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powerpc/bpf/64: add support for BPF_ATOMIC bitwise operations 

Adding instructions for ppc64 for

atomic[64]_and
atomic[64]_or
atomic[64]_xor

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> (ppc64le)
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610155552.25892-2-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini 2022-06-10 21:25:48 +05:30 committed by Michael Ellerman
parent 61bdbca855
commit 6511270911
1 changed files with 29 additions and 28 deletions
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57
arch/powerpc/net/bpf_jit_comp64.c
View File

@ -777,41 +777,42 @@ emit_clear:
* BPF_STX ATOMIC (atomic ops)
*/
case BPF_STX | BPF_ATOMIC | BPF_W:
if (imm != BPF_ADD) {
pr_err_ratelimited(
"eBPF filter atomic op code %02x (@%d) unsupported\n",
code, i);
return -ENOTSUPP;
}
/* *(u32 *)(dst + off) += src */
/* Get EA into TMP_REG_1 */
EMIT(PPC_RAW_ADDI(tmp1_reg, dst_reg, off));
case BPF_STX | BPF_ATOMIC | BPF_DW:
/* Get offset into TMP_REG_1 */
EMIT(PPC_RAW_LI(tmp1_reg, off));
tmp_idx = ctx->idx * 4;
/* load value from memory into TMP_REG_2 */
EMIT(PPC_RAW_LWARX(tmp2_reg, 0, tmp1_reg, 0));
/* add value from src_reg into this */
EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
/* store result back */
EMIT(PPC_RAW_STWCX(tmp2_reg, 0, tmp1_reg));
/* we're done if this succeeded */
PPC_BCC_SHORT(COND_NE, tmp_idx);
break;
case BPF_STX | BPF_ATOMIC | BPF_DW:
if (imm != BPF_ADD) {
if (size == BPF_DW)
EMIT(PPC_RAW_LDARX(tmp2_reg, tmp1_reg, dst_reg, 0));
else
EMIT(PPC_RAW_LWARX(tmp2_reg, tmp1_reg, dst_reg, 0));
switch (imm) {
case BPF_ADD:
EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_AND:
EMIT(PPC_RAW_AND(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_OR:
EMIT(PPC_RAW_OR(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_XOR:
EMIT(PPC_RAW_XOR(tmp2_reg, tmp2_reg, src_reg));
break;
default:
pr_err_ratelimited(
"eBPF filter atomic op code %02x (@%d) unsupported\n",
code, i);
return -ENOTSUPP;
return -EOPNOTSUPP;
}
/* *(u64 *)(dst + off) += src */
EMIT(PPC_RAW_ADDI(tmp1_reg, dst_reg, off));
tmp_idx = ctx->idx * 4;
EMIT(PPC_RAW_LDARX(tmp2_reg, 0, tmp1_reg, 0));
EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
EMIT(PPC_RAW_STDCX(tmp2_reg, 0, tmp1_reg));
/* store result back */
if (size == BPF_DW)
EMIT(PPC_RAW_STDCX(tmp2_reg, tmp1_reg, dst_reg));
else
EMIT(PPC_RAW_STWCX(tmp2_reg, tmp1_reg, dst_reg));
/* we're done if this succeeded */
PPC_BCC_SHORT(COND_NE, tmp_idx);
break;