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linux-zen-desktop/drivers/s390/net/ctcm_mpc.c

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Initial commit
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2004, 2007
* Authors: Belinda Thompson (belindat@us.ibm.com)
* Andy Richter (richtera@us.ibm.com)
* Peter Tiedemann (ptiedem@de.ibm.com)
*/
/*
This module exports functions to be used by CCS:
EXPORT_SYMBOL(ctc_mpc_alloc_channel);
EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
EXPORT_SYMBOL(ctc_mpc_flow_control);
*/
#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/sched.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/proc_fs.h>
#include <linux/ip.h>
#include <linux/if_arp.h>
#include <linux/tcp.h>
#include <linux/skbuff.h>
#include <linux/ctype.h>
#include <linux/netdevice.h>
#include <net/dst.h>
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#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
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#include <linux/wait.h>
#include <linux/moduleparam.h>
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#include <asm/ccwdev.h>
#include <asm/ccwgroup.h>
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#include <asm/idals.h>
#include "ctcm_main.h"
#include "ctcm_mpc.h"
#include "ctcm_fsms.h"
static const struct xid2 init_xid = {
.xid2_type_id = XID_FM2,
.xid2_len = 0x45,
.xid2_adj_id = 0,
.xid2_rlen = 0x31,
.xid2_resv1 = 0,
.xid2_flag1 = 0,
.xid2_fmtt = 0,
.xid2_flag4 = 0x80,
.xid2_resv2 = 0,
.xid2_tgnum = 0,
.xid2_sender_id = 0,
.xid2_flag2 = 0,
.xid2_option = XID2_0,
.xid2_resv3 = "\x00",
.xid2_resv4 = 0,
.xid2_dlc_type = XID2_READ_SIDE,
.xid2_resv5 = 0,
.xid2_mpc_flag = 0,
.xid2_resv6 = 0,
.xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),
};
static const struct th_header thnorm = {
.th_seg = 0x00,
.th_ch_flag = TH_IS_XID,
.th_blk_flag = TH_DATA_IS_XID,
.th_is_xid = 0x01,
.th_seq_num = 0x00000000,
};
static const struct th_header thdummy = {
.th_seg = 0x00,
.th_ch_flag = 0x00,
.th_blk_flag = TH_DATA_IS_XID,
.th_is_xid = 0x01,
.th_seq_num = 0x00000000,
};
/*
* Definition of one MPC group
*/
/*
* Compatibility macros for busy handling
* of network devices.
*/
static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
/*
* MPC Group state machine actions (static prototypes)
*/
static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
static int mpc_validate_xid(struct mpcg_info *mpcginfo);
static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
#ifdef DEBUGDATA
/*-------------------------------------------------------------------*
* Dump buffer format *
* *
*--------------------------------------------------------------------*/
void ctcmpc_dumpit(char *buf, int len)
{
__u32 ct, sw, rm, dup;
char *ptr, *rptr;
char tbuf[82], tdup[82];
char addr[22];
char boff[12];
char bhex[82], duphex[82];
char basc[40];
sw = 0;
rptr = ptr = buf;
rm = 16;
duphex[0] = 0x00;
dup = 0;
for (ct = 0; ct < len; ct++, ptr++, rptr++) {
if (sw == 0) {
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scnprintf(addr, sizeof(addr), "%16.16llx", (__u64)rptr);
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scnprintf(boff, sizeof(boff), "%4.4X", (__u32)ct);
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bhex[0] = '\0';
basc[0] = '\0';
}
if ((sw == 4) || (sw == 12))
strcat(bhex, " ");
if (sw == 8)
strcat(bhex, " ");
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scnprintf(tbuf, sizeof(tbuf), "%2.2llX", (__u64)*ptr);
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tbuf[2] = '\0';
strcat(bhex, tbuf);
if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
basc[sw] = *ptr;
else
basc[sw] = '.';
basc[sw+1] = '\0';
sw++;
rm--;
if (sw != 16)
continue;
if ((strcmp(duphex, bhex)) != 0) {
if (dup != 0) {
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scnprintf(tdup, sizeof(tdup),
"Duplicate as above to %s", addr);
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ctcm_pr_debug(" --- %s ---\n",
tdup);
}
ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
addr, boff, bhex, basc);
dup = 0;
strcpy(duphex, bhex);
} else
dup++;
sw = 0;
rm = 16;
} /* endfor */
if (sw != 0) {
for ( ; rm > 0; rm--, sw++) {
if ((sw == 4) || (sw == 12))
strcat(bhex, " ");
if (sw == 8)
strcat(bhex, " ");
strcat(bhex, " ");
strcat(basc, " ");
}
if (dup != 0) {
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scnprintf(tdup, sizeof(tdup),
"Duplicate as above to %s", addr);
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ctcm_pr_debug(" --- %s ---\n", tdup);
}
ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
addr, boff, bhex, basc);
} else {
if (dup >= 1) {
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scnprintf(tdup, sizeof(tdup),
"Duplicate as above to %s", addr);
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ctcm_pr_debug(" --- %s ---\n", tdup);
}
if (dup != 0) {
ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
addr, boff, bhex, basc);
}
}
return;
} /* end of ctcmpc_dumpit */
#endif
#ifdef DEBUGDATA
/*
* Dump header and first 16 bytes of an sk_buff for debugging purposes.
*
* skb The sk_buff to dump.
* offset Offset relative to skb-data, where to start the dump.
*/
void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
{
__u8 *p = skb->data;
struct th_header *header;
struct pdu *pheader;
int bl = skb->len;
int i;
if (p == NULL)
return;
p += offset;
header = (struct th_header *)p;
ctcm_pr_debug("dump:\n");
ctcm_pr_debug("skb len=%d \n", skb->len);
if (skb->len > 2) {
switch (header->th_ch_flag) {
case TH_HAS_PDU:
break;
case 0x00:
case TH_IS_XID:
if ((header->th_blk_flag == TH_DATA_IS_XID) &&
(header->th_is_xid == 0x01))
goto dumpth;
case TH_SWEEP_REQ:
goto dumpth;
case TH_SWEEP_RESP:
goto dumpth;
default:
break;
}
pheader = (struct pdu *)p;
ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
pheader->pdu_offset, pheader->pdu_offset);
ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
goto dumpdata;
dumpth:
ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
ctcm_pr_debug("th->type : %s\n",
(header->th_is_xid) ? "DATA" : "XID");
ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
}
dumpdata:
if (bl > 32)
bl = 32;
ctcm_pr_debug("data: ");
for (i = 0; i < bl; i++)
ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
ctcm_pr_debug("\n");
}
#endif
static struct net_device *ctcmpc_get_dev(int port_num)
{
char device[20];
struct net_device *dev;
struct ctcm_priv *priv;
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scnprintf(device, sizeof(device), "%s%i", MPC_DEVICE_NAME, port_num);
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dev = __dev_get_by_name(&init_net, device);
if (dev == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s: Device not found by name: %s",
CTCM_FUNTAIL, device);
return NULL;
}
priv = dev->ml_priv;
if (priv == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): dev->ml_priv is NULL",
CTCM_FUNTAIL, device);
return NULL;
}
if (priv->mpcg == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): priv->mpcg is NULL",
CTCM_FUNTAIL, device);
return NULL;
}
return dev;
}
/*
* ctc_mpc_alloc_channel
* (exported interface)
*
* Device Initialization :
* ACTPATH driven IO operations
*/
int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
{
struct net_device *dev;
struct mpc_group *grp;
struct ctcm_priv *priv;
dev = ctcmpc_get_dev(port_num);
if (dev == NULL)
return 1;
priv = dev->ml_priv;
grp = priv->mpcg;
grp->allochanfunc = callback;
grp->port_num = port_num;
grp->port_persist = 1;
CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
"%s(%s): state=%s",
CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
switch (fsm_getstate(grp->fsm)) {
case MPCG_STATE_INOP:
/* Group is in the process of terminating */
grp->alloc_called = 1;
break;
case MPCG_STATE_RESET:
/* MPC Group will transition to state */
/* MPCG_STATE_XID2INITW iff the minimum number */
/* of 1 read and 1 write channel have successfully*/
/* activated */
/*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
if (callback)
grp->send_qllc_disc = 1;
fallthrough;
case MPCG_STATE_XID0IOWAIT:
fsm_deltimer(&grp->timer);
grp->outstanding_xid2 = 0;
grp->outstanding_xid7 = 0;
grp->outstanding_xid7_p2 = 0;
grp->saved_xid2 = NULL;
if (callback)
ctcm_open(dev);
fsm_event(priv->fsm, DEV_EVENT_START, dev);
break;
case MPCG_STATE_READY:
/* XID exchanges completed after PORT was activated */
/* Link station already active */
/* Maybe timing issue...retry callback */
grp->allocchan_callback_retries++;
if (grp->allocchan_callback_retries < 4) {
if (grp->allochanfunc)
grp->allochanfunc(grp->port_num,
grp->group_max_buflen);
} else {
/* there are problems...bail out */
/* there may be a state mismatch so restart */
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
grp->allocchan_callback_retries = 0;
}
break;
}
return 0;
}
EXPORT_SYMBOL(ctc_mpc_alloc_channel);
/*
* ctc_mpc_establish_connectivity
* (exported interface)
*/
void ctc_mpc_establish_connectivity(int port_num,
void (*callback)(int, int, int))
{
struct net_device *dev;
struct mpc_group *grp;
struct ctcm_priv *priv;
struct channel *rch, *wch;
dev = ctcmpc_get_dev(port_num);
if (dev == NULL)
return;
priv = dev->ml_priv;
grp = priv->mpcg;
rch = priv->channel[CTCM_READ];
wch = priv->channel[CTCM_WRITE];
CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
"%s(%s): state=%s",
CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
grp->estconnfunc = callback;
grp->port_num = port_num;
switch (fsm_getstate(grp->fsm)) {
case MPCG_STATE_READY:
/* XID exchanges completed after PORT was activated */
/* Link station already active */
/* Maybe timing issue...retry callback */
fsm_deltimer(&grp->timer);
grp->estconn_callback_retries++;
if (grp->estconn_callback_retries < 4) {
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, 0,
grp->group_max_buflen);
grp->estconnfunc = NULL;
}
} else {
/* there are problems...bail out */
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
grp->estconn_callback_retries = 0;
}
break;
case MPCG_STATE_INOP:
case MPCG_STATE_RESET:
/* MPC Group is not ready to start XID - min num of */
/* 1 read and 1 write channel have not been acquired*/
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): REJECTED - inactive channels",
CTCM_FUNTAIL, dev->name);
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, -1, 0);
grp->estconnfunc = NULL;
}
break;
case MPCG_STATE_XID2INITW:
/* alloc channel was called but no XID exchange */
/* has occurred. initiate xside XID exchange */
/* make sure yside XID0 processing has not started */
if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
(fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): ABORT - PASSIVE XID",
CTCM_FUNTAIL, dev->name);
break;
}
grp->send_qllc_disc = 1;
fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
fsm_deltimer(&grp->timer);
fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
MPCG_EVENT_TIMER, dev);
grp->outstanding_xid7 = 0;
grp->outstanding_xid7_p2 = 0;
grp->saved_xid2 = NULL;
if ((rch->in_mpcgroup) &&
(fsm_getstate(rch->fsm) == CH_XID0_PENDING))
fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
else {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): RX-%s not ready for ACTIVE XID0",
CTCM_FUNTAIL, dev->name, rch->id);
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, -1, 0);
grp->estconnfunc = NULL;
}
fsm_deltimer(&grp->timer);
goto done;
}
if ((wch->in_mpcgroup) &&
(fsm_getstate(wch->fsm) == CH_XID0_PENDING))
fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
else {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): WX-%s not ready for ACTIVE XID0",
CTCM_FUNTAIL, dev->name, wch->id);
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, -1, 0);
grp->estconnfunc = NULL;
}
fsm_deltimer(&grp->timer);
goto done;
}
break;
case MPCG_STATE_XID0IOWAIT:
/* already in active XID negotiations */
default:
break;
}
done:
CTCM_PR_DEBUG("Exit %s()\n", __func__);
return;
}
EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
/*
* ctc_mpc_dealloc_ch
* (exported interface)
*/
void ctc_mpc_dealloc_ch(int port_num)
{
struct net_device *dev;
struct ctcm_priv *priv;
struct mpc_group *grp;
dev = ctcmpc_get_dev(port_num);
if (dev == NULL)
return;
priv = dev->ml_priv;
grp = priv->mpcg;
CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
"%s: %s: refcount = %d\n",
CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
fsm_deltimer(&priv->restart_timer);
grp->channels_terminating = 0;
fsm_deltimer(&grp->timer);
grp->allochanfunc = NULL;
grp->estconnfunc = NULL;
grp->port_persist = 0;
grp->send_qllc_disc = 0;
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
ctcm_close(dev);
return;
}
EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
/*
* ctc_mpc_flow_control
* (exported interface)
*/
void ctc_mpc_flow_control(int port_num, int flowc)
{
struct ctcm_priv *priv;
struct mpc_group *grp;
struct net_device *dev;
struct channel *rch;
int mpcg_state;
dev = ctcmpc_get_dev(port_num);
if (dev == NULL)
return;
priv = dev->ml_priv;
grp = priv->mpcg;
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
"%s: %s: flowc = %d",
CTCM_FUNTAIL, dev->name, flowc);
rch = priv->channel[CTCM_READ];
mpcg_state = fsm_getstate(grp->fsm);
switch (flowc) {
case 1:
if (mpcg_state == MPCG_STATE_FLOWC)
break;
if (mpcg_state == MPCG_STATE_READY) {
if (grp->flow_off_called == 1)
grp->flow_off_called = 0;
else
fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
break;
}
break;
case 0:
if (mpcg_state == MPCG_STATE_FLOWC) {
fsm_newstate(grp->fsm, MPCG_STATE_READY);
/* ensure any data that has accumulated */
/* on the io_queue will now be sen t */
tasklet_schedule(&rch->ch_tasklet);
}
/* possible race condition */
if (mpcg_state == MPCG_STATE_READY) {
grp->flow_off_called = 1;
break;
}
break;
}
}
EXPORT_SYMBOL(ctc_mpc_flow_control);
static int mpc_send_qllc_discontact(struct net_device *);
/*
* helper function of ctcmpc_unpack_skb
*/
static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
{
struct channel *rch = mpcginfo->ch;
struct net_device *dev = rch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
struct channel *ch = priv->channel[CTCM_WRITE];
CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
grp->sweep_rsp_pend_num--;
if ((grp->sweep_req_pend_num == 0) &&
(grp->sweep_rsp_pend_num == 0)) {
fsm_deltimer(&ch->sweep_timer);
grp->in_sweep = 0;
rch->th_seq_num = 0x00;
ch->th_seq_num = 0x00;
ctcm_clear_busy_do(dev);
}
return;
}
/*
* helper function of mpc_rcvd_sweep_req
* which is a helper of ctcmpc_unpack_skb
*/
static void ctcmpc_send_sweep_resp(struct channel *rch)
{
struct net_device *dev = rch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
struct th_sweep *header;
struct sk_buff *sweep_skb;
struct channel *ch = priv->channel[CTCM_WRITE];
CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
if (sweep_skb == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): sweep_skb allocation ERROR\n",
CTCM_FUNTAIL, rch->id);
goto done;
}
header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
header->th.th_ch_flag = TH_SWEEP_RESP;
header->sw.th_last_seq = ch->th_seq_num;
netif_trans_update(dev);
skb_queue_tail(&ch->sweep_queue, sweep_skb);
fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
return;
done:
grp->in_sweep = 0;
ctcm_clear_busy_do(dev);
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
return;
}
/*
* helper function of ctcmpc_unpack_skb
*/
static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
{
struct channel *rch = mpcginfo->ch;
struct net_device *dev = rch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
struct channel *ch = priv->channel[CTCM_WRITE];
if (do_debug)
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
" %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
if (grp->in_sweep == 0) {
grp->in_sweep = 1;
ctcm_test_and_set_busy(dev);
grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
}
CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
grp->sweep_req_pend_num--;
ctcmpc_send_sweep_resp(ch);
kfree(mpcginfo);
return;
}
/*
* MPC Group Station FSM definitions
*/
static const char *mpcg_event_names[] = {
[MPCG_EVENT_INOP] = "INOP Condition",
[MPCG_EVENT_DISCONC] = "Discontact Received",
[MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
[MPCG_EVENT_XID2] = "XID2 Received",
[MPCG_EVENT_XID2DONE] = "XID0 Complete",
[MPCG_EVENT_XID7DONE] = "XID7 Complete",
[MPCG_EVENT_TIMER] = "XID Setup Timer",
[MPCG_EVENT_DOIO] = "XID DoIO",
};
static const char *mpcg_state_names[] = {
[MPCG_STATE_RESET] = "Reset",
[MPCG_STATE_INOP] = "INOP",
[MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
[MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
[MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
[MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
[MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
[MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
[MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
[MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
[MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
[MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
[MPCG_STATE_READY] = "READY",
};
/*
* The MPC Group Station FSM
* 22 events
*/
static const fsm_node mpcg_fsm[] = {
{ MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
{ MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
{ MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
{ MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
{ MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
{ MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
{ MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
{ MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
{ MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
{ MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
{ MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
{ MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
{ MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
{ MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
{ MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
{ MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
{ MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
{ MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
{ MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
{ MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
{ MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
{ MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
{ MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
{ MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
{ MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
};
static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
{
struct net_device *dev = arg;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
if (grp == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): No MPC group",
CTCM_FUNTAIL, dev->name);
return;
}
fsm_deltimer(&grp->timer);
if (grp->saved_xid2->xid2_flag2 == 0x40) {
priv->xid->xid2_flag2 = 0x00;
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, 1,
grp->group_max_buflen);
grp->estconnfunc = NULL;
} else if (grp->allochanfunc)
grp->send_qllc_disc = 1;
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): fails",
CTCM_FUNTAIL, dev->name);
return;
}
grp->port_persist = 1;
grp->out_of_sequence = 0;
grp->estconn_called = 0;
tasklet_hi_schedule(&grp->mpc_tasklet2);
return;
}
/*
* helper of ctcm_init_netdevice
* CTCM_PROTO_MPC only
*/
void mpc_group_ready(unsigned long adev)
{
struct net_device *dev = (struct net_device *)adev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
struct channel *ch = NULL;
if (grp == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): No MPC group",
CTCM_FUNTAIL, dev->name);
return;
}
CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
"%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
fsm_newstate(grp->fsm, MPCG_STATE_READY);
/* Put up a read on the channel */
ch = priv->channel[CTCM_READ];
ch->pdu_seq = 0;
CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
__func__, ch->pdu_seq);
ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
/* Put the write channel in idle state */
ch = priv->channel[CTCM_WRITE];
if (ch->collect_len > 0) {
spin_lock(&ch->collect_lock);
ctcm_purge_skb_queue(&ch->collect_queue);
ch->collect_len = 0;
spin_unlock(&ch->collect_lock);
}
ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
ctcm_clear_busy(dev);
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, 0,
grp->group_max_buflen);
grp->estconnfunc = NULL;
} else if (grp->allochanfunc) {
grp->allochanfunc(grp->port_num, grp->group_max_buflen);
}
grp->send_qllc_disc = 1;
grp->changed_side = 0;
return;
}
/*
* Increment the MPC Group Active Channel Counts
* helper of dev_action (called from channel fsm)
*/
void mpc_channel_action(struct channel *ch, int direction, int action)
{
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
if (grp == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): No MPC group",
CTCM_FUNTAIL, dev->name);
return;
}
CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
"%s: %i / Grp:%s total_channels=%i, active_channels: "
"read=%i, write=%i\n", __func__, action,
fsm_getstate_str(grp->fsm), grp->num_channel_paths,
grp->active_channels[CTCM_READ],
grp->active_channels[CTCM_WRITE]);
if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
grp->num_channel_paths++;
grp->active_channels[direction]++;
grp->outstanding_xid2++;
ch->in_mpcgroup = 1;
if (ch->xid_skb != NULL)
dev_kfree_skb_any(ch->xid_skb);
ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
GFP_ATOMIC | GFP_DMA);
if (ch->xid_skb == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): Couldn't alloc ch xid_skb\n",
CTCM_FUNTAIL, dev->name);
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
return;
}
ch->xid_skb_data = ch->xid_skb->data;
ch->xid_th = (struct th_header *)ch->xid_skb->data;
skb_put(ch->xid_skb, TH_HEADER_LENGTH);
ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
skb_put(ch->xid_skb, XID2_LENGTH);
ch->xid_id = skb_tail_pointer(ch->xid_skb);
ch->xid_skb->data = ch->xid_skb_data;
skb_reset_tail_pointer(ch->xid_skb);
ch->xid_skb->len = 0;
skb_put_data(ch->xid_skb, grp->xid_skb->data,
grp->xid_skb->len);
ch->xid->xid2_dlc_type =
((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
? XID2_READ_SIDE : XID2_WRITE_SIDE);
if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
ch->xid->xid2_buf_len = 0x00;
ch->xid_skb->data = ch->xid_skb_data;
skb_reset_tail_pointer(ch->xid_skb);
ch->xid_skb->len = 0;
fsm_newstate(ch->fsm, CH_XID0_PENDING);
if ((grp->active_channels[CTCM_READ] > 0) &&
(grp->active_channels[CTCM_WRITE] > 0) &&
(fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
"%s: %s: MPC GROUP CHANNELS ACTIVE\n",
__func__, dev->name);
}
} else if ((action == MPC_CHANNEL_REMOVE) &&
(ch->in_mpcgroup == 1)) {
ch->in_mpcgroup = 0;
grp->num_channel_paths--;
grp->active_channels[direction]--;
if (ch->xid_skb != NULL)
dev_kfree_skb_any(ch->xid_skb);
ch->xid_skb = NULL;
if (grp->channels_terminating)
goto done;
if (((grp->active_channels[CTCM_READ] == 0) &&
(grp->active_channels[CTCM_WRITE] > 0))
|| ((grp->active_channels[CTCM_WRITE] == 0) &&
(grp->active_channels[CTCM_READ] > 0)))
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
}
done:
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
"exit %s: %i / Grp:%s total_channels=%i, active_channels: "
"read=%i, write=%i\n", __func__, action,
fsm_getstate_str(grp->fsm), grp->num_channel_paths,
grp->active_channels[CTCM_READ],
grp->active_channels[CTCM_WRITE]);
CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
}
/*
* Unpack a just received skb and hand it over to
* upper layers.
* special MPC version of unpack_skb.
*
* ch The channel where this skb has been received.
* pskb The received skb.
*/
static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
{
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
struct pdu *curr_pdu;
struct mpcg_info *mpcginfo;
struct th_header *header = NULL;
struct th_sweep *sweep = NULL;
int pdu_last_seen = 0;
__u32 new_len;
struct sk_buff *skb;
int skblen;
int sendrc = 0;
CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
__func__, dev->name, smp_processor_id(), ch->id);
header = (struct th_header *)pskb->data;
if ((header->th_seg == 0) &&
(header->th_ch_flag == 0) &&
(header->th_blk_flag == 0) &&
(header->th_seq_num == 0))
/* nothing for us */ goto done;
CTCM_PR_DBGDATA("%s: th_header\n", __func__);
CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
pskb->dev = dev;
pskb->ip_summed = CHECKSUM_UNNECESSARY;
skb_pull(pskb, TH_HEADER_LENGTH);
if (likely(header->th_ch_flag == TH_HAS_PDU)) {
CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
(header->th_seq_num != ch->th_seq_num + 1) &&
(ch->th_seq_num != 0))) {
/* This is NOT the next segment *
* we are not the correct race winner *
* go away and let someone else win *
* BUT..this only applies if xid negot *
* is done *
*/
grp->out_of_sequence += 1;
__skb_push(pskb, TH_HEADER_LENGTH);
skb_queue_tail(&ch->io_queue, pskb);
CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
"got:%08x\n", __func__,
ch->th_seq_num + 1, header->th_seq_num);
return;
}
grp->out_of_sequence = 0;
ch->th_seq_num = header->th_seq_num;
CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
__func__, ch->th_seq_num);
if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
goto done;
while ((pskb->len > 0) && !pdu_last_seen) {
curr_pdu = (struct pdu *)pskb->data;
CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
__func__, pskb->len);
skb_pull(pskb, PDU_HEADER_LENGTH);
if (curr_pdu->pdu_flag & PDU_LAST)
pdu_last_seen = 1;
if (curr_pdu->pdu_flag & PDU_CNTL)
pskb->protocol = htons(ETH_P_SNAP);
else
pskb->protocol = htons(ETH_P_SNA_DIX);
if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): Dropping packet with "
"illegal siize %d",
CTCM_FUNTAIL, dev->name, pskb->len);
priv->stats.rx_dropped++;
priv->stats.rx_length_errors++;
goto done;
}
skb_reset_mac_header(pskb);
new_len = curr_pdu->pdu_offset;
CTCM_PR_DBGDATA("%s: new_len: %04x \n",
__func__, new_len);
if ((new_len == 0) || (new_len > pskb->len)) {
/* should never happen */
/* pskb len must be hosed...bail out */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): non valid pdu_offset: %04x",
/* "data may be lost", */
CTCM_FUNTAIL, dev->name, new_len);
goto done;
}
skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
if (!skb) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): MEMORY allocation error",
CTCM_FUNTAIL, dev->name);
priv->stats.rx_dropped++;
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
goto done;
}
skb_put_data(skb, pskb->data, new_len);
skb_reset_mac_header(skb);
skb->dev = pskb->dev;
skb->protocol = pskb->protocol;
skb->ip_summed = CHECKSUM_UNNECESSARY;
*((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
ch->pdu_seq++;
if (do_debug_data) {
ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
__func__, ch->pdu_seq);
ctcm_pr_debug("%s: skb:%0lx "
"skb len: %d \n", __func__,
(unsigned long)skb, skb->len);
ctcm_pr_debug("%s: up to 32 bytes "
"of pdu_data sent\n", __func__);
ctcmpc_dump32((char *)skb->data, skb->len);
}
skblen = skb->len;
sendrc = netif_rx(skb);
priv->stats.rx_packets++;
priv->stats.rx_bytes += skblen;
skb_pull(pskb, new_len); /* point to next PDU */
}
} else {
mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
if (mpcginfo == NULL)
goto done;
mpcginfo->ch = ch;
mpcginfo->th = header;
mpcginfo->skb = pskb;
CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
__func__);
/* it's a sweep? */
sweep = (struct th_sweep *)pskb->data;
mpcginfo->sweep = sweep;
if (header->th_ch_flag == TH_SWEEP_REQ)
mpc_rcvd_sweep_req(mpcginfo);
else if (header->th_ch_flag == TH_SWEEP_RESP)
mpc_rcvd_sweep_resp(mpcginfo);
else if (header->th_blk_flag == TH_DATA_IS_XID) {
struct xid2 *thisxid = (struct xid2 *)pskb->data;
skb_pull(pskb, XID2_LENGTH);
mpcginfo->xid = thisxid;
fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
} else if (header->th_blk_flag == TH_DISCONTACT)
fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
else if (header->th_seq_num != 0) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): control pkt expected\n",
CTCM_FUNTAIL, dev->name);
priv->stats.rx_dropped++;
/* mpcginfo only used for non-data transfers */
if (do_debug_data)
ctcmpc_dump_skb(pskb, -8);
}
kfree(mpcginfo);
}
done:
dev_kfree_skb_any(pskb);
if (sendrc == NET_RX_DROP) {
dev_warn(&dev->dev,
"The network backlog for %s is exceeded, "
"package dropped\n", __func__);
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
}
CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
__func__, dev->name, ch, ch->id);
}
/*
* tasklet helper for mpc's skb unpacking.
*
* ch The channel to work on.
* Allow flow control back pressure to occur here.
* Throttling back channel can result in excessive
* channel inactivity and system deact of channel
*/
void ctcmpc_bh(unsigned long thischan)
{
struct channel *ch = (struct channel *)thischan;
struct sk_buff *skb;
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
dev->name, smp_processor_id(), __func__, ch->id);
/* caller has requested driver to throttle back */
while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
(skb = skb_dequeue(&ch->io_queue))) {
ctcmpc_unpack_skb(ch, skb);
if (grp->out_of_sequence > 20) {
/* assume data loss has occurred if */
/* missing seq_num for extended */
/* period of time */
grp->out_of_sequence = 0;
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
break;
}
if (skb == skb_peek(&ch->io_queue))
break;
}
CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
__func__, dev->name, ch, ch->id);
return;
}
/*
* MPC Group Initializations
*/
struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
{
struct mpc_group *grp;
CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
"Enter %s(%p)", CTCM_FUNTAIL, priv);
grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
if (grp == NULL)
return NULL;
grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
mpcg_fsm_len, GFP_KERNEL);
if (grp->fsm == NULL) {
kfree(grp);
return NULL;
}
fsm_newstate(grp->fsm, MPCG_STATE_RESET);
fsm_settimer(grp->fsm, &grp->timer);
grp->xid_skb =
__dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
if (grp->xid_skb == NULL) {
kfree_fsm(grp->fsm);
kfree(grp);
return NULL;
}
/* base xid for all channels in group */
grp->xid_skb_data = grp->xid_skb->data;
grp->xid_th = (struct th_header *)grp->xid_skb->data;
skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
grp->xid->xid2_adj_id = jiffies | 0xfff00000;
grp->xid->xid2_sender_id = jiffies;
grp->xid_id = skb_tail_pointer(grp->xid_skb);
skb_put_data(grp->xid_skb, "VTAM", 4);
grp->rcvd_xid_skb =
__dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
if (grp->rcvd_xid_skb == NULL) {
kfree_fsm(grp->fsm);
dev_kfree_skb(grp->xid_skb);
kfree(grp);
return NULL;
}
grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
grp->saved_xid2 = NULL;
priv->xid = grp->xid;
priv->mpcg = grp;
return grp;
}
/*
* The MPC Group Station FSM
*/
/*
* MPC Group Station FSM actions
* CTCM_PROTO_MPC only
*/
/*
* NOP action for statemachines
*/
static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
{
}
/*
* invoked when the device transitions to dev_stopped
* MPC will stop each individual channel if a single XID failure
* occurs, or will intitiate all channels be stopped if a GROUP
* level failure occurs.
*/
static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
{
struct net_device *dev = arg;
struct ctcm_priv *priv;
struct mpc_group *grp;
struct channel *wch;
CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
priv = dev->ml_priv;
grp = priv->mpcg;
grp->flow_off_called = 0;
fsm_deltimer(&grp->timer);
if (grp->channels_terminating)
return;
grp->channels_terminating = 1;
grp->saved_state = fsm_getstate(grp->fsm);
fsm_newstate(grp->fsm, MPCG_STATE_INOP);
if (grp->saved_state > MPCG_STATE_XID7INITF)
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
"%s(%s): MPC GROUP INOPERATIVE",
CTCM_FUNTAIL, dev->name);
if ((grp->saved_state != MPCG_STATE_RESET) ||
/* dealloc_channel has been called */
(grp->port_persist == 0))
fsm_deltimer(&priv->restart_timer);
wch = priv->channel[CTCM_WRITE];
switch (grp->saved_state) {
case MPCG_STATE_RESET:
case MPCG_STATE_INOP:
case MPCG_STATE_XID2INITW:
case MPCG_STATE_XID0IOWAIT:
case MPCG_STATE_XID2INITX:
case MPCG_STATE_XID7INITW:
case MPCG_STATE_XID7INITX:
case MPCG_STATE_XID0IOWAIX:
case MPCG_STATE_XID7INITI:
case MPCG_STATE_XID7INITZ:
case MPCG_STATE_XID7INITF:
break;
case MPCG_STATE_FLOWC:
case MPCG_STATE_READY:
default:
tasklet_hi_schedule(&wch->ch_disc_tasklet);
}
grp->xid2_tgnum = 0;
grp->group_max_buflen = 0; /*min of all received */
grp->outstanding_xid2 = 0;
grp->outstanding_xid7 = 0;
grp->outstanding_xid7_p2 = 0;
grp->saved_xid2 = NULL;
grp->xidnogood = 0;
grp->changed_side = 0;
grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
skb_reset_tail_pointer(grp->rcvd_xid_skb);
grp->rcvd_xid_skb->len = 0;
grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
if (grp->send_qllc_disc == 1) {
grp->send_qllc_disc = 0;
mpc_send_qllc_discontact(dev);
}
/* DO NOT issue DEV_EVENT_STOP directly out of this code */
/* This can result in INOP of VTAM PU due to halting of */
/* outstanding IO which causes a sense to be returned */
/* Only about 3 senses are allowed and then IOS/VTAM will*/
/* become unreachable without manual intervention */
if ((grp->port_persist == 1) || (grp->alloc_called)) {
grp->alloc_called = 0;
fsm_deltimer(&priv->restart_timer);
fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
fsm_newstate(grp->fsm, MPCG_STATE_RESET);
if (grp->saved_state > MPCG_STATE_XID7INITF)
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
"%s(%s): MPC GROUP RECOVERY SCHEDULED",
CTCM_FUNTAIL, dev->name);
} else {
fsm_deltimer(&priv->restart_timer);
fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
fsm_newstate(grp->fsm, MPCG_STATE_RESET);
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
"%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
CTCM_FUNTAIL, dev->name);
}
}
/*
* Handle mpc group action timeout.
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*
* fi An instance of an mpc_group fsm.
* event The event, just happened.
* arg Generic pointer, casted from net_device * upon call.
*/
static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
{
struct net_device *dev = arg;
struct ctcm_priv *priv;
struct mpc_group *grp;
struct channel *wch;
struct channel *rch;
priv = dev->ml_priv;
grp = priv->mpcg;
wch = priv->channel[CTCM_WRITE];
rch = priv->channel[CTCM_READ];
switch (fsm_getstate(grp->fsm)) {
case MPCG_STATE_XID2INITW:
/* Unless there is outstanding IO on the */
/* channel just return and wait for ATTN */
/* interrupt to begin XID negotiations */
if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
(fsm_getstate(wch->fsm) == CH_XID0_PENDING))
break;
fallthrough;
default:
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
}
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
"%s: dev=%s exit",
CTCM_FUNTAIL, dev->name);
return;
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
{
struct mpcg_info *mpcginfo = arg;
struct channel *ch = mpcginfo->ch;
struct net_device *dev;
struct ctcm_priv *priv;
struct mpc_group *grp;
if (ch) {
dev = ch->netdev;
if (dev) {
priv = dev->ml_priv;
if (priv) {
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
"%s: %s: %s\n",
CTCM_FUNTAIL, dev->name, ch->id);
grp = priv->mpcg;
grp->send_qllc_disc = 1;
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
}
}
}
return;
}
/*
* MPC Group Station - not part of FSM
* CTCM_PROTO_MPC only
* called from add_channel in ctcm_main.c
*/
void mpc_action_send_discontact(unsigned long thischan)
{
int rc;
struct channel *ch = (struct channel *)thischan;
unsigned long saveflags = 0;
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
if (rc != 0) {
ctcm_ccw_check_rc(ch, rc, (char *)__func__);
}
return;
}
/*
* helper function of mpc FSM
* CTCM_PROTO_MPC only
* mpc_action_rcvd_xid7
*/
static int mpc_validate_xid(struct mpcg_info *mpcginfo)
{
struct channel *ch = mpcginfo->ch;
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
struct xid2 *xid = mpcginfo->xid;
int rc = 0;
__u64 our_id = 0;
__u64 their_id = 0;
int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
if (xid == NULL) {
rc = 1;
/* XID REJECTED: xid == NULL */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): xid = NULL",
CTCM_FUNTAIL, ch->id);
goto done;
}
CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
/*the received direction should be the opposite of ours */
if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
XID2_READ_SIDE) != xid->xid2_dlc_type) {
rc = 2;
/* XID REJECTED: r/w channel pairing mismatch */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): r/w channel pairing mismatch",
CTCM_FUNTAIL, ch->id);
goto done;
}
if (xid->xid2_dlc_type == XID2_READ_SIDE) {
CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
grp->group_max_buflen, xid->xid2_buf_len);
if (grp->group_max_buflen == 0 || grp->group_max_buflen >
xid->xid2_buf_len - len)
grp->group_max_buflen = xid->xid2_buf_len - len;
}
if (grp->saved_xid2 == NULL) {
grp->saved_xid2 =
(struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
skb_reset_tail_pointer(grp->rcvd_xid_skb);
grp->rcvd_xid_skb->len = 0;
/* convert two 32 bit numbers into 1 64 bit for id compare */
our_id = (__u64)priv->xid->xid2_adj_id;
our_id = our_id << 32;
our_id = our_id + priv->xid->xid2_sender_id;
their_id = (__u64)xid->xid2_adj_id;
their_id = their_id << 32;
their_id = their_id + xid->xid2_sender_id;
/* lower id assume the xside role */
if (our_id < their_id) {
grp->roll = XSIDE;
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
"%s(%s): WE HAVE LOW ID - TAKE XSIDE",
CTCM_FUNTAIL, ch->id);
} else {
grp->roll = YSIDE;
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
"%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
CTCM_FUNTAIL, ch->id);
}
} else {
if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
rc = 3;
/* XID REJECTED: xid flag byte4 mismatch */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): xid flag byte4 mismatch",
CTCM_FUNTAIL, ch->id);
}
if (xid->xid2_flag2 == 0x40) {
rc = 4;
/* XID REJECTED - xid NOGOOD */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): xid NOGOOD",
CTCM_FUNTAIL, ch->id);
}
if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
rc = 5;
/* XID REJECTED - Adjacent Station ID Mismatch */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): Adjacent Station ID Mismatch",
CTCM_FUNTAIL, ch->id);
}
if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
rc = 6;
/* XID REJECTED - Sender Address Mismatch */
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): Sender Address Mismatch",
CTCM_FUNTAIL, ch->id);
}
}
done:
if (rc) {
dev_warn(&dev->dev,
"The XID used in the MPC protocol is not valid, "
"rc = %d\n", rc);
priv->xid->xid2_flag2 = 0x40;
grp->saved_xid2->xid2_flag2 = 0x40;
}
return rc;
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
{
struct channel *ch = arg;
int rc = 0;
int gotlock = 0;
unsigned long saveflags = 0; /* avoids compiler warning with
spin_unlock_irqrestore */
CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
__func__, smp_processor_id(), ch, ch->id);
if (ctcm_checkalloc_buffer(ch))
goto done;
/*
* skb data-buffer referencing:
*/
ch->trans_skb->data = ch->trans_skb_data;
skb_reset_tail_pointer(ch->trans_skb);
ch->trans_skb->len = 0;
/* result of the previous 3 statements is NOT always
* already set after ctcm_checkalloc_buffer
* because of possible reuse of the trans_skb
*/
memset(ch->trans_skb->data, 0, 16);
ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
/* check is main purpose here: */
skb_put(ch->trans_skb, TH_HEADER_LENGTH);
ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
/* check is main purpose here: */
skb_put(ch->trans_skb, XID2_LENGTH);
ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
/* cleanup back to startpoint */
ch->trans_skb->data = ch->trans_skb_data;
skb_reset_tail_pointer(ch->trans_skb);
ch->trans_skb->len = 0;
/* non-checking rewrite of above skb data-buffer referencing: */
/*
memset(ch->trans_skb->data, 0, 16);
ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
*/
ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[8].count = 0;
ch->ccw[8].cda = 0x00;
if (!(ch->xid_th && ch->xid && ch->xid_id))
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
"%s(%s): xid_th=%p, xid=%p, xid_id=%p",
CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
if (side == XSIDE) {
/* mpc_action_xside_xid */
if (ch->xid_th == NULL)
goto done;
ch->ccw[9].cmd_code = CCW_CMD_WRITE;
ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[9].count = TH_HEADER_LENGTH;
ch->ccw[9].cda = virt_to_phys(ch->xid_th);
if (ch->xid == NULL)
goto done;
ch->ccw[10].cmd_code = CCW_CMD_WRITE;
ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[10].count = XID2_LENGTH;
ch->ccw[10].cda = virt_to_phys(ch->xid);
ch->ccw[11].cmd_code = CCW_CMD_READ;
ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[11].count = TH_HEADER_LENGTH;
ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
ch->ccw[12].cmd_code = CCW_CMD_READ;
ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[12].count = XID2_LENGTH;
ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
ch->ccw[13].cmd_code = CCW_CMD_READ;
ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
} else { /* side == YSIDE : mpc_action_yside_xid */
ch->ccw[9].cmd_code = CCW_CMD_READ;
ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[9].count = TH_HEADER_LENGTH;
ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
ch->ccw[10].cmd_code = CCW_CMD_READ;
ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[10].count = XID2_LENGTH;
ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
if (ch->xid_th == NULL)
goto done;
ch->ccw[11].cmd_code = CCW_CMD_WRITE;
ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[11].count = TH_HEADER_LENGTH;
ch->ccw[11].cda = virt_to_phys(ch->xid_th);
if (ch->xid == NULL)
goto done;
ch->ccw[12].cmd_code = CCW_CMD_WRITE;
ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[12].count = XID2_LENGTH;
ch->ccw[12].cda = virt_to_phys(ch->xid);
if (ch->xid_id == NULL)
goto done;
ch->ccw[13].cmd_code = CCW_CMD_WRITE;
ch->ccw[13].cda = virt_to_phys(ch->xid_id);
}
ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ch->ccw[13].count = 4;
ch->ccw[14].cmd_code = CCW_CMD_NOOP;
ch->ccw[14].flags = CCW_FLAG_SLI;
ch->ccw[14].count = 0;
ch->ccw[14].cda = 0;
CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
CTCM_D3_DUMP((char *)ch->xid_id, 4);
if (!in_hardirq()) {
/* Such conditional locking is a known problem for
* sparse because its static undeterministic.
* Warnings should be ignored here. */
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
gotlock = 1;
}
fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
if (gotlock) /* see remark above about conditional locking */
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
if (rc != 0) {
ctcm_ccw_check_rc(ch, rc,
(side == XSIDE) ? "x-side XID" : "y-side XID");
}
done:
CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
__func__, ch, ch->id);
return;
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
{
mpc_action_side_xid(fsm, arg, XSIDE);
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
{
mpc_action_side_xid(fsm, arg, YSIDE);
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
{
struct channel *ch = arg;
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
__func__, smp_processor_id(), ch, ch->id);
if (ch->xid == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): ch->xid == NULL",
CTCM_FUNTAIL, dev->name);
return;
}
fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
ch->xid->xid2_option = XID2_0;
switch (fsm_getstate(grp->fsm)) {
case MPCG_STATE_XID2INITW:
case MPCG_STATE_XID2INITX:
ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
break;
case MPCG_STATE_XID0IOWAIT:
case MPCG_STATE_XID0IOWAIX:
ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
break;
}
fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
return;
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
{
struct net_device *dev = arg;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = NULL;
int direction;
int send = 0;
if (priv)
grp = priv->mpcg;
if (grp == NULL)
return;
for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
struct channel *ch = priv->channel[direction];
struct xid2 *thisxid = ch->xid;
ch->xid_skb->data = ch->xid_skb_data;
skb_reset_tail_pointer(ch->xid_skb);
ch->xid_skb->len = 0;
thisxid->xid2_option = XID2_7;
send = 0;
/* xid7 phase 1 */
if (grp->outstanding_xid7_p2 > 0) {
if (grp->roll == YSIDE) {
if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
fsm_newstate(ch->fsm, CH_XID7_PENDING2);
ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
skb_put_data(ch->xid_skb, &thdummy,
TH_HEADER_LENGTH);
send = 1;
}
} else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
fsm_newstate(ch->fsm, CH_XID7_PENDING2);
ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
skb_put_data(ch->xid_skb, &thnorm,
TH_HEADER_LENGTH);
send = 1;
}
} else {
/* xid7 phase 2 */
if (grp->roll == YSIDE) {
if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
fsm_newstate(ch->fsm, CH_XID7_PENDING4);
skb_put_data(ch->xid_skb, &thnorm,
TH_HEADER_LENGTH);
ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
send = 1;
}
} else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
fsm_newstate(ch->fsm, CH_XID7_PENDING4);
ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
skb_put_data(ch->xid_skb, &thdummy,
TH_HEADER_LENGTH);
send = 1;
}
}
if (send)
fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
}
return;
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
{
struct mpcg_info *mpcginfo = arg;
struct channel *ch = mpcginfo->ch;
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
__func__, ch->id, grp->outstanding_xid2,
grp->outstanding_xid7, grp->outstanding_xid7_p2);
if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
fsm_newstate(ch->fsm, CH_XID7_PENDING);
grp->outstanding_xid2--;
grp->outstanding_xid7++;
grp->outstanding_xid7_p2++;
/* must change state before validating xid to */
/* properly handle interim interrupts received*/
switch (fsm_getstate(grp->fsm)) {
case MPCG_STATE_XID2INITW:
fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
mpc_validate_xid(mpcginfo);
break;
case MPCG_STATE_XID0IOWAIT:
fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
mpc_validate_xid(mpcginfo);
break;
case MPCG_STATE_XID2INITX:
if (grp->outstanding_xid2 == 0) {
fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
mpc_validate_xid(mpcginfo);
fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
}
break;
case MPCG_STATE_XID0IOWAIX:
if (grp->outstanding_xid2 == 0) {
fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
mpc_validate_xid(mpcginfo);
fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
}
break;
}
CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
__func__, ch->id, grp->outstanding_xid2,
grp->outstanding_xid7, grp->outstanding_xid7_p2);
CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
__func__, ch->id,
fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
return;
}
/*
* MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
{
struct mpcg_info *mpcginfo = arg;
struct channel *ch = mpcginfo->ch;
struct net_device *dev = ch->netdev;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
__func__, smp_processor_id(), ch, ch->id);
CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
__func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
grp->outstanding_xid7--;
ch->xid_skb->data = ch->xid_skb_data;
skb_reset_tail_pointer(ch->xid_skb);
ch->xid_skb->len = 0;
switch (fsm_getstate(grp->fsm)) {
case MPCG_STATE_XID7INITI:
fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
mpc_validate_xid(mpcginfo);
break;
case MPCG_STATE_XID7INITW:
fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
mpc_validate_xid(mpcginfo);
break;
case MPCG_STATE_XID7INITZ:
case MPCG_STATE_XID7INITX:
if (grp->outstanding_xid7 == 0) {
if (grp->outstanding_xid7_p2 > 0) {
grp->outstanding_xid7 =
grp->outstanding_xid7_p2;
grp->outstanding_xid7_p2 = 0;
} else
fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
mpc_validate_xid(mpcginfo);
fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
break;
}
mpc_validate_xid(mpcginfo);
break;
}
return;
}
/*
* mpc_action helper of an MPC Group Station FSM action
* CTCM_PROTO_MPC only
*/
static int mpc_send_qllc_discontact(struct net_device *dev)
{
struct sk_buff *skb;
struct qllc *qllcptr;
struct ctcm_priv *priv = dev->ml_priv;
struct mpc_group *grp = priv->mpcg;
CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
__func__, mpcg_state_names[grp->saved_state]);
switch (grp->saved_state) {
/*
* establish conn callback function is
* preferred method to report failure
*/
case MPCG_STATE_XID0IOWAIT:
case MPCG_STATE_XID0IOWAIX:
case MPCG_STATE_XID7INITI:
case MPCG_STATE_XID7INITZ:
case MPCG_STATE_XID2INITW:
case MPCG_STATE_XID2INITX:
case MPCG_STATE_XID7INITW:
case MPCG_STATE_XID7INITX:
if (grp->estconnfunc) {
grp->estconnfunc(grp->port_num, -1, 0);
grp->estconnfunc = NULL;
break;
}
fallthrough;
case MPCG_STATE_FLOWC:
case MPCG_STATE_READY:
grp->send_qllc_disc = 2;
skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
if (skb == NULL) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): skb allocation error",
CTCM_FUNTAIL, dev->name);
priv->stats.rx_dropped++;
return -ENOMEM;
}
qllcptr = skb_put(skb, sizeof(struct qllc));
qllcptr->qllc_address = 0xcc;
qllcptr->qllc_commands = 0x03;
if (skb_headroom(skb) < 4) {
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
"%s(%s): skb_headroom error",
CTCM_FUNTAIL, dev->name);
dev_kfree_skb_any(skb);
return -ENOMEM;
}
*((__u32 *)skb_push(skb, 4)) =
priv->channel[CTCM_READ]->pdu_seq;
priv->channel[CTCM_READ]->pdu_seq++;
CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
__func__, priv->channel[CTCM_READ]->pdu_seq);
/* receipt of CC03 resets anticipated sequence number on
receiving side */
priv->channel[CTCM_READ]->pdu_seq = 0x00;
skb_reset_mac_header(skb);
skb->dev = dev;
skb->protocol = htons(ETH_P_SNAP);
skb->ip_summed = CHECKSUM_UNNECESSARY;
CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
netif_rx(skb);
break;
default:
break;
}
return 0;
}
/* --- This is the END my friend --- */