IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters

Add an InfiniBand driver for Mellanox ConnectX adapters.  Because
these adapters can also be used as ethernet NICs and Fibre Channel 
HBAs, the driver is split into two modules: 
 
  mlx4_core: Handles low-level things like device initialization and 
    processing firmware commands.  Also controls resource allocation 
    so that the InfiniBand, ethernet and FC functions can share a 
    device without stepping on each other. 
 
  mlx4_ib: Handles InfiniBand-specific things; plugs into the 
    InfiniBand midlayer. 

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/drivers/net/mlx4/intf.c b/drivers/net/mlx4/intf.c
new file mode 100644
index 000000000000..65854f9e9c76
--- /dev/null
+++ b/drivers/net/mlx4/intf.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/mlx4/driver.h>
+
+#include "mlx4.h"
+
+struct mlx4_device_context {
+        struct list_head        list;
+        struct mlx4_interface  *intf;
+        void                   *context;
+};
+
+static LIST_HEAD(intf_list);
+static LIST_HEAD(dev_list);
+static DEFINE_MUTEX(intf_mutex);
+
+static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
+{
+        struct mlx4_device_context *dev_ctx;
+
+        dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
+        if (!dev_ctx)
+                return;
+
+        dev_ctx->intf    = intf;
+        dev_ctx->context = intf->add(&priv->dev);
+
+        if (dev_ctx->context) {
+                spin_lock_irq(&priv->ctx_lock);
+                list_add_tail(&dev_ctx->list, &priv->ctx_list);
+                spin_unlock_irq(&priv->ctx_lock);
+        } else
+                kfree(dev_ctx);
+}
+
+static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
+{
+        struct mlx4_device_context *dev_ctx;
+
+        list_for_each_entry(dev_ctx, &priv->ctx_list, list)
+                if (dev_ctx->intf == intf) {
+                        spin_lock_irq(&priv->ctx_lock);
+                        list_del(&dev_ctx->list);
+                        spin_unlock_irq(&priv->ctx_lock);
+
+                        intf->remove(&priv->dev, dev_ctx->context);
+                        kfree(dev_ctx);
+                        return;
+                }
+}
+
+int mlx4_register_interface(struct mlx4_interface *intf)
+{
+        struct mlx4_priv *priv;
+
+        if (!intf->add || !intf->remove)
+                return -EINVAL;
+
+        mutex_lock(&intf_mutex);
+
+        list_add_tail(&intf->list, &intf_list);
+        list_for_each_entry(priv, &dev_list, dev_list)
+                mlx4_add_device(intf, priv);
+
+        mutex_unlock(&intf_mutex);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_register_interface);
+
+void mlx4_unregister_interface(struct mlx4_interface *intf)
+{
+        struct mlx4_priv *priv;
+
+        mutex_lock(&intf_mutex);
+
+        list_for_each_entry(priv, &dev_list, dev_list)
+                mlx4_remove_device(intf, priv);
+
+        list_del(&intf->list);
+
+        mutex_unlock(&intf_mutex);
+}
+EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
+
+void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_event type,
+                         int subtype, int port)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_device_context *dev_ctx;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->ctx_lock, flags);
+
+        list_for_each_entry(dev_ctx, &priv->ctx_list, list)
+                if (dev_ctx->intf->event)
+                        dev_ctx->intf->event(dev, dev_ctx->context, type,
+                                             subtype, port);
+
+        spin_unlock_irqrestore(&priv->ctx_lock, flags);
+}
+
+int mlx4_register_device(struct mlx4_dev *dev)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_interface *intf;
+
+        INIT_LIST_HEAD(&priv->ctx_list);
+        spin_lock_init(&priv->ctx_lock);
+
+        mutex_lock(&intf_mutex);
+
+        list_add_tail(&priv->dev_list, &dev_list);
+        list_for_each_entry(intf, &intf_list, list)
+                mlx4_add_device(intf, priv);
+
+        mutex_unlock(&intf_mutex);
+
+        return 0;
+}
+
+void mlx4_unregister_device(struct mlx4_dev *dev)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_interface *intf;
+
+        mutex_lock(&intf_mutex);
+
+        list_for_each_entry(intf, &intf_list, list)
+                mlx4_remove_device(intf, priv);
+
+        list_del(&priv->dev_list);
+
+        mutex_unlock(&intf_mutex);
+}