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Date: Sat, 20 Sep 2014 09:37:23 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: netdev@...r.kernel.org, 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, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
roopa@...ulusnetworks.com, linville@...driver.com,
dev@...nvswitch.org, jasowang@...hat.com, ebiederm@...ssion.com,
nicolas.dichtel@...nd.com, ryazanov.s.a@...il.com,
buytenh@...tstofly.org, aviadr@...lanox.com, nbd@...nwrt.org,
alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
ronye@...lanox.com, simon.horman@...ronome.com,
alexander.h.duyck@...el.com
Subject: Re: [patch net-next v2 5/9] net: introduce dummy switch
Sat, Sep 20, 2014 at 07:21:00AM CEST, f.fainelli@...il.com wrote:
>On 09/19/14 06:49, Jiri Pirko wrote:
>>Dummy switch implementation using switchdev interface
>
>This really looks like a DSA driver that has 0 ports, and is not attached to
>an useful network interface, and which is registering its own set of rtnl
>operations for a purpose that is unclear to me.
>
>I think registering these rtnl ops is misleading as it leads to a false idea
>that this is allowed, and that people are actually encouraged to do that for
>custom switch drivers, and this completely defeats the purpose of coming up
>with a generic API.
>
>If we are to go that route anyway, I really prefer the way Felix did it in
>swconfig, and the fake switch driver did do something useful being attached
>to the loopback interface:
>
>http://lists.openwall.net/netdev/2013/10/22/103
>http://patchwork.ozlabs.org/patch/285478/
I will drop dummyswitch because it serves primary as an example. But
since rocker is here, this is no longer needed.
>
>>
>>Signed-off-by: Jiri Pirko <jiri@...nulli.us>
>>---
>> drivers/net/Kconfig | 7 +++
>> drivers/net/Makefile | 1 +
>> drivers/net/dummyswitch.c | 130 +++++++++++++++++++++++++++++++++++++++++++
>> include/uapi/linux/if_link.h | 9 +++
>> 4 files changed, 147 insertions(+)
>> create mode 100644 drivers/net/dummyswitch.c
>>
>>diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
>>index c6f6f69..7822c74 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 61aefdd..3c835ba 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..e7a48f4
>>--- /dev/null
>>+++ b/drivers/net/dummyswitch.c
>>@@ -0,0 +1,130 @@
>>+/*
>>+ * 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/netdevice.h>
>>+#include <linux/etherdevice.h>
>>+#include <net/rtnetlink.h>
>>+
>>+struct dummyswport_priv {
>>+ struct netdev_phys_item_id psid;
>>+};
>>+
>>+static netdev_tx_t dummyswport_start_xmit(struct sk_buff *skb,
>>+ struct net_device *dev)
>>+{
>>+ dev_kfree_skb(skb);
>>+ return NETDEV_TX_OK;
>>+}
>>+
>>+static int dummyswport_swdev_id_get(struct net_device *dev,
>>+ struct netdev_phys_item_id *psid)
>>+{
>>+ struct dummyswport_priv *dsp = netdev_priv(dev);
>>+
>>+ memcpy(psid, &dsp->psid, sizeof(*psid));
>>+ return 0;
>>+}
>>+
>>+static int dummyswport_change_carrier(struct net_device *dev, bool new_carrier)
>>+{
>>+ if (new_carrier)
>>+ netif_carrier_on(dev);
>>+ else
>>+ netif_carrier_off(dev);
>>+ return 0;
>>+}
>>+
>>+static const struct net_device_ops dummyswport_netdev_ops = {
>>+ .ndo_start_xmit = dummyswport_start_xmit,
>>+ .ndo_swdev_id_get = dummyswport_swdev_id_get,
>>+ .ndo_change_carrier = dummyswport_change_carrier,
>>+};
>>+
>>+static void dummyswport_setup(struct net_device *dev)
>>+{
>>+ ether_setup(dev);
>>+
>>+ /* Initialize the device structure. */
>>+ dev->netdev_ops = &dummyswport_netdev_ops;
>>+ dev->destructor = free_netdev;
>>+
>>+ /* Fill in device structure with ethernet-generic values. */
>>+ dev->tx_queue_len = 0;
>>+ dev->flags |= IFF_NOARP;
>>+ dev->flags &= ~IFF_MULTICAST;
>>+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
>>+ dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_TSO;
>>+ dev->features |= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
>>+ eth_hw_addr_random(dev);
>>+}
>>+
>>+static int dummyswport_validate(struct nlattr *tb[], struct nlattr *data[])
>>+{
>>+ if (tb[IFLA_ADDRESS])
>>+ return -EINVAL;
>>+ if (!data || !data[IFLA_DUMMYSWPORT_PHYS_SWITCH_ID])
>>+ return -EINVAL;
>>+ return 0;
>>+}
>>+
>>+static int dummyswport_newlink(struct net *src_net, struct net_device *dev,
>>+ struct nlattr *tb[], struct nlattr *data[])
>>+{
>>+ struct dummyswport_priv *dsp = netdev_priv(dev);
>>+ int err;
>>+
>>+ dsp->psid.id_len = nla_len(data[IFLA_DUMMYSWPORT_PHYS_SWITCH_ID]);
>>+ memcpy(dsp->psid.id, nla_data(data[IFLA_DUMMYSWPORT_PHYS_SWITCH_ID]),
>>+ dsp->psid.id_len);
>>+
>>+ err = register_netdevice(dev);
>>+ if (err)
>>+ return err;
>>+
>>+ netif_carrier_on(dev);
>>+
>>+ return 0;
>>+}
>>+
>>+static const struct nla_policy dummyswport_policy[IFLA_DUMMYSWPORT_MAX + 1] = {
>>+ [IFLA_DUMMYSWPORT_PHYS_SWITCH_ID] = { .type = NLA_BINARY,
>>+ .len = MAX_PHYS_ITEM_ID_LEN },
>>+};
>>+
>>+static struct rtnl_link_ops dummyswport_link_ops __read_mostly = {
>>+ .kind = "dummyswport",
>>+ .priv_size = sizeof(struct dummyswport_priv),
>>+ .setup = dummyswport_setup,
>>+ .validate = dummyswport_validate,
>>+ .newlink = dummyswport_newlink,
>>+ .policy = dummyswport_policy,
>>+ .maxtype = IFLA_DUMMYSWPORT_MAX,
>>+};
>>+
>>+static int __init dummysw_module_init(void)
>>+{
>>+ return rtnl_link_register(&dummyswport_link_ops);
>>+}
>>+
>>+static void __exit dummysw_module_exit(void)
>>+{
>>+ rtnl_link_unregister(&dummyswport_link_ops);
>>+}
>>+
>>+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");
>>+MODULE_ALIAS_RTNL_LINK("dummyswport");
>>diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>>index c5ca3b9..bd24d69 100644
>>--- a/include/uapi/linux/if_link.h
>>+++ b/include/uapi/linux/if_link.h
>>@@ -574,4 +574,13 @@ enum {
>>
>> #define IFLA_HSR_MAX (__IFLA_HSR_MAX - 1)
>>
>>+/* DUMMYSWPORT section */
>>+enum {
>>+ IFLA_DUMMYSWPORT_UNSPEC,
>>+ IFLA_DUMMYSWPORT_PHYS_SWITCH_ID,
>>+ __IFLA_DUMMYSWPORT_MAX,
>>+};
>>+
>>+#define IFLA_DUMMYSWPORT_MAX (__IFLA_DUMMYSWPORT_MAX - 1)
>>+
>> #endif /* _UAPI_LINUX_IF_LINK_H */
>>
>
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