static void cc2520_sack_rx_done(u8 *buf, u8 len)
{
// if this packet we just received requires
// an ACK, trasmit it.
memcpy(cur_rx_buf, buf, len);
cur_rx_buf_len = len;
// NOTE: this is a big hack right now,
// and I'm not sure if it's even needed.
// We introduce a strong coupling between
// the sack layer and the radio layer here
// by providing a mechanism to explicitly
// release the buffer. When I was troubleshooting
// a terrible concurrency bug I added this
// as a possible solution, but I don't
// think it's needed anymore.
cc2520_radio_release_rx();
spin_lock_irqsave(&sack_sl, flags);
if (cc2520_packet_is_ack(cur_rx_buf)) {
if (sack_state == CC2520_SACK_TX_WAIT &&
cc2520_packet_is_ack_to(cur_rx_buf, cur_tx_buf)) {
sack_state = CC2520_SACK_IDLE;
spin_unlock_irqrestore(&sack_sl, flags);
hrtimer_cancel(&timeout_timer);
sack_top->tx_done(CC2520_TX_SUCCESS);
}
else {
spin_unlock_irqrestore(&sack_sl, flags);
INFO((KERN_INFO "[cc2520] - stray ack received.\n"));
}
}
else {
if (cc2520_packet_requires_ack_reply(cur_rx_buf)) {
if (sack_state == CC2520_SACK_IDLE) {
cc2520_packet_create_ack(cur_rx_buf, ack_buf);
sack_state = CC2520_SACK_TX_ACK;
spin_unlock_irqrestore(&sack_sl, flags);
sack_bottom->tx(ack_buf, IEEE154_ACK_FRAME_LENGTH + 1);
sack_top->rx_done(cur_rx_buf, cur_rx_buf_len);
}
else {
spin_unlock_irqrestore(&sack_sl, flags);
INFO((KERN_INFO "[cc2520] - ACK skipped, soft-ack layer busy. %d \n", sack_state));
}
}
else {
spin_unlock_irqrestore(&sack_sl, flags);
sack_top->rx_done(cur_rx_buf, cur_rx_buf_len);
}
}
}
static void cc2520_sack_rx_done(u8 *buf, u8 len)
{
// if this packet we just received requires
// an ACK, trasmit it.
spin_lock(&sack_sl);
if (cc2520_packet_is_ack(buf)) {
if (sack_state == CC2520_SACK_TX_WAIT &&
cc2520_packet_is_ack_to(buf, cur_tx_buf)) {
sack_state = CC2520_SACK_IDLE;
spin_unlock(&sack_sl);
hrtimer_cancel(&timeout_timer);
sack_top->tx_done(CC2520_TX_SUCCESS);
}
else {
spin_unlock(&sack_sl);
INFO((KERN_INFO "[cc2520] - stray ack received.\n"));
}
}
else {
if (cc2520_packet_requires_ack_reply(buf)) {
if (sack_state == CC2520_SACK_IDLE) {
cc2520_packet_create_ack(buf, ack_buf);
sack_state = CC2520_SACK_TX_ACK;
spin_unlock(&sack_sl);
sack_bottom->tx(ack_buf, IEEE154_ACK_FRAME_LENGTH + 1);
sack_top->rx_done(buf, len);
}
else {
spin_unlock(&sack_sl);
INFO((KERN_INFO "[cc2520] - ACK skipped, soft-ack layer busy. %d \n", sack_state));
}
}
else {
spin_unlock(&sack_sl);
sack_top->rx_done(buf, len);
}
}
}
