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/gfp.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;
72 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
77 memcpy(mgid, gid, 16);
79 err = mthca_MGID_HASH(dev, mailbox, hash);
81 mthca_err(dev, "MGID_HASH failed (%d)\n", err);
86 mthca_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
92 err = mthca_READ_MGM(dev, *index, mgm_mailbox);
94 mthca_err(dev, "READ_MGM failed (%d)\n", err);
98 if (!memcmp(mgm->gid, zero_gid, 16)) {
99 if (*index != *hash) {
100 mthca_err(dev, "Found zero MGID in AMGM.\n");
106 if (!memcmp(mgm->gid, gid, 16))
110 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
116 mthca_free_mailbox(dev, mailbox);
120 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
122 struct mthca_dev *dev = to_mdev(ibqp->device);
123 struct mthca_mailbox *mailbox;
124 struct mthca_mgm *mgm;
131 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
133 return PTR_ERR(mailbox);
136 mutex_lock(&dev->mcg_table.mutex);
138 err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
143 if (!memcmp(mgm->gid, zero_gid, 16))
144 memcpy(mgm->gid, gid->raw, 16);
148 index = mthca_alloc(&dev->mcg_table.alloc);
150 mthca_err(dev, "No AMGM entries left\n");
155 err = mthca_READ_MGM(dev, index, mailbox);
157 mthca_err(dev, "READ_MGM failed (%d)\n", err);
160 memset(mgm, 0, sizeof *mgm);
161 memcpy(mgm->gid, gid->raw, 16);
164 for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
165 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
166 mthca_dbg(dev, "QP %06x already a member of MGM\n",
170 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
171 mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
175 if (i == MTHCA_QP_PER_MGM) {
176 mthca_err(dev, "MGM at index %x is full.\n", index);
181 err = mthca_WRITE_MGM(dev, index, mailbox);
183 mthca_err(dev, "WRITE_MGM failed %d\n", err);
191 err = mthca_READ_MGM(dev, prev, mailbox);
193 mthca_err(dev, "READ_MGM failed %d\n", err);
197 mgm->next_gid_index = cpu_to_be32(index << 6);
199 err = mthca_WRITE_MGM(dev, prev, mailbox);
201 mthca_err(dev, "WRITE_MGM returned %d\n", err);
204 if (err && link && index != -1) {
205 BUG_ON(index < dev->limits.num_mgms);
206 mthca_free(&dev->mcg_table.alloc, index);
208 mutex_unlock(&dev->mcg_table.mutex);
210 mthca_free_mailbox(dev, mailbox);
214 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
216 struct mthca_dev *dev = to_mdev(ibqp->device);
217 struct mthca_mailbox *mailbox;
218 struct mthca_mgm *mgm;
224 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
226 return PTR_ERR(mailbox);
229 mutex_lock(&dev->mcg_table.mutex);
231 err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
236 mthca_err(dev, "MGID %pI6 not found\n", gid->raw);
241 for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
242 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
244 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
249 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
254 mgm->qp[loc] = mgm->qp[i - 1];
257 err = mthca_WRITE_MGM(dev, index, mailbox);
259 mthca_err(dev, "WRITE_MGM returned %d\n", err);
267 /* Remove entry from MGM */
268 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
269 if (amgm_index_to_free) {
270 err = mthca_READ_MGM(dev, amgm_index_to_free,
273 mthca_err(dev, "READ_MGM returned %d\n", err);
277 memset(mgm->gid, 0, 16);
279 err = mthca_WRITE_MGM(dev, index, mailbox);
281 mthca_err(dev, "WRITE_MGM returned %d\n", err);
284 if (amgm_index_to_free) {
285 BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
286 mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
289 /* Remove entry from AMGM */
290 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
291 err = mthca_READ_MGM(dev, prev, mailbox);
293 mthca_err(dev, "READ_MGM returned %d\n", err);
297 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
299 err = mthca_WRITE_MGM(dev, prev, mailbox);
301 mthca_err(dev, "WRITE_MGM returned %d\n", err);
304 BUG_ON(index < dev->limits.num_mgms);
305 mthca_free(&dev->mcg_table.alloc, index);
309 mutex_unlock(&dev->mcg_table.mutex);
311 mthca_free_mailbox(dev, mailbox);
315 int mthca_init_mcg_table(struct mthca_dev *dev)
318 int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
320 err = mthca_alloc_init(&dev->mcg_table.alloc,
323 dev->limits.num_mgms);
327 mutex_init(&dev->mcg_table.mutex);
332 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
334 mthca_alloc_cleanup(&dev->mcg_table.alloc);