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+ */
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+ if (txrate->flags & IEEE80211_TX_RC_MCS)
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+ txdesc->rate_mode = RATE_MODE_HT_MIX;
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+ if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
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+ txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
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+ if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
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+ __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
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+ if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
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+ __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
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+}
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--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
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+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
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@@ -48,6 +48,7 @@ struct rt2x00_rate {
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unsigned short ratemask;
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unsigned short plcp;
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+ unsigned short mcs;
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};
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extern const struct rt2x00_rate rt2x00_supported_rates[12];
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@@ -57,6 +58,14 @@ static inline const struct rt2x00_rate *
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return &rt2x00_supported_rates[hw_value & 0xff];
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}
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+#define RATE_MCS(__mode, __mcs) \
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+ ( (((__mode) & 0x00ff) << 8) | ((__mcs) & 0x00ff) )
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+
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+static inline int rt2x00_get_rate_mcs(const u16 mcs_value)
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+{
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+ return (mcs_value & 0x00ff);
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+}
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+
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/*
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* Radio control handlers.
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*/
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@@ -341,6 +350,21 @@ static inline void rt2x00crypto_rx_inser
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#endif /* CONFIG_RT2X00_LIB_CRYPTO */
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/*
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+ * HT handlers.
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+ */
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+#ifdef CONFIG_RT2X00_LIB_HT
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+void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
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+ struct txentry_desc *txdesc,
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+ const struct rt2x00_rate *hwrate);
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+#else
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+static inline void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
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+ struct txentry_desc *txdesc,
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+ const struct rt2x00_rate *hwrate)
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+{
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+}
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+#endif /* CONFIG_RT2X00_LIB_HT */
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+
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+/*
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* RFkill handlers.
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*/
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#ifdef CONFIG_RT2X00_LIB_RFKILL
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--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
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+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
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@@ -326,6 +326,7 @@ static void rt2x00queue_create_tx_descri
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* Apply TX descriptor handling by components
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*/
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rt2x00crypto_create_tx_descriptor(entry, txdesc);
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+ rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
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rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
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rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
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}
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--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
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+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
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@@ -35,9 +35,12 @@
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* for USB devices this restriction does not apply, but the value of
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* 2432 makes sense since it is big enough to contain the maximum fragment
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* size according to the ieee802.11 specs.
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+ * The aggregation size depends on support from the driver, but should
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+ * be something around 3840 bytes.
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*/
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-#define DATA_FRAME_SIZE 2432
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-#define MGMT_FRAME_SIZE 256
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+#define DATA_FRAME_SIZE 2432
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+#define MGMT_FRAME_SIZE 256
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+#define AGGREGATION_SIZE 3840
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/**
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* DOC: Number of entries per queue
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@@ -145,6 +148,7 @@ static inline struct skb_frame_desc* get
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*
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* @RXDONE_SIGNAL_PLCP: Signal field contains the plcp value.
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* @RXDONE_SIGNAL_BITRATE: Signal field contains the bitrate value.
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+ * @RXDONE_SIGNAL_MCS: Signal field contains the mcs value.
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* @RXDONE_MY_BSS: Does this frame originate from device's BSS.
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* @RXDONE_CRYPTO_IV: Driver provided IV/EIV data.
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* @RXDONE_CRYPTO_ICV: Driver provided ICV data.
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@@ -152,9 +156,10 @@ static inline struct skb_frame_desc* get
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enum rxdone_entry_desc_flags {
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RXDONE_SIGNAL_PLCP = 1 << 0,
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RXDONE_SIGNAL_BITRATE = 1 << 1,
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- RXDONE_MY_BSS = 1 << 2,
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- RXDONE_CRYPTO_IV = 1 << 3,
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- RXDONE_CRYPTO_ICV = 1 << 4,
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+ RXDONE_SIGNAL_MCS = 1 << 2,
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+ RXDONE_MY_BSS = 1 << 3,
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+ RXDONE_CRYPTO_IV = 1 << 4,
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+ RXDONE_CRYPTO_ICV = 1 << 5,
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};
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/**
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@@ -163,7 +168,7 @@ enum rxdone_entry_desc_flags {
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* from &rxdone_entry_desc to a signal value type.
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*/
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#define RXDONE_SIGNAL_MASK \
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- ( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE )
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+ ( RXDONE_SIGNAL_PLCP | RXDONE_SIGNAL_BITRATE | RXDONE_SIGNAL_MCS )
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/**
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* struct rxdone_entry_desc: RX Entry descriptor
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@@ -177,6 +182,7 @@ enum rxdone_entry_desc_flags {
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* @size: Data size of the received frame.
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* @flags: MAC80211 receive flags (See &enum mac80211_rx_flags).
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* @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
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+ * @rate_mode: Rate mode (See @enum rate_modulation).
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* @cipher: Cipher type used during decryption.
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* @cipher_status: Decryption status.
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* @iv: IV/EIV data used during decryption.
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@@ -190,6 +196,7 @@ struct rxdone_entry_desc {
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int size;
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int flags;
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int dev_flags;
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+ u16 rate_mode;
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u8 cipher;
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u8 cipher_status;
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@@ -243,6 +250,9 @@ struct txdone_entry_desc {
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* @ENTRY_TXD_ENCRYPT_PAIRWISE: Use pairwise key table (instead of shared).
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* @ENTRY_TXD_ENCRYPT_IV: Generate IV/EIV in hardware.
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* @ENTRY_TXD_ENCRYPT_MMIC: Generate MIC in hardware.
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+ * @ENTRY_TXD_HT_AMPDU: This frame is part of an AMPDU.
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+ * @ENTRY_TXD_HT_BW_40: Use 40MHz Bandwidth.
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+ * @ENTRY_TXD_HT_SHORT_GI: Use short GI.
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*/
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enum txentry_desc_flags {
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ENTRY_TXD_RTS_FRAME,
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@@ -258,6 +268,9 @@ enum txentry_desc_flags {
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ENTRY_TXD_ENCRYPT_PAIRWISE,
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ENTRY_TXD_ENCRYPT_IV,
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ENTRY_TXD_ENCRYPT_MMIC,
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+ ENTRY_TXD_HT_AMPDU,
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+ ENTRY_TXD_HT_BW_40,
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+ ENTRY_TXD_HT_SHORT_GI,
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};
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/**
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@@ -271,7 +284,11 @@ enum txentry_desc_flags {
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* @length_low: PLCP length low word.
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* @signal: PLCP signal.
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* @service: PLCP service.
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+ * @msc: MCS.
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+ * @stbc: STBC.
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+ * @ba_size: BA size.
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* @rate_mode: Rate mode (See @enum rate_modulation).
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+ * @mpdu_density: MDPU density.
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* @retry_limit: Max number of retries.
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* @aifs: AIFS value.
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* @ifs: IFS value.
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@@ -291,7 +308,11 @@ struct txentry_desc {
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u16 signal;
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u16 service;
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+ u16 mcs;
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+ u16 stbc;
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+ u16 ba_size;
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u16 rate_mode;
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+ u16 mpdu_density;
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short retry_limit;
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short aifs;
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