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, 146 insertions, 0 deletions

diff --git a/drivers/net/mlx4/en_cq.c b/drivers/net/mlx4/en_cq.c
new file mode 100644
index 000000000000..1368a8010af4
--- /dev/null
+++ b/drivers/net/mlx4/en_cq.c
@@ -0,0 +1,146 @@
+/*
+ * 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/mlx4/cq.h>
+#include <linux/mlx4/qp.h>
+#include <linux/mlx4/cmd.h>
+
+#include "mlx4_en.h"
+
+static void mlx4_en_cq_event(struct mlx4_cq *cq, enum mlx4_event event)
+{
+        return;
+}
+
+
+int mlx4_en_create_cq(struct mlx4_en_priv *priv,
+                      struct mlx4_en_cq *cq,
+                      int entries, int ring, enum cq_type mode)
+{
+        struct mlx4_en_dev *mdev = priv->mdev;
+        int err;
+
+        cq->size = entries;
+        if (mode == RX)
+                cq->buf_size = cq->size * sizeof(struct mlx4_cqe);
+        else
+                cq->buf_size = sizeof(struct mlx4_cqe);
+
+        cq->ring = ring;
+        cq->is_tx = mode;
+        spin_lock_init(&cq->lock);
+
+        err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
+                                cq->buf_size, 2 * PAGE_SIZE);
+        if (err)
+                return err;
+
+        err = mlx4_en_map_buffer(&cq->wqres.buf);
+        if (err)
+                mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
+
+        return err;
+}
+
+int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
+{
+        struct mlx4_en_dev *mdev = priv->mdev;
+        int err;
+
+        cq->dev = mdev->pndev[priv->port];
+        cq->mcq.set_ci_db  = cq->wqres.db.db;
+        cq->mcq.arm_db     = cq->wqres.db.db + 1;
+        *cq->mcq.set_ci_db = 0;
+        *cq->mcq.arm_db    = 0;
+        cq->buf = (struct mlx4_cqe *) cq->wqres.buf.direct.buf;
+        memset(cq->buf, 0, cq->buf_size);
+
+        err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt, &mdev->priv_uar,
+                            cq->wqres.db.dma, &cq->mcq, cq->is_tx);
+        if (err)
+                return err;
+
+        cq->mcq.comp  = cq->is_tx ? mlx4_en_tx_irq : mlx4_en_rx_irq;
+        cq->mcq.event = mlx4_en_cq_event;
+
+        if (cq->is_tx) {
+                init_timer(&cq->timer);
+                cq->timer.function = mlx4_en_poll_tx_cq;
+                cq->timer.data = (unsigned long) cq;
+        } else {
+                netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
+                napi_enable(&cq->napi);
+        }
+
+        return 0;
+}
+
+void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
+{
+        struct mlx4_en_dev *mdev = priv->mdev;
+
+        mlx4_en_unmap_buffer(&cq->wqres.buf);
+        mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
+        cq->buf_size = 0;
+        cq->buf = NULL;
+}
+
+void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
+{
+        struct mlx4_en_dev *mdev = priv->mdev;
+
+        if (cq->is_tx)
+                del_timer(&cq->timer);
+        else
+                napi_disable(&cq->napi);
+
+        mlx4_cq_free(mdev->dev, &cq->mcq);
+}
+
+/* Set rx cq moderation parameters */
+int mlx4_en_set_cq_moder(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
+{
+        return mlx4_cq_modify(priv->mdev->dev, &cq->mcq,
+                              cq->moder_cnt, cq->moder_time);
+}
+
+int mlx4_en_arm_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
+{
+        cq->armed = 1;
+        mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
+                    &priv->mdev->uar_lock);
+
+        return 0;
+}
+
+