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riscv, bpf: Support unconditional bswap insn 

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@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20230824095001.3408573-7-pulehui@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Pu Lehui 2023-08-24 09:50:00 +00:00 committed by Alexei Starovoitov
parent 3e18ff4bce
commit 83cc63afab
1 changed files with 1 additions and 0 deletions
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1
arch/riscv/net/bpf_jit_comp64.c
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@ -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);