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Program MTU on vxlan routes #10103

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Description

This is a stepping stone for ebpf to move to a single vxlan device for
both v4/6. We do not want to set MTU on the device, but host networked
processes will need to know what the MTU should be.

routes targets can take MTU

It is sometimes handy to set explicitly what MTU should be used on a
certain route, for instance when a tunnel device is used for both ipv4/6
and the MTU is different each.

Related issues/PRs

Todos

  • Tests
  • Documentation
  • Release note

Release Note

TBD

Reminder for the reviewer

Make sure that this PR has the correct labels and milestone set.

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It is sometimes handy to set explicitly what MTU should be used on a
certain route, for instance when a tunnel device is used for both ipv4/6
and the MTU is different each.
This is a stepping stone for ebpf to move to a single vxlan device for
both v4/6. We do not want to set MTU on the device, but host networked
processes will need to know what the MTU should be.
@marvin-tigera marvin-tigera added this to the Calico v3.31.0 milestone Mar 28, 2025
@marvin-tigera marvin-tigera added release-note-required Change has user-facing impact (no matter how small) docs-pr-required Change is not yet documented labels Mar 28, 2025
@tomastigera tomastigera added docs-not-required Docs not required for this change release-note-not-required Change has no user-facing impact and removed release-note-required Change has user-facing impact (no matter how small) docs-pr-required Change is not yet documented labels Mar 28, 2025
@tomastigera tomastigera marked this pull request as ready for review March 28, 2025 20:32
@tomastigera tomastigera requested a review from a team as a code owner March 28, 2025 20:32
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