[PATCH net-next 05/15] nfp: bpf: encode all 64bit shifts

[Jakub Kicinski]

Add encodings of all 64bit shift operations.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Simon Horman <simon.hor...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 48 +++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c 
b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index 7bcff007075c..095cf50e8450 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -825,12 +825,24 @@ static int sub_imm64(struct nfp_prog *nfp_prog, struct 
nfp_insn_meta *meta)
 static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
        const struct bpf_insn *insn = &meta->insn;
-
-       if (insn->imm != 32)
-               return 1; /* TODO */
-
-       wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->dst_reg * 2);
-       wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), 0);
+       u8 dst = insn->dst_reg * 2;
+
+       if (insn->imm < 32) {
+               emit_shf(nfp_prog, reg_both(dst + 1),
+                        reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
+                        SHF_SC_R_DSHF, 32 - insn->imm);
+               emit_shf(nfp_prog, reg_both(dst),
+                        reg_none(), SHF_OP_NONE, reg_b(dst),
+                        SHF_SC_L_SHF, insn->imm);
+       } else if (insn->imm == 32) {
+               wrp_reg_mov(nfp_prog, dst + 1, dst);
+               wrp_immed(nfp_prog, reg_both(dst), 0);
+       } else if (insn->imm > 32) {
+               emit_shf(nfp_prog, reg_both(dst + 1),
+                        reg_none(), SHF_OP_NONE, reg_b(dst),
+                        SHF_SC_L_SHF, insn->imm - 32);
+               wrp_immed(nfp_prog, reg_both(dst), 0);
+       }
 
        return 0;
 }
@@ -838,12 +850,24 @@ static int shl_imm64(struct nfp_prog *nfp_prog, struct 
nfp_insn_meta *meta)
 static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
        const struct bpf_insn *insn = &meta->insn;
-
-       if (insn->imm != 32)
-               return 1; /* TODO */
-
-       wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->dst_reg * 2 + 1);
-       wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
+       u8 dst = insn->dst_reg * 2;
+
+       if (insn->imm < 32) {
+               emit_shf(nfp_prog, reg_both(dst),
+                        reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
+                        SHF_SC_R_DSHF, insn->imm);
+               emit_shf(nfp_prog, reg_both(dst + 1),
+                        reg_none(), SHF_OP_NONE, reg_b(dst + 1),
+                        SHF_SC_R_SHF, insn->imm);
+       } else if (insn->imm == 32) {
+               wrp_reg_mov(nfp_prog, dst, dst + 1);
+               wrp_immed(nfp_prog, reg_both(dst + 1), 0);
+       } else if (insn->imm > 32) {
+               emit_shf(nfp_prog, reg_both(dst),
+                        reg_none(), SHF_OP_NONE, reg_b(dst + 1),
+                        SHF_SC_R_SHF, insn->imm - 32);
+               wrp_immed(nfp_prog, reg_both(dst + 1), 0);
+       }
 
        return 0;
 }
-- 
2.14.1