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 #include <linux/highmem.h>
  19 #include <linux/if_vlan.h>
  20
  21 #if IS_ENABLED(CONFIG_IPV6)
  22 #include <linux/icmpv6.h>
  23 #endif
  24
  25 #include <net/ip.h>
  26 #include <net/icmp.h>
  27 #include <net/route.h>
  28
  29 #include <asm/vio.h>
  30 #include <asm/ldc.h>
  31
  32 #include "sunvnet.h"
  33
  34 #define DRV_MODULE_NAME         "sunvnet"
  35 #define DRV_MODULE_VERSION      "1.0"
  36 #define DRV_MODULE_RELDATE      "June 25, 2007"
  37
  38 static char version[] =
  39         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  40 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  41 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
  42 MODULE_LICENSE("GPL");
  43 MODULE_VERSION(DRV_MODULE_VERSION);
  44
  45 #define VNET_MAX_TXQS           16
  46
  47 /* Heuristic for the number of times to exponentially backoff and
  48  * retry sending an LDC trigger when EAGAIN is encountered
  49  */
  50 #define VNET_MAX_RETRIES        10
  51
  52 static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
  53 static void vnet_port_reset(struct vnet_port *port);
  54
  55 /* Ordered from largest major to lowest */
  56 static struct vio_version vnet_versions[] = {
  57         { .major = 1, .minor = 8 },
  58         { .major = 1, .minor = 7 },
  59         { .major = 1, .minor = 6 },
  60         { .major = 1, .minor = 0 },
  61 };
  62
  63 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
  64 {
  65         return vio_dring_avail(dr, VNET_TX_RING_SIZE);
  66 }
  67
  68 static int vnet_handle_unknown(struct vnet_port *port, void *arg)
  69 {
  70         struct vio_msg_tag *pkt = arg;
  71
  72         pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
  73                pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
  74         pr_err("Resetting connection\n");
  75
  76         ldc_disconnect(port->vio.lp);
  77
  78         return -ECONNRESET;
  79 }
  80
  81 static int vnet_port_alloc_tx_ring(struct vnet_port *port);
  82
  83 static int vnet_send_attr(struct vio_driver_state *vio)
  84 {
  85         struct vnet_port *port = to_vnet_port(vio);
  86         struct net_device *dev = port->vp->dev;
  87         struct vio_net_attr_info pkt;
  88         int framelen = ETH_FRAME_LEN;
  89         int i, err;
  90
  91         err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
  92         if (err)
  93                 return err;
  94
  95         memset(&pkt, 0, sizeof(pkt));
  96         pkt.tag.type = VIO_TYPE_CTRL;
  97         pkt.tag.stype = VIO_SUBTYPE_INFO;
  98         pkt.tag.stype_env = VIO_ATTR_INFO;
  99         pkt.tag.sid = vio_send_sid(vio);
 100         if (vio_version_before(vio, 1, 2))
 101                 pkt.xfer_mode = VIO_DRING_MODE;
 102         else
 103                 pkt.xfer_mode = VIO_NEW_DRING_MODE;
 104         pkt.addr_type = VNET_ADDR_ETHERMAC;
 105         pkt.ack_freq = 0;
 106         for (i = 0; i < 6; i++)
 107                 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
 108         if (vio_version_after(vio, 1, 3)) {
 109                 if (port->rmtu) {
 110                         port->rmtu = min(VNET_MAXPACKET, port->rmtu);
 111                         pkt.mtu = port->rmtu;
 112                 } else {
 113                         port->rmtu = VNET_MAXPACKET;
 114                         pkt.mtu = port->rmtu;
 115                 }
 116                 if (vio_version_after_eq(vio, 1, 6))
 117                         pkt.options = VIO_TX_DRING;
 118         } else if (vio_version_before(vio, 1, 3)) {
 119                 pkt.mtu = framelen;
 120         } else { /* v1.3 */
 121                 pkt.mtu = framelen + VLAN_HLEN;
 122         }
 123
 124         pkt.cflags = 0;
 125         if (vio_version_after_eq(vio, 1, 7) && port->tso) {
 126                 pkt.cflags |= VNET_LSO_IPV4_CAPAB;
 127                 if (!port->tsolen)
 128                         port->tsolen = VNET_MAXTSO;
 129                 pkt.ipv4_lso_maxlen = port->tsolen;
 130         }
 131
 132         pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
 133
 134         viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
 135                "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
 136                "cflags[0x%04x] lso_max[%u]\n",
 137                pkt.xfer_mode, pkt.addr_type,
 138                (unsigned long long)pkt.addr,
 139                pkt.ack_freq, pkt.plnk_updt, pkt.options,
 140                (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
 141
 142
 143         return vio_ldc_send(vio, &pkt, sizeof(pkt));
 144 }
 145
 146 static int handle_attr_info(struct vio_driver_state *vio,
 147                             struct vio_net_attr_info *pkt)
 148 {
 149         struct vnet_port *port = to_vnet_port(vio);
 150         u64     localmtu;
 151         u8      xfer_mode;
 152
 153         viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
 154                "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
 155                " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
 156                pkt->xfer_mode, pkt->addr_type,
 157                (unsigned long long)pkt->addr,
 158                pkt->ack_freq, pkt->plnk_updt, pkt->options,
 159                (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
 160                pkt->ipv4_lso_maxlen);
 161
 162         pkt->tag.sid = vio_send_sid(vio);
 163
 164         xfer_mode = pkt->xfer_mode;
 165         /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
 166         if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
 167                 xfer_mode = VIO_NEW_DRING_MODE;
 168
 169         /* MTU negotiation:
 170          *      < v1.3 - ETH_FRAME_LEN exactly
 171          *      > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
 172          *                      pkt->mtu for ACK
 173          *      = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
 174          */
 175         if (vio_version_before(vio, 1, 3)) {
 176                 localmtu = ETH_FRAME_LEN;
 177         } else if (vio_version_after(vio, 1, 3)) {
 178                 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
 179                 localmtu = min(pkt->mtu, localmtu);
 180                 pkt->mtu = localmtu;
 181         } else { /* v1.3 */
 182                 localmtu = ETH_FRAME_LEN + VLAN_HLEN;
 183         }
 184         port->rmtu = localmtu;
 185
 186         /* LSO negotiation */
 187         if (vio_version_after_eq(vio, 1, 7))
 188                 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
 189         else
 190                 port->tso = false;
 191         if (port->tso) {
 192                 if (!port->tsolen)
 193                         port->tsolen = VNET_MAXTSO;
 194                 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
 195                 if (port->tsolen < VNET_MINTSO) {
 196                         port->tso = false;
 197                         port->tsolen = 0;
 198                         pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
 199                 }
 200                 pkt->ipv4_lso_maxlen = port->tsolen;
 201         } else {
 202                 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
 203                 pkt->ipv4_lso_maxlen = 0;
 204         }
 205
 206         /* for version >= 1.6, ACK packet mode we support */
 207         if (vio_version_after_eq(vio, 1, 6)) {
 208                 pkt->xfer_mode = VIO_NEW_DRING_MODE;
 209                 pkt->options = VIO_TX_DRING;
 210         }
 211
 212         if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
 213             pkt->addr_type != VNET_ADDR_ETHERMAC ||
 214             pkt->mtu != localmtu) {
 215                 viodbg(HS, "SEND NET ATTR NACK\n");
 216
 217                 pkt->tag.stype = VIO_SUBTYPE_NACK;
 218
 219                 (void) vio_ldc_send(vio, pkt, sizeof(*pkt));
 220
 221                 return -ECONNRESET;
 222         } else {
 223                 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
 224                        "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
 225                        "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
 226                        pkt->xfer_mode, pkt->addr_type,
 227                        (unsigned long long)pkt->addr,
 228                        pkt->ack_freq, pkt->plnk_updt, pkt->options,
 229                        (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
 230                        pkt->ipv4_lso_maxlen);
 231
 232                 pkt->tag.stype = VIO_SUBTYPE_ACK;
 233
 234                 return vio_ldc_send(vio, pkt, sizeof(*pkt));
 235         }
 236
 237 }
 238
 239 static int handle_attr_ack(struct vio_driver_state *vio,
 240                            struct vio_net_attr_info *pkt)
 241 {
 242         viodbg(HS, "GOT NET ATTR ACK\n");
 243
 244         return 0;
 245 }
 246
 247 static int handle_attr_nack(struct vio_driver_state *vio,
 248                             struct vio_net_attr_info *pkt)
 249 {
 250         viodbg(HS, "GOT NET ATTR NACK\n");
 251
 252         return -ECONNRESET;
 253 }
 254
 255 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
 256 {
 257         struct vio_net_attr_info *pkt = arg;
 258
 259         switch (pkt->tag.stype) {
 260         case VIO_SUBTYPE_INFO:
 261                 return handle_attr_info(vio, pkt);
 262
 263         case VIO_SUBTYPE_ACK:
 264                 return handle_attr_ack(vio, pkt);
 265
 266         case VIO_SUBTYPE_NACK:
 267                 return handle_attr_nack(vio, pkt);
 268
 269         default:
 270                 return -ECONNRESET;
 271         }
 272 }
 273
 274 static void vnet_handshake_complete(struct vio_driver_state *vio)
 275 {
 276         struct vio_dring_state *dr;
 277
 278         dr = &vio->drings[VIO_DRIVER_RX_RING];
 279         dr->snd_nxt = dr->rcv_nxt = 1;
 280
 281         dr = &vio->drings[VIO_DRIVER_TX_RING];
 282         dr->snd_nxt = dr->rcv_nxt = 1;
 283 }
 284
 285 /* The hypervisor interface that implements copying to/from imported
 286  * memory from another domain requires that copies are done to 8-byte
 287  * aligned buffers, and that the lengths of such copies are also 8-byte
 288  * multiples.
 289  *
 290  * So we align skb->data to an 8-byte multiple and pad-out the data
 291  * area so we can round the copy length up to the next multiple of
 292  * 8 for the copy.
 293  *
 294  * The transmitter puts the actual start of the packet 6 bytes into
 295  * the buffer it sends over, so that the IP headers after the ethernet
 296  * header are aligned properly.  These 6 bytes are not in the descriptor
 297  * length, they are simply implied.  This offset is represented using
 298  * the VNET_PACKET_SKIP macro.
 299  */
 300 static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
 301                                            unsigned int len)
 302 {
 303         struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
 304         unsigned long addr, off;
 305
 306         if (unlikely(!skb))
 307                 return NULL;
 308
 309         addr = (unsigned long) skb->data;
 310         off = ((addr + 7UL) & ~7UL) - addr;
 311         if (off)
 312                 skb_reserve(skb, off);
 313
 314         return skb;
 315 }
 316
 317 static inline void vnet_fullcsum(struct sk_buff *skb)
 318 {
 319         struct iphdr *iph = ip_hdr(skb);
 320         int offset = skb_transport_offset(skb);
 321
 322         if (skb->protocol != htons(ETH_P_IP))
 323                 return;
 324         if (iph->protocol != IPPROTO_TCP &&
 325             iph->protocol != IPPROTO_UDP)
 326                 return;
 327         skb->ip_summed = CHECKSUM_NONE;
 328         skb->csum_level = 1;
 329         skb->csum = 0;
 330         if (iph->protocol == IPPROTO_TCP) {
 331                 struct tcphdr *ptcp = tcp_hdr(skb);
 332
 333                 ptcp->check = 0;
 334                 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
 335                 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
 336                                                 skb->len - offset, IPPROTO_TCP,
 337                                                 skb->csum);
 338         } else if (iph->protocol == IPPROTO_UDP) {
 339                 struct udphdr *pudp = udp_hdr(skb);
 340
 341                 pudp->check = 0;
 342                 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
 343                 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
 344                                                 skb->len - offset, IPPROTO_UDP,
 345                                                 skb->csum);
 346         }
 347 }
 348
 349 static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
 350 {
 351         struct net_device *dev = port->vp->dev;
 352         unsigned int len = desc->size;
 353         unsigned int copy_len;
 354         struct sk_buff *skb;
 355         int maxlen;
 356         int err;
 357
 358         err = -EMSGSIZE;
 359         if (port->tso && port->tsolen > port->rmtu)
 360                 maxlen = port->tsolen;
 361         else
 362                 maxlen = port->rmtu;
 363         if (unlikely(len < ETH_ZLEN || len > maxlen)) {
 364                 dev->stats.rx_length_errors++;
 365                 goto out_dropped;
 366         }
 367
 368         skb = alloc_and_align_skb(dev, len);
 369         err = -ENOMEM;
 370         if (unlikely(!skb)) {
 371                 dev->stats.rx_missed_errors++;
 372                 goto out_dropped;
 373         }
 374
 375         copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
 376         skb_put(skb, copy_len);
 377         err = ldc_copy(port->vio.lp, LDC_COPY_IN,
 378                        skb->data, copy_len, 0,
 379                        desc->cookies, desc->ncookies);
 380         if (unlikely(err < 0)) {
 381                 dev->stats.rx_frame_errors++;
 382                 goto out_free_skb;
 383         }
 384
 385         skb_pull(skb, VNET_PACKET_SKIP);
 386         skb_trim(skb, len);
 387         skb->protocol = eth_type_trans(skb, dev);
 388
 389         if (vio_version_after_eq(&port->vio, 1, 8)) {
 390                 struct vio_net_dext *dext = vio_net_ext(desc);
 391
 392                 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
 393                         if (skb->protocol == ETH_P_IP) {
 394                                 struct iphdr *iph = (struct iphdr *)skb->data;
 395
 396                                 iph->check = 0;
 397                                 ip_send_check(iph);
 398                         }
 399                 }
 400                 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
 401                     skb->ip_summed == CHECKSUM_NONE)
 402                         vnet_fullcsum(skb);
 403                 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
 404                         skb->ip_summed = CHECKSUM_PARTIAL;
 405                         skb->csum_level = 0;
 406                         if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
 407                                 skb->csum_level = 1;
 408                 }
 409         }
 410
 411         skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
 412
 413         dev->stats.rx_packets++;
 414         dev->stats.rx_bytes += len;
 415         napi_gro_receive(&port->napi, skb);
 416         return 0;
 417
 418 out_free_skb:
 419         kfree_skb(skb);
 420
 421 out_dropped:
 422         dev->stats.rx_dropped++;
 423         return err;
 424 }
 425
 426 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
 427                          u32 start, u32 end, u8 vio_dring_state)
 428 {
 429         struct vio_dring_data hdr = {
 430                 .tag = {
 431                         .type           = VIO_TYPE_DATA,
 432                         .stype          = VIO_SUBTYPE_ACK,
 433                         .stype_env      = VIO_DRING_DATA,
 434                         .sid            = vio_send_sid(&port->vio),
 435                 },
 436                 .dring_ident            = dr->ident,
 437                 .start_idx              = start,
 438                 .end_idx                = end,
 439                 .state                  = vio_dring_state,
 440         };
 441         int err, delay;
 442         int retries = 0;
 443
 444         hdr.seq = dr->snd_nxt;
 445         delay = 1;
 446         do {
 447                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
 448                 if (err > 0) {
 449                         dr->snd_nxt++;
 450                         break;
 451                 }
 452                 udelay(delay);
 453                 if ((delay <<= 1) > 128)
 454                         delay = 128;
 455                 if (retries++ > VNET_MAX_RETRIES) {
 456                         pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
 457                                 port->raddr[0], port->raddr[1],
 458                                 port->raddr[2], port->raddr[3],
 459                                 port->raddr[4], port->raddr[5]);
 460                         break;
 461                 }
 462         } while (err == -EAGAIN);
 463
 464         if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
 465                 port->stop_rx_idx = end;
 466                 port->stop_rx = true;
 467         } else {
 468                 port->stop_rx_idx = 0;
 469                 port->stop_rx = false;
 470         }
 471
 472         return err;
 473 }
 474
 475 static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
 476                                         struct vio_dring_state *dr,
 477                                         u32 index)
 478 {
 479         struct vio_net_desc *desc = port->vio.desc_buf;
 480         int err;
 481
 482         err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
 483                                   (index * dr->entry_size),
 484                                   dr->cookies, dr->ncookies);
 485         if (err < 0)
 486                 return ERR_PTR(err);
 487
 488         return desc;
 489 }
 490
 491 static int put_rx_desc(struct vnet_port *port,
 492                        struct vio_dring_state *dr,
 493                        struct vio_net_desc *desc,
 494                        u32 index)
 495 {
 496         int err;
 497
 498         err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
 499                                   (index * dr->entry_size),
 500                                   dr->cookies, dr->ncookies);
 501         if (err < 0)
 502                 return err;
 503
 504         return 0;
 505 }
 506
 507 static int vnet_walk_rx_one(struct vnet_port *port,
 508                             struct vio_dring_state *dr,
 509                             u32 index, int *needs_ack)
 510 {
 511         struct vio_net_desc *desc = get_rx_desc(port, dr, index);
 512         struct vio_driver_state *vio = &port->vio;
 513         int err;
 514
 515         BUG_ON(desc == NULL);
 516         if (IS_ERR(desc))
 517                 return PTR_ERR(desc);
 518
 519         if (desc->hdr.state != VIO_DESC_READY)
 520                 return 1;
 521
 522         dma_rmb();
 523
 524         viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
 525                desc->hdr.state, desc->hdr.ack,
 526                desc->size, desc->ncookies,
 527                desc->cookies[0].cookie_addr,
 528                desc->cookies[0].cookie_size);
 529
 530         err = vnet_rx_one(port, desc);
 531         if (err == -ECONNRESET)
 532                 return err;
 533         desc->hdr.state = VIO_DESC_DONE;
 534         err = put_rx_desc(port, dr, desc, index);
 535         if (err < 0)
 536                 return err;
 537         *needs_ack = desc->hdr.ack;
 538         return 0;
 539 }
 540
 541 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
 542                         u32 start, u32 end, int *npkts, int budget)
 543 {
 544         struct vio_driver_state *vio = &port->vio;
 545         int ack_start = -1, ack_end = -1;
 546         bool send_ack = true;
 547
 548         end = (end == (u32) -1) ? vio_dring_prev(dr, start)
 549                                 : vio_dring_next(dr, end);
 550
 551         viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
 552
 553         while (start != end) {
 554                 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
 555                 if (err == -ECONNRESET)
 556                         return err;
 557                 if (err != 0)
 558                         break;
 559                 (*npkts)++;
 560                 if (ack_start == -1)
 561                         ack_start = start;
 562                 ack_end = start;
 563                 start = vio_dring_next(dr, start);
 564                 if (ack && start != end) {
 565                         err = vnet_send_ack(port, dr, ack_start, ack_end,
 566                                             VIO_DRING_ACTIVE);
 567                         if (err == -ECONNRESET)
 568                                 return err;
 569                         ack_start = -1;
 570                 }
 571                 if ((*npkts) >= budget) {
 572                         send_ack = false;
 573                         break;
 574                 }
 575         }
 576         if (unlikely(ack_start == -1))
 577                 ack_start = ack_end = vio_dring_prev(dr, start);
 578         if (send_ack) {
 579                 port->napi_resume = false;
 580                 return vnet_send_ack(port, dr, ack_start, ack_end,
 581                                      VIO_DRING_STOPPED);
 582         } else  {
 583                 port->napi_resume = true;
 584                 port->napi_stop_idx = ack_end;
 585                 return 1;
 586         }
 587 }
 588
 589 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
 590                    int budget)
 591 {
 592         struct vio_dring_data *pkt = msgbuf;
 593         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
 594         struct vio_driver_state *vio = &port->vio;
 595
 596         viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
 597                pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
 598
 599         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
 600                 return 0;
 601         if (unlikely(pkt->seq != dr->rcv_nxt)) {
 602                 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
 603                        pkt->seq, dr->rcv_nxt);
 604                 return 0;
 605         }
 606
 607         if (!port->napi_resume)
 608                 dr->rcv_nxt++;
 609
 610         /* XXX Validate pkt->start_idx and pkt->end_idx XXX */
 611
 612         return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
 613                             npkts, budget);
 614 }
 615
 616 static int idx_is_pending(struct vio_dring_state *dr, u32 end)
 617 {
 618         u32 idx = dr->cons;
 619         int found = 0;
 620
 621         while (idx != dr->prod) {
 622                 if (idx == end) {
 623                         found = 1;
 624                         break;
 625                 }
 626                 idx = vio_dring_next(dr, idx);
 627         }
 628         return found;
 629 }
 630
 631 static int vnet_ack(struct vnet_port *port, void *msgbuf)
 632 {
 633         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 634         struct vio_dring_data *pkt = msgbuf;
 635         struct net_device *dev;
 636         struct vnet *vp;
 637         u32 end;
 638         struct vio_net_desc *desc;
 639         struct netdev_queue *txq;
 640
 641         if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
 642                 return 0;
 643
 644         end = pkt->end_idx;
 645         vp = port->vp;
 646         dev = vp->dev;
 647         netif_tx_lock(dev);
 648         if (unlikely(!idx_is_pending(dr, end))) {
 649                 netif_tx_unlock(dev);
 650                 return 0;
 651         }
 652
 653         /* sync for race conditions with vnet_start_xmit() and tell xmit it
 654          * is time to send a trigger.
 655          */
 656         dr->cons = vio_dring_next(dr, end);
 657         desc = vio_dring_entry(dr, dr->cons);
 658         if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
 659                 /* vnet_start_xmit() just populated this dring but missed
 660                  * sending the "start" LDC message to the consumer.
 661                  * Send a "start" trigger on its behalf.
 662                  */
 663                 if (__vnet_tx_trigger(port, dr->cons) > 0)
 664                         port->start_cons = false;
 665                 else
 666                         port->start_cons = true;
 667         } else {
 668                 port->start_cons = true;
 669         }
 670         netif_tx_unlock(dev);
 671
 672         txq = netdev_get_tx_queue(dev, port->q_index);
 673         if (unlikely(netif_tx_queue_stopped(txq) &&
 674                      vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
 675                 return 1;
 676
 677         return 0;
 678 }
 679
 680 static int vnet_nack(struct vnet_port *port, void *msgbuf)
 681 {
 682         /* XXX just reset or similar XXX */
 683         return 0;
 684 }
 685
 686 static int handle_mcast(struct vnet_port *port, void *msgbuf)
 687 {
 688         struct vio_net_mcast_info *pkt = msgbuf;
 689
 690         if (pkt->tag.stype != VIO_SUBTYPE_ACK)
 691                 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
 692                        port->vp->dev->name,
 693                        pkt->tag.type,
 694                        pkt->tag.stype,
 695                        pkt->tag.stype_env,
 696                        pkt->tag.sid);
 697
 698         return 0;
 699 }
 700
 701 /* Got back a STOPPED LDC message on port. If the queue is stopped,
 702  * wake it up so that we'll send out another START message at the
 703  * next TX.
 704  */
 705 static void maybe_tx_wakeup(struct vnet_port *port)
 706 {
 707         struct netdev_queue *txq;
 708
 709         txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
 710         __netif_tx_lock(txq, smp_processor_id());
 711         if (likely(netif_tx_queue_stopped(txq))) {
 712                 struct vio_dring_state *dr;
 713
 714                 dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 715                 netif_tx_wake_queue(txq);
 716         }
 717         __netif_tx_unlock(txq);
 718 }
 719
 720 static inline bool port_is_up(struct vnet_port *vnet)
 721 {
 722         struct vio_driver_state *vio = &vnet->vio;
 723
 724         return !!(vio->hs_state & VIO_HS_COMPLETE);
 725 }
 726
 727 static int vnet_event_napi(struct vnet_port *port, int budget)
 728 {
 729         struct vio_driver_state *vio = &port->vio;
 730         int tx_wakeup, err;
 731         int npkts = 0;
 732         int event = (port->rx_event & LDC_EVENT_RESET);
 733
 734 ldc_ctrl:
 735         if (unlikely(event == LDC_EVENT_RESET ||
 736                      event == LDC_EVENT_UP)) {
 737                 vio_link_state_change(vio, event);
 738
 739                 if (event == LDC_EVENT_RESET) {
 740                         vnet_port_reset(port);
 741                         vio_port_up(vio);
 742                 }
 743                 port->rx_event = 0;
 744                 return 0;
 745         }
 746         /* We may have multiple LDC events in rx_event. Unroll send_events() */
 747         event = (port->rx_event & LDC_EVENT_UP);
 748         port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
 749         if (event == LDC_EVENT_UP)
 750                 goto ldc_ctrl;
 751         event = port->rx_event;
 752         if (!(event & LDC_EVENT_DATA_READY))
 753                 return 0;
 754
 755         /* we dont expect any other bits than RESET, UP, DATA_READY */
 756         BUG_ON(event != LDC_EVENT_DATA_READY);
 757
 758         tx_wakeup = err = 0;
 759         while (1) {
 760                 union {
 761                         struct vio_msg_tag tag;
 762                         u64 raw[8];
 763                 } msgbuf;
 764
 765                 if (port->napi_resume) {
 766                         struct vio_dring_data *pkt =
 767                                 (struct vio_dring_data *)&msgbuf;
 768                         struct vio_dring_state *dr =
 769                                 &port->vio.drings[VIO_DRIVER_RX_RING];
 770
 771                         pkt->tag.type = VIO_TYPE_DATA;
 772                         pkt->tag.stype = VIO_SUBTYPE_INFO;
 773                         pkt->tag.stype_env = VIO_DRING_DATA;
 774                         pkt->seq = dr->rcv_nxt;
 775                         pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
 776                         pkt->end_idx = -1;
 777                         goto napi_resume;
 778                 }
 779                 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
 780                 if (unlikely(err < 0)) {
 781                         if (err == -ECONNRESET)
 782                                 vio_conn_reset(vio);
 783                         break;
 784                 }
 785                 if (err == 0)
 786                         break;
 787                 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
 788                        msgbuf.tag.type,
 789                        msgbuf.tag.stype,
 790                        msgbuf.tag.stype_env,
 791                        msgbuf.tag.sid);
 792                 err = vio_validate_sid(vio, &msgbuf.tag);
 793                 if (err < 0)
 794                         break;
 795 napi_resume:
 796                 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
 797                         if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
 798                                 if (!port_is_up(port)) {
 799                                         /* failures like handshake_failure()
 800                                          * may have cleaned up dring, but
 801                                          * NAPI polling may bring us here.
 802                                          */
 803                                         err = -ECONNRESET;
 804                                         break;
 805                                 }
 806                                 err = vnet_rx(port, &msgbuf, &npkts, budget);
 807                                 if (npkts >= budget)
 808                                         break;
 809                                 if (npkts == 0)
 810                                         break;
 811                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
 812                                 err = vnet_ack(port, &msgbuf);
 813                                 if (err > 0)
 814                                         tx_wakeup |= err;
 815                         } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
 816                                 err = vnet_nack(port, &msgbuf);
 817                         }
 818                 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
 819                         if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
 820                                 err = handle_mcast(port, &msgbuf);
 821                         else
 822                                 err = vio_control_pkt_engine(vio, &msgbuf);
 823                         if (err)
 824                                 break;
 825                 } else {
 826                         err = vnet_handle_unknown(port, &msgbuf);
 827                 }
 828                 if (err == -ECONNRESET)
 829                         break;
 830         }
 831         if (unlikely(tx_wakeup && err != -ECONNRESET))
 832                 maybe_tx_wakeup(port);
 833         return npkts;
 834 }
 835
 836 static int vnet_poll(struct napi_struct *napi, int budget)
 837 {
 838         struct vnet_port *port = container_of(napi, struct vnet_port, napi);
 839         struct vio_driver_state *vio = &port->vio;
 840         int processed = vnet_event_napi(port, budget);
 841
 842         if (processed < budget) {
 843                 napi_complete(napi);
 844                 port->rx_event &= ~LDC_EVENT_DATA_READY;
 845                 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
 846         }
 847         return processed;
 848 }
 849
 850 static void vnet_event(void *arg, int event)
 851 {
 852         struct vnet_port *port = arg;
 853         struct vio_driver_state *vio = &port->vio;
 854
 855         port->rx_event |= event;
 856         vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
 857         napi_schedule(&port->napi);
 858
 859 }
 860
 861 static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
 862 {
 863         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 864         struct vio_dring_data hdr = {
 865                 .tag = {
 866                         .type           = VIO_TYPE_DATA,
 867                         .stype          = VIO_SUBTYPE_INFO,
 868                         .stype_env      = VIO_DRING_DATA,
 869                         .sid            = vio_send_sid(&port->vio),
 870                 },
 871                 .dring_ident            = dr->ident,
 872                 .start_idx              = start,
 873                 .end_idx                = (u32) -1,
 874         };
 875         int err, delay;
 876         int retries = 0;
 877
 878         if (port->stop_rx) {
 879                 err = vnet_send_ack(port,
 880                                     &port->vio.drings[VIO_DRIVER_RX_RING],
 881                                     port->stop_rx_idx, -1,
 882                                     VIO_DRING_STOPPED);
 883                 if (err <= 0)
 884                         return err;
 885         }
 886
 887         hdr.seq = dr->snd_nxt;
 888         delay = 1;
 889         do {
 890                 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
 891                 if (err > 0) {
 892                         dr->snd_nxt++;
 893                         break;
 894                 }
 895                 udelay(delay);
 896                 if ((delay <<= 1) > 128)
 897                         delay = 128;
 898                 if (retries++ > VNET_MAX_RETRIES)
 899                         break;
 900         } while (err == -EAGAIN);
 901
 902         return err;
 903 }
 904
 905 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
 906 {
 907         unsigned int hash = vnet_hashfn(skb->data);
 908         struct hlist_head *hp = &vp->port_hash[hash];
 909         struct vnet_port *port;
 910
 911         hlist_for_each_entry_rcu(port, hp, hash) {
 912                 if (!port_is_up(port))
 913                         continue;
 914                 if (ether_addr_equal(port->raddr, skb->data))
 915                         return port;
 916         }
 917         list_for_each_entry_rcu(port, &vp->port_list, list) {
 918                 if (!port->switch_port)
 919                         continue;
 920                 if (!port_is_up(port))
 921                         continue;
 922                 return port;
 923         }
 924         return NULL;
 925 }
 926
 927 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
 928                                           unsigned *pending)
 929 {
 930         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
 931         struct sk_buff *skb = NULL;
 932         int i, txi;
 933
 934         *pending = 0;
 935
 936         txi = dr->prod;
 937         for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
 938                 struct vio_net_desc *d;
 939
 940                 --txi;
 941                 if (txi < 0)
 942                         txi = VNET_TX_RING_SIZE-1;
 943
 944                 d = vio_dring_entry(dr, txi);
 945
 946                 if (d->hdr.state == VIO_DESC_READY) {
 947                         (*pending)++;
 948                         continue;
 949                 }
 950                 if (port->tx_bufs[txi].skb) {
 951                         if (d->hdr.state != VIO_DESC_DONE)
 952                                 pr_notice("invalid ring buffer state %d\n",
 953                                           d->hdr.state);
 954                         BUG_ON(port->tx_bufs[txi].skb->next);
 955
 956                         port->tx_bufs[txi].skb->next = skb;
 957                         skb = port->tx_bufs[txi].skb;
 958                         port->tx_bufs[txi].skb = NULL;
 959
 960                         ldc_unmap(port->vio.lp,
 961                                   port->tx_bufs[txi].cookies,
 962                                   port->tx_bufs[txi].ncookies);
 963                 } else if (d->hdr.state == VIO_DESC_FREE)
 964                         break;
 965                 d->hdr.state = VIO_DESC_FREE;
 966         }
 967         return skb;
 968 }
 969
 970 static inline void vnet_free_skbs(struct sk_buff *skb)
 971 {
 972         struct sk_buff *next;
 973
 974         while (skb) {
 975                 next = skb->next;
 976                 skb->next = NULL;
 977                 dev_kfree_skb(skb);
 978                 skb = next;
 979         }
 980 }
 981
 982 static void vnet_clean_timer_expire(unsigned long port0)
 983 {
 984         struct vnet_port *port = (struct vnet_port *)port0;
 985         struct sk_buff *freeskbs;
 986         unsigned pending;
 987
 988         netif_tx_lock(port->vp->dev);
 989         freeskbs = vnet_clean_tx_ring(port, &pending);
 990         netif_tx_unlock(port->vp->dev);
 991
 992         vnet_free_skbs(freeskbs);
 993
 994         if (pending)
 995                 (void)mod_timer(&port->clean_timer,
 996                                 jiffies + VNET_CLEAN_TIMEOUT);
 997          else
 998                 del_timer(&port->clean_timer);
 999 }
1000
1001 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
1002                                struct ldc_trans_cookie *cookies, int ncookies,
1003                                unsigned int map_perm)
1004 {
1005         int i, nc, err, blen;
1006
1007         /* header */
1008         blen = skb_headlen(skb);
1009         if (blen < ETH_ZLEN)
1010                 blen = ETH_ZLEN;
1011         blen += VNET_PACKET_SKIP;
1012         blen += 8 - (blen & 7);
1013
1014         err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
1015                              ncookies, map_perm);
1016         if (err < 0)
1017                 return err;
1018         nc = err;
1019
1020         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1021                 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1022                 u8 *vaddr;
1023
1024                 if (nc < ncookies) {
1025                         vaddr = kmap_atomic(skb_frag_page(f));
1026                         blen = skb_frag_size(f);
1027                         blen += 8 - (blen & 7);
1028                         err = ldc_map_single(lp, vaddr + f->page_offset,
1029                                              blen, cookies + nc, ncookies - nc,
1030                                              map_perm);
1031                         kunmap_atomic(vaddr);
1032                 } else {
1033                         err = -EMSGSIZE;
1034                 }
1035
1036                 if (err < 0) {
1037                         ldc_unmap(lp, cookies, nc);
1038                         return err;
1039                 }
1040                 nc += err;
1041         }
1042         return nc;
1043 }
1044
1045 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
1046 {
1047         struct sk_buff *nskb;
1048         int i, len, pad, docopy;
1049
1050         len = skb->len;
1051         pad = 0;
1052         if (len < ETH_ZLEN) {
1053                 pad += ETH_ZLEN - skb->len;
1054                 len += pad;
1055         }
1056         len += VNET_PACKET_SKIP;
1057         pad += 8 - (len & 7);
1058
1059         /* make sure we have enough cookies and alignment in every frag */
1060         docopy = skb_shinfo(skb)->nr_frags >= ncookies;
1061         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1062                 skb_frag_t *f = &skb_shinfo(skb)->frags[i];
1063
1064                 docopy |= f->page_offset & 7;
1065         }
1066         if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
1067             skb_tailroom(skb) < pad ||
1068             skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
1069                 int start = 0, offset;
1070                 __wsum csum;
1071
1072                 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
1073                 nskb = alloc_and_align_skb(skb->dev, len);
1074                 if (nskb == NULL) {
1075                         dev_kfree_skb(skb);
1076                         return NULL;
1077                 }
1078                 skb_reserve(nskb, VNET_PACKET_SKIP);
1079
1080                 nskb->protocol = skb->protocol;
1081                 offset = skb_mac_header(skb) - skb->data;
1082                 skb_set_mac_header(nskb, offset);
1083                 offset = skb_network_header(skb) - skb->data;
1084                 skb_set_network_header(nskb, offset);
1085                 offset = skb_transport_header(skb) - skb->data;
1086                 skb_set_transport_header(nskb, offset);
1087
1088                 offset = 0;
1089                 nskb->csum_offset = skb->csum_offset;
1090                 nskb->ip_summed = skb->ip_summed;
1091
1092                 if (skb->ip_summed == CHECKSUM_PARTIAL)
1093                         start = skb_checksum_start_offset(skb);
1094                 if (start) {
1095                         struct iphdr *iph = ip_hdr(nskb);
1096                         int offset = start + nskb->csum_offset;
1097
1098                         if (skb_copy_bits(skb, 0, nskb->data, start)) {
1099                                 dev_kfree_skb(nskb);
1100                                 dev_kfree_skb(skb);
1101                                 return NULL;
1102                         }
1103                         *(__sum16 *)(skb->data + offset) = 0;
1104                         csum = skb_copy_and_csum_bits(skb, start,
1105                                                       nskb->data + start,
1106                                                       skb->len - start, 0);
1107                         if (iph->protocol == IPPROTO_TCP ||
1108                             iph->protocol == IPPROTO_UDP) {
1109                                 csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
1110                                                          skb->len - start,
1111                                                          iph->protocol, csum);
1112                         }
1113                         *(__sum16 *)(nskb->data + offset) = csum;
1114
1115                         nskb->ip_summed = CHECKSUM_NONE;
1116                 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
1117                         dev_kfree_skb(nskb);
1118                         dev_kfree_skb(skb);
1119                         return NULL;
1120                 }
1121                 (void)skb_put(nskb, skb->len);
1122                 if (skb_is_gso(skb)) {
1123                         skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
1124                         skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
1125                 }
1126                 nskb->queue_mapping = skb->queue_mapping;
1127                 dev_kfree_skb(skb);
1128                 skb = nskb;
1129         }
1130         return skb;
1131 }
1132
1133 static u16
1134 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
1135                   void *accel_priv, select_queue_fallback_t fallback)
1136 {
1137         struct vnet *vp = netdev_priv(dev);
1138         struct vnet_port *port = __tx_port_find(vp, skb);
1139
1140         if (port == NULL)
1141                 return 0;
1142         return port->q_index;
1143 }
1144
1145 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
1146
1147 static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
1148 {
1149         struct net_device *dev = port->vp->dev;
1150         struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1151         struct sk_buff *segs;
1152         int maclen, datalen;
1153         int status;
1154         int gso_size, gso_type, gso_segs;
1155         int hlen = skb_transport_header(skb) - skb_mac_header(skb);
1156         int proto = IPPROTO_IP;
1157
1158         if (skb->protocol == htons(ETH_P_IP))
1159                 proto = ip_hdr(skb)->protocol;
1160         else if (skb->protocol == htons(ETH_P_IPV6))
1161                 proto = ipv6_hdr(skb)->nexthdr;
1162
1163         if (proto == IPPROTO_TCP)
1164                 hlen += tcp_hdr(skb)->doff * 4;
1165         else if (proto == IPPROTO_UDP)
1166                 hlen += sizeof(struct udphdr);
1167         else {
1168                 pr_err("vnet_handle_offloads GSO with unknown transport "
1169                        "protocol %d tproto %d\n", skb->protocol, proto);
1170                 hlen = 128; /* XXX */
1171         }
1172         datalen = port->tsolen - hlen;
1173
1174         gso_size = skb_shinfo(skb)->gso_size;
1175         gso_type = skb_shinfo(skb)->gso_type;
1176         gso_segs = skb_shinfo(skb)->gso_segs;
1177
1178         if (port->tso && gso_size < datalen)
1179                 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
1180
1181         if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
1182                 struct netdev_queue *txq;
1183
1184                 txq  = netdev_get_tx_queue(dev, port->q_index);
1185                 netif_tx_stop_queue(txq);
1186                 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
1187                         return NETDEV_TX_BUSY;
1188                 netif_tx_wake_queue(txq);
1189         }
1190
1191         maclen = skb_network_header(skb) - skb_mac_header(skb);
1192         skb_pull(skb, maclen);
1193
1194         if (port->tso && gso_size < datalen) {
1195                 if (skb_unclone(skb, GFP_ATOMIC))
1196                         goto out_dropped;
1197
1198                 /* segment to TSO size */
1199                 skb_shinfo(skb)->gso_size = datalen;
1200                 skb_shinfo(skb)->gso_segs = gso_segs;
1201         }
1202         segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
1203         if (IS_ERR(segs))
1204                 goto out_dropped;
1205
1206         skb_push(skb, maclen);
1207         skb_reset_mac_header(skb);
1208
1209         status = 0;
1210         while (segs) {
1211                 struct sk_buff *curr = segs;
1212
1213                 segs = segs->next;
1214                 curr->next = NULL;
1215                 if (port->tso && curr->len > dev->mtu) {
1216                         skb_shinfo(curr)->gso_size = gso_size;
1217                         skb_shinfo(curr)->gso_type = gso_type;
1218                         skb_shinfo(curr)->gso_segs =
1219                                 DIV_ROUND_UP(curr->len - hlen, gso_size);
1220                 } else
1221                         skb_shinfo(curr)->gso_size = 0;
1222
1223                 skb_push(curr, maclen);
1224                 skb_reset_mac_header(curr);
1225                 memcpy(skb_mac_header(curr), skb_mac_header(skb),
1226                        maclen);
1227                 curr->csum_start = skb_transport_header(curr) - curr->head;
1228                 if (ip_hdr(curr)->protocol == IPPROTO_TCP)
1229                         curr->csum_offset = offsetof(struct tcphdr, check);
1230                 else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
1231                         curr->csum_offset = offsetof(struct udphdr, check);
1232
1233                 if (!(status & NETDEV_TX_MASK))
1234                         status = vnet_start_xmit(curr, dev);
1235                 if (status & NETDEV_TX_MASK)
1236                         dev_kfree_skb_any(curr);
1237         }
1238
1239         if (!(status & NETDEV_TX_MASK))
1240                 dev_kfree_skb_any(skb);
1241         return status;
1242 out_dropped:
1243         dev->stats.tx_dropped++;
1244         dev_kfree_skb_any(skb);
1245         return NETDEV_TX_OK;
1246 }
1247
1248 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
1249 {
1250         struct vnet *vp = netdev_priv(dev);
1251         struct vnet_port *port = NULL;
1252         struct vio_dring_state *dr;
1253         struct vio_net_desc *d;
1254         unsigned int len;
1255         struct sk_buff *freeskbs = NULL;
1256         int i, err, txi;
1257         unsigned pending = 0;
1258         struct netdev_queue *txq;
1259
1260         rcu_read_lock();
1261         port = __tx_port_find(vp, skb);
1262         if (unlikely(!port)) {
1263                 rcu_read_unlock();
1264                 goto out_dropped;
1265         }
1266
1267         if (skb_is_gso(skb) && skb->len > port->tsolen) {
1268                 err = vnet_handle_offloads(port, skb);
1269                 rcu_read_unlock();
1270                 return err;
1271         }
1272
1273         if (!skb_is_gso(skb) && skb->len > port->rmtu) {
1274                 unsigned long localmtu = port->rmtu - ETH_HLEN;
1275
1276                 if (vio_version_after_eq(&port->vio, 1, 3))
1277                         localmtu -= VLAN_HLEN;
1278
1279                 if (skb->protocol == htons(ETH_P_IP)) {
1280                         struct flowi4 fl4;
1281                         struct rtable *rt = NULL;
1282
1283                         memset(&fl4, 0, sizeof(fl4));
1284                         fl4.flowi4_oif = dev->ifindex;
1285                         fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
1286                         fl4.daddr = ip_hdr(skb)->daddr;
1287                         fl4.saddr = ip_hdr(skb)->saddr;
1288
1289                         rt = ip_route_output_key(dev_net(dev), &fl4);
1290                         rcu_read_unlock();
1291                         if (!IS_ERR(rt)) {
1292                                 skb_dst_set(skb, &rt->dst);
1293                                 icmp_send(skb, ICMP_DEST_UNREACH,
1294                                           ICMP_FRAG_NEEDED,
1295                                           htonl(localmtu));
1296                         }
1297                 }
1298 #if IS_ENABLED(CONFIG_IPV6)
1299                 else if (skb->protocol == htons(ETH_P_IPV6))
1300                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
1301 #endif
1302                 goto out_dropped;
1303         }
1304
1305         skb = vnet_skb_shape(skb, 2);
1306
1307         if (unlikely(!skb))
1308                 goto out_dropped;
1309
1310         if (skb->ip_summed == CHECKSUM_PARTIAL)
1311                 vnet_fullcsum(skb);
1312
1313         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1314         i = skb_get_queue_mapping(skb);
1315         txq = netdev_get_tx_queue(dev, i);
1316         if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1317                 if (!netif_tx_queue_stopped(txq)) {
1318                         netif_tx_stop_queue(txq);
1319
1320                         /* This is a hard error, log it. */
1321                         netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
1322                         dev->stats.tx_errors++;
1323                 }
1324                 rcu_read_unlock();
1325                 return NETDEV_TX_BUSY;
1326         }
1327
1328         d = vio_dring_cur(dr);
1329
1330         txi = dr->prod;
1331
1332         freeskbs = vnet_clean_tx_ring(port, &pending);
1333
1334         BUG_ON(port->tx_bufs[txi].skb);
1335
1336         len = skb->len;
1337         if (len < ETH_ZLEN)
1338                 len = ETH_ZLEN;
1339
1340         err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
1341                            (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
1342         if (err < 0) {
1343                 netdev_info(dev, "tx buffer map error %d\n", err);
1344                 goto out_dropped;
1345         }
1346
1347         port->tx_bufs[txi].skb = skb;
1348         skb = NULL;
1349         port->tx_bufs[txi].ncookies = err;
1350
1351         /* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
1352          * thus it is safe to not set VIO_ACK_ENABLE for each transmission:
1353          * the protocol itself does not require it as long as the peer
1354          * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
1355          *
1356          * An ACK for every packet in the ring is expensive as the
1357          * sending of LDC messages is slow and affects performance.
1358          */
1359         d->hdr.ack = VIO_ACK_DISABLE;
1360         d->size = len;
1361         d->ncookies = port->tx_bufs[txi].ncookies;
1362         for (i = 0; i < d->ncookies; i++)
1363                 d->cookies[i] = port->tx_bufs[txi].cookies[i];
1364         if (vio_version_after_eq(&port->vio, 1, 7)) {
1365                 struct vio_net_dext *dext = vio_net_ext(d);
1366
1367                 memset(dext, 0, sizeof(*dext));
1368                 if (skb_is_gso(port->tx_bufs[txi].skb)) {
1369                         dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
1370                                              ->gso_size;
1371                         dext->flags |= VNET_PKT_IPV4_LSO;
1372                 }
1373                 if (vio_version_after_eq(&port->vio, 1, 8) &&
1374                     !port->switch_port) {
1375                         dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
1376                         dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
1377                 }
1378         }
1379
1380         /* This has to be a non-SMP write barrier because we are writing
1381          * to memory which is shared with the peer LDOM.
1382          */
1383         dma_wmb();
1384
1385         d->hdr.state = VIO_DESC_READY;
1386
1387         /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
1388          * to notify the consumer that some descriptors are READY.
1389          * After that "start" trigger, no additional triggers are needed until
1390          * a DRING_STOPPED is received from the consumer. The dr->cons field
1391          * (set up by vnet_ack()) has the value of the next dring index
1392          * that has not yet been ack-ed. We send a "start" trigger here
1393          * if, and only if, start_cons is true (reset it afterward). Conversely,
1394          * vnet_ack() should check if the dring corresponding to cons
1395          * is marked READY, but start_cons was false.
1396          * If so, vnet_ack() should send out the missed "start" trigger.
1397          *
1398          * Note that the dma_wmb() above makes sure the cookies et al. are
1399          * not globally visible before the VIO_DESC_READY, and that the
1400          * stores are ordered correctly by the compiler. The consumer will
1401          * not proceed until the VIO_DESC_READY is visible assuring that
1402          * the consumer does not observe anything related to descriptors
1403          * out of order. The HV trap from the LDC start trigger is the
1404          * producer to consumer announcement that work is available to the
1405          * consumer
1406          */
1407         if (!port->start_cons)
1408                 goto ldc_start_done; /* previous trigger suffices */
1409
1410         err = __vnet_tx_trigger(port, dr->cons);
1411         if (unlikely(err < 0)) {
1412                 netdev_info(dev, "TX trigger error %d\n", err);
1413                 d->hdr.state = VIO_DESC_FREE;
1414                 skb = port->tx_bufs[txi].skb;
1415                 port->tx_bufs[txi].skb = NULL;
1416                 dev->stats.tx_carrier_errors++;
1417                 goto out_dropped;
1418         }
1419
1420 ldc_start_done:
1421         port->start_cons = false;
1422
1423         dev->stats.tx_packets++;
1424         dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
1425
1426         dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
1427         if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
1428                 netif_tx_stop_queue(txq);
1429                 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
1430                         netif_tx_wake_queue(txq);
1431         }
1432
1433         (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
1434         rcu_read_unlock();
1435
1436         vnet_free_skbs(freeskbs);
1437
1438         return NETDEV_TX_OK;
1439
1440 out_dropped:
1441         if (pending)
1442                 (void)mod_timer(&port->clean_timer,
1443                                 jiffies + VNET_CLEAN_TIMEOUT);
1444         else if (port)
1445                 del_timer(&port->clean_timer);
1446         if (port)
1447                 rcu_read_unlock();
1448         if (skb)
1449                 dev_kfree_skb(skb);
1450         vnet_free_skbs(freeskbs);
1451         dev->stats.tx_dropped++;
1452         return NETDEV_TX_OK;
1453 }
1454
1455 static void vnet_tx_timeout(struct net_device *dev)
1456 {
1457         /* XXX Implement me XXX */
1458 }
1459
1460 static int vnet_open(struct net_device *dev)
1461 {
1462         netif_carrier_on(dev);
1463         netif_tx_start_all_queues(dev);
1464
1465         return 0;
1466 }
1467
1468 static int vnet_close(struct net_device *dev)
1469 {
1470         netif_tx_stop_all_queues(dev);
1471         netif_carrier_off(dev);
1472
1473         return 0;
1474 }
1475
1476 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
1477 {
1478         struct vnet_mcast_entry *m;
1479
1480         for (m = vp->mcast_list; m; m = m->next) {
1481                 if (ether_addr_equal(m->addr, addr))
1482                         return m;
1483         }
1484         return NULL;
1485 }
1486
1487 static void __update_mc_list(struct vnet *vp, struct net_device *dev)
1488 {
1489         struct netdev_hw_addr *ha;
1490
1491         netdev_for_each_mc_addr(ha, dev) {
1492                 struct vnet_mcast_entry *m;
1493
1494                 m = __vnet_mc_find(vp, ha->addr);
1495                 if (m) {
1496                         m->hit = 1;
1497                         continue;
1498                 }
1499
1500                 if (!m) {
1501                         m = kzalloc(sizeof(*m), GFP_ATOMIC);
1502                         if (!m)
1503                                 continue;
1504                         memcpy(m->addr, ha->addr, ETH_ALEN);
1505                         m->hit = 1;
1506
1507                         m->next = vp->mcast_list;
1508                         vp->mcast_list = m;
1509                 }
1510         }
1511 }
1512
1513 static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
1514 {
1515         struct vio_net_mcast_info info;
1516         struct vnet_mcast_entry *m, **pp;
1517         int n_addrs;
1518
1519         memset(&info, 0, sizeof(info));
1520
1521         info.tag.type = VIO_TYPE_CTRL;
1522         info.tag.stype = VIO_SUBTYPE_INFO;
1523         info.tag.stype_env = VNET_MCAST_INFO;
1524         info.tag.sid = vio_send_sid(&port->vio);
1525         info.set = 1;
1526
1527         n_addrs = 0;
1528         for (m = vp->mcast_list; m; m = m->next) {
1529                 if (m->sent)
1530                         continue;
1531                 m->sent = 1;
1532                 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1533                        m->addr, ETH_ALEN);
1534                 if (++n_addrs == VNET_NUM_MCAST) {
1535                         info.count = n_addrs;
1536
1537                         (void) vio_ldc_send(&port->vio, &info,
1538                                             sizeof(info));
1539                         n_addrs = 0;
1540                 }
1541         }
1542         if (n_addrs) {
1543                 info.count = n_addrs;
1544                 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1545         }
1546
1547         info.set = 0;
1548
1549         n_addrs = 0;
1550         pp = &vp->mcast_list;
1551         while ((m = *pp) != NULL) {
1552                 if (m->hit) {
1553                         m->hit = 0;
1554                         pp = &m->next;
1555                         continue;
1556                 }
1557
1558                 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
1559                        m->addr, ETH_ALEN);
1560                 if (++n_addrs == VNET_NUM_MCAST) {
1561                         info.count = n_addrs;
1562                         (void) vio_ldc_send(&port->vio, &info,
1563                                             sizeof(info));
1564                         n_addrs = 0;
1565                 }
1566
1567                 *pp = m->next;
1568                 kfree(m);
1569         }
1570         if (n_addrs) {
1571                 info.count = n_addrs;
1572                 (void) vio_ldc_send(&port->vio, &info, sizeof(info));
1573         }
1574 }
1575
1576 static void vnet_set_rx_mode(struct net_device *dev)
1577 {
1578         struct vnet *vp = netdev_priv(dev);
1579         struct vnet_port *port;
1580
1581         rcu_read_lock();
1582         list_for_each_entry_rcu(port, &vp->port_list, list) {
1583
1584                 if (port->switch_port) {
1585                         __update_mc_list(vp, dev);
1586                         __send_mc_list(vp, port);
1587                         break;
1588                 }
1589         }
1590         rcu_read_unlock();
1591 }
1592
1593 static int vnet_change_mtu(struct net_device *dev, int new_mtu)
1594 {
1595         if (new_mtu < 68 || new_mtu > 65535)
1596                 return -EINVAL;
1597
1598         dev->mtu = new_mtu;
1599         return 0;
1600 }
1601
1602 static int vnet_set_mac_addr(struct net_device *dev, void *p)
1603 {
1604         return -EINVAL;
1605 }
1606
1607 static void vnet_get_drvinfo(struct net_device *dev,
1608                              struct ethtool_drvinfo *info)
1609 {
1610         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
1611         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
1612 }
1613
1614 static u32 vnet_get_msglevel(struct net_device *dev)
1615 {
1616         struct vnet *vp = netdev_priv(dev);
1617         return vp->msg_enable;
1618 }
1619
1620 static void vnet_set_msglevel(struct net_device *dev, u32 value)
1621 {
1622         struct vnet *vp = netdev_priv(dev);
1623         vp->msg_enable = value;
1624 }
1625
1626 static const struct ethtool_ops vnet_ethtool_ops = {
1627         .get_drvinfo            = vnet_get_drvinfo,
1628         .get_msglevel           = vnet_get_msglevel,
1629         .set_msglevel           = vnet_set_msglevel,
1630         .get_link               = ethtool_op_get_link,
1631 };
1632
1633 static void vnet_port_free_tx_bufs(struct vnet_port *port)
1634 {
1635         struct vio_dring_state *dr;
1636         int i;
1637
1638         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1639
1640         if (dr->base == NULL)
1641                 return;
1642
1643         for (i = 0; i < VNET_TX_RING_SIZE; i++) {
1644                 struct vio_net_desc *d;
1645                 void *skb = port->tx_bufs[i].skb;
1646
1647                 if (!skb)
1648                         continue;
1649
1650                 d = vio_dring_entry(dr, i);
1651
1652                 ldc_unmap(port->vio.lp,
1653                           port->tx_bufs[i].cookies,
1654                           port->tx_bufs[i].ncookies);
1655                 dev_kfree_skb(skb);
1656                 port->tx_bufs[i].skb = NULL;
1657                 d->hdr.state = VIO_DESC_FREE;
1658         }
1659         ldc_free_exp_dring(port->vio.lp, dr->base,
1660                            (dr->entry_size * dr->num_entries),
1661                            dr->cookies, dr->ncookies);
1662         dr->base = NULL;
1663         dr->entry_size = 0;
1664         dr->num_entries = 0;
1665         dr->pending = 0;
1666         dr->ncookies = 0;
1667 }
1668
1669 static void vnet_port_reset(struct vnet_port *port)
1670 {
1671         del_timer(&port->clean_timer);
1672         vnet_port_free_tx_bufs(port);
1673         port->rmtu = 0;
1674         port->tso = true;
1675         port->tsolen = 0;
1676 }
1677
1678 static int vnet_port_alloc_tx_ring(struct vnet_port *port)
1679 {
1680         struct vio_dring_state *dr;
1681         unsigned long len, elen;
1682         int i, err, ncookies;
1683         void *dring;
1684
1685         dr = &port->vio.drings[VIO_DRIVER_TX_RING];
1686
1687         elen = sizeof(struct vio_net_desc) +
1688                sizeof(struct ldc_trans_cookie) * 2;
1689         if (vio_version_after_eq(&port->vio, 1, 7))
1690                 elen += sizeof(struct vio_net_dext);
1691         len = VNET_TX_RING_SIZE * elen;
1692
1693         ncookies = VIO_MAX_RING_COOKIES;
1694         dring = ldc_alloc_exp_dring(port->vio.lp, len,
1695                                     dr->cookies, &ncookies,
1696                                     (LDC_MAP_SHADOW |
1697                                      LDC_MAP_DIRECT |
1698                                      LDC_MAP_RW));
1699         if (IS_ERR(dring)) {
1700                 err = PTR_ERR(dring);
1701                 goto err_out;
1702         }
1703
1704         dr->base = dring;
1705         dr->entry_size = elen;
1706         dr->num_entries = VNET_TX_RING_SIZE;
1707         dr->prod = dr->cons = 0;
1708         port->start_cons  = true; /* need an initial trigger */
1709         dr->pending = VNET_TX_RING_SIZE;
1710         dr->ncookies = ncookies;
1711
1712         for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
1713                 struct vio_net_desc *d;
1714
1715                 d = vio_dring_entry(dr, i);
1716                 d->hdr.state = VIO_DESC_FREE;
1717         }
1718         return 0;
1719
1720 err_out:
1721         vnet_port_free_tx_bufs(port);
1722
1723         return err;
1724 }
1725
1726 #ifdef CONFIG_NET_POLL_CONTROLLER
1727 static void vnet_poll_controller(struct net_device *dev)
1728 {
1729         struct vnet *vp = netdev_priv(dev);
1730         struct vnet_port *port;
1731         unsigned long flags;
1732
1733         spin_lock_irqsave(&vp->lock, flags);
1734         if (!list_empty(&vp->port_list)) {
1735                 port = list_entry(vp->port_list.next, struct vnet_port, list);
1736                 napi_schedule(&port->napi);
1737         }
1738         spin_unlock_irqrestore(&vp->lock, flags);
1739 }
1740 #endif
1741 static LIST_HEAD(vnet_list);
1742 static DEFINE_MUTEX(vnet_list_mutex);
1743
1744 static const struct net_device_ops vnet_ops = {
1745         .ndo_open               = vnet_open,
1746         .ndo_stop               = vnet_close,
1747         .ndo_set_rx_mode        = vnet_set_rx_mode,
1748         .ndo_set_mac_address    = vnet_set_mac_addr,
1749         .ndo_validate_addr      = eth_validate_addr,
1750         .ndo_tx_timeout         = vnet_tx_timeout,
1751         .ndo_change_mtu         = vnet_change_mtu,
1752         .ndo_start_xmit         = vnet_start_xmit,
1753         .ndo_select_queue       = vnet_select_queue,
1754 #ifdef CONFIG_NET_POLL_CONTROLLER
1755         .ndo_poll_controller    = vnet_poll_controller,
1756 #endif
1757 };
1758
1759 static struct vnet *vnet_new(const u64 *local_mac,
1760                              struct vio_dev *vdev)
1761 {
1762         struct net_device *dev;
1763         struct vnet *vp;
1764         int err, i;
1765
1766         dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
1767         if (!dev)
1768                 return ERR_PTR(-ENOMEM);
1769         dev->needed_headroom = VNET_PACKET_SKIP + 8;
1770         dev->needed_tailroom = 8;
1771
1772         for (i = 0; i < ETH_ALEN; i++)
1773                 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
1774
1775         vp = netdev_priv(dev);
1776
1777         spin_lock_init(&vp->lock);
1778         vp->dev = dev;
1779
1780         INIT_LIST_HEAD(&vp->port_list);
1781         for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
1782                 INIT_HLIST_HEAD(&vp->port_hash[i]);
1783         INIT_LIST_HEAD(&vp->list);
1784         vp->local_mac = *local_mac;
1785
1786         dev->netdev_ops = &vnet_ops;
1787         dev->ethtool_ops = &vnet_ethtool_ops;
1788         dev->watchdog_timeo = VNET_TX_TIMEOUT;
1789
1790         dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
1791                            NETIF_F_HW_CSUM | NETIF_F_SG;
1792         dev->features = dev->hw_features;
1793
1794         SET_NETDEV_DEV(dev, &vdev->dev);
1795
1796         err = register_netdev(dev);
1797         if (err) {
1798                 pr_err("Cannot register net device, aborting\n");
1799                 goto err_out_free_dev;
1800         }
1801
1802         netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
1803
1804         list_add(&vp->list, &vnet_list);
1805
1806         return vp;
1807
1808 err_out_free_dev:
1809         free_netdev(dev);
1810
1811         return ERR_PTR(err);
1812 }
1813
1814 static struct vnet *vnet_find_or_create(const u64 *local_mac,
1815                                         struct vio_dev *vdev)
1816 {
1817         struct vnet *iter, *vp;
1818
1819         mutex_lock(&vnet_list_mutex);
1820         vp = NULL;
1821         list_for_each_entry(iter, &vnet_list, list) {
1822                 if (iter->local_mac == *local_mac) {
1823                         vp = iter;
1824                         break;
1825                 }
1826         }
1827         if (!vp)
1828                 vp = vnet_new(local_mac, vdev);
1829         mutex_unlock(&vnet_list_mutex);
1830
1831         return vp;
1832 }
1833
1834 static void vnet_cleanup(void)
1835 {
1836         struct vnet *vp;
1837         struct net_device *dev;
1838
1839         mutex_lock(&vnet_list_mutex);
1840         while (!list_empty(&vnet_list)) {
1841                 vp = list_first_entry(&vnet_list, struct vnet, list);
1842                 list_del(&vp->list);
1843                 dev = vp->dev;
1844                 /* vio_unregister_driver() should have cleaned up port_list */
1845                 BUG_ON(!list_empty(&vp->port_list));
1846                 unregister_netdev(dev);
1847                 free_netdev(dev);
1848         }
1849         mutex_unlock(&vnet_list_mutex);
1850 }
1851
1852 static const char *local_mac_prop = "local-mac-address";
1853
1854 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
1855                                      u64 port_node,
1856                                      struct vio_dev *vdev)
1857 {
1858         const u64 *local_mac = NULL;
1859         u64 a;
1860
1861         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
1862                 u64 target = mdesc_arc_target(hp, a);
1863                 const char *name;
1864
1865                 name = mdesc_get_property(hp, target, "name", NULL);
1866                 if (!name || strcmp(name, "network"))
1867                         continue;
1868
1869                 local_mac = mdesc_get_property(hp, target,
1870                                                local_mac_prop, NULL);
1871                 if (local_mac)
1872                         break;
1873         }
1874         if (!local_mac)
1875                 return ERR_PTR(-ENODEV);
1876
1877         return vnet_find_or_create(local_mac, vdev);
1878 }
1879
1880 static struct ldc_channel_config vnet_ldc_cfg = {
1881         .event          = vnet_event,
1882         .mtu            = 64,
1883         .mode           = LDC_MODE_UNRELIABLE,
1884 };
1885
1886 static struct vio_driver_ops vnet_vio_ops = {
1887         .send_attr              = vnet_send_attr,
1888         .handle_attr            = vnet_handle_attr,
1889         .handshake_complete     = vnet_handshake_complete,
1890 };
1891
1892 static void print_version(void)
1893 {
1894         printk_once(KERN_INFO "%s", version);
1895 }
1896
1897 const char *remote_macaddr_prop = "remote-mac-address";
1898
1899 static void
1900 vnet_port_add_txq(struct vnet_port *port)
1901 {
1902         struct vnet *vp = port->vp;
1903         int n;
1904
1905         n = vp->nports++;
1906         n = n & (VNET_MAX_TXQS - 1);
1907         port->q_index = n;
1908         netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
1909 }
1910
1911 static void
1912 vnet_port_rm_txq(struct vnet_port *port)
1913 {
1914         port->vp->nports--;
1915         netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
1916 }
1917
1918 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1919 {
1920         struct mdesc_handle *hp;
1921         struct vnet_port *port;
1922         unsigned long flags;
1923         struct vnet *vp;
1924         const u64 *rmac;
1925         int len, i, err, switch_port;
1926
1927         print_version();
1928
1929         hp = mdesc_grab();
1930
1931         vp = vnet_find_parent(hp, vdev->mp, vdev);
1932         if (IS_ERR(vp)) {
1933                 pr_err("Cannot find port parent vnet\n");
1934                 err = PTR_ERR(vp);
1935                 goto err_out_put_mdesc;
1936         }
1937
1938         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
1939         err = -ENODEV;
1940         if (!rmac) {
1941                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
1942                 goto err_out_put_mdesc;
1943         }
1944
1945         port = kzalloc(sizeof(*port), GFP_KERNEL);
1946         err = -ENOMEM;
1947         if (!port)
1948                 goto err_out_put_mdesc;
1949
1950         for (i = 0; i < ETH_ALEN; i++)
1951                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
1952
1953         port->vp = vp;
1954
1955         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
1956                               vnet_versions, ARRAY_SIZE(vnet_versions),
1957                               &vnet_vio_ops, vp->dev->name);
1958         if (err)
1959                 goto err_out_free_port;
1960
1961         err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
1962         if (err)
1963                 goto err_out_free_port;
1964
1965         netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
1966
1967         INIT_HLIST_NODE(&port->hash);
1968         INIT_LIST_HEAD(&port->list);
1969
1970         switch_port = 0;
1971         if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
1972                 switch_port = 1;
1973         port->switch_port = switch_port;
1974         port->tso = true;
1975         port->tsolen = 0;
1976
1977         spin_lock_irqsave(&vp->lock, flags);
1978         if (switch_port)
1979                 list_add_rcu(&port->list, &vp->port_list);
1980         else
1981                 list_add_tail_rcu(&port->list, &vp->port_list);
1982         hlist_add_head_rcu(&port->hash,
1983                            &vp->port_hash[vnet_hashfn(port->raddr)]);
1984         vnet_port_add_txq(port);
1985         spin_unlock_irqrestore(&vp->lock, flags);
1986
1987         dev_set_drvdata(&vdev->dev, port);
1988
1989         pr_info("%s: PORT ( remote-mac %pM%s )\n",
1990                 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
1991
1992         setup_timer(&port->clean_timer, vnet_clean_timer_expire,
1993                     (unsigned long)port);
1994
1995         napi_enable(&port->napi);
1996         vio_port_up(&port->vio);
1997
1998         mdesc_release(hp);
1999
2000         return 0;
2001
2002 err_out_free_port:
2003         kfree(port);
2004
2005 err_out_put_mdesc:
2006         mdesc_release(hp);
2007         return err;
2008 }
2009
2010 static int vnet_port_remove(struct vio_dev *vdev)
2011 {
2012         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
2013
2014         if (port) {
2015
2016                 del_timer_sync(&port->vio.timer);
2017
2018                 napi_disable(&port->napi);
2019
2020                 list_del_rcu(&port->list);
2021                 hlist_del_rcu(&port->hash);
2022
2023                 synchronize_rcu();
2024                 del_timer_sync(&port->clean_timer);
2025                 vnet_port_rm_txq(port);
2026                 netif_napi_del(&port->napi);
2027                 vnet_port_free_tx_bufs(port);
2028                 vio_ldc_free(&port->vio);
2029
2030                 dev_set_drvdata(&vdev->dev, NULL);
2031
2032                 kfree(port);
2033
2034         }
2035         return 0;
2036 }
2037
2038 static const struct vio_device_id vnet_port_match[] = {
2039         {
2040                 .type = "vnet-port",
2041         },
2042         {},
2043 };
2044 MODULE_DEVICE_TABLE(vio, vnet_port_match);
2045
2046 static struct vio_driver vnet_port_driver = {
2047         .id_table       = vnet_port_match,
2048         .probe          = vnet_port_probe,
2049         .remove         = vnet_port_remove,
2050         .name           = "vnet_port",
2051 };
2052
2053 static int __init vnet_init(void)
2054 {
2055         return vio_register_driver(&vnet_port_driver);
2056 }
2057
2058 static void __exit vnet_exit(void)
2059 {
2060         vio_unregister_driver(&vnet_port_driver);
2061         vnet_cleanup();
2062 }
2063
2064 module_init(vnet_init);
2065 module_exit(vnet_exit);