From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: bpf <bpf@vger.kernel.org>, "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
"Network Development" <netdev@vger.kernel.org>
Subject: Re: [PATCH bpf-next v5 08/12] libbpf: Make gen_loader data aligned.
Date: Wed, 29 Sep 2021 13:50:54 -0700 [thread overview]
Message-ID: <CAADnVQKnoFc=_jKNH=8-HWYuEw=FP941igh5Y1OgtQjdnoFLTw@mail.gmail.com> (raw)
In-Reply-To: <20210927145941.1383001-9-memxor@gmail.com>
On Mon, Sep 27, 2021 at 8:00 AM Kumar Kartikeya Dwivedi
<memxor@gmail.com> wrote:
>
> From: Alexei Starovoitov <ast@kernel.org>
>
> Align gen_loader data to 8 byte boundary to make sure union bpf_attr,
> bpf_insns and other structs are aligned.
>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
> ---
> tools/lib/bpf/gen_loader.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c
> index 8df718a6b142..80087b13877f 100644
> --- a/tools/lib/bpf/gen_loader.c
> +++ b/tools/lib/bpf/gen_loader.c
> @@ -5,6 +5,7 @@
> #include <string.h>
> #include <errno.h>
> #include <linux/filter.h>
> +#include <sys/param.h>
> #include "btf.h"
> #include "bpf.h"
> #include "libbpf.h"
> @@ -135,13 +136,17 @@ void bpf_gen__init(struct bpf_gen *gen, int log_level)
>
> static int add_data(struct bpf_gen *gen, const void *data, __u32 size)
> {
> + __u32 size8 = roundup(size, 8);
> + __u64 zero = 0;
> void *prev;
>
> - if (realloc_data_buf(gen, size))
> + if (realloc_data_buf(gen, size8))
> return 0;
> prev = gen->data_cur;
> memcpy(gen->data_cur, data, size);
> gen->data_cur += size;
> + memcpy(gen->data_cur, &zero, size8 - size);
> + gen->data_cur += size8 - size;
Since we both need this patch, I pushed it to bpf-next to
simplify rebasing.
next prev parent reply other threads:[~2021-09-29 20:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-27 14:59 [PATCH bpf-next v5 00/12] Support kernel module function calls from eBPF Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 01/12] bpf: Introduce BPF support for kernel module function calls Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 02/12] bpf: Be conservative while processing invalid kfunc calls Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 03/12] bpf: btf: Introduce helpers for dynamic BTF set registration Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 04/12] tools: Allow specifying base BTF file in resolve_btfids Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 05/12] bpf: Enable TCP congestion control kfunc from modules Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 06/12] libbpf: Support kernel module function calls Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 07/12] libbpf: Resolve invalid weak kfunc calls with imm = 0, off = 0 Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 08/12] libbpf: Make gen_loader data aligned Kumar Kartikeya Dwivedi
2021-09-29 20:50 ` Alexei Starovoitov [this message]
2021-09-27 14:59 ` [PATCH bpf-next v5 09/12] libbpf: Update gen_loader to emit BTF_KIND_FUNC relocations Kumar Kartikeya Dwivedi
2021-09-29 0:01 ` Alexei Starovoitov
2021-09-29 0:10 ` Kumar Kartikeya Dwivedi
2021-09-27 14:59 ` [PATCH bpf-next v5 10/12] libbpf: Fix skel_internal.h to set errno on loader retval < 0 Kumar Kartikeya Dwivedi
2021-09-30 3:45 ` Alexei Starovoitov
2021-09-27 14:59 ` [PATCH bpf-next v5 11/12] bpf: selftests: Fix fd cleanup in get_branch_snapshot Kumar Kartikeya Dwivedi
2021-09-28 23:58 ` Song Liu
2021-09-29 20:26 ` Alexei Starovoitov
2021-09-27 14:59 ` [PATCH bpf-next v5 12/12] bpf: selftests: Add selftests for module kfunc support Kumar Kartikeya Dwivedi
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