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When setting up VLANs on a Raspberry Pi ethernet port, the MTU drops

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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
This commit is contained in:
Hans Petter Selasky 2015-12-07 18:55:33 +00:00
parent 1c2a618bbf
commit 4da9ba7e7f
1 changed files with 1 additions and 1 deletions
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2
sys/dev/usb/net/if_smsc.c
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@ -1707,7 +1707,7 @@ smsc_attach_post_sub(struct usb_ether *ue)
/* 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?)