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