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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Linux for S/390 LAN channel station device driver4 *5 * Copyright IBM Corp. 1999, 20096 * Author(s): Original Code written by7 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>8 * Rewritten by9 * Frank Pavlic <fpavlic@de.ibm.com> and10 * Martin Schwidefsky <schwidefsky@de.ibm.com>11 */12 13#define KMSG_COMPONENT "lcs"14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt15 16#include <linux/module.h>17#include <linux/if.h>18#include <linux/netdevice.h>19#include <linux/etherdevice.h>20#include <linux/inetdevice.h>21#include <linux/in.h>22#include <linux/igmp.h>23#include <linux/delay.h>24#include <linux/kthread.h>25#include <linux/slab.h>26#include <net/arp.h>27#include <net/ip.h>28 29#include <asm/debug.h>30#include <asm/idals.h>31#include <asm/timex.h>32#include <linux/device.h>33#include <asm/ccwgroup.h>34 35#include "lcs.h"36 37 38/*39 * initialization string for output40 */41 42static char version[] __initdata = "LCS driver";43 44/*45 * the root device for lcs group devices46 */47static struct device *lcs_root_dev;48 49/*50 * Some prototypes.51 */52static void lcs_tasklet(unsigned long);53static void lcs_start_kernel_thread(struct work_struct *);54static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);55#ifdef CONFIG_IP_MULTICAST56static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);57#endif /* CONFIG_IP_MULTICAST */58static int lcs_recovery(void *ptr);59 60/*61 * Debug Facility Stuff62 */63static char debug_buffer[255];64static debug_info_t *lcs_dbf_setup;65static debug_info_t *lcs_dbf_trace;66 67/*68 * LCS Debug Facility functions69 */70static void71lcs_unregister_debug_facility(void)72{73 debug_unregister(lcs_dbf_setup);74 debug_unregister(lcs_dbf_trace);75}76 77static int78lcs_register_debug_facility(void)79{80 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);81 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);82 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {83 pr_err("Not enough memory for debug facility.\n");84 lcs_unregister_debug_facility();85 return -ENOMEM;86 }87 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);88 debug_set_level(lcs_dbf_setup, 2);89 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);90 debug_set_level(lcs_dbf_trace, 2);91 return 0;92}93 94/*95 * Allocate io buffers.96 */97static int98lcs_alloc_channel(struct lcs_channel *channel)99{100 int cnt;101 102 LCS_DBF_TEXT(2, setup, "ichalloc");103 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {104 /* alloc memory fo iobuffer */105 channel->iob[cnt].data =106 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);107 if (channel->iob[cnt].data == NULL)108 break;109 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;110 }111 if (cnt < LCS_NUM_BUFFS) {112 /* Not all io buffers could be allocated. */113 LCS_DBF_TEXT(2, setup, "echalloc");114 while (cnt-- > 0)115 kfree(channel->iob[cnt].data);116 return -ENOMEM;117 }118 return 0;119}120 121/*122 * Free io buffers.123 */124static void125lcs_free_channel(struct lcs_channel *channel)126{127 int cnt;128 129 LCS_DBF_TEXT(2, setup, "ichfree");130 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {131 kfree(channel->iob[cnt].data);132 channel->iob[cnt].data = NULL;133 }134}135 136/*137 * Cleanup channel.138 */139static void140lcs_cleanup_channel(struct lcs_channel *channel)141{142 LCS_DBF_TEXT(3, setup, "cleanch");143 /* Kill write channel tasklets. */144 tasklet_kill(&channel->irq_tasklet);145 /* Free channel buffers. */146 lcs_free_channel(channel);147}148 149/*150 * LCS free memory for card and channels.151 */152static void153lcs_free_card(struct lcs_card *card)154{155 LCS_DBF_TEXT(2, setup, "remcard");156 LCS_DBF_HEX(2, setup, &card, sizeof(void*));157 kfree(card);158}159 160/*161 * LCS alloc memory for card and channels162 */163static struct lcs_card *164lcs_alloc_card(void)165{166 struct lcs_card *card;167 int rc;168 169 LCS_DBF_TEXT(2, setup, "alloclcs");170 171 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);172 if (card == NULL)173 return NULL;174 card->lan_type = LCS_FRAME_TYPE_AUTO;175 card->pkt_seq = 0;176 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;177 /* Allocate io buffers for the read channel. */178 rc = lcs_alloc_channel(&card->read);179 if (rc){180 LCS_DBF_TEXT(2, setup, "iccwerr");181 lcs_free_card(card);182 return NULL;183 }184 /* Allocate io buffers for the write channel. */185 rc = lcs_alloc_channel(&card->write);186 if (rc) {187 LCS_DBF_TEXT(2, setup, "iccwerr");188 lcs_cleanup_channel(&card->read);189 lcs_free_card(card);190 return NULL;191 }192 193#ifdef CONFIG_IP_MULTICAST194 INIT_LIST_HEAD(&card->ipm_list);195#endif196 LCS_DBF_HEX(2, setup, &card, sizeof(void*));197 return card;198}199 200/*201 * Setup read channel.202 */203static void204lcs_setup_read_ccws(struct lcs_card *card)205{206 int cnt;207 208 LCS_DBF_TEXT(2, setup, "ireadccw");209 /* Setup read ccws. */210 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));211 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {212 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;213 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;214 card->read.ccws[cnt].flags =215 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;216 /*217 * Note: we have allocated the buffer with GFP_DMA, so218 * we do not need to do set_normalized_cda.219 */220 card->read.ccws[cnt].cda =221 virt_to_dma32(card->read.iob[cnt].data);222 ((struct lcs_header *)223 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;224 card->read.iob[cnt].callback = lcs_get_frames_cb;225 card->read.iob[cnt].state = LCS_BUF_STATE_READY;226 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;227 }228 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;229 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;230 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;231 /* Last ccw is a tic (transfer in channel). */232 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;233 card->read.ccws[LCS_NUM_BUFFS].cda = virt_to_dma32(card->read.ccws);234 /* Setg initial state of the read channel. */235 card->read.state = LCS_CH_STATE_INIT;236 237 card->read.io_idx = 0;238 card->read.buf_idx = 0;239}240 241static void242lcs_setup_read(struct lcs_card *card)243{244 LCS_DBF_TEXT(3, setup, "initread");245 246 lcs_setup_read_ccws(card);247 /* Initialize read channel tasklet. */248 card->read.irq_tasklet.data = (unsigned long) &card->read;249 card->read.irq_tasklet.func = lcs_tasklet;250 /* Initialize waitqueue. */251 init_waitqueue_head(&card->read.wait_q);252}253 254/*255 * Setup write channel.256 */257static void258lcs_setup_write_ccws(struct lcs_card *card)259{260 int cnt;261 262 LCS_DBF_TEXT(3, setup, "iwritccw");263 /* Setup write ccws. */264 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));265 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {266 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;267 card->write.ccws[cnt].count = 0;268 card->write.ccws[cnt].flags =269 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;270 /*271 * Note: we have allocated the buffer with GFP_DMA, so272 * we do not need to do set_normalized_cda.273 */274 card->write.ccws[cnt].cda =275 virt_to_dma32(card->write.iob[cnt].data);276 }277 /* Last ccw is a tic (transfer in channel). */278 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;279 card->write.ccws[LCS_NUM_BUFFS].cda = virt_to_dma32(card->write.ccws);280 /* Set initial state of the write channel. */281 card->read.state = LCS_CH_STATE_INIT;282 283 card->write.io_idx = 0;284 card->write.buf_idx = 0;285}286 287static void288lcs_setup_write(struct lcs_card *card)289{290 LCS_DBF_TEXT(3, setup, "initwrit");291 292 lcs_setup_write_ccws(card);293 /* Initialize write channel tasklet. */294 card->write.irq_tasklet.data = (unsigned long) &card->write;295 card->write.irq_tasklet.func = lcs_tasklet;296 /* Initialize waitqueue. */297 init_waitqueue_head(&card->write.wait_q);298}299 300static void301lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)302{303 unsigned long flags;304 305 spin_lock_irqsave(&card->mask_lock, flags);306 card->thread_allowed_mask = threads;307 spin_unlock_irqrestore(&card->mask_lock, flags);308 wake_up(&card->wait_q);309}310static int lcs_threads_running(struct lcs_card *card, unsigned long threads)311{312 unsigned long flags;313 int rc = 0;314 315 spin_lock_irqsave(&card->mask_lock, flags);316 rc = (card->thread_running_mask & threads);317 spin_unlock_irqrestore(&card->mask_lock, flags);318 return rc;319}320 321static int322lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)323{324 return wait_event_interruptible(card->wait_q,325 lcs_threads_running(card, threads) == 0);326}327 328static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)329{330 unsigned long flags;331 332 spin_lock_irqsave(&card->mask_lock, flags);333 if ( !(card->thread_allowed_mask & thread) ||334 (card->thread_start_mask & thread) ) {335 spin_unlock_irqrestore(&card->mask_lock, flags);336 return -EPERM;337 }338 card->thread_start_mask |= thread;339 spin_unlock_irqrestore(&card->mask_lock, flags);340 return 0;341}342 343static void344lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)345{346 unsigned long flags;347 348 spin_lock_irqsave(&card->mask_lock, flags);349 card->thread_running_mask &= ~thread;350 spin_unlock_irqrestore(&card->mask_lock, flags);351 wake_up(&card->wait_q);352}353 354static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)355{356 unsigned long flags;357 int rc = 0;358 359 spin_lock_irqsave(&card->mask_lock, flags);360 if (card->thread_start_mask & thread){361 if ((card->thread_allowed_mask & thread) &&362 !(card->thread_running_mask & thread)){363 rc = 1;364 card->thread_start_mask &= ~thread;365 card->thread_running_mask |= thread;366 } else367 rc = -EPERM;368 }369 spin_unlock_irqrestore(&card->mask_lock, flags);370 return rc;371}372 373static int374lcs_do_run_thread(struct lcs_card *card, unsigned long thread)375{376 int rc = 0;377 wait_event(card->wait_q,378 (rc = __lcs_do_run_thread(card, thread)) >= 0);379 return rc;380}381 382static int383lcs_do_start_thread(struct lcs_card *card, unsigned long thread)384{385 unsigned long flags;386 int rc = 0;387 388 spin_lock_irqsave(&card->mask_lock, flags);389 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",390 (u8) card->thread_start_mask,391 (u8) card->thread_allowed_mask,392 (u8) card->thread_running_mask);393 rc = (card->thread_start_mask & thread);394 spin_unlock_irqrestore(&card->mask_lock, flags);395 return rc;396}397 398/*399 * Initialize channels,card and state machines.400 */401static void402lcs_setup_card(struct lcs_card *card)403{404 LCS_DBF_TEXT(2, setup, "initcard");405 LCS_DBF_HEX(2, setup, &card, sizeof(void*));406 407 lcs_setup_read(card);408 lcs_setup_write(card);409 /* Set cards initial state. */410 card->state = DEV_STATE_DOWN;411 card->tx_buffer = NULL;412 card->tx_emitted = 0;413 414 init_waitqueue_head(&card->wait_q);415 spin_lock_init(&card->lock);416 spin_lock_init(&card->ipm_lock);417 spin_lock_init(&card->mask_lock);418#ifdef CONFIG_IP_MULTICAST419 INIT_LIST_HEAD(&card->ipm_list);420#endif421 INIT_LIST_HEAD(&card->lancmd_waiters);422}423 424static void lcs_clear_multicast_list(struct lcs_card *card)425{426#ifdef CONFIG_IP_MULTICAST427 struct lcs_ipm_list *ipm;428 unsigned long flags;429 430 /* Free multicast list. */431 LCS_DBF_TEXT(3, setup, "clmclist");432 spin_lock_irqsave(&card->ipm_lock, flags);433 while (!list_empty(&card->ipm_list)){434 ipm = list_entry(card->ipm_list.next,435 struct lcs_ipm_list, list);436 list_del(&ipm->list);437 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){438 spin_unlock_irqrestore(&card->ipm_lock, flags);439 lcs_send_delipm(card, ipm);440 spin_lock_irqsave(&card->ipm_lock, flags);441 }442 kfree(ipm);443 }444 spin_unlock_irqrestore(&card->ipm_lock, flags);445#endif446}447 448/*449 * Cleanup channels,card and state machines.450 */451static void452lcs_cleanup_card(struct lcs_card *card)453{454 455 LCS_DBF_TEXT(3, setup, "cleancrd");456 LCS_DBF_HEX(2,setup,&card,sizeof(void*));457 458 if (card->dev != NULL)459 free_netdev(card->dev);460 /* Cleanup channels. */461 lcs_cleanup_channel(&card->write);462 lcs_cleanup_channel(&card->read);463}464 465/*466 * Start channel.467 */468static int469lcs_start_channel(struct lcs_channel *channel)470{471 unsigned long flags;472 int rc;473 474 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));475 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);476 rc = ccw_device_start(channel->ccwdev,477 channel->ccws + channel->io_idx, 0, 0,478 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);479 if (rc == 0)480 channel->state = LCS_CH_STATE_RUNNING;481 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);482 if (rc) {483 LCS_DBF_TEXT_(4,trace,"essh%s",484 dev_name(&channel->ccwdev->dev));485 dev_err(&channel->ccwdev->dev,486 "Starting an LCS device resulted in an error,"487 " rc=%d!\n", rc);488 }489 return rc;490}491 492static int493lcs_clear_channel(struct lcs_channel *channel)494{495 unsigned long flags;496 int rc;497 498 LCS_DBF_TEXT(4,trace,"clearch");499 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));500 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);501 rc = ccw_device_clear(channel->ccwdev, 0);502 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);503 if (rc) {504 LCS_DBF_TEXT_(4, trace, "ecsc%s",505 dev_name(&channel->ccwdev->dev));506 return rc;507 }508 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));509 channel->state = LCS_CH_STATE_STOPPED;510 return rc;511}512 513 514/*515 * Stop channel.516 */517static int518lcs_stop_channel(struct lcs_channel *channel)519{520 unsigned long flags;521 int rc;522 523 if (channel->state == LCS_CH_STATE_STOPPED)524 return 0;525 LCS_DBF_TEXT(4,trace,"haltsch");526 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));527 channel->state = LCS_CH_STATE_INIT;528 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);529 rc = ccw_device_halt(channel->ccwdev, 0);530 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);531 if (rc) {532 LCS_DBF_TEXT_(4, trace, "ehsc%s",533 dev_name(&channel->ccwdev->dev));534 return rc;535 }536 /* Asynchronous halt initialted. Wait for its completion. */537 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));538 lcs_clear_channel(channel);539 return 0;540}541 542/*543 * start read and write channel544 */545static int546lcs_start_channels(struct lcs_card *card)547{548 int rc;549 550 LCS_DBF_TEXT(2, trace, "chstart");551 /* start read channel */552 rc = lcs_start_channel(&card->read);553 if (rc)554 return rc;555 /* start write channel */556 rc = lcs_start_channel(&card->write);557 if (rc)558 lcs_stop_channel(&card->read);559 return rc;560}561 562/*563 * stop read and write channel564 */565static int566lcs_stop_channels(struct lcs_card *card)567{568 LCS_DBF_TEXT(2, trace, "chhalt");569 lcs_stop_channel(&card->read);570 lcs_stop_channel(&card->write);571 return 0;572}573 574/*575 * Get empty buffer.576 */577static struct lcs_buffer *578__lcs_get_buffer(struct lcs_channel *channel)579{580 int index;581 582 LCS_DBF_TEXT(5, trace, "_getbuff");583 index = channel->io_idx;584 do {585 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {586 channel->iob[index].state = LCS_BUF_STATE_LOCKED;587 return channel->iob + index;588 }589 index = (index + 1) & (LCS_NUM_BUFFS - 1);590 } while (index != channel->io_idx);591 return NULL;592}593 594static struct lcs_buffer *595lcs_get_buffer(struct lcs_channel *channel)596{597 struct lcs_buffer *buffer;598 unsigned long flags;599 600 LCS_DBF_TEXT(5, trace, "getbuff");601 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);602 buffer = __lcs_get_buffer(channel);603 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);604 return buffer;605}606 607/*608 * Resume channel program if the channel is suspended.609 */610static int611__lcs_resume_channel(struct lcs_channel *channel)612{613 int rc;614 615 if (channel->state != LCS_CH_STATE_SUSPENDED)616 return 0;617 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)618 return 0;619 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));620 rc = ccw_device_resume(channel->ccwdev);621 if (rc) {622 LCS_DBF_TEXT_(4, trace, "ersc%s",623 dev_name(&channel->ccwdev->dev));624 dev_err(&channel->ccwdev->dev,625 "Sending data from the LCS device to the LAN failed"626 " with rc=%d\n",rc);627 } else628 channel->state = LCS_CH_STATE_RUNNING;629 return rc;630 631}632 633/*634 * Make a buffer ready for processing.635 */636static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)637{638 int prev, next;639 640 LCS_DBF_TEXT(5, trace, "rdybits");641 prev = (index - 1) & (LCS_NUM_BUFFS - 1);642 next = (index + 1) & (LCS_NUM_BUFFS - 1);643 /* Check if we may clear the suspend bit of this buffer. */644 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {645 /* Check if we have to set the PCI bit. */646 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))647 /* Suspend bit of the previous buffer is not set. */648 channel->ccws[index].flags |= CCW_FLAG_PCI;649 /* Suspend bit of the next buffer is set. */650 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;651 }652}653 654static int655lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)656{657 unsigned long flags;658 int index, rc;659 660 LCS_DBF_TEXT(5, trace, "rdybuff");661 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&662 buffer->state != LCS_BUF_STATE_PROCESSED);663 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);664 buffer->state = LCS_BUF_STATE_READY;665 index = buffer - channel->iob;666 /* Set length. */667 channel->ccws[index].count = buffer->count;668 /* Check relevant PCI/suspend bits. */669 __lcs_ready_buffer_bits(channel, index);670 rc = __lcs_resume_channel(channel);671 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);672 return rc;673}674 675/*676 * Mark the buffer as processed. Take care of the suspend bit677 * of the previous buffer. This function is called from678 * interrupt context, so the lock must not be taken.679 */680static int681__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)682{683 int index, prev, next;684 685 LCS_DBF_TEXT(5, trace, "prcsbuff");686 BUG_ON(buffer->state != LCS_BUF_STATE_READY);687 buffer->state = LCS_BUF_STATE_PROCESSED;688 index = buffer - channel->iob;689 prev = (index - 1) & (LCS_NUM_BUFFS - 1);690 next = (index + 1) & (LCS_NUM_BUFFS - 1);691 /* Set the suspend bit and clear the PCI bit of this buffer. */692 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;693 channel->ccws[index].flags &= ~CCW_FLAG_PCI;694 /* Check the suspend bit of the previous buffer. */695 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {696 /*697 * Previous buffer is in state ready. It might have698 * happened in lcs_ready_buffer that the suspend bit699 * has not been cleared to avoid an endless loop.700 * Do it now.701 */702 __lcs_ready_buffer_bits(channel, prev);703 }704 /* Clear PCI bit of next buffer. */705 channel->ccws[next].flags &= ~CCW_FLAG_PCI;706 return __lcs_resume_channel(channel);707}708 709/*710 * Put a processed buffer back to state empty.711 */712static void713lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)714{715 unsigned long flags;716 717 LCS_DBF_TEXT(5, trace, "relbuff");718 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&719 buffer->state != LCS_BUF_STATE_PROCESSED);720 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);721 buffer->state = LCS_BUF_STATE_EMPTY;722 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);723}724 725/*726 * Get buffer for a lan command.727 */728static struct lcs_buffer *729lcs_get_lancmd(struct lcs_card *card, int count)730{731 struct lcs_buffer *buffer;732 struct lcs_cmd *cmd;733 734 LCS_DBF_TEXT(4, trace, "getlncmd");735 /* Get buffer and wait if none is available. */736 wait_event(card->write.wait_q,737 ((buffer = lcs_get_buffer(&card->write)) != NULL));738 count += sizeof(struct lcs_header);739 *(__u16 *)(buffer->data + count) = 0;740 buffer->count = count + sizeof(__u16);741 buffer->callback = lcs_release_buffer;742 cmd = (struct lcs_cmd *) buffer->data;743 cmd->offset = count;744 cmd->type = LCS_FRAME_TYPE_CONTROL;745 cmd->slot = 0;746 return buffer;747}748 749 750static void751lcs_get_reply(struct lcs_reply *reply)752{753 refcount_inc(&reply->refcnt);754}755 756static void757lcs_put_reply(struct lcs_reply *reply)758{759 if (refcount_dec_and_test(&reply->refcnt))760 kfree(reply);761}762 763static struct lcs_reply *764lcs_alloc_reply(struct lcs_cmd *cmd)765{766 struct lcs_reply *reply;767 768 LCS_DBF_TEXT(4, trace, "getreply");769 770 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);771 if (!reply)772 return NULL;773 refcount_set(&reply->refcnt, 1);774 reply->sequence_no = cmd->sequence_no;775 reply->received = 0;776 reply->rc = 0;777 init_waitqueue_head(&reply->wait_q);778 779 return reply;780}781 782/*783 * Notifier function for lancmd replies. Called from read irq.784 */785static void786lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)787{788 struct list_head *l, *n;789 struct lcs_reply *reply;790 791 LCS_DBF_TEXT(4, trace, "notiwait");792 spin_lock(&card->lock);793 list_for_each_safe(l, n, &card->lancmd_waiters) {794 reply = list_entry(l, struct lcs_reply, list);795 if (reply->sequence_no == cmd->sequence_no) {796 lcs_get_reply(reply);797 list_del_init(&reply->list);798 if (reply->callback != NULL)799 reply->callback(card, cmd);800 reply->received = 1;801 reply->rc = cmd->return_code;802 wake_up(&reply->wait_q);803 lcs_put_reply(reply);804 break;805 }806 }807 spin_unlock(&card->lock);808}809 810/*811 * Emit buffer of a lan command.812 */813static void814lcs_lancmd_timeout(struct timer_list *t)815{816 struct lcs_reply *reply = from_timer(reply, t, timer);817 struct lcs_reply *list_reply, *r;818 unsigned long flags;819 820 LCS_DBF_TEXT(4, trace, "timeout");821 spin_lock_irqsave(&reply->card->lock, flags);822 list_for_each_entry_safe(list_reply, r,823 &reply->card->lancmd_waiters,list) {824 if (reply == list_reply) {825 lcs_get_reply(reply);826 list_del_init(&reply->list);827 spin_unlock_irqrestore(&reply->card->lock, flags);828 reply->received = 1;829 reply->rc = -ETIME;830 wake_up(&reply->wait_q);831 lcs_put_reply(reply);832 return;833 }834 }835 spin_unlock_irqrestore(&reply->card->lock, flags);836}837 838static int839lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,840 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))841{842 struct lcs_reply *reply;843 struct lcs_cmd *cmd;844 unsigned long flags;845 int rc;846 847 LCS_DBF_TEXT(4, trace, "sendcmd");848 cmd = (struct lcs_cmd *) buffer->data;849 cmd->return_code = 0;850 cmd->sequence_no = card->sequence_no++;851 reply = lcs_alloc_reply(cmd);852 if (!reply)853 return -ENOMEM;854 reply->callback = reply_callback;855 reply->card = card;856 spin_lock_irqsave(&card->lock, flags);857 list_add_tail(&reply->list, &card->lancmd_waiters);858 spin_unlock_irqrestore(&card->lock, flags);859 860 buffer->callback = lcs_release_buffer;861 rc = lcs_ready_buffer(&card->write, buffer);862 if (rc)863 return rc;864 timer_setup(&reply->timer, lcs_lancmd_timeout, 0);865 mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout);866 wait_event(reply->wait_q, reply->received);867 del_timer_sync(&reply->timer);868 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);869 rc = reply->rc;870 lcs_put_reply(reply);871 return rc ? -EIO : 0;872}873 874/*875 * LCS startup command876 */877static int878lcs_send_startup(struct lcs_card *card, __u8 initiator)879{880 struct lcs_buffer *buffer;881 struct lcs_cmd *cmd;882 883 LCS_DBF_TEXT(2, trace, "startup");884 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);885 cmd = (struct lcs_cmd *) buffer->data;886 cmd->cmd_code = LCS_CMD_STARTUP;887 cmd->initiator = initiator;888 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;889 return lcs_send_lancmd(card, buffer, NULL);890}891 892/*893 * LCS shutdown command894 */895static int896lcs_send_shutdown(struct lcs_card *card)897{898 struct lcs_buffer *buffer;899 struct lcs_cmd *cmd;900 901 LCS_DBF_TEXT(2, trace, "shutdown");902 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);903 cmd = (struct lcs_cmd *) buffer->data;904 cmd->cmd_code = LCS_CMD_SHUTDOWN;905 cmd->initiator = LCS_INITIATOR_TCPIP;906 return lcs_send_lancmd(card, buffer, NULL);907}908 909/*910 * LCS lanstat command911 */912static void913__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)914{915 LCS_DBF_TEXT(2, trace, "statcb");916 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);917}918 919static int920lcs_send_lanstat(struct lcs_card *card)921{922 struct lcs_buffer *buffer;923 struct lcs_cmd *cmd;924 925 LCS_DBF_TEXT(2,trace, "cmdstat");926 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);927 cmd = (struct lcs_cmd *) buffer->data;928 /* Setup lanstat command. */929 cmd->cmd_code = LCS_CMD_LANSTAT;930 cmd->initiator = LCS_INITIATOR_TCPIP;931 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;932 cmd->cmd.lcs_std_cmd.portno = card->portno;933 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);934}935 936/*937 * send stoplan command938 */939static int940lcs_send_stoplan(struct lcs_card *card, __u8 initiator)941{942 struct lcs_buffer *buffer;943 struct lcs_cmd *cmd;944 945 LCS_DBF_TEXT(2, trace, "cmdstpln");946 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);947 cmd = (struct lcs_cmd *) buffer->data;948 cmd->cmd_code = LCS_CMD_STOPLAN;949 cmd->initiator = initiator;950 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;951 cmd->cmd.lcs_std_cmd.portno = card->portno;952 return lcs_send_lancmd(card, buffer, NULL);953}954 955/*956 * send startlan command957 */958static void959__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)960{961 LCS_DBF_TEXT(2, trace, "srtlancb");962 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;963 card->portno = cmd->cmd.lcs_std_cmd.portno;964}965 966static int967lcs_send_startlan(struct lcs_card *card, __u8 initiator)968{969 struct lcs_buffer *buffer;970 struct lcs_cmd *cmd;971 972 LCS_DBF_TEXT(2, trace, "cmdstaln");973 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);974 cmd = (struct lcs_cmd *) buffer->data;975 cmd->cmd_code = LCS_CMD_STARTLAN;976 cmd->initiator = initiator;977 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;978 cmd->cmd.lcs_std_cmd.portno = card->portno;979 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);980}981 982#ifdef CONFIG_IP_MULTICAST983/*984 * send setipm command (Multicast)985 */986static int987lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)988{989 struct lcs_buffer *buffer;990 struct lcs_cmd *cmd;991 992 LCS_DBF_TEXT(2, trace, "cmdsetim");993 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);994 cmd = (struct lcs_cmd *) buffer->data;995 cmd->cmd_code = LCS_CMD_SETIPM;996 cmd->initiator = LCS_INITIATOR_TCPIP;997 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;998 cmd->cmd.lcs_qipassist.portno = card->portno;999 cmd->cmd.lcs_qipassist.version = 4;1000 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;1001 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,1002 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));1003 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);1004 return lcs_send_lancmd(card, buffer, NULL);1005}1006 1007/*1008 * send delipm command (Multicast)1009 */1010static int1011lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)1012{1013 struct lcs_buffer *buffer;1014 struct lcs_cmd *cmd;1015 1016 LCS_DBF_TEXT(2, trace, "cmddelim");1017 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);1018 cmd = (struct lcs_cmd *) buffer->data;1019 cmd->cmd_code = LCS_CMD_DELIPM;1020 cmd->initiator = LCS_INITIATOR_TCPIP;1021 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;1022 cmd->cmd.lcs_qipassist.portno = card->portno;1023 cmd->cmd.lcs_qipassist.version = 4;1024 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;1025 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,1026 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));1027 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);1028 return lcs_send_lancmd(card, buffer, NULL);1029}1030 1031/*1032 * check if multicast is supported by LCS1033 */1034static void1035__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)1036{1037 LCS_DBF_TEXT(2, trace, "chkmccb");1038 card->ip_assists_supported =1039 cmd->cmd.lcs_qipassist.ip_assists_supported;1040 card->ip_assists_enabled =1041 cmd->cmd.lcs_qipassist.ip_assists_enabled;1042}1043 1044static int1045lcs_check_multicast_support(struct lcs_card *card)1046{1047 struct lcs_buffer *buffer;1048 struct lcs_cmd *cmd;1049 int rc;1050 1051 LCS_DBF_TEXT(2, trace, "cmdqipa");1052 /* Send query ipassist. */1053 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);1054 cmd = (struct lcs_cmd *) buffer->data;1055 cmd->cmd_code = LCS_CMD_QIPASSIST;1056 cmd->initiator = LCS_INITIATOR_TCPIP;1057 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;1058 cmd->cmd.lcs_qipassist.portno = card->portno;1059 cmd->cmd.lcs_qipassist.version = 4;1060 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;1061 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);1062 if (rc != 0) {1063 pr_err("Query IPAssist failed. Assuming unsupported!\n");1064 return -EOPNOTSUPP;1065 }1066 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)1067 return 0;1068 return -EOPNOTSUPP;1069}1070 1071/*1072 * set or del multicast address on LCS card1073 */1074static void1075lcs_fix_multicast_list(struct lcs_card *card)1076{1077 struct list_head failed_list;1078 struct lcs_ipm_list *ipm, *tmp;1079 unsigned long flags;1080 int rc;1081 1082 LCS_DBF_TEXT(4,trace, "fixipm");1083 INIT_LIST_HEAD(&failed_list);1084 spin_lock_irqsave(&card->ipm_lock, flags);1085list_modified:1086 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){1087 switch (ipm->ipm_state) {1088 case LCS_IPM_STATE_SET_REQUIRED:1089 /* del from ipm_list so no one else can tamper with1090 * this entry */1091 list_del_init(&ipm->list);1092 spin_unlock_irqrestore(&card->ipm_lock, flags);1093 rc = lcs_send_setipm(card, ipm);1094 spin_lock_irqsave(&card->ipm_lock, flags);1095 if (rc) {1096 pr_info("Adding multicast address failed."1097 " Table possibly full!\n");1098 /* store ipm in failed list -> will be added1099 * to ipm_list again, so a retry will be done1100 * during the next call of this function */1101 list_add_tail(&ipm->list, &failed_list);1102 } else {1103 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;1104 /* re-insert into ipm_list */1105 list_add_tail(&ipm->list, &card->ipm_list);1106 }1107 goto list_modified;1108 case LCS_IPM_STATE_DEL_REQUIRED:1109 list_del(&ipm->list);1110 spin_unlock_irqrestore(&card->ipm_lock, flags);1111 lcs_send_delipm(card, ipm);1112 spin_lock_irqsave(&card->ipm_lock, flags);1113 kfree(ipm);1114 goto list_modified;1115 case LCS_IPM_STATE_ON_CARD:1116 break;1117 }1118 }1119 /* re-insert all entries from the failed_list into ipm_list */1120 list_for_each_entry_safe(ipm, tmp, &failed_list, list)1121 list_move_tail(&ipm->list, &card->ipm_list);1122 1123 spin_unlock_irqrestore(&card->ipm_lock, flags);1124}1125 1126/*1127 * get mac address for the relevant Multicast address1128 */1129static void1130lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)1131{1132 LCS_DBF_TEXT(4,trace, "getmac");1133 ip_eth_mc_map(ipm, mac);1134}1135 1136/*1137 * function called by net device to handle multicast address relevant things1138 */1139static void lcs_remove_mc_addresses(struct lcs_card *card,1140 struct in_device *in4_dev)1141{1142 struct ip_mc_list *im4;1143 struct list_head *l;1144 struct lcs_ipm_list *ipm;1145 unsigned long flags;1146 char buf[MAX_ADDR_LEN];1147 1148 LCS_DBF_TEXT(4, trace, "remmclst");1149 spin_lock_irqsave(&card->ipm_lock, flags);1150 list_for_each(l, &card->ipm_list) {1151 ipm = list_entry(l, struct lcs_ipm_list, list);1152 for (im4 = rcu_dereference(in4_dev->mc_list);1153 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {1154 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);1155 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&1156 (memcmp(buf, &ipm->ipm.mac_addr,1157 LCS_MAC_LENGTH) == 0) )1158 break;1159 }1160 if (im4 == NULL)1161 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;1162 }1163 spin_unlock_irqrestore(&card->ipm_lock, flags);1164}1165 1166static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,1167 struct ip_mc_list *im4,1168 char *buf)1169{1170 struct lcs_ipm_list *tmp, *ipm = NULL;1171 struct list_head *l;1172 unsigned long flags;1173 1174 LCS_DBF_TEXT(4, trace, "chkmcent");1175 spin_lock_irqsave(&card->ipm_lock, flags);1176 list_for_each(l, &card->ipm_list) {1177 tmp = list_entry(l, struct lcs_ipm_list, list);1178 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&1179 (memcmp(buf, &tmp->ipm.mac_addr,1180 LCS_MAC_LENGTH) == 0) ) {1181 ipm = tmp;1182 break;1183 }1184 }1185 spin_unlock_irqrestore(&card->ipm_lock, flags);1186 return ipm;1187}1188 1189static void lcs_set_mc_addresses(struct lcs_card *card,1190 struct in_device *in4_dev)1191{1192 1193 struct ip_mc_list *im4;1194 struct lcs_ipm_list *ipm;1195 char buf[MAX_ADDR_LEN];1196 unsigned long flags;1197 1198 LCS_DBF_TEXT(4, trace, "setmclst");1199 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;1200 im4 = rcu_dereference(im4->next_rcu)) {1201 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);1202 ipm = lcs_check_addr_entry(card, im4, buf);1203 if (ipm != NULL)1204 continue; /* Address already in list. */1205 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);1206 if (ipm == NULL) {1207 pr_info("Not enough memory to add"1208 " new multicast entry!\n");1209 break;1210 }1211 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);1212 ipm->ipm.ip_addr = im4->multiaddr;1213 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;1214 spin_lock_irqsave(&card->ipm_lock, flags);1215 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);1216 list_add(&ipm->list, &card->ipm_list);1217 spin_unlock_irqrestore(&card->ipm_lock, flags);1218 }1219}1220 1221static int1222lcs_register_mc_addresses(void *data)1223{1224 struct lcs_card *card;1225 struct in_device *in4_dev;1226 1227 card = (struct lcs_card *) data;1228 1229 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))1230 return 0;1231 LCS_DBF_TEXT(4, trace, "regmulti");1232 1233 in4_dev = in_dev_get(card->dev);1234 if (in4_dev == NULL)1235 goto out;1236 rcu_read_lock();1237 lcs_remove_mc_addresses(card,in4_dev);1238 lcs_set_mc_addresses(card, in4_dev);1239 rcu_read_unlock();1240 in_dev_put(in4_dev);1241 1242 netif_carrier_off(card->dev);1243 netif_tx_disable(card->dev);1244 wait_event(card->write.wait_q,1245 (card->write.state != LCS_CH_STATE_RUNNING));1246 lcs_fix_multicast_list(card);1247 if (card->state == DEV_STATE_UP) {1248 netif_carrier_on(card->dev);1249 netif_wake_queue(card->dev);1250 }1251out:1252 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);1253 return 0;1254}1255#endif /* CONFIG_IP_MULTICAST */1256 1257/*1258 * function called by net device to1259 * handle multicast address relevant things1260 */1261static void1262lcs_set_multicast_list(struct net_device *dev)1263{1264#ifdef CONFIG_IP_MULTICAST1265 struct lcs_card *card;1266 1267 LCS_DBF_TEXT(4, trace, "setmulti");1268 card = (struct lcs_card *) dev->ml_priv;1269 1270 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))1271 schedule_work(&card->kernel_thread_starter);1272#endif /* CONFIG_IP_MULTICAST */1273}1274 1275static long1276lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)1277{1278 if (!IS_ERR(irb))1279 return 0;1280 1281 switch (PTR_ERR(irb)) {1282 case -EIO:1283 dev_warn(&cdev->dev,1284 "An I/O-error occurred on the LCS device\n");1285 LCS_DBF_TEXT(2, trace, "ckirberr");1286 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);1287 break;1288 case -ETIMEDOUT:1289 dev_warn(&cdev->dev,1290 "A command timed out on the LCS device\n");1291 LCS_DBF_TEXT(2, trace, "ckirberr");1292 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);1293 break;1294 default:1295 dev_warn(&cdev->dev,1296 "An error occurred on the LCS device, rc=%ld\n",1297 PTR_ERR(irb));1298 LCS_DBF_TEXT(2, trace, "ckirberr");1299 LCS_DBF_TEXT(2, trace, " rc???");1300 }1301 return PTR_ERR(irb);1302}1303 1304static int1305lcs_get_problem(struct ccw_device *cdev, struct irb *irb)1306{1307 int dstat, cstat;1308 char *sense;1309 1310 sense = (char *) irb->ecw;1311 cstat = irb->scsw.cmd.cstat;1312 dstat = irb->scsw.cmd.dstat;1313 1314 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |1315 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |1316 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {1317 LCS_DBF_TEXT(2, trace, "CGENCHK");1318 return 1;1319 }1320 if (dstat & DEV_STAT_UNIT_CHECK) {1321 if (sense[LCS_SENSE_BYTE_1] &1322 LCS_SENSE_RESETTING_EVENT) {1323 LCS_DBF_TEXT(2, trace, "REVIND");1324 return 1;1325 }1326 if (sense[LCS_SENSE_BYTE_0] &1327 LCS_SENSE_CMD_REJECT) {1328 LCS_DBF_TEXT(2, trace, "CMDREJ");1329 return 0;1330 }1331 if ((!sense[LCS_SENSE_BYTE_0]) &&1332 (!sense[LCS_SENSE_BYTE_1]) &&1333 (!sense[LCS_SENSE_BYTE_2]) &&1334 (!sense[LCS_SENSE_BYTE_3])) {1335 LCS_DBF_TEXT(2, trace, "ZEROSEN");1336 return 0;1337 }1338 LCS_DBF_TEXT(2, trace, "DGENCHK");1339 return 1;1340 }1341 return 0;1342}1343 1344static void1345lcs_schedule_recovery(struct lcs_card *card)1346{1347 LCS_DBF_TEXT(2, trace, "startrec");1348 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))1349 schedule_work(&card->kernel_thread_starter);1350}1351 1352/*1353 * IRQ Handler for LCS channels1354 */1355static void1356lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)1357{1358 struct lcs_card *card;1359 struct lcs_channel *channel;1360 int rc, index;1361 int cstat, dstat;1362 1363 if (lcs_check_irb_error(cdev, irb))1364 return;1365 1366 card = CARD_FROM_DEV(cdev);1367 if (card->read.ccwdev == cdev)1368 channel = &card->read;1369 else1370 channel = &card->write;1371 1372 cstat = irb->scsw.cmd.cstat;1373 dstat = irb->scsw.cmd.dstat;1374 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));1375 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,1376 irb->scsw.cmd.dstat);1377 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,1378 irb->scsw.cmd.actl);1379 1380 /* Check for channel and device errors presented */1381 rc = lcs_get_problem(cdev, irb);1382 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {1383 dev_warn(&cdev->dev,1384 "The LCS device stopped because of an error,"1385 " dstat=0x%X, cstat=0x%X \n",1386 dstat, cstat);1387 if (rc) {1388 channel->state = LCS_CH_STATE_ERROR;1389 }1390 }1391 if (channel->state == LCS_CH_STATE_ERROR) {1392 lcs_schedule_recovery(card);1393 wake_up(&card->wait_q);1394 return;1395 }1396 /* How far in the ccw chain have we processed? */1397 if ((channel->state != LCS_CH_STATE_INIT) &&1398 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&1399 (irb->scsw.cmd.cpa != 0)) {1400 index = (struct ccw1 *)dma32_to_virt(irb->scsw.cmd.cpa)1401 - channel->ccws;1402 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||1403 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))1404 /* Bloody io subsystem tells us lies about cpa... */1405 index = (index - 1) & (LCS_NUM_BUFFS - 1);1406 while (channel->io_idx != index) {1407 __lcs_processed_buffer(channel,1408 channel->iob + channel->io_idx);1409 channel->io_idx =1410 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);1411 }1412 }1413 1414 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||1415 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||1416 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))1417 /* Mark channel as stopped. */1418 channel->state = LCS_CH_STATE_STOPPED;1419 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)1420 /* CCW execution stopped on a suspend bit. */1421 channel->state = LCS_CH_STATE_SUSPENDED;1422 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {1423 if (irb->scsw.cmd.cc != 0) {1424 ccw_device_halt(channel->ccwdev, 0);1425 return;1426 }1427 /* The channel has been stopped by halt_IO. */1428 channel->state = LCS_CH_STATE_HALTED;1429 }1430 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)1431 channel->state = LCS_CH_STATE_CLEARED;1432 /* Do the rest in the tasklet. */1433 tasklet_schedule(&channel->irq_tasklet);1434}1435 1436/*1437 * Tasklet for IRQ handler1438 */1439static void1440lcs_tasklet(unsigned long data)1441{1442 unsigned long flags;1443 struct lcs_channel *channel;1444 struct lcs_buffer *iob;1445 int buf_idx;1446 1447 channel = (struct lcs_channel *) data;1448 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));1449 1450 /* Check for processed buffers. */1451 iob = channel->iob;1452 buf_idx = channel->buf_idx;1453 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {1454 /* Do the callback thing. */1455 if (iob[buf_idx].callback != NULL)1456 iob[buf_idx].callback(channel, iob + buf_idx);1457 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);1458 }1459 channel->buf_idx = buf_idx;1460 1461 if (channel->state == LCS_CH_STATE_STOPPED)1462 lcs_start_channel(channel);1463 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);1464 if (channel->state == LCS_CH_STATE_SUSPENDED &&1465 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)1466 __lcs_resume_channel(channel);1467 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);1468 1469 /* Something happened on the channel. Wake up waiters. */1470 wake_up(&channel->wait_q);1471}1472 1473/*1474 * Finish current tx buffer and make it ready for transmit.1475 */1476static void1477__lcs_emit_txbuffer(struct lcs_card *card)1478{1479 LCS_DBF_TEXT(5, trace, "emittx");1480 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;1481 card->tx_buffer->count += 2;1482 lcs_ready_buffer(&card->write, card->tx_buffer);1483 card->tx_buffer = NULL;1484 card->tx_emitted++;1485}1486 1487/*1488 * Callback for finished tx buffers.1489 */1490static void1491lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)1492{1493 struct lcs_card *card;1494 1495 LCS_DBF_TEXT(5, trace, "txbuffcb");1496 /* Put buffer back to pool. */1497 lcs_release_buffer(channel, buffer);1498 card = container_of(channel, struct lcs_card, write);1499 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))1500 netif_wake_queue(card->dev);1501 spin_lock(&card->lock);1502 card->tx_emitted--;1503 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)1504 /*1505 * Last running tx buffer has finished. Submit partially1506 * filled current buffer.1507 */1508 __lcs_emit_txbuffer(card);1509 spin_unlock(&card->lock);1510}1511 1512/*1513 * Packet transmit function called by network stack1514 */1515static netdev_tx_t __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,1516 struct net_device *dev)1517{1518 struct lcs_header *header;1519 int rc = NETDEV_TX_OK;1520 1521 LCS_DBF_TEXT(5, trace, "hardxmit");1522 if (skb == NULL) {1523 card->stats.tx_dropped++;1524 card->stats.tx_errors++;1525 return NETDEV_TX_OK;1526 }1527 if (card->state != DEV_STATE_UP) {1528 dev_kfree_skb(skb);1529 card->stats.tx_dropped++;1530 card->stats.tx_errors++;1531 card->stats.tx_carrier_errors++;1532 return NETDEV_TX_OK;1533 }1534 if (skb->protocol == htons(ETH_P_IPV6)) {1535 dev_kfree_skb(skb);1536 return NETDEV_TX_OK;1537 }1538 netif_stop_queue(card->dev);1539 spin_lock(&card->lock);1540 if (card->tx_buffer != NULL &&1541 card->tx_buffer->count + sizeof(struct lcs_header) +1542 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)1543 /* skb too big for current tx buffer. */1544 __lcs_emit_txbuffer(card);1545 if (card->tx_buffer == NULL) {1546 /* Get new tx buffer */1547 card->tx_buffer = lcs_get_buffer(&card->write);1548 if (card->tx_buffer == NULL) {1549 card->stats.tx_dropped++;1550 rc = NETDEV_TX_BUSY;1551 goto out;1552 }1553 card->tx_buffer->callback = lcs_txbuffer_cb;1554 card->tx_buffer->count = 0;1555 }1556 header = (struct lcs_header *)1557 (card->tx_buffer->data + card->tx_buffer->count);1558 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);1559 header->offset = card->tx_buffer->count;1560 header->type = card->lan_type;1561 header->slot = card->portno;1562 skb_copy_from_linear_data(skb, header + 1, skb->len);1563 spin_unlock(&card->lock);1564 card->stats.tx_bytes += skb->len;1565 card->stats.tx_packets++;1566 dev_kfree_skb(skb);1567 netif_wake_queue(card->dev);1568 spin_lock(&card->lock);1569 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)1570 /* If this is the first tx buffer emit it immediately. */1571 __lcs_emit_txbuffer(card);1572out:1573 spin_unlock(&card->lock);1574 return rc;1575}1576 1577static netdev_tx_t lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)1578{1579 struct lcs_card *card;1580 int rc;1581 1582 LCS_DBF_TEXT(5, trace, "pktxmit");1583 card = (struct lcs_card *) dev->ml_priv;1584 rc = __lcs_start_xmit(card, skb, dev);1585 return rc;1586}1587 1588/*1589 * send startlan and lanstat command to make LCS device ready1590 */1591static int1592lcs_startlan_auto(struct lcs_card *card)1593{1594 int rc;1595 1596 LCS_DBF_TEXT(2, trace, "strtauto");1597 card->lan_type = LCS_FRAME_TYPE_ENET;1598 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);1599 if (rc == 0)1600 return 0;1601 1602 return -EIO;1603}1604 1605static int1606lcs_startlan(struct lcs_card *card)1607{1608 int rc, i;1609 1610 LCS_DBF_TEXT(2, trace, "startlan");1611 rc = 0;1612 if (card->portno != LCS_INVALID_PORT_NO) {1613 if (card->lan_type == LCS_FRAME_TYPE_AUTO)1614 rc = lcs_startlan_auto(card);1615 else1616 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);1617 } else {1618 for (i = 0; i <= 16; i++) {1619 card->portno = i;1620 if (card->lan_type != LCS_FRAME_TYPE_AUTO)1621 rc = lcs_send_startlan(card,1622 LCS_INITIATOR_TCPIP);1623 else1624 /* autodetecting lan type */1625 rc = lcs_startlan_auto(card);1626 if (rc == 0)1627 break;1628 }1629 }1630 if (rc == 0)1631 return lcs_send_lanstat(card);1632 return rc;1633}1634 1635/*1636 * LCS detect function1637 * setup channels and make them I/O ready1638 */1639static int1640lcs_detect(struct lcs_card *card)1641{1642 int rc = 0;1643 1644 LCS_DBF_TEXT(2, setup, "lcsdetct");1645 /* start/reset card */1646 if (card->dev)1647 netif_stop_queue(card->dev);1648 rc = lcs_stop_channels(card);1649 if (rc == 0) {1650 rc = lcs_start_channels(card);1651 if (rc == 0) {1652 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);1653 if (rc == 0)1654 rc = lcs_startlan(card);1655 }1656 }1657 if (rc == 0) {1658 card->state = DEV_STATE_UP;1659 } else {1660 card->state = DEV_STATE_DOWN;1661 card->write.state = LCS_CH_STATE_INIT;1662 card->read.state = LCS_CH_STATE_INIT;1663 }1664 return rc;1665}1666 1667/*1668 * LCS Stop card1669 */1670static int1671lcs_stopcard(struct lcs_card *card)1672{1673 int rc;1674 1675 LCS_DBF_TEXT(3, setup, "stopcard");1676 1677 if (card->read.state != LCS_CH_STATE_STOPPED &&1678 card->write.state != LCS_CH_STATE_STOPPED &&1679 card->read.state != LCS_CH_STATE_ERROR &&1680 card->write.state != LCS_CH_STATE_ERROR &&1681 card->state == DEV_STATE_UP) {1682 lcs_clear_multicast_list(card);1683 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);1684 rc = lcs_send_shutdown(card);1685 }1686 rc = lcs_stop_channels(card);1687 card->state = DEV_STATE_DOWN;1688 1689 return rc;1690}1691 1692/*1693 * Kernel Thread helper functions for LGW initiated commands1694 */1695static void1696lcs_start_kernel_thread(struct work_struct *work)1697{1698 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);1699 LCS_DBF_TEXT(5, trace, "krnthrd");1700 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))1701 kthread_run(lcs_recovery, card, "lcs_recover");1702#ifdef CONFIG_IP_MULTICAST1703 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))1704 kthread_run(lcs_register_mc_addresses, card, "regipm");1705#endif1706}1707 1708/*1709 * Process control frames.1710 */1711static void1712lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)1713{1714 LCS_DBF_TEXT(5, trace, "getctrl");1715 if (cmd->initiator == LCS_INITIATOR_LGW) {1716 switch(cmd->cmd_code) {1717 case LCS_CMD_STARTUP:1718 case LCS_CMD_STARTLAN:1719 lcs_schedule_recovery(card);1720 break;1721 case LCS_CMD_STOPLAN:1722 if (card->dev) {1723 pr_warn("Stoplan for %s initiated by LGW\n",1724 card->dev->name);1725 netif_carrier_off(card->dev);1726 }1727 break;1728 default:1729 LCS_DBF_TEXT(5, trace, "noLGWcmd");1730 break;1731 }1732 } else1733 lcs_notify_lancmd_waiters(card, cmd);1734}1735 1736/*1737 * Unpack network packet.1738 */1739static void1740lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)1741{1742 struct sk_buff *skb;1743 1744 LCS_DBF_TEXT(5, trace, "getskb");1745 if (card->dev == NULL ||1746 card->state != DEV_STATE_UP)1747 /* The card isn't up. Ignore the packet. */1748 return;1749 1750 skb = dev_alloc_skb(skb_len);1751 if (skb == NULL) {1752 dev_err(&card->dev->dev,1753 " Allocating a socket buffer to interface %s failed\n",1754 card->dev->name);1755 card->stats.rx_dropped++;1756 return;1757 }1758 skb_put_data(skb, skb_data, skb_len);1759 skb->protocol = card->lan_type_trans(skb, card->dev);1760 card->stats.rx_bytes += skb_len;1761 card->stats.rx_packets++;1762 if (skb->protocol == htons(ETH_P_802_2))1763 *((__u32 *)skb->cb) = ++card->pkt_seq;1764 netif_rx(skb);1765}1766 1767/*1768 * LCS main routine to get packets and lancmd replies from the buffers1769 */1770static void1771lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)1772{1773 struct lcs_card *card;1774 struct lcs_header *lcs_hdr;1775 __u16 offset;1776 1777 LCS_DBF_TEXT(5, trace, "lcsgtpkt");1778 lcs_hdr = (struct lcs_header *) buffer->data;1779 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {1780 LCS_DBF_TEXT(4, trace, "-eiogpkt");1781 return;1782 }1783 card = container_of(channel, struct lcs_card, read);1784 offset = 0;1785 while (lcs_hdr->offset != 0) {1786 if (lcs_hdr->offset <= 0 ||1787 lcs_hdr->offset > LCS_IOBUFFERSIZE ||1788 lcs_hdr->offset < offset) {1789 /* Offset invalid. */1790 card->stats.rx_length_errors++;1791 card->stats.rx_errors++;1792 return;1793 }1794 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)1795 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);1796 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET)1797 lcs_get_skb(card, (char *)(lcs_hdr + 1),1798 lcs_hdr->offset - offset -1799 sizeof(struct lcs_header));1800 else1801 dev_info_once(&card->dev->dev,1802 "Unknown frame type %d\n",1803 lcs_hdr->type);1804 offset = lcs_hdr->offset;1805 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;1806 lcs_hdr = (struct lcs_header *) (buffer->data + offset);1807 }1808 /* The buffer is now empty. Make it ready again. */1809 lcs_ready_buffer(&card->read, buffer);1810}1811 1812/*1813 * get network statistics for ifconfig and other user programs1814 */1815static struct net_device_stats *1816lcs_getstats(struct net_device *dev)1817{1818 struct lcs_card *card;1819 1820 LCS_DBF_TEXT(4, trace, "netstats");1821 card = (struct lcs_card *) dev->ml_priv;1822 return &card->stats;1823}1824 1825/*1826 * stop lcs device1827 * This function will be called by user doing ifconfig xxx down1828 */1829static int1830lcs_stop_device(struct net_device *dev)1831{1832 struct lcs_card *card;1833 int rc;1834 1835 LCS_DBF_TEXT(2, trace, "stopdev");1836 card = (struct lcs_card *) dev->ml_priv;1837 netif_carrier_off(dev);1838 netif_tx_disable(dev);1839 dev->flags &= ~IFF_UP;1840 wait_event(card->write.wait_q,1841 (card->write.state != LCS_CH_STATE_RUNNING));1842 rc = lcs_stopcard(card);1843 if (rc)1844 dev_err(&card->dev->dev,1845 " Shutting down the LCS device failed\n");1846 return rc;1847}1848 1849/*1850 * start lcs device and make it runnable1851 * This function will be called by user doing ifconfig xxx up1852 */1853static int1854lcs_open_device(struct net_device *dev)1855{1856 struct lcs_card *card;1857 int rc;1858 1859 LCS_DBF_TEXT(2, trace, "opendev");1860 card = (struct lcs_card *) dev->ml_priv;1861 /* initialize statistics */1862 rc = lcs_detect(card);1863 if (rc) {1864 pr_err("Error in opening device!\n");1865 1866 } else {1867 dev->flags |= IFF_UP;1868 netif_carrier_on(dev);1869 netif_wake_queue(dev);1870 card->state = DEV_STATE_UP;1871 }1872 return rc;1873}1874 1875/*1876 * show function for portno called by cat or similar things1877 */1878static ssize_t1879lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)1880{1881 struct lcs_card *card;1882 1883 card = dev_get_drvdata(dev);1884 1885 if (!card)1886 return 0;1887 1888 return sysfs_emit(buf, "%d\n", card->portno);1889}1890 1891/*1892 * store the value which is piped to file portno1893 */1894static ssize_t1895lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)1896{1897 struct lcs_card *card;1898 int rc;1899 s16 value;1900 1901 card = dev_get_drvdata(dev);1902 1903 if (!card)1904 return 0;1905 1906 rc = kstrtos16(buf, 0, &value);1907 if (rc)1908 return -EINVAL;1909 /* TODO: sanity checks */1910 card->portno = value;1911 if (card->dev)1912 card->dev->dev_port = card->portno;1913 1914 return count;1915 1916}1917 1918static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);1919 1920static const char *lcs_type[] = {1921 "not a channel",1922 "2216 parallel",1923 "2216 channel",1924 "OSA LCS card",1925 "unknown channel type",1926 "unsupported channel type",1927};1928 1929static ssize_t1930lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)1931{1932 struct ccwgroup_device *cgdev;1933 1934 cgdev = to_ccwgroupdev(dev);1935 if (!cgdev)1936 return -ENODEV;1937 1938 return sysfs_emit(buf, "%s\n",1939 lcs_type[cgdev->cdev[0]->id.driver_info]);1940}1941 1942static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);1943 1944static ssize_t1945lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)1946{1947 struct lcs_card *card;1948 1949 card = dev_get_drvdata(dev);1950 1951 return card ? sysfs_emit(buf, "%u\n", card->lancmd_timeout) : 0;1952}1953 1954static ssize_t1955lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)1956{1957 struct lcs_card *card;1958 unsigned int value;1959 int rc;1960 1961 card = dev_get_drvdata(dev);1962 1963 if (!card)1964 return 0;1965 1966 rc = kstrtouint(buf, 0, &value);1967 if (rc)1968 return -EINVAL;1969 /* TODO: sanity checks */1970 card->lancmd_timeout = value;1971 1972 return count;1973 1974}1975 1976static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);1977 1978static ssize_t1979lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,1980 const char *buf, size_t count)1981{1982 struct lcs_card *card = dev_get_drvdata(dev);1983 char *tmp;1984 int i;1985 1986 if (!card)1987 return -EINVAL;1988 if (card->state != DEV_STATE_UP)1989 return -EPERM;1990 i = simple_strtoul(buf, &tmp, 16);1991 if (i == 1)1992 lcs_schedule_recovery(card);1993 return count;1994}1995 1996static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);1997 1998static struct attribute * lcs_attrs[] = {1999 &dev_attr_portno.attr,2000 &dev_attr_type.attr,2001 &dev_attr_lancmd_timeout.attr,2002 &dev_attr_recover.attr,2003 NULL,2004};2005static struct attribute_group lcs_attr_group = {2006 .attrs = lcs_attrs,2007};2008static const struct attribute_group *lcs_attr_groups[] = {2009 &lcs_attr_group,2010 NULL,2011};2012static const struct device_type lcs_devtype = {2013 .name = "lcs",2014 .groups = lcs_attr_groups,2015};2016 2017/*2018 * lcs_probe_device is called on establishing a new ccwgroup_device.2019 */2020static int2021lcs_probe_device(struct ccwgroup_device *ccwgdev)2022{2023 struct lcs_card *card;2024 2025 if (!get_device(&ccwgdev->dev))2026 return -ENODEV;2027 2028 LCS_DBF_TEXT(2, setup, "add_dev");2029 card = lcs_alloc_card();2030 if (!card) {2031 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);2032 put_device(&ccwgdev->dev);2033 return -ENOMEM;2034 }2035 dev_set_drvdata(&ccwgdev->dev, card);2036 ccwgdev->cdev[0]->handler = lcs_irq;2037 ccwgdev->cdev[1]->handler = lcs_irq;2038 card->gdev = ccwgdev;2039 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);2040 card->thread_start_mask = 0;2041 card->thread_allowed_mask = 0;2042 card->thread_running_mask = 0;2043 ccwgdev->dev.type = &lcs_devtype;2044 2045 return 0;2046}2047 2048static int2049lcs_register_netdev(struct ccwgroup_device *ccwgdev)2050{2051 struct lcs_card *card;2052 2053 LCS_DBF_TEXT(2, setup, "regnetdv");2054 card = dev_get_drvdata(&ccwgdev->dev);2055 if (card->dev->reg_state != NETREG_UNINITIALIZED)2056 return 0;2057 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);2058 return register_netdev(card->dev);2059}2060 2061/*2062 * lcs_new_device will be called by setting the group device online.2063 */2064static const struct net_device_ops lcs_netdev_ops = {2065 .ndo_open = lcs_open_device,2066 .ndo_stop = lcs_stop_device,2067 .ndo_get_stats = lcs_getstats,2068 .ndo_start_xmit = lcs_start_xmit,2069};2070 2071static const struct net_device_ops lcs_mc_netdev_ops = {2072 .ndo_open = lcs_open_device,2073 .ndo_stop = lcs_stop_device,2074 .ndo_get_stats = lcs_getstats,2075 .ndo_start_xmit = lcs_start_xmit,2076 .ndo_set_rx_mode = lcs_set_multicast_list,2077};2078 2079static int2080lcs_new_device(struct ccwgroup_device *ccwgdev)2081{2082 struct lcs_card *card;2083 struct net_device *dev=NULL;2084 enum lcs_dev_states recover_state;2085 int rc;2086 2087 card = dev_get_drvdata(&ccwgdev->dev);2088 if (!card)2089 return -ENODEV;2090 2091 LCS_DBF_TEXT(2, setup, "newdev");2092 LCS_DBF_HEX(3, setup, &card, sizeof(void*));2093 card->read.ccwdev = ccwgdev->cdev[0];2094 card->write.ccwdev = ccwgdev->cdev[1];2095 2096 recover_state = card->state;2097 rc = ccw_device_set_online(card->read.ccwdev);2098 if (rc)2099 goto out_err;2100 rc = ccw_device_set_online(card->write.ccwdev);2101 if (rc)2102 goto out_werr;2103 2104 LCS_DBF_TEXT(3, setup, "lcsnewdv");2105 2106 lcs_setup_card(card);2107 rc = lcs_detect(card);2108 if (rc) {2109 LCS_DBF_TEXT(2, setup, "dtctfail");2110 dev_err(&ccwgdev->dev,2111 "Detecting a network adapter for LCS devices"2112 " failed with rc=%d (0x%x)\n", rc, rc);2113 lcs_stopcard(card);2114 goto out;2115 }2116 if (card->dev) {2117 LCS_DBF_TEXT(2, setup, "samedev");2118 LCS_DBF_HEX(3, setup, &card, sizeof(void*));2119 goto netdev_out;2120 }2121 switch (card->lan_type) {2122 case LCS_FRAME_TYPE_ENET:2123 card->lan_type_trans = eth_type_trans;2124 dev = alloc_etherdev(0);2125 break;2126 default:2127 LCS_DBF_TEXT(3, setup, "errinit");2128 pr_err(" Initialization failed\n");2129 goto out;2130 }2131 if (!dev)2132 goto out;2133 card->dev = dev;2134 card->dev->ml_priv = card;2135 card->dev->netdev_ops = &lcs_netdev_ops;2136 card->dev->dev_port = card->portno;2137 eth_hw_addr_set(card->dev, card->mac);2138#ifdef CONFIG_IP_MULTICAST2139 if (!lcs_check_multicast_support(card))2140 card->dev->netdev_ops = &lcs_mc_netdev_ops;2141#endif2142netdev_out:2143 lcs_set_allowed_threads(card,0xffffffff);2144 if (recover_state == DEV_STATE_RECOVER) {2145 lcs_set_multicast_list(card->dev);2146 card->dev->flags |= IFF_UP;2147 netif_carrier_on(card->dev);2148 netif_wake_queue(card->dev);2149 card->state = DEV_STATE_UP;2150 } else {2151 lcs_stopcard(card);2152 }2153 2154 if (lcs_register_netdev(ccwgdev) != 0)2155 goto out;2156 2157 /* Print out supported assists: IPv6 */2158 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,2159 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?2160 "with" : "without");2161 /* Print out supported assist: Multicast */2162 pr_info("LCS device %s %s Multicast support\n", card->dev->name,2163 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?2164 "with" : "without");2165 return 0;2166out:2167 2168 ccw_device_set_offline(card->write.ccwdev);2169out_werr:2170 ccw_device_set_offline(card->read.ccwdev);2171out_err:2172 return -ENODEV;2173}2174 2175/*2176 * lcs_shutdown_device, called when setting the group device offline.2177 */2178static int2179__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)2180{2181 struct lcs_card *card;2182 enum lcs_dev_states recover_state;2183 int ret = 0, ret2 = 0, ret3 = 0;2184 2185 LCS_DBF_TEXT(3, setup, "shtdndev");2186 card = dev_get_drvdata(&ccwgdev->dev);2187 if (!card)2188 return -ENODEV;2189 if (recovery_mode == 0) {2190 lcs_set_allowed_threads(card, 0);2191 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))2192 return -ERESTARTSYS;2193 }2194 LCS_DBF_HEX(3, setup, &card, sizeof(void*));2195 recover_state = card->state;2196 2197 ret = lcs_stop_device(card->dev);2198 ret2 = ccw_device_set_offline(card->read.ccwdev);2199 ret3 = ccw_device_set_offline(card->write.ccwdev);2200 if (!ret)2201 ret = (ret2) ? ret2 : ret3;2202 if (ret)2203 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);2204 if (recover_state == DEV_STATE_UP) {2205 card->state = DEV_STATE_RECOVER;2206 }2207 return 0;2208}2209 2210static int2211lcs_shutdown_device(struct ccwgroup_device *ccwgdev)2212{2213 return __lcs_shutdown_device(ccwgdev, 0);2214}2215 2216/*2217 * drive lcs recovery after startup and startlan initiated by Lan Gateway2218 */2219static int2220lcs_recovery(void *ptr)2221{2222 struct lcs_card *card;2223 struct ccwgroup_device *gdev;2224 int rc;2225 2226 card = (struct lcs_card *) ptr;2227 2228 LCS_DBF_TEXT(4, trace, "recover1");2229 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))2230 return 0;2231 LCS_DBF_TEXT(4, trace, "recover2");2232 gdev = card->gdev;2233 dev_warn(&gdev->dev,2234 "A recovery process has been started for the LCS device\n");2235 rc = __lcs_shutdown_device(gdev, 1);2236 rc = lcs_new_device(gdev);2237 if (!rc)2238 pr_info("Device %s successfully recovered!\n",2239 card->dev->name);2240 else2241 pr_info("Device %s could not be recovered!\n",2242 card->dev->name);2243 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);2244 return 0;2245}2246 2247/*2248 * lcs_remove_device, free buffers and card2249 */2250static void2251lcs_remove_device(struct ccwgroup_device *ccwgdev)2252{2253 struct lcs_card *card;2254 2255 card = dev_get_drvdata(&ccwgdev->dev);2256 if (!card)2257 return;2258 2259 LCS_DBF_TEXT(3, setup, "remdev");2260 LCS_DBF_HEX(3, setup, &card, sizeof(void*));2261 if (ccwgdev->state == CCWGROUP_ONLINE) {2262 lcs_shutdown_device(ccwgdev);2263 }2264 if (card->dev)2265 unregister_netdev(card->dev);2266 lcs_cleanup_card(card);2267 lcs_free_card(card);2268 dev_set_drvdata(&ccwgdev->dev, NULL);2269 put_device(&ccwgdev->dev);2270}2271 2272static struct ccw_device_id lcs_ids[] = {2273 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},2274 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},2275 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},2276 {},2277};2278MODULE_DEVICE_TABLE(ccw, lcs_ids);2279 2280static struct ccw_driver lcs_ccw_driver = {2281 .driver = {2282 .owner = THIS_MODULE,2283 .name = "lcs",2284 },2285 .ids = lcs_ids,2286 .probe = ccwgroup_probe_ccwdev,2287 .remove = ccwgroup_remove_ccwdev,2288 .int_class = IRQIO_LCS,2289};2290 2291/*2292 * LCS ccwgroup driver registration2293 */2294static struct ccwgroup_driver lcs_group_driver = {2295 .driver = {2296 .owner = THIS_MODULE,2297 .name = "lcs",2298 },2299 .ccw_driver = &lcs_ccw_driver,2300 .setup = lcs_probe_device,2301 .remove = lcs_remove_device,2302 .set_online = lcs_new_device,2303 .set_offline = lcs_shutdown_device,2304};2305 2306static ssize_t group_store(struct device_driver *ddrv, const char *buf,2307 size_t count)2308{2309 int err;2310 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);2311 return err ? err : count;2312}2313static DRIVER_ATTR_WO(group);2314 2315static struct attribute *lcs_drv_attrs[] = {2316 &driver_attr_group.attr,2317 NULL,2318};2319static struct attribute_group lcs_drv_attr_group = {2320 .attrs = lcs_drv_attrs,2321};2322static const struct attribute_group *lcs_drv_attr_groups[] = {2323 &lcs_drv_attr_group,2324 NULL,2325};2326 2327/*2328 * LCS Module/Kernel initialization function2329 */2330static int2331__init lcs_init_module(void)2332{2333 int rc;2334 2335 pr_info("Loading %s\n", version);2336 rc = lcs_register_debug_facility();2337 LCS_DBF_TEXT(0, setup, "lcsinit");2338 if (rc)2339 goto out_err;2340 lcs_root_dev = root_device_register("lcs");2341 rc = PTR_ERR_OR_ZERO(lcs_root_dev);2342 if (rc)2343 goto register_err;2344 rc = ccw_driver_register(&lcs_ccw_driver);2345 if (rc)2346 goto ccw_err;2347 lcs_group_driver.driver.groups = lcs_drv_attr_groups;2348 rc = ccwgroup_driver_register(&lcs_group_driver);2349 if (rc)2350 goto ccwgroup_err;2351 return 0;2352 2353ccwgroup_err:2354 ccw_driver_unregister(&lcs_ccw_driver);2355ccw_err:2356 root_device_unregister(lcs_root_dev);2357register_err:2358 lcs_unregister_debug_facility();2359out_err:2360 pr_err("Initializing the lcs device driver failed\n");2361 return rc;2362}2363 2364 2365/*2366 * LCS module cleanup function2367 */2368static void2369__exit lcs_cleanup_module(void)2370{2371 pr_info("Terminating lcs module.\n");2372 LCS_DBF_TEXT(0, trace, "cleanup");2373 ccwgroup_driver_unregister(&lcs_group_driver);2374 ccw_driver_unregister(&lcs_ccw_driver);2375 root_device_unregister(lcs_root_dev);2376 lcs_unregister_debug_facility();2377}2378 2379module_init(lcs_init_module);2380module_exit(lcs_cleanup_module);2381 2382MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");2383MODULE_DESCRIPTION("S/390 LAN channel station device driver");2384MODULE_LICENSE("GPL");2385 2386