diff options
Diffstat (limited to 'examples/l3fwd/l3fwd_neon.h')
| -rw-r--r-- | examples/l3fwd/l3fwd_neon.h | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/examples/l3fwd/l3fwd_neon.h b/examples/l3fwd/l3fwd_neon.h new file mode 100644 index 00000000..42d50d3c --- /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 comparisons 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 __rte_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_ */ |