path: root/drivers/net/ethernet/mellanox/mlx4/en_rx.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/slab.h>
#include <linux/mlx4/qp.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/vmalloc.h>

#include "mlx4_en.h"

static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
			       struct mlx4_en_rx_desc *rx_desc,
			       struct mlx4_en_rx_alloc *frags,
			       struct mlx4_en_rx_alloc *ring_alloc)
{
	struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
	struct mlx4_en_frag_info *frag_info;
	struct page *page;
	dma_addr_t dma;
	int i;

	for (i = 0; i < priv->num_frags; i++) {
		frag_info = &priv->frag_info[i];
		if (ring_alloc[i].offset == frag_info->last_offset) {
			page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
					MLX4_EN_ALLOC_ORDER);
			if (!page)
				goto out;
			dma = dma_map_page(priv->ddev, page, 0,
				MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
			if (dma_mapping_error(priv->ddev, dma)) {
				put_page(page);
				goto out;
			}
			page_alloc[i].page = page;
			page_alloc[i].dma = dma;
			page_alloc[i].offset = frag_info->frag_align;
		} else {
			page_alloc[i].page = ring_alloc[i].page;
			get_page(ring_alloc[i].page);
			page_alloc[i].dma = ring_alloc[i].dma;
			page_alloc[i].offset = ring_alloc[i].offset +
						frag_info->frag_stride;
		}
	}

	for (i = 0; i < priv->num_frags; i++) {
		frags[i] = ring_alloc[i];
		dma = ring_alloc[i].dma + ring_alloc[i].offset;
		ring_alloc[i] = page_alloc[i];
		rx_desc->data[i].addr = cpu_to_be64(dma);
	}

	return 0;


out:
	while (i--) {
		frag_info = &priv->frag_info[i];
		if (ring_alloc[i].offset == frag_info->last_offset)
			dma_unmap_page(priv->ddev, page_alloc[i].dma,
				MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
		put_page(page_alloc[i].page);
	}
	return -ENOMEM;
}

static void mlx4_en_free_frag(struct mlx4_en_priv *priv,
			      struct mlx4_en_rx_alloc *frags,
			      int i)
{
	struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];

	if (frags[i].offset == frag_info->last_offset) {
		dma_unmap_page(priv->ddev, frags[i].dma, MLX4_EN_ALLOC_SIZE,
					 PCI_DMA_FROMDEVICE);
	}
	if (frags[i].page)
		put_page(frags[i].page);
}

static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
				  struct mlx4_en_rx_ring *ring)
{
	struct mlx4_en_rx_alloc *page_alloc;
	int i;

	for (i = 0; i < priv->num_frags; i++) {
		page_alloc = &ring->page_alloc[i];
		page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
					       MLX4_EN_ALLOC_ORDER);
		if (!page_alloc->page)
			goto out;

		page_alloc->dma = dma_map_page(priv->ddev, page_alloc->page, 0,
					MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
		if (dma_mapping_error(priv->