tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/init.h>
35#include <linux/string.h>
36#include <linux/slab.h>
37
38#include <linux/mlx4/cmd.h>
39
40#include "mlx4.h"
41
42#define MGM_QPN_MASK 0x00FFFFFF
43#define MGM_BLCK_LB_BIT 30
44
45struct mlx4_mgm {
46 __be32 next_gid_index;
47 __be32 members_count;
48 u32 reserved[2];
49 u8 gid[16];
50 __be32 qp[MLX4_QP_PER_MGM];
51};
52
53static const u8 zero_gid[16]; /* automatically initialized to 0 */
54
55static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
56 struct mlx4_cmd_mailbox *mailbox)
57{
58 return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
59 MLX4_CMD_TIME_CLASS_A);
60}
61
62static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
63 struct mlx4_cmd_mailbox *mailbox)
64{
65 return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
66 MLX4_CMD_TIME_CLASS_A);
67}
68
69static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
70 u16 *hash)
71{
72 u64 imm;
73 int err;
74
75 err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
76 MLX4_CMD_TIME_CLASS_A);
77
78 if (!err)
79 *hash = imm;
80
81 return err;
82}
83
84/*
85 * Caller must hold MCG table semaphore. gid and mgm parameters must
86 * be properly aligned for command interface.
87 *
88 * Returns 0 unless a firmware command error occurs.
89 *
90 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
91 * and *mgm holds MGM entry.
92 *
93 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
94 * previous entry in hash chain and *mgm holds AMGM entry.
95 *
96 * If no AMGM exists for given gid, *index = -1, *prev = index of last
97 * entry in hash chain and *mgm holds end of hash chain.
98 */
99static int find_mgm(struct mlx4_dev *dev,
100 u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
101 u16 *hash, int *prev, int *index)
102{
103 struct mlx4_cmd_mailbox *mailbox;
104 struct mlx4_mgm *mgm = mgm_mailbox->buf;
105 u8 *mgid;
106 int err;
107
108 mailbox = mlx4_alloc_cmd_mailbox(dev);
109 if (IS_ERR(mailbox))
110 return -ENOMEM;
111 mgid = mailbox->buf;
112
113 memcpy(mgid, gid, 16);
114
115 err = mlx4_MGID_HASH(dev, mailbox, hash);
116 mlx4_free_cmd_mailbox(dev, mailbox);
117 if (err)
118 return err;
119
120 if (0)
121 mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
122 "%04x:%04x:%04x:%04x is %04x\n",
123 be16_to_cpu(((__be16 *) gid)[0]),
124 be16_to_cpu(((__be16 *) gid)[1]),
125 be16_to_cpu(((__be16 *) gid)[2]),
126 be16_to_cpu(((__be16 *) gid)[3]),
127 be16_to_cpu(((__be16 *) gid)[4]),
128 be16_to_cpu(((__be16 *) gid)[5]),
129 be16_to_cpu(((__be16 *) gid)[6]),
130 be16_to_cpu(((__be16 *) gid)[7]),
131 *hash);
132
133 *index = *hash;
134 *prev = -1;
135
136 do {
137 err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
138 if (err)
139 return err;
140
141 if (!memcmp(mgm->gid, zero_gid, 16)) {
142 if (*index != *hash) {
143 mlx4_err(dev, "Found zero MGID in AMGM.\n");
144 err = -EINVAL;
145 }
146 return err;
147 }
148
149 if (!memcmp(mgm->gid, gid, 16))
150 return err;
151
152 *prev = *index;
153 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
154 } while (*index);
155
156 *index = -1;
157 return err;
158}
159
160int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
161 int block_mcast_loopback)
162{
163 struct mlx4_priv *priv = mlx4_priv(dev);
164 struct mlx4_cmd_mailbox *mailbox;
165 struct mlx4_mgm *mgm;
166 u32 members_count;
167 u16 hash;
168 int index, prev;
169 int link = 0;
170 int i;
171 int err;
172
173 mailbox = mlx4_alloc_cmd_mailbox(dev);
174 if (IS_ERR(mailbox))
175 return PTR_ERR(mailbox);
176 mgm = mailbox->buf;
177
178 mutex_lock(&priv->mcg_table.mutex);
179
180 err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
181 if (err)
182 goto out;
183
184 if (index != -1) {
185 if (!memcmp(mgm->gid, zero_gid, 16))
186 memcpy(mgm->gid, gid, 16);
187 } else {
188 link = 1;
189
190 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
191 if (index == -1) {
192 mlx4_err(dev, "No AMGM entries left\n");
193 err = -ENOMEM;
194 goto out;
195 }
196 index += dev->caps.num_mgms;
197
198 memset(mgm, 0, sizeof *mgm);
199 memcpy(mgm->gid, gid, 16);
200 }
201
202 members_count = be32_to_cpu(mgm->members_count);
203 if (members_count == MLX4_QP_PER_MGM) {
204 mlx4_err(dev, "MGM at index %x is full.\n", index);
205 err = -ENOMEM;
206 goto out;
207 }
208
209 for (i = 0; i < members_count; ++i)
210 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
211 mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
212 err = 0;
213 goto out;
214 }
215
216 if (block_mcast_loopback)
217 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
218 (1 << MGM_BLCK_LB_BIT));
219 else
220 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
221
222 mgm->members_count = cpu_to_be32(members_count);
223
224 err = mlx4_WRITE_MCG(dev, index, mailbox);
225 if (err)
226 goto out;
227
228 if (!link)
229 goto out;
230
231 err = mlx4_READ_MCG(dev, prev, mailbox);
232 if (err)
233 goto out;
234
235 mgm->next_gid_index = cpu_to_be32(index << 6);
236
237 err = mlx4_WRITE_MCG(dev, prev, mailbox);
238 if (err)
239 goto out;
240
241out:
242 if (err && link && index != -1) {
243 if (index < dev->caps.num_mgms)
244 mlx4_warn(dev, "Got AMGM index %d < %d",
245 index, dev->caps.num_mgms);
246 else
247 mlx4_bitmap_free(&priv->mcg_table.bitmap,
248 index - dev->caps.num_mgms);
249 }
250 mutex_unlock(&priv->mcg_table.mutex);
251
252 mlx4_free_cmd_mailbox(dev, mailbox);
253 return err;
254}
255EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
256
257int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
258{
259 struct mlx4_priv *priv = mlx4_priv(dev);
260 struct mlx4_cmd_mailbox *mailbox;
261 struct mlx4_mgm *mgm;
262 u32 members_count;
263 u16 hash;
264 int prev, index;
265 int i, loc;
266 int err;
267
268 mailbox = mlx4_alloc_cmd_mailbox(dev);
269 if (IS_ERR(mailbox))
270 return PTR_ERR(mailbox);
271 mgm = mailbox->buf;
272
273 mutex_lock(&priv->mcg_table.mutex);
274
275 err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
276 if (err)
277 goto out;
278
279 if (index == -1) {
280 mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
281 "not found\n",
282 be16_to_cpu(((__be16 *) gid)[0]),
283 be16_to_cpu(((__be16 *) gid)[1]),
284 be16_to_cpu(((__be16 *) gid)[2]),
285 be16_to_cpu(((__be16 *) gid)[3]),
286 be16_to_cpu(((__be16 *) gid)[4]),
287 be16_to_cpu(((__be16 *) gid)[5]),
288 be16_to_cpu(((__be16 *) gid)[6]),
289 be16_to_cpu(((__be16 *) gid)[7]));
290 err = -EINVAL;
291 goto out;
292 }
293
294 members_count = be32_to_cpu(mgm->members_count);
295 for (loc = -1, i = 0; i < members_count; ++i)
296 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
297 loc = i;
298
299 if (loc == -1) {
300 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
301 err = -EINVAL;
302 goto out;
303 }
304
305
306 mgm->members_count = cpu_to_be32(--members_count);
307 mgm->qp[loc] = mgm->qp[i - 1];
308 mgm->qp[i - 1] = 0;
309
310 if (i != 1) {
311 err = mlx4_WRITE_MCG(dev, index, mailbox);
312 goto out;
313 }
314
315 if (prev == -1) {
316 /* Remove entry from MGM */
317 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
318 if (amgm_index) {
319 err = mlx4_READ_MCG(dev, amgm_index, mailbox);
320 if (err)
321 goto out;
322 } else
323 memset(mgm->gid, 0, 16);
324
325 err = mlx4_WRITE_MCG(dev, index, mailbox);
326 if (err)
327 goto out;
328
329 if (amgm_index) {
330 if (amgm_index < dev->caps.num_mgms)
331 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
332 index, amgm_index, dev->caps.num_mgms);
333 else
334 mlx4_bitmap_free(&priv->mcg_table.bitmap,
335 amgm_index - dev->caps.num_mgms);
336 }
337 } else {
338 /* Remove entry from AMGM */
339 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
340 err = mlx4_READ_MCG(dev, prev, mailbox);
341 if (err)
342 goto out;
343
344 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
345
346 err = mlx4_WRITE_MCG(dev, prev, mailbox);
347 if (err)
348 goto out;
349
350 if (index < dev->caps.num_mgms)
351 mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
352 prev, index, dev->caps.num_mgms);
353 else
354 mlx4_bitmap_free(&priv->mcg_table.bitmap,
355 index - dev->caps.num_mgms);
356 }
357
358out:
359 mutex_unlock(&priv->mcg_table.mutex);
360
361 mlx4_free_cmd_mailbox(dev, mailbox);
362 return err;
363}
364EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
365
366int mlx4_init_mcg_table(struct mlx4_dev *dev)
367{
368 struct mlx4_priv *priv = mlx4_priv(dev);
369 int err;
370
371 err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
372 dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
373 if (err)
374 return err;
375
376 mutex_init(&priv->mcg_table.mutex);
377
378 return 0;
379}
380
381void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
382{
383 mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);
384}