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[snappi] Derive TGEN link_training from DUT instead of hardcoding it #26889

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[snappi] Derive TGEN link_training from DUT instead of hardcoding it #26889

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21 changes: 20 additions & 1 deletion tests/common/snappi_tests/snappi_fixtures.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1208,7 +1208,26 @@
l1_config.speed = 'speed_{}_gbps'.format(speed_gbps)
l1_config.ieee_media_defaults = False
l1_config.auto_negotiate = False
if is_snappi_multidut(duthost_list):

# Derive link_training from DUT CONFIG_DB if available, otherwise use legacy defaults
lt_from_dut = None
try:
dut_for_lt = duthost_list[0] if duthost_list else None
if dut_for_lt:
run_facts = dut_for_lt.config_facts(host=dut_for_lt.hostname, source="running")['ansible_facts']
port_table = run_facts.get('PORT', {})
for sp in new_snappi_ports:
p = sp.get('peer_port')
lt_val = port_table.get(p, {}).get('link_training')
if lt_val is not None:
lt_from_dut = str(lt_val).lower() in ['on', 'true', 'yes', '1']
break
except Exception:
pass

if lt_from_dut is not None:
l1_config.auto_negotiation.link_training = lt_from_dut
elif is_snappi_multidut(duthost_list):
l1_config.auto_negotiation.link_training = False
else:
l1_config.auto_negotiation.link_training = True
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