On 1/6/22 9:18 AM, Tyler Wear (QUIC) wrote:
-----Original Message-----
From: Yonghong Song <yhs@xxxxxx>
Sent: Wednesday, January 5, 2022 11:51 PM
To: Tyler Wear (QUIC) <quic_twear@xxxxxxxxxxx>; Martin KaFai Lau <kafai@xxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx; bpf@xxxxxxxxxxxxxxx; maze@xxxxxxxxxx
Subject: Re: [PATCH] Add skb_store_bytes() for BPF_PROG_TYPE_CGROUP_SKB
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On 1/4/22 4:27 PM, Tyler Wear (QUIC) wrote:
-----Original Message-----
From: Martin KaFai Lau <kafai@xxxxxx>
Sent: Wednesday, December 29, 2021 1:06 PM
To: Tyler Wear <twear@xxxxxxxxxxx>
Cc: Yonghong Song <yhs@xxxxxx>; Tyler Wear (QUIC)
<quic_twear@xxxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx;
bpf@xxxxxxxxxxxxxxx; maze@xxxxxxxxxx
Subject: Re: [PATCH] Add skb_store_bytes() for
BPF_PROG_TYPE_CGROUP_SKB
WARNING: This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable
macros.
On Wed, Dec 29, 2021 at 06:29:05PM +0000, Tyler Wear wrote:
Unable to run any bpf tests do to errors below. These occur with and without the new patch. Is this a known issue?
Is the new test case required since bpf_skb_store_bytes() is already a tested function for other prog types?
libbpf: failed to find BTF for extern 'bpf_testmod_invalid_mod_kfunc'
[18] section: -2
Error: failed to open BPF object file: No such file or directory
libbpf: failed to find BTF info for global/extern symbol 'my_tid'
Error: failed to link
'/local/mnt/workspace/linux-stable/tools/testing/selftests/bpf/linke
d_
funcs1.o': Unknown error -2 (-2)
libbpf: failed to find BTF for extern 'bpf_kfunc_call_test1' [27]
section: -2
tools/testing/selftests/bpf/README.rst has details on these.
Ensure the llvm and pahole are up to date.
Also take a look at the "Testing patches" and "LLVM" section in Documentation/bpf/bpf_devel_QA.rst.
This will also require adding the l3/l4_ csum_replace() api's then. Adding the csum_replace() to a cgroup test case results in the
below error during bpf program validation:
"BPF_LD_[ABS|IND] instructions not allowed for this program type"
I saw you posted a new patch, so it seems you have resolved this BPF_LD_[ABS|IND] issue. Do you know what is the reason for this
verification error? Here, the program type is cgroup_skb which should not mess up with BPF_LD_[ABS|IND] which is mostly for classic
bpf to extended bpf conversion. Did I miss anything here?
Was an issue with using bpf_legacy.h to load bytes.
Okay, I see. that makes sense. The helper bpf_skb_load_bytes() is the
way to go.
