--- /dev/null
+/*
+ * 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 inline 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 inline 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 inline 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 inline 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 inline 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(unsigned long data)
+{
+ struct lcs_reply *reply, *list_reply, *r;
+ unsigned long flags;
+
+ LCS_DBF_TEXT(4, trace, "timeout");
+ reply = (struct lcs_reply *) data;
+ 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;
+ struct timer_list timer;
+ 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;
+ init_timer_on_stack(&timer);
+ timer.function = lcs_lancmd_timeout;
+ timer.data = (unsigned long) reply;
+ timer.expires = jiffies + HZ*card->lancmd_timeout;
+ add_timer(&timer);
+ wait_event(reply->wait_q, reply->received);
+ del_timer_sync(&timer);
+ destroy_timer_on_stack(&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 inline 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 inline 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 inline 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_warning("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;
+ }
+ memcpy(skb_put(skb, skb_len), 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(&card->dev->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",
+ },
+ .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 lcs_driver_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(group, 0200, NULL, lcs_driver_group_store);
+
+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");
+
Code Review / kvmfornfv.git / blobdiff