Bug 205050
| Summary: | VLAN_MTU required by smsc driver | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Base System | Reporter: | rpp | ||||
| Component: | usb | Assignee: | freebsd-usb (Nobody) <usb> | ||||
| Status: | Closed FIXED | ||||||
| Severity: | Affects Only Me | CC: | hselasky | ||||
| Priority: | --- | Keywords: | patch | ||||
| Version: | CURRENT | ||||||
| Hardware: | arm | ||||||
| OS: | Any | ||||||
| See Also: | https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238665 | ||||||
| Attachments: |
|
||||||
A commit references this bug: Author: hselasky Date: Mon Dec 7 18:55:33 UTC 2015 New revision: 291953 URL: https://svnweb.freebsd.org/changeset/base/291953 Log: 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. Submitted by: rpp@ci.com.au MFC after: 1 week PR: 205050 Changes: head/sys/dev/usb/net/if_smsc.c A commit references this bug: Author: hselasky Date: Mon Dec 14 09:46:47 UTC 2015 New revision: 292185 URL: https://svnweb.freebsd.org/changeset/base/292185 Log: MFC r291953: 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. Submitted by: rpp@ci.com.au PR: 205050 Changes: _U stable/10/ stable/10/sys/dev/usb/net/if_smsc.c |
Created attachment 163881 [details] 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.