linux-kernel - [PATCH bpf-next v2 6/7] riscv, bpf: Support unconditional bswap insn

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Date:   Thu, 24 Aug 2023 09:50:00 +0000
From:   Pu Lehui <pulehui@...weicloud.com>
To:     linux-riscv@...ts.infradead.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Björn Töpel <bjorn@...nel.org>,
        Yonghong Song <yhs@...com>,
        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>,
        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>,
        Xu Kuohai <xukuohai@...wei.com>,
        Puranjay Mohan <puranjay12@...il.com>,
        Pu Lehui <pulehui@...wei.com>,
        Pu Lehui <pulehui@...weicloud.com>
Subject: [PATCH bpf-next v2 6/7] riscv, bpf: Support unconditional bswap insn

From: Pu Lehui <pulehui@...wei.com>

Add support unconditional bswap instruction. Since riscv is always
little-endian, just treat the unconditional scenario the same as
big-endian conversion.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
Acked-by: Björn Töpel <bjorn@...nel.org>
---
 arch/riscv/net/bpf_jit_comp64.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index ba4535ac194f..8423f4ddf8f5 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -1168,6 +1168,7 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 		break;
 
 	case BPF_ALU | BPF_END | BPF_FROM_BE:
+	case BPF_ALU64 | BPF_END | BPF_FROM_LE:
 		emit_li(RV_REG_T2, 0, ctx);
 
 		emit_andi(RV_REG_T1, rd, 0xff, ctx);
-- 
2.39.2