[v4,6/8] examples/l3fwd: add neon support for l3fwd

Message ID 1494819296-23049-7-git-send-email-jianbo.liu@linaro.org
State Superseded
Headers show
Series
  • accelerate examples/l3fwd with NEON on ARM64 platform
Related show

Commit Message

Jianbo Liu May 15, 2017, 3:34 a.m.
Use ARM NEON intrinsics to accelerate l3 fowarding.

Signed-off-by: Jianbo Liu <jianbo.liu@linaro.org>

---
 examples/l3fwd/l3fwd_em.c            |   4 +-
 examples/l3fwd/l3fwd_em_hlm.h        |  17 ++-
 examples/l3fwd/l3fwd_em_hlm_neon.h   |  74 ++++++++++
 examples/l3fwd/l3fwd_em_sequential.h |  18 ++-
 examples/l3fwd/l3fwd_lpm.c           |   4 +-
 examples/l3fwd/l3fwd_lpm_neon.h      | 193 ++++++++++++++++++++++++++
 examples/l3fwd/l3fwd_neon.h          | 259 +++++++++++++++++++++++++++++++++++
 7 files changed, 563 insertions(+), 6 deletions(-)
 create mode 100644 examples/l3fwd/l3fwd_em_hlm_neon.h
 create mode 100644 examples/l3fwd/l3fwd_lpm_neon.h
 create mode 100644 examples/l3fwd/l3fwd_neon.h

-- 
1.8.3.1

Comments

Sekhar, Ashwin May 15, 2017, 5:22 a.m. | #1
On Mon, 2017-05-15 at 11:34 +0800, Jianbo Liu wrote:
> Use ARM NEON intrinsics to accelerate l3 fowarding.

> 

> Signed-off-by: Jianbo Liu <jianbo.liu@linaro.org>

Acked-by: Ashwin Sekhar T K <ashwin.sekhar@caviumnetworks.com>

> ---

>  examples/l3fwd/l3fwd_em.c            |   4 +-

>  examples/l3fwd/l3fwd_em_hlm.h        |  17 ++-

>  examples/l3fwd/l3fwd_em_hlm_neon.h   |  74 ++++++++++

>  examples/l3fwd/l3fwd_em_sequential.h |  18 ++-

>  examples/l3fwd/l3fwd_lpm.c           |   4 +-

>  examples/l3fwd/l3fwd_lpm_neon.h      | 193

> ++++++++++++++++++++++++++

>  examples/l3fwd/l3fwd_neon.h          | 259

> +++++++++++++++++++++++++++++++++++

>  7 files changed, 563 insertions(+), 6 deletions(-)

>  create mode 100644 examples/l3fwd/l3fwd_em_hlm_neon.h

>  create mode 100644 examples/l3fwd/l3fwd_lpm_neon.h

>  create mode 100644 examples/l3fwd/l3fwd_neon.h

> 

> diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c

> index ba844b2..da96cfd 100644

> --- a/examples/l3fwd/l3fwd_em.c

> +++ b/examples/l3fwd/l3fwd_em.c

> @@ -328,7 +328,7 @@ struct ipv6_l3fwd_em_route {

>  	return (uint8_t)((ret < 0) ? portid :

> ipv6_l3fwd_out_if[ret]);

>  }

>  

> -#if defined(__SSE4_1__)

> +#if defined(__SSE4_1__) || defined(RTE_MACHINE_CPUFLAG_NEON)

>  #if defined(NO_HASH_MULTI_LOOKUP)

>  #include "l3fwd_em_sequential.h"

>  #else

> @@ -709,7 +709,7 @@ struct ipv6_l3fwd_em_route {

>  			if (nb_rx == 0)

>  				continue;

>  

> -#if defined(__SSE4_1__)

> +#if defined(__SSE4_1__) || defined(RTE_MACHINE_CPUFLAG_NEON)

>  			l3fwd_em_send_packets(nb_rx, pkts_burst,

>  							portid,

> qconf);

>  #else

> diff --git a/examples/l3fwd/l3fwd_em_hlm.h

> b/examples/l3fwd/l3fwd_em_hlm.h

> index 636dea4..b9163e3 100644

> --- a/examples/l3fwd/l3fwd_em_hlm.h

> +++ b/examples/l3fwd/l3fwd_em_hlm.h

> @@ -35,8 +35,13 @@

>  #ifndef __L3FWD_EM_HLM_H__

>  #define __L3FWD_EM_HLM_H__

>  

> +#if defined(__SSE4_1__)

>  #include "l3fwd_sse.h"

>  #include "l3fwd_em_hlm_sse.h"

> +#elif defined(RTE_MACHINE_CPUFLAG_NEON)

> +#include "l3fwd_neon.h"

> +#include "l3fwd_em_hlm_neon.h"

> +#endif

>  

>  static inline __attribute__((always_inline)) void

>  em_get_dst_port_ipv4x8(struct lcore_conf *qconf, struct rte_mbuf

> *m[8],

> @@ -238,7 +243,7 @@ static inline __attribute__((always_inline))

> uint16_t

>  l3fwd_em_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,

>  		uint8_t portid, struct lcore_conf *qconf)

>  {

> -	int32_t j;

> +	int32_t i, j, pos;

>  	uint16_t dst_port[MAX_PKT_BURST];

>  

>  	/*

> @@ -247,6 +252,11 @@ static inline __attribute__((always_inline))

> uint16_t

>  	 */

>  	int32_t n = RTE_ALIGN_FLOOR(nb_rx, 8);

>  

> +	for (j = 0; j < 8 && j < nb_rx; j++) {

> +		rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j],

> +					       struct ether_hdr *) +

> 1);

> +	}

> +

>  	for (j = 0; j < n; j += 8) {

>  

>  		uint32_t pkt_type =

> @@ -263,6 +273,11 @@ static inline __attribute__((always_inline))

> uint16_t

>  		uint32_t tcp_or_udp = pkt_type &

>  			(RTE_PTYPE_L4_TCP | RTE_PTYPE_L4_UDP);

>  

> +		for (i = 0, pos = j + 8; i < 8 && pos < nb_rx; i++,

> pos++) {

> +			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[po

> s],

> +						       struct

> ether_hdr *) + 1);

> +		}

> +

>  		if (tcp_or_udp && (l3_type == RTE_PTYPE_L3_IPV4)) {

>  

>  			em_get_dst_port_ipv4x8(qconf,

> &pkts_burst[j], portid,

> diff --git a/examples/l3fwd/l3fwd_em_hlm_neon.h

> b/examples/l3fwd/l3fwd_em_hlm_neon.h

> new file mode 100644

> index 0000000..dae1acf

> --- /dev/null

> +++ b/examples/l3fwd/l3fwd_em_hlm_neon.h

> @@ -0,0 +1,74 @@

> +/*-

> + *   BSD LICENSE

> + *

> + *   Copyright(c) 2016 Intel Corporation. All rights reserved.

> + *   Copyright(c) 2017, Linaro Limited

> + *   All rights reserved.

> + *

> + *   Redistribution and use in source and binary forms, with or

> without

> + *   modification, are permitted provided that the following

> conditions

> + *   are met:

> + *

> + *     * Redistributions of source code must retain the above

> copyright

> + *       notice, this list of conditions and the following

> disclaimer.

> + *     * Redistributions in binary form must reproduce the above

> copyright

> + *       notice, this list of conditions and the following

> disclaimer in

> + *       the documentation and/or other materials provided with the

> + *       distribution.

> + *     * Neither the name of Intel Corporation nor the names of its

> + *       contributors may be used to endorse or promote products

> derived

> + *       from this software without specific prior written

> permission.

> + *

> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND

> CONTRIBUTORS

> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

> NOT

> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

> FITNESS FOR

> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

> COPYRIGHT

> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

> INCIDENTAL,

> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

> NOT

> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS

> OF USE,

> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

> ON ANY

> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR

> TORT

> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF

> THE USE

> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

> DAMAGE.

> + */

> +

> +#ifndef __L3FWD_EM_HLM_NEON_H__

> +#define __L3FWD_EM_HLM_NEON_H__

> +

> +#include <arm_neon.h>

> +

> +static inline void

> +get_ipv4_5tuple(struct rte_mbuf *m0, int32x4_t mask0,

> +		union ipv4_5tuple_host *key)

> +{

> +	int32x4_t tmpdata0 = vld1q_s32(rte_pktmbuf_mtod_offset(m0,

> int32_t *,

> +				sizeof(struct ether_hdr) +

> +				offsetof(struct ipv4_hdr,

> time_to_live)));

> +

> +	key->xmm = vandq_s32(tmpdata0, mask0);

> +}

> +

> +static inline void

> +get_ipv6_5tuple(struct rte_mbuf *m0, int32x4_t mask0,

> +		int32x4_t mask1, union ipv6_5tuple_host *key)

> +{

> +	int32x4_t tmpdata0 = vld1q_s32(

> +			rte_pktmbuf_mtod_offset(m0, int *,

> +				sizeof(struct ether_hdr) +

> +				offsetof(struct ipv6_hdr,

> payload_len)));

> +

> +	int32x4_t tmpdata1 = vld1q_s32(

> +			rte_pktmbuf_mtod_offset(m0, int *,

> +				sizeof(struct ether_hdr) +

> +				offsetof(struct ipv6_hdr,

> payload_len) + 8));

> +

> +	int32x4_t tmpdata2 = vld1q_s32(

> +			rte_pktmbuf_mtod_offset(m0, int *,

> +				sizeof(struct ether_hdr) +

> +				offsetof(struct ipv6_hdr,

> payload_len) + 16));

> +

> +	key->xmm[0] = vandq_s32(tmpdata0, mask0);

> +	key->xmm[1] = tmpdata1;

> +	key->xmm[2] = vandq_s32(tmpdata2, mask1);

> +}

> +#endif /* __L3FWD_EM_HLM_NEON_H__ */

> diff --git a/examples/l3fwd/l3fwd_em_sequential.h

> b/examples/l3fwd/l3fwd_em_sequential.h

> index c0a9725..2b3ec16 100644

> --- a/examples/l3fwd/l3fwd_em_sequential.h

> +++ b/examples/l3fwd/l3fwd_em_sequential.h

> @@ -43,7 +43,11 @@

>   * compilation time.

>   */

>  

> +#if defined(__SSE4_1__)

>  #include "l3fwd_sse.h"

> +#elif defined(RTE_MACHINE_CPUFLAG_NEON)

> +#include "l3fwd_neon.h"

> +#endif

>  

>  static inline __attribute__((always_inline)) uint16_t

>  em_get_dst_port(const struct lcore_conf *qconf, struct rte_mbuf

> *pkt,

> @@ -101,11 +105,21 @@ static inline __attribute__((always_inline))

> uint16_t

>  l3fwd_em_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,

>  			uint8_t portid, struct lcore_conf *qconf)

>  {

> -	int32_t j;

> +	int32_t i, j;

>  	uint16_t dst_port[MAX_PKT_BURST];

>  

> -	for (j = 0; j < nb_rx; j++)

> +	if (nb_rx > 0) {

> +		rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[0],

> +					       struct ether_hdr *) +

> 1);

> +	}

> +

> +	for (i = 1, j = 0; j < nb_rx; i++, j++) {

> +		if (i < nb_rx) {

> +			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i]

> ,

> +						       struct

> ether_hdr *) + 1);

> +		}

>  		dst_port[j] = em_get_dst_port(qconf, pkts_burst[j],

> portid);

> +	}

>  

>  	send_packets_multi(qconf, pkts_burst, dst_port, nb_rx);

>  }

> diff --git a/examples/l3fwd/l3fwd_lpm.c b/examples/l3fwd/l3fwd_lpm.c

> index fc554fc..ddef250 100644

> --- a/examples/l3fwd/l3fwd_lpm.c

> +++ b/examples/l3fwd/l3fwd_lpm.c

> @@ -189,6 +189,8 @@ static inline __attribute__((always_inline))

> uint16_t

>  

>  #if defined(__SSE4_1__)

>  #include "l3fwd_lpm_sse.h"

> +#elif defined(RTE_MACHINE_CPUFLAG_NEON)

> +#include "l3fwd_lpm_neon.h"

>  #else

>  #include "l3fwd_lpm.h"

>  #endif

> @@ -261,7 +263,7 @@ static inline __attribute__((always_inline))

> uint16_t

>  			if (nb_rx == 0)

>  				continue;

>  

> -#if defined(__SSE4_1__)

> +#if defined(__SSE4_1__) || defined(RTE_MACHINE_CPUFLAG_NEON)

>  			l3fwd_lpm_send_packets(nb_rx, pkts_burst,

>  						portid, qconf);

>  #else

> diff --git a/examples/l3fwd/l3fwd_lpm_neon.h

> b/examples/l3fwd/l3fwd_lpm_neon.h

> new file mode 100644

> index 0000000..baedbfe

> --- /dev/null

> +++ b/examples/l3fwd/l3fwd_lpm_neon.h

> @@ -0,0 +1,193 @@

> +/*-

> + *   BSD LICENSE

> + *

> + *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.

> + *   Copyright(c) 2017, Linaro Limited

> + *   All rights reserved.

> + *

> + *   Redistribution and use in source and binary forms, with or

> without

> + *   modification, are permitted provided that the following

> conditions

> + *   are met:

> + *

> + *     * Redistributions of source code must retain the above

> copyright

> + *       notice, this list of conditions and the following

> disclaimer.

> + *     * Redistributions in binary form must reproduce the above

> copyright

> + *       notice, this list of conditions and the following

> disclaimer in

> + *       the documentation and/or other materials provided with the

> + *       distribution.

> + *     * Neither the name of Intel Corporation nor the names of its

> + *       contributors may be used to endorse or promote products

> derived

> + *       from this software without specific prior written

> permission.

> + *

> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND

> CONTRIBUTORS

> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

> NOT

> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

> FITNESS FOR

> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

> COPYRIGHT

> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

> INCIDENTAL,

> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

> NOT

> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS

> OF USE,

> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

> ON ANY

> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR

> TORT

> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF

> THE USE

> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

> DAMAGE.

> + */

> +

> +#ifndef __L3FWD_LPM_NEON_H__

> +#define __L3FWD_LPM_NEON_H__

> +

> +#include <arm_neon.h>

> +

> +#include "l3fwd_neon.h"

> +

> +/*

> + * Read packet_type and destination IPV4 addresses from 4 mbufs.

> + */

> +static inline void

> +processx4_step1(struct rte_mbuf *pkt[FWDSTEP],

> +		int32x4_t *dip,

> +		uint32_t *ipv4_flag)

> +{

> +	struct ipv4_hdr *ipv4_hdr;

> +	struct ether_hdr *eth_hdr;

> +	int32_t dst[FWDSTEP];

> +

> +	eth_hdr = rte_pktmbuf_mtod(pkt[0], struct ether_hdr *);

> +	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);

> +	dst[0] = ipv4_hdr->dst_addr;

> +	ipv4_flag[0] = pkt[0]->packet_type & RTE_PTYPE_L3_IPV4;

> +

> +	eth_hdr = rte_pktmbuf_mtod(pkt[1], struct ether_hdr *);

> +	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);

> +	dst[1] = ipv4_hdr->dst_addr;

> +	ipv4_flag[0] &= pkt[1]->packet_type;

> +

> +	eth_hdr = rte_pktmbuf_mtod(pkt[2], struct ether_hdr *);

> +	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);

> +	dst[2] = ipv4_hdr->dst_addr;

> +	ipv4_flag[0] &= pkt[2]->packet_type;

> +

> +	eth_hdr = rte_pktmbuf_mtod(pkt[3], struct ether_hdr *);

> +	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);

> +	dst[3] = ipv4_hdr->dst_addr;

> +	ipv4_flag[0] &= pkt[3]->packet_type;

> +

> +	dip[0] = vld1q_s32(dst);

> +}

> +

> +/*

> + * Lookup into LPM for destination port.

> + * If lookup fails, use incoming port (portid) as destination port.

> + */

> +static inline void

> +processx4_step2(const struct lcore_conf *qconf,

> +		int32x4_t dip,

> +		uint32_t ipv4_flag,

> +		uint8_t portid,

> +		struct rte_mbuf *pkt[FWDSTEP],

> +		uint16_t dprt[FWDSTEP])

> +{

> +	rte_xmm_t dst;

> +

> +	dip =

> vreinterpretq_s32_u8(vrev32q_u8(vreinterpretq_u8_s32(dip)));

> +

> +	/* if all 4 packets are IPV4. */

> +	if (likely(ipv4_flag)) {

> +		rte_lpm_lookupx4(qconf->ipv4_lookup_struct, dip,

> dst.u32,

> +			portid);

> +		/* get rid of unused upper 16 bit for each dport. */

> +		vst1_s16((int16_t *)dprt, vqmovn_s32(dst.x));

> +	} else {

> +		dst.x = dip;

> +		dprt[0] = lpm_get_dst_port_with_ipv4(qconf, pkt[0],

> +						     dst.u32[0],

> portid);

> +		dprt[1] = lpm_get_dst_port_with_ipv4(qconf, pkt[1],

> +						     dst.u32[1],

> portid);

> +		dprt[2] = lpm_get_dst_port_with_ipv4(qconf, pkt[2],

> +						     dst.u32[2],

> portid);

> +		dprt[3] = lpm_get_dst_port_with_ipv4(qconf, pkt[3],

> +						     dst.u32[3],

> portid);

> +	}

> +}

> +

> +/*

> + * Buffer optimized handling of packets, invoked

> + * from main_loop.

> + */

> +static inline void

> +l3fwd_lpm_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,

> +			uint8_t portid, struct lcore_conf *qconf)

> +{

> +	int32_t i = 0, j = 0;

> +	uint16_t dst_port[MAX_PKT_BURST];

> +	int32x4_t dip;

> +	uint32_t ipv4_flag;

> +	const int32_t k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);

> +	const int32_t m = nb_rx % FWDSTEP;

> +

> +	if (k) {

> +		for (i = 0; i < FWDSTEP; i++) {

> +			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i]

> ,

> +						struct ether_hdr *)

> + 1);

> +		}

> +

> +		for (j = 0; j != k - FWDSTEP; j += FWDSTEP) {

> +			for (i = 0; i < FWDSTEP; i++) {

> +				rte_prefetch0(rte_pktmbuf_mtod(

> +						pkts_burst[j + i +

> FWDSTEP],

> +						struct ether_hdr *)

> + 1);

> +			}

> +

> +			processx4_step1(&pkts_burst[j], &dip,

> &ipv4_flag);

> +			processx4_step2(qconf, dip, ipv4_flag,

> portid,

> +					&pkts_burst[j],

> &dst_port[j]);

> +		}

> +

> +		processx4_step1(&pkts_burst[j], &dip, &ipv4_flag);

> +		processx4_step2(qconf, dip, ipv4_flag, portid,

> &pkts_burst[j],

> +				&dst_port[j]);

> +

> +		j += FWDSTEP;

> +	}

> +

> +	if (m) {

> +		/* Prefetch last up to 3 packets one by one */

> +		switch (m) {

> +		case 3:

> +			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j]

> ,

> +						struct ether_hdr *)

> + 1);

> +			j++;

> +			/* fallthrough */

> +		case 2:

> +			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j]

> ,

> +						struct ether_hdr *)

> + 1);

> +			j++;

> +			/* fallthrough */

> +		case 1:

> +			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j]

> ,

> +						struct ether_hdr *)

> + 1);

> +			j++;

> +		}

> +

> +		j -= m;

> +		/* Classify last up to 3 packets one by one */

> +		switch (m) {

> +		case 3:

> +			dst_port[j] = lpm_get_dst_port(qconf,

> pkts_burst[j],

> +						       portid);

> +			j++;

> +			/* fallthrough */

> +		case 2:

> +			dst_port[j] = lpm_get_dst_port(qconf,

> pkts_burst[j],

> +						       portid);

> +			j++;

> +			/* fallthrough */

> +		case 1:

> +			dst_port[j] = lpm_get_dst_port(qconf,

> pkts_burst[j],

> +						       portid);

> +		}

> +	}

> +

> +	send_packets_multi(qconf, pkts_burst, dst_port, nb_rx);

> +}

> +

> +#endif /* __L3FWD_LPM_NEON_H__ */

> diff --git a/examples/l3fwd/l3fwd_neon.h

> b/examples/l3fwd/l3fwd_neon.h

> new file mode 100644

> index 0000000..fe351db

> --- /dev/null

> +++ b/examples/l3fwd/l3fwd_neon.h

> @@ -0,0 +1,259 @@

> +/*-

> + *   BSD LICENSE

> + *

> + *   Copyright(c) 2016 Intel Corporation. All rights reserved.

> + *   Copyright(c) 2017, Linaro Limited

> + *   All rights reserved.

> + *

> + *   Redistribution and use in source and binary forms, with or

> without

> + *   modification, are permitted provided that the following

> conditions

> + *   are met:

> + *

> + *     * Redistributions of source code must retain the above

> copyright

> + *       notice, this list of conditions and the following

> disclaimer.

> + *     * Redistributions in binary form must reproduce the above

> copyright

> + *       notice, this list of conditions and the following

> disclaimer in

> + *       the documentation and/or other materials provided with the

> + *       distribution.

> + *     * Neither the name of Intel Corporation nor the names of its

> + *       contributors may be used to endorse or promote products

> derived

> + *       from this software without specific prior written

> permission.

> + *

> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND

> CONTRIBUTORS

> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

> NOT

> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

> FITNESS FOR

> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

> COPYRIGHT

> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

> INCIDENTAL,

> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

> NOT

> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS

> OF USE,

> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

> ON ANY

> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR

> TORT

> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF

> THE USE

> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

> DAMAGE.

> + */

> +

> +

> +#ifndef _L3FWD_NEON_H_

> +#define _L3FWD_NEON_H_

> +

> +#include "l3fwd.h"

> +#include "l3fwd_common.h"

> +

> +/*

> + * Update source and destination MAC addresses in the ethernet

> header.

> + * Perform RFC1812 checks and updates for IPV4 packets.

> + */

> +static inline void

> +processx4_step3(struct rte_mbuf *pkt[FWDSTEP], uint16_t

> dst_port[FWDSTEP])

> +{

> +	uint32x4_t te[FWDSTEP];

> +	uint32x4_t ve[FWDSTEP];

> +	uint32_t *p[FWDSTEP];

> +

> +	p[0] = rte_pktmbuf_mtod(pkt[0], uint32_t *);

> +	p[1] = rte_pktmbuf_mtod(pkt[1], uint32_t *);

> +	p[2] = rte_pktmbuf_mtod(pkt[2], uint32_t *);

> +	p[3] = rte_pktmbuf_mtod(pkt[3], uint32_t *);

> +

> +	ve[0] = vreinterpretq_u32_s32(val_eth[dst_port[0]]);

> +	te[0] = vld1q_u32(p[0]);

> +

> +	ve[1] = vreinterpretq_u32_s32(val_eth[dst_port[1]]);

> +	te[1] = vld1q_u32(p[1]);

> +

> +	ve[2] = vreinterpretq_u32_s32(val_eth[dst_port[2]]);

> +	te[2] = vld1q_u32(p[2]);

> +

> +	ve[3] = vreinterpretq_u32_s32(val_eth[dst_port[3]]);

> +	te[3] = vld1q_u32(p[3]);

> +

> +	/* Update last 4 bytes */

> +	ve[0] = vsetq_lane_u32(vgetq_lane_u32(te[0], 3), ve[0], 3);

> +	ve[1] = vsetq_lane_u32(vgetq_lane_u32(te[1], 3), ve[1], 3);

> +	ve[2] = vsetq_lane_u32(vgetq_lane_u32(te[2], 3), ve[2], 3);

> +	ve[3] = vsetq_lane_u32(vgetq_lane_u32(te[3], 3), ve[3], 3);

> +

> +	vst1q_u32(p[0], ve[0]);

> +	vst1q_u32(p[1], ve[1]);

> +	vst1q_u32(p[2], ve[2]);

> +	vst1q_u32(p[3], ve[3]);

> +

> +	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[0]

> + 1),

> +		&dst_port[0], pkt[0]->packet_type);

> +	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[1]

> + 1),

> +		&dst_port[1], pkt[1]->packet_type);

> +	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[2]

> + 1),

> +		&dst_port[2], pkt[2]->packet_type);

> +	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[3]

> + 1),

> +		&dst_port[3], pkt[3]->packet_type);

> +}

> +

> +/*

> + * Group consecutive packets with the same destination port in

> bursts of 4.

> + * Suppose we have array of destionation ports:

> + * dst_port[] = {a, b, c, d,, e, ... }

> + * dp1 should contain: <a, b, c, d>, dp2: <b, c, d, e>.

> + * We doing 4 comparisions at once and the result is 4 bit mask.

> + * This mask is used as an index into prebuild array of pnum values.

> + */

> +static inline uint16_t *

> +port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, uint16x8_t dp1,

> +	     uint16x8_t dp2)

> +{

> +	union {

> +		uint16_t u16[FWDSTEP + 1];

> +		uint64_t u64;

> +	} *pnum = (void *)pn;

> +

> +	int32_t v;

> +	uint16x8_t mask = {1, 2, 4, 8, 0, 0, 0, 0};

> +

> +	dp1 = vceqq_u16(dp1, dp2);

> +	dp1 = vandq_u16(dp1, mask);

> +	v = vaddvq_u16(dp1);

> +

> +	/* update last port counter. */

> +	lp[0] += gptbl[v].lpv;

> +

> +	/* if dest port value has changed. */

> +	if (v != GRPMSK) {

> +		pnum->u64 = gptbl[v].pnum;

> +		pnum->u16[FWDSTEP] = 1;

> +		lp = pnum->u16 + gptbl[v].idx;

> +	}

> +

> +	return lp;

> +}

> +

> +/**

> + * Process one packet:

> + * Update source and destination MAC addresses in the ethernet

> header.

> + * Perform RFC1812 checks and updates for IPV4 packets.

> + */

> +static inline void

> +process_packet(struct rte_mbuf *pkt, uint16_t *dst_port)

> +{

> +	struct ether_hdr *eth_hdr;

> +	uint32x4_t te, ve;

> +

> +	eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *);

> +

> +	te = vld1q_u32((uint32_t *)eth_hdr);

> +	ve = vreinterpretq_u32_s32(val_eth[dst_port[0]]);

> +

> +

> +	rfc1812_process((struct ipv4_hdr *)(eth_hdr + 1), dst_port,

> +			pkt->packet_type);

> +

> +	ve = vcopyq_laneq_u32(ve, 3, te, 3);

> +	vst1q_u32((uint32_t *)eth_hdr, ve);

> +}

> +

> +/**

> + * Send packets burst from pkts_burst to the ports in dst_port array

> + */

> +static inline __attribute__((always_inline)) void

> +send_packets_multi(struct lcore_conf *qconf, struct rte_mbuf

> **pkts_burst,

> +		uint16_t dst_port[MAX_PKT_BURST], int nb_rx)

> +{

> +	int32_t k;

> +	int j = 0;

> +	uint16_t dlp;

> +	uint16_t *lp;

> +	uint16_t pnum[MAX_PKT_BURST + 1];

> +

> +	/*

> +	 * Finish packet processing and group consecutive

> +	 * packets with the same destination port.

> +	 */

> +	k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);

> +	if (k != 0) {

> +		uint16x8_t dp1, dp2;

> +

> +		lp = pnum;

> +		lp[0] = 1;

> +

> +		processx4_step3(pkts_burst, dst_port);

> +

> +		/* dp1: <d[0], d[1], d[2], d[3], ... > */

> +		dp1 = vld1q_u16(dst_port);

> +

> +		for (j = FWDSTEP; j != k; j += FWDSTEP) {

> +			processx4_step3(&pkts_burst[j],

> &dst_port[j]);

> +

> +			/*

> +			 * dp2:

> +			 * <d[j-3], d[j-2], d[j-1], d[j], ... >

> +			 */

> +			dp2 = vld1q_u16(&dst_port[j - FWDSTEP + 1]);

> +			lp  = port_groupx4(&pnum[j - FWDSTEP], lp,

> dp1, dp2);

> +

> +			/*

> +			 * dp1:

> +			 * <d[j], d[j+1], d[j+2], d[j+3], ... >

> +			 */

> +			dp1 = vextq_u16(dp1, dp1, FWDSTEP - 1);

> +		}

> +

> +		/*

> +		 * dp2: <d[j-3], d[j-2], d[j-1], d[j-1], ... >

> +		 */

> +		dp2 = vextq_u16(dp1, dp1, 1);

> +		dp2 = vsetq_lane_u16(vgetq_lane_u16(dp2, 2), dp2,

> 3);

> +		lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1,

> dp2);

> +

> +		/*

> +		 * remove values added by the last repeated

> +		 * dst port.

> +		 */

> +		lp[0]--;

> +		dlp = dst_port[j - 1];

> +	} else {

> +		/* set dlp and lp to the never used values. */

> +		dlp = BAD_PORT - 1;

> +		lp = pnum + MAX_PKT_BURST;

> +	}

> +

> +	/* Process up to last 3 packets one by one. */

> +	switch (nb_rx % FWDSTEP) {

> +	case 3:

> +		process_packet(pkts_burst[j], dst_port + j);

> +		GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);

> +		j++;

> +		/* fallthrough */

> +	case 2:

> +		process_packet(pkts_burst[j], dst_port + j);

> +		GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);

> +		j++;

> +		/* fallthrough */

> +	case 1:

> +		process_packet(pkts_burst[j], dst_port + j);

> +		GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);

> +		j++;

> +	}

> +

> +	/*

> +	 * Send packets out, through destination port.

> +	 * Consecutive packets with the same destination port

> +	 * are already grouped together.

> +	 * If destination port for the packet equals BAD_PORT,

> +	 * then free the packet without sending it out.

> +	 */

> +	for (j = 0; j < nb_rx; j += k) {

> +

> +		int32_t m;

> +		uint16_t pn;

> +

> +		pn = dst_port[j];

> +		k = pnum[j];

> +

> +		if (likely(pn != BAD_PORT))

> +			send_packetsx4(qconf, pn, pkts_burst + j,

> k);

> +		else

> +			for (m = j; m != j + k; m++)

> +				rte_pktmbuf_free(pkts_burst[m]);

> +

> +	}

> +}

> +

> +#endif /* _L3FWD_NEON_H_ */

Patch

diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c
index ba844b2..da96cfd 100644
--- a/examples/l3fwd/l3fwd_em.c
+++ b/examples/l3fwd/l3fwd_em.c
@@ -328,7 +328,7 @@  struct ipv6_l3fwd_em_route {
 	return (uint8_t)((ret < 0) ? portid : ipv6_l3fwd_out_if[ret]);
 }
 
-#if defined(__SSE4_1__)
+#if defined(__SSE4_1__) || defined(RTE_MACHINE_CPUFLAG_NEON)
 #if defined(NO_HASH_MULTI_LOOKUP)
 #include "l3fwd_em_sequential.h"
 #else
@@ -709,7 +709,7 @@  struct ipv6_l3fwd_em_route {
 			if (nb_rx == 0)
 				continue;
 
-#if defined(__SSE4_1__)
+#if defined(__SSE4_1__) || defined(RTE_MACHINE_CPUFLAG_NEON)
 			l3fwd_em_send_packets(nb_rx, pkts_burst,
 							portid, qconf);
 #else
diff --git a/examples/l3fwd/l3fwd_em_hlm.h b/examples/l3fwd/l3fwd_em_hlm.h
index 636dea4..b9163e3 100644
--- a/examples/l3fwd/l3fwd_em_hlm.h
+++ b/examples/l3fwd/l3fwd_em_hlm.h
@@ -35,8 +35,13 @@ 
 #ifndef __L3FWD_EM_HLM_H__
 #define __L3FWD_EM_HLM_H__
 
+#if defined(__SSE4_1__)
 #include "l3fwd_sse.h"
 #include "l3fwd_em_hlm_sse.h"
+#elif defined(RTE_MACHINE_CPUFLAG_NEON)
+#include "l3fwd_neon.h"
+#include "l3fwd_em_hlm_neon.h"
+#endif
 
 static inline __attribute__((always_inline)) void
 em_get_dst_port_ipv4x8(struct lcore_conf *qconf, struct rte_mbuf *m[8],
@@ -238,7 +243,7 @@  static inline __attribute__((always_inline)) uint16_t
 l3fwd_em_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
 		uint8_t portid, struct lcore_conf *qconf)
 {
-	int32_t j;
+	int32_t i, j, pos;
 	uint16_t dst_port[MAX_PKT_BURST];
 
 	/*
@@ -247,6 +252,11 @@  static inline __attribute__((always_inline)) uint16_t
 	 */
 	int32_t n = RTE_ALIGN_FLOOR(nb_rx, 8);
 
+	for (j = 0; j < 8 && j < nb_rx; j++) {
+		rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j],
+					       struct ether_hdr *) + 1);
+	}
+
 	for (j = 0; j < n; j += 8) {
 
 		uint32_t pkt_type =
@@ -263,6 +273,11 @@  static inline __attribute__((always_inline)) uint16_t
 		uint32_t tcp_or_udp = pkt_type &
 			(RTE_PTYPE_L4_TCP | RTE_PTYPE_L4_UDP);
 
+		for (i = 0, pos = j + 8; i < 8 && pos < nb_rx; i++, pos++) {
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[pos],
+						       struct ether_hdr *) + 1);
+		}
+
 		if (tcp_or_udp && (l3_type == RTE_PTYPE_L3_IPV4)) {
 
 			em_get_dst_port_ipv4x8(qconf, &pkts_burst[j], portid,
diff --git a/examples/l3fwd/l3fwd_em_hlm_neon.h b/examples/l3fwd/l3fwd_em_hlm_neon.h
new file mode 100644
index 0000000..dae1acf
--- /dev/null
+++ b/examples/l3fwd/l3fwd_em_hlm_neon.h
@@ -0,0 +1,74 @@ 
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2017, Linaro Limited
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __L3FWD_EM_HLM_NEON_H__
+#define __L3FWD_EM_HLM_NEON_H__
+
+#include <arm_neon.h>
+
+static inline void
+get_ipv4_5tuple(struct rte_mbuf *m0, int32x4_t mask0,
+		union ipv4_5tuple_host *key)
+{
+	int32x4_t tmpdata0 = vld1q_s32(rte_pktmbuf_mtod_offset(m0, int32_t *,
+				sizeof(struct ether_hdr) +
+				offsetof(struct ipv4_hdr, time_to_live)));
+
+	key->xmm = vandq_s32(tmpdata0, mask0);
+}
+
+static inline void
+get_ipv6_5tuple(struct rte_mbuf *m0, int32x4_t mask0,
+		int32x4_t mask1, union ipv6_5tuple_host *key)
+{
+	int32x4_t tmpdata0 = vld1q_s32(
+			rte_pktmbuf_mtod_offset(m0, int *,
+				sizeof(struct ether_hdr) +
+				offsetof(struct ipv6_hdr, payload_len)));
+
+	int32x4_t tmpdata1 = vld1q_s32(
+			rte_pktmbuf_mtod_offset(m0, int *,
+				sizeof(struct ether_hdr) +
+				offsetof(struct ipv6_hdr, payload_len) + 8));
+
+	int32x4_t tmpdata2 = vld1q_s32(
+			rte_pktmbuf_mtod_offset(m0, int *,
+				sizeof(struct ether_hdr) +
+				offsetof(struct ipv6_hdr, payload_len) + 16));
+
+	key->xmm[0] = vandq_s32(tmpdata0, mask0);
+	key->xmm[1] = tmpdata1;
+	key->xmm[2] = vandq_s32(tmpdata2, mask1);
+}
+#endif /* __L3FWD_EM_HLM_NEON_H__ */
diff --git a/examples/l3fwd/l3fwd_em_sequential.h b/examples/l3fwd/l3fwd_em_sequential.h
index c0a9725..2b3ec16 100644
--- a/examples/l3fwd/l3fwd_em_sequential.h
+++ b/examples/l3fwd/l3fwd_em_sequential.h
@@ -43,7 +43,11 @@ 
  * compilation time.
  */
 
+#if defined(__SSE4_1__)
 #include "l3fwd_sse.h"
+#elif defined(RTE_MACHINE_CPUFLAG_NEON)
+#include "l3fwd_neon.h"
+#endif
 
 static inline __attribute__((always_inline)) uint16_t
 em_get_dst_port(const struct lcore_conf *qconf, struct rte_mbuf *pkt,
@@ -101,11 +105,21 @@  static inline __attribute__((always_inline)) uint16_t
 l3fwd_em_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
 			uint8_t portid, struct lcore_conf *qconf)
 {
-	int32_t j;
+	int32_t i, j;
 	uint16_t dst_port[MAX_PKT_BURST];
 
-	for (j = 0; j < nb_rx; j++)
+	if (nb_rx > 0) {
+		rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[0],
+					       struct ether_hdr *) + 1);
+	}
+
+	for (i = 1, j = 0; j < nb_rx; i++, j++) {
+		if (i < nb_rx) {
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i],
+						       struct ether_hdr *) + 1);
+		}
 		dst_port[j] = em_get_dst_port(qconf, pkts_burst[j], portid);
+	}
 
 	send_packets_multi(qconf, pkts_burst, dst_port, nb_rx);
 }
diff --git a/examples/l3fwd/l3fwd_lpm.c b/examples/l3fwd/l3fwd_lpm.c
index fc554fc..ddef250 100644
--- a/examples/l3fwd/l3fwd_lpm.c
+++ b/examples/l3fwd/l3fwd_lpm.c
@@ -189,6 +189,8 @@  static inline __attribute__((always_inline)) uint16_t
 
 #if defined(__SSE4_1__)
 #include "l3fwd_lpm_sse.h"
+#elif defined(RTE_MACHINE_CPUFLAG_NEON)
+#include "l3fwd_lpm_neon.h"
 #else
 #include "l3fwd_lpm.h"
 #endif
@@ -261,7 +263,7 @@  static inline __attribute__((always_inline)) uint16_t
 			if (nb_rx == 0)
 				continue;
 
-#if defined(__SSE4_1__)
+#if defined(__SSE4_1__) || defined(RTE_MACHINE_CPUFLAG_NEON)
 			l3fwd_lpm_send_packets(nb_rx, pkts_burst,
 						portid, qconf);
 #else
diff --git a/examples/l3fwd/l3fwd_lpm_neon.h b/examples/l3fwd/l3fwd_lpm_neon.h
new file mode 100644
index 0000000..baedbfe
--- /dev/null
+++ b/examples/l3fwd/l3fwd_lpm_neon.h
@@ -0,0 +1,193 @@ 
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2017, Linaro Limited
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __L3FWD_LPM_NEON_H__
+#define __L3FWD_LPM_NEON_H__
+
+#include <arm_neon.h>
+
+#include "l3fwd_neon.h"
+
+/*
+ * Read packet_type and destination IPV4 addresses from 4 mbufs.
+ */
+static inline void
+processx4_step1(struct rte_mbuf *pkt[FWDSTEP],
+		int32x4_t *dip,
+		uint32_t *ipv4_flag)
+{
+	struct ipv4_hdr *ipv4_hdr;
+	struct ether_hdr *eth_hdr;
+	int32_t dst[FWDSTEP];
+
+	eth_hdr = rte_pktmbuf_mtod(pkt[0], struct ether_hdr *);
+	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
+	dst[0] = ipv4_hdr->dst_addr;
+	ipv4_flag[0] = pkt[0]->packet_type & RTE_PTYPE_L3_IPV4;
+
+	eth_hdr = rte_pktmbuf_mtod(pkt[1], struct ether_hdr *);
+	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
+	dst[1] = ipv4_hdr->dst_addr;
+	ipv4_flag[0] &= pkt[1]->packet_type;
+
+	eth_hdr = rte_pktmbuf_mtod(pkt[2], struct ether_hdr *);
+	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
+	dst[2] = ipv4_hdr->dst_addr;
+	ipv4_flag[0] &= pkt[2]->packet_type;
+
+	eth_hdr = rte_pktmbuf_mtod(pkt[3], struct ether_hdr *);
+	ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
+	dst[3] = ipv4_hdr->dst_addr;
+	ipv4_flag[0] &= pkt[3]->packet_type;
+
+	dip[0] = vld1q_s32(dst);
+}
+
+/*
+ * Lookup into LPM for destination port.
+ * If lookup fails, use incoming port (portid) as destination port.
+ */
+static inline void
+processx4_step2(const struct lcore_conf *qconf,
+		int32x4_t dip,
+		uint32_t ipv4_flag,
+		uint8_t portid,
+		struct rte_mbuf *pkt[FWDSTEP],
+		uint16_t dprt[FWDSTEP])
+{
+	rte_xmm_t dst;
+
+	dip = vreinterpretq_s32_u8(vrev32q_u8(vreinterpretq_u8_s32(dip)));
+
+	/* if all 4 packets are IPV4. */
+	if (likely(ipv4_flag)) {
+		rte_lpm_lookupx4(qconf->ipv4_lookup_struct, dip, dst.u32,
+			portid);
+		/* get rid of unused upper 16 bit for each dport. */
+		vst1_s16((int16_t *)dprt, vqmovn_s32(dst.x));
+	} else {
+		dst.x = dip;
+		dprt[0] = lpm_get_dst_port_with_ipv4(qconf, pkt[0],
+						     dst.u32[0], portid);
+		dprt[1] = lpm_get_dst_port_with_ipv4(qconf, pkt[1],
+						     dst.u32[1], portid);
+		dprt[2] = lpm_get_dst_port_with_ipv4(qconf, pkt[2],
+						     dst.u32[2], portid);
+		dprt[3] = lpm_get_dst_port_with_ipv4(qconf, pkt[3],
+						     dst.u32[3], portid);
+	}
+}
+
+/*
+ * Buffer optimized handling of packets, invoked
+ * from main_loop.
+ */
+static inline void
+l3fwd_lpm_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
+			uint8_t portid, struct lcore_conf *qconf)
+{
+	int32_t i = 0, j = 0;
+	uint16_t dst_port[MAX_PKT_BURST];
+	int32x4_t dip;
+	uint32_t ipv4_flag;
+	const int32_t k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);
+	const int32_t m = nb_rx % FWDSTEP;
+
+	if (k) {
+		for (i = 0; i < FWDSTEP; i++) {
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i],
+						struct ether_hdr *) + 1);
+		}
+
+		for (j = 0; j != k - FWDSTEP; j += FWDSTEP) {
+			for (i = 0; i < FWDSTEP; i++) {
+				rte_prefetch0(rte_pktmbuf_mtod(
+						pkts_burst[j + i + FWDSTEP],
+						struct ether_hdr *) + 1);
+			}
+
+			processx4_step1(&pkts_burst[j], &dip, &ipv4_flag);
+			processx4_step2(qconf, dip, ipv4_flag, portid,
+					&pkts_burst[j], &dst_port[j]);
+		}
+
+		processx4_step1(&pkts_burst[j], &dip, &ipv4_flag);
+		processx4_step2(qconf, dip, ipv4_flag, portid, &pkts_burst[j],
+				&dst_port[j]);
+
+		j += FWDSTEP;
+	}
+
+	if (m) {
+		/* Prefetch last up to 3 packets one by one */
+		switch (m) {
+		case 3:
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j],
+						struct ether_hdr *) + 1);
+			j++;
+			/* fallthrough */
+		case 2:
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j],
+						struct ether_hdr *) + 1);
+			j++;
+			/* fallthrough */
+		case 1:
+			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[j],
+						struct ether_hdr *) + 1);
+			j++;
+		}
+
+		j -= m;
+		/* Classify last up to 3 packets one by one */
+		switch (m) {
+		case 3:
+			dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j],
+						       portid);
+			j++;
+			/* fallthrough */
+		case 2:
+			dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j],
+						       portid);
+			j++;
+			/* fallthrough */
+		case 1:
+			dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j],
+						       portid);
+		}
+	}
+
+	send_packets_multi(qconf, pkts_burst, dst_port, nb_rx);
+}
+
+#endif /* __L3FWD_LPM_NEON_H__ */
diff --git a/examples/l3fwd/l3fwd_neon.h b/examples/l3fwd/l3fwd_neon.h
new file mode 100644
index 0000000..fe351db
--- /dev/null
+++ b/examples/l3fwd/l3fwd_neon.h
@@ -0,0 +1,259 @@ 
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2017, Linaro Limited
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#ifndef _L3FWD_NEON_H_
+#define _L3FWD_NEON_H_
+
+#include "l3fwd.h"
+#include "l3fwd_common.h"
+
+/*
+ * Update source and destination MAC addresses in the ethernet header.
+ * Perform RFC1812 checks and updates for IPV4 packets.
+ */
+static inline void
+processx4_step3(struct rte_mbuf *pkt[FWDSTEP], uint16_t dst_port[FWDSTEP])
+{
+	uint32x4_t te[FWDSTEP];
+	uint32x4_t ve[FWDSTEP];
+	uint32_t *p[FWDSTEP];
+
+	p[0] = rte_pktmbuf_mtod(pkt[0], uint32_t *);
+	p[1] = rte_pktmbuf_mtod(pkt[1], uint32_t *);
+	p[2] = rte_pktmbuf_mtod(pkt[2], uint32_t *);
+	p[3] = rte_pktmbuf_mtod(pkt[3], uint32_t *);
+
+	ve[0] = vreinterpretq_u32_s32(val_eth[dst_port[0]]);
+	te[0] = vld1q_u32(p[0]);
+
+	ve[1] = vreinterpretq_u32_s32(val_eth[dst_port[1]]);
+	te[1] = vld1q_u32(p[1]);
+
+	ve[2] = vreinterpretq_u32_s32(val_eth[dst_port[2]]);
+	te[2] = vld1q_u32(p[2]);
+
+	ve[3] = vreinterpretq_u32_s32(val_eth[dst_port[3]]);
+	te[3] = vld1q_u32(p[3]);
+
+	/* Update last 4 bytes */
+	ve[0] = vsetq_lane_u32(vgetq_lane_u32(te[0], 3), ve[0], 3);
+	ve[1] = vsetq_lane_u32(vgetq_lane_u32(te[1], 3), ve[1], 3);
+	ve[2] = vsetq_lane_u32(vgetq_lane_u32(te[2], 3), ve[2], 3);
+	ve[3] = vsetq_lane_u32(vgetq_lane_u32(te[3], 3), ve[3], 3);
+
+	vst1q_u32(p[0], ve[0]);
+	vst1q_u32(p[1], ve[1]);
+	vst1q_u32(p[2], ve[2]);
+	vst1q_u32(p[3], ve[3]);
+
+	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[0] + 1),
+		&dst_port[0], pkt[0]->packet_type);
+	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[1] + 1),
+		&dst_port[1], pkt[1]->packet_type);
+	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[2] + 1),
+		&dst_port[2], pkt[2]->packet_type);
+	rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[3] + 1),
+		&dst_port[3], pkt[3]->packet_type);
+}
+
+/*
+ * Group consecutive packets with the same destination port in bursts of 4.
+ * Suppose we have array of destionation ports:
+ * dst_port[] = {a, b, c, d,, e, ... }
+ * dp1 should contain: <a, b, c, d>, dp2: <b, c, d, e>.
+ * We doing 4 comparisions at once and the result is 4 bit mask.
+ * This mask is used as an index into prebuild array of pnum values.
+ */
+static inline uint16_t *
+port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, uint16x8_t dp1,
+	     uint16x8_t dp2)
+{
+	union {
+		uint16_t u16[FWDSTEP + 1];
+		uint64_t u64;
+	} *pnum = (void *)pn;
+
+	int32_t v;
+	uint16x8_t mask = {1, 2, 4, 8, 0, 0, 0, 0};
+
+	dp1 = vceqq_u16(dp1, dp2);
+	dp1 = vandq_u16(dp1, mask);
+	v = vaddvq_u16(dp1);
+
+	/* update last port counter. */
+	lp[0] += gptbl[v].lpv;
+
+	/* if dest port value has changed. */
+	if (v != GRPMSK) {
+		pnum->u64 = gptbl[v].pnum;
+		pnum->u16[FWDSTEP] = 1;
+		lp = pnum->u16 + gptbl[v].idx;
+	}
+
+	return lp;
+}
+
+/**
+ * Process one packet:
+ * Update source and destination MAC addresses in the ethernet header.
+ * Perform RFC1812 checks and updates for IPV4 packets.
+ */
+static inline void
+process_packet(struct rte_mbuf *pkt, uint16_t *dst_port)
+{
+	struct ether_hdr *eth_hdr;
+	uint32x4_t te, ve;
+
+	eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
+
+	te = vld1q_u32((uint32_t *)eth_hdr);
+	ve = vreinterpretq_u32_s32(val_eth[dst_port[0]]);
+
+
+	rfc1812_process((struct ipv4_hdr *)(eth_hdr + 1), dst_port,
+			pkt->packet_type);
+
+	ve = vcopyq_laneq_u32(ve, 3, te, 3);
+	vst1q_u32((uint32_t *)eth_hdr, ve);
+}
+
+/**
+ * Send packets burst from pkts_burst to the ports in dst_port array
+ */
+static inline __attribute__((always_inline)) void
+send_packets_multi(struct lcore_conf *qconf, struct rte_mbuf **pkts_burst,
+		uint16_t dst_port[MAX_PKT_BURST], int nb_rx)
+{
+	int32_t k;
+	int j = 0;
+	uint16_t dlp;
+	uint16_t *lp;
+	uint16_t pnum[MAX_PKT_BURST + 1];
+
+	/*
+	 * Finish packet processing and group consecutive
+	 * packets with the same destination port.
+	 */
+	k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);
+	if (k != 0) {
+		uint16x8_t dp1, dp2;
+
+		lp = pnum;
+		lp[0] = 1;
+
+		processx4_step3(pkts_burst, dst_port);
+
+		/* dp1: <d[0], d[1], d[2], d[3], ... > */
+		dp1 = vld1q_u16(dst_port);
+
+		for (j = FWDSTEP; j != k; j += FWDSTEP) {
+			processx4_step3(&pkts_burst[j], &dst_port[j]);
+
+			/*
+			 * dp2:
+			 * <d[j-3], d[j-2], d[j-1], d[j], ... >
+			 */
+			dp2 = vld1q_u16(&dst_port[j - FWDSTEP + 1]);
+			lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1, dp2);
+
+			/*
+			 * dp1:
+			 * <d[j], d[j+1], d[j+2], d[j+3], ... >
+			 */
+			dp1 = vextq_u16(dp1, dp1, FWDSTEP - 1);
+		}
+
+		/*
+		 * dp2: <d[j-3], d[j-2], d[j-1], d[j-1], ... >
+		 */
+		dp2 = vextq_u16(dp1, dp1, 1);
+		dp2 = vsetq_lane_u16(vgetq_lane_u16(dp2, 2), dp2, 3);
+		lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1, dp2);
+
+		/*
+		 * remove values added by the last repeated
+		 * dst port.
+		 */
+		lp[0]--;
+		dlp = dst_port[j - 1];
+	} else {
+		/* set dlp and lp to the never used values. */
+		dlp = BAD_PORT - 1;
+		lp = pnum + MAX_PKT_BURST;
+	}
+
+	/* Process up to last 3 packets one by one. */
+	switch (nb_rx % FWDSTEP) {
+	case 3:
+		process_packet(pkts_burst[j], dst_port + j);
+		GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
+		j++;
+		/* fallthrough */
+	case 2:
+		process_packet(pkts_burst[j], dst_port + j);
+		GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
+		j++;
+		/* fallthrough */
+	case 1:
+		process_packet(pkts_burst[j], dst_port + j);
+		GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
+		j++;
+	}
+
+	/*
+	 * Send packets out, through destination port.
+	 * Consecutive packets with the same destination port
+	 * are already grouped together.
+	 * If destination port for the packet equals BAD_PORT,
+	 * then free the packet without sending it out.
+	 */
+	for (j = 0; j < nb_rx; j += k) {
+
+		int32_t m;
+		uint16_t pn;
+
+		pn = dst_port[j];
+		k = pnum[j];
+
+		if (likely(pn != BAD_PORT))
+			send_packetsx4(qconf, pn, pkts_burst + j, k);
+		else
+			for (m = j; m != j + k; m++)
+				rte_pktmbuf_free(pkts_burst[m]);
+
+	}
+}
+
+#endif /* _L3FWD_NEON_H_ */