![Ivo van Doorn](/assets/img/avatar_default.png)
The sequence counter can be accessed in IRQ context, which means the lock protecting the counter should be irqsave. To prevent making the entire intf->lock irqsave without reason, create a new lock which only protects the sequence counter. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
566 lines
16 KiB
C
566 lines
16 KiB
C
/*
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Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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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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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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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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Module: rt2x00mac
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Abstract: rt2x00 generic mac80211 routines.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "rt2x00.h"
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#include "rt2x00lib.h"
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static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
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struct data_queue *queue,
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struct sk_buff *frag_skb)
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{
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
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struct ieee80211_tx_info *rts_info;
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struct sk_buff *skb;
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int size;
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if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
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size = sizeof(struct ieee80211_cts);
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else
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size = sizeof(struct ieee80211_rts);
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skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
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if (!skb) {
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WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
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return NETDEV_TX_BUSY;
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}
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skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
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skb_put(skb, size);
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/*
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* Copy TX information over from original frame to
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* RTS/CTS frame. Note that we set the no encryption flag
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* since we don't want this frame to be encrypted.
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* RTS frames should be acked, while CTS-to-self frames
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* should not. The ready for TX flag is cleared to prevent
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* it being automatically send when the descriptor is
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* written to the hardware.
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*/
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memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
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rts_info = IEEE80211_SKB_CB(skb);
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rts_info->control.hw_key = NULL;
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rts_info->flags &= ~IEEE80211_TX_CTL_USE_RTS_CTS;
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rts_info->flags &= ~IEEE80211_TX_CTL_USE_CTS_PROTECT;
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rts_info->flags &= ~IEEE80211_TX_CTL_REQ_TX_STATUS;
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if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
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rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
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else
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rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
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if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
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ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
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frag_skb->data, size, tx_info,
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(struct ieee80211_cts *)(skb->data));
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else
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ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
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frag_skb->data, size, tx_info,
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(struct ieee80211_rts *)(skb->data));
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if (rt2x00queue_write_tx_frame(queue, skb)) {
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dev_kfree_skb_any(skb);
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WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
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return NETDEV_TX_BUSY;
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}
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return NETDEV_TX_OK;
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}
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int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
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struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
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enum data_queue_qid qid = skb_get_queue_mapping(skb);
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struct data_queue *queue;
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u16 frame_control;
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/*
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* Mac80211 might be calling this function while we are trying
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* to remove the device or perhaps suspending it.
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* Note that we can only stop the TX queues inside the TX path
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* due to possible race conditions in mac80211.
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*/
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
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ieee80211_stop_queues(hw);
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dev_kfree_skb_any(skb);
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return NETDEV_TX_OK;
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}
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/*
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* Determine which queue to put packet on.
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*/
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if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
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test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
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queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
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else
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queue = rt2x00queue_get_queue(rt2x00dev, qid);
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if (unlikely(!queue)) {
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ERROR(rt2x00dev,
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"Attempt to send packet over invalid queue %d.\n"
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"Please file bug report to %s.\n", qid, DRV_PROJECT);
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dev_kfree_skb_any(skb);
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return NETDEV_TX_OK;
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}
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/*
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* If CTS/RTS is required. create and queue that frame first.
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* Make sure we have at least enough entries available to send
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* this CTS/RTS frame as well as the data frame.
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* Note that when the driver has set the set_rts_threshold()
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* callback function it doesn't need software generation of
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* either RTS or CTS-to-self frame and handles everything
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* inside the hardware.
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*/
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frame_control = le16_to_cpu(ieee80211hdr->frame_control);
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if ((tx_info->flags & (IEEE80211_TX_CTL_USE_RTS_CTS |
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IEEE80211_TX_CTL_USE_CTS_PROTECT)) &&
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!rt2x00dev->ops->hw->set_rts_threshold) {
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if (rt2x00queue_available(queue) <= 1) {
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ieee80211_stop_queue(rt2x00dev->hw, qid);
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return NETDEV_TX_BUSY;
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}
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if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb)) {
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ieee80211_stop_queue(rt2x00dev->hw, qid);
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return NETDEV_TX_BUSY;
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}
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}
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if (rt2x00queue_write_tx_frame(queue, skb)) {
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ieee80211_stop_queue(rt2x00dev->hw, qid);
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return NETDEV_TX_BUSY;
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}
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if (rt2x00queue_threshold(queue))
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ieee80211_stop_queue(rt2x00dev->hw, qid);
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return NETDEV_TX_OK;
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_tx);
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int rt2x00mac_start(struct ieee80211_hw *hw)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
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return 0;
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return rt2x00lib_start(rt2x00dev);
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_start);
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void rt2x00mac_stop(struct ieee80211_hw *hw)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
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return;
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rt2x00lib_stop(rt2x00dev);
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_stop);
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int rt2x00mac_add_interface(struct ieee80211_hw *hw,
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struct ieee80211_if_init_conf *conf)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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struct rt2x00_intf *intf = vif_to_intf(conf->vif);
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struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
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struct queue_entry *entry = NULL;
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unsigned int i;
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/*
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* Don't allow interfaces to be added
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* the device has disappeared.
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*/
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
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!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
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return -ENODEV;
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/*
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* We don't support mixed combinations of sta and ap virtual
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* interfaces. We can only add this interface when the rival
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* interface count is 0.
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*/
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if ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
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(conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count))
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return -ENOBUFS;
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/*
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* Check if we exceeded the maximum amount of supported interfaces.
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*/
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if ((conf->type == IEEE80211_IF_TYPE_AP &&
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rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
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(conf->type != IEEE80211_IF_TYPE_AP &&
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rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
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return -ENOBUFS;
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/*
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* Loop through all beacon queues to find a free
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* entry. Since there are as much beacon entries
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* as the maximum interfaces, this search shouldn't
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* fail.
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*/
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for (i = 0; i < queue->limit; i++) {
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entry = &queue->entries[i];
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if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
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break;
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}
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if (unlikely(i == queue->limit))
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return -ENOBUFS;
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/*
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* We are now absolutely sure the interface can be created,
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* increase interface count and start initialization.
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*/
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if (conf->type == IEEE80211_IF_TYPE_AP)
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rt2x00dev->intf_ap_count++;
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else
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rt2x00dev->intf_sta_count++;
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spin_lock_init(&intf->lock);
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spin_lock_init(&intf->seqlock);
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intf->beacon = entry;
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if (conf->type == IEEE80211_IF_TYPE_AP)
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memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
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memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
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/*
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* The MAC adddress must be configured after the device
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* has been initialized. Otherwise the device can reset
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* the MAC registers.
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*/
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rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
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/*
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* Some filters depend on the current working mode. We can force
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* an update during the next configure_filter() run by mac80211 by
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* resetting the current packet_filter state.
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*/
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rt2x00dev->packet_filter = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
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void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
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struct ieee80211_if_init_conf *conf)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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struct rt2x00_intf *intf = vif_to_intf(conf->vif);
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/*
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* Don't allow interfaces to be remove while
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* either the device has disappeared or when
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* no interface is present.
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*/
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
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(conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
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(conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
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return;
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if (conf->type == IEEE80211_IF_TYPE_AP)
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rt2x00dev->intf_ap_count--;
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else
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rt2x00dev->intf_sta_count--;
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/*
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* Release beacon entry so it is available for
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* new interfaces again.
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*/
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__clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
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/*
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* Make sure the bssid and mac address registers
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* are cleared to prevent false ACKing of frames.
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*/
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rt2x00lib_config_intf(rt2x00dev, intf,
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IEEE80211_IF_TYPE_INVALID, NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
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int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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int force_reconfig;
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/*
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* Mac80211 might be calling this function while we are trying
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* to remove the device or perhaps suspending it.
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*/
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
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return 0;
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/*
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* Check if we need to disable the radio,
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* if this is not the case, at least the RX must be disabled.
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*/
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if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
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if (!conf->radio_enabled)
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rt2x00lib_disable_radio(rt2x00dev);
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else
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rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
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}
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/*
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* When the DEVICE_DIRTY_CONFIG flag is set, the device has recently
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* been started and the configuration must be forced upon the hardware.
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* Otherwise registers will not be intialized correctly and could
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* result in non-working hardware because essential registers aren't
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* initialized.
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*/
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force_reconfig =
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__test_and_clear_bit(DEVICE_DIRTY_CONFIG, &rt2x00dev->flags);
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rt2x00lib_config(rt2x00dev, conf, force_reconfig);
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/*
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* Reenable RX only if the radio should be on.
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*/
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if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
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rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
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else if (conf->radio_enabled)
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return rt2x00lib_enable_radio(rt2x00dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_config);
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int rt2x00mac_config_interface(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct ieee80211_if_conf *conf)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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struct rt2x00_intf *intf = vif_to_intf(vif);
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int update_bssid = 0;
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int status = 0;
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/*
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* Mac80211 might be calling this function while we are trying
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* to remove the device or perhaps suspending it.
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*/
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if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
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return 0;
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spin_lock(&intf->lock);
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/*
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* conf->bssid can be NULL if coming from the internal
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* beacon update routine.
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*/
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if (conf->changed & IEEE80211_IFCC_BSSID && conf->bssid) {
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update_bssid = 1;
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memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
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}
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spin_unlock(&intf->lock);
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/*
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* Call rt2x00_config_intf() outside of the spinlock context since
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* the call will sleep for USB drivers. By using the ieee80211_if_conf
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* values as arguments we make keep access to rt2x00_intf thread safe
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* even without the lock.
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*/
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rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
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update_bssid ? conf->bssid : NULL);
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/*
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* Update the beacon.
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*/
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if (conf->changed & IEEE80211_IFCC_BEACON)
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status = rt2x00queue_update_beacon(rt2x00dev, vif);
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return status;
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
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void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
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unsigned int changed_flags,
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unsigned int *total_flags,
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int mc_count, struct dev_addr_list *mc_list)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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/*
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* Mask off any flags we are going to ignore
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* from the total_flags field.
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*/
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*total_flags &=
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FIF_ALLMULTI |
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FIF_FCSFAIL |
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FIF_PLCPFAIL |
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FIF_CONTROL |
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FIF_OTHER_BSS |
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FIF_PROMISC_IN_BSS;
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/*
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* Apply some rules to the filters:
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* - Some filters imply different filters to be set.
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* - Some things we can't filter out at all.
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* - Multicast filter seems to kill broadcast traffic so never use it.
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*/
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*total_flags |= FIF_ALLMULTI;
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if (*total_flags & FIF_OTHER_BSS ||
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*total_flags & FIF_PROMISC_IN_BSS)
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*total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
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/*
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* Check if there is any work left for us.
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*/
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if (rt2x00dev->packet_filter == *total_flags)
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return;
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rt2x00dev->packet_filter = *total_flags;
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if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
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rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
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else
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queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
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int rt2x00mac_get_stats(struct ieee80211_hw *hw,
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struct ieee80211_low_level_stats *stats)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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/*
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* The dot11ACKFailureCount, dot11RTSFailureCount and
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* dot11RTSSuccessCount are updated in interrupt time.
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* dot11FCSErrorCount is updated in the link tuner.
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*/
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memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
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int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
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struct ieee80211_tx_queue_stats *stats)
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{
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struct rt2x00_dev *rt2x00dev = hw->priv;
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unsigned int i;
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for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
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stats[i].len = rt2x00dev->tx[i].length;
|
|
stats[i].limit = rt2x00dev->tx[i].limit;
|
|
stats[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);
|
|
unsigned int delayed = 0;
|
|
|
|
/*
|
|
* 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--;
|
|
|
|
if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
|
|
rt2x00leds_led_assoc(rt2x00dev,
|
|
!!rt2x00dev->intf_associated);
|
|
else
|
|
delayed |= DELAYED_LED_ASSOC;
|
|
}
|
|
|
|
/*
|
|
* When the erp information has changed, we should perform
|
|
* additional configuration steps. For all other changes we are done.
|
|
*/
|
|
if (changes & (BSS_CHANGED_ERP_PREAMBLE | BSS_CHANGED_ERP_CTS_PROT)) {
|
|
if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
|
|
rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
|
|
else
|
|
delayed |= DELAYED_CONFIG_ERP;
|
|
}
|
|
|
|
spin_lock(&intf->lock);
|
|
memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
|
|
if (delayed) {
|
|
intf->delayed_flags |= delayed;
|
|
schedule_work(&rt2x00dev->intf_work);
|
|
}
|
|
spin_unlock(&intf->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
|
|
|
|
int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 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. */
|
|
|
|
queue->aifs = params->aifs;
|
|
|
|
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);
|