lc.c 12.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420
/*
 * WUSB Wire Adapter: WLP interface
 * Driver for the Linux Network stack.
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * FIXME: docs
 *
 * This implements a very simple network driver for the WLP USB
 * device that is associated to a UWB (Ultra Wide Band) host.
 *
 * This is seen as an interface of a composite device. Once the UWB
 * host has an association to another WLP capable device, the
 * networking interface (aka WLP) can start to send packets back and
 * forth.
 *
 * Limitations:
 *
 *  - Hand cranked; can't ifup the interface until there is an association
 *
 *  - BW allocation very simplistic [see i1480u_mas_set() and callees].
 *
 *
 * ROADMAP:
 *
 *   ENTRY POINTS (driver model):
 *
 *     i1480u_driver_{exit,init}(): initialization of the driver.
 *
 *     i1480u_probe(): called by the driver code when a device
 *                     matching 'i1480u_id_table' is connected.
 *
 *                     This allocs a netdev instance, inits with
 *                     i1480u_add(), then registers_netdev().
 *         i1480u_init()
 *         i1480u_add()
 *
 *     i1480u_disconnect(): device has been disconnected/module
 *                          is being removed.
 *         i1480u_rm()
 */
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/uwb/debug.h>
#include "i1480u-wlp.h"



static inline
void i1480u_init(struct i1480u *i1480u)
{
	/* nothing so far... doesn't it suck? */
	spin_lock_init(&i1480u->lock);
	INIT_LIST_HEAD(&i1480u->tx_list);
	spin_lock_init(&i1480u->tx_list_lock);
	wlp_options_init(&i1480u->options);
	edc_init(&i1480u->tx_errors);
	edc_init(&i1480u->rx_errors);
#ifdef i1480u_FLOW_CONTROL
	edc_init(&i1480u->notif_edc);
#endif
	stats_init(&i1480u->lqe_stats);
	stats_init(&i1480u->rssi_stats);
	wlp_init(&i1480u->wlp);
}

/**
 * Fill WLP device information structure
 *
 * The structure will contain a few character arrays, each ending with a
 * null terminated string. Each string has to fit (excluding terminating
 * character) into a specified range obtained from the WLP substack.
 *
 * It is still not clear exactly how this device information should be
 * obtained. Until we find out we use the USB device descriptor as backup, some
 * information elements have intuitive mappings, other not.
 */
static
void i1480u_fill_device_info(struct wlp *wlp, struct wlp_device_info *dev_info)
{
	struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
	struct usb_device *usb_dev = i1480u->usb_dev;
	/* Treat device name and model name the same */
	if (usb_dev->descriptor.iProduct) {
		usb_string(usb_dev, usb_dev->descriptor.iProduct,
			   dev_info->name, sizeof(dev_info->name));
		usb_string(usb_dev, usb_dev->descriptor.iProduct,
			   dev_info->model_name, sizeof(dev_info->model_name));
	}
	if (usb_dev->descriptor.iManufacturer)
		usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
			   dev_info->manufacturer,
			   sizeof(dev_info->manufacturer));
	scnprintf(dev_info->model_nr, sizeof(dev_info->model_nr), "%04x",
		  __le16_to_cpu(usb_dev->descriptor.bcdDevice));
	if (usb_dev->descriptor.iSerialNumber)
		usb_string(usb_dev, usb_dev->descriptor.iSerialNumber,
			   dev_info->serial, sizeof(dev_info->serial));
	/* FIXME: where should we obtain category? */
	dev_info->prim_dev_type.category = cpu_to_le16(WLP_DEV_CAT_OTHER);
	/* FIXME: Complete OUI and OUIsubdiv attributes */
}

#ifdef i1480u_FLOW_CONTROL
/**
 * Callback for the notification endpoint
 *
 * This mostly controls the xon/xoff protocol. In case of hard error,
 * we stop the queue. If not, we always retry.
 */
static
void i1480u_notif_cb(struct urb *urb, struct pt_regs *regs)
{
	struct i1480u *i1480u = urb->context;
	struct usb_interface *usb_iface = i1480u->usb_iface;
	struct device *dev = &usb_iface->dev;
	int result;

	switch (urb->status) {
	case 0:				/* Got valid data, do xon/xoff */
		switch (i1480u->notif_buffer[0]) {
		case 'N':
			dev_err(dev, "XOFF STOPPING queue at %lu\n", jiffies);
			netif_stop_queue(i1480u->net_dev);
			break;
		case 'A':
			dev_err(dev, "XON STARTING queue at %lu\n", jiffies);
			netif_start_queue(i1480u->net_dev);
			break;
		default:
			dev_err(dev, "NEP: unknown data 0x%02hhx\n",
				i1480u->notif_buffer[0]);
		}
		break;
	case -ECONNRESET:		/* Controlled situation ... */
	case -ENOENT:			/* we killed the URB... */
		dev_err(dev, "NEP: URB reset/noent %d\n", urb->status);
		goto error;
	case -ESHUTDOWN:		/* going away! */
		dev_err(dev, "NEP: URB down %d\n", urb->status);
		goto error;
	default:			/* Retry unless it gets ugly */
		if (edc_inc(&i1480u->notif_edc, EDC_MAX_ERRORS,
			    EDC_ERROR_TIMEFRAME)) {
			dev_err(dev, "NEP: URB max acceptable errors "
				"exceeded; resetting device\n");
			goto error_reset;
		}
		dev_err(dev, "NEP: URB error %d\n", urb->status);
		break;
	}
	result = usb_submit_urb(urb, GFP_ATOMIC);
	if (result < 0) {
		dev_err(dev, "NEP: Can't resubmit URB: %d; resetting device\n",
			result);
		goto error_reset;
	}
	return;

error_reset:
	wlp_reset_all(&i1480-wlp);
error:
	netif_stop_queue(i1480u->net_dev);
	return;
}
#endif

static
int i1480u_add(struct i1480u *i1480u, struct usb_interface *iface)
{
	int result = -ENODEV;
	struct wlp *wlp = &i1480u->wlp;
	struct usb_device *usb_dev = interface_to_usbdev(iface);
	struct net_device *net_dev = i1480u->net_dev;
	struct uwb_rc *rc;
	struct uwb_dev *uwb_dev;
#ifdef i1480u_FLOW_CONTROL
	struct usb_endpoint_descriptor *epd;
#endif

	i1480u->usb_dev = usb_get_dev(usb_dev);
	i1480u->usb_iface = iface;
	rc = uwb_rc_get_by_grandpa(&i1480u->usb_dev->dev);
	if (rc == NULL) {
		dev_err(&iface->dev, "Cannot get associated UWB Radio "
			"Controller\n");
		goto out;
	}
	wlp->xmit_frame = i1480u_xmit_frame;
	wlp->fill_device_info = i1480u_fill_device_info;
	wlp->stop_queue = i1480u_stop_queue;
	wlp->start_queue = i1480u_start_queue;
	result = wlp_setup(wlp, rc);
	if (result < 0) {
		dev_err(&iface->dev, "Cannot setup WLP\n");
		goto error_wlp_setup;
	}
	result = 0;
	ether_setup(net_dev);			/* make it an etherdevice */
	uwb_dev = &rc->uwb_dev;
	/* FIXME: hookup address change notifications? */

	memcpy(net_dev->dev_addr, uwb_dev->mac_addr.data,
	       sizeof(net_dev->dev_addr));

	net_dev->hard_header_len = sizeof(struct untd_hdr_cmp)
		+ sizeof(struct wlp_tx_hdr)
		+ WLP_DATA_HLEN
		+ ETH_HLEN;
	net_dev->mtu = 3500;
	net_dev->tx_queue_len = 20;		/* FIXME: maybe use 1000? */

/*	net_dev->flags &= ~IFF_BROADCAST;	FIXME: BUG in firmware */
	/* FIXME: multicast disabled */
	net_dev->flags &= ~IFF_MULTICAST;
	net_dev->features &= ~NETIF_F_SG;
	net_dev->features &= ~NETIF_F_FRAGLIST;
	/* All NETIF_F_*_CSUM disabled */
	net_dev->features |= NETIF_F_HIGHDMA;
	net_dev->watchdog_timeo = 5*HZ;		/* FIXME: a better default? */

	net_dev->open = i1480u_open;
	net_dev->stop = i1480u_stop;
	net_dev->hard_start_xmit = i1480u_hard_start_xmit;
	net_dev->tx_timeout = i1480u_tx_timeout;
	net_dev->get_stats = i1480u_get_stats;
	net_dev->set_config = i1480u_set_config;
	net_dev->change_mtu = i1480u_change_mtu;

#ifdef i1480u_FLOW_CONTROL
	/* Notification endpoint setup (submitted when we open the device) */
	i1480u->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (i1480u->notif_urb == NULL) {
		dev_err(&iface->dev, "Unable to allocate notification URB\n");
		result = -ENOMEM;
		goto error_urb_alloc;
	}
	epd = &iface->cur_altsetting->endpoint[0].desc;
	usb_fill_int_urb(i1480u->notif_urb, usb_dev,
			 usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
			 i1480u->notif_buffer, sizeof(i1480u->notif_buffer),
			 i1480u_notif_cb, i1480u, epd->bInterval);

#endif

	i1480u->tx_inflight.max = i1480u_TX_INFLIGHT_MAX;
	i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
	i1480u->tx_inflight.restart_ts = jiffies;
	usb_set_intfdata(iface, i1480u);
	return result;

#ifdef i1480u_FLOW_CONTROL
error_urb_alloc:
#endif
	wlp_remove(wlp);
error_wlp_setup:
	uwb_rc_put(rc);
out:
	usb_put_dev(i1480u->usb_dev);
	return result;
}

static void i1480u_rm(struct i1480u *i1480u)
{
	struct uwb_rc *rc = i1480u->wlp.rc;
	usb_set_intfdata(i1480u->usb_iface, NULL);
#ifdef i1480u_FLOW_CONTROL
	usb_kill_urb(i1480u->notif_urb);
	usb_free_urb(i1480u->notif_urb);
#endif
	wlp_remove(&i1480u->wlp);
	uwb_rc_put(rc);
	usb_put_dev(i1480u->usb_dev);
}

/** Just setup @net_dev's i1480u private data */
static void i1480u_netdev_setup(struct net_device *net_dev)
{
	struct i1480u *i1480u = netdev_priv(net_dev);
	/* Initialize @i1480u */
	memset(i1480u, 0, sizeof(*i1480u));
	i1480u_init(i1480u);
}

/**
 * Probe a i1480u interface and register it
 *
 * @iface:   USB interface to link to
 * @id:      USB class/subclass/protocol id
 * @returns: 0 if ok, < 0 errno code on error.
 *
 * Does basic housekeeping stuff and then allocs a netdev with space
 * for the i1480u  data. Initializes, registers in i1480u, registers in
 * netdev, ready to go.
 */
static int i1480u_probe(struct usb_interface *iface,
			const struct usb_device_id *id)
{
	int result;
	struct net_device *net_dev;
	struct device *dev = &iface->dev;
	struct i1480u *i1480u;

	/* Allocate instance [calls i1480u_netdev_setup() on it] */
	result = -ENOMEM;
	net_dev = alloc_netdev(sizeof(*i1480u), "wlp%d", i1480u_netdev_setup);
	if (net_dev == NULL) {
		dev_err(dev, "no memory for network device instance\n");
		goto error_alloc_netdev;
	}
	SET_NETDEV_DEV(net_dev, dev);
	i1480u = netdev_priv(net_dev);
	i1480u->net_dev = net_dev;
	result = i1480u_add(i1480u, iface);	/* Now setup all the wlp stuff */
	if (result < 0) {
		dev_err(dev, "cannot add i1480u device: %d\n", result);
		goto error_i1480u_add;
	}
	result = register_netdev(net_dev);	/* Okey dokey, bring it up */
	if (result < 0) {
		dev_err(dev, "cannot register network device: %d\n", result);
		goto error_register_netdev;
	}
	i1480u_sysfs_setup(i1480u);
	if (result < 0)
		goto error_sysfs_init;
	return 0;

error_sysfs_init:
	unregister_netdev(net_dev);
error_register_netdev:
	i1480u_rm(i1480u);
error_i1480u_add:
	free_netdev(net_dev);
error_alloc_netdev:
	return result;
}


/**
 * Disconect a i1480u from the system.
 *
 * i1480u_stop() has been called before, so al the rx and tx contexts
 * have been taken down already. Make sure the queue is stopped,
 * unregister netdev and i1480u, free and kill.
 */
static void i1480u_disconnect(struct usb_interface *iface)
{
	struct i1480u *i1480u;
	struct net_device *net_dev;

	i1480u = usb_get_intfdata(iface);
	net_dev = i1480u->net_dev;
	netif_stop_queue(net_dev);
#ifdef i1480u_FLOW_CONTROL
	usb_kill_urb(i1480u->notif_urb);
#endif
	i1480u_sysfs_release(i1480u);
	unregister_netdev(net_dev);
	i1480u_rm(i1480u);
	free_netdev(net_dev);
}

static struct usb_device_id i1480u_id_table[] = {
	{
		.match_flags = USB_DEVICE_ID_MATCH_DEVICE \
				|  USB_DEVICE_ID_MATCH_DEV_INFO \
				|  USB_DEVICE_ID_MATCH_INT_INFO,
		.idVendor = 0x8086,
		.idProduct = 0x0c3b,
		.bDeviceClass = 0xef,
		.bDeviceSubClass = 0x02,
		.bDeviceProtocol = 0x02,
		.bInterfaceClass = 0xff,
		.bInterfaceSubClass = 0xff,
		.bInterfaceProtocol = 0xff,
	},
	{},
};
MODULE_DEVICE_TABLE(usb, i1480u_id_table);

static struct usb_driver i1480u_driver = {
	.name =		KBUILD_MODNAME,
	.probe =	i1480u_probe,
	.disconnect =	i1480u_disconnect,
	.id_table =	i1480u_id_table,
};

static int __init i1480u_driver_init(void)
{
	return usb_register(&i1480u_driver);
}
module_init(i1480u_driver_init);


static void __exit i1480u_driver_exit(void)
{
	usb_deregister(&i1480u_driver);
}
module_exit(i1480u_driver_exit);

MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
MODULE_DESCRIPTION("i1480 Wireless UWB Link WLP networking for USB");
MODULE_LICENSE("GPL");