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From: kan.liang@intel.com
To: davem@davemloft.net, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org
Cc: jeffrey.t.kirsher@intel.com, mingo@redhat.com,
	peterz@infradead.org, kuznet@ms2.inr.ac.ru, jmorris@namei.org,
	yoshfuji@linux-ipv6.org, kaber@trash.net,
	akpm@linux-foundation.org, keescook@chromium.org,
	viro@zeniv.linux.org.uk, gorcunov@openvz.org,
	john.stultz@linaro.org, aduyck@mirantis.com, ben@decadent.org.uk,
	decot@googlers.com, fw@strlen.de, alexander.duyck@gmail.com,
	daniel@iogearbox.net, tom@herbertland.com, rdunlap@infradead.org,
	xiyou.wangcong@gmail.com, hannes@stressinduktion.org,
	stephen@networkplumber.org, alexei.starovoitov@gmail.com,
	jesse.brandeburg@intel.com, andi@firstfloor.org,
	Kan Liang <kan.liang@intel.com>
Subject: [RFC V3 PATCH 13/26] net/netpolicy: support CPU hotplug
Date: Mon, 12 Sep 2016 07:55:46 -0700	[thread overview]
Message-ID: <1473692159-4017-14-git-send-email-kan.liang@intel.com> (raw)
In-Reply-To: <1473692159-4017-1-git-send-email-kan.liang@intel.com>

From: Kan Liang <kan.liang@intel.com>

For CPU hotplug, the NET policy subsystem will rebuild the sys map and
object list.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
 net/core/netpolicy.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/net/core/netpolicy.c b/net/core/netpolicy.c
index 271ecc3..3bf0a44 100644
--- a/net/core/netpolicy.c
+++ b/net/core/netpolicy.c
@@ -38,6 +38,7 @@
 #include <net/rtnetlink.h>
 #include <linux/sort.h>
 #include <linux/ctype.h>
+#include <linux/cpu.h>
 
 static int netpolicy_get_dev_info(struct net_device *dev,
 				  struct netpolicy_dev_info *d_info)
@@ -846,6 +847,77 @@ static struct notifier_block netpolicy_dev_notf = {
 	.notifier_call = netpolicy_notify,
 };
 
+/**
+ * update_netpolicy_sys_map() - rebuild the sys map and object list
+ *
+ * This function go through all the available net policy supported device,
+ * and rebuild sys map and object list.
+ *
+ */
+void update_netpolicy_sys_map(void)
+{
+	struct net *net;
+	struct net_device *dev, *aux;
+	enum netpolicy_name cur_policy;
+
+	for_each_net(net) {
+		for_each_netdev_safe(net, dev, aux) {
+			spin_lock(&dev->np_lock);
+			if (!dev->netpolicy)
+				goto unlock;
+			cur_policy = dev->netpolicy->cur_policy;
+			if (cur_policy == NET_POLICY_NONE)
+				goto unlock;
+
+			dev->netpolicy->cur_policy = NET_POLICY_NONE;
+
+			/* rebuild everything */
+			netpolicy_disable(dev);
+			netpolicy_enable(dev);
+			if (netpolicy_gen_obj_list(dev, cur_policy)) {
+				pr_warn("NETPOLICY: Failed to generate netpolicy object list for dev %s\n",
+					dev->name);
+				netpolicy_disable(dev);
+				goto unlock;
+			}
+			if (dev->netdev_ops->ndo_set_net_policy(dev, cur_policy)) {
+				pr_warn("NETPOLICY: Failed to set netpolicy for dev %s\n",
+					dev->name);
+				netpolicy_disable(dev);
+				goto unlock;
+			}
+
+			dev->netpolicy->cur_policy = cur_policy;
+unlock:
+			spin_unlock(&dev->np_lock);
+		}
+	}
+}
+
+static int netpolicy_cpu_callback(struct notifier_block *nfb,
+				  unsigned long action, void *hcpu)
+{
+	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_ONLINE:
+		rtnl_lock();
+		update_netpolicy_sys_map();
+		rtnl_unlock();
+		break;
+	case CPU_DYING:
+		rtnl_lock();
+		update_netpolicy_sys_map();
+		rtnl_unlock();
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block netpolicy_cpu_notifier = {
+	&netpolicy_cpu_callback,
+	NULL,
+	0
+};
+
 static int __init netpolicy_init(void)
 {
 	int ret;
@@ -854,6 +926,10 @@ static int __init netpolicy_init(void)
 	if (!ret)
 		register_netdevice_notifier(&netpolicy_dev_notf);
 
+	cpu_notifier_register_begin();
+	__register_cpu_notifier(&netpolicy_cpu_notifier);
+	cpu_notifier_register_done();
+
 	return ret;
 }
 
@@ -861,6 +937,10 @@ static void __exit netpolicy_exit(void)
 {
 	unregister_netdevice_notifier(&netpolicy_dev_notf);
 	unregister_pernet_subsys(&netpolicy_net_ops);
+
+	cpu_notifier_register_begin();
+	__unregister_cpu_notifier(&netpolicy_cpu_notifier);
+	cpu_notifier_register_done();
 }
 
 subsys_initcall(netpolicy_init);
-- 
2.5.5

  parent reply	other threads:[~2016-09-12 15:03 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-12 14:55 [RFC V3 PATCH 00/26] Kernel NET policy kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 01/26] net: introduce " kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 02/26] net/netpolicy: init " kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 03/26] net/netpolicy: get device queue irq information kan.liang
2016-09-12 16:48   ` Sergei Shtylyov
2016-09-13 12:23     ` Liang, Kan
2016-09-13 12:23       ` Liang, Kan
2016-09-13 13:14       ` Alexander Duyck
2016-09-13 13:14         ` Alexander Duyck
2016-09-13 13:22         ` Liang, Kan
2016-09-13 13:22           ` Liang, Kan
2016-09-12 14:55 ` [RFC V3 PATCH 04/26] net/netpolicy: get CPU information kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 05/26] net/netpolicy: create CPU and queue mapping kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 06/26] net/netpolicy: set and remove IRQ affinity kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 07/26] net/netpolicy: enable and disable NET policy kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 08/26] net/netpolicy: introduce NET policy object kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 09/26] net/netpolicy: set NET policy by policy name kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 10/26] net/netpolicy: add three new NET policies kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 11/26] net/netpolicy: add MIX policy kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 12/26] net/netpolicy: NET device hotplug kan.liang
2016-09-12 14:55 ` kan.liang [this message]
2016-09-12 14:55 ` [RFC V3 PATCH 14/26] net/netpolicy: handle channel changes kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 15/26] net/netpolicy: implement netpolicy register kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 16/26] net/netpolicy: introduce per socket netpolicy kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 17/26] net/netpolicy: introduce netpolicy_pick_queue kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 18/26] net/netpolicy: set tx queues according to policy kan.liang
2016-09-12 20:23   ` Tom Herbert
2016-09-12 20:23     ` Tom Herbert
2016-09-13 12:22     ` Liang, Kan
2016-09-13 12:22       ` Liang, Kan
2016-09-12 14:55 ` [RFC V3 PATCH 19/26] net/netpolicy: tc bpf extension to pick Tx queue kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 20/26] net/netpolicy: set Rx queues according to policy kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 21/26] net/netpolicy: introduce per task net policy kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 22/26] net/netpolicy: set per task policy by proc kan.liang
2016-09-12 17:01   ` Sergei Shtylyov
2016-09-12 14:55 ` [RFC V3 PATCH 23/26] net/netpolicy: fast path for finding the queues kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 24/26] net/netpolicy: optimize for queue pair kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 25/26] net/netpolicy: limit the total record number kan.liang
2016-09-12 14:55 ` [RFC V3 PATCH 26/26] Documentation/networking: Document NET policy kan.liang
2016-09-12 15:38 ` [RFC V3 PATCH 00/26] Kernel " Florian Westphal
2016-09-12 17:21   ` Cong Wang
2016-09-12 17:21     ` Cong Wang
2016-09-12 15:52 ` Eric Dumazet
2016-09-19 20:39   ` Stephen Hemminger

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