summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/ipath/ipath_layer.c
blob: e46aa4ed2a7e1123898d63e86d35f5ca99a61bf9 (plain)
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
/*
 * Copyright (c) 2006 QLogic, Inc. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * These are the routines used by layered drivers, currently just the
 * layered ethernet driver and verbs layer.
 */

#include <linux/io.h>
#include <linux/pci.h>
#include <asm/byteorder.h>

#include "ipath_kernel.h"
#include "ipath_layer.h"
#include "ipath_verbs.h"
#include "ipath_common.h"

/* Acquire before ipath_devs_lock. */
static DEFINE_MUTEX(ipath_layer_mutex);

u16 ipath_layer_rcv_opcode;

static int (*layer_intr)(void *, u32);
static int (*layer_rcv)(void *, void *, struct sk_buff *);
static int (*layer_rcv_lid)(void *, void *);

static void *(*layer_add_one)(int, struct ipath_devdata *);
static void (*layer_remove_one)(void *);

int __ipath_layer_intr(struct ipath_devdata *dd, u32 arg)
{
	int ret = -ENODEV;

	if (dd->ipath_layer.l_arg && layer_intr)
		ret = layer_intr(dd->ipath_layer.l_arg, arg);

	return ret;
}

int ipath_layer_intr(struct ipath_devdata *dd, u32 arg)
{
	int ret;

	mutex_lock(&ipath_layer_mutex);

	ret = __ipath_layer_intr(dd, arg);

	mutex_unlock(&ipath_layer_mutex);

	return ret;
}

int __ipath_layer_rcv(struct ipath_devdata *dd, void *hdr,
		      struct sk_buff *skb)
{
	int ret = -ENODEV;

	if (dd->ipath_layer.l_arg && layer_rcv)
		ret = layer_rcv(dd->ipath_layer.l_arg, hdr, skb);

	return ret;
}

int __ipath_layer_rcv_lid(struct ipath_devdata *dd, void *hdr)
{
	int ret = -ENODEV;

	if (dd->ipath_layer.l_arg && layer_rcv_lid)
		ret = layer_rcv_lid(dd->ipath_layer.l_arg, hdr);

	return ret;
}

void ipath_layer_lid_changed(struct ipath_devdata *dd)
{
	mutex_lock(&ipath_layer_mutex);

	if (dd->ipath_layer.l_arg && layer_intr)
		layer_intr(dd->ipath_layer.l_arg, IPATH_LAYER_INT_LID);

	mutex_unlock(&ipath_layer_mutex);
}

void ipath_layer_add(struct ipath_devdata *dd)
{
	mutex_lock(&ipath_layer_mutex);

	if (layer_add_one)
		dd->ipath_layer.l_arg =
			layer_add_one(dd->ipath_unit, dd);

	mutex_unlock(&ipath_layer_mutex);
}

void ipath_layer_remove(struct ipath_devdata *dd)
{
	mutex_lock(&ipath_layer_mutex);

	if (dd->ipath_layer.l_arg && layer_remove_one) {
		layer_remove_one(dd->ipath_layer.l_arg);
		dd->ipath_layer.l_arg = NULL;
	}

	mutex_unlock(&ipath_layer_mutex);
}

int ipath_layer_register(void *(*l_add)(int, struct ipath_devdata *),
			 void (*l_remove)(void *),
			 int (*l_intr)(void *, u32),
			 int (*l_rcv)(void *, void *, struct sk_buff *),
			 u16 l_rcv_opcode,
			 int (*l_rcv_lid)(void *, void *))
{
	struct ipath_devdata *dd, *tmp;
	unsigned long flags;

	mutex_lock(&ipath_layer_mutex);

	layer_add_one = l_add;
	layer_remove_one = l_remove;
	layer_intr = l_intr;
	layer_rcv = l_rcv;
	layer_rcv_lid = l_rcv_lid;
	ipath_layer_rcv_opcode = l_rcv_opcode;

	spin_lock_irqsave(&ipath_devs_lock, flags);

	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
		if (!(dd->ipath_flags & IPATH_INITTED))
			continue;

		if (dd->ipath_layer.l_arg)
			continue;

		spin_unlock_irqrestore(&ipath_devs_lock, flags);
		dd->ipath_layer.l_arg = l_add(dd->ipath_unit, dd);
		spin_lock_irqsave(&ipath_devs_lock, flags);
	}

	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	mutex_unlock(&ipath_layer_mutex);

	return 0;
}

EXPORT_SYMBOL_GPL(ipath_layer_register);

void ipath_layer_unregister(void)
{
	struct ipath_devdata *dd, *tmp;
	unsigned long flags;

	mutex_lock(&ipath_layer_mutex);
	spin_lock_irqsave(&ipath_devs_lock, flags);

	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
		if (dd->ipath_layer.l_arg && layer_remove_one) {
			spin_unlock_irqrestore(&ipath_devs_lock, flags);
			layer_remove_one(dd->ipath_layer.l_arg);
			spin_lock_irqsave(&ipath_devs_lock, flags);
			dd->ipath_layer.l_arg = NULL;
		}
	}

	spin_unlock_irqrestore(&ipath_devs_lock, flags);

	layer_add_one = NULL;
	layer_remove_one = NULL;
	layer_intr = NULL;
	layer_rcv = NULL;
	layer_rcv_lid = NULL;

	mutex_unlock(&ipath_layer_mutex);
}

EXPORT_SYMBOL_GPL(ipath_layer_unregister);

int ipath_layer_open(struct ipath_devdata *dd, u32 * pktmax)
{
	int ret;
	u32 intval = 0;

	mutex_lock(&ipath_layer_mutex);

	if (!dd->ipath_layer.l_arg) {
		ret = -EINVAL;
		goto bail;
	}

	ret = ipath_setrcvhdrsize(dd, IPATH_HEADER_QUEUE_WORDS);

	if (ret < 0)
		goto bail;

	*pktmax = dd->ipath_ibmaxlen;

	if (*dd->ipath_statusp & IPATH_STATUS_IB_READY)
		intval |= IPATH_LAYER_INT_IF_UP;
	if (dd->ipath_lid)
		intval |= IPATH_LAYER_INT_LID;
	if (dd->ipath_mlid)
		intval |= IPATH_LAYER_INT_BCAST;
	/*
	 * do this on open, in case low level is already up and
	 * just layered driver was reloaded, etc.
	 */
	if (intval)
		layer_intr(dd->ipath_layer.l_arg, intval);

	ret = 0;
bail:
	mutex_unlock(&ipath_layer_mutex);

	return ret;
}

EXPORT_SYMBOL_GPL(ipath_layer_open);

u16 ipath_layer_get_lid(struct ipath_devdata *dd)
{
	return dd->ipath_lid;
}

EXPORT_SYMBOL_GPL(ipath_layer_get_lid);

/**
 * ipath_layer_get_mac - get the MAC address
 * @dd: the infinipath device
 * @mac: the MAC is put here
 *
 * This is the EUID-64 OUI octets (top 3), then
 * skip the next 2 (which should both be zero or 0xff).
 * The returned MAC is in network order
 * mac points to at least 6 bytes of buffer
 * We assume that by the time the LID is set, that the GUID is as valid
 * as it's ever going to be, rather than adding yet another status bit.
 */

int ipath_layer_get_mac(struct ipath_devdata *dd, u8 * mac)
{
	u8 *guid;

	guid = (u8 *) &dd->ipath_guid;

	mac[0] = guid[0];
	mac[1] = guid[1];
	mac[2] = guid[2];
	mac[3] = guid[5];
	mac[4] = guid[6];
	mac[5] = guid[7];
	if ((guid[3] || guid[4]) && !(guid[3] == 0xff && guid[4] == 0xff))
		ipath_dbg("Warning, guid bytes 3 and 4 not 0 or 0xffff: "
			  "%x %x\n", guid[3], guid[4]);
	return 0;
}

EXPORT_SYMBOL_GPL(ipath_layer_get_mac);

u16 ipath_layer_get_bcast(struct ipath_devdata *dd)
{
	return dd->ipath_mlid;
}

EXPORT_SYMBOL_GPL(ipath_layer_get_bcast);

int ipath_layer_send_hdr(struct ipath_devdata *dd, struct ether_header *hdr)
{
	int ret = 0;
	u32 __iomem *piobuf;
	u32 plen, *uhdr;
	size_t count;
	__be16 vlsllnh;

	if (!(dd->ipath_flags & IPATH_RCVHDRSZ_SET)) {
		ipath_dbg("send while not open\n");
		ret = -EINVAL;
	} else
		if ((dd->ipath_flags & (IPATH_LINKUNK | IPATH_LINKDOWN)) ||
		    dd->ipath_lid == 0) {
			/*
			 * lid check is for when sma hasn't yet configured
			 */
			ret = -ENETDOWN;
			ipath_cdbg(VERBOSE, "send while not ready, "
				   "mylid=%u, flags=0x%x\n",
				   dd->ipath_lid, dd->ipath_flags);
		}

	vlsllnh = *((__be16 *) hdr);
	if (vlsllnh != htons(IPATH_LRH_BTH)) {
		ipath_dbg("Warning: lrh[0] wrong (%x, not %x); "
			  "not sending\n", be16_to_cpu(vlsllnh),
			  IPATH_LRH_BTH);
		ret = -EINVAL;
	}
	if (ret)
		goto done;

	/* Get a PIO buffer to use. */
	piobuf = ipath_getpiobuf(dd, NULL);
	if (piobuf == NULL) {
		ret = -EBUSY;
		goto done;
	}

	plen = (sizeof(*hdr) >> 2); /* actual length */
	ipath_cdbg(EPKT, "0x%x+1w pio %p\n", plen, piobuf);

	writeq(plen+1, piobuf); /* len (+1 for pad) to pbc, no flags */
	ipath_flush_wc();
	piobuf += 2;
	uhdr = (u32 *)hdr;
	count = plen-1; /* amount we can copy before trigger word */
	__iowrite32_copy(piobuf, uhdr, count);
	ipath_flush_wc();
	__raw_writel(uhdr[count], piobuf + count);
	ipath_flush_wc(); /* ensure it's sent, now */

	ipath_stats.sps_ether_spkts++;	/* ether packet sent */

done:
	return ret;
}

EXPORT_SYMBOL_GPL(ipath_layer_send_hdr);

int ipath_layer_set_piointbufavail_int(struct ipath_devdata *dd)
{
	set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);

	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
			 dd->ipath_sendctrl);
	return 0;
}

EXPORT_SYMBOL_GPL(ipath_layer_set_piointbufavail_int);
OpenPOWER on IntegriCloud