linux-kernel - Re: [RFC -next v0 1/3] bpf: modular maps

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Date:   Tue, 27 Nov 2018 21:10:03 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Aaron Conole <aconole@...heb.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Brouer <brouer@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Andy Gospodarek <andy@...yhouse.net>,
        Rony Efraim <ronye@...lanox.com>,
        Simon Horman <horms@...ge.net.au>,
        Marcelo Leitner <marcelo.leitner@...il.com>
Subject: Re: [RFC -next v0 1/3] bpf: modular maps

On Tue, Nov 27, 2018 at 09:24:05AM -0500, Aaron Conole wrote:
> 
>   1. Introduce flowmap again, this time, basically having it close to a
>      copy of the hashmap.  Introduce a few function calls that allow an
>      external module to easily manipulate all maps of that type to insert
>      / remove / update entries.  This makes it similar to, for example,
>      devmap.

what is a flowmap?
How is this flowmap different from existing hash, lpm and lru maps?
'close to a copy of hashmap'... why hashmap is not enough for your purpose?