--- /dev/null
+/*
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff