[PATCH v5 6/8] test: add few eBPF samples

[Konstantin Ananyev <konstantin.ananyev@intel.com>]

Add few simple eBPF programs as an example.

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---
 test/bpf/dummy.c |  20 ++
 test/bpf/mbuf.h  | 578 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/bpf/t1.c    |  52 +++++
 test/bpf/t2.c    |  31 +++
 test/bpf/t3.c    |  36 ++++
 5 files changed, 717 insertions(+)
 create mode 100644 test/bpf/dummy.c
 create mode 100644 test/bpf/mbuf.h
 create mode 100644 test/bpf/t1.c
 create mode 100644 test/bpf/t2.c
 create mode 100644 test/bpf/t3.c

diff --git a/test/bpf/dummy.c b/test/bpf/dummy.c
new file mode 100644
index 000000000..5851469e7
--- /dev/null
+++ b/test/bpf/dummy.c
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+/*
+ * eBPF program sample.
+ * does nothing always return success.
+ * used to measure BPF infrastructure overhead.
+ * To compile:
+ * clang -O2 -target bpf -c dummy.c
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+
+uint64_t
+entry(void *arg)
+{
+	return 1;
+}
diff --git a/test/bpf/mbuf.h b/test/bpf/mbuf.h
new file mode 100644
index 000000000..f24f908d7
--- /dev/null
+++ b/test/bpf/mbuf.h
@@ -0,0 +1,578 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation.
+ * Copyright 2014 6WIND S.A.
+ */
+
+/*
+ * Snipper from dpdk.org rte_mbuf.h.
+ * used to provide BPF programs information about rte_mbuf layout.
+ */
+
+#ifndef _MBUF_H_
+#define _MBUF_H_
+
+#include <stdint.h>
+#include <rte_common.h>
+#include <rte_memory.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Packet Offload Features Flags. It also carry packet type information.
+ * Critical resources. Both rx/tx shared these bits. Be cautious on any change
+ *
+ * - RX flags start at bit position zero, and get added to the left of previous
+ *   flags.
+ * - The most-significant 3 bits are reserved for generic mbuf flags
+ * - TX flags therefore start at bit position 60 (i.e. 63-3), and new flags get
+ *   added to the right of the previously defined flags i.e. they should count
+ *   downwards, not upwards.
+ *
+ * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
+ * rte_get_tx_ol_flag_name().
+ */
+
+/**
+ * RX packet is a 802.1q VLAN packet. This flag was set by PMDs when
+ * the packet is recognized as a VLAN, but the behavior between PMDs
+ * was not the same. This flag is kept for some time to avoid breaking
+ * applications and should be replaced by PKT_RX_VLAN_STRIPPED.
+ */
+#define PKT_RX_VLAN_PKT      (1ULL << 0)
+
+#define PKT_RX_RSS_HASH      (1ULL << 1)
+/**< RX packet with RSS hash result. */
+#define PKT_RX_FDIR          (1ULL << 2)
+/**< RX packet with FDIR match indicate. */
+
+/**
+ * Deprecated.
+ * Checking this flag alone is deprecated: check the 2 bits of
+ * PKT_RX_L4_CKSUM_MASK.
+ * This flag was set when the L4 checksum of a packet was detected as
+ * wrong by the hardware.
+ */
+#define PKT_RX_L4_CKSUM_BAD  (1ULL << 3)
+
+/**
+ * Deprecated.
+ * Checking this flag alone is deprecated: check the 2 bits of
+ * PKT_RX_IP_CKSUM_MASK.
+ * This flag was set when the IP checksum of a packet was detected as
+ * wrong by the hardware.
+ */
+#define PKT_RX_IP_CKSUM_BAD  (1ULL << 4)
+
+#define PKT_RX_EIP_CKSUM_BAD (1ULL << 5)
+/**< External IP header checksum error. */
+
+/**
+ * A vlan has been stripped by the hardware and its tci is saved in
+ * mbuf->vlan_tci. This can only happen if vlan stripping is enabled
+ * in the RX configuration of the PMD.
+ */
+#define PKT_RX_VLAN_STRIPPED (1ULL << 6)
+
+/**
+ * Mask of bits used to determine the status of RX IP checksum.
+ * - PKT_RX_IP_CKSUM_UNKNOWN: no information about the RX IP checksum
+ * - PKT_RX_IP_CKSUM_BAD: the IP checksum in the packet is wrong
+ * - PKT_RX_IP_CKSUM_GOOD: the IP checksum in the packet is valid
+ * - PKT_RX_IP_CKSUM_NONE: the IP checksum is not correct in the packet
+ *   data, but the integrity of the IP header is verified.
+ */
+#define PKT_RX_IP_CKSUM_MASK ((1ULL << 4) | (1ULL << 7))
+
+#define PKT_RX_IP_CKSUM_UNKNOWN 0
+#define PKT_RX_IP_CKSUM_BAD     (1ULL << 4)
+#define PKT_RX_IP_CKSUM_GOOD    (1ULL << 7)
+#define PKT_RX_IP_CKSUM_NONE    ((1ULL << 4) | (1ULL << 7))
+
+/**
+ * Mask of bits used to determine the status of RX L4 checksum.
+ * - PKT_RX_L4_CKSUM_UNKNOWN: no information about the RX L4 checksum
+ * - PKT_RX_L4_CKSUM_BAD: the L4 checksum in the packet is wrong
+ * - PKT_RX_L4_CKSUM_GOOD: the L4 checksum in the packet is valid
+ * - PKT_RX_L4_CKSUM_NONE: the L4 checksum is not correct in the packet
+ *   data, but the integrity of the L4 data is verified.
+ */
+#define PKT_RX_L4_CKSUM_MASK ((1ULL << 3) | (1ULL << 8))
+
+#define PKT_RX_L4_CKSUM_UNKNOWN 0
+#define PKT_RX_L4_CKSUM_BAD     (1ULL << 3)
+#define PKT_RX_L4_CKSUM_GOOD    (1ULL << 8)
+#define PKT_RX_L4_CKSUM_NONE    ((1ULL << 3) | (1ULL << 8))
+
+#define PKT_RX_IEEE1588_PTP  (1ULL << 9)
+/**< RX IEEE1588 L2 Ethernet PT Packet. */
+#define PKT_RX_IEEE1588_TMST (1ULL << 10)
+/**< RX IEEE1588 L2/L4 timestamped packet.*/
+#define PKT_RX_FDIR_ID       (1ULL << 13)
+/**< FD id reported if FDIR match. */
+#define PKT_RX_FDIR_FLX      (1ULL << 14)
+/**< Flexible bytes reported if FDIR match. */
+
+/**
+ * The 2 vlans have been stripped by the hardware and their tci are
+ * saved in mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer).
+ * This can only happen if vlan stripping is enabled in the RX
+ * configuration of the PMD. If this flag is set, PKT_RX_VLAN_STRIPPED
+ * must also be set.
+ */
+#define PKT_RX_QINQ_STRIPPED (1ULL << 15)
+
+/**
+ * Deprecated.
+ * RX packet with double VLAN stripped.
+ * This flag is replaced by PKT_RX_QINQ_STRIPPED.
+ */
+#define PKT_RX_QINQ_PKT      PKT_RX_QINQ_STRIPPED
+
+/**
+ * When packets are coalesced by a hardware or virtual driver, this flag
+ * can be set in the RX mbuf, meaning that the m->tso_segsz field is
+ * valid and is set to the segment size of original packets.
+ */
+#define PKT_RX_LRO           (1ULL << 16)
+
+/**
+ * Indicate that the timestamp field in the mbuf is valid.
+ */
+#define PKT_RX_TIMESTAMP     (1ULL << 17)
+
+/* add new RX flags here */
+
+/* add new TX flags here */
+
+/**
+ * Offload the MACsec. This flag must be set by the application to enable
+ * this offload feature for a packet to be transmitted.
+ */
+#define PKT_TX_MACSEC        (1ULL << 44)
+
+/**
+ * Bits 45:48 used for the tunnel type.
+ * When doing Tx offload like TSO or checksum, the HW needs to configure the
+ * tunnel type into the HW descriptors.
+ */
+#define PKT_TX_TUNNEL_VXLAN   (0x1ULL << 45)
+#define PKT_TX_TUNNEL_GRE     (0x2ULL << 45)
+#define PKT_TX_TUNNEL_IPIP    (0x3ULL << 45)
+#define PKT_TX_TUNNEL_GENEVE  (0x4ULL << 45)
+/**< TX packet with MPLS-in-UDP RFC 7510 header. */
+#define PKT_TX_TUNNEL_MPLSINUDP (0x5ULL << 45)
+/* add new TX TUNNEL type here */
+#define PKT_TX_TUNNEL_MASK    (0xFULL << 45)
+
+/**
+ * Second VLAN insertion (QinQ) flag.
+ */
+#define PKT_TX_QINQ_PKT    (1ULL << 49)
+/**< TX packet with double VLAN inserted. */
+
+/**
+ * TCP segmentation offload. To enable this offload feature for a
+ * packet to be transmitted on hardware supporting TSO:
+ *  - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
+ *    PKT_TX_TCP_CKSUM)
+ *  - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
+ *  - if it's IPv4, set the PKT_TX_IP_CKSUM flag and write the IP checksum
+ *    to 0 in the packet
+ *  - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
+ *  - calculate the pseudo header checksum without taking ip_len in account,
+ *    and set it in the TCP header. Refer to rte_ipv4_phdr_cksum() and
+ *    rte_ipv6_phdr_cksum() that can be used as helpers.
+ */
+#define PKT_TX_TCP_SEG       (1ULL << 50)
+
+#define PKT_TX_IEEE1588_TMST (1ULL << 51)
+/**< TX IEEE1588 packet to timestamp. */
+
+/**
+ * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
+ * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
+ * L4 checksum offload, the user needs to:
+ *  - fill l2_len and l3_len in mbuf
+ *  - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
+ *  - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
+ *  - calculate the pseudo header checksum and set it in the L4 header (only
+ *    for TCP or UDP). See rte_ipv4_phdr_cksum() and rte_ipv6_phdr_cksum().
+ *    For SCTP, set the crc field to 0.
+ */
+#define PKT_TX_L4_NO_CKSUM   (0ULL << 52)
+/**< Disable L4 cksum of TX pkt. */
+#define PKT_TX_TCP_CKSUM     (1ULL << 52)
+/**< TCP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_SCTP_CKSUM    (2ULL << 52)
+/**< SCTP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_UDP_CKSUM     (3ULL << 52)
+/**< UDP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_L4_MASK       (3ULL << 52)
+/**< Mask for L4 cksum offload request. */
+
+/**
+ * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
+ * also be set by the application, although a PMD will only check
+ * PKT_TX_IP_CKSUM.
+ *  - set the IP checksum field in the packet to 0
+ *  - fill the mbuf offload information: l2_len, l3_len
+ */
+#define PKT_TX_IP_CKSUM      (1ULL << 54)
+
+/**
+ * Packet is IPv4. This flag must be set when using any offload feature
+ * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
+ * packet. If the packet is a tunneled packet, this flag is related to
+ * the inner headers.
+ */
+#define PKT_TX_IPV4          (1ULL << 55)
+
+/**
+ * Packet is IPv6. This flag must be set when using an offload feature
+ * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
+ * packet. If the packet is a tunneled packet, this flag is related to
+ * the inner headers.
+ */
+#define PKT_TX_IPV6          (1ULL << 56)
+
+#define PKT_TX_VLAN_PKT      (1ULL << 57)
+/**< TX packet is a 802.1q VLAN packet. */
+
+/**
+ * Offload the IP checksum of an external header in the hardware. The
+ * flag PKT_TX_OUTER_IPV4 should also be set by the application, alto ugh
+ * a PMD will only check PKT_TX_IP_CKSUM.  The IP checksum field in the
+ * packet must be set to 0.
+ *  - set the outer IP checksum field in the packet to 0
+ *  - fill the mbuf offload information: outer_l2_len, outer_l3_len
+ */
+#define PKT_TX_OUTER_IP_CKSUM   (1ULL << 58)
+
+/**
+ * Packet outer header is IPv4. This flag must be set when using any
+ * outer offload feature (L3 or L4 checksum) to tell the NIC that the
+ * outer header of the tunneled packet is an IPv4 packet.
+ */
+#define PKT_TX_OUTER_IPV4   (1ULL << 59)
+
+/**
+ * Packet outer header is IPv6. This flag must be set when using any
+ * outer offload feature (L4 checksum) to tell the NIC that the outer
+ * header of the tunneled packet is an IPv6 packet.
+ */
+#define PKT_TX_OUTER_IPV6    (1ULL << 60)
+
+/**
+ * Bitmask of all supported packet Tx offload features flags,
+ * which can be set for packet.
+ */
+#define PKT_TX_OFFLOAD_MASK (    \
+		PKT_TX_IP_CKSUM |        \
+		PKT_TX_L4_MASK |         \
+		PKT_TX_OUTER_IP_CKSUM |  \
+		PKT_TX_TCP_SEG |         \
+		PKT_TX_IEEE1588_TMST |	 \
+		PKT_TX_QINQ_PKT |        \
+		PKT_TX_VLAN_PKT |        \
+		PKT_TX_TUNNEL_MASK |	 \
+		PKT_TX_MACSEC)
+
+#define __RESERVED           (1ULL << 61) /**< reserved for future mbuf use */
+
+#define IND_ATTACHED_MBUF    (1ULL << 62) /**< Indirect attached mbuf */
+
+/* Use final bit of flags to indicate a control mbuf */
+#define CTRL_MBUF_FLAG       (1ULL << 63) /**< Mbuf contains control data */
+
+/** Alignment constraint of mbuf private area. */
+#define RTE_MBUF_PRIV_ALIGN 8
+
+/**
+ * Get the name of a RX offload flag
+ *
+ * @param mask
+ *   The mask describing the flag.
+ * @return
+ *   The name of this flag, or NULL if it's not a valid RX flag.
+ */
+const char *rte_get_rx_ol_flag_name(uint64_t mask);
+
+/**
+ * Dump the list of RX offload flags in a buffer
+ *
+ * @param mask
+ *   The mask describing the RX flags.
+ * @param buf
+ *   The output buffer.
+ * @param buflen
+ *   The length of the buffer.
+ * @return
+ *   0 on success, (-1) on error.
+ */
+int rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
+
+/**
+ * Get the name of a TX offload flag
+ *
+ * @param mask
+ *   The mask describing the flag. Usually only one bit must be set.
+ *   Several bits can be given if they belong to the same mask.
+ *   Ex: PKT_TX_L4_MASK.
+ * @return
+ *   The name of this flag, or NULL if it's not a valid TX flag.
+ */
+const char *rte_get_tx_ol_flag_name(uint64_t mask);
+
+/**
+ * Dump the list of TX offload flags in a buffer
+ *
+ * @param mask
+ *   The mask describing the TX flags.
+ * @param buf
+ *   The output buffer.
+ * @param buflen
+ *   The length of the buffer.
+ * @return
+ *   0 on success, (-1) on error.
+ */
+int rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
+
+/**
+ * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
+ * splitting it into multiple segments.
+ * So, for mbufs that planned to be involved into RX/TX, the recommended
+ * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
+ */
+#define	RTE_MBUF_DEFAULT_DATAROOM	2048
+#define	RTE_MBUF_DEFAULT_BUF_SIZE	\
+	(RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
+
+/* define a set of marker types that can be used to refer to set points in the
+ * mbuf.
+ */
+__extension__
+typedef void    *MARKER[0];   /**< generic marker for a point in a structure */
+__extension__
+typedef uint8_t  MARKER8[0];  /**< generic marker with 1B alignment */
+__extension__
+typedef uint64_t MARKER64[0];
+/**< marker that allows us to overwrite 8 bytes with a single assignment */
+
+typedef struct {
+	volatile int16_t cnt; /**< An internal counter value. */
+} rte_atomic16_t;
+
+/**
+ * The generic rte_mbuf, containing a packet mbuf.
+ */
+struct rte_mbuf {
+	MARKER cacheline0;
+
+	void *buf_addr;           /**< Virtual address of segment buffer. */
+	/**
+	 * Physical address of segment buffer.
+	 * Force alignment to 8-bytes, so as to ensure we have the exact
+	 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
+	 * working on vector drivers easier.
+	 */
+	phys_addr_t buf_physaddr __rte_aligned(sizeof(phys_addr_t));
+
+	/* next 8 bytes are initialised on RX descriptor rearm */
+	MARKER64 rearm_data;
+	uint16_t data_off;
+
+	/**
+	 * Reference counter. Its size should at least equal to the size
+	 * of port field (16 bits), to support zero-copy broadcast.
+	 * It should only be accessed using the following functions:
+	 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
+	 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
+	 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
+	 * config option.
+	 */
+	RTE_STD_C11
+	union {
+		rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
+		uint16_t refcnt;
+		/**< Non-atomically accessed refcnt */
+	};
+	uint16_t nb_segs;         /**< Number of segments. */
+
+	/** Input port (16 bits to support more than 256 virtual ports). */
+	uint16_t port;
+
+	uint64_t ol_flags;        /**< Offload features. */
+
+	/* remaining bytes are set on RX when pulling packet from descriptor */
+	MARKER rx_descriptor_fields1;
+
+	/*
+	 * The packet type, which is the combination of outer/inner L2, L3, L4
+	 * and tunnel types. The packet_type is about data really present in the
+	 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
+	 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
+	 * vlan is stripped from the data.
+	 */
+	RTE_STD_C11
+	union {
+		uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
+		struct {
+			uint32_t l2_type:4; /**< (Outer) L2 type. */
+			uint32_t l3_type:4; /**< (Outer) L3 type. */
+			uint32_t l4_type:4; /**< (Outer) L4 type. */
+			uint32_t tun_type:4; /**< Tunnel type. */
+			uint32_t inner_l2_type:4; /**< Inner L2 type. */
+			uint32_t inner_l3_type:4; /**< Inner L3 type. */
+			uint32_t inner_l4_type:4; /**< Inner L4 type. */
+		};
+	};
+
+	uint32_t pkt_len;         /**< Total pkt len: sum of all segments. */
+	uint16_t data_len;        /**< Amount of data in segment buffer. */
+	/** VLAN TCI (CPU order), valid if PKT_RX_VLAN_STRIPPED is set. */
+	uint16_t vlan_tci;
+
+	union {
+		uint32_t rss;     /**< RSS hash result if RSS enabled */
+		struct {
+			RTE_STD_C11
+			union {
+				struct {
+					uint16_t hash;
+					uint16_t id;
+				};
+				uint32_t lo;
+				/**< Second 4 flexible bytes */
+			};
+			uint32_t hi;
+			/**< First 4 flexible bytes or FD ID, dependent on
+			 *   PKT_RX_FDIR_* flag in ol_flags.
+			 */
+		} fdir;           /**< Filter identifier if FDIR enabled */
+		struct {
+			uint32_t lo;
+			uint32_t hi;
+		} sched;          /**< Hierarchical scheduler */
+		uint32_t usr;
+		/**< User defined tags. See rte_distributor_process() */
+	} hash;                   /**< hash information */
+
+	/** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ_STRIPPED is set. */
+	uint16_t vlan_tci_outer;
+
+	uint16_t buf_len;         /**< Length of segment buffer. */
+
+	/** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
+	 * are not normalized but are always the same for a given port.
+	 */
+	uint64_t timestamp;
+
+	/* second cache line - fields only used in slow path or on TX */
+	MARKER cacheline1 __rte_cache_min_aligned;
+
+	RTE_STD_C11
+	union {
+		void *userdata;   /**< Can be used for external metadata */
+		uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
+	};
+
+	struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
+	struct rte_mbuf *next;    /**< Next segment of scattered packet. */
+
+	/* fields to support TX offloads */
+	RTE_STD_C11
+	union {
+		uint64_t tx_offload;       /**< combined for easy fetch */
+		__extension__
+		struct {
+			uint64_t l2_len:7;
+			/**< L2 (MAC) Header Length for non-tunneling pkt.
+			 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
+			 */
+			uint64_t l3_len:9; /**< L3 (IP) Header Length. */
+			uint64_t l4_len:8; /**< L4 (TCP/UDP) Header Length. */
+			uint64_t tso_segsz:16; /**< TCP TSO segment size */
+
+			/* fields for TX offloading of tunnels */
+			uint64_t outer_l3_len:9;
+			/**< Outer L3 (IP) Hdr Length. */
+			uint64_t outer_l2_len:7;
+			/**< Outer L2 (MAC) Hdr Length. */
+
+			/* uint64_t unused:8; */
+		};
+	};
+
+	/** Size of the application private data. In case of an indirect
+	 * mbuf, it stores the direct mbuf private data size.
+	 */
+	uint16_t priv_size;
+
+	/** Timesync flags for use with IEEE1588. */
+	uint16_t timesync;
+
+	/** Sequence number. See also rte_reorder_insert(). */
+	uint32_t seqn;
+
+} __rte_cache_aligned;
+
+
+/**
+ * Returns TRUE if given mbuf is indirect, or FALSE otherwise.
+ */
+#define RTE_MBUF_INDIRECT(mb)   ((mb)->ol_flags & IND_ATTACHED_MBUF)
+
+/**
+ * Returns TRUE if given mbuf is direct, or FALSE otherwise.
+ */
+#define RTE_MBUF_DIRECT(mb)     (!RTE_MBUF_INDIRECT(mb))
+
+/**
+ * Private data in case of pktmbuf pool.
+ *
+ * A structure that contains some pktmbuf_pool-specific data that are
+ * appended after the mempool structure (in private data).
+ */
+struct rte_pktmbuf_pool_private {
+	uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
+	uint16_t mbuf_priv_size;      /**< Size of private area in each mbuf. */
+};
+
+/**
+ * A macro that points to an offset into the data in the mbuf.
+ *
+ * The returned pointer is cast to type t. Before using this
+ * function, the user must ensure that the first segment is large
+ * enough to accommodate its data.
+ *
+ * @param m
+ *   The packet mbuf.
+ * @param o
+ *   The offset into the mbuf data.
+ * @param t
+ *   The type to cast the result into.
+ */
+#define rte_pktmbuf_mtod_offset(m, t, o)	\
+	((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
+
+/**
+ * A macro that points to the start of the data in the mbuf.
+ *
+ * The returned pointer is cast to type t. Before using this
+ * function, the user must ensure that the first segment is large
+ * enough to accommodate its data.
+ *
+ * @param m
+ *   The packet mbuf.
+ * @param t
+ *   The type to cast the result into.
+ */
+#define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _MBUF_H_ */
diff --git a/test/bpf/t1.c b/test/bpf/t1.c
new file mode 100644
index 000000000..60f9434ab
--- /dev/null
+++ b/test/bpf/t1.c
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+/*
+ * eBPF program sample.
+ * Accepts pointer to first segment packet data as an input parameter.
+ * analog of tcpdump -s 1 -d 'dst 1.2.3.4 && udp && dst port 5000'
+ * (000) ldh      [12]
+ * (001) jeq      #0x800           jt 2    jf 12
+ * (002) ld       [30]
+ * (003) jeq      #0x1020304       jt 4    jf 12
+ * (004) ldb      [23]
+ * (005) jeq      #0x11            jt 6    jf 12
+ * (006) ldh      [20]
+ * (007) jset     #0x1fff          jt 12   jf 8
+ * (008) ldxb     4*([14]&0xf)
+ * (009) ldh      [x + 16]
+ * (010) jeq      #0x1388          jt 11   jf 12
+ * (011) ret      #1
+ * (012) ret      #0
+ *
+ * To compile:
+ * clang -O2 -target bpf -c t1.c
+ */
+
+#include <stdint.h>
+#include <net/ethernet.h>
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+
+uint64_t
+entry(void *pkt)
+{
+	struct ether_header *ether_header = (void *)pkt;
+
+	if (ether_header->ether_type != __builtin_bswap16(0x0800))
+		return 0;
+
+	struct iphdr *iphdr = (void *)(ether_header + 1);
+	if (iphdr->protocol != 17 || (iphdr->frag_off & 0x1ffff) != 0 ||
+			iphdr->daddr != __builtin_bswap32(0x1020304))
+		return 0;
+
+	int hlen = iphdr->ihl * 4;
+	struct udphdr *udphdr = (void *)iphdr + hlen;
+
+	if (udphdr->dest !=  __builtin_bswap16(5000))
+		return 0;
+
+	return 1;
+}
diff --git a/test/bpf/t2.c b/test/bpf/t2.c
new file mode 100644
index 000000000..69d7a4fe1
--- /dev/null
+++ b/test/bpf/t2.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+/*
+ * eBPF program sample.
+ * Accepts pointer to struct rte_mbuf as an input parameter.
+ * cleanup mbuf's vlan_tci and all related RX flags
+ * (PKT_RX_VLAN_PKT | PKT_RX_VLAN_STRIPPED).
+ * Doesn't touch contents of packet data.
+ * To compile:
+ * clang -O2 -I${RTE_SDK}/${RTE_TARGET}/include \
+ * -target bpf -Wno-int-to-void-pointer-cast -c t2.c
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <rte_config.h>
+#include "mbuf.h"
+
+uint64_t
+entry(void *pkt)
+{
+	struct rte_mbuf *mb;
+
+	mb = pkt;
+	mb->vlan_tci = 0;
+	mb->ol_flags &= ~(PKT_RX_VLAN_PKT | PKT_RX_VLAN_STRIPPED);
+
+	return 1;
+}
diff --git a/test/bpf/t3.c b/test/bpf/t3.c
new file mode 100644
index 000000000..531b9cb8c
--- /dev/null
+++ b/test/bpf/t3.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+/*
+ * eBPF program sample.
+ * Accepts pointer to struct rte_mbuf as an input parameter.
+ * Dump the mbuf into stdout if it is an ARP packet (aka tcpdump 'arp').
+ * To compile:
+ * clang -O2 -I${RTE_SDK}/${RTE_TARGET}/include \
+ * -target bpf -Wno-int-to-void-pointer-cast -c t3.c
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <net/ethernet.h>
+#include <rte_config.h>
+#include "mbuf.h"
+
+extern void rte_pktmbuf_dump(FILE *, const struct rte_mbuf *, unsigned int);
+
+uint64_t
+entry(const void *pkt)
+{
+	const struct rte_mbuf *mb;
+	const struct ether_header *eth;
+
+	mb = pkt;
+	eth = rte_pktmbuf_mtod(mb, const struct ether_header *);
+
+	if (eth->ether_type == __builtin_bswap16(ETHERTYPE_ARP))
+		rte_pktmbuf_dump(stdout, mb, 64);
+
+	return 1;
+}
-- 
2.13.6