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
32 * $Id: mthca_mcg.c 1349 2004-12-16 21:09:43Z roland $
35 #include <linux/init.h>
36 #include <linux/string.h>
37 #include <linux/slab.h>
39 #include "mthca_dev.h"
40 #include "mthca_cmd.h"
43 __be32 next_gid_index;
46 __be32 qp[MTHCA_QP_PER_MGM];
49 static const u8 zero_gid[16]; /* automatically initialized to 0 */
52 * Caller must hold MCG table semaphore. gid and mgm parameters must
53 * be properly aligned for command interface.
55 * Returns 0 unless a firmware command error occurs.
57 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
58 * and *mgm holds MGM entry.
60 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
61 * previous entry in hash chain and *mgm holds AMGM entry.
63 * If no AMGM exists for given gid, *index = -1, *prev = index of last
64 * entry in hash chain and *mgm holds end of hash chain.
66 static int find_mgm(struct mthca_dev *dev,
67 u8 *gid, struct mthca_mailbox *mgm_mailbox,
68 u16 *hash, int *prev, int *index)
70 struct mthca_mailbox *mailbox;
71 struct mthca_mgm *mgm = mgm_mailbox->buf;
76 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
81 memcpy(mgid, gid, 16);
83 err = mthca_MGID_HASH(dev, mailbox, hash, &status);
87 mthca_err(dev, "MGID_HASH returned status %02x\n", status);
93 mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
94 "%04x:%04x:%04x:%04x is %04x\n",
95 be16_to_cpu(((__be16 *) gid)[0]),
96 be16_to_cpu(((__be16 *) gid)[1]),
97 be16_to_cpu(((__be16 *) gid)[2]),
98 be16_to_cpu(((__be16 *) gid)[3]),
99 be16_to_cpu(((__be16 *) gid)[4]),
100 be16_to_cpu(((__be16 *) gid)[5]),
101 be16_to_cpu(((__be16 *) gid)[6]),
102 be16_to_cpu(((__be16 *) gid)[7]),
109 err = mthca_READ_MGM(dev, *index, mgm_mailbox, &status);
113 mthca_err(dev, "READ_MGM returned status %02x\n", status);
118 if (!memcmp(mgm->gid, zero_gid, 16)) {
119 if (*index != *hash) {
120 mthca_err(dev, "Found zero MGID in AMGM.\n");
126 if (!memcmp(mgm->gid, gid, 16))
130 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
136 mthca_free_mailbox(dev, mailbox);
140 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
142 struct mthca_dev *dev = to_mdev(ibqp->device);
143 struct mthca_mailbox *mailbox;
144 struct mthca_mgm *mgm;
152 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
154 return PTR_ERR(mailbox);
157 mutex_lock(&dev->mcg_table.mutex);
159 err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
164 if (!memcmp(mgm->gid, zero_gid, 16))
165 memcpy(mgm->gid, gid->raw, 16);
169 index = mthca_alloc(&dev->mcg_table.alloc);
171 mthca_err(dev, "No AMGM entries left\n");
176 err = mthca_READ_MGM(dev, index, mailbox, &status);
180 mthca_err(dev, "READ_MGM returned status %02x\n", status);
184 memset(mgm, 0, sizeof *mgm);
185 memcpy(mgm->gid, gid->raw, 16);
188 for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
189 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
190 mthca_dbg(dev, "QP %06x already a member of MGM\n",
194 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
195 mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
199 if (i == MTHCA_QP_PER_MGM) {
200 mthca_err(dev, "MGM at index %x is full.\n", index);
205 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
209 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
217 err = mthca_READ_MGM(dev, prev, mailbox, &status);
221 mthca_err(dev, "READ_MGM returned status %02x\n", status);
226 mgm->next_gid_index = cpu_to_be32(index << 6);
228 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
232 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
237 if (err && link && index != -1) {
238 BUG_ON(index < dev->limits.num_mgms);
239 mthca_free(&dev->mcg_table.alloc, index);
241 mutex_unlock(&dev->mcg_table.mutex);
243 mthca_free_mailbox(dev, mailbox);
247 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
249 struct mthca_dev *dev = to_mdev(ibqp->device);
250 struct mthca_mailbox *mailbox;
251 struct mthca_mgm *mgm;
258 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
260 return PTR_ERR(mailbox);
263 mutex_lock(&dev->mcg_table.mutex);
265 err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
270 mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
272 be16_to_cpu(((__be16 *) gid->raw)[0]),
273 be16_to_cpu(((__be16 *) gid->raw)[1]),
274 be16_to_cpu(((__be16 *) gid->raw)[2]),
275 be16_to_cpu(((__be16 *) gid->raw)[3]),
276 be16_to_cpu(((__be16 *) gid->raw)[4]),
277 be16_to_cpu(((__be16 *) gid->raw)[5]),
278 be16_to_cpu(((__be16 *) gid->raw)[6]),
279 be16_to_cpu(((__be16 *) gid->raw)[7]));
284 for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
285 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
287 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
292 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
297 mgm->qp[loc] = mgm->qp[i - 1];
300 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
304 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
313 /* Remove entry from MGM */
314 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
315 if (amgm_index_to_free) {
316 err = mthca_READ_MGM(dev, amgm_index_to_free,
321 mthca_err(dev, "READ_MGM returned status %02x\n",
327 memset(mgm->gid, 0, 16);
329 err = mthca_WRITE_MGM(dev, index, mailbox, &status);
333 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
337 if (amgm_index_to_free) {
338 BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
339 mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
342 /* Remove entry from AMGM */
343 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
344 err = mthca_READ_MGM(dev, prev, mailbox, &status);
348 mthca_err(dev, "READ_MGM returned status %02x\n", status);
353 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
355 err = mthca_WRITE_MGM(dev, prev, mailbox, &status);
359 mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
363 BUG_ON(index < dev->limits.num_mgms);
364 mthca_free(&dev->mcg_table.alloc, index);
368 mutex_unlock(&dev->mcg_table.mutex);
370 mthca_free_mailbox(dev, mailbox);
374 int __devinit mthca_init_mcg_table(struct mthca_dev *dev)
377 int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
379 err = mthca_alloc_init(&dev->mcg_table.alloc,
382 dev->limits.num_mgms);
386 mutex_init(&dev->mcg_table.mutex);
391 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
393 mthca_alloc_cleanup(&dev->mcg_table.alloc);