netdev - Re: [PATCH v7 0/6] Add eBPF hooks for cgroups

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Message-Id: <20161101.113833.983996221243204456.davem@davemloft.net>
Date:   Tue, 01 Nov 2016 11:38:33 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     lorenzo@...gle.com
Cc:     daniel@...earbox.net, alexei.starovoitov@...il.com,
        daniel@...que.org, pablo@...filter.org, htejun@...com, ast@...com,
        kafai@...com, fw@...len.de, harald@...hat.com,
        netdev@...r.kernel.org, sargun@...gun.me, cgroups@...r.kernel.org
Subject: Re: [PATCH v7 0/6] Add eBPF hooks for cgroups

From: Lorenzo Colitti <lorenzo@...gle.com>
Date: Wed, 2 Nov 2016 00:25:15 +0900

> That way, if you want to modify the packet or do something
> sophisticated in netfilter, you can still use the eBPF hook on the
> results of that operation, and if you don't want to run netfilter, you
> can write netfilter rules to skip the packet (and maybe still fix it
> up later, perhaps in another netfilter chain).

The downside is that we classify the packet twice.  This transactional
cost adds up rather quickly.