ceph/src/spdk/dpdk/examples/l3fwd/l3fwd_altivec.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016 Intel Corporation.
   3  * Copyright(c) 2017 IBM Corporation.
   4  * All rights reserved.
   5  */
   6
   7 #ifndef _L3FWD_ALTIVEC_H_
   8 #define _L3FWD_ALTIVEC_H_
   9
  10 #include "l3fwd.h"
  11 #include "l3fwd_common.h"
  12
  13 /*
  14  * Update source and destination MAC addresses in the ethernet header.
  15  * Perform RFC1812 checks and updates for IPV4 packets.
  16  */
  17 static inline void
  18 processx4_step3(struct rte_mbuf *pkt[FWDSTEP], uint16_t dst_port[FWDSTEP])
  19 {
  20         vector unsigned int te[FWDSTEP];
  21         vector unsigned int ve[FWDSTEP];
  22         vector unsigned int *p[FWDSTEP];
  23
  24         p[0] = rte_pktmbuf_mtod(pkt[0], vector unsigned int *);
  25         p[1] = rte_pktmbuf_mtod(pkt[1], vector unsigned int *);
  26         p[2] = rte_pktmbuf_mtod(pkt[2], vector unsigned int *);
  27         p[3] = rte_pktmbuf_mtod(pkt[3], vector unsigned int *);
  28
  29         ve[0] = (vector unsigned int)val_eth[dst_port[0]];
  30         te[0] = *p[0];
  31
  32         ve[1] = (vector unsigned int)val_eth[dst_port[1]];
  33         te[1] = *p[1];
  34
  35         ve[2] = (vector unsigned int)val_eth[dst_port[2]];
  36         te[2] = *p[2];
  37
  38         ve[3] = (vector unsigned int)val_eth[dst_port[3]];
  39         te[3] = *p[3];
  40
  41         /* Update first 12 bytes, keep rest bytes intact. */
  42         te[0] = (vector unsigned int)vec_sel(
  43                         (vector unsigned short)ve[0],
  44                         (vector unsigned short)te[0],
  45                         (vector unsigned short) {0, 0, 0, 0,
  46                                                 0, 0, 0xffff, 0xffff});
  47
  48         te[1] = (vector unsigned int)vec_sel(
  49                         (vector unsigned short)ve[1],
  50                         (vector unsigned short)te[1],
  51                         (vector unsigned short) {0, 0, 0, 0,
  52                                                 0, 0, 0xffff, 0xffff});
  53
  54         te[2] = (vector unsigned int)vec_sel(
  55                         (vector unsigned short)ve[2],
  56                         (vector unsigned short)te[2],
  57                         (vector unsigned short) {0, 0, 0, 0, 0,
  58                                                 0, 0xffff, 0xffff});
  59
  60         te[3] = (vector unsigned int)vec_sel(
  61                         (vector unsigned short)ve[3],
  62                         (vector unsigned short)te[3],
  63                         (vector unsigned short) {0, 0, 0, 0,
  64                                                 0, 0, 0xffff, 0xffff});
  65
  66         *p[0] = te[0];
  67         *p[1] = te[1];
  68         *p[2] = te[2];
  69         *p[3] = te[3];
  70
  71         rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[0] + 1),
  72                 &dst_port[0], pkt[0]->packet_type);
  73         rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[1] + 1),
  74                 &dst_port[1], pkt[1]->packet_type);
  75         rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[2] + 1),
  76                 &dst_port[2], pkt[2]->packet_type);
  77         rfc1812_process((struct ipv4_hdr *)((struct ether_hdr *)p[3] + 1),
  78                 &dst_port[3], pkt[3]->packet_type);
  79 }
  80
  81 /*
  82  * Group consecutive packets with the same destination port in bursts of 4.
  83  * Suppose we have array of destination ports:
  84  * dst_port[] = {a, b, c, d,, e, ... }
  85  * dp1 should contain: <a, b, c, d>, dp2: <b, c, d, e>.
  86  * We doing 4 comparisons at once and the result is 4 bit mask.
  87  * This mask is used as an index into prebuild array of pnum values.
  88  */
  89 static inline uint16_t *
  90 port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, vector unsigned short dp1,
  91         vector unsigned short dp2)
  92 {
  93         union {
  94                 uint16_t u16[FWDSTEP + 1];
  95                 uint64_t u64;
  96         } *pnum = (void *)pn;
  97
  98         int32_t v;
  99
 100         v = vec_any_eq(dp1, dp2);
 101
 102
 103         /* update last port counter. */
 104         lp[0] += gptbl[v].lpv;
 105
 106         /* if dest port value has changed. */
 107         if (v != GRPMSK) {
 108                 pnum->u64 = gptbl[v].pnum;
 109                 pnum->u16[FWDSTEP] = 1;
 110                 lp = pnum->u16 + gptbl[v].idx;
 111         }
 112
 113         return lp;
 114 }
 115
 116 /**
 117  * Process one packet:
 118  * Update source and destination MAC addresses in the ethernet header.
 119  * Perform RFC1812 checks and updates for IPV4 packets.
 120  */
 121 static inline void
 122 process_packet(struct rte_mbuf *pkt, uint16_t *dst_port)
 123 {
 124         struct ether_hdr *eth_hdr;
 125         vector unsigned int te, ve;
 126
 127         eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
 128
 129         te = *(vector unsigned int *)eth_hdr;
 130         ve = (vector unsigned int)val_eth[dst_port[0]];
 131
 132         rfc1812_process((struct ipv4_hdr *)(eth_hdr + 1), dst_port,
 133                         pkt->packet_type);
 134
 135         /* dynamically vec_sel te and ve for MASK_ETH (0x3f) */
 136         te = (vector unsigned int)vec_sel(
 137                 (vector unsigned short)ve,
 138                 (vector unsigned short)te,
 139                 (vector unsigned short){0, 0, 0, 0,
 140                                         0, 0, 0xffff, 0xffff});
 141
 142         *(vector unsigned int *)eth_hdr = te;
 143 }
 144
 145 /**
 146  * Send packets burst from pkts_burst to the ports in dst_port array
 147  */
 148 static __rte_always_inline void
 149 send_packets_multi(struct lcore_conf *qconf, struct rte_mbuf **pkts_burst,
 150                 uint16_t dst_port[MAX_PKT_BURST], int nb_rx)
 151 {
 152         int32_t k;
 153         int j = 0;
 154         uint16_t dlp;
 155         uint16_t *lp;
 156         uint16_t pnum[MAX_PKT_BURST + 1];
 157
 158         /*
 159          * Finish packet processing and group consecutive
 160          * packets with the same destination port.
 161          */
 162         k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);
 163         if (k != 0) {
 164                 vector unsigned short dp1, dp2;
 165
 166                 lp = pnum;
 167                 lp[0] = 1;
 168
 169                 processx4_step3(pkts_burst, dst_port);
 170
 171                 /* dp1: <d[0], d[1], d[2], d[3], ... > */
 172                 dp1 = *(vector unsigned short *)dst_port;
 173
 174                 for (j = FWDSTEP; j != k; j += FWDSTEP) {
 175                         processx4_step3(&pkts_burst[j], &dst_port[j]);
 176
 177                         /*
 178                          * dp2:
 179                          * <d[j-3], d[j-2], d[j-1], d[j], ... >
 180                          */
 181                         dp2 = *((vector unsigned short *)
 182                                         &dst_port[j - FWDSTEP + 1]);
 183                         lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1, dp2);
 184
 185                         /*
 186                          * dp1:
 187                          * <d[j], d[j+1], d[j+2], d[j+3], ... >
 188                          */
 189                         dp1 = vec_sro(dp2, (vector unsigned char) {
 190                                 0, 0, 0, 0, 0, 0, 0, 0,
 191                                 0, 0, 0, (FWDSTEP - 1) * sizeof(dst_port[0])});
 192                 }
 193
 194                 /*
 195                  * dp2: <d[j-3], d[j-2], d[j-1], d[j-1], ... >
 196                  */
 197                 dp2 = vec_perm(dp1, (vector unsigned short){},
 198                                 (vector unsigned char){0xf9});
 199                 lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1, dp2);
 200
 201                 /*
 202                  * remove values added by the last repeated
 203                  * dst port.
 204                  */
 205                 lp[0]--;
 206                 dlp = dst_port[j - 1];
 207         } else {
 208                 /* set dlp and lp to the never used values. */
 209                 dlp = BAD_PORT - 1;
 210                 lp = pnum + MAX_PKT_BURST;
 211         }
 212
 213         /* Process up to last 3 packets one by one. */
 214         switch (nb_rx % FWDSTEP) {
 215         case 3:
 216                 process_packet(pkts_burst[j], dst_port + j);
 217                 GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
 218                 j++;
 219                 /* fall-through */
 220         case 2:
 221                 process_packet(pkts_burst[j], dst_port + j);
 222                 GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
 223                 j++;
 224                 /* fall-through */
 225         case 1:
 226                 process_packet(pkts_burst[j], dst_port + j);
 227                 GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
 228                 j++;
 229         }
 230
 231         /*
 232          * Send packets out, through destination port.
 233          * Consecutive packets with the same destination port
 234          * are already grouped together.
 235          * If destination port for the packet equals BAD_PORT,
 236          * then free the packet without sending it out.
 237          */
 238         for (j = 0; j < nb_rx; j += k) {
 239
 240                 int32_t m;
 241                 uint16_t pn;
 242
 243                 pn = dst_port[j];
 244                 k = pnum[j];
 245
 246                 if (likely(pn != BAD_PORT))
 247                         send_packetsx4(qconf, pn, pkts_burst + j, k);
 248                 else
 249                         for (m = j; m != j + k; m++)
 250                                 rte_pktmbuf_free(pkts_burst[m]);
 251
 252         }
 253 }
 254
 255 #endif /* _L3FWD_ALTIVEC_H_ */