en_cq.c

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/*
 * 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;
    cq->buf_size = cq->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);
    else
        cq->buf = (struct mlx4_cqe *) cq->wqres.buf.direct.buf;

    return err;
}

int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
            int cq_idx)
{
    struct mlx4_en_dev *mdev = priv->mdev;
    int err = 0;
    char name[25];
    struct cpu_rmap *rmap =
#ifdef CONFIG_RFS_ACCEL
        priv->dev->rx_cpu_rmap;
#else
        NULL;
#endif

    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;
    memset(cq->buf, 0, cq->buf_size);

    if (cq->is_tx == RX) {
        if (mdev->dev->caps.comp_pool) {
            if (!cq->vector) {
                sprintf(name, "%s-%d", priv->dev->name,
                    cq->ring);
                /* Set IRQ for specific name (per ring) */
                if (mlx4_assign_eq(mdev->dev, name, rmap,
                           &cq->vector)) {
                    cq->vector = (cq->ring + 1 + priv->port)
                        % mdev->dev->caps.num_comp_vectors;
                    mlx4_warn(mdev, "Failed Assigning an EQ to "
                          "%s ,Falling back to legacy EQ's\n",
                          name);
                }
            }
        } else {
            cq->vector = (cq->ring + 1 + priv->port) %
                mdev->dev->caps.num_comp_vectors;
        }
    } else {
        /* For TX we use the same irq per
        ring we assigned for the RX    */
        struct mlx4_en_cq *rx_cq;

        cq_idx = cq_idx % priv->rx_ring_num;
        rx_cq = &priv->rx_cq[cq_idx];
        cq->vector = rx_cq->vector;
    }

    if (!cq->is_tx)
        cq->size = priv->rx_ring[cq->ring].actual_size;

    err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt, &mdev->priv_uar,
                cq->wqres.db.dma, &cq->mcq, cq->vector, 0);
    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) {
        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);
    if (priv->mdev->dev->caps.comp_pool && cq->vector)
        mlx4_release_eq(priv->mdev->dev, cq->vector);
    cq->vector = 0;
    cq->buf_size = 0;
    cq->buf = NULL;
}

void mlx4_en_deactivate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq)
{
    if (!cq->is_tx) {
        napi_disable(&cq->napi);
        netif_napi_del(&cq->napi);
    }

    mlx4_cq_free(priv->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)
{
    mlx4_cq_arm(&cq->mcq, MLX4_CQ_DB_REQ_NOT, priv->mdev->uar_map,
            &priv->mdev->uar_lock);

    return 0;
}