drivers/staging/et131x/et1310_rx.c

   1 /*
   2  * Agere Systems Inc.
   3  * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
   4  *
   5  * Copyright © 2005 Agere Systems Inc.
   6  * All rights reserved.
   7  *   http://www.agere.com
   8  *
   9  *------------------------------------------------------------------------------
  10  *
  11  * et1310_rx.c - Routines used to perform data reception
  12  *
  13  *------------------------------------------------------------------------------
  14  *
  15  * SOFTWARE LICENSE
  16  *
  17  * This software is provided subject to the following terms and conditions,
  18  * which you should read carefully before using the software.  Using this
  19  * software indicates your acceptance of these terms and conditions.  If you do
  20  * not agree with these terms and conditions, do not use the software.
  21  *
  22  * Copyright © 2005 Agere Systems Inc.
  23  * All rights reserved.
  24  *
  25  * Redistribution and use in source or binary forms, with or without
  26  * modifications, are permitted provided that the following conditions are met:
  27  *
  28  * . Redistributions of source code must retain the above copyright notice, this
  29  *    list of conditions and the following Disclaimer as comments in the code as
  30  *    well as in the documentation and/or other materials provided with the
  31  *    distribution.
  32  *
  33  * . Redistributions in binary form must reproduce the above copyright notice,
  34  *    this list of conditions and the following Disclaimer in the documentation
  35  *    and/or other materials provided with the distribution.
  36  *
  37  * . Neither the name of Agere Systems Inc. nor the names of the contributors
  38  *    may be used to endorse or promote products derived from this software
  39  *    without specific prior written permission.
  40  *
  41  * Disclaimer
  42  *
  43  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  44  * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
  45  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
  46  * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
  47  * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
  48  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  49  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  50  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  51  * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  53  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  54  * DAMAGE.
  55  *
  56  */
  57
  58 #include "et131x_version.h"
  59 #include "et131x_defs.h"
  60
  61 #include <linux/pci.h>
  62 #include <linux/init.h>
  63 #include <linux/module.h>
  64 #include <linux/types.h>
  65 #include <linux/kernel.h>
  66
  67 #include <linux/sched.h>
  68 #include <linux/ptrace.h>
  69 #include <linux/slab.h>
  70 #include <linux/ctype.h>
  71 #include <linux/string.h>
  72 #include <linux/timer.h>
  73 #include <linux/interrupt.h>
  74 #include <linux/in.h>
  75 #include <linux/delay.h>
  76 #include <linux/io.h>
  77 #include <linux/bitops.h>
  78 #include <asm/system.h>
  79
  80 #include <linux/netdevice.h>
  81 #include <linux/etherdevice.h>
  82 #include <linux/skbuff.h>
  83 #include <linux/if_arp.h>
  84 #include <linux/ioport.h>
  85
  86 #include "et1310_phy.h"
  87 #include "et1310_pm.h"
  88 #include "et1310_jagcore.h"
  89
  90 #include "et131x_adapter.h"
  91 #include "et131x_initpci.h"
  92
  93 #include "et1310_rx.h"
  94
  95
  96 void nic_return_rfd(struct et131x_adapter *etdev, PMP_RFD pMpRfd);
  97
  98 /**
  99  * et131x_rx_dma_memory_alloc
 100  * @adapter: pointer to our private adapter structure
 101  *
 102  * Returns 0 on success and errno on failure (as defined in errno.h)
 103  *
 104  * Allocates Free buffer ring 1 for sure, free buffer ring 0 if required,
 105  * and the Packet Status Ring.
 106  */
 107 int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
 108 {
 109         u32 i, j;
 110         u32 bufsize;
 111         u32 pktStatRingSize, FBRChunkSize;
 112         RX_RING_t *rx_ring;
 113
 114         /* Setup some convenience pointers */
 115         rx_ring = (RX_RING_t *) &adapter->RxRing;
 116
 117         /* Alloc memory for the lookup table */
 118 #ifdef USE_FBR0
 119         rx_ring->Fbr[0] = kmalloc(sizeof(FBRLOOKUPTABLE), GFP_KERNEL);
 120 #endif
 121
 122         rx_ring->Fbr[1] = kmalloc(sizeof(FBRLOOKUPTABLE), GFP_KERNEL);
 123
 124         /* The first thing we will do is configure the sizes of the buffer
 125          * rings. These will change based on jumbo packet support.  Larger
 126          * jumbo packets increases the size of each entry in FBR0, and the
 127          * number of entries in FBR0, while at the same time decreasing the
 128          * number of entries in FBR1.
 129          *
 130          * FBR1 holds "large" frames, FBR0 holds "small" frames.  If FBR1
 131          * entries are huge in order to accomodate a "jumbo" frame, then it
 132          * will have less entries.  Conversely, FBR1 will now be relied upon
 133          * to carry more "normal" frames, thus it's entry size also increases
 134          * and the number of entries goes up too (since it now carries
 135          * "small" + "regular" packets.
 136          *
 137          * In this scheme, we try to maintain 512 entries between the two
 138          * rings. Also, FBR1 remains a constant size - when it's size doubles
 139          * the number of entries halves.  FBR0 increases in size, however.
 140          */
 141
 142         if (adapter->RegistryJumboPacket < 2048) {
 143 #ifdef USE_FBR0
 144                 rx_ring->Fbr0BufferSize = 256;
 145                 rx_ring->Fbr0NumEntries = 512;
 146 #endif
 147                 rx_ring->Fbr1BufferSize = 2048;
 148                 rx_ring->Fbr1NumEntries = 512;
 149         } else if (adapter->RegistryJumboPacket < 4096) {
 150 #ifdef USE_FBR0
 151                 rx_ring->Fbr0BufferSize = 512;
 152                 rx_ring->Fbr0NumEntries = 1024;
 153 #endif
 154                 rx_ring->Fbr1BufferSize = 4096;
 155                 rx_ring->Fbr1NumEntries = 512;
 156         } else {
 157 #ifdef USE_FBR0
 158                 rx_ring->Fbr0BufferSize = 1024;
 159                 rx_ring->Fbr0NumEntries = 768;
 160 #endif
 161                 rx_ring->Fbr1BufferSize = 16384;
 162                 rx_ring->Fbr1NumEntries = 128;
 163         }
 164
 165 #ifdef USE_FBR0
 166         adapter->RxRing.PsrNumEntries = adapter->RxRing.Fbr0NumEntries +
 167             adapter->RxRing.Fbr1NumEntries;
 168 #else
 169         adapter->RxRing.PsrNumEntries = adapter->RxRing.Fbr1NumEntries;
 170 #endif
 171
 172         /* Allocate an area of memory for Free Buffer Ring 1 */
 173         bufsize = (sizeof(FBR_DESC_t) * rx_ring->Fbr1NumEntries) + 0xfff;
 174         rx_ring->pFbr1RingVa = pci_alloc_consistent(adapter->pdev,
 175                                                     bufsize,
 176                                                     &rx_ring->pFbr1RingPa);
 177         if (!rx_ring->pFbr1RingVa) {
 178                 dev_err(&adapter->pdev->dev,
 179                           "Cannot alloc memory for Free Buffer Ring 1\n");
 180                 return -ENOMEM;
 181         }
 182
 183         /* Save physical address
 184          *
 185          * NOTE: pci_alloc_consistent(), used above to alloc DMA regions,
 186          * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
 187          * are ever returned, make sure the high part is retrieved here
 188          * before storing the adjusted address.
 189          */
 190         rx_ring->Fbr1Realpa = rx_ring->pFbr1RingPa;
 191
 192         /* Align Free Buffer Ring 1 on a 4K boundary */
 193         et131x_align_allocated_memory(adapter,
 194                                       &rx_ring->Fbr1Realpa,
 195                                       &rx_ring->Fbr1offset, 0x0FFF);
 196
 197         rx_ring->pFbr1RingVa = (void *)((uint8_t *) rx_ring->pFbr1RingVa +
 198                                         rx_ring->Fbr1offset);
 199
 200 #ifdef USE_FBR0
 201         /* Allocate an area of memory for Free Buffer Ring 0 */
 202         bufsize = (sizeof(FBR_DESC_t) * rx_ring->Fbr0NumEntries) + 0xfff;
 203         rx_ring->pFbr0RingVa = pci_alloc_consistent(adapter->pdev,
 204                                                     bufsize,
 205                                                     &rx_ring->pFbr0RingPa);
 206         if (!rx_ring->pFbr0RingVa) {
 207                 dev_err(&adapter->pdev->dev,
 208                           "Cannot alloc memory for Free Buffer Ring 0\n");
 209                 return -ENOMEM;
 210         }
 211
 212         /* Save physical address
 213          *
 214          * NOTE: pci_alloc_consistent(), used above to alloc DMA regions,
 215          * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
 216          * are ever returned, make sure the high part is retrieved here before
 217          * storing the adjusted address.
 218          */
 219         rx_ring->Fbr0Realpa = rx_ring->pFbr0RingPa;
 220
 221         /* Align Free Buffer Ring 0 on a 4K boundary */
 222         et131x_align_allocated_memory(adapter,
 223                                       &rx_ring->Fbr0Realpa,
 224                                       &rx_ring->Fbr0offset, 0x0FFF);
 225
 226         rx_ring->pFbr0RingVa = (void *)((uint8_t *) rx_ring->pFbr0RingVa +
 227                                         rx_ring->Fbr0offset);
 228 #endif
 229
 230         for (i = 0; i < (rx_ring->Fbr1NumEntries / FBR_CHUNKS);
 231              i++) {
 232                 u64 Fbr1Offset;
 233                 u64 Fbr1TempPa;
 234                 u32 Fbr1Align;
 235
 236                 /* This code allocates an area of memory big enough for N
 237                  * free buffers + (buffer_size - 1) so that the buffers can
 238                  * be aligned on 4k boundaries.  If each buffer were aligned
 239                  * to a buffer_size boundary, the effect would be to double
 240                  * the size of FBR0.  By allocating N buffers at once, we
 241                  * reduce this overhead.
 242                  */
 243                 if (rx_ring->Fbr1BufferSize > 4096)
 244                         Fbr1Align = 4096;
 245                 else
 246                         Fbr1Align = rx_ring->Fbr1BufferSize;
 247
 248                 FBRChunkSize =
 249                     (FBR_CHUNKS * rx_ring->Fbr1BufferSize) + Fbr1Align - 1;
 250                 rx_ring->Fbr1MemVa[i] =
 251                     pci_alloc_consistent(adapter->pdev, FBRChunkSize,
 252                                          &rx_ring->Fbr1MemPa[i]);
 253
 254                 if (!rx_ring->Fbr1MemVa[i]) {
 255                 dev_err(&adapter->pdev->dev,
 256                                 "Could not alloc memory\n");
 257                         return -ENOMEM;
 258                 }
 259
 260                 /* See NOTE in "Save Physical Address" comment above */
 261                 Fbr1TempPa = rx_ring->Fbr1MemPa[i];
 262
 263                 et131x_align_allocated_memory(adapter,
 264                                               &Fbr1TempPa,
 265                                               &Fbr1Offset, (Fbr1Align - 1));
 266
 267                 for (j = 0; j < FBR_CHUNKS; j++) {
 268                         u32 index = (i * FBR_CHUNKS) + j;
 269
 270                         /* Save the Virtual address of this index for quick
 271                          * access later
 272                          */
 273                         rx_ring->Fbr[1]->Va[index] =
 274                             (uint8_t *) rx_ring->Fbr1MemVa[i] +
 275                             (j * rx_ring->Fbr1BufferSize) + Fbr1Offset;
 276
 277                         /* now store the physical address in the descriptor
 278                          * so the device can access it
 279                          */
 280                         rx_ring->Fbr[1]->PAHigh[index] =
 281                             (u32) (Fbr1TempPa >> 32);
 282                         rx_ring->Fbr[1]->PALow[index] = (u32) Fbr1TempPa;
 283
 284                         Fbr1TempPa += rx_ring->Fbr1BufferSize;
 285
 286                         rx_ring->Fbr[1]->Buffer1[index] =
 287                             rx_ring->Fbr[1]->Va[index];
 288                         rx_ring->Fbr[1]->Buffer2[index] =
 289                             rx_ring->Fbr[1]->Va[index] - 4;
 290                 }
 291         }
 292
 293 #ifdef USE_FBR0
 294         /* Same for FBR0 (if in use) */
 295         for (i = 0; i < (rx_ring->Fbr0NumEntries / FBR_CHUNKS);
 296              i++) {
 297                 u64 Fbr0Offset;
 298                 u64 Fbr0TempPa;
 299
 300                 FBRChunkSize = ((FBR_CHUNKS + 1) * rx_ring->Fbr0BufferSize) - 1;
 301                 rx_ring->Fbr0MemVa[i] =
 302                     pci_alloc_consistent(adapter->pdev, FBRChunkSize,
 303                                          &rx_ring->Fbr0MemPa[i]);
 304
 305                 if (!rx_ring->Fbr0MemVa[i]) {
 306                         dev_err(&adapter->pdev->dev,
 307                                 "Could not alloc memory\n");
 308                         return -ENOMEM;
 309                 }
 310
 311                 /* See NOTE in "Save Physical Address" comment above */
 312                 Fbr0TempPa = rx_ring->Fbr0MemPa[i];
 313
 314                 et131x_align_allocated_memory(adapter,
 315                                               &Fbr0TempPa,
 316                                               &Fbr0Offset,
 317                                               rx_ring->Fbr0BufferSize - 1);
 318
 319                 for (j = 0; j < FBR_CHUNKS; j++) {
 320                         u32 index = (i * FBR_CHUNKS) + j;
 321
 322                         rx_ring->Fbr[0]->Va[index] =
 323                             (uint8_t *) rx_ring->Fbr0MemVa[i] +
 324                             (j * rx_ring->Fbr0BufferSize) + Fbr0Offset;
 325
 326                         rx_ring->Fbr[0]->PAHigh[index] =
 327                             (u32) (Fbr0TempPa >> 32);
 328                         rx_ring->Fbr[0]->PALow[index] = (u32) Fbr0TempPa;
 329
 330                         Fbr0TempPa += rx_ring->Fbr0BufferSize;
 331
 332                         rx_ring->Fbr[0]->Buffer1[index] =
 333                             rx_ring->Fbr[0]->Va[index];
 334                         rx_ring->Fbr[0]->Buffer2[index] =
 335                             rx_ring->Fbr[0]->Va[index] - 4;
 336                 }
 337         }
 338 #endif
 339
 340         /* Allocate an area of memory for FIFO of Packet Status ring entries */
 341         pktStatRingSize =
 342             sizeof(PKT_STAT_DESC_t) * adapter->RxRing.PsrNumEntries;
 343
 344         rx_ring->pPSRingVa = pci_alloc_consistent(adapter->pdev,
 345                                                   pktStatRingSize,
 346                                                   &rx_ring->pPSRingPa);
 347
 348         if (!rx_ring->pPSRingVa) {
 349                 dev_err(&adapter->pdev->dev,
 350                           "Cannot alloc memory for Packet Status Ring\n");
 351                 return -ENOMEM;
 352         }
 353         printk("PSR %lx\n", (unsigned long) rx_ring->pPSRingPa);
 354
 355         /*
 356          * NOTE : pci_alloc_consistent(), used above to alloc DMA regions,
 357          * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
 358          * are ever returned, make sure the high part is retrieved here before
 359          * storing the adjusted address.
 360          */
 361
 362         /* Allocate an area of memory for writeback of status information */
 363         rx_ring->pRxStatusVa = pci_alloc_consistent(adapter->pdev,
 364                                                     sizeof(RX_STATUS_BLOCK_t),
 365                                                     &rx_ring->pRxStatusPa);
 366         if (!rx_ring->pRxStatusVa) {
 367                 dev_err(&adapter->pdev->dev,
 368                           "Cannot alloc memory for Status Block\n");
 369                 return -ENOMEM;
 370         }
 371         rx_ring->NumRfd = NIC_DEFAULT_NUM_RFD;
 372         printk("PRS %lx\n", (unsigned long)rx_ring->pRxStatusPa);
 373
 374         /* Recv
 375          * pci_pool_create initializes a lookaside list. After successful
 376          * creation, nonpaged fixed-size blocks can be allocated from and
 377          * freed to the lookaside list.
 378          * RFDs will be allocated from this pool.
 379          */
 380         rx_ring->RecvLookaside = kmem_cache_create(adapter->netdev->name,
 381                                                    sizeof(MP_RFD),
 382                                                    0,
 383                                                    SLAB_CACHE_DMA |
 384                                                    SLAB_HWCACHE_ALIGN,
 385                                                    NULL);
 386
 387         adapter->Flags |= fMP_ADAPTER_RECV_LOOKASIDE;
 388
 389         /* The RFDs are going to be put on lists later on, so initialize the
 390          * lists now.
 391          */
 392         INIT_LIST_HEAD(&rx_ring->RecvList);
 393         INIT_LIST_HEAD(&rx_ring->RecvPendingList);
 394         return 0;
 395 }
 396
 397 /**
 398  * et131x_rx_dma_memory_free - Free all memory allocated within this module.
 399  * @adapter: pointer to our private adapter structure
 400  */
 401 void et131x_rx_dma_memory_free(struct et131x_adapter *adapter)
 402 {
 403         u32 index;
 404         u32 bufsize;
 405         u32 pktStatRingSize;
 406         PMP_RFD rfd;
 407         RX_RING_t *rx_ring;
 408
 409         /* Setup some convenience pointers */
 410         rx_ring = (RX_RING_t *) &adapter->RxRing;
 411
 412         /* Free RFDs and associated packet descriptors */
 413         WARN_ON(rx_ring->nReadyRecv != rx_ring->NumRfd);
 414
 415         while (!list_empty(&rx_ring->RecvList)) {
 416                 rfd = (MP_RFD *) list_entry(rx_ring->RecvList.next,
 417                                                MP_RFD, list_node);
 418
 419                 list_del(&rfd->list_node);
 420                 et131x_rfd_resources_free(adapter, rfd);
 421         }
 422
 423         while (!list_empty(&rx_ring->RecvPendingList)) {
 424                 rfd = (MP_RFD *) list_entry(rx_ring->RecvPendingList.next,
 425                                                MP_RFD, list_node);
 426                 list_del(&rfd->list_node);
 427                 et131x_rfd_resources_free(adapter, rfd);
 428         }
 429
 430         /* Free Free Buffer Ring 1 */
 431         if (rx_ring->pFbr1RingVa) {
 432                 /* First the packet memory */
 433                 for (index = 0; index <
 434                      (rx_ring->Fbr1NumEntries / FBR_CHUNKS); index++) {
 435                         if (rx_ring->Fbr1MemVa[index]) {
 436                                 u32 Fbr1Align;
 437
 438                                 if (rx_ring->Fbr1BufferSize > 4096)
 439                                         Fbr1Align = 4096;
 440                                 else
 441                                         Fbr1Align = rx_ring->Fbr1BufferSize;
 442
 443                                 bufsize =
 444                                     (rx_ring->Fbr1BufferSize * FBR_CHUNKS) +
 445                                     Fbr1Align - 1;
 446
 447                                 pci_free_consistent(adapter->pdev,
 448                                                     bufsize,
 449                                                     rx_ring->Fbr1MemVa[index],
 450                                                     rx_ring->Fbr1MemPa[index]);
 451
 452                                 rx_ring->Fbr1MemVa[index] = NULL;
 453                         }
 454                 }
 455
 456                 /* Now the FIFO itself */
 457                 rx_ring->pFbr1RingVa = (void *)((uint8_t *)
 458                                 rx_ring->pFbr1RingVa - rx_ring->Fbr1offset);
 459
 460                 bufsize =
 461                     (sizeof(FBR_DESC_t) * rx_ring->Fbr1NumEntries) + 0xfff;
 462
 463                 pci_free_consistent(adapter->pdev,
 464                                     bufsize,
 465                                     rx_ring->pFbr1RingVa, rx_ring->pFbr1RingPa);
 466
 467                 rx_ring->pFbr1RingVa = NULL;
 468         }
 469
 470 #ifdef USE_FBR0
 471         /* Now the same for Free Buffer Ring 0 */
 472         if (rx_ring->pFbr0RingVa) {
 473                 /* First the packet memory */
 474                 for (index = 0; index <
 475                      (rx_ring->Fbr0NumEntries / FBR_CHUNKS); index++) {
 476                         if (rx_ring->Fbr0MemVa[index]) {
 477                                 bufsize =
 478                                     (rx_ring->Fbr0BufferSize *
 479                                      (FBR_CHUNKS + 1)) - 1;
 480
 481                                 pci_free_consistent(adapter->pdev,
 482                                                     bufsize,
 483                                                     rx_ring->Fbr0MemVa[index],
 484                                                     rx_ring->Fbr0MemPa[index]);
 485
 486                                 rx_ring->Fbr0MemVa[index] = NULL;
 487                         }
 488                 }
 489
 490                 /* Now the FIFO itself */
 491                 rx_ring->pFbr0RingVa = (void *)((uint8_t *)
 492                                 rx_ring->pFbr0RingVa - rx_ring->Fbr0offset);
 493
 494                 bufsize =
 495                     (sizeof(FBR_DESC_t) * rx_ring->Fbr0NumEntries) + 0xfff;
 496
 497                 pci_free_consistent(adapter->pdev,
 498                                     bufsize,
 499                                     rx_ring->pFbr0RingVa, rx_ring->pFbr0RingPa);
 500
 501                 rx_ring->pFbr0RingVa = NULL;
 502         }
 503 #endif
 504
 505         /* Free Packet Status Ring */
 506         if (rx_ring->pPSRingVa) {
 507                 pktStatRingSize =
 508                     sizeof(PKT_STAT_DESC_t) * adapter->RxRing.PsrNumEntries;
 509
 510                 pci_free_consistent(adapter->pdev, pktStatRingSize,
 511                                     rx_ring->pPSRingVa, rx_ring->pPSRingPa);
 512
 513                 rx_ring->pPSRingVa = NULL;
 514         }
 515
 516         /* Free area of memory for the writeback of status information */
 517         if (rx_ring->pRxStatusVa) {
 518                 pci_free_consistent(adapter->pdev,
 519                                 sizeof(RX_STATUS_BLOCK_t),
 520                                 rx_ring->pRxStatusVa, rx_ring->pRxStatusPa);
 521
 522                 rx_ring->pRxStatusVa = NULL;
 523         }
 524
 525         /* Free receive buffer pool */
 526
 527         /* Free receive packet pool */
 528
 529         /* Destroy the lookaside (RFD) pool */
 530         if (adapter->Flags & fMP_ADAPTER_RECV_LOOKASIDE) {
 531                 kmem_cache_destroy(rx_ring->RecvLookaside);
 532                 adapter->Flags &= ~fMP_ADAPTER_RECV_LOOKASIDE;
 533         }
 534
 535         /* Free the FBR Lookup Table */
 536 #ifdef USE_FBR0
 537         kfree(rx_ring->Fbr[0]);
 538 #endif
 539
 540         kfree(rx_ring->Fbr[1]);
 541
 542         /* Reset Counters */
 543         rx_ring->nReadyRecv = 0;
 544 }
 545
 546 /**
 547  * et131x_init_recv - Initialize receive data structures.
 548  * @adapter: pointer to our private adapter structure
 549  *
 550  * Returns 0 on success and errno on failure (as defined in errno.h)
 551  */
 552 int et131x_init_recv(struct et131x_adapter *adapter)
 553 {
 554         int status = -ENOMEM;
 555         PMP_RFD rfd = NULL;
 556         u32 rfdct;
 557         u32 numrfd = 0;
 558         RX_RING_t *rx_ring = NULL;
 559
 560         /* Setup some convenience pointers */
 561         rx_ring = (RX_RING_t *) &adapter->RxRing;
 562
 563         /* Setup each RFD */
 564         for (rfdct = 0; rfdct < rx_ring->NumRfd; rfdct++) {
 565                 rfd = (MP_RFD *) kmem_cache_alloc(rx_ring->RecvLookaside,
 566                                                      GFP_ATOMIC | GFP_DMA);
 567
 568                 if (!rfd) {
 569                         dev_err(&adapter->pdev->dev,
 570                                   "Couldn't alloc RFD out of kmem_cache\n");
 571                         status = -ENOMEM;
 572                         continue;
 573                 }
 574
 575                 status = et131x_rfd_resources_alloc(adapter, rfd);
 576                 if (status != 0) {
 577                         dev_err(&adapter->pdev->dev,
 578                                   "Couldn't alloc packet for RFD\n");
 579                         kmem_cache_free(rx_ring->RecvLookaside, rfd);
 580                         continue;
 581                 }
 582
 583                 /* Add this RFD to the RecvList */
 584                 list_add_tail(&rfd->list_node, &rx_ring->RecvList);
 585
 586                 /* Increment both the available RFD's, and the total RFD's. */
 587                 rx_ring->nReadyRecv++;
 588                 numrfd++;
 589         }
 590
 591         if (numrfd > NIC_MIN_NUM_RFD)
 592                 status = 0;
 593
 594         rx_ring->NumRfd = numrfd;
 595
 596         if (status != 0) {
 597                 kmem_cache_free(rx_ring->RecvLookaside, rfd);
 598                 dev_err(&adapter->pdev->dev,
 599                           "Allocation problems in et131x_init_recv\n");
 600         }
 601         return status;
 602 }
 603
 604 /**
 605  * et131x_rfd_resources_alloc
 606  * @adapter: pointer to our private adapter structure
 607  * @rfd: pointer to a RFD
 608  *
 609  * Returns 0 on success and errno on failure (as defined in errno.h)
 610  */
 611 int et131x_rfd_resources_alloc(struct et131x_adapter *adapter, MP_RFD *rfd)
 612 {
 613         rfd->Packet = NULL;
 614
 615         return 0;
 616 }
 617
 618 /**
 619  * et131x_rfd_resources_free - Free the packet allocated for the given RFD
 620  * @adapter: pointer to our private adapter structure
 621  * @rfd: pointer to a RFD
 622  */
 623 void et131x_rfd_resources_free(struct et131x_adapter *adapter, MP_RFD *rfd)
 624 {
 625         rfd->Packet = NULL;
 626         kmem_cache_free(adapter->RxRing.RecvLookaside, rfd);
 627 }
 628
 629 /**
 630  * ConfigRxDmaRegs - Start of Rx_DMA init sequence
 631  * @etdev: pointer to our adapter structure
 632  */
 633 void ConfigRxDmaRegs(struct et131x_adapter *etdev)
 634 {
 635         struct _RXDMA_t __iomem *rx_dma = &etdev->regs->rxdma;
 636         struct _rx_ring_t *rx_local = &etdev->RxRing;
 637         PFBR_DESC_t fbr_entry;
 638         u32 entry;
 639         RXDMA_PSR_NUM_DES_t psr_num_des;
 640         unsigned long flags;
 641
 642         /* Halt RXDMA to perform the reconfigure.  */
 643         et131x_rx_dma_disable(etdev);
 644
 645         /* Load the completion writeback physical address
 646          *
 647          * NOTE : pci_alloc_consistent(), used above to alloc DMA regions,
 648          * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
 649          * are ever returned, make sure the high part is retrieved here
 650          * before storing the adjusted address.
 651          */
 652         writel((u32) ((u64)rx_local->pRxStatusPa >> 32),
 653                &rx_dma->dma_wb_base_hi);
 654         writel((u32) rx_local->pRxStatusPa, &rx_dma->dma_wb_base_lo);
 655
 656         memset(rx_local->pRxStatusVa, 0, sizeof(RX_STATUS_BLOCK_t));
 657
 658         /* Set the address and parameters of the packet status ring into the
 659          * 1310's registers
 660          */
 661         writel((u32) ((u64)rx_local->pPSRingPa >> 32),
 662                &rx_dma->psr_base_hi);
 663         writel((u32) rx_local->pPSRingPa, &rx_dma->psr_base_lo);
 664         writel(rx_local->PsrNumEntries - 1, &rx_dma->psr_num_des.value);
 665         writel(0, &rx_dma->psr_full_offset.value);
 666
 667         psr_num_des.value = readl(&rx_dma->psr_num_des.value);
 668         writel((psr_num_des.bits.psr_ndes * LO_MARK_PERCENT_FOR_PSR) / 100,
 669                &rx_dma->psr_min_des.value);
 670
 671         spin_lock_irqsave(&etdev->RcvLock, flags);
 672
 673         /* These local variables track the PSR in the adapter structure */
 674         rx_local->local_psr_full.bits.psr_full = 0;
 675         rx_local->local_psr_full.bits.psr_full_wrap = 0;
 676
 677         /* Now's the best time to initialize FBR1 contents */
 678         fbr_entry = (PFBR_DESC_t) rx_local->pFbr1RingVa;
 679         for (entry = 0; entry < rx_local->Fbr1NumEntries; entry++) {
 680                 fbr_entry->addr_hi = rx_local->Fbr[1]->PAHigh[entry];
 681                 fbr_entry->addr_lo = rx_local->Fbr[1]->PALow[entry];
 682                 fbr_entry->word2.bits.bi = entry;
 683                 fbr_entry++;
 684         }
 685
 686         /* Set the address and parameters of Free buffer ring 1 (and 0 if
 687          * required) into the 1310's registers
 688          */
 689         writel((u32) (rx_local->Fbr1Realpa >> 32), &rx_dma->fbr1_base_hi);
 690         writel((u32) rx_local->Fbr1Realpa, &rx_dma->fbr1_base_lo);
 691         writel(rx_local->Fbr1NumEntries - 1, &rx_dma->fbr1_num_des.value);
 692         writel(ET_DMA10_WRAP, &rx_dma->fbr1_full_offset);
 693
 694         /* This variable tracks the free buffer ring 1 full position, so it
 695          * has to match the above.
 696          */
 697         rx_local->local_Fbr1_full = ET_DMA10_WRAP;
 698         writel(((rx_local->Fbr1NumEntries * LO_MARK_PERCENT_FOR_RX) / 100) - 1,
 699                &rx_dma->fbr1_min_des.value);
 700
 701 #ifdef USE_FBR0
 702         /* Now's the best time to initialize FBR0 contents */
 703         fbr_entry = (PFBR_DESC_t) rx_local->pFbr0RingVa;
 704         for (entry = 0; entry < rx_local->Fbr0NumEntries; entry++) {
 705                 fbr_entry->addr_hi = rx_local->Fbr[0]->PAHigh[entry];
 706                 fbr_entry->addr_lo = rx_local->Fbr[0]->PALow[entry];
 707                 fbr_entry->word2.bits.bi = entry;
 708                 fbr_entry++;
 709         }
 710
 711         writel((u32) (rx_local->Fbr0Realpa >> 32), &rx_dma->fbr0_base_hi);
 712         writel((u32) rx_local->Fbr0Realpa, &rx_dma->fbr0_base_lo);
 713         writel(rx_local->Fbr0NumEntries - 1, &rx_dma->fbr0_num_des.value);
 714         writel(ET_DMA10_WRAP, &rx_dma->fbr0_full_offset);
 715
 716         /* This variable tracks the free buffer ring 0 full position, so it
 717          * has to match the above.
 718          */
 719         rx_local->local_Fbr0_full = ET_DMA10_WRAP;
 720         writel(((rx_local->Fbr0NumEntries * LO_MARK_PERCENT_FOR_RX) / 100) - 1,
 721                &rx_dma->fbr0_min_des.value);
 722 #endif
 723
 724         /* Program the number of packets we will receive before generating an
 725          * interrupt.
 726          * For version B silicon, this value gets updated once autoneg is
 727          *complete.
 728          */
 729         writel(PARM_RX_NUM_BUFS_DEF, &rx_dma->num_pkt_done.value);
 730
 731         /* The "time_done" is not working correctly to coalesce interrupts
 732          * after a given time period, but rather is giving us an interrupt
 733          * regardless of whether we have received packets.
 734          * This value gets updated once autoneg is complete.
 735          */
 736         writel(PARM_RX_TIME_INT_DEF, &rx_dma->max_pkt_time.value);
 737
 738         spin_unlock_irqrestore(&etdev->RcvLock, flags);
 739 }
 740
 741 /**
 742  * SetRxDmaTimer - Set the heartbeat timer according to line rate.
 743  * @etdev: pointer to our adapter structure
 744  */
 745 void SetRxDmaTimer(struct et131x_adapter *etdev)
 746 {
 747         /* For version B silicon, we do not use the RxDMA timer for 10 and 100
 748          * Mbits/s line rates. We do not enable and RxDMA interrupt coalescing.
 749          */
 750         if ((etdev->linkspeed == TRUEPHY_SPEED_100MBPS) ||
 751             (etdev->linkspeed == TRUEPHY_SPEED_10MBPS)) {
 752                 writel(0, &etdev->regs->rxdma.max_pkt_time.value);
 753                 writel(1, &etdev->regs->rxdma.num_pkt_done.value);
 754         }
 755 }
 756
 757 /**
 758  * et131x_rx_dma_disable - Stop of Rx_DMA on the ET1310
 759  * @etdev: pointer to our adapter structure
 760  */
 761 void et131x_rx_dma_disable(struct et131x_adapter *etdev)
 762 {
 763         RXDMA_CSR_t csr;
 764
 765         /* Setup the receive dma configuration register */
 766         writel(0x00002001, &etdev->regs->rxdma.csr.value);
 767         csr.value = readl(&etdev->regs->rxdma.csr.value);
 768         if (csr.bits.halt_status != 1) {
 769                 udelay(5);
 770                 csr.value = readl(&etdev->regs->rxdma.csr.value);
 771                 if (csr.bits.halt_status != 1)
 772                         dev_err(&etdev->pdev->dev,
 773                                 "RX Dma failed to enter halt state. CSR 0x%08x\n",
 774                                 csr.value);
 775         }
 776 }
 777
 778 /**
 779  * et131x_rx_dma_enable - re-start of Rx_DMA on the ET1310.
 780  * @etdev: pointer to our adapter structure
 781  */
 782 void et131x_rx_dma_enable(struct et131x_adapter *etdev)
 783 {
 784         /* Setup the receive dma configuration register for normal operation */
 785         RXDMA_CSR_t csr = { 0 };
 786
 787         csr.bits.fbr1_enable = 1;
 788         if (etdev->RxRing.Fbr1BufferSize == 4096)
 789                 csr.bits.fbr1_size = 1;
 790         else if (etdev->RxRing.Fbr1BufferSize == 8192)
 791                 csr.bits.fbr1_size = 2;
 792         else if (etdev->RxRing.Fbr1BufferSize == 16384)
 793                 csr.bits.fbr1_size = 3;
 794 #ifdef USE_FBR0
 795         csr.bits.fbr0_enable = 1;
 796         if (etdev->RxRing.Fbr0BufferSize == 256)
 797                 csr.bits.fbr0_size = 1;
 798         else if (etdev->RxRing.Fbr0BufferSize == 512)
 799                 csr.bits.fbr0_size = 2;
 800         else if (etdev->RxRing.Fbr0BufferSize == 1024)
 801                 csr.bits.fbr0_size = 3;
 802 #endif
 803         writel(csr.value, &etdev->regs->rxdma.csr.value);
 804
 805         csr.value = readl(&etdev->regs->rxdma.csr.value);
 806         if (csr.bits.halt_status != 0) {
 807                 udelay(5);
 808                 csr.value = readl(&etdev->regs->rxdma.csr.value);
 809                 if (csr.bits.halt_status != 0) {
 810                         dev_err(&etdev->pdev->dev,
 811                             "RX Dma failed to exit halt state.  CSR 0x%08x\n",
 812                                 csr.value);
 813                 }
 814         }
 815 }
 816
 817 /**
 818  * nic_rx_pkts - Checks the hardware for available packets
 819  * @etdev: pointer to our adapter
 820  *
 821  * Returns rfd, a pointer to our MPRFD.
 822  *
 823  * Checks the hardware for available packets, using completion ring
 824  * If packets are available, it gets an RFD from the RecvList, attaches
 825  * the packet to it, puts the RFD in the RecvPendList, and also returns
 826  * the pointer to the RFD.
 827  */
 828 PMP_RFD nic_rx_pkts(struct et131x_adapter *etdev)
 829 {
 830         struct _rx_ring_t *rx_local = &etdev->RxRing;
 831         PRX_STATUS_BLOCK_t status;
 832         PPKT_STAT_DESC_t psr;
 833         PMP_RFD rfd;
 834         u32 i;
 835         uint8_t *buf;
 836         unsigned long flags;
 837         struct list_head *element;
 838         uint8_t rindex;
 839         uint16_t bindex;
 840         u32 len;
 841         PKT_STAT_DESC_WORD0_t Word0;
 842
 843         /* RX Status block is written by the DMA engine prior to every
 844          * interrupt. It contains the next to be used entry in the Packet
 845          * Status Ring, and also the two Free Buffer rings.
 846          */
 847         status = (PRX_STATUS_BLOCK_t) rx_local->pRxStatusVa;
 848
 849         if (status->Word1.bits.PSRoffset ==
 850                         rx_local->local_psr_full.bits.psr_full &&
 851                         status->Word1.bits.PSRwrap ==
 852                         rx_local->local_psr_full.bits.psr_full_wrap) {
 853                 /* Looks like this ring is not updated yet */
 854                 return NULL;
 855         }
 856
 857         /* The packet status ring indicates that data is available. */
 858         psr = (PPKT_STAT_DESC_t) (rx_local->pPSRingVa) +
 859                         rx_local->local_psr_full.bits.psr_full;
 860
 861         /* Grab any information that is required once the PSR is
 862          * advanced, since we can no longer rely on the memory being
 863          * accurate
 864          */
 865         len = psr->word1.bits.length;
 866         rindex = (uint8_t) psr->word1.bits.ri;
 867         bindex = (uint16_t) psr->word1.bits.bi;
 868         Word0 = psr->word0;
 869
 870         /* Indicate that we have used this PSR entry. */
 871         if (++rx_local->local_psr_full.bits.psr_full >
 872             rx_local->PsrNumEntries - 1) {
 873                 rx_local->local_psr_full.bits.psr_full = 0;
 874                 rx_local->local_psr_full.bits.psr_full_wrap ^= 1;
 875         }
 876
 877         writel(rx_local->local_psr_full.value,
 878                &etdev->regs->rxdma.psr_full_offset.value);
 879
 880 #ifndef USE_FBR0
 881         if (rindex != 1) {
 882                 return NULL;
 883         }
 884 #endif
 885
 886 #ifdef USE_FBR0
 887         if (rindex > 1 ||
 888                 (rindex == 0 &&
 889                 bindex > rx_local->Fbr0NumEntries - 1) ||
 890                 (rindex == 1 &&
 891                 bindex > rx_local->Fbr1NumEntries - 1))
 892 #else
 893         if (rindex != 1 ||
 894                 bindex > rx_local->Fbr1NumEntries - 1)
 895 #endif
 896         {
 897                 /* Illegal buffer or ring index cannot be used by S/W*/
 898                 dev_err(&etdev->pdev->dev,
 899                           "NICRxPkts PSR Entry %d indicates "
 900                           "length of %d and/or bad bi(%d)\n",
 901                           rx_local->local_psr_full.bits.psr_full,
 902                           len, bindex);
 903                 return NULL;
 904         }
 905
 906         /* Get and fill the RFD. */
 907         spin_lock_irqsave(&etdev->RcvLock, flags);
 908
 909         rfd = NULL;
 910         element = rx_local->RecvList.next;
 911         rfd = (PMP_RFD) list_entry(element, MP_RFD, list_node);
 912
 913         if (rfd == NULL) {
 914                 spin_unlock_irqrestore(&etdev->RcvLock, flags);
 915                 return NULL;
 916         }
 917
 918         list_del(&rfd->list_node);
 919         rx_local->nReadyRecv--;
 920
 921         spin_unlock_irqrestore(&etdev->RcvLock, flags);
 922
 923         rfd->bufferindex = bindex;
 924         rfd->ringindex = rindex;
 925
 926         /* In V1 silicon, there is a bug which screws up filtering of
 927          * runt packets.  Therefore runt packet filtering is disabled
 928          * in the MAC and the packets are dropped here.  They are
 929          * also counted here.
 930          */
 931         if (len < (NIC_MIN_PACKET_SIZE + 4)) {
 932                 etdev->Stats.other_errors++;
 933                 len = 0;
 934         }
 935
 936         if (len) {
 937                 if (etdev->ReplicaPhyLoopbk == 1) {
 938                         buf = rx_local->Fbr[rindex]->Va[bindex];
 939
 940                         if (memcmp(&buf[6], &etdev->CurrentAddress[0],
 941                                    ETH_ALEN) == 0) {
 942                                 if (memcmp(&buf[42], "Replica packet",
 943                                            ETH_HLEN)) {
 944                                         etdev->ReplicaPhyLoopbkPF = 1;
 945                                 }
 946                         }
 947                 }
 948
 949                 /* Determine if this is a multicast packet coming in */
 950                 if ((Word0.value & ALCATEL_MULTICAST_PKT) &&
 951                     !(Word0.value & ALCATEL_BROADCAST_PKT)) {
 952                         /* Promiscuous mode and Multicast mode are
 953                          * not mutually exclusive as was first
 954                          * thought.  I guess Promiscuous is just
 955                          * considered a super-set of the other
 956                          * filters. Generally filter is 0x2b when in
 957                          * promiscuous mode.
 958                          */
 959                         if ((etdev->PacketFilter & ET131X_PACKET_TYPE_MULTICAST)
 960                             && !(etdev->PacketFilter & ET131X_PACKET_TYPE_PROMISCUOUS)
 961                             && !(etdev->PacketFilter & ET131X_PACKET_TYPE_ALL_MULTICAST)) {
 962                                 buf = rx_local->Fbr[rindex]->
 963                                                 Va[bindex];
 964
 965                                 /* Loop through our list to see if the
 966                                  * destination address of this packet
 967                                  * matches one in our list.
 968                                  */
 969                                 for (i = 0;
 970                                      i < etdev->MCAddressCount;
 971                                      i++) {
 972                                         if (buf[0] ==
 973                                             etdev->MCList[i][0]
 974                                             && buf[1] ==
 975                                             etdev->MCList[i][1]
 976                                             && buf[2] ==
 977                                             etdev->MCList[i][2]
 978                                             && buf[3] ==
 979                                             etdev->MCList[i][3]
 980                                             && buf[4] ==
 981                                             etdev->MCList[i][4]
 982                                             && buf[5] ==
 983                                             etdev->MCList[i][5]) {
 984                                                 break;
 985                                         }
 986                                 }
 987
 988                                 /* If our index is equal to the number
 989                                  * of Multicast address we have, then
 990                                  * this means we did not find this
 991                                  * packet's matching address in our
 992                                  * list.  Set the PacketSize to zero,
 993                                  * so we free our RFD when we return
 994                                  * from this function.
 995                                  */
 996                                 if (i == etdev->MCAddressCount)
 997                                         len = 0;
 998                         }
 999
1000                         if (len > 0)
1001                                 etdev->Stats.multircv++;
1002                 } else if (Word0.value & ALCATEL_BROADCAST_PKT)
1003                         etdev->Stats.brdcstrcv++;
1004                 else
1005                         /* Not sure what this counter measures in
1006                          * promiscuous mode. Perhaps we should check
1007                          * the MAC address to see if it is directed
1008                          * to us in promiscuous mode.
1009                          */
1010                         etdev->Stats.unircv++;
1011         }
1012
1013         if (len > 0) {
1014                 struct sk_buff *skb = NULL;
1015
1016                 /* rfd->PacketSize = len - 4; */
1017                 rfd->PacketSize = len;
1018
1019                 skb = dev_alloc_skb(rfd->PacketSize + 2);
1020                 if (!skb) {
1021                         dev_err(&etdev->pdev->dev,
1022                                   "Couldn't alloc an SKB for Rx\n");
1023                         return NULL;
1024                 }
1025
1026                 etdev->net_stats.rx_bytes += rfd->PacketSize;
1027
1028                 memcpy(skb_put(skb, rfd->PacketSize),
1029                        rx_local->Fbr[rindex]->Va[bindex],
1030                        rfd->PacketSize);
1031
1032                 skb->dev = etdev->netdev;
1033                 skb->protocol = eth_type_trans(skb, etdev->netdev);
1034                 skb->ip_summed = CHECKSUM_NONE;
1035
1036                 netif_rx(skb);
1037         } else {
1038                 rfd->PacketSize = 0;
1039         }
1040
1041         nic_return_rfd(etdev, rfd);
1042         return rfd;
1043 }
1044
1045 /**
1046  * et131x_reset_recv - Reset the receive list
1047  * @etdev: pointer to our adapter
1048  *
1049  * Assumption, Rcv spinlock has been acquired.
1050  */
1051 void et131x_reset_recv(struct et131x_adapter *etdev)
1052 {
1053         PMP_RFD rfd;
1054         struct list_head *element;
1055
1056         WARN_ON(list_empty(&etdev->RxRing.RecvList));
1057
1058         /* Take all the RFD's from the pending list, and stick them on the
1059          * RecvList.
1060          */
1061         while (!list_empty(&etdev->RxRing.RecvPendingList)) {
1062                 element = etdev->RxRing.RecvPendingList.next;
1063
1064                 rfd = (PMP_RFD) list_entry(element, MP_RFD, list_node);
1065
1066                 list_move_tail(&rfd->list_node, &etdev->RxRing.RecvList);
1067         }
1068 }
1069
1070 /**
1071  * et131x_handle_recv_interrupt - Interrupt handler for receive processing
1072  * @etdev: pointer to our adapter
1073  *
1074  * Assumption, Rcv spinlock has been acquired.
1075  */
1076 void et131x_handle_recv_interrupt(struct et131x_adapter *etdev)
1077 {
1078         PMP_RFD rfd = NULL;
1079         struct sk_buff *packets[NUM_PACKETS_HANDLED];
1080         PMP_RFD freed[NUM_PACKETS_HANDLED];
1081         u32 count = 0;
1082         u32 nfree = 0;
1083         bool done = true;
1084
1085         /* Process up to available RFD's */
1086         while (count < NUM_PACKETS_HANDLED) {
1087                 if (list_empty(&etdev->RxRing.RecvList)) {
1088                         WARN_ON(etdev->RxRing.nReadyRecv != 0);
1089                         done = false;
1090                         break;
1091                 }
1092
1093                 rfd = nic_rx_pkts(etdev);
1094
1095                 if (rfd == NULL)
1096                         break;
1097
1098                 /* Do not receive any packets until a filter has been set.
1099                  * Do not receive any packets until we have link.
1100                  * If length is zero, return the RFD in order to advance the
1101                  * Free buffer ring.
1102                  */
1103                 if (!etdev->PacketFilter ||
1104                     !(etdev->Flags & fMP_ADAPTER_LINK_DETECTION) ||
1105                     rfd->PacketSize == 0) {
1106                         continue;
1107                 }
1108
1109                 /* Increment the number of packets we received */
1110                 etdev->Stats.ipackets++;
1111
1112                 /* Set the status on the packet, either resources or success */
1113                 if (etdev->RxRing.nReadyRecv >= RFD_LOW_WATER_MARK) {
1114                         /* Put this RFD on the pending list
1115                          *
1116                          * NOTE: nic_rx_pkts() above is already returning the
1117                          * RFD to the RecvList, so don't additionally do that
1118                          * here.
1119                          * Besides, we don't really need (at this point) the
1120                          * pending list anyway.
1121                          */
1122                 } else {
1123                         freed[nfree] = rfd;
1124                         nfree++;
1125
1126                         dev_warn(&etdev->pdev->dev,
1127                                     "RFD's are running out\n");
1128                 }
1129
1130                 packets[count] = rfd->Packet;
1131                 count++;
1132         }
1133
1134         if (count == NUM_PACKETS_HANDLED || !done) {
1135                 etdev->RxRing.UnfinishedReceives = true;
1136                 writel(PARM_TX_TIME_INT_DEF * NANO_IN_A_MICRO,
1137                        &etdev->regs->global.watchdog_timer);
1138         } else
1139                 /* Watchdog timer will disable itself if appropriate. */
1140                 etdev->RxRing.UnfinishedReceives = false;
1141 }
1142
1143 static inline u32 bump_fbr(u32 *fbr, u32 limit)
1144 {
1145         u32 v = *fbr;
1146         v++;
1147         /* This works for all cases where limit < 1024. The 1023 case
1148            works because 1023++ is 1024 which means the if condition is not
1149            taken but the carry of the bit into the wrap bit toggles the wrap
1150            value correctly */
1151         if ((v & ET_DMA10_MASK) > limit) {
1152                 v &= ~ET_DMA10_MASK;
1153                 v ^= ET_DMA10_WRAP;
1154         }
1155         /* For the 1023 case */
1156         v &= (ET_DMA10_MASK|ET_DMA10_WRAP);
1157         *fbr = v;
1158         return v;
1159 }
1160
1161 /**
1162  * NICReturnRFD - Recycle a RFD and put it back onto the receive list
1163  * @etdev: pointer to our adapter
1164  * @rfd: pointer to the RFD
1165  */
1166 void nic_return_rfd(struct et131x_adapter *etdev, PMP_RFD rfd)
1167 {
1168         struct _rx_ring_t *rx_local = &etdev->RxRing;
1169         struct _RXDMA_t __iomem *rx_dma = &etdev->regs->rxdma;
1170         uint16_t bi = rfd->bufferindex;
1171         uint8_t ri = rfd->ringindex;
1172         unsigned long flags;
1173
1174         /* We don't use any of the OOB data besides status. Otherwise, we
1175          * need to clean up OOB data
1176          */
1177         if (
1178 #ifdef USE_FBR0
1179             (ri == 0 && bi < rx_local->Fbr0NumEntries) ||
1180 #endif
1181             (ri == 1 && bi < rx_local->Fbr1NumEntries)) {
1182                 spin_lock_irqsave(&etdev->FbrLock, flags);
1183
1184                 if (ri == 1) {
1185                         PFBR_DESC_t next =
1186                             (PFBR_DESC_t) (rx_local->pFbr1RingVa) +
1187                             INDEX10(rx_local->local_Fbr1_full);
1188
1189                         /* Handle the Free Buffer Ring advancement here. Write
1190                          * the PA / Buffer Index for the returned buffer into
1191                          * the oldest (next to be freed)FBR entry
1192                          */
1193                         next->addr_hi = rx_local->Fbr[1]->PAHigh[bi];
1194                         next->addr_lo = rx_local->Fbr[1]->PALow[bi];
1195                         next->word2.value = bi;
1196
1197                         writel(bump_fbr(&rx_local->local_Fbr1_full,
1198                                 rx_local->Fbr1NumEntries - 1),
1199                                 &rx_dma->fbr1_full_offset);
1200                 }
1201 #ifdef USE_FBR0
1202                 else {
1203                         PFBR_DESC_t next =
1204                             (PFBR_DESC_t) rx_local->pFbr0RingVa +
1205                             INDEX10(rx_local->local_Fbr0_full);
1206
1207                         /* Handle the Free Buffer Ring advancement here. Write
1208                          * the PA / Buffer Index for the returned buffer into
1209                          * the oldest (next to be freed) FBR entry
1210                          */
1211                         next->addr_hi = rx_local->Fbr[0]->PAHigh[bi];
1212                         next->addr_lo = rx_local->Fbr[0]->PALow[bi];
1213                         next->word2.value = bi;
1214
1215                         writel(bump_fbr(&rx_local->local_Fbr0_full,
1216                                         rx_local->Fbr0NumEntries - 1),
1217                                &rx_dma->fbr0_full_offset);
1218                 }
1219 #endif
1220                 spin_unlock_irqrestore(&etdev->FbrLock, flags);
1221         } else {
1222                 dev_err(&etdev->pdev->dev,
1223                           "NICReturnRFD illegal Buffer Index returned\n");
1224         }
1225
1226         /* The processing on this RFD is done, so put it back on the tail of
1227          * our list
1228          */
1229         spin_lock_irqsave(&etdev->RcvLock, flags);
1230         list_add_tail(&rfd->list_node, &rx_local->RecvList);
1231         rx_local->nReadyRecv++;
1232         spin_unlock_irqrestore(&etdev->RcvLock, flags);
1233
1234         WARN_ON(rx_local->nReadyRecv > rx_local->NumRfd);
1235 }