mlx4_core: Add link type autosensing

When a port's link is down (except to driver restart) and the port is
configured for auto sensing, we try to sense port link type (Ethernet
or InfiniBand) in order to determine how to initialize the port.  If
the port type needs to be changed, all mlx4 for the device interfaces
are unregistered and then registered again with the new port
types.  Sensing is done with intervals of 3 seconds.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 77 insertions, 27 deletions

diff --git a/drivers/net/mlx4/main.c b/drivers/net/mlx4/main.c
index 8480f0346844..a66f5b2fd288 100644
--- a/drivers/net/mlx4/main.c
+++ b/drivers/net/mlx4/main.c
@@ -51,6 +51,8 @@ MODULE_DESCRIPTION("Mellanox ConnectX HCA low-level driver");
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_VERSION(DRV_VERSION);
 
+struct workqueue_struct *mlx4_wq;
+
 #ifdef CONFIG_MLX4_DEBUG
 
 int mlx4_debug_level = 0;
@@ -98,24 +100,23 @@ module_param_named(use_prio, use_prio, bool, 0444);
 MODULE_PARM_DESC(use_prio, "Enable steering by VLAN priority on ETH ports "
                   "(0/1, default 0)");
 
-static int mlx4_check_port_params(struct mlx4_dev *dev,
-                                  enum mlx4_port_type *port_type)
+int mlx4_check_port_params(struct mlx4_dev *dev,
+                           enum mlx4_port_type *port_type)
 {
         int i;
 
         for (i = 0; i < dev->caps.num_ports - 1; i++) {
-                if (port_type[i] != port_type[i+1] &&
-                    !(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP)) {
-                        mlx4_err(dev, "Only same port types supported "
-                                 "on this HCA, aborting.\n");
-                        return -EINVAL;
+                if (port_type[i] != port_type[i + 1]) {
+                        if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP)) {
+                                mlx4_err(dev, "Only same port types supported "
+                                         "on this HCA, aborting.\n");
+                                return -EINVAL;
+                        }
+                        if (port_type[i] == MLX4_PORT_TYPE_ETH &&
+                            port_type[i + 1] == MLX4_PORT_TYPE_IB)
+                                return -EINVAL;
                 }
         }
-        if ((port_type[0] == MLX4_PORT_TYPE_ETH) &&
-            (port_type[1] == MLX4_PORT_TYPE_IB)) {
-                mlx4_err(dev, "eth-ib configuration is not supported.\n");
-                return -EINVAL;
-        }
 
         for (i = 0; i < dev->caps.num_ports; i++) {
                 if (!(port_type[i] & dev->caps.supported_type[i+1])) {
@@ -225,6 +226,9 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
                         dev->caps.port_type[i] = MLX4_PORT_TYPE_IB;
                 else
                         dev->caps.port_type[i] = MLX4_PORT_TYPE_ETH;
+                dev->caps.possible_type[i] = dev->caps.port_type[i];
+                mlx4_priv(dev)->sense.sense_allowed[i] =
+                        dev->caps.supported_type[i] == MLX4_PORT_TYPE_AUTO;
 
                 if (dev->caps.log_num_macs > dev_cap->log_max_macs[i]) {
                         dev->caps.log_num_macs = dev_cap->log_max_macs[i];
@@ -263,14 +267,16 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
  * Change the port configuration of the device.
  * Every user of this function must hold the port mutex.
  */
-static int mlx4_change_port_types(struct mlx4_dev *dev,
-                                  enum mlx4_port_type *port_types)
+int mlx4_change_port_types(struct mlx4_dev *dev,
+                           enum mlx4_port_type *port_types)
 {
         int err = 0;
         int change = 0;
         int port;
 
         for (port = 0; port <  dev->caps.num_ports; port++) {
+                /* Change the port type only if the new type is different
+                 * from the current, and not set to Auto */
                 if (port_types[port] != dev->caps.port_type[port + 1]) {
                         change = 1;
                         dev->caps.port_type[port + 1] = port_types[port];
@@ -302,10 +308,17 @@ static ssize_t show_port_type(struct device *dev,
         struct mlx4_port_info *info = container_of(attr, struct mlx4_port_info,
                                                    port_attr);
         struct mlx4_dev *mdev = info->dev;
+        char type[8];
+
+        sprintf(type, "%s",
+                (mdev->caps.port_type[info->port] == MLX4_PORT_TYPE_IB) ?
+                "ib" : "eth");
+        if (mdev->caps.possible_type[info->port] == MLX4_PORT_TYPE_AUTO)
+                sprintf(buf, "auto (%s)\n", type);
+        else
+                sprintf(buf, "%s\n", type);
 
-        return sprintf(buf, "%s\n",
-                       mdev->caps.port_type[info->port] == MLX4_PORT_TYPE_IB ?
-                       "ib" : "eth");
+        return strlen(buf);
 }
 
 static ssize_t set_port_type(struct device *dev,
@@ -317,6 +330,7 @@ static ssize_t set_port_type(struct device *dev,
         struct mlx4_dev *mdev = info->dev;
         struct mlx4_priv *priv = mlx4_priv(mdev);
         enum mlx4_port_type types[MLX4_MAX_PORTS];
+        enum mlx4_port_type new_types[MLX4_MAX_PORTS];
         int i;
         int err = 0;
 
@@ -324,26 +338,56 @@ static ssize_t set_port_type(struct device *dev,
                 info->tmp_type = MLX4_PORT_TYPE_IB;
         else if (!strcmp(buf, "eth\n"))
                 info->tmp_type = MLX4_PORT_TYPE_ETH;
+        else if (!strcmp(buf, "auto\n"))
+                info->tmp_type = MLX4_PORT_TYPE_AUTO;
         else {
                 mlx4_err(mdev, "%s is not supported port type\n", buf);
                 return -EINVAL;
         }
 
+        mlx4_stop_sense(mdev);
         mutex_lock(&priv->port_mutex);
-        for (i = 0; i < mdev->caps.num_ports; i++)
+        /* Possible type is always the one that was delivered */
+        mdev->caps.possible_type[info->port] = info->tmp_type;
+
+        for (i = 0; i < mdev->caps.num_ports; i++) {
                 types[i] = priv->port[i+1].tmp_type ? priv->port[i+1].tmp_type :
-                                        mdev->caps.port_type[i+1];
+                                        mdev->caps.possible_type[i+1];
+                if (types[i] == MLX4_PORT_TYPE_AUTO)
+                        types[i] = mdev->caps.port_type[i+1];
+        }
 
-        err = mlx4_check_port_params(mdev, types);
+        if (!(mdev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP)) {
+                for (i = 1; i <= mdev->caps.num_ports; i++) {
+                        if (mdev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
+                                mdev->caps.possible_type[i] = mdev->caps.port_type[i];
+                                err = -EINVAL;
+                        }
+                }
+        }
+        if (err) {
+                mlx4_err(mdev, "Auto sensing is not supported on this HCA. "
+                               "Set only 'eth' or 'ib' for both ports "
+                               "(should be the same)\n");
+                goto out;
+        }
+
+        mlx4_do_sense_ports(mdev, new_types, types);
+
+        err = mlx4_check_port_params(mdev, new_types);
         if (err)
                 goto out;
 
-        for (i = 1; i <= mdev->caps.num_ports; i++)
-                priv->port[i].tmp_type = 0;
+        /* We are about to apply the changes after the configuration
+         * was verified, no need to remember the temporary types
+         * any more */
+        for (i = 0; i < mdev->caps.num_ports; i++)
+                priv->port[i + 1].tmp_type = 0;
 
-        err = mlx4_change_port_types(mdev, types);
+        err = mlx4_change_port_types(mdev, new_types);
 
 out:
+        mlx4_start_sense(mdev);
         mutex_unlock(&priv->port_mutex);
         return err ? err : count;
 }
@@ -1117,6 +1161,9 @@ static int __mlx4_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
         if (err)
                 goto err_port;
 
+        mlx4_sense_init(dev);
+        mlx4_start_sense(dev);
+
         pci_set_drvdata(pdev, dev);
 
         return 0;
@@ -1182,6 +1229,7 @@ static void mlx4_remove_one(struct pci_dev *pdev)
         int p;
 
         if (dev) {
+                mlx4_stop_sense(dev);
                 mlx4_unregister_device(dev);
 
                 for (p = 1; p <= dev->caps.num_ports; p++) {
@@ -1266,9 +1314,11 @@ static int __init mlx4_init(void)
         if (mlx4_verify_params())
                 return -EINVAL;
 
-        ret = mlx4_catas_init();
-        if (ret)
-                return ret;
+        mlx4_catas_init();
+
+        mlx4_wq = create_singlethread_workqueue("mlx4");
+        if (!mlx4_wq)
+                return -ENOMEM;
 
         ret = pci_register_driver(&mlx4_driver);
         return ret < 0 ? ret : 0;
@@ -1277,7 +1327,7 @@ static int __init mlx4_init(void)
 static void __exit mlx4_cleanup(void)
 {
         pci_unregister_driver(&mlx4_driver);
-        mlx4_catas_cleanup();
+        destroy_workqueue(mlx4_wq);
 }
 
 module_init(mlx4_init);