Hi,
Please find comments inline.
On Tue, 2017-05-02 at 15:14 +0800, Jianbo Liu wrote:
> Use ARM NEON intrinsics to accelerate l3 fowarding.
>
> Signed-off-by: Jianbo Liu <jianbo....@linaro.org>
> ---
> examples/l3fwd/l3fwd.h | 4 -
> examples/l3fwd/l3fwd_em.c | 4 +-
> examples/l3fwd/l3fwd_em_hlm.h | 5 +
> examples/l3fwd/l3fwd_em_hlm_neon.h | 74 +++++++++++
> examples/l3fwd/l3fwd_em_single.h | 4 +
> examples/l3fwd/l3fwd_lpm.c | 4 +-
> examples/l3fwd/l3fwd_lpm_neon.h | 157 ++++++++++++++++++++++
> examples/l3fwd/l3fwd_neon.h | 259
> +++++++++++++++++++++++++++++++++++++
> 8 files changed, 504 insertions(+), 7 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.h b/examples/l3fwd/l3fwd.h
> index 011ba14..c45589a 100644
> --- a/examples/l3fwd/l3fwd.h
> +++ b/examples/l3fwd/l3fwd.h
> @@ -40,10 +40,6 @@
>
> #define RTE_LOGTYPE_L3FWD RTE_LOGTYPE_USER1
>
> -#if !defined(NO_HASH_MULTI_LOOKUP) &&
> defined(RTE_MACHINE_CPUFLAG_NEON)
> -#define NO_HASH_MULTI_LOOKUP 1
> -#endif
> -
> #define MAX_PKT_BURST 32
> #define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */
>
> diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c
> index cccf797..ac1e2e0 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_single.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..3329c1a 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],
> 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_single.h
> b/examples/l3fwd/l3fwd_em_single.h
> index c0a9725..8604571 100644
> --- a/examples/l3fwd/l3fwd_em_single.h
> +++ b/examples/l3fwd/l3fwd_em_single.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,
> 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..772e54b
> --- /dev/null
> +++ b/examples/l3fwd/l3fwd_lpm_neon.h
> @@ -0,0 +1,157 @@
> +/*-
> + * 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;
> + uint8x16_t bswap_mask = {3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9,
> 8,
> + 15, 14, 13, 12};
> +
> + /* Byte swap 4 IPV4 addresses. */
> + dip =
> vreinterpretq_s32_u8(vqtbl1q_u8(vreinterpretq_u8_s32(dip),
> + bswap_mask));
> +
This can be easily done by vrev32q_u8. With this we can avoid the need
for bswap_mask. Also TBL instruction has higher latency compared to the
rev32 instruction in thunderx, thunderx2t99 and cortexa57.
> + /* 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 j;
> + uint16_t dst_port[MAX_PKT_BURST];
> + int32x4_t dip[MAX_PKT_BURST / FWDSTEP];
> + uint32_t ipv4_flag[MAX_PKT_BURST / FWDSTEP];
> + const int32_t k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);
> +
> + for (j = 0; j != k; j += FWDSTEP)
> + processx4_step1(&pkts_burst[j], &dip[j / FWDSTEP],
> + &ipv4_flag[j / FWDSTEP]);
> +
> + for (j = 0; j != k; j += FWDSTEP)
> + processx4_step2(qconf, dip[j / FWDSTEP],
> + ipv4_flag[j / FWDSTEP], portid,
> &pkts_burst[j],
> + &dst_port[j]);
> +
> + /* Classify last up to 3 packets one by one */
> + switch (nb_rx % FWDSTEP) {
> + 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);
> + j++;
> + }
> +
> + 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..75c8976
> --- /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 = vsetq_lane_u32(vgetq_lane_u32(te, 3), ve, 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_ */
Thanks and Regards
Ashwin
