/* Copyright (C) 2004 - 2007 rt2x00 SourceForge Project 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. */ #include #include #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 NETDEV_TX_OK; } /* * 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) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return NETDEV_TX_BUSY; } if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control)) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return NETDEV_TX_BUSY; } } if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return NETDEV_TX_BUSY; } if (rt2x00_ring_full(ring)) ieee80211_stop_queue(rt2x00dev->hw, control->queue); 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; /* FIXME: Beaconing is broken in rt2x00. */ if (conf->type == IEEE80211_IF_TYPE_IBSS || conf->type == IEEE80211_IF_TYPE_AP) { ERROR(rt2x00dev, "rt2x00 does not support Adhoc or Master mode"); return -EOPNOTSUPP; } /* * 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 = IEEE80211_IF_TYPE_INVALID; 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);