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path: root/drivers/net/wireless/rt2x00/rt2x00mac.c
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Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00mac.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00mac.c438
1 files changed, 438 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
new file mode 100644
index 000000000000..4a6a0bd01ff1
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -0,0 +1,438 @@
+/*
+ Copyright (C) 2004 - 2007 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: rt2x00mac
+ Abstract: rt2x00 generic mac80211 routines.
+ */
+
+/*
+ * Set enviroment defines for rt2x00.h
+ */
+#define DRV_NAME "rt2x00lib"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
+ struct data_ring *ring,
+ struct sk_buff *frag_skb,
+ struct ieee80211_tx_control *control)
+{
+ struct sk_buff *skb;
+ int size;
+
+ if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
+ size = sizeof(struct ieee80211_cts);
+ else
+ size = sizeof(struct ieee80211_rts);
+
+ skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
+ if (!skb) {
+ WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
+ skb_put(skb, size);
+
+ if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
+ ieee80211_ctstoself_get(rt2x00dev->hw, rt2x00dev->interface.id,
+ frag_skb->data, frag_skb->len, control,
+ (struct ieee80211_cts *)(skb->data));
+ else
+ ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
+ frag_skb->data, frag_skb->len, control,
+ (struct ieee80211_rts *)(skb->data));
+
+ if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
+ WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ return NETDEV_TX_OK;
+}
+
+int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
+ struct ieee80211_tx_control *control)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
+ struct data_ring *ring;
+ u16 frame_control;
+
+ /*
+ * Mac80211 might be calling this function while we are trying
+ * to remove the device or perhaps suspending it.
+ * Note that we can only stop the TX queues inside the TX path
+ * due to possible race conditions in mac80211.
+ */
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
+ ieee80211_stop_queues(hw);
+ return 0;
+ }
+
+ /*
+ * Determine which ring to put packet on.
+ */
+ ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
+ if (unlikely(!ring)) {
+ ERROR(rt2x00dev,
+ "Attempt to send packet over invalid queue %d.\n"
+ "Please file bug report to %s.\n",
+ control->queue, DRV_PROJECT);
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ /*
+ * If CTS/RTS is required. and this frame is not CTS or RTS,
+ * create and queue that frame first. But make sure we have
+ * at least enough entries available to send this CTS/RTS
+ * frame as well as the data frame.
+ */
+ frame_control = le16_to_cpu(ieee80211hdr->frame_control);
+ if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
+ (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
+ IEEE80211_TXCTL_USE_CTS_PROTECT))) {
+ if (rt2x00_ring_free(ring) <= 1)
+ return NETDEV_TX_BUSY;
+
+ if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control))
+ return NETDEV_TX_BUSY;
+ }
+
+ if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
+ return NETDEV_TX_BUSY;
+
+ if (rt2x00dev->ops->lib->kick_tx_queue)
+ rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
+
+ return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_tx);
+
+int rt2x00mac_start(struct ieee80211_hw *hw)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ int status;
+
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
+ test_bit(DEVICE_STARTED, &rt2x00dev->flags))
+ return 0;
+
+ /*
+ * If this is the first interface which is added,
+ * we should load the firmware now.
+ */
+ if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
+ status = rt2x00lib_load_firmware(rt2x00dev);
+ if (status)
+ return status;
+ }
+
+ /*
+ * Initialize the device.
+ */
+ status = rt2x00lib_initialize(rt2x00dev);
+ if (status)
+ return status;
+
+ /*
+ * Enable radio.
+ */
+ status = rt2x00lib_enable_radio(rt2x00dev);
+ if (status) {
+ rt2x00lib_uninitialize(rt2x00dev);
+ return status;
+ }
+
+ __set_bit(DEVICE_STARTED, &rt2x00dev->flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_start);
+
+void rt2x00mac_stop(struct ieee80211_hw *hw)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
+ return;
+
+ /*
+ * Perhaps we can add something smarter here,
+ * but for now just disabling the radio should do.
+ */
+ rt2x00lib_disable_radio(rt2x00dev);
+
+ __clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_stop);
+
+int rt2x00mac_add_interface(struct ieee80211_hw *hw,
+ struct ieee80211_if_init_conf *conf)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ struct interface *intf = &rt2x00dev->interface;
+
+ /*
+ * Don't allow interfaces to be added while
+ * either the device has disappeared or when
+ * another interface is already present.
+ */
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
+ is_interface_present(intf))
+ return -ENOBUFS;
+
+ intf->id = conf->if_id;
+ intf->type = conf->type;
+ if (conf->type == IEEE80211_IF_TYPE_AP)
+ memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
+ memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
+
+ /*
+ * The MAC adddress must be configured after the device
+ * has been initialized. Otherwise the device can reset
+ * the MAC registers.
+ */
+ rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
+ rt2x00lib_config_type(rt2x00dev, conf->type);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
+
+void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
+ struct ieee80211_if_init_conf *conf)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ struct interface *intf = &rt2x00dev->interface;
+
+ /*
+ * Don't allow interfaces to be remove while
+ * either the device has disappeared or when
+ * no interface is present.
+ */
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
+ !is_interface_present(intf))
+ return;
+
+ intf->id = 0;
+ intf->type = INVALID_INTERFACE;
+ memset(&intf->bssid, 0x00, ETH_ALEN);
+ memset(&intf->mac, 0x00, ETH_ALEN);
+
+ /*
+ * Make sure the bssid and mac address registers
+ * are cleared to prevent false ACKing of frames.
+ */
+ rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
+ rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
+ rt2x00lib_config_type(rt2x00dev, intf->type);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
+
+int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+
+ /*
+ * Mac80211 might be calling this function while we are trying
+ * to remove the device or perhaps suspending it.
+ */
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
+ return 0;
+
+ /*
+ * Check if we need to disable the radio,
+ * if this is not the case, at least the RX must be disabled.
+ */
+ if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
+ if (!conf->radio_enabled)
+ rt2x00lib_disable_radio(rt2x00dev);
+ else
+ rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
+ }
+
+ rt2x00lib_config(rt2x00dev, conf, 0);
+
+ /*
+ * Reenable RX only if the radio should be on.
+ */
+ if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
+ rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
+ else if (conf->radio_enabled)
+ return rt2x00lib_enable_radio(rt2x00dev);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_config);
+
+int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
+ struct ieee80211_if_conf *conf)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ struct interface *intf = &rt2x00dev->interface;
+ int status;
+
+ /*
+ * Mac80211 might be calling this function while we are trying
+ * to remove the device or perhaps suspending it.
+ */
+ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
+ return 0;
+
+ /*
+ * If the given type does not match the configured type,
+ * there has been a problem.
+ */
+ if (conf->type != intf->type)
+ return -EINVAL;
+
+ /*
+ * If the interface does not work in master mode,
+ * then the bssid value in the interface structure
+ * should now be set.
+ */
+ if (conf->type != IEEE80211_IF_TYPE_AP)
+ memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
+ rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
+
+ /*
+ * We only need to initialize the beacon when master mode is enabled.
+ */
+ if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
+ return 0;
+
+ status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
+ conf->beacon,
+ conf->beacon_control);
+ if (status)
+ dev_kfree_skb(conf->beacon);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
+
+int rt2x00mac_get_stats(struct ieee80211_hw *hw,
+ struct ieee80211_low_level_stats *stats)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+
+ /*
+ * The dot11ACKFailureCount, dot11RTSFailureCount and
+ * dot11RTSSuccessCount are updated in interrupt time.
+ * dot11FCSErrorCount is updated in the link tuner.
+ */
+ memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
+
+int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
+ struct ieee80211_tx_queue_stats *stats)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ unsigned int i;
+
+ for (i = 0; i < hw->queues; i++)
+ memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
+ sizeof(rt2x00dev->tx[i].stats));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
+
+void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
+ int cts_protection, int preamble)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ int short_preamble;
+ int ack_timeout;
+ int ack_consume_time;
+ int difs;
+
+ /*
+ * We only support changing preamble mode.
+ */
+ if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
+ return;
+
+ short_preamble = !preamble;
+ preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;
+
+ difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
+ SHORT_DIFS : DIFS;
+ ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);
+
+ ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);
+
+ if (short_preamble)
+ __set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
+ else
+ __clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
+
+ rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
+ ack_timeout, ack_consume_time);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);
+
+int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
+ const struct ieee80211_tx_queue_params *params)
+{
+ struct rt2x00_dev *rt2x00dev = hw->priv;
+ struct data_ring *ring;
+
+ ring = rt2x00lib_get_ring(rt2x00dev, queue);
+ if (unlikely(!ring))
+ return -EINVAL;
+
+ /*
+ * The passed variables are stored as real value ((2^n)-1).
+ * Ralink registers require to know the bit number 'n'.
+ */
+ if (params->cw_min)
+ ring->tx_params.cw_min = fls(params->cw_min);
+ else
+ ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
+
+ if (params->cw_max)
+ ring->tx_params.cw_max = fls(params->cw_max);
+ else
+ ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
+
+ if (params->aifs)
+ ring->tx_params.aifs = params->aifs;
+ else
+ ring->tx_params.aifs = 2;
+
+ INFO(rt2x00dev,
+ "Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
+ queue, ring->tx_params.cw_min, ring->tx_params.cw_max,
+ ring->tx_params.aifs);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);