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 rte_ipv4_hdr *)
  72                         ((struct rte_ether_hdr *)p[0] + 1),
  73                         &dst_port[0], pkt[0]->packet_type);
  74         rfc1812_process((struct rte_ipv4_hdr *)
  75                         ((struct rte_ether_hdr *)p[1] + 1),
  76                         &dst_port[1], pkt[1]->packet_type);
  77         rfc1812_process((struct rte_ipv4_hdr *)
  78                         ((struct rte_ether_hdr *)p[2] + 1),
  79                         &dst_port[2], pkt[2]->packet_type);
  80         rfc1812_process((struct rte_ipv4_hdr *)
  81                         ((struct rte_ether_hdr *)p[3] + 1),
  82                         &dst_port[3], pkt[3]->packet_type);
  83 }
  84
  85 /*
  86  * Group consecutive packets with the same destination port in bursts of 4.
  87  * Suppose we have array of destination ports:
  88  * dst_port[] = {a, b, c, d,, e, ... }
  89  * dp1 should contain: <a, b, c, d>, dp2: <b, c, d, e>.
  90  * We doing 4 comparisons at once and the result is 4 bit mask.
  91  * This mask is used as an index into prebuild array of pnum values.
  92  */
  93 static inline uint16_t *
  94 port_groupx4(uint16_t pn[FWDSTEP + 1], uint16_t *lp, vector unsigned short dp1,
  95         vector unsigned short dp2)
  96 {
  97         union {
  98                 uint16_t u16[FWDSTEP + 1];
  99                 uint64_t u64;
 100         } *pnum = (void *)pn;
 101
 102         int32_t v;
 103
 104         v = vec_any_eq(dp1, dp2);
 105
 106
 107         /* update last port counter. */
 108         lp[0] += gptbl[v].lpv;
 109
 110         /* if dest port value has changed. */
 111         if (v != GRPMSK) {
 112                 pnum->u64 = gptbl[v].pnum;
 113                 pnum->u16[FWDSTEP] = 1;
 114                 lp = pnum->u16 + gptbl[v].idx;
 115         }
 116
 117         return lp;
 118 }
 119
 120 /**
 121  * Process one packet:
 122  * Update source and destination MAC addresses in the ethernet header.
 123  * Perform RFC1812 checks and updates for IPV4 packets.
 124  */
 125 static inline void
 126 process_packet(struct rte_mbuf *pkt, uint16_t *dst_port)
 127 {
 128         struct rte_ether_hdr *eth_hdr;
 129         vector unsigned int te, ve;
 130
 131         eth_hdr = rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
 132
 133         te = *(vector unsigned int *)eth_hdr;
 134         ve = (vector unsigned int)val_eth[dst_port[0]];
 135
 136         rfc1812_process((struct rte_ipv4_hdr *)(eth_hdr + 1), dst_port,
 137                         pkt->packet_type);
 138
 139         /* dynamically vec_sel te and ve for MASK_ETH (0x3f) */
 140         te = (vector unsigned int)vec_sel(
 141                 (vector unsigned short)ve,
 142                 (vector unsigned short)te,
 143                 (vector unsigned short){0, 0, 0, 0,
 144                                         0, 0, 0xffff, 0xffff});
 145
 146         *(vector unsigned int *)eth_hdr = te;
 147 }
 148
 149 /**
 150  * Send packets burst from pkts_burst to the ports in dst_port array
 151  */
 152 static __rte_always_inline void
 153 send_packets_multi(struct lcore_conf *qconf, struct rte_mbuf **pkts_burst,
 154                 uint16_t dst_port[MAX_PKT_BURST], int nb_rx)
 155 {
 156         int32_t k;
 157         int j = 0;
 158         uint16_t dlp;
 159         uint16_t *lp;
 160         uint16_t pnum[MAX_PKT_BURST + 1];
 161
 162         /*
 163          * Finish packet processing and group consecutive
 164          * packets with the same destination port.
 165          */
 166         k = RTE_ALIGN_FLOOR(nb_rx, FWDSTEP);
 167         if (k != 0) {
 168                 vector unsigned short dp1, dp2;
 169
 170                 lp = pnum;
 171                 lp[0] = 1;
 172
 173                 processx4_step3(pkts_burst, dst_port);
 174
 175                 /* dp1: <d[0], d[1], d[2], d[3], ... > */
 176                 dp1 = *(vector unsigned short *)dst_port;
 177
 178                 for (j = FWDSTEP; j != k; j += FWDSTEP) {
 179                         processx4_step3(&pkts_burst[j], &dst_port[j]);
 180
 181                         /*
 182                          * dp2:
 183                          * <d[j-3], d[j-2], d[j-1], d[j], ... >
 184                          */
 185                         dp2 = *((vector unsigned short *)
 186                                         &dst_port[j - FWDSTEP + 1]);
 187                         lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1, dp2);
 188
 189                         /*
 190                          * dp1:
 191                          * <d[j], d[j+1], d[j+2], d[j+3], ... >
 192                          */
 193                         dp1 = vec_sro(dp2, (vector unsigned char) {
 194                                 0, 0, 0, 0, 0, 0, 0, 0,
 195                                 0, 0, 0, (FWDSTEP - 1) * sizeof(dst_port[0])});
 196                 }
 197
 198                 /*
 199                  * dp2: <d[j-3], d[j-2], d[j-1], d[j-1], ... >
 200                  */
 201                 dp2 = vec_perm(dp1, (vector unsigned short){},
 202                                 (vector unsigned char){0xf9});
 203                 lp  = port_groupx4(&pnum[j - FWDSTEP], lp, dp1, dp2);
 204
 205                 /*
 206                  * remove values added by the last repeated
 207                  * dst port.
 208                  */
 209                 lp[0]--;
 210                 dlp = dst_port[j - 1];
 211         } else {
 212                 /* set dlp and lp to the never used values. */
 213                 dlp = BAD_PORT - 1;
 214                 lp = pnum + MAX_PKT_BURST;
 215         }
 216
 217         /* Process up to last 3 packets one by one. */
 218         switch (nb_rx % FWDSTEP) {
 219         case 3:
 220                 process_packet(pkts_burst[j], dst_port + j);
 221                 GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
 222                 j++;
 223                 /* fall-through */
 224         case 2:
 225                 process_packet(pkts_burst[j], dst_port + j);
 226                 GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
 227                 j++;
 228                 /* fall-through */
 229         case 1:
 230                 process_packet(pkts_burst[j], dst_port + j);
 231                 GROUP_PORT_STEP(dlp, dst_port, lp, pnum, j);
 232                 j++;
 233         }
 234
 235         /*
 236          * Send packets out, through destination port.
 237          * Consecutive packets with the same destination port
 238          * are already grouped together.
 239          * If destination port for the packet equals BAD_PORT,
 240          * then free the packet without sending it out.
 241          */
 242         for (j = 0; j < nb_rx; j += k) {
 243
 244                 int32_t m;
 245                 uint16_t pn;
 246
 247                 pn = dst_port[j];
 248                 k = pnum[j];
 249
 250                 if (likely(pn != BAD_PORT))
 251                         send_packetsx4(qconf, pn, pkts_burst + j, k);
 252                 else
 253                         for (m = j; m != j + k; m++)
 254                                 rte_pktmbuf_free(pkts_burst[m]);
 255
 256         }
 257 }
 258
 259 #endif /* _L3FWD_ALTIVEC_H_ */