linux-kernel - [RFC V2 PATCH 07/25] net/netpolicy: enable and disable NET policy

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Message-Id: <1420076354-4861-8-git-send-email-kan.liang@intel.com>
Date:	Wed, 31 Dec 2014 20:38:56 -0500
From:	kan.liang@...el.com
To:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Cc:	jeffrey.t.kirsher@...el.com, mingo@...hat.com,
	peterz@...radead.org, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	akpm@...ux-foundation.org, keescook@...omium.org,
	viro@...iv.linux.org.uk, gorcunov@...nvz.org,
	john.stultz@...aro.org, aduyck@...antis.com, ben@...adent.org.uk,
	decot@...glers.com, fw@...len.de, alexander.duyck@...il.com,
	daniel@...earbox.net, tom@...bertland.com, rdunlap@...radead.org,
	xiyou.wangcong@...il.com, hannes@...essinduktion.org,
	jesse.brandeburg@...el.com, andi@...stfloor.org,
	Kan Liang <kan.liang@...el.com>
Subject: [RFC V2 PATCH 07/25] net/netpolicy: enable and disable NET policy

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

This patch introduces functions to enable and disable NET policy.

For enabling, it collects device and CPU information, setup CPU/queue
mapping, and set IRQ affinity accordingly.

For disabling, it removes the IRQ affinity and mapping information.

np_lock should protect the enable and disable state. It will be done
later in this series.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 net/core/netpolicy.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/net/core/netpolicy.c b/net/core/netpolicy.c
index c44818d..7d4a49d 100644
--- a/net/core/netpolicy.c
+++ b/net/core/netpolicy.c
@@ -161,6 +161,45 @@ static void netpolicy_set_affinity(struct net_device *dev)
 	}
 }
 
+static int netpolicy_disable(struct net_device *dev)
+{
+	netpolicy_clear_affinity(dev);
+	netpolicy_free_sys_map(dev);
+
+	return 0;
+}
+
+static int netpolicy_enable(struct net_device *dev)
+{
+	int ret;
+	struct netpolicy_dev_info d_info;
+	u32 cpu;
+
+	if (WARN_ON(!dev->netpolicy))
+		return -EINVAL;
+
+	/* get driver information */
+	ret = netpolicy_get_dev_info(dev, &d_info);
+	if (ret)
+		return ret;
+
+	/* get cpu information */
+	cpu = netpolicy_get_cpu_information();
+
+	/* create sys map */
+	ret = netpolicy_update_sys_map(dev, &d_info, cpu);
+	if (ret) {
+		netpolicy_free_dev_info(&d_info);
+		return ret;
+	}
+
+	/* set irq affinity */
+	netpolicy_set_affinity(dev);
+
+	netpolicy_free_dev_info(&d_info);
+	return 0;
+}
+
 const char *policy_name[NET_POLICY_MAX] = {
 	"NONE"
 };
-- 
2.5.5