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225c7b1f RD |
1 | /* |
2 | * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved. | |
51a379d0 | 3 | * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. |
225c7b1f RD |
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 | ||
225c7b1f RD |
34 | #include <linux/string.h> |
35 | #include <linux/slab.h> | |
36 | ||
37 | #include <linux/mlx4/cmd.h> | |
38 | ||
39 | #include "mlx4.h" | |
40 | ||
521e575b RL |
41 | #define MGM_QPN_MASK 0x00FFFFFF |
42 | #define MGM_BLCK_LB_BIT 30 | |
43 | ||
225c7b1f RD |
44 | struct mlx4_mgm { |
45 | __be32 next_gid_index; | |
46 | __be32 members_count; | |
47 | u32 reserved[2]; | |
48 | u8 gid[16]; | |
49 | __be32 qp[MLX4_QP_PER_MGM]; | |
50 | }; | |
51 | ||
52 | static const u8 zero_gid[16]; /* automatically initialized to 0 */ | |
53 | ||
54 | static int mlx4_READ_MCG(struct mlx4_dev *dev, int index, | |
55 | struct mlx4_cmd_mailbox *mailbox) | |
56 | { | |
57 | return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG, | |
58 | MLX4_CMD_TIME_CLASS_A); | |
59 | } | |
60 | ||
61 | static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index, | |
62 | struct mlx4_cmd_mailbox *mailbox) | |
63 | { | |
64 | return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG, | |
65 | MLX4_CMD_TIME_CLASS_A); | |
66 | } | |
67 | ||
68 | static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox, | |
69 | u16 *hash) | |
70 | { | |
71 | u64 imm; | |
72 | int err; | |
73 | ||
74 | err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH, | |
75 | MLX4_CMD_TIME_CLASS_A); | |
76 | ||
77 | if (!err) | |
78 | *hash = imm; | |
79 | ||
80 | return err; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Caller must hold MCG table semaphore. gid and mgm parameters must | |
85 | * be properly aligned for command interface. | |
86 | * | |
87 | * Returns 0 unless a firmware command error occurs. | |
88 | * | |
89 | * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1 | |
90 | * and *mgm holds MGM entry. | |
91 | * | |
92 | * if GID is found in AMGM, *index = index in AMGM, *prev = index of | |
93 | * previous entry in hash chain and *mgm holds AMGM entry. | |
94 | * | |
95 | * If no AMGM exists for given gid, *index = -1, *prev = index of last | |
96 | * entry in hash chain and *mgm holds end of hash chain. | |
97 | */ | |
98 | static int find_mgm(struct mlx4_dev *dev, | |
99 | u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox, | |
100 | u16 *hash, int *prev, int *index) | |
101 | { | |
102 | struct mlx4_cmd_mailbox *mailbox; | |
103 | struct mlx4_mgm *mgm = mgm_mailbox->buf; | |
104 | u8 *mgid; | |
105 | int err; | |
106 | ||
107 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
108 | if (IS_ERR(mailbox)) | |
109 | return -ENOMEM; | |
110 | mgid = mailbox->buf; | |
111 | ||
112 | memcpy(mgid, gid, 16); | |
113 | ||
114 | err = mlx4_MGID_HASH(dev, mailbox, hash); | |
115 | mlx4_free_cmd_mailbox(dev, mailbox); | |
116 | if (err) | |
117 | return err; | |
118 | ||
119 | if (0) | |
5b095d98 | 120 | mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash); |
225c7b1f RD |
121 | |
122 | *index = *hash; | |
123 | *prev = -1; | |
124 | ||
125 | do { | |
126 | err = mlx4_READ_MCG(dev, *index, mgm_mailbox); | |
127 | if (err) | |
128 | return err; | |
129 | ||
130 | if (!memcmp(mgm->gid, zero_gid, 16)) { | |
131 | if (*index != *hash) { | |
132 | mlx4_err(dev, "Found zero MGID in AMGM.\n"); | |
133 | err = -EINVAL; | |
134 | } | |
135 | return err; | |
136 | } | |
137 | ||
138 | if (!memcmp(mgm->gid, gid, 16)) | |
139 | return err; | |
140 | ||
141 | *prev = *index; | |
142 | *index = be32_to_cpu(mgm->next_gid_index) >> 6; | |
143 | } while (*index); | |
144 | ||
145 | *index = -1; | |
146 | return err; | |
147 | } | |
148 | ||
521e575b RL |
149 | int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16], |
150 | int block_mcast_loopback) | |
225c7b1f RD |
151 | { |
152 | struct mlx4_priv *priv = mlx4_priv(dev); | |
153 | struct mlx4_cmd_mailbox *mailbox; | |
154 | struct mlx4_mgm *mgm; | |
155 | u32 members_count; | |
156 | u16 hash; | |
157 | int index, prev; | |
158 | int link = 0; | |
159 | int i; | |
160 | int err; | |
161 | ||
162 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
163 | if (IS_ERR(mailbox)) | |
164 | return PTR_ERR(mailbox); | |
165 | mgm = mailbox->buf; | |
166 | ||
167 | mutex_lock(&priv->mcg_table.mutex); | |
168 | ||
169 | err = find_mgm(dev, gid, mailbox, &hash, &prev, &index); | |
170 | if (err) | |
171 | goto out; | |
172 | ||
173 | if (index != -1) { | |
174 | if (!memcmp(mgm->gid, zero_gid, 16)) | |
175 | memcpy(mgm->gid, gid, 16); | |
176 | } else { | |
177 | link = 1; | |
178 | ||
179 | index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap); | |
180 | if (index == -1) { | |
181 | mlx4_err(dev, "No AMGM entries left\n"); | |
182 | err = -ENOMEM; | |
183 | goto out; | |
184 | } | |
185 | index += dev->caps.num_mgms; | |
186 | ||
225c7b1f RD |
187 | memset(mgm, 0, sizeof *mgm); |
188 | memcpy(mgm->gid, gid, 16); | |
189 | } | |
190 | ||
191 | members_count = be32_to_cpu(mgm->members_count); | |
192 | if (members_count == MLX4_QP_PER_MGM) { | |
193 | mlx4_err(dev, "MGM at index %x is full.\n", index); | |
194 | err = -ENOMEM; | |
195 | goto out; | |
196 | } | |
197 | ||
198 | for (i = 0; i < members_count; ++i) | |
521e575b | 199 | if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) { |
225c7b1f RD |
200 | mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn); |
201 | err = 0; | |
202 | goto out; | |
203 | } | |
204 | ||
521e575b RL |
205 | if (block_mcast_loopback) |
206 | mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) | | |
e6a17622 | 207 | (1U << MGM_BLCK_LB_BIT)); |
521e575b RL |
208 | else |
209 | mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK); | |
210 | ||
225c7b1f RD |
211 | mgm->members_count = cpu_to_be32(members_count); |
212 | ||
213 | err = mlx4_WRITE_MCG(dev, index, mailbox); | |
214 | if (err) | |
215 | goto out; | |
216 | ||
217 | if (!link) | |
218 | goto out; | |
219 | ||
220 | err = mlx4_READ_MCG(dev, prev, mailbox); | |
221 | if (err) | |
222 | goto out; | |
223 | ||
224 | mgm->next_gid_index = cpu_to_be32(index << 6); | |
225 | ||
226 | err = mlx4_WRITE_MCG(dev, prev, mailbox); | |
227 | if (err) | |
228 | goto out; | |
229 | ||
230 | out: | |
231 | if (err && link && index != -1) { | |
232 | if (index < dev->caps.num_mgms) | |
233 | mlx4_warn(dev, "Got AMGM index %d < %d", | |
234 | index, dev->caps.num_mgms); | |
235 | else | |
236 | mlx4_bitmap_free(&priv->mcg_table.bitmap, | |
237 | index - dev->caps.num_mgms); | |
238 | } | |
239 | mutex_unlock(&priv->mcg_table.mutex); | |
240 | ||
241 | mlx4_free_cmd_mailbox(dev, mailbox); | |
242 | return err; | |
243 | } | |
244 | EXPORT_SYMBOL_GPL(mlx4_multicast_attach); | |
245 | ||
246 | int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16]) | |
247 | { | |
248 | struct mlx4_priv *priv = mlx4_priv(dev); | |
249 | struct mlx4_cmd_mailbox *mailbox; | |
250 | struct mlx4_mgm *mgm; | |
251 | u32 members_count; | |
252 | u16 hash; | |
253 | int prev, index; | |
254 | int i, loc; | |
255 | int err; | |
256 | ||
257 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
258 | if (IS_ERR(mailbox)) | |
259 | return PTR_ERR(mailbox); | |
260 | mgm = mailbox->buf; | |
261 | ||
262 | mutex_lock(&priv->mcg_table.mutex); | |
263 | ||
264 | err = find_mgm(dev, gid, mailbox, &hash, &prev, &index); | |
265 | if (err) | |
266 | goto out; | |
267 | ||
268 | if (index == -1) { | |
5b095d98 | 269 | mlx4_err(dev, "MGID %pI6 not found\n", gid); |
225c7b1f RD |
270 | err = -EINVAL; |
271 | goto out; | |
272 | } | |
273 | ||
274 | members_count = be32_to_cpu(mgm->members_count); | |
275 | for (loc = -1, i = 0; i < members_count; ++i) | |
521e575b | 276 | if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) |
225c7b1f RD |
277 | loc = i; |
278 | ||
279 | if (loc == -1) { | |
280 | mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn); | |
281 | err = -EINVAL; | |
282 | goto out; | |
283 | } | |
284 | ||
285 | ||
286 | mgm->members_count = cpu_to_be32(--members_count); | |
287 | mgm->qp[loc] = mgm->qp[i - 1]; | |
288 | mgm->qp[i - 1] = 0; | |
289 | ||
4dc51b32 EC |
290 | if (i != 1) { |
291 | err = mlx4_WRITE_MCG(dev, index, mailbox); | |
225c7b1f | 292 | goto out; |
4dc51b32 | 293 | } |
225c7b1f RD |
294 | |
295 | if (prev == -1) { | |
296 | /* Remove entry from MGM */ | |
297 | int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6; | |
298 | if (amgm_index) { | |
299 | err = mlx4_READ_MCG(dev, amgm_index, mailbox); | |
300 | if (err) | |
301 | goto out; | |
302 | } else | |
303 | memset(mgm->gid, 0, 16); | |
304 | ||
305 | err = mlx4_WRITE_MCG(dev, index, mailbox); | |
306 | if (err) | |
307 | goto out; | |
308 | ||
309 | if (amgm_index) { | |
310 | if (amgm_index < dev->caps.num_mgms) | |
311 | mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d", | |
312 | index, amgm_index, dev->caps.num_mgms); | |
313 | else | |
314 | mlx4_bitmap_free(&priv->mcg_table.bitmap, | |
315 | amgm_index - dev->caps.num_mgms); | |
316 | } | |
317 | } else { | |
318 | /* Remove entry from AMGM */ | |
319 | int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6; | |
320 | err = mlx4_READ_MCG(dev, prev, mailbox); | |
321 | if (err) | |
322 | goto out; | |
323 | ||
324 | mgm->next_gid_index = cpu_to_be32(cur_next_index << 6); | |
325 | ||
326 | err = mlx4_WRITE_MCG(dev, prev, mailbox); | |
327 | if (err) | |
328 | goto out; | |
329 | ||
330 | if (index < dev->caps.num_mgms) | |
331 | mlx4_warn(dev, "entry %d had next AMGM index %d < %d", | |
332 | prev, index, dev->caps.num_mgms); | |
333 | else | |
334 | mlx4_bitmap_free(&priv->mcg_table.bitmap, | |
335 | index - dev->caps.num_mgms); | |
336 | } | |
337 | ||
338 | out: | |
339 | mutex_unlock(&priv->mcg_table.mutex); | |
340 | ||
341 | mlx4_free_cmd_mailbox(dev, mailbox); | |
342 | return err; | |
343 | } | |
344 | EXPORT_SYMBOL_GPL(mlx4_multicast_detach); | |
345 | ||
3d73c288 | 346 | int mlx4_init_mcg_table(struct mlx4_dev *dev) |
225c7b1f RD |
347 | { |
348 | struct mlx4_priv *priv = mlx4_priv(dev); | |
349 | int err; | |
350 | ||
93fc9e1b YP |
351 | err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms, |
352 | dev->caps.num_amgms - 1, 0, 0); | |
225c7b1f RD |
353 | if (err) |
354 | return err; | |
355 | ||
356 | mutex_init(&priv->mcg_table.mutex); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | void mlx4_cleanup_mcg_table(struct mlx4_dev *dev) | |
362 | { | |
363 | mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap); | |
364 | } |