[PATCH net-next v2 7/9] bpf, nfp: implement jiting of BPF_J{LT,LE}

[Daniel Borkmann]

This work implements jiting of BPF_J{LT,LE} instructions with
BPF_X/BPF_K variants for the nfp eBPF JIT. The two BPF_J{SLT,SLE}
instructions have not been added yet given BPF_J{SGT,SGE} are
not supported yet either.

Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
Acked-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c 
b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index 8e57fda..239dfbe 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -1238,6 +1238,16 @@ static int jge_imm(struct nfp_prog *nfp_prog, struct 
nfp_insn_meta *meta)
        return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true);
 }
 
+static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+       return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false);
+}
+
+static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+       return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true);
+}
+
 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
        const struct bpf_insn *insn = &meta->insn;
@@ -1325,6 +1335,16 @@ static int jge_reg(struct nfp_prog *nfp_prog, struct 
nfp_insn_meta *meta)
        return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true);
 }
 
+static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+       return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false);
+}
+
+static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+       return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true);
+}
+
 static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
        return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE);
@@ -1383,11 +1403,15 @@ static int goto_out(struct nfp_prog *nfp_prog, struct 
nfp_insn_meta *meta)
        [BPF_JMP | BPF_JEQ | BPF_K] =   jeq_imm,
        [BPF_JMP | BPF_JGT | BPF_K] =   jgt_imm,
        [BPF_JMP | BPF_JGE | BPF_K] =   jge_imm,
+       [BPF_JMP | BPF_JLT | BPF_K] =   jlt_imm,
+       [BPF_JMP | BPF_JLE | BPF_K] =   jle_imm,
        [BPF_JMP | BPF_JSET | BPF_K] =  jset_imm,
        [BPF_JMP | BPF_JNE | BPF_K] =   jne_imm,
        [BPF_JMP | BPF_JEQ | BPF_X] =   jeq_reg,
        [BPF_JMP | BPF_JGT | BPF_X] =   jgt_reg,
        [BPF_JMP | BPF_JGE | BPF_X] =   jge_reg,
+       [BPF_JMP | BPF_JLT | BPF_X] =   jlt_reg,
+       [BPF_JMP | BPF_JLE | BPF_X] =   jle_reg,
        [BPF_JMP | BPF_JSET | BPF_X] =  jset_reg,
        [BPF_JMP | BPF_JNE | BPF_X] =   jne_reg,
        [BPF_JMP | BPF_EXIT] =          goto_out,
-- 
1.9.3