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linux/net/wanrouter/wanproc.c
Arjan van de Ven da7071d7e3 [PATCH] mark struct file_operations const 8 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

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/*****************************************************************************
* wanproc.c WAN Router Module. /proc filesystem interface.
*
* This module is completely hardware-independent and provides
* access to the router using Linux /proc filesystem.
*
* Author: Gideon Hack
*
* Copyright: (c) 1995-1999 Sangoma Technologies 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.
* ============================================================================
* Jun 02, 1999 Gideon Hack Updates for Linux 2.2.X kernels.
* Jun 29, 1997 Alan Cox Merged with 1.0.3 vendor code
* Jan 29, 1997 Gene Kozin v1.0.1. Implemented /proc read routines
* Jan 30, 1997 Alan Cox Hacked around for 2.1
* Dec 13, 1996 Gene Kozin Initial version (based on Sangoma's WANPIPE)
*****************************************************************************/
#include <linux/init.h> /* __initfunc et al. */
#include <linux/stddef.h> /* offsetof(), etc. */
#include <linux/errno.h> /* return codes */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/wanrouter.h> /* WAN router API definitions */
#include <linux/seq_file.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#define PROC_STATS_FORMAT "%30s: %12lu\n"
/****** Defines and Macros **************************************************/
#define PROT_DECODE(prot) ((prot == WANCONFIG_FR) ? " FR" :\
(prot == WANCONFIG_X25) ? " X25" : \
(prot == WANCONFIG_PPP) ? " PPP" : \
(prot == WANCONFIG_CHDLC) ? " CHDLC": \
(prot == WANCONFIG_MPPP) ? " MPPP" : \
" Unknown" )
/****** Function Prototypes *************************************************/
#ifdef CONFIG_PROC_FS
/* Miscellaneous */
/*
* Structures for interfacing with the /proc filesystem.
* Router creates its own directory /proc/net/router with the folowing
* entries:
* config device configuration
* status global device statistics
* <device> entry for each WAN device
*/
/*
* Generic /proc/net/router/<file> file and inode operations
*/
/*
* /proc/net/router
*/
static struct proc_dir_entry *proc_router;
/* Strings */
/*
* Interface functions
*/
/****** Proc filesystem entry points ****************************************/
/*
* Iterator
*/
static void *r_start(struct seq_file *m, loff_t *pos)
{
struct wan_device *wandev;
loff_t l = *pos;
lock_kernel();
if (!l--)
return SEQ_START_TOKEN;
for (wandev = wanrouter_router_devlist; l-- && wandev;
wandev = wandev->next)
;
return wandev;
}
static void *r_next(struct seq_file *m, void *v, loff_t *pos)
{
struct wan_device *wandev = v;
(*pos)++;
return (v == SEQ_START_TOKEN) ? wanrouter_router_devlist : wandev->next;
}
static void r_stop(struct seq_file *m, void *v)
{
unlock_kernel();
}
static int config_show(struct seq_file *m, void *v)
{
struct wan_device *p = v;
if (v == SEQ_START_TOKEN) {
seq_puts(m, "Device name | port |IRQ|DMA| mem.addr |"
"mem.size|option1|option2|option3|option4\n");
return 0;
}
if (!p->state)
return 0;
seq_printf(m, "%-15s|0x%-4X|%3u|%3u| 0x%-8lX |0x%-6X|%7u|%7u|%7u|%7u\n",
p->name, p->ioport, p->irq, p->dma, p->maddr, p->msize,
p->hw_opt[0], p->hw_opt[1], p->hw_opt[2], p->hw_opt[3]);
return 0;
}
static int status_show(struct seq_file *m, void *v)
{
struct wan_device *p = v;
if (v == SEQ_START_TOKEN) {
seq_puts(m, "Device name |protocol|station|interface|"
"clocking|baud rate| MTU |ndev|link state\n");
return 0;
}
if (!p->state)
return 0;
seq_printf(m, "%-15s|%-8s| %-7s| %-9s|%-8s|%9u|%5u|%3u |",
p->name,
PROT_DECODE(p->config_id),
p->config_id == WANCONFIG_FR ?
(p->station ? "Node" : "CPE") :
(p->config_id == WANCONFIG_X25 ?
(p->station ? "DCE" : "DTE") :
("N/A")),
p->interface ? "V.35" : "RS-232",
p->clocking ? "internal" : "external",
p->bps,
p->mtu,
p->ndev);
switch (p->state) {
case WAN_UNCONFIGURED:
seq_printf(m, "%-12s\n", "unconfigured");
break;
case WAN_DISCONNECTED:
seq_printf(m, "%-12s\n", "disconnected");
break;
case WAN_CONNECTING:
seq_printf(m, "%-12s\n", "connecting");
break;
case WAN_CONNECTED:
seq_printf(m, "%-12s\n", "connected");
break;
default:
seq_printf(m, "%-12s\n", "invalid");
break;
}
return 0;
}
static struct seq_operations config_op = {
.start = r_start,
.next = r_next,
.stop = r_stop,
.show = config_show,
};
static struct seq_operations status_op = {
.start = r_start,
.next = r_next,
.stop = r_stop,
.show = status_show,
};
static int config_open(struct inode *inode, struct file *file)
{
return seq_open(file, &config_op);
}
static int status_open(struct inode *inode, struct file *file)
{
return seq_open(file, &status_op);
}
static const struct file_operations config_fops = {
.owner = THIS_MODULE,
.open = config_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static const struct file_operations status_fops = {
.owner = THIS_MODULE,
.open = status_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int wandev_show(struct seq_file *m, void *v)
{
struct wan_device *wandev = m->private;
if (wandev->magic != ROUTER_MAGIC)
return 0;
if (!wandev->state) {
seq_puts(m, "device is not configured!\n");
return 0;
}
/* Update device statistics */
if (wandev->update) {
int err = wandev->update(wandev);
if (err == -EAGAIN) {
seq_puts(m, "Device is busy!\n");
return 0;
}
if (err) {
seq_puts(m, "Device is not configured!\n");
return 0;
}
}
seq_printf(m, PROC_STATS_FORMAT,
"total packets received", wandev->stats.rx_packets);
seq_printf(m, PROC_STATS_FORMAT,
"total packets transmitted", wandev->stats.tx_packets);
seq_printf(m, PROC_STATS_FORMAT,
"total bytes received", wandev->stats.rx_bytes);
seq_printf(m, PROC_STATS_FORMAT,
"total bytes transmitted", wandev->stats.tx_bytes);
seq_printf(m, PROC_STATS_FORMAT,
"bad packets received", wandev->stats.rx_errors);
seq_printf(m, PROC_STATS_FORMAT,
"packet transmit problems", wandev->stats.tx_errors);
seq_printf(m, PROC_STATS_FORMAT,
"received frames dropped", wandev->stats.rx_dropped);
seq_printf(m, PROC_STATS_FORMAT,
"transmit frames dropped", wandev->stats.tx_dropped);
seq_printf(m, PROC_STATS_FORMAT,
"multicast packets received", wandev->stats.multicast);
seq_printf(m, PROC_STATS_FORMAT,
"transmit collisions", wandev->stats.collisions);
seq_printf(m, PROC_STATS_FORMAT,
"receive length errors", wandev->stats.rx_length_errors);
seq_printf(m, PROC_STATS_FORMAT,
"receiver overrun errors", wandev->stats.rx_over_errors);
seq_printf(m, PROC_STATS_FORMAT,
"CRC errors", wandev->stats.rx_crc_errors);
seq_printf(m, PROC_STATS_FORMAT,
"frame format errors (aborts)", wandev->stats.rx_frame_errors);
seq_printf(m, PROC_STATS_FORMAT,
"receiver fifo overrun", wandev->stats.rx_fifo_errors);
seq_printf(m, PROC_STATS_FORMAT,
"receiver missed packet", wandev->stats.rx_missed_errors);
seq_printf(m, PROC_STATS_FORMAT,
"aborted frames transmitted", wandev->stats.tx_aborted_errors);
return 0;
}
static int wandev_open(struct inode *inode, struct file *file)
{
return single_open(file, wandev_show, PDE(inode)->data);
}
static const struct file_operations wandev_fops = {
.owner = THIS_MODULE,
.open = wandev_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.ioctl = wanrouter_ioctl,
};
/*
* Initialize router proc interface.
*/
int __init wanrouter_proc_init(void)
{
struct proc_dir_entry *p;
proc_router = proc_mkdir(ROUTER_NAME, proc_net);
if (!proc_router)
goto fail;
p = create_proc_entry("config", S_IRUGO, proc_router);
if (!p)
goto fail_config;
p->proc_fops = &config_fops;
p = create_proc_entry("status", S_IRUGO, proc_router);
if (!p)
goto fail_stat;
p->proc_fops = &status_fops;
return 0;
fail_stat:
remove_proc_entry("config", proc_router);
fail_config:
remove_proc_entry(ROUTER_NAME, proc_net);
fail:
return -ENOMEM;
}
/*
* Clean up router proc interface.
*/
void wanrouter_proc_cleanup(void)
{
remove_proc_entry("config", proc_router);
remove_proc_entry("status", proc_router);
remove_proc_entry(ROUTER_NAME, proc_net);
}
/*
* Add directory entry for WAN device.
*/
int wanrouter_proc_add(struct wan_device* wandev)
{
if (wandev->magic != ROUTER_MAGIC)
return -EINVAL;
wandev->dent = create_proc_entry(wandev->name, S_IRUGO, proc_router);
if (!wandev->dent)
return -ENOMEM;
wandev->dent->proc_fops = &wandev_fops;
wandev->dent->data = wandev;
return 0;
}
/*
* Delete directory entry for WAN device.
*/
int wanrouter_proc_delete(struct wan_device* wandev)
{
if (wandev->magic != ROUTER_MAGIC)
return -EINVAL;
remove_proc_entry(wandev->name, proc_router);
return 0;
}
#else
/*
* No /proc - output stubs
*/
int __init wanrouter_proc_init(void)
{
return 0;
}
void wanrouter_proc_cleanup(void)
{
}
int wanrouter_proc_add(struct wan_device *wandev)
{
return 0;
}
int wanrouter_proc_delete(struct wan_device *wandev)
{
return 0;
}
#endif
/*
* End
*/
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