netdev - Re: [PATCH v3 bpf-next 8/8] selftests/bpf: introduce XDP compliance test tool

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Message-ID: <a208ed96-20e5-43d3-13e9-122776230da1@linux.dev>
Date:   Fri, 27 Jan 2023 00:19:54 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, toke@...hat.com, memxor@...il.com,
        alardam@...il.com, saeedm@...dia.com, anthony.l.nguyen@...el.com,
        gospo@...adcom.com, vladimir.oltean@....com, nbd@....name,
        john@...ozen.org, leon@...nel.org, simon.horman@...igine.com,
        aelior@...vell.com, christophe.jaillet@...adoo.fr,
        ecree.xilinx@...il.com, mst@...hat.com, bjorn@...nel.org,
        magnus.karlsson@...el.com, maciej.fijalkowski@...el.com,
        intel-wired-lan@...ts.osuosl.org, lorenzo.bianconi@...hat.com,
        sdf@...gle.com
Subject: Re: [PATCH v3 bpf-next 8/8] selftests/bpf: introduce XDP compliance
 test tool

On 1/26/23 10:36 AM, sdf@...gle.com wrote:
> 
>> +    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
>> +    if (sockfd < 0) {
>> +        fprintf(stderr, "Failed to create echo socket\n");
>> +        return -errno;
>> +    }
>> +
>> +    err = setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &optval,
>> +             sizeof(optval));
>> +    if (err < 0) {
>> +        fprintf(stderr, "Failed sockopt on echo socket\n");
>> +        return -errno;
>> +    }
>> +
>> +    err = bind(sockfd, (struct sockaddr *)&addr, sizeof(addr));
>> +    if (err) {
>> +        fprintf(stderr, "Failed to bind echo socket\n");
>> +        return -errno;
>> +    }
> 
> IIRC, Martin mentioned IPv6 support in the previous version. Should we
> also make the userspace v6 aware by at least using AF_INET6 dualstack
> sockets? I feel like listening on inaddr_any with AF_INET6 should
> get us there without too much pain..

Yeah. Think about host that only has IPv6 address. A tool not supporting IPv6 is 
a no-go nowadays.