int b43_pio_tx(struct b43_wldev *dev, struct sk_buff *skb)
{
struct b43_pio_txqueue *q;
struct ieee80211_hdr *hdr;
unsigned int hdrlen, total_len;
int err = 0;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
hdr = (struct ieee80211_hdr *)skb->data;
if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
/* The multicast queue will be sent after the DTIM. */
q = dev->pio.tx_queue_mcast;
/* Set the frame More-Data bit. Ucode will clear it
* for us on the last frame. */
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
} else {
/* Decide by priority where to put this frame. */
q = select_queue_by_priority(dev, skb_get_queue_mapping(skb));
}
hdrlen = b43_txhdr_size(dev);
total_len = roundup(skb->len + hdrlen, 4);
if (unlikely(total_len > q->buffer_size)) {
err = -ENOBUFS;
b43dbg(dev->wl, "PIO: TX packet longer than queue.\n");
goto out;
}
if (unlikely(q->free_packet_slots == 0)) {
err = -ENOBUFS;
b43warn(dev->wl, "PIO: TX packet overflow.\n");
goto out;
}
B43_WARN_ON(q->buffer_used > q->buffer_size);
if (total_len > (q->buffer_size - q->buffer_used)) {
/* Not enough memory on the queue. */
err = -EBUSY;
ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
q->stopped = 1;
goto out;
}
/* Assign the queue number to the ring (if not already done before)
* so TX status handling can use it. The mac80211-queue to b43-queue
* mapping is static, so we don't need to store it per frame. */
q->queue_prio = skb_get_queue_mapping(skb);
err = pio_tx_frame(q, skb);
if (unlikely(err == -ENOKEY)) {
/* Drop this packet, as we don't have the encryption key
* anymore and must not transmit it unencrypted. */
dev_kfree_skb_any(skb);
err = 0;
goto out;
}
if (unlikely(err)) {
b43err(dev->wl, "PIO transmission failure\n");
goto out;
}
q->nr_tx_packets++;
B43_WARN_ON(q->buffer_used > q->buffer_size);
if (((q->buffer_size - q->buffer_used) < roundup(2 + 2 + 6, 4)) ||
(q->free_packet_slots == 0)) {
/* The queue is full. */
ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
q->stopped = 1;
}
out:
return err;
}
int b43_pio_tx(struct b43_wldev *dev, struct sk_buff *skb)
{
struct b43_pio_txqueue *q;
struct ieee80211_hdr *hdr;
unsigned int hdrlen, total_len;
int err = 0;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
hdr = (struct ieee80211_hdr *)skb->data;
if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
q = dev->pio.tx_queue_mcast;
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
} else {
q = select_queue_by_priority(dev, skb_get_queue_mapping(skb));
}
hdrlen = b43_txhdr_size(dev);
total_len = roundup(skb->len + hdrlen, 4);
if (unlikely(total_len > q->buffer_size)) {
err = -ENOBUFS;
b43dbg(dev->wl, "PIO: TX packet longer than queue.\n");
goto out;
}
if (unlikely(q->free_packet_slots == 0)) {
err = -ENOBUFS;
b43warn(dev->wl, "PIO: TX packet overflow.\n");
goto out;
}
B43_WARN_ON(q->buffer_used > q->buffer_size);
if (total_len > (q->buffer_size - q->buffer_used)) {
err = -EBUSY;
ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
q->stopped = true;
goto out;
}
q->queue_prio = skb_get_queue_mapping(skb);
err = pio_tx_frame(q, skb);
if (unlikely(err == -ENOKEY)) {
dev_kfree_skb_any(skb);
err = 0;
goto out;
}
if (unlikely(err)) {
b43err(dev->wl, "PIO transmission failure\n");
goto out;
}
B43_WARN_ON(q->buffer_used > q->buffer_size);
if (((q->buffer_size - q->buffer_used) < roundup(2 + 2 + 6, 4)) ||
(q->free_packet_slots == 0)) {
ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
q->stopped = true;
}
out:
return err;
}
