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path: root/drivers/s390/net/ctcm_mpc.c
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Diffstat (limited to 'drivers/s390/net/ctcm_mpc.c')
-rw-r--r--drivers/s390/net/ctcm_mpc.c2179
1 files changed, 2179 insertions, 0 deletions
diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c
new file mode 100644
index 00000000000..da4c747335e
--- /dev/null
+++ b/drivers/s390/net/ctcm_mpc.c
@@ -0,0 +1,2179 @@
+/*
+ * drivers/s390/net/ctcm_mpc.c
+ *
+ * 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_mpc.h"
+#include "ctcm_main.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];
+ #if (UTS_MACHINE == s390x)
+ char addr[22];
+ #else
+ char addr[12];
+ #endif
+ 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) {
+ #if (UTS_MACHINE == s390x)
+ sprintf(addr, "%16.16lx", (__u64)rptr);
+ #else
+ sprintf(addr, "%8.8X", (__u32)rptr);
+ #endif
+
+ sprintf(boff, "%4.4X", (__u32)ct);
+ bhex[0] = '\0';
+ basc[0] = '\0';
+ }
+ if ((sw == 4) || (sw == 12))
+ strcat(bhex, " ");
+ if (sw == 8)
+ strcat(bhex, " ");
+
+ #if (UTS_MACHINE == s390x)
+ sprintf(tbuf, "%2.2lX", (__u64)*ptr);
+ #else
+ sprintf(tbuf, "%2.2X", (__u32)*ptr);
+ #endif
+
+ 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;
+ 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;
+
+ memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
+
+ kfree(header);
+
+ dev->trans_start = jiffies;
+ skb_queue_tail(&ch->sweep_queue, sweep_skb);
+
+ fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
+
+ return;
+
+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;
+
+ memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
+ 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;
+ }
+ memcpy(skb_put(skb, new_len), 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;
+ memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
+ &thnorm, TH_HEADER_LENGTH);
+
+ grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
+ memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &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);
+ memcpy(skb_put(grp->xid_skb, 4), "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;
+ memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
+ &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;
+
+ BUG_ON(dev == NULL);
+ 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;
+ memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &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;
+
+ BUG_ON(dev == NULL);
+
+ 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;
+ 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],
+ (unsigned long)ch, 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);
+
+ memcpy(skb_put(grp->rcvd_xid_skb,
+ XID2_LENGTH), 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],
+ (unsigned long)ch, 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;
+ memcpy(skb_put(ch->xid_skb,
+ TH_HEADER_LENGTH),
+ &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;
+ memcpy(skb_put(ch->xid_skb,
+ TH_HEADER_LENGTH),
+ &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);
+ memcpy(skb_put(ch->xid_skb,
+ TH_HEADER_LENGTH),
+ &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;
+ memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
+ &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;
+ }
+ 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;
+ }
+
+ memcpy(skb_put(skb, new_len), 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 --- */
+