netdev - Re: [PATCH bpf-next 0/6] Error handling when map lookup isn't supported

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Date:   Tue, 9 Oct 2018 02:43:46 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "David S . Miller" <davem@...emloft.net>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next 0/6] Error handling when map lookup isn't
 supported

On 10/09/2018 02:02 AM, Prashant Bhole wrote:
> On 10/6/2018 3:35 AM, Alexei Starovoitov wrote:
>> On Fri, Oct 05, 2018 at 12:35:55PM +0900, Prashant Bhole wrote:
>>> Currently when map a lookup fails, user space API can not make any
>>> distinction whether given key was not found or lookup is not supported
>>> by particular map.
>>>
>>> In this series we modify return value of maps which do not support
>>> lookup. Lookup on such map implementation will return -EOPNOTSUPP.
>>> bpf() syscall with BPF_MAP_LOOKUP_ELEM command will set EOPNOTSUPP
>>> errno. We also handle this error in bpftool to print appropriate
>>> message.
>>>
>>> Patch 1: adds handling of BPF_MAP_LOOKUP ELEM command of bpf syscall
>>> such that errno will set to EOPNOTSUPP when map doesn't support lookup
>>>
>>> Patch 2: Modifies the return value of map_lookup_elem() to EOPNOTSUPP
>>> for maps which do not support lookup
>>>
>>> Patch 3: Splits do_dump() in bpftool/map.c. Element printing code is
>>> moved out into new function dump_map_elem(). This was done in order to
>>> reduce deep indentation and accomodate further changes.
>>>
>>> Patch 4: Changes in bpftool to print strerror() message when lookup
>>> error is occured. This will result in appropriate message like
>>> "Operation not supported" when map doesn't support lookup.
>>>
>>> Patch 5: test_verifier: change fixup map naming convention as
>>> suggested by Alexei
>>>
>>> Patch 6: Added verifier tests to check whether verifier rejects call
>>> to bpf_map_lookup_elem from bpf program. For all map types those
>>> do not support map lookup.
>>
>> for the set:
>> Acked-by: Alexei Starovoitov <ast@...nel.org>
> 
> Thanks. Is there any reason this series did not get posted on netdev-list and can not be seen in the patchwork?

Hmm, could you repost to netdev? Perhaps a netdev or patchwork issue that
it did not land there. I just double-checked and it's indeed not present.

Thanks,
Daniel