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Diffstat (limited to 'drivers/s390/net/ctcm_main.c')
-rw-r--r--drivers/s390/net/ctcm_main.c1892
1 files changed, 1892 insertions, 0 deletions
diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
new file mode 100644
index 00000000000..5cb93a8e340
--- /dev/null
+++ b/drivers/s390/net/ctcm_main.c
@@ -0,0 +1,1892 @@
+/*
+ * drivers/s390/net/ctcm_main.c
+ *
+ * Copyright IBM Corp. 2001, 2009
+ * Author(s):
+ * Original CTC driver(s):
+ * Fritz Elfert (felfert@millenux.com)
+ * Dieter Wellerdiek (wel@de.ibm.com)
+ * Martin Schwidefsky (schwidefsky@de.ibm.com)
+ * Denis Joseph Barrow (barrow_dj@yahoo.com)
+ * Jochen Roehrig (roehrig@de.ibm.com)
+ * Cornelia Huck <cornelia.huck@de.ibm.com>
+ * MPC additions:
+ * Belinda Thompson (belindat@us.ibm.com)
+ * Andy Richter (richtera@us.ibm.com)
+ * Revived by:
+ * Peter Tiedemann (ptiedem@de.ibm.com)
+ */
+
+#undef DEBUG
+#undef DEBUGDATA
+#undef DEBUGCCW
+
+#define KMSG_COMPONENT "ctcm"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/bitops.h>
+
+#include <linux/signal.h>
+#include <linux/string.h>
+
+#include <linux/ip.h>
+#include <linux/if_arp.h>
+#include <linux/tcp.h>
+#include <linux/skbuff.h>
+#include <linux/ctype.h>
+#include <net/dst.h>
+
+#include <linux/io.h>
+#include <asm/ccwdev.h>
+#include <asm/ccwgroup.h>
+#include <linux/uaccess.h>
+
+#include <asm/idals.h>
+
+#include "ctcm_fsms.h"
+#include "ctcm_main.h"
+
+/* Some common global variables */
+
+/**
+ * The root device for ctcm group devices
+ */
+static struct device *ctcm_root_dev;
+
+/*
+ * Linked list of all detected channels.
+ */
+struct channel *channels;
+
+/**
+ * Unpack a just received skb and hand it over to
+ * upper layers.
+ *
+ * ch The channel where this skb has been received.
+ * pskb The received skb.
+ */
+void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
+{
+ struct net_device *dev = ch->netdev;
+ struct ctcm_priv *priv = dev->ml_priv;
+ __u16 len = *((__u16 *) pskb->data);
+
+ skb_put(pskb, 2 + LL_HEADER_LENGTH);
+ skb_pull(pskb, 2);
+ pskb->dev = dev;
+ pskb->ip_summed = CHECKSUM_UNNECESSARY;
+ while (len > 0) {
+ struct sk_buff *skb;
+ int skblen;
+ struct ll_header *header = (struct ll_header *)pskb->data;
+
+ skb_pull(pskb, LL_HEADER_LENGTH);
+ if ((ch->protocol == CTCM_PROTO_S390) &&
+ (header->type != ETH_P_IP)) {
+ if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
+ ch->logflags |= LOG_FLAG_ILLEGALPKT;
+ /*
+ * Check packet type only if we stick strictly
+ * to S/390's protocol of OS390. This only
+ * supports IP. Otherwise allow any packet
+ * type.
+ */
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): Illegal packet type 0x%04x"
+ " - dropping",
+ CTCM_FUNTAIL, dev->name, header->type);
+ }
+ priv->stats.rx_dropped++;
+ priv->stats.rx_frame_errors++;
+ return;
+ }
+ pskb->protocol = ntohs(header->type);
+ if ((header->length <= LL_HEADER_LENGTH) ||
+ (len <= LL_HEADER_LENGTH)) {
+ if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): Illegal packet size %d(%d,%d)"
+ "- dropping",
+ CTCM_FUNTAIL, dev->name,
+ header->length, dev->mtu, len);
+ ch->logflags |= LOG_FLAG_ILLEGALSIZE;
+ }
+
+ priv->stats.rx_dropped++;
+ priv->stats.rx_length_errors++;
+ return;
+ }
+ header->length -= LL_HEADER_LENGTH;
+ len -= LL_HEADER_LENGTH;
+ if ((header->length > skb_tailroom(pskb)) ||
+ (header->length > len)) {
+ if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): Packet size %d (overrun)"
+ " - dropping", CTCM_FUNTAIL,
+ dev->name, header->length);
+ ch->logflags |= LOG_FLAG_OVERRUN;
+ }
+
+ priv->stats.rx_dropped++;
+ priv->stats.rx_length_errors++;
+ return;
+ }
+ skb_put(pskb, header->length);
+ skb_reset_mac_header(pskb);
+ len -= header->length;
+ skb = dev_alloc_skb(pskb->len);
+ if (!skb) {
+ if (!(ch->logflags & LOG_FLAG_NOMEM)) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): MEMORY allocation error",
+ CTCM_FUNTAIL, dev->name);
+ ch->logflags |= LOG_FLAG_NOMEM;
+ }
+ priv->stats.rx_dropped++;
+ return;
+ }
+ skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
+ pskb->len);
+ skb_reset_mac_header(skb);
+ skb->dev = pskb->dev;
+ skb->protocol = pskb->protocol;
+ pskb->ip_summed = CHECKSUM_UNNECESSARY;
+ skblen = skb->len;
+ /*
+ * reset logflags
+ */
+ ch->logflags = 0;
+ priv->stats.rx_packets++;
+ priv->stats.rx_bytes += skblen;
+ netif_rx_ni(skb);
+ if (len > 0) {
+ skb_pull(pskb, header->length);
+ if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
+ CTCM_DBF_DEV_NAME(TRACE, dev,
+ "Overrun in ctcm_unpack_skb");
+ ch->logflags |= LOG_FLAG_OVERRUN;
+ return;
+ }
+ skb_put(pskb, LL_HEADER_LENGTH);
+ }
+ }
+}
+
+/**
+ * Release a specific channel in the channel list.
+ *
+ * ch Pointer to channel struct to be released.
+ */
+static void channel_free(struct channel *ch)
+{
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
+ ch->flags &= ~CHANNEL_FLAGS_INUSE;
+ fsm_newstate(ch->fsm, CTC_STATE_IDLE);
+}
+
+/**
+ * Remove a specific channel in the channel list.
+ *
+ * ch Pointer to channel struct to be released.
+ */
+static void channel_remove(struct channel *ch)
+{
+ struct channel **c = &channels;
+ char chid[CTCM_ID_SIZE+1];
+ int ok = 0;
+
+ if (ch == NULL)
+ return;
+ else
+ strncpy(chid, ch->id, CTCM_ID_SIZE);
+
+ channel_free(ch);
+ while (*c) {
+ if (*c == ch) {
+ *c = ch->next;
+ fsm_deltimer(&ch->timer);
+ if (IS_MPC(ch))
+ fsm_deltimer(&ch->sweep_timer);
+
+ kfree_fsm(ch->fsm);
+ clear_normalized_cda(&ch->ccw[4]);
+ if (ch->trans_skb != NULL) {
+ clear_normalized_cda(&ch->ccw[1]);
+ dev_kfree_skb_any(ch->trans_skb);
+ }
+ if (IS_MPC(ch)) {
+ tasklet_kill(&ch->ch_tasklet);
+ tasklet_kill(&ch->ch_disc_tasklet);
+ kfree(ch->discontact_th);
+ }
+ kfree(ch->ccw);
+ kfree(ch->irb);
+ kfree(ch);
+ ok = 1;
+ break;
+ }
+ c = &((*c)->next);
+ }
+
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
+ chid, ok ? "OK" : "failed");
+}
+
+/**
+ * Get a specific channel from the channel list.
+ *
+ * type Type of channel we are interested in.
+ * id Id of channel we are interested in.
+ * direction Direction we want to use this channel for.
+ *
+ * returns Pointer to a channel or NULL if no matching channel available.
+ */
+static struct channel *channel_get(enum ctcm_channel_types type,
+ char *id, int direction)
+{
+ struct channel *ch = channels;
+
+ while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
+ ch = ch->next;
+ if (!ch) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%d, %s, %d) not found in channel list\n",
+ CTCM_FUNTAIL, type, id, direction);
+ } else {
+ if (ch->flags & CHANNEL_FLAGS_INUSE)
+ ch = NULL;
+ else {
+ ch->flags |= CHANNEL_FLAGS_INUSE;
+ ch->flags &= ~CHANNEL_FLAGS_RWMASK;
+ ch->flags |= (direction == CTCM_WRITE)
+ ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
+ fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
+ }
+ }
+ return ch;
+}
+
+static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
+{
+ if (!IS_ERR(irb))
+ return 0;
+
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
+ "irb error %ld on device %s\n",
+ PTR_ERR(irb), dev_name(&cdev->dev));
+
+ switch (PTR_ERR(irb)) {
+ case -EIO:
+ dev_err(&cdev->dev,
+ "An I/O-error occurred on the CTCM device\n");
+ break;
+ case -ETIMEDOUT:
+ dev_err(&cdev->dev,
+ "An adapter hardware operation timed out\n");
+ break;
+ default:
+ dev_err(&cdev->dev,
+ "An error occurred on the adapter hardware\n");
+ }
+ return PTR_ERR(irb);
+}
+
+
+/**
+ * Check sense of a unit check.
+ *
+ * ch The channel, the sense code belongs to.
+ * sense The sense code to inspect.
+ */
+static inline void ccw_unit_check(struct channel *ch, __u8 sense)
+{
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
+ "%s(%s): %02x",
+ CTCM_FUNTAIL, ch->id, sense);
+
+ if (sense & SNS0_INTERVENTION_REQ) {
+ if (sense & 0x01) {
+ if (ch->sense_rc != 0x01) {
+ pr_notice(
+ "%s: The communication peer has "
+ "disconnected\n", ch->id);
+ ch->sense_rc = 0x01;
+ }
+ fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
+ } else {
+ if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
+ pr_notice(
+ "%s: The remote operating system is "
+ "not available\n", ch->id);
+ ch->sense_rc = SNS0_INTERVENTION_REQ;
+ }
+ fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
+ }
+ } else if (sense & SNS0_EQUIPMENT_CHECK) {
+ if (sense & SNS0_BUS_OUT_CHECK) {
+ if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): remote HW error %02x",
+ CTCM_FUNTAIL, ch->id, sense);
+ ch->sense_rc = SNS0_BUS_OUT_CHECK;
+ }
+ fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
+ } else {
+ if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): remote read parity error %02x",
+ CTCM_FUNTAIL, ch->id, sense);
+ ch->sense_rc = SNS0_EQUIPMENT_CHECK;
+ }
+ fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
+ }
+ } else if (sense & SNS0_BUS_OUT_CHECK) {
+ if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): BUS OUT error %02x",
+ CTCM_FUNTAIL, ch->id, sense);
+ ch->sense_rc = SNS0_BUS_OUT_CHECK;
+ }
+ if (sense & 0x04) /* data-streaming timeout */
+ fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
+ else /* Data-transfer parity error */
+ fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
+ } else if (sense & SNS0_CMD_REJECT) {
+ if (ch->sense_rc != SNS0_CMD_REJECT) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): Command rejected",
+ CTCM_FUNTAIL, ch->id);
+ ch->sense_rc = SNS0_CMD_REJECT;
+ }
+ } else if (sense == 0) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): Unit check ZERO",
+ CTCM_FUNTAIL, ch->id);
+ fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
+ } else {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): Unit check code %02x unknown",
+ CTCM_FUNTAIL, ch->id, sense);
+ fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
+ }
+}
+
+int ctcm_ch_alloc_buffer(struct channel *ch)
+{
+ clear_normalized_cda(&ch->ccw[1]);
+ ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
+ if (ch->trans_skb == NULL) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): %s trans_skb allocation error",
+ CTCM_FUNTAIL, ch->id,
+ (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
+ "RX" : "TX");
+ return -ENOMEM;
+ }
+
+ ch->ccw[1].count = ch->max_bufsize;
+ if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
+ dev_kfree_skb(ch->trans_skb);
+ ch->trans_skb = NULL;
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): %s set norm_cda failed",
+ CTCM_FUNTAIL, ch->id,
+ (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
+ "RX" : "TX");
+ return -ENOMEM;
+ }
+
+ ch->ccw[1].count = 0;
+ ch->trans_skb_data = ch->trans_skb->data;
+ ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
+ return 0;
+}
+
+/*
+ * Interface API for upper network layers
+ */
+
+/**
+ * Open an interface.
+ * Called from generic network layer when ifconfig up is run.
+ *
+ * dev Pointer to interface struct.
+ *
+ * returns 0 on success, -ERRNO on failure. (Never fails.)
+ */
+int ctcm_open(struct net_device *dev)
+{
+ struct ctcm_priv *priv = dev->ml_priv;
+
+ CTCMY_DBF_DEV_NAME(SETUP, dev, "");
+ if (!IS_MPC(priv))
+ fsm_event(priv->fsm, DEV_EVENT_START, dev);
+ return 0;
+}
+
+/**
+ * Close an interface.
+ * Called from generic network layer when ifconfig down is run.
+ *
+ * dev Pointer to interface struct.
+ *
+ * returns 0 on success, -ERRNO on failure. (Never fails.)
+ */
+int ctcm_close(struct net_device *dev)
+{
+ struct ctcm_priv *priv = dev->ml_priv;
+
+ CTCMY_DBF_DEV_NAME(SETUP, dev, "");
+ if (!IS_MPC(priv))
+ fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
+ return 0;
+}
+
+
+/**
+ * Transmit a packet.
+ * This is a helper function for ctcm_tx().
+ *
+ * ch Channel to be used for sending.
+ * skb Pointer to struct sk_buff of packet to send.
+ * The linklevel header has already been set up
+ * by ctcm_tx().
+ *
+ * returns 0 on success, -ERRNO on failure. (Never fails.)
+ */
+static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
+{
+ unsigned long saveflags;
+ struct ll_header header;
+ int rc = 0;
+ __u16 block_len;
+ int ccw_idx;
+ struct sk_buff *nskb;
+ unsigned long hi;
+
+ /* we need to acquire the lock for testing the state
+ * otherwise we can have an IRQ changing the state to
+ * TXIDLE after the test but before acquiring the lock.
+ */
+ spin_lock_irqsave(&ch->collect_lock, saveflags);
+ if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
+ int l = skb->len + LL_HEADER_LENGTH;
+
+ if (ch->collect_len + l > ch->max_bufsize - 2) {
+ spin_unlock_irqrestore(&ch->collect_lock, saveflags);
+ return -EBUSY;
+ } else {
+ atomic_inc(&skb->users);
+ header.length = l;
+ header.type = skb->protocol;
+ header.unused = 0;
+ memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
+ LL_HEADER_LENGTH);
+ skb_queue_tail(&ch->collect_queue, skb);
+ ch->collect_len += l;
+ }
+ spin_unlock_irqrestore(&ch->collect_lock, saveflags);
+ goto done;
+ }
+ spin_unlock_irqrestore(&ch->collect_lock, saveflags);
+ /*
+ * Protect skb against beeing free'd by upper
+ * layers.
+ */
+ atomic_inc(&skb->users);
+ ch->prof.txlen += skb->len;
+ header.length = skb->len + LL_HEADER_LENGTH;
+ header.type = skb->protocol;
+ header.unused = 0;
+ memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
+ block_len = skb->len + 2;
+ *((__u16 *)skb_push(skb, 2)) = block_len;
+
+ /*
+ * IDAL support in CTCM is broken, so we have to
+ * care about skb's above 2G ourselves.
+ */
+ hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
+ if (hi) {
+ nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
+ if (!nskb) {
+ atomic_dec(&skb->users);
+ skb_pull(skb, LL_HEADER_LENGTH + 2);
+ ctcm_clear_busy(ch->netdev);
+ return -ENOMEM;
+ } else {
+ memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
+ atomic_inc(&nskb->users);
+ atomic_dec(&skb->users);
+ dev_kfree_skb_irq(skb);
+ skb = nskb;
+ }
+ }
+
+ ch->ccw[4].count = block_len;
+ if (set_normalized_cda(&ch->ccw[4], skb->data)) {
+ /*
+ * idal allocation failed, try via copying to
+ * trans_skb. trans_skb usually has a pre-allocated
+ * idal.
+ */
+ if (ctcm_checkalloc_buffer(ch)) {
+ /*
+ * Remove our header. It gets added
+ * again on retransmit.
+ */
+ atomic_dec(&skb->users);
+ skb_pull(skb, LL_HEADER_LENGTH + 2);
+ ctcm_clear_busy(ch->netdev);
+ return -ENOMEM;
+ }
+
+ skb_reset_tail_pointer(ch->trans_skb);
+ ch->trans_skb->len = 0;
+ ch->ccw[1].count = skb->len;
+ skb_copy_from_linear_data(skb,
+ skb_put(ch->trans_skb, skb->len), skb->len);
+ atomic_dec(&skb->users);
+ dev_kfree_skb_irq(skb);
+ ccw_idx = 0;
+ } else {
+ skb_queue_tail(&ch->io_queue, skb);
+ ccw_idx = 3;
+ }
+ ch->retry = 0;
+ fsm_newstate(ch->fsm, CTC_STATE_TX);
+ fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
+ spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
+ ch->prof.send_stamp = current_kernel_time(); /* xtime */
+ rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
+ (unsigned long)ch, 0xff, 0);
+ spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
+ if (ccw_idx == 3)
+ ch->prof.doios_single++;
+ if (rc != 0) {
+ fsm_deltimer(&ch->timer);
+ ctcm_ccw_check_rc(ch, rc, "single skb TX");
+ if (ccw_idx == 3)
+ skb_dequeue_tail(&ch->io_queue);
+ /*
+ * Remove our header. It gets added
+ * again on retransmit.
+ */
+ skb_pull(skb, LL_HEADER_LENGTH + 2);
+ } else if (ccw_idx == 0) {
+ struct net_device *dev = ch->netdev;
+ struct ctcm_priv *priv = dev->ml_priv;
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
+ }
+done:
+ ctcm_clear_busy(ch->netdev);
+ return rc;
+}
+
+static void ctcmpc_send_sweep_req(struct channel *rch)
+{
+ struct net_device *dev = rch->netdev;
+ struct ctcm_priv *priv;
+ struct mpc_group *grp;
+ struct th_sweep *header;
+ struct sk_buff *sweep_skb;
+ struct channel *ch;
+ /* int rc = 0; */
+
+ priv = dev->ml_priv;
+ grp = priv->mpcg;
+ ch = priv->channel[CTCM_WRITE];
+
+ /* sweep processing is not complete until response and request */
+ /* has completed for all read channels in group */
+ if (grp->in_sweep == 0) {
+ grp->in_sweep = 1;
+ grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
+ grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
+ }
+
+ sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
+
+ if (sweep_skb == NULL) {
+ /* rc = -ENOMEM; */
+ goto nomem;
+ }
+
+ header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
+
+ if (!header) {
+ dev_kfree_skb_any(sweep_skb);
+ /* rc = -ENOMEM; */
+ goto nomem;
+ }
+
+ header->th.th_seg = 0x00 ;
+ header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
+ header->th.th_blk_flag = 0x00;
+ header->th.th_is_xid = 0x00;
+ header->th.th_seq_num = 0x00;
+ header->sw.th_last_seq = ch->th_seq_num;
+
+ memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
+
+ kfree(header);
+
+ dev->trans_start = jiffies;
+ skb_queue_tail(&ch->sweep_queue, sweep_skb);
+
+ fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
+
+ return;
+
+nomem:
+ grp->in_sweep = 0;
+ ctcm_clear_busy(dev);
+ fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
+
+ return;
+}
+
+/*
+ * MPC mode version of transmit_skb
+ */
+static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
+{
+ struct pdu *p_header;
+ struct net_device *dev = ch->netdev;
+ struct ctcm_priv *priv = dev->ml_priv;
+ struct mpc_group *grp = priv->mpcg;
+ struct th_header *header;
+ struct sk_buff *nskb;
+ int rc = 0;
+ int ccw_idx;
+ unsigned long hi;
+ unsigned long saveflags = 0; /* avoids compiler warning */
+
+ CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
+ __func__, dev->name, smp_processor_id(), ch,
+ ch->id, fsm_getstate_str(ch->fsm));
+
+ if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
+ spin_lock_irqsave(&ch->collect_lock, saveflags);
+ atomic_inc(&skb->users);
+ p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
+
+ if (!p_header) {
+ spin_unlock_irqrestore(&ch->collect_lock, saveflags);
+ goto nomem_exit;
+ }
+
+ p_header->pdu_offset = skb->len;
+ p_header->pdu_proto = 0x01;
+ p_header->pdu_flag = 0x00;
+ if (skb->protocol == ntohs(ETH_P_SNAP)) {
+ p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
+ } else {
+ p_header->pdu_flag |= PDU_FIRST;
+ }
+ p_header->pdu_seq = 0;
+ memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
+ PDU_HEADER_LENGTH);
+
+ CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
+ "pdu header and data for up to 32 bytes:\n",
+ __func__, dev->name, skb->len);
+ CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
+
+ skb_queue_tail(&ch->collect_queue, skb);
+ ch->collect_len += skb->len;
+ kfree(p_header);
+
+ spin_unlock_irqrestore(&ch->collect_lock, saveflags);
+ goto done;
+ }
+
+ /*
+ * Protect skb against beeing free'd by upper
+ * layers.
+ */
+ atomic_inc(&skb->users);
+
+ /*
+ * IDAL support in CTCM is broken, so we have to
+ * care about skb's above 2G ourselves.
+ */
+ hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
+ if (hi) {
+ nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
+ if (!nskb) {
+ goto nomem_exit;
+ } else {
+ memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
+ atomic_inc(&nskb->users);
+ atomic_dec(&skb->users);
+ dev_kfree_skb_irq(skb);
+ skb = nskb;
+ }
+ }
+
+ p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
+
+ if (!p_header)
+ goto nomem_exit;
+
+ p_header->pdu_offset = skb->len;
+ p_header->pdu_proto = 0x01;
+ p_header->pdu_flag = 0x00;
+ p_header->pdu_seq = 0;
+ if (skb->protocol == ntohs(ETH_P_SNAP)) {
+ p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
+ } else {
+ p_header->pdu_flag |= PDU_FIRST;
+ }
+ memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
+
+ kfree(p_header);
+
+ if (ch->collect_len > 0) {
+ spin_lock_irqsave(&ch->collect_lock, saveflags);
+ skb_queue_tail(&ch->collect_queue, skb);
+ ch->collect_len += skb->len;
+ skb = skb_dequeue(&ch->collect_queue);
+ ch->collect_len -= skb->len;
+ spin_unlock_irqrestore(&ch->collect_lock, saveflags);
+ }
+
+ p_header = (struct pdu *)skb->data;
+ p_header->pdu_flag |= PDU_LAST;
+
+ ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
+
+ header = kmalloc(TH_HEADER_LENGTH, gfp_type());
+ if (!header)
+ goto nomem_exit;
+
+ header->th_seg = 0x00;
+ header->th_ch_flag = TH_HAS_PDU; /* Normal data */
+ header->th_blk_flag = 0x00;
+ header->th_is_xid = 0x00; /* Just data here */
+ ch->th_seq_num++;
+ header->th_seq_num = ch->th_seq_num;
+
+ CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
+ __func__, dev->name, ch->th_seq_num);
+
+ /* put the TH on the packet */
+ memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
+
+ kfree(header);
+
+ CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
+ "up to 32 bytes sent to vtam:\n",
+ __func__, dev->name, skb->len);
+ CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
+
+ ch->ccw[4].count = skb->len;
+ if (set_normalized_cda(&ch->ccw[4], skb->data)) {
+ /*
+ * idal allocation failed, try via copying to trans_skb.
+ * trans_skb usually has a pre-allocated idal.
+ */
+ if (ctcm_checkalloc_buffer(ch)) {
+ /*
+ * Remove our header.
+ * It gets added again on retransmit.
+ */
+ goto nomem_exit;
+ }
+
+ skb_reset_tail_pointer(ch->trans_skb);
+ ch->trans_skb->len = 0;
+ ch->ccw[1].count = skb->len;
+ memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
+ atomic_dec(&skb->users);
+ dev_kfree_skb_irq(skb);
+ ccw_idx = 0;
+ CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
+ "up to 32 bytes sent to vtam:\n",
+ __func__, dev->name, ch->trans_skb->len);
+ CTCM_D3_DUMP((char *)ch->trans_skb->data,
+ min_t(int, 32, ch->trans_skb->len));
+ } else {
+ skb_queue_tail(&ch->io_queue, skb);
+ ccw_idx = 3;
+ }
+ ch->retry = 0;
+ fsm_newstate(ch->fsm, CTC_STATE_TX);
+ fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
+
+ if (do_debug_ccw)
+ ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
+ sizeof(struct ccw1) * 3);
+
+ spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
+ ch->prof.send_stamp = current_kernel_time(); /* xtime */
+ rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
+ (unsigned long)ch, 0xff, 0);
+ spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
+ if (ccw_idx == 3)
+ ch->prof.doios_single++;
+ if (rc != 0) {
+ fsm_deltimer(&ch->timer);
+ ctcm_ccw_check_rc(ch, rc, "single skb TX");
+ if (ccw_idx == 3)
+ skb_dequeue_tail(&ch->io_queue);
+ } else if (ccw_idx == 0) {
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
+ }
+ if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
+ ctcmpc_send_sweep_req(ch);
+
+ goto done;
+nomem_exit:
+ CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
+ "%s(%s): MEMORY allocation ERROR\n",
+ CTCM_FUNTAIL, ch->id);
+ rc = -ENOMEM;
+ atomic_dec(&skb->users);
+ dev_kfree_skb_any(skb);
+ fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
+done:
+ CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
+ return rc;
+}
+
+/**
+ * Start transmission of a packet.
+ * Called from generic network device layer.
+ *
+ * skb Pointer to buffer containing the packet.
+ * dev Pointer to interface struct.
+ *
+ * returns 0 if packet consumed, !0 if packet rejected.
+ * Note: If we return !0, then the packet is free'd by
+ * the generic network layer.
+ */
+/* first merge version - leaving both functions separated */
+static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ctcm_priv *priv = dev->ml_priv;
+
+ if (skb == NULL) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): NULL sk_buff passed",
+ CTCM_FUNTAIL, dev->name);
+ priv->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+ if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s(%s): Got sk_buff with head room < %ld bytes",
+ CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
+ dev_kfree_skb(skb);
+ priv->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+
+ /*
+ * If channels are not running, try to restart them
+ * and throw away packet.
+ */
+ if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
+ fsm_event(priv->fsm, DEV_EVENT_START, dev);
+ dev_kfree_skb(skb);
+ priv->stats.tx_dropped++;
+ priv->stats.tx_errors++;
+ priv->stats.tx_carrier_errors++;
+ return NETDEV_TX_OK;
+ }
+
+ if (ctcm_test_and_set_busy(dev))
+ return NETDEV_TX_BUSY;
+
+ dev->trans_start = jiffies;
+ if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
+ return NETDEV_TX_BUSY;
+ return NETDEV_TX_OK;
+}
+
+/* unmerged MPC variant of ctcm_tx */
+static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
+{
+ int len = 0;
+ struct ctcm_priv *priv = dev->ml_priv;
+ struct mpc_group *grp = priv->mpcg;
+ struct sk_buff *newskb = NULL;
+
+ /*
+ * Some sanity checks ...
+ */
+ if (skb == NULL) {
+ CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
+ "%s(%s): NULL sk_buff passed",
+ CTCM_FUNTAIL, dev->name);
+ priv->stats.tx_dropped++;
+ goto done;
+ }
+ if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
+ CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
+ "%s(%s): Got sk_buff with head room < %ld bytes",
+ CTCM_FUNTAIL, dev->name,
+ TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
+
+ CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
+
+ len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
+ newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
+
+ if (!newskb) {
+ CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
+ "%s: %s: __dev_alloc_skb failed",
+ __func__, dev->name);
+
+ dev_kfree_skb_any(skb);
+ priv->stats.tx_dropped++;
+ priv->stats.tx_errors++;
+ priv->stats.tx_carrier_errors++;
+ fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
+ goto done;
+ }
+ newskb->protocol = skb->protocol;
+ skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
+ memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
+ dev_kfree_skb_any(skb);
+ skb = newskb;
+ }
+
+ /*
+ * If channels are not running,
+ * notify anybody about a link failure and throw
+ * away packet.
+ */
+ if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
+ (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
+ dev_kfree_skb_any(skb);
+ CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
+ "%s(%s): inactive MPCGROUP - dropped",
+ CTCM_FUNTAIL, dev->name);
+ priv->stats.tx_dropped++;
+ priv->stats.tx_errors++;
+ priv->stats.tx_carrier_errors++;
+ goto done;
+ }
+
+ if (ctcm_test_and_set_busy(dev)) {
+ CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
+ "%s(%s): device busy - dropped",
+ CTCM_FUNTAIL, dev->name);
+ dev_kfree_skb_any(skb);
+ priv->stats.tx_dropped++;
+ priv->stats.tx_errors++;
+ priv->stats.tx_carrier_errors++;
+ fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
+ goto done;
+ }
+
+ dev->trans_start = jiffies;
+ if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
+ CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
+ "%s(%s): device error - dropped",
+ CTCM_FUNTAIL, dev->name);
+ dev_kfree_skb_any(skb);
+ priv->stats.tx_dropped++;
+ priv->stats.tx_errors++;
+ priv->stats.tx_carrier_errors++;
+ ctcm_clear_busy(dev);
+ fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
+ goto done;
+ }
+ ctcm_clear_busy(dev);
+done:
+ if (do_debug)
+ MPC_DBF_DEV_NAME(TRACE, dev, "exit");
+
+ return NETDEV_TX_OK; /* handle freeing of skb here */
+}
+
+
+/**
+ * Sets MTU of an interface.
+ *
+ * dev Pointer to interface struct.
+ * new_mtu The new MTU to use for this interface.
+ *
+ * returns 0 on success, -EINVAL if MTU is out of valid range.
+ * (valid range is 576 .. 65527). If VM is on the
+ * remote side, maximum MTU is 32760, however this is
+ * not checked here.
+ */
+static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct ctcm_priv *priv;
+ int max_bufsize;
+
+ if (new_mtu < 576 || new_mtu > 65527)
+ return -EINVAL;
+
+ priv = dev->ml_priv;
+ max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
+
+ if (IS_MPC(priv)) {
+ if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
+ return -EINVAL;
+ dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
+ } else {
+ if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
+ return -EINVAL;
+ dev->hard_header_len = LL_HEADER_LENGTH + 2;
+ }
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+/**
+ * Returns interface statistics of a device.
+ *
+ * dev Pointer to interface struct.
+ *
+ * returns Pointer to stats struct of this interface.
+ */
+static struct net_device_stats *ctcm_stats(struct net_device *dev)
+{
+ return &((struct ctcm_priv *)dev->ml_priv)->stats;
+}
+
+static void ctcm_free_netdevice(struct net_device *dev)
+{
+ struct ctcm_priv *priv;
+ struct mpc_group *grp;
+
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
+ "%s(%s)", CTCM_FUNTAIL, dev->name);
+ priv = dev->ml_priv;
+ if (priv) {
+ grp = priv->mpcg;
+ if (grp) {
+ if (grp->fsm)
+ kfree_fsm(grp->fsm);
+ if (grp->xid_skb)
+ dev_kfree_skb(grp->xid_skb);
+ if (grp->rcvd_xid_skb)
+ dev_kfree_skb(grp->rcvd_xid_skb);
+ tasklet_kill(&grp->mpc_tasklet2);
+ kfree(grp);
+ priv->mpcg = NULL;
+ }
+ if (priv->fsm) {
+ kfree_fsm(priv->fsm);
+ priv->fsm = NULL;
+ }
+ kfree(priv->xid);
+ priv->xid = NULL;
+ /*
+ * Note: kfree(priv); is done in "opposite" function of
+ * allocator function probe_device which is remove_device.
+ */
+ }
+#ifdef MODULE
+ free_netdev(dev);
+#endif
+}
+
+struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
+
+static const struct net_device_ops ctcm_netdev_ops = {
+ .ndo_open = ctcm_open,
+ .ndo_stop = ctcm_close,
+ .ndo_get_stats = ctcm_stats,
+ .ndo_change_mtu = ctcm_change_mtu,
+ .ndo_start_xmit = ctcm_tx,
+};
+
+static const struct net_device_ops ctcm_mpc_netdev_ops = {
+ .ndo_open = ctcm_open,
+ .ndo_stop = ctcm_close,
+ .ndo_get_stats = ctcm_stats,
+ .ndo_change_mtu = ctcm_change_mtu,
+ .ndo_start_xmit = ctcmpc_tx,
+};
+
+void static ctcm_dev_setup(struct net_device *dev)
+{
+ dev->type = ARPHRD_SLIP;
+ dev->tx_queue_len = 100;
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+}
+
+/*
+ * Initialize everything of the net device except the name and the
+ * channel structs.
+ */
+static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
+{
+ struct net_device *dev;
+ struct mpc_group *grp;
+ if (!priv)
+ return NULL;
+
+ if (IS_MPC(priv))
+ dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
+ else
+ dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
+
+ if (!dev) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
+ "%s: MEMORY allocation ERROR",
+ CTCM_FUNTAIL);
+ return NULL;
+ }
+ dev->ml_priv = priv;
+ priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
+ CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
+ dev_fsm, dev_fsm_len, GFP_KERNEL);
+ if (priv->fsm == NULL) {
+ CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
+ free_netdev(dev);
+ return NULL;
+ }
+ fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
+ fsm_settimer(priv->fsm, &priv->restart_timer);
+
+ if (IS_MPC(priv)) {
+ /* MPC Group Initializations */
+ grp = ctcmpc_init_mpc_group(priv);
+ if (grp == NULL) {
+ MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
+ free_netdev(dev);
+ return NULL;
+ }
+ tasklet_init(&grp->mpc_tasklet2,
+ mpc_group_ready, (unsigned long)dev);
+ dev->mtu = MPC_BUFSIZE_DEFAULT -
+ TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
+
+ dev->netdev_ops = &ctcm_mpc_netdev_ops;
+ dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
+ priv->buffer_size = MPC_BUFSIZE_DEFAULT;
+ } else {
+ dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
+ dev->netdev_ops = &ctcm_netdev_ops;
+ dev->hard_header_len = LL_HEADER_LENGTH + 2;
+ }
+
+ CTCMY_DBF_DEV(SETUP, dev, "finished");
+
+ return dev;
+}
+
+/**
+ * Main IRQ handler.
+ *
+ * cdev The ccw_device the interrupt is for.
+ * intparm interruption parameter.
+ * irb interruption response block.
+ */
+static void ctcm_irq_handler(struct ccw_device *cdev,
+ unsigned long intparm, struct irb *irb)
+{
+ struct channel *ch;
+ struct net_device *dev;
+ struct ctcm_priv *priv;
+ struct ccwgroup_device *cgdev;
+ int cstat;
+ int dstat;
+
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
+ "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
+
+ if (ctcm_check_irb_error(cdev, irb))
+ return;
+
+ cgdev = dev_get_drvdata(&cdev->dev);
+
+ cstat = irb->scsw.cmd.cstat;
+ dstat = irb->scsw.cmd.dstat;
+
+ /* Check for unsolicited interrupts. */
+ if (cgdev == NULL) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
+ "%s(%s) unsolicited irq: c-%02x d-%02x\n",
+ CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
+ dev_warn(&cdev->dev,
+ "The adapter received a non-specific IRQ\n");
+ return;
+ }
+
+ priv = dev_get_drvdata(&cgdev->dev);
+
+ /* Try to extract channel from driver data. */
+ if (priv->channel[CTCM_READ]->cdev == cdev)
+ ch = priv->channel[CTCM_READ];
+ else if (priv->channel[CTCM_WRITE]->cdev == cdev)
+ ch = priv->channel[CTCM_WRITE];
+ else {
+ dev_err(&cdev->dev,
+ "%s: Internal error: Can't determine channel for "
+ "interrupt device %s\n",
+ __func__, dev_name(&cdev->dev));
+ /* Explain: inconsistent internal structures */
+ return;
+ }
+
+ dev = ch->netdev;
+ if (dev == NULL) {
+ dev_err(&cdev->dev,
+ "%s Internal error: net_device is NULL, ch = 0x%p\n",
+ __func__, ch);
+ /* Explain: inconsistent internal structures */
+ return;
+ }
+
+ /* Copy interruption response block. */
+ memcpy(ch->irb, irb, sizeof(struct irb));
+
+ /* Issue error message and return on subchannel error code */
+ if (irb->scsw.cmd.cstat) {
+ fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
+ CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
+ dev_warn(&cdev->dev,
+ "A check occurred on the subchannel\n");
+ return;
+ }
+
+ /* Check the reason-code of a unit check */
+ if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
+ if ((irb->ecw[0] & ch->sense_rc) == 0)
+ /* print it only once */
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
+ "%s(%s): sense=%02x, ds=%02x",
+ CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
+ ccw_unit_check(ch, irb->ecw[0]);
+ return;
+ }
+ if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
+ if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
+ fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
+ else
+ fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
+ return;
+ }
+ if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
+ fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
+ return;
+ }
+ if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
+ (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
+ (irb->scsw.cmd.stctl ==
+ (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
+ fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
+ else
+ fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
+
+}
+
+/**
+ * Add ctcm specific attributes.
+ * Add ctcm private data.
+ *
+ * cgdev pointer to ccwgroup_device just added
+ *
+ * returns 0 on success, !0 on failure.
+ */
+static int ctcm_probe_device(struct ccwgroup_device *cgdev)
+{
+ struct ctcm_priv *priv;
+ int rc;
+
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
+ "%s %p",
+ __func__, cgdev);
+
+ if (!get_device(&cgdev->dev))
+ return -ENODEV;
+
+ priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
+ if (!priv) {
+ CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
+ "%s: memory allocation failure",
+ CTCM_FUNTAIL);
+ put_device(&cgdev->dev);
+ return -ENOMEM;
+ }
+
+ rc = ctcm_add_files(&cgdev->dev);
+ if (rc) {
+ kfree(priv);
+ put_device(&cgdev->dev);
+ return rc;
+ }
+ priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
+ cgdev->cdev[0]->handler = ctcm_irq_handler;
+ cgdev->cdev[1]->handler = ctcm_irq_handler;
+ dev_set_drvdata(&cgdev->dev, priv);
+
+ return 0;
+}
+
+/**
+ * Add a new channel to the list of channels.
+ * Keeps the channel list sorted.
+ *
+ * cdev The ccw_device to be added.
+ * type The type class of the new channel.
+ * priv Points to the private data of the ccwgroup_device.
+ *
+ * returns 0 on success, !0 on error.
+ */
+static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
+ struct ctcm_priv *priv)
+{
+ struct channel **c = &channels;
+ struct channel *ch;
+ int ccw_num;
+ int rc = 0;
+
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
+ "%s(%s), type %d, proto %d",
+ __func__, dev_name(&cdev->dev), type, priv->protocol);
+
+ ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
+ if (ch == NULL)
+ return -ENOMEM;
+
+ ch->protocol = priv->protocol;
+ if (IS_MPC(priv)) {
+ ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
+ if (ch->discontact_th == NULL)
+ goto nomem_return;
+
+ ch->discontact_th->th_blk_flag = TH_DISCONTACT;
+ tasklet_init(&ch->ch_disc_tasklet,
+ mpc_action_send_discontact, (unsigned long)ch);
+
+ tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
+ ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
+ ccw_num = 17;
+ } else
+ ccw_num = 8;
+
+ ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
+ if (ch->ccw == NULL)
+ goto nomem_return;
+
+ ch->cdev = cdev;
+ snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
+ ch->type = type;
+
+ /**
+ * "static" ccws are used in the following way:
+ *
+ * ccw[0..2] (Channel program for generic I/O):
+ * 0: prepare
+ * 1: read or write (depending on direction) with fixed
+ * buffer (idal allocated once when buffer is allocated)
+ * 2: nop
+ * ccw[3..5] (Channel program for direct write of packets)
+ * 3: prepare
+ * 4: write (idal allocated on every write).
+ * 5: nop
+ * ccw[6..7] (Channel program for initial channel setup):
+ * 6: set extended mode
+ * 7: nop
+ *
+ * ch->ccw[0..5] are initialized in ch_action_start because
+ * the channel's direction is yet unknown here.
+ *
+ * ccws used for xid2 negotiations
+ * ch-ccw[8-14] need to be used for the XID exchange either
+ * X side XID2 Processing
+ * 8: write control
+ * 9: write th
+ * 10: write XID
+ * 11: read th from secondary
+ * 12: read XID from secondary
+ * 13: read 4 byte ID
+ * 14: nop
+ * Y side XID Processing
+ * 8: sense
+ * 9: read th
+ * 10: read XID
+ * 11: write th
+ * 12: write XID
+ * 13: write 4 byte ID
+ * 14: nop
+ *
+ * ccws used for double noop due to VM timing issues
+ * which result in unrecoverable Busy on channel
+ * 15: nop
+ * 16: nop
+ */
+ ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
+ ch->ccw[6].flags = CCW_FLAG_SLI;
+
+ ch->ccw[7].cmd_code = CCW_CMD_NOOP;
+ ch->ccw[7].flags = CCW_FLAG_SLI;
+
+ if (IS_MPC(priv)) {
+ ch->ccw[15].cmd_code = CCW_CMD_WRITE;
+ ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
+ ch->ccw[15].count = TH_HEADER_LENGTH;
+ ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
+
+ ch->ccw[16].cmd_code = CCW_CMD_NOOP;
+ ch->ccw[16].flags = CCW_FLAG_SLI;
+
+ ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
+ ctc_ch_event_names, CTC_MPC_NR_STATES,
+ CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
+ mpc_ch_fsm_len, GFP_KERNEL);
+ } else {
+ ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
+ ctc_ch_event_names, CTC_NR_STATES,
+ CTC_NR_EVENTS, ch_fsm,
+ ch_fsm_len, GFP_KERNEL);
+ }
+ if (ch->fsm == NULL)
+ goto free_return;
+
+ fsm_newstate(ch->fsm, CTC_STATE_IDLE);
+
+ ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
+ if (ch->irb == NULL)
+ goto nomem_return;
+
+ while (*c && ctcm_less_than((*c)->id, ch->id))
+ c = &(*c)->next;
+
+ if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
+ "%s (%s) already in list, using old entry",
+ __func__, (*c)->id);
+
+ goto free_return;
+ }
+
+ spin_lock_init(&ch->collect_lock);
+
+ fsm_settimer(ch->fsm, &ch->timer);
+ skb_queue_head_init(&ch->io_queue);
+ skb_queue_head_init(&ch->collect_queue);
+
+ if (IS_MPC(priv)) {
+ fsm_settimer(ch->fsm, &ch->sweep_timer);
+ skb_queue_head_init(&ch->sweep_queue);
+ }
+ ch->next = *c;
+ *c = ch;
+ return 0;
+
+nomem_return:
+ rc = -ENOMEM;
+
+free_return: /* note that all channel pointers are 0 or valid */
+ kfree(ch->ccw);
+ kfree(ch->discontact_th);
+ kfree_fsm(ch->fsm);
+ kfree(ch->irb);
+ kfree(ch);
+ return rc;
+}
+
+/*
+ * Return type of a detected device.
+ */
+static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
+{
+ enum ctcm_channel_types type;
+ type = (enum ctcm_channel_types)id->driver_info;
+
+ if (type == ctcm_channel_type_ficon)
+ type = ctcm_channel_type_escon;
+
+ return type;
+}
+
+/**
+ *
+ * Setup an interface.
+ *
+ * cgdev Device to be setup.
+ *
+ * returns 0 on success, !0 on failure.
+ */
+static int ctcm_new_device(struct ccwgroup_device *cgdev)
+{
+ char read_id[CTCM_ID_SIZE];
+ char write_id[CTCM_ID_SIZE];
+ int direction;
+ enum ctcm_channel_types type;
+ struct ctcm_priv *priv;
+ struct net_device *dev;
+ struct ccw_device *cdev0;
+ struct ccw_device *cdev1;
+ struct channel *readc;
+ struct channel *writec;
+ int ret;
+ int result;
+
+ priv = dev_get_drvdata(&cgdev->dev);
+ if (!priv) {
+ result = -ENODEV;
+ goto out_err_result;
+ }
+
+ cdev0 = cgdev->cdev[0];
+ cdev1 = cgdev->cdev[1];
+
+ type = get_channel_type(&cdev0->id);
+
+ snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
+ snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
+
+ ret = add_channel(cdev0, type, priv);
+ if (ret) {
+ result = ret;
+ goto out_err_result;
+ }
+ ret = add_channel(cdev1, type, priv);
+ if (ret) {
+ result = ret;
+ goto out_remove_channel1;
+ }
+
+ ret = ccw_device_set_online(cdev0);
+ if (ret != 0) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
+ "%s(%s) set_online rc=%d",
+ CTCM_FUNTAIL, read_id, ret);
+ result = -EIO;
+ goto out_remove_channel2;
+ }
+
+ ret = ccw_device_set_online(cdev1);
+ if (ret != 0) {
+ CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
+ "%s(%s) set_online rc=%d",
+ CTCM_FUNTAIL, write_id, ret);
+
+ result = -EIO;
+ goto out_ccw1;
+ }
+
+ dev = ctcm_init_netdevice(priv);
+ if (dev == NULL) {
+ result = -ENODEV;
+ goto out_ccw2;
+ }
+
+ for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
+ priv->channel[direction] =
+ channel_get(type, direction == CTCM_READ ?
+ read_id : write_id, direction);
+ if (priv->channel[direction] == NULL) {
+ if (direction == CTCM_WRITE)
+ channel_free(priv->channel[CTCM_READ]);
+ goto out_dev;
+ }
+ priv->channel[direction]->netdev = dev;
+ priv->channel[direction]->protocol = priv->protocol;
+ priv->channel[direction]->max_bufsize = priv->buffer_size;
+ }
+ /* sysfs magic */
+ SET_NETDEV_DEV(dev, &cgdev->dev);
+
+ if (register_netdev(dev)) {
+ result = -ENODEV;
+ goto out_dev;
+ }
+
+ if (ctcm_add_attributes(&cgdev->dev)) {
+ result = -ENODEV;
+ goto out_unregister;
+ }
+
+ strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
+
+ dev_info(&dev->dev,
+ "setup OK : r/w = %s/%s, protocol : %d\n",
+ priv->channel[CTCM_READ]->id,
+ priv->channel[CTCM_WRITE]->id, priv->protocol);
+
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
+ "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
+ priv->channel[CTCM_READ]->id,
+ priv->channel[CTCM_WRITE]->id, priv->protocol);
+
+ return 0;
+out_unregister:
+ unregister_netdev(dev);
+out_dev:
+ ctcm_free_netdevice(dev);
+out_ccw2:
+ ccw_device_set_offline(cgdev->cdev[1]);
+out_ccw1:
+ ccw_device_set_offline(cgdev->cdev[0]);
+out_remove_channel2:
+ readc = channel_get(type, read_id, CTCM_READ);
+ channel_remove(readc);
+out_remove_channel1:
+ writec = channel_get(type, write_id, CTCM_WRITE);
+ channel_remove(writec);
+out_err_result:
+ return result;
+}
+
+/**
+ * Shutdown an interface.
+ *
+ * cgdev Device to be shut down.
+ *
+ * returns 0 on success, !0 on failure.
+ */
+static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
+{
+ struct ctcm_priv *priv;
+ struct net_device *dev;
+
+ priv = dev_get_drvdata(&cgdev->dev);
+ if (!priv)
+ return -ENODEV;
+
+ if (priv->channel[CTCM_READ]) {
+ dev = priv->channel[CTCM_READ]->netdev;
+ CTCM_DBF_DEV(SETUP, dev, "");
+ /* Close the device */
+ ctcm_close(dev);
+ dev->flags &= ~IFF_RUNNING;
+ ctcm_remove_attributes(&cgdev->dev);
+ channel_free(priv->channel[CTCM_READ]);
+ } else
+ dev = NULL;
+
+ if (priv->channel[CTCM_WRITE])
+ channel_free(priv->channel[CTCM_WRITE]);
+
+ if (dev) {
+ unregister_netdev(dev);
+ ctcm_free_netdevice(dev);
+ }
+
+ if (priv->fsm)
+ kfree_fsm(priv->fsm);
+
+ ccw_device_set_offline(cgdev->cdev[1]);
+ ccw_device_set_offline(cgdev->cdev[0]);
+
+ if (priv->channel[CTCM_READ])
+ channel_remove(priv->channel[CTCM_READ]);
+ if (priv->channel[CTCM_WRITE])
+ channel_remove(priv->channel[CTCM_WRITE]);
+ priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
+
+ return 0;
+
+}
+
+
+static void ctcm_remove_device(struct ccwgroup_device *cgdev)
+{
+ struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
+
+ BUG_ON(priv == NULL);
+
+ CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
+ "removing device %p, proto : %d",
+ cgdev, priv->protocol);
+
+ if (cgdev->state == CCWGROUP_ONLINE)
+ ctcm_shutdown_device(cgdev);
+ ctcm_remove_files(&cgdev->dev);
+ dev_set_drvdata(&cgdev->dev, NULL);
+ kfree(priv);
+ put_device(&cgdev->dev);
+}
+
+static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
+{
+ struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
+
+ if (gdev->state == CCWGROUP_OFFLINE)
+ return 0;
+ netif_device_detach(priv->channel[CTCM_READ]->netdev);
+ ctcm_close(priv->channel[CTCM_READ]->netdev);
+ if (!wait_event_timeout(priv->fsm->wait_q,
+ fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
+ netif_device_attach(priv->channel[CTCM_READ]->netdev);
+ return -EBUSY;
+ }
+ ccw_device_set_offline(gdev->cdev[1]);
+ ccw_device_set_offline(gdev->cdev[0]);
+ return 0;
+}
+
+static int ctcm_pm_resume(struct ccwgroup_device *gdev)
+{
+ struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
+ int rc;
+
+ if (gdev->state == CCWGROUP_OFFLINE)
+ return 0;
+ rc = ccw_device_set_online(gdev->cdev[1]);
+ if (rc)
+ goto err_out;
+ rc = ccw_device_set_online(gdev->cdev[0]);
+ if (rc)
+ goto err_out;
+ ctcm_open(priv->channel[CTCM_READ]->netdev);
+err_out:
+ netif_device_attach(priv->channel[CTCM_READ]->netdev);
+ return rc;
+}
+
+static struct ccw_device_id ctcm_ids[] = {
+ {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
+ {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
+ {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
+ {},
+};
+MODULE_DEVICE_TABLE(ccw, ctcm_ids);
+
+static struct ccw_driver ctcm_ccw_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ctcm",
+ },
+ .ids = ctcm_ids,
+ .probe = ccwgroup_probe_ccwdev,
+ .remove = ccwgroup_remove_ccwdev,
+ .int_class = IOINT_CTC,
+};
+
+static struct ccwgroup_driver ctcm_group_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = CTC_DRIVER_NAME,
+ },
+ .max_slaves = 2,
+ .driver_id = 0xC3E3C3D4, /* CTCM */
+ .probe = ctcm_probe_device,
+ .remove = ctcm_remove_device,
+ .set_online = ctcm_new_device,
+ .set_offline = ctcm_shutdown_device,
+ .freeze = ctcm_pm_suspend,
+ .thaw = ctcm_pm_resume,
+ .restore = ctcm_pm_resume,
+};
+
+static ssize_t
+ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
+ size_t count)
+{
+ int err;
+
+ err = ccwgroup_create_from_string(ctcm_root_dev,
+ ctcm_group_driver.driver_id,
+ &ctcm_ccw_driver, 2, buf);
+ return err ? err : count;
+}
+
+static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
+
+static struct attribute *ctcm_group_attrs[] = {
+ &driver_attr_group.attr,
+ NULL,
+};
+
+static struct attribute_group ctcm_group_attr_group = {
+ .attrs = ctcm_group_attrs,
+};
+
+static const struct attribute_group *ctcm_group_attr_groups[] = {
+ &ctcm_group_attr_group,
+ NULL,
+};
+
+/*
+ * Module related routines
+ */
+
+/*
+ * Prepare to be unloaded. Free IRQ's and release all resources.
+ * This is called just before this module is unloaded. It is
+ * not called, if the usage count is !0, so we don't need to check
+ * for that.
+ */
+static void __exit ctcm_exit(void)
+{
+ driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
+ ccwgroup_driver_unregister(&ctcm_group_driver);
+ ccw_driver_unregister(&ctcm_ccw_driver);
+ root_device_unregister(ctcm_root_dev);
+ ctcm_unregister_dbf_views();
+ pr_info("CTCM driver unloaded\n");
+}
+
+/*
+ * Print Banner.
+ */
+static void print_banner(void)
+{
+ pr_info("CTCM driver initialized\n");
+}
+
+/**
+ * Initialize module.
+ * This is called just after the module is loaded.
+ *
+ * returns 0 on success, !0 on error.
+ */
+static int __init ctcm_init(void)
+{
+ int ret;
+
+ channels = NULL;
+
+ ret = ctcm_register_dbf_views();
+ if (ret)
+ goto out_err;
+ ctcm_root_dev = root_device_register("ctcm");
+ ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
+ if (ret)
+ goto register_err;
+ ret = ccw_driver_register(&ctcm_ccw_driver);
+ if (ret)
+ goto ccw_err;
+ ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
+ ret = ccwgroup_driver_register(&ctcm_group_driver);
+ if (ret)
+ goto ccwgroup_err;
+ print_banner();
+ return 0;
+
+ccwgroup_err:
+ ccw_driver_unregister(&ctcm_ccw_driver);
+ccw_err:
+ root_device_unregister(ctcm_root_dev);
+register_err:
+ ctcm_unregister_dbf_views();
+out_err:
+ pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
+ __func__, ret);
+ return ret;
+}
+
+module_init(ctcm_init);
+module_exit(ctcm_exit);
+
+MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
+MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
+MODULE_LICENSE("GPL");
+