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ba2d358791
cleanup patch. Use new __packed annotation in drivers/net/ Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
607 lines
15 KiB
C
607 lines
15 KiB
C
/*
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* Net1080 based USB host-to-host cables
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* Copyright (C) 2000-2005 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// #define DEBUG // error path messages, extra info
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// #define VERBOSE // more; success messages
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/usbnet.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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/*
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* Netchip 1080 driver ... http://www.netchip.com
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* (Sept 2004: End-of-life announcement has been sent.)
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* Used in (some) LapLink cables
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*/
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#define frame_errors data[1]
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/*
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* NetChip framing of ethernet packets, supporting additional error
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* checks for links that may drop bulk packets from inside messages.
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* Odd USB length == always short read for last usb packet.
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* - nc_header
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* - Ethernet header (14 bytes)
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* - payload
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* - (optional padding byte, if needed so length becomes odd)
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* - nc_trailer
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*
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* This framing is to be avoided for non-NetChip devices.
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*/
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struct nc_header { // packed:
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__le16 hdr_len; // sizeof nc_header (LE, all)
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__le16 packet_len; // payload size (including ethhdr)
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__le16 packet_id; // detects dropped packets
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#define MIN_HEADER 6
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// all else is optional, and must start with:
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// __le16 vendorId; // from usb-if
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// __le16 productId;
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} __packed;
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#define PAD_BYTE ((unsigned char)0xAC)
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struct nc_trailer {
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__le16 packet_id;
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} __packed;
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// packets may use FLAG_FRAMING_NC and optional pad
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#define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \
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+ sizeof (struct ethhdr) \
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+ (mtu) \
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+ 1 \
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+ sizeof (struct nc_trailer))
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#define MIN_FRAMED FRAMED_SIZE(0)
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/* packets _could_ be up to 64KB... */
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#define NC_MAX_PACKET 32767
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/*
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* Zero means no timeout; else, how long a 64 byte bulk packet may be queued
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* before the hardware drops it. If that's done, the driver will need to
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* frame network packets to guard against the dropped USB packets. The win32
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* driver sets this for both sides of the link.
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*/
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#define NC_READ_TTL_MS ((u8)255) // ms
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/*
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* We ignore most registers and EEPROM contents.
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*/
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#define REG_USBCTL ((u8)0x04)
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#define REG_TTL ((u8)0x10)
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#define REG_STATUS ((u8)0x11)
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/*
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* Vendor specific requests to read/write data
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*/
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#define REQUEST_REGISTER ((u8)0x10)
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#define REQUEST_EEPROM ((u8)0x11)
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static int
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nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr)
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{
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int status = usb_control_msg(dev->udev,
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usb_rcvctrlpipe(dev->udev, 0),
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req,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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0, regnum,
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retval_ptr, sizeof *retval_ptr,
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USB_CTRL_GET_TIMEOUT);
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if (status > 0)
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status = 0;
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if (!status)
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le16_to_cpus(retval_ptr);
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return status;
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}
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static inline int
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nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr)
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{
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return nc_vendor_read(dev, REQUEST_REGISTER, regnum, retval_ptr);
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}
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// no retval ... can become async, usable in_interrupt()
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static void
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nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value)
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{
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usb_control_msg(dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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req,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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value, regnum,
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NULL, 0, // data is in setup packet
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USB_CTRL_SET_TIMEOUT);
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}
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static inline void
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nc_register_write(struct usbnet *dev, u8 regnum, u16 value)
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{
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nc_vendor_write(dev, REQUEST_REGISTER, regnum, value);
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}
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#if 0
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static void nc_dump_registers(struct usbnet *dev)
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{
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u8 reg;
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u16 *vp = kmalloc(sizeof (u16));
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if (!vp) {
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dbg("no memory?");
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return;
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}
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dbg("%s registers:", dev->net->name);
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for (reg = 0; reg < 0x20; reg++) {
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int retval;
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// reading some registers is trouble
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if (reg >= 0x08 && reg <= 0xf)
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continue;
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if (reg >= 0x12 && reg <= 0x1e)
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continue;
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retval = nc_register_read(dev, reg, vp);
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if (retval < 0)
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dbg("%s reg [0x%x] ==> error %d",
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dev->net->name, reg, retval);
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else
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dbg("%s reg [0x%x] = 0x%x",
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dev->net->name, reg, *vp);
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}
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kfree(vp);
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}
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#endif
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/*-------------------------------------------------------------------------*/
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/*
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* Control register
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*/
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#define USBCTL_WRITABLE_MASK 0x1f0f
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// bits 15-13 reserved, r/o
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#define USBCTL_ENABLE_LANG (1 << 12)
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#define USBCTL_ENABLE_MFGR (1 << 11)
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#define USBCTL_ENABLE_PROD (1 << 10)
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#define USBCTL_ENABLE_SERIAL (1 << 9)
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#define USBCTL_ENABLE_DEFAULTS (1 << 8)
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// bits 7-4 reserved, r/o
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#define USBCTL_FLUSH_OTHER (1 << 3)
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#define USBCTL_FLUSH_THIS (1 << 2)
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#define USBCTL_DISCONN_OTHER (1 << 1)
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#define USBCTL_DISCONN_THIS (1 << 0)
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static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl)
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{
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netif_dbg(dev, link, dev->net,
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"net1080 %s-%s usbctl 0x%x:%s%s%s%s%s; this%s%s; other%s%s; r/o 0x%x\n",
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dev->udev->bus->bus_name, dev->udev->devpath,
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usbctl,
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(usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
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(usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
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(usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
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(usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
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(usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
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(usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
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(usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
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(usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
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(usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
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usbctl & ~USBCTL_WRITABLE_MASK);
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}
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/*-------------------------------------------------------------------------*/
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/*
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* Status register
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*/
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#define STATUS_PORT_A (1 << 15)
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#define STATUS_CONN_OTHER (1 << 14)
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#define STATUS_SUSPEND_OTHER (1 << 13)
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#define STATUS_MAILBOX_OTHER (1 << 12)
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#define STATUS_PACKETS_OTHER(n) (((n) >> 8) & 0x03)
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#define STATUS_CONN_THIS (1 << 6)
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#define STATUS_SUSPEND_THIS (1 << 5)
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#define STATUS_MAILBOX_THIS (1 << 4)
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#define STATUS_PACKETS_THIS(n) (((n) >> 0) & 0x03)
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#define STATUS_UNSPEC_MASK 0x0c8c
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#define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK))
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static inline void nc_dump_status(struct usbnet *dev, u16 status)
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{
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netif_dbg(dev, link, dev->net,
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"net1080 %s-%s status 0x%x: this (%c) PKT=%d%s%s%s; other PKT=%d%s%s%s; unspec 0x%x\n",
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dev->udev->bus->bus_name, dev->udev->devpath,
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status,
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// XXX the packet counts don't seem right
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// (1 at reset, not 0); maybe UNSPEC too
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(status & STATUS_PORT_A) ? 'A' : 'B',
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STATUS_PACKETS_THIS(status),
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(status & STATUS_CONN_THIS) ? " CON" : "",
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(status & STATUS_SUSPEND_THIS) ? " SUS" : "",
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(status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
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STATUS_PACKETS_OTHER(status),
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(status & STATUS_CONN_OTHER) ? " CON" : "",
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(status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
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(status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
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status & STATUS_UNSPEC_MASK);
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}
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/*-------------------------------------------------------------------------*/
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/*
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* TTL register
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*/
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#define TTL_THIS(ttl) (0x00ff & ttl)
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#define TTL_OTHER(ttl) (0x00ff & (ttl >> 8))
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#define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this))))
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static inline void nc_dump_ttl(struct usbnet *dev, u16 ttl)
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{
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netif_dbg(dev, link, dev->net, "net1080 %s-%s ttl 0x%x this = %d, other = %d\n",
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dev->udev->bus->bus_name, dev->udev->devpath,
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ttl, TTL_THIS(ttl), TTL_OTHER(ttl));
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}
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/*-------------------------------------------------------------------------*/
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static int net1080_reset(struct usbnet *dev)
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{
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u16 usbctl, status, ttl;
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u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL);
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int retval;
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if (!vp)
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return -ENOMEM;
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// nc_dump_registers(dev);
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if ((retval = nc_register_read(dev, REG_STATUS, vp)) < 0) {
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dbg("can't read %s-%s status: %d",
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dev->udev->bus->bus_name, dev->udev->devpath, retval);
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goto done;
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}
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status = *vp;
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nc_dump_status(dev, status);
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if ((retval = nc_register_read(dev, REG_USBCTL, vp)) < 0) {
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dbg("can't read USBCTL, %d", retval);
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goto done;
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}
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usbctl = *vp;
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nc_dump_usbctl(dev, usbctl);
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nc_register_write(dev, REG_USBCTL,
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USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
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if ((retval = nc_register_read(dev, REG_TTL, vp)) < 0) {
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dbg("can't read TTL, %d", retval);
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goto done;
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}
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ttl = *vp;
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// nc_dump_ttl(dev, ttl);
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nc_register_write(dev, REG_TTL,
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MK_TTL(NC_READ_TTL_MS, TTL_OTHER(ttl)) );
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dbg("%s: assigned TTL, %d ms", dev->net->name, NC_READ_TTL_MS);
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netif_info(dev, link, dev->net, "port %c, peer %sconnected\n",
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(status & STATUS_PORT_A) ? 'A' : 'B',
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(status & STATUS_CONN_OTHER) ? "" : "dis");
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retval = 0;
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done:
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kfree(vp);
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return retval;
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}
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static int net1080_check_connect(struct usbnet *dev)
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{
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int retval;
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u16 status;
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u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL);
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if (!vp)
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return -ENOMEM;
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retval = nc_register_read(dev, REG_STATUS, vp);
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status = *vp;
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kfree(vp);
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if (retval != 0) {
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dbg("%s net1080_check_conn read - %d", dev->net->name, retval);
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return retval;
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}
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if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER)
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return -ENOLINK;
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return 0;
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}
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static void nc_flush_complete(struct urb *urb)
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{
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kfree(urb->context);
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usb_free_urb(urb);
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}
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static void nc_ensure_sync(struct usbnet *dev)
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{
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dev->frame_errors++;
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if (dev->frame_errors > 5) {
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struct urb *urb;
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struct usb_ctrlrequest *req;
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int status;
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/* Send a flush */
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urb = usb_alloc_urb(0, GFP_ATOMIC);
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if (!urb)
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return;
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req = kmalloc(sizeof *req, GFP_ATOMIC);
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if (!req) {
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usb_free_urb(urb);
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return;
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}
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req->bRequestType = USB_DIR_OUT
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| USB_TYPE_VENDOR
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| USB_RECIP_DEVICE;
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req->bRequest = REQUEST_REGISTER;
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req->wValue = cpu_to_le16(USBCTL_FLUSH_THIS
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| USBCTL_FLUSH_OTHER);
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req->wIndex = cpu_to_le16(REG_USBCTL);
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req->wLength = cpu_to_le16(0);
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/* queue an async control request, we don't need
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* to do anything when it finishes except clean up.
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*/
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usb_fill_control_urb(urb, dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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(unsigned char *) req,
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NULL, 0,
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nc_flush_complete, req);
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status = usb_submit_urb(urb, GFP_ATOMIC);
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if (status) {
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kfree(req);
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usb_free_urb(urb);
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return;
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}
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netif_dbg(dev, rx_err, dev->net,
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"flush net1080; too many framing errors\n");
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dev->frame_errors = 0;
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}
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}
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static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
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{
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struct nc_header *header;
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struct nc_trailer *trailer;
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u16 hdr_len, packet_len;
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if (!(skb->len & 0x01)) {
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#ifdef DEBUG
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struct net_device *net = dev->net;
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dbg("rx framesize %d range %d..%d mtu %d", skb->len,
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net->hard_header_len, dev->hard_mtu, net->mtu);
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#endif
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dev->net->stats.rx_frame_errors++;
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nc_ensure_sync(dev);
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return 0;
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}
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header = (struct nc_header *) skb->data;
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hdr_len = le16_to_cpup(&header->hdr_len);
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packet_len = le16_to_cpup(&header->packet_len);
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if (FRAMED_SIZE(packet_len) > NC_MAX_PACKET) {
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dev->net->stats.rx_frame_errors++;
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dbg("packet too big, %d", packet_len);
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nc_ensure_sync(dev);
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return 0;
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} else if (hdr_len < MIN_HEADER) {
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dev->net->stats.rx_frame_errors++;
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dbg("header too short, %d", hdr_len);
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nc_ensure_sync(dev);
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return 0;
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} else if (hdr_len > MIN_HEADER) {
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// out of band data for us?
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dbg("header OOB, %d bytes", hdr_len - MIN_HEADER);
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nc_ensure_sync(dev);
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// switch (vendor/product ids) { ... }
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}
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skb_pull(skb, hdr_len);
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trailer = (struct nc_trailer *)
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(skb->data + skb->len - sizeof *trailer);
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skb_trim(skb, skb->len - sizeof *trailer);
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if ((packet_len & 0x01) == 0) {
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if (skb->data [packet_len] != PAD_BYTE) {
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dev->net->stats.rx_frame_errors++;
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dbg("bad pad");
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return 0;
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}
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skb_trim(skb, skb->len - 1);
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}
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if (skb->len != packet_len) {
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dev->net->stats.rx_frame_errors++;
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dbg("bad packet len %d (expected %d)",
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skb->len, packet_len);
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nc_ensure_sync(dev);
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return 0;
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}
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if (header->packet_id != get_unaligned(&trailer->packet_id)) {
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dev->net->stats.rx_fifo_errors++;
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dbg("(2+ dropped) rx packet_id mismatch 0x%x 0x%x",
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le16_to_cpu(header->packet_id),
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le16_to_cpu(trailer->packet_id));
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return 0;
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}
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#if 0
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netdev_dbg(dev->net, "frame <rx h %d p %d id %d\n", header->hdr_len,
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header->packet_len, header->packet_id);
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#endif
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dev->frame_errors = 0;
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return 1;
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}
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static struct sk_buff *
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net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
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{
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struct sk_buff *skb2;
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struct nc_header *header = NULL;
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struct nc_trailer *trailer = NULL;
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int padlen = sizeof (struct nc_trailer);
|
|
int len = skb->len;
|
|
|
|
if (!((len + padlen + sizeof (struct nc_header)) & 0x01))
|
|
padlen++;
|
|
if (!skb_cloned(skb)) {
|
|
int headroom = skb_headroom(skb);
|
|
int tailroom = skb_tailroom(skb);
|
|
|
|
if (padlen <= tailroom &&
|
|
sizeof(struct nc_header) <= headroom)
|
|
/* There's enough head and tail room */
|
|
goto encapsulate;
|
|
|
|
if ((sizeof (struct nc_header) + padlen) <
|
|
(headroom + tailroom)) {
|
|
/* There's enough total room, so just readjust */
|
|
skb->data = memmove(skb->head
|
|
+ sizeof (struct nc_header),
|
|
skb->data, skb->len);
|
|
skb_set_tail_pointer(skb, len);
|
|
goto encapsulate;
|
|
}
|
|
}
|
|
|
|
/* Create a new skb to use with the correct size */
|
|
skb2 = skb_copy_expand(skb,
|
|
sizeof (struct nc_header),
|
|
padlen,
|
|
flags);
|
|
dev_kfree_skb_any(skb);
|
|
if (!skb2)
|
|
return skb2;
|
|
skb = skb2;
|
|
|
|
encapsulate:
|
|
/* header first */
|
|
header = (struct nc_header *) skb_push(skb, sizeof *header);
|
|
header->hdr_len = cpu_to_le16(sizeof (*header));
|
|
header->packet_len = cpu_to_le16(len);
|
|
header->packet_id = cpu_to_le16((u16)dev->xid++);
|
|
|
|
/* maybe pad; then trailer */
|
|
if (!((skb->len + sizeof *trailer) & 0x01))
|
|
*skb_put(skb, 1) = PAD_BYTE;
|
|
trailer = (struct nc_trailer *) skb_put(skb, sizeof *trailer);
|
|
put_unaligned(header->packet_id, &trailer->packet_id);
|
|
#if 0
|
|
netdev_dbg(dev->net, "frame >tx h %d p %d id %d\n",
|
|
header->hdr_len, header->packet_len,
|
|
header->packet_id);
|
|
#endif
|
|
return skb;
|
|
}
|
|
|
|
static int net1080_bind(struct usbnet *dev, struct usb_interface *intf)
|
|
{
|
|
unsigned extra = sizeof (struct nc_header)
|
|
+ 1
|
|
+ sizeof (struct nc_trailer);
|
|
|
|
dev->net->hard_header_len += extra;
|
|
dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
|
|
dev->hard_mtu = NC_MAX_PACKET;
|
|
return usbnet_get_endpoints (dev, intf);
|
|
}
|
|
|
|
static const struct driver_info net1080_info = {
|
|
.description = "NetChip TurboCONNECT",
|
|
.flags = FLAG_FRAMING_NC,
|
|
.bind = net1080_bind,
|
|
.reset = net1080_reset,
|
|
.check_connect = net1080_check_connect,
|
|
.rx_fixup = net1080_rx_fixup,
|
|
.tx_fixup = net1080_tx_fixup,
|
|
};
|
|
|
|
static const struct usb_device_id products [] = {
|
|
{
|
|
USB_DEVICE(0x0525, 0x1080), // NetChip ref design
|
|
.driver_info = (unsigned long) &net1080_info,
|
|
}, {
|
|
USB_DEVICE(0x06D0, 0x0622), // Laplink Gold
|
|
.driver_info = (unsigned long) &net1080_info,
|
|
},
|
|
{ }, // END
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, products);
|
|
|
|
static struct usb_driver net1080_driver = {
|
|
.name = "net1080",
|
|
.id_table = products,
|
|
.probe = usbnet_probe,
|
|
.disconnect = usbnet_disconnect,
|
|
.suspend = usbnet_suspend,
|
|
.resume = usbnet_resume,
|
|
};
|
|
|
|
static int __init net1080_init(void)
|
|
{
|
|
return usb_register(&net1080_driver);
|
|
}
|
|
module_init(net1080_init);
|
|
|
|
static void __exit net1080_exit(void)
|
|
{
|
|
usb_deregister(&net1080_driver);
|
|
}
|
|
module_exit(net1080_exit);
|
|
|
|
MODULE_AUTHOR("David Brownell");
|
|
MODULE_DESCRIPTION("NetChip 1080 based USB Host-to-Host Links");
|
|
MODULE_LICENSE("GPL");
|