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Date: Fri, 19 Sep 2014 15:49:43 +0200
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, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
f.fainelli@...il.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: [patch net-next v2 2/9] net: introduce generic switch devices support
The goal of this is to provide a possibility to suport various switch
chips. Drivers should implement relevant ndos to do so. Now there is
only one ndo defined:
- for getting physical switch id is in place.
Note that user can use random port netdevice to access the switch.
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
Documentation/networking/switchdev.txt | 53 ++++++++++++++++++++++++++++++++++
MAINTAINERS | 7 +++++
include/linux/netdevice.h | 12 ++++++++
include/net/switchdev.h | 29 +++++++++++++++++++
net/Kconfig | 1 +
net/Makefile | 3 ++
net/switchdev/Kconfig | 9 ++++++
net/switchdev/Makefile | 5 ++++
net/switchdev/switchdev.c | 32 ++++++++++++++++++++
9 files changed, 151 insertions(+)
create mode 100644 Documentation/networking/switchdev.txt
create mode 100644 include/net/switchdev.h
create mode 100644 net/switchdev/Kconfig
create mode 100644 net/switchdev/Makefile
create mode 100644 net/switchdev/switchdev.c
diff --git a/Documentation/networking/switchdev.txt b/Documentation/networking/switchdev.txt
new file mode 100644
index 0000000..435746a
--- /dev/null
+++ b/Documentation/networking/switchdev.txt
@@ -0,0 +1,53 @@
+Switch device drivers HOWTO
+===========================
+
+First lets describe a topology a bit. Imagine the following example:
+
+ +----------------------------+ +---------------+
+ | SOME switch chip | | CPU |
+ +----------------------------+ +---------------+
+ port1 port2 port3 port4 MNGMNT | PCI-E |
+ | | | | | +---------------+
+ PHY PHY | | | | NIC0 NIC1
+ | | | | | |
+ | | +- PCI-E -+ | |
+ | +------- MII -------+ |
+ +------------- MII ------------+
+
+In this example, there are two independent lines between the switch silicon
+and CPU. NIC0 and NIC1 drivers are not aware of a switch presence. They are
+separate from the switch driver. SOME switch chip is by managed by a driver
+via PCI-E device MNGMNT. Note that MNGMNT device, NIC0 and NIC1 may be
+connected to some other type of bus.
+
+Now, for the previous example show the representation in kernel:
+
+ +----------------------------+ +---------------+
+ | SOME switch chip | | CPU |
+ +----------------------------+ +---------------+
+ sw0p0 sw0p1 sw0p2 sw0p3 MNGMNT | PCI-E |
+ | | | | | +---------------+
+ PHY PHY | | | | eth0 eth1
+ | | | | | |
+ | | +- PCI-E -+ | |
+ | +------- MII -------+ |
+ +------------- MII ------------+
+
+Lets call the example switch driver for SOME switch chip "SOMEswitch". This
+driver takes care of PCI-E device MNGMNT. There is a netdevice instance sw0pX
+created for each port of a switch. These netdevices are instances
+of "SOMEswitch" driver. sw0pX netdevices serve as a "representation"
+of the switch chip. eth0 and eth1 are instances of some other existing driver.
+
+The only difference of the switch-port netdevice from the ordinary netdevice
+is that is implements couple more NDOs:
+
+ ndo_swdev_get_id - This returns the same ID for two port netdevices of
+ the same physical switch chip. This is mandatory to
+ be implemented by all switch drivers and serves
+ the caller for recognition of a port netdevice.
+ ndo_swdev_* - Functions that serve for a manipulation of the switch chip
+ itself. They are not port-specific. Caller might use
+ arbitrary port netdevice of the same switch and it will
+ make no difference.
+ ndo_swportdev_* - Functions that serve for a port-specific manipulation.
diff --git a/MAINTAINERS b/MAINTAINERS
index 5e3709e..f1f26db 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8826,6 +8826,13 @@ F: lib/swiotlb.c
F: arch/*/kernel/pci-swiotlb.c
F: include/linux/swiotlb.h
+SWITCHDEV
+M: Jiri Pirko <jiri@...nulli.us>
+L: netdev@...r.kernel.org
+S: Supported
+F: net/switchdev/
+F: include/net/switchdev.h
+
SYNOPSYS ARC ARCHITECTURE
M: Vineet Gupta <vgupta@...opsys.com>
S: Supported
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 13d765f..b290dcf 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -752,6 +752,8 @@ struct netdev_phys_item_id {
typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
struct sk_buff *skb);
+#include <net/switchdev.h>
+
/*
* This structure defines the management hooks for network devices.
* The following hooks can be defined; unless noted otherwise, they are
@@ -997,6 +999,12 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
* Callback to use for xmit over the accelerated station. This
* is used in place of ndo_start_xmit on accelerated net
* devices.
+ *
+ * int (*ndo_swdev_id_get)(struct net_device *dev,
+ * struct netdev_phys_item_id *psid);
+ * Called to get an ID of the switch chip this port is part of.
+ * If driver implements this, it indicates that it represents a port
+ * of a switch chip.
*/
struct net_device_ops {
int (*ndo_init)(struct net_device *dev);
@@ -1146,6 +1154,10 @@ struct net_device_ops {
struct net_device *dev,
void *priv);
int (*ndo_get_lock_subclass)(struct net_device *dev);
+#ifdef CONFIG_NET_SWITCHDEV
+ int (*ndo_swdev_id_get)(struct net_device *dev,
+ struct netdev_phys_item_id *psid);
+#endif
};
/**
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
new file mode 100644
index 0000000..af30f75
--- /dev/null
+++ b/include/net/switchdev.h
@@ -0,0 +1,29 @@
+/*
+ * include/net/switchdev.h - Switch device API
+ * 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.
+ */
+#ifndef _LINUX_SWITCHDEV_H_
+#define _LINUX_SWITCHDEV_H_
+
+#include <linux/netdevice.h>
+
+#ifdef CONFIG_NET_SWITCHDEV
+
+int swdev_id_get(struct net_device *dev, struct netdev_phys_item_id *psid);
+
+#else
+
+static inline int swdev_id_get(struct net_device *dev,
+ struct netdev_phys_item_id *psid)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif
+
+#endif /* _LINUX_SWITCHDEV_H_ */
diff --git a/net/Kconfig b/net/Kconfig
index 4051fdf..89a7fec 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -226,6 +226,7 @@ source "net/vmw_vsock/Kconfig"
source "net/netlink/Kconfig"
source "net/mpls/Kconfig"
source "net/hsr/Kconfig"
+source "net/switchdev/Kconfig"
config RPS
boolean
diff --git a/net/Makefile b/net/Makefile
index 7ed1970..95fc694 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -73,3 +73,6 @@ obj-$(CONFIG_OPENVSWITCH) += openvswitch/
obj-$(CONFIG_VSOCKETS) += vmw_vsock/
obj-$(CONFIG_NET_MPLS_GSO) += mpls/
obj-$(CONFIG_HSR) += hsr/
+ifneq ($(CONFIG_NET_SWITCHDEV),)
+obj-y += switchdev/
+endif
diff --git a/net/switchdev/Kconfig b/net/switchdev/Kconfig
new file mode 100644
index 0000000..20e8ed2
--- /dev/null
+++ b/net/switchdev/Kconfig
@@ -0,0 +1,9 @@
+#
+# Configuration for Switch device support
+#
+
+config NET_SWITCHDEV
+ boolean "Switch device support (EXPERIMENTAL)"
+ depends on INET
+ ---help---
+ This module provides support for hardware switch chips.
diff --git a/net/switchdev/Makefile b/net/switchdev/Makefile
new file mode 100644
index 0000000..5ed63ed
--- /dev/null
+++ b/net/switchdev/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the Switch device API
+#
+
+obj-$(CONFIG_NET_SWITCHDEV) += switchdev.o
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
new file mode 100644
index 0000000..14a5fc9
--- /dev/null
+++ b/net/switchdev/switchdev.c
@@ -0,0 +1,32 @@
+/*
+ * net/switchdev/switchdev.c - Switch device API
+ * 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/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net/switchdev.h>
+
+/**
+ * swdev_id_get - Get ID of a switch
+ * @dev: port device
+ * @psid: switch ID
+ *
+ * Get ID of a switch this port is part of.
+ */
+int swdev_id_get(struct net_device *dev, struct netdev_phys_item_id *psid)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ if (!ops->ndo_swdev_id_get)
+ return -EOPNOTSUPP;
+ return ops->ndo_swdev_id_get(dev, psid);
+}
+EXPORT_SYMBOL(swdev_id_get);
--
1.9.3
--
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