netdev - Re: [PATCH bpf-next v5 11/17] selftests/bpf: Verify xdp_metadata xdp->af

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Date:   Tue, 3 Jan 2023 18:05:25 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 11/17] selftests/bpf: Verify xdp_metadata
 xdp->af_xdp path

On 12/22/22 8:06 PM, Stanislav Fomichev wrote:
>>> +     /* First half of umem is for TX. This way address matches 1-to-1
>>> +      * to the completion queue index.
>>> +      */
>>> +
>>> +     for (i = 0; i < UMEM_NUM / 2; i++) {
>>> +             addr = i * UMEM_FRAME_SIZE;
>>> +             printf("%p: tx_desc[%d] -> %lx\n", xsk, i, addr);
>> Do you still need this verbose printf which is in a loop?  Also, how about other
>> printf in this test?
> In case we'd ever need to debug this test, those printfs shouldn't
> hurt, right? Or are you concerned about this test polluting the output
> with something like 'test_progs -v -v' ?
> 

Asking just in case it was some left over from the earlier rfc that is no longer 
needed. I think only failure test get logged in CI, so I don't mind to leave 
them here if they will be useful to debug other earlier/later ASSERTs.