aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/mlx4/mcg.c
blob: 672024a0ee71e4053237f3af7124a6ebb290d104 (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
367
368
369
370
371
372
373
374
375
376
377
378
379
380
/*
 * Copyright (c) 2006, 2007 Cisco Systems, 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.
 */

#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>

#include <linux/mlx4/cmd.h>

#include "mlx4.h"

struct mlx4_mgm {
	__be32			next_gid_index;
	__be32			members_count;
	u32			reserved[2];
	u8			gid[16];
	__be32			qp[MLX4_QP_PER_MGM];
};

static const u8 zero_gid[16];	/* automatically initialized to 0 */

static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
			 struct mlx4_cmd_mailbox *mailbox)
{
	return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
			    MLX4_CMD_TIME_CLASS_A);
}

static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
			  struct mlx4_cmd_mailbox *mailbox)
{
	return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
			MLX4_CMD_TIME_CLASS_A);
}

static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
			  u16 *hash)
{
	u64 imm;
	int err;

	err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
			   MLX4_CMD_TIME_CLASS_A);

	if (!err)
		*hash = imm;

	return err;
}

/*
 * Caller must hold MCG table semaphore.  gid and mgm parameters must
 * be properly aligned for command interface.
 *
 *  Returns 0 unless a firmware command error occurs.
 *
 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
 * and *mgm holds MGM entry.
 *
 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
 * previous entry in hash chain and *mgm holds AMGM entry.
 *
 * If no AMGM exists for given gid, *index = -1, *prev = index of last
 * entry in hash chain and *mgm holds end of hash chain.
 */
static int find_mgm(struct mlx4_dev *dev,
		    u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
		    u16 *hash, int *prev, int *index)
{
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mgm *mgm = mgm_mailbox->buf;
	u8 *mgid;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return -ENOMEM;
	mgid = mailbox->buf;

	memcpy(mgid, gid, 16);

	err = mlx4_MGID_HASH(dev, mailbox, hash);
	mlx4_free_cmd_mailbox(dev, mailbox);
	if (err)
		return err;

	if (0)
		mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
			  "%04x:%04x:%04x:%04x is %04x\n",
			  be16_to_cpu(((__be16 *) gid)[0]),
			  be16_to_cpu(((__be16 *) gid)[1]),
			  be16_to_cpu(((__be16 *) gid)[2]),
			  be16_to_cpu(((__be16 *) gid)[3]),
			  be16_to_cpu(((__be16 *) gid)[4]),
			  be16_to_cpu(((__be16 *) gid)[5]),
			  be16_to_cpu(((__be16 *) gid)[6]),
			  be16_to_cpu(((__be16 *) gid)[7]),
			  *hash);

	*index = *hash;
	*prev  = -1;

	do {
		err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
		if (err)
			return err;

		if (!memcmp(mgm->gid, zero_gid, 16)) {
			if (*index != *hash) {
				mlx4_err(dev, "Found zero MGID in AMGM.\n");
				err = -EINVAL;
			}
			return err;
		}

		if (!memcmp(mgm->gid, gid, 16))
			return err;

		*prev = *index;
		*index = be32_to_cpu(mgm->next_gid_index) >> 6;
	} while (*index);

	*index = -1;
	return err;
}

int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mgm *mgm;
	u32 members_count;
	u16 hash;
	int index, prev;
	int link = 0;
	int i;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	mgm = mailbox->buf;

	mutex_lock(&priv->mcg_table.mutex);

	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	if (err)
		goto out;

	if (index != -1) {
		if (!memcmp(mgm->gid, zero_gid, 16))
			memcpy(mgm->gid, gid, 16);
	} else {
		link = 1;

		index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
		if (index == -1) {
			mlx4_err(dev, "No AMGM entries left\n");
			err = -ENOMEM;
			goto out;
		}
		index += dev->caps.num_mgms;

		err = mlx4_READ_MCG(dev, index, mailbox);
		if (err)
			goto out;

		memset(mgm, 0, sizeof *mgm);
		memcpy(mgm->gid, gid, 16);
	}

	members_count = be32_to_cpu(mgm->members_count);
	if (members_count == MLX4_QP_PER_MGM) {
		mlx4_err(dev, "MGM at index %x is full.\n", index);
		err = -ENOMEM;
		goto out;
	}

	for (i = 0; i < members_count; ++i)
		if (mgm->qp[i] == cpu_to_be32(qp->qpn)) {
			mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
			err = 0;
			goto out;
		}

	mgm->qp[members_count++] = cpu_to_be32(qp->qpn);
	mgm->members_count       = cpu_to_be32(members_count);

	err = mlx4_WRITE_MCG(dev, index, mailbox);
	if (err)
		goto out;

	if (!link)
		goto out;

	err = mlx4_READ_MCG(dev, prev, mailbox);
	if (err)
		goto out;

	mgm->next_gid_index = cpu_to_be32(index << 6);

	err = mlx4_WRITE_MCG(dev, prev, mailbox);
	if (err)
		goto out;

out:
	if (err && link && index != -1) {
		if (index < dev->caps.num_mgms)
			mlx4_warn(dev, "Got AMGM index %d < %d",
				  index, dev->caps.num_mgms);
		else
			mlx4_bitmap_free(&priv->mcg_table.bitmap,
					 index - dev->caps.num_mgms);
	}
	mutex_unlock(&priv->mcg_table.mutex);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}
EXPORT_SYMBOL_GPL(mlx4_multicast_attach);

int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_mgm *mgm;
	u32 members_count;
	u16 hash;
	int prev, index;
	int i, loc;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	mgm = mailbox->buf;

	mutex_lock(&priv->mcg_table.mutex);

	err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
	if (err)
		goto out;

	if (index == -1) {
		mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
			  "not found\n",
			  be16_to_cpu(((__be16 *) gid)[0]),
			  be16_to_cpu(((__be16 *) gid)[1]),
			  be16_to_cpu(((__be16 *) gid)[2]),
			  be16_to_cpu(((__be16 *) gid)[3]),
			  be16_to_cpu(((__be16 *) gid)[4]),
			  be16_to_cpu(((__be16 *) gid)[5]),
			  be16_to_cpu(((__be16 *) gid)[6]),
			  be16_to_cpu(((__be16 *) gid)[7]));
		err = -EINVAL;
		goto out;
	}

	members_count = be32_to_cpu(mgm->members_count);
	for (loc = -1, i = 0; i < members_count; ++i)
		if (mgm->qp[i] == cpu_to_be32(qp->qpn))
			loc = i;

	if (loc == -1) {
		mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
		err = -EINVAL;
		goto out;
	}


	mgm->members_count = cpu_to_be32(--members_count);
	mgm->qp[loc]       = mgm->qp[i - 1];
	mgm->qp[i - 1]     = 0;

	err = mlx4_WRITE_MCG(dev, index, mailbox);
	if (err)
		goto out;

	if (i != 1)
		goto out;

	if (prev == -1) {
		/* Remove entry from MGM */
		int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
		if (amgm_index) {
			err = mlx4_READ_MCG(dev, amgm_index, mailbox);
			if (err)
				goto out;
		} else
			memset(mgm->gid, 0, 16);

		err = mlx4_WRITE_MCG(dev, index, mailbox);
		if (err)
			goto out;

		if (amgm_index) {
			if (amgm_index < dev->caps.num_mgms)
				mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
					  index, amgm_index, dev->caps.num_mgms);
			else
				mlx4_bitmap_free(&priv->mcg_table.bitmap,
						 amgm_index - dev->caps.num_mgms);
		}
	} else {
		/* Remove entry from AMGM */
		int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
		err = mlx4_READ_MCG(dev, prev, mailbox);
		if (err)
			goto out;

		mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);

		err = mlx4_WRITE_MCG(dev, prev, mailbox);
		if (err)
			goto out;

		if (index < dev->caps.num_mgms)
			mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
				  prev, index, dev->caps.num_mgms);
		else
			mlx4_bitmap_free(&priv->mcg_table.bitmap,
					 index - dev->caps.num_mgms);
	}

out:
	mutex_unlock(&priv->mcg_table.mutex);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}
EXPORT_SYMBOL_GPL(mlx4_multicast_detach);

int __devinit mlx4_init_mcg_table(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int err;

	err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
			       dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
	if (err)
		return err;

	mutex_init(&priv->mcg_table.mutex);

	return 0;
}

void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
{
	mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
}