drivers/net/fm10k/fm10k_rxtx.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   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  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <inttypes.h>
  35
  36 #include <rte_ethdev.h>
  37 #include <rte_common.h>
  38 #include "fm10k.h"
  39 #include "base/fm10k_type.h"
  40
  41 #ifdef RTE_PMD_PACKET_PREFETCH
  42 #define rte_packet_prefetch(p)  rte_prefetch1(p)
  43 #else
  44 #define rte_packet_prefetch(p)  do {} while (0)
  45 #endif
  46
  47 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
  48 static inline void dump_rxd(union fm10k_rx_desc *rxd)
  49 {
  50         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  51         PMD_RX_LOG(DEBUG, "|     GLORT      | PKT HDR & TYPE |");
  52         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", rxd->d.glort,
  53                         rxd->d.data);
  54         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  55         PMD_RX_LOG(DEBUG, "|   VLAN & LEN   |     STATUS     |");
  56         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", rxd->d.vlan_len,
  57                         rxd->d.staterr);
  58         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  59         PMD_RX_LOG(DEBUG, "|    RESERVED    |    RSS_HASH    |");
  60         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", 0, rxd->d.rss);
  61         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  62         PMD_RX_LOG(DEBUG, "|            TIME TAG             |");
  63         PMD_RX_LOG(DEBUG, "|       0x%016"PRIx64"        |", rxd->q.timestamp);
  64         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  65 }
  66 #endif
  67
  68 static inline void
  69 rx_desc_to_ol_flags(struct rte_mbuf *m, const union fm10k_rx_desc *d)
  70 {
  71         static const uint32_t
  72                 ptype_table[FM10K_RXD_PKTTYPE_MASK >> FM10K_RXD_PKTTYPE_SHIFT]
  73                         __rte_cache_aligned = {
  74                 [FM10K_PKTTYPE_OTHER] = RTE_PTYPE_L2_ETHER,
  75                 [FM10K_PKTTYPE_IPV4] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV4,
  76                 [FM10K_PKTTYPE_IPV4_EX] = RTE_PTYPE_L2_ETHER |
  77                         RTE_PTYPE_L3_IPV4_EXT,
  78                 [FM10K_PKTTYPE_IPV6] = RTE_PTYPE_L2_ETHER | RTE_PTYPE_L3_IPV6,
  79                 [FM10K_PKTTYPE_IPV6_EX] = RTE_PTYPE_L2_ETHER |
  80                         RTE_PTYPE_L3_IPV6_EXT,
  81                 [FM10K_PKTTYPE_IPV4 | FM10K_PKTTYPE_TCP] = RTE_PTYPE_L2_ETHER |
  82                         RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L4_TCP,
  83                 [FM10K_PKTTYPE_IPV6 | FM10K_PKTTYPE_TCP] = RTE_PTYPE_L2_ETHER |
  84                         RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_TCP,
  85                 [FM10K_PKTTYPE_IPV4 | FM10K_PKTTYPE_UDP] = RTE_PTYPE_L2_ETHER |
  86                         RTE_PTYPE_L3_IPV4 | RTE_PTYPE_L4_UDP,
  87                 [FM10K_PKTTYPE_IPV6 | FM10K_PKTTYPE_UDP] = RTE_PTYPE_L2_ETHER |
  88                         RTE_PTYPE_L3_IPV6 | RTE_PTYPE_L4_UDP,
  89         };
  90
  91         m->packet_type = ptype_table[(d->w.pkt_info & FM10K_RXD_PKTTYPE_MASK)
  92                                                 >> FM10K_RXD_PKTTYPE_SHIFT];
  93
  94         if (d->w.pkt_info & FM10K_RXD_RSSTYPE_MASK)
  95                 m->ol_flags |= PKT_RX_RSS_HASH;
  96
  97         if (unlikely((d->d.staterr &
  98                 (FM10K_RXD_STATUS_IPCS | FM10K_RXD_STATUS_IPE)) ==
  99                 (FM10K_RXD_STATUS_IPCS | FM10K_RXD_STATUS_IPE)))
 100                 m->ol_flags |= PKT_RX_IP_CKSUM_BAD;
 101
 102         if (unlikely((d->d.staterr &
 103                 (FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)) ==
 104                 (FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)))
 105                 m->ol_flags |= PKT_RX_L4_CKSUM_BAD;
 106
 107         if (unlikely(d->d.staterr & FM10K_RXD_STATUS_HBO))
 108                 m->ol_flags |= PKT_RX_HBUF_OVERFLOW;
 109
 110         if (unlikely(d->d.staterr & FM10K_RXD_STATUS_RXE))
 111                 m->ol_flags |= PKT_RX_RECIP_ERR;
 112 }
 113
 114 uint16_t
 115 fm10k_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 116         uint16_t nb_pkts)
 117 {
 118         struct rte_mbuf *mbuf;
 119         union fm10k_rx_desc desc;
 120         struct fm10k_rx_queue *q = rx_queue;
 121         uint16_t count = 0;
 122         int alloc = 0;
 123         uint16_t next_dd;
 124         int ret;
 125
 126         next_dd = q->next_dd;
 127
 128         nb_pkts = RTE_MIN(nb_pkts, q->alloc_thresh);
 129         for (count = 0; count < nb_pkts; ++count) {
 130                 mbuf = q->sw_ring[next_dd];
 131                 desc = q->hw_ring[next_dd];
 132                 if (!(desc.d.staterr & FM10K_RXD_STATUS_DD))
 133                         break;
 134 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
 135                 dump_rxd(&desc);
 136 #endif
 137                 rte_pktmbuf_pkt_len(mbuf) = desc.w.length;
 138                 rte_pktmbuf_data_len(mbuf) = desc.w.length;
 139
 140                 mbuf->ol_flags = 0;
 141 #ifdef RTE_LIBRTE_FM10K_RX_OLFLAGS_ENABLE
 142                 rx_desc_to_ol_flags(mbuf, &desc);
 143 #endif
 144
 145                 mbuf->hash.rss = desc.d.rss;
 146                 /**
 147                  * Packets in fm10k device always carry at least one VLAN tag.
 148                  * For those packets coming in without VLAN tag,
 149                  * the port default VLAN tag will be used.
 150                  * So, always PKT_RX_VLAN_PKT flag is set and vlan_tci
 151                  * is valid for each RX packet's mbuf.
 152                  */
 153                 mbuf->ol_flags |= PKT_RX_VLAN_PKT;
 154                 mbuf->vlan_tci = desc.w.vlan;
 155                 /**
 156                  * mbuf->vlan_tci_outer is an idle field in fm10k driver,
 157                  * so it can be selected to store sglort value.
 158                  */
 159                 if (q->rx_ftag_en)
 160                         mbuf->vlan_tci_outer = rte_le_to_cpu_16(desc.w.sglort);
 161
 162                 rx_pkts[count] = mbuf;
 163                 if (++next_dd == q->nb_desc) {
 164                         next_dd = 0;
 165                         alloc = 1;
 166                 }
 167
 168                 /* Prefetch next mbuf while processing current one. */
 169                 rte_prefetch0(q->sw_ring[next_dd]);
 170
 171                 /*
 172                  * When next RX descriptor is on a cache-line boundary,
 173                  * prefetch the next 4 RX descriptors and the next 8 pointers
 174                  * to mbufs.
 175                  */
 176                 if ((next_dd & 0x3) == 0) {
 177                         rte_prefetch0(&q->hw_ring[next_dd]);
 178                         rte_prefetch0(&q->sw_ring[next_dd]);
 179                 }
 180         }
 181
 182         q->next_dd = next_dd;
 183
 184         if ((q->next_dd > q->next_trigger) || (alloc == 1)) {
 185                 ret = rte_mempool_get_bulk(q->mp,
 186                                         (void **)&q->sw_ring[q->next_alloc],
 187                                         q->alloc_thresh);
 188
 189                 if (unlikely(ret != 0)) {
 190                         uint8_t port = q->port_id;
 191                         PMD_RX_LOG(ERR, "Failed to alloc mbuf");
 192                         /*
 193                          * Need to restore next_dd if we cannot allocate new
 194                          * buffers to replenish the old ones.
 195                          */
 196                         q->next_dd = (q->next_dd + q->nb_desc - count) %
 197                                                                 q->nb_desc;
 198                         rte_eth_devices[port].data->rx_mbuf_alloc_failed++;
 199                         return 0;
 200                 }
 201
 202                 for (; q->next_alloc <= q->next_trigger; ++q->next_alloc) {
 203                         mbuf = q->sw_ring[q->next_alloc];
 204
 205                         /* setup static mbuf fields */
 206                         fm10k_pktmbuf_reset(mbuf, q->port_id);
 207
 208                         /* write descriptor */
 209                         desc.q.pkt_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 210                         desc.q.hdr_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 211                         q->hw_ring[q->next_alloc] = desc;
 212                 }
 213                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_trigger);
 214                 q->next_trigger += q->alloc_thresh;
 215                 if (q->next_trigger >= q->nb_desc) {
 216                         q->next_trigger = q->alloc_thresh - 1;
 217                         q->next_alloc = 0;
 218                 }
 219         }
 220
 221         return count;
 222 }
 223
 224 uint16_t
 225 fm10k_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 226                                 uint16_t nb_pkts)
 227 {
 228         struct rte_mbuf *mbuf;
 229         union fm10k_rx_desc desc;
 230         struct fm10k_rx_queue *q = rx_queue;
 231         uint16_t count = 0;
 232         uint16_t nb_rcv, nb_seg;
 233         int alloc = 0;
 234         uint16_t next_dd;
 235         struct rte_mbuf *first_seg = q->pkt_first_seg;
 236         struct rte_mbuf *last_seg = q->pkt_last_seg;
 237         int ret;
 238
 239         next_dd = q->next_dd;
 240         nb_rcv = 0;
 241
 242         nb_seg = RTE_MIN(nb_pkts, q->alloc_thresh);
 243         for (count = 0; count < nb_seg; count++) {
 244                 mbuf = q->sw_ring[next_dd];
 245                 desc = q->hw_ring[next_dd];
 246                 if (!(desc.d.staterr & FM10K_RXD_STATUS_DD))
 247                         break;
 248 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
 249                 dump_rxd(&desc);
 250 #endif
 251
 252                 if (++next_dd == q->nb_desc) {
 253                         next_dd = 0;
 254                         alloc = 1;
 255                 }
 256
 257                 /* Prefetch next mbuf while processing current one. */
 258                 rte_prefetch0(q->sw_ring[next_dd]);
 259
 260                 /*
 261                  * When next RX descriptor is on a cache-line boundary,
 262                  * prefetch the next 4 RX descriptors and the next 8 pointers
 263                  * to mbufs.
 264                  */
 265                 if ((next_dd & 0x3) == 0) {
 266                         rte_prefetch0(&q->hw_ring[next_dd]);
 267                         rte_prefetch0(&q->sw_ring[next_dd]);
 268                 }
 269
 270                 /* Fill data length */
 271                 rte_pktmbuf_data_len(mbuf) = desc.w.length;
 272
 273                 /*
 274                  * If this is the first buffer of the received packet,
 275                  * set the pointer to the first mbuf of the packet and
 276                  * initialize its context.
 277                  * Otherwise, update the total length and the number of segments
 278                  * of the current scattered packet, and update the pointer to
 279                  * the last mbuf of the current packet.
 280                  */
 281                 if (!first_seg) {
 282                         first_seg = mbuf;
 283                         first_seg->pkt_len = desc.w.length;
 284                 } else {
 285                         first_seg->pkt_len =
 286                                         (uint16_t)(first_seg->pkt_len +
 287                                         rte_pktmbuf_data_len(mbuf));
 288                         first_seg->nb_segs++;
 289                         last_seg->next = mbuf;
 290                 }
 291
 292                 /*
 293                  * If this is not the last buffer of the received packet,
 294                  * update the pointer to the last mbuf of the current scattered
 295                  * packet and continue to parse the RX ring.
 296                  */
 297                 if (!(desc.d.staterr & FM10K_RXD_STATUS_EOP)) {
 298                         last_seg = mbuf;
 299                         continue;
 300                 }
 301
 302                 first_seg->ol_flags = 0;
 303 #ifdef RTE_LIBRTE_FM10K_RX_OLFLAGS_ENABLE
 304                 rx_desc_to_ol_flags(first_seg, &desc);
 305 #endif
 306                 first_seg->hash.rss = desc.d.rss;
 307                 /**
 308                  * Packets in fm10k device always carry at least one VLAN tag.
 309                  * For those packets coming in without VLAN tag,
 310                  * the port default VLAN tag will be used.
 311                  * So, always PKT_RX_VLAN_PKT flag is set and vlan_tci
 312                  * is valid for each RX packet's mbuf.
 313                  */
 314                 first_seg->ol_flags |= PKT_RX_VLAN_PKT;
 315                 first_seg->vlan_tci = desc.w.vlan;
 316                 /**
 317                  * mbuf->vlan_tci_outer is an idle field in fm10k driver,
 318                  * so it can be selected to store sglort value.
 319                  */
 320                 if (q->rx_ftag_en)
 321                         first_seg->vlan_tci_outer =
 322                                 rte_le_to_cpu_16(desc.w.sglort);
 323
 324                 /* Prefetch data of first segment, if configured to do so. */
 325                 rte_packet_prefetch((char *)first_seg->buf_addr +
 326                         first_seg->data_off);
 327
 328                 /*
 329                  * Store the mbuf address into the next entry of the array
 330                  * of returned packets.
 331                  */
 332                 rx_pkts[nb_rcv++] = first_seg;
 333
 334                 /*
 335                  * Setup receipt context for a new packet.
 336                  */
 337                 first_seg = NULL;
 338         }
 339
 340         q->next_dd = next_dd;
 341
 342         if ((q->next_dd > q->next_trigger) || (alloc == 1)) {
 343                 ret = rte_mempool_get_bulk(q->mp,
 344                                         (void **)&q->sw_ring[q->next_alloc],
 345                                         q->alloc_thresh);
 346
 347                 if (unlikely(ret != 0)) {
 348                         uint8_t port = q->port_id;
 349                         PMD_RX_LOG(ERR, "Failed to alloc mbuf");
 350                         /*
 351                          * Need to restore next_dd if we cannot allocate new
 352                          * buffers to replenish the old ones.
 353                          */
 354                         q->next_dd = (q->next_dd + q->nb_desc - count) %
 355                                                                 q->nb_desc;
 356                         rte_eth_devices[port].data->rx_mbuf_alloc_failed++;
 357                         return 0;
 358                 }
 359
 360                 for (; q->next_alloc <= q->next_trigger; ++q->next_alloc) {
 361                         mbuf = q->sw_ring[q->next_alloc];
 362
 363                         /* setup static mbuf fields */
 364                         fm10k_pktmbuf_reset(mbuf, q->port_id);
 365
 366                         /* write descriptor */
 367                         desc.q.pkt_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 368                         desc.q.hdr_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 369                         q->hw_ring[q->next_alloc] = desc;
 370                 }
 371                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_trigger);
 372                 q->next_trigger += q->alloc_thresh;
 373                 if (q->next_trigger >= q->nb_desc) {
 374                         q->next_trigger = q->alloc_thresh - 1;
 375                         q->next_alloc = 0;
 376                 }
 377         }
 378
 379         q->pkt_first_seg = first_seg;
 380         q->pkt_last_seg = last_seg;
 381
 382         return nb_rcv;
 383 }
 384
 385 int
 386 fm10k_dev_rx_descriptor_done(void *rx_queue, uint16_t offset)
 387 {
 388         volatile union fm10k_rx_desc *rxdp;
 389         struct fm10k_rx_queue *rxq = rx_queue;
 390         uint16_t desc;
 391         int ret;
 392
 393         if (unlikely(offset >= rxq->nb_desc)) {
 394                 PMD_DRV_LOG(ERR, "Invalid RX descriptor offset %u", offset);
 395                 return 0;
 396         }
 397
 398         desc = rxq->next_dd + offset;
 399         if (desc >= rxq->nb_desc)
 400                 desc -= rxq->nb_desc;
 401
 402         rxdp = &rxq->hw_ring[desc];
 403
 404         ret = !!(rxdp->w.status &
 405                         rte_cpu_to_le_16(FM10K_RXD_STATUS_DD));
 406
 407         return ret;
 408 }
 409
 410 /*
 411  * Free multiple TX mbuf at a time if they are in the same pool
 412  *
 413  * @txep: software desc ring index that starts to free
 414  * @num: number of descs to free
 415  *
 416  */
 417 static inline void tx_free_bulk_mbuf(struct rte_mbuf **txep, int num)
 418 {
 419         struct rte_mbuf *m, *free[RTE_FM10K_TX_MAX_FREE_BUF_SZ];
 420         int i;
 421         int nb_free = 0;
 422
 423         if (unlikely(num == 0))
 424                 return;
 425
 426         m = __rte_pktmbuf_prefree_seg(txep[0]);
 427         if (likely(m != NULL)) {
 428                 free[0] = m;
 429                 nb_free = 1;
 430                 for (i = 1; i < num; i++) {
 431                         m = __rte_pktmbuf_prefree_seg(txep[i]);
 432                         if (likely(m != NULL)) {
 433                                 if (likely(m->pool == free[0]->pool))
 434                                         free[nb_free++] = m;
 435                                 else {
 436                                         rte_mempool_put_bulk(free[0]->pool,
 437                                                         (void *)free, nb_free);
 438                                         free[0] = m;
 439                                         nb_free = 1;
 440                                 }
 441                         }
 442                         txep[i] = NULL;
 443                 }
 444                 rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free);
 445         } else {
 446                 for (i = 1; i < num; i++) {
 447                         m = __rte_pktmbuf_prefree_seg(txep[i]);
 448                         if (m != NULL)
 449                                 rte_mempool_put(m->pool, m);
 450                         txep[i] = NULL;
 451                 }
 452         }
 453 }
 454
 455 static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
 456 {
 457         uint16_t next_rs, count = 0;
 458
 459         next_rs = fifo_peek(&q->rs_tracker);
 460         if (!(q->hw_ring[next_rs].flags & FM10K_TXD_FLAG_DONE))
 461                 return;
 462
 463         /* the DONE flag is set on this descriptor so remove the ID
 464          * from the RS bit tracker and free the buffers */
 465         fifo_remove(&q->rs_tracker);
 466
 467         /* wrap around? if so, free buffers from last_free up to but NOT
 468          * including nb_desc */
 469         if (q->last_free > next_rs) {
 470                 count = q->nb_desc - q->last_free;
 471                 tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
 472                 q->last_free = 0;
 473         }
 474
 475         /* adjust free descriptor count before the next loop */
 476         q->nb_free += count + (next_rs + 1 - q->last_free);
 477
 478         /* free buffers from last_free, up to and including next_rs */
 479         if (q->last_free <= next_rs) {
 480                 count = next_rs - q->last_free + 1;
 481                 tx_free_bulk_mbuf(&q->sw_ring[q->last_free], count);
 482                 q->last_free += count;
 483         }
 484
 485         if (q->last_free == q->nb_desc)
 486                 q->last_free = 0;
 487 }
 488
 489 static inline void tx_xmit_pkt(struct fm10k_tx_queue *q, struct rte_mbuf *mb)
 490 {
 491         uint16_t last_id;
 492         uint8_t flags, hdrlen;
 493
 494         /* always set the LAST flag on the last descriptor used to
 495          * transmit the packet */
 496         flags = FM10K_TXD_FLAG_LAST;
 497         last_id = q->next_free + mb->nb_segs - 1;
 498         if (last_id >= q->nb_desc)
 499                 last_id = last_id - q->nb_desc;
 500
 501         /* but only set the RS flag on the last descriptor if rs_thresh
 502          * descriptors will be used since the RS flag was last set */
 503         if ((q->nb_used + mb->nb_segs) >= q->rs_thresh) {
 504                 flags |= FM10K_TXD_FLAG_RS;
 505                 fifo_insert(&q->rs_tracker, last_id);
 506                 q->nb_used = 0;
 507         } else {
 508                 q->nb_used = q->nb_used + mb->nb_segs;
 509         }
 510
 511         q->nb_free -= mb->nb_segs;
 512
 513         q->hw_ring[q->next_free].flags = 0;
 514         if (q->tx_ftag_en)
 515                 q->hw_ring[q->next_free].flags |= FM10K_TXD_FLAG_FTAG;
 516         /* set checksum flags on first descriptor of packet. SCTP checksum
 517          * offload is not supported, but we do not explicitly check for this
 518          * case in favor of greatly simplified processing. */
 519         if (mb->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
 520                 q->hw_ring[q->next_free].flags |= FM10K_TXD_FLAG_CSUM;
 521
 522         /* set vlan if requested */
 523         if (mb->ol_flags & PKT_TX_VLAN_PKT)
 524                 q->hw_ring[q->next_free].vlan = mb->vlan_tci;
 525
 526         q->sw_ring[q->next_free] = mb;
 527         q->hw_ring[q->next_free].buffer_addr =
 528                         rte_cpu_to_le_64(MBUF_DMA_ADDR(mb));
 529         q->hw_ring[q->next_free].buflen =
 530                         rte_cpu_to_le_16(rte_pktmbuf_data_len(mb));
 531
 532         if (mb->ol_flags & PKT_TX_TCP_SEG) {
 533                 hdrlen = mb->outer_l2_len + mb->outer_l3_len + mb->l2_len +
 534                         mb->l3_len + mb->l4_len;
 535                 if (q->hw_ring[q->next_free].flags & FM10K_TXD_FLAG_FTAG)
 536                         hdrlen += sizeof(struct fm10k_ftag);
 537
 538                 if (likely((hdrlen >= FM10K_TSO_MIN_HEADERLEN) &&
 539                                 (hdrlen <= FM10K_TSO_MAX_HEADERLEN) &&
 540                                 (mb->tso_segsz >= FM10K_TSO_MINMSS))) {
 541                         q->hw_ring[q->next_free].mss = mb->tso_segsz;
 542                         q->hw_ring[q->next_free].hdrlen = hdrlen;
 543                 }
 544         }
 545
 546         if (++q->next_free == q->nb_desc)
 547                 q->next_free = 0;
 548
 549         /* fill up the rings */
 550         for (mb = mb->next; mb != NULL; mb = mb->next) {
 551                 q->sw_ring[q->next_free] = mb;
 552                 q->hw_ring[q->next_free].buffer_addr =
 553                                 rte_cpu_to_le_64(MBUF_DMA_ADDR(mb));
 554                 q->hw_ring[q->next_free].buflen =
 555                                 rte_cpu_to_le_16(rte_pktmbuf_data_len(mb));
 556                 q->hw_ring[q->next_free].flags = 0;
 557                 if (++q->next_free == q->nb_desc)
 558                         q->next_free = 0;
 559         }
 560
 561         q->hw_ring[last_id].flags |= flags;
 562 }
 563
 564 uint16_t
 565 fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 566         uint16_t nb_pkts)
 567 {
 568         struct fm10k_tx_queue *q = tx_queue;
 569         struct rte_mbuf *mb;
 570         uint16_t count;
 571
 572         for (count = 0; count < nb_pkts; ++count) {
 573                 mb = tx_pkts[count];
 574
 575                 /* running low on descriptors? try to free some... */
 576                 if (q->nb_free < q->free_thresh)
 577                         tx_free_descriptors(q);
 578
 579                 /* make sure there are enough free descriptors to transmit the
 580                  * entire packet before doing anything */
 581                 if (q->nb_free < mb->nb_segs)
 582                         break;
 583
 584                 /* sanity check to make sure the mbuf is valid */
 585                 if ((mb->nb_segs == 0) ||
 586                     ((mb->nb_segs > 1) && (mb->next == NULL)))
 587                         break;
 588
 589                 /* process the packet */
 590                 tx_xmit_pkt(q, mb);
 591         }
 592
 593         /* update the tail pointer if any packets were processed */
 594         if (likely(count > 0))
 595                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_free);
 596
 597         return count;
 598 }