/* * Linux for S/390 Lan Channel Station Network Driver * * Copyright IBM Corp. 1999, 2009 * Author(s): Original Code written by * DJ Barrow * Rewritten by * Frank Pavlic and * Martin Schwidefsky * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "lcs.h" #include "cu3088.h" #if !defined(CONFIG_NET_ETHERNET) && \ !defined(CONFIG_TR) && !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"; static char debug_buffer[255]; /** * 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 debug_info_t *lcs_dbf_setup; static debug_info_t *lcs_dbf_trace; /** * LCS Debug Facility functions */ static void lcs_unregister_debug_facility(void) { if (lcs_dbf_setup) debug_unregister(lcs_dbf_setup); if (lcs_dbf_trace) 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 comand. */ 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(&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); 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 noone 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"); if (dev->type == ARPHRD_IEEE802_TR) ip_tr_mc_map(ipm, mac); else 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 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) { 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 = in4_dev->mc_list; im4; im4 = im4->next) { 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 = (struct lcs_ipm_list *) 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; read_lock(&in4_dev->mc_list_lock); lcs_remove_mc_addresses(card,in4_dev); lcs_set_mc_addresses(card, in4_dev); read_unlock(&in4_dev->mc_list_lock); 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; int rc; 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) // FIXME: what if rc != 0 ?? rc = 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) { // FIXME: what if rc != 0 ?? rc = __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 = 0; LCS_DBF_TEXT(5, trace, "hardxmit"); if (skb == NULL) { card->stats.tx_dropped++; card->stats.tx_errors++; return 0; } if (card->state != DEV_STATE_UP) { dev_kfree_skb(skb); card->stats.tx_dropped++; card->stats.tx_errors++; card->stats.tx_carrier_errors++; return 0; } if (skb->protocol == htons(ETH_P_IPV6)) { dev_kfree_skb(skb); return 0; } 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_NET_ETHERNET card->lan_type = LCS_FRAME_TYPE_ENET; rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP); if (rc == 0) return 0; #endif #ifdef CONFIG_TR card->lan_type = LCS_FRAME_TYPE_TR; 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 = (struct lcs_card *)dev->driver_data; 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 value; card = (struct lcs_card *)dev->driver_data; if (!card) return 0; sscanf(buf, "%u", &value); /* TODO: sanity checks */ card->portno = value; return count; } static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store); 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", cu3088_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 = (struct lcs_card *)dev->driver_data; 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; int value; card = (struct lcs_card *)dev->driver_data; if (!card) return 0; sscanf(buf, "%u", &value); /* 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->driver_data; 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, }; /** * lcs_probe_device is called on establishing a new ccwgroup_device. */ static int lcs_probe_device(struct ccwgroup_device *ccwgdev) { struct lcs_card *card; int ret; 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; } ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group); if (ret) { lcs_free_card(card); put_device(&ccwgdev->dev); return ret; } ccwgdev->dev.driver_data = 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; return 0; } static int lcs_register_netdev(struct ccwgroup_device *ccwgdev) { struct lcs_card *card; LCS_DBF_TEXT(2, setup, "regnetdv"); card = (struct lcs_card *)ccwgdev->dev.driver_data; 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_multicast_list = 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 = (struct lcs_card *)ccwgdev->dev.driver_data; 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; ccw_device_set_online(card->read.ccwdev); ccw_device_set_online(card->write.ccwdev); 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_NET_ETHERNET case LCS_FRAME_TYPE_ENET: card->lan_type_trans = eth_type_trans; dev = alloc_etherdev(0); break; #endif #ifdef CONFIG_TR case LCS_FRAME_TYPE_TR: card->lan_type_trans = tr_type_trans; dev = alloc_trdev(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->read.ccwdev); ccw_device_set_offline(card->write.ccwdev); 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; LCS_DBF_TEXT(3, setup, "shtdndev"); card = (struct lcs_card *)ccwgdev->dev.driver_data; 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); ret = ccw_device_set_offline(card->read.ccwdev); ret = ccw_device_set_offline(card->write.ccwdev); if (recover_state == DEV_STATE_UP) { card->state = DEV_STATE_RECOVER; } if (ret) return ret; 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 = (struct lcs_card *)ccwgdev->dev.driver_data; 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); sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group); lcs_cleanup_card(card); lcs_free_card(card); 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); } /** * LCS ccwgroup driver registration */ static struct ccwgroup_driver lcs_group_driver = { .owner = THIS_MODULE, .name = "lcs", .max_slaves = 2, .driver_id = 0xD3C3E2, .probe = 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, }; /** * 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) { pr_err("Initialization failed\n"); return rc; } rc = register_cu3088_discipline(&lcs_group_driver); if (rc) { pr_err("Initialization failed\n"); return rc; } return 0; } /** * LCS module cleanup function */ static void __exit lcs_cleanup_module(void) { pr_info("Terminating lcs module.\n"); LCS_DBF_TEXT(0, trace, "cleanup"); unregister_cu3088_discipline(&lcs_group_driver); lcs_unregister_debug_facility(); } module_init(lcs_init_module); module_exit(lcs_cleanup_module); MODULE_AUTHOR("Frank Pavlic "); MODULE_LICENSE("GPL");