Revision 1902750b50757804775d56a1cfc9f827f734e755 authored by David S. Miller on 10 February 2016, 10:50:16 UTC, committed by David S. Miller on 10 February 2016, 10:50:16 UTC
David Wragg says: ==================== Set a large MTU on ovs-created tunnel devices Prior to 4.3, openvswitch tunnel vports (vxlan, gre and geneve) could transmit vxlan packets of any size, constrained only by the ability to send out the resulting packets. 4.3 introduced netdevs corresponding to tunnel vports. These netdevs have an MTU, which limits the size of a packet that can be successfully encapsulated. The default MTU values are low (1500 or less), which is awkwardly small in the context of physical networks supporting jumbo frames, and leads to a conspicuous change in behaviour for userspace. This patch series sets the MTU on openvswitch-created netdevs to be the relevant maximum (i.e. the maximum IP packet size minus any relevant overhead), effectively restoring the behaviour prior to 4.3. Where relevant, the limits on MTU values that can be directly set on the netdevs are also relaxed. Changes in v2: * Extend to all openvswitch tunnel types, i.e. gre and geneve as well * Use IP_MAX_MTU Changes in v3: * Fix block comment style ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
ac97_bus.c
/*
* Linux driver model AC97 bus interface
*
* Author: Nicolas Pitre
* Created: Jan 14, 2005
* Copyright: (C) MontaVista Software Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/string.h>
#include <sound/ac97_codec.h>
/*
* snd_ac97_check_id() - Reads and checks the vendor ID of the device
* @ac97: The AC97 device to check
* @id: The ID to compare to
* @id_mask: Mask that is applied to the device ID before comparing to @id
*
* If @id is 0 this function returns true if the read device vendor ID is
* a valid ID. If @id is non 0 this functions returns true if @id
* matches the read vendor ID. Otherwise the function returns false.
*/
static bool snd_ac97_check_id(struct snd_ac97 *ac97, unsigned int id,
unsigned int id_mask)
{
ac97->id = ac97->bus->ops->read(ac97, AC97_VENDOR_ID1) << 16;
ac97->id |= ac97->bus->ops->read(ac97, AC97_VENDOR_ID2);
if (ac97->id == 0x0 || ac97->id == 0xffffffff)
return false;
if (id != 0 && id != (ac97->id & id_mask))
return false;
return true;
}
/**
* snd_ac97_reset() - Reset AC'97 device
* @ac97: The AC'97 device to reset
* @try_warm: Try a warm reset first
* @id: Expected device vendor ID
* @id_mask: Mask that is applied to the device ID before comparing to @id
*
* This function resets the AC'97 device. If @try_warm is true the function
* first performs a warm reset. If the warm reset is successful the function
* returns 1. Otherwise or if @try_warm is false the function issues cold reset
* followed by a warm reset. If this is successful the function returns 0,
* otherwise a negative error code. If @id is 0 any valid device ID will be
* accepted, otherwise only the ID that matches @id and @id_mask is accepted.
*/
int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
unsigned int id_mask)
{
struct snd_ac97_bus_ops *ops = ac97->bus->ops;
if (try_warm && ops->warm_reset) {
ops->warm_reset(ac97);
if (snd_ac97_check_id(ac97, id, id_mask))
return 1;
}
if (ops->reset)
ops->reset(ac97);
if (ops->warm_reset)
ops->warm_reset(ac97);
if (snd_ac97_check_id(ac97, id, id_mask))
return 0;
return -ENODEV;
}
EXPORT_SYMBOL_GPL(snd_ac97_reset);
/*
* Let drivers decide whether they want to support given codec from their
* probe method. Drivers have direct access to the struct snd_ac97
* structure and may decide based on the id field amongst other things.
*/
static int ac97_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
struct bus_type ac97_bus_type = {
.name = "ac97",
.match = ac97_bus_match,
};
static int __init ac97_bus_init(void)
{
return bus_register(&ac97_bus_type);
}
subsys_initcall(ac97_bus_init);
static void __exit ac97_bus_exit(void)
{
bus_unregister(&ac97_bus_type);
}
module_exit(ac97_bus_exit);
EXPORT_SYMBOL(ac97_bus_type);
MODULE_LICENSE("GPL");
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