Commit dbe6e245 authored by Hari Bathini's avatar Hari Bathini Committed by Michael Ellerman
Browse files

powerpc/bpf/64: add support for atomic fetch operations 



Adding instructions for ppc64 for

atomic[64]_fetch_add
atomic[64]_fetch_and
atomic[64]_fetch_or
atomic[64]_fetch_xor

Signed-off-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> (ppc64le)
Reviewed-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610155552.25892-3-hbathini@linux.ibm.com
parent 65112709

arch/powerpc/net/bpf_jit_comp64.c

+13 −1
Original line number Diff line number Diff line
@@ -787,17 +787,25 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * 
			else

				EMIT(PPC_RAW_LWARX(tmp2_reg, tmp1_reg, dst_reg, 0));



			/* Save old value in _R0 */

			if (imm & BPF_FETCH)

				EMIT(PPC_RAW_MR(_R0, tmp2_reg));



			switch (imm) {

			case BPF_ADD:

			case BPF_ADD | BPF_FETCH:

				EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));

				break;

			case BPF_AND:

			case BPF_AND | BPF_FETCH:

				EMIT(PPC_RAW_AND(tmp2_reg, tmp2_reg, src_reg));

				break;

			case BPF_OR:

			case BPF_OR | BPF_FETCH:

				EMIT(PPC_RAW_OR(tmp2_reg, tmp2_reg, src_reg));

				break;

			case BPF_XOR:

			case BPF_XOR | BPF_FETCH:

				EMIT(PPC_RAW_XOR(tmp2_reg, tmp2_reg, src_reg));

				break;

			default:
@@ -807,13 +815,17 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * 
				return -EOPNOTSUPP;

			}



			/* store result back */

			/* store new value */

			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);



			/* For the BPF_FETCH variant, get old value into src_reg */

			if (imm & BPF_FETCH)

				EMIT(PPC_RAW_MR(src_reg, _R0));

			break;



		/*