Author: hselasky
Date: Mon Dec 7 18:55:33 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: r...@ci.com.au
MFC after: 1 week
PR: 205050
Modified:
head/sys/dev/usb/net/if_smsc.c
Modified: head/sys/dev/usb/net/if_smsc.c
==============================================================================
--- head/sys/dev/usb/net/if_smsc.c Mon Dec 7 18:45:55 2015
(r291952)
+++ head/sys/dev/usb/net/if_smsc.c Mon Dec 7 18:55:33 2015
(r291953)
@@ -1707,7 +1707,7 @@ smsc_attach_post_sub(struct usb_ether *u
/* The chip supports TCP/UDP checksum offloading on TX and RX paths,
however
* currently only RX checksum is supported in the driver (see top of
file).
*/
- ifp->if_capabilities |= IFCAP_RXCSUM;
+ ifp->if_capabilities |= IFCAP_RXCSUM | IFCAP_VLAN_MTU;
ifp->if_hwassist = 0;
/* TX checksuming is disabled (for now?)
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