add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/net/ipv4/tcp_metrics.c
..
..
@@ -329,7 +329,7 @@
329
329
 	int m;
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330
 
331
331
 	sk_dst_confirm(sk);
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-	if (net->ipv4.sysctl_tcp_nometrics_save || !dst)
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+	if (READ_ONCE(net->ipv4.sysctl_tcp_nometrics_save) || !dst)
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 		return;
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334
 
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 	rcu_read_lock();
..
..
@@ -385,7 +385,8 @@
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385
 
386
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 	if (tcp_in_initial_slowstart(tp)) {
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387
 		/* Slow start still did not finish. */
388
-		if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
388
+		if (!READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) &&
389
+		    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
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 			val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
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 			if (val && (tp->snd_cwnd >> 1) > val)
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 				tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
..
..
@@ -400,7 +401,8 @@
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 	} else if (!tcp_in_slow_start(tp) &&
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 		   icsk->icsk_ca_state == TCP_CA_Open) {
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 		/* Cong. avoidance phase, cwnd is reliable. */
403
-		if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
404
+		if (!READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) &&
405
+		    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
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406
 			tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
405
407
 				       max(tp->snd_cwnd >> 1, tp->snd_ssthresh));
406
408
 		if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
..
..
@@ -416,7 +418,8 @@
416
418
 			tcp_metric_set(tm, TCP_METRIC_CWND,
417
419
 				       (val + tp->snd_ssthresh) >> 1);
418
420
 		}
419
-		if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
421
+		if (!READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) &&
422
+		    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
420
423
 			val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
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424
 			if (val && tp->snd_ssthresh > val)
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 				tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
..
..
@@ -425,7 +428,8 @@
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428
 		if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) {
426
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 			val = tcp_metric_get(tm, TCP_METRIC_REORDERING);
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 			if (val < tp->reordering &&
428
-			    tp->reordering != net->ipv4.sysctl_tcp_reordering)
431
+			    tp->reordering !=
432
+			    READ_ONCE(net->ipv4.sysctl_tcp_reordering))
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433
 				tcp_metric_set(tm, TCP_METRIC_REORDERING,
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 					       tp->reordering);
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435
 		}
..
..
@@ -441,6 +445,7 @@
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 {
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 	struct dst_entry *dst = __sk_dst_get(sk);
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 	struct tcp_sock *tp = tcp_sk(sk);
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+	struct net *net = sock_net(sk);
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 	struct tcp_metrics_block *tm;
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450
 	u32 val, crtt = 0; /* cached RTT scaled by 8 */
446
451
 
..
..
@@ -458,7 +463,8 @@
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463
 	if (tcp_metric_locked(tm, TCP_METRIC_CWND))
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 		tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND);
460
465
 
461
-	val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
466
+	val = READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) ?
467
+	      0 : tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
462
468
 	if (val) {
463
469
 		tp->snd_ssthresh = val;
464
470
 		if (tp->snd_ssthresh > tp->snd_cwnd_clamp)
..
..
@@ -512,16 +518,6 @@
512
518
 
513
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 		inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK;
514
520
 	}
515
-	/* Cut cwnd down to 1 per RFC5681 if SYN or SYN-ACK has been
516
-	 * retransmitted. In light of RFC6298 more aggressive 1sec
517
-	 * initRTO, we only reset cwnd when more than 1 SYN/SYN-ACK
518
-	 * retransmission has occurred.
519
-	 */
520
-	if (tp->total_retrans > 1)
521
-		tp->snd_cwnd = 1;
522
-	else
523
-		tp->snd_cwnd = tcp_init_cwnd(tp, dst);
524
-	tp->snd_cwnd_stamp = tcp_jiffies32;
525
521
 }
526
522
 
527
523
 bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst)
..
..
@@ -658,7 +654,7 @@
658
654
 	{
659
655
 		int n = 0;
660
656
 
661
-		nest = nla_nest_start(msg, TCP_METRICS_ATTR_VALS);
657
+		nest = nla_nest_start_noflag(msg, TCP_METRICS_ATTR_VALS);
662
658
 		if (!nest)
663
659
 			goto nla_put_failure;
664
660
 		for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) {
..
..
@@ -948,17 +944,17 @@
948
944
 	return 0;
949
945
 }
950
946
 
951
-static const struct genl_ops tcp_metrics_nl_ops[] = {
947
+static const struct genl_small_ops tcp_metrics_nl_ops[] = {
952
948
 	{
953
949
 		.cmd = TCP_METRICS_CMD_GET,
950
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
954
951
 		.doit = tcp_metrics_nl_cmd_get,
955
952
 		.dumpit = tcp_metrics_nl_dump,
956
-		.policy = tcp_metrics_nl_policy,
957
953
 	},
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954
 	{
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 		.cmd = TCP_METRICS_CMD_DEL,
956
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
960
957
 		.doit = tcp_metrics_nl_cmd_del,
961
-		.policy = tcp_metrics_nl_policy,
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958
 		.flags = GENL_ADMIN_PERM,
963
959
 	},
964
960
 };
..
..
@@ -968,10 +964,11 @@
968
964
 	.name		= TCP_METRICS_GENL_NAME,
969
965
 	.version	= TCP_METRICS_GENL_VERSION,
970
966
 	.maxattr	= TCP_METRICS_ATTR_MAX,
967
+	.policy = tcp_metrics_nl_policy,
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968
 	.netnsok	= true,
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969
 	.module		= THIS_MODULE,
973
-	.ops		= tcp_metrics_nl_ops,
974
-	.n_ops		= ARRAY_SIZE(tcp_metrics_nl_ops),
970
+	.small_ops	= tcp_metrics_nl_ops,
971
+	.n_small_ops	= ARRAY_SIZE(tcp_metrics_nl_ops),
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972
 };
976
973
 
977
974
 static unsigned int tcpmhash_entries;
..
..
@@ -1000,7 +997,7 @@
1000
997
 
1001
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 	slots = tcpmhash_entries;
1002
999
 	if (!slots) {
1003
-		if (totalram_pages >= 128 * 1024)
1000
+		if (totalram_pages() >= 128 * 1024)
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1001
 			slots = 16 * 1024;
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1002
 		else
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1003
 			slots = 8 * 1024;