142 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_hystart_update()  local
145 	ca->delay_min = min_not_zero(ca->delay_min, ca->rtt.min);  in tcp_cdg_hystart_update()
146 	if (ca->delay_min == 0)  in tcp_cdg_hystart_update()
152 		if (ca->last_ack == 0 || !tcp_is_cwnd_limited(sk)) {  in tcp_cdg_hystart_update()
153 			ca->last_ack = now_us;  in tcp_cdg_hystart_update()
154 			ca->round_start = now_us;  in tcp_cdg_hystart_update()
155 		} else if (before(now_us, ca->last_ack + 3000)) {  in tcp_cdg_hystart_update()
156 			u32 base_owd = max(ca->delay_min / 2U, 125U);  in tcp_cdg_hystart_update()
158 			ca->last_ack = now_us;  in tcp_cdg_hystart_update()
159 			if (after(now_us, ca->round_start + base_owd)) {  in tcp_cdg_hystart_update()
172 		if (ca->sample_cnt < 8) {  in tcp_cdg_hystart_update()
173 			ca->sample_cnt++;  in tcp_cdg_hystart_update()
175 			s32 thresh = max(ca->delay_min + ca->delay_min / 8U,  in tcp_cdg_hystart_update()
178 			if (ca->rtt.min > thresh) {  in tcp_cdg_hystart_update()
190 static s32 tcp_cdg_grad(struct cdg *ca)  in tcp_cdg_grad()  argument
192 	s32 gmin = ca->rtt.min - ca->rtt_prev.min;  in tcp_cdg_grad()
193 	s32 gmax = ca->rtt.max - ca->rtt_prev.max;  in tcp_cdg_grad()
196 	if (ca->gradients) {  in tcp_cdg_grad()
197 		ca->gsum.min += gmin - ca->gradients[ca->tail].min;  in tcp_cdg_grad()
198 		ca->gsum.max += gmax - ca->gradients[ca->tail].max;  in tcp_cdg_grad()
199 		ca->gradients[ca->tail].min = gmin;  in tcp_cdg_grad()
200 		ca->gradients[ca->tail].max = gmax;  in tcp_cdg_grad()
201 		ca->tail = (ca->tail + 1) & (window - 1);  in tcp_cdg_grad()
202 		gmin = ca->gsum.min;  in tcp_cdg_grad()
203 		gmax = ca->gsum.max;  in tcp_cdg_grad()
215 	if (!ca->gfilled) {  in tcp_cdg_grad()
216 		if (!ca->gradients && window > 1)  in tcp_cdg_grad()
218 		else if (ca->tail == 0)  in tcp_cdg_grad()
219 			ca->gfilled = true;  in tcp_cdg_grad()
221 			grad = (grad * window) / (int)ca->tail;  in tcp_cdg_grad()
226 		ca->backoff_cnt = 0;  in tcp_cdg_grad()
234 			ca->state = CDG_FULL;  in tcp_cdg_grad()
236 			ca->state = CDG_NONFULL;  in tcp_cdg_grad()
243 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_backoff()  local
250 		ca->backoff_cnt++;  in tcp_cdg_backoff()
251 		if (ca->backoff_cnt > use_ineff)  in tcp_cdg_backoff()
255 	ca->shadow_wnd = max(ca->shadow_wnd, tcp_snd_cwnd(tp));  in tcp_cdg_backoff()
256 	ca->state = CDG_BACKOFF;  in tcp_cdg_backoff()
264 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_cong_avoid()  local
272 	if (after(ack, ca->rtt_seq) && ca->rtt.v64) {  in tcp_cdg_cong_avoid()
275 		if (ca->rtt_prev.v64)  in tcp_cdg_cong_avoid()
276 			grad = tcp_cdg_grad(ca);  in tcp_cdg_cong_avoid()
277 		ca->rtt_seq = tp->snd_nxt;  in tcp_cdg_cong_avoid()
278 		ca->rtt_prev = ca->rtt;  in tcp_cdg_cong_avoid()
279 		ca->rtt.v64 = 0;  in tcp_cdg_cong_avoid()
280 		ca->last_ack = 0;  in tcp_cdg_cong_avoid()
281 		ca->sample_cnt = 0;  in tcp_cdg_cong_avoid()
288 		ca->shadow_wnd = min(ca->shadow_wnd, tcp_snd_cwnd(tp));  in tcp_cdg_cong_avoid()
296 	ca->shadow_wnd = max(ca->shadow_wnd, ca->shadow_wnd + incr);  in tcp_cdg_cong_avoid()
301 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_acked()  local
312 		if (sample->pkts_acked == 1 && ca->delack) {  in tcp_cdg_acked()
316 			ca->rtt.min = min(ca->rtt.min, sample->rtt_us);  in tcp_cdg_acked()
317 			ca->delack--;  in tcp_cdg_acked()
319 		} else if (sample->pkts_acked > 1 && ca->delack < 5) {  in tcp_cdg_acked()
320 			ca->delack++;  in tcp_cdg_acked()
324 	ca->rtt.min = min_not_zero(ca->rtt.min, sample->rtt_us);  in tcp_cdg_acked()
325 	ca->rtt.max = max(ca->rtt.max, sample->rtt_us);  in tcp_cdg_acked()
330 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_ssthresh()  local
333 	if (ca->state == CDG_BACKOFF)  in tcp_cdg_ssthresh()
336 	if (ca->state == CDG_NONFULL && use_tolerance)  in tcp_cdg_ssthresh()
339 	ca->shadow_wnd = min(ca->shadow_wnd >> 1, tcp_snd_cwnd(tp));  in tcp_cdg_ssthresh()
341 		return max3(2U, ca->shadow_wnd, tcp_snd_cwnd(tp) >> 1);  in tcp_cdg_ssthresh()
347 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_cwnd_event()  local
353 		gradients = ca->gradients;  in tcp_cdg_cwnd_event()
356 		memset(ca, 0, sizeof(*ca));  in tcp_cdg_cwnd_event()
358 		ca->gradients = gradients;  in tcp_cdg_cwnd_event()
359 		ca->rtt_seq = tp->snd_nxt;  in tcp_cdg_cwnd_event()
360 		ca->shadow_wnd = tcp_snd_cwnd(tp);  in tcp_cdg_cwnd_event()
363 		ca->state = CDG_UNKNOWN;  in tcp_cdg_cwnd_event()
364 		ca->rtt_seq = tp->snd_nxt;  in tcp_cdg_cwnd_event()
365 		ca->rtt_prev = ca->rtt;  in tcp_cdg_cwnd_event()
366 		ca->rtt.v64 = 0;  in tcp_cdg_cwnd_event()
375 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_init()  local
378 	ca->gradients = NULL;  in tcp_cdg_init()
381 		ca->gradients = kcalloc(window, sizeof(ca->gradients[0]),  in tcp_cdg_init()
383 	ca->rtt_seq = tp->snd_nxt;  in tcp_cdg_init()
384 	ca->shadow_wnd = tcp_snd_cwnd(tp);  in tcp_cdg_init()
389 	struct cdg *ca = inet_csk_ca(sk);  in tcp_cdg_release()  local
391 	kfree(ca->gradients);  in tcp_cdg_release()
392 	ca->gradients = NULL;  in tcp_cdg_release()