linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/* drivers/net/ifb.c:

​

    The purpose of this driver is to provide a device that allows

    for sharing of resources:

​

    1) qdiscs/policies that are per device as opposed to system wide.

    ifb allows for a device which can be redirected to thus providing

    an impression of sharing.

​

    2) Allows for queueing incoming traffic for shaping instead of

    dropping.

​

    The original concept is based on what is known as the IMQ

    driver initially written by Martin Devera, later rewritten

    by Patrick McHardy and then maintained by Andre Correa.

​

    You need the tc action  mirror or redirect to feed this device

        packets.

​

​

    Authors:    Jamal Hadi Salim (2005)

​

*/

​

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/moduleparam.h>

#include <net/pkt_sched.h>

#include <net/net_namespace.h>

​

#define TX_Q_LIMIT    32

struct ifb_q_private {

    struct net_device   *dev;

    struct tasklet_struct   ifb_tasklet;

    int         tasklet_pending;

    int         txqnum;

    struct sk_buff_head     rq;

    u64         rx_packets;

    u64         rx_bytes;

    struct u64_stats_sync   rsync;

​

    struct u64_stats_sync   tsync;

    u64         tx_packets;

    u64         tx_bytes;

    struct sk_buff_head     tq;

} ____cacheline_aligned_in_smp;

​

struct ifb_dev_private {

    struct ifb_q_private *tx_private;

};

​

static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev);

static int ifb_open(struct net_device *dev);

static int ifb_close(struct net_device *dev);

​

static void ifb_ri_tasklet(unsigned long _txp)

{