drivers/net/mlx4/qp.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/init.h>
  37
  38 #include <linux/mlx4/cmd.h>
  39 #include <linux/mlx4/qp.h>
  40
  41 #include "mlx4.h"
  42 #include "icm.h"
  43
  44 void mlx4_qp_event(struct mlx4_dev *dev, u32 qpn, int event_type)
  45 {
  46         struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
  47         struct mlx4_qp *qp;
  48
  49         spin_lock(&qp_table->lock);
  50
  51         qp = __mlx4_qp_lookup(dev, qpn);
  52         if (qp)
  53                 atomic_inc(&qp->refcount);
  54
  55         spin_unlock(&qp_table->lock);
  56
  57         if (!qp) {
  58                 mlx4_warn(dev, "Async event for bogus QP %08x\n", qpn);
  59                 return;
  60         }
  61
  62         qp->event(qp, event_type);
  63
  64         if (atomic_dec_and_test(&qp->refcount))
  65                 complete(&qp->free);
  66 }
  67
  68 int mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
  69                    enum mlx4_qp_state cur_state, enum mlx4_qp_state new_state,
  70                    struct mlx4_qp_context *context, enum mlx4_qp_optpar optpar,
  71                    int sqd_event, struct mlx4_qp *qp)
  72 {
  73         static const u16 op[MLX4_QP_NUM_STATE][MLX4_QP_NUM_STATE] = {
  74                 [MLX4_QP_STATE_RST] = {
  75                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
  76                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
  77                         [MLX4_QP_STATE_INIT]    = MLX4_CMD_RST2INIT_QP,
  78                 },
  79                 [MLX4_QP_STATE_INIT]  = {
  80                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
  81                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
  82                         [MLX4_QP_STATE_INIT]    = MLX4_CMD_INIT2INIT_QP,
  83                         [MLX4_QP_STATE_RTR]     = MLX4_CMD_INIT2RTR_QP,
  84                 },
  85                 [MLX4_QP_STATE_RTR]   = {
  86                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
  87                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
  88                         [MLX4_QP_STATE_RTS]     = MLX4_CMD_RTR2RTS_QP,
  89                 },
  90                 [MLX4_QP_STATE_RTS]   = {
  91                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
  92                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
  93                         [MLX4_QP_STATE_RTS]     = MLX4_CMD_RTS2RTS_QP,
  94                         [MLX4_QP_STATE_SQD]     = MLX4_CMD_RTS2SQD_QP,
  95                 },
  96                 [MLX4_QP_STATE_SQD] = {
  97                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
  98                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
  99                         [MLX4_QP_STATE_RTS]     = MLX4_CMD_SQD2RTS_QP,
 100                         [MLX4_QP_STATE_SQD]     = MLX4_CMD_SQD2SQD_QP,
 101                 },
 102                 [MLX4_QP_STATE_SQER] = {
 103                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
 104                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
 105                         [MLX4_QP_STATE_RTS]     = MLX4_CMD_SQERR2RTS_QP,
 106                 },
 107                 [MLX4_QP_STATE_ERR] = {
 108                         [MLX4_QP_STATE_RST]     = MLX4_CMD_2RST_QP,
 109                         [MLX4_QP_STATE_ERR]     = MLX4_CMD_2ERR_QP,
 110                 }
 111         };
 112
 113         struct mlx4_cmd_mailbox *mailbox;
 114         int ret = 0;
 115
 116         if (cur_state >= MLX4_QP_NUM_STATE || new_state >= MLX4_QP_NUM_STATE ||
 117             !op[cur_state][new_state])
 118                 return -EINVAL;
 119
 120         if (op[cur_state][new_state] == MLX4_CMD_2RST_QP)
 121                 return mlx4_cmd(dev, 0, qp->qpn, 2,
 122                                 MLX4_CMD_2RST_QP, MLX4_CMD_TIME_CLASS_A);
 123
 124         mailbox = mlx4_alloc_cmd_mailbox(dev);
 125         if (IS_ERR(mailbox))
 126                 return PTR_ERR(mailbox);
 127
 128         if (cur_state == MLX4_QP_STATE_RST && new_state == MLX4_QP_STATE_INIT) {
 129                 u64 mtt_addr = mlx4_mtt_addr(dev, mtt);
 130                 context->mtt_base_addr_h = mtt_addr >> 32;
 131                 context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
 132                 context->log_page_size   = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
 133         }
 134
 135         *(__be32 *) mailbox->buf = cpu_to_be32(optpar);
 136         memcpy(mailbox->buf + 8, context, sizeof *context);
 137
 138         ((struct mlx4_qp_context *) (mailbox->buf + 8))->local_qpn =
 139                 cpu_to_be32(qp->qpn);
 140
 141         ret = mlx4_cmd(dev, mailbox->dma, qp->qpn | (!!sqd_event << 31),
 142                        new_state == MLX4_QP_STATE_RST ? 2 : 0,
 143                        op[cur_state][new_state], MLX4_CMD_TIME_CLASS_C);
 144
 145         mlx4_free_cmd_mailbox(dev, mailbox);
 146         return ret;
 147 }
 148 EXPORT_SYMBOL_GPL(mlx4_qp_modify);
 149
 150 int mlx4_qp_alloc(struct mlx4_dev *dev, int sqpn, struct mlx4_qp *qp)
 151 {
 152         struct mlx4_priv *priv = mlx4_priv(dev);
 153         struct mlx4_qp_table *qp_table = &priv->qp_table;
 154         int err;
 155
 156         if (sqpn)
 157                 qp->qpn = sqpn;
 158         else {
 159                 qp->qpn = mlx4_bitmap_alloc(&qp_table->bitmap);
 160                 if (qp->qpn == -1)
 161                         return -ENOMEM;
 162         }
 163
 164         err = mlx4_table_get(dev, &qp_table->qp_table, qp->qpn);
 165         if (err)
 166                 goto err_out;
 167
 168         err = mlx4_table_get(dev, &qp_table->auxc_table, qp->qpn);
 169         if (err)
 170                 goto err_put_qp;
 171
 172         err = mlx4_table_get(dev, &qp_table->altc_table, qp->qpn);
 173         if (err)
 174                 goto err_put_auxc;
 175
 176         err = mlx4_table_get(dev, &qp_table->rdmarc_table, qp->qpn);
 177         if (err)
 178                 goto err_put_altc;
 179
 180         err = mlx4_table_get(dev, &qp_table->cmpt_table, qp->qpn);
 181         if (err)
 182                 goto err_put_rdmarc;
 183
 184         spin_lock_irq(&qp_table->lock);
 185         err = radix_tree_insert(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1), qp);
 186         spin_unlock_irq(&qp_table->lock);
 187         if (err)
 188                 goto err_put_cmpt;
 189
 190         atomic_set(&qp->refcount, 1);
 191         init_completion(&qp->free);
 192
 193         return 0;
 194
 195 err_put_cmpt:
 196         mlx4_table_put(dev, &qp_table->cmpt_table, qp->qpn);
 197
 198 err_put_rdmarc:
 199         mlx4_table_put(dev, &qp_table->rdmarc_table, qp->qpn);
 200
 201 err_put_altc:
 202         mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);
 203
 204 err_put_auxc:
 205         mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);
 206
 207 err_put_qp:
 208         mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);
 209
 210 err_out:
 211         if (!sqpn)
 212                 mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);
 213
 214         return err;
 215 }
 216 EXPORT_SYMBOL_GPL(mlx4_qp_alloc);
 217
 218 void mlx4_qp_remove(struct mlx4_dev *dev, struct mlx4_qp *qp)
 219 {
 220         struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 221         unsigned long flags;
 222
 223         spin_lock_irqsave(&qp_table->lock, flags);
 224         radix_tree_delete(&dev->qp_table_tree, qp->qpn & (dev->caps.num_qps - 1));
 225         spin_unlock_irqrestore(&qp_table->lock, flags);
 226 }
 227 EXPORT_SYMBOL_GPL(mlx4_qp_remove);
 228
 229 void mlx4_qp_free(struct mlx4_dev *dev, struct mlx4_qp *qp)
 230 {
 231         struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 232
 233         if (atomic_dec_and_test(&qp->refcount))
 234                 complete(&qp->free);
 235         wait_for_completion(&qp->free);
 236
 237         mlx4_table_put(dev, &qp_table->cmpt_table, qp->qpn);
 238         mlx4_table_put(dev, &qp_table->rdmarc_table, qp->qpn);
 239         mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);
 240         mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);
 241         mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);
 242
 243         if (qp->qpn >= dev->caps.sqp_start + 8)
 244                 mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);
 245 }
 246 EXPORT_SYMBOL_GPL(mlx4_qp_free);
 247
 248 static int mlx4_CONF_SPECIAL_QP(struct mlx4_dev *dev, u32 base_qpn)
 249 {
 250         return mlx4_cmd(dev, 0, base_qpn, 0, MLX4_CMD_CONF_SPECIAL_QP,
 251                         MLX4_CMD_TIME_CLASS_B);
 252 }
 253
 254 int mlx4_init_qp_table(struct mlx4_dev *dev)
 255 {
 256         struct mlx4_qp_table *qp_table = &mlx4_priv(dev)->qp_table;
 257         int err;
 258
 259         spin_lock_init(&qp_table->lock);
 260         INIT_RADIX_TREE(&dev->qp_table_tree, GFP_ATOMIC);
 261
 262         /*
 263          * We reserve 2 extra QPs per port for the special QPs.  The
 264          * block of special QPs must be aligned to a multiple of 8, so
 265          * round up.
 266          */
 267         dev->caps.sqp_start = ALIGN(dev->caps.reserved_qps, 8);
 268         err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
 269                                (1 << 24) - 1, dev->caps.sqp_start + 8);
 270         if (err)
 271                 return err;
 272
 273         return mlx4_CONF_SPECIAL_QP(dev, dev->caps.sqp_start);
 274 }
 275
 276 void mlx4_cleanup_qp_table(struct mlx4_dev *dev)
 277 {
 278         mlx4_CONF_SPECIAL_QP(dev, 0);
 279         mlx4_bitmap_cleanup(&mlx4_priv(dev)->qp_table.bitmap);
 280 }
 281
 282 int mlx4_qp_query(struct mlx4_dev *dev, struct mlx4_qp *qp,
 283                   struct mlx4_qp_context *context)
 284 {
 285         struct mlx4_cmd_mailbox *mailbox;
 286         int err;
 287
 288         mailbox = mlx4_alloc_cmd_mailbox(dev);
 289         if (IS_ERR(mailbox))
 290                 return PTR_ERR(mailbox);
 291
 292         err = mlx4_cmd_box(dev, 0, mailbox->dma, qp->qpn, 0,
 293                            MLX4_CMD_QUERY_QP, MLX4_CMD_TIME_CLASS_A);
 294         if (!err)
 295                 memcpy(context, mailbox->buf + 8, sizeof *context);
 296
 297         mlx4_free_cmd_mailbox(dev, mailbox);
 298         return err;
 299 }
 300 EXPORT_SYMBOL_GPL(mlx4_qp_query);
 301
 302 int mlx4_qp_to_ready(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 303                      struct mlx4_qp_context *context,
 304                      struct mlx4_qp *qp, enum mlx4_qp_state *qp_state)
 305 {
 306         int err;
 307         int i;
 308         enum mlx4_qp_state states[] = {
 309                 MLX4_QP_STATE_RST,
 310                 MLX4_QP_STATE_INIT,
 311                 MLX4_QP_STATE_RTR,
 312                 MLX4_QP_STATE_RTS
 313         };
 314
 315         for (i = 0; i < ARRAY_SIZE(states) - 1; i++) {
 316                 context->flags &= cpu_to_be32(~(0xf << 28));
 317                 context->flags |= cpu_to_be32(states[i + 1] << 28);
 318                 err = mlx4_qp_modify(dev, mtt, states[i], states[i + 1],
 319                                      context, 0, 0, qp);
 320                 if (err) {
 321                         mlx4_err(dev, "Failed to bring QP to state: "
 322                                  "%d with error: %d\n",
 323                                  states[i + 1], err);
 324                         return err;
 325                 }
 326
 327                 *qp_state = states[i + 1];
 328         }
 329
 330         return 0;
 331 }
 332 EXPORT_SYMBOL_GPL(mlx4_qp_to_ready);