netdev - Re: Ask for help about bpf map

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Date:   Wed, 14 Jul 2021 10:02:10 +0800
From:   "luwei (O)" <luwei32@...wei.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
CC:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        David Ahern <dahern@...italocean.com>
Subject: Re: Ask for help about bpf map

I tried 5.13 version in this page: 
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git , still 
failed with the same error.

在 2021/7/14 9:05 AM, luwei (O) 写道:
> I have updated the iproute2 according this page: 
> https://github.com/cilium/cilium/issues/7446
>
> Now I use this version of iproute2: 
> https://github.com/shemminger/iproute2
>
> The version of iproute2 is 5.11, and the kernel version is 5.13(the 
> latest version).
>
>
> 在 2021/7/14 1:07 AM, Toke Høiland-Jørgensen 写道:
>> Andrii Nakryiko <andrii.nakryiko@...il.com> writes:
>>
>>> On Mon, Jul 12, 2021 at 11:35 PM luwei (O) <luwei32@...wei.com> wrote:
>>>> Hi, List:
>>>>
>>>>         I am a beginner about bpf and working on XDP now. I meet a
>>>> problem and feel difficult to figure it out.
>>>>
>>>>         In my following codes, I use two ways to define my_map: in SEC
>>>> maps and SEC .maps respectively. When I load the xdp_kern.o file,
>>>>
>>>> It has different results. The way I load is: ip link set dev ens3 xdp
>>>> obj xdp1_kern.o sec xdp1.
>>>>
>>>>         when I define my_map using SEC maps, it loads successfully but
>>>> fails to load using SEC .maps, it reports:
>>>>
>>>> "
>>>>
>>>> [12] TYPEDEF __u32 type_id=13
>>>> [13] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none)
>>>> [14] FUNC_PROTO (anon) return=2 args=(10 ctx)
>>>> [15] FUNC xdp_prog1 type_id=14
>>>> [16] INT char size=1 bits_offset=0 nr_bits=8 encoding=SIGNED
>>>> [17] ARRAY (anon) type_id=16 index_type_id=4 nr_elems=4
>>>> [18] VAR _license type_id=17 linkage=1
>>>> [19] DATASEC .maps size=0 vlen=1 size == 0
>>>>
>>>>
>>>> Prog section 'xdp1' rejected: Permission denied (13)!
>>>>    - Type:         6
>>>>    - Instructions: 9 (0 over limit)
>>>>    - License:      GPL
>>>>
>>>> Verifier analysis:
>>>>
>>>> 0: (b7) r1 = 0
>>>> 1: (63) *(u32 *)(r10 -4) = r1
>>>> last_idx 1 first_idx 0
>>>> regs=2 stack=0 before 0: (b7) r1 = 0
>>>> 2: (bf) r2 = r10
>>>> 3: (07) r2 += -4
>>>> 4: (18) r1 = 0x0
>>> this shouldn't be 0x0.
>>>
>>> I suspect you have an old iproute2 which doesn't yet use libbpf to
>>> load BPF programs, so .maps definition is not yet supported. cc'ing
>>> netdev@...r, David and Toke
>> That would be my guess as well; what's the output of 'ip -V'?
>>
>> -Toke
>>
>> .
>
-- 
Best Regards,
Lu Wei