freebsd stable - Apr 2016 - VLAN problem on some em(4) cards

Hi!
> while replacing a switch I ran into a problem with using 802.1q VLANs
> (vlan(4)) on a em(4) card - that is, I could not get the card to work
> with VLANs.
Have you tried fiddeling with the flags ?

options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>

examples:

ifconfig em0 -rxcsum -txcsum -wol
ifconfig em0 -vlanmtu -vlanhwtag

I have a 10.3-i386 box with 82574L and VLANs on that interface,
works fine (but I'm not using it for production, only as a test box).

Can you show

sysctl -a | grep dev.em | grep desc

I have:

dev.em.5.%desc: Intel(R) PRO/1000 Legacy Network Connection 1.1.0
dev.em.4.%desc: Intel(R) PRO/1000 Legacy Network Connection 1.1.0
dev.em.3.%desc: Intel(R) PRO/1000 Network Connection 7.6.1-k
dev.em.2.%desc: Intel(R) PRO/1000 Network Connection 7.6.1-k
dev.em.1.%desc: Intel(R) PRO/1000 Network Connection 7.6.1-k
dev.em.0.%desc: Intel(R) PRO/1000 Network Connection 7.6.1-k

-- 
pi at opsec.eu            +49 171 3101372                         4 years to go
!

## Kurt Jaeger (lists at opsec.eu):
> Have you tried fiddeling with the flags ?
> 
>
options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
> 
> examples:
> 
> ifconfig em0 -rxcsum -txcsum -wol
> ifconfig em0 -vlanmtu -vlanhwtag
I hadn't touched WOL, but almost everything else.
I also tried sysctl net.link.vlan.soft_pad (no effect, either).
> sysctl -a | grep dev.em | grep desc
dev.em.0.interrupts.rx_desc_min_thresh: 0
dev.em.0.queue_tx_0.no_desc_avail: 0
dev.em.0.%desc: Intel(R) PRO/1000 Network Connection 7.6.1-k

This is the same for the non-working (82574L) and working (82579LM)
interfaces - that's why I though lspci would be more interesting.

Regards,
Christoph

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