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bpf/arm: add byte swap operations

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add le16, le32, le64, be16, be32 and be64 operations.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
This commit is contained in:
Jerin Jacob 2019-09-03 16:29:35 +05:30 committed by Thomas Monjalon
parent 9f4469d9e8
commit 2b6d22fa9a
1 changed files with 87 additions and 0 deletions
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87
lib/librte_bpf/bpf_jit_arm64.c
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@ -6,6 +6,7 @@
#include <stdbool.h>
#include <rte_common.h>
#include <rte_byteorder.h>
#include "bpf_impl.h"
@ -474,6 +475,84 @@ emit_mod(struct a64_jit_ctx *ctx, bool is64, uint8_t tmp, uint8_t rd,
emit_msub(ctx, is64, rd, tmp, rm, rd);
}
static void
emit_zero_extend(struct a64_jit_ctx *ctx, uint8_t rd, int32_t imm)
{
switch (imm) {
case 16:
/* Zero-extend 16 bits into 64 bits */
emit_bitfield(ctx, 1, rd, rd, 0, 15, A64_UBFM);
break;
case 32:
/* Zero-extend 32 bits into 64 bits */
emit_bitfield(ctx, 1, rd, rd, 0, 31, A64_UBFM);
break;
case 64:
break;
default:
/* Generate error */
emit_insn(ctx, 0, 1);
}
}
static void
emit_rev(struct a64_jit_ctx *ctx, uint8_t rd, int32_t imm)
{
uint32_t insn;
insn = 0xdac00000;
insn |= rd << 5;
insn |= rd;
switch (imm) {
case 16:
insn |= 1 << 10;
emit_insn(ctx, insn, check_reg(rd));
emit_zero_extend(ctx, rd, 16);
break;
case 32:
insn |= 2 << 10;
emit_insn(ctx, insn, check_reg(rd));
/* Upper 32 bits already cleared */
break;
case 64:
insn |= 3 << 10;
emit_insn(ctx, insn, check_reg(rd));
break;
default:
/* Generate error */
emit_insn(ctx, insn, 1);
}
}
static int
is_be(void)
{
#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
return 1;
#else
return 0;
#endif
}
static void
emit_be(struct a64_jit_ctx *ctx, uint8_t rd, int32_t imm)
{
if (is_be())
emit_zero_extend(ctx, rd, imm);
else
emit_rev(ctx, rd, imm);
}
static void
emit_le(struct a64_jit_ctx *ctx, uint8_t rd, int32_t imm)
{
if (is_be())
emit_rev(ctx, rd, imm);
else
emit_zero_extend(ctx, rd, imm);
}
static uint8_t
ebpf_to_a64_reg(struct a64_jit_ctx *ctx, uint8_t reg)
{
@ -896,6 +975,14 @@ emit(struct a64_jit_ctx *ctx, struct rte_bpf *bpf)
case EBPF_ALU64 | EBPF_ARSH | BPF_K:
emit_asr(ctx, is64, dst, imm);
break;
/* dst = be##imm(dst) */
case (BPF_ALU | EBPF_END | EBPF_TO_BE):
emit_be(ctx, dst, imm);
break;
/* dst = le##imm(dst) */
case (BPF_ALU | EBPF_END | EBPF_TO_LE):
emit_le(ctx, dst, imm);
break;
/* Return r0 */
case (BPF_JMP | EBPF_EXIT):
emit_epilogue(ctx);