From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: Andrii Nakryiko <andriin@fb.com>
Cc: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
<daniel@iogearbox.net>, <andrii.nakryiko@gmail.com>,
<kernel-team@fb.com>
Subject: Re: [PATCH v2 bpf-next 2/3] libbpf: make global data internal arrays mmap()-able, if possible
Date: Mon, 11 Nov 2019 10:40:57 -0800 [thread overview]
Message-ID: <20191111104057.0a9dfd84@cakuba> (raw)
In-Reply-To: <20191109080633.2855561-3-andriin@fb.com>
On Sat, 9 Nov 2019 00:06:31 -0800, Andrii Nakryiko wrote:
> +static int bpf_object__probe_array_mmap(struct bpf_object *obj)
> +{
> + struct bpf_create_map_attr attr = {
> + .map_type = BPF_MAP_TYPE_ARRAY,
> + .map_flags = BPF_F_MMAPABLE,
> + .key_size = sizeof(int),
> + .value_size = sizeof(int),
> + .max_entries = 1,
> + };
> + int fd = bpf_create_map_xattr(&attr);
> +
> + if (fd >= 0) {
The point of the empty line between variable declarations and code in
the Linux coding style is to provide a visual separation between
variables and code.
If you call a complex function in variable init and then check for
errors in the code that really breaks that principle.
> + obj->caps.array_mmap = 1;
> + close(fd);
> + return 1;
> + }
> +
> + return 0;
> +}
next prev parent reply other threads:[~2019-11-11 18:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-09 8:06 [PATCH v2 bpf-next 0/3] Add support for memory-mapping BPF array maps Andrii Nakryiko
2019-11-09 8:06 ` [PATCH v2 bpf-next 1/3] bpf: add mmap() support for BPF_MAP_TYPE_ARRAY Andrii Nakryiko
2019-11-11 16:40 ` Song Liu
2019-11-11 18:37 ` Jakub Kicinski
2019-11-12 2:06 ` Andrii Nakryiko
2019-11-12 19:17 ` Jakub Kicinski
2019-11-12 22:03 ` Andrii Nakryiko
2019-11-12 22:38 ` Jakub Kicinski
2019-11-13 3:19 ` Andrii Nakryiko
2019-11-11 18:39 ` Jakub Kicinski
2019-11-12 2:01 ` Andrii Nakryiko
2019-11-09 8:06 ` [PATCH v2 bpf-next 2/3] libbpf: make global data internal arrays mmap()-able, if possible Andrii Nakryiko
2019-11-11 18:40 ` Jakub Kicinski [this message]
2019-11-12 2:11 ` Andrii Nakryiko
2019-11-09 8:06 ` [PATCH v2 bpf-next 3/3] selftests/bpf: add BPF_TYPE_MAP_ARRAY mmap() tests Andrii Nakryiko
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