/* Copyright (C) 2004 - 2008 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_queue *queue, 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, control->vif, frag_skb->data, frag_skb->len, control, (struct ieee80211_cts *)(skb->data)); else ieee80211_rts_get(rt2x00dev->hw, control->vif, frag_skb->data, frag_skb->len, control, (struct ieee80211_rts *)(skb->data)); if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, 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_queue *queue; 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 queue to put packet on. */ queue = rt2x00queue_get_queue(rt2x00dev, control->queue); if (unlikely(!queue)) { 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 (rt2x00queue_available(queue) <= 1) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return NETDEV_TX_BUSY; } if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return NETDEV_TX_BUSY; } } if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) { ieee80211_stop_queue(rt2x00dev->hw, control->queue); return NETDEV_TX_BUSY; } if (rt2x00queue_full(queue)) 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; if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) return 0; return rt2x00lib_start(rt2x00dev); } 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; rt2x00lib_stop(rt2x00dev); } 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 rt2x00_intf *intf = vif_to_intf(conf->vif); struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON); struct queue_entry *entry = NULL; unsigned int i; /* * Don't allow interfaces to be added * the device has disappeared. */ if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) || !test_bit(DEVICE_STARTED, &rt2x00dev->flags)) return -ENODEV; /* * When we don't support mixed interfaces (a combination * of sta and ap virtual interfaces) then we can only * add this interface when the rival interface count is 0. */ if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) && ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) || (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count))) return -ENOBUFS; /* * Check if we exceeded the maximum amount of supported interfaces. */ if ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) || (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)) return -ENOBUFS; /* * Loop through all beacon queues to find a free * entry. Since there are as much beacon entries * as the maximum interfaces, this search shouldn't * fail. */ for (i = 0; i < queue->limit; i++) { entry = &queue->entries[i]; if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags)) break; } if (unlikely(i == queue->limit)) return -ENOBUFS; /* * We are now absolutely sure the interface can be created, * increase interface count and start initialization. */ if (conf->type == IEEE80211_IF_TYPE_AP) rt2x00dev->intf_ap_count++; else rt2x00dev->intf_sta_count++; spin_lock_init(&intf->lock); intf->beacon = entry; 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_intf(rt2x00dev, intf, conf->type, intf->mac, NULL); 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 rt2x00_intf *intf = vif_to_intf(conf->vif); /* * 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) || (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) || (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count)) return; if (conf->type == IEEE80211_IF_TYPE_AP) rt2x00dev->intf_ap_count--; else rt2x00dev->intf_sta_count--; /* * Release beacon entry so it is available for * new interfaces again. */ __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags); /* * Make sure the bssid and mac address registers * are cleared to prevent false ACKing of frames. */ rt2x00lib_config_intf(rt2x00dev, intf, IEEE80211_IF_TYPE_INVALID, NULL, NULL); } 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, struct ieee80211_vif *vif, struct ieee80211_if_conf *conf) { struct rt2x00_dev *rt2x00dev = hw->priv; struct rt2x00_intf *intf = vif_to_intf(vif); 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; spin_lock(&intf->lock); /* * 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); spin_unlock(&intf->lock); /* * Call rt2x00_config_intf() outside of the spinlock context since * the call will sleep for USB drivers. By using the ieee80211_if_conf * values as arguments we make keep access to rt2x00_intf thread safe * even without the lock. */ rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->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++) { stats->data[i].len = rt2x00dev->tx[i].length; stats->data[i].limit = rt2x00dev->tx[i].limit; stats->data[i].count = rt2x00dev->tx[i].count; } return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats); void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct ieee80211_bss_conf *bss_conf, u32 changes) { struct rt2x00_dev *rt2x00dev = hw->priv; struct rt2x00_intf *intf = vif_to_intf(vif); /* * When the association status has changed we must reset the link * tuner counter. This is because some drivers determine if they * should perform link tuning based on the number of seconds * while associated or not associated. */ if (changes & BSS_CHANGED_ASSOC) { rt2x00dev->link.count = 0; if (bss_conf->assoc) rt2x00dev->intf_associated++; else rt2x00dev->intf_associated--; } /* * When the preamble mode has changed, we should perform additional * configuration steps. For all other changes we are already done. */ if (changes & BSS_CHANGED_ERP_PREAMBLE) { rt2x00lib_config_preamble(rt2x00dev, intf, bss_conf->use_short_preamble); spin_lock(&intf->lock); memcpy(&intf->conf, bss_conf, sizeof(*bss_conf)); spin_unlock(&intf->lock); } } EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed); int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx, const struct ieee80211_tx_queue_params *params) { struct rt2x00_dev *rt2x00dev = hw->priv; struct data_queue *queue; queue = rt2x00queue_get_queue(rt2x00dev, queue_idx); if (unlikely(!queue)) 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 > 0) queue->cw_min = fls(params->cw_min); else queue->cw_min = 5; /* cw_min: 2^5 = 32. */ if (params->cw_max > 0) queue->cw_max = fls(params->cw_max); else queue->cw_max = 10; /* cw_min: 2^10 = 1024. */ if (params->aifs >= 0) queue->aifs = params->aifs; else queue->aifs = 2; INFO(rt2x00dev, "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n", queue_idx, queue->cw_min, queue->cw_max, queue->aifs); return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);