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292 lines
6.4 KiB
C
292 lines
6.4 KiB
C
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/*
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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: rt2x00lib
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Abstract: rt2x00 queue specific 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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struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
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const enum ieee80211_tx_queue queue)
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{
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int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
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if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
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return &rt2x00dev->tx[queue];
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if (!rt2x00dev->bcn)
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return NULL;
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if (queue == IEEE80211_TX_QUEUE_BEACON)
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return &rt2x00dev->bcn[0];
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else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON && atim)
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return &rt2x00dev->bcn[1];
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return NULL;
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}
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EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
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struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
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enum queue_index index)
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{
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struct queue_entry *entry;
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if (unlikely(index >= Q_INDEX_MAX)) {
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ERROR(queue->rt2x00dev,
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"Entry requested from invalid index type (%d)\n", index);
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return NULL;
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}
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spin_lock(&queue->lock);
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entry = &queue->entries[queue->index[index]];
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spin_unlock(&queue->lock);
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return entry;
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}
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EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
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void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
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{
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if (unlikely(index >= Q_INDEX_MAX)) {
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ERROR(queue->rt2x00dev,
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"Index change on invalid index type (%d)\n", index);
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return;
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}
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spin_lock(&queue->lock);
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queue->index[index]++;
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if (queue->index[index] >= queue->limit)
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queue->index[index] = 0;
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queue->length--;
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queue->count += (index == Q_INDEX_DONE);
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spin_unlock(&queue->lock);
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}
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EXPORT_SYMBOL_GPL(rt2x00queue_index_inc);
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static void rt2x00queue_reset(struct data_queue *queue)
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{
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spin_lock(&queue->lock);
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queue->count = 0;
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queue->length = 0;
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memset(queue->index, 0, sizeof(queue->index));
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spin_unlock(&queue->lock);
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}
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void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue = rt2x00dev->rx;
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unsigned int i;
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rt2x00queue_reset(queue);
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if (!rt2x00dev->ops->lib->init_rxentry)
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return;
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for (i = 0; i < queue->limit; i++)
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rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
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&queue->entries[i]);
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}
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void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue;
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unsigned int i;
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txall_queue_for_each(rt2x00dev, queue) {
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rt2x00queue_reset(queue);
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if (!rt2x00dev->ops->lib->init_txentry)
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continue;
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for (i = 0; i < queue->limit; i++)
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rt2x00dev->ops->lib->init_txentry(rt2x00dev,
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&queue->entries[i]);
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}
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}
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static int rt2x00queue_alloc_entries(struct data_queue *queue,
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const struct data_queue_desc *qdesc)
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{
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struct queue_entry *entries;
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unsigned int entry_size;
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unsigned int i;
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rt2x00queue_reset(queue);
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queue->limit = qdesc->entry_num;
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queue->data_size = qdesc->data_size;
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queue->desc_size = qdesc->desc_size;
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/*
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* Allocate all queue entries.
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*/
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entry_size = sizeof(*entries) + qdesc->priv_size;
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entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
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if (!entries)
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return -ENOMEM;
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#define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
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( (__base) + ((__limit) * (__esize)) + ((__index) * (__psize)) )
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for (i = 0; i < queue->limit; i++) {
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entries[i].flags = 0;
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entries[i].queue = queue;
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entries[i].skb = NULL;
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entries[i].entry_idx = i;
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entries[i].priv_data =
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QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
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sizeof(*entries), qdesc->priv_size);
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}
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#undef QUEUE_ENTRY_PRIV_OFFSET
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queue->entries = entries;
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return 0;
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}
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int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue;
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int status;
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status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
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if (status)
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goto exit;
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tx_queue_for_each(rt2x00dev, queue) {
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status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
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if (status)
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goto exit;
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}
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status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
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if (status)
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goto exit;
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if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
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return 0;
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status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
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rt2x00dev->ops->atim);
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if (status)
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goto exit;
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return 0;
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exit:
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ERROR(rt2x00dev, "Queue entries allocation failed.\n");
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rt2x00queue_uninitialize(rt2x00dev);
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return status;
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}
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void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue;
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queue_for_each(rt2x00dev, queue) {
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kfree(queue->entries);
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queue->entries = NULL;
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}
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}
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int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
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{
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struct data_queue *queue;
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enum data_queue_qid qid;
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unsigned int req_atim =
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!!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
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/*
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* We need the following queues:
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* RX: 1
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* TX: hw->queues
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* Beacon: 1
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* Atim: 1 (if required)
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*/
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rt2x00dev->data_queues = 2 + rt2x00dev->hw->queues + req_atim;
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queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
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if (!queue) {
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ERROR(rt2x00dev, "Queue allocation failed.\n");
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return -ENOMEM;
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}
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/*
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* Initialize pointers
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*/
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rt2x00dev->rx = queue;
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rt2x00dev->tx = &queue[1];
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rt2x00dev->bcn = &queue[1 + rt2x00dev->hw->queues];
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/*
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* Initialize queue parameters.
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* RX: qid = QID_RX
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* TX: qid = QID_AC_BE + index
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* TX: cw_min: 2^5 = 32.
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* TX: cw_max: 2^10 = 1024.
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* BCN & Atim: qid = QID_MGMT
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*/
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qid = QID_AC_BE;
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queue_for_each(rt2x00dev, queue) {
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spin_lock_init(&queue->lock);
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queue->rt2x00dev = rt2x00dev;
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queue->qid = qid++;
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queue->aifs = 2;
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queue->cw_min = 5;
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queue->cw_max = 10;
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}
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/*
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* Fix non-TX data qid's
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*/
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rt2x00dev->rx->qid = QID_RX;
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rt2x00dev->bcn[0].qid = QID_MGMT;
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if (req_atim)
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rt2x00dev->bcn[1].qid = QID_MGMT;
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return 0;
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}
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void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
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{
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kfree(rt2x00dev->rx);
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rt2x00dev->rx = NULL;
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rt2x00dev->tx = NULL;
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rt2x00dev->bcn = NULL;
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}
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