lib/node/ip4_lookup_neon.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(C) 2020 Marvell International Ltd.
   3  */
   4
   5 #ifndef __INCLUDE_IP4_LOOKUP_NEON_H__
   6 #define __INCLUDE_IP4_LOOKUP_NEON_H__
   7
   8 /* ARM64 NEON */
   9 static uint16_t
  10 ip4_lookup_node_process_vec(struct rte_graph *graph, struct rte_node *node,
  11                         void **objs, uint16_t nb_objs)
  12 {
  13         struct rte_mbuf *mbuf0, *mbuf1, *mbuf2, *mbuf3, **pkts;
  14         struct rte_lpm *lpm = IP4_LOOKUP_NODE_LPM(node->ctx);
  15         const int dyn = IP4_LOOKUP_NODE_PRIV1_OFF(node->ctx);
  16         struct rte_ipv4_hdr *ipv4_hdr;
  17         void **to_next, **from;
  18         uint16_t last_spec = 0;
  19         rte_edge_t next_index;
  20         uint16_t n_left_from;
  21         uint16_t held = 0;
  22         uint32_t drop_nh;
  23         rte_xmm_t result;
  24         rte_xmm_t priv01;
  25         rte_xmm_t priv23;
  26         int32x4_t dip;
  27         int rc, i;
  28
  29         /* Speculative next */
  30         next_index = RTE_NODE_IP4_LOOKUP_NEXT_REWRITE;
  31         /* Drop node */
  32         drop_nh = ((uint32_t)RTE_NODE_IP4_LOOKUP_NEXT_PKT_DROP) << 16;
  33
  34         pkts = (struct rte_mbuf **)objs;
  35         from = objs;
  36         n_left_from = nb_objs;
  37
  38         for (i = OBJS_PER_CLINE; i < RTE_GRAPH_BURST_SIZE; i += OBJS_PER_CLINE)
  39                 rte_prefetch0(&objs[i]);
  40
  41         for (i = 0; i < 4 && i < n_left_from; i++)
  42                 rte_prefetch0(rte_pktmbuf_mtod_offset(pkts[i], void *,
  43                                                 sizeof(struct rte_ether_hdr)));
  44
  45         dip = vdupq_n_s32(0);
  46         /* Get stream for the speculated next node */
  47         to_next = rte_node_next_stream_get(graph, node, next_index, nb_objs);
  48         while (n_left_from >= 4) {
  49 #if RTE_GRAPH_BURST_SIZE > 64
  50                 /* Prefetch next-next mbufs */
  51                 if (likely(n_left_from > 11)) {
  52                         rte_prefetch0(pkts[8]);
  53                         rte_prefetch0(pkts[9]);
  54                         rte_prefetch0(pkts[10]);
  55                         rte_prefetch0(pkts[11]);
  56                 }
  57 #endif
  58                 /* Prefetch next mbuf data */
  59                 if (likely(n_left_from > 7)) {
  60                         rte_prefetch0(rte_pktmbuf_mtod_offset(pkts[4], void *,
  61                                                 sizeof(struct rte_ether_hdr)));
  62                         rte_prefetch0(rte_pktmbuf_mtod_offset(pkts[5], void *,
  63                                                 sizeof(struct rte_ether_hdr)));
  64                         rte_prefetch0(rte_pktmbuf_mtod_offset(pkts[6], void *,
  65                                                 sizeof(struct rte_ether_hdr)));
  66                         rte_prefetch0(rte_pktmbuf_mtod_offset(pkts[7], void *,
  67                                                 sizeof(struct rte_ether_hdr)));
  68                 }
  69
  70                 mbuf0 = pkts[0];
  71                 mbuf1 = pkts[1];
  72                 mbuf2 = pkts[2];
  73                 mbuf3 = pkts[3];
  74
  75                 pkts += 4;
  76                 n_left_from -= 4;
  77
  78                 /* Extract DIP of mbuf0 */
  79                 ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf0, struct rte_ipv4_hdr *,
  80                                                 sizeof(struct rte_ether_hdr));
  81                 dip = vsetq_lane_s32(ipv4_hdr->dst_addr, dip, 0);
  82                 /* Extract cksum, ttl as ipv4 hdr is in cache */
  83                 priv01.u16[1] = ipv4_hdr->time_to_live;
  84                 priv01.u32[1] = ipv4_hdr->hdr_checksum;
  85
  86                 /* Extract DIP of mbuf1 */
  87                 ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf1, struct rte_ipv4_hdr *,
  88                                                 sizeof(struct rte_ether_hdr));
  89                 dip = vsetq_lane_s32(ipv4_hdr->dst_addr, dip, 1);
  90                 /* Extract cksum, ttl as ipv4 hdr is in cache */
  91                 priv01.u16[5] = ipv4_hdr->time_to_live;
  92                 priv01.u32[3] = ipv4_hdr->hdr_checksum;
  93
  94                 /* Extract DIP of mbuf2 */
  95                 ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf2, struct rte_ipv4_hdr *,
  96                                                 sizeof(struct rte_ether_hdr));
  97                 dip = vsetq_lane_s32(ipv4_hdr->dst_addr, dip, 2);
  98                 /* Extract cksum, ttl as ipv4 hdr is in cache */
  99                 priv23.u16[1] = ipv4_hdr->time_to_live;
 100                 priv23.u32[1] = ipv4_hdr->hdr_checksum;
 101
 102                 /* Extract DIP of mbuf3 */
 103                 ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf3, struct rte_ipv4_hdr *,
 104                                                 sizeof(struct rte_ether_hdr));
 105                 dip = vsetq_lane_s32(ipv4_hdr->dst_addr, dip, 3);
 106
 107                 dip = vreinterpretq_s32_u8(
 108                         vrev32q_u8(vreinterpretq_u8_s32(dip)));
 109                 /* Extract cksum, ttl as ipv4 hdr is in cache */
 110                 priv23.u16[5] = ipv4_hdr->time_to_live;
 111                 priv23.u32[3] = ipv4_hdr->hdr_checksum;
 112
 113                 /* Perform LPM lookup to get NH and next node */
 114                 rte_lpm_lookupx4(lpm, dip, result.u32, drop_nh);
 115                 priv01.u16[0] = result.u16[0];
 116                 priv01.u16[4] = result.u16[2];
 117                 priv23.u16[0] = result.u16[4];
 118                 priv23.u16[4] = result.u16[6];
 119
 120                 node_mbuf_priv1(mbuf0, dyn)->u = priv01.u64[0];
 121                 node_mbuf_priv1(mbuf1, dyn)->u = priv01.u64[1];
 122                 node_mbuf_priv1(mbuf2, dyn)->u = priv23.u64[0];
 123                 node_mbuf_priv1(mbuf3, dyn)->u = priv23.u64[1];
 124
 125                 /* Enqueue four to next node */
 126                 rte_edge_t fix_spec = ((next_index == result.u16[1]) &&
 127                                        (result.u16[1] == result.u16[3]) &&
 128                                        (result.u16[3] == result.u16[5]) &&
 129                                        (result.u16[5] == result.u16[7]));
 130
 131                 if (unlikely(fix_spec == 0)) {
 132                         /* Copy things successfully speculated till now */
 133                         rte_memcpy(to_next, from, last_spec * sizeof(from[0]));
 134                         from += last_spec;
 135                         to_next += last_spec;
 136                         held += last_spec;
 137                         last_spec = 0;
 138
 139                         /* Next0 */
 140                         if (next_index == result.u16[1]) {
 141                                 to_next[0] = from[0];
 142                                 to_next++;
 143                                 held++;
 144                         } else {
 145                                 rte_node_enqueue_x1(graph, node, result.u16[1],
 146                                                     from[0]);
 147                         }
 148
 149                         /* Next1 */
 150                         if (next_index == result.u16[3]) {
 151                                 to_next[0] = from[1];
 152                                 to_next++;
 153                                 held++;
 154                         } else {
 155                                 rte_node_enqueue_x1(graph, node, result.u16[3],
 156                                                     from[1]);
 157                         }
 158
 159                         /* Next2 */
 160                         if (next_index == result.u16[5]) {
 161                                 to_next[0] = from[2];
 162                                 to_next++;
 163                                 held++;
 164                         } else {
 165                                 rte_node_enqueue_x1(graph, node, result.u16[5],
 166                                                     from[2]);
 167                         }
 168
 169                         /* Next3 */
 170                         if (next_index == result.u16[7]) {
 171                                 to_next[0] = from[3];
 172                                 to_next++;
 173                                 held++;
 174                         } else {
 175                                 rte_node_enqueue_x1(graph, node, result.u16[7],
 176                                                     from[3]);
 177                         }
 178
 179                         from += 4;
 180                 } else {
 181                         last_spec += 4;
 182                 }
 183         }
 184
 185         while (n_left_from > 0) {
 186                 uint32_t next_hop;
 187                 uint16_t next0;
 188
 189                 mbuf0 = pkts[0];
 190
 191                 pkts += 1;
 192                 n_left_from -= 1;
 193
 194                 /* Extract DIP of mbuf0 */
 195                 ipv4_hdr = rte_pktmbuf_mtod_offset(mbuf0, struct rte_ipv4_hdr *,
 196                                                 sizeof(struct rte_ether_hdr));
 197                 /* Extract cksum, ttl as ipv4 hdr is in cache */
 198                 node_mbuf_priv1(mbuf0, dyn)->cksum = ipv4_hdr->hdr_checksum;
 199                 node_mbuf_priv1(mbuf0, dyn)->ttl = ipv4_hdr->time_to_live;
 200
 201                 rc = rte_lpm_lookup(lpm, rte_be_to_cpu_32(ipv4_hdr->dst_addr),
 202                                     &next_hop);
 203                 next_hop = (rc == 0) ? next_hop : drop_nh;
 204
 205                 node_mbuf_priv1(mbuf0, dyn)->nh = (uint16_t)next_hop;
 206                 next_hop = next_hop >> 16;
 207                 next0 = (uint16_t)next_hop;
 208
 209                 if (unlikely(next_index ^ next0)) {
 210                         /* Copy things successfully speculated till now */
 211                         rte_memcpy(to_next, from, last_spec * sizeof(from[0]));
 212                         from += last_spec;
 213                         to_next += last_spec;
 214                         held += last_spec;
 215                         last_spec = 0;
 216
 217                         rte_node_enqueue_x1(graph, node, next0, from[0]);
 218                         from += 1;
 219                 } else {
 220                         last_spec += 1;
 221                 }
 222         }
 223
 224         /* !!! Home run !!! */
 225         if (likely(last_spec == nb_objs)) {
 226                 rte_node_next_stream_move(graph, node, next_index);
 227                 return nb_objs;
 228         }
 229         held += last_spec;
 230         rte_memcpy(to_next, from, last_spec * sizeof(from[0]));
 231         rte_node_next_stream_put(graph, node, next_index, held);
 232
 233         return nb_objs;
 234 }
 235
 236 #endif /* __INCLUDE_IP4_LOOKUP_NEON_H__ */