/* 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" void rt2x00queue_create_tx_descriptor(struct queue_entry *entry, struct txentry_desc *txdesc, struct ieee80211_tx_control *control) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data; struct ieee80211_rate *rate = control->tx_rate; const struct rt2x00_rate *hwrate; unsigned int data_length; unsigned int duration; unsigned int residual; u16 frame_control; memset(txdesc, 0, sizeof(*txdesc)); /* * Initialize information from queue */ txdesc->queue = entry->queue->qid; txdesc->cw_min = entry->queue->cw_min; txdesc->cw_max = entry->queue->cw_max; txdesc->aifs = entry->queue->aifs; /* Data length should be extended with 4 bytes for CRC */ data_length = entry->skb->len + 4; /* * Read required fields from ieee80211 header. */ frame_control = le16_to_cpu(hdr->frame_control); /* * Check whether this frame is to be acked. */ if (!(control->flags & IEEE80211_TXCTL_NO_ACK)) __set_bit(ENTRY_TXD_ACK, &txdesc->flags); /* * Check if this is a RTS/CTS frame */ if (is_rts_frame(frame_control) || is_cts_frame(frame_control)) { __set_bit(ENTRY_TXD_BURST, &txdesc->flags); if (is_rts_frame(frame_control)) { __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags); __set_bit(ENTRY_TXD_ACK, &txdesc->flags); } else { __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags); __clear_bit(ENTRY_TXD_ACK, &txdesc->flags); } if (control->rts_cts_rate) rate = control->rts_cts_rate; } /* * Determine retry information. */ txdesc->retry_limit = control->retry_limit; if (control->flags & IEEE80211_TXCTL_LONG_RETRY_LIMIT) __set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags); /* * Check if more fragments are pending */ if (ieee80211_get_morefrag(hdr)) { __set_bit(ENTRY_TXD_BURST, &txdesc->flags); __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags); } /* * Beacons and probe responses require the tsf timestamp * to be inserted into the frame. */ if (txdesc->queue == QID_BEACON || is_probe_resp(frame_control)) __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags); /* * Determine with what IFS priority this frame should be send. * Set ifs to IFS_SIFS when the this is not the first fragment, * or this fragment came after RTS/CTS. */ if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) { txdesc->ifs = IFS_SIFS; } else if (control->flags & IEEE80211_TXCTL_FIRST_FRAGMENT) { __set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags); txdesc->ifs = IFS_BACKOFF; } else { txdesc->ifs = IFS_SIFS; } /* * PLCP setup * Length calculation depends on OFDM/CCK rate. */ hwrate = rt2x00_get_rate(rate->hw_value); txdesc->signal = hwrate->plcp; txdesc->service = 0x04; if (hwrate->flags & DEV_RATE_OFDM) { __set_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags); txdesc->length_high = (data_length >> 6) & 0x3f; txdesc->length_low = data_length & 0x3f; } else { /* * Convert length to microseconds. */ residual = get_duration_res(data_length, hwrate->bitrate); duration = get_duration(data_length, hwrate->bitrate); if (residual != 0) { duration++; /* * Check if we need to set the Length Extension */ if (hwrate->bitrate == 110 && residual <= 30) txdesc->service |= 0x80; } txdesc->length_high = (duration >> 8) & 0xff; txdesc->length_low = duration & 0xff; /* * When preamble is enabled we should set the * preamble bit for the signal. */ if (rt2x00_get_rate_preamble(rate->hw_value)) txdesc->signal |= 0x08; } } EXPORT_SYMBOL_GPL(rt2x00queue_create_tx_descriptor); void rt2x00queue_write_tx_descriptor(struct queue_entry *entry, struct txentry_desc *txdesc) { struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc); /* * All processing on the frame has been completed, this means * it is now ready to be dumped to userspace through debugfs. */ rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb); /* * We are done writing the frame to the queue entry, * if this entry is a RTS of CTS-to-self frame we are done, * otherwise we need to kick the queue. */ if (rt2x00dev->ops->lib->kick_tx_queue && !(skbdesc->flags & FRAME_DESC_DRIVER_GENERATED)) rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, entry->queue->qid); } EXPORT_SYMBOL_GPL(rt2x00queue_write_tx_descriptor); struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev, const enum data_queue_qid queue) { int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags); if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx) return &rt2x00dev->tx[queue]; if (!rt2x00dev->bcn) return NULL; if (queue == QID_BEACON) return &rt2x00dev->bcn[0]; else if (queue == QID_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: ops->tx_queues * Beacon: 1 * Atim: 1 (if required) */ rt2x00dev->data_queues = 2 + rt2x00dev->ops->tx_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->ops->tx_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; }