nfp: bpf: encode extended LM pointer operands

Most instructions have special fields which allow switching
between base and extended Local Memory pointers.  Introduce
those to register encoding, we will use the extra LM pointers
to access high addresses of the stack.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 39 insertions, 17 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index 4fa220f710d2..d7dc19feba8d 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -153,6 +153,11 @@ emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op,
 		nfp_prog->error = -EFAULT;
 		return;
 	}
+	if (reg.dst_lmextn || reg.src_lmextn) {
+		pr_err("cmd can't use LMextn\n");
+		nfp_prog->error = -EFAULT;
+		return;
+	}
 
 	__emit_cmd(nfp_prog, op, mode, xfer, reg.areg, reg.breg, size, sync);
 }
@@ -198,7 +203,7 @@ emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer)
 
 static void
 __emit_br_byte(struct nfp_prog *nfp_prog, u8 areg, u8 breg, bool imm8,
-	       u8 byte, bool equal, u16 addr, u8 defer)
+	       u8 byte, bool equal, u16 addr, u8 defer, bool src_lmextn)
 {
 	u16 addr_lo, addr_hi;
 	u64 insn;
@@ -214,32 +219,34 @@ __emit_br_byte(struct nfp_prog *nfp_prog, u8 areg, u8 breg, bool imm8,
 		FIELD_PREP(OP_BB_EQ, equal) |
 		FIELD_PREP(OP_BB_DEFBR, defer) |
 		FIELD_PREP(OP_BB_ADDR_LO, addr_lo) |
-		FIELD_PREP(OP_BB_ADDR_HI, addr_hi);
+		FIELD_PREP(OP_BB_ADDR_HI, addr_hi) |
+		FIELD_PREP(OP_BB_SRC_LMEXTN, src_lmextn);
 
 	nfp_prog_push(nfp_prog, insn);
 }
 
 static void
 emit_br_byte_neq(struct nfp_prog *nfp_prog,
-		 swreg dst, u8 imm, u8 byte, u16 addr, u8 defer)
+		 swreg src, u8 imm, u8 byte, u16 addr, u8 defer)
 {
 	struct nfp_insn_re_regs reg;
 	int err;
 
-	err = swreg_to_restricted(reg_none(), dst, reg_imm(imm), &reg, true);
+	err = swreg_to_restricted(reg_none(), src, reg_imm(imm), &reg, true);
 	if (err) {
 		nfp_prog->error = err;
 		return;
 	}
 
 	__emit_br_byte(nfp_prog, reg.areg, reg.breg, reg.i8, byte, false, addr,
-		       defer);
+		       defer, reg.src_lmextn);
 }
 
 static void
 __emit_immed(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi,
 	     enum immed_width width, bool invert,
-	     enum immed_shift shift, bool wr_both)
+	     enum immed_shift shift, bool wr_both,
+	     bool dst_lmextn, bool src_lmextn)
 {
 	u64 insn;
 
@@ -250,7 +257,9 @@ __emit_immed(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi,
 		FIELD_PREP(OP_IMMED_WIDTH, width) |
 		FIELD_PREP(OP_IMMED_INV, invert) |
 		FIELD_PREP(OP_IMMED_SHIFT, shift) |
-		FIELD_PREP(OP_IMMED_WR_AB, wr_both);
+		FIELD_PREP(OP_IMMED_WR_AB, wr_both) |
+		FIELD_PREP(OP_IMMED_SRC_LMEXTN, src_lmextn) |
+		FIELD_PREP(OP_IMMED_DST_LMEXTN, dst_lmextn);
 
 	nfp_prog_push(nfp_prog, insn);
 }
@@ -274,13 +283,15 @@ emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm,
 	}
 
 	__emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width,
-		     invert, shift, reg.wr_both);
+		     invert, shift, reg.wr_both,
+		     reg.dst_lmextn, reg.src_lmextn);
 }
 
 static void
 __emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
 	   enum shf_sc sc, u8 shift,
-	   u16 areg, enum shf_op op, u16 breg, bool i8, bool sw, bool wr_both)
+	   u16 areg, enum shf_op op, u16 breg, bool i8, bool sw, bool wr_both,
+	   bool dst_lmextn, bool src_lmextn)
 {
 	u64 insn;
 
@@ -302,7 +313,9 @@ __emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
 		FIELD_PREP(OP_SHF_SHIFT, shift) |
 		FIELD_PREP(OP_SHF_OP, op) |
 		FIELD_PREP(OP_SHF_DST_AB, dst_ab) |
-		FIELD_PREP(OP_SHF_WR_AB, wr_both);
+		FIELD_PREP(OP_SHF_WR_AB, wr_both) |
+		FIELD_PREP(OP_SHF_SRC_LMEXTN, src_lmextn) |
+		FIELD_PREP(OP_SHF_DST_LMEXTN, dst_lmextn);
 
 	nfp_prog_push(nfp_prog, insn);
 }
@@ -321,12 +334,14 @@ emit_shf(struct nfp_prog *nfp_prog, swreg dst,
 	}
 
 	__emit_shf(nfp_prog, reg.dst, reg.dst_ab, sc, shift,
-		   reg.areg, op, reg.breg, reg.i8, reg.swap, reg.wr_both);
+		   reg.areg, op, reg.breg, reg.i8, reg.swap, reg.wr_both,
+		   reg.dst_lmextn, reg.src_lmextn);
 }
 
 static void
 __emit_alu(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
-	   u16 areg, enum alu_op op, u16 breg, bool swap, bool wr_both)
+	   u16 areg, enum alu_op op, u16 breg, bool swap, bool wr_both,
+	   bool dst_lmextn, bool src_lmextn)
 {
 	u64 insn;
 
@@ -337,7 +352,9 @@ __emit_alu(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
 		FIELD_PREP(OP_ALU_SW, swap) |
 		FIELD_PREP(OP_ALU_OP, op) |
 		FIELD_PREP(OP_ALU_DST_AB, dst_ab) |
-		FIELD_PREP(OP_ALU_WR_AB, wr_both);
+		FIELD_PREP(OP_ALU_WR_AB, wr_both) |
+		FIELD_PREP(OP_ALU_SRC_LMEXTN, src_lmextn) |
+		FIELD_PREP(OP_ALU_DST_LMEXTN, dst_lmextn);
 
 	nfp_prog_push(nfp_prog, insn);
 }
@@ -356,13 +373,15 @@ emit_alu(struct nfp_prog *nfp_prog, swreg dst,
 	}
 
 	__emit_alu(nfp_prog, reg.dst, reg.dst_ab,
-		   reg.areg, op, reg.breg, reg.swap, reg.wr_both);
+		   reg.areg, op, reg.breg, reg.swap, reg.wr_both,
+		   reg.dst_lmextn, reg.src_lmextn);
 }
 
 static void
 __emit_ld_field(struct nfp_prog *nfp_prog, enum shf_sc sc,
 		u8 areg, u8 bmask, u8 breg, u8 shift, bool imm8,
-		bool zero, bool swap, bool wr_both)
+		bool zero, bool swap, bool wr_both,
+		bool dst_lmextn, bool src_lmextn)
 {
 	u64 insn;
 
@@ -375,7 +394,9 @@ __emit_ld_field(struct nfp_prog *nfp_prog, enum shf_sc sc,
 		FIELD_PREP(OP_LDF_ZF, zero) |
 		FIELD_PREP(OP_LDF_BMASK, bmask) |
 		FIELD_PREP(OP_LDF_SHF, shift) |
-		FIELD_PREP(OP_LDF_WR_AB, wr_both);
+		FIELD_PREP(OP_LDF_WR_AB, wr_both) |
+		FIELD_PREP(OP_LDF_SRC_LMEXTN, src_lmextn) |
+		FIELD_PREP(OP_LDF_DST_LMEXTN, dst_lmextn);
 
 	nfp_prog_push(nfp_prog, insn);
 }
@@ -394,7 +415,8 @@ emit_ld_field_any(struct nfp_prog *nfp_prog, enum shf_sc sc, u8 shift,
 	}
 
 	__emit_ld_field(nfp_prog, sc, reg.areg, bmask, reg.breg, shift,
-			reg.i8, zero, reg.swap, reg.wr_both);
+			reg.i8, zero, reg.swap, reg.wr_both,
+			reg.dst_lmextn, reg.src_lmextn);
 }
 
 static void