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linux/drivers/s390/net/ctcm_main.c
Joel A. Fowler e2fc8cb4fe ctcm: fix minor findings from code analysis tool 
From: Ursula Braun <ursula.braun@de.ibm.com>

This patch fixes problems in the ctcm driver identified by
static code analysis:
o remove an unnecessary always true condition in ctcm_unpack_skb
o remove duplicate assignment in ctc_mpc_alloc_channel
o remove an unnecessary always true condition in ctcmpc_send_sweep_resp
o remove duplicate initialization in ctcmpc_unpack_skb
o shorten if condition in mpc_action_go_inop
o remove INOP event if mpc group is undefined in mpc_action_doxid7

Signed-off-by: Joel A. Fowler <fowlerja@us.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-24 15:24:31 -07:00

1763 lines
44 KiB
C
Raw Blame History

/*
* drivers/s390/net/ctcm_main.c
*
* Copyright IBM Corp. 2001, 2007
* 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 "cu3088.h"
#include "ctcm_fsms.h"
#include "ctcm_main.h"
/* Some common global variables */
/*
* 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);
dev->last_rx = jiffies;
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 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 == 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) == 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) == 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[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[READ];
grp->sweep_req_pend_num = grp->active_channels[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 */
__u16 block_len;
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);
block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
/*
* 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 0;
}
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 0;
}
/*
* 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 0;
}
if (ctcm_test_and_set_busy(dev))
return NETDEV_TX_BUSY;
dev->trans_start = jiffies;
if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0)
return NETDEV_TX_BUSY;
return 0;
}
/* 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[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 0; /* 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[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");
kfree(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");
kfree(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[READ]->cdev == cdev)
ch = priv->channel[READ];
else if (priv->channel[WRITE]->cdev == cdev)
ch = priv->channel[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 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 = (struct th_header *)
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 = (struct ccw1 *)
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 channel_types get_channel_type(struct ccw_device_id *id)
{
enum channel_types type;
type = (enum channel_types)id->driver_info;
if (type == channel_type_ficon)
type = 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 channel_types type;
struct ctcm_priv *priv;
struct net_device *dev;
struct ccw_device *cdev0;
struct ccw_device *cdev1;
int ret;
priv = dev_get_drvdata(&cgdev->dev);
if (!priv)
return -ENODEV;
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)
return ret;
ret = add_channel(cdev1, type, priv);
if (ret)
return ret;
ret = ccw_device_set_online(cdev0);
if (ret != 0) {
/* may be ok to fail now - can be done later */
CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
"%s(%s) set_online rc=%d",
CTCM_FUNTAIL, read_id, ret);
}
ret = ccw_device_set_online(cdev1);
if (ret != 0) {
/* may be ok to fail now - can be done later */
CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
"%s(%s) set_online rc=%d",
CTCM_FUNTAIL, write_id, ret);
}
dev = ctcm_init_netdevice(priv);
if (dev == NULL)
goto out;
for (direction = READ; direction <= WRITE; direction++) {
priv->channel[direction] =
channel_get(type, direction == READ ? read_id : write_id,
direction);
if (priv->channel[direction] == NULL) {
if (direction == WRITE)
channel_free(priv->channel[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))
goto out_dev;
if (ctcm_add_attributes(&cgdev->dev)) {
unregister_netdev(dev);
goto out_dev;
}
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[READ]->id,
priv->channel[WRITE]->id, priv->protocol);
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
"setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
priv->channel[READ]->id,
priv->channel[WRITE]->id, priv->protocol);
return 0;
out_dev:
ctcm_free_netdevice(dev);
out:
ccw_device_set_offline(cgdev->cdev[1]);
ccw_device_set_offline(cgdev->cdev[0]);
return -ENODEV;
}
/**
* 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[READ]) {
dev = priv->channel[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[READ]);
} else
dev = NULL;
if (priv->channel[WRITE])
channel_free(priv->channel[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[READ])
channel_remove(priv->channel[READ]);
if (priv->channel[WRITE])
channel_remove(priv->channel[WRITE]);
priv->channel[READ] = priv->channel[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 %s, r/w = %s/%s, proto : %d",
priv->channel[READ]->netdev->name,
priv->channel[READ]->id, priv->channel[WRITE]->id,
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 struct ccwgroup_driver ctcm_group_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,
};
/*
* 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)
{
unregister_cu3088_discipline(&ctcm_group_driver);
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) {
return ret;
}
ret = register_cu3088_discipline(&ctcm_group_driver);
if (ret) {
ctcm_unregister_dbf_views();
pr_err("%s / register_cu3088_discipline failed, ret = %d\n",
__func__, ret);
return ret;
}
print_banner();
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");
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