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linux_dsm_epyc7002/drivers/net/usb/cdc_subset.c
Arnd Bergmann c261344d3c usbnet: use eth%d name for known ethernet devices 
The documentation for the USB ethernet devices suggests that
only some devices are supposed to use usb0 as the network interface
name instead of eth0. The logic used there, and documented in
Kconfig for CDC is that eth0 will be used when the mac address
is a globally assigned one, but usb0 is used for the locally
managed range that is typically used on point-to-point links.

Unfortunately, this has caused a lot of pain on the smsc95xx
device that is used on the popular pandaboard without an
EEPROM to store the MAC address, which causes the driver to
call random_ether_address().

Obviously, there should be a proper MAC addressed assigned to
the device, and discussions are ongoing about how to solve
this, but this patch at least makes sure that the default
interface naming gets a little saner and matches what the
user can expect based on the documentation, including for
new devices.

The approach taken here is to flag whether a device might be a
point-to-point link with the new FLAG_POINTTOPOINT setting in
the usbnet driver_info. A driver can set both FLAG_POINTTOPOINT
and FLAG_ETHER if it is not sure (e.g. cdc_ether), or just one
of the two.  The usbnet framework only looks at the MAC address
for device naming if both flags are set, otherwise it trusts the
flag.

Signed-off-by: Arnd Bergmann <arnd.bergmann@linaro.org>
Tested-by: Andy Green <andy.green@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-04-01 20:12:02 -07:00

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/*
* Simple "CDC Subset" USB Networking Links
* Copyright (C) 2000-2005 by David Brownell
*
* 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.
*
* This program is distributed in the hope that 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/usbnet.h>
/*
* This supports simple USB network links that don't require any special
* framing or hardware control operations. The protocol used here is a
* strict subset of CDC Ethernet, with three basic differences reflecting
* the goal that almost any hardware should run it:
*
* - Minimal runtime control: one interface, no altsettings, and
* no vendor or class specific control requests. If a device is
* configured, it is allowed to exchange packets with the host.
* Fancier models would mean not working on some hardware.
*
* - Minimal manufacturing control: no IEEE "Organizationally
* Unique ID" required, or an EEPROMs to store one. Each host uses
* one random "locally assigned" Ethernet address instead, which can
* of course be overridden using standard tools like "ifconfig".
* (With 2^46 such addresses, same-net collisions are quite rare.)
*
* - There is no additional framing data for USB. Packets are written
* exactly as in CDC Ethernet, starting with an Ethernet header and
* terminated by a short packet. However, the host will never send a
* zero length packet; some systems can't handle those robustly.
*
* Anything that can transmit and receive USB bulk packets can implement
* this protocol. That includes both smart peripherals and quite a lot
* of "host-to-host" USB cables (which embed two devices back-to-back).
*
* Note that although Linux may use many of those host-to-host links
* with this "cdc_subset" framing, that doesn't mean there may not be a
* better approach. Handling the "other end unplugs/replugs" scenario
* well tends to require chip-specific vendor requests. Also, Windows
* peers at the other end of host-to-host cables may expect their own
* framing to be used rather than this "cdc_subset" model.
*/
#if defined(CONFIG_USB_EPSON2888) || defined(CONFIG_USB_ARMLINUX)
/* PDA style devices are always connected if present */
static int always_connected (struct usbnet *dev)
{
return 0;
}
#endif
#ifdef CONFIG_USB_ALI_M5632
#define HAVE_HARDWARE
/*-------------------------------------------------------------------------
*
* ALi M5632 driver ... does high speed
*
* NOTE that the MS-Windows drivers for this chip use some funky and
* (naturally) undocumented 7-byte prefix to each packet, so this is a
* case where we don't currently interoperate. Also, once you unplug
* one end of the cable, you need to replug the other end too ... since
* chip docs are unavailable, there's no way to reset the relevant state
* short of a power cycle.
*
*-------------------------------------------------------------------------*/
static const struct driver_info ali_m5632_info = {
.description = "ALi M5632",
.flags = FLAG_POINTTOPOINT,
};
#endif
#ifdef CONFIG_USB_AN2720
#define HAVE_HARDWARE
/*-------------------------------------------------------------------------
*
* AnchorChips 2720 driver ... http://www.cypress.com
*
* This doesn't seem to have a way to detect whether the peer is
* connected, or need any reset handshaking. It's got pretty big
* internal buffers (handles most of a frame's worth of data).
* Chip data sheets don't describe any vendor control messages.
*
*-------------------------------------------------------------------------*/
static const struct driver_info an2720_info = {
.description = "AnchorChips/Cypress 2720",
.flags = FLAG_POINTTOPOINT,
// no reset available!
// no check_connect available!
.in = 2, .out = 2, // direction distinguishes these
};
#endif /* CONFIG_USB_AN2720 */
#ifdef CONFIG_USB_BELKIN
#define HAVE_HARDWARE
/*-------------------------------------------------------------------------
*
* Belkin F5U104 ... two NetChip 2280 devices + Atmel AVR microcontroller
*
* ... also two eTEK designs, including one sold as "Advance USBNET"
*
*-------------------------------------------------------------------------*/
static const struct driver_info belkin_info = {
.description = "Belkin, eTEK, or compatible",
.flags = FLAG_POINTTOPOINT,
};
#endif /* CONFIG_USB_BELKIN */
#ifdef CONFIG_USB_EPSON2888
#define HAVE_HARDWARE
/*-------------------------------------------------------------------------
*
* EPSON USB clients
*
* This is the same idea as Linux PDAs (below) except the firmware in the
* device might not be Tux-powered. Epson provides reference firmware that
* implements this interface. Product developers can reuse or modify that
* code, such as by using their own product and vendor codes.
*
* Support was from Juro Bystricky <bystricky.juro@erd.epson.com>
*
*-------------------------------------------------------------------------*/
static const struct driver_info epson2888_info = {
.description = "Epson USB Device",
.check_connect = always_connected,
.flags = FLAG_POINTTOPOINT,
.in = 4, .out = 3,
};
#endif /* CONFIG_USB_EPSON2888 */
/*-------------------------------------------------------------------------
*
* info from Jonathan McDowell <noodles@earth.li>
*
*-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_KC2190
#define HAVE_HARDWARE
static const struct driver_info kc2190_info = {
.description = "KC Technology KC-190",
.flags = FLAG_POINTTOPOINT,
};
#endif /* CONFIG_USB_KC2190 */
#ifdef CONFIG_USB_ARMLINUX
#define HAVE_HARDWARE
/*-------------------------------------------------------------------------
*
* Intel's SA-1100 chip integrates basic USB support, and is used
* in PDAs like some iPaqs, the Yopy, some Zaurus models, and more.
* When they run Linux, arch/arm/mach-sa1100/usb-eth.c may be used to
* network using minimal USB framing data.
*
* This describes the driver currently in standard ARM Linux kernels.
* The Zaurus uses a different driver (see later).
*
* PXA25x and PXA210 use XScale cores (ARM v5TE) with better USB support
* and different USB endpoint numbering than the SA1100 devices. The
* mach-pxa/usb-eth.c driver re-uses the device ids from mach-sa1100
* so we rely on the endpoint descriptors.
*
*-------------------------------------------------------------------------*/
static const struct driver_info linuxdev_info = {
.description = "Linux Device",
.check_connect = always_connected,
.flags = FLAG_POINTTOPOINT,
};
static const struct driver_info yopy_info = {
.description = "Yopy",
.check_connect = always_connected,
.flags = FLAG_POINTTOPOINT,
};
static const struct driver_info blob_info = {
.description = "Boot Loader OBject",
.check_connect = always_connected,
.flags = FLAG_POINTTOPOINT,
};
#endif /* CONFIG_USB_ARMLINUX */
/*-------------------------------------------------------------------------*/
#ifndef HAVE_HARDWARE
#warning You need to configure some hardware for this driver
#endif
/*
* chip vendor names won't normally be on the cables, and
* may not be on the device.
*/
static const struct usb_device_id products [] = {
#ifdef CONFIG_USB_ALI_M5632
{
USB_DEVICE (0x0402, 0x5632), // ALi defaults
.driver_info = (unsigned long) &ali_m5632_info,
},
{
USB_DEVICE (0x182d,0x207c), // SiteCom CN-124
.driver_info = (unsigned long) &ali_m5632_info,
},
#endif
#ifdef CONFIG_USB_AN2720
{
USB_DEVICE (0x0547, 0x2720), // AnchorChips defaults
.driver_info = (unsigned long) &an2720_info,
}, {
USB_DEVICE (0x0547, 0x2727), // Xircom PGUNET
.driver_info = (unsigned long) &an2720_info,
},
#endif
#ifdef CONFIG_USB_BELKIN
{
USB_DEVICE (0x050d, 0x0004), // Belkin
.driver_info = (unsigned long) &belkin_info,
}, {
USB_DEVICE (0x056c, 0x8100), // eTEK
.driver_info = (unsigned long) &belkin_info,
}, {
USB_DEVICE (0x0525, 0x9901), // Advance USBNET (eTEK)
.driver_info = (unsigned long) &belkin_info,
},
#endif
#ifdef CONFIG_USB_EPSON2888
{
USB_DEVICE (0x0525, 0x2888), // EPSON USB client
.driver_info = (unsigned long) &epson2888_info,
},
#endif
#ifdef CONFIG_USB_KC2190
{
USB_DEVICE (0x050f, 0x0190), // KC-190
.driver_info = (unsigned long) &kc2190_info,
},
#endif
#ifdef CONFIG_USB_ARMLINUX
/*
* SA-1100 using standard ARM Linux kernels, or compatible.
* Often used when talking to Linux PDAs (iPaq, Yopy, etc).
* The sa-1100 "usb-eth" driver handles the basic framing.
*
* PXA25x or PXA210 ... these use a "usb-eth" driver much like
* the sa1100 one, but hardware uses different endpoint numbers.
*
* Or the Linux "Ethernet" gadget on hardware that can't talk
* CDC Ethernet (e.g., no altsettings), in either of two modes:
* - acting just like the old "usb-eth" firmware, though
* the implementation is different
* - supporting RNDIS as the first/default configuration for
* MS-Windows interop; Linux needs to use the other config
*/
{
// 1183 = 0x049F, both used as hex values?
// Compaq "Itsy" vendor/product id
USB_DEVICE (0x049F, 0x505A), // usb-eth, or compatible
.driver_info = (unsigned long) &linuxdev_info,
}, {
USB_DEVICE (0x0E7E, 0x1001), // G.Mate "Yopy"
.driver_info = (unsigned long) &yopy_info,
}, {
USB_DEVICE (0x8086, 0x07d3), // "blob" bootloader
.driver_info = (unsigned long) &blob_info,
}, {
USB_DEVICE (0x1286, 0x8001), // "blob" bootloader
.driver_info = (unsigned long) &blob_info,
}, {
// Linux Ethernet/RNDIS gadget, mostly on PXA, second config
// e.g. Gumstix, current OpenZaurus, ... or anything else
// that just enables this gadget option.
USB_DEVICE (0x0525, 0xa4a2),
.driver_info = (unsigned long) &linuxdev_info,
},
#endif
{ }, // END
};
MODULE_DEVICE_TABLE(usb, products);
/*-------------------------------------------------------------------------*/
static struct usb_driver cdc_subset_driver = {
.name = "cdc_subset",
.probe = usbnet_probe,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.disconnect = usbnet_disconnect,
.id_table = products,
};
static int __init cdc_subset_init(void)
{
return usb_register(&cdc_subset_driver);
}
module_init(cdc_subset_init);
static void __exit cdc_subset_exit(void)
{
usb_deregister(&cdc_subset_driver);
}
module_exit(cdc_subset_exit);
MODULE_AUTHOR("David Brownell");
MODULE_DESCRIPTION("Simple 'CDC Subset' USB networking links");
MODULE_LICENSE("GPL");
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