mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 03:42:52 +00:00
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 {
|
||||
u8 noise;
|
||||
u8 slot_time;
|
||||
u8 aifsn[4];
|
||||
struct {
|
||||
__le64 buf;
|
||||
struct urb *urb;
|
||||
struct sk_buff_head queue;
|
||||
} b_tx_status;
|
||||
};
|
||||
|
||||
void rtl8187_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data);
|
||||
|
||||
@ -176,8 +176,27 @@ static void rtl8187_tx_cb(struct urb *urb)
|
||||
skb_pull(skb, priv->is_rtl8187b ? sizeof(struct rtl8187b_tx_hdr) :
|
||||
sizeof(struct rtl8187_tx_hdr));
|
||||
ieee80211_tx_info_clear_status(info);
|
||||
info->flags |= IEEE80211_TX_STAT_ACK;
|
||||
ieee80211_tx_status_irqsafe(hw, skb);
|
||||
|
||||
if (!urb->status &&
|
||||
!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
|
||||
priv->is_rtl8187b) {
|
||||
skb_queue_tail(&priv->b_tx_status.queue, skb);
|
||||
|
||||
/* queue is "full", discard last items */
|
||||
while (skb_queue_len(&priv->b_tx_status.queue) > 5) {
|
||||
struct sk_buff *old_skb;
|
||||
|
||||
dev_dbg(&priv->udev->dev,
|
||||
"transmit status queue full\n");
|
||||
|
||||
old_skb = skb_dequeue(&priv->b_tx_status.queue);
|
||||
ieee80211_tx_status_irqsafe(hw, old_skb);
|
||||
}
|
||||
} else {
|
||||
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !urb->status)
|
||||
info->flags |= IEEE80211_TX_STAT_ACK;
|
||||
ieee80211_tx_status_irqsafe(hw, skb);
|
||||
}
|
||||
}
|
||||
|
||||
static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
|
||||
@ -219,7 +238,7 @@ static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
|
||||
hdr->flags = cpu_to_le32(flags);
|
||||
hdr->len = 0;
|
||||
hdr->rts_duration = rts_dur;
|
||||
hdr->retry = cpu_to_le32((info->control.rates[0].count - 1) << 8);
|
||||
hdr->retry = cpu_to_le32(info->control.rates[0].count << 8);
|
||||
buf = hdr;
|
||||
|
||||
ep = 2;
|
||||
@ -237,7 +256,7 @@ static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
|
||||
memset(hdr, 0, sizeof(*hdr));
|
||||
hdr->flags = cpu_to_le32(flags);
|
||||
hdr->rts_duration = rts_dur;
|
||||
hdr->retry = cpu_to_le32((info->control.rates[0].count - 1) << 8);
|
||||
hdr->retry = cpu_to_le32(info->control.rates[0].count << 8);
|
||||
hdr->tx_duration =
|
||||
ieee80211_generic_frame_duration(dev, priv->vif,
|
||||
skb->len, txrate);
|
||||
@ -403,6 +422,109 @@ static int rtl8187_init_urbs(struct ieee80211_hw *dev)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rtl8187b_status_cb(struct urb *urb)
|
||||
{
|
||||
struct ieee80211_hw *hw = (struct ieee80211_hw *)urb->context;
|
||||
struct rtl8187_priv *priv = hw->priv;
|
||||
u64 val;
|
||||
unsigned int cmd_type;
|
||||
|
||||
if (unlikely(urb->status)) {
|
||||
usb_free_urb(urb);
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read from status buffer:
|
||||
*
|
||||
* bits [30:31] = cmd type:
|
||||
* - 0 indicates tx beacon interrupt
|
||||
* - 1 indicates tx close descriptor
|
||||
*
|
||||
* In the case of tx beacon interrupt:
|
||||
* [0:9] = Last Beacon CW
|
||||
* [10:29] = reserved
|
||||
* [30:31] = 00b
|
||||
* [32:63] = Last Beacon TSF
|
||||
*
|
||||
* If it's tx close descriptor:
|
||||
* [0:7] = Packet Retry Count
|
||||
* [8:14] = RTS Retry Count
|
||||
* [15] = TOK
|
||||
* [16:27] = Sequence No
|
||||
* [28] = LS
|
||||
* [29] = FS
|
||||
* [30:31] = 01b
|
||||
* [32:47] = unused (reserved?)
|
||||
* [48:63] = MAC Used Time
|
||||
*/
|
||||
val = le64_to_cpu(priv->b_tx_status.buf);
|
||||
|
||||
cmd_type = (val >> 30) & 0x3;
|
||||
if (cmd_type == 1) {
|
||||
unsigned int pkt_rc, seq_no;
|
||||
bool tok;
|
||||
struct sk_buff *skb;
|
||||
struct ieee80211_hdr *ieee80211hdr;
|
||||
unsigned long flags;
|
||||
|
||||
pkt_rc = val & 0xFF;
|
||||
tok = val & (1 << 15);
|
||||
seq_no = (val >> 16) & 0xFFF;
|
||||
|
||||
spin_lock_irqsave(&priv->b_tx_status.queue.lock, flags);
|
||||
skb_queue_reverse_walk(&priv->b_tx_status.queue, skb) {
|
||||
ieee80211hdr = (struct ieee80211_hdr *)skb->data;
|
||||
|
||||
/*
|
||||
* While testing, it was discovered that the seq_no
|
||||
* doesn't actually contains the sequence number.
|
||||
* Instead of returning just the 12 bits of sequence
|
||||
* number, hardware is returning entire sequence control
|
||||
* (fragment number plus sequence number) in a 12 bit
|
||||
* only field overflowing after some time. As a
|
||||
* workaround, just consider the lower bits, and expect
|
||||
* it's unlikely we wrongly ack some sent data
|
||||
*/
|
||||
if ((le16_to_cpu(ieee80211hdr->seq_ctrl)
|
||||
& 0xFFF) == seq_no)
|
||||
break;
|
||||
}
|
||||
if (skb != (struct sk_buff *) &priv->b_tx_status.queue) {
|
||||
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
||||
|
||||
__skb_unlink(skb, &priv->b_tx_status.queue);
|
||||
if (tok)
|
||||
info->flags |= IEEE80211_TX_STAT_ACK;
|
||||
info->status.rates[0].count = pkt_rc;
|
||||
|
||||
ieee80211_tx_status_irqsafe(hw, skb);
|
||||
}
|
||||
spin_unlock_irqrestore(&priv->b_tx_status.queue.lock, flags);
|
||||
}
|
||||
|
||||
usb_submit_urb(urb, GFP_ATOMIC);
|
||||
}
|
||||
|
||||
static int rtl8187b_init_status_urb(struct ieee80211_hw *dev)
|
||||
{
|
||||
struct rtl8187_priv *priv = dev->priv;
|
||||
struct urb *entry;
|
||||
|
||||
entry = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!entry)
|
||||
return -ENOMEM;
|
||||
priv->b_tx_status.urb = entry;
|
||||
|
||||
usb_fill_bulk_urb(entry, priv->udev, usb_rcvbulkpipe(priv->udev, 9),
|
||||
&priv->b_tx_status.buf, sizeof(priv->b_tx_status.buf),
|
||||
rtl8187b_status_cb, dev);
|
||||
|
||||
usb_submit_urb(entry, GFP_KERNEL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rtl8187_cmd_reset(struct ieee80211_hw *dev)
|
||||
{
|
||||
struct rtl8187_priv *priv = dev->priv;
|
||||
@ -755,6 +877,7 @@ static int rtl8187_start(struct ieee80211_hw *dev)
|
||||
(7 << 0 /* long retry limit */) |
|
||||
(7 << 21 /* MAX TX DMA */));
|
||||
rtl8187_init_urbs(dev);
|
||||
rtl8187b_init_status_urb(dev);
|
||||
mutex_unlock(&priv->conf_mutex);
|
||||
return 0;
|
||||
}
|
||||
@ -831,6 +954,9 @@ static void rtl8187_stop(struct ieee80211_hw *dev)
|
||||
usb_kill_urb(info->urb);
|
||||
kfree_skb(skb);
|
||||
}
|
||||
while ((skb = skb_dequeue(&priv->b_tx_status.queue)))
|
||||
dev_kfree_skb_any(skb);
|
||||
usb_kill_urb(priv->b_tx_status.urb);
|
||||
mutex_unlock(&priv->conf_mutex);
|
||||
}
|
||||
|
||||
@ -1317,6 +1443,7 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
|
||||
goto err_free_dev;
|
||||
}
|
||||
mutex_init(&priv->conf_mutex);
|
||||
skb_queue_head_init(&priv->b_tx_status.queue);
|
||||
|
||||
printk(KERN_INFO "%s: hwaddr %pM, %s V%d + %s\n",
|
||||
wiphy_name(dev->wiphy), dev->wiphy->perm_addr,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user