drivers/net/ethernet/intel/igbvf/netdev.c

   1 /*******************************************************************************
   2
   3   Intel(R) 82576 Virtual Function Linux driver
   4   Copyright(c) 2009 - 2012 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, see <http://www.gnu.org/licenses/>.
  17
  18   The full GNU General Public License is included in this distribution in
  19   the file called "COPYING".
  20
  21   Contact Information:
  22   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  23   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24
  25 *******************************************************************************/
  26
  27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  28
  29 #include <linux/module.h>
  30 #include <linux/types.h>
  31 #include <linux/init.h>
  32 #include <linux/pci.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/pagemap.h>
  35 #include <linux/delay.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/tcp.h>
  38 #include <linux/ipv6.h>
  39 #include <linux/slab.h>
  40 #include <net/checksum.h>
  41 #include <net/ip6_checksum.h>
  42 #include <linux/mii.h>
  43 #include <linux/ethtool.h>
  44 #include <linux/if_vlan.h>
  45 #include <linux/prefetch.h>
  46 #include <linux/sctp.h>
  47
  48 #include "igbvf.h"
  49
  50 #define DRV_VERSION "2.0.2-k"
  51 char igbvf_driver_name[] = "igbvf";
  52 const char igbvf_driver_version[] = DRV_VERSION;
  53 static const char igbvf_driver_string[] =
  54                   "Intel(R) Gigabit Virtual Function Network Driver";
  55 static const char igbvf_copyright[] =
  56                   "Copyright (c) 2009 - 2012 Intel Corporation.";
  57
  58 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
  59 static int debug = -1;
  60 module_param(debug, int, 0);
  61 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  62
  63 static int igbvf_poll(struct napi_struct *napi, int budget);
  64 static void igbvf_reset(struct igbvf_adapter *);
  65 static void igbvf_set_interrupt_capability(struct igbvf_adapter *);
  66 static void igbvf_reset_interrupt_capability(struct igbvf_adapter *);
  67
  68 static struct igbvf_info igbvf_vf_info = {
  69         .mac            = e1000_vfadapt,
  70         .flags          = 0,
  71         .pba            = 10,
  72         .init_ops       = e1000_init_function_pointers_vf,
  73 };
  74
  75 static struct igbvf_info igbvf_i350_vf_info = {
  76         .mac            = e1000_vfadapt_i350,
  77         .flags          = 0,
  78         .pba            = 10,
  79         .init_ops       = e1000_init_function_pointers_vf,
  80 };
  81
  82 static const struct igbvf_info *igbvf_info_tbl[] = {
  83         [board_vf]      = &igbvf_vf_info,
  84         [board_i350_vf] = &igbvf_i350_vf_info,
  85 };
  86
  87 /**
  88  * igbvf_desc_unused - calculate if we have unused descriptors
  89  * @rx_ring: address of receive ring structure
  90  **/
  91 static int igbvf_desc_unused(struct igbvf_ring *ring)
  92 {
  93         if (ring->next_to_clean > ring->next_to_use)
  94                 return ring->next_to_clean - ring->next_to_use - 1;
  95
  96         return ring->count + ring->next_to_clean - ring->next_to_use - 1;
  97 }
  98
  99 /**
 100  * igbvf_receive_skb - helper function to handle Rx indications
 101  * @adapter: board private structure
 102  * @status: descriptor status field as written by hardware
 103  * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
 104  * @skb: pointer to sk_buff to be indicated to stack
 105  **/
 106 static void igbvf_receive_skb(struct igbvf_adapter *adapter,
 107                               struct net_device *netdev,
 108                               struct sk_buff *skb,
 109                               u32 status, u16 vlan)
 110 {
 111         u16 vid;
 112
 113         if (status & E1000_RXD_STAT_VP) {
 114                 if ((adapter->flags & IGBVF_FLAG_RX_LB_VLAN_BSWAP) &&
 115                     (status & E1000_RXDEXT_STATERR_LB))
 116                         vid = be16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
 117                 else
 118                         vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
 119                 if (test_bit(vid, adapter->active_vlans))
 120                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
 121         }
 122
 123         napi_gro_receive(&adapter->rx_ring->napi, skb);
 124 }
 125
 126 static inline void igbvf_rx_checksum_adv(struct igbvf_adapter *adapter,
 127                                          u32 status_err, struct sk_buff *skb)
 128 {
 129         skb_checksum_none_assert(skb);
 130
 131         /* Ignore Checksum bit is set or checksum is disabled through ethtool */
 132         if ((status_err & E1000_RXD_STAT_IXSM) ||
 133             (adapter->flags & IGBVF_FLAG_RX_CSUM_DISABLED))
 134                 return;
 135
 136         /* TCP/UDP checksum error bit is set */
 137         if (status_err &
 138             (E1000_RXDEXT_STATERR_TCPE | E1000_RXDEXT_STATERR_IPE)) {
 139                 /* let the stack verify checksum errors */
 140                 adapter->hw_csum_err++;
 141                 return;
 142         }
 143
 144         /* It must be a TCP or UDP packet with a valid checksum */
 145         if (status_err & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS))
 146                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 147
 148         adapter->hw_csum_good++;
 149 }
 150
 151 /**
 152  * igbvf_alloc_rx_buffers - Replace used receive buffers; packet split
 153  * @rx_ring: address of ring structure to repopulate
 154  * @cleaned_count: number of buffers to repopulate
 155  **/
 156 static void igbvf_alloc_rx_buffers(struct igbvf_ring *rx_ring,
 157                                    int cleaned_count)
 158 {
 159         struct igbvf_adapter *adapter = rx_ring->adapter;
 160         struct net_device *netdev = adapter->netdev;
 161         struct pci_dev *pdev = adapter->pdev;
 162         union e1000_adv_rx_desc *rx_desc;
 163         struct igbvf_buffer *buffer_info;
 164         struct sk_buff *skb;
 165         unsigned int i;
 166         int bufsz;
 167
 168         i = rx_ring->next_to_use;
 169         buffer_info = &rx_ring->buffer_info[i];
 170
 171         if (adapter->rx_ps_hdr_size)
 172                 bufsz = adapter->rx_ps_hdr_size;
 173         else
 174                 bufsz = adapter->rx_buffer_len;
 175
 176         while (cleaned_count--) {
 177                 rx_desc = IGBVF_RX_DESC_ADV(*rx_ring, i);
 178
 179                 if (adapter->rx_ps_hdr_size && !buffer_info->page_dma) {
 180                         if (!buffer_info->page) {
 181                                 buffer_info->page = alloc_page(GFP_ATOMIC);
 182                                 if (!buffer_info->page) {
 183                                         adapter->alloc_rx_buff_failed++;
 184                                         goto no_buffers;
 185                                 }
 186                                 buffer_info->page_offset = 0;
 187                         } else {
 188                                 buffer_info->page_offset ^= PAGE_SIZE / 2;
 189                         }
 190                         buffer_info->page_dma =
 191                                 dma_map_page(&pdev->dev, buffer_info->page,
 192                                              buffer_info->page_offset,
 193                                              PAGE_SIZE / 2,
 194                                              DMA_FROM_DEVICE);
 195                         if (dma_mapping_error(&pdev->dev,
 196                                               buffer_info->page_dma)) {
 197                                 __free_page(buffer_info->page);
 198                                 buffer_info->page = NULL;
 199                                 dev_err(&pdev->dev, "RX DMA map failed\n");
 200                                 break;
 201                         }
 202                 }
 203
 204                 if (!buffer_info->skb) {
 205                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
 206                         if (!skb) {
 207                                 adapter->alloc_rx_buff_failed++;
 208                                 goto no_buffers;
 209                         }
 210
 211                         buffer_info->skb = skb;
 212                         buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
 213                                                           bufsz,
 214                                                           DMA_FROM_DEVICE);
 215                         if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
 216                                 dev_kfree_skb(buffer_info->skb);
 217                                 buffer_info->skb = NULL;
 218                                 dev_err(&pdev->dev, "RX DMA map failed\n");
 219                                 goto no_buffers;
 220                         }
 221                 }
 222                 /* Refresh the desc even if buffer_addrs didn't change because
 223                  * each write-back erases this info.
 224                  */
 225                 if (adapter->rx_ps_hdr_size) {
 226                         rx_desc->read.pkt_addr =
 227                              cpu_to_le64(buffer_info->page_dma);
 228                         rx_desc->read.hdr_addr = cpu_to_le64(buffer_info->dma);
 229                 } else {
 230                         rx_desc->read.pkt_addr = cpu_to_le64(buffer_info->dma);
 231                         rx_desc->read.hdr_addr = 0;
 232                 }
 233
 234                 i++;
 235                 if (i == rx_ring->count)
 236                         i = 0;
 237                 buffer_info = &rx_ring->buffer_info[i];
 238         }
 239
 240 no_buffers:
 241         if (rx_ring->next_to_use != i) {
 242                 rx_ring->next_to_use = i;
 243                 if (i == 0)
 244                         i = (rx_ring->count - 1);
 245                 else
 246                         i--;
 247
 248                 /* Force memory writes to complete before letting h/w
 249                  * know there are new descriptors to fetch.  (Only
 250                  * applicable for weak-ordered memory model archs,
 251                  * such as IA-64).
 252                 */
 253                 wmb();
 254                 writel(i, adapter->hw.hw_addr + rx_ring->tail);
 255         }
 256 }
 257
 258 /**
 259  * igbvf_clean_rx_irq - Send received data up the network stack; legacy
 260  * @adapter: board private structure
 261  *
 262  * the return value indicates whether actual cleaning was done, there
 263  * is no guarantee that everything was cleaned
 264  **/
 265 static bool igbvf_clean_rx_irq(struct igbvf_adapter *adapter,
 266                                int *work_done, int work_to_do)
 267 {
 268         struct igbvf_ring *rx_ring = adapter->rx_ring;
 269         struct net_device *netdev = adapter->netdev;
 270         struct pci_dev *pdev = adapter->pdev;
 271         union e1000_adv_rx_desc *rx_desc, *next_rxd;
 272         struct igbvf_buffer *buffer_info, *next_buffer;
 273         struct sk_buff *skb;
 274         bool cleaned = false;
 275         int cleaned_count = 0;
 276         unsigned int total_bytes = 0, total_packets = 0;
 277         unsigned int i;
 278         u32 length, hlen, staterr;
 279
 280         i = rx_ring->next_to_clean;
 281         rx_desc = IGBVF_RX_DESC_ADV(*rx_ring, i);
 282         staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 283
 284         while (staterr & E1000_RXD_STAT_DD) {
 285                 if (*work_done >= work_to_do)
 286                         break;
 287                 (*work_done)++;
 288                 rmb(); /* read descriptor and rx_buffer_info after status DD */
 289
 290                 buffer_info = &rx_ring->buffer_info[i];
 291
 292                 /* HW will not DMA in data larger than the given buffer, even
 293                  * if it parses the (NFS, of course) header to be larger.  In
 294                  * that case, it fills the header buffer and spills the rest
 295                  * into the page.
 296                  */
 297                 hlen = (le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.hdr_info)
 298                        & E1000_RXDADV_HDRBUFLEN_MASK) >>
 299                        E1000_RXDADV_HDRBUFLEN_SHIFT;
 300                 if (hlen > adapter->rx_ps_hdr_size)
 301                         hlen = adapter->rx_ps_hdr_size;
 302
 303                 length = le16_to_cpu(rx_desc->wb.upper.length);
 304                 cleaned = true;
 305                 cleaned_count++;
 306
 307                 skb = buffer_info->skb;
 308                 prefetch(skb->data - NET_IP_ALIGN);
 309                 buffer_info->skb = NULL;
 310                 if (!adapter->rx_ps_hdr_size) {
 311                         dma_unmap_single(&pdev->dev, buffer_info->dma,
 312                                          adapter->rx_buffer_len,
 313                                          DMA_FROM_DEVICE);
 314                         buffer_info->dma = 0;
 315                         skb_put(skb, length);
 316                         goto send_up;
 317                 }
 318
 319                 if (!skb_shinfo(skb)->nr_frags) {
 320                         dma_unmap_single(&pdev->dev, buffer_info->dma,
 321                                          adapter->rx_ps_hdr_size,
 322                                          DMA_FROM_DEVICE);
 323                         buffer_info->dma = 0;
 324                         skb_put(skb, hlen);
 325                 }
 326
 327                 if (length) {
 328                         dma_unmap_page(&pdev->dev, buffer_info->page_dma,
 329                                        PAGE_SIZE / 2,
 330                                        DMA_FROM_DEVICE);
 331                         buffer_info->page_dma = 0;
 332
 333                         skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
 334                                            buffer_info->page,
 335                                            buffer_info->page_offset,
 336                                            length);
 337
 338                         if ((adapter->rx_buffer_len > (PAGE_SIZE / 2)) ||
 339                             (page_count(buffer_info->page) != 1))
 340                                 buffer_info->page = NULL;
 341                         else
 342                                 get_page(buffer_info->page);
 343
 344                         skb->len += length;
 345                         skb->data_len += length;
 346                         skb->truesize += PAGE_SIZE / 2;
 347                 }
 348 send_up:
 349                 i++;
 350                 if (i == rx_ring->count)
 351                         i = 0;
 352                 next_rxd = IGBVF_RX_DESC_ADV(*rx_ring, i);
 353                 prefetch(next_rxd);
 354                 next_buffer = &rx_ring->buffer_info[i];
 355
 356                 if (!(staterr & E1000_RXD_STAT_EOP)) {
 357                         buffer_info->skb = next_buffer->skb;
 358                         buffer_info->dma = next_buffer->dma;
 359                         next_buffer->skb = skb;
 360                         next_buffer->dma = 0;
 361                         goto next_desc;
 362                 }
 363
 364                 if (staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) {
 365                         dev_kfree_skb_irq(skb);
 366                         goto next_desc;
 367                 }
 368
 369                 total_bytes += skb->len;
 370                 total_packets++;
 371
 372                 igbvf_rx_checksum_adv(adapter, staterr, skb);
 373
 374                 skb->protocol = eth_type_trans(skb, netdev);
 375
 376                 igbvf_receive_skb(adapter, netdev, skb, staterr,
 377                                   rx_desc->wb.upper.vlan);
 378
 379 next_desc:
 380                 rx_desc->wb.upper.status_error = 0;
 381
 382                 /* return some buffers to hardware, one at a time is too slow */
 383                 if (cleaned_count >= IGBVF_RX_BUFFER_WRITE) {
 384                         igbvf_alloc_rx_buffers(rx_ring, cleaned_count);
 385                         cleaned_count = 0;
 386                 }
 387
 388                 /* use prefetched values */
 389                 rx_desc = next_rxd;
 390                 buffer_info = next_buffer;
 391
 392                 staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 393         }
 394
 395         rx_ring->next_to_clean = i;
 396         cleaned_count = igbvf_desc_unused(rx_ring);
 397
 398         if (cleaned_count)
 399                 igbvf_alloc_rx_buffers(rx_ring, cleaned_count);
 400
 401         adapter->total_rx_packets += total_packets;
 402         adapter->total_rx_bytes += total_bytes;
 403         adapter->net_stats.rx_bytes += total_bytes;
 404         adapter->net_stats.rx_packets += total_packets;
 405         return cleaned;
 406 }
 407
 408 static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
 409                             struct igbvf_buffer *buffer_info)
 410 {
 411         if (buffer_info->dma) {
 412                 if (buffer_info->mapped_as_page)
 413                         dma_unmap_page(&adapter->pdev->dev,
 414                                        buffer_info->dma,
 415                                        buffer_info->length,
 416                                        DMA_TO_DEVICE);
 417                 else
 418                         dma_unmap_single(&adapter->pdev->dev,
 419                                          buffer_info->dma,
 420                                          buffer_info->length,
 421                                          DMA_TO_DEVICE);
 422                 buffer_info->dma = 0;
 423         }
 424         if (buffer_info->skb) {
 425                 dev_kfree_skb_any(buffer_info->skb);
 426                 buffer_info->skb = NULL;
 427         }
 428         buffer_info->time_stamp = 0;
 429 }
 430
 431 /**
 432  * igbvf_setup_tx_resources - allocate Tx resources (Descriptors)
 433  * @adapter: board private structure
 434  *
 435  * Return 0 on success, negative on failure
 436  **/
 437 int igbvf_setup_tx_resources(struct igbvf_adapter *adapter,
 438                              struct igbvf_ring *tx_ring)
 439 {
 440         struct pci_dev *pdev = adapter->pdev;
 441         int size;
 442
 443         size = sizeof(struct igbvf_buffer) * tx_ring->count;
 444         tx_ring->buffer_info = vzalloc(size);
 445         if (!tx_ring->buffer_info)
 446                 goto err;
 447
 448         /* round up to nearest 4K */
 449         tx_ring->size = tx_ring->count * sizeof(union e1000_adv_tx_desc);
 450         tx_ring->size = ALIGN(tx_ring->size, 4096);
 451
 452         tx_ring->desc = dma_alloc_coherent(&pdev->dev, tx_ring->size,
 453                                            &tx_ring->dma, GFP_KERNEL);
 454         if (!tx_ring->desc)
 455                 goto err;
 456
 457         tx_ring->adapter = adapter;
 458         tx_ring->next_to_use = 0;
 459         tx_ring->next_to_clean = 0;
 460
 461         return 0;
 462 err:
 463         vfree(tx_ring->buffer_info);
 464         dev_err(&adapter->pdev->dev,
 465                 "Unable to allocate memory for the transmit descriptor ring\n");
 466         return -ENOMEM;
 467 }
 468
 469 /**
 470  * igbvf_setup_rx_resources - allocate Rx resources (Descriptors)
 471  * @adapter: board private structure
 472  *
 473  * Returns 0 on success, negative on failure
 474  **/
 475 int igbvf_setup_rx_resources(struct igbvf_adapter *adapter,
 476                              struct igbvf_ring *rx_ring)
 477 {
 478         struct pci_dev *pdev = adapter->pdev;
 479         int size, desc_len;
 480
 481         size = sizeof(struct igbvf_buffer) * rx_ring->count;
 482         rx_ring->buffer_info = vzalloc(size);
 483         if (!rx_ring->buffer_info)
 484                 goto err;
 485
 486         desc_len = sizeof(union e1000_adv_rx_desc);
 487
 488         /* Round up to nearest 4K */
 489         rx_ring->size = rx_ring->count * desc_len;
 490         rx_ring->size = ALIGN(rx_ring->size, 4096);
 491
 492         rx_ring->desc = dma_alloc_coherent(&pdev->dev, rx_ring->size,
 493                                            &rx_ring->dma, GFP_KERNEL);
 494         if (!rx_ring->desc)
 495                 goto err;
 496
 497         rx_ring->next_to_clean = 0;
 498         rx_ring->next_to_use = 0;
 499
 500         rx_ring->adapter = adapter;
 501
 502         return 0;
 503
 504 err:
 505         vfree(rx_ring->buffer_info);
 506         rx_ring->buffer_info = NULL;
 507         dev_err(&adapter->pdev->dev,
 508                 "Unable to allocate memory for the receive descriptor ring\n");
 509         return -ENOMEM;
 510 }
 511
 512 /**
 513  * igbvf_clean_tx_ring - Free Tx Buffers
 514  * @tx_ring: ring to be cleaned
 515  **/
 516 static void igbvf_clean_tx_ring(struct igbvf_ring *tx_ring)
 517 {
 518         struct igbvf_adapter *adapter = tx_ring->adapter;
 519         struct igbvf_buffer *buffer_info;
 520         unsigned long size;
 521         unsigned int i;
 522
 523         if (!tx_ring->buffer_info)
 524                 return;
 525
 526         /* Free all the Tx ring sk_buffs */
 527         for (i = 0; i < tx_ring->count; i++) {
 528                 buffer_info = &tx_ring->buffer_info[i];
 529                 igbvf_put_txbuf(adapter, buffer_info);
 530         }
 531
 532         size = sizeof(struct igbvf_buffer) * tx_ring->count;
 533         memset(tx_ring->buffer_info, 0, size);
 534
 535         /* Zero out the descriptor ring */
 536         memset(tx_ring->desc, 0, tx_ring->size);
 537
 538         tx_ring->next_to_use = 0;
 539         tx_ring->next_to_clean = 0;
 540
 541         writel(0, adapter->hw.hw_addr + tx_ring->head);
 542         writel(0, adapter->hw.hw_addr + tx_ring->tail);
 543 }
 544
 545 /**
 546  * igbvf_free_tx_resources - Free Tx Resources per Queue
 547  * @tx_ring: ring to free resources from
 548  *
 549  * Free all transmit software resources
 550  **/
 551 void igbvf_free_tx_resources(struct igbvf_ring *tx_ring)
 552 {
 553         struct pci_dev *pdev = tx_ring->adapter->pdev;
 554
 555         igbvf_clean_tx_ring(tx_ring);
 556
 557         vfree(tx_ring->buffer_info);
 558         tx_ring->buffer_info = NULL;
 559
 560         dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
 561                           tx_ring->dma);
 562
 563         tx_ring->desc = NULL;
 564 }
 565
 566 /**
 567  * igbvf_clean_rx_ring - Free Rx Buffers per Queue
 568  * @adapter: board private structure
 569  **/
 570 static void igbvf_clean_rx_ring(struct igbvf_ring *rx_ring)
 571 {
 572         struct igbvf_adapter *adapter = rx_ring->adapter;
 573         struct igbvf_buffer *buffer_info;
 574         struct pci_dev *pdev = adapter->pdev;
 575         unsigned long size;
 576         unsigned int i;
 577
 578         if (!rx_ring->buffer_info)
 579                 return;
 580
 581         /* Free all the Rx ring sk_buffs */
 582         for (i = 0; i < rx_ring->count; i++) {
 583                 buffer_info = &rx_ring->buffer_info[i];
 584                 if (buffer_info->dma) {
 585                         if (adapter->rx_ps_hdr_size) {
 586                                 dma_unmap_single(&pdev->dev, buffer_info->dma,
 587                                                  adapter->rx_ps_hdr_size,
 588                                                  DMA_FROM_DEVICE);
 589                         } else {
 590                                 dma_unmap_single(&pdev->dev, buffer_info->dma,
 591                                                  adapter->rx_buffer_len,
 592                                                  DMA_FROM_DEVICE);
 593                         }
 594                         buffer_info->dma = 0;
 595                 }
 596
 597                 if (buffer_info->skb) {
 598                         dev_kfree_skb(buffer_info->skb);
 599                         buffer_info->skb = NULL;
 600                 }
 601
 602                 if (buffer_info->page) {
 603                         if (buffer_info->page_dma)
 604                                 dma_unmap_page(&pdev->dev,
 605                                                buffer_info->page_dma,
 606                                                PAGE_SIZE / 2,
 607                                                DMA_FROM_DEVICE);
 608                         put_page(buffer_info->page);
 609                         buffer_info->page = NULL;
 610                         buffer_info->page_dma = 0;
 611                         buffer_info->page_offset = 0;
 612                 }
 613         }
 614
 615         size = sizeof(struct igbvf_buffer) * rx_ring->count;
 616         memset(rx_ring->buffer_info, 0, size);
 617
 618         /* Zero out the descriptor ring */
 619         memset(rx_ring->desc, 0, rx_ring->size);
 620
 621         rx_ring->next_to_clean = 0;
 622         rx_ring->next_to_use = 0;
 623
 624         writel(0, adapter->hw.hw_addr + rx_ring->head);
 625         writel(0, adapter->hw.hw_addr + rx_ring->tail);
 626 }
 627
 628 /**
 629  * igbvf_free_rx_resources - Free Rx Resources
 630  * @rx_ring: ring to clean the resources from
 631  *
 632  * Free all receive software resources
 633  **/
 634
 635 void igbvf_free_rx_resources(struct igbvf_ring *rx_ring)
 636 {
 637         struct pci_dev *pdev = rx_ring->adapter->pdev;
 638
 639         igbvf_clean_rx_ring(rx_ring);
 640
 641         vfree(rx_ring->buffer_info);
 642         rx_ring->buffer_info = NULL;
 643
 644         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 645                           rx_ring->dma);
 646         rx_ring->desc = NULL;
 647 }
 648
 649 /**
 650  * igbvf_update_itr - update the dynamic ITR value based on statistics
 651  * @adapter: pointer to adapter
 652  * @itr_setting: current adapter->itr
 653  * @packets: the number of packets during this measurement interval
 654  * @bytes: the number of bytes during this measurement interval
 655  *
 656  * Stores a new ITR value based on packets and byte counts during the last
 657  * interrupt.  The advantage of per interrupt computation is faster updates
 658  * and more accurate ITR for the current traffic pattern.  Constants in this
 659  * function were computed based on theoretical maximum wire speed and thresholds
 660  * were set based on testing data as well as attempting to minimize response
 661  * time while increasing bulk throughput.
 662  **/
 663 static enum latency_range igbvf_update_itr(struct igbvf_adapter *adapter,
 664                                            enum latency_range itr_setting,
 665                                            int packets, int bytes)
 666 {
 667         enum latency_range retval = itr_setting;
 668
 669         if (packets == 0)
 670                 goto update_itr_done;
 671
 672         switch (itr_setting) {
 673         case lowest_latency:
 674                 /* handle TSO and jumbo frames */
 675                 if (bytes/packets > 8000)
 676                         retval = bulk_latency;
 677                 else if ((packets < 5) && (bytes > 512))
 678                         retval = low_latency;
 679                 break;
 680         case low_latency:  /* 50 usec aka 20000 ints/s */
 681                 if (bytes > 10000) {
 682                         /* this if handles the TSO accounting */
 683                         if (bytes/packets > 8000)
 684                                 retval = bulk_latency;
 685                         else if ((packets < 10) || ((bytes/packets) > 1200))
 686                                 retval = bulk_latency;
 687                         else if ((packets > 35))
 688                                 retval = lowest_latency;
 689                 } else if (bytes/packets > 2000) {
 690                         retval = bulk_latency;
 691                 } else if (packets <= 2 && bytes < 512) {
 692                         retval = lowest_latency;
 693                 }
 694                 break;
 695         case bulk_latency: /* 250 usec aka 4000 ints/s */
 696                 if (bytes > 25000) {
 697                         if (packets > 35)
 698                                 retval = low_latency;
 699                 } else if (bytes < 6000) {
 700                         retval = low_latency;
 701                 }
 702                 break;
 703         default:
 704                 break;
 705         }
 706
 707 update_itr_done:
 708         return retval;
 709 }
 710
 711 static int igbvf_range_to_itr(enum latency_range current_range)
 712 {
 713         int new_itr;
 714
 715         switch (current_range) {
 716         /* counts and packets in update_itr are dependent on these numbers */
 717         case lowest_latency:
 718                 new_itr = IGBVF_70K_ITR;
 719                 break;
 720         case low_latency:
 721                 new_itr = IGBVF_20K_ITR;
 722                 break;
 723         case bulk_latency:
 724                 new_itr = IGBVF_4K_ITR;
 725                 break;
 726         default:
 727                 new_itr = IGBVF_START_ITR;
 728                 break;
 729         }
 730         return new_itr;
 731 }
 732
 733 static void igbvf_set_itr(struct igbvf_adapter *adapter)
 734 {
 735         u32 new_itr;
 736
 737         adapter->tx_ring->itr_range =
 738                         igbvf_update_itr(adapter,
 739                                          adapter->tx_ring->itr_val,
 740                                          adapter->total_tx_packets,
 741                                          adapter->total_tx_bytes);
 742
 743         /* conservative mode (itr 3) eliminates the lowest_latency setting */
 744         if (adapter->requested_itr == 3 &&
 745             adapter->tx_ring->itr_range == lowest_latency)
 746                 adapter->tx_ring->itr_range = low_latency;
 747
 748         new_itr = igbvf_range_to_itr(adapter->tx_ring->itr_range);
 749
 750         if (new_itr != adapter->tx_ring->itr_val) {
 751                 u32 current_itr = adapter->tx_ring->itr_val;
 752                 /* this attempts to bias the interrupt rate towards Bulk
 753                  * by adding intermediate steps when interrupt rate is
 754                  * increasing
 755                  */
 756                 new_itr = new_itr > current_itr ?
 757                           min(current_itr + (new_itr >> 2), new_itr) :
 758                           new_itr;
 759                 adapter->tx_ring->itr_val = new_itr;
 760
 761                 adapter->tx_ring->set_itr = 1;
 762         }
 763
 764         adapter->rx_ring->itr_range =
 765                         igbvf_update_itr(adapter, adapter->rx_ring->itr_val,
 766                                          adapter->total_rx_packets,
 767                                          adapter->total_rx_bytes);
 768         if (adapter->requested_itr == 3 &&
 769             adapter->rx_ring->itr_range == lowest_latency)
 770                 adapter->rx_ring->itr_range = low_latency;
 771
 772         new_itr = igbvf_range_to_itr(adapter->rx_ring->itr_range);
 773
 774         if (new_itr != adapter->rx_ring->itr_val) {
 775                 u32 current_itr = adapter->rx_ring->itr_val;
 776
 777                 new_itr = new_itr > current_itr ?
 778                           min(current_itr + (new_itr >> 2), new_itr) :
 779                           new_itr;
 780                 adapter->rx_ring->itr_val = new_itr;
 781
 782                 adapter->rx_ring->set_itr = 1;
 783         }
 784 }
 785
 786 /**
 787  * igbvf_clean_tx_irq - Reclaim resources after transmit completes
 788  * @adapter: board private structure
 789  *
 790  * returns true if ring is completely cleaned
 791  **/
 792 static bool igbvf_clean_tx_irq(struct igbvf_ring *tx_ring)
 793 {
 794         struct igbvf_adapter *adapter = tx_ring->adapter;
 795         struct net_device *netdev = adapter->netdev;
 796         struct igbvf_buffer *buffer_info;
 797         struct sk_buff *skb;
 798         union e1000_adv_tx_desc *tx_desc, *eop_desc;
 799         unsigned int total_bytes = 0, total_packets = 0;
 800         unsigned int i, count = 0;
 801         bool cleaned = false;
 802
 803         i = tx_ring->next_to_clean;
 804         buffer_info = &tx_ring->buffer_info[i];
 805         eop_desc = buffer_info->next_to_watch;
 806
 807         do {
 808                 /* if next_to_watch is not set then there is no work pending */
 809                 if (!eop_desc)
 810                         break;
 811
 812                 /* prevent any other reads prior to eop_desc */
 813                 read_barrier_depends();
 814
 815                 /* if DD is not set pending work has not been completed */
 816                 if (!(eop_desc->wb.status & cpu_to_le32(E1000_TXD_STAT_DD)))
 817                         break;
 818
 819                 /* clear next_to_watch to prevent false hangs */
 820                 buffer_info->next_to_watch = NULL;
 821
 822                 for (cleaned = false; !cleaned; count++) {
 823                         tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
 824                         cleaned = (tx_desc == eop_desc);
 825                         skb = buffer_info->skb;
 826
 827                         if (skb) {
 828                                 unsigned int segs, bytecount;
 829
 830                                 /* gso_segs is currently only valid for tcp */
 831                                 segs = skb_shinfo(skb)->gso_segs ?: 1;
 832                                 /* multiply data chunks by size of headers */
 833                                 bytecount = ((segs - 1) * skb_headlen(skb)) +
 834                                             skb->len;
 835                                 total_packets += segs;
 836                                 total_bytes += bytecount;
 837                         }
 838
 839                         igbvf_put_txbuf(adapter, buffer_info);
 840                         tx_desc->wb.status = 0;
 841
 842                         i++;
 843                         if (i == tx_ring->count)
 844                                 i = 0;
 845
 846                         buffer_info = &tx_ring->buffer_info[i];
 847                 }
 848
 849                 eop_desc = buffer_info->next_to_watch;
 850         } while (count < tx_ring->count);
 851
 852         tx_ring->next_to_clean = i;
 853
 854         if (unlikely(count && netif_carrier_ok(netdev) &&
 855             igbvf_desc_unused(tx_ring) >= IGBVF_TX_QUEUE_WAKE)) {
 856                 /* Make sure that anybody stopping the queue after this
 857                  * sees the new next_to_clean.
 858                  */
 859                 smp_mb();
 860                 if (netif_queue_stopped(netdev) &&
 861                     !(test_bit(__IGBVF_DOWN, &adapter->state))) {
 862                         netif_wake_queue(netdev);
 863                         ++adapter->restart_queue;
 864                 }
 865         }
 866
 867         adapter->net_stats.tx_bytes += total_bytes;
 868         adapter->net_stats.tx_packets += total_packets;
 869         return count < tx_ring->count;
 870 }
 871
 872 static irqreturn_t igbvf_msix_other(int irq, void *data)
 873 {
 874         struct net_device *netdev = data;
 875         struct igbvf_adapter *adapter = netdev_priv(netdev);
 876         struct e1000_hw *hw = &adapter->hw;
 877
 878         adapter->int_counter1++;
 879
 880         hw->mac.get_link_status = 1;
 881         if (!test_bit(__IGBVF_DOWN, &adapter->state))
 882                 mod_timer(&adapter->watchdog_timer, jiffies + 1);
 883
 884         ew32(EIMS, adapter->eims_other);
 885
 886         return IRQ_HANDLED;
 887 }
 888
 889 static irqreturn_t igbvf_intr_msix_tx(int irq, void *data)
 890 {
 891         struct net_device *netdev = data;
 892         struct igbvf_adapter *adapter = netdev_priv(netdev);
 893         struct e1000_hw *hw = &adapter->hw;
 894         struct igbvf_ring *tx_ring = adapter->tx_ring;
 895
 896         if (tx_ring->set_itr) {
 897                 writel(tx_ring->itr_val,
 898                        adapter->hw.hw_addr + tx_ring->itr_register);
 899                 adapter->tx_ring->set_itr = 0;
 900         }
 901
 902         adapter->total_tx_bytes = 0;
 903         adapter->total_tx_packets = 0;
 904
 905         /* auto mask will automatically re-enable the interrupt when we write
 906          * EICS
 907          */
 908         if (!igbvf_clean_tx_irq(tx_ring))
 909                 /* Ring was not completely cleaned, so fire another interrupt */
 910                 ew32(EICS, tx_ring->eims_value);
 911         else
 912                 ew32(EIMS, tx_ring->eims_value);
 913
 914         return IRQ_HANDLED;
 915 }
 916
 917 static irqreturn_t igbvf_intr_msix_rx(int irq, void *data)
 918 {
 919         struct net_device *netdev = data;
 920         struct igbvf_adapter *adapter = netdev_priv(netdev);
 921
 922         adapter->int_counter0++;
 923
 924         /* Write the ITR value calculated at the end of the
 925          * previous interrupt.
 926          */
 927         if (adapter->rx_ring->set_itr) {
 928                 writel(adapter->rx_ring->itr_val,
 929                        adapter->hw.hw_addr + adapter->rx_ring->itr_register);
 930                 adapter->rx_ring->set_itr = 0;
 931         }
 932
 933         if (napi_schedule_prep(&adapter->rx_ring->napi)) {
 934                 adapter->total_rx_bytes = 0;
 935                 adapter->total_rx_packets = 0;
 936                 __napi_schedule(&adapter->rx_ring->napi);
 937         }
 938
 939         return IRQ_HANDLED;
 940 }
 941
 942 #define IGBVF_NO_QUEUE -1
 943
 944 static void igbvf_assign_vector(struct igbvf_adapter *adapter, int rx_queue,
 945                                 int tx_queue, int msix_vector)
 946 {
 947         struct e1000_hw *hw = &adapter->hw;
 948         u32 ivar, index;
 949
 950         /* 82576 uses a table-based method for assigning vectors.
 951          * Each queue has a single entry in the table to which we write
 952          * a vector number along with a "valid" bit.  Sadly, the layout
 953          * of the table is somewhat counterintuitive.
 954          */
 955         if (rx_queue > IGBVF_NO_QUEUE) {
 956                 index = (rx_queue >> 1);
 957                 ivar = array_er32(IVAR0, index);
 958                 if (rx_queue & 0x1) {
 959                         /* vector goes into third byte of register */
 960                         ivar = ivar & 0xFF00FFFF;
 961                         ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
 962                 } else {
 963                         /* vector goes into low byte of register */
 964                         ivar = ivar & 0xFFFFFF00;
 965                         ivar |= msix_vector | E1000_IVAR_VALID;
 966                 }
 967                 adapter->rx_ring[rx_queue].eims_value = BIT(msix_vector);
 968                 array_ew32(IVAR0, index, ivar);
 969         }
 970         if (tx_queue > IGBVF_NO_QUEUE) {
 971                 index = (tx_queue >> 1);
 972                 ivar = array_er32(IVAR0, index);
 973                 if (tx_queue & 0x1) {
 974                         /* vector goes into high byte of register */
 975                         ivar = ivar & 0x00FFFFFF;
 976                         ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
 977                 } else {
 978                         /* vector goes into second byte of register */
 979                         ivar = ivar & 0xFFFF00FF;
 980                         ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
 981                 }
 982                 adapter->tx_ring[tx_queue].eims_value = BIT(msix_vector);
 983                 array_ew32(IVAR0, index, ivar);
 984         }
 985 }
 986
 987 /**
 988  * igbvf_configure_msix - Configure MSI-X hardware
 989  * @adapter: board private structure
 990  *
 991  * igbvf_configure_msix sets up the hardware to properly
 992  * generate MSI-X interrupts.
 993  **/
 994 static void igbvf_configure_msix(struct igbvf_adapter *adapter)
 995 {
 996         u32 tmp;
 997         struct e1000_hw *hw = &adapter->hw;
 998         struct igbvf_ring *tx_ring = adapter->tx_ring;
 999         struct igbvf_ring *rx_ring = adapter->rx_ring;
1000         int vector = 0;
1001
1002         adapter->eims_enable_mask = 0;
1003
1004         igbvf_assign_vector(adapter, IGBVF_NO_QUEUE, 0, vector++);
1005         adapter->eims_enable_mask |= tx_ring->eims_value;
1006         writel(tx_ring->itr_val, hw->hw_addr + tx_ring->itr_register);
1007         igbvf_assign_vector(adapter, 0, IGBVF_NO_QUEUE, vector++);
1008         adapter->eims_enable_mask |= rx_ring->eims_value;
1009         writel(rx_ring->itr_val, hw->hw_addr + rx_ring->itr_register);
1010
1011         /* set vector for other causes, i.e. link changes */
1012
1013         tmp = (vector++ | E1000_IVAR_VALID);
1014
1015         ew32(IVAR_MISC, tmp);
1016
1017         adapter->eims_enable_mask = GENMASK(vector - 1, 0);
1018         adapter->eims_other = BIT(vector - 1);
1019         e1e_flush();
1020 }
1021
1022 static void igbvf_reset_interrupt_capability(struct igbvf_adapter *adapter)
1023 {
1024         if (adapter->msix_entries) {
1025                 pci_disable_msix(adapter->pdev);
1026                 kfree(adapter->msix_entries);
1027                 adapter->msix_entries = NULL;
1028         }
1029 }
1030
1031 /**
1032  * igbvf_set_interrupt_capability - set MSI or MSI-X if supported
1033  * @adapter: board private structure
1034  *
1035  * Attempt to configure interrupts using the best available
1036  * capabilities of the hardware and kernel.
1037  **/
1038 static void igbvf_set_interrupt_capability(struct igbvf_adapter *adapter)
1039 {
1040         int err = -ENOMEM;
1041         int i;
1042
1043         /* we allocate 3 vectors, 1 for Tx, 1 for Rx, one for PF messages */
1044         adapter->msix_entries = kcalloc(3, sizeof(struct msix_entry),
1045                                         GFP_KERNEL);
1046         if (adapter->msix_entries) {
1047                 for (i = 0; i < 3; i++)
1048                         adapter->msix_entries[i].entry = i;
1049
1050                 err = pci_enable_msix_range(adapter->pdev,
1051                                             adapter->msix_entries, 3, 3);
1052         }
1053
1054         if (err < 0) {
1055                 /* MSI-X failed */
1056                 dev_err(&adapter->pdev->dev,
1057                         "Failed to initialize MSI-X interrupts.\n");
1058                 igbvf_reset_interrupt_capability(adapter);
1059         }
1060 }
1061
1062 /**
1063  * igbvf_request_msix - Initialize MSI-X interrupts
1064  * @adapter: board private structure
1065  *
1066  * igbvf_request_msix allocates MSI-X vectors and requests interrupts from the
1067  * kernel.
1068  **/
1069 static int igbvf_request_msix(struct igbvf_adapter *adapter)
1070 {
1071         struct net_device *netdev = adapter->netdev;
1072         int err = 0, vector = 0;
1073
1074         if (strlen(netdev->name) < (IFNAMSIZ - 5)) {
1075                 sprintf(adapter->tx_ring->name, "%s-tx-0", netdev->name);
1076                 sprintf(adapter->rx_ring->name, "%s-rx-0", netdev->name);
1077         } else {
1078                 memcpy(adapter->tx_ring->name, netdev->name, IFNAMSIZ);
1079                 memcpy(adapter->rx_ring->name, netdev->name, IFNAMSIZ);
1080         }
1081
1082         err = request_irq(adapter->msix_entries[vector].vector,
1083                           igbvf_intr_msix_tx, 0, adapter->tx_ring->name,
1084                           netdev);
1085         if (err)
1086                 goto out;
1087
1088         adapter->tx_ring->itr_register = E1000_EITR(vector);
1089         adapter->tx_ring->itr_val = adapter->current_itr;
1090         vector++;
1091
1092         err = request_irq(adapter->msix_entries[vector].vector,
1093                           igbvf_intr_msix_rx, 0, adapter->rx_ring->name,
1094                           netdev);
1095         if (err)
1096                 goto out;
1097
1098         adapter->rx_ring->itr_register = E1000_EITR(vector);
1099         adapter->rx_ring->itr_val = adapter->current_itr;
1100         vector++;
1101
1102         err = request_irq(adapter->msix_entries[vector].vector,
1103                           igbvf_msix_other, 0, netdev->name, netdev);
1104         if (err)
1105                 goto out;
1106
1107         igbvf_configure_msix(adapter);
1108         return 0;
1109 out:
1110         return err;
1111 }
1112
1113 /**
1114  * igbvf_alloc_queues - Allocate memory for all rings
1115  * @adapter: board private structure to initialize
1116  **/
1117 static int igbvf_alloc_queues(struct igbvf_adapter *adapter)
1118 {
1119         struct net_device *netdev = adapter->netdev;
1120
1121         adapter->tx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
1122         if (!adapter->tx_ring)
1123                 return -ENOMEM;
1124
1125         adapter->rx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
1126         if (!adapter->rx_ring) {
1127                 kfree(adapter->tx_ring);
1128                 return -ENOMEM;
1129         }
1130
1131         netif_napi_add(netdev, &adapter->rx_ring->napi, igbvf_poll, 64);
1132
1133         return 0;
1134 }
1135
1136 /**
1137  * igbvf_request_irq - initialize interrupts
1138  * @adapter: board private structure
1139  *
1140  * Attempts to configure interrupts using the best available
1141  * capabilities of the hardware and kernel.
1142  **/
1143 static int igbvf_request_irq(struct igbvf_adapter *adapter)
1144 {
1145         int err = -1;
1146
1147         /* igbvf supports msi-x only */
1148         if (adapter->msix_entries)
1149                 err = igbvf_request_msix(adapter);
1150
1151         if (!err)
1152                 return err;
1153
1154         dev_err(&adapter->pdev->dev,
1155                 "Unable to allocate interrupt, Error: %d\n", err);
1156
1157         return err;
1158 }
1159
1160 static void igbvf_free_irq(struct igbvf_adapter *adapter)
1161 {
1162         struct net_device *netdev = adapter->netdev;
1163         int vector;
1164
1165         if (adapter->msix_entries) {
1166                 for (vector = 0; vector < 3; vector++)
1167                         free_irq(adapter->msix_entries[vector].vector, netdev);
1168         }
1169 }
1170
1171 /**
1172  * igbvf_irq_disable - Mask off interrupt generation on the NIC
1173  * @adapter: board private structure
1174  **/
1175 static void igbvf_irq_disable(struct igbvf_adapter *adapter)
1176 {
1177         struct e1000_hw *hw = &adapter->hw;
1178
1179         ew32(EIMC, ~0);
1180
1181         if (adapter->msix_entries)
1182                 ew32(EIAC, 0);
1183 }
1184
1185 /**
1186  * igbvf_irq_enable - Enable default interrupt generation settings
1187  * @adapter: board private structure
1188  **/
1189 static void igbvf_irq_enable(struct igbvf_adapter *adapter)
1190 {
1191         struct e1000_hw *hw = &adapter->hw;
1192
1193         ew32(EIAC, adapter->eims_enable_mask);
1194         ew32(EIAM, adapter->eims_enable_mask);
1195         ew32(EIMS, adapter->eims_enable_mask);
1196 }
1197
1198 /**
1199  * igbvf_poll - NAPI Rx polling callback
1200  * @napi: struct associated with this polling callback
1201  * @budget: amount of packets driver is allowed to process this poll
1202  **/
1203 static int igbvf_poll(struct napi_struct *napi, int budget)
1204 {
1205         struct igbvf_ring *rx_ring = container_of(napi, struct igbvf_ring, napi);
1206         struct igbvf_adapter *adapter = rx_ring->adapter;
1207         struct e1000_hw *hw = &adapter->hw;
1208         int work_done = 0;
1209
1210         igbvf_clean_rx_irq(adapter, &work_done, budget);
1211
1212         /* If not enough Rx work done, exit the polling mode */
1213         if (work_done < budget) {
1214                 napi_complete_done(napi, work_done);
1215
1216                 if (adapter->requested_itr & 3)
1217                         igbvf_set_itr(adapter);
1218
1219                 if (!test_bit(__IGBVF_DOWN, &adapter->state))
1220                         ew32(EIMS, adapter->rx_ring->eims_value);
1221         }
1222
1223         return work_done;
1224 }
1225
1226 /**
1227  * igbvf_set_rlpml - set receive large packet maximum length
1228  * @adapter: board private structure
1229  *
1230  * Configure the maximum size of packets that will be received
1231  */
1232 static void igbvf_set_rlpml(struct igbvf_adapter *adapter)
1233 {
1234         int max_frame_size;
1235         struct e1000_hw *hw = &adapter->hw;
1236
1237         max_frame_size = adapter->max_frame_size + VLAN_TAG_SIZE;
1238         e1000_rlpml_set_vf(hw, max_frame_size);
1239 }
1240
1241 static int igbvf_vlan_rx_add_vid(struct net_device *netdev,
1242                                  __be16 proto, u16 vid)
1243 {
1244         struct igbvf_adapter *adapter = netdev_priv(netdev);
1245         struct e1000_hw *hw = &adapter->hw;
1246
1247         if (hw->mac.ops.set_vfta(hw, vid, true)) {
1248                 dev_err(&adapter->pdev->dev, "Failed to add vlan id %d\n", vid);
1249                 return -EINVAL;
1250         }
1251         set_bit(vid, adapter->active_vlans);
1252         return 0;
1253 }
1254
1255 static int igbvf_vlan_rx_kill_vid(struct net_device *netdev,
1256                                   __be16 proto, u16 vid)
1257 {
1258         struct igbvf_adapter *adapter = netdev_priv(netdev);
1259         struct e1000_hw *hw = &adapter->hw;
1260
1261         if (hw->mac.ops.set_vfta(hw, vid, false)) {
1262                 dev_err(&adapter->pdev->dev,
1263                         "Failed to remove vlan id %d\n", vid);
1264                 return -EINVAL;
1265         }
1266         clear_bit(vid, adapter->active_vlans);
1267         return 0;
1268 }
1269
1270 static void igbvf_restore_vlan(struct igbvf_adapter *adapter)
1271 {
1272         u16 vid;
1273
1274         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
1275                 igbvf_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
1276 }
1277
1278 /**
1279  * igbvf_configure_tx - Configure Transmit Unit after Reset
1280  * @adapter: board private structure
1281  *
1282  * Configure the Tx unit of the MAC after a reset.
1283  **/
1284 static void igbvf_configure_tx(struct igbvf_adapter *adapter)
1285 {
1286         struct e1000_hw *hw = &adapter->hw;
1287         struct igbvf_ring *tx_ring = adapter->tx_ring;
1288         u64 tdba;
1289         u32 txdctl, dca_txctrl;
1290
1291         /* disable transmits */
1292         txdctl = er32(TXDCTL(0));
1293         ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
1294         e1e_flush();
1295         msleep(10);
1296
1297         /* Setup the HW Tx Head and Tail descriptor pointers */
1298         ew32(TDLEN(0), tx_ring->count * sizeof(union e1000_adv_tx_desc));
1299         tdba = tx_ring->dma;
1300         ew32(TDBAL(0), (tdba & DMA_BIT_MASK(32)));
1301         ew32(TDBAH(0), (tdba >> 32));
1302         ew32(TDH(0), 0);
1303         ew32(TDT(0), 0);
1304         tx_ring->head = E1000_TDH(0);
1305         tx_ring->tail = E1000_TDT(0);
1306
1307         /* Turn off Relaxed Ordering on head write-backs.  The writebacks
1308          * MUST be delivered in order or it will completely screw up
1309          * our bookkeeping.
1310          */
1311         dca_txctrl = er32(DCA_TXCTRL(0));
1312         dca_txctrl &= ~E1000_DCA_TXCTRL_TX_WB_RO_EN;
1313         ew32(DCA_TXCTRL(0), dca_txctrl);
1314
1315         /* enable transmits */
1316         txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
1317         ew32(TXDCTL(0), txdctl);
1318
1319         /* Setup Transmit Descriptor Settings for eop descriptor */
1320         adapter->txd_cmd = E1000_ADVTXD_DCMD_EOP | E1000_ADVTXD_DCMD_IFCS;
1321
1322         /* enable Report Status bit */
1323         adapter->txd_cmd |= E1000_ADVTXD_DCMD_RS;
1324 }
1325
1326 /**
1327  * igbvf_setup_srrctl - configure the receive control registers
1328  * @adapter: Board private structure
1329  **/
1330 static void igbvf_setup_srrctl(struct igbvf_adapter *adapter)
1331 {
1332         struct e1000_hw *hw = &adapter->hw;
1333         u32 srrctl = 0;
1334
1335         srrctl &= ~(E1000_SRRCTL_DESCTYPE_MASK |
1336                     E1000_SRRCTL_BSIZEHDR_MASK |
1337                     E1000_SRRCTL_BSIZEPKT_MASK);
1338
1339         /* Enable queue drop to avoid head of line blocking */
1340         srrctl |= E1000_SRRCTL_DROP_EN;
1341
1342         /* Setup buffer sizes */
1343         srrctl |= ALIGN(adapter->rx_buffer_len, 1024) >>
1344                   E1000_SRRCTL_BSIZEPKT_SHIFT;
1345
1346         if (adapter->rx_buffer_len < 2048) {
1347                 adapter->rx_ps_hdr_size = 0;
1348                 srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
1349         } else {
1350                 adapter->rx_ps_hdr_size = 128;
1351                 srrctl |= adapter->rx_ps_hdr_size <<
1352                           E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
1353                 srrctl |= E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
1354         }
1355
1356         ew32(SRRCTL(0), srrctl);
1357 }
1358
1359 /**
1360  * igbvf_configure_rx - Configure Receive Unit after Reset
1361  * @adapter: board private structure
1362  *
1363  * Configure the Rx unit of the MAC after a reset.
1364  **/
1365 static void igbvf_configure_rx(struct igbvf_adapter *adapter)
1366 {
1367         struct e1000_hw *hw = &adapter->hw;
1368         struct igbvf_ring *rx_ring = adapter->rx_ring;
1369         u64 rdba;
1370         u32 rxdctl;
1371
1372         /* disable receives */
1373         rxdctl = er32(RXDCTL(0));
1374         ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
1375         e1e_flush();
1376         msleep(10);
1377
1378         /* Setup the HW Rx Head and Tail Descriptor Pointers and
1379          * the Base and Length of the Rx Descriptor Ring
1380          */
1381         rdba = rx_ring->dma;
1382         ew32(RDBAL(0), (rdba & DMA_BIT_MASK(32)));
1383         ew32(RDBAH(0), (rdba >> 32));
1384         ew32(RDLEN(0), rx_ring->count * sizeof(union e1000_adv_rx_desc));
1385         rx_ring->head = E1000_RDH(0);
1386         rx_ring->tail = E1000_RDT(0);
1387         ew32(RDH(0), 0);
1388         ew32(RDT(0), 0);
1389
1390         rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
1391         rxdctl &= 0xFFF00000;
1392         rxdctl |= IGBVF_RX_PTHRESH;
1393         rxdctl |= IGBVF_RX_HTHRESH << 8;
1394         rxdctl |= IGBVF_RX_WTHRESH << 16;
1395
1396         igbvf_set_rlpml(adapter);
1397
1398         /* enable receives */
1399         ew32(RXDCTL(0), rxdctl);
1400 }
1401
1402 /**
1403  * igbvf_set_multi - Multicast and Promiscuous mode set
1404  * @netdev: network interface device structure
1405  *
1406  * The set_multi entry point is called whenever the multicast address
1407  * list or the network interface flags are updated.  This routine is
1408  * responsible for configuring the hardware for proper multicast,
1409  * promiscuous mode, and all-multi behavior.
1410  **/
1411 static void igbvf_set_multi(struct net_device *netdev)
1412 {
1413         struct igbvf_adapter *adapter = netdev_priv(netdev);
1414         struct e1000_hw *hw = &adapter->hw;
1415         struct netdev_hw_addr *ha;
1416         u8  *mta_list = NULL;
1417         int i;
1418
1419         if (!netdev_mc_empty(netdev)) {
1420                 mta_list = kmalloc_array(netdev_mc_count(netdev), ETH_ALEN,
1421                                          GFP_ATOMIC);
1422                 if (!mta_list)
1423                         return;
1424         }
1425
1426         /* prepare a packed array of only addresses. */
1427         i = 0;
1428         netdev_for_each_mc_addr(ha, netdev)
1429                 memcpy(mta_list + (i++ * ETH_ALEN), ha->addr, ETH_ALEN);
1430
1431         hw->mac.ops.update_mc_addr_list(hw, mta_list, i, 0, 0);
1432         kfree(mta_list);
1433 }
1434
1435 /**
1436  * igbvf_configure - configure the hardware for Rx and Tx
1437  * @adapter: private board structure
1438  **/
1439 static void igbvf_configure(struct igbvf_adapter *adapter)
1440 {
1441         igbvf_set_multi(adapter->netdev);
1442
1443         igbvf_restore_vlan(adapter);
1444
1445         igbvf_configure_tx(adapter);
1446         igbvf_setup_srrctl(adapter);
1447         igbvf_configure_rx(adapter);
1448         igbvf_alloc_rx_buffers(adapter->rx_ring,
1449                                igbvf_desc_unused(adapter->rx_ring));
1450 }
1451
1452 /* igbvf_reset - bring the hardware into a known good state
1453  * @adapter: private board structure
1454  *
1455  * This function boots the hardware and enables some settings that
1456  * require a configuration cycle of the hardware - those cannot be
1457  * set/changed during runtime. After reset the device needs to be
1458  * properly configured for Rx, Tx etc.
1459  */
1460 static void igbvf_reset(struct igbvf_adapter *adapter)
1461 {
1462         struct e1000_mac_info *mac = &adapter->hw.mac;
1463         struct net_device *netdev = adapter->netdev;
1464         struct e1000_hw *hw = &adapter->hw;
1465
1466         /* Allow time for pending master requests to run */
1467         if (mac->ops.reset_hw(hw))
1468                 dev_err(&adapter->pdev->dev, "PF still resetting\n");
1469
1470         mac->ops.init_hw(hw);
1471
1472         if (is_valid_ether_addr(adapter->hw.mac.addr)) {
1473                 memcpy(netdev->dev_addr, adapter->hw.mac.addr,
1474                        netdev->addr_len);
1475                 memcpy(netdev->perm_addr, adapter->hw.mac.addr,
1476                        netdev->addr_len);
1477         }
1478
1479         adapter->last_reset = jiffies;
1480 }
1481
1482 int igbvf_up(struct igbvf_adapter *adapter)
1483 {
1484         struct e1000_hw *hw = &adapter->hw;
1485
1486         /* hardware has been reset, we need to reload some things */
1487         igbvf_configure(adapter);
1488
1489         clear_bit(__IGBVF_DOWN, &adapter->state);
1490
1491         napi_enable(&adapter->rx_ring->napi);
1492         if (adapter->msix_entries)
1493                 igbvf_configure_msix(adapter);
1494
1495         /* Clear any pending interrupts. */
1496         er32(EICR);
1497         igbvf_irq_enable(adapter);
1498
1499         /* start the watchdog */
1500         hw->mac.get_link_status = 1;
1501         mod_timer(&adapter->watchdog_timer, jiffies + 1);
1502
1503         return 0;
1504 }
1505
1506 void igbvf_down(struct igbvf_adapter *adapter)
1507 {
1508         struct net_device *netdev = adapter->netdev;
1509         struct e1000_hw *hw = &adapter->hw;
1510         u32 rxdctl, txdctl;
1511
1512         /* signal that we're down so the interrupt handler does not
1513          * reschedule our watchdog timer
1514          */
1515         set_bit(__IGBVF_DOWN, &adapter->state);
1516
1517         /* disable receives in the hardware */
1518         rxdctl = er32(RXDCTL(0));
1519         ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
1520
1521         netif_carrier_off(netdev);
1522         netif_stop_queue(netdev);
1523
1524         /* disable transmits in the hardware */
1525         txdctl = er32(TXDCTL(0));
1526         ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
1527
1528         /* flush both disables and wait for them to finish */
1529         e1e_flush();
1530         msleep(10);
1531
1532         napi_disable(&adapter->rx_ring->napi);
1533
1534         igbvf_irq_disable(adapter);
1535
1536         del_timer_sync(&adapter->watchdog_timer);
1537
1538         /* record the stats before reset*/
1539         igbvf_update_stats(adapter);
1540
1541         adapter->link_speed = 0;
1542         adapter->link_duplex = 0;
1543
1544         igbvf_reset(adapter);
1545         igbvf_clean_tx_ring(adapter->tx_ring);
1546         igbvf_clean_rx_ring(adapter->rx_ring);
1547 }
1548
1549 void igbvf_reinit_locked(struct igbvf_adapter *adapter)
1550 {
1551         might_sleep();
1552         while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
1553                 usleep_range(1000, 2000);
1554         igbvf_down(adapter);
1555         igbvf_up(adapter);
1556         clear_bit(__IGBVF_RESETTING, &adapter->state);
1557 }
1558
1559 /**
1560  * igbvf_sw_init - Initialize general software structures (struct igbvf_adapter)
1561  * @adapter: board private structure to initialize
1562  *
1563  * igbvf_sw_init initializes the Adapter private data structure.
1564  * Fields are initialized based on PCI device information and
1565  * OS network device settings (MTU size).
1566  **/
1567 static int igbvf_sw_init(struct igbvf_adapter *adapter)
1568 {
1569         struct net_device *netdev = adapter->netdev;
1570         s32 rc;
1571
1572         adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
1573         adapter->rx_ps_hdr_size = 0;
1574         adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
1575         adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
1576
1577         adapter->tx_int_delay = 8;
1578         adapter->tx_abs_int_delay = 32;
1579         adapter->rx_int_delay = 0;
1580         adapter->rx_abs_int_delay = 8;
1581         adapter->requested_itr = 3;
1582         adapter->current_itr = IGBVF_START_ITR;
1583
1584         /* Set various function pointers */
1585         adapter->ei->init_ops(&adapter->hw);
1586
1587         rc = adapter->hw.mac.ops.init_params(&adapter->hw);
1588         if (rc)
1589                 return rc;
1590
1591         rc = adapter->hw.mbx.ops.init_params(&adapter->hw);
1592         if (rc)
1593                 return rc;
1594
1595         igbvf_set_interrupt_capability(adapter);
1596
1597         if (igbvf_alloc_queues(adapter))
1598                 return -ENOMEM;
1599
1600         spin_lock_init(&adapter->tx_queue_lock);
1601
1602         /* Explicitly disable IRQ since the NIC can be in any state. */
1603         igbvf_irq_disable(adapter);
1604
1605         spin_lock_init(&adapter->stats_lock);
1606
1607         set_bit(__IGBVF_DOWN, &adapter->state);
1608         return 0;
1609 }
1610
1611 static void igbvf_initialize_last_counter_stats(struct igbvf_adapter *adapter)
1612 {
1613         struct e1000_hw *hw = &adapter->hw;
1614
1615         adapter->stats.last_gprc = er32(VFGPRC);
1616         adapter->stats.last_gorc = er32(VFGORC);
1617         adapter->stats.last_gptc = er32(VFGPTC);
1618         adapter->stats.last_gotc = er32(VFGOTC);
1619         adapter->stats.last_mprc = er32(VFMPRC);
1620         adapter->stats.last_gotlbc = er32(VFGOTLBC);
1621         adapter->stats.last_gptlbc = er32(VFGPTLBC);
1622         adapter->stats.last_gorlbc = er32(VFGORLBC);
1623         adapter->stats.last_gprlbc = er32(VFGPRLBC);
1624
1625         adapter->stats.base_gprc = er32(VFGPRC);
1626         adapter->stats.base_gorc = er32(VFGORC);
1627         adapter->stats.base_gptc = er32(VFGPTC);
1628         adapter->stats.base_gotc = er32(VFGOTC);
1629         adapter->stats.base_mprc = er32(VFMPRC);
1630         adapter->stats.base_gotlbc = er32(VFGOTLBC);
1631         adapter->stats.base_gptlbc = er32(VFGPTLBC);
1632         adapter->stats.base_gorlbc = er32(VFGORLBC);
1633         adapter->stats.base_gprlbc = er32(VFGPRLBC);
1634 }
1635
1636 /**
1637  * igbvf_open - Called when a network interface is made active
1638  * @netdev: network interface device structure
1639  *
1640  * Returns 0 on success, negative value on failure
1641  *
1642  * The open entry point is called when a network interface is made
1643  * active by the system (IFF_UP).  At this point all resources needed
1644  * for transmit and receive operations are allocated, the interrupt
1645  * handler is registered with the OS, the watchdog timer is started,
1646  * and the stack is notified that the interface is ready.
1647  **/
1648 static int igbvf_open(struct net_device *netdev)
1649 {
1650         struct igbvf_adapter *adapter = netdev_priv(netdev);
1651         struct e1000_hw *hw = &adapter->hw;
1652         int err;
1653
1654         /* disallow open during test */
1655         if (test_bit(__IGBVF_TESTING, &adapter->state))
1656                 return -EBUSY;
1657
1658         /* allocate transmit descriptors */
1659         err = igbvf_setup_tx_resources(adapter, adapter->tx_ring);
1660         if (err)
1661                 goto err_setup_tx;
1662
1663         /* allocate receive descriptors */
1664         err = igbvf_setup_rx_resources(adapter, adapter->rx_ring);
1665         if (err)
1666                 goto err_setup_rx;
1667
1668         /* before we allocate an interrupt, we must be ready to handle it.
1669          * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
1670          * as soon as we call pci_request_irq, so we have to setup our
1671          * clean_rx handler before we do so.
1672          */
1673         igbvf_configure(adapter);
1674
1675         err = igbvf_request_irq(adapter);
1676         if (err)
1677                 goto err_req_irq;
1678
1679         /* From here on the code is the same as igbvf_up() */
1680         clear_bit(__IGBVF_DOWN, &adapter->state);
1681
1682         napi_enable(&adapter->rx_ring->napi);
1683
1684         /* clear any pending interrupts */
1685         er32(EICR);
1686
1687         igbvf_irq_enable(adapter);
1688
1689         /* start the watchdog */
1690         hw->mac.get_link_status = 1;
1691         mod_timer(&adapter->watchdog_timer, jiffies + 1);
1692
1693         return 0;
1694
1695 err_req_irq:
1696         igbvf_free_rx_resources(adapter->rx_ring);
1697 err_setup_rx:
1698         igbvf_free_tx_resources(adapter->tx_ring);
1699 err_setup_tx:
1700         igbvf_reset(adapter);
1701
1702         return err;
1703 }
1704
1705 /**
1706  * igbvf_close - Disables a network interface
1707  * @netdev: network interface device structure
1708  *
1709  * Returns 0, this is not allowed to fail
1710  *
1711  * The close entry point is called when an interface is de-activated
1712  * by the OS.  The hardware is still under the drivers control, but
1713  * needs to be disabled.  A global MAC reset is issued to stop the
1714  * hardware, and all transmit and receive resources are freed.
1715  **/
1716 static int igbvf_close(struct net_device *netdev)
1717 {
1718         struct igbvf_adapter *adapter = netdev_priv(netdev);
1719
1720         WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
1721         igbvf_down(adapter);
1722
1723         igbvf_free_irq(adapter);
1724
1725         igbvf_free_tx_resources(adapter->tx_ring);
1726         igbvf_free_rx_resources(adapter->rx_ring);
1727
1728         return 0;
1729 }
1730
1731 /**
1732  * igbvf_set_mac - Change the Ethernet Address of the NIC
1733  * @netdev: network interface device structure
1734  * @p: pointer to an address structure
1735  *
1736  * Returns 0 on success, negative on failure
1737  **/
1738 static int igbvf_set_mac(struct net_device *netdev, void *p)
1739 {
1740         struct igbvf_adapter *adapter = netdev_priv(netdev);
1741         struct e1000_hw *hw = &adapter->hw;
1742         struct sockaddr *addr = p;
1743
1744         if (!is_valid_ether_addr(addr->sa_data))
1745                 return -EADDRNOTAVAIL;
1746
1747         memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);
1748
1749         hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
1750
1751         if (!ether_addr_equal(addr->sa_data, hw->mac.addr))
1752                 return -EADDRNOTAVAIL;
1753
1754         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1755
1756         return 0;
1757 }
1758
1759 #define UPDATE_VF_COUNTER(reg, name) \
1760 { \
1761         u32 current_counter = er32(reg); \
1762         if (current_counter < adapter->stats.last_##name) \
1763                 adapter->stats.name += 0x100000000LL; \
1764         adapter->stats.last_##name = current_counter; \
1765         adapter->stats.name &= 0xFFFFFFFF00000000LL; \
1766         adapter->stats.name |= current_counter; \
1767 }
1768
1769 /**
1770  * igbvf_update_stats - Update the board statistics counters
1771  * @adapter: board private structure
1772 **/
1773 void igbvf_update_stats(struct igbvf_adapter *adapter)
1774 {
1775         struct e1000_hw *hw = &adapter->hw;
1776         struct pci_dev *pdev = adapter->pdev;
1777
1778         /* Prevent stats update while adapter is being reset, link is down
1779          * or if the pci connection is down.
1780          */
1781         if (adapter->link_speed == 0)
1782                 return;
1783
1784         if (test_bit(__IGBVF_RESETTING, &adapter->state))
1785                 return;
1786
1787         if (pci_channel_offline(pdev))
1788                 return;
1789
1790         UPDATE_VF_COUNTER(VFGPRC, gprc);
1791         UPDATE_VF_COUNTER(VFGORC, gorc);
1792         UPDATE_VF_COUNTER(VFGPTC, gptc);
1793         UPDATE_VF_COUNTER(VFGOTC, gotc);
1794         UPDATE_VF_COUNTER(VFMPRC, mprc);
1795         UPDATE_VF_COUNTER(VFGOTLBC, gotlbc);
1796         UPDATE_VF_COUNTER(VFGPTLBC, gptlbc);
1797         UPDATE_VF_COUNTER(VFGORLBC, gorlbc);
1798         UPDATE_VF_COUNTER(VFGPRLBC, gprlbc);
1799
1800         /* Fill out the OS statistics structure */
1801         adapter->net_stats.multicast = adapter->stats.mprc;
1802 }
1803
1804 static void igbvf_print_link_info(struct igbvf_adapter *adapter)
1805 {
1806         dev_info(&adapter->pdev->dev, "Link is Up %d Mbps %s Duplex\n",
1807                  adapter->link_speed,
1808                  adapter->link_duplex == FULL_DUPLEX ? "Full" : "Half");
1809 }
1810
1811 static bool igbvf_has_link(struct igbvf_adapter *adapter)
1812 {
1813         struct e1000_hw *hw = &adapter->hw;
1814         s32 ret_val = E1000_SUCCESS;
1815         bool link_active;
1816
1817         /* If interface is down, stay link down */
1818         if (test_bit(__IGBVF_DOWN, &adapter->state))
1819                 return false;
1820
1821         ret_val = hw->mac.ops.check_for_link(hw);
1822         link_active = !hw->mac.get_link_status;
1823
1824         /* if check for link returns error we will need to reset */
1825         if (ret_val && time_after(jiffies, adapter->last_reset + (10 * HZ)))
1826                 schedule_work(&adapter->reset_task);
1827
1828         return link_active;
1829 }
1830
1831 /**
1832  * igbvf_watchdog - Timer Call-back
1833  * @data: pointer to adapter cast into an unsigned long
1834  **/
1835 static void igbvf_watchdog(unsigned long data)
1836 {
1837         struct igbvf_adapter *adapter = (struct igbvf_adapter *)data;
1838
1839         /* Do the rest outside of interrupt context */
1840         schedule_work(&adapter->watchdog_task);
1841 }
1842
1843 static void igbvf_watchdog_task(struct work_struct *work)
1844 {
1845         struct igbvf_adapter *adapter = container_of(work,
1846                                                      struct igbvf_adapter,
1847                                                      watchdog_task);
1848         struct net_device *netdev = adapter->netdev;
1849         struct e1000_mac_info *mac = &adapter->hw.mac;
1850         struct igbvf_ring *tx_ring = adapter->tx_ring;
1851         struct e1000_hw *hw = &adapter->hw;
1852         u32 link;
1853         int tx_pending = 0;
1854
1855         link = igbvf_has_link(adapter);
1856
1857         if (link) {
1858                 if (!netif_carrier_ok(netdev)) {
1859                         mac->ops.get_link_up_info(&adapter->hw,
1860                                                   &adapter->link_speed,
1861                                                   &adapter->link_duplex);
1862                         igbvf_print_link_info(adapter);
1863
1864                         netif_carrier_on(netdev);
1865                         netif_wake_queue(netdev);
1866                 }
1867         } else {
1868                 if (netif_carrier_ok(netdev)) {
1869                         adapter->link_speed = 0;
1870                         adapter->link_duplex = 0;
1871                         dev_info(&adapter->pdev->dev, "Link is Down\n");
1872                         netif_carrier_off(netdev);
1873                         netif_stop_queue(netdev);
1874                 }
1875         }
1876
1877         if (netif_carrier_ok(netdev)) {
1878                 igbvf_update_stats(adapter);
1879         } else {
1880                 tx_pending = (igbvf_desc_unused(tx_ring) + 1 <
1881                               tx_ring->count);
1882                 if (tx_pending) {
1883                         /* We've lost link, so the controller stops DMA,
1884                          * but we've got queued Tx work that's never going
1885                          * to get done, so reset controller to flush Tx.
1886                          * (Do the reset outside of interrupt context).
1887                          */
1888                         adapter->tx_timeout_count++;
1889                         schedule_work(&adapter->reset_task);
1890                 }
1891         }
1892
1893         /* Cause software interrupt to ensure Rx ring is cleaned */
1894         ew32(EICS, adapter->rx_ring->eims_value);
1895
1896         /* Reset the timer */
1897         if (!test_bit(__IGBVF_DOWN, &adapter->state))
1898                 mod_timer(&adapter->watchdog_timer,
1899                           round_jiffies(jiffies + (2 * HZ)));
1900 }
1901
1902 #define IGBVF_TX_FLAGS_CSUM             0x00000001
1903 #define IGBVF_TX_FLAGS_VLAN             0x00000002
1904 #define IGBVF_TX_FLAGS_TSO              0x00000004
1905 #define IGBVF_TX_FLAGS_IPV4             0x00000008
1906 #define IGBVF_TX_FLAGS_VLAN_MASK        0xffff0000
1907 #define IGBVF_TX_FLAGS_VLAN_SHIFT       16
1908
1909 static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
1910                               u32 type_tucmd, u32 mss_l4len_idx)
1911 {
1912         struct e1000_adv_tx_context_desc *context_desc;
1913         struct igbvf_buffer *buffer_info;
1914         u16 i = tx_ring->next_to_use;
1915
1916         context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
1917         buffer_info = &tx_ring->buffer_info[i];
1918
1919         i++;
1920         tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
1921
1922         /* set bits to identify this as an advanced context descriptor */
1923         type_tucmd |= E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT;
1924
1925         context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
1926         context_desc->seqnum_seed       = 0;
1927         context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
1928         context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);
1929
1930         buffer_info->time_stamp = jiffies;
1931         buffer_info->dma = 0;
1932 }
1933
1934 static int igbvf_tso(struct igbvf_ring *tx_ring,
1935                      struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
1936 {
1937         u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
1938         union {
1939                 struct iphdr *v4;
1940                 struct ipv6hdr *v6;
1941                 unsigned char *hdr;
1942         } ip;
1943         union {
1944                 struct tcphdr *tcp;
1945                 unsigned char *hdr;
1946         } l4;
1947         u32 paylen, l4_offset;
1948         int err;
1949
1950         if (skb->ip_summed != CHECKSUM_PARTIAL)
1951                 return 0;
1952
1953         if (!skb_is_gso(skb))
1954                 return 0;
1955
1956         err = skb_cow_head(skb, 0);
1957         if (err < 0)
1958                 return err;
1959
1960         ip.hdr = skb_network_header(skb);
1961         l4.hdr = skb_checksum_start(skb);
1962
1963         /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
1964         type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
1965
1966         /* initialize outer IP header fields */
1967         if (ip.v4->version == 4) {
1968                 /* IP header will have to cancel out any data that
1969                  * is not a part of the outer IP header
1970                  */
1971                 ip.v4->check = csum_fold(csum_add(lco_csum(skb),
1972                                                   csum_unfold(l4.tcp->check)));
1973                 type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
1974
1975                 ip.v4->tot_len = 0;
1976         } else {
1977                 ip.v6->payload_len = 0;
1978         }
1979
1980         /* determine offset of inner transport header */
1981         l4_offset = l4.hdr - skb->data;
1982
1983         /* compute length of segmentation header */
1984         *hdr_len = (l4.tcp->doff * 4) + l4_offset;
1985
1986         /* remove payload length from inner checksum */
1987         paylen = skb->len - l4_offset;
1988         csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
1989
1990         /* MSS L4LEN IDX */
1991         mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
1992         mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;
1993
1994         /* VLAN MACLEN IPLEN */
1995         vlan_macip_lens = l4.hdr - ip.hdr;
1996         vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
1997         vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
1998
1999         igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);
2000
2001         return 1;
2002 }
2003
2004 static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
2005 {
2006         unsigned int offset = 0;
2007
2008         ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
2009
2010         return offset == skb_checksum_start_offset(skb);
2011 }
2012
2013 static bool igbvf_tx_csum(struct igbvf_ring *tx_ring, struct sk_buff *skb,
2014                           u32 tx_flags, __be16 protocol)
2015 {
2016         u32 vlan_macip_lens = 0;
2017         u32 type_tucmd = 0;
2018
2019         if (skb->ip_summed != CHECKSUM_PARTIAL) {
2020 csum_failed:
2021                 if (!(tx_flags & IGBVF_TX_FLAGS_VLAN))
2022                         return false;
2023                 goto no_csum;
2024         }
2025
2026         switch (skb->csum_offset) {
2027         case offsetof(struct tcphdr, check):
2028                 type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
2029                 /* fall through */
2030         case offsetof(struct udphdr, check):
2031                 break;
2032         case offsetof(struct sctphdr, checksum):
2033                 /* validate that this is actually an SCTP request */
2034                 if (((protocol == htons(ETH_P_IP)) &&
2035                      (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
2036                     ((protocol == htons(ETH_P_IPV6)) &&
2037                      igbvf_ipv6_csum_is_sctp(skb))) {
2038                         type_tucmd = E1000_ADVTXD_TUCMD_L4T_SCTP;
2039                         break;
2040                 }
2041         default:
2042                 skb_checksum_help(skb);
2043                 goto csum_failed;
2044         }
2045
2046         vlan_macip_lens = skb_checksum_start_offset(skb) -
2047                           skb_network_offset(skb);
2048 no_csum:
2049         vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT;
2050         vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
2051
2052         igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
2053         return true;
2054 }
2055
2056 static int igbvf_maybe_stop_tx(struct net_device *netdev, int size)
2057 {
2058         struct igbvf_adapter *adapter = netdev_priv(netdev);
2059
2060         /* there is enough descriptors then we don't need to worry  */
2061         if (igbvf_desc_unused(adapter->tx_ring) >= size)
2062                 return 0;
2063
2064         netif_stop_queue(netdev);
2065
2066         /* Herbert's original patch had:
2067          *  smp_mb__after_netif_stop_queue();
2068          * but since that doesn't exist yet, just open code it.
2069          */
2070         smp_mb();
2071
2072         /* We need to check again just in case room has been made available */
2073         if (igbvf_desc_unused(adapter->tx_ring) < size)
2074                 return -EBUSY;
2075
2076         netif_wake_queue(netdev);
2077
2078         ++adapter->restart_queue;
2079         return 0;
2080 }
2081
2082 #define IGBVF_MAX_TXD_PWR       16
2083 #define IGBVF_MAX_DATA_PER_TXD  (1u << IGBVF_MAX_TXD_PWR)
2084
2085 static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
2086                                    struct igbvf_ring *tx_ring,
2087                                    struct sk_buff *skb)
2088 {
2089         struct igbvf_buffer *buffer_info;
2090         struct pci_dev *pdev = adapter->pdev;
2091         unsigned int len = skb_headlen(skb);
2092         unsigned int count = 0, i;
2093         unsigned int f;
2094
2095         i = tx_ring->next_to_use;
2096
2097         buffer_info = &tx_ring->buffer_info[i];
2098         BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
2099         buffer_info->length = len;
2100         /* set time_stamp *before* dma to help avoid a possible race */
2101         buffer_info->time_stamp = jiffies;
2102         buffer_info->mapped_as_page = false;
2103         buffer_info->dma = dma_map_single(&pdev->dev, skb->data, len,
2104                                           DMA_TO_DEVICE);
2105         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2106                 goto dma_error;
2107
2108         for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
2109                 const struct skb_frag_struct *frag;
2110
2111                 count++;
2112                 i++;
2113                 if (i == tx_ring->count)
2114                         i = 0;
2115
2116                 frag = &skb_shinfo(skb)->frags[f];
2117                 len = skb_frag_size(frag);
2118
2119                 buffer_info = &tx_ring->buffer_info[i];
2120                 BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
2121                 buffer_info->length = len;
2122                 buffer_info->time_stamp = jiffies;
2123                 buffer_info->mapped_as_page = true;
2124                 buffer_info->dma = skb_frag_dma_map(&pdev->dev, frag, 0, len,
2125                                                     DMA_TO_DEVICE);
2126                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2127                         goto dma_error;
2128         }
2129
2130         tx_ring->buffer_info[i].skb = skb;
2131
2132         return ++count;
2133
2134 dma_error:
2135         dev_err(&pdev->dev, "TX DMA map failed\n");
2136
2137         /* clear timestamp and dma mappings for failed buffer_info mapping */
2138         buffer_info->dma = 0;
2139         buffer_info->time_stamp = 0;
2140         buffer_info->length = 0;
2141         buffer_info->mapped_as_page = false;
2142         if (count)
2143                 count--;
2144
2145         /* clear timestamp and dma mappings for remaining portion of packet */
2146         while (count--) {
2147                 if (i == 0)
2148                         i += tx_ring->count;
2149                 i--;
2150                 buffer_info = &tx_ring->buffer_info[i];
2151                 igbvf_put_txbuf(adapter, buffer_info);
2152         }
2153
2154         return 0;
2155 }
2156
2157 static inline void igbvf_tx_queue_adv(struct igbvf_adapter *adapter,
2158                                       struct igbvf_ring *tx_ring,
2159                                       int tx_flags, int count,
2160                                       unsigned int first, u32 paylen,
2161                                       u8 hdr_len)
2162 {
2163         union e1000_adv_tx_desc *tx_desc = NULL;
2164         struct igbvf_buffer *buffer_info;
2165         u32 olinfo_status = 0, cmd_type_len;
2166         unsigned int i;
2167
2168         cmd_type_len = (E1000_ADVTXD_DTYP_DATA | E1000_ADVTXD_DCMD_IFCS |
2169                         E1000_ADVTXD_DCMD_DEXT);
2170
2171         if (tx_flags & IGBVF_TX_FLAGS_VLAN)
2172                 cmd_type_len |= E1000_ADVTXD_DCMD_VLE;
2173
2174         if (tx_flags & IGBVF_TX_FLAGS_TSO) {
2175                 cmd_type_len |= E1000_ADVTXD_DCMD_TSE;
2176
2177                 /* insert tcp checksum */
2178                 olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
2179
2180                 /* insert ip checksum */
2181                 if (tx_flags & IGBVF_TX_FLAGS_IPV4)
2182                         olinfo_status |= E1000_TXD_POPTS_IXSM << 8;
2183
2184         } else if (tx_flags & IGBVF_TX_FLAGS_CSUM) {
2185                 olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
2186         }
2187
2188         olinfo_status |= ((paylen - hdr_len) << E1000_ADVTXD_PAYLEN_SHIFT);
2189
2190         i = tx_ring->next_to_use;
2191         while (count--) {
2192                 buffer_info = &tx_ring->buffer_info[i];
2193                 tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
2194                 tx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);
2195                 tx_desc->read.cmd_type_len =
2196                          cpu_to_le32(cmd_type_len | buffer_info->length);
2197                 tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
2198                 i++;
2199                 if (i == tx_ring->count)
2200                         i = 0;
2201         }
2202
2203         tx_desc->read.cmd_type_len |= cpu_to_le32(adapter->txd_cmd);
2204         /* Force memory writes to complete before letting h/w
2205          * know there are new descriptors to fetch.  (Only
2206          * applicable for weak-ordered memory model archs,
2207          * such as IA-64).
2208          */
2209         wmb();
2210
2211         tx_ring->buffer_info[first].next_to_watch = tx_desc;
2212         tx_ring->next_to_use = i;
2213         writel(i, adapter->hw.hw_addr + tx_ring->tail);
2214         /* we need this if more than one processor can write to our tail
2215          * at a time, it synchronizes IO on IA64/Altix systems
2216          */
2217         mmiowb();
2218 }
2219
2220 static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
2221                                              struct net_device *netdev,
2222                                              struct igbvf_ring *tx_ring)
2223 {
2224         struct igbvf_adapter *adapter = netdev_priv(netdev);
2225         unsigned int first, tx_flags = 0;
2226         u8 hdr_len = 0;
2227         int count = 0;
2228         int tso = 0;
2229         __be16 protocol = vlan_get_protocol(skb);
2230
2231         if (test_bit(__IGBVF_DOWN, &adapter->state)) {
2232                 dev_kfree_skb_any(skb);
2233                 return NETDEV_TX_OK;
2234         }
2235
2236         if (skb->len <= 0) {
2237                 dev_kfree_skb_any(skb);
2238                 return NETDEV_TX_OK;
2239         }
2240
2241         /* need: count + 4 desc gap to keep tail from touching
2242          *       + 2 desc gap to keep tail from touching head,
2243          *       + 1 desc for skb->data,
2244          *       + 1 desc for context descriptor,
2245          * head, otherwise try next time
2246          */
2247         if (igbvf_maybe_stop_tx(netdev, skb_shinfo(skb)->nr_frags + 4)) {
2248                 /* this is a hard error */
2249                 return NETDEV_TX_BUSY;
2250         }
2251
2252         if (skb_vlan_tag_present(skb)) {
2253                 tx_flags |= IGBVF_TX_FLAGS_VLAN;
2254                 tx_flags |= (skb_vlan_tag_get(skb) <<
2255                              IGBVF_TX_FLAGS_VLAN_SHIFT);
2256         }
2257
2258         if (protocol == htons(ETH_P_IP))
2259                 tx_flags |= IGBVF_TX_FLAGS_IPV4;
2260
2261         first = tx_ring->next_to_use;
2262
2263         tso = igbvf_tso(tx_ring, skb, tx_flags, &hdr_len);
2264         if (unlikely(tso < 0)) {
2265                 dev_kfree_skb_any(skb);
2266                 return NETDEV_TX_OK;
2267         }
2268
2269         if (tso)
2270                 tx_flags |= IGBVF_TX_FLAGS_TSO;
2271         else if (igbvf_tx_csum(tx_ring, skb, tx_flags, protocol) &&
2272                  (skb->ip_summed == CHECKSUM_PARTIAL))
2273                 tx_flags |= IGBVF_TX_FLAGS_CSUM;
2274
2275         /* count reflects descriptors mapped, if 0 then mapping error
2276          * has occurred and we need to rewind the descriptor queue
2277          */
2278         count = igbvf_tx_map_adv(adapter, tx_ring, skb);
2279
2280         if (count) {
2281                 igbvf_tx_queue_adv(adapter, tx_ring, tx_flags, count,
2282                                    first, skb->len, hdr_len);
2283                 /* Make sure there is space in the ring for the next send. */
2284                 igbvf_maybe_stop_tx(netdev, MAX_SKB_FRAGS + 4);
2285         } else {
2286                 dev_kfree_skb_any(skb);
2287                 tx_ring->buffer_info[first].time_stamp = 0;
2288                 tx_ring->next_to_use = first;
2289         }
2290
2291         return NETDEV_TX_OK;
2292 }
2293
2294 static netdev_tx_t igbvf_xmit_frame(struct sk_buff *skb,
2295                                     struct net_device *netdev)
2296 {
2297         struct igbvf_adapter *adapter = netdev_priv(netdev);
2298         struct igbvf_ring *tx_ring;
2299
2300         if (test_bit(__IGBVF_DOWN, &adapter->state)) {
2301                 dev_kfree_skb_any(skb);
2302                 return NETDEV_TX_OK;
2303         }
2304
2305         tx_ring = &adapter->tx_ring[0];
2306
2307         return igbvf_xmit_frame_ring_adv(skb, netdev, tx_ring);
2308 }
2309
2310 /**
2311  * igbvf_tx_timeout - Respond to a Tx Hang
2312  * @netdev: network interface device structure
2313  **/
2314 static void igbvf_tx_timeout(struct net_device *netdev)
2315 {
2316         struct igbvf_adapter *adapter = netdev_priv(netdev);
2317
2318         /* Do the reset outside of interrupt context */
2319         adapter->tx_timeout_count++;
2320         schedule_work(&adapter->reset_task);
2321 }
2322
2323 static void igbvf_reset_task(struct work_struct *work)
2324 {
2325         struct igbvf_adapter *adapter;
2326
2327         adapter = container_of(work, struct igbvf_adapter, reset_task);
2328
2329         igbvf_reinit_locked(adapter);
2330 }
2331
2332 /**
2333  * igbvf_get_stats - Get System Network Statistics
2334  * @netdev: network interface device structure
2335  *
2336  * Returns the address of the device statistics structure.
2337  * The statistics are actually updated from the timer callback.
2338  **/
2339 static struct net_device_stats *igbvf_get_stats(struct net_device *netdev)
2340 {
2341         struct igbvf_adapter *adapter = netdev_priv(netdev);
2342
2343         /* only return the current stats */
2344         return &adapter->net_stats;
2345 }
2346
2347 /**
2348  * igbvf_change_mtu - Change the Maximum Transfer Unit
2349  * @netdev: network interface device structure
2350  * @new_mtu: new value for maximum frame size
2351  *
2352  * Returns 0 on success, negative on failure
2353  **/
2354 static int igbvf_change_mtu(struct net_device *netdev, int new_mtu)
2355 {
2356         struct igbvf_adapter *adapter = netdev_priv(netdev);
2357         int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
2358
2359         if (new_mtu < 68 || new_mtu > INT_MAX - ETH_HLEN - ETH_FCS_LEN ||
2360             max_frame > MAX_JUMBO_FRAME_SIZE)
2361                 return -EINVAL;
2362
2363 #define MAX_STD_JUMBO_FRAME_SIZE 9234
2364         if (max_frame > MAX_STD_JUMBO_FRAME_SIZE) {
2365                 dev_err(&adapter->pdev->dev, "MTU > 9216 not supported.\n");
2366                 return -EINVAL;
2367         }
2368
2369         while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
2370                 usleep_range(1000, 2000);
2371         /* igbvf_down has a dependency on max_frame_size */
2372         adapter->max_frame_size = max_frame;
2373         if (netif_running(netdev))
2374                 igbvf_down(adapter);
2375
2376         /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
2377          * means we reserve 2 more, this pushes us to allocate from the next
2378          * larger slab size.
2379          * i.e. RXBUFFER_2048 --> size-4096 slab
2380          * However with the new *_jumbo_rx* routines, jumbo receives will use
2381          * fragmented skbs
2382          */
2383
2384         if (max_frame <= 1024)
2385                 adapter->rx_buffer_len = 1024;
2386         else if (max_frame <= 2048)
2387                 adapter->rx_buffer_len = 2048;
2388         else
2389 #if (PAGE_SIZE / 2) > 16384
2390                 adapter->rx_buffer_len = 16384;
2391 #else
2392                 adapter->rx_buffer_len = PAGE_SIZE / 2;
2393 #endif
2394
2395         /* adjust allocation if LPE protects us, and we aren't using SBP */
2396         if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
2397             (max_frame == ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN))
2398                 adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN +
2399                                          ETH_FCS_LEN;
2400
2401         dev_info(&adapter->pdev->dev, "changing MTU from %d to %d\n",
2402                  netdev->mtu, new_mtu);
2403         netdev->mtu = new_mtu;
2404
2405         if (netif_running(netdev))
2406                 igbvf_up(adapter);
2407         else
2408                 igbvf_reset(adapter);
2409
2410         clear_bit(__IGBVF_RESETTING, &adapter->state);
2411
2412         return 0;
2413 }
2414
2415 static int igbvf_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
2416 {
2417         switch (cmd) {
2418         default:
2419                 return -EOPNOTSUPP;
2420         }
2421 }
2422
2423 static int igbvf_suspend(struct pci_dev *pdev, pm_message_t state)
2424 {
2425         struct net_device *netdev = pci_get_drvdata(pdev);
2426         struct igbvf_adapter *adapter = netdev_priv(netdev);
2427 #ifdef CONFIG_PM
2428         int retval = 0;
2429 #endif
2430
2431         netif_device_detach(netdev);
2432
2433         if (netif_running(netdev)) {
2434                 WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
2435                 igbvf_down(adapter);
2436                 igbvf_free_irq(adapter);
2437         }
2438
2439 #ifdef CONFIG_PM
2440         retval = pci_save_state(pdev);
2441         if (retval)
2442                 return retval;
2443 #endif
2444
2445         pci_disable_device(pdev);
2446
2447         return 0;
2448 }
2449
2450 #ifdef CONFIG_PM
2451 static int igbvf_resume(struct pci_dev *pdev)
2452 {
2453         struct net_device *netdev = pci_get_drvdata(pdev);
2454         struct igbvf_adapter *adapter = netdev_priv(netdev);
2455         u32 err;
2456
2457         pci_restore_state(pdev);
2458         err = pci_enable_device_mem(pdev);
2459         if (err) {
2460                 dev_err(&pdev->dev, "Cannot enable PCI device from suspend\n");
2461                 return err;
2462         }
2463
2464         pci_set_master(pdev);
2465
2466         if (netif_running(netdev)) {
2467                 err = igbvf_request_irq(adapter);
2468                 if (err)
2469                         return err;
2470         }
2471
2472         igbvf_reset(adapter);
2473
2474         if (netif_running(netdev))
2475                 igbvf_up(adapter);
2476
2477         netif_device_attach(netdev);
2478
2479         return 0;
2480 }
2481 #endif
2482
2483 static void igbvf_shutdown(struct pci_dev *pdev)
2484 {
2485         igbvf_suspend(pdev, PMSG_SUSPEND);
2486 }
2487
2488 #ifdef CONFIG_NET_POLL_CONTROLLER
2489 /* Polling 'interrupt' - used by things like netconsole to send skbs
2490  * without having to re-enable interrupts. It's not called while
2491  * the interrupt routine is executing.
2492  */
2493 static void igbvf_netpoll(struct net_device *netdev)
2494 {
2495         struct igbvf_adapter *adapter = netdev_priv(netdev);
2496
2497         disable_irq(adapter->pdev->irq);
2498
2499         igbvf_clean_tx_irq(adapter->tx_ring);
2500
2501         enable_irq(adapter->pdev->irq);
2502 }
2503 #endif
2504
2505 /**
2506  * igbvf_io_error_detected - called when PCI error is detected
2507  * @pdev: Pointer to PCI device
2508  * @state: The current pci connection state
2509  *
2510  * This function is called after a PCI bus error affecting
2511  * this device has been detected.
2512  */
2513 static pci_ers_result_t igbvf_io_error_detected(struct pci_dev *pdev,
2514                                                 pci_channel_state_t state)
2515 {
2516         struct net_device *netdev = pci_get_drvdata(pdev);
2517         struct igbvf_adapter *adapter = netdev_priv(netdev);
2518
2519         netif_device_detach(netdev);
2520
2521         if (state == pci_channel_io_perm_failure)
2522                 return PCI_ERS_RESULT_DISCONNECT;
2523
2524         if (netif_running(netdev))
2525                 igbvf_down(adapter);
2526         pci_disable_device(pdev);
2527
2528         /* Request a slot slot reset. */
2529         return PCI_ERS_RESULT_NEED_RESET;
2530 }
2531
2532 /**
2533  * igbvf_io_slot_reset - called after the pci bus has been reset.
2534  * @pdev: Pointer to PCI device
2535  *
2536  * Restart the card from scratch, as if from a cold-boot. Implementation
2537  * resembles the first-half of the igbvf_resume routine.
2538  */
2539 static pci_ers_result_t igbvf_io_slot_reset(struct pci_dev *pdev)
2540 {
2541         struct net_device *netdev = pci_get_drvdata(pdev);
2542         struct igbvf_adapter *adapter = netdev_priv(netdev);
2543
2544         if (pci_enable_device_mem(pdev)) {
2545                 dev_err(&pdev->dev,
2546                         "Cannot re-enable PCI device after reset.\n");
2547                 return PCI_ERS_RESULT_DISCONNECT;
2548         }
2549         pci_set_master(pdev);
2550
2551         igbvf_reset(adapter);
2552
2553         return PCI_ERS_RESULT_RECOVERED;
2554 }
2555
2556 /**
2557  * igbvf_io_resume - called when traffic can start flowing again.
2558  * @pdev: Pointer to PCI device
2559  *
2560  * This callback is called when the error recovery driver tells us that
2561  * its OK to resume normal operation. Implementation resembles the
2562  * second-half of the igbvf_resume routine.
2563  */
2564 static void igbvf_io_resume(struct pci_dev *pdev)
2565 {
2566         struct net_device *netdev = pci_get_drvdata(pdev);
2567         struct igbvf_adapter *adapter = netdev_priv(netdev);
2568
2569         if (netif_running(netdev)) {
2570                 if (igbvf_up(adapter)) {
2571                         dev_err(&pdev->dev,
2572                                 "can't bring device back up after reset\n");
2573                         return;
2574                 }
2575         }
2576
2577         netif_device_attach(netdev);
2578 }
2579
2580 static void igbvf_print_device_info(struct igbvf_adapter *adapter)
2581 {
2582         struct e1000_hw *hw = &adapter->hw;
2583         struct net_device *netdev = adapter->netdev;
2584         struct pci_dev *pdev = adapter->pdev;
2585
2586         if (hw->mac.type == e1000_vfadapt_i350)
2587                 dev_info(&pdev->dev, "Intel(R) I350 Virtual Function\n");
2588         else
2589                 dev_info(&pdev->dev, "Intel(R) 82576 Virtual Function\n");
2590         dev_info(&pdev->dev, "Address: %pM\n", netdev->dev_addr);
2591 }
2592
2593 static int igbvf_set_features(struct net_device *netdev,
2594                               netdev_features_t features)
2595 {
2596         struct igbvf_adapter *adapter = netdev_priv(netdev);
2597
2598         if (features & NETIF_F_RXCSUM)
2599                 adapter->flags &= ~IGBVF_FLAG_RX_CSUM_DISABLED;
2600         else
2601                 adapter->flags |= IGBVF_FLAG_RX_CSUM_DISABLED;
2602
2603         return 0;
2604 }
2605
2606 #define IGBVF_MAX_MAC_HDR_LEN           127
2607 #define IGBVF_MAX_NETWORK_HDR_LEN       511
2608
2609 static netdev_features_t
2610 igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
2611                      netdev_features_t features)
2612 {
2613         unsigned int network_hdr_len, mac_hdr_len;
2614
2615         /* Make certain the headers can be described by a context descriptor */
2616         mac_hdr_len = skb_network_header(skb) - skb->data;
2617         if (unlikely(mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN))
2618                 return features & ~(NETIF_F_HW_CSUM |
2619                                     NETIF_F_SCTP_CRC |
2620                                     NETIF_F_HW_VLAN_CTAG_TX |
2621                                     NETIF_F_TSO |
2622                                     NETIF_F_TSO6);
2623
2624         network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
2625         if (unlikely(network_hdr_len >  IGBVF_MAX_NETWORK_HDR_LEN))
2626                 return features & ~(NETIF_F_HW_CSUM |
2627                                     NETIF_F_SCTP_CRC |
2628                                     NETIF_F_TSO |
2629                                     NETIF_F_TSO6);
2630
2631         /* We can only support IPV4 TSO in tunnels if we can mangle the
2632          * inner IP ID field, so strip TSO if MANGLEID is not supported.
2633          */
2634         if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
2635                 features &= ~NETIF_F_TSO;
2636
2637         return features;
2638 }
2639
2640 static const struct net_device_ops igbvf_netdev_ops = {
2641         .ndo_open               = igbvf_open,
2642         .ndo_stop               = igbvf_close,
2643         .ndo_start_xmit         = igbvf_xmit_frame,
2644         .ndo_get_stats          = igbvf_get_stats,
2645         .ndo_set_rx_mode        = igbvf_set_multi,
2646         .ndo_set_mac_address    = igbvf_set_mac,
2647         .ndo_change_mtu         = igbvf_change_mtu,
2648         .ndo_do_ioctl           = igbvf_ioctl,
2649         .ndo_tx_timeout         = igbvf_tx_timeout,
2650         .ndo_vlan_rx_add_vid    = igbvf_vlan_rx_add_vid,
2651         .ndo_vlan_rx_kill_vid   = igbvf_vlan_rx_kill_vid,
2652 #ifdef CONFIG_NET_POLL_CONTROLLER
2653         .ndo_poll_controller    = igbvf_netpoll,
2654 #endif
2655         .ndo_set_features       = igbvf_set_features,
2656         .ndo_features_check     = igbvf_features_check,
2657 };
2658
2659 /**
2660  * igbvf_probe - Device Initialization Routine
2661  * @pdev: PCI device information struct
2662  * @ent: entry in igbvf_pci_tbl
2663  *
2664  * Returns 0 on success, negative on failure
2665  *
2666  * igbvf_probe initializes an adapter identified by a pci_dev structure.
2667  * The OS initialization, configuring of the adapter private structure,
2668  * and a hardware reset occur.
2669  **/
2670 static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2671 {
2672         struct net_device *netdev;
2673         struct igbvf_adapter *adapter;
2674         struct e1000_hw *hw;
2675         const struct igbvf_info *ei = igbvf_info_tbl[ent->driver_data];
2676
2677         static int cards_found;
2678         int err, pci_using_dac;
2679
2680         err = pci_enable_device_mem(pdev);
2681         if (err)
2682                 return err;
2683
2684         pci_using_dac = 0;
2685         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
2686         if (!err) {
2687                 pci_using_dac = 1;
2688         } else {
2689                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
2690                 if (err) {
2691                         dev_err(&pdev->dev,
2692                                 "No usable DMA configuration, aborting\n");
2693                         goto err_dma;
2694                 }
2695         }
2696
2697         err = pci_request_regions(pdev, igbvf_driver_name);
2698         if (err)
2699                 goto err_pci_reg;
2700
2701         pci_set_master(pdev);
2702
2703         err = -ENOMEM;
2704         netdev = alloc_etherdev(sizeof(struct igbvf_adapter));
2705         if (!netdev)
2706                 goto err_alloc_etherdev;
2707
2708         SET_NETDEV_DEV(netdev, &pdev->dev);
2709
2710         pci_set_drvdata(pdev, netdev);
2711         adapter = netdev_priv(netdev);
2712         hw = &adapter->hw;
2713         adapter->netdev = netdev;
2714         adapter->pdev = pdev;
2715         adapter->ei = ei;
2716         adapter->pba = ei->pba;
2717         adapter->flags = ei->flags;
2718         adapter->hw.back = adapter;
2719         adapter->hw.mac.type = ei->mac;
2720         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2721
2722         /* PCI config space info */
2723
2724         hw->vendor_id = pdev->vendor;
2725         hw->device_id = pdev->device;
2726         hw->subsystem_vendor_id = pdev->subsystem_vendor;
2727         hw->subsystem_device_id = pdev->subsystem_device;
2728         hw->revision_id = pdev->revision;
2729
2730         err = -EIO;
2731         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0),
2732                                       pci_resource_len(pdev, 0));
2733
2734         if (!adapter->hw.hw_addr)
2735                 goto err_ioremap;
2736
2737         if (ei->get_variants) {
2738                 err = ei->get_variants(adapter);
2739                 if (err)
2740                         goto err_get_variants;
2741         }
2742
2743         /* setup adapter struct */
2744         err = igbvf_sw_init(adapter);
2745         if (err)
2746                 goto err_sw_init;
2747
2748         /* construct the net_device struct */
2749         netdev->netdev_ops = &igbvf_netdev_ops;
2750
2751         igbvf_set_ethtool_ops(netdev);
2752         netdev->watchdog_timeo = 5 * HZ;
2753         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
2754
2755         adapter->bd_number = cards_found++;
2756
2757         netdev->hw_features = NETIF_F_SG |
2758                               NETIF_F_TSO |
2759                               NETIF_F_TSO6 |
2760                               NETIF_F_RXCSUM |
2761                               NETIF_F_HW_CSUM |
2762                               NETIF_F_SCTP_CRC;
2763
2764 #define IGBVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
2765                                     NETIF_F_GSO_GRE_CSUM | \
2766                                     NETIF_F_GSO_IPXIP4 | \
2767                                     NETIF_F_GSO_IPXIP6 | \
2768                                     NETIF_F_GSO_UDP_TUNNEL | \
2769                                     NETIF_F_GSO_UDP_TUNNEL_CSUM)
2770
2771         netdev->gso_partial_features = IGBVF_GSO_PARTIAL_FEATURES;
2772         netdev->hw_features |= NETIF_F_GSO_PARTIAL |
2773                                IGBVF_GSO_PARTIAL_FEATURES;
2774
2775         netdev->features = netdev->hw_features;
2776
2777         if (pci_using_dac)
2778                 netdev->features |= NETIF_F_HIGHDMA;
2779
2780         netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
2781         netdev->mpls_features |= NETIF_F_HW_CSUM;
2782         netdev->hw_enc_features |= netdev->vlan_features;
2783
2784         /* set this bit last since it cannot be part of vlan_features */
2785         netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
2786                             NETIF_F_HW_VLAN_CTAG_RX |
2787                             NETIF_F_HW_VLAN_CTAG_TX;
2788
2789         /*reset the controller to put the device in a known good state */
2790         err = hw->mac.ops.reset_hw(hw);
2791         if (err) {
2792                 dev_info(&pdev->dev,
2793                          "PF still in reset state. Is the PF interface up?\n");
2794         } else {
2795                 err = hw->mac.ops.read_mac_addr(hw);
2796                 if (err)
2797                         dev_info(&pdev->dev, "Error reading MAC address.\n");
2798                 else if (is_zero_ether_addr(adapter->hw.mac.addr))
2799                         dev_info(&pdev->dev,
2800                                  "MAC address not assigned by administrator.\n");
2801                 memcpy(netdev->dev_addr, adapter->hw.mac.addr,
2802                        netdev->addr_len);
2803         }
2804
2805         if (!is_valid_ether_addr(netdev->dev_addr)) {
2806                 dev_info(&pdev->dev, "Assigning random MAC address.\n");
2807                 eth_hw_addr_random(netdev);
2808                 memcpy(adapter->hw.mac.addr, netdev->dev_addr,
2809                        netdev->addr_len);
2810         }
2811
2812         setup_timer(&adapter->watchdog_timer, &igbvf_watchdog,
2813                     (unsigned long)adapter);
2814
2815         INIT_WORK(&adapter->reset_task, igbvf_reset_task);
2816         INIT_WORK(&adapter->watchdog_task, igbvf_watchdog_task);
2817
2818         /* ring size defaults */
2819         adapter->rx_ring->count = 1024;
2820         adapter->tx_ring->count = 1024;
2821
2822         /* reset the hardware with the new settings */
2823         igbvf_reset(adapter);
2824
2825         /* set hardware-specific flags */
2826         if (adapter->hw.mac.type == e1000_vfadapt_i350)
2827                 adapter->flags |= IGBVF_FLAG_RX_LB_VLAN_BSWAP;
2828
2829         strcpy(netdev->name, "eth%d");
2830         err = register_netdev(netdev);
2831         if (err)
2832                 goto err_hw_init;
2833
2834         /* tell the stack to leave us alone until igbvf_open() is called */
2835         netif_carrier_off(netdev);
2836         netif_stop_queue(netdev);
2837
2838         igbvf_print_device_info(adapter);
2839
2840         igbvf_initialize_last_counter_stats(adapter);
2841
2842         return 0;
2843
2844 err_hw_init:
2845         kfree(adapter->tx_ring);
2846         kfree(adapter->rx_ring);
2847 err_sw_init:
2848         igbvf_reset_interrupt_capability(adapter);
2849 err_get_variants:
2850         iounmap(adapter->hw.hw_addr);
2851 err_ioremap:
2852         free_netdev(netdev);
2853 err_alloc_etherdev:
2854         pci_release_regions(pdev);
2855 err_pci_reg:
2856 err_dma:
2857         pci_disable_device(pdev);
2858         return err;
2859 }
2860
2861 /**
2862  * igbvf_remove - Device Removal Routine
2863  * @pdev: PCI device information struct
2864  *
2865  * igbvf_remove is called by the PCI subsystem to alert the driver
2866  * that it should release a PCI device.  The could be caused by a
2867  * Hot-Plug event, or because the driver is going to be removed from
2868  * memory.
2869  **/
2870 static void igbvf_remove(struct pci_dev *pdev)
2871 {
2872         struct net_device *netdev = pci_get_drvdata(pdev);
2873         struct igbvf_adapter *adapter = netdev_priv(netdev);
2874         struct e1000_hw *hw = &adapter->hw;
2875
2876         /* The watchdog timer may be rescheduled, so explicitly
2877          * disable it from being rescheduled.
2878          */
2879         set_bit(__IGBVF_DOWN, &adapter->state);
2880         del_timer_sync(&adapter->watchdog_timer);
2881
2882         cancel_work_sync(&adapter->reset_task);
2883         cancel_work_sync(&adapter->watchdog_task);
2884
2885         unregister_netdev(netdev);
2886
2887         igbvf_reset_interrupt_capability(adapter);
2888
2889         /* it is important to delete the NAPI struct prior to freeing the
2890          * Rx ring so that you do not end up with null pointer refs
2891          */
2892         netif_napi_del(&adapter->rx_ring->napi);
2893         kfree(adapter->tx_ring);
2894         kfree(adapter->rx_ring);
2895
2896         iounmap(hw->hw_addr);
2897         if (hw->flash_address)
2898                 iounmap(hw->flash_address);
2899         pci_release_regions(pdev);
2900
2901         free_netdev(netdev);
2902
2903         pci_disable_device(pdev);
2904 }
2905
2906 /* PCI Error Recovery (ERS) */
2907 static const struct pci_error_handlers igbvf_err_handler = {
2908         .error_detected = igbvf_io_error_detected,
2909         .slot_reset = igbvf_io_slot_reset,
2910         .resume = igbvf_io_resume,
2911 };
2912
2913 static const struct pci_device_id igbvf_pci_tbl[] = {
2914         { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_VF), board_vf },
2915         { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_VF), board_i350_vf },
2916         { } /* terminate list */
2917 };
2918 MODULE_DEVICE_TABLE(pci, igbvf_pci_tbl);
2919
2920 /* PCI Device API Driver */
2921 static struct pci_driver igbvf_driver = {
2922         .name           = igbvf_driver_name,
2923         .id_table       = igbvf_pci_tbl,
2924         .probe          = igbvf_probe,
2925         .remove         = igbvf_remove,
2926 #ifdef CONFIG_PM
2927         /* Power Management Hooks */
2928         .suspend        = igbvf_suspend,
2929         .resume         = igbvf_resume,
2930 #endif
2931         .shutdown       = igbvf_shutdown,
2932         .err_handler    = &igbvf_err_handler
2933 };
2934
2935 /**
2936  * igbvf_init_module - Driver Registration Routine
2937  *
2938  * igbvf_init_module is the first routine called when the driver is
2939  * loaded. All it does is register with the PCI subsystem.
2940  **/
2941 static int __init igbvf_init_module(void)
2942 {
2943         int ret;
2944
2945         pr_info("%s - version %s\n", igbvf_driver_string, igbvf_driver_version);
2946         pr_info("%s\n", igbvf_copyright);
2947
2948         ret = pci_register_driver(&igbvf_driver);
2949
2950         return ret;
2951 }
2952 module_init(igbvf_init_module);
2953
2954 /**
2955  * igbvf_exit_module - Driver Exit Cleanup Routine
2956  *
2957  * igbvf_exit_module is called just before the driver is removed
2958  * from memory.
2959  **/
2960 static void __exit igbvf_exit_module(void)
2961 {
2962         pci_unregister_driver(&igbvf_driver);
2963 }
2964 module_exit(igbvf_exit_module);
2965
2966 MODULE_AUTHOR("Intel Corporation, <e1000-devel@lists.sourceforge.net>");
2967 MODULE_DESCRIPTION("Intel(R) Gigabit Virtual Function Network Driver");
2968 MODULE_LICENSE("GPL");
2969 MODULE_VERSION(DRV_VERSION);
2970
2971 /* netdev.c */