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 #include <linux/errno.h>
  37
  38 #include "mlx4.h"
  39
  40 struct mlx4_device_context {
  41         struct list_head        list;
  42         struct list_head        bond_list;
  43         struct mlx4_interface  *intf;
  44         void                   *context;
  45 };
  46
  47 static LIST_HEAD(intf_list);
  48 static LIST_HEAD(dev_list);
  49 static DEFINE_MUTEX(intf_mutex);
  50
  51 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  52 {
  53         struct mlx4_device_context *dev_ctx;
  54
  55         dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
  56         if (!dev_ctx)
  57                 return;
  58
  59         dev_ctx->intf    = intf;
  60         dev_ctx->context = intf->add(&priv->dev);
  61
  62         if (dev_ctx->context) {
  63                 spin_lock_irq(&priv->ctx_lock);
  64                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
  65                 spin_unlock_irq(&priv->ctx_lock);
  66         } else
  67                 kfree(dev_ctx);
  68 }
  69
  70 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  71 {
  72         struct mlx4_device_context *dev_ctx;
  73
  74         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  75                 if (dev_ctx->intf == intf) {
  76                         spin_lock_irq(&priv->ctx_lock);
  77                         list_del(&dev_ctx->list);
  78                         spin_unlock_irq(&priv->ctx_lock);
  79
  80                         intf->remove(&priv->dev, dev_ctx->context);
  81                         kfree(dev_ctx);
  82                         return;
  83                 }
  84 }
  85
  86 int mlx4_register_interface(struct mlx4_interface *intf)
  87 {
  88         struct mlx4_priv *priv;
  89
  90         if (!intf->add || !intf->remove)
  91                 return -EINVAL;
  92
  93         mutex_lock(&intf_mutex);
  94
  95         list_add_tail(&intf->list, &intf_list);
  96         list_for_each_entry(priv, &dev_list, dev_list)
  97                 mlx4_add_device(intf, priv);
  98
  99         mutex_unlock(&intf_mutex);
 100
 101         return 0;
 102 }
 103 EXPORT_SYMBOL_GPL(mlx4_register_interface);
 104
 105 void mlx4_unregister_interface(struct mlx4_interface *intf)
 106 {
 107         struct mlx4_priv *priv;
 108
 109         mutex_lock(&intf_mutex);
 110
 111         list_for_each_entry(priv, &dev_list, dev_list)
 112                 mlx4_remove_device(intf, priv);
 113
 114         list_del(&intf->list);
 115
 116         mutex_unlock(&intf_mutex);
 117 }
 118 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
 119
 120 int mlx4_do_bond(struct mlx4_dev *dev, bool enable)
 121 {
 122         struct mlx4_priv *priv = mlx4_priv(dev);
 123         struct mlx4_device_context *dev_ctx = NULL, *temp_dev_ctx;
 124         unsigned long flags;
 125         int ret;
 126         LIST_HEAD(bond_list);
 127
 128         if (!(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_PORT_REMAP))
 129                 return -ENOTSUPP;
 130
 131         ret = mlx4_disable_rx_port_check(dev, enable);
 132         if (ret) {
 133                 mlx4_err(dev, "Fail to %s rx port check\n",
 134                          enable ? "enable" : "disable");
 135                 return ret;
 136         }
 137         if (enable) {
 138                 dev->flags |= MLX4_FLAG_BONDED;
 139         } else {
 140                  ret = mlx4_virt2phy_port_map(dev, 1, 2);
 141                 if (ret) {
 142                         mlx4_err(dev, "Fail to reset port map\n");
 143                         return ret;
 144                 }
 145                 dev->flags &= ~MLX4_FLAG_BONDED;
 146         }
 147
 148         spin_lock_irqsave(&priv->ctx_lock, flags);
 149         list_for_each_entry_safe(dev_ctx, temp_dev_ctx, &priv->ctx_list, list) {
 150                 if (dev_ctx->intf->flags & MLX4_INTFF_BONDING) {
 151                         list_add_tail(&dev_ctx->bond_list, &bond_list);
 152                         list_del(&dev_ctx->list);
 153                 }
 154         }
 155         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 156
 157         list_for_each_entry(dev_ctx, &bond_list, bond_list) {
 158                 dev_ctx->intf->remove(dev, dev_ctx->context);
 159                 dev_ctx->context =  dev_ctx->intf->add(dev);
 160
 161                 spin_lock_irqsave(&priv->ctx_lock, flags);
 162                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
 163                 spin_unlock_irqrestore(&priv->ctx_lock, flags);
 164
 165                 mlx4_dbg(dev, "Inrerface for protocol %d restarted with when bonded mode is %s\n",
 166                          dev_ctx->intf->protocol, enable ?
 167                          "enabled" : "disabled");
 168         }
 169         return 0;
 170 }
 171
 172 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type,
 173                          unsigned long param)
 174 {
 175         struct mlx4_priv *priv = mlx4_priv(dev);
 176         struct mlx4_device_context *dev_ctx;
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(&priv->ctx_lock, flags);
 180
 181         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 182                 if (dev_ctx->intf->event)
 183                         dev_ctx->intf->event(dev, dev_ctx->context, type, param);
 184
 185         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 186 }
 187
 188 int mlx4_register_device(struct mlx4_dev *dev)
 189 {
 190         struct mlx4_priv *priv = mlx4_priv(dev);
 191         struct mlx4_interface *intf;
 192
 193         mutex_lock(&intf_mutex);
 194
 195         dev->persist->interface_state |= MLX4_INTERFACE_STATE_UP;
 196         list_add_tail(&priv->dev_list, &dev_list);
 197         list_for_each_entry(intf, &intf_list, list)
 198                 mlx4_add_device(intf, priv);
 199
 200         mutex_unlock(&intf_mutex);
 201         mlx4_start_catas_poll(dev);
 202
 203         return 0;
 204 }
 205
 206 void mlx4_unregister_device(struct mlx4_dev *dev)
 207 {
 208         struct mlx4_priv *priv = mlx4_priv(dev);
 209         struct mlx4_interface *intf;
 210
 211         mlx4_stop_catas_poll(dev);
 212         mutex_lock(&intf_mutex);
 213
 214         list_for_each_entry(intf, &intf_list, list)
 215                 mlx4_remove_device(intf, priv);
 216
 217         list_del(&priv->dev_list);
 218         dev->persist->interface_state &= ~MLX4_INTERFACE_STATE_UP;
 219
 220         mutex_unlock(&intf_mutex);
 221 }
 222
 223 void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port)
 224 {
 225         struct mlx4_priv *priv = mlx4_priv(dev);
 226         struct mlx4_device_context *dev_ctx;
 227         unsigned long flags;
 228         void *result = NULL;
 229
 230         spin_lock_irqsave(&priv->ctx_lock, flags);
 231
 232         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 233                 if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) {
 234                         result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port);
 235                         break;
 236                 }
 237
 238         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 239
 240         return result;
 241 }
 242 EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);