lib/librte_pmd_e1000/igb_rxtx.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 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 <sys/queue.h>
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <errno.h>
  40 #include <stdint.h>
  41 #include <stdarg.h>
  42 #include <inttypes.h>
  43
  44 #include <rte_interrupts.h>
  45 #include <rte_byteorder.h>
  46 #include <rte_common.h>
  47 #include <rte_log.h>
  48 #include <rte_debug.h>
  49 #include <rte_pci.h>
  50 #include <rte_memory.h>
  51 #include <rte_memcpy.h>
  52 #include <rte_memzone.h>
  53 #include <rte_launch.h>
  54 #include <rte_tailq.h>
  55 #include <rte_eal.h>
  56 #include <rte_per_lcore.h>
  57 #include <rte_lcore.h>
  58 #include <rte_atomic.h>
  59 #include <rte_branch_prediction.h>
  60 #include <rte_ring.h>
  61 #include <rte_mempool.h>
  62 #include <rte_malloc.h>
  63 #include <rte_mbuf.h>
  64 #include <rte_ether.h>
  65 #include <rte_ethdev.h>
  66 #include <rte_prefetch.h>
  67 #include <rte_udp.h>
  68 #include <rte_tcp.h>
  69 #include <rte_sctp.h>
  70 #include <rte_string_fns.h>
  71
  72 #include "e1000_logs.h"
  73 #include "e1000/e1000_api.h"
  74 #include "e1000_ethdev.h"
  75
  76 #define IGB_RSS_OFFLOAD_ALL ( \
  77                 ETH_RSS_IPV4 | \
  78                 ETH_RSS_IPV4_TCP | \
  79                 ETH_RSS_IPV6 | \
  80                 ETH_RSS_IPV6_EX | \
  81                 ETH_RSS_IPV6_TCP | \
  82                 ETH_RSS_IPV6_TCP_EX | \
  83                 ETH_RSS_IPV4_UDP | \
  84                 ETH_RSS_IPV6_UDP | \
  85                 ETH_RSS_IPV6_UDP_EX)
  86
  87 static inline struct rte_mbuf *
  88 rte_rxmbuf_alloc(struct rte_mempool *mp)
  89 {
  90         struct rte_mbuf *m;
  91
  92         m = __rte_mbuf_raw_alloc(mp);
  93         __rte_mbuf_sanity_check_raw(m, 0);
  94         return (m);
  95 }
  96
  97 #define RTE_MBUF_DATA_DMA_ADDR(mb) \
  98         (uint64_t) ((mb)->buf_physaddr + (mb)->data_off)
  99
 100 #define RTE_MBUF_DATA_DMA_ADDR_DEFAULT(mb) \
 101         (uint64_t) ((mb)->buf_physaddr + RTE_PKTMBUF_HEADROOM)
 102
 103 /**
 104  * Structure associated with each descriptor of the RX ring of a RX queue.
 105  */
 106 struct igb_rx_entry {
 107         struct rte_mbuf *mbuf; /**< mbuf associated with RX descriptor. */
 108 };
 109
 110 /**
 111  * Structure associated with each descriptor of the TX ring of a TX queue.
 112  */
 113 struct igb_tx_entry {
 114         struct rte_mbuf *mbuf; /**< mbuf associated with TX desc, if any. */
 115         uint16_t next_id; /**< Index of next descriptor in ring. */
 116         uint16_t last_id; /**< Index of last scattered descriptor. */
 117 };
 118
 119 /**
 120  * Structure associated with each RX queue.
 121  */
 122 struct igb_rx_queue {
 123         struct rte_mempool  *mb_pool;   /**< mbuf pool to populate RX ring. */
 124         volatile union e1000_adv_rx_desc *rx_ring; /**< RX ring virtual address. */
 125         uint64_t            rx_ring_phys_addr; /**< RX ring DMA address. */
 126         volatile uint32_t   *rdt_reg_addr; /**< RDT register address. */
 127         volatile uint32_t   *rdh_reg_addr; /**< RDH register address. */
 128         struct igb_rx_entry *sw_ring;   /**< address of RX software ring. */
 129         struct rte_mbuf *pkt_first_seg; /**< First segment of current packet. */
 130         struct rte_mbuf *pkt_last_seg;  /**< Last segment of current packet. */
 131         uint16_t            nb_rx_desc; /**< number of RX descriptors. */
 132         uint16_t            rx_tail;    /**< current value of RDT register. */
 133         uint16_t            nb_rx_hold; /**< number of held free RX desc. */
 134         uint16_t            rx_free_thresh; /**< max free RX desc to hold. */
 135         uint16_t            queue_id;   /**< RX queue index. */
 136         uint16_t            reg_idx;    /**< RX queue register index. */
 137         uint8_t             port_id;    /**< Device port identifier. */
 138         uint8_t             pthresh;    /**< Prefetch threshold register. */
 139         uint8_t             hthresh;    /**< Host threshold register. */
 140         uint8_t             wthresh;    /**< Write-back threshold register. */
 141         uint8_t             crc_len;    /**< 0 if CRC stripped, 4 otherwise. */
 142         uint8_t             drop_en;  /**< If not 0, set SRRCTL.Drop_En. */
 143 };
 144
 145 /**
 146  * Hardware context number
 147  */
 148 enum igb_advctx_num {
 149         IGB_CTX_0    = 0, /**< CTX0    */
 150         IGB_CTX_1    = 1, /**< CTX1    */
 151         IGB_CTX_NUM  = 2, /**< CTX_NUM */
 152 };
 153
 154 /** Offload features */
 155 union igb_vlan_macip {
 156         uint32_t data;
 157         struct {
 158                 uint16_t l2_l3_len; /**< 7bit L2 and 9b L3 lengths combined */
 159                 uint16_t vlan_tci;
 160                 /**< VLAN Tag Control Identifier (CPU order). */
 161         } f;
 162 };
 163
 164 /*
 165  * Compare mask for vlan_macip_len.data,
 166  * should be in sync with igb_vlan_macip.f layout.
 167  * */
 168 #define TX_VLAN_CMP_MASK        0xFFFF0000  /**< VLAN length - 16-bits. */
 169 #define TX_MAC_LEN_CMP_MASK     0x0000FE00  /**< MAC length - 7-bits. */
 170 #define TX_IP_LEN_CMP_MASK      0x000001FF  /**< IP  length - 9-bits. */
 171 /** MAC+IP  length. */
 172 #define TX_MACIP_LEN_CMP_MASK   (TX_MAC_LEN_CMP_MASK | TX_IP_LEN_CMP_MASK)
 173
 174 /**
 175  * Strucutre to check if new context need be built
 176  */
 177 struct igb_advctx_info {
 178         uint64_t flags;           /**< ol_flags related to context build. */
 179         uint32_t cmp_mask;        /**< compare mask for vlan_macip_lens */
 180         union igb_vlan_macip vlan_macip_lens; /**< vlan, mac & ip length. */
 181 };
 182
 183 /**
 184  * Structure associated with each TX queue.
 185  */
 186 struct igb_tx_queue {
 187         volatile union e1000_adv_tx_desc *tx_ring; /**< TX ring address */
 188         uint64_t               tx_ring_phys_addr; /**< TX ring DMA address. */
 189         struct igb_tx_entry    *sw_ring; /**< virtual address of SW ring. */
 190         volatile uint32_t      *tdt_reg_addr; /**< Address of TDT register. */
 191         uint32_t               txd_type;      /**< Device-specific TXD type */
 192         uint16_t               nb_tx_desc;    /**< number of TX descriptors. */
 193         uint16_t               tx_tail; /**< Current value of TDT register. */
 194         uint16_t               tx_head;
 195         /**< Index of first used TX descriptor. */
 196         uint16_t               queue_id; /**< TX queue index. */
 197         uint16_t               reg_idx;  /**< TX queue register index. */
 198         uint8_t                port_id;  /**< Device port identifier. */
 199         uint8_t                pthresh;  /**< Prefetch threshold register. */
 200         uint8_t                hthresh;  /**< Host threshold register. */
 201         uint8_t                wthresh;  /**< Write-back threshold register. */
 202         uint32_t               ctx_curr;
 203         /**< Current used hardware descriptor. */
 204         uint32_t               ctx_start;
 205         /**< Start context position for transmit queue. */
 206         struct igb_advctx_info ctx_cache[IGB_CTX_NUM];
 207         /**< Hardware context history.*/
 208 };
 209
 210 #if 1
 211 #define RTE_PMD_USE_PREFETCH
 212 #endif
 213
 214 #ifdef RTE_PMD_USE_PREFETCH
 215 #define rte_igb_prefetch(p)     rte_prefetch0(p)
 216 #else
 217 #define rte_igb_prefetch(p)     do {} while(0)
 218 #endif
 219
 220 #ifdef RTE_PMD_PACKET_PREFETCH
 221 #define rte_packet_prefetch(p) rte_prefetch1(p)
 222 #else
 223 #define rte_packet_prefetch(p)  do {} while(0)
 224 #endif
 225
 226 /*
 227  * Macro for VMDq feature for 1 GbE NIC.
 228  */
 229 #define E1000_VMOLR_SIZE                        (8)
 230
 231 /*********************************************************************
 232  *
 233  *  TX function
 234  *
 235  **********************************************************************/
 236
 237 /*
 238  * Advanced context descriptor are almost same between igb/ixgbe
 239  * This is a separate function, looking for optimization opportunity here
 240  * Rework required to go with the pre-defined values.
 241  */
 242
 243 static inline void
 244 igbe_set_xmit_ctx(struct igb_tx_queue* txq,
 245                 volatile struct e1000_adv_tx_context_desc *ctx_txd,
 246                 uint64_t ol_flags, uint32_t vlan_macip_lens)
 247 {
 248         uint32_t type_tucmd_mlhl;
 249         uint32_t mss_l4len_idx;
 250         uint32_t ctx_idx, ctx_curr;
 251         uint32_t cmp_mask;
 252
 253         ctx_curr = txq->ctx_curr;
 254         ctx_idx = ctx_curr + txq->ctx_start;
 255
 256         cmp_mask = 0;
 257         type_tucmd_mlhl = 0;
 258
 259         if (ol_flags & PKT_TX_VLAN_PKT) {
 260                 cmp_mask |= TX_VLAN_CMP_MASK;
 261         }
 262
 263         if (ol_flags & PKT_TX_IP_CKSUM) {
 264                 type_tucmd_mlhl = E1000_ADVTXD_TUCMD_IPV4;
 265                 cmp_mask |= TX_MAC_LEN_CMP_MASK;
 266         }
 267
 268         /* Specify which HW CTX to upload. */
 269         mss_l4len_idx = (ctx_idx << E1000_ADVTXD_IDX_SHIFT);
 270         switch (ol_flags & PKT_TX_L4_MASK) {
 271         case PKT_TX_UDP_CKSUM:
 272                 type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_UDP |
 273                                 E1000_ADVTXD_DTYP_CTXT | E1000_ADVTXD_DCMD_DEXT;
 274                 mss_l4len_idx |= sizeof(struct udp_hdr) << E1000_ADVTXD_L4LEN_SHIFT;
 275                 cmp_mask |= TX_MACIP_LEN_CMP_MASK;
 276                 break;
 277         case PKT_TX_TCP_CKSUM:
 278                 type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_TCP |
 279                                 E1000_ADVTXD_DTYP_CTXT | E1000_ADVTXD_DCMD_DEXT;
 280                 mss_l4len_idx |= sizeof(struct tcp_hdr) << E1000_ADVTXD_L4LEN_SHIFT;
 281                 cmp_mask |= TX_MACIP_LEN_CMP_MASK;
 282                 break;
 283         case PKT_TX_SCTP_CKSUM:
 284                 type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_SCTP |
 285                                 E1000_ADVTXD_DTYP_CTXT | E1000_ADVTXD_DCMD_DEXT;
 286                 mss_l4len_idx |= sizeof(struct sctp_hdr) << E1000_ADVTXD_L4LEN_SHIFT;
 287                 cmp_mask |= TX_MACIP_LEN_CMP_MASK;
 288                 break;
 289         default:
 290                 type_tucmd_mlhl |= E1000_ADVTXD_TUCMD_L4T_RSV |
 291                                 E1000_ADVTXD_DTYP_CTXT | E1000_ADVTXD_DCMD_DEXT;
 292                 break;
 293         }
 294
 295         txq->ctx_cache[ctx_curr].flags           = ol_flags;
 296         txq->ctx_cache[ctx_curr].cmp_mask        = cmp_mask;
 297         txq->ctx_cache[ctx_curr].vlan_macip_lens.data =
 298                 vlan_macip_lens & cmp_mask;
 299
 300         ctx_txd->type_tucmd_mlhl = rte_cpu_to_le_32(type_tucmd_mlhl);
 301         ctx_txd->vlan_macip_lens = rte_cpu_to_le_32(vlan_macip_lens);
 302         ctx_txd->mss_l4len_idx   = rte_cpu_to_le_32(mss_l4len_idx);
 303         ctx_txd->seqnum_seed     = 0;
 304 }
 305
 306 /*
 307  * Check which hardware context can be used. Use the existing match
 308  * or create a new context descriptor.
 309  */
 310 static inline uint32_t
 311 what_advctx_update(struct igb_tx_queue *txq, uint64_t flags,
 312                 uint32_t vlan_macip_lens)
 313 {
 314         /* If match with the current context */
 315         if (likely((txq->ctx_cache[txq->ctx_curr].flags == flags) &&
 316                 (txq->ctx_cache[txq->ctx_curr].vlan_macip_lens.data ==
 317                 (txq->ctx_cache[txq->ctx_curr].cmp_mask & vlan_macip_lens)))) {
 318                         return txq->ctx_curr;
 319         }
 320
 321         /* If match with the second context */
 322         txq->ctx_curr ^= 1;
 323         if (likely((txq->ctx_cache[txq->ctx_curr].flags == flags) &&
 324                 (txq->ctx_cache[txq->ctx_curr].vlan_macip_lens.data ==
 325                 (txq->ctx_cache[txq->ctx_curr].cmp_mask & vlan_macip_lens)))) {
 326                         return txq->ctx_curr;
 327         }
 328
 329         /* Mismatch, use the previous context */
 330         return (IGB_CTX_NUM);
 331 }
 332
 333 static inline uint32_t
 334 tx_desc_cksum_flags_to_olinfo(uint64_t ol_flags)
 335 {
 336         static const uint32_t l4_olinfo[2] = {0, E1000_ADVTXD_POPTS_TXSM};
 337         static const uint32_t l3_olinfo[2] = {0, E1000_ADVTXD_POPTS_IXSM};
 338         uint32_t tmp;
 339
 340         tmp  = l4_olinfo[(ol_flags & PKT_TX_L4_MASK)  != PKT_TX_L4_NO_CKSUM];
 341         tmp |= l3_olinfo[(ol_flags & PKT_TX_IP_CKSUM) != 0];
 342         return tmp;
 343 }
 344
 345 static inline uint32_t
 346 tx_desc_vlan_flags_to_cmdtype(uint64_t ol_flags)
 347 {
 348         static uint32_t vlan_cmd[2] = {0, E1000_ADVTXD_DCMD_VLE};
 349         return vlan_cmd[(ol_flags & PKT_TX_VLAN_PKT) != 0];
 350 }
 351
 352 uint16_t
 353 eth_igb_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 354                uint16_t nb_pkts)
 355 {
 356         struct igb_tx_queue *txq;
 357         struct igb_tx_entry *sw_ring;
 358         struct igb_tx_entry *txe, *txn;
 359         volatile union e1000_adv_tx_desc *txr;
 360         volatile union e1000_adv_tx_desc *txd;
 361         struct rte_mbuf     *tx_pkt;
 362         struct rte_mbuf     *m_seg;
 363         union igb_vlan_macip vlan_macip_lens;
 364         uint64_t buf_dma_addr;
 365         uint32_t olinfo_status;
 366         uint32_t cmd_type_len;
 367         uint32_t pkt_len;
 368         uint16_t slen;
 369         uint64_t ol_flags;
 370         uint16_t tx_end;
 371         uint16_t tx_id;
 372         uint16_t tx_last;
 373         uint16_t nb_tx;
 374         uint64_t tx_ol_req;
 375         uint32_t new_ctx = 0;
 376         uint32_t ctx = 0;
 377
 378         txq = tx_queue;
 379         sw_ring = txq->sw_ring;
 380         txr     = txq->tx_ring;
 381         tx_id   = txq->tx_tail;
 382         txe = &sw_ring[tx_id];
 383
 384         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 385                 tx_pkt = *tx_pkts++;
 386                 pkt_len = tx_pkt->pkt_len;
 387
 388                 RTE_MBUF_PREFETCH_TO_FREE(txe->mbuf);
 389
 390                 /*
 391                  * The number of descriptors that must be allocated for a
 392                  * packet is the number of segments of that packet, plus 1
 393                  * Context Descriptor for the VLAN Tag Identifier, if any.
 394                  * Determine the last TX descriptor to allocate in the TX ring
 395                  * for the packet, starting from the current position (tx_id)
 396                  * in the ring.
 397                  */
 398                 tx_last = (uint16_t) (tx_id + tx_pkt->nb_segs - 1);
 399
 400                 ol_flags = tx_pkt->ol_flags;
 401                 vlan_macip_lens.f.vlan_tci = tx_pkt->vlan_tci;
 402                 vlan_macip_lens.f.l2_l3_len = tx_pkt->l2_l3_len;
 403                 tx_ol_req = ol_flags & PKT_TX_OFFLOAD_MASK;
 404
 405                 /* If a Context Descriptor need be built . */
 406                 if (tx_ol_req) {
 407                         ctx = what_advctx_update(txq, tx_ol_req,
 408                                 vlan_macip_lens.data);
 409                         /* Only allocate context descriptor if required*/
 410                         new_ctx = (ctx == IGB_CTX_NUM);
 411                         ctx = txq->ctx_curr;
 412                         tx_last = (uint16_t) (tx_last + new_ctx);
 413                 }
 414                 if (tx_last >= txq->nb_tx_desc)
 415                         tx_last = (uint16_t) (tx_last - txq->nb_tx_desc);
 416
 417                 PMD_TX_LOG(DEBUG, "port_id=%u queue_id=%u pktlen=%u"
 418                            " tx_first=%u tx_last=%u\n",
 419                            (unsigned) txq->port_id,
 420                            (unsigned) txq->queue_id,
 421                            (unsigned) pkt_len,
 422                            (unsigned) tx_id,
 423                            (unsigned) tx_last);
 424
 425                 /*
 426                  * Check if there are enough free descriptors in the TX ring
 427                  * to transmit the next packet.
 428                  * This operation is based on the two following rules:
 429                  *
 430                  *   1- Only check that the last needed TX descriptor can be
 431                  *      allocated (by construction, if that descriptor is free,
 432                  *      all intermediate ones are also free).
 433                  *
 434                  *      For this purpose, the index of the last TX descriptor
 435                  *      used for a packet (the "last descriptor" of a packet)
 436                  *      is recorded in the TX entries (the last one included)
 437                  *      that are associated with all TX descriptors allocated
 438                  *      for that packet.
 439                  *
 440                  *   2- Avoid to allocate the last free TX descriptor of the
 441                  *      ring, in order to never set the TDT register with the
 442                  *      same value stored in parallel by the NIC in the TDH
 443                  *      register, which makes the TX engine of the NIC enter
 444                  *      in a deadlock situation.
 445                  *
 446                  *      By extension, avoid to allocate a free descriptor that
 447                  *      belongs to the last set of free descriptors allocated
 448                  *      to the same packet previously transmitted.
 449                  */
 450
 451                 /*
 452                  * The "last descriptor" of the previously sent packet, if any,
 453                  * which used the last descriptor to allocate.
 454                  */
 455                 tx_end = sw_ring[tx_last].last_id;
 456
 457                 /*
 458                  * The next descriptor following that "last descriptor" in the
 459                  * ring.
 460                  */
 461                 tx_end = sw_ring[tx_end].next_id;
 462
 463                 /*
 464                  * The "last descriptor" associated with that next descriptor.
 465                  */
 466                 tx_end = sw_ring[tx_end].last_id;
 467
 468                 /*
 469                  * Check that this descriptor is free.
 470                  */
 471                 if (! (txr[tx_end].wb.status & E1000_TXD_STAT_DD)) {
 472                         if (nb_tx == 0)
 473                                 return (0);
 474                         goto end_of_tx;
 475                 }
 476
 477                 /*
 478                  * Set common flags of all TX Data Descriptors.
 479                  *
 480                  * The following bits must be set in all Data Descriptors:
 481                  *   - E1000_ADVTXD_DTYP_DATA
 482                  *   - E1000_ADVTXD_DCMD_DEXT
 483                  *
 484                  * The following bits must be set in the first Data Descriptor
 485                  * and are ignored in the other ones:
 486                  *   - E1000_ADVTXD_DCMD_IFCS
 487                  *   - E1000_ADVTXD_MAC_1588
 488                  *   - E1000_ADVTXD_DCMD_VLE
 489                  *
 490                  * The following bits must only be set in the last Data
 491                  * Descriptor:
 492                  *   - E1000_TXD_CMD_EOP
 493                  *
 494                  * The following bits can be set in any Data Descriptor, but
 495                  * are only set in the last Data Descriptor:
 496                  *   - E1000_TXD_CMD_RS
 497                  */
 498                 cmd_type_len = txq->txd_type |
 499                         E1000_ADVTXD_DCMD_IFCS | E1000_ADVTXD_DCMD_DEXT;
 500                 olinfo_status = (pkt_len << E1000_ADVTXD_PAYLEN_SHIFT);
 501 #if defined(RTE_LIBRTE_IEEE1588)
 502                 if (ol_flags & PKT_TX_IEEE1588_TMST)
 503                         cmd_type_len |= E1000_ADVTXD_MAC_TSTAMP;
 504 #endif
 505                 if (tx_ol_req) {
 506                         /* Setup TX Advanced context descriptor if required */
 507                         if (new_ctx) {
 508                                 volatile struct e1000_adv_tx_context_desc *
 509                                     ctx_txd;
 510
 511                                 ctx_txd = (volatile struct
 512                                     e1000_adv_tx_context_desc *)
 513                                     &txr[tx_id];
 514
 515                                 txn = &sw_ring[txe->next_id];
 516                                 RTE_MBUF_PREFETCH_TO_FREE(txn->mbuf);
 517
 518                                 if (txe->mbuf != NULL) {
 519                                         rte_pktmbuf_free_seg(txe->mbuf);
 520                                         txe->mbuf = NULL;
 521                                 }
 522
 523                                 igbe_set_xmit_ctx(txq, ctx_txd, tx_ol_req,
 524                                     vlan_macip_lens.data);
 525
 526                                 txe->last_id = tx_last;
 527                                 tx_id = txe->next_id;
 528                                 txe = txn;
 529                         }
 530
 531                         /* Setup the TX Advanced Data Descriptor */
 532                         cmd_type_len  |= tx_desc_vlan_flags_to_cmdtype(ol_flags);
 533                         olinfo_status |= tx_desc_cksum_flags_to_olinfo(ol_flags);
 534                         olinfo_status |= (ctx << E1000_ADVTXD_IDX_SHIFT);
 535                 }
 536
 537                 m_seg = tx_pkt;
 538                 do {
 539                         txn = &sw_ring[txe->next_id];
 540                         txd = &txr[tx_id];
 541
 542                         if (txe->mbuf != NULL)
 543                                 rte_pktmbuf_free_seg(txe->mbuf);
 544                         txe->mbuf = m_seg;
 545
 546                         /*
 547                          * Set up transmit descriptor.
 548                          */
 549                         slen = (uint16_t) m_seg->data_len;
 550                         buf_dma_addr = RTE_MBUF_DATA_DMA_ADDR(m_seg);
 551                         txd->read.buffer_addr =
 552                                 rte_cpu_to_le_64(buf_dma_addr);
 553                         txd->read.cmd_type_len =
 554                                 rte_cpu_to_le_32(cmd_type_len | slen);
 555                         txd->read.olinfo_status =
 556                                 rte_cpu_to_le_32(olinfo_status);
 557                         txe->last_id = tx_last;
 558                         tx_id = txe->next_id;
 559                         txe = txn;
 560                         m_seg = m_seg->next;
 561                 } while (m_seg != NULL);
 562
 563                 /*
 564                  * The last packet data descriptor needs End Of Packet (EOP)
 565                  * and Report Status (RS).
 566                  */
 567                 txd->read.cmd_type_len |=
 568                         rte_cpu_to_le_32(E1000_TXD_CMD_EOP | E1000_TXD_CMD_RS);
 569         }
 570  end_of_tx:
 571         rte_wmb();
 572
 573         /*
 574          * Set the Transmit Descriptor Tail (TDT).
 575          */
 576         E1000_PCI_REG_WRITE(txq->tdt_reg_addr, tx_id);
 577         PMD_TX_LOG(DEBUG, "port_id=%u queue_id=%u tx_tail=%u nb_tx=%u",
 578                    (unsigned) txq->port_id, (unsigned) txq->queue_id,
 579                    (unsigned) tx_id, (unsigned) nb_tx);
 580         txq->tx_tail = tx_id;
 581
 582         return (nb_tx);
 583 }
 584
 585 /*********************************************************************
 586  *
 587  *  RX functions
 588  *
 589  **********************************************************************/
 590 static inline uint64_t
 591 rx_desc_hlen_type_rss_to_pkt_flags(uint32_t hl_tp_rs)
 592 {
 593         uint64_t pkt_flags;
 594
 595         static uint64_t ip_pkt_types_map[16] = {
 596                 0, PKT_RX_IPV4_HDR, PKT_RX_IPV4_HDR_EXT, PKT_RX_IPV4_HDR_EXT,
 597                 PKT_RX_IPV6_HDR, 0, 0, 0,
 598                 PKT_RX_IPV6_HDR_EXT, 0, 0, 0,
 599                 PKT_RX_IPV6_HDR_EXT, 0, 0, 0,
 600         };
 601
 602 #if defined(RTE_LIBRTE_IEEE1588)
 603         static uint32_t ip_pkt_etqf_map[8] = {
 604                 0, 0, 0, PKT_RX_IEEE1588_PTP,
 605                 0, 0, 0, 0,
 606         };
 607
 608         pkt_flags = (hl_tp_rs & E1000_RXDADV_PKTTYPE_ETQF) ?
 609                                 ip_pkt_etqf_map[(hl_tp_rs >> 4) & 0x07] :
 610                                 ip_pkt_types_map[(hl_tp_rs >> 4) & 0x0F];
 611 #else
 612         pkt_flags = (hl_tp_rs & E1000_RXDADV_PKTTYPE_ETQF) ? 0 :
 613                                 ip_pkt_types_map[(hl_tp_rs >> 4) & 0x0F];
 614 #endif
 615         return pkt_flags | (((hl_tp_rs & 0x0F) == 0) ?  0 : PKT_RX_RSS_HASH);
 616 }
 617
 618 static inline uint64_t
 619 rx_desc_status_to_pkt_flags(uint32_t rx_status)
 620 {
 621         uint64_t pkt_flags;
 622
 623         /* Check if VLAN present */
 624         pkt_flags = (rx_status & E1000_RXD_STAT_VP) ?  PKT_RX_VLAN_PKT : 0;
 625
 626 #if defined(RTE_LIBRTE_IEEE1588)
 627         if (rx_status & E1000_RXD_STAT_TMST)
 628                 pkt_flags = pkt_flags | PKT_RX_IEEE1588_TMST;
 629 #endif
 630         return pkt_flags;
 631 }
 632
 633 static inline uint64_t
 634 rx_desc_error_to_pkt_flags(uint32_t rx_status)
 635 {
 636         /*
 637          * Bit 30: IPE, IPv4 checksum error
 638          * Bit 29: L4I, L4I integrity error
 639          */
 640
 641         static uint64_t error_to_pkt_flags_map[4] = {
 642                 0,  PKT_RX_L4_CKSUM_BAD, PKT_RX_IP_CKSUM_BAD,
 643                 PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD
 644         };
 645         return error_to_pkt_flags_map[(rx_status >>
 646                 E1000_RXD_ERR_CKSUM_BIT) & E1000_RXD_ERR_CKSUM_MSK];
 647 }
 648
 649 uint16_t
 650 eth_igb_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 651                uint16_t nb_pkts)
 652 {
 653         struct igb_rx_queue *rxq;
 654         volatile union e1000_adv_rx_desc *rx_ring;
 655         volatile union e1000_adv_rx_desc *rxdp;
 656         struct igb_rx_entry *sw_ring;
 657         struct igb_rx_entry *rxe;
 658         struct rte_mbuf *rxm;
 659         struct rte_mbuf *nmb;
 660         union e1000_adv_rx_desc rxd;
 661         uint64_t dma_addr;
 662         uint32_t staterr;
 663         uint32_t hlen_type_rss;
 664         uint16_t pkt_len;
 665         uint16_t rx_id;
 666         uint16_t nb_rx;
 667         uint16_t nb_hold;
 668         uint64_t pkt_flags;
 669
 670         nb_rx = 0;
 671         nb_hold = 0;
 672         rxq = rx_queue;
 673         rx_id = rxq->rx_tail;
 674         rx_ring = rxq->rx_ring;
 675         sw_ring = rxq->sw_ring;
 676         while (nb_rx < nb_pkts) {
 677                 /*
 678                  * The order of operations here is important as the DD status
 679                  * bit must not be read after any other descriptor fields.
 680                  * rx_ring and rxdp are pointing to volatile data so the order
 681                  * of accesses cannot be reordered by the compiler. If they were
 682                  * not volatile, they could be reordered which could lead to
 683                  * using invalid descriptor fields when read from rxd.
 684                  */
 685                 rxdp = &rx_ring[rx_id];
 686                 staterr = rxdp->wb.upper.status_error;
 687                 if (! (staterr & rte_cpu_to_le_32(E1000_RXD_STAT_DD)))
 688                         break;
 689                 rxd = *rxdp;
 690
 691                 /*
 692                  * End of packet.
 693                  *
 694                  * If the E1000_RXD_STAT_EOP flag is not set, the RX packet is
 695                  * likely to be invalid and to be dropped by the various
 696                  * validation checks performed by the network stack.
 697                  *
 698                  * Allocate a new mbuf to replenish the RX ring descriptor.
 699                  * If the allocation fails:
 700                  *    - arrange for that RX descriptor to be the first one
 701                  *      being parsed the next time the receive function is
 702                  *      invoked [on the same queue].
 703                  *
 704                  *    - Stop parsing the RX ring and return immediately.
 705                  *
 706                  * This policy do not drop the packet received in the RX
 707                  * descriptor for which the allocation of a new mbuf failed.
 708                  * Thus, it allows that packet to be later retrieved if
 709                  * mbuf have been freed in the mean time.
 710                  * As a side effect, holding RX descriptors instead of
 711                  * systematically giving them back to the NIC may lead to
 712                  * RX ring exhaustion situations.
 713                  * However, the NIC can gracefully prevent such situations
 714                  * to happen by sending specific "back-pressure" flow control
 715                  * frames to its peer(s).
 716                  */
 717                 PMD_RX_LOG(DEBUG, "\nport_id=%u queue_id=%u rx_id=%u "
 718                            "staterr=0x%x pkt_len=%u\n",
 719                            (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
 720                            (unsigned) rx_id, (unsigned) staterr,
 721                            (unsigned) rte_le_to_cpu_16(rxd.wb.upper.length));
 722
 723                 nmb = rte_rxmbuf_alloc(rxq->mb_pool);
 724                 if (nmb == NULL) {
 725                         PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
 726                                    "queue_id=%u\n", (unsigned) rxq->port_id,
 727                                    (unsigned) rxq->queue_id);
 728                         rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed++;
 729                         break;
 730                 }
 731
 732                 nb_hold++;
 733                 rxe = &sw_ring[rx_id];
 734                 rx_id++;
 735                 if (rx_id == rxq->nb_rx_desc)
 736                         rx_id = 0;
 737
 738                 /* Prefetch next mbuf while processing current one. */
 739                 rte_igb_prefetch(sw_ring[rx_id].mbuf);
 740
 741                 /*
 742                  * When next RX descriptor is on a cache-line boundary,
 743                  * prefetch the next 4 RX descriptors and the next 8 pointers
 744                  * to mbufs.
 745                  */
 746                 if ((rx_id & 0x3) == 0) {
 747                         rte_igb_prefetch(&rx_ring[rx_id]);
 748                         rte_igb_prefetch(&sw_ring[rx_id]);
 749                 }
 750
 751                 rxm = rxe->mbuf;
 752                 rxe->mbuf = nmb;
 753                 dma_addr =
 754                         rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(nmb));
 755                 rxdp->read.hdr_addr = dma_addr;
 756                 rxdp->read.pkt_addr = dma_addr;
 757
 758                 /*
 759                  * Initialize the returned mbuf.
 760                  * 1) setup generic mbuf fields:
 761                  *    - number of segments,
 762                  *    - next segment,
 763                  *    - packet length,
 764                  *    - RX port identifier.
 765                  * 2) integrate hardware offload data, if any:
 766                  *    - RSS flag & hash,
 767                  *    - IP checksum flag,
 768                  *    - VLAN TCI, if any,
 769                  *    - error flags.
 770                  */
 771                 pkt_len = (uint16_t) (rte_le_to_cpu_16(rxd.wb.upper.length) -
 772                                       rxq->crc_len);
 773                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 774                 rte_packet_prefetch((char *)rxm->buf_addr + rxm->data_off);
 775                 rxm->nb_segs = 1;
 776                 rxm->next = NULL;
 777                 rxm->pkt_len = pkt_len;
 778                 rxm->data_len = pkt_len;
 779                 rxm->port = rxq->port_id;
 780
 781                 rxm->hash.rss = rxd.wb.lower.hi_dword.rss;
 782                 hlen_type_rss = rte_le_to_cpu_32(rxd.wb.lower.lo_dword.data);
 783                 /* Only valid if PKT_RX_VLAN_PKT set in pkt_flags */
 784                 rxm->vlan_tci = rte_le_to_cpu_16(rxd.wb.upper.vlan);
 785
 786                 pkt_flags = rx_desc_hlen_type_rss_to_pkt_flags(hlen_type_rss);
 787                 pkt_flags = pkt_flags | rx_desc_status_to_pkt_flags(staterr);
 788                 pkt_flags = pkt_flags | rx_desc_error_to_pkt_flags(staterr);
 789                 rxm->ol_flags = pkt_flags;
 790
 791                 /*
 792                  * Store the mbuf address into the next entry of the array
 793                  * of returned packets.
 794                  */
 795                 rx_pkts[nb_rx++] = rxm;
 796         }
 797         rxq->rx_tail = rx_id;
 798
 799         /*
 800          * If the number of free RX descriptors is greater than the RX free
 801          * threshold of the queue, advance the Receive Descriptor Tail (RDT)
 802          * register.
 803          * Update the RDT with the value of the last processed RX descriptor
 804          * minus 1, to guarantee that the RDT register is never equal to the
 805          * RDH register, which creates a "full" ring situtation from the
 806          * hardware point of view...
 807          */
 808         nb_hold = (uint16_t) (nb_hold + rxq->nb_rx_hold);
 809         if (nb_hold > rxq->rx_free_thresh) {
 810                 PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
 811                            "nb_hold=%u nb_rx=%u\n",
 812                            (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
 813                            (unsigned) rx_id, (unsigned) nb_hold,
 814                            (unsigned) nb_rx);
 815                 rx_id = (uint16_t) ((rx_id == 0) ?
 816                                      (rxq->nb_rx_desc - 1) : (rx_id - 1));
 817                 E1000_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
 818                 nb_hold = 0;
 819         }
 820         rxq->nb_rx_hold = nb_hold;
 821         return (nb_rx);
 822 }
 823
 824 uint16_t
 825 eth_igb_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 826                          uint16_t nb_pkts)
 827 {
 828         struct igb_rx_queue *rxq;
 829         volatile union e1000_adv_rx_desc *rx_ring;
 830         volatile union e1000_adv_rx_desc *rxdp;
 831         struct igb_rx_entry *sw_ring;
 832         struct igb_rx_entry *rxe;
 833         struct rte_mbuf *first_seg;
 834         struct rte_mbuf *last_seg;
 835         struct rte_mbuf *rxm;
 836         struct rte_mbuf *nmb;
 837         union e1000_adv_rx_desc rxd;
 838         uint64_t dma; /* Physical address of mbuf data buffer */
 839         uint32_t staterr;
 840         uint32_t hlen_type_rss;
 841         uint16_t rx_id;
 842         uint16_t nb_rx;
 843         uint16_t nb_hold;
 844         uint16_t data_len;
 845         uint64_t pkt_flags;
 846
 847         nb_rx = 0;
 848         nb_hold = 0;
 849         rxq = rx_queue;
 850         rx_id = rxq->rx_tail;
 851         rx_ring = rxq->rx_ring;
 852         sw_ring = rxq->sw_ring;
 853
 854         /*
 855          * Retrieve RX context of current packet, if any.
 856          */
 857         first_seg = rxq->pkt_first_seg;
 858         last_seg = rxq->pkt_last_seg;
 859
 860         while (nb_rx < nb_pkts) {
 861         next_desc:
 862                 /*
 863                  * The order of operations here is important as the DD status
 864                  * bit must not be read after any other descriptor fields.
 865                  * rx_ring and rxdp are pointing to volatile data so the order
 866                  * of accesses cannot be reordered by the compiler. If they were
 867                  * not volatile, they could be reordered which could lead to
 868                  * using invalid descriptor fields when read from rxd.
 869                  */
 870                 rxdp = &rx_ring[rx_id];
 871                 staterr = rxdp->wb.upper.status_error;
 872                 if (! (staterr & rte_cpu_to_le_32(E1000_RXD_STAT_DD)))
 873                         break;
 874                 rxd = *rxdp;
 875
 876                 /*
 877                  * Descriptor done.
 878                  *
 879                  * Allocate a new mbuf to replenish the RX ring descriptor.
 880                  * If the allocation fails:
 881                  *    - arrange for that RX descriptor to be the first one
 882                  *      being parsed the next time the receive function is
 883                  *      invoked [on the same queue].
 884                  *
 885                  *    - Stop parsing the RX ring and return immediately.
 886                  *
 887                  * This policy does not drop the packet received in the RX
 888                  * descriptor for which the allocation of a new mbuf failed.
 889                  * Thus, it allows that packet to be later retrieved if
 890                  * mbuf have been freed in the mean time.
 891                  * As a side effect, holding RX descriptors instead of
 892                  * systematically giving them back to the NIC may lead to
 893                  * RX ring exhaustion situations.
 894                  * However, the NIC can gracefully prevent such situations
 895                  * to happen by sending specific "back-pressure" flow control
 896                  * frames to its peer(s).
 897                  */
 898                 PMD_RX_LOG(DEBUG, "\nport_id=%u queue_id=%u rx_id=%u "
 899                            "staterr=0x%x data_len=%u\n",
 900                            (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
 901                            (unsigned) rx_id, (unsigned) staterr,
 902                            (unsigned) rte_le_to_cpu_16(rxd.wb.upper.length));
 903
 904                 nmb = rte_rxmbuf_alloc(rxq->mb_pool);
 905                 if (nmb == NULL) {
 906                         PMD_RX_LOG(DEBUG, "RX mbuf alloc failed port_id=%u "
 907                                    "queue_id=%u\n", (unsigned) rxq->port_id,
 908                                    (unsigned) rxq->queue_id);
 909                         rte_eth_devices[rxq->port_id].data->rx_mbuf_alloc_failed++;
 910                         break;
 911                 }
 912
 913                 nb_hold++;
 914                 rxe = &sw_ring[rx_id];
 915                 rx_id++;
 916                 if (rx_id == rxq->nb_rx_desc)
 917                         rx_id = 0;
 918
 919                 /* Prefetch next mbuf while processing current one. */
 920                 rte_igb_prefetch(sw_ring[rx_id].mbuf);
 921
 922                 /*
 923                  * When next RX descriptor is on a cache-line boundary,
 924                  * prefetch the next 4 RX descriptors and the next 8 pointers
 925                  * to mbufs.
 926                  */
 927                 if ((rx_id & 0x3) == 0) {
 928                         rte_igb_prefetch(&rx_ring[rx_id]);
 929                         rte_igb_prefetch(&sw_ring[rx_id]);
 930                 }
 931
 932                 /*
 933                  * Update RX descriptor with the physical address of the new
 934                  * data buffer of the new allocated mbuf.
 935                  */
 936                 rxm = rxe->mbuf;
 937                 rxe->mbuf = nmb;
 938                 dma = rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(nmb));
 939                 rxdp->read.pkt_addr = dma;
 940                 rxdp->read.hdr_addr = dma;
 941
 942                 /*
 943                  * Set data length & data buffer address of mbuf.
 944                  */
 945                 data_len = rte_le_to_cpu_16(rxd.wb.upper.length);
 946                 rxm->data_len = data_len;
 947                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 948
 949                 /*
 950                  * If this is the first buffer of the received packet,
 951                  * set the pointer to the first mbuf of the packet and
 952                  * initialize its context.
 953                  * Otherwise, update the total length and the number of segments
 954                  * of the current scattered packet, and update the pointer to
 955                  * the last mbuf of the current packet.
 956                  */
 957                 if (first_seg == NULL) {
 958                         first_seg = rxm;
 959                         first_seg->pkt_len = data_len;
 960                         first_seg->nb_segs = 1;
 961                 } else {
 962                         first_seg->pkt_len += data_len;
 963                         first_seg->nb_segs++;
 964                         last_seg->next = rxm;
 965                 }
 966
 967                 /*
 968                  * If this is not the last buffer of the received packet,
 969                  * update the pointer to the last mbuf of the current scattered
 970                  * packet and continue to parse the RX ring.
 971                  */
 972                 if (! (staterr & E1000_RXD_STAT_EOP)) {
 973                         last_seg = rxm;
 974                         goto next_desc;
 975                 }
 976
 977                 /*
 978                  * This is the last buffer of the received packet.
 979                  * If the CRC is not stripped by the hardware:
 980                  *   - Subtract the CRC length from the total packet length.
 981                  *   - If the last buffer only contains the whole CRC or a part
 982                  *     of it, free the mbuf associated to the last buffer.
 983                  *     If part of the CRC is also contained in the previous
 984                  *     mbuf, subtract the length of that CRC part from the
 985                  *     data length of the previous mbuf.
 986                  */
 987                 rxm->next = NULL;
 988                 if (unlikely(rxq->crc_len > 0)) {
 989                         first_seg->pkt_len -= ETHER_CRC_LEN;
 990                         if (data_len <= ETHER_CRC_LEN) {
 991                                 rte_pktmbuf_free_seg(rxm);
 992                                 first_seg->nb_segs--;
 993                                 last_seg->data_len = (uint16_t)
 994                                         (last_seg->data_len -
 995                                          (ETHER_CRC_LEN - data_len));
 996                                 last_seg->next = NULL;
 997                         } else
 998                                 rxm->data_len =
 999                                         (uint16_t) (data_len - ETHER_CRC_LEN);
1000                 }
1001
1002                 /*
1003                  * Initialize the first mbuf of the returned packet:
1004                  *    - RX port identifier,
1005                  *    - hardware offload data, if any:
1006                  *      - RSS flag & hash,
1007                  *      - IP checksum flag,
1008                  *      - VLAN TCI, if any,
1009                  *      - error flags.
1010                  */
1011                 first_seg->port = rxq->port_id;
1012                 first_seg->hash.rss = rxd.wb.lower.hi_dword.rss;
1013
1014                 /*
1015                  * The vlan_tci field is only valid when PKT_RX_VLAN_PKT is
1016                  * set in the pkt_flags field.
1017                  */
1018                 first_seg->vlan_tci = rte_le_to_cpu_16(rxd.wb.upper.vlan);
1019                 hlen_type_rss = rte_le_to_cpu_32(rxd.wb.lower.lo_dword.data);
1020                 pkt_flags = rx_desc_hlen_type_rss_to_pkt_flags(hlen_type_rss);
1021                 pkt_flags = pkt_flags | rx_desc_status_to_pkt_flags(staterr);
1022                 pkt_flags = pkt_flags | rx_desc_error_to_pkt_flags(staterr);
1023                 first_seg->ol_flags = pkt_flags;
1024
1025                 /* Prefetch data of first segment, if configured to do so. */
1026                 rte_packet_prefetch((char *)first_seg->buf_addr +
1027                         first_seg->data_off);
1028
1029                 /*
1030                  * Store the mbuf address into the next entry of the array
1031                  * of returned packets.
1032                  */
1033                 rx_pkts[nb_rx++] = first_seg;
1034
1035                 /*
1036                  * Setup receipt context for a new packet.
1037                  */
1038                 first_seg = NULL;
1039         }
1040
1041         /*
1042          * Record index of the next RX descriptor to probe.
1043          */
1044         rxq->rx_tail = rx_id;
1045
1046         /*
1047          * Save receive context.
1048          */
1049         rxq->pkt_first_seg = first_seg;
1050         rxq->pkt_last_seg = last_seg;
1051
1052         /*
1053          * If the number of free RX descriptors is greater than the RX free
1054          * threshold of the queue, advance the Receive Descriptor Tail (RDT)
1055          * register.
1056          * Update the RDT with the value of the last processed RX descriptor
1057          * minus 1, to guarantee that the RDT register is never equal to the
1058          * RDH register, which creates a "full" ring situtation from the
1059          * hardware point of view...
1060          */
1061         nb_hold = (uint16_t) (nb_hold + rxq->nb_rx_hold);
1062         if (nb_hold > rxq->rx_free_thresh) {
1063                 PMD_RX_LOG(DEBUG, "port_id=%u queue_id=%u rx_tail=%u "
1064                            "nb_hold=%u nb_rx=%u\n",
1065                            (unsigned) rxq->port_id, (unsigned) rxq->queue_id,
1066                            (unsigned) rx_id, (unsigned) nb_hold,
1067                            (unsigned) nb_rx);
1068                 rx_id = (uint16_t) ((rx_id == 0) ?
1069                                      (rxq->nb_rx_desc - 1) : (rx_id - 1));
1070                 E1000_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
1071                 nb_hold = 0;
1072         }
1073         rxq->nb_rx_hold = nb_hold;
1074         return (nb_rx);
1075 }
1076
1077 /*
1078  * Rings setup and release.
1079  *
1080  * TDBA/RDBA should be aligned on 16 byte boundary. But TDLEN/RDLEN should be
1081  * multiple of 128 bytes. So we align TDBA/RDBA on 128 byte boundary.
1082  * This will also optimize cache line size effect.
1083  * H/W supports up to cache line size 128.
1084  */
1085 #define IGB_ALIGN 128
1086
1087 /*
1088  * Maximum number of Ring Descriptors.
1089  *
1090  * Since RDLEN/TDLEN should be multiple of 128bytes, the number of ring
1091  * desscriptors should meet the following condition:
1092  *      (num_ring_desc * sizeof(struct e1000_rx/tx_desc)) % 128 == 0
1093  */
1094 #define IGB_MIN_RING_DESC 32
1095 #define IGB_MAX_RING_DESC 4096
1096
1097 static const struct rte_memzone *
1098 ring_dma_zone_reserve(struct rte_eth_dev *dev, const char *ring_name,
1099                       uint16_t queue_id, uint32_t ring_size, int socket_id)
1100 {
1101         char z_name[RTE_MEMZONE_NAMESIZE];
1102         const struct rte_memzone *mz;
1103
1104         snprintf(z_name, sizeof(z_name), "%s_%s_%d_%d",
1105                         dev->driver->pci_drv.name, ring_name,
1106                                 dev->data->port_id, queue_id);
1107         mz = rte_memzone_lookup(z_name);
1108         if (mz)
1109                 return mz;
1110
1111 #ifdef RTE_LIBRTE_XEN_DOM0
1112         return rte_memzone_reserve_bounded(z_name, ring_size,
1113                         socket_id, 0, IGB_ALIGN, RTE_PGSIZE_2M);
1114 #else
1115         return rte_memzone_reserve_aligned(z_name, ring_size,
1116                         socket_id, 0, IGB_ALIGN);
1117 #endif
1118 }
1119
1120 static void
1121 igb_tx_queue_release_mbufs(struct igb_tx_queue *txq)
1122 {
1123         unsigned i;
1124
1125         if (txq->sw_ring != NULL) {
1126                 for (i = 0; i < txq->nb_tx_desc; i++) {
1127                         if (txq->sw_ring[i].mbuf != NULL) {
1128                                 rte_pktmbuf_free_seg(txq->sw_ring[i].mbuf);
1129                                 txq->sw_ring[i].mbuf = NULL;
1130                         }
1131                 }
1132         }
1133 }
1134
1135 static void
1136 igb_tx_queue_release(struct igb_tx_queue *txq)
1137 {
1138         if (txq != NULL) {
1139                 igb_tx_queue_release_mbufs(txq);
1140                 rte_free(txq->sw_ring);
1141                 rte_free(txq);
1142         }
1143 }
1144
1145 void
1146 eth_igb_tx_queue_release(void *txq)
1147 {
1148         igb_tx_queue_release(txq);
1149 }
1150
1151 static void
1152 igb_reset_tx_queue_stat(struct igb_tx_queue *txq)
1153 {
1154         txq->tx_head = 0;
1155         txq->tx_tail = 0;
1156         txq->ctx_curr = 0;
1157         memset((void*)&txq->ctx_cache, 0,
1158                 IGB_CTX_NUM * sizeof(struct igb_advctx_info));
1159 }
1160
1161 static void
1162 igb_reset_tx_queue(struct igb_tx_queue *txq, struct rte_eth_dev *dev)
1163 {
1164         static const union e1000_adv_tx_desc zeroed_desc = { .read = {
1165                         .buffer_addr = 0}};
1166         struct igb_tx_entry *txe = txq->sw_ring;
1167         uint16_t i, prev;
1168         struct e1000_hw *hw;
1169
1170         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1171         /* Zero out HW ring memory */
1172         for (i = 0; i < txq->nb_tx_desc; i++) {
1173                 txq->tx_ring[i] = zeroed_desc;
1174         }
1175
1176         /* Initialize ring entries */
1177         prev = (uint16_t)(txq->nb_tx_desc - 1);
1178         for (i = 0; i < txq->nb_tx_desc; i++) {
1179                 volatile union e1000_adv_tx_desc *txd = &(txq->tx_ring[i]);
1180
1181                 txd->wb.status = E1000_TXD_STAT_DD;
1182                 txe[i].mbuf = NULL;
1183                 txe[i].last_id = i;
1184                 txe[prev].next_id = i;
1185                 prev = i;
1186         }
1187
1188         txq->txd_type = E1000_ADVTXD_DTYP_DATA;
1189         /* 82575 specific, each tx queue will use 2 hw contexts */
1190         if (hw->mac.type == e1000_82575)
1191                 txq->ctx_start = txq->queue_id * IGB_CTX_NUM;
1192
1193         igb_reset_tx_queue_stat(txq);
1194 }
1195
1196 int
1197 eth_igb_tx_queue_setup(struct rte_eth_dev *dev,
1198                          uint16_t queue_idx,
1199                          uint16_t nb_desc,
1200                          unsigned int socket_id,
1201                          const struct rte_eth_txconf *tx_conf)
1202 {
1203         const struct rte_memzone *tz;
1204         struct igb_tx_queue *txq;
1205         struct e1000_hw     *hw;
1206         uint32_t size;
1207
1208         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1209
1210         /*
1211          * Validate number of transmit descriptors.
1212          * It must not exceed hardware maximum, and must be multiple
1213          * of IGB_ALIGN.
1214          */
1215         if (((nb_desc * sizeof(union e1000_adv_tx_desc)) % IGB_ALIGN) != 0 ||
1216             (nb_desc > IGB_MAX_RING_DESC) || (nb_desc < IGB_MIN_RING_DESC)) {
1217                 return -EINVAL;
1218         }
1219
1220         /*
1221          * The tx_free_thresh and tx_rs_thresh values are not used in the 1G
1222          * driver.
1223          */
1224         if (tx_conf->tx_free_thresh != 0)
1225                 PMD_INIT_LOG(WARNING, "The tx_free_thresh parameter is not "
1226                              "used for the 1G driver.");
1227         if (tx_conf->tx_rs_thresh != 0)
1228                 PMD_INIT_LOG(WARNING, "The tx_rs_thresh parameter is not "
1229                              "used for the 1G driver.");
1230         if (tx_conf->tx_thresh.wthresh == 0)
1231                 PMD_INIT_LOG(WARNING, "To improve 1G driver performance, "
1232                              "consider setting the TX WTHRESH value to 4, 8, "
1233                              "or 16.");
1234
1235         /* Free memory prior to re-allocation if needed */
1236         if (dev->data->tx_queues[queue_idx] != NULL) {
1237                 igb_tx_queue_release(dev->data->tx_queues[queue_idx]);
1238                 dev->data->tx_queues[queue_idx] = NULL;
1239         }
1240
1241         /* First allocate the tx queue data structure */
1242         txq = rte_zmalloc("ethdev TX queue", sizeof(struct igb_tx_queue),
1243                                                         CACHE_LINE_SIZE);
1244         if (txq == NULL)
1245                 return (-ENOMEM);
1246
1247         /*
1248          * Allocate TX ring hardware descriptors. A memzone large enough to
1249          * handle the maximum ring size is allocated in order to allow for
1250          * resizing in later calls to the queue setup function.
1251          */
1252         size = sizeof(union e1000_adv_tx_desc) * IGB_MAX_RING_DESC;
1253         tz = ring_dma_zone_reserve(dev, "tx_ring", queue_idx,
1254                                         size, socket_id);
1255         if (tz == NULL) {
1256                 igb_tx_queue_release(txq);
1257                 return (-ENOMEM);
1258         }
1259
1260         txq->nb_tx_desc = nb_desc;
1261         txq->pthresh = tx_conf->tx_thresh.pthresh;
1262         txq->hthresh = tx_conf->tx_thresh.hthresh;
1263         txq->wthresh = tx_conf->tx_thresh.wthresh;
1264         if (txq->wthresh > 0 && hw->mac.type == e1000_82576)
1265                 txq->wthresh = 1;
1266         txq->queue_id = queue_idx;
1267         txq->reg_idx = (uint16_t)((RTE_ETH_DEV_SRIOV(dev).active == 0) ?
1268                 queue_idx : RTE_ETH_DEV_SRIOV(dev).def_pool_q_idx + queue_idx);
1269         txq->port_id = dev->data->port_id;
1270
1271         txq->tdt_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_TDT(txq->reg_idx));
1272 #ifndef RTE_LIBRTE_XEN_DOM0
1273         txq->tx_ring_phys_addr = (uint64_t) tz->phys_addr;
1274 #else
1275         txq->tx_ring_phys_addr = rte_mem_phy2mch(tz->memseg_id, tz->phys_addr);
1276 #endif
1277          txq->tx_ring = (union e1000_adv_tx_desc *) tz->addr;
1278         /* Allocate software ring */
1279         txq->sw_ring = rte_zmalloc("txq->sw_ring",
1280                                    sizeof(struct igb_tx_entry) * nb_desc,
1281                                    CACHE_LINE_SIZE);
1282         if (txq->sw_ring == NULL) {
1283                 igb_tx_queue_release(txq);
1284                 return (-ENOMEM);
1285         }
1286         PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64"\n",
1287                      txq->sw_ring, txq->tx_ring, txq->tx_ring_phys_addr);
1288
1289         igb_reset_tx_queue(txq, dev);
1290         dev->tx_pkt_burst = eth_igb_xmit_pkts;
1291         dev->data->tx_queues[queue_idx] = txq;
1292
1293         return (0);
1294 }
1295
1296 static void
1297 igb_rx_queue_release_mbufs(struct igb_rx_queue *rxq)
1298 {
1299         unsigned i;
1300
1301         if (rxq->sw_ring != NULL) {
1302                 for (i = 0; i < rxq->nb_rx_desc; i++) {
1303                         if (rxq->sw_ring[i].mbuf != NULL) {
1304                                 rte_pktmbuf_free_seg(rxq->sw_ring[i].mbuf);
1305                                 rxq->sw_ring[i].mbuf = NULL;
1306                         }
1307                 }
1308         }
1309 }
1310
1311 static void
1312 igb_rx_queue_release(struct igb_rx_queue *rxq)
1313 {
1314         if (rxq != NULL) {
1315                 igb_rx_queue_release_mbufs(rxq);
1316                 rte_free(rxq->sw_ring);
1317                 rte_free(rxq);
1318         }
1319 }
1320
1321 void
1322 eth_igb_rx_queue_release(void *rxq)
1323 {
1324         igb_rx_queue_release(rxq);
1325 }
1326
1327 static void
1328 igb_reset_rx_queue(struct igb_rx_queue *rxq)
1329 {
1330         static const union e1000_adv_rx_desc zeroed_desc = { .read = {
1331                         .pkt_addr = 0}};
1332         unsigned i;
1333
1334         /* Zero out HW ring memory */
1335         for (i = 0; i < rxq->nb_rx_desc; i++) {
1336                 rxq->rx_ring[i] = zeroed_desc;
1337         }
1338
1339         rxq->rx_tail = 0;
1340         rxq->pkt_first_seg = NULL;
1341         rxq->pkt_last_seg = NULL;
1342 }
1343
1344 int
1345 eth_igb_rx_queue_setup(struct rte_eth_dev *dev,
1346                          uint16_t queue_idx,
1347                          uint16_t nb_desc,
1348                          unsigned int socket_id,
1349                          const struct rte_eth_rxconf *rx_conf,
1350                          struct rte_mempool *mp)
1351 {
1352         const struct rte_memzone *rz;
1353         struct igb_rx_queue *rxq;
1354         struct e1000_hw     *hw;
1355         unsigned int size;
1356
1357         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1358
1359         /*
1360          * Validate number of receive descriptors.
1361          * It must not exceed hardware maximum, and must be multiple
1362          * of IGB_ALIGN.
1363          */
1364         if (((nb_desc * sizeof(union e1000_adv_rx_desc)) % IGB_ALIGN) != 0 ||
1365             (nb_desc > IGB_MAX_RING_DESC) || (nb_desc < IGB_MIN_RING_DESC)) {
1366                 return (-EINVAL);
1367         }
1368
1369         /* Free memory prior to re-allocation if needed */
1370         if (dev->data->rx_queues[queue_idx] != NULL) {
1371                 igb_rx_queue_release(dev->data->rx_queues[queue_idx]);
1372                 dev->data->rx_queues[queue_idx] = NULL;
1373         }
1374
1375         /* First allocate the RX queue data structure. */
1376         rxq = rte_zmalloc("ethdev RX queue", sizeof(struct igb_rx_queue),
1377                           CACHE_LINE_SIZE);
1378         if (rxq == NULL)
1379                 return (-ENOMEM);
1380         rxq->mb_pool = mp;
1381         rxq->nb_rx_desc = nb_desc;
1382         rxq->pthresh = rx_conf->rx_thresh.pthresh;
1383         rxq->hthresh = rx_conf->rx_thresh.hthresh;
1384         rxq->wthresh = rx_conf->rx_thresh.wthresh;
1385         if (rxq->wthresh > 0 && hw->mac.type == e1000_82576)
1386                 rxq->wthresh = 1;
1387         rxq->drop_en = rx_conf->rx_drop_en;
1388         rxq->rx_free_thresh = rx_conf->rx_free_thresh;
1389         rxq->queue_id = queue_idx;
1390         rxq->reg_idx = (uint16_t)((RTE_ETH_DEV_SRIOV(dev).active == 0) ?
1391                 queue_idx : RTE_ETH_DEV_SRIOV(dev).def_pool_q_idx + queue_idx);
1392         rxq->port_id = dev->data->port_id;
1393         rxq->crc_len = (uint8_t) ((dev->data->dev_conf.rxmode.hw_strip_crc) ? 0 :
1394                                   ETHER_CRC_LEN);
1395
1396         /*
1397          *  Allocate RX ring hardware descriptors. A memzone large enough to
1398          *  handle the maximum ring size is allocated in order to allow for
1399          *  resizing in later calls to the queue setup function.
1400          */
1401         size = sizeof(union e1000_adv_rx_desc) * IGB_MAX_RING_DESC;
1402         rz = ring_dma_zone_reserve(dev, "rx_ring", queue_idx, size, socket_id);
1403         if (rz == NULL) {
1404                 igb_rx_queue_release(rxq);
1405                 return (-ENOMEM);
1406         }
1407         rxq->rdt_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_RDT(rxq->reg_idx));
1408         rxq->rdh_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_RDH(rxq->reg_idx));
1409 #ifndef RTE_LIBRTE_XEN_DOM0
1410         rxq->rx_ring_phys_addr = (uint64_t) rz->phys_addr;
1411 #else
1412         rxq->rx_ring_phys_addr = rte_mem_phy2mch(rz->memseg_id, rz->phys_addr);
1413 #endif
1414         rxq->rx_ring = (union e1000_adv_rx_desc *) rz->addr;
1415
1416         /* Allocate software ring. */
1417         rxq->sw_ring = rte_zmalloc("rxq->sw_ring",
1418                                    sizeof(struct igb_rx_entry) * nb_desc,
1419                                    CACHE_LINE_SIZE);
1420         if (rxq->sw_ring == NULL) {
1421                 igb_rx_queue_release(rxq);
1422                 return (-ENOMEM);
1423         }
1424         PMD_INIT_LOG(DEBUG, "sw_ring=%p hw_ring=%p dma_addr=0x%"PRIx64"\n",
1425                      rxq->sw_ring, rxq->rx_ring, rxq->rx_ring_phys_addr);
1426
1427         dev->data->rx_queues[queue_idx] = rxq;
1428         igb_reset_rx_queue(rxq);
1429
1430         return 0;
1431 }
1432
1433 uint32_t
1434 eth_igb_rx_queue_count(struct rte_eth_dev *dev, uint16_t rx_queue_id)
1435 {
1436 #define IGB_RXQ_SCAN_INTERVAL 4
1437         volatile union e1000_adv_rx_desc *rxdp;
1438         struct igb_rx_queue *rxq;
1439         uint32_t desc = 0;
1440
1441         if (rx_queue_id >= dev->data->nb_rx_queues) {
1442                 PMD_RX_LOG(ERR, "Invalid RX queue id=%d\n", rx_queue_id);
1443                 return 0;
1444         }
1445
1446         rxq = dev->data->rx_queues[rx_queue_id];
1447         rxdp = &(rxq->rx_ring[rxq->rx_tail]);
1448
1449         while ((desc < rxq->nb_rx_desc) &&
1450                 (rxdp->wb.upper.status_error & E1000_RXD_STAT_DD)) {
1451                 desc += IGB_RXQ_SCAN_INTERVAL;
1452                 rxdp += IGB_RXQ_SCAN_INTERVAL;
1453                 if (rxq->rx_tail + desc >= rxq->nb_rx_desc)
1454                         rxdp = &(rxq->rx_ring[rxq->rx_tail +
1455                                 desc - rxq->nb_rx_desc]);
1456         }
1457
1458         return 0;
1459 }
1460
1461 int
1462 eth_igb_rx_descriptor_done(void *rx_queue, uint16_t offset)
1463 {
1464         volatile union e1000_adv_rx_desc *rxdp;
1465         struct igb_rx_queue *rxq = rx_queue;
1466         uint32_t desc;
1467
1468         if (unlikely(offset >= rxq->nb_rx_desc))
1469                 return 0;
1470         desc = rxq->rx_tail + offset;
1471         if (desc >= rxq->nb_rx_desc)
1472                 desc -= rxq->nb_rx_desc;
1473
1474         rxdp = &rxq->rx_ring[desc];
1475         return !!(rxdp->wb.upper.status_error & E1000_RXD_STAT_DD);
1476 }
1477
1478 void
1479 igb_dev_clear_queues(struct rte_eth_dev *dev)
1480 {
1481         uint16_t i;
1482         struct igb_tx_queue *txq;
1483         struct igb_rx_queue *rxq;
1484
1485         for (i = 0; i < dev->data->nb_tx_queues; i++) {
1486                 txq = dev->data->tx_queues[i];
1487                 if (txq != NULL) {
1488                         igb_tx_queue_release_mbufs(txq);
1489                         igb_reset_tx_queue(txq, dev);
1490                 }
1491         }
1492
1493         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1494                 rxq = dev->data->rx_queues[i];
1495                 if (rxq != NULL) {
1496                         igb_rx_queue_release_mbufs(rxq);
1497                         igb_reset_rx_queue(rxq);
1498                 }
1499         }
1500 }
1501
1502 /**
1503  * Receive Side Scaling (RSS).
1504  * See section 7.1.1.7 in the following document:
1505  *     "Intel 82576 GbE Controller Datasheet" - Revision 2.45 October 2009
1506  *
1507  * Principles:
1508  * The source and destination IP addresses of the IP header and the source and
1509  * destination ports of TCP/UDP headers, if any, of received packets are hashed
1510  * against a configurable random key to compute a 32-bit RSS hash result.
1511  * The seven (7) LSBs of the 32-bit hash result are used as an index into a
1512  * 128-entry redirection table (RETA).  Each entry of the RETA provides a 3-bit
1513  * RSS output index which is used as the RX queue index where to store the
1514  * received packets.
1515  * The following output is supplied in the RX write-back descriptor:
1516  *     - 32-bit result of the Microsoft RSS hash function,
1517  *     - 4-bit RSS type field.
1518  */
1519
1520 /*
1521  * RSS random key supplied in section 7.1.1.7.3 of the Intel 82576 datasheet.
1522  * Used as the default key.
1523  */
1524 static uint8_t rss_intel_key[40] = {
1525         0x6D, 0x5A, 0x56, 0xDA, 0x25, 0x5B, 0x0E, 0xC2,
1526         0x41, 0x67, 0x25, 0x3D, 0x43, 0xA3, 0x8F, 0xB0,
1527         0xD0, 0xCA, 0x2B, 0xCB, 0xAE, 0x7B, 0x30, 0xB4,
1528         0x77, 0xCB, 0x2D, 0xA3, 0x80, 0x30, 0xF2, 0x0C,
1529         0x6A, 0x42, 0xB7, 0x3B, 0xBE, 0xAC, 0x01, 0xFA,
1530 };
1531
1532 static void
1533 igb_rss_disable(struct rte_eth_dev *dev)
1534 {
1535         struct e1000_hw *hw;
1536         uint32_t mrqc;
1537
1538         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1539         mrqc = E1000_READ_REG(hw, E1000_MRQC);
1540         mrqc &= ~E1000_MRQC_ENABLE_MASK;
1541         E1000_WRITE_REG(hw, E1000_MRQC, mrqc);
1542 }
1543
1544 static void
1545 igb_hw_rss_hash_set(struct e1000_hw *hw, struct rte_eth_rss_conf *rss_conf)
1546 {
1547         uint8_t  *hash_key;
1548         uint32_t rss_key;
1549         uint32_t mrqc;
1550         uint64_t rss_hf;
1551         uint16_t i;
1552
1553         hash_key = rss_conf->rss_key;
1554         if (hash_key != NULL) {
1555                 /* Fill in RSS hash key */
1556                 for (i = 0; i < 10; i++) {
1557                         rss_key  = hash_key[(i * 4)];
1558                         rss_key |= hash_key[(i * 4) + 1] << 8;
1559                         rss_key |= hash_key[(i * 4) + 2] << 16;
1560                         rss_key |= hash_key[(i * 4) + 3] << 24;
1561                         E1000_WRITE_REG_ARRAY(hw, E1000_RSSRK(0), i, rss_key);
1562                 }
1563         }
1564
1565         /* Set configured hashing protocols in MRQC register */
1566         rss_hf = rss_conf->rss_hf;
1567         mrqc = E1000_MRQC_ENABLE_RSS_4Q; /* RSS enabled. */
1568         if (rss_hf & ETH_RSS_IPV4)
1569                 mrqc |= E1000_MRQC_RSS_FIELD_IPV4;
1570         if (rss_hf & ETH_RSS_IPV4_TCP)
1571                 mrqc |= E1000_MRQC_RSS_FIELD_IPV4_TCP;
1572         if (rss_hf & ETH_RSS_IPV6)
1573                 mrqc |= E1000_MRQC_RSS_FIELD_IPV6;
1574         if (rss_hf & ETH_RSS_IPV6_EX)
1575                 mrqc |= E1000_MRQC_RSS_FIELD_IPV6_EX;
1576         if (rss_hf & ETH_RSS_IPV6_TCP)
1577                 mrqc |= E1000_MRQC_RSS_FIELD_IPV6_TCP;
1578         if (rss_hf & ETH_RSS_IPV6_TCP_EX)
1579                 mrqc |= E1000_MRQC_RSS_FIELD_IPV6_TCP_EX;
1580         if (rss_hf & ETH_RSS_IPV4_UDP)
1581                 mrqc |= E1000_MRQC_RSS_FIELD_IPV4_UDP;
1582         if (rss_hf & ETH_RSS_IPV6_UDP)
1583                 mrqc |= E1000_MRQC_RSS_FIELD_IPV6_UDP;
1584         if (rss_hf & ETH_RSS_IPV6_UDP_EX)
1585                 mrqc |= E1000_MRQC_RSS_FIELD_IPV6_UDP_EX;
1586         E1000_WRITE_REG(hw, E1000_MRQC, mrqc);
1587 }
1588
1589 int
1590 eth_igb_rss_hash_update(struct rte_eth_dev *dev,
1591                         struct rte_eth_rss_conf *rss_conf)
1592 {
1593         struct e1000_hw *hw;
1594         uint32_t mrqc;
1595         uint64_t rss_hf;
1596
1597         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1598
1599         /*
1600          * Before changing anything, first check that the update RSS operation
1601          * does not attempt to disable RSS, if RSS was enabled at
1602          * initialization time, or does not attempt to enable RSS, if RSS was
1603          * disabled at initialization time.
1604          */
1605         rss_hf = rss_conf->rss_hf & IGB_RSS_OFFLOAD_ALL;
1606         mrqc = E1000_READ_REG(hw, E1000_MRQC);
1607         if (!(mrqc & E1000_MRQC_ENABLE_MASK)) { /* RSS disabled */
1608                 if (rss_hf != 0) /* Enable RSS */
1609                         return -(EINVAL);
1610                 return 0; /* Nothing to do */
1611         }
1612         /* RSS enabled */
1613         if (rss_hf == 0) /* Disable RSS */
1614                 return -(EINVAL);
1615         igb_hw_rss_hash_set(hw, rss_conf);
1616         return 0;
1617 }
1618
1619 int eth_igb_rss_hash_conf_get(struct rte_eth_dev *dev,
1620                               struct rte_eth_rss_conf *rss_conf)
1621 {
1622         struct e1000_hw *hw;
1623         uint8_t *hash_key;
1624         uint32_t rss_key;
1625         uint32_t mrqc;
1626         uint64_t rss_hf;
1627         uint16_t i;
1628
1629         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1630         hash_key = rss_conf->rss_key;
1631         if (hash_key != NULL) {
1632                 /* Return RSS hash key */
1633                 for (i = 0; i < 10; i++) {
1634                         rss_key = E1000_READ_REG_ARRAY(hw, E1000_RSSRK(0), i);
1635                         hash_key[(i * 4)] = rss_key & 0x000000FF;
1636                         hash_key[(i * 4) + 1] = (rss_key >> 8) & 0x000000FF;
1637                         hash_key[(i * 4) + 2] = (rss_key >> 16) & 0x000000FF;
1638                         hash_key[(i * 4) + 3] = (rss_key >> 24) & 0x000000FF;
1639                 }
1640         }
1641
1642         /* Get RSS functions configured in MRQC register */
1643         mrqc = E1000_READ_REG(hw, E1000_MRQC);
1644         if ((mrqc & E1000_MRQC_ENABLE_RSS_4Q) == 0) { /* RSS is disabled */
1645                 rss_conf->rss_hf = 0;
1646                 return 0;
1647         }
1648         rss_hf = 0;
1649         if (mrqc & E1000_MRQC_RSS_FIELD_IPV4)
1650                 rss_hf |= ETH_RSS_IPV4;
1651         if (mrqc & E1000_MRQC_RSS_FIELD_IPV4_TCP)
1652                 rss_hf |= ETH_RSS_IPV4_TCP;
1653         if (mrqc & E1000_MRQC_RSS_FIELD_IPV6)
1654                 rss_hf |= ETH_RSS_IPV6;
1655         if (mrqc & E1000_MRQC_RSS_FIELD_IPV6_EX)
1656                 rss_hf |= ETH_RSS_IPV6_EX;
1657         if (mrqc & E1000_MRQC_RSS_FIELD_IPV6_TCP)
1658                 rss_hf |= ETH_RSS_IPV6_TCP;
1659         if (mrqc & E1000_MRQC_RSS_FIELD_IPV6_TCP_EX)
1660                 rss_hf |= ETH_RSS_IPV6_TCP_EX;
1661         if (mrqc & E1000_MRQC_RSS_FIELD_IPV4_UDP)
1662                 rss_hf |= ETH_RSS_IPV4_UDP;
1663         if (mrqc & E1000_MRQC_RSS_FIELD_IPV6_UDP)
1664                 rss_hf |= ETH_RSS_IPV6_UDP;
1665         if (mrqc & E1000_MRQC_RSS_FIELD_IPV6_UDP_EX)
1666                 rss_hf |= ETH_RSS_IPV6_UDP_EX;
1667         rss_conf->rss_hf = rss_hf;
1668         return 0;
1669 }
1670
1671 static void
1672 igb_rss_configure(struct rte_eth_dev *dev)
1673 {
1674         struct rte_eth_rss_conf rss_conf;
1675         struct e1000_hw *hw;
1676         uint32_t shift;
1677         uint16_t i;
1678
1679         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1680
1681         /* Fill in redirection table. */
1682         shift = (hw->mac.type == e1000_82575) ? 6 : 0;
1683         for (i = 0; i < 128; i++) {
1684                 union e1000_reta {
1685                         uint32_t dword;
1686                         uint8_t  bytes[4];
1687                 } reta;
1688                 uint8_t q_idx;
1689
1690                 q_idx = (uint8_t) ((dev->data->nb_rx_queues > 1) ?
1691                                    i % dev->data->nb_rx_queues : 0);
1692                 reta.bytes[i & 3] = (uint8_t) (q_idx << shift);
1693                 if ((i & 3) == 3)
1694                         E1000_WRITE_REG(hw, E1000_RETA(i >> 2), reta.dword);
1695         }
1696
1697         /*
1698          * Configure the RSS key and the RSS protocols used to compute
1699          * the RSS hash of input packets.
1700          */
1701         rss_conf = dev->data->dev_conf.rx_adv_conf.rss_conf;
1702         if ((rss_conf.rss_hf & IGB_RSS_OFFLOAD_ALL) == 0) {
1703                 igb_rss_disable(dev);
1704                 return;
1705         }
1706         if (rss_conf.rss_key == NULL)
1707                 rss_conf.rss_key = rss_intel_key; /* Default hash key */
1708         igb_hw_rss_hash_set(hw, &rss_conf);
1709 }
1710
1711 /*
1712  * Check if the mac type support VMDq or not.
1713  * Return 1 if it supports, otherwise, return 0.
1714  */
1715 static int
1716 igb_is_vmdq_supported(const struct rte_eth_dev *dev)
1717 {
1718         const struct e1000_hw *hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1719
1720         switch (hw->mac.type) {
1721         case e1000_82576:
1722         case e1000_82580:
1723         case e1000_i350:
1724                 return 1;
1725         case e1000_82540:
1726         case e1000_82541:
1727         case e1000_82542:
1728         case e1000_82543:
1729         case e1000_82544:
1730         case e1000_82545:
1731         case e1000_82546:
1732         case e1000_82547:
1733         case e1000_82571:
1734         case e1000_82572:
1735         case e1000_82573:
1736         case e1000_82574:
1737         case e1000_82583:
1738         case e1000_i210:
1739         case e1000_i211:
1740         default:
1741                 PMD_INIT_LOG(ERR, "Cannot support VMDq feature\n");
1742                 return 0;
1743         }
1744 }
1745
1746 static int
1747 igb_vmdq_rx_hw_configure(struct rte_eth_dev *dev)
1748 {
1749         struct rte_eth_vmdq_rx_conf *cfg;
1750         struct e1000_hw *hw;
1751         uint32_t mrqc, vt_ctl, vmolr, rctl;
1752         int i;
1753
1754         PMD_INIT_LOG(DEBUG, ">>");
1755         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1756         cfg = &dev->data->dev_conf.rx_adv_conf.vmdq_rx_conf;
1757
1758         /* Check if mac type can support VMDq, return value of 0 means NOT support */
1759         if (igb_is_vmdq_supported(dev) == 0)
1760                 return -1;
1761
1762         igb_rss_disable(dev);
1763
1764         /* RCTL: eanble VLAN filter */
1765         rctl = E1000_READ_REG(hw, E1000_RCTL);
1766         rctl |= E1000_RCTL_VFE;
1767         E1000_WRITE_REG(hw, E1000_RCTL, rctl);
1768
1769         /* MRQC: enable vmdq */
1770         mrqc = E1000_READ_REG(hw, E1000_MRQC);
1771         mrqc |= E1000_MRQC_ENABLE_VMDQ;
1772         E1000_WRITE_REG(hw, E1000_MRQC, mrqc);
1773
1774         /* VTCTL:  pool selection according to VLAN tag */
1775         vt_ctl = E1000_READ_REG(hw, E1000_VT_CTL);
1776         if (cfg->enable_default_pool)
1777                 vt_ctl |= (cfg->default_pool << E1000_VT_CTL_DEFAULT_POOL_SHIFT);
1778         vt_ctl |= E1000_VT_CTL_IGNORE_MAC;
1779         E1000_WRITE_REG(hw, E1000_VT_CTL, vt_ctl);
1780
1781         /*
1782          * VMOLR: set STRVLAN as 1 if IGMAC in VTCTL is set as 1
1783          * Both 82576 and 82580 support it
1784          */
1785         if (hw->mac.type != e1000_i350) {
1786                 for (i = 0; i < E1000_VMOLR_SIZE; i++) {
1787                         vmolr = E1000_READ_REG(hw, E1000_VMOLR(i));
1788                         vmolr |= E1000_VMOLR_STRVLAN;
1789                         E1000_WRITE_REG(hw, E1000_VMOLR(i), vmolr);
1790                 }
1791         }
1792
1793         /* VFTA - enable all vlan filters */
1794         for (i = 0; i < IGB_VFTA_SIZE; i++)
1795                 E1000_WRITE_REG(hw, (E1000_VFTA+(i*4)), UINT32_MAX);
1796
1797         /* VFRE: 8 pools enabling for rx, both 82576 and i350 support it */
1798         if (hw->mac.type != e1000_82580)
1799                 E1000_WRITE_REG(hw, E1000_VFRE, E1000_MBVFICR_VFREQ_MASK);
1800
1801         /*
1802          * RAH/RAL - allow pools to read specific mac addresses
1803          * In this case, all pools should be able to read from mac addr 0
1804          */
1805         E1000_WRITE_REG(hw, E1000_RAH(0), (E1000_RAH_AV | UINT16_MAX));
1806         E1000_WRITE_REG(hw, E1000_RAL(0), UINT32_MAX);
1807
1808         /* VLVF: set up filters for vlan tags as configured */
1809         for (i = 0; i < cfg->nb_pool_maps; i++) {
1810                 /* set vlan id in VF register and set the valid bit */
1811                 E1000_WRITE_REG(hw, E1000_VLVF(i), (E1000_VLVF_VLANID_ENABLE | \
1812                         (cfg->pool_map[i].vlan_id & ETH_VLAN_ID_MAX) | \
1813                         ((cfg->pool_map[i].pools << E1000_VLVF_POOLSEL_SHIFT ) & \
1814                         E1000_VLVF_POOLSEL_MASK)));
1815         }
1816
1817         E1000_WRITE_FLUSH(hw);
1818
1819         return 0;
1820 }
1821
1822
1823 /*********************************************************************
1824  *
1825  *  Enable receive unit.
1826  *
1827  **********************************************************************/
1828
1829 static int
1830 igb_alloc_rx_queue_mbufs(struct igb_rx_queue *rxq)
1831 {
1832         struct igb_rx_entry *rxe = rxq->sw_ring;
1833         uint64_t dma_addr;
1834         unsigned i;
1835
1836         /* Initialize software ring entries. */
1837         for (i = 0; i < rxq->nb_rx_desc; i++) {
1838                 volatile union e1000_adv_rx_desc *rxd;
1839                 struct rte_mbuf *mbuf = rte_rxmbuf_alloc(rxq->mb_pool);
1840
1841                 if (mbuf == NULL) {
1842                         PMD_INIT_LOG(ERR, "RX mbuf alloc failed "
1843                                      "queue_id=%hu\n", rxq->queue_id);
1844                         return (-ENOMEM);
1845                 }
1846                 dma_addr =
1847                         rte_cpu_to_le_64(RTE_MBUF_DATA_DMA_ADDR_DEFAULT(mbuf));
1848                 rxd = &rxq->rx_ring[i];
1849                 rxd->read.hdr_addr = dma_addr;
1850                 rxd->read.pkt_addr = dma_addr;
1851                 rxe[i].mbuf = mbuf;
1852         }
1853
1854         return 0;
1855 }
1856
1857 #define E1000_MRQC_DEF_Q_SHIFT               (3)
1858 static int
1859 igb_dev_mq_rx_configure(struct rte_eth_dev *dev)
1860 {
1861         struct e1000_hw *hw =
1862                 E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1863         uint32_t mrqc;
1864
1865         if (RTE_ETH_DEV_SRIOV(dev).active == ETH_8_POOLS) {
1866                 /*
1867                  * SRIOV active scheme
1868                  * FIXME if support RSS together with VMDq & SRIOV
1869                  */
1870                 mrqc = E1000_MRQC_ENABLE_VMDQ;
1871                 /* 011b Def_Q ignore, according to VT_CTL.DEF_PL */
1872                 mrqc |= 0x3 << E1000_MRQC_DEF_Q_SHIFT;
1873                 E1000_WRITE_REG(hw, E1000_MRQC, mrqc);
1874         } else if(RTE_ETH_DEV_SRIOV(dev).active == 0) {
1875                 /*
1876                  * SRIOV inactive scheme
1877                  */
1878                 switch (dev->data->dev_conf.rxmode.mq_mode) {
1879                         case ETH_MQ_RX_RSS:
1880                                 igb_rss_configure(dev);
1881                                 break;
1882                         case ETH_MQ_RX_VMDQ_ONLY:
1883                                 /*Configure general VMDQ only RX parameters*/
1884                                 igb_vmdq_rx_hw_configure(dev);
1885                                 break;
1886                         case ETH_MQ_RX_NONE:
1887                                 /* if mq_mode is none, disable rss mode.*/
1888                         default:
1889                                 igb_rss_disable(dev);
1890                                 break;
1891                 }
1892         }
1893
1894         return 0;
1895 }
1896
1897 int
1898 eth_igb_rx_init(struct rte_eth_dev *dev)
1899 {
1900         struct e1000_hw     *hw;
1901         struct igb_rx_queue *rxq;
1902         struct rte_pktmbuf_pool_private *mbp_priv;
1903         uint32_t rctl;
1904         uint32_t rxcsum;
1905         uint32_t srrctl;
1906         uint16_t buf_size;
1907         uint16_t rctl_bsize;
1908         uint16_t i;
1909         int ret;
1910
1911         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
1912         srrctl = 0;
1913
1914         /*
1915          * Make sure receives are disabled while setting
1916          * up the descriptor ring.
1917          */
1918         rctl = E1000_READ_REG(hw, E1000_RCTL);
1919         E1000_WRITE_REG(hw, E1000_RCTL, rctl & ~E1000_RCTL_EN);
1920
1921         /*
1922          * Configure support of jumbo frames, if any.
1923          */
1924         if (dev->data->dev_conf.rxmode.jumbo_frame == 1) {
1925                 rctl |= E1000_RCTL_LPE;
1926
1927                 /*
1928                  * Set maximum packet length by default, and might be updated
1929                  * together with enabling/disabling dual VLAN.
1930                  */
1931                 E1000_WRITE_REG(hw, E1000_RLPML,
1932                         dev->data->dev_conf.rxmode.max_rx_pkt_len +
1933                                                 VLAN_TAG_SIZE);
1934         } else
1935                 rctl &= ~E1000_RCTL_LPE;
1936
1937         /* Configure and enable each RX queue. */
1938         rctl_bsize = 0;
1939         dev->rx_pkt_burst = eth_igb_recv_pkts;
1940         for (i = 0; i < dev->data->nb_rx_queues; i++) {
1941                 uint64_t bus_addr;
1942                 uint32_t rxdctl;
1943
1944                 rxq = dev->data->rx_queues[i];
1945
1946                 /* Allocate buffers for descriptor rings and set up queue */
1947                 ret = igb_alloc_rx_queue_mbufs(rxq);
1948                 if (ret)
1949                         return ret;
1950
1951                 /*
1952                  * Reset crc_len in case it was changed after queue setup by a
1953                  *  call to configure
1954                  */
1955                 rxq->crc_len =
1956                         (uint8_t)(dev->data->dev_conf.rxmode.hw_strip_crc ?
1957                                                         0 : ETHER_CRC_LEN);
1958
1959                 bus_addr = rxq->rx_ring_phys_addr;
1960                 E1000_WRITE_REG(hw, E1000_RDLEN(rxq->reg_idx),
1961                                 rxq->nb_rx_desc *
1962                                 sizeof(union e1000_adv_rx_desc));
1963                 E1000_WRITE_REG(hw, E1000_RDBAH(rxq->reg_idx),
1964                                 (uint32_t)(bus_addr >> 32));
1965                 E1000_WRITE_REG(hw, E1000_RDBAL(rxq->reg_idx), (uint32_t)bus_addr);
1966
1967                 srrctl = E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
1968
1969                 /*
1970                  * Configure RX buffer size.
1971                  */
1972                 mbp_priv = rte_mempool_get_priv(rxq->mb_pool);
1973                 buf_size = (uint16_t) (mbp_priv->mbuf_data_room_size -
1974                                        RTE_PKTMBUF_HEADROOM);
1975                 if (buf_size >= 1024) {
1976                         /*
1977                          * Configure the BSIZEPACKET field of the SRRCTL
1978                          * register of the queue.
1979                          * Value is in 1 KB resolution, from 1 KB to 127 KB.
1980                          * If this field is equal to 0b, then RCTL.BSIZE
1981                          * determines the RX packet buffer size.
1982                          */
1983                         srrctl |= ((buf_size >> E1000_SRRCTL_BSIZEPKT_SHIFT) &
1984                                    E1000_SRRCTL_BSIZEPKT_MASK);
1985                         buf_size = (uint16_t) ((srrctl &
1986                                                 E1000_SRRCTL_BSIZEPKT_MASK) <<
1987                                                E1000_SRRCTL_BSIZEPKT_SHIFT);
1988
1989                         /* It adds dual VLAN length for supporting dual VLAN */
1990                         if ((dev->data->dev_conf.rxmode.max_rx_pkt_len +
1991                                                 2 * VLAN_TAG_SIZE) > buf_size){
1992                                 dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
1993                                 dev->data->scattered_rx = 1;
1994                         }
1995                 } else {
1996                         /*
1997                          * Use BSIZE field of the device RCTL register.
1998                          */
1999                         if ((rctl_bsize == 0) || (rctl_bsize > buf_size))
2000                                 rctl_bsize = buf_size;
2001                         dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
2002                         dev->data->scattered_rx = 1;
2003                 }
2004
2005                 /* Set if packets are dropped when no descriptors available */
2006                 if (rxq->drop_en)
2007                         srrctl |= E1000_SRRCTL_DROP_EN;
2008
2009                 E1000_WRITE_REG(hw, E1000_SRRCTL(rxq->reg_idx), srrctl);
2010
2011                 /* Enable this RX queue. */
2012                 rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(rxq->reg_idx));
2013                 rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
2014                 rxdctl &= 0xFFF00000;
2015                 rxdctl |= (rxq->pthresh & 0x1F);
2016                 rxdctl |= ((rxq->hthresh & 0x1F) << 8);
2017                 rxdctl |= ((rxq->wthresh & 0x1F) << 16);
2018                 E1000_WRITE_REG(hw, E1000_RXDCTL(rxq->reg_idx), rxdctl);
2019         }
2020
2021         if (dev->data->dev_conf.rxmode.enable_scatter) {
2022                 dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
2023                 dev->data->scattered_rx = 1;
2024         }
2025
2026         /*
2027          * Setup BSIZE field of RCTL register, if needed.
2028          * Buffer sizes >= 1024 are not [supposed to be] setup in the RCTL
2029          * register, since the code above configures the SRRCTL register of
2030          * the RX queue in such a case.
2031          * All configurable sizes are:
2032          * 16384: rctl |= (E1000_RCTL_SZ_16384 | E1000_RCTL_BSEX);
2033          *  8192: rctl |= (E1000_RCTL_SZ_8192  | E1000_RCTL_BSEX);
2034          *  4096: rctl |= (E1000_RCTL_SZ_4096  | E1000_RCTL_BSEX);
2035          *  2048: rctl |= E1000_RCTL_SZ_2048;
2036          *  1024: rctl |= E1000_RCTL_SZ_1024;
2037          *   512: rctl |= E1000_RCTL_SZ_512;
2038          *   256: rctl |= E1000_RCTL_SZ_256;
2039          */
2040         if (rctl_bsize > 0) {
2041                 if (rctl_bsize >= 512) /* 512 <= buf_size < 1024 - use 512 */
2042                         rctl |= E1000_RCTL_SZ_512;
2043                 else /* 256 <= buf_size < 512 - use 256 */
2044                         rctl |= E1000_RCTL_SZ_256;
2045         }
2046
2047         /*
2048          * Configure RSS if device configured with multiple RX queues.
2049          */
2050         igb_dev_mq_rx_configure(dev);
2051
2052         /* Update the rctl since igb_dev_mq_rx_configure may change its value */
2053         rctl |= E1000_READ_REG(hw, E1000_RCTL);
2054
2055         /*
2056          * Setup the Checksum Register.
2057          * Receive Full-Packet Checksum Offload is mutually exclusive with RSS.
2058          */
2059         rxcsum = E1000_READ_REG(hw, E1000_RXCSUM);
2060         rxcsum |= E1000_RXCSUM_PCSD;
2061
2062         /* Enable both L3/L4 rx checksum offload */
2063         if (dev->data->dev_conf.rxmode.hw_ip_checksum)
2064                 rxcsum |= (E1000_RXCSUM_IPOFL  | E1000_RXCSUM_TUOFL);
2065         else
2066                 rxcsum &= ~(E1000_RXCSUM_IPOFL | E1000_RXCSUM_TUOFL);
2067         E1000_WRITE_REG(hw, E1000_RXCSUM, rxcsum);
2068
2069         /* Setup the Receive Control Register. */
2070         if (dev->data->dev_conf.rxmode.hw_strip_crc) {
2071                 rctl |= E1000_RCTL_SECRC; /* Strip Ethernet CRC. */
2072
2073                 /* set STRCRC bit in all queues */
2074                 if (hw->mac.type == e1000_i350 ||
2075                     hw->mac.type == e1000_i210 ||
2076                     hw->mac.type == e1000_i211 ||
2077                     hw->mac.type == e1000_i354) {
2078                         for (i = 0; i < dev->data->nb_rx_queues; i++) {
2079                                 rxq = dev->data->rx_queues[i];
2080                                 uint32_t dvmolr = E1000_READ_REG(hw,
2081                                         E1000_DVMOLR(rxq->reg_idx));
2082                                 dvmolr |= E1000_DVMOLR_STRCRC;
2083                                 E1000_WRITE_REG(hw, E1000_DVMOLR(rxq->reg_idx), dvmolr);
2084                         }
2085                 }
2086         } else {
2087                 rctl &= ~E1000_RCTL_SECRC; /* Do not Strip Ethernet CRC. */
2088
2089                 /* clear STRCRC bit in all queues */
2090                 if (hw->mac.type == e1000_i350 ||
2091                     hw->mac.type == e1000_i210 ||
2092                     hw->mac.type == e1000_i211 ||
2093                     hw->mac.type == e1000_i354) {
2094                         for (i = 0; i < dev->data->nb_rx_queues; i++) {
2095                                 rxq = dev->data->rx_queues[i];
2096                                 uint32_t dvmolr = E1000_READ_REG(hw,
2097                                         E1000_DVMOLR(rxq->reg_idx));
2098                                 dvmolr &= ~E1000_DVMOLR_STRCRC;
2099                                 E1000_WRITE_REG(hw, E1000_DVMOLR(rxq->reg_idx), dvmolr);
2100                         }
2101                 }
2102         }
2103
2104         rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
2105         rctl |= E1000_RCTL_EN | E1000_RCTL_BAM | E1000_RCTL_LBM_NO |
2106                 E1000_RCTL_RDMTS_HALF |
2107                 (hw->mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
2108
2109         /* Make sure VLAN Filters are off. */
2110         if (dev->data->dev_conf.rxmode.mq_mode != ETH_MQ_RX_VMDQ_ONLY)
2111                 rctl &= ~E1000_RCTL_VFE;
2112         /* Don't store bad packets. */
2113         rctl &= ~E1000_RCTL_SBP;
2114
2115         /* Enable Receives. */
2116         E1000_WRITE_REG(hw, E1000_RCTL, rctl);
2117
2118         /*
2119          * Setup the HW Rx Head and Tail Descriptor Pointers.
2120          * This needs to be done after enable.
2121          */
2122         for (i = 0; i < dev->data->nb_rx_queues; i++) {
2123                 rxq = dev->data->rx_queues[i];
2124                 E1000_WRITE_REG(hw, E1000_RDH(rxq->reg_idx), 0);
2125                 E1000_WRITE_REG(hw, E1000_RDT(rxq->reg_idx), rxq->nb_rx_desc - 1);
2126         }
2127
2128         return 0;
2129 }
2130
2131 /*********************************************************************
2132  *
2133  *  Enable transmit unit.
2134  *
2135  **********************************************************************/
2136 void
2137 eth_igb_tx_init(struct rte_eth_dev *dev)
2138 {
2139         struct e1000_hw     *hw;
2140         struct igb_tx_queue *txq;
2141         uint32_t tctl;
2142         uint32_t txdctl;
2143         uint16_t i;
2144
2145         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
2146
2147         /* Setup the Base and Length of the Tx Descriptor Rings. */
2148         for (i = 0; i < dev->data->nb_tx_queues; i++) {
2149                 uint64_t bus_addr;
2150                 txq = dev->data->tx_queues[i];
2151                 bus_addr = txq->tx_ring_phys_addr;
2152
2153                 E1000_WRITE_REG(hw, E1000_TDLEN(txq->reg_idx),
2154                                 txq->nb_tx_desc *
2155                                 sizeof(union e1000_adv_tx_desc));
2156                 E1000_WRITE_REG(hw, E1000_TDBAH(txq->reg_idx),
2157                                 (uint32_t)(bus_addr >> 32));
2158                 E1000_WRITE_REG(hw, E1000_TDBAL(txq->reg_idx), (uint32_t)bus_addr);
2159
2160                 /* Setup the HW Tx Head and Tail descriptor pointers. */
2161                 E1000_WRITE_REG(hw, E1000_TDT(txq->reg_idx), 0);
2162                 E1000_WRITE_REG(hw, E1000_TDH(txq->reg_idx), 0);
2163
2164                 /* Setup Transmit threshold registers. */
2165                 txdctl = E1000_READ_REG(hw, E1000_TXDCTL(txq->reg_idx));
2166                 txdctl |= txq->pthresh & 0x1F;
2167                 txdctl |= ((txq->hthresh & 0x1F) << 8);
2168                 txdctl |= ((txq->wthresh & 0x1F) << 16);
2169                 txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
2170                 E1000_WRITE_REG(hw, E1000_TXDCTL(txq->reg_idx), txdctl);
2171         }
2172
2173         /* Program the Transmit Control Register. */
2174         tctl = E1000_READ_REG(hw, E1000_TCTL);
2175         tctl &= ~E1000_TCTL_CT;
2176         tctl |= (E1000_TCTL_PSP | E1000_TCTL_RTLC | E1000_TCTL_EN |
2177                  (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT));
2178
2179         e1000_config_collision_dist(hw);
2180
2181         /* This write will effectively turn on the transmit unit. */
2182         E1000_WRITE_REG(hw, E1000_TCTL, tctl);
2183 }
2184
2185 /*********************************************************************
2186  *
2187  *  Enable VF receive unit.
2188  *
2189  **********************************************************************/
2190 int
2191 eth_igbvf_rx_init(struct rte_eth_dev *dev)
2192 {
2193         struct e1000_hw     *hw;
2194         struct igb_rx_queue *rxq;
2195         struct rte_pktmbuf_pool_private *mbp_priv;
2196         uint32_t srrctl;
2197         uint16_t buf_size;
2198         uint16_t rctl_bsize;
2199         uint16_t i;
2200         int ret;
2201
2202         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
2203
2204         /* setup MTU */
2205         e1000_rlpml_set_vf(hw,
2206                 (uint16_t)(dev->data->dev_conf.rxmode.max_rx_pkt_len +
2207                 VLAN_TAG_SIZE));
2208
2209         /* Configure and enable each RX queue. */
2210         rctl_bsize = 0;
2211         dev->rx_pkt_burst = eth_igb_recv_pkts;
2212         for (i = 0; i < dev->data->nb_rx_queues; i++) {
2213                 uint64_t bus_addr;
2214                 uint32_t rxdctl;
2215
2216                 rxq = dev->data->rx_queues[i];
2217
2218                 /* Allocate buffers for descriptor rings and set up queue */
2219                 ret = igb_alloc_rx_queue_mbufs(rxq);
2220                 if (ret)
2221                         return ret;
2222
2223                 bus_addr = rxq->rx_ring_phys_addr;
2224                 E1000_WRITE_REG(hw, E1000_RDLEN(i),
2225                                 rxq->nb_rx_desc *
2226                                 sizeof(union e1000_adv_rx_desc));
2227                 E1000_WRITE_REG(hw, E1000_RDBAH(i),
2228                                 (uint32_t)(bus_addr >> 32));
2229                 E1000_WRITE_REG(hw, E1000_RDBAL(i), (uint32_t)bus_addr);
2230
2231                 srrctl = E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
2232
2233                 /*
2234                  * Configure RX buffer size.
2235                  */
2236                 mbp_priv = rte_mempool_get_priv(rxq->mb_pool);
2237                 buf_size = (uint16_t) (mbp_priv->mbuf_data_room_size -
2238                                        RTE_PKTMBUF_HEADROOM);
2239                 if (buf_size >= 1024) {
2240                         /*
2241                          * Configure the BSIZEPACKET field of the SRRCTL
2242                          * register of the queue.
2243                          * Value is in 1 KB resolution, from 1 KB to 127 KB.
2244                          * If this field is equal to 0b, then RCTL.BSIZE
2245                          * determines the RX packet buffer size.
2246                          */
2247                         srrctl |= ((buf_size >> E1000_SRRCTL_BSIZEPKT_SHIFT) &
2248                                    E1000_SRRCTL_BSIZEPKT_MASK);
2249                         buf_size = (uint16_t) ((srrctl &
2250                                                 E1000_SRRCTL_BSIZEPKT_MASK) <<
2251                                                E1000_SRRCTL_BSIZEPKT_SHIFT);
2252
2253                         /* It adds dual VLAN length for supporting dual VLAN */
2254                         if ((dev->data->dev_conf.rxmode.max_rx_pkt_len +
2255                                                 2 * VLAN_TAG_SIZE) > buf_size){
2256                                 dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
2257                                 dev->data->scattered_rx = 1;
2258                         }
2259                 } else {
2260                         /*
2261                          * Use BSIZE field of the device RCTL register.
2262                          */
2263                         if ((rctl_bsize == 0) || (rctl_bsize > buf_size))
2264                                 rctl_bsize = buf_size;
2265                         dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
2266                         dev->data->scattered_rx = 1;
2267                 }
2268
2269                 /* Set if packets are dropped when no descriptors available */
2270                 if (rxq->drop_en)
2271                         srrctl |= E1000_SRRCTL_DROP_EN;
2272
2273                 E1000_WRITE_REG(hw, E1000_SRRCTL(i), srrctl);
2274
2275                 /* Enable this RX queue. */
2276                 rxdctl = E1000_READ_REG(hw, E1000_RXDCTL(i));
2277                 rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
2278                 rxdctl &= 0xFFF00000;
2279                 rxdctl |= (rxq->pthresh & 0x1F);
2280                 rxdctl |= ((rxq->hthresh & 0x1F) << 8);
2281                 if (hw->mac.type == e1000_vfadapt) {
2282                         /*
2283                          * Workaround of 82576 VF Erratum
2284                          * force set WTHRESH to 1
2285                          * to avoid Write-Back not triggered sometimes
2286                          */
2287                         rxdctl |= 0x10000;
2288                         PMD_INIT_LOG(DEBUG, "Force set RX WTHRESH to 1 !\n");
2289                 }
2290                 else
2291                         rxdctl |= ((rxq->wthresh & 0x1F) << 16);
2292                 E1000_WRITE_REG(hw, E1000_RXDCTL(i), rxdctl);
2293         }
2294
2295         if (dev->data->dev_conf.rxmode.enable_scatter) {
2296                 dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
2297                 dev->data->scattered_rx = 1;
2298         }
2299
2300         /*
2301          * Setup the HW Rx Head and Tail Descriptor Pointers.
2302          * This needs to be done after enable.
2303          */
2304         for (i = 0; i < dev->data->nb_rx_queues; i++) {
2305                 rxq = dev->data->rx_queues[i];
2306                 E1000_WRITE_REG(hw, E1000_RDH(i), 0);
2307                 E1000_WRITE_REG(hw, E1000_RDT(i), rxq->nb_rx_desc - 1);
2308         }
2309
2310         return 0;
2311 }
2312
2313 /*********************************************************************
2314  *
2315  *  Enable VF transmit unit.
2316  *
2317  **********************************************************************/
2318 void
2319 eth_igbvf_tx_init(struct rte_eth_dev *dev)
2320 {
2321         struct e1000_hw     *hw;
2322         struct igb_tx_queue *txq;
2323         uint32_t txdctl;
2324         uint16_t i;
2325
2326         hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
2327
2328         /* Setup the Base and Length of the Tx Descriptor Rings. */
2329         for (i = 0; i < dev->data->nb_tx_queues; i++) {
2330                 uint64_t bus_addr;
2331
2332                 txq = dev->data->tx_queues[i];
2333                 bus_addr = txq->tx_ring_phys_addr;
2334                 E1000_WRITE_REG(hw, E1000_TDLEN(i),
2335                                 txq->nb_tx_desc *
2336                                 sizeof(union e1000_adv_tx_desc));
2337                 E1000_WRITE_REG(hw, E1000_TDBAH(i),
2338                                 (uint32_t)(bus_addr >> 32));
2339                 E1000_WRITE_REG(hw, E1000_TDBAL(i), (uint32_t)bus_addr);
2340
2341                 /* Setup the HW Tx Head and Tail descriptor pointers. */
2342                 E1000_WRITE_REG(hw, E1000_TDT(i), 0);
2343                 E1000_WRITE_REG(hw, E1000_TDH(i), 0);
2344
2345                 /* Setup Transmit threshold registers. */
2346                 txdctl = E1000_READ_REG(hw, E1000_TXDCTL(i));
2347                 txdctl |= txq->pthresh & 0x1F;
2348                 txdctl |= ((txq->hthresh & 0x1F) << 8);
2349                 if (hw->mac.type == e1000_82576) {
2350                         /*
2351                          * Workaround of 82576 VF Erratum
2352                          * force set WTHRESH to 1
2353                          * to avoid Write-Back not triggered sometimes
2354                          */
2355                         txdctl |= 0x10000;
2356                         PMD_INIT_LOG(DEBUG, "Force set TX WTHRESH to 1 !\n");
2357                 }
2358                 else
2359                         txdctl |= ((txq->wthresh & 0x1F) << 16);
2360                 txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
2361                 E1000_WRITE_REG(hw, E1000_TXDCTL(i), txdctl);
2362         }
2363
2364 }
2365