[dpdk-dev] [PATCH v3 1/2] net/tap: add eBPF instructions to TAP device

Ophir Munk ophirmu at mellanox.com
Wed Jan 10 08:06:08 CET 2018


TAP PMD is required to support RSS queue mapping based on rte_flow API. An
example usage for this requirement is failsafe transparent switching from a
PCI device to TAP device while keep redirecting packets to the same RSS
queues on both devices.

TAP RSS implementation is based on eBPF programs sent to Linux kernel
through BPF system calls and using netlink messages to reference the
programs as part of traffic control commands.

An eBPF program acts as a traffic control classifier or action. Each
program is written in C code under a different ELF section name. Clang 3.7
is used to compile the C code into eBPF-formatted object file. The ELF file
is parsed and its sections (programs) can be downloaded to the kernel using
BPF system call. The BPF system call parameters contain the array of eBPF
instructions. This commit includes BPF classifier and action programs
(tap_bpf_program.c) as reference and their corresponding arrays of eBPF
instructions (tap_bpf_insns.c). The reference file does not take part in
dpdk compilation. The details on how to generate new eBPF code will be
presented in another commit.

In a follow up commit TAP PMD will use the eBPF programs to implement RSS
flow rules.

TAP eBPF requires Linux version 4.9 configured with BPF. TAP PMD will
successfully compile on systems with old or non-BPF configured kernels but
RSS rules creation on TAP devices will not be supported.

Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
---
 drivers/net/tap/Makefile          |   11 +
 drivers/net/tap/tap_bpf.h         |   96 ++
 drivers/net/tap/tap_bpf_insns.c   | 1845 +++++++++++++++++++++++++++++++++++++
 drivers/net/tap/tap_bpf_program.c |  221 +++++
 drivers/net/tap/tap_flow.h        |    5 +
 5 files changed, 2178 insertions(+)
 create mode 100644 drivers/net/tap/tap_bpf.h
 create mode 100644 drivers/net/tap/tap_bpf_insns.c
 create mode 100644 drivers/net/tap/tap_bpf_program.c

diff --git a/drivers/net/tap/Makefile b/drivers/net/tap/Makefile
index fd4195f..feaa5b7 100644
--- a/drivers/net/tap/Makefile
+++ b/drivers/net/tap/Makefile
@@ -12,6 +12,9 @@ EXPORT_MAP := rte_pmd_tap_version.map
 
 LIBABIVER := 1
 
+# TAP_MAX_QUEUES must be a power of 2 as it will be used for masking */
+TAP_MAX_QUEUES = 16
+
 CFLAGS += -O3
 CFLAGS += -I$(SRCDIR)
 CFLAGS += -I.
@@ -20,6 +23,8 @@ LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
 LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs -lrte_hash
 LDLIBS += -lrte_bus_vdev
 
+CFLAGS += -DTAP_MAX_QUEUES=$(TAP_MAX_QUEUES)
+
 #
 # all source are stored in SRCS-y
 #
@@ -27,6 +32,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PMD_TAP) += rte_eth_tap.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_TAP) += tap_flow.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_TAP) += tap_netlink.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_TAP) += tap_tcmsgs.c
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_TAP) += tap_bpf_insns.c
 
 include $(RTE_SDK)/mk/rte.lib.mk
 
@@ -53,6 +59,11 @@ tap_autoconf.h.new: $(RTE_SDK)/buildtools/auto-config-h.sh
 		linux/pkt_cls.h \
 		enum TCA_FLOWER_KEY_VLAN_PRIO \
 		$(AUTOCONF_OUTPUT)
+	$Q sh -- '$<' '$@' \
+		HAVE_BPF_PROG_LOAD \
+		linux/bpf.h \
+		enum BPF_PROG_LOAD \
+		$(AUTOCONF_OUTPUT)
 
 # Create tap_autoconf.h or update it in case it differs from the new one.
 
diff --git a/drivers/net/tap/tap_bpf.h b/drivers/net/tap/tap_bpf.h
new file mode 100644
index 0000000..82775b7
--- /dev/null
+++ b/drivers/net/tap/tap_bpf.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2017 Mellanox Technologies, Ltd.
+ */
+
+#ifndef __TAP_BPF_H__
+#define __TAP_BPF_H__
+
+#include <tap_autoconf.h>
+
+#ifdef HAVE_BPF_PROG_LOAD
+#include <linux/bpf.h>
+#else
+/* BPF_MAP_UPDATE_ELEM command flags */
+#define	BPF_ANY	0 /* create a new element or update an existing */
+
+/* BPF architecture instruction struct */
+struct bpf_insn {
+	__u8	code;
+	__u8	dst_reg:4;
+	__u8	src_reg:4;
+	__s16	off;
+	__s32	imm; /* immediate value */
+};
+
+/* BPF program types */
+enum bpf_prog_type {
+	BPF_PROG_TYPE_UNSPEC,
+	BPF_PROG_TYPE_SOCKET_FILTER,
+	BPF_PROG_TYPE_KPROBE,
+	BPF_PROG_TYPE_SCHED_CLS,
+	BPF_PROG_TYPE_SCHED_ACT,
+};
+
+/* BPF commands types */
+enum bpf_cmd {
+	BPF_MAP_CREATE,
+	BPF_MAP_LOOKUP_ELEM,
+	BPF_MAP_UPDATE_ELEM,
+	BPF_MAP_DELETE_ELEM,
+	BPF_MAP_GET_NEXT_KEY,
+	BPF_PROG_LOAD,
+};
+
+/* BPF maps types */
+enum bpf_map_type {
+	BPF_MAP_TYPE_UNSPEC,
+	BPF_MAP_TYPE_HASH,
+};
+
+/* union of anonymous structs used with TAP BPF commands */
+union bpf_attr {
+	/* BPF_MAP_CREATE command */
+	struct {
+		__u32	map_type;
+		__u32	key_size;
+		__u32	value_size;
+		__u32	max_entries;
+		__u32	map_flags;
+		__u32	inner_map_fd;
+	};
+
+	/* BPF_MAP_UPDATE_ELEM, BPF_MAP_DELETE_ELEM commands */
+	struct {
+		__u32		map_fd;
+		__aligned_u64	key;
+		union {
+			__aligned_u64 value;
+			__aligned_u64 next_key;
+		};
+		__u64		flags;
+	};
+
+	/* BPF_PROG_LOAD command */
+	struct {
+		__u32		prog_type;
+		__u32		insn_cnt;
+		__aligned_u64	insns;
+		__aligned_u64	license;
+		__u32		log_level;
+		__u32		log_size;
+		__aligned_u64	log_buf;
+		__u32		kern_version;
+		__u32		prog_flags;
+	};
+} __attribute__((aligned(8)));
+#endif
+
+enum {
+	BPF_MAP_ID_KEY,
+	BPF_MAP_ID_SIMPLE,
+};
+
+static int bpf_load(enum bpf_prog_type type, const struct bpf_insn *insns,
+		size_t insns_cnt, const char *license);
+
+#endif /* __TAP_BPF_H__ */
diff --git a/drivers/net/tap/tap_bpf_insns.c b/drivers/net/tap/tap_bpf_insns.c
new file mode 100644
index 0000000..25aa82c
--- /dev/null
+++ b/drivers/net/tap/tap_bpf_insns.c
@@ -0,0 +1,1845 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2017 Mellanox Technologies, Ltd.
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/queue.h>
+#include <sys/mount.h>
+
+#include <rte_byteorder.h>
+#include <rte_jhash.h>
+#include <rte_malloc.h>
+#include <rte_eth_tap.h>
+#include <tap_flow.h>
+#include <tap_autoconf.h>
+#include <tap_tcmsgs.h>
+#include <tap_bpf.h>
+
+#define ERROR                   0
+
+/*
+ * The queue number is offset by 1, to distinguish packets that have
+ * gone through this rule (skb->cb[1] != 0) from others.
+ */
+#define QUEUE_OFFSET 1
+
+/* bpf_insn array matching cls_q section. See tap_bpf_program.c file */
+static struct bpf_insn cls_q_insns[] = {
+	{0x61,    1,    1,       52, 0x00000000},
+	{0x18,    2,    0,        0, 0xdeadbeef},
+	{0x00,    0,    0,        0, 0x00000000},
+	{0x63,   10,    2,       -4, 0x00000000},
+	{0x61,    2,   10,       -4, 0x00000000},
+	{0x07,    2,    0,        0, 0x00000001},
+	{0x67,    2,    0,        0, 0x00000020},
+	{0x77,    2,    0,        0, 0x00000020},
+	{0xb7,    0,    0,        0, 0xffffffff},
+	{0x1d,    1,    2,        1, 0x00000000},
+	{0xb7,    0,    0,        0, 0x00000000},
+	{0x95,    0,    0,        0, 0x00000000},
+};
+
+/**
+ * Load BPF program (section cls_q) into the kernel and return a bpf fd
+ *
+ * @param queue_idx
+ *   Queue index matching packet cb
+ *
+ * @return
+ *   -1 if the BPF program couldn't be loaded. An fd (int) otherwise.
+ */
+int tap_flow_bpf_cls_q(__u32 queue_idx)
+{
+	cls_q_insns[1].imm = queue_idx;
+
+	return bpf_load(BPF_PROG_TYPE_SCHED_CLS,
+		(struct bpf_insn *)cls_q_insns,
+		ARRAY_SIZE(cls_q_insns),
+		"Dual BSD/GPL");
+}
+
+/* bpf_insn array matching l3_l4 section. see tap_bpf_program.c file */
+static struct bpf_insn l3_l4_hash_insns[] = {
+	{0xbf,    7,    1,        0, 0x00000000},
+	{0x61,    8,    7,       16, 0x00000000},
+	{0x61,    6,    7,       76, 0x00000000},
+	{0x61,    9,    7,       80, 0x00000000},
+	{0x18,    1,    0,        0, 0xdeadbeef},
+	{0x00,    0,    0,        0, 0x00000000},
+	{0x63,   10,    1,       -4, 0x00000000},
+	{0xbf,    2,   10,        0, 0x00000000},
+	{0x07,    2,    0,        0, 0xfffffffc},
+	{0x18,    1,    1,        0, 0x0000cafe},
+	{0x00,    0,    0,        0, 0x00000000},
+	{0x85,    0,    0,        0, 0x00000001},
+	{0x55,    0,    0,       21, 0x00000000},
+	{0xb7,    1,    0,        0, 0x00000a64},
+	{0x6b,   10,    1,      -16, 0x00000000},
+	{0x18,    1,    0,        0, 0x69666e6f},
+	{0x00,    0,    0,        0, 0x65727567},
+	{0x7b,   10,    1,      -24, 0x00000000},
+	{0x18,    1,    0,        0, 0x6e207369},
+	{0x00,    0,    0,        0, 0x6320746f},
+	{0x7b,   10,    1,      -32, 0x00000000},
+	{0x18,    1,    0,        0, 0x20737372},
+	{0x00,    0,    0,        0, 0x2079656b},
+	{0x7b,   10,    1,      -40, 0x00000000},
+	{0x18,    1,    0,        0, 0x68736168},
+	{0x00,    0,    0,        0, 0x203a2928},
+	{0x7b,   10,    1,      -48, 0x00000000},
+	{0xb7,    7,    0,        0, 0x00000000},
+	{0x73,   10,    7,      -14, 0x00000000},
+	{0xbf,    1,   10,        0, 0x00000000},
+	{0x07,    1,    0,        0, 0xffffffd0},
+	{0xb7,    2,    0,        0, 0x00000023},
+	{0x85,    0,    0,        0, 0x00000006},
+	{0x05,    0,    0,     1632, 0x00000000},
+	{0xb7,    1,    0,        0, 0x0000000e},
+	{0x61,    2,    7,       20, 0x00000000},
+	{0x15,    2,    0,       10, 0x00000000},
+	{0x61,    2,    7,       28, 0x00000000},
+	{0x55,    2,    0,        8, 0x0000a888},
+	{0xbf,    2,    7,        0, 0x00000000},
+	{0xb7,    7,    0,        0, 0x00000000},
+	{0xbf,    1,    6,        0, 0x00000000},
+	{0x07,    1,    0,        0, 0x00000012},
+	{0x2d,    1,    9,     1622, 0x00000000},
+	{0xb7,    1,    0,        0, 0x00000012},
+	{0x69,    8,    6,       16, 0x00000000},
+	{0xbf,    7,    2,        0, 0x00000000},
+	{0x7b,   10,    7,      -56, 0x00000000},
+	{0x57,    8,    0,        0, 0x0000ffff},
+	{0x15,    8,    0,      409, 0x0000dd86},
+	{0xb7,    7,    0,        0, 0x00000003},
+	{0x55,    8,    0,     1614, 0x00000008},
+	{0x0f,    6,    1,        0, 0x00000000},
+	{0xb7,    7,    0,        0, 0x00000000},
+	{0xbf,    1,    6,        0, 0x00000000},
+	{0x07,    1,    0,        0, 0x00000018},
+	{0x2d,    1,    9,     1609, 0x00000000},
+	{0x71,    3,    6,       12, 0x00000000},
+	{0xbf,    1,    3,        0, 0x00000000},
+	{0x67,    1,    0,        0, 0x00000038},
+	{0xc7,    1,    0,        0, 0x00000020},
+	{0x77,    1,    0,        0, 0x0000001f},
+	{0x57,    1,    0,        0, 0x2cc681d1},
+	{0x67,    3,    0,        0, 0x00000018},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x40000000},
+	{0xb7,    2,    0,        0, 0x00000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x598d03a2},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x20000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xb31a0745},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x10000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x66340e8a},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x08000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xcc681d15},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x04000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x98d03a2b},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x02000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x31a07456},
+	{0x57,    3,    0,        0, 0x01000000},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x6340e8ad},
+	{0x71,    3,    6,       13, 0x00000000},
+	{0x67,    3,    0,        0, 0x00000010},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00800000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xc681d15b},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00400000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8d03a2b7},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00200000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x1a07456f},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00100000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x340e8ade},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00080000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x681d15bd},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00040000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xd03a2b7b},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00020000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xa07456f6},
+	{0x57,    3,    0,        0, 0x00010000},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x40e8aded},
+	{0x71,    3,    6,       14, 0x00000000},
+	{0x67,    3,    0,        0, 0x00000008},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00008000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x81d15bdb},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00004000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x03a2b7b7},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00002000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x07456f6f},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00001000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x0e8adedf},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000800},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x1d15bdbf},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000400},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x3a2b7b7e},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000200},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7456f6fd},
+	{0x57,    3,    0,        0, 0x00000100},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xe8adedfa},
+	{0x71,    3,    6,       15, 0x00000000},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000080},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xd15bdbf4},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000040},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xa2b7b7e9},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000020},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x456f6fd3},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000010},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8adedfa7},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000008},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x15bdbf4f},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000004},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x2b7b7e9e},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000002},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x56f6fd3d},
+	{0x57,    3,    0,        0, 0x00000001},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xadedfa7b},
+	{0x71,    4,    6,       16, 0x00000000},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x67,    5,    0,        0, 0x00000038},
+	{0xc7,    5,    0,        0, 0x00000020},
+	{0xb7,    3,    0,        0, 0xffffffff},
+	{0x6d,    5,    3,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x5bdbf4f7},
+	{0x67,    4,    0,        0, 0x00000018},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x40000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xb7b7e9ef},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x20000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x6f6fd3df},
+	{0xbf,    5,    4,        0, 0x00000000},
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+	{0xa7,    1,    0,        0, 0x3a2b7b7e},
+	{0xbf,    3,    4,        0, 0x00000000},
+	{0x57,    3,    0,        0, 0x00020000},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7456f6fd},
+	{0xbf,    3,    4,        0, 0x00000000},
+	{0x57,    3,    0,        0, 0x00010000},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xe8adedfa},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x67,    5,    0,        0, 0x00000020},
+	{0xc7,    5,    0,        0, 0x00000020},
+	{0xb7,    3,    0,        0, 0xffffffff},
+	{0x6d,    5,    3,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xd15bdbf4},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x40000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xa2b7b7e9},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x20000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x456f6fd3},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x10000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8adedfa7},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x08000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x15bdbf4f},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x04000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x2b7b7e9e},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x02000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x56f6fd3d},
+	{0x57,    4,    0,        0, 0x01000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xadedfa7b},
+	{0x61,    4,    6,       12, 0x00000000},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000080},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x5bdbf4f7},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000040},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xb7b7e9ef},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000020},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x6f6fd3df},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000010},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xdedfa7bf},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000008},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xbdbf4f7f},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000004},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7b7e9eff},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000002},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf6fd3dff},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000001},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xedfa7bfe},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00008000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xdbf4f7fc},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00004000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xb7e9eff9},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00002000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x6fd3dff2},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00001000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xdfa7bfe5},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000800},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xbf4f7fca},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000400},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7e9eff94},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000200},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xfd3dff28},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000100},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xfa7bfe51},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00800000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf4f7fca2},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00400000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xe9eff945},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00200000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xd3dff28a},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00100000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xa7bfe514},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00080000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x4f7fca28},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00040000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x9eff9450},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00020000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x3dff28a0},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00010000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7bfe5141},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x67,    5,    0,        0, 0x00000020},
+	{0xc7,    5,    0,        0, 0x00000020},
+	{0x6d,    5,    3,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf7fca283},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x40000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xeff94506},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x20000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xdff28a0c},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x10000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xbfe51418},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x08000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7fca2831},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x04000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xff945063},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x02000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xff28a0c6},
+	{0x57,    4,    0,        0, 0x01000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xfe51418c},
+	{0x61,    4,    6,       16, 0x00000000},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000080},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xfca28319},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000040},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf9450633},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000020},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf28a0c67},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000010},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xe51418ce},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000008},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xca28319d},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000004},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x9450633b},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000002},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x28a0c676},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000001},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x51418ced},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00008000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xa28319db},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00004000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x450633b6},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00002000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8a0c676c},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00001000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x1418ced8},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000800},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x28319db1},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000400},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x50633b63},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000200},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xa0c676c6},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000100},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x418ced8d},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00800000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8319db1a},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00400000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x0633b634},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00200000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x0c676c68},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00100000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x18ced8d1},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00080000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x319db1a3},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00040000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x633b6347},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00020000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xc676c68f},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00010000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8ced8d1f},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x67,    5,    0,        0, 0x00000020},
+	{0xc7,    5,    0,        0, 0x00000020},
+	{0x6d,    5,    3,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x19db1a3e},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x40000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x33b6347d},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x20000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x676c68fa},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x10000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xced8d1f4},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x08000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x9db1a3e9},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x04000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x3b6347d2},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x02000000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x76c68fa5},
+	{0x57,    4,    0,        0, 0x01000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xed8d1f4a},
+	{0x61,    4,    6,       20, 0x00000000},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000080},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xdb1a3e94},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000040},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xb6347d28},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000020},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x6c68fa51},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000010},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xd8d1f4a3},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000008},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xb1a3e946},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000004},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x6347d28d},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000002},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xc68fa51a},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00000001},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x8d1f4a35},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00008000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x1a3e946b},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00004000},
+	{0x1d,    5,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x347d28d7},
+	{0xbf,    5,    4,        0, 0x00000000},
+	{0x57,    5,    0,        0, 0x00002000},
+	{0x1d,    5,    2,        1, 0x00000000},
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+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000400},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xbe7f83fb},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000200},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7cff07f7},
+	{0x57,    3,    0,        0, 0x00000100},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf9fe0fee},
+	{0x71,    3,    6,       43, 0x00000000},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000080},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xf3fc1fdc},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000040},
+	{0x79,    5,   10,      -56, 0x00000000},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xe7f83fb8},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000020},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xcff07f70},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000010},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x9fe0fee1},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000008},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x3fc1fdc2},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000004},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0x7f83fb85},
+	{0xbf,    4,    3,        0, 0x00000000},
+	{0x57,    4,    0,        0, 0x00000002},
+	{0x1d,    4,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xff07f70a},
+	{0x57,    3,    0,        0, 0x00000001},
+	{0x1d,    3,    2,        1, 0x00000000},
+	{0xa7,    1,    0,        0, 0xfe0fee15},
+	{0x71,    2,    0,      201, 0x00000000},
+	{0x67,    2,    0,        0, 0x00000008},
+	{0x71,    3,    0,      200, 0x00000000},
+	{0x4f,    2,    3,        0, 0x00000000},
+	{0x71,    3,    0,      203, 0x00000000},
+	{0x67,    3,    0,        0, 0x00000008},
+	{0x71,    4,    0,      202, 0x00000000},
+	{0x4f,    3,    4,        0, 0x00000000},
+	{0x67,    3,    0,        0, 0x00000010},
+	{0x4f,    3,    2,        0, 0x00000000},
+	{0x67,    1,    0,        0, 0x00000020},
+	{0x77,    1,    0,        0, 0x00000020},
+	{0xbf,    2,    1,        0, 0x00000000},
+	{0x3f,    2,    3,        0, 0x00000000},
+	{0x2f,    2,    3,        0, 0x00000000},
+	{0x1f,    1,    2,        0, 0x00000000},
+	{0x57,    1,    0,        0, 0x0000000f},
+	{0x67,    1,    0,        0, 0x00000002},
+	{0x0f,    0,    1,        0, 0x00000000},
+	{0x71,    1,    0,      137, 0x00000000},
+	{0x67,    1,    0,        0, 0x00000008},
+	{0x71,    2,    0,      136, 0x00000000},
+	{0x4f,    1,    2,        0, 0x00000000},
+	{0x71,    2,    0,      138, 0x00000000},
+	{0x71,    3,    0,      139, 0x00000000},
+	{0x67,    3,    0,        0, 0x00000008},
+	{0x4f,    3,    2,        0, 0x00000000},
+	{0x67,    3,    0,        0, 0x00000010},
+	{0x4f,    3,    1,        0, 0x00000000},
+	{0x07,    3,    0,        0, 0x00000001},
+	{0x63,    5,    3,       52, 0x00000000},
+	{0xb7,    7,    0,        0, 0x00000001},
+	{0xbf,    0,    7,        0, 0x00000000},
+	{0x95,    0,    0,        0, 0x00000000},
+};
+
+/**
+ * Load BPF program (section l3_l4) into the kernel and return a bpf fd.
+ *
+ * @param[in] key_idx
+ *   RSS MAP key index
+ *
+ * @param[in] map_fd
+ *   BPF RSS map file descriptor
+ *
+ * @return
+ *   -1 if the BPF program couldn't be loaded. An fd (int) otherwise.
+ */
+int tap_flow_bpf_calc_l3_l4_hash(__u32 key_idx, int map_fd)
+{
+	l3_l4_hash_insns[4].imm = key_idx;
+	l3_l4_hash_insns[9].imm = map_fd;
+
+	return bpf_load(BPF_PROG_TYPE_SCHED_ACT,
+		(struct bpf_insn *)l3_l4_hash_insns,
+		ARRAY_SIZE(l3_l4_hash_insns),
+		"Dual BSD/GPL");
+}
+
+
+#ifndef __NR_bpf
+# if defined(__i386__)
+#  define __NR_bpf 357
+# elif defined(__x86_64__)
+#  define __NR_bpf 321
+# elif defined(__aarch64__)
+#  define __NR_bpf 280
+# elif defined(__sparc__)
+#  define __NR_bpf 349
+# elif defined(__s390__)
+#  define __NR_bpf 351
+# else
+#  error __NR_bpf not defined. libbpf does not support your arch.
+# endif
+#endif
+
+/**
+ * Helper function to convert a pointer to unsigned 64 bits
+ *
+ * @param[in] ptr
+ *   pointer to address
+ *
+ * @return
+ *   64 bit unsigned long type of pointer address
+ */
+static inline __u64 ptr_to_u64(const void *ptr)
+{
+	return (__u64)(unsigned long)ptr;
+}
+
+/**
+ * Call BPF system call
+ *
+ * @param[in] cmd
+ *   BPF command for program loading, map creation, map entry update, etc
+ *
+ * @param[in] attr
+ *   System call attributes relevant to system call command
+ *
+ * @param[in] size
+ *   size of attr parameter
+ *
+ * @return
+ *   -1 if BPF system call failed, 0 otherwise
+ */
+static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
+			unsigned int size)
+{
+	return syscall(__NR_bpf, cmd, attr, size);
+}
+
+/**
+ * Load BPF instructions to kernel
+ *
+ * @param[in] type
+ *   BPF program type: classifieir or action
+ *
+ * @param[in] insns
+ *   Array of BPF instructions (equivalent to BPF instructions)
+ *
+ * @param[in] insns_cnt
+ *   Number of BPF instructions (size of array)
+ *
+ * @param[in] lincense
+ *   License string that must be acknowledged by the kernel
+ *
+ * @return
+ *   -1 if the BPF program couldn't be loaded, fd (file descriptor) otherwise
+ */
+static int bpf_load(enum bpf_prog_type type,
+		  const struct bpf_insn *insns,
+		  size_t insns_cnt,
+		  const char *license)
+{
+	union bpf_attr attr;
+
+	bzero(&attr, sizeof(attr));
+	attr.prog_type = type;
+	attr.insn_cnt = (__u32)insns_cnt;
+	attr.insns = ptr_to_u64(insns);
+	attr.license = ptr_to_u64(license);
+	attr.log_buf = ptr_to_u64(NULL);
+	attr.log_level = 0;
+	attr.kern_version = 0;
+
+	return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
+}
diff --git a/drivers/net/tap/tap_bpf_program.c b/drivers/net/tap/tap_bpf_program.c
new file mode 100644
index 0000000..08bc881
--- /dev/null
+++ b/drivers/net/tap/tap_bpf_program.c
@@ -0,0 +1,221 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2017 Mellanox Technologies, Ltd.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <asm/types.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/if_tunnel.h>
+#include <linux/filter.h>
+#include <linux/bpf.h>
+
+#include "tap_rss.h"
+
+/** Create IPv4 address */
+#define IPv4(a, b, c, d) ((__u32)(((a) & 0xff) << 24) | \
+		(((b) & 0xff) << 16) | \
+		(((c) & 0xff) << 8)  | \
+		((d) & 0xff))
+
+#define PORT(a, b) ((__u16)(((a) & 0xff) << 8) | \
+		((b) & 0xff))
+
+/*
+ * The queue number is offset by 1, to distinguish packets that have
+ * gone through this rule (skb->cb[1] != 0) from others.
+ */
+#define QUEUE_OFFSET		1
+#define PIN_GLOBAL_NS		2
+
+#define KEY_IDX			0
+#define BPF_MAP_ID_KEY	1
+
+struct vlan_hdr {
+	__be16 proto;
+	__be16 tci;
+};
+
+struct bpf_elf_map __attribute__((section("maps"), used))
+map_keys = {
+	.type           =       BPF_MAP_TYPE_HASH,
+	.id             =       BPF_MAP_ID_KEY,
+	.size_key       =       sizeof(__u32),
+	.size_value     =       sizeof(struct rss_key),
+	.max_elem       =       256,
+	.pinning        =       PIN_GLOBAL_NS,
+};
+
+__section("cls_q") int
+match_q(struct __sk_buff *skb)
+{
+	__u32 queue = skb->cb[1];
+	volatile __u32 q = 0xdeadbeef;
+	__u32 match_queue = QUEUE_OFFSET + q;
+
+	/* printt("match_q$i() queue = %d\n", queue); */
+
+	if (queue != match_queue)
+		return TC_ACT_OK;
+	return TC_ACT_UNSPEC;
+}
+
+
+struct ipv4_l3_l4_tuple {
+	__u32    src_addr;
+	__u32    dst_addr;
+	__u16    dport;
+	__u16    sport;
+} __attribute__((packed));
+
+struct ipv6_l3_l4_tuple {
+	__u8        src_addr[16];
+	__u8        dst_addr[16];
+	__u16       dport;
+	__u16       sport;
+} __attribute__((packed));
+
+static const __u8 def_rss_key[] = {
+	0xd1, 0x81, 0xc6, 0x2c,
+	0xf7, 0xf4, 0xdb, 0x5b,
+	0x19, 0x83, 0xa2, 0xfc,
+	0x94, 0x3e, 0x1a, 0xdb,
+	0xd9, 0x38, 0x9e, 0x6b,
+	0xd1, 0x03, 0x9c, 0x2c,
+	0xa7, 0x44, 0x99, 0xad,
+	0x59, 0x3d, 0x56, 0xd9,
+	0xf3, 0x25, 0x3c, 0x06,
+	0x2a, 0xdc, 0x1f, 0xfc,
+};
+
+static __u32  __attribute__((always_inline))
+rte_softrss_be(const __u32 *input_tuple, const uint8_t *rss_key,
+		__u8 input_len)
+{
+	__u32 i, j, hash = 0;
+#pragma unroll
+	for (j = 0; j < input_len; j++) {
+#pragma unroll
+		for (i = 0; i < 32; i++) {
+			if (input_tuple[j] & (1 << (31 - i))) {
+				hash ^= ((const __u32 *)def_rss_key)[j] << i |
+				(__u32)((uint64_t)
+				(((const __u32 *)def_rss_key)[j + 1])
+					>> (32 - i));
+			}
+		}
+	}
+	return hash;
+}
+
+static int __attribute__((always_inline))
+rss_l3_l4(struct __sk_buff *skb)
+{
+	void *data_end = (void *)(long)skb->data_end;
+	void *data = (void *)(long)skb->data;
+	__u16 proto = (__u16)skb->protocol;
+	__u32 key_idx = 0xdeadbeef;
+	__u32 hash;
+	struct rss_key *rsskey;
+	__u64 off = ETH_HLEN;
+	int j;
+	__u8 *key = 0;
+	__u32 len;
+	__u32 queue = 0;
+
+	rsskey = map_lookup_elem(&map_keys, &key_idx);
+	if (!rsskey) {
+		printt("hash(): rss key is not configured\n");
+		return TC_ACT_OK;
+	}
+	key = (__u8 *)rsskey->key;
+
+	/* Get correct proto for 802.1ad */
+	if (skb->vlan_present && skb->vlan_proto == htons(ETH_P_8021AD)) {
+		if (data + ETH_ALEN * 2 + sizeof(struct vlan_hdr) +
+		    sizeof(proto) > data_end)
+			return TC_ACT_OK;
+		proto = *(__u16 *)(data + ETH_ALEN * 2 +
+				   sizeof(struct vlan_hdr));
+		off += sizeof(struct vlan_hdr);
+	}
+
+	if (proto == htons(ETH_P_IP)) {
+		if (data + off + sizeof(struct iphdr) + sizeof(__u32)
+			> data_end)
+			return TC_ACT_OK;
+
+		__u8 *src_dst_addr = data + off + offsetof(struct iphdr, saddr);
+		__u8 *src_dst_port = data + off + sizeof(struct iphdr);
+		struct ipv4_l3_l4_tuple v4_tuple = {
+			.src_addr = IPv4(*(src_dst_addr + 0),
+					*(src_dst_addr + 1),
+					*(src_dst_addr + 2),
+					*(src_dst_addr + 3)),
+			.dst_addr = IPv4(*(src_dst_addr + 4),
+					*(src_dst_addr + 5),
+					*(src_dst_addr + 6),
+					*(src_dst_addr + 7)),
+			.sport = PORT(*(src_dst_port + 0),
+					*(src_dst_port + 1)),
+			.dport = PORT(*(src_dst_port + 2),
+					*(src_dst_port + 3)),
+		};
+		__u8 input_len = sizeof(v4_tuple) / sizeof(__u32);
+		if (rsskey->hash_fields & (1 << HASH_FIELD_IPV4_L3))
+			input_len--;
+		hash = rte_softrss_be((__u32 *)&v4_tuple, key, 3);
+	} else if (proto == htons(ETH_P_IPV6)) {
+		if (data + off + sizeof(struct ipv6hdr) +
+					sizeof(__u32) > data_end)
+			return TC_ACT_OK;
+		__u8 *src_dst_addr = data + off +
+					offsetof(struct ipv6hdr, saddr);
+		__u8 *src_dst_port = data + off +
+					sizeof(struct ipv6hdr);
+		struct ipv6_l3_l4_tuple v6_tuple;
+		for (j = 0; j < 4; j++)
+			*((uint32_t *)&v6_tuple.src_addr + j) =
+				__builtin_bswap32(*((uint32_t *)
+						src_dst_addr + j));
+		for (j = 0; j < 4; j++)
+			*((uint32_t *)&v6_tuple.dst_addr + j) =
+				__builtin_bswap32(*((uint32_t *)
+						src_dst_addr + 4 + j));
+		v6_tuple.sport = PORT(*(src_dst_port + 0),
+			      *(src_dst_port + 1));
+		v6_tuple.dport = PORT(*(src_dst_port + 2),
+			      *(src_dst_port + 3));
+
+		__u8 input_len = sizeof(v6_tuple) / sizeof(__u32);
+		if (rsskey->hash_fields & (1 << HASH_FIELD_IPV6_L3))
+			input_len--;
+		hash = rte_softrss_be((__u32 *)&v6_tuple, key, 9);
+	} else {
+		return TC_ACT_PIPE;
+	}
+
+	queue = rsskey->queues[(hash % rsskey->nb_queues) &
+				       (TAP_MAX_QUEUES - 1)];
+	skb->cb[1] = QUEUE_OFFSET + queue;
+	/* printt(">>>>> rss_l3_l4 hash=0x%x queue=%u\n", hash, queue); */
+
+	return TC_ACT_RECLASSIFY;
+}
+
+#define RSS(L)						\
+	__section(#L) int				\
+		L ## _hash(struct __sk_buff *skb)	\
+	{						\
+		return rss_ ## L (skb);			\
+	}
+
+RSS(l3_l4)
+
+BPF_LICENSE("Dual BSD/GPL");
diff --git a/drivers/net/tap/tap_flow.h b/drivers/net/tap/tap_flow.h
index 9e332b0..6cc01b4 100644
--- a/drivers/net/tap/tap_flow.h
+++ b/drivers/net/tap/tap_flow.h
@@ -50,6 +50,8 @@
 #define GROUP_SHIFT 12
 #define MAX_GROUP GROUP_MASK
 
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+
 /**
  * These index are actually in reversed order: their priority is processed
  * by subtracting their value to the lowest priority (PRIORITY_MASK).
@@ -80,4 +82,7 @@ int tap_flow_implicit_destroy(struct pmd_internals *pmd,
 int tap_flow_implicit_flush(struct pmd_internals *pmd,
 			    struct rte_flow_error *error);
 
+int tap_flow_bpf_cls_q(__u32 queue_idx);
+int tap_flow_bpf_calc_l3_l4_hash(__u32 key_idx, int map_fd);
+
 #endif /* _TAP_FLOW_H_ */
-- 
2.7.4



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