2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/string.h>
34 #include <linux/slab.h>
36 #include "mthca_dev.h"
37 #include "mthca_cmd.h"
40 __be32 next_gid_index;
43 __be32 qp[MTHCA_QP_PER_MGM];
46 static const u8 zero_gid[16]; /* automatically initialized to 0 */
49 * Caller must hold MCG table semaphore. gid and mgm parameters must
50 * be properly aligned for command interface.
52 * Returns 0 unless a firmware command error occurs.
54 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
55 * and *mgm holds MGM entry.
57 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
58 * previous entry in hash chain and *mgm holds AMGM entry.
60 * If no AMGM exists for given gid, *index = -1, *prev = index of last
61 * entry in hash chain and *mgm holds end of hash chain.
63 static int find_mgm(struct mthca_dev *dev,
64 u8 *gid, struct mthca_mailbox *mgm_mailbox,
65 u16 *hash, int *prev, int *index)
67 struct mthca_mailbox *mailbox;
68 struct mthca_mgm *mgm = mgm_mailbox->buf;
73 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
78 memcpy(mgid, gid, 16);
80 err = mthca_MGID_HASH(dev, mailbox, hash, &status);
84 mthca_err(dev, "MGID_HASH returned status %02x\n", status);
90 mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
91 "%04x:%04x:%04x:%04x is %04x\n",
92 be16_to_cpu(((__be16 *) gid)[0]),
93 be16_to_cpu(((__be16 *) gid)[1]),
94 be16_to_cpu(((__be16 *) gid)[2]),
95 be16_to_cpu(((__be16 *) gid)[3]),
96 be16_to_cpu(((__be16 *) gid)[4]),
97 be16_to_cpu(((__be16 *) gid)[5]),
98 be16_to_cpu(((__be16 *) gid)[6]),
99 be16_to_cpu(((__be16 *) gid)[7]),
106 err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
110 mthca_err(dev, "READ_MGM returned status %02x\n", status);
115 if (!memcmp(mgm->gid, zero_gid, 16)) {
116 if (*index != *hash) {
117 mthca_err(dev, "Found zero MGID in AMGM.\n");
123 if (!memcmp(mgm->gid, gid, 16))
127 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
133 mthca_free_mailbox(dev, mailbox);
137 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
139 struct mthca_dev *dev = to_mdev(ibqp->device);
140 struct mthca_mailbox *mailbox;
141 struct mthca_mgm *mgm;
149 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
151 return PTR_ERR(mailbox);
154 mutex_lock(&dev->mcg_table.mutex);
156 err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
161 if (!memcmp(mgm->gid, zero_gid, 16))
162 memcpy(mgm->gid, gid->raw, 16);
166 index = mthca_alloc(&dev->mcg_table.alloc);
168 mthca_err(dev, "No AMGM entries left\n");
173 err = mthca_READ_MGM(dev, index, mailbox, &status);
177 mthca_err(dev, "READ_MGM returned status %02x\n", status);
181 memset(mgm, 0, sizeof *mgm);
182 memcpy(mgm->gid, gid->raw, 16);
185 for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
186 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
187 mthca_dbg(dev, "QP %06x already a member of MGM\n",
191 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
192 mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
196 if (i == MTHCA_QP_PER_MGM) {
197 mthca_err(dev, "MGM at index %x is full.\n", index);
202 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
206 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
214 err = mthca_READ_MGM(dev, prev, mailbox, &status);
218 mthca_err(dev, "READ_MGM returned status %02x\n", status);
223 mgm->next_gid_index = cpu_to_be32(index << 6);
225 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
229 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
234 if (err && link && index != -1) {
235 BUG_ON(index < dev->limits.num_mgms);
236 mthca_free(&dev->mcg_table.alloc, index);
238 mutex_unlock(&dev->mcg_table.mutex);
240 mthca_free_mailbox(dev, mailbox);
244 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
246 struct mthca_dev *dev = to_mdev(ibqp->device);
247 struct mthca_mailbox *mailbox;
248 struct mthca_mgm *mgm;
255 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
257 return PTR_ERR(mailbox);
260 mutex_lock(&dev->mcg_table.mutex);
262 err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
267 mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
269 be16_to_cpu(((__be16 *) gid->raw)[0]),
270 be16_to_cpu(((__be16 *) gid->raw)[1]),
271 be16_to_cpu(((__be16 *) gid->raw)[2]),
272 be16_to_cpu(((__be16 *) gid->raw)[3]),
273 be16_to_cpu(((__be16 *) gid->raw)[4]),
274 be16_to_cpu(((__be16 *) gid->raw)[5]),
275 be16_to_cpu(((__be16 *) gid->raw)[6]),
276 be16_to_cpu(((__be16 *) gid->raw)[7]));
281 for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
282 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
284 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
289 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
294 mgm->qp[loc] = mgm->qp[i - 1];
297 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
301 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
310 /* Remove entry from MGM */
311 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
312 if (amgm_index_to_free) {
313 err = mthca_READ_MGM(dev, amgm_index_to_free,
318 mthca_err(dev, "READ_MGM returned status %02x\n",
324 memset(mgm->gid, 0, 16);
326 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
330 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
334 if (amgm_index_to_free) {
335 BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
336 mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
339 /* Remove entry from AMGM */
340 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
341 err = mthca_READ_MGM(dev, prev, mailbox, &status);
345 mthca_err(dev, "READ_MGM returned status %02x\n", status);
350 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
352 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
356 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
360 BUG_ON(index < dev->limits.num_mgms);
361 mthca_free(&dev->mcg_table.alloc, index);
365 mutex_unlock(&dev->mcg_table.mutex);
367 mthca_free_mailbox(dev, mailbox);
371 int mthca_init_mcg_table(struct mthca_dev *dev)
374 int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
376 err = mthca_alloc_init(&dev->mcg_table.alloc,
379 dev->limits.num_mgms);
383 mutex_init(&dev->mcg_table.mutex);
388 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
390 mthca_alloc_cleanup(&dev->mcg_table.alloc);