release/src-rt-6.x/linux/linux-2.6/drivers/net/mlx4/srq.c

   1 /*
   2  * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
   3  *
   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:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  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.
  22  *
  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
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/init.h>
  34
  35 #include <linux/mlx4/cmd.h>
  36
  37 #include "mlx4.h"
  38 #include "icm.h"
  39
  40 struct mlx4_srq_context {
  41         __be32                  state_logsize_srqn;
  42         u8                      logstride;
  43         u8                      reserved1[3];
  44         u8                      pg_offset;
  45         u8                      reserved2[3];
  46         u32                     reserved3;
  47         u8                      log_page_size;
  48         u8                      reserved4[2];
  49         u8                      mtt_base_addr_h;
  50         __be32                  mtt_base_addr_l;
  51         __be32                  pd;
  52         __be16                  limit_watermark;
  53         __be16                  wqe_cnt;
  54         u16                     reserved5;
  55         __be16                  wqe_counter;
  56         u32                     reserved6;
  57         __be64                  db_rec_addr;
  58 };
  59
  60 void mlx4_srq_event(struct mlx4_dev *dev, u32 srqn, int event_type)
  61 {
  62         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
  63         struct mlx4_srq *srq;
  64
  65         spin_lock(&srq_table->lock);
  66
  67         srq = radix_tree_lookup(&srq_table->tree, srqn & (dev->caps.num_srqs - 1));
  68         if (srq)
  69                 atomic_inc(&srq->refcount);
  70
  71         spin_unlock(&srq_table->lock);
  72
  73         if (!srq) {
  74                 mlx4_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
  75                 return;
  76         }
  77
  78         srq->event(srq, event_type);
  79
  80         if (atomic_dec_and_test(&srq->refcount))
  81                 complete(&srq->free);
  82 }
  83
  84 static int mlx4_SW2HW_SRQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  85                           int srq_num)
  86 {
  87         return mlx4_cmd(dev, mailbox->dma, srq_num, 0, MLX4_CMD_SW2HW_SRQ,
  88                         MLX4_CMD_TIME_CLASS_A);
  89 }
  90
  91 static int mlx4_HW2SW_SRQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
  92                           int srq_num)
  93 {
  94         return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, srq_num,
  95                             mailbox ? 0 : 1, MLX4_CMD_HW2SW_SRQ,
  96                             MLX4_CMD_TIME_CLASS_A);
  97 }
  98
  99 static int mlx4_ARM_SRQ(struct mlx4_dev *dev, int srq_num, int limit_watermark)
 100 {
 101         return mlx4_cmd(dev, limit_watermark, srq_num, 0, MLX4_CMD_ARM_SRQ,
 102                         MLX4_CMD_TIME_CLASS_B);
 103 }
 104
 105 int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, struct mlx4_mtt *mtt,
 106                    u64 db_rec, struct mlx4_srq *srq)
 107 {
 108         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 109         struct mlx4_cmd_mailbox *mailbox;
 110         struct mlx4_srq_context *srq_context;
 111         u64 mtt_addr;
 112         int err;
 113
 114         srq->srqn = mlx4_bitmap_alloc(&srq_table->bitmap);
 115         if (srq->srqn == -1)
 116                 return -ENOMEM;
 117
 118         err = mlx4_table_get(dev, &srq_table->table, srq->srqn);
 119         if (err)
 120                 goto err_out;
 121
 122         err = mlx4_table_get(dev, &srq_table->cmpt_table, srq->srqn);
 123         if (err)
 124                 goto err_put;
 125
 126         spin_lock_irq(&srq_table->lock);
 127         err = radix_tree_insert(&srq_table->tree, srq->srqn, srq);
 128         spin_unlock_irq(&srq_table->lock);
 129         if (err)
 130                 goto err_cmpt_put;
 131
 132         mailbox = mlx4_alloc_cmd_mailbox(dev);
 133         if (IS_ERR(mailbox)) {
 134                 err = PTR_ERR(mailbox);
 135                 goto err_radix;
 136         }
 137
 138         srq_context = mailbox->buf;
 139         memset(srq_context, 0, sizeof *srq_context);
 140
 141         srq_context->state_logsize_srqn = cpu_to_be32((ilog2(srq->max) << 24) |
 142                                                       srq->srqn);
 143         srq_context->logstride          = srq->wqe_shift - 4;
 144         srq_context->log_page_size      = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
 145
 146         mtt_addr = mlx4_mtt_addr(dev, mtt);
 147         srq_context->mtt_base_addr_h    = mtt_addr >> 32;
 148         srq_context->mtt_base_addr_l    = cpu_to_be32(mtt_addr & 0xffffffff);
 149         srq_context->pd                 = cpu_to_be32(pdn);
 150         srq_context->db_rec_addr        = cpu_to_be64(db_rec);
 151
 152         err = mlx4_SW2HW_SRQ(dev, mailbox, srq->srqn);
 153         mlx4_free_cmd_mailbox(dev, mailbox);
 154         if (err)
 155                 goto err_radix;
 156
 157         atomic_set(&srq->refcount, 1);
 158         init_completion(&srq->free);
 159
 160         return 0;
 161
 162 err_radix:
 163         spin_lock_irq(&srq_table->lock);
 164         radix_tree_delete(&srq_table->tree, srq->srqn);
 165         spin_unlock_irq(&srq_table->lock);
 166
 167 err_cmpt_put:
 168         mlx4_table_put(dev, &srq_table->cmpt_table, srq->srqn);
 169
 170 err_put:
 171         mlx4_table_put(dev, &srq_table->table, srq->srqn);
 172
 173 err_out:
 174         mlx4_bitmap_free(&srq_table->bitmap, srq->srqn);
 175
 176         return err;
 177 }
 178 EXPORT_SYMBOL_GPL(mlx4_srq_alloc);
 179
 180 void mlx4_srq_free(struct mlx4_dev *dev, struct mlx4_srq *srq)
 181 {
 182         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 183         int err;
 184
 185         err = mlx4_HW2SW_SRQ(dev, NULL, srq->srqn);
 186         if (err)
 187                 mlx4_warn(dev, "HW2SW_SRQ failed (%d) for SRQN %06x\n", err, srq->srqn);
 188
 189         spin_lock_irq(&srq_table->lock);
 190         radix_tree_delete(&srq_table->tree, srq->srqn);
 191         spin_unlock_irq(&srq_table->lock);
 192
 193         if (atomic_dec_and_test(&srq->refcount))
 194                 complete(&srq->free);
 195         wait_for_completion(&srq->free);
 196
 197         mlx4_table_put(dev, &srq_table->table, srq->srqn);
 198         mlx4_bitmap_free(&srq_table->bitmap, srq->srqn);
 199 }
 200 EXPORT_SYMBOL_GPL(mlx4_srq_free);
 201
 202 int mlx4_srq_arm(struct mlx4_dev *dev, struct mlx4_srq *srq, int limit_watermark)
 203 {
 204         return mlx4_ARM_SRQ(dev, srq->srqn, limit_watermark);
 205 }
 206 EXPORT_SYMBOL_GPL(mlx4_srq_arm);
 207
 208 int __devinit mlx4_init_srq_table(struct mlx4_dev *dev)
 209 {
 210         struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 211         int err;
 212
 213         spin_lock_init(&srq_table->lock);
 214         INIT_RADIX_TREE(&srq_table->tree, GFP_ATOMIC);
 215
 216         err = mlx4_bitmap_init(&srq_table->bitmap, dev->caps.num_srqs,
 217                                dev->caps.num_srqs - 1, dev->caps.reserved_srqs);
 218         if (err)
 219                 return err;
 220
 221         return 0;
 222 }
 223
 224 void mlx4_cleanup_srq_table(struct mlx4_dev *dev)
 225 {
 226         mlx4_bitmap_cleanup(&mlx4_priv(dev)->srq_table.bitmap);
 227 }