diff options
Diffstat (limited to 'drivers/net/fddi/skfp/ess.c')
| -rw-r--r-- | drivers/net/fddi/skfp/ess.c | 720 |
1 files changed, 720 insertions, 0 deletions
diff --git a/drivers/net/fddi/skfp/ess.c b/drivers/net/fddi/skfp/ess.c new file mode 100644 index 000000000000..2fc5987b41dc --- /dev/null +++ b/drivers/net/fddi/skfp/ess.c @@ -0,0 +1,720 @@ +/****************************************************************************** + * + * (C)Copyright 1998,1999 SysKonnect, + * a business unit of Schneider & Koch & Co. Datensysteme GmbH. + * + * See the file "skfddi.c" for further information. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * The information in this file is provided "AS IS" without warranty. + * + ******************************************************************************/ + +/* + * ******************************************************************* + * This SBA code implements the Synchronous Bandwidth Allocation + * functions described in the "FDDI Synchronous Forum Implementer's + * Agreement" dated December 1th, 1993. + * ******************************************************************* + * + * PURPOSE: The purpose of this function is to control + * synchronous allocations on a single FDDI segment. + * Allocations are limited to the primary FDDI ring. + * The SBM provides recovery mechanisms to recover + * unused bandwidth also resolves T_Neg and + * reconfiguration changes. Many of the SBM state + * machine inputs are sourced by the underlying + * FDDI sub-system supporting the SBA application. + * + * ******************************************************************* + */ + +#include "h/types.h" +#include "h/fddi.h" +#include "h/smc.h" +#include "h/smt_p.h" + + +#ifndef SLIM_SMT + +#ifdef ESS + +#ifndef lint +static const char ID_sccs[] = "@(#)ess.c 1.10 96/02/23 (C) SK" ; +#define LINT_USE(x) +#else +#define LINT_USE(x) (x)=(x) +#endif +#define MS2BCLK(x) ((x)*12500L) + +/* + ------------------------------------------------------------- + LOCAL VARIABLES: + ------------------------------------------------------------- +*/ + +static const u_short plist_raf_alc_res[] = { SMT_P0012, SMT_P320B, SMT_P320F, + SMT_P3210, SMT_P0019, SMT_P001A, + SMT_P001D, 0 } ; + +static const u_short plist_raf_chg_req[] = { SMT_P320B, SMT_P320F, SMT_P3210, + SMT_P001A, 0 } ; + +static const struct fddi_addr smt_sba_da = {{0x80,0x01,0x43,0x00,0x80,0x0C}} ; +static const struct fddi_addr null_addr = {{0,0,0,0,0,0}} ; + +/* + ------------------------------------------------------------- + GLOBAL VARIABLES: + ------------------------------------------------------------- +*/ + + +/* + ------------------------------------------------------------- + LOCAL FUNCTIONS: + ------------------------------------------------------------- +*/ + +static void ess_send_response(struct s_smc *smc, struct smt_header *sm, + int sba_cmd); +static void ess_config_fifo(struct s_smc *smc); +static void ess_send_alc_req(struct s_smc *smc); +static void ess_send_frame(struct s_smc *smc, SMbuf *mb); + +/* + ------------------------------------------------------------- + EXTERNAL FUNCTIONS: + ------------------------------------------------------------- +*/ + +/* + ------------------------------------------------------------- + PUBLIC FUNCTIONS: + ------------------------------------------------------------- +*/ + +void ess_timer_poll(struct s_smc *smc); +void ess_para_change(struct s_smc *smc); +int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm, + int fs); +static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead); + + +/* + * -------------------------------------------------------------------------- + * End Station Support (ESS) + * -------------------------------------------------------------------------- + */ + +/* + * evaluate the RAF frame + */ +int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm, + int fs) +{ + void *p ; /* universal pointer */ + struct smt_p_0016 *cmd ; /* para: command for the ESS */ + SMbuf *db ; + u_long msg_res_type ; /* recource type */ + u_long payload, overhead ; + int local ; + int i ; + + /* + * Message Processing Code + */ + local = ((fs & L_INDICATOR) != 0) ; + + /* + * get the resource type + */ + if (!(p = (void *) sm_to_para(smc,sm,SMT_P0015))) { + DB_ESS("ESS: RAF frame error, parameter type not found\n",0,0) ; + return fs; + } + msg_res_type = ((struct smt_p_0015 *)p)->res_type ; + + /* + * get the pointer to the ESS command + */ + if (!(cmd = (struct smt_p_0016 *) sm_to_para(smc,sm,SMT_P0016))) { + /* + * error in frame: para ESS command was not found + */ + DB_ESS("ESS: RAF frame error, parameter command not found\n",0,0); + return fs; + } + + DB_ESSN(2,"fc %x ft %x\n",sm->smt_class,sm->smt_type) ; + DB_ESSN(2,"ver %x tran %lx\n",sm->smt_version,sm->smt_tid) ; + DB_ESSN(2,"stn_id %s\n",addr_to_string(&sm->smt_source),0) ; + + DB_ESSN(2,"infolen %x res %x\n",sm->smt_len, msg_res_type) ; + DB_ESSN(2,"sbacmd %x\n",cmd->sba_cmd,0) ; + + /* + * evaluate the ESS command + */ + switch (cmd->sba_cmd) { + + /* + * Process an ESS Allocation Request + */ + case REQUEST_ALLOCATION : + /* + * check for an RAF Request (Allocation Request) + */ + if (sm->smt_type == SMT_REQUEST) { + /* + * process the Allocation request only if the frame is + * local and no static allocation is used + */ + if (!local || smc->mib.fddiESSPayload) + return fs; + + p = (void *) sm_to_para(smc,sm,SMT_P0019) ; + for (i = 0; i < 5; i++) { + if (((struct smt_p_0019 *)p)->alloc_addr.a[i]) { + return fs; + } + } + + /* + * Note: The Application should send a LAN_LOC_FRAME. + * The ESS do not send the Frame to the network! + */ + smc->ess.alloc_trans_id = sm->smt_tid ; + DB_ESS("ESS: save Alloc Req Trans ID %lx\n",sm->smt_tid,0); + p = (void *) sm_to_para(smc,sm,SMT_P320F) ; + ((struct smt_p_320f *)p)->mib_payload = + smc->mib.a[PATH0].fddiPATHSbaPayload ; + p = (void *) sm_to_para(smc,sm,SMT_P3210) ; + ((struct smt_p_3210 *)p)->mib_overhead = + smc->mib.a[PATH0].fddiPATHSbaOverhead ; + sm->smt_dest = smt_sba_da ; + + if (smc->ess.local_sba_active) + return fs | I_INDICATOR; + + if (!(db = smt_get_mbuf(smc))) + return fs; + + db->sm_len = mb->sm_len ; + db->sm_off = mb->sm_off ; + memcpy(((char *)(db->sm_data+db->sm_off)),(char *)sm, + (int)db->sm_len) ; + dump_smt(smc, + (struct smt_header *)(db->sm_data+db->sm_off), + "RAF") ; + smt_send_frame(smc,db,FC_SMT_INFO,0) ; + return fs; + } + + /* + * The RAF frame is an Allocation Response ! + * check the parameters + */ + if (smt_check_para(smc,sm,plist_raf_alc_res)) { + DB_ESS("ESS: RAF with para problem, ignoring\n",0,0) ; + return fs; + } + + /* + * VERIFY THE FRAME IS WELL BUILT: + * + * 1. path index = primary ring only + * 2. resource type = sync bw only + * 3. trans action id = alloc_trans_id + * 4. reason code = success + * + * If any are violated, discard the RAF frame + */ + if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index + != PRIMARY_RING) || + (msg_res_type != SYNC_BW) || + (((struct smt_p_reason *)sm_to_para(smc,sm,SMT_P0012))->rdf_reason + != SMT_RDF_SUCCESS) || + (sm->smt_tid != smc->ess.alloc_trans_id)) { + + DB_ESS("ESS: Allocation Response not accepted\n",0,0) ; + return fs; + } + + /* + * Extract message parameters + */ + p = (void *) sm_to_para(smc,sm,SMT_P320F) ; + if (!p) { + printk(KERN_ERR "ESS: sm_to_para failed"); + return fs; + } + payload = ((struct smt_p_320f *)p)->mib_payload ; + p = (void *) sm_to_para(smc,sm,SMT_P3210) ; + if (!p) { + printk(KERN_ERR "ESS: sm_to_para failed"); + return fs; + } + overhead = ((struct smt_p_3210 *)p)->mib_overhead ; + + DB_ESSN(2,"payload= %lx overhead= %lx\n",payload,overhead) ; + + /* + * process the bandwidth allocation + */ + (void)process_bw_alloc(smc,(long)payload,(long)overhead) ; + + return fs; + /* end of Process Allocation Request */ + + /* + * Process an ESS Change Request + */ + case CHANGE_ALLOCATION : + /* + * except only replies + */ + if (sm->smt_type != SMT_REQUEST) { + DB_ESS("ESS: Do not process Change Responses\n",0,0) ; + return fs; + } + + /* + * check the para for the Change Request + */ + if (smt_check_para(smc,sm,plist_raf_chg_req)) { + DB_ESS("ESS: RAF with para problem, ignoring\n",0,0) ; + return fs; + } + + /* + * Verify the path index and resource + * type are correct. If any of + * these are false, don't process this + * change request frame. + */ + if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index + != PRIMARY_RING) || (msg_res_type != SYNC_BW)) { + DB_ESS("ESS: RAF frame with para problem, ignoring\n",0,0) ; + return fs; + } + + /* + * Extract message queue parameters + */ + p = (void *) sm_to_para(smc,sm,SMT_P320F) ; + payload = ((struct smt_p_320f *)p)->mib_payload ; + p = (void *) sm_to_para(smc,sm,SMT_P3210) ; + overhead = ((struct smt_p_3210 *)p)->mib_overhead ; + + DB_ESSN(2,"ESS: Change Request from %s\n", + addr_to_string(&sm->smt_source),0) ; + DB_ESSN(2,"payload= %lx overhead= %lx\n",payload,overhead) ; + + /* + * process the bandwidth allocation + */ + if(!process_bw_alloc(smc,(long)payload,(long)overhead)) + return fs; + + /* + * send an RAF Change Reply + */ + ess_send_response(smc,sm,CHANGE_ALLOCATION) ; + + return fs; + /* end of Process Change Request */ + + /* + * Process Report Response + */ + case REPORT_ALLOCATION : + /* + * except only requests + */ + if (sm->smt_type != SMT_REQUEST) { + DB_ESS("ESS: Do not process a Report Reply\n",0,0) ; + return fs; + } + + DB_ESSN(2,"ESS: Report Request from %s\n", + addr_to_string(&(sm->smt_source)),0) ; + + /* + * verify that the resource type is sync bw only + */ + if (msg_res_type != SYNC_BW) { + DB_ESS("ESS: ignoring RAF with para problem\n",0,0) ; + return fs; + } + + /* + * send an RAF Change Reply + */ + ess_send_response(smc,sm,REPORT_ALLOCATION) ; + + return fs; + /* end of Process Report Request */ + + default: + /* + * error in frame + */ + DB_ESS("ESS: ignoring RAF with bad sba_cmd\n",0,0) ; + break ; + } + + return fs; +} + +/* + * determines the synchronous bandwidth, set the TSYNC register and the + * mib variables SBAPayload, SBAOverhead and fddiMACT-NEG. + */ +static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead) +{ + /* + * determine the synchronous bandwidth (sync_bw) in bytes per T-NEG, + * if the payload is greater than zero. + * For the SBAPayload and the SBAOverhead we have the following + * unite quations + * _ _ + * | bytes | + * SBAPayload = | 8000 ------ | + * | s | + * - - + * _ _ + * | bytes | + * SBAOverhead = | ------ | + * | T-NEG | + * - - + * + * T-NEG is described by the equation: + * + * (-) fddiMACT-NEG + * T-NEG = ------------------- + * 12500000 1/s + * + * The number of bytes we are able to send is the payload + * plus the overhead. + * + * bytes T-NEG SBAPayload 8000 bytes/s + * sync_bw = SBAOverhead ------ + ----------------------------- + * T-NEG T-NEG + * + * + * 1 + * sync_bw = SBAOverhead + ---- (-)fddiMACT-NEG * SBAPayload + * 1562 + * + */ + + /* + * set the mib attributes fddiPATHSbaOverhead, fddiPATHSbaPayload + */ +/* if (smt_set_obj(smc,SMT_P320F,payload,S_SET)) { + DB_ESS("ESS: SMT does not accept the payload value\n",0,0) ; + return FALSE; + } + if (smt_set_obj(smc,SMT_P3210,overhead,S_SET)) { + DB_ESS("ESS: SMT does not accept the overhead value\n",0,0) ; + return FALSE; + } */ + + /* premliminary */ + if (payload > MAX_PAYLOAD || overhead > 5000) { + DB_ESS("ESS: payload / overhead not accepted\n",0,0) ; + return FALSE; + } + + /* + * start the iterative allocation process if the payload or the overhead + * are smaller than the parsed values + */ + if (smc->mib.fddiESSPayload && + ((u_long)payload != smc->mib.fddiESSPayload || + (u_long)overhead != smc->mib.fddiESSOverhead)) { + smc->ess.raf_act_timer_poll = TRUE ; + smc->ess.timer_count = 0 ; + } + + /* + * evulate the Payload + */ + if (payload) { + DB_ESSN(2,"ESS: turn SMT_ST_SYNC_SERVICE bit on\n",0,0) ; + smc->ess.sync_bw_available = TRUE ; + + smc->ess.sync_bw = overhead - + (long)smc->mib.m[MAC0].fddiMACT_Neg * + payload / 1562 ; + } + else { + DB_ESSN(2,"ESS: turn SMT_ST_SYNC_SERVICE bit off\n",0,0) ; + smc->ess.sync_bw_available = FALSE ; + smc->ess.sync_bw = 0 ; + overhead = 0 ; + } + + smc->mib.a[PATH0].fddiPATHSbaPayload = payload ; + smc->mib.a[PATH0].fddiPATHSbaOverhead = overhead ; + + + DB_ESSN(2,"tsync = %lx\n",smc->ess.sync_bw,0) ; + + ess_config_fifo(smc) ; + set_formac_tsync(smc,smc->ess.sync_bw) ; + return TRUE; +} + +static void ess_send_response(struct s_smc *smc, struct smt_header *sm, + int sba_cmd) +{ + struct smt_sba_chg *chg ; + SMbuf *mb ; + void *p ; + + /* + * get and initialize the response frame + */ + if (sba_cmd == CHANGE_ALLOCATION) { + if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY, + sizeof(struct smt_sba_chg)))) + return ; + } + else { + if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY, + sizeof(struct smt_sba_rep_res)))) + return ; + } + + chg = smtod(mb,struct smt_sba_chg *) ; + chg->smt.smt_tid = sm->smt_tid ; + chg->smt.smt_dest = sm->smt_source ; + + /* set P15 */ + chg->s_type.para.p_type = SMT_P0015 ; + chg->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ; + chg->s_type.res_type = SYNC_BW ; + + /* set P16 */ + chg->cmd.para.p_type = SMT_P0016 ; + chg->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ; + chg->cmd.sba_cmd = sba_cmd ; + + /* set P320B */ + chg->path.para.p_type = SMT_P320B ; + chg->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ; + chg->path.mib_index = SBAPATHINDEX ; + chg->path.path_pad = 0; + chg->path.path_index = PRIMARY_RING ; + + /* set P320F */ + chg->payload.para.p_type = SMT_P320F ; + chg->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ; + chg->payload.mib_index = SBAPATHINDEX ; + chg->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ; + + /* set P3210 */ + chg->overhead.para.p_type = SMT_P3210 ; + chg->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ; + chg->overhead.mib_index = SBAPATHINDEX ; + chg->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ; + + if (sba_cmd == CHANGE_ALLOCATION) { + /* set P1A */ + chg->cat.para.p_type = SMT_P001A ; + chg->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ; + p = (void *) sm_to_para(smc,sm,SMT_P001A) ; + chg->cat.category = ((struct smt_p_001a *)p)->category ; + } + dump_smt(smc,(struct smt_header *)chg,"RAF") ; + ess_send_frame(smc,mb) ; +} + +void ess_timer_poll(struct s_smc *smc) +{ + if (!smc->ess.raf_act_timer_poll) + return ; + + DB_ESSN(2,"ESS: timer_poll\n",0,0) ; + + smc->ess.timer_count++ ; + if (smc->ess.timer_count == 10) { + smc->ess.timer_count = 0 ; + ess_send_alc_req(smc) ; + } +} + +static void ess_send_alc_req(struct s_smc *smc) +{ + struct smt_sba_alc_req *req ; + SMbuf *mb ; + + /* + * send never allocation request where the requested payload and + * overhead is zero or deallocate bandwidth when no bandwidth is + * parsed + */ + if (!smc->mib.fddiESSPayload) { + smc->mib.fddiESSOverhead = 0 ; + } + else { + if (!smc->mib.fddiESSOverhead) + smc->mib.fddiESSOverhead = DEFAULT_OV ; + } + + if (smc->mib.fddiESSOverhead == + smc->mib.a[PATH0].fddiPATHSbaOverhead && + smc->mib.fddiESSPayload == + smc->mib.a[PATH0].fddiPATHSbaPayload){ + smc->ess.raf_act_timer_poll = FALSE ; + smc->ess.timer_count = 7 ; /* next RAF alc req after 3 s */ + return ; + } + + /* + * get and initialize the response frame + */ + if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REQUEST, + sizeof(struct smt_sba_alc_req)))) + return ; + req = smtod(mb,struct smt_sba_alc_req *) ; + req->smt.smt_tid = smc->ess.alloc_trans_id = smt_get_tid(smc) ; + req->smt.smt_dest = smt_sba_da ; + + /* set P15 */ + req->s_type.para.p_type = SMT_P0015 ; + req->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ; + req->s_type.res_type = SYNC_BW ; + + /* set P16 */ + req->cmd.para.p_type = SMT_P0016 ; + req->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ; + req->cmd.sba_cmd = REQUEST_ALLOCATION ; + + /* + * set the parameter type and parameter length of all used + * parameters + */ + + /* set P320B */ + req->path.para.p_type = SMT_P320B ; + req->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ; + req->path.mib_index = SBAPATHINDEX ; + req->path.path_pad = 0; + req->path.path_index = PRIMARY_RING ; + + /* set P0017 */ + req->pl_req.para.p_type = SMT_P0017 ; + req->pl_req.para.p_len = sizeof(struct smt_p_0017) - PARA_LEN ; + req->pl_req.sba_pl_req = smc->mib.fddiESSPayload - + smc->mib.a[PATH0].fddiPATHSbaPayload ; + + /* set P0018 */ + req->ov_req.para.p_type = SMT_P0018 ; + req->ov_req.para.p_len = sizeof(struct smt_p_0018) - PARA_LEN ; + req->ov_req.sba_ov_req = smc->mib.fddiESSOverhead - + smc->mib.a[PATH0].fddiPATHSbaOverhead ; + + /* set P320F */ + req->payload.para.p_type = SMT_P320F ; + req->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ; + req->payload.mib_index = SBAPATHINDEX ; + req->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ; + + /* set P3210 */ + req->overhead.para.p_type = SMT_P3210 ; + req->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ; + req->overhead.mib_index = SBAPATHINDEX ; + req->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ; + + /* set P19 */ + req->a_addr.para.p_type = SMT_P0019 ; + req->a_addr.para.p_len = sizeof(struct smt_p_0019) - PARA_LEN ; + req->a_addr.sba_pad = 0; + req->a_addr.alloc_addr = null_addr ; + + /* set P1A */ + req->cat.para.p_type = SMT_P001A ; + req->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ; + req->cat.category = smc->mib.fddiESSCategory ; + + /* set P1B */ + req->tneg.para.p_type = SMT_P001B ; + req->tneg.para.p_len = sizeof(struct smt_p_001b) - PARA_LEN ; + req->tneg.max_t_neg = smc->mib.fddiESSMaxTNeg ; + + /* set P1C */ + req->segm.para.p_type = SMT_P001C ; + req->segm.para.p_len = sizeof(struct smt_p_001c) - PARA_LEN ; + req->segm.min_seg_siz = smc->mib.fddiESSMinSegmentSize ; + + dump_smt(smc,(struct smt_header *)req,"RAF") ; + ess_send_frame(smc,mb) ; +} + +static void ess_send_frame(struct s_smc *smc, SMbuf *mb) +{ + /* + * check if the frame must be send to the own ESS + */ + if (smc->ess.local_sba_active) { + /* + * Send the Change Reply to the local SBA + */ + DB_ESS("ESS:Send to the local SBA\n",0,0) ; + if (!smc->ess.sba_reply_pend) + smc->ess.sba_reply_pend = mb ; + else { + DB_ESS("Frame is lost - another frame was pending\n",0,0); + smt_free_mbuf(smc,mb) ; + } + } + else { + /* + * Send the SBA RAF Change Reply to the network + */ + DB_ESS("ESS:Send to the network\n",0,0) ; + smt_send_frame(smc,mb,FC_SMT_INFO,0) ; + } +} + +void ess_para_change(struct s_smc *smc) +{ + (void)process_bw_alloc(smc,(long)smc->mib.a[PATH0].fddiPATHSbaPayload, + (long)smc->mib.a[PATH0].fddiPATHSbaOverhead) ; +} + +static void ess_config_fifo(struct s_smc *smc) +{ + /* + * if nothing to do exit + */ + if (smc->mib.a[PATH0].fddiPATHSbaPayload) { + if (smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON && + (smc->hw.fp.fifo.fifo_config_mode&SEND_ASYNC_AS_SYNC) == + smc->mib.fddiESSSynchTxMode) { + return ; + } + } + else { + if (!(smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON)) { + return ; + } + } + + /* + * split up the FIFO and reinitialize the queues + */ + formac_reinit_tx(smc) ; +} + +#endif /* ESS */ + +#endif /* no SLIM_SMT */ + |