netdev - Re: [PATCH bpf-next v5 0/6] xdp: Add devmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 08 Aug 2019 21:30:39 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Björn Töpel 
        <bjorn.topel@...il.com>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf-next v5 0/6] xdp: Add devmap_hash map type

Alexei Starovoitov <alexei.starovoitov@...il.com> writes:

> On Fri, Jul 26, 2019 at 9:06 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>>
>> This series adds a new map type, devmap_hash, that works like the existing
>> devmap type, but using a hash-based indexing scheme. This is useful for the use
>> case where a devmap is indexed by ifindex (for instance for use with the routing
>> table lookup helper). For this use case, the regular devmap needs to be sized
>> after the maximum ifindex number, not the number of devices in it. A hash-based
>> indexing scheme makes it possible to size the map after the number of devices it
>> should contain instead.
>>
>> This was previously part of my patch series that also turned the regular
>> bpf_redirect() helper into a map-based one; for this series I just pulled out
>> the patches that introduced the new map type.
>>
>> Changelog:
>>
>> v5:
>>
>> - Dynamically set the number of hash buckets by rounding up max_entries to the
>>   nearest power of two (mirroring the regular hashmap), as suggested by Jesper.
>
> fyi I'm waiting for Jesper to review this new version.

Ping Jesper? :)

-Toke