iwlwifi/mvm/rs.c

25 #define IWL_RATE_MAX_WINDOW		62	/* # tx in history window */
531 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
533 	window->data = 0;
534 	window->success_counter = 0;
535 	window->success_ratio = IWL_INVALID_VALUE;
536 	window->counter = 0;
537 	window->average_tpt = IWL_INVALID_VALUE;
545 	IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
629  * rs_collect_tx_data - Update the success/failure sliding window
631  * We keep a sliding window of the last 62 packets transmitted
632  * at this rate.  window->data contains the bitmask of successful
638 			       struct iwl_rate_scale_data *window)
648 	 * history window; anything older isn't really relevant any more.
649 	 * If we have filled up the sliding window, drop the oldest attempt;
655 		if (window->counter >= IWL_RATE_MAX_WINDOW) {
657 			window->counter = IWL_RATE_MAX_WINDOW - 1;
659 			if (window->data & mask) {
660 				window->data &= ~mask;
661 				window->success_counter--;
666 		window->counter++;
669 		window->data <<= 1;
673 			window->success_counter++;
674 			window->data |= 0x1;
682 	if (window->counter > 0)
683 		window->success_ratio = 128 * (100 * window->success_counter)
684 					/ window->counter;
686 		window->success_ratio = IWL_INVALID_VALUE;
688 	fail_count = window->counter - window->success_counter;
692 	    (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
693 		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
695 		window->average_tpt = IWL_INVALID_VALUE;
706 	struct iwl_rate_scale_data *window = NULL;
711 	window = &tbl->tpc_win[reduced_txp];
713 				    window);
751 	struct iwl_rate_scale_data *window = NULL;
765 	/* Select window for current tx bit rate */
766 	window = &(tbl->win[scale_index]);
768 				   window);
1566 	 * sustainable, i.e. we're past the test window. We can't go back
1968 	struct iwl_rate_scale_data *window;
2004 	window = tbl->tpc_win;
2005 	sr = window[cur].success_ratio;
2006 	current_tpt = window[cur].average_tpt;
2008 		weak_tpt = window[weak].average_tpt;
2010 		strong_tpt = window[strong].average_tpt;
2059 	struct iwl_rate_scale_data *window = NULL;
2117 	/* Get expected throughput table and history window for current rate */
2124 	window = &(tbl->win[index]);
2133 	fail_count = window->counter - window->success_counter;
2135 	    (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2139 			       window->success_counter, window->counter);
2142 		window->average_tpt = IWL_INVALID_VALUE;
2156 		if (window->average_tpt > lq_sta->last_tpt) {
2160 				       window->success_ratio,
2161 				       window->average_tpt,
2166 			current_tpt = window->average_tpt;
2172 				       window->success_ratio,
2173 				       window->average_tpt,
2206 	sr = window->success_ratio;
2209 	current_tpt = window->average_tpt;
2284 	    && window->counter) {
2293 			       window->counter);
2724 	IWL_DEBUG_RATE(mvm, "create station rate scale window\n");