1. 根目录:
2. drivers
3. net
4. ethernet
5. mellanox
6. mlx4
7. en_cq.c

/*
 * 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 **pcq,
		      int entries, int ring, enum cq_type mode,
		      int node)
{
	struct mlx4_en_dev *mdev = priv->mdev;
	struct mlx4_en_cq *cq;
	int err;

	cq = kzalloc_node(sizeof(*cq), GFP_KERNEL, node);
	if (!cq) {
		cq = kzalloc(sizeof(*cq), GFP_KERNEL);
		if (!cq) {
			en_err(priv, "Failed to allocate CQ structure\n");
			return -ENOMEM;
		}
	}

	cq->size = entries;
	cq->buf_size = cq->size * mdev->dev->caps.cqe_size;

	cq->ring = ring;
	cq->is_tx = mode;
	spin_lock_init(&cq->lock);

	/* Allocate HW buffers on provided NUMA node.
	 * dev->numa_node is used in mtt range allocation flow.
	 */
	set_dev_node(&mdev->dev->pdev->dev, node);
	err = mlx4_alloc_hwq_res(mdev->dev, &cq->wqres,
				cq->buf_size, 2 * PAGE_SIZE);
	set_dev_node(&mdev->dev->pdev->dev, mdev->dev->numa_node);
	if (err)
		goto err_cq;

	err = mlx4_en_map_buffer(&cq->wqres.buf);
	if (err)
		goto err_res;

	cq->buf = (struct mlx4_cqe *)cq->wqres.buf.direct.buf;
	*pcq = cq;

	return 0;

err_res:
	mlx4_free_hwq_res(mdev->dev, &cq->wqres, cq->buf_size);
err_cq:
	kfree(cq);
	*pcq = NULL;
	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];
	int timestamp_en = 0;
	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;

	if ((cq->is_tx && priv->hwtstamp_config.tx_type) ||
	    (!cq->is_tx && priv->hwtstamp_config.rx_filter))
		timestamp_en = 1;

	err = mlx4_cq_alloc(mdev->dev, cq->size, &cq->wqres.mtt,
			    &mdev->priv_uar, cq->wqres.db.dma, &cq->mcq,
			    cq->vector, 0, timestamp_en);
	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_tx_cq,
			       NAPI_POLL_WEIGHT);
	} else {
		netif_napi_add(cq->dev, &cq->napi, mlx4_en_poll_rx_cq, 64);
		napi_hash_add(&cq->napi);
	}

	napi_enable(&cq->napi);

	return 0;
}

void mlx4_en_destroy_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq **pcq)
{
	struct mlx4_en_dev *mdev = priv->mdev;
	struct mlx4_en_cq *cq = *pcq;

	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;
	kfree(cq);
	*pcq = NULL;
}

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