feat(ttl): Drive traffic and port wait from SWB_UNIT0/SWB_UNIT1

The bench is not always fully populated. config.ttl now declares which
switch units exist:

    SWB_UNIT0 = 1   ; this DUT has switch unit 0
    SWB_UNIT1 = 1   ; this DUT has switch unit 1

Two values are derived there rather than repeating the same test in
three scripts: swb_any (0 = no unit at all) and swb_opt, the suffix
appended to each blanton_traffic_linespeed call -- "" for both units so
the tool's own TL_UNITS="0 1" applies, " -u 0" or " -u 1" for a single
one.

Script A, B and C build their traffic commands with sprintf2 and the
suffix, wrapped in `if swb_any = 1`. A half-populated DUT no longer
issues bcmcmd against an absent unit, and a DUT with no switch board
skips the traffic stage outright instead of filling the log with
failures.

wait_init.ttl reads the same two flags instead of its own copies, so the
wait and the traffic blocks cannot disagree about what is installed.

Script A -> V1.0.5.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RetWKFZFG1ZHcitQAyhwM

src/Script_ABC_Blanton/1_Blanton_Script_A.ttl

@@ -1,6 +1,6 @@
 ; =============================================================================
 ; Script A for Blanton
-; Version : V1.0.4
+; Version : V1.0.5
 ; Date    : 2026-08-21
 ; Author  : ETWen
 ; =============================================================================
@@ -22,6 +22,9 @@
 ;                       ScriptA                                         Remove empty Check History block
 ;                       ScriptA/B                                       Disable lldp + config save before traffic (silent MAC)
 ;                       ScriptB                                         Add sfputil lpmode off Ethernet513/514
+;   V1.0.5  2026-08-21  config.ttl                                      Add SWB_UNIT0/SWB_UNIT1 (+derived swb_any/swb_opt)
+;                       utils/wait_init.ttl                             Follow config.ttl SWB_UNIT0/SWB_UNIT1
+;                       ScriptA/B/C                                     Traffic follows SWB_UNIT: -u 0 / -u 1 / skip
 ; =============================================================================
 include "config.ttl"
 
@@ -124,22 +127,33 @@ sendln "config feature state lldp disabled"
 wait prompt_sonic_root
 sendln "config save -y"
 
+; swb_any / swb_opt come from config.ttl: "" both units, " -u 0" or " -u 1"
+; when only one is populated, and the whole block is skipped when neither is.
+if swb_any = 1 then
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed ps"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed ps%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed init"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed init%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed clear"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed clear%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
     pause 15
-sendln "blanton_traffic_linespeed show"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed show%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed start"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed start%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
     pause 15
-sendln "blanton_traffic_linespeed stop"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed stop%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed report"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed report%s' swb_opt
+    sendln tl_cmd
+endif
 
 ; ========== Show Power on uptime ==========
 wait prompt_sonic_root

src/Script_ABC_Blanton/2_Blanton_Script_B.ttl

@@ -70,17 +70,25 @@ sendln "config feature state lldp disabled"
 wait prompt_sonic_root
 sendln "config save -y"
 
+; swb_any / swb_opt come from config.ttl
+if swb_any = 1 then
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed ps"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed ps%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed init"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed init%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed clear"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed clear%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
     pause 15
-sendln "blanton_traffic_linespeed show"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed show%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed start"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed start%s' swb_opt
+    sendln tl_cmd
+endif
 
 
 

src/Script_ABC_Blanton/3_Blanton_Script_C.ttl

@@ -43,10 +43,15 @@ wait prompt_sonic_root
 sendln "cat ~/hammer/tools/log.stress_ssd"
 
 ; ========== CHECK Traffic counters ==========
+; swb_any / swb_opt come from config.ttl
+if swb_any = 1 then
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed stop"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed stop%s' swb_opt
+    sendln tl_cmd
     wait prompt_sonic_root
-sendln "blanton_traffic_linespeed report"
+    sprintf2 tl_cmd 'blanton_traffic_linespeed report%s' swb_opt
+    sendln tl_cmd
+endif
 
 wait prompt_sonic_root
 sendln "show reboot-cause"

src/Script_ABC_Blanton/config.ttl

@@ -7,6 +7,37 @@ strTestcase="ENV"      ;ENV,EMC,Margin...etc
 EN_Margin         = 0  ; 1: Enable Margin Test, 0: Disable Margin Test
 
 EN_log            = 1  ; 1: Enable log, 0: Disable log
+
+;================================================================
+; Switch Unit Population
+;================================================================
+SWB_UNIT0         = 1   ; 1 = this DUT has switch unit 0, wait for it ; 0 = skip
+SWB_UNIT1         = 1   ; 1 = this DUT has switch unit 1, wait for it ; 0 = skip
+
+; --- derived from the two flags above; do not edit --------------
+; swb_any : 0 = no switch unit at all -> skip every traffic block
+; swb_opt : suffix appended to each blanton_traffic_linespeed call
+;           ""       both units -> tool default TL_UNITS="0 1"
+;           " -u 0"  unit 0 only
+;           " -u 1"  unit 1 only
+swb_any = 0
+swb_opt = ""
+if SWB_UNIT0 = 1 then
+    swb_any = 1
+endif
+if SWB_UNIT1 = 1 then
+    swb_any = 1
+endif
+if SWB_UNIT0 = 1 then
+    if SWB_UNIT1 = 0 then
+        swb_opt = " -u 0"
+    endif
+endif
+if SWB_UNIT0 = 0 then
+    if SWB_UNIT1 = 1 then
+        swb_opt = " -u 1"
+    endif
+endif
 ;================================================================
 ; Prompt Definitions
 ;================================================================

src/Script_ABC_Blanton/utils/wait_init.ttl

@@ -7,11 +7,12 @@
 ; Wait until every switch unit ENABLED below reports more than WT_MIN ports up:
 ;     bcmcmd -n <u> -c ps | grep -w up | wc -l
 ;
-; The DUT is not always fully populated, so declare what this bench has:
+; The DUT is not always fully populated. Which units exist is declared ONCE in
-;     both units  -> WT_UNIT0 = 1 , WT_UNIT1 = 1
+; config.ttl, so the traffic blocks in Script A/B/C and this wait agree:
-;     unit 0 only -> WT_UNIT0 = 1 , WT_UNIT1 = 0
+;     both units  -> SWB_UNIT0 = 1 , SWB_UNIT1 = 1
-;     unit 1 only -> WT_UNIT0 = 0 , WT_UNIT1 = 1
+;     unit 0 only -> SWB_UNIT0 = 1 , SWB_UNIT1 = 0
-;     no unit     -> WT_UNIT0 = 0 , WT_UNIT1 = 0   (bypass, returns immediately)
+;     unit 1 only -> SWB_UNIT0 = 0 , SWB_UNIT1 = 1
+;     no unit     -> SWB_UNIT0 = 0 , SWB_UNIT1 = 0   (bypass, returns immediately)
 ;
 ; Enter : prompt of the previous command is NOT consumed.
 ; Exit  : a command has been sent, prompt NOT consumed (caller does the wait).
@@ -30,10 +31,11 @@
 ;   V3.0.0  2026-08-21  Add WT_UNIT0 / WT_UNIT1 so a partly populated DUT can
 ;                       be declared: wait on the enabled units only, and bypass
 ;                       entirely when neither is set.
+;   V3.1.0  2026-08-21  Take the population from SWB_UNIT0 / SWB_UNIT1 in
+;                       config.ttl instead of local copies, so this wait and the
+;                       traffic blocks cannot drift apart.
 ; =============================================================================
-; ---- edit these for the bench ----------------------------------------------
+; ---- which units to wait for: SWB_UNIT0 / SWB_UNIT1, set in config.ttl ------
-WT_UNIT0    = 1       ; 1 = this DUT has switch unit 0, wait for it ; 0 = skip
-WT_UNIT1    = 1       ; 1 = this DUT has switch unit 1, wait for it ; 0 = skip
 WT_MIN      = 216     ; an enabled unit must report MORE than this many ports up
 WT_INTERVAL = 10      ; seconds between polls
 ; -----------------------------------------------------------------------------
@@ -42,8 +44,8 @@ timeout = 60          ; per-wait cap; bcmcmd ps is not instant
 wait prompt_sonic_root
 
 ; nothing declared -> bypass
-if WT_UNIT0 = 0 then
+if SWB_UNIT0 = 0 then
-    if WT_UNIT1 = 0 then
+    if SWB_UNIT1 = 0 then
         goto NO_UNITS
     endif
 endif
@@ -51,7 +53,7 @@ endif
 :WAIT_PORTS
 wt_ok = 1
 
-if WT_UNIT0 = 1 then
+if SWB_UNIT0 = 1 then
     wt_up0 = 0
     sendln "echo PORTS0=$(bcmcmd -n 0 -c ps | grep -w up | wc -l)"
     waitregex "PORTS0=[ ]*([0-9]+)"
@@ -64,7 +66,7 @@ if WT_UNIT0 = 1 then
     endif
 endif
 
-if WT_UNIT1 = 1 then
+if SWB_UNIT1 = 1 then
     wt_up1 = 0
     sendln "echo PORTS1=$(bcmcmd -n 1 -c ps | grep -w up | wc -l)"
     waitregex "PORTS1=[ ]*([0-9]+)"