release/src-rt-6.x/linux/linux-2.6/drivers/net/tulip/interrupt.c

   1 /*
   2         drivers/net/tulip/interrupt.c
   3
   4         Maintained by Valerie Henson <val_henson@linux.intel.com>
   5         Copyright 2000,2001  The Linux Kernel Team
   6         Written/copyright 1994-2001 by Donald Becker.
   7
   8         This software may be used and distributed according to the terms
   9         of the GNU General Public License, incorporated herein by reference.
  10
  11         Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
  12         for more information on this driver, or visit the project
  13         Web page at http://sourceforge.net/projects/tulip/
  14
  15 */
  16
  17 #include <linux/pci.h>
  18 #include "tulip.h"
  19 #include <linux/etherdevice.h>
  20
  21 int tulip_rx_copybreak;
  22 unsigned int tulip_max_interrupt_work;
  23
  24 #ifdef CONFIG_TULIP_NAPI_HW_MITIGATION
  25 #define MIT_SIZE 15
  26 #define MIT_TABLE 15 /* We use 0 or max */
  27
  28 static unsigned int mit_table[MIT_SIZE+1] =
  29 {
  30         /*  CRS11 21143 hardware Mitigation Control Interrupt
  31             We use only RX mitigation we other techniques for
  32             TX intr. mitigation.
  33
  34            31    Cycle Size (timer control)
  35            30:27 TX timer in 16 * Cycle size
  36            26:24 TX No pkts before Int.
  37            23:20 RX timer in Cycle size
  38            19:17 RX No pkts before Int.
  39            16       Continues Mode (CM)
  40         */
  41
  42         0x0,             /* IM disabled */
  43         0x80150000,      /* RX time = 1, RX pkts = 2, CM = 1 */
  44         0x80150000,
  45         0x80270000,
  46         0x80370000,
  47         0x80490000,
  48         0x80590000,
  49         0x80690000,
  50         0x807B0000,
  51         0x808B0000,
  52         0x809D0000,
  53         0x80AD0000,
  54         0x80BD0000,
  55         0x80CF0000,
  56         0x80DF0000,
  57 //       0x80FF0000      /* RX time = 16, RX pkts = 7, CM = 1 */
  58         0x80F10000      /* RX time = 16, RX pkts = 0, CM = 1 */
  59 };
  60 #endif
  61
  62
  63 int tulip_refill_rx(struct net_device *dev)
  64 {
  65         struct tulip_private *tp = netdev_priv(dev);
  66         int entry;
  67         int refilled = 0;
  68
  69         /* Refill the Rx ring buffers. */
  70         for (; tp->cur_rx - tp->dirty_rx > 0; tp->dirty_rx++) {
  71                 entry = tp->dirty_rx % RX_RING_SIZE;
  72                 if (tp->rx_buffers[entry].skb == NULL) {
  73                         struct sk_buff *skb;
  74                         dma_addr_t mapping;
  75
  76                         skb = tp->rx_buffers[entry].skb = dev_alloc_skb(PKT_BUF_SZ);
  77                         if (skb == NULL)
  78                                 break;
  79
  80                         mapping = pci_map_single(tp->pdev, skb->data, PKT_BUF_SZ,
  81                                                  PCI_DMA_FROMDEVICE);
  82                         tp->rx_buffers[entry].mapping = mapping;
  83
  84                         skb->dev = dev;                 /* Mark as being used by this device. */
  85                         tp->rx_ring[entry].buffer1 = cpu_to_le32(mapping);
  86                         refilled++;
  87                 }
  88                 tp->rx_ring[entry].status = cpu_to_le32(DescOwned);
  89         }
  90         if(tp->chip_id == LC82C168) {
  91                 if(((ioread32(tp->base_addr + CSR5)>>17)&0x07) == 4) {
  92                         /* Rx stopped due to out of buffers,
  93                          * restart it
  94                          */
  95                         iowrite32(0x01, tp->base_addr + CSR2);
  96                 }
  97         }
  98         return refilled;
  99 }
 100
 101 #ifdef CONFIG_TULIP_NAPI
 102
 103 void oom_timer(unsigned long data)
 104 {
 105         struct net_device *dev = (struct net_device *)data;
 106         netif_rx_schedule(dev);
 107 }
 108
 109 int tulip_poll(struct net_device *dev, int *budget)
 110 {
 111         struct tulip_private *tp = netdev_priv(dev);
 112         int entry = tp->cur_rx % RX_RING_SIZE;
 113         int rx_work_limit = *budget;
 114         int received = 0;
 115
 116         if (!netif_running(dev))
 117                 goto done;
 118
 119         if (rx_work_limit > dev->quota)
 120                 rx_work_limit = dev->quota;
 121
 122 #ifdef CONFIG_TULIP_NAPI_HW_MITIGATION
 123
 124 /* that one buffer is needed for mit activation; or might be a
 125    bug in the ring buffer code; check later -- JHS*/
 126
 127         if (rx_work_limit >=RX_RING_SIZE) rx_work_limit--;
 128 #endif
 129
 130         if (tulip_debug > 4)
 131                 printk(KERN_DEBUG " In tulip_rx(), entry %d %8.8x.\n", entry,
 132                            tp->rx_ring[entry].status);
 133
 134        do {
 135                 if (ioread32(tp->base_addr + CSR5) == 0xffffffff) {
 136                         printk(KERN_DEBUG " In tulip_poll(), hardware disappeared.\n");
 137                         break;
 138                 }
 139                /* Acknowledge current RX interrupt sources. */
 140                iowrite32((RxIntr | RxNoBuf), tp->base_addr + CSR5);
 141
 142
 143                /* If we own the next entry, it is a new packet. Send it up. */
 144                while ( ! (tp->rx_ring[entry].status & cpu_to_le32(DescOwned))) {
 145                        s32 status = le32_to_cpu(tp->rx_ring[entry].status);
 146
 147
 148                        if (tp->dirty_rx + RX_RING_SIZE == tp->cur_rx)
 149                                break;
 150
 151                        if (tulip_debug > 5)
 152                                printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %8.8x.\n",
 153                                       dev->name, entry, status);
 154                        if (--rx_work_limit < 0)
 155                                goto not_done;
 156
 157                        if ((status & 0x38008300) != 0x0300) {
 158                                if ((status & 0x38000300) != 0x0300) {
 159                                 /* Ingore earlier buffers. */
 160                                        if ((status & 0xffff) != 0x7fff) {
 161                                                if (tulip_debug > 1)
 162                                                        printk(KERN_WARNING "%s: Oversized Ethernet frame "
 163                                                               "spanned multiple buffers, status %8.8x!\n",
 164                                                               dev->name, status);
 165                                                tp->stats.rx_length_errors++;
 166                                        }
 167                                } else if (status & RxDescFatalErr) {
 168                                 /* There was a fatal error. */
 169                                        if (tulip_debug > 2)
 170                                                printk(KERN_DEBUG "%s: Receive error, Rx status %8.8x.\n",
 171                                                       dev->name, status);
 172                                        tp->stats.rx_errors++; /* end of a packet.*/
 173                                        if (status & 0x0890) tp->stats.rx_length_errors++;
 174                                        if (status & 0x0004) tp->stats.rx_frame_errors++;
 175                                        if (status & 0x0002) tp->stats.rx_crc_errors++;
 176                                        if (status & 0x0001) tp->stats.rx_fifo_errors++;
 177                                }
 178                        } else {
 179                                /* Omit the four octet CRC from the length. */
 180                                short pkt_len = ((status >> 16) & 0x7ff) - 4;
 181                                struct sk_buff *skb;
 182
 183 #ifndef final_version
 184                                if (pkt_len > 1518) {
 185                                        printk(KERN_WARNING "%s: Bogus packet size of %d (%#x).\n",
 186                                               dev->name, pkt_len, pkt_len);
 187                                        pkt_len = 1518;
 188                                        tp->stats.rx_length_errors++;
 189                                }
 190 #endif
 191                                /* Check if the packet is long enough to accept without copying
 192                                   to a minimally-sized skbuff. */
 193                                if (pkt_len < tulip_rx_copybreak
 194                                    && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
 195                                        skb_reserve(skb, 2);    /* 16 byte align the IP header */
 196                                        pci_dma_sync_single_for_cpu(tp->pdev,
 197                                                                    tp->rx_buffers[entry].mapping,
 198                                                                    pkt_len, PCI_DMA_FROMDEVICE);
 199 #if ! defined(__alpha__)
 200                                        eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->data,
 201                                                         pkt_len, 0);
 202                                        skb_put(skb, pkt_len);
 203 #else
 204                                        memcpy(skb_put(skb, pkt_len),
 205                                               tp->rx_buffers[entry].skb->data,
 206                                               pkt_len);
 207 #endif
 208                                        pci_dma_sync_single_for_device(tp->pdev,
 209                                                                       tp->rx_buffers[entry].mapping,
 210                                                                       pkt_len, PCI_DMA_FROMDEVICE);
 211                                } else {        /* Pass up the skb already on the Rx ring. */
 212                                        char *temp = skb_put(skb = tp->rx_buffers[entry].skb,
 213                                                             pkt_len);
 214
 215 #ifndef final_version
 216                                        if (tp->rx_buffers[entry].mapping !=
 217                                            le32_to_cpu(tp->rx_ring[entry].buffer1)) {
 218                                                printk(KERN_ERR "%s: Internal fault: The skbuff addresses "
 219                                                       "do not match in tulip_rx: %08x vs. %08llx %p / %p.\n",
 220                                                       dev->name,
 221                                                       le32_to_cpu(tp->rx_ring[entry].buffer1),
 222                                                       (unsigned long long)tp->rx_buffers[entry].mapping,
 223                                                       skb->head, temp);
 224                                        }
 225 #endif
 226
 227                                        pci_unmap_single(tp->pdev, tp->rx_buffers[entry].mapping,
 228                                                         PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
 229
 230                                        tp->rx_buffers[entry].skb = NULL;
 231                                        tp->rx_buffers[entry].mapping = 0;
 232                                }
 233                                skb->protocol = eth_type_trans(skb, dev);
 234
 235                                netif_receive_skb(skb);
 236
 237                                dev->last_rx = jiffies;
 238                                tp->stats.rx_packets++;
 239                                tp->stats.rx_bytes += pkt_len;
 240                        }
 241                        received++;
 242
 243                        entry = (++tp->cur_rx) % RX_RING_SIZE;
 244                        if (tp->cur_rx - tp->dirty_rx > RX_RING_SIZE/4)
 245                                tulip_refill_rx(dev);
 246
 247                 }
 248
 249                /* New ack strategy... irq does not ack Rx any longer
 250                   hopefully this helps */
 251
 252                /* Really bad things can happen here... If new packet arrives
 253                 * and an irq arrives (tx or just due to occasionally unset
 254                 * mask), it will be acked by irq handler, but new thread
 255                 * is not scheduled. It is major hole in design.
 256                 * No idea how to fix this if "playing with fire" will fail
 257                 * tomorrow (night 011029). If it will not fail, we won
 258                 * finally: amount of IO did not increase at all. */
 259        } while ((ioread32(tp->base_addr + CSR5) & RxIntr));
 260
 261 done:
 262
 263  #ifdef CONFIG_TULIP_NAPI_HW_MITIGATION
 264
 265           /* We use this simplistic scheme for IM. It's proven by
 266              real life installations. We can have IM enabled
 267             continuesly but this would cause unnecessary latency.
 268             Unfortunely we can't use all the NET_RX_* feedback here.
 269             This would turn on IM for devices that is not contributing
 270             to backlog congestion with unnecessary latency.
 271
 272              We monitor the device RX-ring and have:
 273
 274              HW Interrupt Mitigation either ON or OFF.
 275
 276             ON:  More then 1 pkt received (per intr.) OR we are dropping
 277              OFF: Only 1 pkt received
 278
 279              Note. We only use min and max (0, 15) settings from mit_table */
 280
 281
 282           if( tp->flags &  HAS_INTR_MITIGATION) {
 283                  if( received > 1 ) {
 284                          if( ! tp->mit_on ) {
 285                                  tp->mit_on = 1;
 286                                  iowrite32(mit_table[MIT_TABLE], tp->base_addr + CSR11);
 287                          }
 288                   }
 289                  else {
 290                          if( tp->mit_on ) {
 291                                  tp->mit_on = 0;
 292                                  iowrite32(0, tp->base_addr + CSR11);
 293                          }
 294                   }
 295           }
 296
 297 #endif /* CONFIG_TULIP_NAPI_HW_MITIGATION */
 298
 299          dev->quota -= received;
 300          *budget -= received;
 301
 302          tulip_refill_rx(dev);
 303
 304          /* If RX ring is not full we are out of memory. */
 305          if (tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) goto oom;
 306
 307          /* Remove us from polling list and enable RX intr. */
 308
 309          netif_rx_complete(dev);
 310          iowrite32(tulip_tbl[tp->chip_id].valid_intrs, tp->base_addr+CSR7);
 311
 312          /* The last op happens after poll completion. Which means the following:
 313           * 1. it can race with disabling irqs in irq handler
 314           * 2. it can race with dise/enabling irqs in other poll threads
 315           * 3. if an irq raised after beginning loop, it will be immediately
 316           *    triggered here.
 317           *
 318           * Summarizing: the logic results in some redundant irqs both
 319           * due to races in masking and due to too late acking of already
 320           * processed irqs. But it must not result in losing events.
 321           */
 322
 323          return 0;
 324
 325  not_done:
 326          if (!received) {
 327
 328                  received = dev->quota; /* Not to happen */
 329          }
 330          dev->quota -= received;
 331          *budget -= received;
 332
 333          if (tp->cur_rx - tp->dirty_rx > RX_RING_SIZE/2 ||
 334              tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL)
 335                  tulip_refill_rx(dev);
 336
 337          if (tp->rx_buffers[tp->dirty_rx % RX_RING_SIZE].skb == NULL) goto oom;
 338
 339          return 1;
 340
 341
 342  oom:    /* Executed with RX ints disabled */
 343
 344
 345          /* Start timer, stop polling, but do not enable rx interrupts. */
 346          mod_timer(&tp->oom_timer, jiffies+1);
 347
 348          /* Think: timer_pending() was an explicit signature of bug.
 349           * Timer can be pending now but fired and completed
 350           * before we did netif_rx_complete(). See? We would lose it. */
 351
 352          /* remove ourselves from the polling list */
 353          netif_rx_complete(dev);
 354
 355          return 0;
 356 }
 357
 358 #else /* CONFIG_TULIP_NAPI */
 359
 360 static int tulip_rx(struct net_device *dev)
 361 {
 362         struct tulip_private *tp = netdev_priv(dev);
 363         int entry = tp->cur_rx % RX_RING_SIZE;
 364         int rx_work_limit = tp->dirty_rx + RX_RING_SIZE - tp->cur_rx;
 365         int received = 0;
 366
 367         if (tulip_debug > 4)
 368                 printk(KERN_DEBUG " In tulip_rx(), entry %d %8.8x.\n", entry,
 369                            tp->rx_ring[entry].status);
 370         /* If we own the next entry, it is a new packet. Send it up. */
 371         while ( ! (tp->rx_ring[entry].status & cpu_to_le32(DescOwned))) {
 372                 s32 status = le32_to_cpu(tp->rx_ring[entry].status);
 373
 374                 if (tulip_debug > 5)
 375                         printk(KERN_DEBUG "%s: In tulip_rx(), entry %d %8.8x.\n",
 376                                    dev->name, entry, status);
 377                 if (--rx_work_limit < 0)
 378                         break;
 379                 if ((status & 0x38008300) != 0x0300) {
 380                         if ((status & 0x38000300) != 0x0300) {
 381                                 /* Ingore earlier buffers. */
 382                                 if ((status & 0xffff) != 0x7fff) {
 383                                         if (tulip_debug > 1)
 384                                                 printk(KERN_WARNING "%s: Oversized Ethernet frame "
 385                                                            "spanned multiple buffers, status %8.8x!\n",
 386                                                            dev->name, status);
 387                                         tp->stats.rx_length_errors++;
 388                                 }
 389                         } else if (status & RxDescFatalErr) {
 390                                 /* There was a fatal error. */
 391                                 if (tulip_debug > 2)
 392                                         printk(KERN_DEBUG "%s: Receive error, Rx status %8.8x.\n",
 393                                                    dev->name, status);
 394                                 tp->stats.rx_errors++; /* end of a packet.*/
 395                                 if (status & 0x0890) tp->stats.rx_length_errors++;
 396                                 if (status & 0x0004) tp->stats.rx_frame_errors++;
 397                                 if (status & 0x0002) tp->stats.rx_crc_errors++;
 398                                 if (status & 0x0001) tp->stats.rx_fifo_errors++;
 399                         }
 400                 } else {
 401                         /* Omit the four octet CRC from the length. */
 402                         short pkt_len = ((status >> 16) & 0x7ff) - 4;
 403                         struct sk_buff *skb;
 404
 405 #ifndef final_version
 406                         if (pkt_len > 1518) {
 407                                 printk(KERN_WARNING "%s: Bogus packet size of %d (%#x).\n",
 408                                            dev->name, pkt_len, pkt_len);
 409                                 pkt_len = 1518;
 410                                 tp->stats.rx_length_errors++;
 411                         }
 412 #endif
 413
 414                         /* Check if the packet is long enough to accept without copying
 415                            to a minimally-sized skbuff. */
 416                         if (pkt_len < tulip_rx_copybreak
 417                                 && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
 418                                 skb_reserve(skb, 2);    /* 16 byte align the IP header */
 419                                 pci_dma_sync_single_for_cpu(tp->pdev,
 420                                                             tp->rx_buffers[entry].mapping,
 421                                                             pkt_len, PCI_DMA_FROMDEVICE);
 422 #if ! defined(__alpha__)
 423                                 eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->data,
 424                                                  pkt_len, 0);
 425                                 skb_put(skb, pkt_len);
 426 #else
 427                                 memcpy(skb_put(skb, pkt_len),
 428                                        tp->rx_buffers[entry].skb->data,
 429                                        pkt_len);
 430 #endif
 431                                 pci_dma_sync_single_for_device(tp->pdev,
 432                                                                tp->rx_buffers[entry].mapping,
 433                                                                pkt_len, PCI_DMA_FROMDEVICE);
 434                         } else {        /* Pass up the skb already on the Rx ring. */
 435                                 char *temp = skb_put(skb = tp->rx_buffers[entry].skb,
 436                                                      pkt_len);
 437
 438 #ifndef final_version
 439                                 if (tp->rx_buffers[entry].mapping !=
 440                                     le32_to_cpu(tp->rx_ring[entry].buffer1)) {
 441                                         printk(KERN_ERR "%s: Internal fault: The skbuff addresses "
 442                                                "do not match in tulip_rx: %08x vs. %Lx %p / %p.\n",
 443                                                dev->name,
 444                                                le32_to_cpu(tp->rx_ring[entry].buffer1),
 445                                                (long long)tp->rx_buffers[entry].mapping,
 446                                                skb->head, temp);
 447                                 }
 448 #endif
 449
 450                                 pci_unmap_single(tp->pdev, tp->rx_buffers[entry].mapping,
 451                                                  PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
 452
 453                                 tp->rx_buffers[entry].skb = NULL;
 454                                 tp->rx_buffers[entry].mapping = 0;
 455                         }
 456                         skb->protocol = eth_type_trans(skb, dev);
 457
 458                         netif_rx(skb);
 459
 460                         dev->last_rx = jiffies;
 461                         tp->stats.rx_packets++;
 462                         tp->stats.rx_bytes += pkt_len;
 463                 }
 464                 received++;
 465                 entry = (++tp->cur_rx) % RX_RING_SIZE;
 466         }
 467         return received;
 468 }
 469 #endif  /* CONFIG_TULIP_NAPI */
 470
 471 static inline unsigned int phy_interrupt (struct net_device *dev)
 472 {
 473 #ifdef __hppa__
 474         struct tulip_private *tp = netdev_priv(dev);
 475         int csr12 = ioread32(tp->base_addr + CSR12) & 0xff;
 476
 477         if (csr12 != tp->csr12_shadow) {
 478                 /* ack interrupt */
 479                 iowrite32(csr12 | 0x02, tp->base_addr + CSR12);
 480                 tp->csr12_shadow = csr12;
 481                 /* do link change stuff */
 482                 spin_lock(&tp->lock);
 483                 tulip_check_duplex(dev);
 484                 spin_unlock(&tp->lock);
 485                 /* clear irq ack bit */
 486                 iowrite32(csr12 & ~0x02, tp->base_addr + CSR12);
 487
 488                 return 1;
 489         }
 490 #endif
 491
 492         return 0;
 493 }
 494
 495 /* The interrupt handler does all of the Rx thread work and cleans up
 496    after the Tx thread. */
 497 irqreturn_t tulip_interrupt(int irq, void *dev_instance)
 498 {
 499         struct net_device *dev = (struct net_device *)dev_instance;
 500         struct tulip_private *tp = netdev_priv(dev);
 501         void __iomem *ioaddr = tp->base_addr;
 502         int csr5;
 503         int missed;
 504         int rx = 0;
 505         int tx = 0;
 506         int oi = 0;
 507         int maxrx = RX_RING_SIZE;
 508         int maxtx = TX_RING_SIZE;
 509         int maxoi = TX_RING_SIZE;
 510 #ifdef CONFIG_TULIP_NAPI
 511         int rxd = 0;
 512 #else
 513         int entry;
 514 #endif
 515         unsigned int work_count = tulip_max_interrupt_work;
 516         unsigned int handled = 0;
 517
 518         /* Let's see whether the interrupt really is for us */
 519         csr5 = ioread32(ioaddr + CSR5);
 520
 521         if (tp->flags & HAS_PHY_IRQ)
 522                 handled = phy_interrupt (dev);
 523
 524         if ((csr5 & (NormalIntr|AbnormalIntr)) == 0)
 525                 return IRQ_RETVAL(handled);
 526
 527         tp->nir++;
 528
 529         do {
 530
 531 #ifdef CONFIG_TULIP_NAPI
 532
 533                 if (!rxd && (csr5 & (RxIntr | RxNoBuf))) {
 534                         rxd++;
 535                         /* Mask RX intrs and add the device to poll list. */
 536                         iowrite32(tulip_tbl[tp->chip_id].valid_intrs&~RxPollInt, ioaddr + CSR7);
 537                         netif_rx_schedule(dev);
 538
 539                         if (!(csr5&~(AbnormalIntr|NormalIntr|RxPollInt|TPLnkPass)))
 540                                break;
 541                 }
 542
 543                /* Acknowledge the interrupt sources we handle here ASAP
 544                   the poll function does Rx and RxNoBuf acking */
 545
 546                 iowrite32(csr5 & 0x0001ff3f, ioaddr + CSR5);
 547
 548 #else
 549                 /* Acknowledge all of the current interrupt sources ASAP. */
 550                 iowrite32(csr5 & 0x0001ffff, ioaddr + CSR5);
 551
 552
 553                 if (csr5 & (RxIntr | RxNoBuf)) {
 554                                 rx += tulip_rx(dev);
 555                         tulip_refill_rx(dev);
 556                 }
 557
 558 #endif /*  CONFIG_TULIP_NAPI */
 559
 560                 if (tulip_debug > 4)
 561                         printk(KERN_DEBUG "%s: interrupt  csr5=%#8.8x new csr5=%#8.8x.\n",
 562                                dev->name, csr5, ioread32(ioaddr + CSR5));
 563
 564
 565                 if (csr5 & (TxNoBuf | TxDied | TxIntr | TimerInt)) {
 566                         unsigned int dirty_tx;
 567
 568                         spin_lock(&tp->lock);
 569
 570                         for (dirty_tx = tp->dirty_tx; tp->cur_tx - dirty_tx > 0;
 571                                  dirty_tx++) {
 572                                 int entry = dirty_tx % TX_RING_SIZE;
 573                                 int status = le32_to_cpu(tp->tx_ring[entry].status);
 574
 575                                 if (status < 0)
 576                                         break;                  /* It still has not been Txed */
 577
 578                                 /* Check for Rx filter setup frames. */
 579                                 if (tp->tx_buffers[entry].skb == NULL) {
 580                                         /* test because dummy frames not mapped */
 581                                         if (tp->tx_buffers[entry].mapping)
 582                                                 pci_unmap_single(tp->pdev,
 583                                                          tp->tx_buffers[entry].mapping,
 584                                                          sizeof(tp->setup_frame),
 585                                                          PCI_DMA_TODEVICE);
 586                                         continue;
 587                                 }
 588
 589                                 if (status & 0x8000) {
 590                                         /* There was an major error, log it. */
 591 #ifndef final_version
 592                                         if (tulip_debug > 1)
 593                                                 printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
 594                                                            dev->name, status);
 595 #endif
 596                                         tp->stats.tx_errors++;
 597                                         if (status & 0x4104) tp->stats.tx_aborted_errors++;
 598                                         if (status & 0x0C00) tp->stats.tx_carrier_errors++;
 599                                         if (status & 0x0200) tp->stats.tx_window_errors++;
 600                                         if (status & 0x0002) tp->stats.tx_fifo_errors++;
 601                                         if ((status & 0x0080) && tp->full_duplex == 0)
 602                                                 tp->stats.tx_heartbeat_errors++;
 603                                 } else {
 604                                         tp->stats.tx_bytes +=
 605                                                 tp->tx_buffers[entry].skb->len;
 606                                         tp->stats.collisions += (status >> 3) & 15;
 607                                         tp->stats.tx_packets++;
 608                                 }
 609
 610                                 pci_unmap_single(tp->pdev, tp->tx_buffers[entry].mapping,
 611                                                  tp->tx_buffers[entry].skb->len,
 612                                                  PCI_DMA_TODEVICE);
 613
 614                                 /* Free the original skb. */
 615                                 dev_kfree_skb_irq(tp->tx_buffers[entry].skb);
 616                                 tp->tx_buffers[entry].skb = NULL;
 617                                 tp->tx_buffers[entry].mapping = 0;
 618                                 tx++;
 619                         }
 620
 621 #ifndef final_version
 622                         if (tp->cur_tx - dirty_tx > TX_RING_SIZE) {
 623                                 printk(KERN_ERR "%s: Out-of-sync dirty pointer, %d vs. %d.\n",
 624                                            dev->name, dirty_tx, tp->cur_tx);
 625                                 dirty_tx += TX_RING_SIZE;
 626                         }
 627 #endif
 628
 629                         if (tp->cur_tx - dirty_tx < TX_RING_SIZE - 2)
 630                                 netif_wake_queue(dev);
 631
 632                         tp->dirty_tx = dirty_tx;
 633                         if (csr5 & TxDied) {
 634                                 if (tulip_debug > 2)
 635                                         printk(KERN_WARNING "%s: The transmitter stopped."
 636                                                    "  CSR5 is %x, CSR6 %x, new CSR6 %x.\n",
 637                                                    dev->name, csr5, ioread32(ioaddr + CSR6), tp->csr6);
 638                                 tulip_restart_rxtx(tp);
 639                         }
 640                         spin_unlock(&tp->lock);
 641                 }
 642
 643                 /* Log errors. */
 644                 if (csr5 & AbnormalIntr) {      /* Abnormal error summary bit. */
 645                         if (csr5 == 0xffffffff)
 646                                 break;
 647                         if (csr5 & TxJabber) tp->stats.tx_errors++;
 648                         if (csr5 & TxFIFOUnderflow) {
 649                                 if ((tp->csr6 & 0xC000) != 0xC000)
 650                                         tp->csr6 += 0x4000;     /* Bump up the Tx threshold */
 651                                 else
 652                                         tp->csr6 |= 0x00200000;  /* Store-n-forward. */
 653                                 /* Restart the transmit process. */
 654                                 tulip_restart_rxtx(tp);
 655                                 iowrite32(0, ioaddr + CSR1);
 656                         }
 657                         if (csr5 & (RxDied | RxNoBuf)) {
 658                                 if (tp->flags & COMET_MAC_ADDR) {
 659                                         iowrite32(tp->mc_filter[0], ioaddr + 0xAC);
 660                                         iowrite32(tp->mc_filter[1], ioaddr + 0xB0);
 661                                 }
 662                         }
 663                         if (csr5 & RxDied) {            /* Missed a Rx frame. */
 664                                 tp->stats.rx_missed_errors += ioread32(ioaddr + CSR8) & 0xffff;
 665                                 tp->stats.rx_errors++;
 666                                 tulip_start_rxtx(tp);
 667                         }
 668                         /*
 669                          * NB: t21142_lnk_change() does a del_timer_sync(), so be careful if this
 670                          * call is ever done under the spinlock
 671                          */
 672                         if (csr5 & (TPLnkPass | TPLnkFail | 0x08000000)) {
 673                                 if (tp->link_change)
 674                                         (tp->link_change)(dev, csr5);
 675                         }
 676                         if (csr5 & SystemError) {
 677                                 int error = (csr5 >> 23) & 7;
 678                                 /* oops, we hit a PCI error.  The code produced corresponds
 679                                  * to the reason:
 680                                  *  0 - parity error
 681                                  *  1 - master abort
 682                                  *  2 - target abort
 683                                  * Note that on parity error, we should do a software reset
 684                                  * of the chip to get it back into a sane state (according
 685                                  * to the 21142/3 docs that is).
 686                                  *   -- rmk
 687                                  */
 688                                 printk(KERN_ERR "%s: (%lu) System Error occurred (%d)\n",
 689                                         dev->name, tp->nir, error);
 690                         }
 691                         /* Clear all error sources, included undocumented ones! */
 692                         iowrite32(0x0800f7ba, ioaddr + CSR5);
 693                         oi++;
 694                 }
 695                 if (csr5 & TimerInt) {
 696
 697                         if (tulip_debug > 2)
 698                                 printk(KERN_ERR "%s: Re-enabling interrupts, %8.8x.\n",
 699                                            dev->name, csr5);
 700                         iowrite32(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR7);
 701                         tp->ttimer = 0;
 702                         oi++;
 703                 }
 704                 if (tx > maxtx || rx > maxrx || oi > maxoi) {
 705                         if (tulip_debug > 1)
 706                                 printk(KERN_WARNING "%s: Too much work during an interrupt, "
 707                                            "csr5=0x%8.8x. (%lu) (%d,%d,%d)\n", dev->name, csr5, tp->nir, tx, rx, oi);
 708
 709                        /* Acknowledge all interrupt sources. */
 710                         iowrite32(0x8001ffff, ioaddr + CSR5);
 711                         if (tp->flags & HAS_INTR_MITIGATION) {
 712                      /* Josip Loncaric at ICASE did extensive experimentation
 713                         to develop a good interrupt mitigation setting.*/
 714                                 iowrite32(0x8b240000, ioaddr + CSR11);
 715                         } else if (tp->chip_id == LC82C168) {
 716                                 /* the LC82C168 doesn't have a hw timer.*/
 717                                 iowrite32(0x00, ioaddr + CSR7);
 718                                 mod_timer(&tp->timer, RUN_AT(HZ/50));
 719                         } else {
 720                           /* Mask all interrupting sources, set timer to
 721                                 re-enable. */
 722                                 iowrite32(((~csr5) & 0x0001ebef) | AbnormalIntr | TimerInt, ioaddr + CSR7);
 723                                 iowrite32(0x0012, ioaddr + CSR11);
 724                         }
 725                         break;
 726                 }
 727
 728                 work_count--;
 729                 if (work_count == 0)
 730                         break;
 731
 732                 csr5 = ioread32(ioaddr + CSR5);
 733
 734 #ifdef CONFIG_TULIP_NAPI
 735                 if (rxd)
 736                         csr5 &= ~RxPollInt;
 737         } while ((csr5 & (TxNoBuf |
 738                           TxDied |
 739                           TxIntr |
 740                           TimerInt |
 741                           /* Abnormal intr. */
 742                           RxDied |
 743                           TxFIFOUnderflow |
 744                           TxJabber |
 745                           TPLnkFail |
 746                           SystemError )) != 0);
 747 #else
 748         } while ((csr5 & (NormalIntr|AbnormalIntr)) != 0);
 749
 750         tulip_refill_rx(dev);
 751
 752         /* check if the card is in suspend mode */
 753         entry = tp->dirty_rx % RX_RING_SIZE;
 754         if (tp->rx_buffers[entry].skb == NULL) {
 755                 if (tulip_debug > 1)
 756                         printk(KERN_WARNING "%s: in rx suspend mode: (%lu) (tp->cur_rx = %u, ttimer = %d, rx = %d) go/stay in suspend mode\n", dev->name, tp->nir, tp->cur_rx, tp->ttimer, rx);
 757                 if (tp->chip_id == LC82C168) {
 758                         iowrite32(0x00, ioaddr + CSR7);
 759                         mod_timer(&tp->timer, RUN_AT(HZ/50));
 760                 } else {
 761                         if (tp->ttimer == 0 || (ioread32(ioaddr + CSR11) & 0xffff) == 0) {
 762                                 if (tulip_debug > 1)
 763                                         printk(KERN_WARNING "%s: in rx suspend mode: (%lu) set timer\n", dev->name, tp->nir);
 764                                 iowrite32(tulip_tbl[tp->chip_id].valid_intrs | TimerInt,
 765                                         ioaddr + CSR7);
 766                                 iowrite32(TimerInt, ioaddr + CSR5);
 767                                 iowrite32(12, ioaddr + CSR11);
 768                                 tp->ttimer = 1;
 769                         }
 770                 }
 771         }
 772 #endif /* CONFIG_TULIP_NAPI */
 773
 774         if ((missed = ioread32(ioaddr + CSR8) & 0x1ffff)) {
 775                 tp->stats.rx_dropped += missed & 0x10000 ? 0x10000 : missed;
 776         }
 777
 778         if (tulip_debug > 4)
 779                 printk(KERN_DEBUG "%s: exiting interrupt, csr5=%#4.4x.\n",
 780                            dev->name, ioread32(ioaddr + CSR5));
 781
 782         return IRQ_HANDLED;
 783 }