net/ipv4/tcp_lp.c

34  *   http://tcp-lp-mod.sourceforge.net/
61  * struct lp
77 struct lp {
99 	struct lp *lp = inet_csk_ca(sk);
101 	lp->flag = 0;
102 	lp->sowd = 0;
103 	lp->owd_min = 0xffffffff;
104 	lp->owd_max = 0;
105 	lp->owd_max_rsv = 0;
106 	lp->remote_hz = 0;
107 	lp->remote_ref_time = 0;
108 	lp->local_ref_time = 0;
109 	lp->last_drop = 0;
110 	lp->inference = 0;
123 	struct lp *lp = inet_csk_ca(sk);
125 	if (!(lp->flag & LP_WITHIN_INF))
140 	struct lp *lp = inet_csk_ca(sk);
141 	s64 rhz = lp->remote_hz << 6;	/* remote HZ << 6 */
146 	if (lp->remote_ref_time == 0 || lp->local_ref_time == 0)
150 	if (tp->rx_opt.rcv_tsval == lp->remote_ref_time ||
151 	    tp->rx_opt.rcv_tsecr == lp->local_ref_time)
155 	    (tp->rx_opt.rcv_tsval - lp->remote_ref_time) /
156 	    (tp->rx_opt.rcv_tsecr - lp->local_ref_time);
169 		lp->flag |= LP_VALID_RHZ;
171 		lp->flag &= ~LP_VALID_RHZ;
174 	lp->remote_ref_time = tp->rx_opt.rcv_tsval;
175 	lp->local_ref_time = tp->rx_opt.rcv_tsecr;
194 	struct lp *lp = inet_csk_ca(sk);
197 	lp->remote_hz = tcp_lp_remote_hz_estimator(sk);
199 	if (lp->flag & LP_VALID_RHZ) {
201 		    tp->rx_opt.rcv_tsval * (LP_RESOL / lp->remote_hz) -
208 		lp->flag |= LP_VALID_OWD;
210 		lp->flag &= ~LP_VALID_OWD;
229 	struct lp *lp = inet_csk_ca(sk);
233 	if (!(lp->flag & LP_VALID_RHZ) || !(lp->flag & LP_VALID_OWD))
237 	if (mowd < lp->owd_min)
238 		lp->owd_min = mowd;
242 	if (mowd > lp->owd_max) {
243 		if (mowd > lp->owd_max_rsv) {
244 			if (lp->owd_max_rsv == 0)
245 				lp->owd_max = mowd;
247 				lp->owd_max = lp->owd_max_rsv;
248 			lp->owd_max_rsv = mowd;
250 			lp->owd_max = mowd;
254 	if (lp->sowd != 0) {
255 		mowd -= lp->sowd >> 3;	/* m is now error in owd est */
256 		lp->sowd += mowd;	/* owd = 7/8 owd + 1/8 new */
258 		lp->sowd = mowd << 3;	/* take the measured time be owd */
274 	struct lp *lp = inet_csk_ca(sk);
284 		lp->inference = 3 * delta;
287 	if (lp->last_drop && (now - lp->last_drop < lp->inference))
288 		lp->flag |= LP_WITHIN_INF;
290 		lp->flag &= ~LP_WITHIN_INF;
293 	if (lp->sowd >> 3 <
294 	    lp->owd_min + 15 * (lp->owd_max - lp->owd_min) / 100)
295 		lp->flag |= LP_WITHIN_THR;
297 		lp->flag &= ~LP_WITHIN_THR;
299 	pr_debug("TCP-LP: %05o|%5u|%5u|%15u|%15u|%15u\n", lp->flag,
300 		 tcp_snd_cwnd(tp), lp->remote_hz, lp->owd_min, lp->owd_max,
301 		 lp->sowd >> 3);
303 	if (lp->flag & LP_WITHIN_THR)
309 	lp->owd_min = lp->sowd >> 3;
310 	lp->owd_max = lp->sowd >> 2;
311 	lp->owd_max_rsv = lp->sowd >> 2;
315 	if (lp->flag & LP_WITHIN_INF)
324 	lp->last_drop = now;
335 	.name = "lp"
340 	BUILD_BUG_ON(sizeof(struct lp) > ICSK_CA_PRIV_SIZE);