diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00queue.c | 1290 |
1 files changed, 0 insertions, 1290 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c deleted file mode 100644 index 68b620b2462f..000000000000 --- a/drivers/net/wireless/rt2x00/rt2x00queue.c +++ /dev/null @@ -1,1290 +0,0 @@ -/* - Copyright (C) 2010 Willow Garage <http://www.willowgarage.com> - Copyright (C) 2004 - 2010 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 - 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, see <http://www.gnu.org/licenses/>. - */ - -/* - Module: rt2x00lib - Abstract: rt2x00 queue specific routines. - */ - -#include <linux/slab.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/dma-mapping.h> - -#include "rt2x00.h" -#include "rt2x00lib.h" - -struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry, gfp_t gfp) -{ - struct data_queue *queue = entry->queue; - struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; - 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 - * hardware directly receive the frame into the skbuffer. - */ - frame_size = queue->data_size + queue->desc_size + queue->winfo_size; - - /* - * The payload should be aligned to a 4-byte boundary, - * this means we need at least 3 bytes for moving the frame - * into the correct offset. - */ - 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 (rt2x00_has_cap_hw_crypto(rt2x00dev)) { - head_size += 8; - tail_size += 8; - } - - /* - * Allocate skbuffer. - */ - skb = __dev_alloc_skb(frame_size + head_size + tail_size, gfp); - if (!skb) - return NULL; - - /* - * 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); - - /* - * Populate skbdesc. - */ - skbdesc = get_skb_frame_desc(skb); - memset(skbdesc, 0, sizeof(*skbdesc)); - skbdesc->entry = entry; - - if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA)) { - dma_addr_t skb_dma; - - skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len, - DMA_FROM_DEVICE); - if (unlikely(dma_mapping_error(rt2x00dev->dev, skb_dma))) { - dev_kfree_skb_any(skb); - return NULL; - } - - skbdesc->skb_dma = skb_dma; - skbdesc->flags |= SKBDESC_DMA_MAPPED_RX; - } - - return skb; -} - -int rt2x00queue_map_txskb(struct queue_entry *entry) -{ - struct device *dev = entry->queue->rt2x00dev->dev; - struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); - - skbdesc->skb_dma = - dma_map_single(dev, entry->skb->data, entry->skb->len, DMA_TO_DEVICE); - - if (unlikely(dma_mapping_error(dev, skbdesc->skb_dma))) - return -ENOMEM; - - skbdesc->flags |= SKBDESC_DMA_MAPPED_TX; - return 0; -} -EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb); - -void rt2x00queue_unmap_skb(struct queue_entry *entry) -{ - struct device *dev = entry->queue->rt2x00dev->dev; - struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); - - if (skbdesc->flags & SKBDESC_DMA_MAPPED_RX) { - dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len, - DMA_FROM_DEVICE); - skbdesc->flags &= ~SKBDESC_DMA_MAPPED_RX; - } else if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) { - dma_unmap_single(dev, skbdesc->skb_dma, entry->skb->len, - DMA_TO_DEVICE); - skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX; - } -} -EXPORT_SYMBOL_GPL(rt2x00queue_unmap_skb); - -void rt2x00queue_free_skb(struct queue_entry *entry) -{ - if (!entry->skb) - return; - - rt2x00queue_unmap_skb(entry); - dev_kfree_skb_any(entry->skb); - entry->skb = NULL; -} - -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); -} - -/* - * H/W needs L2 padding between the header and the paylod if header size - * is not 4 bytes aligned. - */ -void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int hdr_len) -{ - unsigned int l2pad = (skb->len > hdr_len) ? L2PAD_SIZE(hdr_len) : 0; - - if (!l2pad) - return; - - skb_push(skb, l2pad); - memmove(skb->data, skb->data + l2pad, hdr_len); -} - -void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int hdr_len) -{ - unsigned int l2pad = (skb->len > hdr_len) ? L2PAD_SIZE(hdr_len) : 0; - - if (!l2pad) - return; - - memmove(skb->data + l2pad, skb->data, hdr_len); - skb_pull(skb, l2pad); -} - -static void rt2x00queue_create_tx_descriptor_seq(struct rt2x00_dev *rt2x00dev, - struct sk_buff *skb, - struct txentry_desc *txdesc) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; - struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif); - u16 seqno; - - if (!(tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)) - return; - - __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags); - - if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_SW_SEQNO)) { - /* - * rt2800 has a H/W (or F/W) bug, device incorrectly increase - * seqno on retransmited data (non-QOS) frames. To workaround - * the problem let's generate seqno in software if QOS is - * disabled. - */ - if (test_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags)) - __clear_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags); - else - /* H/W will generate sequence number */ - return; - } - - /* - * The hardware is not able to insert a sequence number. Assign a - * software generated one here. - * - * 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. - */ - if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags)) - seqno = atomic_add_return(0x10, &intf->seqno); - else - seqno = atomic_read(&intf->seqno); - - hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG); - hdr->seq_ctrl |= cpu_to_le16(seqno); -} - -static void rt2x00queue_create_tx_descriptor_plcp(struct rt2x00_dev *rt2x00dev, - struct sk_buff *skb, - struct txentry_desc *txdesc, - const struct rt2x00_rate *hwrate) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0]; - unsigned int data_length; - unsigned int duration; - unsigned int residual; - - /* - * 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_FIRST_FRAGMENT, &txdesc->flags)) - txdesc->u.plcp.ifs = IFS_BACKOFF; - else - txdesc->u.plcp.ifs = IFS_SIFS; - - /* Data length + CRC + Crypto overhead (IV/EIV/ICV/MIC) */ - data_length = skb->len + 4; - data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb); - - /* - * PLCP setup - * Length calculation depends on OFDM/CCK rate. - */ - txdesc->u.plcp.signal = hwrate->plcp; - txdesc->u.plcp.service = 0x04; - - if (hwrate->flags & DEV_RATE_OFDM) { - txdesc->u.plcp.length_high = (data_length >> 6) & 0x3f; - txdesc->u.plcp.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->u.plcp.service |= 0x80; - } - - txdesc->u.plcp.length_high = (duration >> 8) & 0xff; - txdesc->u.plcp.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->u.plcp.signal |= 0x08; - } -} - -static void rt2x00queue_create_tx_descriptor_ht(struct rt2x00_dev *rt2x00dev, - struct sk_buff *skb, - struct txentry_desc *txdesc, - struct ieee80211_sta *sta, - const struct rt2x00_rate *hwrate) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0]; - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; - struct rt2x00_sta *sta_priv = NULL; - - if (sta) { - txdesc->u.ht.mpdu_density = - sta->ht_cap.ampdu_density; - - sta_priv = sta_to_rt2x00_sta(sta); - txdesc->u.ht.wcid = sta_priv->wcid; - } - - /* - * If IEEE80211_TX_RC_MCS is set txrate->idx just contains the - * mcs rate to be used - */ - if (txrate->flags & IEEE80211_TX_RC_MCS) { - txdesc->u.ht.mcs = txrate->idx; - - /* - * MIMO PS should be set to 1 for STA's using dynamic SM PS - * when using more then one tx stream (>MCS7). - */ - if (sta && txdesc->u.ht.mcs > 7 && - sta->smps_mode == IEEE80211_SMPS_DYNAMIC) - __set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags); - } else { - txdesc->u.ht.mcs = rt2x00_get_rate_mcs(hwrate->mcs); - if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) - txdesc->u.ht.mcs |= 0x08; - } - - if (test_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags)) { - if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)) - txdesc->u.ht.txop = TXOP_SIFS; - else - txdesc->u.ht.txop = TXOP_BACKOFF; - - /* Left zero on all other settings. */ - return; - } - - txdesc->u.ht.ba_size = 7; /* FIXME: What value is needed? */ - - /* - * Only one STBC stream is supported for now. - */ - if (tx_info->flags & IEEE80211_TX_CTL_STBC) - txdesc->u.ht.stbc = 1; - - /* - * This frame is eligible for an AMPDU, however, don't aggregate - * frames that are intended to probe a specific tx rate. - */ - if (tx_info->flags & IEEE80211_TX_CTL_AMPDU && - !(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)) - __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags); - - /* - * Set 40Mhz mode if necessary (for legacy rates this will - * duplicate the frame to both channels). - */ - if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH || - txrate->flags & IEEE80211_TX_RC_DUP_DATA) - __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags); - if (txrate->flags & IEEE80211_TX_RC_SHORT_GI) - __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags); - - /* - * Determine IFS values - * - Use TXOP_BACKOFF for management frames except beacons - * - Use TXOP_SIFS for fragment bursts - * - Use TXOP_HTTXOP for everything else - * - * Note: rt2800 devices won't use CTS protection (if used) - * for frames not transmitted with TXOP_HTTXOP - */ - if (ieee80211_is_mgmt(hdr->frame_control) && - !ieee80211_is_beacon(hdr->frame_control)) - txdesc->u.ht.txop = TXOP_BACKOFF; - else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)) - txdesc->u.ht.txop = TXOP_SIFS; - else - txdesc->u.ht.txop = TXOP_HTTXOP; -} - -static void rt2x00queue_create_tx_descriptor(struct rt2x00_dev *rt2x00dev, - struct sk_buff *skb, - struct txentry_desc *txdesc, - struct ieee80211_sta *sta) -{ - struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; - struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0]; - struct ieee80211_rate *rate; - const struct rt2x00_rate *hwrate = NULL; - - memset(txdesc, 0, sizeof(*txdesc)); - - /* - * Header and frame information. - */ - txdesc->length = skb->len; - txdesc->header_length = ieee80211_get_hdrlen_from_skb(skb); - - /* - * Check whether this frame is to be acked. - */ - if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) - __set_bit(ENTRY_TXD_ACK, &txdesc->flags); - - /* - * Check if this is a RTS/CTS frame - */ - if (ieee80211_is_rts(hdr->frame_control) || - ieee80211_is_cts(hdr->frame_control)) { - __set_bit(ENTRY_TXD_BURST, &txdesc->flags); - if (ieee80211_is_rts(hdr->frame_control)) - __set_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags); - else - __set_bit(ENTRY_TXD_CTS_FRAME, &txdesc->flags); - if (tx_info->control.rts_cts_rate_idx >= 0) - rate = - ieee80211_get_rts_cts_rate(rt2x00dev->hw, tx_info); - } - - /* - * Determine retry information. - */ - 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)) { - __set_bit(ENTRY_TXD_BURST, &txdesc->flags); - __set_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags); - } - - /* - * Check if more frames (!= fragments) are pending - */ - if (tx_info->flags & IEEE80211_TX_CTL_MORE_FRAMES) - __set_bit(ENTRY_TXD_BURST, &txdesc->flags); - - /* - * Beacons and probe responses require the tsf timestamp - * to be inserted into the frame. - */ - if (ieee80211_is_beacon(hdr->frame_control) || - ieee80211_is_probe_resp(hdr->frame_control)) - __set_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags); - - 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); - - /* - * Determine rate modulation. - */ - if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD) - txdesc->rate_mode = RATE_MODE_HT_GREENFIELD; - else if (txrate->flags & IEEE80211_TX_RC_MCS) - txdesc->rate_mode = RATE_MODE_HT_MIX; - else { - rate = ieee80211_get_tx_rate(rt2x00dev->hw, tx_info); - hwrate = rt2x00_get_rate(rate->hw_value); - if (hwrate->flags & DEV_RATE_OFDM) - txdesc->rate_mode = RATE_MODE_OFDM; - else - txdesc->rate_mode = RATE_MODE_CCK; - } - - /* - * Apply TX descriptor handling by components - */ - rt2x00crypto_create_tx_descriptor(rt2x00dev, skb, txdesc); - rt2x00queue_create_tx_descriptor_seq(rt2x00dev, skb, txdesc); - - if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_HT_TX_DESC)) - rt2x00queue_create_tx_descriptor_ht(rt2x00dev, skb, txdesc, - sta, hwrate); - else - rt2x00queue_create_tx_descriptor_plcp(rt2x00dev, skb, txdesc, - hwrate); -} - -static int rt2x00queue_write_tx_data(struct queue_entry *entry, - struct txentry_desc *txdesc) -{ - struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; - - /* - * This should not happen, we already checked the entry - * was ours. When the hardware disagrees there has been - * a queue corruption! - */ - if (unlikely(rt2x00dev->ops->lib->get_entry_state && - rt2x00dev->ops->lib->get_entry_state(entry))) { - rt2x00_err(rt2x00dev, - "Corrupt queue %d, accessing entry which is not ours\n" - "Please file bug report to %s\n", - entry->queue->qid, DRV_PROJECT); - return -EINVAL; - } - - /* - * Add the requested extra tx headroom in front of the skb. - */ - skb_push(entry->skb, rt2x00dev->extra_tx_headroom); - memset(entry->skb->data, 0, rt2x00dev->extra_tx_headroom); - - /* - * Call the driver's write_tx_data function, if it exists. - */ - if (rt2x00dev->ops->lib->write_tx_data) - rt2x00dev->ops->lib->write_tx_data(entry, txdesc); - - /* - * Map the skb to DMA. - */ - if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA) && - rt2x00queue_map_txskb(entry)) - return -ENOMEM; - - return 0; -} - -static void rt2x00queue_write_tx_descriptor(struct queue_entry *entry, - struct txentry_desc *txdesc) -{ - struct data_queue *queue = entry->queue; - - queue->rt2x00dev->ops->lib->write_tx_desc(entry, 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(queue->rt2x00dev, DUMP_FRAME_TX, entry->skb); -} - -static void rt2x00queue_kick_tx_queue(struct data_queue *queue, - struct txentry_desc *txdesc) -{ - /* - * Check if we need to kick the queue, there are however a few rules - * 1) Don't kick unless this is the last in frame in a burst. - * When the burst flag is set, this frame is always followed - * by another frame which in some way are related to eachother. - * This is true for fragments, RTS or CTS-to-self frames. - * 2) Rule 1 can be broken when the available entries - * in the queue are less then a certain threshold. - */ - if (rt2x00queue_threshold(queue) || - !test_bit(ENTRY_TXD_BURST, &txdesc->flags)) - queue->rt2x00dev->ops->lib->kick_queue(queue); -} - -static void rt2x00queue_bar_check(struct queue_entry *entry) -{ - struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev; - struct ieee80211_bar *bar = (void *) (entry->skb->data + - rt2x00dev->extra_tx_headroom); - struct rt2x00_bar_list_entry *bar_entry; - - if (likely(!ieee80211_is_back_req(bar->frame_control))) - return; - - bar_entry = kmalloc(sizeof(*bar_entry), GFP_ATOMIC); - - /* - * If the alloc fails we still send the BAR out but just don't track - * it in our bar list. And as a result we will report it to mac80211 - * back as failed. - */ - if (!bar_entry) - return; - - bar_entry->entry = entry; - bar_entry->block_acked = 0; - - /* - * Copy the relevant parts of the 802.11 BAR into out check list - * such that we can use RCU for less-overhead in the RX path since - * sending BARs and processing the according BlockAck should be - * the exception. - */ - memcpy(bar_entry->ra, bar->ra, sizeof(bar->ra)); - memcpy(bar_entry->ta, bar->ta, sizeof(bar->ta)); - bar_entry->control = bar->control; - bar_entry->start_seq_num = bar->start_seq_num; - - /* - * Insert BAR into our BAR check list. - */ - spin_lock_bh(&rt2x00dev->bar_list_lock); - list_add_tail_rcu(&bar_entry->list, &rt2x00dev->bar_list); - spin_unlock_bh(&rt2x00dev->bar_list_lock); -} - -int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb, - struct ieee80211_sta *sta, bool local) -{ - struct ieee80211_tx_info *tx_info; - struct queue_entry *entry; - struct txentry_desc txdesc; - struct skb_frame_desc *skbdesc; - u8 rate_idx, rate_flags; - int ret = 0; - - /* - * Copy all TX descriptor information into txdesc, - * after that we are free to use the skb->cb array - * for our information. - */ - rt2x00queue_create_tx_descriptor(queue->rt2x00dev, skb, &txdesc, sta); - - /* - * 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. - */ - 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->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 separately. - */ - if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) && - !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) { - if (rt2x00_has_cap_flag(queue->rt2x00dev, REQUIRE_COPY_IV)) - rt2x00crypto_tx_copy_iv(skb, &txdesc); - else - rt2x00crypto_tx_remove_iv(skb, &txdesc); - } - - /* - * When DMA allocation is required we should guarantee 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 (rt2x00_has_cap_flag(queue->rt2x00dev, REQUIRE_L2PAD)) - rt2x00queue_insert_l2pad(skb, txdesc.header_length); - else if (rt2x00_has_cap_flag(queue->rt2x00dev, REQUIRE_DMA)) - rt2x00queue_align_frame(skb); - - /* - * That function must be called with bh disabled. - */ - spin_lock(&queue->tx_lock); - - if (unlikely(rt2x00queue_full(queue))) { - rt2x00_err(queue->rt2x00dev, "Dropping frame due to full tx queue %d\n", - queue->qid); - ret = -ENOBUFS; - goto out; - } - - entry = rt2x00queue_get_entry(queue, Q_INDEX); - - if (unlikely(test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, - &entry->flags))) { - rt2x00_err(queue->rt2x00dev, - "Arrived at non-free entry in the non-full queue %d\n" - "Please file bug report to %s\n", - queue->qid, DRV_PROJECT); - ret = -EINVAL; - goto out; - } - - skbdesc->entry = entry; - entry->skb = 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(rt2x00queue_write_tx_data(entry, &txdesc))) { - clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags); - entry->skb = NULL; - ret = -EIO; - goto out; - } - - /* - * Put BlockAckReqs into our check list for driver BA processing. - */ - rt2x00queue_bar_check(entry); - - set_bit(ENTRY_DATA_PENDING, &entry->flags); - - rt2x00queue_index_inc(entry, Q_INDEX); - rt2x00queue_write_tx_descriptor(entry, &txdesc); - rt2x00queue_kick_tx_queue(queue, &txdesc); - -out: - spin_unlock(&queue->tx_lock); - return ret; -} - -int rt2x00queue_clear_beacon(struct rt2x00_dev *rt2x00dev, - struct ieee80211_vif *vif) -{ - struct rt2x00_intf *intf = vif_to_intf(vif); - - if (unlikely(!intf->beacon)) - return -ENOBUFS; - - /* - * Clean up the beacon skb. - */ - rt2x00queue_free_skb(intf->beacon); - - /* - * Clear beacon (single bssid devices don't need to clear the beacon - * since the beacon queue will get stopped anyway). - */ - if (rt2x00dev->ops->lib->clear_beacon) - rt2x00dev->ops->lib->clear_beacon(intf->beacon); - - return 0; -} - -int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev, - struct ieee80211_vif *vif) -{ - struct rt2x00_intf *intf = vif_to_intf(vif); - struct skb_frame_desc *skbdesc; - struct txentry_desc txdesc; - - if (unlikely(!intf->beacon)) - return -ENOBUFS; - - /* - * Clean up the beacon skb. - */ - rt2x00queue_free_skb(intf->beacon); - - intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif); - if (!intf->beacon->skb) - return -ENOMEM; - - /* - * Copy all TX descriptor information into txdesc, - * after that we are free to use the skb->cb array - * for our information. - */ - rt2x00queue_create_tx_descriptor(rt2x00dev, intf->beacon->skb, &txdesc, NULL); - - /* - * Fill in skb descriptor - */ - skbdesc = get_skb_frame_desc(intf->beacon->skb); - memset(skbdesc, 0, sizeof(*skbdesc)); - skbdesc->entry = intf->beacon; - - /* - * Send beacon to hardware. - */ - rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc); - - return 0; - -} - -bool rt2x00queue_for_each_entry(struct data_queue *queue, - enum queue_index start, - enum queue_index end, - void *data, - bool (*fn)(struct queue_entry *entry, - void *data)) -{ - unsigned long irqflags; - unsigned int index_start; - unsigned int index_end; - unsigned int i; - - if (unlikely(start >= Q_INDEX_MAX || end >= Q_INDEX_MAX)) { - rt2x00_err(queue->rt2x00dev, - "Entry requested from invalid index range (%d - %d)\n", - start, end); - return true; - } - - /* - * Only protect the range we are going to loop over, - * if during our loop a extra entry is set to pending - * it should not be kicked during this run, since it - * is part of another TX operation. - */ - spin_lock_irqsave(&queue->index_lock, irqflags); - index_start = queue->index[start]; - index_end = queue->index[end]; - spin_unlock_irqrestore(&queue->index_lock, irqflags); - - /* - * Start from the TX done pointer, this guarantees that we will - * send out all frames in the correct order. - */ - if (index_start < index_end) { - for (i = index_start; i < index_end; i++) { - if (fn(&queue->entries[i], data)) - return true; - } - } else { - for (i = index_start; i < queue->limit; i++) { - if (fn(&queue->entries[i], data)) - return true; - } - - for (i = 0; i < index_end; i++) { - if (fn(&queue->entries[i], data)) - return true; - } - } - - return false; -} -EXPORT_SYMBOL_GPL(rt2x00queue_for_each_entry); - -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)) { - rt2x00_err(queue->rt2x00dev, "Entry requested from invalid index type (%d)\n", - index); - return NULL; - } - - spin_lock_irqsave(&queue->index_lock, irqflags); - - entry = &queue->entries[queue->index[index]]; - - spin_unlock_irqrestore(&queue->index_lock, irqflags); - - return entry; -} -EXPORT_SYMBOL_GPL(rt2x00queue_get_entry); - -void rt2x00queue_index_inc(struct queue_entry *entry, enum queue_index index) -{ - struct data_queue *queue = entry->queue; - unsigned long irqflags; - - if (unlikely(index >= Q_INDEX_MAX)) { - rt2x00_err(queue->rt2x00dev, - "Index change on invalid index type (%d)\n", index); - return; - } - - spin_lock_irqsave(&queue->index_lock, irqflags); - - queue->index[index]++; - if (queue->index[index] >= queue->limit) - queue->index[index] = 0; - - entry->last_action = jiffies; - - if (index == Q_INDEX) { - queue->length++; - } else if (index == Q_INDEX_DONE) { - queue->length--; - queue->count++; - } - - spin_unlock_irqrestore(&queue->index_lock, irqflags); -} - -static void rt2x00queue_pause_queue_nocheck(struct data_queue *queue) -{ - switch (queue->qid) { - case QID_AC_VO: - case QID_AC_VI: - case QID_AC_BE: - case QID_AC_BK: - /* - * For TX queues, we have to disable the queue - * inside mac80211. - */ - ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid); - break; - default: - break; - } -} -void rt2x00queue_pause_queue(struct data_queue *queue) -{ - if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) || - !test_bit(QUEUE_STARTED, &queue->flags) || - test_and_set_bit(QUEUE_PAUSED, &queue->flags)) - return; - - rt2x00queue_pause_queue_nocheck(queue); -} -EXPORT_SYMBOL_GPL(rt2x00queue_pause_queue); - -void rt2x00queue_unpause_queue(struct data_queue *queue) -{ - if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) || - !test_bit(QUEUE_STARTED, &queue->flags) || - !test_and_clear_bit(QUEUE_PAUSED, &queue->flags)) - return; - - switch (queue->qid) { - case QID_AC_VO: - case QID_AC_VI: - case QID_AC_BE: - case QID_AC_BK: - /* - * For TX queues, we have to enable the queue - * inside mac80211. - */ - ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid); - break; - case QID_RX: - /* - * For RX we need to kick the queue now in order to - * receive frames. - */ - queue->rt2x00dev->ops->lib->kick_queue(queue); - default: - break; - } -} -EXPORT_SYMBOL_GPL(rt2x00queue_unpause_queue); - -void rt2x00queue_start_queue(struct data_queue *queue) -{ - mutex_lock(&queue->status_lock); - - if (!test_bit(DEVICE_STATE_PRESENT, &queue->rt2x00dev->flags) || - test_and_set_bit(QUEUE_STARTED, &queue->flags)) { - mutex_unlock(&queue->status_lock); - return; - } - - set_bit(QUEUE_PAUSED, &queue->flags); - - queue->rt2x00dev->ops->lib->start_queue(queue); - - rt2x00queue_unpause_queue(queue); - - mutex_unlock(&queue->status_lock); -} -EXPORT_SYMBOL_GPL(rt2x00queue_start_queue); - -void rt2x00queue_stop_queue(struct data_queue *queue) -{ - mutex_lock(&queue->status_lock); - - if (!test_and_clear_bit(QUEUE_STARTED, &queue->flags)) { - mutex_unlock(&queue->status_lock); - return; - } - - rt2x00queue_pause_queue_nocheck(queue); - - queue->rt2x00dev->ops->lib->stop_queue(queue); - - mutex_unlock(&queue->status_lock); -} -EXPORT_SYMBOL_GPL(rt2x00queue_stop_queue); - -void rt2x00queue_flush_queue(struct data_queue *queue, bool drop) -{ - bool tx_queue = - (queue->qid == QID_AC_VO) || - (queue->qid == QID_AC_VI) || - (queue->qid == QID_AC_BE) || - (queue->qid == QID_AC_BK); - - - /* - * If we are not supposed to drop any pending - * frames, this means we must force a start (=kick) - * to the queue to make sure the hardware will - * start transmitting. - */ - if (!drop && tx_queue) - queue->rt2x00dev->ops->lib->kick_queue(queue); - - /* - * Check if driver supports flushing, if that is the case we can - * defer the flushing to the driver. Otherwise we must use the - * alternative which just waits for the queue to become empty. - */ - if (likely(queue->rt2x00dev->ops->lib->flush_queue)) - queue->rt2x00dev->ops->lib->flush_queue(queue, drop); - - /* - * The queue flush has failed... - */ - if (unlikely(!rt2x00queue_empty(queue))) - rt2x00_warn(queue->rt2x00dev, "Queue %d failed to flush\n", - queue->qid); -} -EXPORT_SYMBOL_GPL(rt2x00queue_flush_queue); - -void rt2x00queue_start_queues(struct rt2x00_dev *rt2x00dev) -{ - struct data_queue *queue; - - /* - * rt2x00queue_start_queue will call ieee80211_wake_queue - * for each queue after is has been properly initialized. - */ - tx_queue_for_each(rt2x00dev, queue) - rt2x00queue_start_queue(queue); - - rt2x00queue_start_queue(rt2x00dev->rx); -} -EXPORT_SYMBOL_GPL(rt2x00queue_start_queues); - -void rt2x00queue_stop_queues(struct rt2x00_dev *rt2x00dev) -{ - struct data_queue *queue; - - /* - * rt2x00queue_stop_queue will call ieee80211_stop_queue - * as well, but we are completely shutting doing everything - * now, so it is much safer to stop all TX queues at once, - * and use rt2x00queue_stop_queue for cleaning up. - */ - ieee80211_stop_queues(rt2x00dev->hw); - - tx_queue_for_each(rt2x00dev, queue) - rt2x00queue_stop_queue(queue); - - rt2x00queue_stop_queue(rt2x00dev->rx); -} -EXPORT_SYMBOL_GPL(rt2x00queue_stop_queues); - -void rt2x00queue_flush_queues(struct rt2x00_dev *rt2x00dev, bool drop) -{ - struct data_queue *queue; - - tx_queue_for_each(rt2x00dev, queue) - rt2x00queue_flush_queue(queue, drop); - - rt2x00queue_flush_queue(rt2x00dev->rx, drop); -} -EXPORT_SYMBOL_GPL(rt2x00queue_flush_queues); - -static void rt2x00queue_reset(struct data_queue *queue) -{ - unsigned long irqflags; - unsigned int i; - - spin_lock_irqsave(&queue->index_lock, irqflags); - - queue->count = 0; - queue->length = 0; - - for (i = 0; i < Q_INDEX_MAX; i++) - queue->index[i] = 0; - - spin_unlock_irqrestore(&queue->index_lock, irqflags); -} - -void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev) -{ - struct data_queue *queue; - unsigned int i; - - queue_for_each(rt2x00dev, queue) { - rt2x00queue_reset(queue); - - for (i = 0; i < queue->limit; i++) - rt2x00dev->ops->lib->clear_entry(&queue->entries[i]); - } -} - -static int rt2x00queue_alloc_entries(struct data_queue *queue) -{ - struct queue_entry *entries; - unsigned int entry_size; - unsigned int i; - - rt2x00queue_reset(queue); - - /* - * Allocate all queue entries. - */ - entry_size = sizeof(*entries) + queue->priv_size; - entries = kcalloc(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), queue->priv_size); - } - -#undef QUEUE_ENTRY_PRIV_OFFSET - - queue->entries = entries; - - return 0; -} - -static void rt2x00queue_free_skbs(struct data_queue *queue) -{ - unsigned int i; - - if (!queue->entries) - return; - - for (i = 0; i < queue->limit; i++) { - rt2x00queue_free_skb(&queue->entries[i]); - } -} - -static int rt2x00queue_alloc_rxskbs(struct data_queue *queue) -{ - unsigned int i; - struct sk_buff *skb; - - for (i = 0; i < queue->limit; i++) { - skb = rt2x00queue_alloc_rxskb(&queue->entries[i], GFP_KERNEL); - if (!skb) - return -ENOMEM; - queue->entries[i].skb = skb; - } - - return 0; -} - -int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev) -{ - struct data_queue *queue; - int status; - - status = rt2x00queue_alloc_entries(rt2x00dev->rx); - if (status) - goto exit; - - tx_queue_for_each(rt2x00dev, queue) { - status = rt2x00queue_alloc_entries(queue); - if (status) - goto exit; - } - - status = rt2x00queue_alloc_entries(rt2x00dev->bcn); - if (status) - goto exit; - - if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE)) { - status = rt2x00queue_alloc_entries(rt2x00dev->atim); - if (status) - goto exit; - } - - status = rt2x00queue_alloc_rxskbs(rt2x00dev->rx); - if (status) - goto exit; - - return 0; - -exit: - rt2x00_err(rt2x00dev, "Queue entries allocation failed\n"); - - rt2x00queue_uninitialize(rt2x00dev); - - return status; -} - -void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev) -{ - struct data_queue *queue; - - rt2x00queue_free_skbs(rt2x00dev->rx); - - 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) -{ - mutex_init(&queue->status_lock); - spin_lock_init(&queue->tx_lock); - spin_lock_init(&queue->index_lock); - - queue->rt2x00dev = rt2x00dev; - queue->qid = qid; - queue->txop = 0; - queue->aifs = 2; - queue->cw_min = 5; - queue->cw_max = 10; - - rt2x00dev->ops->queue_init(queue); - - queue->threshold = DIV_ROUND_UP(queue->limit, 10); -} - -int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev) -{ - struct data_queue *queue; - enum data_queue_qid qid; - unsigned int req_atim = - rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE); - - /* - * 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 = kcalloc(rt2x00dev->data_queues, sizeof(*queue), GFP_KERNEL); - if (!queue) { - rt2x00_err(rt2x00dev, "Queue allocation failed\n"); - return -ENOMEM; - } - - /* - * Initialize pointers - */ - rt2x00dev->rx = queue; - rt2x00dev->tx = &queue[1]; - rt2x00dev->bcn = &queue[1 + rt2x00dev->ops->tx_queues]; - rt2x00dev->atim = req_atim ? &queue[2 + rt2x00dev->ops->tx_queues] : NULL; - - /* - * Initialize queue parameters. - * RX: qid = QID_RX - * TX: qid = QID_AC_VO + index - * TX: cw_min: 2^5 = 32. - * TX: cw_max: 2^10 = 1024. - * BCN: qid = QID_BEACON - * ATIM: qid = QID_ATIM - */ - rt2x00queue_init(rt2x00dev, rt2x00dev->rx, QID_RX); - - qid = QID_AC_VO; - tx_queue_for_each(rt2x00dev, queue) - rt2x00queue_init(rt2x00dev, queue, qid++); - - rt2x00queue_init(rt2x00dev, rt2x00dev->bcn, QID_BEACON); - if (req_atim) - rt2x00queue_init(rt2x00dev, rt2x00dev->atim, QID_ATIM); - - return 0; -} - -void rt2x00queue_free(struct rt2x00_dev *rt2x00dev) -{ - kfree(rt2x00dev->rx); - rt2x00dev->rx = NULL; - rt2x00dev->tx = NULL; - rt2x00dev->bcn = NULL; -} |