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path: root/drivers/net/wireless/rt2x00/rt2x00queue.c
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Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00queue.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
new file mode 100644
index 0000000..659e9f4
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -0,0 +1,304 @@
+/*
+ Copyright (C) 2004 - 2008 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: rt2x00lib
+ Abstract: rt2x00 queue specific routines.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "rt2x00.h"
+#include "rt2x00lib.h"
+
+struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
+ const unsigned int queue)
+{
+ int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
+
+ if (queue < rt2x00dev->hw->queues && rt2x00dev->tx)
+ return &rt2x00dev->tx[queue];
+
+ if (!rt2x00dev->bcn)
+ return NULL;
+
+ if (queue == RT2X00_BCN_QUEUE_BEACON)
+ return &rt2x00dev->bcn[0];
+ else if (queue == RT2X00_BCN_QUEUE_ATIM && atim)
+ return &rt2x00dev->bcn[1];
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(rt2x00queue_get_queue);
+
+struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
+ enum queue_index index)
+{
+ struct queue_entry *entry;
+ unsigned long irqflags;
+
+ if (unlikely(index >= Q_INDEX_MAX)) {
+ ERROR(queue->rt2x00dev,
+ "Entry requested from invalid index type (%d)\n", index);
+ return NULL;
+ }
+
+ spin_lock_irqsave(&queue->lock, irqflags);
+
+ entry = &queue->entries[queue->index[index]];
+
+ spin_unlock_irqrestore(&queue->lock, irqflags);
+
+ return entry;
+}
+EXPORT_SYMBOL_GPL(rt2x00queue_get_entry);
+
+void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index)
+{
+ unsigned long irqflags;
+
+ if (unlikely(index >= Q_INDEX_MAX)) {
+ ERROR(queue->rt2x00dev,
+ "Index change on invalid index type (%d)\n", index);
+ return;
+ }
+
+ spin_lock_irqsave(&queue->lock, irqflags);
+
+ queue->index[index]++;
+ if (queue->index[index] >= queue->limit)
+ queue->index[index] = 0;
+
+ if (index == Q_INDEX) {
+ queue->length++;
+ } else if (index == Q_INDEX_DONE) {
+ queue->length--;
+ queue->count ++;
+ }
+
+ spin_unlock_irqrestore(&queue->lock, irqflags);
+}
+EXPORT_SYMBOL_GPL(rt2x00queue_index_inc);
+
+static void rt2x00queue_reset(struct data_queue *queue)
+{
+ unsigned long irqflags;
+
+ spin_lock_irqsave(&queue->lock, irqflags);
+
+ queue->count = 0;
+ queue->length = 0;
+ memset(queue->index, 0, sizeof(queue->index));
+
+ spin_unlock_irqrestore(&queue->lock, irqflags);
+}
+
+void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue = rt2x00dev->rx;
+ unsigned int i;
+
+ rt2x00queue_reset(queue);
+
+ if (!rt2x00dev->ops->lib->init_rxentry)
+ return;
+
+ for (i = 0; i < queue->limit; i++)
+ rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
+ &queue->entries[i]);
+}
+
+void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue;
+ unsigned int i;
+
+ txall_queue_for_each(rt2x00dev, queue) {
+ rt2x00queue_reset(queue);
+
+ if (!rt2x00dev->ops->lib->init_txentry)
+ continue;
+
+ for (i = 0; i < queue->limit; i++)
+ rt2x00dev->ops->lib->init_txentry(rt2x00dev,
+ &queue->entries[i]);
+ }
+}
+
+static int rt2x00queue_alloc_entries(struct data_queue *queue,
+ const struct data_queue_desc *qdesc)
+{
+ struct queue_entry *entries;
+ unsigned int entry_size;
+ unsigned int i;
+
+ rt2x00queue_reset(queue);
+
+ queue->limit = qdesc->entry_num;
+ queue->data_size = qdesc->data_size;
+ queue->desc_size = qdesc->desc_size;
+
+ /*
+ * Allocate all queue entries.
+ */
+ entry_size = sizeof(*entries) + qdesc->priv_size;
+ entries = kzalloc(queue->limit * entry_size, GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+#define QUEUE_ENTRY_PRIV_OFFSET(__base, __index, __limit, __esize, __psize) \
+ ( ((char *)(__base)) + ((__limit) * (__esize)) + \
+ ((__index) * (__psize)) )
+
+ for (i = 0; i < queue->limit; i++) {
+ entries[i].flags = 0;
+ entries[i].queue = queue;
+ entries[i].skb = NULL;
+ entries[i].entry_idx = i;
+ entries[i].priv_data =
+ QUEUE_ENTRY_PRIV_OFFSET(entries, i, queue->limit,
+ sizeof(*entries), qdesc->priv_size);
+ }
+
+#undef QUEUE_ENTRY_PRIV_OFFSET
+
+ queue->entries = entries;
+
+ return 0;
+}
+
+int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue;
+ int status;
+
+
+ status = rt2x00queue_alloc_entries(rt2x00dev->rx, rt2x00dev->ops->rx);
+ if (status)
+ goto exit;
+
+ tx_queue_for_each(rt2x00dev, queue) {
+ status = rt2x00queue_alloc_entries(queue, rt2x00dev->ops->tx);
+ if (status)
+ goto exit;
+ }
+
+ status = rt2x00queue_alloc_entries(rt2x00dev->bcn, rt2x00dev->ops->bcn);
+ if (status)
+ goto exit;
+
+ if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
+ return 0;
+
+ status = rt2x00queue_alloc_entries(&rt2x00dev->bcn[1],
+ rt2x00dev->ops->atim);
+ if (status)
+ goto exit;
+
+ return 0;
+
+exit:
+ ERROR(rt2x00dev, "Queue entries allocation failed.\n");
+
+ rt2x00queue_uninitialize(rt2x00dev);
+
+ return status;
+}
+
+void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue;
+
+ queue_for_each(rt2x00dev, queue) {
+ kfree(queue->entries);
+ queue->entries = NULL;
+ }
+}
+
+static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
+ struct data_queue *queue, enum data_queue_qid qid)
+{
+ spin_lock_init(&queue->lock);
+
+ queue->rt2x00dev = rt2x00dev;
+ queue->qid = qid;
+ queue->aifs = 2;
+ queue->cw_min = 5;
+ queue->cw_max = 10;
+}
+
+int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue;
+ enum data_queue_qid qid;
+ unsigned int req_atim =
+ !!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
+
+ /*
+ * We need the following queues:
+ * RX: 1
+ * TX: hw->queues
+ * Beacon: 1
+ * Atim: 1 (if required)
+ */
+ rt2x00dev->data_queues = 2 + rt2x00dev->hw->queues + req_atim;
+
+ queue = kzalloc(rt2x00dev->data_queues * sizeof(*queue), GFP_KERNEL);
+ if (!queue) {
+ ERROR(rt2x00dev, "Queue allocation failed.\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Initialize pointers
+ */
+ rt2x00dev->rx = queue;
+ rt2x00dev->tx = &queue[1];
+ rt2x00dev->bcn = &queue[1 + rt2x00dev->hw->queues];
+
+ /*
+ * Initialize queue parameters.
+ * RX: qid = QID_RX
+ * TX: qid = QID_AC_BE + index
+ * TX: cw_min: 2^5 = 32.
+ * TX: cw_max: 2^10 = 1024.
+ * BCN & Atim: qid = QID_MGMT
+ */
+ rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX);
+
+ qid = QID_AC_BE;
+ tx_queue_for_each(rt2x00dev, queue)
+ rt2x00queue_init(rt2x00dev, queue, qid++);
+
+ rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[0], QID_MGMT);
+ if (req_atim)
+ rt2x00queue_init(rt2x00dev, &rt2x00dev->bcn[1], QID_MGMT);
+
+ return 0;
+}
+
+void rt2x00queue_free(struct rt2x00_dev *rt2x00dev)
+{
+ kfree(rt2x00dev->rx);
+ rt2x00dev->rx = NULL;
+ rt2x00dev->tx = NULL;
+ rt2x00dev->bcn = NULL;
+}
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