drivers/net/ethernet/sun/sunvnet.c

   1 /* sunvnet.c: Sun LDOM Virtual Network Driver.
   2  *
   3  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/slab.h>
  12 #include <linux/delay.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/ethtool.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/mutex.h>
  18
  19 #include <asm/vio.h>
  20 #include <asm/ldc.h>
  21
  22 #include "sunvnet.h"
  23
  24 #define DRV_MODULE_NAME         "sunvnet"
  25 #define DRV_MODULE_VERSION      "1.0"
  26 #define DRV_MODULE_RELDATE      "June 25, 2007"
  27
  28 static char version[] __devinitdata =
  29         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  30 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  31 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
  32 MODULE_LICENSE("GPL");
  33 MODULE_VERSION(DRV_MODULE_VERSION);
  34
  35 /* Ordered from largest major to lowest */
  36 static struct vio_version vnet_versions[] = {
  37         { .major = 1, .minor = 0 },
  38 };
  39
  40 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
  41 {
  42         return vio_dring_avail(dr, VNET_TX_RING_SIZE);
  43 }
  44
  45 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
  46 {
  47         struct vio_msg_tag *pkt = arg;
  48
  49         pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
  50                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
  51         pr_err("Resetting connection\n");
  52
  53         ldc_disconnect(port->vio.lp);
  54
  55         return -ECONNRESET;
  56 }
  57
  58 static int vnet_send_attr(struct vio_driver_state *vio)
  59 {
  60         struct vnet_port *port = to_vnet_port(vio);
  61         struct net_device *dev = port->vp->dev;
  62         struct vio_net_attr_info pkt;
  63         int i;
  64
  65         memset(&pkt, 0, sizeof(pkt));
  66         pkt.tag.type = VIO_TYPE_CTRL;
  67         pkt.tag.stype = VIO_SUBTYPE_INFO;
  68         pkt.tag.stype_env = VIO_ATTR_INFO;
  69         pkt.tag.sid = vio_send_sid(vio);
  70         pkt.xfer_mode = VIO_DRING_MODE;
  71         pkt.addr_type = VNET_ADDR_ETHERMAC;
  72         pkt.ack_freq = 0;
  73         for (i = 0; i < 6; i++)
  74                 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
  75         pkt.mtu = ETH_FRAME_LEN;
  76
  77         viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
  78                "ackfreq[%u] mtu[%llu]\n",
  79                pkt.xfer_mode, pkt.addr_type,
  80                (unsigned long long) pkt.addr,
  81                pkt.ack_freq,
  82                (unsigned long long) pkt.mtu);
  83
  84         return vio_ldc_send(vio, &pkt, sizeof(pkt));
  85 }
  86
  87 static int handle_attr_info(struct vio_driver_state *vio,
  88                             struct vio_net_attr_info *pkt)
  89 {
  90         viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
  91                "ackfreq[%u] mtu[%llu]\n",
  92                pkt->xfer_mode, pkt->addr_type,
  93                (unsigned long long) pkt->addr,
  94                pkt->ack_freq,
  95                (unsigned long long) pkt->mtu);
  96
  97         pkt->tag.sid = vio_send_sid(vio);
  98
  99         if (pkt->xfer_mode != VIO_DRING_MODE ||
 100             pkt->addr_type != VNET_ADDR_ETHERMAC ||
 101             pkt->mtu != ETH_FRAME_LEN) {
 102                 viodbg(HS, "SEND NET ATTR NACK\n");
 103
 104                 pkt->tag.stype = VIO_SUBTYPE_NACK;
 105
 106                 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
 107
 108                 return -ECONNRESET;
 109         } else {
 110                 viodbg(HS, "SEND NET ATTR ACK\n");
 111
 112                 pkt->tag.stype = VIO_SUBTYPE_ACK;
 113
 114                 return vio_ldc_send(vio, pkt, sizeof(*pkt));
 115         }
 116
 117 }
 118
 119 static int handle_attr_ack(struct vio_driver_state *vio,
 120                            struct vio_net_attr_info *pkt)
 121 {
 122         viodbg(HS, "GOT NET ATTR ACK\n");
 123
 124         return 0;
 125 }
 126
 127 static int handle_attr_nack(struct vio_driver_state *vio,
 128                             struct vio_net_attr_info *pkt)
 129 {
 130         viodbg(HS, "GOT NET ATTR NACK\n");
 131
 132         return -ECONNRESET;
 133 }
 134
 135 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
 136 {
 137         struct vio_net_attr_info *pkt = arg;
 138
 139         switch (pkt->tag.stype) {
 140         case VIO_SUBTYPE_INFO:
 141                 return handle_attr_info(vio, pkt);
 142
 143         case VIO_SUBTYPE_ACK:
 144                 return handle_attr_ack(vio, pkt);
 145
 146         case VIO_SUBTYPE_NACK:
 147                 return handle_attr_nack(vio, pkt);
 148
 149         default:
 150                 return -ECONNRESET;
 151         }
 152 }
 153
 154 static void vnet_handshake_complete(struct vio_driver_state *vio)
 155 {
 156         struct vio_dring_state *dr;
 157
 158         dr = &vio->drings[VIO_DRIVER_RX_RING];
 159         dr->snd_nxt = dr->rcv_nxt = 1;
 160
 161         dr = &vio->drings[VIO_DRIVER_TX_RING];
 162         dr->snd_nxt = dr->rcv_nxt = 1;
 163 }
 164
 165 /* The hypervisor interface that implements copying to/from imported
 166  * memory from another domain requires that copies are done to 8-byte
 167  * aligned buffers, and that the lengths of such copies are also 8-byte
 168  * multiples.
 169  *
 170  * So we align skb->data to an 8-byte multiple and pad-out the data
 171  * area so we can round the copy length up to the next multiple of
 172  * 8 for the copy.
 173  *
 174  * The transmitter puts the actual start of the packet 6 bytes into
 175  * the buffer it sends over, so that the IP headers after the ethernet
 176  * header are aligned properly.  These 6 bytes are not in the descriptor
 177  * length, they are simply implied.  This offset is represented using
 178  * the VNET_PACKET_SKIP macro.
 179  */
 180 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
 181                                            unsigned int len)
 182 {
 183         struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
 184         unsigned long addr, off;
 185
 186         if (unlikely(!skb))
 187                 return NULL;
 188
 189         addr = (unsigned long) skb->data;
 190         off = ((addr + 7UL) & ~7UL) - addr;
 191         if (off)
 192                 skb_reserve(skb, off);
 193
 194         return skb;
 195 }
 196
 197 static int vnet_rx_one(struct vnet_port *port, unsigned int len,
 198                        struct ldc_trans_cookie *cookies, int ncookies)
 199 {
 200         struct net_device *dev = port->vp->dev;
 201         unsigned int copy_len;
 202         struct sk_buff *skb;
 203         int err;
 204
 205         err = -EMSGSIZE;
 206         if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
 207                 dev->stats.rx_length_errors++;
 208                 goto out_dropped;
 209         }
 210
 211         skb = alloc_and_align_skb(dev, len);
 212         err = -ENOMEM;
 213         if (unlikely(!skb)) {
 214                 dev->stats.rx_missed_errors++;
 215                 goto out_dropped;
 216         }
 217
 218         copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
 219         skb_put(skb, copy_len);
 220         err = ldc_copy(port->vio.lp, LDC_COPY_IN,
 221                        skb->data, copy_len, 0,
 222                        cookies, ncookies);
 223         if (unlikely(err < 0)) {
 224                 dev->stats.rx_frame_errors++;
 225                 goto out_free_skb;
 226         }
 227
 228         skb_pull(skb, VNET_PACKET_SKIP);
 229         skb_trim(skb, len);
 230         skb->protocol = eth_type_trans(skb, dev);
 231
 232         dev->stats.rx_packets++;
 233         dev->stats.rx_bytes += len;
 234
 235         netif_rx(skb);
 236
 237         return 0;
 238
 239 out_free_skb:
 240         kfree_skb(skb);
 241
 242 out_dropped:
 243         dev->stats.rx_dropped++;
 244         return err;
 245 }
 246
 247 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
 248                          u32 start, u32 end, u8 vio_dring_state)
 249 {
 250         struct vio_dring_data hdr = {
 251                 .tag = {
 252                         .type           = VIO_TYPE_DATA,
 253                         .stype          = VIO_SUBTYPE_ACK,
 254                         .stype_env      = VIO_DRING_DATA,
 255                         .sid            = vio_send_sid(&port->vio),
 256                 },
 257                 .dring_ident            = dr->ident,
 258                 .start_idx              = start,
 259                 .end_idx                = end,
 260                 .state                  = vio_dring_state,
 261         };
 262         int err, delay;
 263
 264         hdr.seq = dr->snd_nxt;
 265         delay = 1;
 266         do {
 267                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
 268                 if (err > 0) {
 269                         dr->snd_nxt++;
 270                         break;
 271                 }
 272                 udelay(delay);
 273                 if ((delay <<= 1) > 128)
 274                         delay = 128;
 275         } while (err == -EAGAIN);
 276
 277         return err;
 278 }
 279
 280 static u32 next_idx(u32 idx, struct vio_dring_state *dr)
 281 {
 282         if (++idx == dr->num_entries)
 283                 idx = 0;
 284         return idx;
 285 }
 286
 287 static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
 288 {
 289         if (idx == 0)
 290                 idx = dr->num_entries - 1;
 291         else
 292                 idx--;
 293
 294         return idx;
 295 }
 296
 297 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
 298                                         struct vio_dring_state *dr,
 299                                         u32 index)
 300 {
 301         struct vio_net_desc *desc = port->vio.desc_buf;
 302         int err;
 303
 304         err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
 305                                   (index * dr->entry_size),
 306                                   dr->cookies, dr->ncookies);
 307         if (err < 0)
 308                 return ERR_PTR(err);
 309
 310         return desc;
 311 }
 312
 313 static int put_rx_desc(struct vnet_port *port,
 314                        struct vio_dring_state *dr,
 315                        struct vio_net_desc *desc,
 316                        u32 index)
 317 {
 318         int err;
 319
 320         err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
 321                                   (index * dr->entry_size),
 322                                   dr->cookies, dr->ncookies);
 323         if (err < 0)
 324                 return err;
 325
 326         return 0;
 327 }
 328
 329 static int vnet_walk_rx_one(struct vnet_port *port,
 330                             struct vio_dring_state *dr,
 331                             u32 index, int *needs_ack)
 332 {
 333         struct vio_net_desc *desc = get_rx_desc(port, dr, index);
 334         struct vio_driver_state *vio = &port->vio;
 335         int err;
 336
 337         if (IS_ERR(desc))
 338                 return PTR_ERR(desc);
 339
 340         viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
 341                desc->hdr.state, desc->hdr.ack,
 342                desc->size, desc->ncookies,
 343                desc->cookies[0].cookie_addr,
 344                desc->cookies[0].cookie_size);
 345
 346         if (desc->hdr.state != VIO_DESC_READY)
 347                 return 1;
 348         err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
 349         if (err == -ECONNRESET)
 350                 return err;
 351         desc->hdr.state = VIO_DESC_DONE;
 352         err = put_rx_desc(port, dr, desc, index);
 353         if (err < 0)
 354                 return err;
 355         *needs_ack = desc->hdr.ack;
 356         return 0;
 357 }
 358
 359 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
 360                         u32 start, u32 end)
 361 {
 362         struct vio_driver_state *vio = &port->vio;
 363         int ack_start = -1, ack_end = -1;
 364
 365         end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
 366
 367         viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
 368
 369         while (start != end) {
 370                 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
 371                 if (err == -ECONNRESET)
 372                         return err;
 373                 if (err != 0)
 374                         break;
 375                 if (ack_start == -1)
 376                         ack_start = start;
 377                 ack_end = start;
 378                 start = next_idx(start, dr);
 379                 if (ack && start != end) {
 380                         err = vnet_send_ack(port, dr, ack_start, ack_end,
 381                                             VIO_DRING_ACTIVE);
 382                         if (err == -ECONNRESET)
 383                                 return err;
 384                         ack_start = -1;
 385                 }
 386         }
 387         if (unlikely(ack_start == -1))
 388                 ack_start = ack_end = prev_idx(start, dr);
 389         return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
 390 }
 391
 392 static int vnet_rx(struct vnet_port *port, void *msgbuf)
 393 {
 394         struct vio_dring_data *pkt = msgbuf;
 395         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
 396         struct vio_driver_state *vio = &port->vio;
 397
 398         viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
 399                pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
 400
 401         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
 402                 return 0;
 403         if (unlikely(pkt->seq != dr->rcv_nxt)) {
 404                 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
 405                        pkt->seq, dr->rcv_nxt);
 406                 return 0;
 407         }
 408
 409         dr->rcv_nxt++;
 410
 411         /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
 412
 413         return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
 414 }
 415
 416 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
 417 {
 418         u32 idx = dr->cons;
 419         int found = 0;
 420
 421         while (idx != dr->prod) {
 422                 if (idx == end) {
 423                         found = 1;
 424                         break;
 425                 }
 426                 idx = next_idx(idx, dr);
 427         }
 428         return found;
 429 }
 430
 431 static int vnet_ack(struct vnet_port *port, void *msgbuf)
 432 {
 433         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 434         struct vio_dring_data *pkt = msgbuf;
 435         struct net_device *dev;
 436         struct vnet *vp;
 437         u32 end;
 438
 439         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
 440                 return 0;
 441
 442         end = pkt->end_idx;
 443         if (unlikely(!idx_is_pending(dr, end)))
 444                 return 0;
 445
 446         dr->cons = next_idx(end, dr);
 447
 448         vp = port->vp;
 449         dev = vp->dev;
 450         if (unlikely(netif_queue_stopped(dev) &&
 451                      vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
 452                 return 1;
 453
 454         return 0;
 455 }
 456
 457 static int vnet_nack(struct vnet_port *port, void *msgbuf)
 458 {
 459         /* XXX just reset or similar XXX */
 460         return 0;
 461 }
 462
 463 static int handle_mcast(struct vnet_port *port, void *msgbuf)
 464 {
 465         struct vio_net_mcast_info *pkt = msgbuf;
 466
 467         if (pkt->tag.stype != VIO_SUBTYPE_ACK)
 468                 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
 469                        port->vp->dev->name,
 470                        pkt->tag.type,
 471                        pkt->tag.stype,
 472                        pkt->tag.stype_env,
 473                        pkt->tag.sid);
 474
 475         return 0;
 476 }
 477
 478 static void maybe_tx_wakeup(struct vnet *vp)
 479 {
 480         struct net_device *dev = vp->dev;
 481
 482         netif_tx_lock(dev);
 483         if (likely(netif_queue_stopped(dev))) {
 484                 struct vnet_port *port;
 485                 int wake = 1;
 486
 487                 list_for_each_entry(port, &vp->port_list, list) {
 488                         struct vio_dring_state *dr;
 489
 490                         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 491                         if (vnet_tx_dring_avail(dr) <
 492                             VNET_TX_WAKEUP_THRESH(dr)) {
 493                                 wake = 0;
 494                                 break;
 495                         }
 496                 }
 497                 if (wake)
 498                         netif_wake_queue(dev);
 499         }
 500         netif_tx_unlock(dev);
 501 }
 502
 503 static void vnet_event(void *arg, int event)
 504 {
 505         struct vnet_port *port = arg;
 506         struct vio_driver_state *vio = &port->vio;
 507         unsigned long flags;
 508         int tx_wakeup, err;
 509
 510         spin_lock_irqsave(&vio->lock, flags);
 511
 512         if (unlikely(event == LDC_EVENT_RESET ||
 513                      event == LDC_EVENT_UP)) {
 514                 vio_link_state_change(vio, event);
 515                 spin_unlock_irqrestore(&vio->lock, flags);
 516
 517                 if (event == LDC_EVENT_RESET)
 518                         vio_port_up(vio);
 519                 return;
 520         }
 521
 522         if (unlikely(event != LDC_EVENT_DATA_READY)) {
 523                 pr_warning("Unexpected LDC event %d\n", event);
 524                 spin_unlock_irqrestore(&vio->lock, flags);
 525                 return;
 526         }
 527
 528         tx_wakeup = err = 0;
 529         while (1) {
 530                 union {
 531                         struct vio_msg_tag tag;
 532                         u64 raw[8];
 533                 } msgbuf;
 534
 535                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
 536                 if (unlikely(err < 0)) {
 537                         if (err == -ECONNRESET)
 538                                 vio_conn_reset(vio);
 539                         break;
 540                 }
 541                 if (err == 0)
 542                         break;
 543                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
 544                        msgbuf.tag.type,
 545                        msgbuf.tag.stype,
 546                        msgbuf.tag.stype_env,
 547                        msgbuf.tag.sid);
 548                 err = vio_validate_sid(vio, &msgbuf.tag);
 549                 if (err < 0)
 550                         break;
 551
 552                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
 553                         if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
 554                                 err = vnet_rx(port, &msgbuf);
 555                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
 556                                 err = vnet_ack(port, &msgbuf);
 557                                 if (err > 0)
 558                                         tx_wakeup |= err;
 559                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
 560                                 err = vnet_nack(port, &msgbuf);
 561                         }
 562                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
 563                         if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
 564                                 err = handle_mcast(port, &msgbuf);
 565                         else
 566                                 err = vio_control_pkt_engine(vio, &msgbuf);
 567                         if (err)
 568                                 break;
 569                 } else {
 570                         err = vnet_handle_unknown(port, &msgbuf);
 571                 }
 572                 if (err == -ECONNRESET)
 573                         break;
 574         }
 575         spin_unlock(&vio->lock);
 576         if (unlikely(tx_wakeup && err != -ECONNRESET))
 577                 maybe_tx_wakeup(port->vp);
 578         local_irq_restore(flags);
 579 }
 580
 581 static int __vnet_tx_trigger(struct vnet_port *port)
 582 {
 583         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 584         struct vio_dring_data hdr = {
 585                 .tag = {
 586                         .type           = VIO_TYPE_DATA,
 587                         .stype          = VIO_SUBTYPE_INFO,
 588                         .stype_env      = VIO_DRING_DATA,
 589                         .sid            = vio_send_sid(&port->vio),
 590                 },
 591                 .dring_ident            = dr->ident,
 592                 .start_idx              = dr->prod,
 593                 .end_idx                = (u32) -1,
 594         };
 595         int err, delay;
 596
 597         hdr.seq = dr->snd_nxt;
 598         delay = 1;
 599         do {
 600                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
 601                 if (err > 0) {
 602                         dr->snd_nxt++;
 603                         break;
 604                 }
 605                 udelay(delay);
 606                 if ((delay <<= 1) > 128)
 607                         delay = 128;
 608         } while (err == -EAGAIN);
 609
 610         return err;
 611 }
 612
 613 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
 614 {
 615         unsigned int hash = vnet_hashfn(skb->data);
 616         struct hlist_head *hp = &vp->port_hash[hash];
 617         struct hlist_node *n;
 618         struct vnet_port *port;
 619
 620         hlist_for_each_entry(port, n, hp, hash) {
 621                 if (!compare_ether_addr(port->raddr, skb->data))
 622                         return port;
 623         }
 624         port = NULL;
 625         if (!list_empty(&vp->port_list))
 626                 port = list_entry(vp->port_list.next, struct vnet_port, list);
 627
 628         return port;
 629 }
 630
 631 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
 632 {
 633         struct vnet_port *ret;
 634         unsigned long flags;
 635
 636         spin_lock_irqsave(&vp->lock, flags);
 637         ret = __tx_port_find(vp, skb);
 638         spin_unlock_irqrestore(&vp->lock, flags);
 639
 640         return ret;
 641 }
 642
 643 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 644 {
 645         struct vnet *vp = netdev_priv(dev);
 646         struct vnet_port *port = tx_port_find(vp, skb);
 647         struct vio_dring_state *dr;
 648         struct vio_net_desc *d;
 649         unsigned long flags;
 650         unsigned int len;
 651         void *tx_buf;
 652         int i, err;
 653
 654         if (unlikely(!port))
 655                 goto out_dropped;
 656
 657         spin_lock_irqsave(&port->vio.lock, flags);
 658
 659         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 660         if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
 661                 if (!netif_queue_stopped(dev)) {
 662                         netif_stop_queue(dev);
 663
 664                         /* This is a hard error, log it. */
 665                         netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
 666                         dev->stats.tx_errors++;
 667                 }
 668                 spin_unlock_irqrestore(&port->vio.lock, flags);
 669                 return NETDEV_TX_BUSY;
 670         }
 671
 672         d = vio_dring_cur(dr);
 673
 674         tx_buf = port->tx_bufs[dr->prod].buf;
 675         skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
 676
 677         len = skb->len;
 678         if (len < ETH_ZLEN) {
 679                 len = ETH_ZLEN;
 680                 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
 681         }
 682
 683         d->hdr.ack = VIO_ACK_ENABLE;
 684         d->size = len;
 685         d->ncookies = port->tx_bufs[dr->prod].ncookies;
 686         for (i = 0; i < d->ncookies; i++)
 687                 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
 688
 689         /* This has to be a non-SMP write barrier because we are writing
 690          * to memory which is shared with the peer LDOM.
 691          */
 692         wmb();
 693
 694         d->hdr.state = VIO_DESC_READY;
 695
 696         err = __vnet_tx_trigger(port);
 697         if (unlikely(err < 0)) {
 698                 netdev_info(dev, "TX trigger error %d\n", err);
 699                 d->hdr.state = VIO_DESC_FREE;
 700                 dev->stats.tx_carrier_errors++;
 701                 goto out_dropped_unlock;
 702         }
 703
 704         dev->stats.tx_packets++;
 705         dev->stats.tx_bytes += skb->len;
 706
 707         dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
 708         if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
 709                 netif_stop_queue(dev);
 710                 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
 711                         netif_wake_queue(dev);
 712         }
 713
 714         spin_unlock_irqrestore(&port->vio.lock, flags);
 715
 716         dev_kfree_skb(skb);
 717
 718         return NETDEV_TX_OK;
 719
 720 out_dropped_unlock:
 721         spin_unlock_irqrestore(&port->vio.lock, flags);
 722
 723 out_dropped:
 724         dev_kfree_skb(skb);
 725         dev->stats.tx_dropped++;
 726         return NETDEV_TX_OK;
 727 }
 728
 729 static void vnet_tx_timeout(struct net_device *dev)
 730 {
 731         /* XXX Implement me XXX */
 732 }
 733
 734 static int vnet_open(struct net_device *dev)
 735 {
 736         netif_carrier_on(dev);
 737         netif_start_queue(dev);
 738
 739         return 0;
 740 }
 741
 742 static int vnet_close(struct net_device *dev)
 743 {
 744         netif_stop_queue(dev);
 745         netif_carrier_off(dev);
 746
 747         return 0;
 748 }
 749
 750 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
 751 {
 752         struct vnet_mcast_entry *m;
 753
 754         for (m = vp->mcast_list; m; m = m->next) {
 755                 if (!memcmp(m->addr, addr, ETH_ALEN))
 756                         return m;
 757         }
 758         return NULL;
 759 }
 760
 761 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
 762 {
 763         struct netdev_hw_addr *ha;
 764
 765         netdev_for_each_mc_addr(ha, dev) {
 766                 struct vnet_mcast_entry *m;
 767
 768                 m = __vnet_mc_find(vp, ha->addr);
 769                 if (m) {
 770                         m->hit = 1;
 771                         continue;
 772                 }
 773
 774                 if (!m) {
 775                         m = kzalloc(sizeof(*m), GFP_ATOMIC);
 776                         if (!m)
 777                                 continue;
 778                         memcpy(m->addr, ha->addr, ETH_ALEN);
 779                         m->hit = 1;
 780
 781                         m->next = vp->mcast_list;
 782                         vp->mcast_list = m;
 783                 }
 784         }
 785 }
 786
 787 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
 788 {
 789         struct vio_net_mcast_info info;
 790         struct vnet_mcast_entry *m, **pp;
 791         int n_addrs;
 792
 793         memset(&info, 0, sizeof(info));
 794
 795         info.tag.type = VIO_TYPE_CTRL;
 796         info.tag.stype = VIO_SUBTYPE_INFO;
 797         info.tag.stype_env = VNET_MCAST_INFO;
 798         info.tag.sid = vio_send_sid(&port->vio);
 799         info.set = 1;
 800
 801         n_addrs = 0;
 802         for (m = vp->mcast_list; m; m = m->next) {
 803                 if (m->sent)
 804                         continue;
 805                 m->sent = 1;
 806                 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
 807                        m->addr, ETH_ALEN);
 808                 if (++n_addrs == VNET_NUM_MCAST) {
 809                         info.count = n_addrs;
 810
 811                         (void) vio_ldc_send(&port->vio, &info,
 812                                             sizeof(info));
 813                         n_addrs = 0;
 814                 }
 815         }
 816         if (n_addrs) {
 817                 info.count = n_addrs;
 818                 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
 819         }
 820
 821         info.set = 0;
 822
 823         n_addrs = 0;
 824         pp = &vp->mcast_list;
 825         while ((m = *pp) != NULL) {
 826                 if (m->hit) {
 827                         m->hit = 0;
 828                         pp = &m->next;
 829                         continue;
 830                 }
 831
 832                 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
 833                        m->addr, ETH_ALEN);
 834                 if (++n_addrs == VNET_NUM_MCAST) {
 835                         info.count = n_addrs;
 836                         (void) vio_ldc_send(&port->vio, &info,
 837                                             sizeof(info));
 838                         n_addrs = 0;
 839                 }
 840
 841                 *pp = m->next;
 842                 kfree(m);
 843         }
 844         if (n_addrs) {
 845                 info.count = n_addrs;
 846                 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
 847         }
 848 }
 849
 850 static void vnet_set_rx_mode(struct net_device *dev)
 851 {
 852         struct vnet *vp = netdev_priv(dev);
 853         struct vnet_port *port;
 854         unsigned long flags;
 855
 856         spin_lock_irqsave(&vp->lock, flags);
 857         if (!list_empty(&vp->port_list)) {
 858                 port = list_entry(vp->port_list.next, struct vnet_port, list);
 859
 860                 if (port->switch_port) {
 861                         __update_mc_list(vp, dev);
 862                         __send_mc_list(vp, port);
 863                 }
 864         }
 865         spin_unlock_irqrestore(&vp->lock, flags);
 866 }
 867
 868 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
 869 {
 870         if (new_mtu != ETH_DATA_LEN)
 871                 return -EINVAL;
 872
 873         dev->mtu = new_mtu;
 874         return 0;
 875 }
 876
 877 static int vnet_set_mac_addr(struct net_device *dev, void *p)
 878 {
 879         return -EINVAL;
 880 }
 881
 882 static void vnet_get_drvinfo(struct net_device *dev,
 883                              struct ethtool_drvinfo *info)
 884 {
 885         strcpy(info->driver, DRV_MODULE_NAME);
 886         strcpy(info->version, DRV_MODULE_VERSION);
 887 }
 888
 889 static u32 vnet_get_msglevel(struct net_device *dev)
 890 {
 891         struct vnet *vp = netdev_priv(dev);
 892         return vp->msg_enable;
 893 }
 894
 895 static void vnet_set_msglevel(struct net_device *dev, u32 value)
 896 {
 897         struct vnet *vp = netdev_priv(dev);
 898         vp->msg_enable = value;
 899 }
 900
 901 static const struct ethtool_ops vnet_ethtool_ops = {
 902         .get_drvinfo            = vnet_get_drvinfo,
 903         .get_msglevel           = vnet_get_msglevel,
 904         .set_msglevel           = vnet_set_msglevel,
 905         .get_link               = ethtool_op_get_link,
 906 };
 907
 908 static void vnet_port_free_tx_bufs(struct vnet_port *port)
 909 {
 910         struct vio_dring_state *dr;
 911         int i;
 912
 913         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 914         if (dr->base) {
 915                 ldc_free_exp_dring(port->vio.lp, dr->base,
 916                                    (dr->entry_size * dr->num_entries),
 917                                    dr->cookies, dr->ncookies);
 918                 dr->base = NULL;
 919                 dr->entry_size = 0;
 920                 dr->num_entries = 0;
 921                 dr->pending = 0;
 922                 dr->ncookies = 0;
 923         }
 924
 925         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
 926                 void *buf = port->tx_bufs[i].buf;
 927
 928                 if (!buf)
 929                         continue;
 930
 931                 ldc_unmap(port->vio.lp,
 932                           port->tx_bufs[i].cookies,
 933                           port->tx_bufs[i].ncookies);
 934
 935                 kfree(buf);
 936                 port->tx_bufs[i].buf = NULL;
 937         }
 938 }
 939
 940 static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
 941 {
 942         struct vio_dring_state *dr;
 943         unsigned long len;
 944         int i, err, ncookies;
 945         void *dring;
 946
 947         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
 948                 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
 949                 int map_len = (ETH_FRAME_LEN + 7) & ~7;
 950
 951                 err = -ENOMEM;
 952                 if (!buf) {
 953                         pr_err("TX buffer allocation failure\n");
 954                         goto err_out;
 955                 }
 956                 err = -EFAULT;
 957                 if ((unsigned long)buf & (8UL - 1)) {
 958                         pr_err("TX buffer misaligned\n");
 959                         kfree(buf);
 960                         goto err_out;
 961                 }
 962
 963                 err = ldc_map_single(port->vio.lp, buf, map_len,
 964                                      port->tx_bufs[i].cookies, 2,
 965                                      (LDC_MAP_SHADOW |
 966                                       LDC_MAP_DIRECT |
 967                                       LDC_MAP_RW));
 968                 if (err < 0) {
 969                         kfree(buf);
 970                         goto err_out;
 971                 }
 972                 port->tx_bufs[i].buf = buf;
 973                 port->tx_bufs[i].ncookies = err;
 974         }
 975
 976         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 977
 978         len = (VNET_TX_RING_SIZE *
 979                (sizeof(struct vio_net_desc) +
 980                 (sizeof(struct ldc_trans_cookie) * 2)));
 981
 982         ncookies = VIO_MAX_RING_COOKIES;
 983         dring = ldc_alloc_exp_dring(port->vio.lp, len,
 984                                     dr->cookies, &ncookies,
 985                                     (LDC_MAP_SHADOW |
 986                                      LDC_MAP_DIRECT |
 987                                      LDC_MAP_RW));
 988         if (IS_ERR(dring)) {
 989                 err = PTR_ERR(dring);
 990                 goto err_out;
 991         }
 992
 993         dr->base = dring;
 994         dr->entry_size = (sizeof(struct vio_net_desc) +
 995                           (sizeof(struct ldc_trans_cookie) * 2));
 996         dr->num_entries = VNET_TX_RING_SIZE;
 997         dr->prod = dr->cons = 0;
 998         dr->pending = VNET_TX_RING_SIZE;
 999         dr->ncookies = ncookies;
1000
1001         return 0;
1002
1003 err_out:
1004         vnet_port_free_tx_bufs(port);
1005
1006         return err;
1007 }
1008
1009 static LIST_HEAD(vnet_list);
1010 static DEFINE_MUTEX(vnet_list_mutex);
1011
1012 static const struct net_device_ops vnet_ops = {
1013         .ndo_open               = vnet_open,
1014         .ndo_stop               = vnet_close,
1015         .ndo_set_rx_mode        = vnet_set_rx_mode,
1016         .ndo_set_mac_address    = vnet_set_mac_addr,
1017         .ndo_validate_addr      = eth_validate_addr,
1018         .ndo_tx_timeout         = vnet_tx_timeout,
1019         .ndo_change_mtu         = vnet_change_mtu,
1020         .ndo_start_xmit         = vnet_start_xmit,
1021 };
1022
1023 static struct vnet * __devinit vnet_new(const u64 *local_mac)
1024 {
1025         struct net_device *dev;
1026         struct vnet *vp;
1027         int err, i;
1028
1029         dev = alloc_etherdev(sizeof(*vp));
1030         if (!dev) {
1031                 pr_err("Etherdev alloc failed, aborting\n");
1032                 return ERR_PTR(-ENOMEM);
1033         }
1034
1035         for (i = 0; i < ETH_ALEN; i++)
1036                 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1037
1038         memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
1039
1040         vp = netdev_priv(dev);
1041
1042         spin_lock_init(&vp->lock);
1043         vp->dev = dev;
1044
1045         INIT_LIST_HEAD(&vp->port_list);
1046         for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1047                 INIT_HLIST_HEAD(&vp->port_hash[i]);
1048         INIT_LIST_HEAD(&vp->list);
1049         vp->local_mac = *local_mac;
1050
1051         dev->netdev_ops = &vnet_ops;
1052         dev->ethtool_ops = &vnet_ethtool_ops;
1053         dev->watchdog_timeo = VNET_TX_TIMEOUT;
1054
1055         err = register_netdev(dev);
1056         if (err) {
1057                 pr_err("Cannot register net device, aborting\n");
1058                 goto err_out_free_dev;
1059         }
1060
1061         netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1062
1063         list_add(&vp->list, &vnet_list);
1064
1065         return vp;
1066
1067 err_out_free_dev:
1068         free_netdev(dev);
1069
1070         return ERR_PTR(err);
1071 }
1072
1073 static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
1074 {
1075         struct vnet *iter, *vp;
1076
1077         mutex_lock(&vnet_list_mutex);
1078         vp = NULL;
1079         list_for_each_entry(iter, &vnet_list, list) {
1080                 if (iter->local_mac == *local_mac) {
1081                         vp = iter;
1082                         break;
1083                 }
1084         }
1085         if (!vp)
1086                 vp = vnet_new(local_mac);
1087         mutex_unlock(&vnet_list_mutex);
1088
1089         return vp;
1090 }
1091
1092 static const char *local_mac_prop = "local-mac-address";
1093
1094 static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
1095                                                 u64 port_node)
1096 {
1097         const u64 *local_mac = NULL;
1098         u64 a;
1099
1100         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1101                 u64 target = mdesc_arc_target(hp, a);
1102                 const char *name;
1103
1104                 name = mdesc_get_property(hp, target, "name", NULL);
1105                 if (!name || strcmp(name, "network"))
1106                         continue;
1107
1108                 local_mac = mdesc_get_property(hp, target,
1109                                                local_mac_prop, NULL);
1110                 if (local_mac)
1111                         break;
1112         }
1113         if (!local_mac)
1114                 return ERR_PTR(-ENODEV);
1115
1116         return vnet_find_or_create(local_mac);
1117 }
1118
1119 static struct ldc_channel_config vnet_ldc_cfg = {
1120         .event          = vnet_event,
1121         .mtu            = 64,
1122         .mode           = LDC_MODE_UNRELIABLE,
1123 };
1124
1125 static struct vio_driver_ops vnet_vio_ops = {
1126         .send_attr              = vnet_send_attr,
1127         .handle_attr            = vnet_handle_attr,
1128         .handshake_complete     = vnet_handshake_complete,
1129 };
1130
1131 static void __devinit print_version(void)
1132 {
1133         printk_once(KERN_INFO "%s", version);
1134 }
1135
1136 const char *remote_macaddr_prop = "remote-mac-address";
1137
1138 static int __devinit vnet_port_probe(struct vio_dev *vdev,
1139                                      const struct vio_device_id *id)
1140 {
1141         struct mdesc_handle *hp;
1142         struct vnet_port *port;
1143         unsigned long flags;
1144         struct vnet *vp;
1145         const u64 *rmac;
1146         int len, i, err, switch_port;
1147
1148         print_version();
1149
1150         hp = mdesc_grab();
1151
1152         vp = vnet_find_parent(hp, vdev->mp);
1153         if (IS_ERR(vp)) {
1154                 pr_err("Cannot find port parent vnet\n");
1155                 err = PTR_ERR(vp);
1156                 goto err_out_put_mdesc;
1157         }
1158
1159         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1160         err = -ENODEV;
1161         if (!rmac) {
1162                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1163                 goto err_out_put_mdesc;
1164         }
1165
1166         port = kzalloc(sizeof(*port), GFP_KERNEL);
1167         err = -ENOMEM;
1168         if (!port) {
1169                 pr_err("Cannot allocate vnet_port\n");
1170                 goto err_out_put_mdesc;
1171         }
1172
1173         for (i = 0; i < ETH_ALEN; i++)
1174                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1175
1176         port->vp = vp;
1177
1178         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1179                               vnet_versions, ARRAY_SIZE(vnet_versions),
1180                               &vnet_vio_ops, vp->dev->name);
1181         if (err)
1182                 goto err_out_free_port;
1183
1184         err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1185         if (err)
1186                 goto err_out_free_port;
1187
1188         err = vnet_port_alloc_tx_bufs(port);
1189         if (err)
1190                 goto err_out_free_ldc;
1191
1192         INIT_HLIST_NODE(&port->hash);
1193         INIT_LIST_HEAD(&port->list);
1194
1195         switch_port = 0;
1196         if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1197                 switch_port = 1;
1198         port->switch_port = switch_port;
1199
1200         spin_lock_irqsave(&vp->lock, flags);
1201         if (switch_port)
1202                 list_add(&port->list, &vp->port_list);
1203         else
1204                 list_add_tail(&port->list, &vp->port_list);
1205         hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
1206         spin_unlock_irqrestore(&vp->lock, flags);
1207
1208         dev_set_drvdata(&vdev->dev, port);
1209
1210         pr_info("%s: PORT ( remote-mac %pM%s )\n",
1211                 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1212
1213         vio_port_up(&port->vio);
1214
1215         mdesc_release(hp);
1216
1217         return 0;
1218
1219 err_out_free_ldc:
1220         vio_ldc_free(&port->vio);
1221
1222 err_out_free_port:
1223         kfree(port);
1224
1225 err_out_put_mdesc:
1226         mdesc_release(hp);
1227         return err;
1228 }
1229
1230 static int vnet_port_remove(struct vio_dev *vdev)
1231 {
1232         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
1233
1234         if (port) {
1235                 struct vnet *vp = port->vp;
1236                 unsigned long flags;
1237
1238                 del_timer_sync(&port->vio.timer);
1239
1240                 spin_lock_irqsave(&vp->lock, flags);
1241                 list_del(&port->list);
1242                 hlist_del(&port->hash);
1243                 spin_unlock_irqrestore(&vp->lock, flags);
1244
1245                 vnet_port_free_tx_bufs(port);
1246                 vio_ldc_free(&port->vio);
1247
1248                 dev_set_drvdata(&vdev->dev, NULL);
1249
1250                 kfree(port);
1251         }
1252         return 0;
1253 }
1254
1255 static const struct vio_device_id vnet_port_match[] = {
1256         {
1257                 .type = "vnet-port",
1258         },
1259         {},
1260 };
1261 MODULE_DEVICE_TABLE(vio, vnet_port_match);
1262
1263 static struct vio_driver vnet_port_driver = {
1264         .id_table       = vnet_port_match,
1265         .probe          = vnet_port_probe,
1266         .remove         = vnet_port_remove,
1267         .driver         = {
1268                 .name   = "vnet_port",
1269                 .owner  = THIS_MODULE,
1270         }
1271 };
1272
1273 static int __init vnet_init(void)
1274 {
1275         return vio_register_driver(&vnet_port_driver);
1276 }
1277
1278 static void __exit vnet_exit(void)
1279 {
1280         vio_unregister_driver(&vnet_port_driver);
1281 }
1282
1283 module_init(vnet_init);
1284 module_exit(vnet_exit);