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linux_dsm_epyc7002/drivers/net/skfp/ess.c
Eric Dumazet 807540baae drivers/net: return operator cleanup 
Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-26 18:34:29 -07:00

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/******************************************************************************
*
* (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 Responce 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 discribed 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 responce 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 responce 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 */
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