netdev - Re: [RESEND] test_verifier #13 fails on arm64: "retval 65507 != -29"

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Date:   Wed, 10 Jul 2019 16:14:39 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Paolo Pisati <p.pisati@...il.com>, Yonghong Song <yhs@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [RESEND] test_verifier #13 fails on arm64: "retval 65507 != -29"

> > Reading csum_partial/csum_fold, seems like after calculation of
> > checksum (so-called unfolded checksum), it is supposed to be passed
> > into csum_fold() to convert it into 16-bit one and invert.

Yes, you always need to fold at the end.

The low level code does fold sometimes, but not always.

-Andi