drivers/net/ethernet/mellanox/mlx4/intf.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/slab.h>
  35 #include <linux/export.h>
  36
  37 #include "mlx4.h"
  38
  39 struct mlx4_device_context {
  40         struct list_head        list;
  41         struct mlx4_interface  *intf;
  42         void                   *context;
  43 };
  44
  45 static LIST_HEAD(intf_list);
  46 static LIST_HEAD(dev_list);
  47 static DEFINE_MUTEX(intf_mutex);
  48
  49 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  50 {
  51         struct mlx4_device_context *dev_ctx;
  52
  53         dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
  54         if (!dev_ctx)
  55                 return;
  56
  57         dev_ctx->intf    = intf;
  58         dev_ctx->context = intf->add(&priv->dev);
  59
  60         if (dev_ctx->context) {
  61                 spin_lock_irq(&priv->ctx_lock);
  62                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
  63                 spin_unlock_irq(&priv->ctx_lock);
  64         } else
  65                 kfree(dev_ctx);
  66 }
  67
  68 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  69 {
  70         struct mlx4_device_context *dev_ctx;
  71
  72         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  73                 if (dev_ctx->intf == intf) {
  74                         spin_lock_irq(&priv->ctx_lock);
  75                         list_del(&dev_ctx->list);
  76                         spin_unlock_irq(&priv->ctx_lock);
  77
  78                         intf->remove(&priv->dev, dev_ctx->context);
  79                         kfree(dev_ctx);
  80                         return;
  81                 }
  82 }
  83
  84 int mlx4_register_interface(struct mlx4_interface *intf)
  85 {
  86         struct mlx4_priv *priv;
  87
  88         if (!intf->add || !intf->remove)
  89                 return -EINVAL;
  90
  91         mutex_lock(&intf_mutex);
  92
  93         list_add_tail(&intf->list, &intf_list);
  94         list_for_each_entry(priv, &dev_list, dev_list)
  95                 mlx4_add_device(intf, priv);
  96
  97         mutex_unlock(&intf_mutex);
  98
  99         return 0;
 100 }
 101 EXPORT_SYMBOL_GPL(mlx4_register_interface);
 102
 103 void mlx4_unregister_interface(struct mlx4_interface *intf)
 104 {
 105         struct mlx4_priv *priv;
 106
 107         mutex_lock(&intf_mutex);
 108
 109         list_for_each_entry(priv, &dev_list, dev_list)
 110                 mlx4_remove_device(intf, priv);
 111
 112         list_del(&intf->list);
 113
 114         mutex_unlock(&intf_mutex);
 115 }
 116 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
 117
 118 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type, int port)
 119 {
 120         struct mlx4_priv *priv = mlx4_priv(dev);
 121         struct mlx4_device_context *dev_ctx;
 122         unsigned long flags;
 123
 124         spin_lock_irqsave(&priv->ctx_lock, flags);
 125
 126         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 127                 if (dev_ctx->intf->event)
 128                         dev_ctx->intf->event(dev, dev_ctx->context, type, port);
 129
 130         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 131 }
 132
 133 int mlx4_register_device(struct mlx4_dev *dev)
 134 {
 135         struct mlx4_priv *priv = mlx4_priv(dev);
 136         struct mlx4_interface *intf;
 137
 138         mutex_lock(&intf_mutex);
 139
 140         list_add_tail(&priv->dev_list, &dev_list);
 141         list_for_each_entry(intf, &intf_list, list)
 142                 mlx4_add_device(intf, priv);
 143
 144         mutex_unlock(&intf_mutex);
 145         mlx4_start_catas_poll(dev);
 146
 147         return 0;
 148 }
 149
 150 void mlx4_unregister_device(struct mlx4_dev *dev)
 151 {
 152         struct mlx4_priv *priv = mlx4_priv(dev);
 153         struct mlx4_interface *intf;
 154
 155         mlx4_stop_catas_poll(dev);
 156         mutex_lock(&intf_mutex);
 157
 158         list_for_each_entry(intf, &intf_list, list)
 159                 mlx4_remove_device(intf, priv);
 160
 161         list_del(&priv->dev_list);
 162
 163         mutex_unlock(&intf_mutex);
 164 }
 165
 166 void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port)
 167 {
 168         struct mlx4_priv *priv = mlx4_priv(dev);
 169         struct mlx4_device_context *dev_ctx;
 170         unsigned long flags;
 171         void *result = NULL;
 172
 173         spin_lock_irqsave(&priv->ctx_lock, flags);
 174
 175         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 176                 if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) {
 177                         result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port);
 178                         break;
 179                 }
 180
 181         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 182
 183         return result;
 184 }
 185 EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);