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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 | ||
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 | ||
521e575b RL |
42 | #define MGM_QPN_MASK 0x00FFFFFF |
43 | #define MGM_BLCK_LB_BIT 30 | |
44 | ||
225c7b1f RD |
45 | struct 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 | ||
53 | static const u8 zero_gid[16]; /* automatically initialized to 0 */ | |
54 | ||
55 | static 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 | ||
62 | static 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 | ||
69 | static 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 | */ | |
99 | static 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) | |
5b095d98 | 121 | mlx4_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash); |
225c7b1f RD |
122 | |
123 | *index = *hash; | |
124 | *prev = -1; | |
125 | ||
126 | do { | |
127 | err = mlx4_READ_MCG(dev, *index, mgm_mailbox); | |
128 | if (err) | |
129 | return err; | |
130 | ||
131 | if (!memcmp(mgm->gid, zero_gid, 16)) { | |
132 | if (*index != *hash) { | |
133 | mlx4_err(dev, "Found zero MGID in AMGM.\n"); | |
134 | err = -EINVAL; | |
135 | } | |
136 | return err; | |
137 | } | |
138 | ||
139 | if (!memcmp(mgm->gid, gid, 16)) | |
140 | return err; | |
141 | ||
142 | *prev = *index; | |
143 | *index = be32_to_cpu(mgm->next_gid_index) >> 6; | |
144 | } while (*index); | |
145 | ||
146 | *index = -1; | |
147 | return err; | |
148 | } | |
149 | ||
521e575b RL |
150 | int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16], |
151 | int block_mcast_loopback) | |
225c7b1f RD |
152 | { |
153 | struct mlx4_priv *priv = mlx4_priv(dev); | |
154 | struct mlx4_cmd_mailbox *mailbox; | |
155 | struct mlx4_mgm *mgm; | |
156 | u32 members_count; | |
157 | u16 hash; | |
158 | int index, prev; | |
159 | int link = 0; | |
160 | int i; | |
161 | int err; | |
162 | ||
163 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
164 | if (IS_ERR(mailbox)) | |
165 | return PTR_ERR(mailbox); | |
166 | mgm = mailbox->buf; | |
167 | ||
168 | mutex_lock(&priv->mcg_table.mutex); | |
169 | ||
170 | err = find_mgm(dev, gid, mailbox, &hash, &prev, &index); | |
171 | if (err) | |
172 | goto out; | |
173 | ||
174 | if (index != -1) { | |
175 | if (!memcmp(mgm->gid, zero_gid, 16)) | |
176 | memcpy(mgm->gid, gid, 16); | |
177 | } else { | |
178 | link = 1; | |
179 | ||
180 | index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap); | |
181 | if (index == -1) { | |
182 | mlx4_err(dev, "No AMGM entries left\n"); | |
183 | err = -ENOMEM; | |
184 | goto out; | |
185 | } | |
186 | index += dev->caps.num_mgms; | |
187 | ||
225c7b1f RD |
188 | memset(mgm, 0, sizeof *mgm); |
189 | memcpy(mgm->gid, gid, 16); | |
190 | } | |
191 | ||
192 | members_count = be32_to_cpu(mgm->members_count); | |
193 | if (members_count == MLX4_QP_PER_MGM) { | |
194 | mlx4_err(dev, "MGM at index %x is full.\n", index); | |
195 | err = -ENOMEM; | |
196 | goto out; | |
197 | } | |
198 | ||
199 | for (i = 0; i < members_count; ++i) | |
521e575b | 200 | if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) { |
225c7b1f RD |
201 | mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn); |
202 | err = 0; | |
203 | goto out; | |
204 | } | |
205 | ||
521e575b RL |
206 | if (block_mcast_loopback) |
207 | mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) | | |
208 | (1 << MGM_BLCK_LB_BIT)); | |
209 | else | |
210 | mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK); | |
211 | ||
225c7b1f RD |
212 | mgm->members_count = cpu_to_be32(members_count); |
213 | ||
214 | err = mlx4_WRITE_MCG(dev, index, mailbox); | |
215 | if (err) | |
216 | goto out; | |
217 | ||
218 | if (!link) | |
219 | goto out; | |
220 | ||
221 | err = mlx4_READ_MCG(dev, prev, mailbox); | |
222 | if (err) | |
223 | goto out; | |
224 | ||
225 | mgm->next_gid_index = cpu_to_be32(index << 6); | |
226 | ||
227 | err = mlx4_WRITE_MCG(dev, prev, mailbox); | |
228 | if (err) | |
229 | goto out; | |
230 | ||
231 | out: | |
232 | if (err && link && index != -1) { | |
233 | if (index < dev->caps.num_mgms) | |
234 | mlx4_warn(dev, "Got AMGM index %d < %d", | |
235 | index, dev->caps.num_mgms); | |
236 | else | |
237 | mlx4_bitmap_free(&priv->mcg_table.bitmap, | |
238 | index - dev->caps.num_mgms); | |
239 | } | |
240 | mutex_unlock(&priv->mcg_table.mutex); | |
241 | ||
242 | mlx4_free_cmd_mailbox(dev, mailbox); | |
243 | return err; | |
244 | } | |
245 | EXPORT_SYMBOL_GPL(mlx4_multicast_attach); | |
246 | ||
247 | int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16]) | |
248 | { | |
249 | struct mlx4_priv *priv = mlx4_priv(dev); | |
250 | struct mlx4_cmd_mailbox *mailbox; | |
251 | struct mlx4_mgm *mgm; | |
252 | u32 members_count; | |
253 | u16 hash; | |
254 | int prev, index; | |
255 | int i, loc; | |
256 | int err; | |
257 | ||
258 | mailbox = mlx4_alloc_cmd_mailbox(dev); | |
259 | if (IS_ERR(mailbox)) | |
260 | return PTR_ERR(mailbox); | |
261 | mgm = mailbox->buf; | |
262 | ||
263 | mutex_lock(&priv->mcg_table.mutex); | |
264 | ||
265 | err = find_mgm(dev, gid, mailbox, &hash, &prev, &index); | |
266 | if (err) | |
267 | goto out; | |
268 | ||
269 | if (index == -1) { | |
5b095d98 | 270 | mlx4_err(dev, "MGID %pI6 not found\n", gid); |
225c7b1f RD |
271 | err = -EINVAL; |
272 | goto out; | |
273 | } | |
274 | ||
275 | members_count = be32_to_cpu(mgm->members_count); | |
276 | for (loc = -1, i = 0; i < members_count; ++i) | |
521e575b | 277 | if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) |
225c7b1f RD |
278 | loc = i; |
279 | ||
280 | if (loc == -1) { | |
281 | mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn); | |
282 | err = -EINVAL; | |
283 | goto out; | |
284 | } | |
285 | ||
286 | ||
287 | mgm->members_count = cpu_to_be32(--members_count); | |
288 | mgm->qp[loc] = mgm->qp[i - 1]; | |
289 | mgm->qp[i - 1] = 0; | |
290 | ||
4dc51b32 EC |
291 | if (i != 1) { |
292 | err = mlx4_WRITE_MCG(dev, index, mailbox); | |
225c7b1f | 293 | goto out; |
4dc51b32 | 294 | } |
225c7b1f RD |
295 | |
296 | if (prev == -1) { | |
297 | /* Remove entry from MGM */ | |
298 | int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6; | |
299 | if (amgm_index) { | |
300 | err = mlx4_READ_MCG(dev, amgm_index, mailbox); | |
301 | if (err) | |
302 | goto out; | |
303 | } else | |
304 | memset(mgm->gid, 0, 16); | |
305 | ||
306 | err = mlx4_WRITE_MCG(dev, index, mailbox); | |
307 | if (err) | |
308 | goto out; | |
309 | ||
310 | if (amgm_index) { | |
311 | if (amgm_index < dev->caps.num_mgms) | |
312 | mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d", | |
313 | index, amgm_index, dev->caps.num_mgms); | |
314 | else | |
315 | mlx4_bitmap_free(&priv->mcg_table.bitmap, | |
316 | amgm_index - dev->caps.num_mgms); | |
317 | } | |
318 | } else { | |
319 | /* Remove entry from AMGM */ | |
320 | int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6; | |
321 | err = mlx4_READ_MCG(dev, prev, mailbox); | |
322 | if (err) | |
323 | goto out; | |
324 | ||
325 | mgm->next_gid_index = cpu_to_be32(cur_next_index << 6); | |
326 | ||
327 | err = mlx4_WRITE_MCG(dev, prev, mailbox); | |
328 | if (err) | |
329 | goto out; | |
330 | ||
331 | if (index < dev->caps.num_mgms) | |
332 | mlx4_warn(dev, "entry %d had next AMGM index %d < %d", | |
333 | prev, index, dev->caps.num_mgms); | |
334 | else | |
335 | mlx4_bitmap_free(&priv->mcg_table.bitmap, | |
336 | index - dev->caps.num_mgms); | |
337 | } | |
338 | ||
339 | out: | |
340 | mutex_unlock(&priv->mcg_table.mutex); | |
341 | ||
342 | mlx4_free_cmd_mailbox(dev, mailbox); | |
343 | return err; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(mlx4_multicast_detach); | |
346 | ||
3d73c288 | 347 | int mlx4_init_mcg_table(struct mlx4_dev *dev) |
225c7b1f RD |
348 | { |
349 | struct mlx4_priv *priv = mlx4_priv(dev); | |
350 | int err; | |
351 | ||
93fc9e1b YP |
352 | err = mlx4_bitmap_init(&priv->mcg_table.bitmap, dev->caps.num_amgms, |
353 | dev->caps.num_amgms - 1, 0, 0); | |
225c7b1f RD |
354 | if (err) |
355 | return err; | |
356 | ||
357 | mutex_init(&priv->mcg_table.mutex); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | void mlx4_cleanup_mcg_table(struct mlx4_dev *dev) | |
363 | { | |
364 | mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap); | |
365 | } |