hw/xilinx_axienet.c

   1 /*
   2  * QEMU model of Xilinx AXI-Ethernet.
   3  *
   4  * Copyright (c) 2011 Edgar E. Iglesias.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "sysbus.h"
  26 #include "qemu-char.h"
  27 #include "qemu-log.h"
  28 #include "net.h"
  29 #include "net/checksum.h"
  30
  31 #include "xilinx_axidma.h"
  32
  33 #define DPHY(x)
  34
  35 /* Advertisement control register. */
  36 #define ADVERTISE_10HALF        0x0020  /* Try for 10mbps half-duplex  */
  37 #define ADVERTISE_10FULL        0x0040  /* Try for 10mbps full-duplex  */
  38 #define ADVERTISE_100HALF       0x0080  /* Try for 100mbps half-duplex */
  39 #define ADVERTISE_100FULL       0x0100  /* Try for 100mbps full-duplex */
  40
  41 struct PHY {
  42     uint32_t regs[32];
  43
  44     int link;
  45
  46     unsigned int (*read)(struct PHY *phy, unsigned int req);
  47     void (*write)(struct PHY *phy, unsigned int req,
  48                   unsigned int data);
  49 };
  50
  51 static unsigned int tdk_read(struct PHY *phy, unsigned int req)
  52 {
  53     int regnum;
  54     unsigned r = 0;
  55
  56     regnum = req & 0x1f;
  57
  58     switch (regnum) {
  59         case 1:
  60             if (!phy->link) {
  61                 break;
  62             }
  63             /* MR1.  */
  64             /* Speeds and modes.  */
  65             r |= (1 << 13) | (1 << 14);
  66             r |= (1 << 11) | (1 << 12);
  67             r |= (1 << 5); /* Autoneg complete.  */
  68             r |= (1 << 3); /* Autoneg able.  */
  69             r |= (1 << 2); /* link.  */
  70             r |= (1 << 1); /* link.  */
  71             break;
  72         case 5:
  73             /* Link partner ability.
  74                We are kind; always agree with whatever best mode
  75                the guest advertises.  */
  76             r = 1 << 14; /* Success.  */
  77             /* Copy advertised modes.  */
  78             r |= phy->regs[4] & (15 << 5);
  79             /* Autoneg support.  */
  80             r |= 1;
  81             break;
  82         case 17:
  83             /* Marvel PHY on many xilinx boards.  */
  84             r = 0x8000; /* 1000Mb  */
  85             break;
  86         case 18:
  87             {
  88                 /* Diagnostics reg.  */
  89                 int duplex = 0;
  90                 int speed_100 = 0;
  91
  92                 if (!phy->link) {
  93                     break;
  94                 }
  95
  96                 /* Are we advertising 100 half or 100 duplex ? */
  97                 speed_100 = !!(phy->regs[4] & ADVERTISE_100HALF);
  98                 speed_100 |= !!(phy->regs[4] & ADVERTISE_100FULL);
  99
 100                 /* Are we advertising 10 duplex or 100 duplex ? */
 101                 duplex = !!(phy->regs[4] & ADVERTISE_100FULL);
 102                 duplex |= !!(phy->regs[4] & ADVERTISE_10FULL);
 103                 r = (speed_100 << 10) | (duplex << 11);
 104             }
 105             break;
 106
 107         default:
 108             r = phy->regs[regnum];
 109             break;
 110     }
 111     DPHY(qemu_log("\n%s %x = reg[%d]\n", __func__, r, regnum));
 112     return r;
 113 }
 114
 115 static void
 116 tdk_write(struct PHY *phy, unsigned int req, unsigned int data)
 117 {
 118     int regnum;
 119
 120     regnum = req & 0x1f;
 121     DPHY(qemu_log("%s reg[%d] = %x\n", __func__, regnum, data));
 122     switch (regnum) {
 123         default:
 124             phy->regs[regnum] = data;
 125             break;
 126     }
 127 }
 128
 129 static void
 130 tdk_init(struct PHY *phy)
 131 {
 132     phy->regs[0] = 0x3100;
 133     /* PHY Id.  */
 134     phy->regs[2] = 0x0300;
 135     phy->regs[3] = 0xe400;
 136     /* Autonegotiation advertisement reg.  */
 137     phy->regs[4] = 0x01E1;
 138     phy->link = 1;
 139
 140     phy->read = tdk_read;
 141     phy->write = tdk_write;
 142 }
 143
 144 struct MDIOBus {
 145     /* bus.  */
 146     int mdc;
 147     int mdio;
 148
 149     /* decoder.  */
 150     enum {
 151         PREAMBLE,
 152         SOF,
 153         OPC,
 154         ADDR,
 155         REQ,
 156         TURNAROUND,
 157         DATA
 158     } state;
 159     unsigned int drive;
 160
 161     unsigned int cnt;
 162     unsigned int addr;
 163     unsigned int opc;
 164     unsigned int req;
 165     unsigned int data;
 166
 167     struct PHY *devs[32];
 168 };
 169
 170 static void
 171 mdio_attach(struct MDIOBus *bus, struct PHY *phy, unsigned int addr)
 172 {
 173     bus->devs[addr & 0x1f] = phy;
 174 }
 175
 176 #ifdef USE_THIS_DEAD_CODE
 177 static void
 178 mdio_detach(struct MDIOBus *bus, struct PHY *phy, unsigned int addr)
 179 {
 180     bus->devs[addr & 0x1f] = NULL;
 181 }
 182 #endif
 183
 184 static uint16_t mdio_read_req(struct MDIOBus *bus, unsigned int addr,
 185                   unsigned int reg)
 186 {
 187     struct PHY *phy;
 188     uint16_t data;
 189
 190     phy = bus->devs[addr];
 191     if (phy && phy->read) {
 192         data = phy->read(phy, reg);
 193     } else {
 194         data = 0xffff;
 195     }
 196     DPHY(qemu_log("%s addr=%d reg=%d data=%x\n", __func__, addr, reg, data));
 197     return data;
 198 }
 199
 200 static void mdio_write_req(struct MDIOBus *bus, unsigned int addr,
 201                unsigned int reg, uint16_t data)
 202 {
 203     struct PHY *phy;
 204
 205     DPHY(qemu_log("%s addr=%d reg=%d data=%x\n", __func__, addr, reg, data));
 206     phy = bus->devs[addr];
 207     if (phy && phy->write) {
 208         phy->write(phy, reg, data);
 209     }
 210 }
 211
 212 #define DENET(x)
 213
 214 #define R_RAF      (0x000 / 4)
 215 enum {
 216     RAF_MCAST_REJ = (1 << 1),
 217     RAF_BCAST_REJ = (1 << 2),
 218     RAF_EMCF_EN = (1 << 12),
 219     RAF_NEWFUNC_EN = (1 << 11)
 220 };
 221
 222 #define R_IS       (0x00C / 4)
 223 enum {
 224     IS_HARD_ACCESS_COMPLETE = 1,
 225     IS_AUTONEG = (1 << 1),
 226     IS_RX_COMPLETE = (1 << 2),
 227     IS_RX_REJECT = (1 << 3),
 228     IS_TX_COMPLETE = (1 << 5),
 229     IS_RX_DCM_LOCK = (1 << 6),
 230     IS_MGM_RDY = (1 << 7),
 231     IS_PHY_RST_DONE = (1 << 8),
 232 };
 233
 234 #define R_IP       (0x010 / 4)
 235 #define R_IE       (0x014 / 4)
 236 #define R_UAWL     (0x020 / 4)
 237 #define R_UAWU     (0x024 / 4)
 238 #define R_PPST     (0x030 / 4)
 239 enum {
 240     PPST_LINKSTATUS = (1 << 0),
 241     PPST_PHY_LINKSTATUS = (1 << 7),
 242 };
 243
 244 #define R_STATS_RX_BYTESL (0x200 / 4)
 245 #define R_STATS_RX_BYTESH (0x204 / 4)
 246 #define R_STATS_TX_BYTESL (0x208 / 4)
 247 #define R_STATS_TX_BYTESH (0x20C / 4)
 248 #define R_STATS_RXL       (0x290 / 4)
 249 #define R_STATS_RXH       (0x294 / 4)
 250 #define R_STATS_RX_BCASTL (0x2a0 / 4)
 251 #define R_STATS_RX_BCASTH (0x2a4 / 4)
 252 #define R_STATS_RX_MCASTL (0x2a8 / 4)
 253 #define R_STATS_RX_MCASTH (0x2ac / 4)
 254
 255 #define R_RCW0     (0x400 / 4)
 256 #define R_RCW1     (0x404 / 4)
 257 enum {
 258     RCW1_VLAN = (1 << 27),
 259     RCW1_RX   = (1 << 28),
 260     RCW1_FCS  = (1 << 29),
 261     RCW1_JUM  = (1 << 30),
 262     RCW1_RST  = (1 << 31),
 263 };
 264
 265 #define R_TC       (0x408 / 4)
 266 enum {
 267     TC_VLAN = (1 << 27),
 268     TC_TX   = (1 << 28),
 269     TC_FCS  = (1 << 29),
 270     TC_JUM  = (1 << 30),
 271     TC_RST  = (1 << 31),
 272 };
 273
 274 #define R_EMMC     (0x410 / 4)
 275 enum {
 276     EMMC_LINKSPEED_10MB = (0 << 30),
 277     EMMC_LINKSPEED_100MB = (1 << 30),
 278     EMMC_LINKSPEED_1000MB = (2 << 30),
 279 };
 280
 281 #define R_PHYC     (0x414 / 4)
 282
 283 #define R_MC       (0x500 / 4)
 284 #define MC_EN      (1 << 6)
 285
 286 #define R_MCR      (0x504 / 4)
 287 #define R_MWD      (0x508 / 4)
 288 #define R_MRD      (0x50c / 4)
 289 #define R_MIS      (0x600 / 4)
 290 #define R_MIP      (0x620 / 4)
 291 #define R_MIE      (0x640 / 4)
 292 #define R_MIC      (0x640 / 4)
 293
 294 #define R_UAW0     (0x700 / 4)
 295 #define R_UAW1     (0x704 / 4)
 296 #define R_FMI      (0x708 / 4)
 297 #define R_AF0      (0x710 / 4)
 298 #define R_AF1      (0x714 / 4)
 299 #define R_MAX      (0x34 / 4)
 300
 301 /* Indirect registers.  */
 302 struct TEMAC  {
 303     struct MDIOBus mdio_bus;
 304     struct PHY phy;
 305
 306     void *parent;
 307 };
 308
 309 struct XilinxAXIEnet {
 310     SysBusDevice busdev;
 311     MemoryRegion iomem;
 312     qemu_irq irq;
 313     void *dmach;
 314     NICState *nic;
 315     NICConf conf;
 316
 317
 318     uint32_t c_rxmem;
 319     uint32_t c_txmem;
 320     uint32_t c_phyaddr;
 321
 322     struct TEMAC TEMAC;
 323
 324     /* MII regs.  */
 325     union {
 326         uint32_t regs[4];
 327         struct {
 328             uint32_t mc;
 329             uint32_t mcr;
 330             uint32_t mwd;
 331             uint32_t mrd;
 332         };
 333     } mii;
 334
 335     struct {
 336         uint64_t rx_bytes;
 337         uint64_t tx_bytes;
 338
 339         uint64_t rx;
 340         uint64_t rx_bcast;
 341         uint64_t rx_mcast;
 342     } stats;
 343
 344     /* Receive configuration words.  */
 345     uint32_t rcw[2];
 346     /* Transmit config.  */
 347     uint32_t tc;
 348     uint32_t emmc;
 349     uint32_t phyc;
 350
 351     /* Unicast Address Word.  */
 352     uint32_t uaw[2];
 353     /* Unicast address filter used with extended mcast.  */
 354     uint32_t ext_uaw[2];
 355     uint32_t fmi;
 356
 357     uint32_t regs[R_MAX];
 358
 359     /* Multicast filter addrs.  */
 360     uint32_t maddr[4][2];
 361     /* 32K x 1 lookup filter.  */
 362     uint32_t ext_mtable[1024];
 363
 364
 365     uint8_t *rxmem;
 366 };
 367
 368 static void axienet_rx_reset(struct XilinxAXIEnet *s)
 369 {
 370     s->rcw[1] = RCW1_JUM | RCW1_FCS | RCW1_RX | RCW1_VLAN;
 371 }
 372
 373 static void axienet_tx_reset(struct XilinxAXIEnet *s)
 374 {
 375     s->tc = TC_JUM | TC_TX | TC_VLAN;
 376 }
 377
 378 static inline int axienet_rx_resetting(struct XilinxAXIEnet *s)
 379 {
 380     return s->rcw[1] & RCW1_RST;
 381 }
 382
 383 static inline int axienet_rx_enabled(struct XilinxAXIEnet *s)
 384 {
 385     return s->rcw[1] & RCW1_RX;
 386 }
 387
 388 static inline int axienet_extmcf_enabled(struct XilinxAXIEnet *s)
 389 {
 390     return !!(s->regs[R_RAF] & RAF_EMCF_EN);
 391 }
 392
 393 static inline int axienet_newfunc_enabled(struct XilinxAXIEnet *s)
 394 {
 395     return !!(s->regs[R_RAF] & RAF_NEWFUNC_EN);
 396 }
 397
 398 static void axienet_reset(struct XilinxAXIEnet *s)
 399 {
 400     axienet_rx_reset(s);
 401     axienet_tx_reset(s);
 402
 403     s->regs[R_PPST] = PPST_LINKSTATUS | PPST_PHY_LINKSTATUS;
 404     s->regs[R_IS] = IS_AUTONEG | IS_RX_DCM_LOCK | IS_MGM_RDY | IS_PHY_RST_DONE;
 405
 406     s->emmc = EMMC_LINKSPEED_100MB;
 407 }
 408
 409 static void enet_update_irq(struct XilinxAXIEnet *s)
 410 {
 411     s->regs[R_IP] = s->regs[R_IS] & s->regs[R_IE];
 412     qemu_set_irq(s->irq, !!s->regs[R_IP]);
 413 }
 414
 415 static uint64_t enet_read(void *opaque, target_phys_addr_t addr, unsigned size)
 416 {
 417     struct XilinxAXIEnet *s = opaque;
 418     uint32_t r = 0;
 419     addr >>= 2;
 420
 421     switch (addr) {
 422         case R_RCW0:
 423         case R_RCW1:
 424             r = s->rcw[addr & 1];
 425             break;
 426
 427         case R_TC:
 428             r = s->tc;
 429             break;
 430
 431         case R_EMMC:
 432             r = s->emmc;
 433             break;
 434
 435         case R_PHYC:
 436             r = s->phyc;
 437             break;
 438
 439         case R_MCR:
 440             r = s->mii.regs[addr & 3] | (1 << 7); /* Always ready.  */
 441             break;
 442
 443         case R_STATS_RX_BYTESL:
 444         case R_STATS_RX_BYTESH:
 445             r = s->stats.rx_bytes >> (32 * (addr & 1));
 446             break;
 447
 448         case R_STATS_TX_BYTESL:
 449         case R_STATS_TX_BYTESH:
 450             r = s->stats.tx_bytes >> (32 * (addr & 1));
 451             break;
 452
 453         case R_STATS_RXL:
 454         case R_STATS_RXH:
 455             r = s->stats.rx >> (32 * (addr & 1));
 456             break;
 457         case R_STATS_RX_BCASTL:
 458         case R_STATS_RX_BCASTH:
 459             r = s->stats.rx_bcast >> (32 * (addr & 1));
 460             break;
 461         case R_STATS_RX_MCASTL:
 462         case R_STATS_RX_MCASTH:
 463             r = s->stats.rx_mcast >> (32 * (addr & 1));
 464             break;
 465
 466         case R_MC:
 467         case R_MWD:
 468         case R_MRD:
 469             r = s->mii.regs[addr & 3];
 470             break;
 471
 472         case R_UAW0:
 473         case R_UAW1:
 474             r = s->uaw[addr & 1];
 475             break;
 476
 477         case R_UAWU:
 478         case R_UAWL:
 479             r = s->ext_uaw[addr & 1];
 480             break;
 481
 482         case R_FMI:
 483             r = s->fmi;
 484             break;
 485
 486         case R_AF0:
 487         case R_AF1:
 488             r = s->maddr[s->fmi & 3][addr & 1];
 489             break;
 490
 491         case 0x8000 ... 0x83ff:
 492             r = s->ext_mtable[addr - 0x8000];
 493             break;
 494
 495         default:
 496             if (addr < ARRAY_SIZE(s->regs)) {
 497                 r = s->regs[addr];
 498             }
 499             DENET(qemu_log("%s addr=" TARGET_FMT_plx " v=%x\n",
 500                             __func__, addr * 4, r));
 501             break;
 502     }
 503     return r;
 504 }
 505
 506 static void enet_write(void *opaque, target_phys_addr_t addr,
 507                        uint64_t value, unsigned size)
 508 {
 509     struct XilinxAXIEnet *s = opaque;
 510     struct TEMAC *t = &s->TEMAC;
 511
 512     addr >>= 2;
 513     switch (addr) {
 514         case R_RCW0:
 515         case R_RCW1:
 516             s->rcw[addr & 1] = value;
 517             if ((addr & 1) && value & RCW1_RST) {
 518                 axienet_rx_reset(s);
 519             }
 520             break;
 521
 522         case R_TC:
 523             s->tc = value;
 524             if (value & TC_RST) {
 525                 axienet_tx_reset(s);
 526             }
 527             break;
 528
 529         case R_EMMC:
 530             s->emmc = value;
 531             break;
 532
 533         case R_PHYC:
 534             s->phyc = value;
 535             break;
 536
 537         case R_MC:
 538              value &= ((1 < 7) - 1);
 539
 540              /* Enable the MII.  */
 541              if (value & MC_EN) {
 542                  unsigned int miiclkdiv = value & ((1 << 6) - 1);
 543                  if (!miiclkdiv) {
 544                      qemu_log("AXIENET: MDIO enabled but MDIOCLK is zero!\n");
 545                  }
 546              }
 547              s->mii.mc = value;
 548              break;
 549
 550         case R_MCR: {
 551              unsigned int phyaddr = (value >> 24) & 0x1f;
 552              unsigned int regaddr = (value >> 16) & 0x1f;
 553              unsigned int op = (value >> 14) & 3;
 554              unsigned int initiate = (value >> 11) & 1;
 555
 556              if (initiate) {
 557                  if (op == 1) {
 558                      mdio_write_req(&t->mdio_bus, phyaddr, regaddr, s->mii.mwd);
 559                  } else if (op == 2) {
 560                      s->mii.mrd = mdio_read_req(&t->mdio_bus, phyaddr, regaddr);
 561                  } else {
 562                      qemu_log("AXIENET: invalid MDIOBus OP=%d\n", op);
 563                  }
 564              }
 565              s->mii.mcr = value;
 566              break;
 567         }
 568
 569         case R_MWD:
 570         case R_MRD:
 571              s->mii.regs[addr & 3] = value;
 572              break;
 573
 574
 575         case R_UAW0:
 576         case R_UAW1:
 577             s->uaw[addr & 1] = value;
 578             break;
 579
 580         case R_UAWL:
 581         case R_UAWU:
 582             s->ext_uaw[addr & 1] = value;
 583             break;
 584
 585         case R_FMI:
 586             s->fmi = value;
 587             break;
 588
 589         case R_AF0:
 590         case R_AF1:
 591             s->maddr[s->fmi & 3][addr & 1] = value;
 592             break;
 593
 594         case 0x8000 ... 0x83ff:
 595             s->ext_mtable[addr - 0x8000] = value;
 596             break;
 597
 598         default:
 599             DENET(qemu_log("%s addr=" TARGET_FMT_plx " v=%x\n",
 600                            __func__, addr * 4, (unsigned)value));
 601             if (addr < ARRAY_SIZE(s->regs)) {
 602                 s->regs[addr] = value;
 603             }
 604             break;
 605     }
 606     enet_update_irq(s);
 607 }
 608
 609 static const MemoryRegionOps enet_ops = {
 610     .read = enet_read,
 611     .write = enet_write,
 612     .endianness = DEVICE_LITTLE_ENDIAN,
 613 };
 614
 615 static int eth_can_rx(VLANClientState *nc)
 616 {
 617     struct XilinxAXIEnet *s = DO_UPCAST(NICState, nc, nc)->opaque;
 618
 619     /* RX enabled?  */
 620     return !axienet_rx_resetting(s) && axienet_rx_enabled(s);
 621 }
 622
 623 static int enet_match_addr(const uint8_t *buf, uint32_t f0, uint32_t f1)
 624 {
 625     int match = 1;
 626
 627     if (memcmp(buf, &f0, 4)) {
 628         match = 0;
 629     }
 630
 631     if (buf[4] != (f1 & 0xff) || buf[5] != ((f1 >> 8) & 0xff)) {
 632         match = 0;
 633     }
 634
 635     return match;
 636 }
 637
 638 static ssize_t eth_rx(VLANClientState *nc, const uint8_t *buf, size_t size)
 639 {
 640     struct XilinxAXIEnet *s = DO_UPCAST(NICState, nc, nc)->opaque;
 641     static const unsigned char sa_bcast[6] = {0xff, 0xff, 0xff,
 642                                               0xff, 0xff, 0xff};
 643     static const unsigned char sa_ipmcast[3] = {0x01, 0x00, 0x52};
 644     uint32_t app[6] = {0};
 645     int promisc = s->fmi & (1 << 31);
 646     int unicast, broadcast, multicast, ip_multicast = 0;
 647     uint32_t csum32;
 648     uint16_t csum16;
 649     int i;
 650
 651     s = s;
 652     DENET(qemu_log("%s: %zd bytes\n", __func__, size));
 653
 654     unicast = ~buf[0] & 0x1;
 655     broadcast = memcmp(buf, sa_bcast, 6) == 0;
 656     multicast = !unicast && !broadcast;
 657     if (multicast && (memcmp(sa_ipmcast, buf, sizeof sa_ipmcast) == 0)) {
 658         ip_multicast = 1;
 659     }
 660
 661     /* Jumbo or vlan sizes ?  */
 662     if (!(s->rcw[1] & RCW1_JUM)) {
 663         if (size > 1518 && size <= 1522 && !(s->rcw[1] & RCW1_VLAN)) {
 664             return size;
 665         }
 666     }
 667
 668     /* Basic Address filters.  If you want to use the extended filters
 669        you'll generally have to place the ethernet mac into promiscuous mode
 670        to avoid the basic filtering from dropping most frames.  */
 671     if (!promisc) {
 672         if (unicast) {
 673             if (!enet_match_addr(buf, s->uaw[0], s->uaw[1])) {
 674                 return size;
 675             }
 676         } else {
 677             if (broadcast) {
 678                 /* Broadcast.  */
 679                 if (s->regs[R_RAF] & RAF_BCAST_REJ) {
 680                     return size;
 681                 }
 682             } else {
 683                 int drop = 1;
 684
 685                 /* Multicast.  */
 686                 if (s->regs[R_RAF] & RAF_MCAST_REJ) {
 687                     return size;
 688                 }
 689
 690                 for (i = 0; i < 4; i++) {
 691                     if (enet_match_addr(buf, s->maddr[i][0], s->maddr[i][1])) {
 692                         drop = 0;
 693                         break;
 694                     }
 695                 }
 696
 697                 if (drop) {
 698                     return size;
 699                 }
 700             }
 701         }
 702     }
 703
 704     /* Extended mcast filtering enabled?  */
 705     if (axienet_newfunc_enabled(s) && axienet_extmcf_enabled(s)) {
 706         if (unicast) {
 707             if (!enet_match_addr(buf, s->ext_uaw[0], s->ext_uaw[1])) {
 708                 return size;
 709             }
 710         } else {
 711             if (broadcast) {
 712                 /* Broadcast. ???  */
 713                 if (s->regs[R_RAF] & RAF_BCAST_REJ) {
 714                     return size;
 715                 }
 716             } else {
 717                 int idx, bit;
 718
 719                 /* Multicast.  */
 720                 if (!memcmp(buf, sa_ipmcast, 3)) {
 721                     return size;
 722                 }
 723
 724                 idx  = (buf[4] & 0x7f) << 8;
 725                 idx |= buf[5];
 726
 727                 bit = 1 << (idx & 0x1f);
 728                 idx >>= 5;
 729
 730                 if (!(s->ext_mtable[idx] & bit)) {
 731                     return size;
 732                 }
 733             }
 734         }
 735     }
 736
 737     if (size < 12) {
 738         s->regs[R_IS] |= IS_RX_REJECT;
 739         enet_update_irq(s);
 740         return -1;
 741     }
 742
 743     if (size > (s->c_rxmem - 4)) {
 744         size = s->c_rxmem - 4;
 745     }
 746
 747     memcpy(s->rxmem, buf, size);
 748     memset(s->rxmem + size, 0, 4); /* Clear the FCS.  */
 749
 750     if (s->rcw[1] & RCW1_FCS) {
 751         size += 4; /* fcs is inband.  */
 752     }
 753
 754     app[0] = 5 << 28;
 755     csum32 = net_checksum_add(size - 14, (uint8_t *)s->rxmem + 14);
 756     /* Fold it once.  */
 757     csum32 = (csum32 & 0xffff) + (csum32 >> 16);
 758     /* And twice to get rid of possible carries.  */
 759     csum16 = (csum32 & 0xffff) + (csum32 >> 16);
 760     app[3] = csum16;
 761     app[4] = size & 0xffff;
 762
 763     s->stats.rx_bytes += size;
 764     s->stats.rx++;
 765     if (multicast) {
 766         s->stats.rx_mcast++;
 767         app[2] |= 1 | (ip_multicast << 1);
 768     } else if (broadcast) {
 769         s->stats.rx_bcast++;
 770         app[2] |= 1 << 3;
 771     }
 772
 773     /* Good frame.  */
 774     app[2] |= 1 << 6;
 775
 776     xlx_dma_push_to_dma(s->dmach, (void *)s->rxmem, size, app);
 777
 778     s->regs[R_IS] |= IS_RX_COMPLETE;
 779     enet_update_irq(s);
 780     return size;
 781 }
 782
 783 static void eth_cleanup(VLANClientState *nc)
 784 {
 785     /* FIXME.  */
 786     struct XilinxAXIEnet *s = DO_UPCAST(NICState, nc, nc)->opaque;
 787     g_free(s->rxmem);
 788     g_free(s);
 789 }
 790
 791 static void
 792 axienet_stream_push(void *opaque, uint8_t *buf, size_t size, uint32_t *hdr)
 793 {
 794     struct XilinxAXIEnet *s = opaque;
 795
 796     /* TX enable ?  */
 797     if (!(s->tc & TC_TX)) {
 798         return;
 799     }
 800
 801     /* Jumbo or vlan sizes ?  */
 802     if (!(s->tc & TC_JUM)) {
 803         if (size > 1518 && size <= 1522 && !(s->tc & TC_VLAN)) {
 804             return;
 805         }
 806     }
 807
 808     if (hdr[0] & 1) {
 809         unsigned int start_off = hdr[1] >> 16;
 810         unsigned int write_off = hdr[1] & 0xffff;
 811         uint32_t tmp_csum;
 812         uint16_t csum;
 813
 814         tmp_csum = net_checksum_add(size - start_off,
 815                                     (uint8_t *)buf + start_off);
 816         /* Accumulate the seed.  */
 817         tmp_csum += hdr[2] & 0xffff;
 818
 819         /* Fold the 32bit partial checksum.  */
 820         csum = net_checksum_finish(tmp_csum);
 821
 822         /* Writeback.  */
 823         buf[write_off] = csum >> 8;
 824         buf[write_off + 1] = csum & 0xff;
 825     }
 826
 827     qemu_send_packet(&s->nic->nc, buf, size);
 828
 829     s->stats.tx_bytes += size;
 830     s->regs[R_IS] |= IS_TX_COMPLETE;
 831     enet_update_irq(s);
 832 }
 833
 834 static NetClientInfo net_xilinx_enet_info = {
 835     .type = NET_CLIENT_TYPE_NIC,
 836     .size = sizeof(NICState),
 837     .can_receive = eth_can_rx,
 838     .receive = eth_rx,
 839     .cleanup = eth_cleanup,
 840 };
 841
 842 static int xilinx_enet_init(SysBusDevice *dev)
 843 {
 844     struct XilinxAXIEnet *s = FROM_SYSBUS(typeof(*s), dev);
 845
 846     sysbus_init_irq(dev, &s->irq);
 847
 848     if (!s->dmach) {
 849         hw_error("Unconnected Xilinx Ethernet MAC.\n");
 850     }
 851
 852     xlx_dma_connect_client(s->dmach, s, axienet_stream_push);
 853
 854     memory_region_init_io(&s->iomem, &enet_ops, s, "enet", 0x40000);
 855     sysbus_init_mmio(dev, &s->iomem);
 856
 857     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 858     s->nic = qemu_new_nic(&net_xilinx_enet_info, &s->conf,
 859                           dev->qdev.info->name, dev->qdev.id, s);
 860     qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);
 861
 862     tdk_init(&s->TEMAC.phy);
 863     mdio_attach(&s->TEMAC.mdio_bus, &s->TEMAC.phy, s->c_phyaddr);
 864
 865     s->TEMAC.parent = s;
 866
 867     s->rxmem = g_malloc(s->c_rxmem);
 868     axienet_reset(s);
 869
 870     return 0;
 871 }
 872
 873 static SysBusDeviceInfo xilinx_enet_info = {
 874     .init = xilinx_enet_init,
 875     .qdev.name  = "xilinx,axienet",
 876     .qdev.size  = sizeof(struct XilinxAXIEnet),
 877     .qdev.props = (Property[]) {
 878         DEFINE_PROP_UINT32("phyaddr", struct XilinxAXIEnet, c_phyaddr, 7),
 879         DEFINE_PROP_UINT32("c_rxmem", struct XilinxAXIEnet, c_rxmem, 0x1000),
 880         DEFINE_PROP_UINT32("c_txmem", struct XilinxAXIEnet, c_txmem, 0x1000),
 881         DEFINE_PROP_PTR("dmach", struct XilinxAXIEnet, dmach),
 882         DEFINE_NIC_PROPERTIES(struct XilinxAXIEnet, conf),
 883         DEFINE_PROP_END_OF_LIST(),
 884     }
 885 };
 886 static void xilinx_enet_register(void)
 887 {
 888     sysbus_register_withprop(&xilinx_enet_info);
 889 }
 890
 891 device_init(xilinx_enet_register)