Pim van Pelt a3dc56c014 Force a sync of interfaces when VPP phy changes state ...

When Linux changes link on a master interface, all of its children also change.
This is not true in VPP, where bringing down a phy while its sub-ints are up
will not change link on the sub-ints.

We are forced to undo that change by walking the sub-interfaces of a phy and
syncing their state back into linux.

For simplicity, just walk all interfaces, as others will be a no-op.

The approach may have to be revisited once netlink messages are
consumed, to ensure there is not an oscillation where netlink sets a
link, which forces all links to be reset, generating more netlink
messages, etc. Care should be taken when netlink consumption comes into
play!

DBGvpp# create sub TenGigabitEthernet3/0/0 1
DBGvpp# lcp create TenGigabitEthernet3/0/0 host-if e0
DBGvpp# lcp create TenGigabitEthernet3/0/0.1 host-if e0.1
593: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0  up
593: e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UNKNOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0.1 up
593: e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UNKNOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0 down
593: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0 up
DBGvpp# set int state TenGigabitEthernet3/0/0.1 down
593: e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0 down
593: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

2021-08-13 14:33:03 +02:00

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