/*
- Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
+ Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
+ Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
struct queue_entry *entry)
{
- unsigned int frame_size;
- unsigned int reserved_size;
struct sk_buff *skb;
struct skb_frame_desc *skbdesc;
+ unsigned int frame_size;
+ unsigned int head_size = 0;
+ unsigned int tail_size = 0;
/*
* The frame size includes descriptor size, because the
* this means we need at least 3 bytes for moving the frame
* into the correct offset.
*/
- reserved_size = 4;
+ head_size = 4;
+
+ /*
+ * For IV/EIV/ICV assembly we must make sure there is
+ * at least 8 bytes bytes available in headroom for IV/EIV
+ * and 8 bytes for ICV data as tailroon.
+ */
+ if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
+ head_size += 8;
+ tail_size += 8;
+ }
/*
* Allocate skbuffer.
*/
- skb = dev_alloc_skb(frame_size + reserved_size);
+ skb = dev_alloc_skb(frame_size + head_size + tail_size);
if (!skb)
return NULL;
- skb_reserve(skb, reserved_size);
+ /*
+ * Make sure we not have a frame with the requested bytes
+ * available in the head and tail.
+ */
+ skb_reserve(skb, head_size);
skb_put(skb, frame_size);
/*
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
- skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len,
- DMA_TO_DEVICE);
+ /*
+ * If device has requested headroom, we should make sure that
+ * is also mapped to the DMA so it can be used for transfering
+ * additional descriptor information to the hardware.
+ */
+ skb_push(skb, rt2x00dev->ops->extra_tx_headroom);
+
+ skbdesc->skb_dma =
+ dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
+
+ /*
+ * Restore data pointer to original location again.
+ */
+ skb_pull(skb, rt2x00dev->ops->extra_tx_headroom);
+
skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
}
EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
}
if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
- dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
+ /*
+ * Add headroom to the skb length, it has been removed
+ * by the driver, but it was actually mapped to DMA.
+ */
+ dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma,
+ skb->len + rt2x00dev->ops->extra_tx_headroom,
DMA_TO_DEVICE);
skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
}
dev_kfree_skb_any(skb);
}
+void rt2x00queue_align_frame(struct sk_buff *skb)
+{
+ unsigned int frame_length = skb->len;
+ unsigned int align = ALIGN_SIZE(skb, 0);
+
+ if (!align)
+ return;
+
+ skb_push(skb, align);
+ memmove(skb->data, skb->data + align, frame_length);
+ skb_trim(skb, frame_length);
+}
+
+void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
+{
+ unsigned int frame_length = skb->len;
+ unsigned int align = ALIGN_SIZE(skb, header_length);
+
+ if (!align)
+ return;
+
+ skb_push(skb, align);
+ memmove(skb->data, skb->data + align, frame_length);
+ skb_trim(skb, frame_length);
+}
+
+void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
+{
+ struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
+ unsigned int frame_length = skb->len;
+ unsigned int header_align = ALIGN_SIZE(skb, 0);
+ unsigned int payload_align = ALIGN_SIZE(skb, header_length);
+ unsigned int l2pad = 4 - (payload_align - header_align);
+
+ if (header_align == payload_align) {
+ /*
+ * Both header and payload must be moved the same
+ * amount of bytes to align them properly. This means
+ * we don't use the L2 padding but just move the entire
+ * frame.
+ */
+ rt2x00queue_align_frame(skb);
+ } else if (!payload_align) {
+ /*
+ * Simple L2 padding, only the header needs to be moved,
+ * the payload is already properly aligned.
+ */
+ skb_push(skb, header_align);
+ memmove(skb->data, skb->data + header_align, frame_length);
+ skbdesc->flags |= SKBDESC_L2_PADDED;
+ } else {
+ /*
+ *
+ * Complicated L2 padding, both header and payload need
+ * to be moved. By default we only move to the start
+ * of the buffer, so our header alignment needs to be
+ * increased if there is not enough room for the header
+ * to be moved.
+ */
+ if (payload_align > header_align)
+ header_align += 4;
+
+ skb_push(skb, header_align);
+ memmove(skb->data, skb->data + header_align, header_length);
+ memmove(skb->data + header_length + l2pad,
+ skb->data + header_length + l2pad + payload_align,
+ frame_length - header_length);
+ skbdesc->flags |= SKBDESC_L2_PADDED;
+ }
+}
+
+void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
+{
+ struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
+ unsigned int l2pad = 4 - (header_length & 3);
+
+ if (!l2pad || (skbdesc->flags & SKBDESC_L2_PADDED))
+ return;
+
+ memmove(skb->data + l2pad, skb->data, header_length);
+ skb_pull(skb, l2pad);
+}
+
+static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
+ struct txentry_desc *txdesc)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
+ struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
+ unsigned long irqflags;
+
+ if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) ||
+ unlikely(!tx_info->control.vif))
+ return;
+
+ /*
+ * Hardware should insert sequence counter.
+ * FIXME: We insert a software sequence counter first for
+ * hardware that doesn't support hardware sequence counting.
+ *
+ * This is wrong because beacons are not getting sequence
+ * numbers assigned properly.
+ *
+ * A secondary problem exists for drivers that cannot toggle
+ * sequence counting per-frame, since those will override the
+ * sequence counter given by mac80211.
+ */
+ spin_lock_irqsave(&intf->seqlock, irqflags);
+
+ if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
+ intf->seqno += 0x10;
+ hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
+ hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
+
+ spin_unlock_irqrestore(&intf->seqlock, irqflags);
+
+ __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
+}
+
+static void rt2x00queue_create_tx_descriptor_plcp(struct queue_entry *entry,
+ struct txentry_desc *txdesc,
+ const struct rt2x00_rate *hwrate)
+{
+ struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
+ struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
+ unsigned int data_length;
+ unsigned int duration;
+ unsigned int residual;
+
+ /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */
+ data_length = entry->skb->len + 4;
+ data_length += rt2x00crypto_tx_overhead(rt2x00dev, entry->skb);
+
+ /*
+ * PLCP setup
+ * Length calculation depends on OFDM/CCK rate.
+ */
+ txdesc->signal = hwrate->plcp;
+ txdesc->service = 0x04;
+
+ if (hwrate->flags & DEV_RATE_OFDM) {
+ 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 (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+ txdesc->signal |= 0x08;
+ }
+}
+
static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
struct txentry_desc *txdesc)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
- struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
struct ieee80211_rate *rate =
ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
const struct rt2x00_rate *hwrate;
- unsigned int data_length;
- unsigned int duration;
- unsigned int residual;
memset(txdesc, 0, sizeof(*txdesc));
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;
+ /*
+ * Header and alignment information.
+ */
+ txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
+ txdesc->l2pad = ALIGN_SIZE(entry->skb, txdesc->header_length);
/*
* Check whether this frame is to be acked.
/*
* Determine retry information.
*/
- txdesc->retry_limit = tx_info->control.retry_limit;
- if (tx_info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
+ txdesc->retry_limit = tx_info->control.rates[0].count - 1;
+ if (txdesc->retry_limit >= rt2x00dev->long_retry)
__set_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags);
/*
* Check if more fragments are pending
*/
- if (ieee80211_has_morefrags(hdr->frame_control)) {
+ if (ieee80211_has_morefrags(hdr->frame_control) ||
+ (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES)) {
__set_bit(ENTRY_TXD_BURST, &txdesc->flags);
__set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags);
}
* 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 (tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) {
+ if ((tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) &&
+ !test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags)) {
__set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags);
txdesc->ifs = IFS_BACKOFF;
- } else {
+ } else
txdesc->ifs = IFS_SIFS;
- }
/*
- * Hardware should insert sequence counter.
- * FIXME: We insert a software sequence counter first for
- * hardware that doesn't support hardware sequence counting.
- *
- * This is wrong because beacons are not getting sequence
- * numbers assigned properly.
- *
- * A secondary problem exists for drivers that cannot toggle
- * sequence counting per-frame, since those will override the
- * sequence counter given by mac80211.
+ * Determine rate modulation.
*/
- if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
- spin_lock(&intf->lock);
-
- if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
- intf->seqno += 0x10;
- hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
- hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
-
- spin_unlock(&intf->lock);
-
- __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
- }
+ hwrate = rt2x00_get_rate(rate->hw_value);
+ txdesc->rate_mode = RATE_MODE_CCK;
+ if (hwrate->flags & DEV_RATE_OFDM)
+ txdesc->rate_mode = RATE_MODE_OFDM;
/*
- * PLCP setup
- * Length calculation depends on OFDM/CCK rate.
+ * Apply TX descriptor handling by components
*/
- 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;
- }
+ rt2x00crypto_create_tx_descriptor(entry, txdesc);
+ rt2x00ht_create_tx_descriptor(entry, txdesc, hwrate);
+ rt2x00queue_create_tx_descriptor_seq(entry, txdesc);
+ rt2x00queue_create_tx_descriptor_plcp(entry, txdesc, hwrate);
}
static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
}
-int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
+int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
+ bool local)
{
+ struct ieee80211_tx_info *tx_info;
struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
struct txentry_desc txdesc;
struct skb_frame_desc *skbdesc;
+ u8 rate_idx, rate_flags;
if (unlikely(rt2x00queue_full(queue)))
- return -EINVAL;
+ return -ENOBUFS;
- if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
+ if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
ERROR(queue->rt2x00dev,
"Arrived at non-free entry in the non-full queue %d.\n"
"Please file bug report to %s.\n",
rt2x00queue_create_tx_descriptor(entry, &txdesc);
/*
- * skb->cb array is now ours and we are free to use it.
+ * All information is retrieved from the skb->cb array,
+ * now we should claim ownership of the driver part of that
+ * array, preserving the bitrate index and flags.
*/
- skbdesc = get_skb_frame_desc(entry->skb);
+ tx_info = IEEE80211_SKB_CB(skb);
+ rate_idx = tx_info->control.rates[0].idx;
+ rate_flags = tx_info->control.rates[0].flags;
+ skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
skbdesc->entry = entry;
+ skbdesc->tx_rate_idx = rate_idx;
+ skbdesc->tx_rate_flags = rate_flags;
+
+ if (local)
+ skbdesc->flags |= SKBDESC_NOT_MAC80211;
+
+ /*
+ * When hardware encryption is supported, and this frame
+ * is to be encrypted, we should strip the IV/EIV data from
+ * the frame so we can provide it to the driver seperately.
+ */
+ if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
+ !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
+ if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
+ rt2x00crypto_tx_copy_iv(skb, &txdesc);
+ else
+ rt2x00crypto_tx_remove_iv(skb, &txdesc);
+ }
+
+ /*
+ * When DMA allocation is required we should guarentee to the
+ * driver that the DMA is aligned to a 4-byte boundary.
+ * However some drivers require L2 padding to pad the payload
+ * rather then the header. This could be a requirement for
+ * PCI and USB devices, while header alignment only is valid
+ * for PCI devices.
+ */
+ if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
+ rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
+ else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
+ rt2x00queue_align_frame(entry->skb);
+ /*
+ * It could be possible that the queue was corrupted and this
+ * call failed. Since we always return NETDEV_TX_OK to mac80211,
+ * this frame will simply be dropped.
+ */
if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
- __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
+ clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
+ entry->skb = NULL;
return -EIO;
}
if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
rt2x00queue_map_txskb(queue->rt2x00dev, skb);
- __set_bit(ENTRY_DATA_PENDING, &entry->flags);
+ set_bit(ENTRY_DATA_PENDING, &entry->flags);
rt2x00queue_index_inc(queue, Q_INDEX);
rt2x00queue_write_tx_descriptor(entry, &txdesc);
}
int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
- struct ieee80211_vif *vif)
+ struct ieee80211_vif *vif,
+ const bool enable_beacon)
{
struct rt2x00_intf *intf = vif_to_intf(vif);
struct skb_frame_desc *skbdesc;
if (unlikely(!intf->beacon))
return -ENOBUFS;
+ mutex_lock(&intf->beacon_skb_mutex);
+
+ /*
+ * Clean up the beacon skb.
+ */
+ rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
+ intf->beacon->skb = NULL;
+
+ if (!enable_beacon) {
+ rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, QID_BEACON);
+ mutex_unlock(&intf->beacon_skb_mutex);
+ return 0;
+ }
+
intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
- if (!intf->beacon->skb)
+ if (!intf->beacon->skb) {
+ mutex_unlock(&intf->beacon_skb_mutex);
return -ENOMEM;
+ }
/*
* Copy all TX descriptor information into txdesc,
rt2x00dev->ops->lib->write_beacon(intf->beacon);
rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);
+ mutex_unlock(&intf->beacon_skb_mutex);
+
return 0;
}
{
int atim = test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
+ if (queue == QID_RX)
+ return rt2x00dev->rx;
+
if (queue < rt2x00dev->ops->tx_queues && rt2x00dev->tx)
return &rt2x00dev->tx[queue];
queue->length++;
} else if (index == Q_INDEX_DONE) {
queue->length--;
- queue->count ++;
+ queue->count++;
}
spin_unlock_irqrestore(&queue->lock, irqflags);
spin_unlock_irqrestore(&queue->lock, irqflags);
}
-void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
+void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev)
{
- struct data_queue *queue = rt2x00dev->rx;
- unsigned int i;
-
- rt2x00queue_reset(queue);
-
- if (!rt2x00dev->ops->lib->init_rxentry)
- return;
+ struct data_queue *queue;
- for (i = 0; i < queue->limit; i++)
- rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
- &queue->entries[i]);
+ txall_queue_for_each(rt2x00dev, queue)
+ rt2x00dev->ops->lib->kill_tx_queue(rt2x00dev, queue->qid);
}
-void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
+void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
{
struct data_queue *queue;
unsigned int i;
- txall_queue_for_each(rt2x00dev, queue) {
+ queue_for_each(rt2x00dev, queue) {
rt2x00queue_reset(queue);
- if (!rt2x00dev->ops->lib->init_txentry)
- continue;
+ for (i = 0; i < queue->limit; i++) {
+ queue->entries[i].flags = 0;
- for (i = 0; i < queue->limit; i++)
- rt2x00dev->ops->lib->init_txentry(rt2x00dev,
- &queue->entries[i]);
+ rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
+ }
}
}
queue->rt2x00dev = rt2x00dev;
queue->qid = qid;
+ queue->txop = 0;
queue->aifs = 2;
queue->cw_min = 5;
queue->cw_max = 10;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff