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linux_dsm_epyc7002/drivers/net/fddi/skfp/ess.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
*
* (C)Copyright 1998,1999 SysKonnect,
* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
*
* See the file "skfddi.c" for further information.
*
* 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");
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");
return fs;
}
DB_ESSN(2, "fc %x ft %x", sm->smt_class, sm->smt_type);
DB_ESSN(2, "ver %x tran %x", sm->smt_version, sm->smt_tid);
DB_ESSN(2, "stn_id %s", addr_to_string(&sm->smt_source));
DB_ESSN(2, "infolen %x res %lx", sm->smt_len, msg_res_type);
DB_ESSN(2, "sbacmd %x", cmd->sba_cmd);
/*
* 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 %x", sm->smt_tid);
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");
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");
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",
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");
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");
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");
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",
addr_to_string(&sm->smt_source));
DB_ESSN(2, "payload= %lx overhead= %lx",
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");
return fs;
}
DB_ESSN(2, "ESS: Report Request from %s",
addr_to_string(&sm->smt_source));
/*
* verify that the resource type is sync bw only
*/
if (msg_res_type != SYNC_BW) {
DB_ESS("ESS: ignoring RAF with para problem");
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");
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");
return FALSE;
}
if (smt_set_obj(smc,SMT_P3210,overhead,S_SET)) {
DB_ESS("ESS: SMT does not accept the overhead value");
return FALSE;
} */
/* premliminary */
if (payload > MAX_PAYLOAD || overhead > 5000) {
DB_ESS("ESS: payload / overhead not accepted");
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");
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");
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", smc->ess.sync_bw);
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");
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");
if (!smc->ess.sba_reply_pend)
smc->ess.sba_reply_pend = mb ;
else {
DB_ESS("Frame is lost - another frame was pending");
smt_free_mbuf(smc,mb) ;
}
}
else {
/*
* Send the SBA RAF Change Reply to the network
*/
DB_ESS("ESS:Send to the network");
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 */
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