kernel-fxtec-pro1x/drivers/tty/ipwireless/network.c

509 lines
12 KiB
C
Raw Normal View History

/*
* IPWireless 3G PCMCIA Network Driver
*
* Original code
* by Stephen Blackheath <stephen@blacksapphire.com>,
* Ben Martel <benm@symmetric.co.nz>
*
* Copyrighted as follows:
* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
*
* Various driver changes and rewrites, port to new kernels
* Copyright (C) 2006-2007 Jiri Kosina
*
* Misc code cleanups and updates
* Copyright (C) 2007 David Sterba
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/ppp_channel.h>
#include <linux/ppp_defs.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
#include <linux/slab.h>
#include <linux/ppp-ioctl.h>
#include <linux/skbuff.h>
#include "network.h"
#include "hardware.h"
#include "main.h"
#include "tty.h"
#define MAX_ASSOCIATED_TTYS 2
#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
struct ipw_network {
/* Hardware context, used for calls to hardware layer. */
struct ipw_hardware *hardware;
/* Context for kernel 'generic_ppp' functionality */
struct ppp_channel *ppp_channel;
/* tty context connected with IPW console */
struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
/* True if ppp needs waking up once we're ready to xmit */
int ppp_blocked;
/* Number of packets queued up in hardware module. */
int outgoing_packets_queued;
/* Spinlock to avoid interrupts during shutdown */
spinlock_t lock;
struct mutex close_lock;
/* PPP ioctl data, not actually used anywere */
unsigned int flags;
unsigned int rbits;
u32 xaccm[8];
u32 raccm;
int mru;
int shutting_down;
unsigned int ras_control_lines;
struct work_struct work_go_online;
struct work_struct work_go_offline;
};
static void notify_packet_sent(void *callback_data, unsigned int packet_length)
{
struct ipw_network *network = callback_data;
unsigned long flags;
spin_lock_irqsave(&network->lock, flags);
network->outgoing_packets_queued--;
if (network->ppp_channel != NULL) {
if (network->ppp_blocked) {
network->ppp_blocked = 0;
spin_unlock_irqrestore(&network->lock, flags);
ppp_output_wakeup(network->ppp_channel);
if (ipwireless_debug)
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
": ppp unblocked\n");
} else
spin_unlock_irqrestore(&network->lock, flags);
} else
spin_unlock_irqrestore(&network->lock, flags);
}
/*
* Called by the ppp system when it has a packet to send to the hardware.
*/
static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
struct sk_buff *skb)
{
struct ipw_network *network = ppp_channel->private;
unsigned long flags;
spin_lock_irqsave(&network->lock, flags);
if (network->outgoing_packets_queued < ipwireless_out_queue) {
unsigned char *buf;
static unsigned char header[] = {
PPP_ALLSTATIONS, /* 0xff */
PPP_UI, /* 0x03 */
};
int ret;
network->outgoing_packets_queued++;
spin_unlock_irqrestore(&network->lock, flags);
/*
* If we have the requested amount of headroom in the skb we
* were handed, then we can add the header efficiently.
*/
if (skb_headroom(skb) >= 2) {
memcpy(skb_push(skb, 2), header, 2);
ret = ipwireless_send_packet(network->hardware,
IPW_CHANNEL_RAS, skb->data,
skb->len,
notify_packet_sent,
network);
if (ret == -1) {
skb_pull(skb, 2);
return 0;
}
} else {
/* Otherwise (rarely) we do it inefficiently. */
buf = kmalloc(skb->len + 2, GFP_ATOMIC);
if (!buf)
return 0;
memcpy(buf + 2, skb->data, skb->len);
memcpy(buf, header, 2);
ret = ipwireless_send_packet(network->hardware,
IPW_CHANNEL_RAS, buf,
skb->len + 2,
notify_packet_sent,
network);
kfree(buf);
if (ret == -1)
return 0;
}
kfree_skb(skb);
return 1;
} else {
/*
* Otherwise reject the packet, and flag that the ppp system
* needs to be unblocked once we are ready to send.
*/
network->ppp_blocked = 1;
spin_unlock_irqrestore(&network->lock, flags);
if (ipwireless_debug)
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n");
return 0;
}
}
/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
unsigned int cmd, unsigned long arg)
{
struct ipw_network *network = ppp_channel->private;
int err, val;
u32 accm[8];
int __user *user_arg = (int __user *) arg;
err = -EFAULT;
switch (cmd) {
case PPPIOCGFLAGS:
val = network->flags | network->rbits;
if (put_user(val, user_arg))
break;
err = 0;
break;
case PPPIOCSFLAGS:
if (get_user(val, user_arg))
break;
network->flags = val & ~SC_RCV_BITS;
network->rbits = val & SC_RCV_BITS;
err = 0;
break;
case PPPIOCGASYNCMAP:
if (put_user(network->xaccm[0], user_arg))
break;
err = 0;
break;
case PPPIOCSASYNCMAP:
if (get_user(network->xaccm[0], user_arg))
break;
err = 0;
break;
case PPPIOCGRASYNCMAP:
if (put_user(network->raccm, user_arg))
break;
err = 0;
break;
case PPPIOCSRASYNCMAP:
if (get_user(network->raccm, user_arg))
break;
err = 0;
break;
case PPPIOCGXASYNCMAP:
if (copy_to_user((void __user *) arg, network->xaccm,
sizeof(network->xaccm)))
break;
err = 0;
break;
case PPPIOCSXASYNCMAP:
if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
break;
accm[2] &= ~0x40000000U; /* can't escape 0x5e */
accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
memcpy(network->xaccm, accm, sizeof(network->xaccm));
err = 0;
break;
case PPPIOCGMRU:
if (put_user(network->mru, user_arg))
break;
err = 0;
break;
case PPPIOCSMRU:
if (get_user(val, user_arg))
break;
if (val < PPP_MRU)
val = PPP_MRU;
network->mru = val;
err = 0;
break;
default:
err = -ENOTTY;
}
return err;
}
static const struct ppp_channel_ops ipwireless_ppp_channel_ops = {
.start_xmit = ipwireless_ppp_start_xmit,
.ioctl = ipwireless_ppp_ioctl
};
static void do_go_online(struct work_struct *work_go_online)
{
struct ipw_network *network =
container_of(work_go_online, struct ipw_network,
work_go_online);
unsigned long flags;
spin_lock_irqsave(&network->lock, flags);
if (!network->ppp_channel) {
struct ppp_channel *channel;
spin_unlock_irqrestore(&network->lock, flags);
channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
if (!channel) {
printk(KERN_ERR IPWIRELESS_PCCARD_NAME
": unable to allocate PPP channel\n");
return;
}
channel->private = network;
channel->mtu = 16384; /* Wild guess */
channel->hdrlen = 2;
channel->ops = &ipwireless_ppp_channel_ops;
network->flags = 0;
network->rbits = 0;
network->mru = PPP_MRU;
memset(network->xaccm, 0, sizeof(network->xaccm));
network->xaccm[0] = ~0U;
network->xaccm[3] = 0x60000000U;
network->raccm = ~0U;
ppp_register_channel(channel);
spin_lock_irqsave(&network->lock, flags);
network->ppp_channel = channel;
}
spin_unlock_irqrestore(&network->lock, flags);
}
static void do_go_offline(struct work_struct *work_go_offline)
{
struct ipw_network *network =
container_of(work_go_offline, struct ipw_network,
work_go_offline);
unsigned long flags;
mutex_lock(&network->close_lock);
spin_lock_irqsave(&network->lock, flags);
if (network->ppp_channel != NULL) {
struct ppp_channel *channel = network->ppp_channel;
network->ppp_channel = NULL;
spin_unlock_irqrestore(&network->lock, flags);
mutex_unlock(&network->close_lock);
ppp_unregister_channel(channel);
} else {
spin_unlock_irqrestore(&network->lock, flags);
mutex_unlock(&network->close_lock);
}
}
void ipwireless_network_notify_control_line_change(struct ipw_network *network,
unsigned int channel_idx,
unsigned int control_lines,
unsigned int changed_mask)
{
int i;
if (channel_idx == IPW_CHANNEL_RAS)
network->ras_control_lines = control_lines;
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
struct ipw_tty *tty =
network->associated_ttys[channel_idx][i];
/*
* If it's associated with a tty (other than the RAS channel
* when we're online), then send the data to that tty. The RAS
* channel's data is handled above - it always goes through
* ppp_generic.
*/
if (tty)
ipwireless_tty_notify_control_line_change(tty,
channel_idx,
control_lines,
changed_mask);
}
}
/*
* Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
* bytes, which are required on sent packet, but not always present on received
* packets
*/
static struct sk_buff *ipw_packet_received_skb(unsigned char *data,
unsigned int length)
{
struct sk_buff *skb;
if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
length -= 2;
data += 2;
}
skb = dev_alloc_skb(length + 4);
skb_reserve(skb, 2);
memcpy(skb_put(skb, length), data, length);
return skb;
}
void ipwireless_network_packet_received(struct ipw_network *network,
unsigned int channel_idx,
unsigned char *data,
unsigned int length)
{
int i;
unsigned long flags;
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
struct ipw_tty *tty = network->associated_ttys[channel_idx][i];
if (!tty)
continue;
/*
* If it's associated with a tty (other than the RAS channel
* when we're online), then send the data to that tty. The RAS
* channel's data is handled above - it always goes through
* ppp_generic.
*/
if (channel_idx == IPW_CHANNEL_RAS
&& (network->ras_control_lines &
IPW_CONTROL_LINE_DCD) != 0
&& ipwireless_tty_is_modem(tty)) {
/*
* If data came in on the RAS channel and this tty is
* the modem tty, and we are online, then we send it to
* the PPP layer.
*/
mutex_lock(&network->close_lock);
spin_lock_irqsave(&network->lock, flags);
if (network->ppp_channel != NULL) {
struct sk_buff *skb;
spin_unlock_irqrestore(&network->lock,
flags);
/* Send the data to the ppp_generic module. */
skb = ipw_packet_received_skb(data, length);
ppp_input(network->ppp_channel, skb);
} else
spin_unlock_irqrestore(&network->lock,
flags);
mutex_unlock(&network->close_lock);
}
/* Otherwise we send it out the tty. */
else
ipwireless_tty_received(tty, data, length);
}
}
struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
{
struct ipw_network *network =
kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);
if (!network)
return NULL;
spin_lock_init(&network->lock);
mutex_init(&network->close_lock);
network->hardware = hw;
INIT_WORK(&network->work_go_online, do_go_online);
INIT_WORK(&network->work_go_offline, do_go_offline);
ipwireless_associate_network(hw, network);
return network;
}
void ipwireless_network_free(struct ipw_network *network)
{
network->shutting_down = 1;
ipwireless_ppp_close(network);
flush_work_sync(&network->work_go_online);
flush_work_sync(&network->work_go_offline);
ipwireless_stop_interrupts(network->hardware);
ipwireless_associate_network(network->hardware, NULL);
kfree(network);
}
void ipwireless_associate_network_tty(struct ipw_network *network,
unsigned int channel_idx,
struct ipw_tty *tty)
{
int i;
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
if (network->associated_ttys[channel_idx][i] == NULL) {
network->associated_ttys[channel_idx][i] = tty;
break;
}
}
void ipwireless_disassociate_network_ttys(struct ipw_network *network,
unsigned int channel_idx)
{
int i;
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
network->associated_ttys[channel_idx][i] = NULL;
}
void ipwireless_ppp_open(struct ipw_network *network)
{
if (ipwireless_debug)
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
schedule_work(&network->work_go_online);
}
void ipwireless_ppp_close(struct ipw_network *network)
{
/* Disconnect from the wireless network. */
if (ipwireless_debug)
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
schedule_work(&network->work_go_offline);
}
int ipwireless_ppp_channel_index(struct ipw_network *network)
{
int ret = -1;
unsigned long flags;
spin_lock_irqsave(&network->lock, flags);
if (network->ppp_channel != NULL)
ret = ppp_channel_index(network->ppp_channel);
spin_unlock_irqrestore(&network->lock, flags);
return ret;
}
int ipwireless_ppp_unit_number(struct ipw_network *network)
{
int ret = -1;
unsigned long flags;
spin_lock_irqsave(&network->lock, flags);
if (network->ppp_channel != NULL)
ret = ppp_unit_number(network->ppp_channel);
spin_unlock_irqrestore(&network->lock, flags);
return ret;
}
int ipwireless_ppp_mru(const struct ipw_network *network)
{
return network->mru;
}