[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <ZPrcpZyHWsF+g8DR@shell.armlinux.org.uk>
Date: Fri, 8 Sep 2023 09:34:45 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Puranjay Mohan <puranjay12@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
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>,
Shubham Bansal <illusionist.neo@...il.com>,
Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 4/9] arm32, bpf: add support for
unconditional bswap instruction
On Thu, Sep 07, 2023 at 11:05:45PM +0000, Puranjay Mohan wrote:
> The cpuv4 added a new unconditional bswap instruction with following
> behaviour:
>
> BPF_ALU64 | BPF_TO_LE | BPF_END with imm = 16/32/64 means:
> dst = bswap16(dst)
> dst = bswap32(dst)
> dst = bswap64(dst)
>
> As we already support converting to big-endian from little-endian we can
> use the same for unconditional bswap. just treat the unconditional scenario
> the same as big-endian conversion.
>
> Signed-off-by: Puranjay Mohan <puranjay12@...il.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Thanks!
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
Powered by blists - more mailing lists