linux/drivers/net/ieee802154/fakelb.c
Alexander Aring 789a99ecb9 fakelb: add xmit_async after stop testcase
This patch adds a suspended testcase into the xmit_async functionality.
In the hope that we can found race conditions when xmit_async is called
after an ieee802154_ops stop. This should never happen.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2015-06-15 01:25:06 +02:00

261 lines
6.2 KiB
C

/*
* Loopback IEEE 802.15.4 interface
*
* Copyright 2007-2012 Siemens AG
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Written by:
* Sergey Lapin <slapin@ossfans.org>
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>
static int numlbs = 2;
static LIST_HEAD(fakelb_phys);
static DEFINE_SPINLOCK(fakelb_phys_lock);
static LIST_HEAD(fakelb_ifup_phys);
static DEFINE_RWLOCK(fakelb_ifup_phys_lock);
struct fakelb_phy {
struct ieee802154_hw *hw;
u8 page;
u8 channel;
bool suspended;
struct list_head list;
struct list_head list_ifup;
};
static int fakelb_hw_ed(struct ieee802154_hw *hw, u8 *level)
{
BUG_ON(!level);
*level = 0xbe;
return 0;
}
static int fakelb_hw_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
{
struct fakelb_phy *phy = hw->priv;
write_lock_bh(&fakelb_ifup_phys_lock);
phy->page = page;
phy->channel = channel;
write_unlock_bh(&fakelb_ifup_phys_lock);
return 0;
}
static int fakelb_hw_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
{
struct fakelb_phy *current_phy = hw->priv, *phy;
read_lock_bh(&fakelb_ifup_phys_lock);
WARN_ON(current_phy->suspended);
list_for_each_entry(phy, &fakelb_ifup_phys, list_ifup) {
if (current_phy == phy)
continue;
if (current_phy->page == phy->page &&
current_phy->channel == phy->channel) {
struct sk_buff *newskb = pskb_copy(skb, GFP_ATOMIC);
if (newskb)
ieee802154_rx_irqsafe(phy->hw, newskb, 0xcc);
}
}
read_unlock_bh(&fakelb_ifup_phys_lock);
ieee802154_xmit_complete(hw, skb, false);
return 0;
}
static int fakelb_hw_start(struct ieee802154_hw *hw)
{
struct fakelb_phy *phy = hw->priv;
write_lock_bh(&fakelb_ifup_phys_lock);
phy->suspended = false;
list_add(&phy->list_ifup, &fakelb_ifup_phys);
write_unlock_bh(&fakelb_ifup_phys_lock);
return 0;
}
static void fakelb_hw_stop(struct ieee802154_hw *hw)
{
struct fakelb_phy *phy = hw->priv;
write_lock_bh(&fakelb_ifup_phys_lock);
phy->suspended = true;
list_del(&phy->list_ifup);
write_unlock_bh(&fakelb_ifup_phys_lock);
}
static const struct ieee802154_ops fakelb_ops = {
.owner = THIS_MODULE,
.xmit_async = fakelb_hw_xmit,
.ed = fakelb_hw_ed,
.set_channel = fakelb_hw_channel,
.start = fakelb_hw_start,
.stop = fakelb_hw_stop,
};
/* Number of dummy devices to be set up by this module. */
module_param(numlbs, int, 0);
MODULE_PARM_DESC(numlbs, " number of pseudo devices");
static int fakelb_add_one(struct device *dev)
{
struct ieee802154_hw *hw;
struct fakelb_phy *phy;
int err;
hw = ieee802154_alloc_hw(sizeof(*phy), &fakelb_ops);
if (!hw)
return -ENOMEM;
phy = hw->priv;
phy->hw = hw;
/* 868 MHz BPSK 802.15.4-2003 */
hw->phy->supported.channels[0] |= 1;
/* 915 MHz BPSK 802.15.4-2003 */
hw->phy->supported.channels[0] |= 0x7fe;
/* 2.4 GHz O-QPSK 802.15.4-2003 */
hw->phy->supported.channels[0] |= 0x7FFF800;
/* 868 MHz ASK 802.15.4-2006 */
hw->phy->supported.channels[1] |= 1;
/* 915 MHz ASK 802.15.4-2006 */
hw->phy->supported.channels[1] |= 0x7fe;
/* 868 MHz O-QPSK 802.15.4-2006 */
hw->phy->supported.channels[2] |= 1;
/* 915 MHz O-QPSK 802.15.4-2006 */
hw->phy->supported.channels[2] |= 0x7fe;
/* 2.4 GHz CSS 802.15.4a-2007 */
hw->phy->supported.channels[3] |= 0x3fff;
/* UWB Sub-gigahertz 802.15.4a-2007 */
hw->phy->supported.channels[4] |= 1;
/* UWB Low band 802.15.4a-2007 */
hw->phy->supported.channels[4] |= 0x1e;
/* UWB High band 802.15.4a-2007 */
hw->phy->supported.channels[4] |= 0xffe0;
/* 750 MHz O-QPSK 802.15.4c-2009 */
hw->phy->supported.channels[5] |= 0xf;
/* 750 MHz MPSK 802.15.4c-2009 */
hw->phy->supported.channels[5] |= 0xf0;
/* 950 MHz BPSK 802.15.4d-2009 */
hw->phy->supported.channels[6] |= 0x3ff;
/* 950 MHz GFSK 802.15.4d-2009 */
hw->phy->supported.channels[6] |= 0x3ffc00;
ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
/* fake phy channel 13 as default */
hw->phy->current_channel = 13;
phy->channel = hw->phy->current_channel;
hw->parent = dev;
err = ieee802154_register_hw(hw);
if (err)
goto err_reg;
spin_lock(&fakelb_phys_lock);
list_add_tail(&phy->list, &fakelb_phys);
spin_unlock(&fakelb_phys_lock);
return 0;
err_reg:
ieee802154_free_hw(phy->hw);
return err;
}
static void fakelb_del(struct fakelb_phy *phy)
{
list_del(&phy->list);
ieee802154_unregister_hw(phy->hw);
ieee802154_free_hw(phy->hw);
}
static int fakelb_probe(struct platform_device *pdev)
{
struct fakelb_phy *phy, *tmp;
int err, i;
for (i = 0; i < numlbs; i++) {
err = fakelb_add_one(&pdev->dev);
if (err < 0)
goto err_slave;
}
dev_info(&pdev->dev, "added ieee802154 hardware\n");
return 0;
err_slave:
spin_lock(&fakelb_phys_lock);
list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
fakelb_del(phy);
spin_unlock(&fakelb_phys_lock);
return err;
}
static int fakelb_remove(struct platform_device *pdev)
{
struct fakelb_phy *phy, *tmp;
spin_lock(&fakelb_phys_lock);
list_for_each_entry_safe(phy, tmp, &fakelb_phys, list)
fakelb_del(phy);
spin_unlock(&fakelb_phys_lock);
return 0;
}
static struct platform_device *ieee802154fake_dev;
static struct platform_driver ieee802154fake_driver = {
.probe = fakelb_probe,
.remove = fakelb_remove,
.driver = {
.name = "ieee802154fakelb",
},
};
static __init int fakelb_init_module(void)
{
ieee802154fake_dev = platform_device_register_simple(
"ieee802154fakelb", -1, NULL, 0);
return platform_driver_register(&ieee802154fake_driver);
}
static __exit void fake_remove_module(void)
{
platform_driver_unregister(&ieee802154fake_driver);
platform_device_unregister(ieee802154fake_dev);
}
module_init(fakelb_init_module);
module_exit(fake_remove_module);
MODULE_LICENSE("GPL");