[action] [PR:22008] [chassis][multi-asic]: Add support for vendor LC ip range for macvlan ip

[mssonicbld]

Signed-off-by: Anand Mehra [email protected]

Why I did it

As per current design, macvlan IP start with an offset of 10 from miplane Ip subnet base ip on a namespace.
In some platforms this may cause conflict if the LC midplane ip for any slot falls in that range. The IP conflict cause midplane traffic loss.

In Cisco Chassis, macvlan IP may conflict with LC midplane IP range. This conflict causes midplane traffic loss for conflicting ip and affects any LC namespace transaction with Supervisor.

To prevent any conflict, Venddor may provide an offset to be used to generate macvlan IP address to prevent any conflict with midplane IP address.

Work item tracking

• Microsoft ADO (31798758):

How I did it

Added an ip_offset value which Vendor may provide based on their midplane ip range to generate safe IP address for macvlan in namespace.

The lc_ip_offset offset needs to be set in /usr/share/sonic/device//chassisdb.conf file for the LC where an offset is required.

cat chassisdb.conf
chassis_db_address=127.0.0.3
midplane_subnet=127.0.0.0/16
lc_ip_offset=100

How to verify it

After boot, check eth1 IP address in namespaces. The IP addresses should not conflict with any expected LC eth1-midplane IP or any other IP in the system.

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305
• 202405
• 202411

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

journalctl ouptput from database@0
Mar 10 05:36:43 sonic database.sh[2454102]: + ip link set dev ns-eth1asic0 netns asic0
Mar 10 05:36:43 sonic database.sh[2454102]: + ip netns exec asic0 ip link set ns-eth1asic0 name eth1
Mar 10 05:36:43 sonic database.sh[2454102]: + [[ -n 100 ]]
Mar 10 05:36:43 sonic database.sh[2454102]: + ip_offset=100
Mar 10 05:36:43 sonic database.sh[2454808]: ++ echo 1.0.0.0/16
Mar 10 05:36:43 sonic database.sh[2454809]: ++ awk -F. '{print $1 "." $2}'
Mar 10 05:36:43 sonic database.sh[2454102]: + slot_ip_address=1.0.1.100
Mar 10 05:36:43 sonic database.sh[2454102]: + slot_subnet_mask=16
Mar 10 05:36:43 sonic database.sh[2454102]: + ip netns exec asic0 ip addr add 1.0.1.100/16 dev eth1
Mar 10 05:36:43 sonic database.sh[2454102]: + ip netns exec asic0 ip link set dev eth1 up
Mar 10 05:36:43 sonic database.sh[2454102]: + [[ 1.0.0.0/16 != \1\.\0\.\0\.\0\/\1\6 ]]
Mar 10 05:36:43 sonic database.sh[2454102]: + ebtables_config
Mar 10 05:36:43 sonic database.sh[2454102]: + [[ -n 0 ]]
Mar 10 05:36:43 sonic database.sh[2454102]: + [[ '' != \d\p\u\d\b ]]
Mar 10 05:36:43 sonic database.sh[2454102]: + ip netns exec asic0 ebtables-restore
Mar 10 05:36:43 sonic database.sh[2454102]: + [[ '' != \c\h\a\s\s\i\s\d\b ]]
Mar 10 05:36:43 sonic database.sh[2454102]: + waitForAllInstanceDatabaseConfigJsonFilesReady

root@sonic:/home/cisco# ip netns exec asic0 ifconfig eth1
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 1.0.0.100  netmask 255.255.0.0  broadcast 0.0.0.0
        RX packets 161  bytes 13091 (12.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 100  bytes 8490 (8.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@sonic:/home/cisco# ip netns exec asic1 ifconfig eth1
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 1.0.0.101  netmask 255.255.0.0  broadcast 0.0.0.0
        RX packets 166  bytes 13417 (13.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 99  bytes 8304 (8.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@sonic:/home/cisco# ip netns exec asic1 sonic-db-cli PING
PONG
root@sonic:/home/cisco# ip netns exec asic0 sonic-db-cli PING
PONG
root@sonic:/home/cisco# ifconfig eth1-midplane
eth1-midplane: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 1.0.0.1  netmask 255.255.0.0  broadcast 1.0.255.255
        RX packets 4855267  bytes 692674212 (660.5 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6112503  bytes 1094211643 (1.0 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@sonic:/home/cisco# show chassis modules midplane-status
       Name    IP-Address    Reachability
-----------  ------------  --------------
 LINE-CARD0       1.0.0.1           False
 LINE-CARD1       1.0.0.2            True
 LINE-CARD2       1.0.0.3           False
 LINE-CARD3       1.0.0.4           False
 LINE-CARD4       1.0.0.5           False
 LINE-CARD5       1.0.0.6           False
 LINE-CARD6       1.0.0.7           Fals

[mssonicbld]

Original PR: #22008

[mssonicbld]

/azp run Azure.sonic-buildimage

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