[xcvrd][media_settings] Add changes to send Unreliable_los settings requirement for consumption by swss with warm-reboot flow

[vdahiya12]

Description

The key change adds support for selectively applying the unreliable_los media setting to APP_DB, controlled via a new boolean argument is_unreliable_los_setting_required in the notify_media_setting() function

During link shutdown orchagent will use this setting to make sure that during a port flap, the orchagent applied the proper media settings after this has been consumed by orchagent.

Motivation and Context

How Has This Been Tested?

goes with sonic-net/sonic-swss#3663

The following test-scenarios was covered to see unreliable LOS is enabled and param phy_ctrl_unreliable_los is enabled in State DB:

• cold boot 100 times
• config reload
• xcvrd/pmon restart
• cold-reboot/swss restart
• apply manual settings in APP DB to ascertain change applies correctly
• Link shut/unshut 100 time, link comes up with the required settings.
• warm-reboot works as intended, link does not go down as well as settings is maintained

admin@sonic:~$ sudo redis-cli -n 0 hgetall "PORT_TABLE:Ethernet4"
 1) "admin_status"
 2) "up"
 3) "alias"
 4) "Ethernet2/1"
 5) "description"
 6) "Ethernet2/1"
 7) "index"
 8) "2"
 9) "lanes"
10) "65,66,67,68"
11) "mtu"
12) "9100"
13) "pfc_asym"
14) "off"
15) "speed"
16) "40000"
17) "oper_status"
18) "up"
19) "flap_count"
20) "3"
21) "last_up_time"
22) "Fri May 25 08:11:22 2025"
23) "interface_type"
24) "sr4"
25) "apply_unreliable_los"
26) "on"
27) "last_down_time"
28) "Fri May 25 08:11:10 202"
admin@sonic:~$ sudo redis-cli -n 6 hgetall "PORT_TABLE|Ethernet4"
 1) "state"
 2) "ok"
 3) "netdev_oper_status"
 4) "up"
 5) "admin_status"
 6) "up"
 7) "mtu"
 8) "9100"
 9) "supported_speeds"
10) "40000"
11) "supported_fecs"
12) "none,fc"
13) "host_tx_ready"
14) "true"
15) "speed"
16) "40000"
17) "fec"
18) "N/A"
19) "NPU_SI_SETTINGS_SYNC_STATUS"
20) "NPU_SI_SETTINGS_NOTIFIED"
21) "phy_ctrl_unreliable_los"
22) "true"

admin@sonic:~$ bcmcmd "phy diag xe17 dsc config" | grep -C 2 "LOS"
Brdfe_on                    = 0
Media Type                  = 2
Unreliable LOS              = 1
Scrambling Disable          = 0
CL93/72 Training Enable     = 0
--
Brdfe_on                    = 0
Media Type                  = 2
Unreliable LOS              = 1
Scrambling Disable          = 0
CL93/72 Training Enable     = 0
--
Brdfe_on                    = 0
Media Type                  = 2
Unreliable LOS              = 1
Scrambling Disable          = 0
CL93/72 Training Enable     = 0
--
Brdfe_on                    = 0
Media Type                  = 2
Unreliable LOS              = 1
Scrambling Disable          = 0
CL93/72 Training Enable     = 0
admin@str-7260cx3-acs-1:~$

Details if related
MSFT ADO

32883681
Tested on the testbed as well as UT

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