Re: [PATCH net-next v2 0/5] ila: Optimization to preserve value of early demux

From: Tom Herbert <redacted>
Date: Thu, 3 Dec 2015 11:59:31 -0800

On Thu, Dec 3, 2015 at 11:48 AM, David Miller [off-list ref] wrote:

quoted

From: Tom Herbert <redacted>
Date: Tue, 1 Dec 2015 15:11:07 -0800

quoted

ip6tables -t mangle -A PREROUTING --dst 2001:0:0:33::/64 -j ILAIN

The user should have to do anything like this in order to just get
proper working functionality of ILA.

It should just work transparently.

This was transparent in the previously posted patch "ila: Add support
for netfilter NF_INET_PRE_ROUTING hook", but there was significant
pushback that NF interface was not intended for this purpose. Using an
IP tables target like this should preserve the sanctity of the
interfaces and does provide nice performance improvement since
PREROUTING is done before early demux. The NF_INET_PRE_ROUTING hook is
still better performance though and what we are using internally (just
an incremental change on top of these patches).

You want to make a transformation before early demux, which edits the
packet.

But someone who configures ILA and just wants reasonable performance
shouldn't have to configure anything explicitly outside of the ILA
config itself.

So again, those are your operating constraints.