[release-v3.28] Auto pick #8922: set MTU on bpfin/out.cali to match host #8954
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Set the MTU to match the smallest MTU of the host devices as per the current autodetection. That makes sure that if large MTU is used, the extra device does not create a bottleneck with a small MTU. Also when MTU changes, on host devices, it get adjusted automatically. If an overlay is used, the special device MTU is adjusted to the size of the overlay. Fixes projectcalico#8918
tomastigera
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tomastigera
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Cherry pick of #8922 on release-v3.28.
#8922: set MTU on bpfin/out.cali to match host
Original PR Body below
Set the MTU to match the smallest MTU of the host devices as per the current autodetection. That makes sure that if large MTU is used, the extra device does not create a bottleneck with a small MTU. Also when MTU changes, on host devices, it get adjusted automatically. If an overlay is used, the special device MTU is adjusted to the size of the overlay.
Fixes #8868
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