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linux_dsm_epyc7002/drivers/s390/net/lcs.c
Linus Torvalds 2bcc673101 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 
Pull timer updates from Thomas Gleixner:
 "Yet another big pile of changes:

   - More year 2038 work from Arnd slowly reaching the point where we
     need to think about the syscalls themself.

   - A new timer function which allows to conditionally (re)arm a timer
     only when it's either not running or the new expiry time is sooner
     than the armed expiry time. This allows to use a single timer for
     multiple timeout requirements w/o caring about the first expiry
     time at the call site.

   - A new NMI safe accessor to clock real time for the printk timestamp
     work. Can be used by tracing, perf as well if required.

   - A large number of timer setup conversions from Kees which got
     collected here because either maintainers requested so or they
     simply got ignored. As Kees pointed out already there are a few
     trivial merge conflicts and some redundant commits which was
     unavoidable due to the size of this conversion effort.

   - Avoid a redundant iteration in the timer wheel softirq processing.

   - Provide a mechanism to treat RTC implementations depending on their
     hardware properties, i.e. don't inflict the write at the 0.5
     seconds boundary which originates from the PC CMOS RTC to all RTCs.
     No functional change as drivers need to be updated separately.

   - The usual small updates to core code clocksource drivers. Nothing
     really exciting"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (111 commits)
  timers: Add a function to start/reduce a timer
  pstore: Use ktime_get_real_fast_ns() instead of __getnstimeofday()
  timer: Prepare to change all DEFINE_TIMER() callbacks
  netfilter: ipvs: Convert timers to use timer_setup()
  scsi: qla2xxx: Convert timers to use timer_setup()
  block/aoe: discover_timer: Convert timers to use timer_setup()
  ide: Convert timers to use timer_setup()
  drbd: Convert timers to use timer_setup()
  mailbox: Convert timers to use timer_setup()
  crypto: Convert timers to use timer_setup()
  drivers/pcmcia: omap1: Fix error in automated timer conversion
  ARM: footbridge: Fix typo in timer conversion
  drivers/sgi-xp: Convert timers to use timer_setup()
  drivers/pcmcia: Convert timers to use timer_setup()
  drivers/memstick: Convert timers to use timer_setup()
  drivers/macintosh: Convert timers to use timer_setup()
  hwrng/xgene-rng: Convert timers to use timer_setup()
  auxdisplay: Convert timers to use timer_setup()
  sparc/led: Convert timers to use timer_setup()
  mips: ip22/32: Convert timers to use timer_setup()
  ...
2017-11-13 17:56:58 -08:00

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/*
* Linux for S/390 Lan Channel Station Network Driver
*
* Copyright IBM Corp. 1999, 2009
* Author(s): Original Code written by
* DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
* Rewritten by
* Frank Pavlic <fpavlic@de.ibm.com> and
* Martin Schwidefsky <schwidefsky@de.ibm.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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define KMSG_COMPONENT "lcs"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/module.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/fddidevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/igmp.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <net/arp.h>
#include <net/ip.h>
#include <asm/debug.h>
#include <asm/idals.h>
#include <asm/timex.h>
#include <linux/device.h>
#include <asm/ccwgroup.h>
#include "lcs.h"
#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
#error Cannot compile lcs.c without some net devices switched on.
#endif
/**
* initialization string for output
*/
static char version[] __initdata = "LCS driver";
/**
* the root device for lcs group devices
*/
static struct device *lcs_root_dev;
/**
* Some prototypes.
*/
static void lcs_tasklet(unsigned long);
static void lcs_start_kernel_thread(struct work_struct *);
static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
#ifdef CONFIG_IP_MULTICAST
static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
#endif /* CONFIG_IP_MULTICAST */
static int lcs_recovery(void *ptr);
/**
* Debug Facility Stuff
*/
static char debug_buffer[255];
static debug_info_t *lcs_dbf_setup;
static debug_info_t *lcs_dbf_trace;
/**
* LCS Debug Facility functions
*/
static void
lcs_unregister_debug_facility(void)
{
debug_unregister(lcs_dbf_setup);
debug_unregister(lcs_dbf_trace);
}
static int
lcs_register_debug_facility(void)
{
lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
pr_err("Not enough memory for debug facility.\n");
lcs_unregister_debug_facility();
return -ENOMEM;
}
debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
debug_set_level(lcs_dbf_setup, 2);
debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
debug_set_level(lcs_dbf_trace, 2);
return 0;
}
/**
* Allocate io buffers.
*/
static int
lcs_alloc_channel(struct lcs_channel *channel)
{
int cnt;
LCS_DBF_TEXT(2, setup, "ichalloc");
for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
/* alloc memory fo iobuffer */
channel->iob[cnt].data =
kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
if (channel->iob[cnt].data == NULL)
break;
channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
}
if (cnt < LCS_NUM_BUFFS) {
/* Not all io buffers could be allocated. */
LCS_DBF_TEXT(2, setup, "echalloc");
while (cnt-- > 0)
kfree(channel->iob[cnt].data);
return -ENOMEM;
}
return 0;
}
/**
* Free io buffers.
*/
static void
lcs_free_channel(struct lcs_channel *channel)
{
int cnt;
LCS_DBF_TEXT(2, setup, "ichfree");
for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
kfree(channel->iob[cnt].data);
channel->iob[cnt].data = NULL;
}
}
/*
* Cleanup channel.
*/
static void
lcs_cleanup_channel(struct lcs_channel *channel)
{
LCS_DBF_TEXT(3, setup, "cleanch");
/* Kill write channel tasklets. */
tasklet_kill(&channel->irq_tasklet);
/* Free channel buffers. */
lcs_free_channel(channel);
}
/**
* LCS free memory for card and channels.
*/
static void
lcs_free_card(struct lcs_card *card)
{
LCS_DBF_TEXT(2, setup, "remcard");
LCS_DBF_HEX(2, setup, &card, sizeof(void*));
kfree(card);
}
/**
* LCS alloc memory for card and channels
*/
static struct lcs_card *
lcs_alloc_card(void)
{
struct lcs_card *card;
int rc;
LCS_DBF_TEXT(2, setup, "alloclcs");
card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
if (card == NULL)
return NULL;
card->lan_type = LCS_FRAME_TYPE_AUTO;
card->pkt_seq = 0;
card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
/* Allocate io buffers for the read channel. */
rc = lcs_alloc_channel(&card->read);
if (rc){
LCS_DBF_TEXT(2, setup, "iccwerr");
lcs_free_card(card);
return NULL;
}
/* Allocate io buffers for the write channel. */
rc = lcs_alloc_channel(&card->write);
if (rc) {
LCS_DBF_TEXT(2, setup, "iccwerr");
lcs_cleanup_channel(&card->read);
lcs_free_card(card);
return NULL;
}
#ifdef CONFIG_IP_MULTICAST
INIT_LIST_HEAD(&card->ipm_list);
#endif
LCS_DBF_HEX(2, setup, &card, sizeof(void*));
return card;
}
/*
* Setup read channel.
*/
static void
lcs_setup_read_ccws(struct lcs_card *card)
{
int cnt;
LCS_DBF_TEXT(2, setup, "ireadccw");
/* Setup read ccws. */
memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
card->read.ccws[cnt].flags =
CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
/*
* Note: we have allocated the buffer with GFP_DMA, so
* we do not need to do set_normalized_cda.
*/
card->read.ccws[cnt].cda =
(__u32) __pa(card->read.iob[cnt].data);
((struct lcs_header *)
card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
card->read.iob[cnt].callback = lcs_get_frames_cb;
card->read.iob[cnt].state = LCS_BUF_STATE_READY;
card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
}
card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
/* Last ccw is a tic (transfer in channel). */
card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
card->read.ccws[LCS_NUM_BUFFS].cda =
(__u32) __pa(card->read.ccws);
/* Setg initial state of the read channel. */
card->read.state = LCS_CH_STATE_INIT;
card->read.io_idx = 0;
card->read.buf_idx = 0;
}
static void
lcs_setup_read(struct lcs_card *card)
{
LCS_DBF_TEXT(3, setup, "initread");
lcs_setup_read_ccws(card);
/* Initialize read channel tasklet. */
card->read.irq_tasklet.data = (unsigned long) &card->read;
card->read.irq_tasklet.func = lcs_tasklet;
/* Initialize waitqueue. */
init_waitqueue_head(&card->read.wait_q);
}
/*
* Setup write channel.
*/
static void
lcs_setup_write_ccws(struct lcs_card *card)
{
int cnt;
LCS_DBF_TEXT(3, setup, "iwritccw");
/* Setup write ccws. */
memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
card->write.ccws[cnt].count = 0;
card->write.ccws[cnt].flags =
CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
/*
* Note: we have allocated the buffer with GFP_DMA, so
* we do not need to do set_normalized_cda.
*/
card->write.ccws[cnt].cda =
(__u32) __pa(card->write.iob[cnt].data);
}
/* Last ccw is a tic (transfer in channel). */
card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
card->write.ccws[LCS_NUM_BUFFS].cda =
(__u32) __pa(card->write.ccws);
/* Set initial state of the write channel. */
card->read.state = LCS_CH_STATE_INIT;
card->write.io_idx = 0;
card->write.buf_idx = 0;
}
static void
lcs_setup_write(struct lcs_card *card)
{
LCS_DBF_TEXT(3, setup, "initwrit");
lcs_setup_write_ccws(card);
/* Initialize write channel tasklet. */
card->write.irq_tasklet.data = (unsigned long) &card->write;
card->write.irq_tasklet.func = lcs_tasklet;
/* Initialize waitqueue. */
init_waitqueue_head(&card->write.wait_q);
}
static void
lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
{
unsigned long flags;
spin_lock_irqsave(&card->mask_lock, flags);
card->thread_allowed_mask = threads;
spin_unlock_irqrestore(&card->mask_lock, flags);
wake_up(&card->wait_q);
}
static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
{
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&card->mask_lock, flags);
rc = (card->thread_running_mask & threads);
spin_unlock_irqrestore(&card->mask_lock, flags);
return rc;
}
static int
lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
{
return wait_event_interruptible(card->wait_q,
lcs_threads_running(card, threads) == 0);
}
static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
{
unsigned long flags;
spin_lock_irqsave(&card->mask_lock, flags);
if ( !(card->thread_allowed_mask & thread) ||
(card->thread_start_mask & thread) ) {
spin_unlock_irqrestore(&card->mask_lock, flags);
return -EPERM;
}
card->thread_start_mask |= thread;
spin_unlock_irqrestore(&card->mask_lock, flags);
return 0;
}
static void
lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
{
unsigned long flags;
spin_lock_irqsave(&card->mask_lock, flags);
card->thread_running_mask &= ~thread;
spin_unlock_irqrestore(&card->mask_lock, flags);
wake_up(&card->wait_q);
}
static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
{
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&card->mask_lock, flags);
if (card->thread_start_mask & thread){
if ((card->thread_allowed_mask & thread) &&
!(card->thread_running_mask & thread)){
rc = 1;
card->thread_start_mask &= ~thread;
card->thread_running_mask |= thread;
} else
rc = -EPERM;
}
spin_unlock_irqrestore(&card->mask_lock, flags);
return rc;
}
static int
lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
{
int rc = 0;
wait_event(card->wait_q,
(rc = __lcs_do_run_thread(card, thread)) >= 0);
return rc;
}
static int
lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
{
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&card->mask_lock, flags);
LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
(u8) card->thread_start_mask,
(u8) card->thread_allowed_mask,
(u8) card->thread_running_mask);
rc = (card->thread_start_mask & thread);
spin_unlock_irqrestore(&card->mask_lock, flags);
return rc;
}
/**
* Initialize channels,card and state machines.
*/
static void
lcs_setup_card(struct lcs_card *card)
{
LCS_DBF_TEXT(2, setup, "initcard");
LCS_DBF_HEX(2, setup, &card, sizeof(void*));
lcs_setup_read(card);
lcs_setup_write(card);
/* Set cards initial state. */
card->state = DEV_STATE_DOWN;
card->tx_buffer = NULL;
card->tx_emitted = 0;
init_waitqueue_head(&card->wait_q);
spin_lock_init(&card->lock);
spin_lock_init(&card->ipm_lock);
spin_lock_init(&card->mask_lock);
#ifdef CONFIG_IP_MULTICAST
INIT_LIST_HEAD(&card->ipm_list);
#endif
INIT_LIST_HEAD(&card->lancmd_waiters);
}
static void lcs_clear_multicast_list(struct lcs_card *card)
{
#ifdef CONFIG_IP_MULTICAST
struct lcs_ipm_list *ipm;
unsigned long flags;
/* Free multicast list. */
LCS_DBF_TEXT(3, setup, "clmclist");
spin_lock_irqsave(&card->ipm_lock, flags);
while (!list_empty(&card->ipm_list)){
ipm = list_entry(card->ipm_list.next,
struct lcs_ipm_list, list);
list_del(&ipm->list);
if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
spin_unlock_irqrestore(&card->ipm_lock, flags);
lcs_send_delipm(card, ipm);
spin_lock_irqsave(&card->ipm_lock, flags);
}
kfree(ipm);
}
spin_unlock_irqrestore(&card->ipm_lock, flags);
#endif
}
/**
* Cleanup channels,card and state machines.
*/
static void
lcs_cleanup_card(struct lcs_card *card)
{
LCS_DBF_TEXT(3, setup, "cleancrd");
LCS_DBF_HEX(2,setup,&card,sizeof(void*));
if (card->dev != NULL)
free_netdev(card->dev);
/* Cleanup channels. */
lcs_cleanup_channel(&card->write);
lcs_cleanup_channel(&card->read);
}
/**
* Start channel.
*/
static int
lcs_start_channel(struct lcs_channel *channel)
{
unsigned long flags;
int rc;
LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
rc = ccw_device_start(channel->ccwdev,
channel->ccws + channel->io_idx, 0, 0,
DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
if (rc == 0)
channel->state = LCS_CH_STATE_RUNNING;
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
if (rc) {
LCS_DBF_TEXT_(4,trace,"essh%s",
dev_name(&channel->ccwdev->dev));
dev_err(&channel->ccwdev->dev,
"Starting an LCS device resulted in an error,"
" rc=%d!\n", rc);
}
return rc;
}
static int
lcs_clear_channel(struct lcs_channel *channel)
{
unsigned long flags;
int rc;
LCS_DBF_TEXT(4,trace,"clearch");
LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
if (rc) {
LCS_DBF_TEXT_(4, trace, "ecsc%s",
dev_name(&channel->ccwdev->dev));
return rc;
}
wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
channel->state = LCS_CH_STATE_STOPPED;
return rc;
}
/**
* Stop channel.
*/
static int
lcs_stop_channel(struct lcs_channel *channel)
{
unsigned long flags;
int rc;
if (channel->state == LCS_CH_STATE_STOPPED)
return 0;
LCS_DBF_TEXT(4,trace,"haltsch");
LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
channel->state = LCS_CH_STATE_INIT;
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
if (rc) {
LCS_DBF_TEXT_(4, trace, "ehsc%s",
dev_name(&channel->ccwdev->dev));
return rc;
}
/* Asynchronous halt initialted. Wait for its completion. */
wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
lcs_clear_channel(channel);
return 0;
}
/**
* start read and write channel
*/
static int
lcs_start_channels(struct lcs_card *card)
{
int rc;
LCS_DBF_TEXT(2, trace, "chstart");
/* start read channel */
rc = lcs_start_channel(&card->read);
if (rc)
return rc;
/* start write channel */
rc = lcs_start_channel(&card->write);
if (rc)
lcs_stop_channel(&card->read);
return rc;
}
/**
* stop read and write channel
*/
static int
lcs_stop_channels(struct lcs_card *card)
{
LCS_DBF_TEXT(2, trace, "chhalt");
lcs_stop_channel(&card->read);
lcs_stop_channel(&card->write);
return 0;
}
/**
* Get empty buffer.
*/
static struct lcs_buffer *
__lcs_get_buffer(struct lcs_channel *channel)
{
int index;
LCS_DBF_TEXT(5, trace, "_getbuff");
index = channel->io_idx;
do {
if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
channel->iob[index].state = LCS_BUF_STATE_LOCKED;
return channel->iob + index;
}
index = (index + 1) & (LCS_NUM_BUFFS - 1);
} while (index != channel->io_idx);
return NULL;
}
static struct lcs_buffer *
lcs_get_buffer(struct lcs_channel *channel)
{
struct lcs_buffer *buffer;
unsigned long flags;
LCS_DBF_TEXT(5, trace, "getbuff");
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
buffer = __lcs_get_buffer(channel);
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
return buffer;
}
/**
* Resume channel program if the channel is suspended.
*/
static int
__lcs_resume_channel(struct lcs_channel *channel)
{
int rc;
if (channel->state != LCS_CH_STATE_SUSPENDED)
return 0;
if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
return 0;
LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
rc = ccw_device_resume(channel->ccwdev);
if (rc) {
LCS_DBF_TEXT_(4, trace, "ersc%s",
dev_name(&channel->ccwdev->dev));
dev_err(&channel->ccwdev->dev,
"Sending data from the LCS device to the LAN failed"
" with rc=%d\n",rc);
} else
channel->state = LCS_CH_STATE_RUNNING;
return rc;
}
/**
* Make a buffer ready for processing.
*/
static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
{
int prev, next;
LCS_DBF_TEXT(5, trace, "rdybits");
prev = (index - 1) & (LCS_NUM_BUFFS - 1);
next = (index + 1) & (LCS_NUM_BUFFS - 1);
/* Check if we may clear the suspend bit of this buffer. */
if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
/* Check if we have to set the PCI bit. */
if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
/* Suspend bit of the previous buffer is not set. */
channel->ccws[index].flags |= CCW_FLAG_PCI;
/* Suspend bit of the next buffer is set. */
channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
}
}
static int
lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
unsigned long flags;
int index, rc;
LCS_DBF_TEXT(5, trace, "rdybuff");
BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
buffer->state != LCS_BUF_STATE_PROCESSED);
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
buffer->state = LCS_BUF_STATE_READY;
index = buffer - channel->iob;
/* Set length. */
channel->ccws[index].count = buffer->count;
/* Check relevant PCI/suspend bits. */
__lcs_ready_buffer_bits(channel, index);
rc = __lcs_resume_channel(channel);
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
return rc;
}
/**
* Mark the buffer as processed. Take care of the suspend bit
* of the previous buffer. This function is called from
* interrupt context, so the lock must not be taken.
*/
static int
__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
int index, prev, next;
LCS_DBF_TEXT(5, trace, "prcsbuff");
BUG_ON(buffer->state != LCS_BUF_STATE_READY);
buffer->state = LCS_BUF_STATE_PROCESSED;
index = buffer - channel->iob;
prev = (index - 1) & (LCS_NUM_BUFFS - 1);
next = (index + 1) & (LCS_NUM_BUFFS - 1);
/* Set the suspend bit and clear the PCI bit of this buffer. */
channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
channel->ccws[index].flags &= ~CCW_FLAG_PCI;
/* Check the suspend bit of the previous buffer. */
if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
/*
* Previous buffer is in state ready. It might have
* happened in lcs_ready_buffer that the suspend bit
* has not been cleared to avoid an endless loop.
* Do it now.
*/
__lcs_ready_buffer_bits(channel, prev);
}
/* Clear PCI bit of next buffer. */
channel->ccws[next].flags &= ~CCW_FLAG_PCI;
return __lcs_resume_channel(channel);
}
/**
* Put a processed buffer back to state empty.
*/
static void
lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
unsigned long flags;
LCS_DBF_TEXT(5, trace, "relbuff");
BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
buffer->state != LCS_BUF_STATE_PROCESSED);
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
buffer->state = LCS_BUF_STATE_EMPTY;
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
}
/**
* Get buffer for a lan command.
*/
static struct lcs_buffer *
lcs_get_lancmd(struct lcs_card *card, int count)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(4, trace, "getlncmd");
/* Get buffer and wait if none is available. */
wait_event(card->write.wait_q,
((buffer = lcs_get_buffer(&card->write)) != NULL));
count += sizeof(struct lcs_header);
*(__u16 *)(buffer->data + count) = 0;
buffer->count = count + sizeof(__u16);
buffer->callback = lcs_release_buffer;
cmd = (struct lcs_cmd *) buffer->data;
cmd->offset = count;
cmd->type = LCS_FRAME_TYPE_CONTROL;
cmd->slot = 0;
return buffer;
}
static void
lcs_get_reply(struct lcs_reply *reply)
{
WARN_ON(atomic_read(&reply->refcnt) <= 0);
atomic_inc(&reply->refcnt);
}
static void
lcs_put_reply(struct lcs_reply *reply)
{
WARN_ON(atomic_read(&reply->refcnt) <= 0);
if (atomic_dec_and_test(&reply->refcnt)) {
kfree(reply);
}
}
static struct lcs_reply *
lcs_alloc_reply(struct lcs_cmd *cmd)
{
struct lcs_reply *reply;
LCS_DBF_TEXT(4, trace, "getreply");
reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
if (!reply)
return NULL;
atomic_set(&reply->refcnt,1);
reply->sequence_no = cmd->sequence_no;
reply->received = 0;
reply->rc = 0;
init_waitqueue_head(&reply->wait_q);
return reply;
}
/**
* Notifier function for lancmd replies. Called from read irq.
*/
static void
lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
{
struct list_head *l, *n;
struct lcs_reply *reply;
LCS_DBF_TEXT(4, trace, "notiwait");
spin_lock(&card->lock);
list_for_each_safe(l, n, &card->lancmd_waiters) {
reply = list_entry(l, struct lcs_reply, list);
if (reply->sequence_no == cmd->sequence_no) {
lcs_get_reply(reply);
list_del_init(&reply->list);
if (reply->callback != NULL)
reply->callback(card, cmd);
reply->received = 1;
reply->rc = cmd->return_code;
wake_up(&reply->wait_q);
lcs_put_reply(reply);
break;
}
}
spin_unlock(&card->lock);
}
/**
* Emit buffer of a lan command.
*/
static void
lcs_lancmd_timeout(struct timer_list *t)
{
struct lcs_reply *reply = from_timer(reply, t, timer);
struct lcs_reply *list_reply, *r;
unsigned long flags;
LCS_DBF_TEXT(4, trace, "timeout");
spin_lock_irqsave(&reply->card->lock, flags);
list_for_each_entry_safe(list_reply, r,
&reply->card->lancmd_waiters,list) {
if (reply == list_reply) {
lcs_get_reply(reply);
list_del_init(&reply->list);
spin_unlock_irqrestore(&reply->card->lock, flags);
reply->received = 1;
reply->rc = -ETIME;
wake_up(&reply->wait_q);
lcs_put_reply(reply);
return;
}
}
spin_unlock_irqrestore(&reply->card->lock, flags);
}
static int
lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
{
struct lcs_reply *reply;
struct lcs_cmd *cmd;
unsigned long flags;
int rc;
LCS_DBF_TEXT(4, trace, "sendcmd");
cmd = (struct lcs_cmd *) buffer->data;
cmd->return_code = 0;
cmd->sequence_no = card->sequence_no++;
reply = lcs_alloc_reply(cmd);
if (!reply)
return -ENOMEM;
reply->callback = reply_callback;
reply->card = card;
spin_lock_irqsave(&card->lock, flags);
list_add_tail(&reply->list, &card->lancmd_waiters);
spin_unlock_irqrestore(&card->lock, flags);
buffer->callback = lcs_release_buffer;
rc = lcs_ready_buffer(&card->write, buffer);
if (rc)
return rc;
timer_setup(&reply->timer, lcs_lancmd_timeout, 0);
mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout);
wait_event(reply->wait_q, reply->received);
del_timer_sync(&reply->timer);
LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
rc = reply->rc;
lcs_put_reply(reply);
return rc ? -EIO : 0;
}
/**
* LCS startup command
*/
static int
lcs_send_startup(struct lcs_card *card, __u8 initiator)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2, trace, "startup");
buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_STARTUP;
cmd->initiator = initiator;
cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
return lcs_send_lancmd(card, buffer, NULL);
}
/**
* LCS shutdown command
*/
static int
lcs_send_shutdown(struct lcs_card *card)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2, trace, "shutdown");
buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_SHUTDOWN;
cmd->initiator = LCS_INITIATOR_TCPIP;
return lcs_send_lancmd(card, buffer, NULL);
}
/**
* LCS lanstat command
*/
static void
__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
{
LCS_DBF_TEXT(2, trace, "statcb");
memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
}
static int
lcs_send_lanstat(struct lcs_card *card)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2,trace, "cmdstat");
buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
/* Setup lanstat command. */
cmd->cmd_code = LCS_CMD_LANSTAT;
cmd->initiator = LCS_INITIATOR_TCPIP;
cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
cmd->cmd.lcs_std_cmd.portno = card->portno;
return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
}
/**
* send stoplan command
*/
static int
lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2, trace, "cmdstpln");
buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_STOPLAN;
cmd->initiator = initiator;
cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
cmd->cmd.lcs_std_cmd.portno = card->portno;
return lcs_send_lancmd(card, buffer, NULL);
}
/**
* send startlan command
*/
static void
__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
{
LCS_DBF_TEXT(2, trace, "srtlancb");
card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
card->portno = cmd->cmd.lcs_std_cmd.portno;
}
static int
lcs_send_startlan(struct lcs_card *card, __u8 initiator)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2, trace, "cmdstaln");
buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_STARTLAN;
cmd->initiator = initiator;
cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
cmd->cmd.lcs_std_cmd.portno = card->portno;
return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
}
#ifdef CONFIG_IP_MULTICAST
/**
* send setipm command (Multicast)
*/
static int
lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2, trace, "cmdsetim");
buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_SETIPM;
cmd->initiator = LCS_INITIATOR_TCPIP;
cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
cmd->cmd.lcs_qipassist.portno = card->portno;
cmd->cmd.lcs_qipassist.version = 4;
cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
&ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
return lcs_send_lancmd(card, buffer, NULL);
}
/**
* send delipm command (Multicast)
*/
static int
lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
LCS_DBF_TEXT(2, trace, "cmddelim");
buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_DELIPM;
cmd->initiator = LCS_INITIATOR_TCPIP;
cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
cmd->cmd.lcs_qipassist.portno = card->portno;
cmd->cmd.lcs_qipassist.version = 4;
cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
&ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
return lcs_send_lancmd(card, buffer, NULL);
}
/**
* check if multicast is supported by LCS
*/
static void
__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
{
LCS_DBF_TEXT(2, trace, "chkmccb");
card->ip_assists_supported =
cmd->cmd.lcs_qipassist.ip_assists_supported;
card->ip_assists_enabled =
cmd->cmd.lcs_qipassist.ip_assists_enabled;
}
static int
lcs_check_multicast_support(struct lcs_card *card)
{
struct lcs_buffer *buffer;
struct lcs_cmd *cmd;
int rc;
LCS_DBF_TEXT(2, trace, "cmdqipa");
/* Send query ipassist. */
buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
cmd = (struct lcs_cmd *) buffer->data;
cmd->cmd_code = LCS_CMD_QIPASSIST;
cmd->initiator = LCS_INITIATOR_TCPIP;
cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
cmd->cmd.lcs_qipassist.portno = card->portno;
cmd->cmd.lcs_qipassist.version = 4;
cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
if (rc != 0) {
pr_err("Query IPAssist failed. Assuming unsupported!\n");
return -EOPNOTSUPP;
}
if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
return 0;
return -EOPNOTSUPP;
}
/**
* set or del multicast address on LCS card
*/
static void
lcs_fix_multicast_list(struct lcs_card *card)
{
struct list_head failed_list;
struct lcs_ipm_list *ipm, *tmp;
unsigned long flags;
int rc;
LCS_DBF_TEXT(4,trace, "fixipm");
INIT_LIST_HEAD(&failed_list);
spin_lock_irqsave(&card->ipm_lock, flags);
list_modified:
list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
switch (ipm->ipm_state) {
case LCS_IPM_STATE_SET_REQUIRED:
/* del from ipm_list so no one else can tamper with
* this entry */
list_del_init(&ipm->list);
spin_unlock_irqrestore(&card->ipm_lock, flags);
rc = lcs_send_setipm(card, ipm);
spin_lock_irqsave(&card->ipm_lock, flags);
if (rc) {
pr_info("Adding multicast address failed."
" Table possibly full!\n");
/* store ipm in failed list -> will be added
* to ipm_list again, so a retry will be done
* during the next call of this function */
list_add_tail(&ipm->list, &failed_list);
} else {
ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
/* re-insert into ipm_list */
list_add_tail(&ipm->list, &card->ipm_list);
}
goto list_modified;
case LCS_IPM_STATE_DEL_REQUIRED:
list_del(&ipm->list);
spin_unlock_irqrestore(&card->ipm_lock, flags);
lcs_send_delipm(card, ipm);
spin_lock_irqsave(&card->ipm_lock, flags);
kfree(ipm);
goto list_modified;
case LCS_IPM_STATE_ON_CARD:
break;
}
}
/* re-insert all entries from the failed_list into ipm_list */
list_for_each_entry_safe(ipm, tmp, &failed_list, list)
list_move_tail(&ipm->list, &card->ipm_list);
spin_unlock_irqrestore(&card->ipm_lock, flags);
}
/**
* get mac address for the relevant Multicast address
*/
static void
lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
{
LCS_DBF_TEXT(4,trace, "getmac");
ip_eth_mc_map(ipm, mac);
}
/**
* function called by net device to handle multicast address relevant things
*/
static void lcs_remove_mc_addresses(struct lcs_card *card,
struct in_device *in4_dev)
{
struct ip_mc_list *im4;
struct list_head *l;
struct lcs_ipm_list *ipm;
unsigned long flags;
char buf[MAX_ADDR_LEN];
LCS_DBF_TEXT(4, trace, "remmclst");
spin_lock_irqsave(&card->ipm_lock, flags);
list_for_each(l, &card->ipm_list) {
ipm = list_entry(l, struct lcs_ipm_list, list);
for (im4 = rcu_dereference(in4_dev->mc_list);
im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
(memcmp(buf, &ipm->ipm.mac_addr,
LCS_MAC_LENGTH) == 0) )
break;
}
if (im4 == NULL)
ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
}
spin_unlock_irqrestore(&card->ipm_lock, flags);
}
static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
struct ip_mc_list *im4,
char *buf)
{
struct lcs_ipm_list *tmp, *ipm = NULL;
struct list_head *l;
unsigned long flags;
LCS_DBF_TEXT(4, trace, "chkmcent");
spin_lock_irqsave(&card->ipm_lock, flags);
list_for_each(l, &card->ipm_list) {
tmp = list_entry(l, struct lcs_ipm_list, list);
if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
(memcmp(buf, &tmp->ipm.mac_addr,
LCS_MAC_LENGTH) == 0) ) {
ipm = tmp;
break;
}
}
spin_unlock_irqrestore(&card->ipm_lock, flags);
return ipm;
}
static void lcs_set_mc_addresses(struct lcs_card *card,
struct in_device *in4_dev)
{
struct ip_mc_list *im4;
struct lcs_ipm_list *ipm;
char buf[MAX_ADDR_LEN];
unsigned long flags;
LCS_DBF_TEXT(4, trace, "setmclst");
for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
im4 = rcu_dereference(im4->next_rcu)) {
lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
ipm = lcs_check_addr_entry(card, im4, buf);
if (ipm != NULL)
continue; /* Address already in list. */
ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
if (ipm == NULL) {
pr_info("Not enough memory to add"
" new multicast entry!\n");
break;
}
memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
ipm->ipm.ip_addr = im4->multiaddr;
ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
spin_lock_irqsave(&card->ipm_lock, flags);
LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
list_add(&ipm->list, &card->ipm_list);
spin_unlock_irqrestore(&card->ipm_lock, flags);
}
}
static int
lcs_register_mc_addresses(void *data)
{
struct lcs_card *card;
struct in_device *in4_dev;
card = (struct lcs_card *) data;
if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
return 0;
LCS_DBF_TEXT(4, trace, "regmulti");
in4_dev = in_dev_get(card->dev);
if (in4_dev == NULL)
goto out;
rcu_read_lock();
lcs_remove_mc_addresses(card,in4_dev);
lcs_set_mc_addresses(card, in4_dev);
rcu_read_unlock();
in_dev_put(in4_dev);
netif_carrier_off(card->dev);
netif_tx_disable(card->dev);
wait_event(card->write.wait_q,
(card->write.state != LCS_CH_STATE_RUNNING));
lcs_fix_multicast_list(card);
if (card->state == DEV_STATE_UP) {
netif_carrier_on(card->dev);
netif_wake_queue(card->dev);
}
out:
lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
return 0;
}
#endif /* CONFIG_IP_MULTICAST */
/**
* function called by net device to
* handle multicast address relevant things
*/
static void
lcs_set_multicast_list(struct net_device *dev)
{
#ifdef CONFIG_IP_MULTICAST
struct lcs_card *card;
LCS_DBF_TEXT(4, trace, "setmulti");
card = (struct lcs_card *) dev->ml_priv;
if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
schedule_work(&card->kernel_thread_starter);
#endif /* CONFIG_IP_MULTICAST */
}
static long
lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
{
if (!IS_ERR(irb))
return 0;
switch (PTR_ERR(irb)) {
case -EIO:
dev_warn(&cdev->dev,
"An I/O-error occurred on the LCS device\n");
LCS_DBF_TEXT(2, trace, "ckirberr");
LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
break;
case -ETIMEDOUT:
dev_warn(&cdev->dev,
"A command timed out on the LCS device\n");
LCS_DBF_TEXT(2, trace, "ckirberr");
LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
break;
default:
dev_warn(&cdev->dev,
"An error occurred on the LCS device, rc=%ld\n",
PTR_ERR(irb));
LCS_DBF_TEXT(2, trace, "ckirberr");
LCS_DBF_TEXT(2, trace, " rc???");
}
return PTR_ERR(irb);
}
static int
lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
{
int dstat, cstat;
char *sense;
sense = (char *) irb->ecw;
cstat = irb->scsw.cmd.cstat;
dstat = irb->scsw.cmd.dstat;
if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
LCS_DBF_TEXT(2, trace, "CGENCHK");
return 1;
}
if (dstat & DEV_STAT_UNIT_CHECK) {
if (sense[LCS_SENSE_BYTE_1] &
LCS_SENSE_RESETTING_EVENT) {
LCS_DBF_TEXT(2, trace, "REVIND");
return 1;
}
if (sense[LCS_SENSE_BYTE_0] &
LCS_SENSE_CMD_REJECT) {
LCS_DBF_TEXT(2, trace, "CMDREJ");
return 0;
}
if ((!sense[LCS_SENSE_BYTE_0]) &&
(!sense[LCS_SENSE_BYTE_1]) &&
(!sense[LCS_SENSE_BYTE_2]) &&
(!sense[LCS_SENSE_BYTE_3])) {
LCS_DBF_TEXT(2, trace, "ZEROSEN");
return 0;
}
LCS_DBF_TEXT(2, trace, "DGENCHK");
return 1;
}
return 0;
}
static void
lcs_schedule_recovery(struct lcs_card *card)
{
LCS_DBF_TEXT(2, trace, "startrec");
if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
schedule_work(&card->kernel_thread_starter);
}
/**
* IRQ Handler for LCS channels
*/
static void
lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
{
struct lcs_card *card;
struct lcs_channel *channel;
int rc, index;
int cstat, dstat;
if (lcs_check_irb_error(cdev, irb))
return;
card = CARD_FROM_DEV(cdev);
if (card->read.ccwdev == cdev)
channel = &card->read;
else
channel = &card->write;
cstat = irb->scsw.cmd.cstat;
dstat = irb->scsw.cmd.dstat;
LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
irb->scsw.cmd.dstat);
LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
irb->scsw.cmd.actl);
/* Check for channel and device errors presented */
rc = lcs_get_problem(cdev, irb);
if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
dev_warn(&cdev->dev,
"The LCS device stopped because of an error,"
" dstat=0x%X, cstat=0x%X \n",
dstat, cstat);
if (rc) {
channel->state = LCS_CH_STATE_ERROR;
}
}
if (channel->state == LCS_CH_STATE_ERROR) {
lcs_schedule_recovery(card);
wake_up(&card->wait_q);
return;
}
/* How far in the ccw chain have we processed? */
if ((channel->state != LCS_CH_STATE_INIT) &&
(irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
(irb->scsw.cmd.cpa != 0)) {
index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
- channel->ccws;
if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
(irb->scsw.cmd.cstat & SCHN_STAT_PCI))
/* Bloody io subsystem tells us lies about cpa... */
index = (index - 1) & (LCS_NUM_BUFFS - 1);
while (channel->io_idx != index) {
__lcs_processed_buffer(channel,
channel->iob + channel->io_idx);
channel->io_idx =
(channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
}
}
if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
(irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
/* Mark channel as stopped. */
channel->state = LCS_CH_STATE_STOPPED;
else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
/* CCW execution stopped on a suspend bit. */
channel->state = LCS_CH_STATE_SUSPENDED;
if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
if (irb->scsw.cmd.cc != 0) {
ccw_device_halt(channel->ccwdev, (addr_t) channel);
return;
}
/* The channel has been stopped by halt_IO. */
channel->state = LCS_CH_STATE_HALTED;
}
if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
channel->state = LCS_CH_STATE_CLEARED;
/* Do the rest in the tasklet. */
tasklet_schedule(&channel->irq_tasklet);
}
/**
* Tasklet for IRQ handler
*/
static void
lcs_tasklet(unsigned long data)
{
unsigned long flags;
struct lcs_channel *channel;
struct lcs_buffer *iob;
int buf_idx;
channel = (struct lcs_channel *) data;
LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
/* Check for processed buffers. */
iob = channel->iob;
buf_idx = channel->buf_idx;
while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
/* Do the callback thing. */
if (iob[buf_idx].callback != NULL)
iob[buf_idx].callback(channel, iob + buf_idx);
buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
}
channel->buf_idx = buf_idx;
if (channel->state == LCS_CH_STATE_STOPPED)
lcs_start_channel(channel);
spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
if (channel->state == LCS_CH_STATE_SUSPENDED &&
channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
__lcs_resume_channel(channel);
spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
/* Something happened on the channel. Wake up waiters. */
wake_up(&channel->wait_q);
}
/**
* Finish current tx buffer and make it ready for transmit.
*/
static void
__lcs_emit_txbuffer(struct lcs_card *card)
{
LCS_DBF_TEXT(5, trace, "emittx");
*(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
card->tx_buffer->count += 2;
lcs_ready_buffer(&card->write, card->tx_buffer);
card->tx_buffer = NULL;
card->tx_emitted++;
}
/**
* Callback for finished tx buffers.
*/
static void
lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
struct lcs_card *card;
LCS_DBF_TEXT(5, trace, "txbuffcb");
/* Put buffer back to pool. */
lcs_release_buffer(channel, buffer);
card = container_of(channel, struct lcs_card, write);
if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
netif_wake_queue(card->dev);
spin_lock(&card->lock);
card->tx_emitted--;
if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
/*
* Last running tx buffer has finished. Submit partially
* filled current buffer.
*/
__lcs_emit_txbuffer(card);
spin_unlock(&card->lock);
}
/**
* Packet transmit function called by network stack
*/
static int
__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
struct net_device *dev)
{
struct lcs_header *header;
int rc = NETDEV_TX_OK;
LCS_DBF_TEXT(5, trace, "hardxmit");
if (skb == NULL) {
card->stats.tx_dropped++;
card->stats.tx_errors++;
return NETDEV_TX_OK;
}
if (card->state != DEV_STATE_UP) {
dev_kfree_skb(skb);
card->stats.tx_dropped++;
card->stats.tx_errors++;
card->stats.tx_carrier_errors++;
return NETDEV_TX_OK;
}
if (skb->protocol == htons(ETH_P_IPV6)) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
netif_stop_queue(card->dev);
spin_lock(&card->lock);
if (card->tx_buffer != NULL &&
card->tx_buffer->count + sizeof(struct lcs_header) +
skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
/* skb too big for current tx buffer. */
__lcs_emit_txbuffer(card);
if (card->tx_buffer == NULL) {
/* Get new tx buffer */
card->tx_buffer = lcs_get_buffer(&card->write);
if (card->tx_buffer == NULL) {
card->stats.tx_dropped++;
rc = NETDEV_TX_BUSY;
goto out;
}
card->tx_buffer->callback = lcs_txbuffer_cb;
card->tx_buffer->count = 0;
}
header = (struct lcs_header *)
(card->tx_buffer->data + card->tx_buffer->count);
card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
header->offset = card->tx_buffer->count;
header->type = card->lan_type;
header->slot = card->portno;
skb_copy_from_linear_data(skb, header + 1, skb->len);
spin_unlock(&card->lock);
card->stats.tx_bytes += skb->len;
card->stats.tx_packets++;
dev_kfree_skb(skb);
netif_wake_queue(card->dev);
spin_lock(&card->lock);
if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
/* If this is the first tx buffer emit it immediately. */
__lcs_emit_txbuffer(card);
out:
spin_unlock(&card->lock);
return rc;
}
static int
lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct lcs_card *card;
int rc;
LCS_DBF_TEXT(5, trace, "pktxmit");
card = (struct lcs_card *) dev->ml_priv;
rc = __lcs_start_xmit(card, skb, dev);
return rc;
}
/**
* send startlan and lanstat command to make LCS device ready
*/
static int
lcs_startlan_auto(struct lcs_card *card)
{
int rc;
LCS_DBF_TEXT(2, trace, "strtauto");
#ifdef CONFIG_ETHERNET
card->lan_type = LCS_FRAME_TYPE_ENET;
rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
if (rc == 0)
return 0;
#endif
#ifdef CONFIG_FDDI
card->lan_type = LCS_FRAME_TYPE_FDDI;
rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
if (rc == 0)
return 0;
#endif
return -EIO;
}
static int
lcs_startlan(struct lcs_card *card)
{
int rc, i;
LCS_DBF_TEXT(2, trace, "startlan");
rc = 0;
if (card->portno != LCS_INVALID_PORT_NO) {
if (card->lan_type == LCS_FRAME_TYPE_AUTO)
rc = lcs_startlan_auto(card);
else
rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
} else {
for (i = 0; i <= 16; i++) {
card->portno = i;
if (card->lan_type != LCS_FRAME_TYPE_AUTO)
rc = lcs_send_startlan(card,
LCS_INITIATOR_TCPIP);
else
/* autodetecting lan type */
rc = lcs_startlan_auto(card);
if (rc == 0)
break;
}
}
if (rc == 0)
return lcs_send_lanstat(card);
return rc;
}
/**
* LCS detect function
* setup channels and make them I/O ready
*/
static int
lcs_detect(struct lcs_card *card)
{
int rc = 0;
LCS_DBF_TEXT(2, setup, "lcsdetct");
/* start/reset card */
if (card->dev)
netif_stop_queue(card->dev);
rc = lcs_stop_channels(card);
if (rc == 0) {
rc = lcs_start_channels(card);
if (rc == 0) {
rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
if (rc == 0)
rc = lcs_startlan(card);
}
}
if (rc == 0) {
card->state = DEV_STATE_UP;
} else {
card->state = DEV_STATE_DOWN;
card->write.state = LCS_CH_STATE_INIT;
card->read.state = LCS_CH_STATE_INIT;
}
return rc;
}
/**
* LCS Stop card
*/
static int
lcs_stopcard(struct lcs_card *card)
{
int rc;
LCS_DBF_TEXT(3, setup, "stopcard");
if (card->read.state != LCS_CH_STATE_STOPPED &&
card->write.state != LCS_CH_STATE_STOPPED &&
card->read.state != LCS_CH_STATE_ERROR &&
card->write.state != LCS_CH_STATE_ERROR &&
card->state == DEV_STATE_UP) {
lcs_clear_multicast_list(card);
rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
rc = lcs_send_shutdown(card);
}
rc = lcs_stop_channels(card);
card->state = DEV_STATE_DOWN;
return rc;
}
/**
* Kernel Thread helper functions for LGW initiated commands
*/
static void
lcs_start_kernel_thread(struct work_struct *work)
{
struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
LCS_DBF_TEXT(5, trace, "krnthrd");
if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
kthread_run(lcs_recovery, card, "lcs_recover");
#ifdef CONFIG_IP_MULTICAST
if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
kthread_run(lcs_register_mc_addresses, card, "regipm");
#endif
}
/**
* Process control frames.
*/
static void
lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
{
LCS_DBF_TEXT(5, trace, "getctrl");
if (cmd->initiator == LCS_INITIATOR_LGW) {
switch(cmd->cmd_code) {
case LCS_CMD_STARTUP:
case LCS_CMD_STARTLAN:
lcs_schedule_recovery(card);
break;
case LCS_CMD_STOPLAN:
pr_warn("Stoplan for %s initiated by LGW\n",
card->dev->name);
if (card->dev)
netif_carrier_off(card->dev);
break;
default:
LCS_DBF_TEXT(5, trace, "noLGWcmd");
break;
}
} else
lcs_notify_lancmd_waiters(card, cmd);
}
/**
* Unpack network packet.
*/
static void
lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
{
struct sk_buff *skb;
LCS_DBF_TEXT(5, trace, "getskb");
if (card->dev == NULL ||
card->state != DEV_STATE_UP)
/* The card isn't up. Ignore the packet. */
return;
skb = dev_alloc_skb(skb_len);
if (skb == NULL) {
dev_err(&card->dev->dev,
" Allocating a socket buffer to interface %s failed\n",
card->dev->name);
card->stats.rx_dropped++;
return;
}
skb_put_data(skb, skb_data, skb_len);
skb->protocol = card->lan_type_trans(skb, card->dev);
card->stats.rx_bytes += skb_len;
card->stats.rx_packets++;
if (skb->protocol == htons(ETH_P_802_2))
*((__u32 *)skb->cb) = ++card->pkt_seq;
netif_rx(skb);
}
/**
* LCS main routine to get packets and lancmd replies from the buffers
*/
static void
lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
struct lcs_card *card;
struct lcs_header *lcs_hdr;
__u16 offset;
LCS_DBF_TEXT(5, trace, "lcsgtpkt");
lcs_hdr = (struct lcs_header *) buffer->data;
if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
LCS_DBF_TEXT(4, trace, "-eiogpkt");
return;
}
card = container_of(channel, struct lcs_card, read);
offset = 0;
while (lcs_hdr->offset != 0) {
if (lcs_hdr->offset <= 0 ||
lcs_hdr->offset > LCS_IOBUFFERSIZE ||
lcs_hdr->offset < offset) {
/* Offset invalid. */
card->stats.rx_length_errors++;
card->stats.rx_errors++;
return;
}
/* What kind of frame is it? */
if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
/* Control frame. */
lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
lcs_hdr->type == LCS_FRAME_TYPE_TR ||
lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
/* Normal network packet. */
lcs_get_skb(card, (char *)(lcs_hdr + 1),
lcs_hdr->offset - offset -
sizeof(struct lcs_header));
else
/* Unknown frame type. */
; // FIXME: error message ?
/* Proceed to next frame. */
offset = lcs_hdr->offset;
lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
lcs_hdr = (struct lcs_header *) (buffer->data + offset);
}
/* The buffer is now empty. Make it ready again. */
lcs_ready_buffer(&card->read, buffer);
}
/**
* get network statistics for ifconfig and other user programs
*/
static struct net_device_stats *
lcs_getstats(struct net_device *dev)
{
struct lcs_card *card;
LCS_DBF_TEXT(4, trace, "netstats");
card = (struct lcs_card *) dev->ml_priv;
return &card->stats;
}
/**
* stop lcs device
* This function will be called by user doing ifconfig xxx down
*/
static int
lcs_stop_device(struct net_device *dev)
{
struct lcs_card *card;
int rc;
LCS_DBF_TEXT(2, trace, "stopdev");
card = (struct lcs_card *) dev->ml_priv;
netif_carrier_off(dev);
netif_tx_disable(dev);
dev->flags &= ~IFF_UP;
wait_event(card->write.wait_q,
(card->write.state != LCS_CH_STATE_RUNNING));
rc = lcs_stopcard(card);
if (rc)
dev_err(&card->dev->dev,
" Shutting down the LCS device failed\n");
return rc;
}
/**
* start lcs device and make it runnable
* This function will be called by user doing ifconfig xxx up
*/
static int
lcs_open_device(struct net_device *dev)
{
struct lcs_card *card;
int rc;
LCS_DBF_TEXT(2, trace, "opendev");
card = (struct lcs_card *) dev->ml_priv;
/* initialize statistics */
rc = lcs_detect(card);
if (rc) {
pr_err("Error in opening device!\n");
} else {
dev->flags |= IFF_UP;
netif_carrier_on(dev);
netif_wake_queue(dev);
card->state = DEV_STATE_UP;
}
return rc;
}
/**
* show function for portno called by cat or similar things
*/
static ssize_t
lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
{
struct lcs_card *card;
card = dev_get_drvdata(dev);
if (!card)
return 0;
return sprintf(buf, "%d\n", card->portno);
}
/**
* store the value which is piped to file portno
*/
static ssize_t
lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct lcs_card *card;
int rc;
s16 value;
card = dev_get_drvdata(dev);
if (!card)
return 0;
rc = kstrtos16(buf, 0, &value);
if (rc)
return -EINVAL;
/* TODO: sanity checks */
card->portno = value;
return count;
}
static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
static const char *lcs_type[] = {
"not a channel",
"2216 parallel",
"2216 channel",
"OSA LCS card",
"unknown channel type",
"unsupported channel type",
};
static ssize_t
lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct ccwgroup_device *cgdev;
cgdev = to_ccwgroupdev(dev);
if (!cgdev)
return -ENODEV;
return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
}
static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
static ssize_t
lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct lcs_card *card;
card = dev_get_drvdata(dev);
return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
}
static ssize_t
lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct lcs_card *card;
unsigned int value;
int rc;
card = dev_get_drvdata(dev);
if (!card)
return 0;
rc = kstrtouint(buf, 0, &value);
if (rc)
return -EINVAL;
/* TODO: sanity checks */
card->lancmd_timeout = value;
return count;
}
static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
static ssize_t
lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct lcs_card *card = dev_get_drvdata(dev);
char *tmp;
int i;
if (!card)
return -EINVAL;
if (card->state != DEV_STATE_UP)
return -EPERM;
i = simple_strtoul(buf, &tmp, 16);
if (i == 1)
lcs_schedule_recovery(card);
return count;
}
static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
static struct attribute * lcs_attrs[] = {
&dev_attr_portno.attr,
&dev_attr_type.attr,
&dev_attr_lancmd_timeout.attr,
&dev_attr_recover.attr,
NULL,
};
static struct attribute_group lcs_attr_group = {
.attrs = lcs_attrs,
};
static const struct attribute_group *lcs_attr_groups[] = {
&lcs_attr_group,
NULL,
};
static const struct device_type lcs_devtype = {
.name = "lcs",
.groups = lcs_attr_groups,
};
/**
* lcs_probe_device is called on establishing a new ccwgroup_device.
*/
static int
lcs_probe_device(struct ccwgroup_device *ccwgdev)
{
struct lcs_card *card;
if (!get_device(&ccwgdev->dev))
return -ENODEV;
LCS_DBF_TEXT(2, setup, "add_dev");
card = lcs_alloc_card();
if (!card) {
LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
put_device(&ccwgdev->dev);
return -ENOMEM;
}
dev_set_drvdata(&ccwgdev->dev, card);
ccwgdev->cdev[0]->handler = lcs_irq;
ccwgdev->cdev[1]->handler = lcs_irq;
card->gdev = ccwgdev;
INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
card->thread_start_mask = 0;
card->thread_allowed_mask = 0;
card->thread_running_mask = 0;
ccwgdev->dev.type = &lcs_devtype;
return 0;
}
static int
lcs_register_netdev(struct ccwgroup_device *ccwgdev)
{
struct lcs_card *card;
LCS_DBF_TEXT(2, setup, "regnetdv");
card = dev_get_drvdata(&ccwgdev->dev);
if (card->dev->reg_state != NETREG_UNINITIALIZED)
return 0;
SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
return register_netdev(card->dev);
}
/**
* lcs_new_device will be called by setting the group device online.
*/
static const struct net_device_ops lcs_netdev_ops = {
.ndo_open = lcs_open_device,
.ndo_stop = lcs_stop_device,
.ndo_get_stats = lcs_getstats,
.ndo_start_xmit = lcs_start_xmit,
};
static const struct net_device_ops lcs_mc_netdev_ops = {
.ndo_open = lcs_open_device,
.ndo_stop = lcs_stop_device,
.ndo_get_stats = lcs_getstats,
.ndo_start_xmit = lcs_start_xmit,
.ndo_set_rx_mode = lcs_set_multicast_list,
};
static int
lcs_new_device(struct ccwgroup_device *ccwgdev)
{
struct lcs_card *card;
struct net_device *dev=NULL;
enum lcs_dev_states recover_state;
int rc;
card = dev_get_drvdata(&ccwgdev->dev);
if (!card)
return -ENODEV;
LCS_DBF_TEXT(2, setup, "newdev");
LCS_DBF_HEX(3, setup, &card, sizeof(void*));
card->read.ccwdev = ccwgdev->cdev[0];
card->write.ccwdev = ccwgdev->cdev[1];
recover_state = card->state;
rc = ccw_device_set_online(card->read.ccwdev);
if (rc)
goto out_err;
rc = ccw_device_set_online(card->write.ccwdev);
if (rc)
goto out_werr;
LCS_DBF_TEXT(3, setup, "lcsnewdv");
lcs_setup_card(card);
rc = lcs_detect(card);
if (rc) {
LCS_DBF_TEXT(2, setup, "dtctfail");
dev_err(&ccwgdev->dev,
"Detecting a network adapter for LCS devices"
" failed with rc=%d (0x%x)\n", rc, rc);
lcs_stopcard(card);
goto out;
}
if (card->dev) {
LCS_DBF_TEXT(2, setup, "samedev");
LCS_DBF_HEX(3, setup, &card, sizeof(void*));
goto netdev_out;
}
switch (card->lan_type) {
#ifdef CONFIG_ETHERNET
case LCS_FRAME_TYPE_ENET:
card->lan_type_trans = eth_type_trans;
dev = alloc_etherdev(0);
break;
#endif
#ifdef CONFIG_FDDI
case LCS_FRAME_TYPE_FDDI:
card->lan_type_trans = fddi_type_trans;
dev = alloc_fddidev(0);
break;
#endif
default:
LCS_DBF_TEXT(3, setup, "errinit");
pr_err(" Initialization failed\n");
goto out;
}
if (!dev)
goto out;
card->dev = dev;
card->dev->ml_priv = card;
card->dev->netdev_ops = &lcs_netdev_ops;
memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
#ifdef CONFIG_IP_MULTICAST
if (!lcs_check_multicast_support(card))
card->dev->netdev_ops = &lcs_mc_netdev_ops;
#endif
netdev_out:
lcs_set_allowed_threads(card,0xffffffff);
if (recover_state == DEV_STATE_RECOVER) {
lcs_set_multicast_list(card->dev);
card->dev->flags |= IFF_UP;
netif_carrier_on(card->dev);
netif_wake_queue(card->dev);
card->state = DEV_STATE_UP;
} else {
lcs_stopcard(card);
}
if (lcs_register_netdev(ccwgdev) != 0)
goto out;
/* Print out supported assists: IPv6 */
pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
(card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
"with" : "without");
/* Print out supported assist: Multicast */
pr_info("LCS device %s %s Multicast support\n", card->dev->name,
(card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
"with" : "without");
return 0;
out:
ccw_device_set_offline(card->write.ccwdev);
out_werr:
ccw_device_set_offline(card->read.ccwdev);
out_err:
return -ENODEV;
}
/**
* lcs_shutdown_device, called when setting the group device offline.
*/
static int
__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
{
struct lcs_card *card;
enum lcs_dev_states recover_state;
int ret = 0, ret2 = 0, ret3 = 0;
LCS_DBF_TEXT(3, setup, "shtdndev");
card = dev_get_drvdata(&ccwgdev->dev);
if (!card)
return -ENODEV;
if (recovery_mode == 0) {
lcs_set_allowed_threads(card, 0);
if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
return -ERESTARTSYS;
}
LCS_DBF_HEX(3, setup, &card, sizeof(void*));
recover_state = card->state;
ret = lcs_stop_device(card->dev);
ret2 = ccw_device_set_offline(card->read.ccwdev);
ret3 = ccw_device_set_offline(card->write.ccwdev);
if (!ret)
ret = (ret2) ? ret2 : ret3;
if (ret)
LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
if (recover_state == DEV_STATE_UP) {
card->state = DEV_STATE_RECOVER;
}
return 0;
}
static int
lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
{
return __lcs_shutdown_device(ccwgdev, 0);
}
/**
* drive lcs recovery after startup and startlan initiated by Lan Gateway
*/
static int
lcs_recovery(void *ptr)
{
struct lcs_card *card;
struct ccwgroup_device *gdev;
int rc;
card = (struct lcs_card *) ptr;
LCS_DBF_TEXT(4, trace, "recover1");
if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
return 0;
LCS_DBF_TEXT(4, trace, "recover2");
gdev = card->gdev;
dev_warn(&gdev->dev,
"A recovery process has been started for the LCS device\n");
rc = __lcs_shutdown_device(gdev, 1);
rc = lcs_new_device(gdev);
if (!rc)
pr_info("Device %s successfully recovered!\n",
card->dev->name);
else
pr_info("Device %s could not be recovered!\n",
card->dev->name);
lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
return 0;
}
/**
* lcs_remove_device, free buffers and card
*/
static void
lcs_remove_device(struct ccwgroup_device *ccwgdev)
{
struct lcs_card *card;
card = dev_get_drvdata(&ccwgdev->dev);
if (!card)
return;
LCS_DBF_TEXT(3, setup, "remdev");
LCS_DBF_HEX(3, setup, &card, sizeof(void*));
if (ccwgdev->state == CCWGROUP_ONLINE) {
lcs_shutdown_device(ccwgdev);
}
if (card->dev)
unregister_netdev(card->dev);
lcs_cleanup_card(card);
lcs_free_card(card);
dev_set_drvdata(&ccwgdev->dev, NULL);
put_device(&ccwgdev->dev);
}
static int lcs_pm_suspend(struct lcs_card *card)
{
if (card->dev)
netif_device_detach(card->dev);
lcs_set_allowed_threads(card, 0);
lcs_wait_for_threads(card, 0xffffffff);
if (card->state != DEV_STATE_DOWN)
__lcs_shutdown_device(card->gdev, 1);
return 0;
}
static int lcs_pm_resume(struct lcs_card *card)
{
int rc = 0;
if (card->state == DEV_STATE_RECOVER)
rc = lcs_new_device(card->gdev);
if (card->dev)
netif_device_attach(card->dev);
if (rc) {
dev_warn(&card->gdev->dev, "The lcs device driver "
"failed to recover the device\n");
}
return rc;
}
static int lcs_prepare(struct ccwgroup_device *gdev)
{
return 0;
}
static void lcs_complete(struct ccwgroup_device *gdev)
{
return;
}
static int lcs_freeze(struct ccwgroup_device *gdev)
{
struct lcs_card *card = dev_get_drvdata(&gdev->dev);
return lcs_pm_suspend(card);
}
static int lcs_thaw(struct ccwgroup_device *gdev)
{
struct lcs_card *card = dev_get_drvdata(&gdev->dev);
return lcs_pm_resume(card);
}
static int lcs_restore(struct ccwgroup_device *gdev)
{
struct lcs_card *card = dev_get_drvdata(&gdev->dev);
return lcs_pm_resume(card);
}
static struct ccw_device_id lcs_ids[] = {
{CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
{CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
{CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
{},
};
MODULE_DEVICE_TABLE(ccw, lcs_ids);
static struct ccw_driver lcs_ccw_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "lcs",
},
.ids = lcs_ids,
.probe = ccwgroup_probe_ccwdev,
.remove = ccwgroup_remove_ccwdev,
.int_class = IRQIO_LCS,
};
/**
* LCS ccwgroup driver registration
*/
static struct ccwgroup_driver lcs_group_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "lcs",
},
.ccw_driver = &lcs_ccw_driver,
.setup = lcs_probe_device,
.remove = lcs_remove_device,
.set_online = lcs_new_device,
.set_offline = lcs_shutdown_device,
.prepare = lcs_prepare,
.complete = lcs_complete,
.freeze = lcs_freeze,
.thaw = lcs_thaw,
.restore = lcs_restore,
};
static ssize_t group_store(struct device_driver *ddrv, const char *buf,
size_t count)
{
int err;
err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
return err ? err : count;
}
static DRIVER_ATTR_WO(group);
static struct attribute *lcs_drv_attrs[] = {
&driver_attr_group.attr,
NULL,
};
static struct attribute_group lcs_drv_attr_group = {
.attrs = lcs_drv_attrs,
};
static const struct attribute_group *lcs_drv_attr_groups[] = {
&lcs_drv_attr_group,
NULL,
};
/**
* LCS Module/Kernel initialization function
*/
static int
__init lcs_init_module(void)
{
int rc;
pr_info("Loading %s\n", version);
rc = lcs_register_debug_facility();
LCS_DBF_TEXT(0, setup, "lcsinit");
if (rc)
goto out_err;
lcs_root_dev = root_device_register("lcs");
rc = PTR_ERR_OR_ZERO(lcs_root_dev);
if (rc)
goto register_err;
rc = ccw_driver_register(&lcs_ccw_driver);
if (rc)
goto ccw_err;
lcs_group_driver.driver.groups = lcs_drv_attr_groups;
rc = ccwgroup_driver_register(&lcs_group_driver);
if (rc)
goto ccwgroup_err;
return 0;
ccwgroup_err:
ccw_driver_unregister(&lcs_ccw_driver);
ccw_err:
root_device_unregister(lcs_root_dev);
register_err:
lcs_unregister_debug_facility();
out_err:
pr_err("Initializing the lcs device driver failed\n");
return rc;
}
/**
* LCS module cleanup function
*/
static void
__exit lcs_cleanup_module(void)
{
pr_info("Terminating lcs module.\n");
LCS_DBF_TEXT(0, trace, "cleanup");
ccwgroup_driver_unregister(&lcs_group_driver);
ccw_driver_unregister(&lcs_ccw_driver);
root_device_unregister(lcs_root_dev);
lcs_unregister_debug_facility();
}
module_init(lcs_init_module);
module_exit(lcs_cleanup_module);
MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
MODULE_LICENSE("GPL");
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