drivers/net/ethernet/netronome/nfp/bpf/jit.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/netronome/nfp/bpf/jit.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/netronome/nfp/bpf/jit.c
Extension
.c
Size
128063 bytes
Lines
4626
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (gpr_byte >= 4) {
			gpr_byte -= 4;
			gpr++;
		}

		size -= slice_size;
		off += slice_size;
	}

	return 0;
}

static void
wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm)
{
	swreg tmp_reg;

	if (alu_op == ALU_OP_AND) {
		if (!imm)
			wrp_immed(nfp_prog, reg_both(dst), 0);
		if (!imm || !~imm)
			return;
	}
	if (alu_op == ALU_OP_OR) {
		if (!~imm)
			wrp_immed(nfp_prog, reg_both(dst), ~0U);
		if (!imm || !~imm)
			return;
	}
	if (alu_op == ALU_OP_XOR) {
		if (!~imm)
			emit_alu(nfp_prog, reg_both(dst), reg_none(),
				 ALU_OP_NOT, reg_b(dst));
		if (!imm || !~imm)
			return;
	}

	tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog));
	emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg);
}

static int
wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
	      enum alu_op alu_op, bool skip)
{
	const struct bpf_insn *insn = &meta->insn;
	u64 imm = insn->imm; /* sign extend */

	if (skip) {
		meta->flags |= FLAG_INSN_SKIP_NOOP;
		return 0;
	}

	wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U);
	wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32);

	return 0;
}

static int
wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
	      enum alu_op alu_op)
{
	u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;

	emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
	emit_alu(nfp_prog, reg_both(dst + 1),
		 reg_a(dst + 1), alu_op, reg_b(src + 1));

	return 0;
}

static int
wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
	      enum alu_op alu_op)
{
	const struct bpf_insn *insn = &meta->insn;
	u8 dst = insn->dst_reg * 2;

	wrp_alu_imm(nfp_prog, dst, alu_op, insn->imm);
	wrp_zext(nfp_prog, meta, dst);

	return 0;
}

static int
wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
	      enum alu_op alu_op)
{
	u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;

Annotation

Implementation Notes