netdev - Re: [PATCH bpf] selftests/bpf: Fix xdp_synproxy compilation failure in 32-bit arch

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Date:   Fri, 11 Nov 2022 11:11:37 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     Yonghong Song <yhs@...a.com>, <ast@...nel.org>,
        <daniel@...earbox.net>, <davem@...emloft.net>, <kuba@...nel.org>,
        <hawk@...nel.org>, <john.fastabend@...il.com>, <andrii@...nel.org>,
        <martin.lau@...ux.dev>, <song@...nel.org>, <yhs@...com>,
        <kpsingh@...nel.org>, <sdf@...gle.com>, <haoluo@...gle.com>,
        <jolsa@...nel.org>, <mykolal@...com>, <shuah@...nel.org>,
        <tariqt@...dia.com>, <maximmi@...dia.com>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf] selftests/bpf: Fix xdp_synproxy compilation failure
 in 32-bit arch

Hello,

On 2022/11/8 23:59, Yonghong Song wrote:
> 
> 
> On 11/8/22 5:12 AM, Yang Jihong wrote:
>> xdp_synproxy fails to be compiled in the 32-bit arch, log is as follows:
>>
>>    xdp_synproxy.c: In function 'parse_options':
>>    xdp_synproxy.c:175:36: error: left shift count >= width of type 
>> [-Werror=shift-count-overflow]
>>      175 |                 *tcpipopts = (mss6 << 32) | (ttl << 24) | 
>> (wscale << 16) | mss4;
>>          |                                    ^~
>>    xdp_synproxy.c: In function 'syncookie_open_bpf_maps':
>>    xdp_synproxy.c:289:28: error: cast from pointer to integer of 
>> different size [-Werror=pointer-to-int-cast]
>>      289 |                 .map_ids = (__u64)map_ids,
>>          |                            ^
>>
>> Fix it.
>>
>> Fixes: fb5cd0ce70d4 ("selftests/bpf: Add selftests for raw syncookie 
>> helpers")
>> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
>> ---
>>   tools/testing/selftests/bpf/xdp_synproxy.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/testing/selftests/bpf/xdp_synproxy.c 
>> b/tools/testing/selftests/bpf/xdp_synproxy.c
>> index ff35320d2be9..45fef01a87a8 100644
>> --- a/tools/testing/selftests/bpf/xdp_synproxy.c
>> +++ b/tools/testing/selftests/bpf/xdp_synproxy.c
>> @@ -172,7 +172,7 @@ static void parse_options(int argc, char *argv[], 
>> unsigned int *ifindex, __u32 *
>>       if (tcpipopts_mask == 0xf) {
>>           if (mss4 == 0 || mss6 == 0 || wscale == 0 || ttl == 0)
>>               usage(argv[0]);
>> -        *tcpipopts = (mss6 << 32) | (ttl << 24) | (wscale << 16) | mss4;
>> +        *tcpipopts = ((unsigned long long)mss6 << 32) | (ttl << 24) | 
>> (wscale << 16) | mss4;
> 
> This looks weird. Maybe we should define mss6 as unsigned long long to 
> avoid this casting at all?
OK, will fix in next version.

Thanks,
Yang