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

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Message-ID: <49b6c6b1-d66b-db0d-d866-9720b269c1a2@lab.ntt.co.jp>
Date:   Tue, 9 Oct 2018 09:02:15 +0900
From:   Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>
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 10/6/2018 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?