netdev - Re: [PATCH bpf-next 03/10] tools/bpf: handle __MAX_BPF_(PROG|MAP)

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Date:   Wed, 28 Aug 2019 18:19:16 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Julia Kartseva <hex@...com>
Cc:     rdna@...com, bpf@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH bpf-next 03/10] tools/bpf: handle
 __MAX_BPF_(PROG|MAP)_TYPE in switch statements

Em Wed, Aug 28, 2019 at 02:03:06PM -0700, Julia Kartseva escreveu:
> Add cases to switch statements in probe_load, bpf_prog_type__needs_kver
> bpf_probe_map_type to fix enumeration value not handled in switch
> compilation error.
> prog_type_name array in bpftool/main.h doesn't have __MAX_BPF_PROG_TYPE
> entity, same for map, so probe won't be called.

Shouldn't this be added when adding that __MAX_BPF_PROG_TYPE value to
the enum? Otherwise the build will fail when __MAX_BPF_PROG_TYPE is
added but not handled in the switches.

I.e. the tree should build patch by patch, not just at the end of patch
series.

- Arnaldo
 
> Signed-off-by: Julia Kartseva <hex@...com>
> ---
>  tools/lib/bpf/libbpf.c        | 1 +
>  tools/lib/bpf/libbpf_probes.c | 2 ++
>  2 files changed, 3 insertions(+)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 2233f919dd88..72e6e5eb397f 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -3580,6 +3580,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
>  	case BPF_PROG_TYPE_PERF_EVENT:
>  	case BPF_PROG_TYPE_CGROUP_SYSCTL:
>  	case BPF_PROG_TYPE_CGROUP_SOCKOPT:
> +	case __MAX_BPF_PROG_TYPE:
>  		return false;
>  	case BPF_PROG_TYPE_KPROBE:
>  	default:
> diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
> index 4b0b0364f5fc..8f2ba6a457ac 100644
> --- a/tools/lib/bpf/libbpf_probes.c
> +++ b/tools/lib/bpf/libbpf_probes.c
> @@ -102,6 +102,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
>  	case BPF_PROG_TYPE_FLOW_DISSECTOR:
>  	case BPF_PROG_TYPE_CGROUP_SYSCTL:
>  	case BPF_PROG_TYPE_CGROUP_SOCKOPT:
> +	case __MAX_BPF_PROG_TYPE:
>  	default:
>  		break;
>  	}
> @@ -250,6 +251,7 @@ bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
>  	case BPF_MAP_TYPE_XSKMAP:
>  	case BPF_MAP_TYPE_SOCKHASH:
>  	case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
> +	case __MAX_BPF_MAP_TYPE:
>  	default:
>  		break;
>  	}
> -- 
> 2.17.1

-- 

- Arnaldo