linux-kernel - Re: [PATCHv2] selftests: bpf: xskxceiver: ksft_print

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Date:   Wed, 8 Nov 2023 09:03:16 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] selftests: bpf: xskxceiver: ksft_print_msg: fix format
 type error

On Wed, Nov 8, 2023 at 3:00 AM Anders Roxell <anders.roxell@...aro.org> wrote:
>
> Crossbuilding selftests/bpf for architecture arm64, format specifies
> type error show up like.
>
> xskxceiver.c:912:34: error: format specifies type 'int' but the argument
> has type '__u64' (aka 'unsigned long long') [-Werror,-Wformat]
>  ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%d]\n",
>                                                                 ~~
>                                                                 %llu
>                 __func__, pkt->pkt_nb, meta->count);
>                                        ^~~~~~~~~~~
> xskxceiver.c:929:55: error: format specifies type 'unsigned long long' but
>  the argument has type 'u64' (aka 'unsigned long') [-Werror,-Wformat]
>  ksft_print_msg("Frag invalid addr: %llx len: %u\n", addr, len);
>                                     ~~~~             ^~~~
>
> Fixing the issues by casting to (unsigned long long) and changing the
> specifiers to be %llx, since with u64s it might be %llx or %lx,
> depending on architecture.
>
> Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> ---
>  tools/testing/selftests/bpf/xskxceiver.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
> index 591ca9637b23..1ab9512f5aa2 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.c
> +++ b/tools/testing/selftests/bpf/xskxceiver.c
> @@ -908,8 +908,9 @@ static bool is_metadata_correct(struct pkt *pkt, void *buffer, u64 addr)
>         struct xdp_info *meta = data - sizeof(struct xdp_info);
>
>         if (meta->count != pkt->pkt_nb) {
> -               ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%d]\n",
> -                              __func__, pkt->pkt_nb, meta->count);
> +               ksft_print_msg("[%s] expected meta_count [%d], got meta_count [%llx]\n",

why hex? %llu?

> +                              __func__, pkt->pkt_nb,
> +                              (unsigned long long)meta->count);
>                 return false;
>         }
>
> @@ -926,11 +927,13 @@ static bool is_frag_valid(struct xsk_umem_info *umem, u64 addr, u32 len, u32 exp
>
>         if (addr >= umem->num_frames * umem->frame_size ||
>             addr + len > umem->num_frames * umem->frame_size) {
> -               ksft_print_msg("Frag invalid addr: %llx len: %u\n", addr, len);
> +               ksft_print_msg("Frag invalid addr: %llx len: %u\n",
> +                              (unsigned long long)addr, len);
>                 return false;
>         }
>         if (!umem->unaligned_mode && addr % umem->frame_size + len > umem->frame_size) {
> -               ksft_print_msg("Frag crosses frame boundary addr: %llx len: %u\n", addr, len);
> +               ksft_print_msg("Frag crosses frame boundary addr: %llx len: %u\n",
> +                              (unsigned long long)addr, len);
>                 return false;
>         }
>
> @@ -1029,7 +1032,8 @@ static int complete_pkts(struct xsk_socket_info *xsk, int batch_size)
>                         u64 addr = *xsk_ring_cons__comp_addr(&xsk->umem->cq, idx + rcvd - 1);
>
>                         ksft_print_msg("[%s] Too many packets completed\n", __func__);
> -                       ksft_print_msg("Last completion address: %llx\n", addr);
> +                       ksft_print_msg("Last completion address: %llx\n",
> +                                      (unsigned long long)addr);
>                         return TEST_FAILURE;
>                 }
>
> @@ -1513,8 +1517,9 @@ static int validate_tx_invalid_descs(struct ifobject *ifobject)
>         }
>
>         if (stats.tx_invalid_descs != ifobject->xsk->pkt_stream->nb_pkts / 2) {
> -               ksft_print_msg("[%s] tx_invalid_descs incorrect. Got [%u] expected [%u]\n",
> -                              __func__, stats.tx_invalid_descs,
> +               ksft_print_msg("[%s] tx_invalid_descs incorrect. Got [%llx] expected [%u]\n",

should this be %llu? Or the switch to the hex was intentional?

> +                              __func__,
> +                              (unsigned long long)stats.tx_invalid_descs,
>                                ifobject->xsk->pkt_stream->nb_pkts);
>                 return TEST_FAILURE;
>         }
> --
> 2.42.0
>