2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
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6 * General Public License (GPL) Version 2, available from the file
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11 * without modification, are permitted provided that the following
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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
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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33 #include <linux/init.h>
34 #include <linux/string.h>
35 #include <linux/slab.h>
37 #include <linux/mlx4/cmd.h>
42 __be32 next_gid_index;
46 __be32 qp[MLX4_QP_PER_MGM];
49 static const u8 zero_gid[16]; /* automatically initialized to 0 */
51 static int mlx4_READ_MCG(struct mlx4_dev *dev, int index,
52 struct mlx4_cmd_mailbox *mailbox)
54 return mlx4_cmd_box(dev, 0, mailbox->dma, index, 0, MLX4_CMD_READ_MCG,
55 MLX4_CMD_TIME_CLASS_A);
58 static int mlx4_WRITE_MCG(struct mlx4_dev *dev, int index,
59 struct mlx4_cmd_mailbox *mailbox)
61 return mlx4_cmd(dev, mailbox->dma, index, 0, MLX4_CMD_WRITE_MCG,
62 MLX4_CMD_TIME_CLASS_A);
65 static int mlx4_MGID_HASH(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
71 err = mlx4_cmd_imm(dev, mailbox->dma, &imm, 0, 0, MLX4_CMD_MGID_HASH,
72 MLX4_CMD_TIME_CLASS_A);
81 * Caller must hold MCG table semaphore. gid and mgm parameters must
82 * be properly aligned for command interface.
84 * Returns 0 unless a firmware command error occurs.
86 * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
87 * and *mgm holds MGM entry.
89 * if GID is found in AMGM, *index = index in AMGM, *prev = index of
90 * previous entry in hash chain and *mgm holds AMGM entry.
92 * If no AMGM exists for given gid, *index = -1, *prev = index of last
93 * entry in hash chain and *mgm holds end of hash chain.
95 static int find_mgm(struct mlx4_dev *dev,
96 u8 *gid, struct mlx4_cmd_mailbox *mgm_mailbox,
97 u16 *hash, int *prev, int *index)
99 struct mlx4_cmd_mailbox *mailbox;
100 struct mlx4_mgm *mgm = mgm_mailbox->buf;
104 mailbox = mlx4_alloc_cmd_mailbox(dev);
109 memcpy(mgid, gid, 16);
111 err = mlx4_MGID_HASH(dev, mailbox, hash);
112 mlx4_free_cmd_mailbox(dev, mailbox);
117 mlx4_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
118 "%04x:%04x:%04x:%04x is %04x\n",
119 be16_to_cpu(((__be16 *) gid)[0]),
120 be16_to_cpu(((__be16 *) gid)[1]),
121 be16_to_cpu(((__be16 *) gid)[2]),
122 be16_to_cpu(((__be16 *) gid)[3]),
123 be16_to_cpu(((__be16 *) gid)[4]),
124 be16_to_cpu(((__be16 *) gid)[5]),
125 be16_to_cpu(((__be16 *) gid)[6]),
126 be16_to_cpu(((__be16 *) gid)[7]),
133 err = mlx4_READ_MCG(dev, *index, mgm_mailbox);
137 if (!memcmp(mgm->gid, zero_gid, 16)) {
138 if (*index != *hash) {
139 mlx4_err(dev, "Found zero MGID in AMGM.\n");
145 if (!memcmp(mgm->gid, gid, 16))
149 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
156 int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
158 struct mlx4_priv *priv = mlx4_priv(dev);
159 struct mlx4_cmd_mailbox *mailbox;
160 struct mlx4_mgm *mgm;
168 mailbox = mlx4_alloc_cmd_mailbox(dev);
170 return PTR_ERR(mailbox);
173 mutex_lock(&priv->mcg_table.mutex);
175 err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
180 if (!memcmp(mgm->gid, zero_gid, 16))
181 memcpy(mgm->gid, gid, 16);
185 index = mlx4_bitmap_alloc(&priv->mcg_table.bitmap);
187 mlx4_err(dev, "No AMGM entries left\n");
191 index += dev->caps.num_mgms;
193 memset(mgm, 0, sizeof *mgm);
194 memcpy(mgm->gid, gid, 16);
197 members_count = be32_to_cpu(mgm->members_count);
198 if (members_count == MLX4_QP_PER_MGM) {
199 mlx4_err(dev, "MGM at index %x is full.\n", index);
204 for (i = 0; i < members_count; ++i)
205 if (mgm->qp[i] == cpu_to_be32(qp->qpn)) {
206 mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
211 mgm->qp[members_count++] = cpu_to_be32(qp->qpn);
212 mgm->members_count = cpu_to_be32(members_count);
214 err = mlx4_WRITE_MCG(dev, index, mailbox);
221 err = mlx4_READ_MCG(dev, prev, mailbox);
225 mgm->next_gid_index = cpu_to_be32(index << 6);
227 err = mlx4_WRITE_MCG(dev, prev, mailbox);
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);
237 mlx4_bitmap_free(&priv->mcg_table.bitmap,
238 index - dev->caps.num_mgms);
240 mutex_unlock(&priv->mcg_table.mutex);
242 mlx4_free_cmd_mailbox(dev, mailbox);
245 EXPORT_SYMBOL_GPL(mlx4_multicast_attach);
247 int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
249 struct mlx4_priv *priv = mlx4_priv(dev);
250 struct mlx4_cmd_mailbox *mailbox;
251 struct mlx4_mgm *mgm;
258 mailbox = mlx4_alloc_cmd_mailbox(dev);
260 return PTR_ERR(mailbox);
263 mutex_lock(&priv->mcg_table.mutex);
265 err = find_mgm(dev, gid, mailbox, &hash, &prev, &index);
270 mlx4_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
272 be16_to_cpu(((__be16 *) gid)[0]),
273 be16_to_cpu(((__be16 *) gid)[1]),
274 be16_to_cpu(((__be16 *) gid)[2]),
275 be16_to_cpu(((__be16 *) gid)[3]),
276 be16_to_cpu(((__be16 *) gid)[4]),
277 be16_to_cpu(((__be16 *) gid)[5]),
278 be16_to_cpu(((__be16 *) gid)[6]),
279 be16_to_cpu(((__be16 *) gid)[7]));
284 members_count = be32_to_cpu(mgm->members_count);
285 for (loc = -1, i = 0; i < members_count; ++i)
286 if (mgm->qp[i] == cpu_to_be32(qp->qpn))
290 mlx4_err(dev, "QP %06x not found in MGM\n", qp->qpn);
296 mgm->members_count = cpu_to_be32(--members_count);
297 mgm->qp[loc] = mgm->qp[i - 1];
301 err = mlx4_WRITE_MCG(dev, index, mailbox);
306 /* Remove entry from MGM */
307 int amgm_index = be32_to_cpu(mgm->next_gid_index) >> 6;
309 err = mlx4_READ_MCG(dev, amgm_index, mailbox);
313 memset(mgm->gid, 0, 16);
315 err = mlx4_WRITE_MCG(dev, index, mailbox);
320 if (amgm_index < dev->caps.num_mgms)
321 mlx4_warn(dev, "MGM entry %d had AMGM index %d < %d",
322 index, amgm_index, dev->caps.num_mgms);
324 mlx4_bitmap_free(&priv->mcg_table.bitmap,
325 amgm_index - dev->caps.num_mgms);
328 /* Remove entry from AMGM */
329 int cur_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
330 err = mlx4_READ_MCG(dev, prev, mailbox);
334 mgm->next_gid_index = cpu_to_be32(cur_next_index << 6);
336 err = mlx4_WRITE_MCG(dev, prev, mailbox);
340 if (index < dev->caps.num_mgms)
341 mlx4_warn(dev, "entry %d had next AMGM index %d < %d",
342 prev, index, dev->caps.num_mgms);
344 mlx4_bitmap_free(&priv->mcg_table.bitmap,
345 index - dev->caps.num_mgms);
349 mutex_unlock(&priv->mcg_table.mutex);
351 mlx4_free_cmd_mailbox(dev, mailbox);
354 EXPORT_SYMBOL_GPL(mlx4_multicast_detach);
356 int mlx4_init_mcg_table(struct mlx4_dev *dev)
358 struct mlx4_priv *priv = mlx4_priv(dev);
361 err = mlx4_bitmap_init(&priv->mcg_table.bitmap,
362 dev->caps.num_amgms, dev->caps.num_amgms - 1, 0);
366 mutex_init(&priv->mcg_table.mutex);
371 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev)
373 mlx4_bitmap_cleanup(&mlx4_priv(dev)->mcg_table.bitmap);