drivers/net/enic/enic_rxtx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2008-2017 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  */
   5
   6 #include <rte_mbuf.h>
   7 #include <rte_ethdev_driver.h>
   8 #include <rte_net.h>
   9 #include <rte_prefetch.h>
  10
  11 #include "enic_compat.h"
  12 #include "rq_enet_desc.h"
  13 #include "enic.h"
  14 #include <rte_ether.h>
  15 #include <rte_ip.h>
  16 #include <rte_tcp.h>
  17
  18 #define RTE_PMD_USE_PREFETCH
  19
  20 #ifdef RTE_PMD_USE_PREFETCH
  21 /*Prefetch a cache line into all cache levels. */
  22 #define rte_enic_prefetch(p) rte_prefetch0(p)
  23 #else
  24 #define rte_enic_prefetch(p) do {} while (0)
  25 #endif
  26
  27 #ifdef RTE_PMD_PACKET_PREFETCH
  28 #define rte_packet_prefetch(p) rte_prefetch1(p)
  29 #else
  30 #define rte_packet_prefetch(p) do {} while (0)
  31 #endif
  32
  33 static inline uint16_t
  34 enic_cq_rx_desc_ciflags(struct cq_enet_rq_desc *crd)
  35 {
  36         return le16_to_cpu(crd->completed_index_flags) & ~CQ_DESC_COMP_NDX_MASK;
  37 }
  38
  39 static inline uint16_t
  40 enic_cq_rx_desc_bwflags(struct cq_enet_rq_desc *crd)
  41 {
  42         return le16_to_cpu(crd->bytes_written_flags) &
  43                            ~CQ_ENET_RQ_DESC_BYTES_WRITTEN_MASK;
  44 }
  45
  46 static inline uint8_t
  47 enic_cq_rx_desc_packet_error(uint16_t bwflags)
  48 {
  49         return (bwflags & CQ_ENET_RQ_DESC_FLAGS_TRUNCATED) ==
  50                 CQ_ENET_RQ_DESC_FLAGS_TRUNCATED;
  51 }
  52
  53 static inline uint8_t
  54 enic_cq_rx_desc_eop(uint16_t ciflags)
  55 {
  56         return (ciflags & CQ_ENET_RQ_DESC_FLAGS_EOP)
  57                 == CQ_ENET_RQ_DESC_FLAGS_EOP;
  58 }
  59
  60 static inline uint8_t
  61 enic_cq_rx_desc_csum_not_calc(struct cq_enet_rq_desc *cqrd)
  62 {
  63         return (le16_to_cpu(cqrd->q_number_rss_type_flags) &
  64                 CQ_ENET_RQ_DESC_FLAGS_CSUM_NOT_CALC) ==
  65                 CQ_ENET_RQ_DESC_FLAGS_CSUM_NOT_CALC;
  66 }
  67
  68 static inline uint8_t
  69 enic_cq_rx_desc_ipv4_csum_ok(struct cq_enet_rq_desc *cqrd)
  70 {
  71         return (cqrd->flags & CQ_ENET_RQ_DESC_FLAGS_IPV4_CSUM_OK) ==
  72                 CQ_ENET_RQ_DESC_FLAGS_IPV4_CSUM_OK;
  73 }
  74
  75 static inline uint8_t
  76 enic_cq_rx_desc_tcp_udp_csum_ok(struct cq_enet_rq_desc *cqrd)
  77 {
  78         return (cqrd->flags & CQ_ENET_RQ_DESC_FLAGS_TCP_UDP_CSUM_OK) ==
  79                 CQ_ENET_RQ_DESC_FLAGS_TCP_UDP_CSUM_OK;
  80 }
  81
  82 static inline uint8_t
  83 enic_cq_rx_desc_rss_type(struct cq_enet_rq_desc *cqrd)
  84 {
  85         return (uint8_t)((le16_to_cpu(cqrd->q_number_rss_type_flags) >>
  86                 CQ_DESC_Q_NUM_BITS) & CQ_ENET_RQ_DESC_RSS_TYPE_MASK);
  87 }
  88
  89 static inline uint32_t
  90 enic_cq_rx_desc_rss_hash(struct cq_enet_rq_desc *cqrd)
  91 {
  92         return le32_to_cpu(cqrd->rss_hash);
  93 }
  94
  95 static inline uint16_t
  96 enic_cq_rx_desc_vlan(struct cq_enet_rq_desc *cqrd)
  97 {
  98         return le16_to_cpu(cqrd->vlan);
  99 }
 100
 101 static inline uint16_t
 102 enic_cq_rx_desc_n_bytes(struct cq_desc *cqd)
 103 {
 104         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 105         return le16_to_cpu(cqrd->bytes_written_flags) &
 106                 CQ_ENET_RQ_DESC_BYTES_WRITTEN_MASK;
 107 }
 108
 109
 110 static inline uint8_t
 111 enic_cq_rx_check_err(struct cq_desc *cqd)
 112 {
 113         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 114         uint16_t bwflags;
 115
 116         bwflags = enic_cq_rx_desc_bwflags(cqrd);
 117         if (unlikely(enic_cq_rx_desc_packet_error(bwflags)))
 118                 return 1;
 119         return 0;
 120 }
 121
 122 /* Lookup table to translate RX CQ flags to mbuf flags. */
 123 static inline uint32_t
 124 enic_cq_rx_flags_to_pkt_type(struct cq_desc *cqd, uint8_t tnl)
 125 {
 126         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 127         uint8_t cqrd_flags = cqrd->flags;
 128         /*
 129          * Odd-numbered entries are for tunnel packets. All packet type info
 130          * applies to the inner packet, and there is no info on the outer
 131          * packet. The outer flags in these entries exist only to avoid
 132          * changing enic_cq_rx_to_pkt_flags(). They are cleared from mbuf
 133          * afterwards.
 134          *
 135          * Also, as there is no tunnel type info (VXLAN, NVGRE, or GENEVE), set
 136          * RTE_PTYPE_TUNNEL_GRENAT..
 137          */
 138         static const uint32_t cq_type_table[128] __rte_cache_aligned = {
 139                 [0x00] = RTE_PTYPE_UNKNOWN,
 140                 [0x01] = RTE_PTYPE_UNKNOWN |
 141                          RTE_PTYPE_TUNNEL_GRENAT |
 142                          RTE_PTYPE_INNER_L2_ETHER,
 143                 [0x20] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_NONFRAG,
 144                 [0x21] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_NONFRAG |
 145                          RTE_PTYPE_TUNNEL_GRENAT |
 146                          RTE_PTYPE_INNER_L2_ETHER |
 147                          RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN |
 148                          RTE_PTYPE_INNER_L4_NONFRAG,
 149                 [0x22] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_UDP,
 150                 [0x23] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_UDP |
 151                          RTE_PTYPE_TUNNEL_GRENAT |
 152                          RTE_PTYPE_INNER_L2_ETHER |
 153                          RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN |
 154                          RTE_PTYPE_INNER_L4_UDP,
 155                 [0x24] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_TCP,
 156                 [0x25] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_TCP |
 157                          RTE_PTYPE_TUNNEL_GRENAT |
 158                          RTE_PTYPE_INNER_L2_ETHER |
 159                          RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN |
 160                          RTE_PTYPE_INNER_L4_TCP,
 161                 [0x60] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG,
 162                 [0x61] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG |
 163                          RTE_PTYPE_TUNNEL_GRENAT |
 164                          RTE_PTYPE_INNER_L2_ETHER |
 165                          RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN |
 166                          RTE_PTYPE_INNER_L4_FRAG,
 167                 [0x62] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG,
 168                 [0x63] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG |
 169                          RTE_PTYPE_TUNNEL_GRENAT |
 170                          RTE_PTYPE_INNER_L2_ETHER |
 171                          RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN |
 172                          RTE_PTYPE_INNER_L4_FRAG,
 173                 [0x64] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG,
 174                 [0x65] = RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG |
 175                          RTE_PTYPE_TUNNEL_GRENAT |
 176                          RTE_PTYPE_INNER_L2_ETHER |
 177                          RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN |
 178                          RTE_PTYPE_INNER_L4_FRAG,
 179                 [0x10] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_NONFRAG,
 180                 [0x11] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_NONFRAG |
 181                          RTE_PTYPE_TUNNEL_GRENAT |
 182                          RTE_PTYPE_INNER_L2_ETHER |
 183                          RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
 184                          RTE_PTYPE_INNER_L4_NONFRAG,
 185                 [0x12] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_UDP,
 186                 [0x13] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_UDP |
 187                          RTE_PTYPE_TUNNEL_GRENAT |
 188                          RTE_PTYPE_INNER_L2_ETHER |
 189                          RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
 190                          RTE_PTYPE_INNER_L4_UDP,
 191                 [0x14] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_TCP,
 192                 [0x15] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_TCP |
 193                          RTE_PTYPE_TUNNEL_GRENAT |
 194                          RTE_PTYPE_INNER_L2_ETHER |
 195                          RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
 196                          RTE_PTYPE_INNER_L4_TCP,
 197                 [0x50] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG,
 198                 [0x51] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG |
 199                          RTE_PTYPE_TUNNEL_GRENAT |
 200                          RTE_PTYPE_INNER_L2_ETHER |
 201                          RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
 202                          RTE_PTYPE_INNER_L4_FRAG,
 203                 [0x52] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG,
 204                 [0x53] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG |
 205                          RTE_PTYPE_TUNNEL_GRENAT |
 206                          RTE_PTYPE_INNER_L2_ETHER |
 207                          RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
 208                          RTE_PTYPE_INNER_L4_FRAG,
 209                 [0x54] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG,
 210                 [0x55] = RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_FRAG |
 211                          RTE_PTYPE_TUNNEL_GRENAT |
 212                          RTE_PTYPE_INNER_L2_ETHER |
 213                          RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN |
 214                          RTE_PTYPE_INNER_L4_FRAG,
 215                 /* All others reserved */
 216         };
 217         cqrd_flags &= CQ_ENET_RQ_DESC_FLAGS_IPV4_FRAGMENT
 218                 | CQ_ENET_RQ_DESC_FLAGS_IPV4 | CQ_ENET_RQ_DESC_FLAGS_IPV6
 219                 | CQ_ENET_RQ_DESC_FLAGS_TCP | CQ_ENET_RQ_DESC_FLAGS_UDP;
 220         return cq_type_table[cqrd_flags + tnl];
 221 }
 222
 223 static inline void
 224 enic_cq_rx_to_pkt_flags(struct cq_desc *cqd, struct rte_mbuf *mbuf)
 225 {
 226         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 227         uint16_t bwflags, pkt_flags = 0, vlan_tci;
 228         bwflags = enic_cq_rx_desc_bwflags(cqrd);
 229         vlan_tci = enic_cq_rx_desc_vlan(cqrd);
 230
 231         /* VLAN STRIPPED flag. The L2 packet type updated here also */
 232         if (bwflags & CQ_ENET_RQ_DESC_FLAGS_VLAN_STRIPPED) {
 233                 pkt_flags |= PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED;
 234                 mbuf->packet_type |= RTE_PTYPE_L2_ETHER;
 235         } else {
 236                 if (vlan_tci != 0)
 237                         mbuf->packet_type |= RTE_PTYPE_L2_ETHER_VLAN;
 238                 else
 239                         mbuf->packet_type |= RTE_PTYPE_L2_ETHER;
 240         }
 241         mbuf->vlan_tci = vlan_tci;
 242
 243         if ((cqd->type_color & CQ_DESC_TYPE_MASK) == CQ_DESC_TYPE_CLASSIFIER) {
 244                 struct cq_enet_rq_clsf_desc *clsf_cqd;
 245                 uint16_t filter_id;
 246                 clsf_cqd = (struct cq_enet_rq_clsf_desc *)cqd;
 247                 filter_id = clsf_cqd->filter_id;
 248                 if (filter_id) {
 249                         pkt_flags |= PKT_RX_FDIR;
 250                         if (filter_id != ENIC_MAGIC_FILTER_ID) {
 251                                 mbuf->hash.fdir.hi = clsf_cqd->filter_id;
 252                                 pkt_flags |= PKT_RX_FDIR_ID;
 253                         }
 254                 }
 255         } else if (enic_cq_rx_desc_rss_type(cqrd)) {
 256                 /* RSS flag */
 257                 pkt_flags |= PKT_RX_RSS_HASH;
 258                 mbuf->hash.rss = enic_cq_rx_desc_rss_hash(cqrd);
 259         }
 260
 261         /* checksum flags */
 262         if (mbuf->packet_type & (RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L3_IPV6)) {
 263                 if (!enic_cq_rx_desc_csum_not_calc(cqrd)) {
 264                         uint32_t l4_flags;
 265                         l4_flags = mbuf->packet_type & RTE_PTYPE_L4_MASK;
 266
 267                         /*
 268                          * When overlay offload is enabled, the NIC may
 269                          * set ipv4_csum_ok=1 if the inner packet is IPv6..
 270                          * So, explicitly check for IPv4 before checking
 271                          * ipv4_csum_ok.
 272                          */
 273                         if (mbuf->packet_type & RTE_PTYPE_L3_IPV4) {
 274                                 if (enic_cq_rx_desc_ipv4_csum_ok(cqrd))
 275                                         pkt_flags |= PKT_RX_IP_CKSUM_GOOD;
 276                                 else
 277                                         pkt_flags |= PKT_RX_IP_CKSUM_BAD;
 278                         }
 279
 280                         if (l4_flags == RTE_PTYPE_L4_UDP ||
 281                             l4_flags == RTE_PTYPE_L4_TCP) {
 282                                 if (enic_cq_rx_desc_tcp_udp_csum_ok(cqrd))
 283                                         pkt_flags |= PKT_RX_L4_CKSUM_GOOD;
 284                                 else
 285                                         pkt_flags |= PKT_RX_L4_CKSUM_BAD;
 286                         }
 287                 }
 288         }
 289
 290         mbuf->ol_flags = pkt_flags;
 291 }
 292
 293 /* dummy receive function to replace actual function in
 294  * order to do safe reconfiguration operations.
 295  */
 296 uint16_t
 297 enic_dummy_recv_pkts(__rte_unused void *rx_queue,
 298                      __rte_unused struct rte_mbuf **rx_pkts,
 299                      __rte_unused uint16_t nb_pkts)
 300 {
 301         return 0;
 302 }
 303
 304 uint16_t
 305 enic_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 306                uint16_t nb_pkts)
 307 {
 308         struct vnic_rq *sop_rq = rx_queue;
 309         struct vnic_rq *data_rq;
 310         struct vnic_rq *rq;
 311         struct enic *enic = vnic_dev_priv(sop_rq->vdev);
 312         uint16_t cq_idx;
 313         uint16_t rq_idx;
 314         uint16_t rq_num;
 315         struct rte_mbuf *nmb, *rxmb;
 316         uint16_t nb_rx = 0;
 317         struct vnic_cq *cq;
 318         volatile struct cq_desc *cqd_ptr;
 319         uint8_t color;
 320         uint8_t tnl;
 321         uint16_t seg_length;
 322         struct rte_mbuf *first_seg = sop_rq->pkt_first_seg;
 323         struct rte_mbuf *last_seg = sop_rq->pkt_last_seg;
 324
 325         cq = &enic->cq[enic_cq_rq(enic, sop_rq->index)];
 326         cq_idx = cq->to_clean;          /* index of cqd, rqd, mbuf_table */
 327         cqd_ptr = (struct cq_desc *)(cq->ring.descs) + cq_idx;
 328
 329         data_rq = &enic->rq[sop_rq->data_queue_idx];
 330
 331         while (nb_rx < nb_pkts) {
 332                 volatile struct rq_enet_desc *rqd_ptr;
 333                 struct cq_desc cqd;
 334                 uint8_t packet_error;
 335                 uint16_t ciflags;
 336
 337                 /* Check for pkts available */
 338                 color = (cqd_ptr->type_color >> CQ_DESC_COLOR_SHIFT)
 339                         & CQ_DESC_COLOR_MASK;
 340                 if (color == cq->last_color)
 341                         break;
 342
 343                 /* Get the cq descriptor and extract rq info from it */
 344                 cqd = *cqd_ptr;
 345                 rq_num = cqd.q_number & CQ_DESC_Q_NUM_MASK;
 346                 rq_idx = cqd.completed_index & CQ_DESC_COMP_NDX_MASK;
 347
 348                 rq = &enic->rq[rq_num];
 349                 rqd_ptr = ((struct rq_enet_desc *)rq->ring.descs) + rq_idx;
 350
 351                 /* allocate a new mbuf */
 352                 nmb = rte_mbuf_raw_alloc(rq->mp);
 353                 if (nmb == NULL) {
 354                         rte_atomic64_inc(&enic->soft_stats.rx_nombuf);
 355                         break;
 356                 }
 357
 358                 /* A packet error means descriptor and data are untrusted */
 359                 packet_error = enic_cq_rx_check_err(&cqd);
 360
 361                 /* Get the mbuf to return and replace with one just allocated */
 362                 rxmb = rq->mbuf_ring[rq_idx];
 363                 rq->mbuf_ring[rq_idx] = nmb;
 364
 365                 /* Increment cqd, rqd, mbuf_table index */
 366                 cq_idx++;
 367                 if (unlikely(cq_idx == cq->ring.desc_count)) {
 368                         cq_idx = 0;
 369                         cq->last_color = cq->last_color ? 0 : 1;
 370                 }
 371
 372                 /* Prefetch next mbuf & desc while processing current one */
 373                 cqd_ptr = (struct cq_desc *)(cq->ring.descs) + cq_idx;
 374                 rte_enic_prefetch(cqd_ptr);
 375
 376                 ciflags = enic_cq_rx_desc_ciflags(
 377                         (struct cq_enet_rq_desc *)&cqd);
 378
 379                 /* Push descriptor for newly allocated mbuf */
 380                 nmb->data_off = RTE_PKTMBUF_HEADROOM;
 381                 /*
 382                  * Only the address needs to be refilled. length_type of the
 383                  * descriptor it set during initialization
 384                  * (enic_alloc_rx_queue_mbufs) and does not change.
 385                  */
 386                 rqd_ptr->address = rte_cpu_to_le_64(nmb->buf_iova +
 387                                                     RTE_PKTMBUF_HEADROOM);
 388
 389                 /* Fill in the rest of the mbuf */
 390                 seg_length = enic_cq_rx_desc_n_bytes(&cqd);
 391
 392                 if (rq->is_sop) {
 393                         first_seg = rxmb;
 394                         first_seg->pkt_len = seg_length;
 395                 } else {
 396                         first_seg->pkt_len = (uint16_t)(first_seg->pkt_len
 397                                                         + seg_length);
 398                         first_seg->nb_segs++;
 399                         last_seg->next = rxmb;
 400                 }
 401
 402                 rxmb->port = enic->port_id;
 403                 rxmb->data_len = seg_length;
 404
 405                 rq->rx_nb_hold++;
 406
 407                 if (!(enic_cq_rx_desc_eop(ciflags))) {
 408                         last_seg = rxmb;
 409                         continue;
 410                 }
 411
 412                 /*
 413                  * When overlay offload is enabled, CQ.fcoe indicates the
 414                  * packet is tunnelled.
 415                  */
 416                 tnl = enic->overlay_offload &&
 417                         (ciflags & CQ_ENET_RQ_DESC_FLAGS_FCOE) != 0;
 418                 /* cq rx flags are only valid if eop bit is set */
 419                 first_seg->packet_type =
 420                         enic_cq_rx_flags_to_pkt_type(&cqd, tnl);
 421                 enic_cq_rx_to_pkt_flags(&cqd, first_seg);
 422                 /* Wipe the outer types set by enic_cq_rx_flags_to_pkt_type() */
 423                 if (tnl) {
 424                         first_seg->packet_type &= ~(RTE_PTYPE_L3_MASK |
 425                                                     RTE_PTYPE_L4_MASK);
 426                 }
 427                 if (unlikely(packet_error)) {
 428                         rte_pktmbuf_free(first_seg);
 429                         rte_atomic64_inc(&enic->soft_stats.rx_packet_errors);
 430                         continue;
 431                 }
 432
 433
 434                 /* prefetch mbuf data for caller */
 435                 rte_packet_prefetch(RTE_PTR_ADD(first_seg->buf_addr,
 436                                     RTE_PKTMBUF_HEADROOM));
 437
 438                 /* store the mbuf address into the next entry of the array */
 439                 rx_pkts[nb_rx++] = first_seg;
 440         }
 441
 442         sop_rq->pkt_first_seg = first_seg;
 443         sop_rq->pkt_last_seg = last_seg;
 444
 445         cq->to_clean = cq_idx;
 446
 447         if ((sop_rq->rx_nb_hold + data_rq->rx_nb_hold) >
 448             sop_rq->rx_free_thresh) {
 449                 if (data_rq->in_use) {
 450                         data_rq->posted_index =
 451                                 enic_ring_add(data_rq->ring.desc_count,
 452                                               data_rq->posted_index,
 453                                               data_rq->rx_nb_hold);
 454                         data_rq->rx_nb_hold = 0;
 455                 }
 456                 sop_rq->posted_index = enic_ring_add(sop_rq->ring.desc_count,
 457                                                      sop_rq->posted_index,
 458                                                      sop_rq->rx_nb_hold);
 459                 sop_rq->rx_nb_hold = 0;
 460
 461                 rte_mb();
 462                 if (data_rq->in_use)
 463                         iowrite32_relaxed(data_rq->posted_index,
 464                                           &data_rq->ctrl->posted_index);
 465                 rte_compiler_barrier();
 466                 iowrite32_relaxed(sop_rq->posted_index,
 467                                   &sop_rq->ctrl->posted_index);
 468         }
 469
 470
 471         return nb_rx;
 472 }
 473
 474 static inline void enic_free_wq_bufs(struct vnic_wq *wq, u16 completed_index)
 475 {
 476         struct rte_mbuf *buf;
 477         struct rte_mbuf *m, *free[ENIC_MAX_WQ_DESCS];
 478         unsigned int nb_to_free, nb_free = 0, i;
 479         struct rte_mempool *pool;
 480         unsigned int tail_idx;
 481         unsigned int desc_count = wq->ring.desc_count;
 482
 483         nb_to_free = enic_ring_sub(desc_count, wq->tail_idx, completed_index)
 484                                    + 1;
 485         tail_idx = wq->tail_idx;
 486         pool = wq->bufs[tail_idx]->pool;
 487         for (i = 0; i < nb_to_free; i++) {
 488                 buf = wq->bufs[tail_idx];
 489                 m = rte_pktmbuf_prefree_seg(buf);
 490                 if (unlikely(m == NULL)) {
 491                         tail_idx = enic_ring_incr(desc_count, tail_idx);
 492                         continue;
 493                 }
 494
 495                 if (likely(m->pool == pool)) {
 496                         RTE_ASSERT(nb_free < ENIC_MAX_WQ_DESCS);
 497                         free[nb_free++] = m;
 498                 } else {
 499                         rte_mempool_put_bulk(pool, (void *)free, nb_free);
 500                         free[0] = m;
 501                         nb_free = 1;
 502                         pool = m->pool;
 503                 }
 504                 tail_idx = enic_ring_incr(desc_count, tail_idx);
 505         }
 506
 507         if (nb_free > 0)
 508                 rte_mempool_put_bulk(pool, (void **)free, nb_free);
 509
 510         wq->tail_idx = tail_idx;
 511         wq->ring.desc_avail += nb_to_free;
 512 }
 513
 514 unsigned int enic_cleanup_wq(__rte_unused struct enic *enic, struct vnic_wq *wq)
 515 {
 516         u16 completed_index;
 517
 518         completed_index = *((uint32_t *)wq->cqmsg_rz->addr) & 0xffff;
 519
 520         if (wq->last_completed_index != completed_index) {
 521                 enic_free_wq_bufs(wq, completed_index);
 522                 wq->last_completed_index = completed_index;
 523         }
 524         return 0;
 525 }
 526
 527 uint16_t enic_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 528                         uint16_t nb_pkts)
 529 {
 530         struct vnic_wq *wq = (struct vnic_wq *)tx_queue;
 531         int32_t ret;
 532         uint16_t i;
 533         uint64_t ol_flags;
 534         struct rte_mbuf *m;
 535
 536         for (i = 0; i != nb_pkts; i++) {
 537                 m = tx_pkts[i];
 538                 ol_flags = m->ol_flags;
 539                 if (ol_flags & wq->tx_offload_notsup_mask) {
 540                         rte_errno = ENOTSUP;
 541                         return i;
 542                 }
 543 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
 544                 ret = rte_validate_tx_offload(m);
 545                 if (ret != 0) {
 546                         rte_errno = ret;
 547                         return i;
 548                 }
 549 #endif
 550                 ret = rte_net_intel_cksum_prepare(m);
 551                 if (ret != 0) {
 552                         rte_errno = ret;
 553                         return i;
 554                 }
 555         }
 556
 557         return i;
 558 }
 559
 560 uint16_t enic_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 561         uint16_t nb_pkts)
 562 {
 563         uint16_t index;
 564         unsigned int pkt_len, data_len;
 565         unsigned int nb_segs;
 566         struct rte_mbuf *tx_pkt;
 567         struct vnic_wq *wq = (struct vnic_wq *)tx_queue;
 568         struct enic *enic = vnic_dev_priv(wq->vdev);
 569         unsigned short vlan_id;
 570         uint64_t ol_flags;
 571         uint64_t ol_flags_mask;
 572         unsigned int wq_desc_avail;
 573         int head_idx;
 574         unsigned int desc_count;
 575         struct wq_enet_desc *descs, *desc_p, desc_tmp;
 576         uint16_t mss;
 577         uint8_t vlan_tag_insert;
 578         uint8_t eop;
 579         uint64_t bus_addr;
 580         uint8_t offload_mode;
 581         uint16_t header_len;
 582         uint64_t tso;
 583         rte_atomic64_t *tx_oversized;
 584
 585         enic_cleanup_wq(enic, wq);
 586         wq_desc_avail = vnic_wq_desc_avail(wq);
 587         head_idx = wq->head_idx;
 588         desc_count = wq->ring.desc_count;
 589         ol_flags_mask = PKT_TX_VLAN_PKT | PKT_TX_IP_CKSUM | PKT_TX_L4_MASK;
 590         tx_oversized = &enic->soft_stats.tx_oversized;
 591
 592         nb_pkts = RTE_MIN(nb_pkts, ENIC_TX_XMIT_MAX);
 593
 594         for (index = 0; index < nb_pkts; index++) {
 595                 tx_pkt = *tx_pkts++;
 596                 pkt_len = tx_pkt->pkt_len;
 597                 data_len = tx_pkt->data_len;
 598                 ol_flags = tx_pkt->ol_flags;
 599                 nb_segs = tx_pkt->nb_segs;
 600                 tso = ol_flags & PKT_TX_TCP_SEG;
 601
 602                 /* drop packet if it's too big to send */
 603                 if (unlikely(!tso && pkt_len > ENIC_TX_MAX_PKT_SIZE)) {
 604                         rte_pktmbuf_free(tx_pkt);
 605                         rte_atomic64_inc(tx_oversized);
 606                         continue;
 607                 }
 608
 609                 if (nb_segs > wq_desc_avail) {
 610                         if (index > 0)
 611                                 goto post;
 612                         goto done;
 613                 }
 614
 615                 mss = 0;
 616                 vlan_id = tx_pkt->vlan_tci;
 617                 vlan_tag_insert = !!(ol_flags & PKT_TX_VLAN_PKT);
 618                 bus_addr = (dma_addr_t)
 619                            (tx_pkt->buf_iova + tx_pkt->data_off);
 620
 621                 descs = (struct wq_enet_desc *)wq->ring.descs;
 622                 desc_p = descs + head_idx;
 623
 624                 eop = (data_len == pkt_len);
 625                 offload_mode = WQ_ENET_OFFLOAD_MODE_CSUM;
 626                 header_len = 0;
 627
 628                 if (tso) {
 629                         header_len = tx_pkt->l2_len + tx_pkt->l3_len +
 630                                      tx_pkt->l4_len;
 631
 632                         /* Drop if non-TCP packet or TSO seg size is too big */
 633                         if (unlikely(header_len == 0 || ((tx_pkt->tso_segsz +
 634                             header_len) > ENIC_TX_MAX_PKT_SIZE))) {
 635                                 rte_pktmbuf_free(tx_pkt);
 636                                 rte_atomic64_inc(tx_oversized);
 637                                 continue;
 638                         }
 639
 640                         offload_mode = WQ_ENET_OFFLOAD_MODE_TSO;
 641                         mss = tx_pkt->tso_segsz;
 642                         /* For tunnel, need the size of outer+inner headers */
 643                         if (ol_flags & PKT_TX_TUNNEL_MASK) {
 644                                 header_len += tx_pkt->outer_l2_len +
 645                                         tx_pkt->outer_l3_len;
 646                         }
 647                 }
 648
 649                 if ((ol_flags & ol_flags_mask) && (header_len == 0)) {
 650                         if (ol_flags & PKT_TX_IP_CKSUM)
 651                                 mss |= ENIC_CALC_IP_CKSUM;
 652
 653                         /* Nic uses just 1 bit for UDP and TCP */
 654                         switch (ol_flags & PKT_TX_L4_MASK) {
 655                         case PKT_TX_TCP_CKSUM:
 656                         case PKT_TX_UDP_CKSUM:
 657                                 mss |= ENIC_CALC_TCP_UDP_CKSUM;
 658                                 break;
 659                         }
 660                 }
 661
 662
 663                 wq_enet_desc_enc(&desc_tmp, bus_addr, data_len, mss, header_len,
 664                                  offload_mode, eop, eop, 0, vlan_tag_insert,
 665                                  vlan_id, 0);
 666
 667                 *desc_p = desc_tmp;
 668                 wq->bufs[head_idx] = tx_pkt;
 669                 head_idx = enic_ring_incr(desc_count, head_idx);
 670                 wq_desc_avail--;
 671
 672                 if (!eop) {
 673                         for (tx_pkt = tx_pkt->next; tx_pkt; tx_pkt =
 674                             tx_pkt->next) {
 675                                 data_len = tx_pkt->data_len;
 676
 677                                 if (tx_pkt->next == NULL)
 678                                         eop = 1;
 679                                 desc_p = descs + head_idx;
 680                                 bus_addr = (dma_addr_t)(tx_pkt->buf_iova
 681                                            + tx_pkt->data_off);
 682                                 wq_enet_desc_enc((struct wq_enet_desc *)
 683                                                  &desc_tmp, bus_addr, data_len,
 684                                                  mss, 0, offload_mode, eop, eop,
 685                                                  0, vlan_tag_insert, vlan_id,
 686                                                  0);
 687
 688                                 *desc_p = desc_tmp;
 689                                 wq->bufs[head_idx] = tx_pkt;
 690                                 head_idx = enic_ring_incr(desc_count, head_idx);
 691                                 wq_desc_avail--;
 692                         }
 693                 }
 694         }
 695  post:
 696         rte_wmb();
 697         iowrite32_relaxed(head_idx, &wq->ctrl->posted_index);
 698  done:
 699         wq->ring.desc_avail = wq_desc_avail;
 700         wq->head_idx = head_idx;
 701
 702         return index;
 703 }
 704
 705