mlx4_en: Add driver for Mellanox ConnectX 10GbE NIC

The Mellanox ConnectX can operate as an InfiniBand adapter, as an
Ethernet NIC, or as a Fibre Channel (FC) HBA.  The kernel has a
low-level driver, mlx4_core, which handles multiplexing access to the
device, and there is also already an InfiniBad driver, mlx4_ib.

This patch adds a new driver, mlx4_en, which implements a standard
Ethernet NIC driver.

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

1 files changed, 254 insertions, 0 deletions

diff --git a/drivers/net/mlx4/en_main.c b/drivers/net/mlx4/en_main.c
new file mode 100644
index 000000000000..1b0eebf84f76
--- /dev/null
+++ b/drivers/net/mlx4/en_main.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2007 Mellanox Technologies. 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/cpumask.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/cpumask.h>
+
+#include <linux/mlx4/driver.h>
+#include <linux/mlx4/device.h>
+#include <linux/mlx4/cmd.h>
+
+#include "mlx4_en.h"
+
+MODULE_AUTHOR("Liran Liss, Yevgeny Petrilin");
+MODULE_DESCRIPTION("Mellanox ConnectX HCA Ethernet driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRV_VERSION " ("DRV_RELDATE")");
+
+static const char mlx4_en_version[] =
+        DRV_NAME ": Mellanox ConnectX HCA Ethernet driver v"
+        DRV_VERSION " (" DRV_RELDATE ")\n";
+
+static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr,
+                          enum mlx4_dev_event event, int port)
+{
+        struct mlx4_en_dev *mdev = (struct mlx4_en_dev *) endev_ptr;
+        struct mlx4_en_priv *priv;
+
+        if (!mdev->pndev[port])
+                return;
+
+        priv = netdev_priv(mdev->pndev[port]);
+        switch (event) {
+        case MLX4_DEV_EVENT_PORT_UP:
+        case MLX4_DEV_EVENT_PORT_DOWN:
+                /* To prevent races, we poll the link state in a separate
+                  task rather than changing it here */
+                priv->link_state = event;
+                queue_work(mdev->workqueue, &priv->linkstate_task);
+                break;
+
+        case MLX4_DEV_EVENT_CATASTROPHIC_ERROR:
+                mlx4_err(mdev, "Internal error detected, restarting device\n");
+                break;
+
+        default:
+                mlx4_warn(mdev, "Unhandled event: %d\n", event);
+        }
+}
+
+static void mlx4_en_remove(struct mlx4_dev *dev, void *endev_ptr)
+{
+        struct mlx4_en_dev *mdev = endev_ptr;
+        int i;
+
+        mutex_lock(&mdev->state_lock);
+        mdev->device_up = false;
+        mutex_unlock(&mdev->state_lock);
+
+        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
+                if (mdev->pndev[i])
+                        mlx4_en_destroy_netdev(mdev->pndev[i]);
+
+        flush_workqueue(mdev->workqueue);
+        destroy_workqueue(mdev->workqueue);
+        mlx4_mr_free(dev, &mdev->mr);
+        mlx4_uar_free(dev, &mdev->priv_uar);
+        mlx4_pd_free(dev, mdev->priv_pdn);
+        kfree(mdev);
+}
+
+static void *mlx4_en_add(struct mlx4_dev *dev)
+{
+        static int mlx4_en_version_printed;
+        struct mlx4_en_dev *mdev;
+        int i;
+        int err;
+
+        if (!mlx4_en_version_printed) {
+                printk(KERN_INFO "%s", mlx4_en_version);
+                mlx4_en_version_printed++;
+        }
+
+        mdev = kzalloc(sizeof *mdev, GFP_KERNEL);
+        if (!mdev) {
+                dev_err(&dev->pdev->dev, "Device struct alloc failed, "
+                        "aborting.\n");
+                err = -ENOMEM;
+                goto err_free_res;
+        }
+
+        if (mlx4_pd_alloc(dev, &mdev->priv_pdn))
+                goto err_free_dev;
+
+        if (mlx4_uar_alloc(dev, &mdev->priv_uar))
+                goto err_pd;
+
+        mdev->uar_map = ioremap(mdev->priv_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
+        if (!mdev->uar_map)
+                goto err_uar;
+        spin_lock_init(&mdev->uar_lock);
+
+        mdev->dev = dev;
+        mdev->dma_device = &(dev->pdev->dev);
+        mdev->pdev = dev->pdev;
+        mdev->device_up = false;
+
+        mdev->LSO_support = !!(dev->caps.flags & (1 << 15));
+        if (!mdev->LSO_support)
+                mlx4_warn(mdev, "LSO not supported, please upgrade to later "
+                                "FW version to enable LSO\n");
+
+        if (mlx4_mr_alloc(mdev->dev, mdev->priv_pdn, 0, ~0ull,
+                         MLX4_PERM_LOCAL_WRITE |  MLX4_PERM_LOCAL_READ,
+                         0, 0, &mdev->mr)) {
+                mlx4_err(mdev, "Failed allocating memory region\n");
+                goto err_uar;
+        }
+        if (mlx4_mr_enable(mdev->dev, &mdev->mr)) {
+                mlx4_err(mdev, "Failed enabling memory region\n");
+                goto err_mr;
+        }
+
+        /* Build device profile according to supplied module parameters */
+        err = mlx4_en_get_profile(mdev);
+        if (err) {
+                mlx4_err(mdev, "Bad module parameters, aborting.\n");
+                goto err_mr;
+        }
+
+        /* Configure wich ports to start according to module parameters */
+        mdev->port_cnt = 0;
+        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH)
+                mdev->port_cnt++;
+
+        /* If we did not receive an explicit number of Rx rings, default to
+         * the number of completion vectors populated by the mlx4_core */
+        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
+                mlx4_info(mdev, "Using %d tx rings for port:%d\n",
+                          mdev->profile.prof[i].tx_ring_num, i);
+                if (!mdev->profile.prof[i].rx_ring_num) {
+                        mdev->profile.prof[i].rx_ring_num = 1;
+                        mlx4_info(mdev, "Defaulting to %d rx rings for port:%d\n",
+                                  1, i);
+                } else
+                        mlx4_info(mdev, "Using %d rx rings for port:%d\n",
+                                  mdev->profile.prof[i].rx_ring_num, i);
+        }
+
+        /* Create our own workqueue for reset/multicast tasks
+         * Note: we cannot use the shared workqueue because of deadlocks caused
+         *       by the rtnl lock */
+        mdev->workqueue = create_singlethread_workqueue("mlx4_en");
+        if (!mdev->workqueue) {
+                err = -ENOMEM;
+                goto err_close_nic;
+        }
+
+        /* At this stage all non-port specific tasks are complete:
+         * mark the card state as up */
+        mutex_init(&mdev->state_lock);
+        mdev->device_up = true;
+
+        /* Setup ports */
+
+        /* Create a netdev for each port */
+        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
+                mlx4_info(mdev, "Activating port:%d\n", i);
+                if (mlx4_en_init_netdev(mdev, i, &mdev->profile.prof[i])) {
+                        mdev->pndev[i] = NULL;
+                        goto err_free_netdev;
+                }
+        }
+        return mdev;
+
+
+err_free_netdev:
+        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
+                if (mdev->pndev[i])
+                        mlx4_en_destroy_netdev(mdev->pndev[i]);
+        }
+
+        mutex_lock(&mdev->state_lock);
+        mdev->device_up = false;
+        mutex_unlock(&mdev->state_lock);
+        flush_workqueue(mdev->workqueue);
+
+        /* Stop event queue before we drop down to release shared SW state */
+
+err_close_nic:
+        destroy_workqueue(mdev->workqueue);
+err_mr:
+        mlx4_mr_free(dev, &mdev->mr);
+err_uar:
+        mlx4_uar_free(dev, &mdev->priv_uar);
+err_pd:
+        mlx4_pd_free(dev, mdev->priv_pdn);
+err_free_dev:
+        kfree(mdev);
+err_free_res:
+        return NULL;
+}
+
+static struct mlx4_interface mlx4_en_interface = {
+        .add    = mlx4_en_add,
+        .remove = mlx4_en_remove,
+        .event  = mlx4_en_event,
+};
+
+static int __init mlx4_en_init(void)
+{
+        return mlx4_register_interface(&mlx4_en_interface);
+}
+
+static void __exit mlx4_en_cleanup(void)
+{
+        mlx4_unregister_interface(&mlx4_en_interface);
+}
+
+module_init(mlx4_en_init);
+module_exit(mlx4_en_cleanup);
+