https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205050
Bug ID: 205050
Summary: VLAN_MTU required by smsc driver
Product: Base System
Version: 11.0-CURRENT
Hardware: arm
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 163881
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=163881&action=edit
patch to sys/dev/usb/net/if_smsc.c
When setting up VLANs on a Raspberry Pi ethernet port, the MTU drops from 1500
to 1496 bytes. The MTU should remain at 1500, extending the frame size as per
IEEE 802.3. Adding IFCAP_VLAN_MTU to the if_capabilities field in the smsc
driver solves the problem. The datasheet for the LAN9512 chip, section 3.2.3
states that the chip supports the extended frame. Trivial patch attached.
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