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2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb 
 kernel/net/core/netpoll.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Common framework for low-level network console, dump, and debugger code
34  *
....@@ -58,7 +59,6 @@
5859 	 MAX_UDP_CHUNK)
5960 
6061 static void zap_completion_queue(void);
61
-static void netpoll_async_cleanup(struct work_struct *work);
6262 
6363 static unsigned int carrier_timeout = 4;
6464 module_param(carrier_timeout, uint, 0644);
....@@ -70,10 +70,11 @@
7070 #define np_notice(np, fmt, ...)				\
7171 	pr_notice("%s: " fmt, np->name, ##__VA_ARGS__)
7272 
73
-static int netpoll_start_xmit(struct sk_buff *skb, struct net_device *dev,
74
-			      struct netdev_queue *txq)
73
+static netdev_tx_t netpoll_start_xmit(struct sk_buff *skb,
74
+				      struct net_device *dev,
75
+				      struct netdev_queue *txq)
7576 {
76
-	int status = NETDEV_TX_OK;
77
+	netdev_tx_t status = NETDEV_TX_OK;
7778 	netdev_features_t features;
7879 
7980 	features = netif_skb_features(skb);
....@@ -136,6 +137,20 @@
136137 	}
137138 }
138139 
140
+static int netif_local_xmit_active(struct net_device *dev)
141
+{
142
+	int i;
143
+
144
+	for (i = 0; i < dev->num_tx_queues; i++) {
145
+		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
146
+
147
+		if (READ_ONCE(txq->xmit_lock_owner) == smp_processor_id())
148
+			return 1;
149
+	}
150
+
151
+	return 0;
152
+}
153
+
139154 static void poll_one_napi(struct napi_struct *napi)
140155 {
141156 	int work;
....@@ -151,7 +166,7 @@
151166 	 * indicate that we are clearing the Tx path only.
152167 	 */
153168 	work = napi->poll(napi, 0);
154
-	WARN_ONCE(work, "%pF exceeded budget in poll\n", napi->poll);
169
+	WARN_ONCE(work, "%pS exceeded budget in poll\n", napi->poll);
155170 	trace_napi_poll(napi, work, 0);
156171 
157172 	clear_bit(NAPI_STATE_NPSVC, &napi->state);
....@@ -182,7 +197,10 @@
182197 	if (!ni || down_trylock(&ni->dev_lock))
183198 		return;
184199 
185
-	if (!netif_running(dev)) {
200
+	/* Some drivers will take the same locks in poll and xmit,
201
+	 * we can't poll if local CPU is already in xmit.
202
+	 */
203
+	if (!netif_running(dev) || netif_local_xmit_active(dev)) {
186204 		up(&ni->dev_lock);
187205 		return;
188206 	}
....@@ -297,7 +315,7 @@
297315 {
298316 	struct napi_struct *napi;
299317 
300
-	list_for_each_entry(napi, &dev->napi_list, dev_list) {
318
+	list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) {
301319 		if (napi->poll_owner == smp_processor_id())
302320 			return 1;
303321 	}
....@@ -305,27 +323,29 @@
305323 }
306324 
307325 /* call with IRQ disabled */
308
-void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
309
-			     struct net_device *dev)
326
+static netdev_tx_t __netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
310327 {
311
-	int status = NETDEV_TX_BUSY;
328
+	netdev_tx_t status = NETDEV_TX_BUSY;
329
+	struct net_device *dev;
312330 	unsigned long tries;
313331 	/* It is up to the caller to keep npinfo alive. */
314332 	struct netpoll_info *npinfo;
315333 
316334 	lockdep_assert_irqs_disabled();
317335 
318
-	npinfo = rcu_dereference_bh(np->dev->npinfo);
336
+	dev = np->dev;
337
+	npinfo = rcu_dereference_bh(dev->npinfo);
338
+
319339 	if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
320340 		dev_kfree_skb_irq(skb);
321
-		return;
341
+		return NET_XMIT_DROP;
322342 	}
323343 
324344 	/* don't get messages out of order, and no recursion */
325345 	if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
326346 		struct netdev_queue *txq;
327347 
328
-		txq = netdev_pick_tx(dev, skb, NULL);
348
+		txq = netdev_core_pick_tx(dev, skb, NULL);
329349 
330350 		/* try until next clock tick */
331351 		for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
....@@ -348,7 +368,7 @@
348368 		}
349369 
350370 		WARN_ONCE(!irqs_disabled(),
351
-			"netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n",
371
+			"netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pS)\n",
352372 			dev->name, dev->netdev_ops->ndo_start_xmit);
353373 
354374 	}
....@@ -357,8 +377,25 @@
357377 		skb_queue_tail(&npinfo->txq, skb);
358378 		schedule_delayed_work(&npinfo->tx_work,0);
359379 	}
380
+	return NETDEV_TX_OK;
360381 }
361
-EXPORT_SYMBOL(netpoll_send_skb_on_dev);
382
+
383
+netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
384
+{
385
+	unsigned long flags;
386
+	netdev_tx_t ret;
387
+
388
+	if (unlikely(!np)) {
389
+		dev_kfree_skb_irq(skb);
390
+		ret = NET_XMIT_DROP;
391
+	} else {
392
+		local_irq_save(flags);
393
+		ret = __netpoll_send_skb(np, skb);
394
+		local_irq_restore(flags);
395
+	}
396
+	return ret;
397
+}
398
+EXPORT_SYMBOL(netpoll_send_skb);
362399 
363400 void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
364401 {
....@@ -590,7 +627,6 @@
590627 
591628 	np->dev = ndev;
592629 	strlcpy(np->dev_name, ndev->name, IFNAMSIZ);
593
-	INIT_WORK(&np->cleanup_work, netpoll_async_cleanup);
594630 
595631 	if (ndev->priv_flags & IFF_DISABLE_NETPOLL) {
596632 		np_err(np, "%s doesn't support polling, aborting\n",
....@@ -660,7 +696,7 @@
660696 		if (!netdev_uses_dsa(dev))
661697 			continue;
662698 
663
-		err = dev_change_flags(dev, dev->flags | IFF_UP);
699
+		err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
664700 		if (err < 0) {
665701 			np_err(np, "%s failed to open %s\n",
666702 			       np->dev_name, dev->name);
....@@ -679,7 +715,7 @@
679715 
680716 		np_info(np, "device %s not up yet, forcing it\n", np->dev_name);
681717 
682
-		err = dev_open(ndev);
718
+		err = dev_open(ndev, NULL);
683719 
684720 		if (err) {
685721 			np_err(np, "failed to open %s\n", ndev->name);
....@@ -711,16 +747,22 @@
711747 
712748 	if (!np->local_ip.ip) {
713749 		if (!np->ipv6) {
714
-			in_dev = __in_dev_get_rtnl(ndev);
750
+			const struct in_ifaddr *ifa;
715751 
716
-			if (!in_dev || !in_dev->ifa_list) {
752
+			in_dev = __in_dev_get_rtnl(ndev);
753
+			if (!in_dev)
754
+				goto put_noaddr;
755
+
756
+			ifa = rtnl_dereference(in_dev->ifa_list);
757
+			if (!ifa) {
758
+put_noaddr:
717759 				np_err(np, "no IP address for %s, aborting\n",
718760 				       np->dev_name);
719761 				err = -EDESTADDRREQ;
720762 				goto put;
721763 			}
722764 
723
-			np->local_ip.ip = in_dev->ifa_list->ifa_local;
765
+			np->local_ip.ip = ifa->ifa_local;
724766 			np_info(np, "local IP %pI4\n", &np->local_ip.ip);
725767 		} else {
726768 #if IS_ENABLED(CONFIG_IPV6)
....@@ -733,7 +775,8 @@
733775 
734776 				read_lock_bh(&idev->lock);
735777 				list_for_each_entry(ifp, &idev->addr_list, if_list) {
736
-					if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)
778
+					if (!!(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) !=
779
+					    !!(ipv6_addr_type(&np->remote_ip.in6) & IPV6_ADDR_LINKLOCAL))
737780 						continue;
738781 					np->local_ip.in6 = ifp->addr;
739782 					err = 0;
....@@ -802,10 +845,6 @@
802845 {
803846 	struct netpoll_info *npinfo;
804847 
805
-	/* rtnl_dereference would be preferable here but
806
-	 * rcu_cleanup_netpoll path can put us in here safely without
807
-	 * holding the rtnl, so plain rcu_dereference it is
808
-	 */
809848 	npinfo = rtnl_dereference(np->dev->npinfo);
810849 	if (!npinfo)
811850 		return;
....@@ -820,27 +859,22 @@
820859 			ops->ndo_netpoll_cleanup(np->dev);
821860 
822861 		RCU_INIT_POINTER(np->dev->npinfo, NULL);
823
-		call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info);
862
+		call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info);
824863 	} else
825864 		RCU_INIT_POINTER(np->dev->npinfo, NULL);
826865 }
827866 EXPORT_SYMBOL_GPL(__netpoll_cleanup);
828867 
829
-static void netpoll_async_cleanup(struct work_struct *work)
868
+void __netpoll_free(struct netpoll *np)
830869 {
831
-	struct netpoll *np = container_of(work, struct netpoll, cleanup_work);
870
+	ASSERT_RTNL();
832871 
833
-	rtnl_lock();
872
+	/* Wait for transmitting packets to finish before freeing. */
873
+	synchronize_rcu();
834874 	__netpoll_cleanup(np);
835
-	rtnl_unlock();
836875 	kfree(np);
837876 }
838
-
839
-void __netpoll_free_async(struct netpoll *np)
840
-{
841
-	schedule_work(&np->cleanup_work);
842
-}
843
-EXPORT_SYMBOL_GPL(__netpoll_free_async);
877
+EXPORT_SYMBOL_GPL(__netpoll_free);
844878 
845879 void netpoll_cleanup(struct netpoll *np)
846880 {