+ break;
+ case IEEE80211_AMPDU_TX_START:
+ /* By the time we get here the hw queues may contain outgoing
+ * packets for this RA/TID that are not part of this BA
+ * session. The hw will assign sequence numbers to these
+ * packets as they go out. So if we query the hw for its next
+ * sequence number and use that for the SSN here, it may end up
+ * being wrong, which will lead to sequence number mismatch at
+ * the recipient. To avoid this, we reset the sequence number
+ * to O for the first MPDU in this BA stream.
+ */
+ *ssn = 0;
+ if (stream == NULL) {
+ /* This means that somebody outside this driver called
+ * ieee80211_start_tx_ba_session. This is unexpected
+ * because we do our own rate control. Just warn and
+ * move on.
+ */
+ wiphy_warn(hw->wiphy, "Unexpected call to %s. "
+ "Proceeding anyway.\n", __func__);
+ stream = mwl8k_add_stream(hw, sta, tid);
+ }
+ if (stream == NULL) {
+ wiphy_debug(hw->wiphy, "no free AMPDU streams\n");
+ rc = -EBUSY;
+ break;
+ }
+ stream->state = AMPDU_STREAM_IN_PROGRESS;
+
+ /* Release the lock before we do the time consuming stuff */
+ spin_unlock(&priv->stream_lock);
+ for (i = 0; i < MAX_AMPDU_ATTEMPTS; i++) {
+ rc = mwl8k_check_ba(hw, stream);
+
+ if (!rc)
+ break;
+ /*
+ * HW queues take time to be flushed, give them
+ * sufficient time
+ */
+
+ msleep(1000);
+ }
+ spin_lock(&priv->stream_lock);
+ if (rc) {
+ wiphy_err(hw->wiphy, "Stream for tid %d busy after %d"
+ " attempts\n", tid, MAX_AMPDU_ATTEMPTS);
+ mwl8k_remove_stream(hw, stream);
+ rc = -EBUSY;
+ break;
+ }
+ ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
+ break;
+ case IEEE80211_AMPDU_TX_STOP:
+ if (stream == NULL)
+ break;
+ if (stream->state == AMPDU_STREAM_ACTIVE) {
+ spin_unlock(&priv->stream_lock);
+ mwl8k_destroy_ba(hw, stream);
+ spin_lock(&priv->stream_lock);
+ }
+ mwl8k_remove_stream(hw, stream);
+ ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
+ break;
+ case IEEE80211_AMPDU_TX_OPERATIONAL:
+ BUG_ON(stream == NULL);
+ BUG_ON(stream->state != AMPDU_STREAM_IN_PROGRESS);
+ spin_unlock(&priv->stream_lock);
+ rc = mwl8k_create_ba(hw, stream, buf_size);
+ spin_lock(&priv->stream_lock);
+ if (!rc)
+ stream->state = AMPDU_STREAM_ACTIVE;
+ else {
+ spin_unlock(&priv->stream_lock);
+ mwl8k_destroy_ba(hw, stream);
+ spin_lock(&priv->stream_lock);
+ wiphy_debug(hw->wiphy,
+ "Failed adding stream for sta %pM tid %d\n",
+ addr, tid);
+ mwl8k_remove_stream(hw, stream);
+ }
+ break;
+