linux/drivers/net/ipa/ipa_modem.c

// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
 * Copyright (C) 2018-2024 Linaro Ltd.
 */

#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/if_rmnet.h>
#include <linux/netdevice.h>
#include <linux/pm_runtime.h>
#include <linux/skbuff.h>
#include <net/pkt_sched.h>

#include <linux/remoteproc/qcom_rproc.h>

#include "ipa.h"
#include "ipa_endpoint.h"
#include "ipa_mem.h"
#include "ipa_modem.h"
#include "ipa_smp2p.h"
#include "ipa_table.h"
#include "ipa_uc.h"

#define IPA_NETDEV_NAME …
#define IPA_NETDEV_TAILROOM …
#define IPA_NETDEV_TIMEOUT …

enum ipa_modem_state { … };

/**
 * struct ipa_priv - IPA network device private data
 * @ipa:	IPA pointer
 * @tx:		Transmit endpoint pointer
 * @rx:		Receive endpoint pointer
 * @work:	Work structure used to wake the modem netdev TX queue
 */
struct ipa_priv { … };

/** ipa_open() - Opens the modem network interface */
static int ipa_open(struct net_device *netdev)
{ … }

/** ipa_stop() - Stops the modem network interface. */
static int ipa_stop(struct net_device *netdev)
{ … }

/** ipa_start_xmit() - Transmit an skb
 * @skb:	Socket buffer to be transmitted
 * @netdev:	Network device
 *
 * Return: NETDEV_TX_OK if successful (or dropped), NETDEV_TX_BUSY otherwise

 * Normally NETDEV_TX_OK indicates the buffer was successfully transmitted.
 * If the buffer has an unexpected protocol or its size is out of range it
 * is quietly dropped, returning NETDEV_TX_OK.  NETDEV_TX_BUSY indicates
 * the buffer cannot be sent at this time and should retried later.
 */
static netdev_tx_t
ipa_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{ … }

void ipa_modem_skb_rx(struct net_device *netdev, struct sk_buff *skb)
{ … }

static const struct net_device_ops ipa_modem_ops = …;

/** ipa_modem_netdev_setup() - netdev setup function for the modem */
static void ipa_modem_netdev_setup(struct net_device *netdev)
{ … }

/** ipa_modem_suspend() - suspend callback
 * @netdev:	Network device
 *
 * Suspend the modem's endpoints.
 */
void ipa_modem_suspend(struct net_device *netdev)
{ … }

/**
 * ipa_modem_wake_queue_work() - enable modem netdev queue
 * @work:	Work structure
 *
 * Re-enable transmit on the modem network device.  This is called
 * in (power management) work queue context, scheduled when resuming
 * the modem.  We can't enable the queue directly in ipa_modem_resume()
 * because transmits restart the instant the queue is awakened; but the
 * device power state won't be ACTIVE until *after* ipa_modem_resume()
 * returns.
 */
static void ipa_modem_wake_queue_work(struct work_struct *work)
{ … }

/** ipa_modem_resume() - resume callback for runtime_pm
 * @dev: pointer to device
 *
 * Resume the modem's endpoints.
 */
void ipa_modem_resume(struct net_device *netdev)
{ … }

int ipa_modem_start(struct ipa *ipa)
{ … }

int ipa_modem_stop(struct ipa *ipa)
{ … }

/* Treat a "clean" modem stop the same as a crash */
static void ipa_modem_crashed(struct ipa *ipa)
{ … }

static int ipa_modem_notify(struct notifier_block *nb, unsigned long action,
			    void *data)
{ … }

int ipa_modem_config(struct ipa *ipa)
{ … }

void ipa_modem_deconfig(struct ipa *ipa)
{ … }