2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
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22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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34 #include <linux/init.h>
35 #include <linux/string.h>
36 #include <linux/slab.h>
38 #include <linux/mlx4/cmd.h>
42 #define MGM_QPN_MASK 0x00FFFFFF
43 #define MGM_BLCK_LB_BIT 30
46 __be32 next_gid_index;
50 __be32 qp[MLX4_QP_PER_MGM];
53 static const u8 zero_gid[16]; /* automatically initialized to 0 */
55 static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
56 struct mlx4_cmd_mailbox *mailbox)
58 return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
59 MLX4_CMD_TIME_CLASS_A);
62 static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
63 struct mlx4_cmd_mailbox *mailbox)
65 return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
66 MLX4_CMD_TIME_CLASS_A);
69 static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
75 err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
76 MLX4_CMD_TIME_CLASS_A);
85 * Caller must hold MCG table semaphore. gid and mgm parameters must
86 * be properly aligned for command interface.
88 * Returns 0 unless a firmware command error occurs.
90 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
91 * and *mgm holds MGM entry.
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.
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.
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)
103 struct mlx4_cmd_mailbox *mailbox;
104 struct mlx4_mgm *mgm = mgm_mailbox->buf;
108 mailbox = mlx4_alloc_cmd_mailbox(dev);
113 memcpy(mgid, gid, 16);
115 err = mlx4_MGID_HASH(dev, mailbox, hash);
116 mlx4_free_cmd_mailbox(dev, mailbox);
121 mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
122 "%04x:%04x:%04x:%04x is %04x\n",
123 be16_to_cpu(((__be16 *) gid)[0]),
124 be16_to_cpu(((__be16 *) gid)[1]),
125 be16_to_cpu(((__be16 *) gid)[2]),
126 be16_to_cpu(((__be16 *) gid)[3]),
127 be16_to_cpu(((__be16 *) gid)[4]),
128 be16_to_cpu(((__be16 *) gid)[5]),
129 be16_to_cpu(((__be16 *) gid)[6]),
130 be16_to_cpu(((__be16 *) gid)[7]),
137 err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
141 if (!memcmp(mgm->gid, zero_gid, 16)) {
142 if (*index != *hash) {
143 mlx4_err(dev, "Found zero MGID in AMGM.\n");
149 if (!memcmp(mgm->gid, gid, 16))
153 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
160 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
161 int block_mcast_loopback)
163 struct mlx4_priv *priv = mlx4_priv(dev);
164 struct mlx4_cmd_mailbox *mailbox;
165 struct mlx4_mgm *mgm;
173 mailbox = mlx4_alloc_cmd_mailbox(dev);
175 return PTR_ERR(mailbox);
178 mutex_lock(&priv->mcg_table.mutex);
180 err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
185 if (!memcmp(mgm->gid, zero_gid, 16))
186 memcpy(mgm->gid, gid, 16);
190 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
192 mlx4_err(dev, "No AMGM entries left\n");
196 index += dev->caps.num_mgms;
198 memset(mgm, 0, sizeof *mgm);
199 memcpy(mgm->gid, gid, 16);
202 members_count = be32_to_cpu(mgm->members_count);
203 if (members_count == MLX4_QP_PER_MGM) {
204 mlx4_err(dev, "MGM at index %x is full.\n", index);
209 for (i = 0; i < members_count; ++i)
210 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
211 mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
216 if (block_mcast_loopback)
217 mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
218 (1 << MGM_BLCK_LB_BIT));
220 mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
222 mgm->members_count = cpu_to_be32(members_count);
224 err = mlx4_WRITE_MCG(dev, index, mailbox);
231 err = mlx4_READ_MCG(dev, prev, mailbox);
235 mgm->next_gid_index = cpu_to_be32(index << 6);
237 err = mlx4_WRITE_MCG(dev, prev, mailbox);
242 if (err && link && index != -1) {
243 if (index < dev->caps.num_mgms)
244 mlx4_warn(dev, "Got AMGM index %d < %d",
245 index, dev->caps.num_mgms);
247 mlx4_bitmap_free(&priv->mcg_table.bitmap,
248 index - dev->caps.num_mgms);
250 mutex_unlock(&priv->mcg_table.mutex);
252 mlx4_free_cmd_mailbox(dev, mailbox);
255 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
257 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
259 struct mlx4_priv *priv = mlx4_priv(dev);
260 struct mlx4_cmd_mailbox *mailbox;
261 struct mlx4_mgm *mgm;
268 mailbox = mlx4_alloc_cmd_mailbox(dev);
270 return PTR_ERR(mailbox);
273 mutex_lock(&priv->mcg_table.mutex);
275 err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
280 mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
282 be16_to_cpu(((__be16 *) gid)[0]),
283 be16_to_cpu(((__be16 *) gid)[1]),
284 be16_to_cpu(((__be16 *) gid)[2]),
285 be16_to_cpu(((__be16 *) gid)[3]),
286 be16_to_cpu(((__be16 *) gid)[4]),
287 be16_to_cpu(((__be16 *) gid)[5]),
288 be16_to_cpu(((__be16 *) gid)[6]),
289 be16_to_cpu(((__be16 *) gid)[7]));
294 members_count = be32_to_cpu(mgm->members_count);
295 for (loc = -1, i = 0; i < members_count; ++i)
296 if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
300 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
306 mgm->members_count = cpu_to_be32(--members_count);
307 mgm->qp[loc] = mgm->qp[i - 1];
311 err = mlx4_WRITE_MCG(dev, index, mailbox);
316 /* Remove entry from MGM */
317 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
319 err = mlx4_READ_MCG(dev, amgm_index, mailbox);
323 memset(mgm->gid, 0, 16);
325 err = mlx4_WRITE_MCG(dev, index, mailbox);
330 if (amgm_index < dev->caps.num_mgms)
331 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
332 index, amgm_index, dev->caps.num_mgms);
334 mlx4_bitmap_free(&priv->mcg_table.bitmap,
335 amgm_index - dev->caps.num_mgms);
338 /* Remove entry from AMGM */
339 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
340 err = mlx4_READ_MCG(dev, prev, mailbox);
344 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
346 err = mlx4_WRITE_MCG(dev, prev, mailbox);
350 if (index < dev->caps.num_mgms)
351 mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
352 prev, index, dev->caps.num_mgms);
354 mlx4_bitmap_free(&priv->mcg_table.bitmap,
355 index - dev->caps.num_mgms);
359 mutex_unlock(&priv->mcg_table.mutex);
361 mlx4_free_cmd_mailbox(dev, mailbox);
364 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
366 int mlx4_init_mcg_table(struct mlx4_dev *dev)
368 struct mlx4_priv *priv = mlx4_priv(dev);
371 err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
372 dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
376 mutex_init(&priv->mcg_table.mutex);
381 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
383 mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);