linux-imx

/*

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version 2

 * as published by the Free Software Foundation; or, when distributed

 * separately from the Linux kernel or incorporated into other

 * software packages, subject to the following license:

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this source file (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use, copy, modify,

 * merge, publish, distribute, sublicense, and/or sell copies of the Software,

 * and to permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * 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.

 */

​

#ifndef __XEN_NETBACK__COMMON_H__

#define __XEN_NETBACK__COMMON_H__

​

#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

​

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/slab.h>

#include <linux/ip.h>

#include <linux/in.h>

#include <linux/io.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/wait.h>

#include <linux/sched.h>

​

#include <xen/interface/io/netif.h>

#include <xen/interface/grant_table.h>

#include <xen/grant_table.h>

#include <xen/xenbus.h>

#include <xen/page.h>

#include <linux/debugfs.h>

​

typedef unsigned int pending_ring_idx_t;

#define INVALID_PENDING_RING_IDX (~0U)

​

struct pending_tx_info {

    struct xen_netif_tx_request req; /* tx request */

    unsigned int extra_count;

    /* Callback data for released SKBs. The callback is always

     * xenvif_zerocopy_callback, desc contains the pending_idx, which is

     * also an index in pending_tx_info array. It is initialized in

     * xenvif_alloc and it never changes.

     * skb_shinfo(skb)->destructor_arg points to the first mapped slot's

     * callback_struct in this array of struct pending_tx_info's, then ctx

     * to the next, or NULL if there is no more slot for this skb.

     * ubuf_to_vif is a helper which finds the struct xenvif from a pointer