drivers/net/enic/enic_rxtx.c

   1 /* Copyright 2008-2016 Cisco Systems, Inc.  All rights reserved.
   2  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   3  *
   4  * Copyright (c) 2014, Cisco Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  * notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  * notice, this list of conditions and the following disclaimer in
  16  * the documentation and/or other materials provided with the
  17  * distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  22  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  23  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  27  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  29  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <rte_mbuf.h>
  34 #include <rte_ethdev.h>
  35 #include <rte_prefetch.h>
  36
  37 #include "enic_compat.h"
  38 #include "rq_enet_desc.h"
  39 #include "enic.h"
  40 #include "enic_vnic_wq.h"
  41
  42 #define RTE_PMD_USE_PREFETCH
  43
  44 #ifdef RTE_PMD_USE_PREFETCH
  45 /*Prefetch a cache line into all cache levels. */
  46 #define rte_enic_prefetch(p) rte_prefetch0(p)
  47 #else
  48 #define rte_enic_prefetch(p) do {} while (0)
  49 #endif
  50
  51 #ifdef RTE_PMD_PACKET_PREFETCH
  52 #define rte_packet_prefetch(p) rte_prefetch1(p)
  53 #else
  54 #define rte_packet_prefetch(p) do {} while (0)
  55 #endif
  56
  57 static inline uint16_t
  58 enic_cq_rx_desc_ciflags(struct cq_enet_rq_desc *crd)
  59 {
  60         return le16_to_cpu(crd->completed_index_flags) & ~CQ_DESC_COMP_NDX_MASK;
  61 }
  62
  63 static inline uint16_t
  64 enic_cq_rx_desc_bwflags(struct cq_enet_rq_desc *crd)
  65 {
  66         return le16_to_cpu(crd->bytes_written_flags) &
  67                            ~CQ_ENET_RQ_DESC_BYTES_WRITTEN_MASK;
  68 }
  69
  70 static inline uint8_t
  71 enic_cq_rx_desc_packet_error(uint16_t bwflags)
  72 {
  73         return (bwflags & CQ_ENET_RQ_DESC_FLAGS_TRUNCATED) ==
  74                 CQ_ENET_RQ_DESC_FLAGS_TRUNCATED;
  75 }
  76
  77 static inline uint8_t
  78 enic_cq_rx_desc_eop(uint16_t ciflags)
  79 {
  80         return (ciflags & CQ_ENET_RQ_DESC_FLAGS_EOP)
  81                 == CQ_ENET_RQ_DESC_FLAGS_EOP;
  82 }
  83
  84 static inline uint8_t
  85 enic_cq_rx_desc_csum_not_calc(struct cq_enet_rq_desc *cqrd)
  86 {
  87         return (le16_to_cpu(cqrd->q_number_rss_type_flags) &
  88                 CQ_ENET_RQ_DESC_FLAGS_CSUM_NOT_CALC) ==
  89                 CQ_ENET_RQ_DESC_FLAGS_CSUM_NOT_CALC;
  90 }
  91
  92 static inline uint8_t
  93 enic_cq_rx_desc_ipv4_csum_ok(struct cq_enet_rq_desc *cqrd)
  94 {
  95         return (cqrd->flags & CQ_ENET_RQ_DESC_FLAGS_IPV4_CSUM_OK) ==
  96                 CQ_ENET_RQ_DESC_FLAGS_IPV4_CSUM_OK;
  97 }
  98
  99 static inline uint8_t
 100 enic_cq_rx_desc_tcp_udp_csum_ok(struct cq_enet_rq_desc *cqrd)
 101 {
 102         return (cqrd->flags & CQ_ENET_RQ_DESC_FLAGS_TCP_UDP_CSUM_OK) ==
 103                 CQ_ENET_RQ_DESC_FLAGS_TCP_UDP_CSUM_OK;
 104 }
 105
 106 static inline uint8_t
 107 enic_cq_rx_desc_rss_type(struct cq_enet_rq_desc *cqrd)
 108 {
 109         return (uint8_t)((le16_to_cpu(cqrd->q_number_rss_type_flags) >>
 110                 CQ_DESC_Q_NUM_BITS) & CQ_ENET_RQ_DESC_RSS_TYPE_MASK);
 111 }
 112
 113 static inline uint32_t
 114 enic_cq_rx_desc_rss_hash(struct cq_enet_rq_desc *cqrd)
 115 {
 116         return le32_to_cpu(cqrd->rss_hash);
 117 }
 118
 119 static inline uint16_t
 120 enic_cq_rx_desc_vlan(struct cq_enet_rq_desc *cqrd)
 121 {
 122         return le16_to_cpu(cqrd->vlan);
 123 }
 124
 125 static inline uint16_t
 126 enic_cq_rx_desc_n_bytes(struct cq_desc *cqd)
 127 {
 128         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 129         return le16_to_cpu(cqrd->bytes_written_flags) &
 130                 CQ_ENET_RQ_DESC_BYTES_WRITTEN_MASK;
 131 }
 132
 133 static inline uint8_t
 134 enic_cq_rx_check_err(struct cq_desc *cqd)
 135 {
 136         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 137         uint16_t bwflags;
 138
 139         bwflags = enic_cq_rx_desc_bwflags(cqrd);
 140         if (unlikely(enic_cq_rx_desc_packet_error(bwflags)))
 141                 return 1;
 142         return 0;
 143 }
 144
 145 /* Lookup table to translate RX CQ flags to mbuf flags. */
 146 static inline uint32_t
 147 enic_cq_rx_flags_to_pkt_type(struct cq_desc *cqd)
 148 {
 149         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 150         uint8_t cqrd_flags = cqrd->flags;
 151         static const uint32_t cq_type_table[128] __rte_cache_aligned = {
 152                 [32] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4,
 153                 [34] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4
 154                         | RTE_PTYPE_L4_UDP,
 155                 [36] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4
 156                         | RTE_PTYPE_L4_TCP,
 157                 [96] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4
 158                         | RTE_PTYPE_L4_FRAG,
 159                 [16] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV6,
 160                 [18] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV6
 161                         | RTE_PTYPE_L4_UDP,
 162                 [20] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV6
 163                         | RTE_PTYPE_L4_TCP,
 164                 [80] =  RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV6
 165                         | RTE_PTYPE_L4_FRAG,
 166                 /* All others reserved */
 167         };
 168         cqrd_flags &= CQ_ENET_RQ_DESC_FLAGS_IPV4_FRAGMENT
 169                 | CQ_ENET_RQ_DESC_FLAGS_IPV4 | CQ_ENET_RQ_DESC_FLAGS_IPV6
 170                 | CQ_ENET_RQ_DESC_FLAGS_TCP | CQ_ENET_RQ_DESC_FLAGS_UDP;
 171         return cq_type_table[cqrd_flags];
 172 }
 173
 174 static inline void
 175 enic_cq_rx_to_pkt_flags(struct cq_desc *cqd, struct rte_mbuf *mbuf)
 176 {
 177         struct cq_enet_rq_desc *cqrd = (struct cq_enet_rq_desc *)cqd;
 178         uint16_t ciflags, bwflags, pkt_flags = 0;
 179         ciflags = enic_cq_rx_desc_ciflags(cqrd);
 180         bwflags = enic_cq_rx_desc_bwflags(cqrd);
 181
 182         mbuf->ol_flags = 0;
 183
 184         /* flags are meaningless if !EOP */
 185         if (unlikely(!enic_cq_rx_desc_eop(ciflags)))
 186                 goto mbuf_flags_done;
 187
 188         /* VLAN stripping */
 189         if (bwflags & CQ_ENET_RQ_DESC_FLAGS_VLAN_STRIPPED) {
 190                 pkt_flags |= PKT_RX_VLAN_PKT | PKT_RX_VLAN_STRIPPED;
 191                 mbuf->vlan_tci = enic_cq_rx_desc_vlan(cqrd);
 192         } else {
 193                 mbuf->vlan_tci = 0;
 194         }
 195
 196         /* RSS flag */
 197         if (enic_cq_rx_desc_rss_type(cqrd)) {
 198                 pkt_flags |= PKT_RX_RSS_HASH;
 199                 mbuf->hash.rss = enic_cq_rx_desc_rss_hash(cqrd);
 200         }
 201
 202         /* checksum flags */
 203         if (!enic_cq_rx_desc_csum_not_calc(cqrd) &&
 204                 (mbuf->packet_type & RTE_PTYPE_L3_IPV4)) {
 205                 if (unlikely(!enic_cq_rx_desc_ipv4_csum_ok(cqrd)))
 206                         pkt_flags |= PKT_RX_IP_CKSUM_BAD;
 207                 if (mbuf->packet_type & (RTE_PTYPE_L4_UDP | RTE_PTYPE_L4_TCP)) {
 208                         if (unlikely(!enic_cq_rx_desc_tcp_udp_csum_ok(cqrd)))
 209                                 pkt_flags |= PKT_RX_L4_CKSUM_BAD;
 210                 }
 211         }
 212
 213  mbuf_flags_done:
 214         mbuf->ol_flags = pkt_flags;
 215 }
 216
 217 uint16_t
 218 enic_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 219                uint16_t nb_pkts)
 220 {
 221         struct vnic_rq *rq = rx_queue;
 222         struct enic *enic = vnic_dev_priv(rq->vdev);
 223         unsigned int rx_id;
 224         struct rte_mbuf *nmb, *rxmb;
 225         uint16_t nb_rx = 0, nb_err = 0;
 226         uint16_t nb_hold;
 227         struct vnic_cq *cq;
 228         volatile struct cq_desc *cqd_ptr;
 229         uint8_t color;
 230
 231         cq = &enic->cq[enic_cq_rq(enic, rq->index)];
 232         rx_id = cq->to_clean;           /* index of cqd, rqd, mbuf_table */
 233         cqd_ptr = (struct cq_desc *)(cq->ring.descs) + rx_id;
 234
 235         nb_hold = rq->rx_nb_hold;       /* mbufs held by software */
 236
 237         while (nb_rx < nb_pkts) {
 238                 volatile struct rq_enet_desc *rqd_ptr;
 239                 dma_addr_t dma_addr;
 240                 struct cq_desc cqd;
 241                 uint8_t packet_error;
 242
 243                 /* Check for pkts available */
 244                 color = (cqd_ptr->type_color >> CQ_DESC_COLOR_SHIFT)
 245                         & CQ_DESC_COLOR_MASK;
 246                 if (color == cq->last_color)
 247                         break;
 248
 249                 /* Get the cq descriptor and rq pointer */
 250                 cqd = *cqd_ptr;
 251                 rqd_ptr = (struct rq_enet_desc *)(rq->ring.descs) + rx_id;
 252
 253                 /* allocate a new mbuf */
 254                 nmb = rte_mbuf_raw_alloc(rq->mp);
 255                 if (nmb == NULL) {
 256                         rte_atomic64_inc(&enic->soft_stats.rx_nombuf);
 257                         break;
 258                 }
 259
 260                 /* A packet error means descriptor and data are untrusted */
 261                 packet_error = enic_cq_rx_check_err(&cqd);
 262
 263                 /* Get the mbuf to return and replace with one just allocated */
 264                 rxmb = rq->mbuf_ring[rx_id];
 265                 rq->mbuf_ring[rx_id] = nmb;
 266
 267                 /* Increment cqd, rqd, mbuf_table index */
 268                 rx_id++;
 269                 if (unlikely(rx_id == rq->ring.desc_count)) {
 270                         rx_id = 0;
 271                         cq->last_color = cq->last_color ? 0 : 1;
 272                 }
 273
 274                 /* Prefetch next mbuf & desc while processing current one */
 275                 cqd_ptr = (struct cq_desc *)(cq->ring.descs) + rx_id;
 276                 rte_enic_prefetch(cqd_ptr);
 277                 rte_enic_prefetch(rq->mbuf_ring[rx_id]);
 278                 rte_enic_prefetch((struct rq_enet_desc *)(rq->ring.descs)
 279                                  + rx_id);
 280
 281                 /* Push descriptor for newly allocated mbuf */
 282                 dma_addr = (dma_addr_t)(nmb->buf_physaddr
 283                            + RTE_PKTMBUF_HEADROOM);
 284                 rqd_ptr->address = rte_cpu_to_le_64(dma_addr);
 285                 rqd_ptr->length_type = cpu_to_le16(nmb->buf_len
 286                                        - RTE_PKTMBUF_HEADROOM);
 287
 288                 /* Drop incoming bad packet */
 289                 if (unlikely(packet_error)) {
 290                         rte_pktmbuf_free(rxmb);
 291                         nb_err++;
 292                         continue;
 293                 }
 294
 295                 /* Fill in the rest of the mbuf */
 296                 rxmb->data_off = RTE_PKTMBUF_HEADROOM;
 297                 rxmb->nb_segs = 1;
 298                 rxmb->next = NULL;
 299                 rxmb->port = enic->port_id;
 300                 rxmb->pkt_len = enic_cq_rx_desc_n_bytes(&cqd);
 301                 rxmb->packet_type = enic_cq_rx_flags_to_pkt_type(&cqd);
 302                 enic_cq_rx_to_pkt_flags(&cqd, rxmb);
 303                 rxmb->data_len = rxmb->pkt_len;
 304
 305                 /* prefetch mbuf data for caller */
 306                 rte_packet_prefetch(RTE_PTR_ADD(rxmb->buf_addr,
 307                                     RTE_PKTMBUF_HEADROOM));
 308
 309                 /* store the mbuf address into the next entry of the array */
 310                 rx_pkts[nb_rx++] = rxmb;
 311         }
 312
 313         nb_hold += nb_rx + nb_err;
 314         cq->to_clean = rx_id;
 315
 316         if (nb_hold > rq->rx_free_thresh) {
 317                 rq->posted_index = enic_ring_add(rq->ring.desc_count,
 318                                 rq->posted_index, nb_hold);
 319                 nb_hold = 0;
 320                 rte_mb();
 321                 iowrite32(rq->posted_index, &rq->ctrl->posted_index);
 322         }
 323
 324         rq->rx_nb_hold = nb_hold;
 325
 326         return nb_rx;
 327 }
 328
 329 static void enic_wq_free_buf(struct vnic_wq *wq,
 330         __rte_unused struct cq_desc *cq_desc,
 331         struct vnic_wq_buf *buf,
 332         __rte_unused void *opaque)
 333 {
 334         enic_free_wq_buf(wq, buf);
 335 }
 336
 337 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 338         __rte_unused u8 type, u16 q_number, u16 completed_index, void *opaque)
 339 {
 340         struct enic *enic = vnic_dev_priv(vdev);
 341
 342         vnic_wq_service(&enic->wq[q_number], cq_desc,
 343                 completed_index, enic_wq_free_buf,
 344                 opaque);
 345
 346         return 0;
 347 }
 348
 349 unsigned int enic_cleanup_wq(struct enic *enic, struct vnic_wq *wq)
 350 {
 351         u16 completed_index = *((uint32_t *)wq->cqmsg_rz->addr) & 0xffff;
 352
 353         if (wq->last_completed_index != completed_index) {
 354                 enic_wq_service(enic->vdev, NULL, 0, wq->index,
 355                                 completed_index, NULL);
 356                 wq->last_completed_index = completed_index;
 357         }
 358         return 0;
 359 }
 360
 361 void enic_post_wq_index(struct vnic_wq *wq)
 362 {
 363         enic_vnic_post_wq_index(wq);
 364 }
 365
 366 void enic_send_pkt(struct enic *enic, struct vnic_wq *wq,
 367                    struct rte_mbuf *tx_pkt, unsigned short len,
 368                    uint8_t sop, uint8_t eop, uint8_t cq_entry,
 369                    uint16_t ol_flags, uint16_t vlan_tag)
 370 {
 371         struct wq_enet_desc *desc, *descs;
 372         uint16_t mss = 0;
 373         uint8_t vlan_tag_insert = 0;
 374         uint64_t bus_addr = (dma_addr_t)
 375             (tx_pkt->buf_physaddr + tx_pkt->data_off);
 376
 377         descs = (struct wq_enet_desc *)wq->ring.descs;
 378         desc = descs + wq->head_idx;
 379
 380         if (sop) {
 381                 if (ol_flags & PKT_TX_VLAN_PKT)
 382                         vlan_tag_insert = 1;
 383
 384                 if (enic->hw_ip_checksum) {
 385                         if (ol_flags & PKT_TX_IP_CKSUM)
 386                                 mss |= ENIC_CALC_IP_CKSUM;
 387
 388                         if (ol_flags & PKT_TX_TCP_UDP_CKSUM)
 389                                 mss |= ENIC_CALC_TCP_UDP_CKSUM;
 390                 }
 391         }
 392
 393         wq_enet_desc_enc(desc,
 394                 bus_addr,
 395                 len,
 396                 mss,
 397                 0 /* header_length */,
 398                 0 /* offload_mode WQ_ENET_OFFLOAD_MODE_CSUM */,
 399                 eop,
 400                 cq_entry,
 401                 0 /* fcoe_encap */,
 402                 vlan_tag_insert,
 403                 vlan_tag,
 404                 0 /* loopback */);
 405
 406         enic_vnic_post_wq(wq, (void *)tx_pkt, cq_entry);
 407 }
 408
 409 uint16_t enic_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 410         uint16_t nb_pkts)
 411 {
 412         uint16_t index;
 413         unsigned int frags;
 414         unsigned int pkt_len;
 415         unsigned int seg_len;
 416         unsigned int inc_len;
 417         unsigned int nb_segs;
 418         struct rte_mbuf *tx_pkt, *next_tx_pkt;
 419         struct vnic_wq *wq = (struct vnic_wq *)tx_queue;
 420         struct enic *enic = vnic_dev_priv(wq->vdev);
 421         unsigned short vlan_id;
 422         unsigned short ol_flags;
 423         uint8_t last_seg, eop;
 424         unsigned int host_tx_descs = 0;
 425
 426         for (index = 0; index < nb_pkts; index++) {
 427                 tx_pkt = *tx_pkts++;
 428                 inc_len = 0;
 429                 nb_segs = tx_pkt->nb_segs;
 430                 if (nb_segs > vnic_wq_desc_avail(wq)) {
 431                         if (index > 0)
 432                                 enic_post_wq_index(wq);
 433
 434                         /* wq cleanup and try again */
 435                         if (!enic_cleanup_wq(enic, wq) ||
 436                                 (nb_segs > vnic_wq_desc_avail(wq))) {
 437                                 return index;
 438                         }
 439                 }
 440
 441                 pkt_len = tx_pkt->pkt_len;
 442                 vlan_id = tx_pkt->vlan_tci;
 443                 ol_flags = tx_pkt->ol_flags;
 444                 for (frags = 0; inc_len < pkt_len; frags++) {
 445                         if (!tx_pkt)
 446                                 break;
 447                         next_tx_pkt = tx_pkt->next;
 448                         seg_len = tx_pkt->data_len;
 449                         inc_len += seg_len;
 450
 451                         host_tx_descs++;
 452                         last_seg = 0;
 453                         eop = 0;
 454                         if ((pkt_len == inc_len) || !next_tx_pkt) {
 455                                 eop = 1;
 456                                 /* post if last packet in batch or > thresh */
 457                                 if ((index == (nb_pkts - 1)) ||
 458                                    (host_tx_descs > ENIC_TX_POST_THRESH)) {
 459                                         last_seg = 1;
 460                                         host_tx_descs = 0;
 461                                 }
 462                         }
 463                         enic_send_pkt(enic, wq, tx_pkt, (unsigned short)seg_len,
 464                                       !frags, eop, last_seg, ol_flags, vlan_id);
 465                         tx_pkt = next_tx_pkt;
 466                 }
 467         }
 468
 469         enic_cleanup_wq(enic, wq);
 470         return index;
 471 }