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linux/include/net/irda/irda_device.h
Samuel Ortiz 69c30e1e74 irda: Add irda_skb_cb qdisc related padding 
We need to pad irda_skb_cb in order to keep it safe accross dev_queue_xmit()
calls. This is some ugly and temporary hack triggered by recent qisc code
changes.
Even though it fixes bugzilla.kernel.org bug #11795, it will be replaced by a
proper fix before 2.6.29 is released.

Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-17 15:44:58 -08:00

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/*********************************************************************
*
* Filename: irda_device.h
* Version: 0.9
* Description: Contains various declarations used by the drivers
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Tue Apr 14 12:41:42 1998
* Modified at: Mon Mar 20 09:08:57 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
* Copyright (c) 1998 Thomas Davis, <ratbert@radiks.net>,
* Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
********************************************************************/
/*
* This header contains all the IrDA definitions a driver really
* needs, and therefore the driver should not need to include
* any other IrDA headers - Jean II
*/
#ifndef IRDA_DEVICE_H
#define IRDA_DEVICE_H
#include <linux/tty.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h> /* struct sk_buff */
#include <linux/irda.h>
#include <linux/types.h>
#include <net/pkt_sched.h>
#include <net/irda/irda.h>
#include <net/irda/qos.h> /* struct qos_info */
#include <net/irda/irqueue.h> /* irda_queue_t */
/* A few forward declarations (to make compiler happy) */
struct irlap_cb;
/* Some non-standard interface flags (should not conflict with any in if.h) */
#define IFF_SIR 0x0001 /* Supports SIR speeds */
#define IFF_MIR 0x0002 /* Supports MIR speeds */
#define IFF_FIR 0x0004 /* Supports FIR speeds */
#define IFF_VFIR 0x0008 /* Supports VFIR speeds */
#define IFF_PIO 0x0010 /* Supports PIO transfer of data */
#define IFF_DMA 0x0020 /* Supports DMA transfer of data */
#define IFF_SHM 0x0040 /* Supports shared memory data transfers */
#define IFF_DONGLE 0x0080 /* Interface has a dongle attached */
#define IFF_AIR 0x0100 /* Supports Advanced IR (AIR) standards */
#define IO_XMIT 0x01
#define IO_RECV 0x02
typedef enum {
IRDA_IRLAP, /* IrDA mode, and deliver to IrLAP */
IRDA_RAW, /* IrDA mode */
SHARP_ASK,
TV_REMOTE, /* Also known as Consumer Electronics IR */
} INFRARED_MODE;
typedef enum {
IRDA_TASK_INIT, /* All tasks are initialized with this state */
IRDA_TASK_DONE, /* Signals that the task is finished */
IRDA_TASK_WAIT,
IRDA_TASK_WAIT1,
IRDA_TASK_WAIT2,
IRDA_TASK_WAIT3,
IRDA_TASK_CHILD_INIT, /* Initializing child task */
IRDA_TASK_CHILD_WAIT, /* Waiting for child task to finish */
IRDA_TASK_CHILD_DONE /* Child task is finished */
} IRDA_TASK_STATE;
struct irda_task;
typedef int (*IRDA_TASK_CALLBACK) (struct irda_task *task);
struct irda_task {
irda_queue_t q;
magic_t magic;
IRDA_TASK_STATE state;
IRDA_TASK_CALLBACK function;
IRDA_TASK_CALLBACK finished;
struct irda_task *parent;
struct timer_list timer;
void *instance; /* Instance being called */
void *param; /* Parameter to be used by instance */
};
/* Dongle info */
struct dongle_reg;
typedef struct {
struct dongle_reg *issue; /* Registration info */
struct net_device *dev; /* Device we are attached to */
struct irda_task *speed_task; /* Task handling speed change */
struct irda_task *reset_task; /* Task handling reset */
__u32 speed; /* Current speed */
/* Callbacks to the IrDA device driver */
int (*set_mode)(struct net_device *, int mode);
int (*read)(struct net_device *dev, __u8 *buf, int len);
int (*write)(struct net_device *dev, __u8 *buf, int len);
int (*set_dtr_rts)(struct net_device *dev, int dtr, int rts);
} dongle_t;
/* Dongle registration info */
struct dongle_reg {
irda_queue_t q; /* Must be first */
IRDA_DONGLE type;
void (*open)(dongle_t *dongle, struct qos_info *qos);
void (*close)(dongle_t *dongle);
int (*reset)(struct irda_task *task);
int (*change_speed)(struct irda_task *task);
struct module *owner;
};
/*
* Per-packet information we need to hide inside sk_buff
* (must not exceed 48 bytes, check with struct sk_buff)
* The default_qdisc_pad field is a temporary hack.
*/
struct irda_skb_cb {
unsigned int default_qdisc_pad;
magic_t magic; /* Be sure that we can trust the information */
__u32 next_speed; /* The Speed to be set *after* this frame */
__u16 mtt; /* Minimum turn around time */
__u16 xbofs; /* Number of xbofs required, used by SIR mode */
__u16 next_xbofs; /* Number of xbofs required *after* this frame */
void *context; /* May be used by drivers */
void (*destructor)(struct sk_buff *skb); /* Used for flow control */
__u16 xbofs_delay; /* Number of xbofs used for generating the mtt */
__u8 line; /* Used by IrCOMM in IrLPT mode */
};
/* Chip specific info */
typedef struct {
int cfg_base; /* Config register IO base */
int sir_base; /* SIR IO base */
int fir_base; /* FIR IO base */
int mem_base; /* Shared memory base */
int sir_ext; /* Length of SIR iobase */
int fir_ext; /* Length of FIR iobase */
int irq, irq2; /* Interrupts used */
int dma, dma2; /* DMA channel(s) used */
int fifo_size; /* FIFO size */
int irqflags; /* interrupt flags (ie, IRQF_SHARED|IRQF_DISABLED) */
int direction; /* Link direction, used by some FIR drivers */
int enabled; /* Powered on? */
int suspended; /* Suspended by APM */
__u32 speed; /* Currently used speed */
__u32 new_speed; /* Speed we must change to when Tx is finished */
int dongle_id; /* Dongle or transceiver currently used */
} chipio_t;
/* IO buffer specific info (inspired by struct sk_buff) */
typedef struct {
int state; /* Receiving state (transmit state not used) */
int in_frame; /* True if receiving frame */
__u8 *head; /* start of buffer */
__u8 *data; /* start of data in buffer */
int len; /* current length of data */
int truesize; /* total allocated size of buffer */
__u16 fcs;
struct sk_buff *skb; /* ZeroCopy Rx in async_unwrap_char() */
} iobuff_t;
/* Maximum SIR frame (skb) that we expect to receive *unwrapped*.
* Max LAP MTU (I field) is 2048 bytes max (IrLAP 1.1, chapt 6.6.5, p40).
* Max LAP header is 2 bytes (for now).
* Max CRC is 2 bytes at SIR, 4 bytes at FIR.
* Need 1 byte for skb_reserve() to align IP header for IrLAN.
* Add a few extra bytes just to be safe (buffer is power of two anyway)
* Jean II */
#define IRDA_SKB_MAX_MTU 2064
/* Maximum SIR frame that we expect to send, wrapped (i.e. with XBOFS
* and escaped characters on top of above). */
#define IRDA_SIR_MAX_FRAME 4269
/* The SIR unwrapper async_unwrap_char() will use a Rx-copy-break mechanism
* when using the optional ZeroCopy Rx, where only small frames are memcpy
* to a smaller skb to save memory. This is the threshold under which copy
* will happen (and over which it won't happen).
* Some FIR drivers may use this #define as well...
* This is the same value as various Ethernet drivers. - Jean II */
#define IRDA_RX_COPY_THRESHOLD 256
/* Function prototypes */
int irda_device_init(void);
void irda_device_cleanup(void);
/* IrLAP entry points used by the drivers.
* We declare them here to avoid the driver pulling a whole bunch stack
* headers they don't really need - Jean II */
struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
const char *hw_name);
void irlap_close(struct irlap_cb *self);
/* Interface to be uses by IrLAP */
void irda_device_set_media_busy(struct net_device *dev, int status);
int irda_device_is_media_busy(struct net_device *dev);
int irda_device_is_receiving(struct net_device *dev);
/* Interface for internal use */
static inline int irda_device_txqueue_empty(const struct net_device *dev)
{
return qdisc_all_tx_empty(dev);
}
int irda_device_set_raw_mode(struct net_device* self, int status);
struct net_device *alloc_irdadev(int sizeof_priv);
void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode);
/*
* Function irda_get_mtt (skb)
*
* Utility function for getting the minimum turnaround time out of
* the skb, where it has been hidden in the cb field.
*/
static inline __u16 irda_get_mtt(const struct sk_buff *skb)
{
const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
return (cb->magic == LAP_MAGIC) ? cb->mtt : 10000;
}
/*
* Function irda_get_next_speed (skb)
*
* Extract the speed that should be set *after* this frame from the skb
*
* Note : return -1 for user space frames
*/
static inline __u32 irda_get_next_speed(const struct sk_buff *skb)
{
const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
return (cb->magic == LAP_MAGIC) ? cb->next_speed : -1;
}
/*
* Function irda_get_next_xbofs (skb)
*
* Extract the xbofs that should be set for this frame from the skb
*
* Note : default to 10 for user space frames
*/
static inline __u16 irda_get_xbofs(const struct sk_buff *skb)
{
const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
return (cb->magic == LAP_MAGIC) ? cb->xbofs : 10;
}
/*
* Function irda_get_next_xbofs (skb)
*
* Extract the xbofs that should be set *after* this frame from the skb
*
* Note : return -1 for user space frames
*/
static inline __u16 irda_get_next_xbofs(const struct sk_buff *skb)
{
const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
return (cb->magic == LAP_MAGIC) ? cb->next_xbofs : -1;
}
#endif /* IRDA_DEVICE_H */
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