netdev - Re: [PATCH bpf-next v14 2/2] selftests/bpf: test for bpf_get_fd

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Date:   Wed, 18 Dec 2019 03:27:34 +0000
From:   Yonghong Song <yhs@...com>
To:     Wenbo Zhang <ethercflow@...il.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
CC:     "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "bgregg@...flix.com" <bgregg@...flix.com>,
        "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v14 2/2] selftests/bpf: test for
 bpf_get_fd_path() from tracepoint



On 12/17/19 4:56 PM, Wenbo Zhang wrote:
> trace fstat events by tracepoint syscalls/sys_enter_newfstat, and handle
> events only produced by test_file_fd_path, which call fstat on several
> different types of files to test bpf_fd_file_path's feature.
> 
> v5->v6: addressed Gregg and Yonghong's feedback
> - rename to get_fd_path
> - change sys_enter_newfstat_args's fd type to long to fix issue on
> big-endian machines
> 
> v4->v5: addressed Andrii's feedback
> - pass NULL for opts as bpf_object__open_file's PARAM2, as not really
> using any
> - modify patch subject to keep up with test code
> - as this test is single-threaded, so use getpid instead of SYS_gettid
> - remove unnecessary parens around check which after if (i < 3)
> - in kern use bpf_get_current_pid_tgid() >> 32 to fit getpid() in
> userspace part
> - with the patch adding helper as one patch series
> 
> v3->v4: addressed Andrii's feedback
> - use a set of fd instead of fds array
> - use global variables instead of maps (in v3, I mistakenly thought that
> the bpf maps are global variables.)
> - remove uncessary global variable path_info_index
> - remove fd compare as the fstat's order is fixed
> 
> v2->v3: addressed Andrii's feedback
> - use global data instead of perf_buffer to simplified code
> 
> v1->v2: addressed Daniel's feedback
> - rename bpf_fd2path to bpf_get_file_path to be consistent with other
> helper's names
> 
> Signed-off-by: Wenbo Zhang <ethercflow@...il.com>

Acked-by: Yonghong Song <yhs@...com>