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Date: Wed, 19 Mar 2014 16:33:52 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, nhorman@...driver.com, andy@...yhouse.net,
tgraf@...g.ch, dborkman@...hat.com, ogerlitz@...lanox.com,
jesse@...ira.com, pshelar@...ira.com, azhou@...ira.com,
ben@...adent.org.uk, stephen@...workplumber.org,
jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
edumazet@...gle.com
Subject: [patch net-next RFC 4/4] net: introduce dummy switch
Dummy switch implementation using switchdev API
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
drivers/net/Kconfig | 7 +++
drivers/net/Makefile | 1 +
drivers/net/dummyswitch.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 150 insertions(+)
create mode 100644 drivers/net/dummyswitch.c
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 89402c3..a9629a7 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -71,6 +71,13 @@ config DUMMY
To compile this driver as a module, choose M here: the module
will be called dummy.
+config NET_DUMMY_SWITCH
+ tristate "Dummy switch net driver support"
+ depends on NET_SWITCHDEV
+ ---help---
+ To compile this driver as a module, choose M here: the module
+ will be called dummyswitch.
+
config EQUALIZER
tristate "EQL (serial line load balancing) support"
---help---
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 3fef8a8..d5d4ce6 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -7,6 +7,7 @@
#
obj-$(CONFIG_BONDING) += bonding/
obj-$(CONFIG_DUMMY) += dummy.o
+obj-$(CONFIG_NET_DUMMY_SWITCH) += dummyswitch.o
obj-$(CONFIG_EQUALIZER) += eql.o
obj-$(CONFIG_IFB) += ifb.o
obj-$(CONFIG_MACVLAN) += macvlan.o
diff --git a/drivers/net/dummyswitch.c b/drivers/net/dummyswitch.c
new file mode 100644
index 0000000..8c315cb6
--- /dev/null
+++ b/drivers/net/dummyswitch.c
@@ -0,0 +1,142 @@
+/*
+ * drivers/net/dummyswitch.c - Dummy switch device
+ * Copyright (c) 2014 Jiri Pirko <jiri@...nulli.us>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/switchdev.h>
+
+#include <net/rtnetlink.h>
+
+static int numswitches = 1;
+static int numports = 8;
+
+module_param(numswitches, int, 1);
+MODULE_PARM_DESC(numswitches, "Number of dummy switch pseudo devices");
+module_param(numports, int, 8);
+MODULE_PARM_DESC(numports, "Number of ports per dummy switch pseudo device");
+
+static const struct swdev_ops dummysw_swdev_ops = {
+ .kind = "dummyswitch",
+};
+
+static netdev_tx_t dummyswport_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+
+static const struct swportdev_ops dummysw_swportdev_ops = {
+ .kind = "dummyswitchport",
+ .skb_xmit = dummyswport_xmit,
+};
+
+static struct net_device **dummyswdevs;
+
+static void dummysw_exit_ports(struct net_device *dev)
+{
+ struct net_device *tmp;
+
+ for_each_netdev(dev_net(dev), tmp) {
+ if (netdev_master_upper_dev_get(tmp) == dev)
+ swportdev_destroy(tmp);
+ }
+}
+
+static int dummysw_init_ports(struct net_device *dev)
+{
+ struct net_device *tmp;
+ int err;
+ int i;
+
+ for (i = 0; i < numports; i++) {
+ tmp = swportdev_create(dev, &dummysw_swportdev_ops);
+ if (IS_ERR(tmp)) {
+ err = PTR_ERR(tmp);
+ goto exit_ports;
+ }
+ }
+ return 0;
+
+exit_ports:
+ dummysw_exit_ports(dev);
+ return err;
+}
+
+static void dummysw_exit_one(struct net_device **pdev)
+{
+ dummysw_exit_ports(*pdev);
+ swdev_destroy(*pdev);
+}
+
+static int dummysw_init_one(struct net_device **pdev)
+{
+ struct net_device *dev;
+ int err;
+
+ dev = swdev_create(&dummysw_swdev_ops);
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+ err = dummysw_init_ports(dev);
+ if (err)
+ goto swdev_destroy;
+ *pdev = dev;
+ return 0;
+
+swdev_destroy:
+ swdev_destroy(dev);
+ return err;
+}
+
+static int __init dummysw_module_init(void)
+{
+ int err;
+ int i;
+
+ dummyswdevs = kmalloc(sizeof(struct net_device) * numswitches,
+ GFP_KERNEL);
+ if (!dummyswdevs)
+ return -ENOMEM;
+
+ rtnl_lock();
+ for (i = 0; i < numswitches; i++) {
+ err = dummysw_init_one(&dummyswdevs[i]);
+ if (err)
+ goto rollback;
+ }
+ rtnl_unlock();
+ return 0;
+
+rollback:
+ for (i--; i >= 0; i--)
+ dummysw_exit_one(&dummyswdevs[i]);
+ rtnl_unlock();
+ kfree(dummyswdevs);
+ return err;
+}
+
+static void __exit dummysw_module_exit(void)
+{
+ int i;
+
+ rtnl_lock();
+ for (i = 0; i < numswitches; i++)
+ dummysw_exit_one(&dummyswdevs[i]);
+ rtnl_unlock();
+ kfree(dummyswdevs);
+}
+
+module_init(dummysw_module_init);
+module_exit(dummysw_module_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Jiri Pirko <jiri@...nulli.us>");
+MODULE_DESCRIPTION("Dummy switch device");
--
1.8.5.3
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