netdev - [PATCH bpf-next 12/14] nfp: bpf: add signed jump insns

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Message-Id: <20180110050742.26226-13-jakub.kicinski@netronome.com>
Date:   Tue,  9 Jan 2018 21:07:40 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     daniel@...earbox.net, alexei.starovoitov@...il.com
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        Nic Viljoen <nick.viljoen@...ronome.com>
Subject: [PATCH bpf-next 12/14] nfp: bpf: add signed jump insns

From: Nic Viljoen <nick.viljoen@...ronome.com>

This patch adds signed jump instructions (jsgt, jsge, jslt, jsle)
to the nfp jit. As well as adding the additional required raw
assembler branch mask to nfp_asm.h

Signed-off-by: Nic Viljoen <nick.viljoen@...ronome.com>
Reviewed-by: Jiong Wang <jiong.wang@...ronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 48 ++++++++++++++++++++++++++++
 drivers/net/ethernet/netronome/nfp/nfp_asm.h |  1 +
 2 files changed, 49 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index b4ed6bca4ea9..47c5224f8d6f 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -1914,6 +1914,26 @@ static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 	return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true);
 }
 
+static int jsgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_imm(nfp_prog, meta, BR_BLT, true);
+}
+
+static int jsge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_imm(nfp_prog, meta, BR_BGE, false);
+}
+
+static int jslt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_imm(nfp_prog, meta, BR_BLT, false);
+}
+
+static int jsle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_imm(nfp_prog, meta, BR_BGE, true);
+}
+
 static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
 	const struct bpf_insn *insn = &meta->insn;
@@ -2003,6 +2023,26 @@ static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 	return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true);
 }
 
+static int jsgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_reg(nfp_prog, meta, BR_BLT, true);
+}
+
+static int jsge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_reg(nfp_prog, meta, BR_BGE, false);
+}
+
+static int jslt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_reg(nfp_prog, meta, BR_BLT, false);
+}
+
+static int jsle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+	return wrp_cmp_reg(nfp_prog, meta, BR_BGE, 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);
@@ -2087,6 +2127,10 @@ static const instr_cb_t instr_cb[256] = {
 	[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_JSGT | BPF_K] =  jsgt_imm,
+	[BPF_JMP | BPF_JSGE | BPF_K] =  jsge_imm,
+	[BPF_JMP | BPF_JSLT | BPF_K] =  jslt_imm,
+	[BPF_JMP | BPF_JSLE | BPF_K] =  jsle_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,
@@ -2094,6 +2138,10 @@ static const instr_cb_t instr_cb[256] = {
 	[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_JSGT | BPF_X] =  jsgt_reg,
+	[BPF_JMP | BPF_JSGE | BPF_X] =  jsge_reg,
+	[BPF_JMP | BPF_JSLT | BPF_X] =  jslt_reg,
+	[BPF_JMP | BPF_JSLE | BPF_X] =  jsle_reg,
 	[BPF_JMP | BPF_JSET | BPF_X] =	jset_reg,
 	[BPF_JMP | BPF_JNE | BPF_X] =	jne_reg,
 	[BPF_JMP | BPF_CALL] =		call,
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_asm.h b/drivers/net/ethernet/netronome/nfp/nfp_asm.h
index a50240ab0ce2..20e51cb60e69 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_asm.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_asm.h
@@ -81,6 +81,7 @@ enum br_mask {
 	BR_BHS = 0x04,
 	BR_BLO = 0x05,
 	BR_BGE = 0x08,
+	BR_BLT = 0x09,
 	BR_UNC = 0x18,
 };
 
-- 
2.15.1