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s390/bpf: Implement unconditional byte swap

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Implement the cpuv4 unconditional byte swap, which is encoded as
BPF_ALU64 | BPF_END | BPF_FROM_LE. Since s390x is big-endian, it's
the same as the existing BPF_ALU | BPF_END | BPF_FROM_LE.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230919101336.2223655-7-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ilya Leoshkevich 2023-09-19 12:09:08 +02:00 • committed by Alexei Starovoitov
parent 738476a079
commit 90f426d35e
1 changed files with 1 additions and 0 deletions
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arch/s390/net/bpf_jit_comp.c
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@ -1253,6 +1253,7 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
}
break;
case BPF_ALU | BPF_END | BPF_FROM_LE:
case BPF_ALU64 | BPF_END | BPF_FROM_LE:
switch (imm) {
case 16: /* dst = (u16) cpu_to_le16(dst) */
/* lrvr %dst,%dst */