lib/librte_pmd_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 #include <rte_ethdev.h>
  34 #include <rte_common.h>
  35 #include "fm10k.h"
  36 #include "base/fm10k_type.h"
  37
  38 #ifdef RTE_PMD_PACKET_PREFETCH
  39 #define rte_packet_prefetch(p)  rte_prefetch1(p)
  40 #else
  41 #define rte_packet_prefetch(p)  do {} while (0)
  42 #endif
  43
  44 static inline void dump_rxd(union fm10k_rx_desc *rxd)
  45 {
  46 #ifndef RTE_LIBRTE_FM10K_DEBUG_RX
  47         RTE_SET_USED(rxd);
  48 #endif
  49         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  50         PMD_RX_LOG(DEBUG, "|     GLORT      | PKT HDR & TYPE |");
  51         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", rxd->d.glort,
  52                         rxd->d.data);
  53         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  54         PMD_RX_LOG(DEBUG, "|   VLAN & LEN   |     STATUS     |");
  55         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", rxd->d.vlan_len,
  56                         rxd->d.staterr);
  57         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  58         PMD_RX_LOG(DEBUG, "|    RESERVED    |    RSS_HASH    |");
  59         PMD_RX_LOG(DEBUG, "|   0x%08x   |   0x%08x   |", 0, rxd->d.rss);
  60         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  61         PMD_RX_LOG(DEBUG, "|            TIME TAG             |");
  62         PMD_RX_LOG(DEBUG, "|       0x%016lx        |", rxd->q.timestamp);
  63         PMD_RX_LOG(DEBUG, "+----------------|----------------+");
  64 }
  65
  66 static inline void
  67 rx_desc_to_ol_flags(struct rte_mbuf *m, const union fm10k_rx_desc *d)
  68 {
  69         uint16_t ptype;
  70         static const uint16_t pt_lut[] = { 0,
  71                 PKT_RX_IPV4_HDR, PKT_RX_IPV4_HDR_EXT,
  72                 PKT_RX_IPV6_HDR, PKT_RX_IPV6_HDR_EXT,
  73                 0, 0, 0
  74         };
  75
  76         if (d->w.pkt_info & FM10K_RXD_RSSTYPE_MASK)
  77                 m->ol_flags |= PKT_RX_RSS_HASH;
  78
  79         if (unlikely((d->d.staterr &
  80                 (FM10K_RXD_STATUS_IPCS | FM10K_RXD_STATUS_IPE)) ==
  81                 (FM10K_RXD_STATUS_IPCS | FM10K_RXD_STATUS_IPE)))
  82                 m->ol_flags |= PKT_RX_IP_CKSUM_BAD;
  83
  84         if (unlikely((d->d.staterr &
  85                 (FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)) ==
  86                 (FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)))
  87                 m->ol_flags |= PKT_RX_L4_CKSUM_BAD;
  88
  89         if (d->d.staterr & FM10K_RXD_STATUS_VEXT)
  90                 m->ol_flags |= PKT_RX_VLAN_PKT;
  91
  92         if (unlikely(d->d.staterr & FM10K_RXD_STATUS_HBO))
  93                 m->ol_flags |= PKT_RX_HBUF_OVERFLOW;
  94
  95         if (unlikely(d->d.staterr & FM10K_RXD_STATUS_RXE))
  96                 m->ol_flags |= PKT_RX_RECIP_ERR;
  97
  98         ptype = (d->d.data & FM10K_RXD_PKTTYPE_MASK_L3) >>
  99                                                 FM10K_RXD_PKTTYPE_SHIFT;
 100         m->ol_flags |= pt_lut[(uint8_t)ptype];
 101 }
 102
 103 uint16_t
 104 fm10k_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 105         uint16_t nb_pkts)
 106 {
 107         struct rte_mbuf *mbuf;
 108         union fm10k_rx_desc desc;
 109         struct fm10k_rx_queue *q = rx_queue;
 110         uint16_t count = 0;
 111         int alloc = 0;
 112         uint16_t next_dd;
 113         int ret;
 114
 115         next_dd = q->next_dd;
 116
 117         nb_pkts = RTE_MIN(nb_pkts, q->alloc_thresh);
 118         for (count = 0; count < nb_pkts; ++count) {
 119                 mbuf = q->sw_ring[next_dd];
 120                 desc = q->hw_ring[next_dd];
 121                 if (!(desc.d.staterr & FM10K_RXD_STATUS_DD))
 122                         break;
 123 #ifdef RTE_LIBRTE_FM10K_DEBUG_RX
 124                 dump_rxd(&desc);
 125 #endif
 126                 rte_pktmbuf_pkt_len(mbuf) = desc.w.length;
 127                 rte_pktmbuf_data_len(mbuf) = desc.w.length;
 128
 129                 mbuf->ol_flags = 0;
 130 #ifdef RTE_LIBRTE_FM10K_RX_OLFLAGS_ENABLE
 131                 rx_desc_to_ol_flags(mbuf, &desc);
 132 #endif
 133
 134                 mbuf->hash.rss = desc.d.rss;
 135
 136                 rx_pkts[count] = mbuf;
 137                 if (++next_dd == q->nb_desc) {
 138                         next_dd = 0;
 139                         alloc = 1;
 140                 }
 141
 142                 /* Prefetch next mbuf while processing current one. */
 143                 rte_prefetch0(q->sw_ring[next_dd]);
 144
 145                 /*
 146                  * When next RX descriptor is on a cache-line boundary,
 147                  * prefetch the next 4 RX descriptors and the next 8 pointers
 148                  * to mbufs.
 149                  */
 150                 if ((next_dd & 0x3) == 0) {
 151                         rte_prefetch0(&q->hw_ring[next_dd]);
 152                         rte_prefetch0(&q->sw_ring[next_dd]);
 153                 }
 154         }
 155
 156         q->next_dd = next_dd;
 157
 158         if ((q->next_dd > q->next_trigger) || (alloc == 1)) {
 159                 ret = rte_mempool_get_bulk(q->mp,
 160                                         (void **)&q->sw_ring[q->next_alloc],
 161                                         q->alloc_thresh);
 162
 163                 if (unlikely(ret != 0)) {
 164                         uint8_t port = q->port_id;
 165                         PMD_RX_LOG(ERR, "Failed to alloc mbuf");
 166                         /*
 167                          * Need to restore next_dd if we cannot allocate new
 168                          * buffers to replenish the old ones.
 169                          */
 170                         q->next_dd = (q->next_dd + q->nb_desc - count) %
 171                                                                 q->nb_desc;
 172                         rte_eth_devices[port].data->rx_mbuf_alloc_failed++;
 173                         return 0;
 174                 }
 175
 176                 for (; q->next_alloc <= q->next_trigger; ++q->next_alloc) {
 177                         mbuf = q->sw_ring[q->next_alloc];
 178
 179                         /* setup static mbuf fields */
 180                         fm10k_pktmbuf_reset(mbuf, q->port_id);
 181
 182                         /* write descriptor */
 183                         desc.q.pkt_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 184                         desc.q.hdr_addr = MBUF_DMA_ADDR_DEFAULT(mbuf);
 185                         q->hw_ring[q->next_alloc] = desc;
 186                 }
 187                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_trigger);
 188                 q->next_trigger += q->alloc_thresh;
 189                 if (q->next_trigger >= q->nb_desc) {
 190                         q->next_trigger = q->alloc_thresh - 1;
 191                         q->next_alloc = 0;
 192                 }
 193         }
 194
 195         return count;
 196 }
 197
 198 static inline void tx_free_descriptors(struct fm10k_tx_queue *q)
 199 {
 200         uint16_t next_rs, count = 0;
 201
 202         next_rs = fifo_peek(&q->rs_tracker);
 203         if (!(q->hw_ring[next_rs].flags & FM10K_TXD_FLAG_DONE))
 204                 return;
 205
 206         /* the DONE flag is set on this descriptor so remove the ID
 207          * from the RS bit tracker and free the buffers */
 208         fifo_remove(&q->rs_tracker);
 209
 210         /* wrap around? if so, free buffers from last_free up to but NOT
 211          * including nb_desc */
 212         if (q->last_free > next_rs) {
 213                 count = q->nb_desc - q->last_free;
 214                 while (q->last_free < q->nb_desc) {
 215                         rte_pktmbuf_free_seg(q->sw_ring[q->last_free]);
 216                         q->sw_ring[q->last_free] = NULL;
 217                         ++q->last_free;
 218                 }
 219                 q->last_free = 0;
 220         }
 221
 222         /* adjust free descriptor count before the next loop */
 223         q->nb_free += count + (next_rs + 1 - q->last_free);
 224
 225         /* free buffers from last_free, up to and including next_rs */
 226         while (q->last_free <= next_rs) {
 227                 rte_pktmbuf_free_seg(q->sw_ring[q->last_free]);
 228                 q->sw_ring[q->last_free] = NULL;
 229                 ++q->last_free;
 230         }
 231
 232         if (q->last_free == q->nb_desc)
 233                 q->last_free = 0;
 234 }
 235
 236 static inline void tx_xmit_pkt(struct fm10k_tx_queue *q, struct rte_mbuf *mb)
 237 {
 238         uint16_t last_id;
 239         uint8_t flags;
 240
 241         /* always set the LAST flag on the last descriptor used to
 242          * transmit the packet */
 243         flags = FM10K_TXD_FLAG_LAST;
 244         last_id = q->next_free + mb->nb_segs - 1;
 245         if (last_id >= q->nb_desc)
 246                 last_id = last_id - q->nb_desc;
 247
 248         /* but only set the RS flag on the last descriptor if rs_thresh
 249          * descriptors will be used since the RS flag was last set */
 250         if ((q->nb_used + mb->nb_segs) >= q->rs_thresh) {
 251                 flags |= FM10K_TXD_FLAG_RS;
 252                 fifo_insert(&q->rs_tracker, last_id);
 253                 q->nb_used = 0;
 254         } else {
 255                 q->nb_used = q->nb_used + mb->nb_segs;
 256         }
 257
 258         q->hw_ring[last_id].flags = flags;
 259         q->nb_free -= mb->nb_segs;
 260
 261         /* set checksum flags on first descriptor of packet. SCTP checksum
 262          * offload is not supported, but we do not explicitly check for this
 263          * case in favor of greatly simplified processing. */
 264         if (mb->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK))
 265                 q->hw_ring[q->next_free].flags |= FM10K_TXD_FLAG_CSUM;
 266
 267         /* set vlan if requested */
 268         if (mb->ol_flags & PKT_TX_VLAN_PKT)
 269                 q->hw_ring[q->next_free].vlan = mb->vlan_tci;
 270
 271         /* fill up the rings */
 272         for (; mb != NULL; mb = mb->next) {
 273                 q->sw_ring[q->next_free] = mb;
 274                 q->hw_ring[q->next_free].buffer_addr =
 275                                 rte_cpu_to_le_64(MBUF_DMA_ADDR(mb));
 276                 q->hw_ring[q->next_free].buflen =
 277                                 rte_cpu_to_le_16(rte_pktmbuf_data_len(mb));
 278                 if (++q->next_free == q->nb_desc)
 279                         q->next_free = 0;
 280         }
 281 }
 282
 283 uint16_t
 284 fm10k_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 285         uint16_t nb_pkts)
 286 {
 287         struct fm10k_tx_queue *q = tx_queue;
 288         struct rte_mbuf *mb;
 289         uint16_t count;
 290
 291         for (count = 0; count < nb_pkts; ++count) {
 292                 mb = tx_pkts[count];
 293
 294                 /* running low on descriptors? try to free some... */
 295                 if (q->nb_free < q->free_trigger)
 296                         tx_free_descriptors(q);
 297
 298                 /* make sure there are enough free descriptors to transmit the
 299                  * entire packet before doing anything */
 300                 if (q->nb_free < mb->nb_segs)
 301                         break;
 302
 303                 /* sanity check to make sure the mbuf is valid */
 304                 if ((mb->nb_segs == 0) ||
 305                     ((mb->nb_segs > 1) && (mb->next == NULL)))
 306                         break;
 307
 308                 /* process the packet */
 309                 tx_xmit_pkt(q, mb);
 310         }
 311
 312         /* update the tail pointer if any packets were processed */
 313         if (likely(count > 0))
 314                 FM10K_PCI_REG_WRITE(q->tail_ptr, q->next_free);
 315
 316         return count;
 317 }