linux-kernel - [RFC V2 PATCH 14/25] net/netpolicy: handle channel changes

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Message-Id: <1470339389-8542-15-git-send-email-kan.liang@intel.com>
Date:	Thu,  4 Aug 2016 15:36:18 -0400
From:	kan.liang@...el.com
To:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Cc:	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 14/25] net/netpolicy: handle channel changes

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

User can uses ethtool to set the channel number. This patch handles the
channel changes by rebuilding the object list.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 include/linux/netpolicy.h | 8 ++++++++
 net/core/ethtool.c        | 8 +++++++-
 net/core/netpolicy.c      | 1 +
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/include/linux/netpolicy.h b/include/linux/netpolicy.h
index 579ff98..cc75e3c 100644
--- a/include/linux/netpolicy.h
+++ b/include/linux/netpolicy.h
@@ -79,4 +79,12 @@ struct netpolicy_info {
 	struct list_head		obj_list[NETPOLICY_RXTX][NET_POLICY_MAX];
 };
 
+#ifdef CONFIG_NETPOLICY
+extern void update_netpolicy_sys_map(void);
+#else
+static inline void update_netpolicy_sys_map(void)
+{
+}
+#endif
+
 #endif /*__LINUX_NETPOLICY_H*/
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 9774898..e1f8bd0 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1703,6 +1703,7 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
 {
 	struct ethtool_channels channels, max;
 	u32 max_rx_in_use = 0;
+	int ret;
 
 	if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
 		return -EOPNOTSUPP;
@@ -1726,7 +1727,12 @@ static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
 	    (channels.combined_count + channels.rx_count) <= max_rx_in_use)
 	    return -EINVAL;
 
-	return dev->ethtool_ops->set_channels(dev, &channels);
+	ret = dev->ethtool_ops->set_channels(dev, &channels);
+#ifdef CONFIG_NETPOLICY
+	if (!ret)
+		update_netpolicy_sys_map();
+#endif
+	return ret;
 }
 
 static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
diff --git a/net/core/netpolicy.c b/net/core/netpolicy.c
index 3b523fc..7579685 100644
--- a/net/core/netpolicy.c
+++ b/net/core/netpolicy.c
@@ -885,6 +885,7 @@ unlock:
 		}
 	}
 }
+EXPORT_SYMBOL(update_netpolicy_sys_map);
 
 static int netpolicy_cpu_callback(struct notifier_block *nfb,
 				  unsigned long action, void *hcpu)
-- 
2.5.5