drivers/net/fm10k/fm10k_rxtx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2013-2016 Intel Corporation
   3  */
   4
   5 #include <inttypes.h>
   6
   7 #include <rte_ethdev_driver.h>
   8 #include <rte_common.h>
   9 #include <rte_net.h>
  10 #include "fm10k.h"
  11 #include "base/fm10k_type.h"
  12
  13 #ifdef RTE_PMD_PACKET_PREFETCH
  14 #define rte_packet_prefetch(p)  rte_prefetch1(p)
  15 #else
  16 #define rte_packet_prefetch(p)  do {} while (0)
  17 #endif
  18
  19 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
  20 static inline void dump_rxd(union fm10k_rx_desc *rxd)
  21 {
  22         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  23         PMD_RX_LOG(DEBUG, "|     GLORT      | PKT HDR & TYPE |");
  24         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", rxd->d.glort,
  25                         rxd->d.data);
  26         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  27         PMD_RX_LOG(DEBUG, "|   VLAN & LEN   |     STATUS     |");
  28         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", rxd->d.vlan_len,
  29                         rxd->d.staterr);
  30         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  31         PMD_RX_LOG(DEBUG, "|    RESERVED    |    RSS_HASH    |");
  32         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", 0, rxd->d.rss);
  33         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  34         PMD_RX_LOG(DEBUG, "|            TIME TAG             |");
  35         PMD_RX_LOG(DEBUG, "|       0x%016"PRIx64"        |", rxd->q.timestamp);
  36         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  37 }
  38 #endif
  39
  40 #define FM10K_TX_OFFLOAD_MASK (  \
  41                 PKT_TX_VLAN_PKT |        \
  42                 PKT_TX_IP_CKSUM |        \
  43                 PKT_TX_L4_MASK |         \
  44                 PKT_TX_TCP_SEG)
  45
  46 #define FM10K_TX_OFFLOAD_NOTSUP_MASK \
  47                 (PKT_TX_OFFLOAD_MASK ^ FM10K_TX_OFFLOAD_MASK)
  48
  49 /* @note: When this function is changed, make corresponding change to
  50  * fm10k_dev_supported_ptypes_get()
  51  */
  52 static inline void
  53 rx_desc_to_ol_flags(struct rte_mbuf *m, const union fm10k_rx_desc *d)
  54 {
  55         static const uint32_t
  56                 ptype_table[FM10K_RXD_PKTTYPE_MASK >> FM10K_RXD_PKTTYPE_SHIFT]
  57                         __rte_cache_aligned = {
  58                 [FM10K_PKTTYPE_OTHER] = RTE_PTYPE_L2_ETHER,
  59                 [FM10K_PKTTYPE_IPV4] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4,
  60                 [FM10K_PKTTYPE_IPV4_EX] = RTE_PTYPE_L2_ETHER |
  61                         RTE_PTYPE_L3_IPV4_EXT,
  62                 [FM10K_PKTTYPE_IPV6] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV6,
  63                 [FM10K_PKTTYPE_IPV6_EX] = RTE_PTYPE_L2_ETHER |
  64                         RTE_PTYPE_L3_IPV6_EXT,
  65                 [FM10K_PKTTYPE_IPV4 | FM10K_PKTTYPE_TCP] = RTE_PTYPE_L2_ETHER |
  66                         RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L4_TCP,
  67                 [FM10K_PKTTYPE_IPV6 | FM10K_PKTTYPE_TCP] = RTE_PTYPE_L2_ETHER |
  68                         RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_TCP,
  69                 [FM10K_PKTTYPE_IPV4 | FM10K_PKTTYPE_UDP] = RTE_PTYPE_L2_ETHER |
  70                         RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L4_UDP,
  71                 [FM10K_PKTTYPE_IPV6 | FM10K_PKTTYPE_UDP] = RTE_PTYPE_L2_ETHER |
  72                         RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_UDP,
  73         };
  74
  75         m->packet_type = ptype_table[(d->w.pkt_info & FM10K_RXD_PKTTYPE_MASK)
  76                                                 >> FM10K_RXD_PKTTYPE_SHIFT];
  77
  78         if (d->w.pkt_info & FM10K_RXD_RSSTYPE_MASK)
  79                 m->ol_flags |= PKT_RX_RSS_HASH;
  80
  81         if (unlikely((d->d.staterr &
  82                 (FM10K_RXD_STATUS_IPCS | FM10K_RXD_STATUS_IPE)) ==
  83                 (FM10K_RXD_STATUS_IPCS | FM10K_RXD_STATUS_IPE)))
  84                 m->ol_flags |= PKT_RX_IP_CKSUM_BAD;
  85         else
  86                 m->ol_flags |= PKT_RX_IP_CKSUM_GOOD;
  87
  88         if (unlikely((d->d.staterr &
  89                 (FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)) ==
  90                 (FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)))
  91                 m->ol_flags |= PKT_RX_L4_CKSUM_BAD;
  92         else
  93                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
  94 }
  95
  96 uint16_t
  97 fm10k_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
  98         uint16_t nb_pkts)
  99 {
 100         struct rte_mbuf *mbuf;
 101         union fm10k_rx_desc desc;
 102         struct fm10k_rx_queue *q = rx_queue;
 103         uint16_t count = 0;
 104         int alloc = 0;
 105         uint16_t next_dd;
 106         int ret;
 107
 108         next_dd = q->next_dd;
 109
 110         nb_pkts = RTE_MIN(nb_pkts, q->alloc_thresh);
 111         for (count = 0; count < nb_pkts; ++count) {
 112                 if (!(q->hw_ring[next_dd].d.staterr & FM10K_RXD_STATUS_DD))
 113                         break;
 114                 mbuf = q->sw_ring[next_dd];
 115                 desc = q->hw_ring[next_dd];
 116 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
 117                 dump_rxd(&desc);
 118 #endif
 119                 rte_pktmbuf_pkt_len(mbuf) = desc.w.length;
 120                 rte_pktmbuf_data_len(mbuf) = desc.w.length;
 121
 122                 mbuf->ol_flags = 0;
 123 #ifdef RTE_LIBRTE_FM10K_RX_OLFLAGS_ENABLE
 124                 rx_desc_to_ol_flags(mbuf, &desc);
 125 #endif
 126
 127                 mbuf->hash.rss = desc.d.rss;
 128                 /**
 129                  * Packets in fm10k device always carry at least one VLAN tag.
 130                  * For those packets coming in without VLAN tag,
 131                  * the port default VLAN tag will be used.
 132                  * So, always PKT_RX_VLAN flag is set and vlan_tci
 133                  * is valid for each RX packet's mbuf.
 134                  */
 135                 mbuf->ol_flags |= PKT_RX_VLAN;
 136                 mbuf->vlan_tci = desc.w.vlan;
 137                 /**
 138                  * mbuf->vlan_tci_outer is an idle field in fm10k driver,
 139                  * so it can be selected to store sglort value.
 140                  */
 141                 if (q->rx_ftag_en)
 142                         mbuf->vlan_tci_outer = rte_le_to_cpu_16(desc.w.sglort);
 143
 144                 rx_pkts[count] = mbuf;
 145                 if (++next_dd == q->nb_desc) {
 146                         next_dd = 0;
 147                         alloc = 1;
 148                 }
 149
 150                 /* Prefetch next mbuf while processing current one. */
 151                 rte_prefetch0(q->sw_ring[next_dd]);
 152
 153                 /*
 154                  * When next RX descriptor is on a cache-line boundary,
 155                  * prefetch the next 4 RX descriptors and the next 8 pointers
 156                  * to mbufs.
 157                  */
 158                 if ((next_dd & 0x3) == 0) {
 159                         rte_prefetch0(&q->hw_ring[next_dd]);
 160                         rte_prefetch0(&q->sw_ring[next_dd]);
 161                 }
 162         }
 163
 164         q->next_dd = next_dd;
 165
 166         if ((q->next_dd > q->next_trigger) || (alloc == 1)) {
 167                 ret = rte_mempool_get_bulk(q->mp,
 168                                         (void **)&q->sw_ring[q->next_alloc],
 169                                         q->alloc_thresh);
 170
 171                 if (unlikely(ret != 0)) {
 172                         uint16_t port = q->port_id;
 173                         PMD_RX_LOG(ERR, "Failed to alloc mbuf");
 174                         /*
 175                          * Need to restore next_dd if we cannot allocate new
 176                          * buffers to replenish the old ones.
 177                          */
 178                         q->next_dd = (q->next_dd + q->nb_desc - count) %
 179                                                                 q->nb_desc;
 180                         rte_eth_devices[port].data->rx_mbuf_alloc_failed++;
 181                         return 0;
 182                 }
 183
 184                 for (; q->next_alloc <= q->next_trigger; ++q->next_alloc) {
 185                         mbuf = q->sw_ring[q->next_alloc];
 186
 187                         /* setup static mbuf fields */
 188                         fm10k_pktmbuf_reset(mbuf, q->port_id);
 189
 190                         /* write descriptor */
 191                         desc.q.pkt_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 192                         desc.q.hdr_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 193                         q->hw_ring[q->next_alloc] = desc;
 194                 }
 195                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_trigger);
 196                 q->next_trigger += q->alloc_thresh;
 197                 if (q->next_trigger >= q->nb_desc) {
 198                         q->next_trigger = q->alloc_thresh - 1;
 199                         q->next_alloc = 0;
 200                 }
 201         }
 202
 203         return count;
 204 }
 205
 206 uint16_t
 207 fm10k_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 208                                 uint16_t nb_pkts)
 209 {
 210         struct rte_mbuf *mbuf;
 211         union fm10k_rx_desc desc;
 212         struct fm10k_rx_queue *q = rx_queue;
 213         uint16_t count = 0;
 214         uint16_t nb_rcv, nb_seg;
 215         int alloc = 0;
 216         uint16_t next_dd;
 217         struct rte_mbuf *first_seg = q->pkt_first_seg;
 218         struct rte_mbuf *last_seg = q->pkt_last_seg;
 219         int ret;
 220
 221         next_dd = q->next_dd;
 222         nb_rcv = 0;
 223
 224         nb_seg = RTE_MIN(nb_pkts, q->alloc_thresh);
 225         for (count = 0; count < nb_seg; count++) {
 226                 if (!(q->hw_ring[next_dd].d.staterr & FM10K_RXD_STATUS_DD))
 227                         break;
 228                 mbuf = q->sw_ring[next_dd];
 229                 desc = q->hw_ring[next_dd];
 230 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
 231                 dump_rxd(&desc);
 232 #endif
 233
 234                 if (++next_dd == q->nb_desc) {
 235                         next_dd = 0;
 236                         alloc = 1;
 237                 }
 238
 239                 /* Prefetch next mbuf while processing current one. */
 240                 rte_prefetch0(q->sw_ring[next_dd]);
 241
 242                 /*
 243                  * When next RX descriptor is on a cache-line boundary,
 244                  * prefetch the next 4 RX descriptors and the next 8 pointers
 245                  * to mbufs.
 246                  */
 247                 if ((next_dd & 0x3) == 0) {
 248                         rte_prefetch0(&q->hw_ring[next_dd]);
 249                         rte_prefetch0(&q->sw_ring[next_dd]);
 250                 }
 251
 252                 /* Fill data length */
 253                 rte_pktmbuf_data_len(mbuf) = desc.w.length;
 254
 255                 /*
 256                  * If this is the first buffer of the received packet,
 257                  * set the pointer to the first mbuf of the packet and
 258                  * initialize its context.
 259                  * Otherwise, update the total length and the number of segments
 260                  * of the current scattered packet, and update the pointer to
 261                  * the last mbuf of the current packet.
 262                  */
 263                 if (!first_seg) {
 264                         first_seg = mbuf;
 265                         first_seg->pkt_len = desc.w.length;
 266                 } else {
 267                         first_seg->pkt_len =
 268                                         (uint16_t)(first_seg->pkt_len +
 269                                         rte_pktmbuf_data_len(mbuf));
 270                         first_seg->nb_segs++;
 271                         last_seg->next = mbuf;
 272                 }
 273
 274                 /*
 275                  * If this is not the last buffer of the received packet,
 276                  * update the pointer to the last mbuf of the current scattered
 277                  * packet and continue to parse the RX ring.
 278                  */
 279                 if (!(desc.d.staterr & FM10K_RXD_STATUS_EOP)) {
 280                         last_seg = mbuf;
 281                         continue;
 282                 }
 283
 284                 first_seg->ol_flags = 0;
 285 #ifdef RTE_LIBRTE_FM10K_RX_OLFLAGS_ENABLE
 286                 rx_desc_to_ol_flags(first_seg, &desc);
 287 #endif
 288                 first_seg->hash.rss = desc.d.rss;
 289                 /**
 290                  * Packets in fm10k device always carry at least one VLAN tag.
 291                  * For those packets coming in without VLAN tag,
 292                  * the port default VLAN tag will be used.
 293                  * So, always PKT_RX_VLAN flag is set and vlan_tci
 294                  * is valid for each RX packet's mbuf.
 295                  */
 296                 first_seg->ol_flags |= PKT_RX_VLAN;
 297                 first_seg->vlan_tci = desc.w.vlan;
 298                 /**
 299                  * mbuf->vlan_tci_outer is an idle field in fm10k driver,
 300                  * so it can be selected to store sglort value.
 301                  */
 302                 if (q->rx_ftag_en)
 303                         first_seg->vlan_tci_outer =
 304                                 rte_le_to_cpu_16(desc.w.sglort);
 305
 306                 /* Prefetch data of first segment, if configured to do so. */
 307                 rte_packet_prefetch((char *)first_seg->buf_addr +
 308                         first_seg->data_off);
 309
 310                 /*
 311                  * Store the mbuf address into the next entry of the array
 312                  * of returned packets.
 313                  */
 314                 rx_pkts[nb_rcv++] = first_seg;
 315
 316                 /*
 317                  * Setup receipt context for a new packet.
 318                  */
 319                 first_seg = NULL;
 320         }
 321
 322         q->next_dd = next_dd;
 323
 324         if ((q->next_dd > q->next_trigger) || (alloc == 1)) {
 325                 ret = rte_mempool_get_bulk(q->mp,
 326                                         (void **)&q->sw_ring[q->next_alloc],
 327                                         q->alloc_thresh);
 328
 329                 if (unlikely(ret != 0)) {
 330                         uint16_t port = q->port_id;
 331                         PMD_RX_LOG(ERR, "Failed to alloc mbuf");
 332                         /*
 333                          * Need to restore next_dd if we cannot allocate new
 334                          * buffers to replenish the old ones.
 335                          */
 336                         q->next_dd = (q->next_dd + q->nb_desc - count) %
 337                                                                 q->nb_desc;
 338                         rte_eth_devices[port].data->rx_mbuf_alloc_failed++;
 339                         return 0;
 340                 }
 341
 342                 for (; q->next_alloc <= q->next_trigger; ++q->next_alloc) {
 343                         mbuf = q->sw_ring[q->next_alloc];
 344
 345                         /* setup static mbuf fields */
 346                         fm10k_pktmbuf_reset(mbuf, q->port_id);
 347
 348                         /* write descriptor */
 349                         desc.q.pkt_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 350                         desc.q.hdr_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 351                         q->hw_ring[q->next_alloc] = desc;
 352                 }
 353                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_trigger);
 354                 q->next_trigger += q->alloc_thresh;
 355                 if (q->next_trigger >= q->nb_desc) {
 356                         q->next_trigger = q->alloc_thresh - 1;
 357                         q->next_alloc = 0;
 358                 }
 359         }
 360
 361         q->pkt_first_seg = first_seg;
 362         q->pkt_last_seg = last_seg;
 363
 364         return nb_rcv;
 365 }
 366
 367 int
 368 fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t offset)
 369 {
 370         volatile union fm10k_rx_desc *rxdp;
 371         struct fm10k_rx_queue *rxq = rx_queue;
 372         uint16_t desc;
 373         int ret;
 374
 375         if (unlikely(offset >= rxq->nb_desc)) {
 376                 PMD_DRV_LOG(ERR, "Invalid RX descriptor offset %u", offset);
 377                 return 0;
 378         }
 379
 380         desc = rxq->next_dd + offset;
 381         if (desc >= rxq->nb_desc)
 382                 desc -= rxq->nb_desc;
 383
 384         rxdp = &rxq->hw_ring[desc];
 385
 386         ret = !!(rxdp->w.status &
 387                         rte_cpu_to_le_16(FM10K_RXD_STATUS_DD));
 388
 389         return ret;
 390 }
 391
 392 /*
 393  * Free multiple TX mbuf at a time if they are in the same pool
 394  *
 395  * @txep: software desc ring index that starts to free
 396  * @num: number of descs to free
 397  *
 398  */
 399 static inline void tx_free_bulk_mbuf(struct rte_mbuf **txep, int num)
 400 {
 401         struct rte_mbuf *m, *free[RTE_FM10K_TX_MAX_FREE_BUF_SZ];
 402         int i;
 403         int nb_free = 0;
 404
 405         if (unlikely(num == 0))
 406                 return;
 407
 408         m = rte_pktmbuf_prefree_seg(txep[0]);
 409         if (likely(m != NULL)) {
 410                 free[0] = m;
 411                 nb_free = 1;
 412                 for (i = 1; i < num; i++) {
 413                         m = rte_pktmbuf_prefree_seg(txep[i]);
 414                         if (likely(m != NULL)) {
 415                                 if (likely(m->pool == free[0]->pool))
 416                                         free[nb_free++] = m;
 417                                 else {
 418                                         rte_mempool_put_bulk(free[0]->pool,
 419                                                         (void *)free, nb_free);
 420                                         free[0] = m;
 421                                         nb_free = 1;
 422                                 }
 423                         }
 424                         txep[i] = NULL;
 425                 }
 426                 rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free);
 427         } else {
 428                 for (i = 1; i < num; i++) {
 429                         m = rte_pktmbuf_prefree_seg(txep[i]);
 430                         if (m != NULL)
 431                                 rte_mempool_put(m->pool, m);
 432                         txep[i] = NULL;
 433                 }
 434         }
 435 }
 436
 437 static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
 438 {
 439         uint16_t next_rs, count = 0;
 440
 441         next_rs = fifo_peek(&q->rs_tracker);
 442         if (!(q->hw_ring[next_rs].flags & FM10K_TXD_FLAG_DONE))
 443                 return;
 444
 445         /* the DONE flag is set on this descriptor so remove the ID
 446          * from the RS bit tracker and free the buffers */
 447         fifo_remove(&q->rs_tracker);
 448
 449         /* wrap around? if so, free buffers from last_free up to but NOT
 450          * including nb_desc */
 451         if (q->last_free > next_rs) {
 452                 count = q->nb_desc - q->last_free;
 453                 tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
 454                 q->last_free = 0;
 455         }
 456
 457         /* adjust free descriptor count before the next loop */
 458         q->nb_free += count + (next_rs + 1 - q->last_free);
 459
 460         /* free buffers from last_free, up to and including next_rs */
 461         if (q->last_free <= next_rs) {
 462                 count = next_rs - q->last_free + 1;
 463                 tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
 464                 q->last_free += count;
 465         }
 466
 467         if (q->last_free == q->nb_desc)
 468                 q->last_free = 0;
 469 }
 470
 471 static inline void tx_xmit_pkt(struct fm10k_tx_queue *q, struct rte_mbuf *mb)
 472 {
 473         uint16_t last_id;
 474         uint8_t flags, hdrlen;
 475
 476         /* always set the LAST flag on the last descriptor used to
 477          * transmit the packet */
 478         flags = FM10K_TXD_FLAG_LAST;
 479         last_id = q->next_free + mb->nb_segs - 1;
 480         if (last_id >= q->nb_desc)
 481                 last_id = last_id - q->nb_desc;
 482
 483         /* but only set the RS flag on the last descriptor if rs_thresh
 484          * descriptors will be used since the RS flag was last set */
 485         if ((q->nb_used + mb->nb_segs) >= q->rs_thresh) {
 486                 flags |= FM10K_TXD_FLAG_RS;
 487                 fifo_insert(&q->rs_tracker, last_id);
 488                 q->nb_used = 0;
 489         } else {
 490                 q->nb_used = q->nb_used + mb->nb_segs;
 491         }
 492
 493         q->nb_free -= mb->nb_segs;
 494
 495         q->hw_ring[q->next_free].flags = 0;
 496         if (q->tx_ftag_en)
 497                 q->hw_ring[q->next_free].flags |= FM10K_TXD_FLAG_FTAG;
 498         /* set checksum flags on first descriptor of packet. SCTP checksum
 499          * offload is not supported, but we do not explicitly check for this
 500          * case in favor of greatly simplified processing. */
 501         if (mb->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
 502                 q->hw_ring[q->next_free].flags |= FM10K_TXD_FLAG_CSUM;
 503
 504         /* set vlan if requested */
 505         if (mb->ol_flags & PKT_TX_VLAN_PKT)
 506                 q->hw_ring[q->next_free].vlan = mb->vlan_tci;
 507
 508         q->sw_ring[q->next_free] = mb;
 509         q->hw_ring[q->next_free].buffer_addr =
 510                         rte_cpu_to_le_64(MBUF_DMA_ADDR(mb));
 511         q->hw_ring[q->next_free].buflen =
 512                         rte_cpu_to_le_16(rte_pktmbuf_data_len(mb));
 513
 514         if (mb->ol_flags & PKT_TX_TCP_SEG) {
 515                 hdrlen = mb->outer_l2_len + mb->outer_l3_len + mb->l2_len +
 516                         mb->l3_len + mb->l4_len;
 517                 if (q->hw_ring[q->next_free].flags & FM10K_TXD_FLAG_FTAG)
 518                         hdrlen += sizeof(struct fm10k_ftag);
 519
 520                 if (likely((hdrlen >= FM10K_TSO_MIN_HEADERLEN) &&
 521                                 (hdrlen <= FM10K_TSO_MAX_HEADERLEN) &&
 522                                 (mb->tso_segsz >= FM10K_TSO_MINMSS))) {
 523                         q->hw_ring[q->next_free].mss = mb->tso_segsz;
 524                         q->hw_ring[q->next_free].hdrlen = hdrlen;
 525                 }
 526         }
 527
 528         if (++q->next_free == q->nb_desc)
 529                 q->next_free = 0;
 530
 531         /* fill up the rings */
 532         for (mb = mb->next; mb != NULL; mb = mb->next) {
 533                 q->sw_ring[q->next_free] = mb;
 534                 q->hw_ring[q->next_free].buffer_addr =
 535                                 rte_cpu_to_le_64(MBUF_DMA_ADDR(mb));
 536                 q->hw_ring[q->next_free].buflen =
 537                                 rte_cpu_to_le_16(rte_pktmbuf_data_len(mb));
 538                 q->hw_ring[q->next_free].flags = 0;
 539                 if (++q->next_free == q->nb_desc)
 540                         q->next_free = 0;
 541         }
 542
 543         q->hw_ring[last_id].flags |= flags;
 544 }
 545
 546 uint16_t
 547 fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 548         uint16_t nb_pkts)
 549 {
 550         struct fm10k_tx_queue *q = tx_queue;
 551         struct rte_mbuf *mb;
 552         uint16_t count;
 553
 554         for (count = 0; count < nb_pkts; ++count) {
 555                 mb = tx_pkts[count];
 556
 557                 /* running low on descriptors? try to free some... */
 558                 if (q->nb_free < q->free_thresh)
 559                         tx_free_descriptors(q);
 560
 561                 /* make sure there are enough free descriptors to transmit the
 562                  * entire packet before doing anything */
 563                 if (q->nb_free < mb->nb_segs)
 564                         break;
 565
 566                 /* sanity check to make sure the mbuf is valid */
 567                 if ((mb->nb_segs == 0) ||
 568                     ((mb->nb_segs > 1) && (mb->next == NULL)))
 569                         break;
 570
 571                 /* process the packet */
 572                 tx_xmit_pkt(q, mb);
 573         }
 574
 575         /* update the tail pointer if any packets were processed */
 576         if (likely(count > 0))
 577                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_free);
 578
 579         return count;
 580 }
 581
 582 uint16_t
 583 fm10k_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 584                 uint16_t nb_pkts)
 585 {
 586         int i, ret;
 587         struct rte_mbuf *m;
 588
 589         for (i = 0; i < nb_pkts; i++) {
 590                 m = tx_pkts[i];
 591
 592                 if ((m->ol_flags & PKT_TX_TCP_SEG) &&
 593                                 (m->tso_segsz < FM10K_TSO_MINMSS)) {
 594                         rte_errno = -EINVAL;
 595                         return i;
 596                 }
 597
 598                 if (m->ol_flags & FM10K_TX_OFFLOAD_NOTSUP_MASK) {
 599                         rte_errno = -ENOTSUP;
 600                         return i;
 601                 }
 602
 603 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
 604                 ret = rte_validate_tx_offload(m);
 605                 if (ret != 0) {
 606                         rte_errno = ret;
 607                         return i;
 608                 }
 609 #endif
 610                 ret = rte_net_intel_cksum_prepare(m);
 611                 if (ret != 0) {
 612                         rte_errno = ret;
 613                         return i;
 614                 }
 615         }
 616
 617         return i;
 618 }