drivers/net/mlx4/srq.c

   1 /*
   2  * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   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:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/init.h>
  35
  36 #include <linux/mlx4/cmd.h>
  37
  38 #include "mlx4.h"
  39 #include "icm.h"
  40
  41 struct mlx4_srq_context {
  42         __be32                  state_logsize_srqn;
  43         u8                      logstride;
  44         u8                      reserved1[3];
  45         u8                      pg_offset;
  46         u8                      reserved2[3];
  47         u32                     reserved3;
  48         u8                      log_page_size;
  49         u8                      reserved4[2];
  50         u8                      mtt_base_addr_h;
  51         __be32                  mtt_base_addr_l;
  52         __be32                  pd;
  53         __be16                  limit_watermark;
  54         __be16                  wqe_cnt;
  55         u16                     reserved5;
  56         __be16                  wqe_counter;
  57         u32                     reserved6;
  58         __be64                  db_rec_addr;
  59 };
  60
  61 void mlx4_srq_event(struct mlx4_dev *dev, u32 srqn, int event_type)
  62 {
  63         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
  64         struct mlx4_srq *srq;
  65
  66         spin_lock(&srq_table->lock);
  67
  68         srq = radix_tree_lookup(&srq_table->tree, srqn & (dev->caps.num_srqs - 1));
  69         if (srq)
  70                 atomic_inc(&srq->refcount);
  71
  72         spin_unlock(&srq_table->lock);
  73
  74         if (!srq) {
  75                 mlx4_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
  76                 return;
  77         }
  78
  79         srq->event(srq, event_type);
  80
  81         if (atomic_dec_and_test(&srq->refcount))
  82                 complete(&srq->free);
  83 }
  84
  85 static int mlx4_SW2HW_SRQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  86                           int srq_num)
  87 {
  88         return mlx4_cmd(dev, mailbox->dma, srq_num, 0, MLX4_CMD_SW2HW_SRQ,
  89                         MLX4_CMD_TIME_CLASS_A);
  90 }
  91
  92 static int mlx4_HW2SW_SRQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  93                           int srq_num)
  94 {
  95         return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, srq_num,
  96                             mailbox ? 0 : 1, MLX4_CMD_HW2SW_SRQ,
  97                             MLX4_CMD_TIME_CLASS_A);
  98 }
  99
 100 static int mlx4_ARM_SRQ(struct mlx4_dev *dev, int srq_num, int limit_watermark)
 101 {
 102         return mlx4_cmd(dev, limit_watermark, srq_num, 0, MLX4_CMD_ARM_SRQ,
 103                         MLX4_CMD_TIME_CLASS_B);
 104 }
 105
 106 static int mlx4_QUERY_SRQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 107                           int srq_num)
 108 {
 109         return mlx4_cmd_box(dev, 0, mailbox->dma, srq_num, 0, MLX4_CMD_QUERY_SRQ,
 110                             MLX4_CMD_TIME_CLASS_A);
 111 }
 112
 113 int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, struct mlx4_mtt *mtt,
 114                    u64 db_rec, struct mlx4_srq *srq)
 115 {
 116         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 117         struct mlx4_cmd_mailbox *mailbox;
 118         struct mlx4_srq_context *srq_context;
 119         u64 mtt_addr;
 120         int err;
 121
 122         srq->srqn = mlx4_bitmap_alloc(&srq_table->bitmap);
 123         if (srq->srqn == -1)
 124                 return -ENOMEM;
 125
 126         err = mlx4_table_get(dev, &srq_table->table, srq->srqn);
 127         if (err)
 128                 goto err_out;
 129
 130         err = mlx4_table_get(dev, &srq_table->cmpt_table, srq->srqn);
 131         if (err)
 132                 goto err_put;
 133
 134         spin_lock_irq(&srq_table->lock);
 135         err = radix_tree_insert(&srq_table->tree, srq->srqn, srq);
 136         spin_unlock_irq(&srq_table->lock);
 137         if (err)
 138                 goto err_cmpt_put;
 139
 140         mailbox = mlx4_alloc_cmd_mailbox(dev);
 141         if (IS_ERR(mailbox)) {
 142                 err = PTR_ERR(mailbox);
 143                 goto err_radix;
 144         }
 145
 146         srq_context = mailbox->buf;
 147         memset(srq_context, 0, sizeof *srq_context);
 148
 149         srq_context->state_logsize_srqn = cpu_to_be32((ilog2(srq->max) << 24) |
 150                                                       srq->srqn);
 151         srq_context->logstride          = srq->wqe_shift - 4;
 152         srq_context->log_page_size      = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
 153
 154         mtt_addr = mlx4_mtt_addr(dev, mtt);
 155         srq_context->mtt_base_addr_h    = mtt_addr >> 32;
 156         srq_context->mtt_base_addr_l    = cpu_to_be32(mtt_addr & 0xffffffff);
 157         srq_context->pd                 = cpu_to_be32(pdn);
 158         srq_context->db_rec_addr        = cpu_to_be64(db_rec);
 159
 160         err = mlx4_SW2HW_SRQ(dev, mailbox, srq->srqn);
 161         mlx4_free_cmd_mailbox(dev, mailbox);
 162         if (err)
 163                 goto err_radix;
 164
 165         atomic_set(&srq->refcount, 1);
 166         init_completion(&srq->free);
 167
 168         return 0;
 169
 170 err_radix:
 171         spin_lock_irq(&srq_table->lock);
 172         radix_tree_delete(&srq_table->tree, srq->srqn);
 173         spin_unlock_irq(&srq_table->lock);
 174
 175 err_cmpt_put:
 176         mlx4_table_put(dev, &srq_table->cmpt_table, srq->srqn);
 177
 178 err_put:
 179         mlx4_table_put(dev, &srq_table->table, srq->srqn);
 180
 181 err_out:
 182         mlx4_bitmap_free(&srq_table->bitmap, srq->srqn);
 183
 184         return err;
 185 }
 186 EXPORT_SYMBOL_GPL(mlx4_srq_alloc);
 187
 188 void mlx4_srq_free(struct mlx4_dev *dev, struct mlx4_srq *srq)
 189 {
 190         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 191         int err;
 192
 193         err = mlx4_HW2SW_SRQ(dev, NULL, srq->srqn);
 194         if (err)
 195                 mlx4_warn(dev, "HW2SW_SRQ failed (%d) for SRQN %06x\n", err, srq->srqn);
 196
 197         spin_lock_irq(&srq_table->lock);
 198         radix_tree_delete(&srq_table->tree, srq->srqn);
 199         spin_unlock_irq(&srq_table->lock);
 200
 201         if (atomic_dec_and_test(&srq->refcount))
 202                 complete(&srq->free);
 203         wait_for_completion(&srq->free);
 204
 205         mlx4_table_put(dev, &srq_table->table, srq->srqn);
 206         mlx4_bitmap_free(&srq_table->bitmap, srq->srqn);
 207 }
 208 EXPORT_SYMBOL_GPL(mlx4_srq_free);
 209
 210 int mlx4_srq_arm(struct mlx4_dev *dev, struct mlx4_srq *srq, int limit_watermark)
 211 {
 212         return mlx4_ARM_SRQ(dev, srq->srqn, limit_watermark);
 213 }
 214 EXPORT_SYMBOL_GPL(mlx4_srq_arm);
 215
 216 int mlx4_srq_query(struct mlx4_dev *dev, struct mlx4_srq *srq, int *limit_watermark)
 217 {
 218         struct mlx4_cmd_mailbox *mailbox;
 219         struct mlx4_srq_context *srq_context;
 220         int err;
 221
 222         mailbox = mlx4_alloc_cmd_mailbox(dev);
 223         if (IS_ERR(mailbox))
 224                 return PTR_ERR(mailbox);
 225
 226         srq_context = mailbox->buf;
 227
 228         err = mlx4_QUERY_SRQ(dev, mailbox, srq->srqn);
 229         if (err)
 230                 goto err_out;
 231         *limit_watermark = be16_to_cpu(srq_context->limit_watermark);
 232
 233 err_out:
 234         mlx4_free_cmd_mailbox(dev, mailbox);
 235         return err;
 236 }
 237 EXPORT_SYMBOL_GPL(mlx4_srq_query);
 238
 239 int mlx4_init_srq_table(struct mlx4_dev *dev)
 240 {
 241         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 242         int err;
 243
 244         spin_lock_init(&srq_table->lock);
 245         INIT_RADIX_TREE(&srq_table->tree, GFP_ATOMIC);
 246
 247         err = mlx4_bitmap_init(&srq_table->bitmap, dev->caps.num_srqs,
 248                                dev->caps.num_srqs - 1, dev->caps.reserved_srqs);
 249         if (err)
 250                 return err;
 251
 252         return 0;
 253 }
 254
 255 void mlx4_cleanup_srq_table(struct mlx4_dev *dev)
 256 {
 257         mlx4_bitmap_cleanup(&mlx4_priv(dev)->srq_table.bitmap);
 258 }