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Groups > linux.kernel > #1371367 > unrolled thread

[PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests

Started by"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
First post2016-04-05 12:10 +0200
Last post2016-04-06 22:50 +0200
Articles 5 — 4 participants

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  [PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2016-04-05 12:10 +0200
    Re: [PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests Alexei Starovoitov <ast@fb.com> - 2016-04-05 18:30 +0200
      Re: [PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2016-04-05 19:00 +0200
    Re: [PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests Daniel Borkmann <daniel@iogearbox.net> - 2016-04-05 21:50 +0200
    Re: [PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests David Miller <davem@davemloft.net> - 2016-04-06 22:50 +0200

#1371367 — [PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests

From"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Date2016-04-05 12:10 +0200
Subject[PATCH net 4/4] lib/test_bpf: Add additional BPF_ADD tests
Message-ID<rkw5P-1sL-5@gated-at.bofh.it>
Some of these tests proved useful with the powerpc eBPF JIT port due to
sign-extended 16-bit immediate loads. Though some of these aspects get
covered in other tests, it is better to have explicit tests so as to
quickly tag the precise problem.

Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 lib/test_bpf.c | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 2fb31aa..8f22fbe 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -2566,6 +2566,70 @@ static struct bpf_test tests[] = {
 		{ { 0, 0x1 } },
 	},
 	{
+		"ALU_ADD_K: 0 + 0xffff = 0xffff",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0xffff),
+			BPF_ALU32_IMM(BPF_ADD, R2, 0xffff),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU_ADD_K: 0 + 0x7fffffff = 0x7fffffff",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0x7fffffff),
+			BPF_ALU32_IMM(BPF_ADD, R2, 0x7fffffff),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU_ADD_K: 0 + 0x80000000 = 0x80000000",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0x80000000),
+			BPF_ALU32_IMM(BPF_ADD, R2, 0x80000000),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU_ADD_K: 0 + 0x80008000 = 0x80008000",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0x80008000),
+			BPF_ALU32_IMM(BPF_ADD, R2, 0x80008000),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
 		"ALU64_ADD_K: 1 + 2 = 3",
 		.u.insns_int = {
 			BPF_LD_IMM64(R0, 1),
@@ -2657,6 +2721,70 @@ static struct bpf_test tests[] = {
 		{ },
 		{ { 0, 0x1 } },
 	},
+	{
+		"ALU64_ADD_K: 0 + 0xffff = 0xffff",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0xffff),
+			BPF_ALU64_IMM(BPF_ADD, R2, 0xffff),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU64_ADD_K: 0 + 0x7fffffff = 0x7fffffff",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0x7fffffff),
+			BPF_ALU64_IMM(BPF_ADD, R2, 0x7fffffff),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU64_ADD_K: 0 + 0x80000000 = 0xffffffff80000000",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0xffffffff80000000LL),
+			BPF_ALU64_IMM(BPF_ADD, R2, 0x80000000),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU_ADD_K: 0 + 0x80008000 = 0xffffffff80008000",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x0),
+			BPF_LD_IMM64(R3, 0xffffffff80008000LL),
+			BPF_ALU64_IMM(BPF_ADD, R2, 0x80008000),
+			BPF_JMP_REG(BPF_JEQ, R2, R3, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
 	/* BPF_ALU | BPF_SUB | BPF_X */
 	{
 		"ALU_SUB_X: 3 - 1 = 2",
-- 
2.7.4

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#1371772

FromAlexei Starovoitov <ast@fb.com>
Date2016-04-05 18:30 +0200
Message-ID<rkC1C-6PL-57@gated-at.bofh.it>
In reply to#1371367
On 4/5/16 3:02 AM, Naveen N. Rao wrote:
> Some of these tests proved useful with the powerpc eBPF JIT port due to
> sign-extended 16-bit immediate loads. Though some of these aspects get
> covered in other tests, it is better to have explicit tests so as to
> quickly tag the precise problem.
>
> Cc: Alexei Starovoitov <ast@fb.com>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>

Makes sense. Looks like ppc jit will be using quite a bit of
available ppc instructions. Nice.

I'm assuming all these new tests passed with x64 jit?

Acked-by: Alexei Starovoitov <ast@kernel.org>

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#1371784

From"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Date2016-04-05 19:00 +0200
Message-ID<rkCuC-74o-1@gated-at.bofh.it>
In reply to#1371772
On 2016/04/05 09:28AM, Alexei Starovoitov wrote:
> On 4/5/16 3:02 AM, Naveen N. Rao wrote:
> >Some of these tests proved useful with the powerpc eBPF JIT port due to
> >sign-extended 16-bit immediate loads. Though some of these aspects get
> >covered in other tests, it is better to have explicit tests so as to
> >quickly tag the precise problem.
> >
> >Cc: Alexei Starovoitov <ast@fb.com>
> >Cc: Daniel Borkmann <daniel@iogearbox.net>
> >Cc: "David S. Miller" <davem@davemloft.net>
> >Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
> >Cc: Michael Ellerman <mpe@ellerman.id.au>
> >Cc: Paul Mackerras <paulus@samba.org>
> >Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
> 
> Makes sense. Looks like ppc jit will be using quite a bit of
> available ppc instructions. Nice.
> 
> I'm assuming all these new tests passed with x64 jit?

Yes, all these tests pass on x86_64.

- Naveen

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#1371911

FromDaniel Borkmann <daniel@iogearbox.net>
Date2016-04-05 21:50 +0200
Message-ID<rkF98-z8-11@gated-at.bofh.it>
In reply to#1371367
On 04/05/2016 12:02 PM, Naveen N. Rao wrote:
> Some of these tests proved useful with the powerpc eBPF JIT port due to
> sign-extended 16-bit immediate loads. Though some of these aspects get
> covered in other tests, it is better to have explicit tests so as to
> quickly tag the precise problem.
>
> Cc: Alexei Starovoitov <ast@fb.com>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>

Thanks for adding these!

Acked-by: Daniel Borkmann <daniel@iogearbox.net>

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#1372805

FromDavid Miller <davem@davemloft.net>
Date2016-04-06 22:50 +0200
Message-ID<rl2yJ-16I-1@gated-at.bofh.it>
In reply to#1371367
From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Date: Tue,  5 Apr 2016 15:32:56 +0530

> Some of these tests proved useful with the powerpc eBPF JIT port due to
> sign-extended 16-bit immediate loads. Though some of these aspects get
> covered in other tests, it is better to have explicit tests so as to
> quickly tag the precise problem.
> 
> Cc: Alexei Starovoitov <ast@fb.com>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>

Applied.

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