debug lk

hc

2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077

 kernel/net/core/link_watch.c
..
..
@@ -1,14 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Linux network device link state notification
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  *
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  * Author:
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  *     Stefan Rompf <sux@loplof.de>
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- *
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7
  */
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8
 
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 #include <linux/module.h>
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@@ -39,6 +34,9 @@
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34
 
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 static unsigned char default_operstate(const struct net_device *dev)
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 {
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+	if (netif_testing(dev))
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+		return IF_OPER_TESTING;
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+
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 	if (!netif_carrier_ok(dev))
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 		return (dev->ifindex != dev_get_iflink(dev) ?
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 			IF_OPER_LOWERLAYERDOWN : IF_OPER_DOWN);
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@@ -60,11 +58,15 @@
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 	write_lock_bh(&dev_base_lock);
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59
 
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 	switch(dev->link_mode) {
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+	case IF_LINK_MODE_TESTING:
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+		if (operstate == IF_OPER_UP)
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+			operstate = IF_OPER_TESTING;
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+		break;
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+
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 	case IF_LINK_MODE_DORMANT:
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 		if (operstate == IF_OPER_UP)
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 			operstate = IF_OPER_DORMANT;
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 		break;
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-
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 	case IF_LINK_MODE_DEFAULT:
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 	default:
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 		break;
..
..
@@ -79,7 +81,8 @@
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 void linkwatch_init_dev(struct net_device *dev)
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 {
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 	/* Handle pre-registration link state changes */
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-	if (!netif_carrier_ok(dev) || netif_dormant(dev))
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+	if (!netif_carrier_ok(dev) || netif_dormant(dev) ||
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+	    netif_testing(dev))
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 		rfc2863_policy(dev);
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 }
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@@ -168,8 +171,15 @@
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171
 
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 static void __linkwatch_run_queue(int urgent_only)
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 {
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+#define MAX_DO_DEV_PER_LOOP	100
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+
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+	int do_dev = MAX_DO_DEV_PER_LOOP;
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 	struct net_device *dev;
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 	LIST_HEAD(wrk);
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+
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+	/* Give urgent case more budget */
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+	if (urgent_only)
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+		do_dev += MAX_DO_DEV_PER_LOOP;
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183
 
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 	/*
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 	 * Limit the number of linkwatch events to one
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@@ -189,20 +199,25 @@
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 	spin_lock_irq(&lweventlist_lock);
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 	list_splice_init(&lweventlist, &wrk);
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-	while (!list_empty(&wrk)) {
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+	while (!list_empty(&wrk) && do_dev > 0) {
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203
 
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 		dev = list_first_entry(&wrk, struct net_device, link_watch_list);
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 		list_del_init(&dev->link_watch_list);
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-		if (urgent_only && !linkwatch_urgent_event(dev)) {
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+		if (!netif_device_present(dev) ||
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+		    (urgent_only && !linkwatch_urgent_event(dev))) {
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 			list_add_tail(&dev->link_watch_list, &lweventlist);
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 			continue;
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 		}
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 		spin_unlock_irq(&lweventlist_lock);
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 		linkwatch_do_dev(dev);
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+		do_dev--;
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 		spin_lock_irq(&lweventlist_lock);
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 	}
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+	/* Add the remaining work back to lweventlist */
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+	list_splice_init(&wrk, &lweventlist);
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+
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 	if (!list_empty(&lweventlist))
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 		linkwatch_schedule_work(0);
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 	spin_unlock_irq(&lweventlist_lock);