examples/l3fwd/l3fwd_lpm_altivec.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2016 Intel Corporation.
   3  * Copyright(c) 2017 IBM Corporation.
   4  * All rights reserved.
   5  */
   6
   7 #ifndef __L3FWD_LPM_ALTIVEC_H__
   8 #define __L3FWD_LPM_ALTIVEC_H__
   9
  10 #include "l3fwd_altivec.h"
  11
  12 /*
  13  * Read packet_type and destination IPV4 addresses from 4 mbufs.
  14  */
  15 static inline void
  16 processx4_step1(struct rte_mbuf *pkt[FWDSTEP],
  17                 vector unsigned int *dip,
  18                 uint32_t *ipv4_flag)
  19 {
  20         struct ipv4_hdr *ipv4_hdr;
  21         struct rte_ether_hdr *eth_hdr;
  22         uint32_t x0, x1, x2, x3;
  23
  24         eth_hdr = rte_pktmbuf_mtod(pkt[0], struct rte_ether_hdr *);
  25         ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
  26         x0 = ipv4_hdr->dst_addr;
  27         ipv4_flag[0] = pkt[0]->packet_type & RTE_PTYPE_L3_IPV4;
  28
  29         rte_compiler_barrier();
  30         eth_hdr = rte_pktmbuf_mtod(pkt[1], struct rte_ether_hdr *);
  31         ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
  32         x1 = ipv4_hdr->dst_addr;
  33         ipv4_flag[0] &= pkt[1]->packet_type;
  34
  35         rte_compiler_barrier();
  36         eth_hdr = rte_pktmbuf_mtod(pkt[2], struct rte_ether_hdr *);
  37         ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
  38         x2 = ipv4_hdr->dst_addr;
  39         ipv4_flag[0] &= pkt[2]->packet_type;
  40
  41         rte_compiler_barrier();
  42         eth_hdr = rte_pktmbuf_mtod(pkt[3], struct rte_ether_hdr *);
  43         ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1);
  44         x3 = ipv4_hdr->dst_addr;
  45         ipv4_flag[0] &= pkt[3]->packet_type;
  46
  47         rte_compiler_barrier();
  48         dip[0] = (vector unsigned int){x0, x1, x2, x3};
  49 }
  50
  51 /*
  52  * Lookup into LPM for destination port.
  53  * If lookup fails, use incoming port (portid) as destination port.
  54  */
  55 static inline void
  56 processx4_step2(const struct lcore_conf *qconf,
  57                 vector unsigned int dip,
  58                 uint32_t ipv4_flag,
  59                 uint8_t portid,
  60                 struct rte_mbuf *pkt[FWDSTEP],
  61                 uint16_t dprt[FWDSTEP])
  62 {
  63         rte_xmm_t dst;
  64         const vector unsigned char bswap_mask = (vector unsigned char){
  65                                                         3, 2, 1, 0,
  66                                                         7, 6, 5, 4,
  67                                                         11, 10, 9, 8,
  68                                                         15, 14, 13, 12};
  69
  70         /* Byte swap 4 IPV4 addresses. */
  71         dip = (vector unsigned int)vec_perm(*(vector unsigned char *)&dip,
  72                                         (vector unsigned char){}, bswap_mask);
  73
  74         /* if all 4 packets are IPV4. */
  75         if (likely(ipv4_flag)) {
  76                 rte_lpm_lookupx4(qconf->ipv4_lookup_struct, (xmm_t)dip,
  77                         (uint32_t *)&dst, portid);
  78                 /* get rid of unused upper 16 bit for each dport. */
  79                 dst.x = (xmm_t)vec_packs(dst.x, dst.x);
  80                 *(uint64_t *)dprt = dst.u64[0];
  81         } else {
  82                 dst.x = (xmm_t)dip;
  83                 dprt[0] = lpm_get_dst_port_with_ipv4(qconf, pkt[0],
  84                                                         dst.u32[0], portid);
  85                 dprt[1] = lpm_get_dst_port_with_ipv4(qconf, pkt[1],
  86                                                         dst.u32[1], portid);
  87                 dprt[2] = lpm_get_dst_port_with_ipv4(qconf, pkt[2],
  88                                                         dst.u32[2], portid);
  89                 dprt[3] = lpm_get_dst_port_with_ipv4(qconf, pkt[3],
  90                                                         dst.u32[3], portid);
  91         }
  92 }
  93
  94 /*
  95  * Buffer optimized handling of packets, invoked
  96  * from main_loop.
  97  */
  98 static inline void
  99 l3fwd_lpm_send_packets(int nb_rx, struct rte_mbuf **pkts_burst,
 100                         uint8_t portid, struct lcore_conf *qconf)
 101 {
 102         int32_t j;
 103         uint16_t dst_port[MAX_PKT_BURST];
 104         vector unsigned int dip[MAX_PKT_BURST / FWDSTEP];
 105         uint32_t ipv4_flag[MAX_PKT_BURST / FWDSTEP];
 106         const int32_t k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);
 107
 108         for (j = 0; j != k; j += FWDSTEP)
 109                 processx4_step1(&pkts_burst[j], &dip[j / FWDSTEP],
 110                                 &ipv4_flag[j / FWDSTEP]);
 111
 112         for (j = 0; j != k; j += FWDSTEP)
 113                 processx4_step2(qconf, dip[j / FWDSTEP],
 114                                 ipv4_flag[j / FWDSTEP],
 115                                 portid, &pkts_burst[j], &dst_port[j]);
 116
 117         /* Classify last up to 3 packets one by one */
 118         switch (nb_rx % FWDSTEP) {
 119         case 3:
 120                 dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j], portid);
 121                 j++;
 122                 /* fall-through */
 123         case 2:
 124                 dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j], portid);
 125                 j++;
 126                 /* fall-through */
 127         case 1:
 128                 dst_port[j] = lpm_get_dst_port(qconf, pkts_burst[j], portid);
 129                 j++;
 130                 /* fall-through */
 131         }
 132
 133         send_packets_multi(qconf, pkts_burst, dst_port, nb_rx);
 134 }
 135
 136 #endif /* __L3FWD_LPM_ALTIVEC_H__ */