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rtl8187: feedback transmitted packets using tx close descriptor for 8187B
Realtek 8187B has a receive command queue to feedback beacon interrupt and transmitted packet status. Use it to feedback mac80211 about status of transmitted packets. Unfortunately in the course of testing I found that the sequence number reported by hardware includes entire sequence control in a 12 bit only field, so a workaround is done to check only lowest bits. Tested-by: Larry Finger <Larry.Finger@lwfinger.net> Tested-by: Hin-Tak Leung <htl10@users.sourceforge.net> Signed-off-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Herton Ronaldo Krzesinski
John W. Linville
parent
b4572a9264
commit
3517afdefc
@ -113,6 +113,11 @@ struct rtl8187_priv {
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u8 noise;
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u8 slot_time;
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u8 aifsn[4];
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struct {
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__le64 buf;
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struct urb *urb;
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struct sk_buff_head queue;
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} b_tx_status;
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};
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void rtl8187_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data);
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@ -176,8 +176,27 @@ static void rtl8187_tx_cb(struct urb *urb)
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skb_pull(skb, priv->is_rtl8187b ? sizeof(struct rtl8187b_tx_hdr) :
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sizeof(struct rtl8187_tx_hdr));
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ieee80211_tx_info_clear_status(info);
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if (!urb->status &&
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!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
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priv->is_rtl8187b) {
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skb_queue_tail(&priv->b_tx_status.queue, skb);
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/* queue is "full", discard last items */
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while (skb_queue_len(&priv->b_tx_status.queue) > 5) {
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struct sk_buff *old_skb;
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dev_dbg(&priv->udev->dev,
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"transmit status queue full\n");
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old_skb = skb_dequeue(&priv->b_tx_status.queue);
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ieee80211_tx_status_irqsafe(hw, old_skb);
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}
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} else {
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if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !urb->status)
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info->flags |= IEEE80211_TX_STAT_ACK;
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ieee80211_tx_status_irqsafe(hw, skb);
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}
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}
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static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
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@ -219,7 +238,7 @@ static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
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hdr->flags = cpu_to_le32(flags);
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hdr->len = 0;
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hdr->rts_duration = rts_dur;
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hdr->retry = cpu_to_le32((info->control.rates[0].count - 1) << 8);
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hdr->retry = cpu_to_le32(info->control.rates[0].count << 8);
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buf = hdr;
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ep = 2;
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@ -237,7 +256,7 @@ static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
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memset(hdr, 0, sizeof(*hdr));
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hdr->flags = cpu_to_le32(flags);
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hdr->rts_duration = rts_dur;
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hdr->retry = cpu_to_le32((info->control.rates[0].count - 1) << 8);
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hdr->retry = cpu_to_le32(info->control.rates[0].count << 8);
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hdr->tx_duration =
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ieee80211_generic_frame_duration(dev, priv->vif,
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skb->len, txrate);
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@ -403,6 +422,109 @@ static int rtl8187_init_urbs(struct ieee80211_hw *dev)
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return 0;
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}
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static void rtl8187b_status_cb(struct urb *urb)
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{
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struct ieee80211_hw *hw = (struct ieee80211_hw *)urb->context;
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struct rtl8187_priv *priv = hw->priv;
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u64 val;
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unsigned int cmd_type;
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if (unlikely(urb->status)) {
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usb_free_urb(urb);
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return;
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}
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/*
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* Read from status buffer:
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*
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* bits [30:31] = cmd type:
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* - 0 indicates tx beacon interrupt
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* - 1 indicates tx close descriptor
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*
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* In the case of tx beacon interrupt:
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* [0:9] = Last Beacon CW
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* [10:29] = reserved
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* [30:31] = 00b
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* [32:63] = Last Beacon TSF
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*
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* If it's tx close descriptor:
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* [0:7] = Packet Retry Count
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* [8:14] = RTS Retry Count
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* [15] = TOK
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* [16:27] = Sequence No
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* [28] = LS
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* [29] = FS
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* [30:31] = 01b
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* [32:47] = unused (reserved?)
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* [48:63] = MAC Used Time
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*/
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val = le64_to_cpu(priv->b_tx_status.buf);
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cmd_type = (val >> 30) & 0x3;
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if (cmd_type == 1) {
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unsigned int pkt_rc, seq_no;
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bool tok;
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struct sk_buff *skb;
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struct ieee80211_hdr *ieee80211hdr;
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unsigned long flags;
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pkt_rc = val & 0xFF;
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tok = val & (1 << 15);
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seq_no = (val >> 16) & 0xFFF;
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spin_lock_irqsave(&priv->b_tx_status.queue.lock, flags);
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skb_queue_reverse_walk(&priv->b_tx_status.queue, skb) {
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ieee80211hdr = (struct ieee80211_hdr *)skb->data;
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/*
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* While testing, it was discovered that the seq_no
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* doesn't actually contains the sequence number.
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* Instead of returning just the 12 bits of sequence
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* number, hardware is returning entire sequence control
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* (fragment number plus sequence number) in a 12 bit
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* only field overflowing after some time. As a
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* workaround, just consider the lower bits, and expect
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* it's unlikely we wrongly ack some sent data
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*/
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if ((le16_to_cpu(ieee80211hdr->seq_ctrl)
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& 0xFFF) == seq_no)
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break;
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}
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if (skb != (struct sk_buff *) &priv->b_tx_status.queue) {
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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__skb_unlink(skb, &priv->b_tx_status.queue);
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if (tok)
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info->flags |= IEEE80211_TX_STAT_ACK;
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info->status.rates[0].count = pkt_rc;
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ieee80211_tx_status_irqsafe(hw, skb);
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}
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spin_unlock_irqrestore(&priv->b_tx_status.queue.lock, flags);
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}
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usb_submit_urb(urb, GFP_ATOMIC);
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}
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static int rtl8187b_init_status_urb(struct ieee80211_hw *dev)
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{
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struct rtl8187_priv *priv = dev->priv;
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struct urb *entry;
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entry = usb_alloc_urb(0, GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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priv->b_tx_status.urb = entry;
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usb_fill_bulk_urb(entry, priv->udev, usb_rcvbulkpipe(priv->udev, 9),
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&priv->b_tx_status.buf, sizeof(priv->b_tx_status.buf),
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rtl8187b_status_cb, dev);
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usb_submit_urb(entry, GFP_KERNEL);
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return 0;
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}
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static int rtl8187_cmd_reset(struct ieee80211_hw *dev)
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{
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struct rtl8187_priv *priv = dev->priv;
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@ -755,6 +877,7 @@ static int rtl8187_start(struct ieee80211_hw *dev)
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(7 << 0 /* long retry limit */) |
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(7 << 21 /* MAX TX DMA */));
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rtl8187_init_urbs(dev);
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rtl8187b_init_status_urb(dev);
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mutex_unlock(&priv->conf_mutex);
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return 0;
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}
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@ -831,6 +954,9 @@ static void rtl8187_stop(struct ieee80211_hw *dev)
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usb_kill_urb(info->urb);
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kfree_skb(skb);
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}
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while ((skb = skb_dequeue(&priv->b_tx_status.queue)))
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dev_kfree_skb_any(skb);
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usb_kill_urb(priv->b_tx_status.urb);
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mutex_unlock(&priv->conf_mutex);
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}
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@ -1317,6 +1443,7 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
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goto err_free_dev;
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}
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mutex_init(&priv->conf_mutex);
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skb_queue_head_init(&priv->b_tx_status.queue);
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printk(KERN_INFO "%s: hwaddr %pM, %s V%d + %s\n",
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wiphy_name(dev->wiphy), dev->wiphy->perm_addr,
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