Orange Pi5 kernel

// 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>
 
#include <linux/io.h>		/* instead of <asm/io.h> ok ? */
#include <asm/ccwdev.h>
#include <asm/ccwgroup.h>
#include <linux/bitops.h>	/* instead of <asm/bitops.h> ok ? */
#include <linux/uaccess.h>	/* instead of <asm/uaccess.h> ok ? */
#include <linux/wait.h>
#include <linux/moduleparam.h>
#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) {
<------><------><------>sprintf(addr, "%16.16llx", (__u64)rptr);
 
<------><------><------>sprintf(boff, "%4.4X", (__u32)ct);
<------><------><------>bhex[0] = '\0';
<------><------><------>basc[0] = '\0';
<------><------>}
<------><------>if ((sw == 4) || (sw == 12))
<------><------><------>strcat(bhex, " ");
<------><------>if (sw == 8)
<------><------><------>strcat(bhex, "	");
 
<------><------>sprintf(tbuf, "%2.2llX", (__u64)*ptr);
 
<------><------>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) {
<------><------><------><------>sprintf(tdup,
<------><------><------><------><------>"Duplicate as above to %s", addr);
<------><------><------><------>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) {
<------><------><------>sprintf(tdup, "Duplicate as above to %s", addr);
<------><------><------>ctcm_pr_debug("		       --- %s ---\n", tdup);
<------><------>}
<------><------>ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
<------><------><------><------><------>addr, boff, bhex, basc);
<------>} else {
<------><------>if (dup >= 1) {
<------><------><------>sprintf(tdup, "Duplicate as above to %s", addr);
<------><------><------>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;
 
<------>sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
 
<------>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);
<------>}
 
<------>kfree(mpcginfo);
 
<------>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 = kmalloc(sizeof(struct th_sweep), gfp_type());
 
<------>if (!header) {
<------><------>dev_kfree_skb_any(sweep_skb);
<------><------>goto done;
<------>}
 
<------>header->th.th_seg	= 0x00 ;
<------>header->th.th_ch_flag	= TH_SWEEP_RESP;
<------>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;
 
<------>skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
 
<------>kfree(header);
 
<------>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_type());
<------><------>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 */
<------><------><------>kfree(mpcginfo);
<------><------><------>if (do_debug_data)
<------><------><------><------>ctcmpc_dump_skb(pskb, -8);
<------><------>}
<------>}
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_irq()) {
<------><------><------> /* 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;
<------>}
<------>kfree(mpcginfo);
 
<------>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;
<------>}
<------>kfree(mpcginfo);
<------>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)
{
<------>__u32	new_len	= 0;
<------>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;
<------><------>new_len = sizeof(struct qllc);
<------><------>qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
<------><------>if (qllcptr == NULL) {
<------><------><------>CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
<------><------><------><------>"%s(%s): qllcptr allocation error",
<------><------><------><------><------><------>CTCM_FUNTAIL, dev->name);
<------><------><------>return -ENOMEM;
<------><------>}
 
<------><------>qllcptr->qllc_address = 0xcc;
<------><------>qllcptr->qllc_commands = 0x03;
 
<------><------>skb = __dev_alloc_skb(new_len, 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++;
<------><------><------>kfree(qllcptr);
<------><------><------>return -ENOMEM;
<------><------>}
 
<------><------>skb_put_data(skb, qllcptr, new_len);
<------><------>kfree(qllcptr);
 
<------><------>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 --- */