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Subject[RFC V2 PATCH 01/25] net: introduce NET policy
Date
From: Kan Liang <kan.liang@intel.com>

This patch introduce NET policy subsystem. If proc is supported in the
system, it creates netpolicy node in proc system.

Signed-off-by: Kan Liang <kan.liang@intel.com>
---
include/linux/netdevice.h | 7 +++
include/net/net_namespace.h | 3 ++
net/Kconfig | 7 +++
net/core/Makefile | 1 +
net/core/netpolicy.c | 128 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 146 insertions(+)
create mode 100644 net/core/netpolicy.c

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 076df53..19638d6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1619,6 +1619,8 @@ enum netdev_priv_flags {
* switch driver and used to set the phys state of the
* switch port.
*
+ * @proc_dev: device node in proc to configure device net policy
+ *
* FIXME: cleanup struct net_device such that network protocol info
* moves out.
*/
@@ -1886,6 +1888,11 @@ struct net_device {
struct lock_class_key *qdisc_tx_busylock;
struct lock_class_key *qdisc_running_key;
bool proto_down;
+#ifdef CONFIG_NETPOLICY
+#ifdef CONFIG_PROC_FS
+ struct proc_dir_entry *proc_dev;
+#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_NETPOLICY */
};
#define to_net_dev(d) container_of(d, struct net_device, dev)

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 4089abc..d2ff6c4 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -142,6 +142,9 @@ struct net {
#endif
struct sock *diag_nlsk;
atomic_t fnhe_genid;
+#ifdef CONFIG_NETPOLICY
+ struct proc_dir_entry *proc_netpolicy;
+#endif /* CONFIG_NETPOLICY */
};

#include <linux/seq_file_net.h>
diff --git a/net/Kconfig b/net/Kconfig
index c2cdbce..00552ba 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -205,6 +205,13 @@ source "net/bridge/netfilter/Kconfig"

endif

+config NETPOLICY
+ depends on NET
+ bool "Net policy support"
+ default y
+ ---help---
+ Net policy support
+
source "net/dccp/Kconfig"
source "net/sctp/Kconfig"
source "net/rds/Kconfig"
diff --git a/net/core/Makefile b/net/core/Makefile
index d6508c2..0be7092 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -27,3 +27,4 @@ obj-$(CONFIG_LWTUNNEL) += lwtunnel.o
obj-$(CONFIG_DST_CACHE) += dst_cache.o
obj-$(CONFIG_HWBM) += hwbm.o
obj-$(CONFIG_NET_DEVLINK) += devlink.o
+obj-$(CONFIG_NETPOLICY) += netpolicy.o
diff --git a/net/core/netpolicy.c b/net/core/netpolicy.c
new file mode 100644
index 0000000..faabfe7
--- /dev/null
+++ b/net/core/netpolicy.c
@@ -0,0 +1,128 @@
+/*
+ * netpolicy.c: Net policy support
+ * Copyright (c) 2016, Intel Corporation.
+ * Author: Kan Liang (kan.liang@intel.com)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * NET policy intends to simplify the network configuration and get a good
+ * network performance according to the hints(policy) which is applied by user.
+ *
+ * Motivation
+ * - The network performance is not good with default system settings.
+ * - It is too difficult to do automatic tuning for all possible
+ * workloads, since workloads have different requirements. Some
+ * workloads may want high throughput. Some may need low latency.
+ * - There are lots of manual configurations. Fine grained configuration
+ * is too difficult for users.
+ * So, it is a big challenge to get good network performance.
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include <linux/netdevice.h>
+#include <net/net_namespace.h>
+
+#ifdef CONFIG_PROC_FS
+
+static int net_policy_proc_show(struct seq_file *m, void *v)
+{
+ struct net_device *dev = (struct net_device *)m->private;
+
+ seq_printf(m, "%s doesn't support net policy manager\n", dev->name);
+
+ return 0;
+}
+
+static int net_policy_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, net_policy_proc_show, PDE_DATA(inode));
+}
+
+static const struct file_operations proc_net_policy_operations = {
+ .open = net_policy_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+ .owner = THIS_MODULE,
+};
+
+static int netpolicy_proc_dev_init(struct net *net, struct net_device *dev)
+{
+ dev->proc_dev = proc_net_mkdir(net, dev->name, net->proc_netpolicy);
+ if (!dev->proc_dev)
+ return -ENOMEM;
+
+ if (!proc_create_data("policy", S_IWUSR | S_IRUGO,
+ dev->proc_dev, &proc_net_policy_operations,
+ (void *)dev)) {
+ remove_proc_subtree(dev->name, net->proc_netpolicy);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static int __net_init netpolicy_net_init(struct net *net)
+{
+ struct net_device *dev, *aux;
+
+ net->proc_netpolicy = proc_net_mkdir(net, "netpolicy",
+ net->proc_net);
+ if (!net->proc_netpolicy)
+ return -ENOMEM;
+
+ for_each_netdev_safe(net, dev, aux) {
+ netpolicy_proc_dev_init(net, dev);
+ }
+
+ return 0;
+}
+
+#else /* CONFIG_PROC_FS */
+
+static int __net_init netpolicy_net_init(struct net *net)
+{
+ return 0;
+}
+#endif /* CONFIG_PROC_FS */
+
+static void __net_exit netpolicy_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_subtree("netpolicy", net->proc_net);
+#endif /* CONFIG_PROC_FS */
+}
+
+static struct pernet_operations netpolicy_net_ops = {
+ .init = netpolicy_net_init,
+ .exit = netpolicy_net_exit,
+};
+
+static int __init netpolicy_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&netpolicy_net_ops);
+
+ return ret;
+}
+
+static void __exit netpolicy_exit(void)
+{
+ unregister_pernet_subsys(&netpolicy_net_ops);
+}
+
+subsys_initcall(netpolicy_init);
+module_exit(netpolicy_exit);
--
2.5.5
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