Re: [PATCH 2/2] [e1000 VLAN] Disable vlan hw accel when promiscuous mode

Chris Friesen wrote:

David Miller wrote:

quoted

When you select VLAN, you by definition are asking for non-VLAN
traffic to be elided.  It is like plugging the ethernet cable
into one switch or another.

For max functionality it seems like the raw eth device should show
everything on the wire in promiscuous mode.

If we want to sniff only the traffic for a specific vlan, we can sniff
the vlan device.

actually the impact can be quite negative, imagine doing a tcpdump on a 10gig
interface with vlan's enabled - all of a sudden you might accidentally flood the
system with a 100-fold increase in traffic and force the stack to dump all those
packets for you.

I'm still very reluctant about this patch, I think the current situation is OK for
everyone and offers everyone the possibility to do what they need, without hidden
consequences.

Auke

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