netdev - Re: [PATCH bpf-next 0/2] Add 12-argument support for RV64 bpf trampoline

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Date: Tue, 02 Apr 2024 15:41:54 +0200
From: Björn Töpel <bjorn@...nel.org>
To: Pu Lehui <pulehui@...weicloud.com>, bpf@...r.kernel.org,
 linux-riscv@...ts.infradead.org, netdev@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai
 Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
 <song@...nel.org>, Yonghong Song <yhs@...com>, John Fastabend
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Pu Lehui
 <pulehui@...wei.com>, Pu Lehui <pulehui@...weicloud.com>
Subject: Re: [PATCH bpf-next 0/2] Add 12-argument support for RV64 bpf
 trampoline

Pu Lehui <pulehui@...weicloud.com> writes:

> This patch adds 12 function arguments support for riscv64 bpf
> trampoline. The current bpf trampoline supports <= sizeof(u64) bytes
> scalar arguments [0] and <= 16 bytes struct arguments [1]. Therefore, we
> focus on the situation where scalars are at most XLEN bits and
> aggregates whose total size does not exceed 2×XLEN bits in the riscv
> calling convention [2].
>
> Link: https://elixir.bootlin.com/linux/v6.8/source/kernel/bpf/btf.c#L6184 [0]
> Link: https://elixir.bootlin.com/linux/v6.8/source/kernel/bpf/btf.c#L6769 [1]
> Link: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/download/draft-20230929-e5c800e661a53efe3c2678d71a306323b60eb13b/riscv-abi.pdf [2]
>
> Pu Lehui (2):
>   riscv, bpf: Add 12-argument support for RV64 bpf trampoline
>   selftests/bpf: Add testcase where 7th argment is struct

Thank you!

For the series:

Acked-by: Björn Töpel <bjorn@...nel.org>
Reviewed-by: Björn Töpel <bjorn@...osinc.com>