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

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
igbvf_desc_unused
igbvf_receive_skb
igbvf_rx_checksum_adv
igbvf_alloc_rx_buffers
igbvf_clean_rx_irq
igbvf_put_txbuf
igbvf_setup_tx_resources
igbvf_setup_rx_resources
igbvf_clean_tx_ring
igbvf_free_tx_resources
igbvf_clean_rx_ring
igbvf_free_rx_resources
igbvf_update_itr
igbvf_range_to_itr
igbvf_set_itr
igbvf_clean_tx_irq
igbvf_msix_other
igbvf_intr_msix_tx
igbvf_intr_msix_rx
igbvf_assign_vector
igbvf_configure_msix
igbvf_reset_interrupt_capability
igbvf_set_interrupt_capability
igbvf_request_msix
igbvf_alloc_queues
igbvf_request_irq
igbvf_free_irq
igbvf_irq_disable
igbvf_irq_enable
igbvf_poll
igbvf_set_rlpml
igbvf_vlan_rx_add_vid
igbvf_vlan_rx_kill_vid
igbvf_restore_vlan
igbvf_configure_tx
igbvf_setup_srrctl
igbvf_configure_rx
igbvf_set_multi
igbvf_set_uni
igbvf_set_rx_mode
igbvf_configure
igbvf_reset
igbvf_up
igbvf_down
igbvf_reinit_locked
igbvf_sw_init
igbvf_initialize_last_counter_stats
igbvf_open
igbvf_close
igbvf_set_mac
igbvf_update_stats
igbvf_print_link_info
igbvf_has_link
igbvf_watchdog
igbvf_watchdog_task
igbvf_tx_ctxtdesc
igbvf_tso
igbvf_ipv6_csum_is_sctp
igbvf_tx_csum
igbvf_maybe_stop_tx
igbvf_tx_map_adv
igbvf_tx_queue_adv
igbvf_xmit_frame_ring_adv
igbvf_xmit_frame
igbvf_tx_timeout
igbvf_reset_task
igbvf_change_mtu
igbvf_ioctl
igbvf_suspend
igbvf_resume
igbvf_shutdown
igbvf_netpoll
igbvf_io_error_detected
igbvf_io_slot_reset
igbvf_io_resume
igbvf_print_device_info
igbvf_set_features
igbvf_features_check
igbvf_probe
igbvf_remove
igbvf_init_module
igbvf_exit_module
   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2009 - 2018 Intel Corporation. */
   3 
   4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   5 
   6 #include <linux/module.h>
   7 #include <linux/types.h>
   8 #include <linux/init.h>
   9 #include <linux/pci.h>
  10 #include <linux/vmalloc.h>
  11 #include <linux/pagemap.h>
  12 #include <linux/delay.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/tcp.h>
  15 #include <linux/ipv6.h>
  16 #include <linux/slab.h>
  17 #include <net/checksum.h>
  18 #include <net/ip6_checksum.h>
  19 #include <linux/mii.h>
  20 #include <linux/ethtool.h>
  21 #include <linux/if_vlan.h>
  22 #include <linux/prefetch.h>
  23 #include <linux/sctp.h>
  24 
  25 #include "igbvf.h"
  26 
  27 #define DRV_VERSION "2.4.0-k"
  28 char igbvf_driver_name[] = "igbvf";
  29 const char igbvf_driver_version[] = DRV_VERSION;
  30 static const char igbvf_driver_string[] =
  31                   "Intel(R) Gigabit Virtual Function Network Driver";
  32 static const char igbvf_copyright[] =
  33                   "Copyright (c) 2009 - 2012 Intel Corporation.";
  34 
  35 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
  36 static int debug = -1;
  37 module_param(debug, int, 0);
  38 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  39 
  40 static int igbvf_poll(struct napi_struct *napi, int budget);
  41 static void igbvf_reset(struct igbvf_adapter *);
  42 static void igbvf_set_interrupt_capability(struct igbvf_adapter *);
  43 static void igbvf_reset_interrupt_capability(struct igbvf_adapter *);
  44 
  45 static struct igbvf_info igbvf_vf_info = {
  46         .mac            = e1000_vfadapt,
  47         .flags          = 0,
  48         .pba            = 10,
  49         .init_ops       = e1000_init_function_pointers_vf,
  50 };
  51 
  52 static struct igbvf_info igbvf_i350_vf_info = {
  53         .mac            = e1000_vfadapt_i350,
  54         .flags          = 0,
  55         .pba            = 10,
  56         .init_ops       = e1000_init_function_pointers_vf,
  57 };
  58 
  59 static const struct igbvf_info *igbvf_info_tbl[] = {
  60         [board_vf]      = &igbvf_vf_info,
  61         [board_i350_vf] = &igbvf_i350_vf_info,
  62 };
  63 
  64 /**
  65  * igbvf_desc_unused - calculate if we have unused descriptors
  66  * @rx_ring: address of receive ring structure
  67  **/
  68 static int igbvf_desc_unused(struct igbvf_ring *ring)
  69 {
  70         if (ring->next_to_clean > ring->next_to_use)
  71                 return ring->next_to_clean - ring->next_to_use - 1;
  72 
  73         return ring->count + ring->next_to_clean - ring->next_to_use - 1;
  74 }
  75 
  76 /**
  77  * igbvf_receive_skb - helper function to handle Rx indications
  78  * @adapter: board private structure
  79  * @status: descriptor status field as written by hardware
  80  * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
  81  * @skb: pointer to sk_buff to be indicated to stack
  82  **/
  83 static void igbvf_receive_skb(struct igbvf_adapter *adapter,
  84                               struct net_device *netdev,
  85                               struct sk_buff *skb,
  86                               u32 status, u16 vlan)
  87 {
  88         u16 vid;
  89 
  90         if (status & E1000_RXD_STAT_VP) {
  91                 if ((adapter->flags & IGBVF_FLAG_RX_LB_VLAN_BSWAP) &&
  92                     (status & E1000_RXDEXT_STATERR_LB))
  93                         vid = be16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
  94                 else
  95                         vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
  96                 if (test_bit(vid, adapter->active_vlans))
  97                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
  98         }
  99 
 100         napi_gro_receive(&adapter->rx_ring->napi, skb);
 101 }
 102 
 103 static inline void igbvf_rx_checksum_adv(struct igbvf_adapter *adapter,
 104                                          u32 status_err, struct sk_buff *skb)
 105 {
 106         skb_checksum_none_assert(skb);
 107 
 108         /* Ignore Checksum bit is set or checksum is disabled through ethtool */
 109         if ((status_err & E1000_RXD_STAT_IXSM) ||
 110             (adapter->flags & IGBVF_FLAG_RX_CSUM_DISABLED))
 111                 return;
 112 
 113         /* TCP/UDP checksum error bit is set */
 114         if (status_err &
 115             (E1000_RXDEXT_STATERR_TCPE | E1000_RXDEXT_STATERR_IPE)) {
 116                 /* let the stack verify checksum errors */
 117                 adapter->hw_csum_err++;
 118                 return;
 119         }
 120 
 121         /* It must be a TCP or UDP packet with a valid checksum */
 122         if (status_err & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS))
 123                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 124 
 125         adapter->hw_csum_good++;
 126 }
 127 
 128 /**
 129  * igbvf_alloc_rx_buffers - Replace used receive buffers; packet split
 130  * @rx_ring: address of ring structure to repopulate
 131  * @cleaned_count: number of buffers to repopulate
 132  **/
 133 static void igbvf_alloc_rx_buffers(struct igbvf_ring *rx_ring,
 134                                    int cleaned_count)
 135 {
 136         struct igbvf_adapter *adapter = rx_ring->adapter;
 137         struct net_device *netdev = adapter->netdev;
 138         struct pci_dev *pdev = adapter->pdev;
 139         union e1000_adv_rx_desc *rx_desc;
 140         struct igbvf_buffer *buffer_info;
 141         struct sk_buff *skb;
 142         unsigned int i;
 143         int bufsz;
 144 
 145         i = rx_ring->next_to_use;
 146         buffer_info = &rx_ring->buffer_info[i];
 147 
 148         if (adapter->rx_ps_hdr_size)
 149                 bufsz = adapter->rx_ps_hdr_size;
 150         else
 151                 bufsz = adapter->rx_buffer_len;
 152 
 153         while (cleaned_count--) {
 154                 rx_desc = IGBVF_RX_DESC_ADV(*rx_ring, i);
 155 
 156                 if (adapter->rx_ps_hdr_size && !buffer_info->page_dma) {
 157                         if (!buffer_info->page) {
 158                                 buffer_info->page = alloc_page(GFP_ATOMIC);
 159                                 if (!buffer_info->page) {
 160                                         adapter->alloc_rx_buff_failed++;
 161                                         goto no_buffers;
 162                                 }
 163                                 buffer_info->page_offset = 0;
 164                         } else {
 165                                 buffer_info->page_offset ^= PAGE_SIZE / 2;
 166                         }
 167                         buffer_info->page_dma =
 168                                 dma_map_page(&pdev->dev, buffer_info->page,
 169                                              buffer_info->page_offset,
 170                                              PAGE_SIZE / 2,
 171                                              DMA_FROM_DEVICE);
 172                         if (dma_mapping_error(&pdev->dev,
 173                                               buffer_info->page_dma)) {
 174                                 __free_page(buffer_info->page);
 175                                 buffer_info->page = NULL;
 176                                 dev_err(&pdev->dev, "RX DMA map failed\n");
 177                                 break;
 178                         }
 179                 }
 180 
 181                 if (!buffer_info->skb) {
 182                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
 183                         if (!skb) {
 184                                 adapter->alloc_rx_buff_failed++;
 185                                 goto no_buffers;
 186                         }
 187 
 188                         buffer_info->skb = skb;
 189                         buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
 190                                                           bufsz,
 191                                                           DMA_FROM_DEVICE);
 192                         if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
 193                                 dev_kfree_skb(buffer_info->skb);
 194                                 buffer_info->skb = NULL;
 195                                 dev_err(&pdev->dev, "RX DMA map failed\n");
 196                                 goto no_buffers;
 197                         }
 198                 }
 199                 /* Refresh the desc even if buffer_addrs didn't change because
 200                  * each write-back erases this info.
 201                  */
 202                 if (adapter->rx_ps_hdr_size) {
 203                         rx_desc->read.pkt_addr =
 204                              cpu_to_le64(buffer_info->page_dma);
 205                         rx_desc->read.hdr_addr = cpu_to_le64(buffer_info->dma);
 206                 } else {
 207                         rx_desc->read.pkt_addr = cpu_to_le64(buffer_info->dma);
 208                         rx_desc->read.hdr_addr = 0;
 209                 }
 210 
 211                 i++;
 212                 if (i == rx_ring->count)
 213                         i = 0;
 214                 buffer_info = &rx_ring->buffer_info[i];
 215         }
 216 
 217 no_buffers:
 218         if (rx_ring->next_to_use != i) {
 219                 rx_ring->next_to_use = i;
 220                 if (i == 0)
 221                         i = (rx_ring->count - 1);
 222                 else
 223                         i--;
 224 
 225                 /* Force memory writes to complete before letting h/w
 226                  * know there are new descriptors to fetch.  (Only
 227                  * applicable for weak-ordered memory model archs,
 228                  * such as IA-64).
 229                 */
 230                 wmb();
 231                 writel(i, adapter->hw.hw_addr + rx_ring->tail);
 232         }
 233 }
 234 
 235 /**
 236  * igbvf_clean_rx_irq - Send received data up the network stack; legacy
 237  * @adapter: board private structure
 238  *
 239  * the return value indicates whether actual cleaning was done, there
 240  * is no guarantee that everything was cleaned
 241  **/
 242 static bool igbvf_clean_rx_irq(struct igbvf_adapter *adapter,
 243                                int *work_done, int work_to_do)
 244 {
 245         struct igbvf_ring *rx_ring = adapter->rx_ring;
 246         struct net_device *netdev = adapter->netdev;
 247         struct pci_dev *pdev = adapter->pdev;
 248         union e1000_adv_rx_desc *rx_desc, *next_rxd;
 249         struct igbvf_buffer *buffer_info, *next_buffer;
 250         struct sk_buff *skb;
 251         bool cleaned = false;
 252         int cleaned_count = 0;
 253         unsigned int total_bytes = 0, total_packets = 0;
 254         unsigned int i;
 255         u32 length, hlen, staterr;
 256 
 257         i = rx_ring->next_to_clean;
 258         rx_desc = IGBVF_RX_DESC_ADV(*rx_ring, i);
 259         staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 260 
 261         while (staterr & E1000_RXD_STAT_DD) {
 262                 if (*work_done >= work_to_do)
 263                         break;
 264                 (*work_done)++;
 265                 rmb(); /* read descriptor and rx_buffer_info after status DD */
 266 
 267                 buffer_info = &rx_ring->buffer_info[i];
 268 
 269                 /* HW will not DMA in data larger than the given buffer, even
 270                  * if it parses the (NFS, of course) header to be larger.  In
 271                  * that case, it fills the header buffer and spills the rest
 272                  * into the page.
 273                  */
 274                 hlen = (le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.hdr_info)
 275                        & E1000_RXDADV_HDRBUFLEN_MASK) >>
 276                        E1000_RXDADV_HDRBUFLEN_SHIFT;
 277                 if (hlen > adapter->rx_ps_hdr_size)
 278                         hlen = adapter->rx_ps_hdr_size;
 279 
 280                 length = le16_to_cpu(rx_desc->wb.upper.length);
 281                 cleaned = true;
 282                 cleaned_count++;
 283 
 284                 skb = buffer_info->skb;
 285                 prefetch(skb->data - NET_IP_ALIGN);
 286                 buffer_info->skb = NULL;
 287                 if (!adapter->rx_ps_hdr_size) {
 288                         dma_unmap_single(&pdev->dev, buffer_info->dma,
 289                                          adapter->rx_buffer_len,
 290                                          DMA_FROM_DEVICE);
 291                         buffer_info->dma = 0;
 292                         skb_put(skb, length);
 293                         goto send_up;
 294                 }
 295 
 296                 if (!skb_shinfo(skb)->nr_frags) {
 297                         dma_unmap_single(&pdev->dev, buffer_info->dma,
 298                                          adapter->rx_ps_hdr_size,
 299                                          DMA_FROM_DEVICE);
 300                         buffer_info->dma = 0;
 301                         skb_put(skb, hlen);
 302                 }
 303 
 304                 if (length) {
 305                         dma_unmap_page(&pdev->dev, buffer_info->page_dma,
 306                                        PAGE_SIZE / 2,
 307                                        DMA_FROM_DEVICE);
 308                         buffer_info->page_dma = 0;
 309 
 310                         skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
 311                                            buffer_info->page,
 312                                            buffer_info->page_offset,
 313                                            length);
 314 
 315                         if ((adapter->rx_buffer_len > (PAGE_SIZE / 2)) ||
 316                             (page_count(buffer_info->page) != 1))
 317                                 buffer_info->page = NULL;
 318                         else
 319                                 get_page(buffer_info->page);
 320 
 321                         skb->len += length;
 322                         skb->data_len += length;
 323                         skb->truesize += PAGE_SIZE / 2;
 324                 }
 325 send_up:
 326                 i++;
 327                 if (i == rx_ring->count)
 328                         i = 0;
 329                 next_rxd = IGBVF_RX_DESC_ADV(*rx_ring, i);
 330                 prefetch(next_rxd);
 331                 next_buffer = &rx_ring->buffer_info[i];
 332 
 333                 if (!(staterr & E1000_RXD_STAT_EOP)) {
 334                         buffer_info->skb = next_buffer->skb;
 335                         buffer_info->dma = next_buffer->dma;
 336                         next_buffer->skb = skb;
 337                         next_buffer->dma = 0;
 338                         goto next_desc;
 339                 }
 340 
 341                 if (staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) {
 342                         dev_kfree_skb_irq(skb);
 343                         goto next_desc;
 344                 }
 345 
 346                 total_bytes += skb->len;
 347                 total_packets++;
 348 
 349                 igbvf_rx_checksum_adv(adapter, staterr, skb);
 350 
 351                 skb->protocol = eth_type_trans(skb, netdev);
 352 
 353                 igbvf_receive_skb(adapter, netdev, skb, staterr,
 354                                   rx_desc->wb.upper.vlan);
 355 
 356 next_desc:
 357                 rx_desc->wb.upper.status_error = 0;
 358 
 359                 /* return some buffers to hardware, one at a time is too slow */
 360                 if (cleaned_count >= IGBVF_RX_BUFFER_WRITE) {
 361                         igbvf_alloc_rx_buffers(rx_ring, cleaned_count);
 362                         cleaned_count = 0;
 363                 }
 364 
 365                 /* use prefetched values */
 366                 rx_desc = next_rxd;
 367                 buffer_info = next_buffer;
 368 
 369                 staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 370         }
 371 
 372         rx_ring->next_to_clean = i;
 373         cleaned_count = igbvf_desc_unused(rx_ring);
 374 
 375         if (cleaned_count)
 376                 igbvf_alloc_rx_buffers(rx_ring, cleaned_count);
 377 
 378         adapter->total_rx_packets += total_packets;
 379         adapter->total_rx_bytes += total_bytes;
 380         netdev->stats.rx_bytes += total_bytes;
 381         netdev->stats.rx_packets += total_packets;
 382         return cleaned;
 383 }
 384 
 385 static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
 386                             struct igbvf_buffer *buffer_info)
 387 {
 388         if (buffer_info->dma) {
 389                 if (buffer_info->mapped_as_page)
 390                         dma_unmap_page(&adapter->pdev->dev,
 391                                        buffer_info->dma,
 392                                        buffer_info->length,
 393                                        DMA_TO_DEVICE);
 394                 else
 395                         dma_unmap_single(&adapter->pdev->dev,
 396                                          buffer_info->dma,
 397                                          buffer_info->length,
 398                                          DMA_TO_DEVICE);
 399                 buffer_info->dma = 0;
 400         }
 401         if (buffer_info->skb) {
 402                 dev_kfree_skb_any(buffer_info->skb);
 403                 buffer_info->skb = NULL;
 404         }
 405         buffer_info->time_stamp = 0;
 406 }
 407 
 408 /**
 409  * igbvf_setup_tx_resources - allocate Tx resources (Descriptors)
 410  * @adapter: board private structure
 411  *
 412  * Return 0 on success, negative on failure
 413  **/
 414 int igbvf_setup_tx_resources(struct igbvf_adapter *adapter,
 415                              struct igbvf_ring *tx_ring)
 416 {
 417         struct pci_dev *pdev = adapter->pdev;
 418         int size;
 419 
 420         size = sizeof(struct igbvf_buffer) * tx_ring->count;
 421         tx_ring->buffer_info = vzalloc(size);
 422         if (!tx_ring->buffer_info)
 423                 goto err;
 424 
 425         /* round up to nearest 4K */
 426         tx_ring->size = tx_ring->count * sizeof(union e1000_adv_tx_desc);
 427         tx_ring->size = ALIGN(tx_ring->size, 4096);
 428 
 429         tx_ring->desc = dma_alloc_coherent(&pdev->dev, tx_ring->size,
 430                                            &tx_ring->dma, GFP_KERNEL);
 431         if (!tx_ring->desc)
 432                 goto err;
 433 
 434         tx_ring->adapter = adapter;
 435         tx_ring->next_to_use = 0;
 436         tx_ring->next_to_clean = 0;
 437 
 438         return 0;
 439 err:
 440         vfree(tx_ring->buffer_info);
 441         dev_err(&adapter->pdev->dev,
 442                 "Unable to allocate memory for the transmit descriptor ring\n");
 443         return -ENOMEM;
 444 }
 445 
 446 /**
 447  * igbvf_setup_rx_resources - allocate Rx resources (Descriptors)
 448  * @adapter: board private structure
 449  *
 450  * Returns 0 on success, negative on failure
 451  **/
 452 int igbvf_setup_rx_resources(struct igbvf_adapter *adapter,
 453                              struct igbvf_ring *rx_ring)
 454 {
 455         struct pci_dev *pdev = adapter->pdev;
 456         int size, desc_len;
 457 
 458         size = sizeof(struct igbvf_buffer) * rx_ring->count;
 459         rx_ring->buffer_info = vzalloc(size);
 460         if (!rx_ring->buffer_info)
 461                 goto err;
 462 
 463         desc_len = sizeof(union e1000_adv_rx_desc);
 464 
 465         /* Round up to nearest 4K */
 466         rx_ring->size = rx_ring->count * desc_len;
 467         rx_ring->size = ALIGN(rx_ring->size, 4096);
 468 
 469         rx_ring->desc = dma_alloc_coherent(&pdev->dev, rx_ring->size,
 470                                            &rx_ring->dma, GFP_KERNEL);
 471         if (!rx_ring->desc)
 472                 goto err;
 473 
 474         rx_ring->next_to_clean = 0;
 475         rx_ring->next_to_use = 0;
 476 
 477         rx_ring->adapter = adapter;
 478 
 479         return 0;
 480 
 481 err:
 482         vfree(rx_ring->buffer_info);
 483         rx_ring->buffer_info = NULL;
 484         dev_err(&adapter->pdev->dev,
 485                 "Unable to allocate memory for the receive descriptor ring\n");
 486         return -ENOMEM;
 487 }
 488 
 489 /**
 490  * igbvf_clean_tx_ring - Free Tx Buffers
 491  * @tx_ring: ring to be cleaned
 492  **/
 493 static void igbvf_clean_tx_ring(struct igbvf_ring *tx_ring)
 494 {
 495         struct igbvf_adapter *adapter = tx_ring->adapter;
 496         struct igbvf_buffer *buffer_info;
 497         unsigned long size;
 498         unsigned int i;
 499 
 500         if (!tx_ring->buffer_info)
 501                 return;
 502 
 503         /* Free all the Tx ring sk_buffs */
 504         for (i = 0; i < tx_ring->count; i++) {
 505                 buffer_info = &tx_ring->buffer_info[i];
 506                 igbvf_put_txbuf(adapter, buffer_info);
 507         }
 508 
 509         size = sizeof(struct igbvf_buffer) * tx_ring->count;
 510         memset(tx_ring->buffer_info, 0, size);
 511 
 512         /* Zero out the descriptor ring */
 513         memset(tx_ring->desc, 0, tx_ring->size);
 514 
 515         tx_ring->next_to_use = 0;
 516         tx_ring->next_to_clean = 0;
 517 
 518         writel(0, adapter->hw.hw_addr + tx_ring->head);
 519         writel(0, adapter->hw.hw_addr + tx_ring->tail);
 520 }
 521 
 522 /**
 523  * igbvf_free_tx_resources - Free Tx Resources per Queue
 524  * @tx_ring: ring to free resources from
 525  *
 526  * Free all transmit software resources
 527  **/
 528 void igbvf_free_tx_resources(struct igbvf_ring *tx_ring)
 529 {
 530         struct pci_dev *pdev = tx_ring->adapter->pdev;
 531 
 532         igbvf_clean_tx_ring(tx_ring);
 533 
 534         vfree(tx_ring->buffer_info);
 535         tx_ring->buffer_info = NULL;
 536 
 537         dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
 538                           tx_ring->dma);
 539 
 540         tx_ring->desc = NULL;
 541 }
 542 
 543 /**
 544  * igbvf_clean_rx_ring - Free Rx Buffers per Queue
 545  * @adapter: board private structure
 546  **/
 547 static void igbvf_clean_rx_ring(struct igbvf_ring *rx_ring)
 548 {
 549         struct igbvf_adapter *adapter = rx_ring->adapter;
 550         struct igbvf_buffer *buffer_info;
 551         struct pci_dev *pdev = adapter->pdev;
 552         unsigned long size;
 553         unsigned int i;
 554 
 555         if (!rx_ring->buffer_info)
 556                 return;
 557 
 558         /* Free all the Rx ring sk_buffs */
 559         for (i = 0; i < rx_ring->count; i++) {
 560                 buffer_info = &rx_ring->buffer_info[i];
 561                 if (buffer_info->dma) {
 562                         if (adapter->rx_ps_hdr_size) {
 563                                 dma_unmap_single(&pdev->dev, buffer_info->dma,
 564                                                  adapter->rx_ps_hdr_size,
 565                                                  DMA_FROM_DEVICE);
 566                         } else {
 567                                 dma_unmap_single(&pdev->dev, buffer_info->dma,
 568                                                  adapter->rx_buffer_len,
 569                                                  DMA_FROM_DEVICE);
 570                         }
 571                         buffer_info->dma = 0;
 572                 }
 573 
 574                 if (buffer_info->skb) {
 575                         dev_kfree_skb(buffer_info->skb);
 576                         buffer_info->skb = NULL;
 577                 }
 578 
 579                 if (buffer_info->page) {
 580                         if (buffer_info->page_dma)
 581                                 dma_unmap_page(&pdev->dev,
 582                                                buffer_info->page_dma,
 583                                                PAGE_SIZE / 2,
 584                                                DMA_FROM_DEVICE);
 585                         put_page(buffer_info->page);
 586                         buffer_info->page = NULL;
 587                         buffer_info->page_dma = 0;
 588                         buffer_info->page_offset = 0;
 589                 }
 590         }
 591 
 592         size = sizeof(struct igbvf_buffer) * rx_ring->count;
 593         memset(rx_ring->buffer_info, 0, size);
 594 
 595         /* Zero out the descriptor ring */
 596         memset(rx_ring->desc, 0, rx_ring->size);
 597 
 598         rx_ring->next_to_clean = 0;
 599         rx_ring->next_to_use = 0;
 600 
 601         writel(0, adapter->hw.hw_addr + rx_ring->head);
 602         writel(0, adapter->hw.hw_addr + rx_ring->tail);
 603 }
 604 
 605 /**
 606  * igbvf_free_rx_resources - Free Rx Resources
 607  * @rx_ring: ring to clean the resources from
 608  *
 609  * Free all receive software resources
 610  **/
 611 
 612 void igbvf_free_rx_resources(struct igbvf_ring *rx_ring)
 613 {
 614         struct pci_dev *pdev = rx_ring->adapter->pdev;
 615 
 616         igbvf_clean_rx_ring(rx_ring);
 617 
 618         vfree(rx_ring->buffer_info);
 619         rx_ring->buffer_info = NULL;
 620 
 621         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 622                           rx_ring->dma);
 623         rx_ring->desc = NULL;
 624 }
 625 
 626 /**
 627  * igbvf_update_itr - update the dynamic ITR value based on statistics
 628  * @adapter: pointer to adapter
 629  * @itr_setting: current adapter->itr
 630  * @packets: the number of packets during this measurement interval
 631  * @bytes: the number of bytes during this measurement interval
 632  *
 633  * Stores a new ITR value based on packets and byte counts during the last
 634  * interrupt.  The advantage of per interrupt computation is faster updates
 635  * and more accurate ITR for the current traffic pattern.  Constants in this
 636  * function were computed based on theoretical maximum wire speed and thresholds
 637  * were set based on testing data as well as attempting to minimize response
 638  * time while increasing bulk throughput.
 639  **/
 640 static enum latency_range igbvf_update_itr(struct igbvf_adapter *adapter,
 641                                            enum latency_range itr_setting,
 642                                            int packets, int bytes)
 643 {
 644         enum latency_range retval = itr_setting;
 645 
 646         if (packets == 0)
 647                 goto update_itr_done;
 648 
 649         switch (itr_setting) {
 650         case lowest_latency:
 651                 /* handle TSO and jumbo frames */
 652                 if (bytes/packets > 8000)
 653                         retval = bulk_latency;
 654                 else if ((packets < 5) && (bytes > 512))
 655                         retval = low_latency;
 656                 break;
 657         case low_latency:  /* 50 usec aka 20000 ints/s */
 658                 if (bytes > 10000) {
 659                         /* this if handles the TSO accounting */
 660                         if (bytes/packets > 8000)
 661                                 retval = bulk_latency;
 662                         else if ((packets < 10) || ((bytes/packets) > 1200))
 663                                 retval = bulk_latency;
 664                         else if ((packets > 35))
 665                                 retval = lowest_latency;
 666                 } else if (bytes/packets > 2000) {
 667                         retval = bulk_latency;
 668                 } else if (packets <= 2 && bytes < 512) {
 669                         retval = lowest_latency;
 670                 }
 671                 break;
 672         case bulk_latency: /* 250 usec aka 4000 ints/s */
 673                 if (bytes > 25000) {
 674                         if (packets > 35)
 675                                 retval = low_latency;
 676                 } else if (bytes < 6000) {
 677                         retval = low_latency;
 678                 }
 679                 break;
 680         default:
 681                 break;
 682         }
 683 
 684 update_itr_done:
 685         return retval;
 686 }
 687 
 688 static int igbvf_range_to_itr(enum latency_range current_range)
 689 {
 690         int new_itr;
 691 
 692         switch (current_range) {
 693         /* counts and packets in update_itr are dependent on these numbers */
 694         case lowest_latency:
 695                 new_itr = IGBVF_70K_ITR;
 696                 break;
 697         case low_latency:
 698                 new_itr = IGBVF_20K_ITR;
 699                 break;
 700         case bulk_latency:
 701                 new_itr = IGBVF_4K_ITR;
 702                 break;
 703         default:
 704                 new_itr = IGBVF_START_ITR;
 705                 break;
 706         }
 707         return new_itr;
 708 }
 709 
 710 static void igbvf_set_itr(struct igbvf_adapter *adapter)
 711 {
 712         u32 new_itr;
 713 
 714         adapter->tx_ring->itr_range =
 715                         igbvf_update_itr(adapter,
 716                                          adapter->tx_ring->itr_val,
 717                                          adapter->total_tx_packets,
 718                                          adapter->total_tx_bytes);
 719 
 720         /* conservative mode (itr 3) eliminates the lowest_latency setting */
 721         if (adapter->requested_itr == 3 &&
 722             adapter->tx_ring->itr_range == lowest_latency)
 723                 adapter->tx_ring->itr_range = low_latency;
 724 
 725         new_itr = igbvf_range_to_itr(adapter->tx_ring->itr_range);
 726 
 727         if (new_itr != adapter->tx_ring->itr_val) {
 728                 u32 current_itr = adapter->tx_ring->itr_val;
 729                 /* this attempts to bias the interrupt rate towards Bulk
 730                  * by adding intermediate steps when interrupt rate is
 731                  * increasing
 732                  */
 733                 new_itr = new_itr > current_itr ?
 734                           min(current_itr + (new_itr >> 2), new_itr) :
 735                           new_itr;
 736                 adapter->tx_ring->itr_val = new_itr;
 737 
 738                 adapter->tx_ring->set_itr = 1;
 739         }
 740 
 741         adapter->rx_ring->itr_range =
 742                         igbvf_update_itr(adapter, adapter->rx_ring->itr_val,
 743                                          adapter->total_rx_packets,
 744                                          adapter->total_rx_bytes);
 745         if (adapter->requested_itr == 3 &&
 746             adapter->rx_ring->itr_range == lowest_latency)
 747                 adapter->rx_ring->itr_range = low_latency;
 748 
 749         new_itr = igbvf_range_to_itr(adapter->rx_ring->itr_range);
 750 
 751         if (new_itr != adapter->rx_ring->itr_val) {
 752                 u32 current_itr = adapter->rx_ring->itr_val;
 753 
 754                 new_itr = new_itr > current_itr ?
 755                           min(current_itr + (new_itr >> 2), new_itr) :
 756                           new_itr;
 757                 adapter->rx_ring->itr_val = new_itr;
 758 
 759                 adapter->rx_ring->set_itr = 1;
 760         }
 761 }
 762 
 763 /**
 764  * igbvf_clean_tx_irq - Reclaim resources after transmit completes
 765  * @adapter: board private structure
 766  *
 767  * returns true if ring is completely cleaned
 768  **/
 769 static bool igbvf_clean_tx_irq(struct igbvf_ring *tx_ring)
 770 {
 771         struct igbvf_adapter *adapter = tx_ring->adapter;
 772         struct net_device *netdev = adapter->netdev;
 773         struct igbvf_buffer *buffer_info;
 774         struct sk_buff *skb;
 775         union e1000_adv_tx_desc *tx_desc, *eop_desc;
 776         unsigned int total_bytes = 0, total_packets = 0;
 777         unsigned int i, count = 0;
 778         bool cleaned = false;
 779 
 780         i = tx_ring->next_to_clean;
 781         buffer_info = &tx_ring->buffer_info[i];
 782         eop_desc = buffer_info->next_to_watch;
 783 
 784         do {
 785                 /* if next_to_watch is not set then there is no work pending */
 786                 if (!eop_desc)
 787                         break;
 788 
 789                 /* prevent any other reads prior to eop_desc */
 790                 smp_rmb();
 791 
 792                 /* if DD is not set pending work has not been completed */
 793                 if (!(eop_desc->wb.status & cpu_to_le32(E1000_TXD_STAT_DD)))
 794                         break;
 795 
 796                 /* clear next_to_watch to prevent false hangs */
 797                 buffer_info->next_to_watch = NULL;
 798 
 799                 for (cleaned = false; !cleaned; count++) {
 800                         tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
 801                         cleaned = (tx_desc == eop_desc);
 802                         skb = buffer_info->skb;
 803 
 804                         if (skb) {
 805                                 unsigned int segs, bytecount;
 806 
 807                                 /* gso_segs is currently only valid for tcp */
 808                                 segs = skb_shinfo(skb)->gso_segs ?: 1;
 809                                 /* multiply data chunks by size of headers */
 810                                 bytecount = ((segs - 1) * skb_headlen(skb)) +
 811                                             skb->len;
 812                                 total_packets += segs;
 813                                 total_bytes += bytecount;
 814                         }
 815 
 816                         igbvf_put_txbuf(adapter, buffer_info);
 817                         tx_desc->wb.status = 0;
 818 
 819                         i++;
 820                         if (i == tx_ring->count)
 821                                 i = 0;
 822 
 823                         buffer_info = &tx_ring->buffer_info[i];
 824                 }
 825 
 826                 eop_desc = buffer_info->next_to_watch;
 827         } while (count < tx_ring->count);
 828 
 829         tx_ring->next_to_clean = i;
 830 
 831         if (unlikely(count && netif_carrier_ok(netdev) &&
 832             igbvf_desc_unused(tx_ring) >= IGBVF_TX_QUEUE_WAKE)) {
 833                 /* Make sure that anybody stopping the queue after this
 834                  * sees the new next_to_clean.
 835                  */
 836                 smp_mb();
 837                 if (netif_queue_stopped(netdev) &&
 838                     !(test_bit(__IGBVF_DOWN, &adapter->state))) {
 839                         netif_wake_queue(netdev);
 840                         ++adapter->restart_queue;
 841                 }
 842         }
 843 
 844         netdev->stats.tx_bytes += total_bytes;
 845         netdev->stats.tx_packets += total_packets;
 846         return count < tx_ring->count;
 847 }
 848 
 849 static irqreturn_t igbvf_msix_other(int irq, void *data)
 850 {
 851         struct net_device *netdev = data;
 852         struct igbvf_adapter *adapter = netdev_priv(netdev);
 853         struct e1000_hw *hw = &adapter->hw;
 854 
 855         adapter->int_counter1++;
 856 
 857         hw->mac.get_link_status = 1;
 858         if (!test_bit(__IGBVF_DOWN, &adapter->state))
 859                 mod_timer(&adapter->watchdog_timer, jiffies + 1);
 860 
 861         ew32(EIMS, adapter->eims_other);
 862 
 863         return IRQ_HANDLED;
 864 }
 865 
 866 static irqreturn_t igbvf_intr_msix_tx(int irq, void *data)
 867 {
 868         struct net_device *netdev = data;
 869         struct igbvf_adapter *adapter = netdev_priv(netdev);
 870         struct e1000_hw *hw = &adapter->hw;
 871         struct igbvf_ring *tx_ring = adapter->tx_ring;
 872 
 873         if (tx_ring->set_itr) {
 874                 writel(tx_ring->itr_val,
 875                        adapter->hw.hw_addr + tx_ring->itr_register);
 876                 adapter->tx_ring->set_itr = 0;
 877         }
 878 
 879         adapter->total_tx_bytes = 0;
 880         adapter->total_tx_packets = 0;
 881 
 882         /* auto mask will automatically re-enable the interrupt when we write
 883          * EICS
 884          */
 885         if (!igbvf_clean_tx_irq(tx_ring))
 886                 /* Ring was not completely cleaned, so fire another interrupt */
 887                 ew32(EICS, tx_ring->eims_value);
 888         else
 889                 ew32(EIMS, tx_ring->eims_value);
 890 
 891         return IRQ_HANDLED;
 892 }
 893 
 894 static irqreturn_t igbvf_intr_msix_rx(int irq, void *data)
 895 {
 896         struct net_device *netdev = data;
 897         struct igbvf_adapter *adapter = netdev_priv(netdev);
 898 
 899         adapter->int_counter0++;
 900 
 901         /* Write the ITR value calculated at the end of the
 902          * previous interrupt.
 903          */
 904         if (adapter->rx_ring->set_itr) {
 905                 writel(adapter->rx_ring->itr_val,
 906                        adapter->hw.hw_addr + adapter->rx_ring->itr_register);
 907                 adapter->rx_ring->set_itr = 0;
 908         }
 909 
 910         if (napi_schedule_prep(&adapter->rx_ring->napi)) {
 911                 adapter->total_rx_bytes = 0;
 912                 adapter->total_rx_packets = 0;
 913                 __napi_schedule(&adapter->rx_ring->napi);
 914         }
 915 
 916         return IRQ_HANDLED;
 917 }
 918 
 919 #define IGBVF_NO_QUEUE -1
 920 
 921 static void igbvf_assign_vector(struct igbvf_adapter *adapter, int rx_queue,
 922                                 int tx_queue, int msix_vector)
 923 {
 924         struct e1000_hw *hw = &adapter->hw;
 925         u32 ivar, index;
 926 
 927         /* 82576 uses a table-based method for assigning vectors.
 928          * Each queue has a single entry in the table to which we write
 929          * a vector number along with a "valid" bit.  Sadly, the layout
 930          * of the table is somewhat counterintuitive.
 931          */
 932         if (rx_queue > IGBVF_NO_QUEUE) {
 933                 index = (rx_queue >> 1);
 934                 ivar = array_er32(IVAR0, index);
 935                 if (rx_queue & 0x1) {
 936                         /* vector goes into third byte of register */
 937                         ivar = ivar & 0xFF00FFFF;
 938                         ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
 939                 } else {
 940                         /* vector goes into low byte of register */
 941                         ivar = ivar & 0xFFFFFF00;
 942                         ivar |= msix_vector | E1000_IVAR_VALID;
 943                 }
 944                 adapter->rx_ring[rx_queue].eims_value = BIT(msix_vector);
 945                 array_ew32(IVAR0, index, ivar);
 946         }
 947         if (tx_queue > IGBVF_NO_QUEUE) {
 948                 index = (tx_queue >> 1);
 949                 ivar = array_er32(IVAR0, index);
 950                 if (tx_queue & 0x1) {
 951                         /* vector goes into high byte of register */
 952                         ivar = ivar & 0x00FFFFFF;
 953                         ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
 954                 } else {
 955                         /* vector goes into second byte of register */
 956                         ivar = ivar & 0xFFFF00FF;
 957                         ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
 958                 }
 959                 adapter->tx_ring[tx_queue].eims_value = BIT(msix_vector);
 960                 array_ew32(IVAR0, index, ivar);
 961         }
 962 }
 963 
 964 /**
 965  * igbvf_configure_msix - Configure MSI-X hardware
 966  * @adapter: board private structure
 967  *
 968  * igbvf_configure_msix sets up the hardware to properly
 969  * generate MSI-X interrupts.
 970  **/
 971 static void igbvf_configure_msix(struct igbvf_adapter *adapter)
 972 {
 973         u32 tmp;
 974         struct e1000_hw *hw = &adapter->hw;
 975         struct igbvf_ring *tx_ring = adapter->tx_ring;
 976         struct igbvf_ring *rx_ring = adapter->rx_ring;
 977         int vector = 0;
 978 
 979         adapter->eims_enable_mask = 0;
 980 
 981         igbvf_assign_vector(adapter, IGBVF_NO_QUEUE, 0, vector++);
 982         adapter->eims_enable_mask |= tx_ring->eims_value;
 983         writel(tx_ring->itr_val, hw->hw_addr + tx_ring->itr_register);
 984         igbvf_assign_vector(adapter, 0, IGBVF_NO_QUEUE, vector++);
 985         adapter->eims_enable_mask |= rx_ring->eims_value;
 986         writel(rx_ring->itr_val, hw->hw_addr + rx_ring->itr_register);
 987 
 988         /* set vector for other causes, i.e. link changes */
 989 
 990         tmp = (vector++ | E1000_IVAR_VALID);
 991 
 992         ew32(IVAR_MISC, tmp);
 993 
 994         adapter->eims_enable_mask = GENMASK(vector - 1, 0);
 995         adapter->eims_other = BIT(vector - 1);
 996         e1e_flush();
 997 }
 998 
 999 static void igbvf_reset_interrupt_capability(struct igbvf_adapter *adapter)
1000 {
1001         if (adapter->msix_entries) {
1002                 pci_disable_msix(adapter->pdev);
1003                 kfree(adapter->msix_entries);
1004                 adapter->msix_entries = NULL;
1005         }
1006 }
1007 
1008 /**
1009  * igbvf_set_interrupt_capability - set MSI or MSI-X if supported
1010  * @adapter: board private structure
1011  *
1012  * Attempt to configure interrupts using the best available
1013  * capabilities of the hardware and kernel.
1014  **/
1015 static void igbvf_set_interrupt_capability(struct igbvf_adapter *adapter)
1016 {
1017         int err = -ENOMEM;
1018         int i;
1019 
1020         /* we allocate 3 vectors, 1 for Tx, 1 for Rx, one for PF messages */
1021         adapter->msix_entries = kcalloc(3, sizeof(struct msix_entry),
1022                                         GFP_KERNEL);
1023         if (adapter->msix_entries) {
1024                 for (i = 0; i < 3; i++)
1025                         adapter->msix_entries[i].entry = i;
1026 
1027                 err = pci_enable_msix_range(adapter->pdev,
1028                                             adapter->msix_entries, 3, 3);
1029         }
1030 
1031         if (err < 0) {
1032                 /* MSI-X failed */
1033                 dev_err(&adapter->pdev->dev,
1034                         "Failed to initialize MSI-X interrupts.\n");
1035                 igbvf_reset_interrupt_capability(adapter);
1036         }
1037 }
1038 
1039 /**
1040  * igbvf_request_msix - Initialize MSI-X interrupts
1041  * @adapter: board private structure
1042  *
1043  * igbvf_request_msix allocates MSI-X vectors and requests interrupts from the
1044  * kernel.
1045  **/
1046 static int igbvf_request_msix(struct igbvf_adapter *adapter)
1047 {
1048         struct net_device *netdev = adapter->netdev;
1049         int err = 0, vector = 0;
1050 
1051         if (strlen(netdev->name) < (IFNAMSIZ - 5)) {
1052                 sprintf(adapter->tx_ring->name, "%s-tx-0", netdev->name);
1053                 sprintf(adapter->rx_ring->name, "%s-rx-0", netdev->name);
1054         } else {
1055                 memcpy(adapter->tx_ring->name, netdev->name, IFNAMSIZ);
1056                 memcpy(adapter->rx_ring->name, netdev->name, IFNAMSIZ);
1057         }
1058 
1059         err = request_irq(adapter->msix_entries[vector].vector,
1060                           igbvf_intr_msix_tx, 0, adapter->tx_ring->name,
1061                           netdev);
1062         if (err)
1063                 goto out;
1064 
1065         adapter->tx_ring->itr_register = E1000_EITR(vector);
1066         adapter->tx_ring->itr_val = adapter->current_itr;
1067         vector++;
1068 
1069         err = request_irq(adapter->msix_entries[vector].vector,
1070                           igbvf_intr_msix_rx, 0, adapter->rx_ring->name,
1071                           netdev);
1072         if (err)
1073                 goto out;
1074 
1075         adapter->rx_ring->itr_register = E1000_EITR(vector);
1076         adapter->rx_ring->itr_val = adapter->current_itr;
1077         vector++;
1078 
1079         err = request_irq(adapter->msix_entries[vector].vector,
1080                           igbvf_msix_other, 0, netdev->name, netdev);
1081         if (err)
1082                 goto out;
1083 
1084         igbvf_configure_msix(adapter);
1085         return 0;
1086 out:
1087         return err;
1088 }
1089 
1090 /**
1091  * igbvf_alloc_queues - Allocate memory for all rings
1092  * @adapter: board private structure to initialize
1093  **/
1094 static int igbvf_alloc_queues(struct igbvf_adapter *adapter)
1095 {
1096         struct net_device *netdev = adapter->netdev;
1097 
1098         adapter->tx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
1099         if (!adapter->tx_ring)
1100                 return -ENOMEM;
1101 
1102         adapter->rx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
1103         if (!adapter->rx_ring) {
1104                 kfree(adapter->tx_ring);
1105                 return -ENOMEM;
1106         }
1107 
1108         netif_napi_add(netdev, &adapter->rx_ring->napi, igbvf_poll, 64);
1109 
1110         return 0;
1111 }
1112 
1113 /**
1114  * igbvf_request_irq - initialize interrupts
1115  * @adapter: board private structure
1116  *
1117  * Attempts to configure interrupts using the best available
1118  * capabilities of the hardware and kernel.
1119  **/
1120 static int igbvf_request_irq(struct igbvf_adapter *adapter)
1121 {
1122         int err = -1;
1123 
1124         /* igbvf supports msi-x only */
1125         if (adapter->msix_entries)
1126                 err = igbvf_request_msix(adapter);
1127 
1128         if (!err)
1129                 return err;
1130 
1131         dev_err(&adapter->pdev->dev,
1132                 "Unable to allocate interrupt, Error: %d\n", err);
1133 
1134         return err;
1135 }
1136 
1137 static void igbvf_free_irq(struct igbvf_adapter *adapter)
1138 {
1139         struct net_device *netdev = adapter->netdev;
1140         int vector;
1141 
1142         if (adapter->msix_entries) {
1143                 for (vector = 0; vector < 3; vector++)
1144                         free_irq(adapter->msix_entries[vector].vector, netdev);
1145         }
1146 }
1147 
1148 /**
1149  * igbvf_irq_disable - Mask off interrupt generation on the NIC
1150  * @adapter: board private structure
1151  **/
1152 static void igbvf_irq_disable(struct igbvf_adapter *adapter)
1153 {
1154         struct e1000_hw *hw = &adapter->hw;
1155 
1156         ew32(EIMC, ~0);
1157 
1158         if (adapter->msix_entries)
1159                 ew32(EIAC, 0);
1160 }
1161 
1162 /**
1163  * igbvf_irq_enable - Enable default interrupt generation settings
1164  * @adapter: board private structure
1165  **/
1166 static void igbvf_irq_enable(struct igbvf_adapter *adapter)
1167 {
1168         struct e1000_hw *hw = &adapter->hw;
1169 
1170         ew32(EIAC, adapter->eims_enable_mask);
1171         ew32(EIAM, adapter->eims_enable_mask);
1172         ew32(EIMS, adapter->eims_enable_mask);
1173 }
1174 
1175 /**
1176  * igbvf_poll - NAPI Rx polling callback
1177  * @napi: struct associated with this polling callback
1178  * @budget: amount of packets driver is allowed to process this poll
1179  **/
1180 static int igbvf_poll(struct napi_struct *napi, int budget)
1181 {
1182         struct igbvf_ring *rx_ring = container_of(napi, struct igbvf_ring, napi);
1183         struct igbvf_adapter *adapter = rx_ring->adapter;
1184         struct e1000_hw *hw = &adapter->hw;
1185         int work_done = 0;
1186 
1187         igbvf_clean_rx_irq(adapter, &work_done, budget);
1188 
1189         if (work_done == budget)
1190                 return budget;
1191 
1192         /* Exit the polling mode, but don't re-enable interrupts if stack might
1193          * poll us due to busy-polling
1194          */
1195         if (likely(napi_complete_done(napi, work_done))) {
1196                 if (adapter->requested_itr & 3)
1197                         igbvf_set_itr(adapter);
1198 
1199                 if (!test_bit(__IGBVF_DOWN, &adapter->state))
1200                         ew32(EIMS, adapter->rx_ring->eims_value);
1201         }
1202 
1203         return work_done;
1204 }
1205 
1206 /**
1207  * igbvf_set_rlpml - set receive large packet maximum length
1208  * @adapter: board private structure
1209  *
1210  * Configure the maximum size of packets that will be received
1211  */
1212 static void igbvf_set_rlpml(struct igbvf_adapter *adapter)
1213 {
1214         int max_frame_size;
1215         struct e1000_hw *hw = &adapter->hw;
1216 
1217         max_frame_size = adapter->max_frame_size + VLAN_TAG_SIZE;
1218 
1219         spin_lock_bh(&hw->mbx_lock);
1220 
1221         e1000_rlpml_set_vf(hw, max_frame_size);
1222 
1223         spin_unlock_bh(&hw->mbx_lock);
1224 }
1225 
1226 static int igbvf_vlan_rx_add_vid(struct net_device *netdev,
1227                                  __be16 proto, u16 vid)
1228 {
1229         struct igbvf_adapter *adapter = netdev_priv(netdev);
1230         struct e1000_hw *hw = &adapter->hw;
1231 
1232         spin_lock_bh(&hw->mbx_lock);
1233 
1234         if (hw->mac.ops.set_vfta(hw, vid, true)) {
1235                 dev_err(&adapter->pdev->dev, "Failed to add vlan id %d\n", vid);
1236                 spin_unlock_bh(&hw->mbx_lock);
1237                 return -EINVAL;
1238         }
1239 
1240         spin_unlock_bh(&hw->mbx_lock);
1241 
1242         set_bit(vid, adapter->active_vlans);
1243         return 0;
1244 }
1245 
1246 static int igbvf_vlan_rx_kill_vid(struct net_device *netdev,
1247                                   __be16 proto, u16 vid)
1248 {
1249         struct igbvf_adapter *adapter = netdev_priv(netdev);
1250         struct e1000_hw *hw = &adapter->hw;
1251 
1252         spin_lock_bh(&hw->mbx_lock);
1253 
1254         if (hw->mac.ops.set_vfta(hw, vid, false)) {
1255                 dev_err(&adapter->pdev->dev,
1256                         "Failed to remove vlan id %d\n", vid);
1257                 spin_unlock_bh(&hw->mbx_lock);
1258                 return -EINVAL;
1259         }
1260 
1261         spin_unlock_bh(&hw->mbx_lock);
1262 
1263         clear_bit(vid, adapter->active_vlans);
1264         return 0;
1265 }
1266 
1267 static void igbvf_restore_vlan(struct igbvf_adapter *adapter)
1268 {
1269         u16 vid;
1270 
1271         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
1272                 igbvf_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
1273 }
1274 
1275 /**
1276  * igbvf_configure_tx - Configure Transmit Unit after Reset
1277  * @adapter: board private structure
1278  *
1279  * Configure the Tx unit of the MAC after a reset.
1280  **/
1281 static void igbvf_configure_tx(struct igbvf_adapter *adapter)
1282 {
1283         struct e1000_hw *hw = &adapter->hw;
1284         struct igbvf_ring *tx_ring = adapter->tx_ring;
1285         u64 tdba;
1286         u32 txdctl, dca_txctrl;
1287 
1288         /* disable transmits */
1289         txdctl = er32(TXDCTL(0));
1290         ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
1291         e1e_flush();
1292         msleep(10);
1293 
1294         /* Setup the HW Tx Head and Tail descriptor pointers */
1295         ew32(TDLEN(0), tx_ring->count * sizeof(union e1000_adv_tx_desc));
1296         tdba = tx_ring->dma;
1297         ew32(TDBAL(0), (tdba & DMA_BIT_MASK(32)));
1298         ew32(TDBAH(0), (tdba >> 32));
1299         ew32(TDH(0), 0);
1300         ew32(TDT(0), 0);
1301         tx_ring->head = E1000_TDH(0);
1302         tx_ring->tail = E1000_TDT(0);
1303 
1304         /* Turn off Relaxed Ordering on head write-backs.  The writebacks
1305          * MUST be delivered in order or it will completely screw up
1306          * our bookkeeping.
1307          */
1308         dca_txctrl = er32(DCA_TXCTRL(0));
1309         dca_txctrl &= ~E1000_DCA_TXCTRL_TX_WB_RO_EN;
1310         ew32(DCA_TXCTRL(0), dca_txctrl);
1311 
1312         /* enable transmits */
1313         txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
1314         ew32(TXDCTL(0), txdctl);
1315 
1316         /* Setup Transmit Descriptor Settings for eop descriptor */
1317         adapter->txd_cmd = E1000_ADVTXD_DCMD_EOP | E1000_ADVTXD_DCMD_IFCS;
1318 
1319         /* enable Report Status bit */
1320         adapter->txd_cmd |= E1000_ADVTXD_DCMD_RS;
1321 }
1322 
1323 /**
1324  * igbvf_setup_srrctl - configure the receive control registers
1325  * @adapter: Board private structure
1326  **/
1327 static void igbvf_setup_srrctl(struct igbvf_adapter *adapter)
1328 {
1329         struct e1000_hw *hw = &adapter->hw;
1330         u32 srrctl = 0;
1331 
1332         srrctl &= ~(E1000_SRRCTL_DESCTYPE_MASK |
1333                     E1000_SRRCTL_BSIZEHDR_MASK |
1334                     E1000_SRRCTL_BSIZEPKT_MASK);
1335 
1336         /* Enable queue drop to avoid head of line blocking */
1337         srrctl |= E1000_SRRCTL_DROP_EN;
1338 
1339         /* Setup buffer sizes */
1340         srrctl |= ALIGN(adapter->rx_buffer_len, 1024) >>
1341                   E1000_SRRCTL_BSIZEPKT_SHIFT;
1342 
1343         if (adapter->rx_buffer_len < 2048) {
1344                 adapter->rx_ps_hdr_size = 0;
1345                 srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
1346         } else {
1347                 adapter->rx_ps_hdr_size = 128;
1348                 srrctl |= adapter->rx_ps_hdr_size <<
1349                           E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
1350                 srrctl |= E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
1351         }
1352 
1353         ew32(SRRCTL(0), srrctl);
1354 }
1355 
1356 /**
1357  * igbvf_configure_rx - Configure Receive Unit after Reset
1358  * @adapter: board private structure
1359  *
1360  * Configure the Rx unit of the MAC after a reset.
1361  **/
1362 static void igbvf_configure_rx(struct igbvf_adapter *adapter)
1363 {
1364         struct e1000_hw *hw = &adapter->hw;
1365         struct igbvf_ring *rx_ring = adapter->rx_ring;
1366         u64 rdba;
1367         u32 rxdctl;
1368 
1369         /* disable receives */
1370         rxdctl = er32(RXDCTL(0));
1371         ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
1372         e1e_flush();
1373         msleep(10);
1374 
1375         /* Setup the HW Rx Head and Tail Descriptor Pointers and
1376          * the Base and Length of the Rx Descriptor Ring
1377          */
1378         rdba = rx_ring->dma;
1379         ew32(RDBAL(0), (rdba & DMA_BIT_MASK(32)));
1380         ew32(RDBAH(0), (rdba >> 32));
1381         ew32(RDLEN(0), rx_ring->count * sizeof(union e1000_adv_rx_desc));
1382         rx_ring->head = E1000_RDH(0);
1383         rx_ring->tail = E1000_RDT(0);
1384         ew32(RDH(0), 0);
1385         ew32(RDT(0), 0);
1386 
1387         rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
1388         rxdctl &= 0xFFF00000;
1389         rxdctl |= IGBVF_RX_PTHRESH;
1390         rxdctl |= IGBVF_RX_HTHRESH << 8;
1391         rxdctl |= IGBVF_RX_WTHRESH << 16;
1392 
1393         igbvf_set_rlpml(adapter);
1394 
1395         /* enable receives */
1396         ew32(RXDCTL(0), rxdctl);
1397 }
1398 
1399 /**
1400  * igbvf_set_multi - Multicast and Promiscuous mode set
1401  * @netdev: network interface device structure
1402  *
1403  * The set_multi entry point is called whenever the multicast address
1404  * list or the network interface flags are updated.  This routine is
1405  * responsible for configuring the hardware for proper multicast,
1406  * promiscuous mode, and all-multi behavior.
1407  **/
1408 static void igbvf_set_multi(struct net_device *netdev)
1409 {
1410         struct igbvf_adapter *adapter = netdev_priv(netdev);
1411         struct e1000_hw *hw = &adapter->hw;
1412         struct netdev_hw_addr *ha;
1413         u8  *mta_list = NULL;
1414         int i;
1415 
1416         if (!netdev_mc_empty(netdev)) {
1417                 mta_list = kmalloc_array(netdev_mc_count(netdev), ETH_ALEN,
1418                                          GFP_ATOMIC);
1419                 if (!mta_list)
1420                         return;
1421         }
1422 
1423         /* prepare a packed array of only addresses. */
1424         i = 0;
1425         netdev_for_each_mc_addr(ha, netdev)
1426                 memcpy(mta_list + (i++ * ETH_ALEN), ha->addr, ETH_ALEN);
1427 
1428         spin_lock_bh(&hw->mbx_lock);
1429 
1430         hw->mac.ops.update_mc_addr_list(hw, mta_list, i, 0, 0);
1431 
1432         spin_unlock_bh(&hw->mbx_lock);
1433         kfree(mta_list);
1434 }
1435 
1436 /**
1437  * igbvf_set_uni - Configure unicast MAC filters
1438  * @netdev: network interface device structure
1439  *
1440  * This routine is responsible for configuring the hardware for proper
1441  * unicast filters.
1442  **/
1443 static int igbvf_set_uni(struct net_device *netdev)
1444 {
1445         struct igbvf_adapter *adapter = netdev_priv(netdev);
1446         struct e1000_hw *hw = &adapter->hw;
1447 
1448         if (netdev_uc_count(netdev) > IGBVF_MAX_MAC_FILTERS) {
1449                 pr_err("Too many unicast filters - No Space\n");
1450                 return -ENOSPC;
1451         }
1452 
1453         spin_lock_bh(&hw->mbx_lock);
1454 
1455         /* Clear all unicast MAC filters */
1456         hw->mac.ops.set_uc_addr(hw, E1000_VF_MAC_FILTER_CLR, NULL);
1457 
1458         spin_unlock_bh(&hw->mbx_lock);
1459 
1460         if (!netdev_uc_empty(netdev)) {
1461                 struct netdev_hw_addr *ha;
1462 
1463                 /* Add MAC filters one by one */
1464                 netdev_for_each_uc_addr(ha, netdev) {
1465                         spin_lock_bh(&hw->mbx_lock);
1466 
1467                         hw->mac.ops.set_uc_addr(hw, E1000_VF_MAC_FILTER_ADD,
1468                                                 ha->addr);
1469 
1470                         spin_unlock_bh(&hw->mbx_lock);
1471                         udelay(200);
1472                 }
1473         }
1474 
1475         return 0;
1476 }
1477 
1478 static void igbvf_set_rx_mode(struct net_device *netdev)
1479 {
1480         igbvf_set_multi(netdev);
1481         igbvf_set_uni(netdev);
1482 }
1483 
1484 /**
1485  * igbvf_configure - configure the hardware for Rx and Tx
1486  * @adapter: private board structure
1487  **/
1488 static void igbvf_configure(struct igbvf_adapter *adapter)
1489 {
1490         igbvf_set_rx_mode(adapter->netdev);
1491 
1492         igbvf_restore_vlan(adapter);
1493 
1494         igbvf_configure_tx(adapter);
1495         igbvf_setup_srrctl(adapter);
1496         igbvf_configure_rx(adapter);
1497         igbvf_alloc_rx_buffers(adapter->rx_ring,
1498                                igbvf_desc_unused(adapter->rx_ring));
1499 }
1500 
1501 /* igbvf_reset - bring the hardware into a known good state
1502  * @adapter: private board structure
1503  *
1504  * This function boots the hardware and enables some settings that
1505  * require a configuration cycle of the hardware - those cannot be
1506  * set/changed during runtime. After reset the device needs to be
1507  * properly configured for Rx, Tx etc.
1508  */
1509 static void igbvf_reset(struct igbvf_adapter *adapter)
1510 {
1511         struct e1000_mac_info *mac = &adapter->hw.mac;
1512         struct net_device *netdev = adapter->netdev;
1513         struct e1000_hw *hw = &adapter->hw;
1514 
1515         spin_lock_bh(&hw->mbx_lock);
1516 
1517         /* Allow time for pending master requests to run */
1518         if (mac->ops.reset_hw(hw))
1519                 dev_err(&adapter->pdev->dev, "PF still resetting\n");
1520 
1521         mac->ops.init_hw(hw);
1522 
1523         spin_unlock_bh(&hw->mbx_lock);
1524 
1525         if (is_valid_ether_addr(adapter->hw.mac.addr)) {
1526                 memcpy(netdev->dev_addr, adapter->hw.mac.addr,
1527                        netdev->addr_len);
1528                 memcpy(netdev->perm_addr, adapter->hw.mac.addr,
1529                        netdev->addr_len);
1530         }
1531 
1532         adapter->last_reset = jiffies;
1533 }
1534 
1535 int igbvf_up(struct igbvf_adapter *adapter)
1536 {
1537         struct e1000_hw *hw = &adapter->hw;
1538 
1539         /* hardware has been reset, we need to reload some things */
1540         igbvf_configure(adapter);
1541 
1542         clear_bit(__IGBVF_DOWN, &adapter->state);
1543 
1544         napi_enable(&adapter->rx_ring->napi);
1545         if (adapter->msix_entries)
1546                 igbvf_configure_msix(adapter);
1547 
1548         /* Clear any pending interrupts. */
1549         er32(EICR);
1550         igbvf_irq_enable(adapter);
1551 
1552         /* start the watchdog */
1553         hw->mac.get_link_status = 1;
1554         mod_timer(&adapter->watchdog_timer, jiffies + 1);
1555 
1556         return 0;
1557 }
1558 
1559 void igbvf_down(struct igbvf_adapter *adapter)
1560 {
1561         struct net_device *netdev = adapter->netdev;
1562         struct e1000_hw *hw = &adapter->hw;
1563         u32 rxdctl, txdctl;
1564 
1565         /* signal that we're down so the interrupt handler does not
1566          * reschedule our watchdog timer
1567          */
1568         set_bit(__IGBVF_DOWN, &adapter->state);
1569 
1570         /* disable receives in the hardware */
1571         rxdctl = er32(RXDCTL(0));
1572         ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
1573 
1574         netif_carrier_off(netdev);
1575         netif_stop_queue(netdev);
1576 
1577         /* disable transmits in the hardware */
1578         txdctl = er32(TXDCTL(0));
1579         ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
1580 
1581         /* flush both disables and wait for them to finish */
1582         e1e_flush();
1583         msleep(10);
1584 
1585         napi_disable(&adapter->rx_ring->napi);
1586 
1587         igbvf_irq_disable(adapter);
1588 
1589         del_timer_sync(&adapter->watchdog_timer);
1590 
1591         /* record the stats before reset*/
1592         igbvf_update_stats(adapter);
1593 
1594         adapter->link_speed = 0;
1595         adapter->link_duplex = 0;
1596 
1597         igbvf_reset(adapter);
1598         igbvf_clean_tx_ring(adapter->tx_ring);
1599         igbvf_clean_rx_ring(adapter->rx_ring);
1600 }
1601 
1602 void igbvf_reinit_locked(struct igbvf_adapter *adapter)
1603 {
1604         might_sleep();
1605         while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
1606                 usleep_range(1000, 2000);
1607         igbvf_down(adapter);
1608         igbvf_up(adapter);
1609         clear_bit(__IGBVF_RESETTING, &adapter->state);
1610 }
1611 
1612 /**
1613  * igbvf_sw_init - Initialize general software structures (struct igbvf_adapter)
1614  * @adapter: board private structure to initialize
1615  *
1616  * igbvf_sw_init initializes the Adapter private data structure.
1617  * Fields are initialized based on PCI device information and
1618  * OS network device settings (MTU size).
1619  **/
1620 static int igbvf_sw_init(struct igbvf_adapter *adapter)
1621 {
1622         struct net_device *netdev = adapter->netdev;
1623         s32 rc;
1624 
1625         adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
1626         adapter->rx_ps_hdr_size = 0;
1627         adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
1628         adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
1629 
1630         adapter->tx_int_delay = 8;
1631         adapter->tx_abs_int_delay = 32;
1632         adapter->rx_int_delay = 0;
1633         adapter->rx_abs_int_delay = 8;
1634         adapter->requested_itr = 3;
1635         adapter->current_itr = IGBVF_START_ITR;
1636 
1637         /* Set various function pointers */
1638         adapter->ei->init_ops(&adapter->hw);
1639 
1640         rc = adapter->hw.mac.ops.init_params(&adapter->hw);
1641         if (rc)
1642                 return rc;
1643 
1644         rc = adapter->hw.mbx.ops.init_params(&adapter->hw);
1645         if (rc)
1646                 return rc;
1647 
1648         igbvf_set_interrupt_capability(adapter);
1649 
1650         if (igbvf_alloc_queues(adapter))
1651                 return -ENOMEM;
1652 
1653         spin_lock_init(&adapter->tx_queue_lock);
1654 
1655         /* Explicitly disable IRQ since the NIC can be in any state. */
1656         igbvf_irq_disable(adapter);
1657 
1658         spin_lock_init(&adapter->stats_lock);
1659         spin_lock_init(&adapter->hw.mbx_lock);
1660 
1661         set_bit(__IGBVF_DOWN, &adapter->state);
1662         return 0;
1663 }
1664 
1665 static void igbvf_initialize_last_counter_stats(struct igbvf_adapter *adapter)
1666 {
1667         struct e1000_hw *hw = &adapter->hw;
1668 
1669         adapter->stats.last_gprc = er32(VFGPRC);
1670         adapter->stats.last_gorc = er32(VFGORC);
1671         adapter->stats.last_gptc = er32(VFGPTC);
1672         adapter->stats.last_gotc = er32(VFGOTC);
1673         adapter->stats.last_mprc = er32(VFMPRC);
1674         adapter->stats.last_gotlbc = er32(VFGOTLBC);
1675         adapter->stats.last_gptlbc = er32(VFGPTLBC);
1676         adapter->stats.last_gorlbc = er32(VFGORLBC);
1677         adapter->stats.last_gprlbc = er32(VFGPRLBC);
1678 
1679         adapter->stats.base_gprc = er32(VFGPRC);
1680         adapter->stats.base_gorc = er32(VFGORC);
1681         adapter->stats.base_gptc = er32(VFGPTC);
1682         adapter->stats.base_gotc = er32(VFGOTC);
1683         adapter->stats.base_mprc = er32(VFMPRC);
1684         adapter->stats.base_gotlbc = er32(VFGOTLBC);
1685         adapter->stats.base_gptlbc = er32(VFGPTLBC);
1686         adapter->stats.base_gorlbc = er32(VFGORLBC);
1687         adapter->stats.base_gprlbc = er32(VFGPRLBC);
1688 }
1689 
1690 /**
1691  * igbvf_open - Called when a network interface is made active
1692  * @netdev: network interface device structure
1693  *
1694  * Returns 0 on success, negative value on failure
1695  *
1696  * The open entry point is called when a network interface is made
1697  * active by the system (IFF_UP).  At this point all resources needed
1698  * for transmit and receive operations are allocated, the interrupt
1699  * handler is registered with the OS, the watchdog timer is started,
1700  * and the stack is notified that the interface is ready.
1701  **/
1702 static int igbvf_open(struct net_device *netdev)
1703 {
1704         struct igbvf_adapter *adapter = netdev_priv(netdev);
1705         struct e1000_hw *hw = &adapter->hw;
1706         int err;
1707 
1708         /* disallow open during test */
1709         if (test_bit(__IGBVF_TESTING, &adapter->state))
1710                 return -EBUSY;
1711 
1712         /* allocate transmit descriptors */
1713         err = igbvf_setup_tx_resources(adapter, adapter->tx_ring);
1714         if (err)
1715                 goto err_setup_tx;
1716 
1717         /* allocate receive descriptors */
1718         err = igbvf_setup_rx_resources(adapter, adapter->rx_ring);
1719         if (err)
1720                 goto err_setup_rx;
1721 
1722         /* before we allocate an interrupt, we must be ready to handle it.
1723          * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
1724          * as soon as we call pci_request_irq, so we have to setup our
1725          * clean_rx handler before we do so.
1726          */
1727         igbvf_configure(adapter);
1728 
1729         err = igbvf_request_irq(adapter);
1730         if (err)
1731                 goto err_req_irq;
1732 
1733         /* From here on the code is the same as igbvf_up() */
1734         clear_bit(__IGBVF_DOWN, &adapter->state);
1735 
1736         napi_enable(&adapter->rx_ring->napi);
1737 
1738         /* clear any pending interrupts */
1739         er32(EICR);
1740 
1741         igbvf_irq_enable(adapter);
1742 
1743         /* start the watchdog */
1744         hw->mac.get_link_status = 1;
1745         mod_timer(&adapter->watchdog_timer, jiffies + 1);
1746 
1747         return 0;
1748 
1749 err_req_irq:
1750         igbvf_free_rx_resources(adapter->rx_ring);
1751 err_setup_rx:
1752         igbvf_free_tx_resources(adapter->tx_ring);
1753 err_setup_tx:
1754         igbvf_reset(adapter);
1755 
1756         return err;
1757 }
1758 
1759 /**
1760  * igbvf_close - Disables a network interface
1761  * @netdev: network interface device structure
1762  *
1763  * Returns 0, this is not allowed to fail
1764  *
1765  * The close entry point is called when an interface is de-activated
1766  * by the OS.  The hardware is still under the drivers control, but
1767  * needs to be disabled.  A global MAC reset is issued to stop the
1768  * hardware, and all transmit and receive resources are freed.
1769  **/
1770 static int igbvf_close(struct net_device *netdev)
1771 {
1772         struct igbvf_adapter *adapter = netdev_priv(netdev);
1773 
1774         WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
1775         igbvf_down(adapter);
1776 
1777         igbvf_free_irq(adapter);
1778 
1779         igbvf_free_tx_resources(adapter->tx_ring);
1780         igbvf_free_rx_resources(adapter->rx_ring);
1781 
1782         return 0;
1783 }
1784 
1785 /**
1786  * igbvf_set_mac - Change the Ethernet Address of the NIC
1787  * @netdev: network interface device structure
1788  * @p: pointer to an address structure
1789  *
1790  * Returns 0 on success, negative on failure
1791  **/
1792 static int igbvf_set_mac(struct net_device *netdev, void *p)
1793 {
1794         struct igbvf_adapter *adapter = netdev_priv(netdev);
1795         struct e1000_hw *hw = &adapter->hw;
1796         struct sockaddr *addr = p;
1797 
1798         if (!is_valid_ether_addr(addr->sa_data))
1799                 return -EADDRNOTAVAIL;
1800 
1801         memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);
1802 
1803         spin_lock_bh(&hw->mbx_lock);
1804 
1805         hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
1806 
1807         spin_unlock_bh(&hw->mbx_lock);
1808 
1809         if (!ether_addr_equal(addr->sa_data, hw->mac.addr))
1810                 return -EADDRNOTAVAIL;
1811 
1812         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1813 
1814         return 0;
1815 }
1816 
1817 #define UPDATE_VF_COUNTER(reg, name) \
1818 { \
1819         u32 current_counter = er32(reg); \
1820         if (current_counter < adapter->stats.last_##name) \
1821                 adapter->stats.name += 0x100000000LL; \
1822         adapter->stats.last_##name = current_counter; \
1823         adapter->stats.name &= 0xFFFFFFFF00000000LL; \
1824         adapter->stats.name |= current_counter; \
1825 }
1826 
1827 /**
1828  * igbvf_update_stats - Update the board statistics counters
1829  * @adapter: board private structure
1830 **/
1831 void igbvf_update_stats(struct igbvf_adapter *adapter)
1832 {
1833         struct e1000_hw *hw = &adapter->hw;
1834         struct pci_dev *pdev = adapter->pdev;
1835 
1836         /* Prevent stats update while adapter is being reset, link is down
1837          * or if the pci connection is down.
1838          */
1839         if (adapter->link_speed == 0)
1840                 return;
1841 
1842         if (test_bit(__IGBVF_RESETTING, &adapter->state))
1843                 return;
1844 
1845         if (pci_channel_offline(pdev))
1846                 return;
1847 
1848         UPDATE_VF_COUNTER(VFGPRC, gprc);
1849         UPDATE_VF_COUNTER(VFGORC, gorc);
1850         UPDATE_VF_COUNTER(VFGPTC, gptc);
1851         UPDATE_VF_COUNTER(VFGOTC, gotc);
1852         UPDATE_VF_COUNTER(VFMPRC, mprc);
1853         UPDATE_VF_COUNTER(VFGOTLBC, gotlbc);
1854         UPDATE_VF_COUNTER(VFGPTLBC, gptlbc);
1855         UPDATE_VF_COUNTER(VFGORLBC, gorlbc);
1856         UPDATE_VF_COUNTER(VFGPRLBC, gprlbc);
1857 
1858         /* Fill out the OS statistics structure */
1859         adapter->netdev->stats.multicast = adapter->stats.mprc;
1860 }
1861 
1862 static void igbvf_print_link_info(struct igbvf_adapter *adapter)
1863 {
1864         dev_info(&adapter->pdev->dev, "Link is Up %d Mbps %s Duplex\n",
1865                  adapter->link_speed,
1866                  adapter->link_duplex == FULL_DUPLEX ? "Full" : "Half");
1867 }
1868 
1869 static bool igbvf_has_link(struct igbvf_adapter *adapter)
1870 {
1871         struct e1000_hw *hw = &adapter->hw;
1872         s32 ret_val = E1000_SUCCESS;
1873         bool link_active;
1874 
1875         /* If interface is down, stay link down */
1876         if (test_bit(__IGBVF_DOWN, &adapter->state))
1877                 return false;
1878 
1879         spin_lock_bh(&hw->mbx_lock);
1880 
1881         ret_val = hw->mac.ops.check_for_link(hw);
1882 
1883         spin_unlock_bh(&hw->mbx_lock);
1884 
1885         link_active = !hw->mac.get_link_status;
1886 
1887         /* if check for link returns error we will need to reset */
1888         if (ret_val && time_after(jiffies, adapter->last_reset + (10 * HZ)))
1889                 schedule_work(&adapter->reset_task);
1890 
1891         return link_active;
1892 }
1893 
1894 /**
1895  * igbvf_watchdog - Timer Call-back
1896  * @data: pointer to adapter cast into an unsigned long
1897  **/
1898 static void igbvf_watchdog(struct timer_list *t)
1899 {
1900         struct igbvf_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1901 
1902         /* Do the rest outside of interrupt context */
1903         schedule_work(&adapter->watchdog_task);
1904 }
1905 
1906 static void igbvf_watchdog_task(struct work_struct *work)
1907 {
1908         struct igbvf_adapter *adapter = container_of(work,
1909                                                      struct igbvf_adapter,
1910                                                      watchdog_task);
1911         struct net_device *netdev = adapter->netdev;
1912         struct e1000_mac_info *mac = &adapter->hw.mac;
1913         struct igbvf_ring *tx_ring = adapter->tx_ring;
1914         struct e1000_hw *hw = &adapter->hw;
1915         u32 link;
1916         int tx_pending = 0;
1917 
1918         link = igbvf_has_link(adapter);
1919 
1920         if (link) {
1921                 if (!netif_carrier_ok(netdev)) {
1922                         mac->ops.get_link_up_info(&adapter->hw,
1923                                                   &adapter->link_speed,
1924                                                   &adapter->link_duplex);
1925                         igbvf_print_link_info(adapter);
1926 
1927                         netif_carrier_on(netdev);
1928                         netif_wake_queue(netdev);
1929                 }
1930         } else {
1931                 if (netif_carrier_ok(netdev)) {
1932                         adapter->link_speed = 0;
1933                         adapter->link_duplex = 0;
1934                         dev_info(&adapter->pdev->dev, "Link is Down\n");
1935                         netif_carrier_off(netdev);
1936                         netif_stop_queue(netdev);
1937                 }
1938         }
1939 
1940         if (netif_carrier_ok(netdev)) {
1941                 igbvf_update_stats(adapter);
1942         } else {
1943                 tx_pending = (igbvf_desc_unused(tx_ring) + 1 <
1944                               tx_ring->count);
1945                 if (tx_pending) {
1946                         /* We've lost link, so the controller stops DMA,
1947                          * but we've got queued Tx work that's never going
1948                          * to get done, so reset controller to flush Tx.
1949                          * (Do the reset outside of interrupt context).
1950                          */
1951                         adapter->tx_timeout_count++;
1952                         schedule_work(&adapter->reset_task);
1953                 }
1954         }
1955 
1956         /* Cause software interrupt to ensure Rx ring is cleaned */
1957         ew32(EICS, adapter->rx_ring->eims_value);
1958 
1959         /* Reset the timer */
1960         if (!test_bit(__IGBVF_DOWN, &adapter->state))
1961                 mod_timer(&adapter->watchdog_timer,
1962                           round_jiffies(jiffies + (2 * HZ)));
1963 }
1964 
1965 #define IGBVF_TX_FLAGS_CSUM             0x00000001
1966 #define IGBVF_TX_FLAGS_VLAN             0x00000002
1967 #define IGBVF_TX_FLAGS_TSO              0x00000004
1968 #define IGBVF_TX_FLAGS_IPV4             0x00000008
1969 #define IGBVF_TX_FLAGS_VLAN_MASK        0xffff0000
1970 #define IGBVF_TX_FLAGS_VLAN_SHIFT       16
1971 
1972 static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
1973                               u32 type_tucmd, u32 mss_l4len_idx)
1974 {
1975         struct e1000_adv_tx_context_desc *context_desc;
1976         struct igbvf_buffer *buffer_info;
1977         u16 i = tx_ring->next_to_use;
1978 
1979         context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
1980         buffer_info = &tx_ring->buffer_info[i];
1981 
1982         i++;
1983         tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
1984 
1985         /* set bits to identify this as an advanced context descriptor */
1986         type_tucmd |= E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT;
1987 
1988         context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
1989         context_desc->seqnum_seed       = 0;
1990         context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
1991         context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);
1992 
1993         buffer_info->time_stamp = jiffies;
1994         buffer_info->dma = 0;
1995 }
1996 
1997 static int igbvf_tso(struct igbvf_ring *tx_ring,
1998                      struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
1999 {
2000         u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
2001         union {
2002                 struct iphdr *v4;
2003                 struct ipv6hdr *v6;
2004                 unsigned char *hdr;
2005         } ip;
2006         union {
2007                 struct tcphdr *tcp;
2008                 unsigned char *hdr;
2009         } l4;
2010         u32 paylen, l4_offset;
2011         int err;
2012 
2013         if (skb->ip_summed != CHECKSUM_PARTIAL)
2014                 return 0;
2015 
2016         if (!skb_is_gso(skb))
2017                 return 0;
2018 
2019         err = skb_cow_head(skb, 0);
2020         if (err < 0)
2021                 return err;
2022 
2023         ip.hdr = skb_network_header(skb);
2024         l4.hdr = skb_checksum_start(skb);
2025 
2026         /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
2027         type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
2028 
2029         /* initialize outer IP header fields */
2030         if (ip.v4->version == 4) {
2031                 unsigned char *csum_start = skb_checksum_start(skb);
2032                 unsigned char *trans_start = ip.hdr + (ip.v4->ihl * 4);
2033 
2034                 /* IP header will have to cancel out any data that
2035                  * is not a part of the outer IP header
2036                  */
2037                 ip.v4->check = csum_fold(csum_partial(trans_start,
2038                                                       csum_start - trans_start,
2039                                                       0));
2040                 type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
2041 
2042                 ip.v4->tot_len = 0;
2043         } else {
2044                 ip.v6->payload_len = 0;
2045         }
2046 
2047         /* determine offset of inner transport header */
2048         l4_offset = l4.hdr - skb->data;
2049 
2050         /* compute length of segmentation header */
2051         *hdr_len = (l4.tcp->doff * 4) + l4_offset;
2052 
2053         /* remove payload length from inner checksum */
2054         paylen = skb->len - l4_offset;
2055         csum_replace_by_diff(&l4.tcp->check, htonl(paylen));
2056 
2057         /* MSS L4LEN IDX */
2058         mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
2059         mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;
2060 
2061         /* VLAN MACLEN IPLEN */
2062         vlan_macip_lens = l4.hdr - ip.hdr;
2063         vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
2064         vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
2065 
2066         igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);
2067 
2068         return 1;
2069 }
2070 
2071 static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
2072 {
2073         unsigned int offset = 0;
2074 
2075         ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
2076 
2077         return offset == skb_checksum_start_offset(skb);
2078 }
2079 
2080 static bool igbvf_tx_csum(struct igbvf_ring *tx_ring, struct sk_buff *skb,
2081                           u32 tx_flags, __be16 protocol)
2082 {
2083         u32 vlan_macip_lens = 0;
2084         u32 type_tucmd = 0;
2085 
2086         if (skb->ip_summed != CHECKSUM_PARTIAL) {
2087 csum_failed:
2088                 if (!(tx_flags & IGBVF_TX_FLAGS_VLAN))
2089                         return false;
2090                 goto no_csum;
2091         }
2092 
2093         switch (skb->csum_offset) {
2094         case offsetof(struct tcphdr, check):
2095                 type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
2096                 /* fall through */
2097         case offsetof(struct udphdr, check):
2098                 break;
2099         case offsetof(struct sctphdr, checksum):
2100                 /* validate that this is actually an SCTP request */
2101                 if (((protocol == htons(ETH_P_IP)) &&
2102                      (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
2103                     ((protocol == htons(ETH_P_IPV6)) &&
2104                      igbvf_ipv6_csum_is_sctp(skb))) {
2105                         type_tucmd = E1000_ADVTXD_TUCMD_L4T_SCTP;
2106                         break;
2107                 }
2108                 /* fall through */
2109         default:
2110                 skb_checksum_help(skb);
2111                 goto csum_failed;
2112         }
2113 
2114         vlan_macip_lens = skb_checksum_start_offset(skb) -
2115                           skb_network_offset(skb);
2116 no_csum:
2117         vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT;
2118         vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;
2119 
2120         igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
2121         return true;
2122 }
2123 
2124 static int igbvf_maybe_stop_tx(struct net_device *netdev, int size)
2125 {
2126         struct igbvf_adapter *adapter = netdev_priv(netdev);
2127 
2128         /* there is enough descriptors then we don't need to worry  */
2129         if (igbvf_desc_unused(adapter->tx_ring) >= size)
2130                 return 0;
2131 
2132         netif_stop_queue(netdev);
2133 
2134         /* Herbert's original patch had:
2135          *  smp_mb__after_netif_stop_queue();
2136          * but since that doesn't exist yet, just open code it.
2137          */
2138         smp_mb();
2139 
2140         /* We need to check again just in case room has been made available */
2141         if (igbvf_desc_unused(adapter->tx_ring) < size)
2142                 return -EBUSY;
2143 
2144         netif_wake_queue(netdev);
2145 
2146         ++adapter->restart_queue;
2147         return 0;
2148 }
2149 
2150 #define IGBVF_MAX_TXD_PWR       16
2151 #define IGBVF_MAX_DATA_PER_TXD  (1u << IGBVF_MAX_TXD_PWR)
2152 
2153 static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
2154                                    struct igbvf_ring *tx_ring,
2155                                    struct sk_buff *skb)
2156 {
2157         struct igbvf_buffer *buffer_info;
2158         struct pci_dev *pdev = adapter->pdev;
2159         unsigned int len = skb_headlen(skb);
2160         unsigned int count = 0, i;
2161         unsigned int f;
2162 
2163         i = tx_ring->next_to_use;
2164 
2165         buffer_info = &tx_ring->buffer_info[i];
2166         BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
2167         buffer_info->length = len;
2168         /* set time_stamp *before* dma to help avoid a possible race */
2169         buffer_info->time_stamp = jiffies;
2170         buffer_info->mapped_as_page = false;
2171         buffer_info->dma = dma_map_single(&pdev->dev, skb->data, len,
2172                                           DMA_TO_DEVICE);
2173         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2174                 goto dma_error;
2175 
2176         for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
2177                 const skb_frag_t *frag;
2178 
2179                 count++;
2180                 i++;
2181                 if (i == tx_ring->count)
2182                         i = 0;
2183 
2184                 frag = &skb_shinfo(skb)->frags[f];
2185                 len = skb_frag_size(frag);
2186 
2187                 buffer_info = &tx_ring->buffer_info[i];
2188                 BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
2189                 buffer_info->length = len;
2190                 buffer_info->time_stamp = jiffies;
2191                 buffer_info->mapped_as_page = true;
2192                 buffer_info->dma = skb_frag_dma_map(&pdev->dev, frag, 0, len,
2193                                                     DMA_TO_DEVICE);
2194                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2195                         goto dma_error;
2196         }
2197 
2198         tx_ring->buffer_info[i].skb = skb;
2199 
2200         return ++count;
2201 
2202 dma_error:
2203         dev_err(&pdev->dev, "TX DMA map failed\n");
2204 
2205         /* clear timestamp and dma mappings for failed buffer_info mapping */
2206         buffer_info->dma = 0;
2207         buffer_info->time_stamp = 0;
2208         buffer_info->length = 0;
2209         buffer_info->mapped_as_page = false;
2210         if (count)
2211                 count--;
2212 
2213         /* clear timestamp and dma mappings for remaining portion of packet */
2214         while (count--) {
2215                 if (i == 0)
2216                         i += tx_ring->count;
2217                 i--;
2218                 buffer_info = &tx_ring->buffer_info[i];
2219                 igbvf_put_txbuf(adapter, buffer_info);
2220         }
2221 
2222         return 0;
2223 }
2224 
2225 static inline void igbvf_tx_queue_adv(struct igbvf_adapter *adapter,
2226                                       struct igbvf_ring *tx_ring,
2227                                       int tx_flags, int count,
2228                                       unsigned int first, u32 paylen,
2229                                       u8 hdr_len)
2230 {
2231         union e1000_adv_tx_desc *tx_desc = NULL;
2232         struct igbvf_buffer *buffer_info;
2233         u32 olinfo_status = 0, cmd_type_len;
2234         unsigned int i;
2235 
2236         cmd_type_len = (E1000_ADVTXD_DTYP_DATA | E1000_ADVTXD_DCMD_IFCS |
2237                         E1000_ADVTXD_DCMD_DEXT);
2238 
2239         if (tx_flags & IGBVF_TX_FLAGS_VLAN)
2240                 cmd_type_len |= E1000_ADVTXD_DCMD_VLE;
2241 
2242         if (tx_flags & IGBVF_TX_FLAGS_TSO) {
2243                 cmd_type_len |= E1000_ADVTXD_DCMD_TSE;
2244 
2245                 /* insert tcp checksum */
2246                 olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
2247 
2248                 /* insert ip checksum */
2249                 if (tx_flags & IGBVF_TX_FLAGS_IPV4)
2250                         olinfo_status |= E1000_TXD_POPTS_IXSM << 8;
2251 
2252         } else if (tx_flags & IGBVF_TX_FLAGS_CSUM) {
2253                 olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
2254         }
2255 
2256         olinfo_status |= ((paylen - hdr_len) << E1000_ADVTXD_PAYLEN_SHIFT);
2257 
2258         i = tx_ring->next_to_use;
2259         while (count--) {
2260                 buffer_info = &tx_ring->buffer_info[i];
2261                 tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
2262                 tx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);
2263                 tx_desc->read.cmd_type_len =
2264                          cpu_to_le32(cmd_type_len | buffer_info->length);
2265                 tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
2266                 i++;
2267                 if (i == tx_ring->count)
2268                         i = 0;
2269         }
2270 
2271         tx_desc->read.cmd_type_len |= cpu_to_le32(adapter->txd_cmd);
2272         /* Force memory writes to complete before letting h/w
2273          * know there are new descriptors to fetch.  (Only
2274          * applicable for weak-ordered memory model archs,
2275          * such as IA-64).
2276          */
2277         wmb();
2278 
2279         tx_ring->buffer_info[first].next_to_watch = tx_desc;
2280         tx_ring->next_to_use = i;
2281         writel(i, adapter->hw.hw_addr + tx_ring->tail);
2282 }
2283 
2284 static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
2285                                              struct net_device *netdev,
2286                                              struct igbvf_ring *tx_ring)
2287 {
2288         struct igbvf_adapter *adapter = netdev_priv(netdev);
2289         unsigned int first, tx_flags = 0;
2290         u8 hdr_len = 0;
2291         int count = 0;
2292         int tso = 0;
2293         __be16 protocol = vlan_get_protocol(skb);
2294 
2295         if (test_bit(__IGBVF_DOWN, &adapter->state)) {
2296                 dev_kfree_skb_any(skb);
2297                 return NETDEV_TX_OK;
2298         }
2299 
2300         if (skb->len <= 0) {
2301                 dev_kfree_skb_any(skb);
2302                 return NETDEV_TX_OK;
2303         }
2304 
2305         /* need: count + 4 desc gap to keep tail from touching
2306          *       + 2 desc gap to keep tail from touching head,
2307          *       + 1 desc for skb->data,
2308          *       + 1 desc for context descriptor,
2309          * head, otherwise try next time
2310          */
2311         if (igbvf_maybe_stop_tx(netdev, skb_shinfo(skb)->nr_frags + 4)) {
2312                 /* this is a hard error */
2313                 return NETDEV_TX_BUSY;
2314         }
2315 
2316         if (skb_vlan_tag_present(skb)) {
2317                 tx_flags |= IGBVF_TX_FLAGS_VLAN;
2318                 tx_flags |= (skb_vlan_tag_get(skb) <<
2319                              IGBVF_TX_FLAGS_VLAN_SHIFT);
2320         }
2321 
2322         if (protocol == htons(ETH_P_IP))
2323                 tx_flags |= IGBVF_TX_FLAGS_IPV4;
2324 
2325         first = tx_ring->next_to_use;
2326 
2327         tso = igbvf_tso(tx_ring, skb, tx_flags, &hdr_len);
2328         if (unlikely(tso < 0)) {
2329                 dev_kfree_skb_any(skb);
2330                 return NETDEV_TX_OK;
2331         }
2332 
2333         if (tso)
2334                 tx_flags |= IGBVF_TX_FLAGS_TSO;
2335         else if (igbvf_tx_csum(tx_ring, skb, tx_flags, protocol) &&
2336                  (skb->ip_summed == CHECKSUM_PARTIAL))
2337                 tx_flags |= IGBVF_TX_FLAGS_CSUM;
2338 
2339         /* count reflects descriptors mapped, if 0 then mapping error
2340          * has occurred and we need to rewind the descriptor queue
2341          */
2342         count = igbvf_tx_map_adv(adapter, tx_ring, skb);
2343 
2344         if (count) {
2345                 igbvf_tx_queue_adv(adapter, tx_ring, tx_flags, count,
2346                                    first, skb->len, hdr_len);
2347                 /* Make sure there is space in the ring for the next send. */
2348                 igbvf_maybe_stop_tx(netdev, MAX_SKB_FRAGS + 4);
2349         } else {
2350                 dev_kfree_skb_any(skb);
2351                 tx_ring->buffer_info[first].time_stamp = 0;
2352                 tx_ring->next_to_use = first;
2353         }
2354 
2355         return NETDEV_TX_OK;
2356 }
2357 
2358 static netdev_tx_t igbvf_xmit_frame(struct sk_buff *skb,
2359                                     struct net_device *netdev)
2360 {
2361         struct igbvf_adapter *adapter = netdev_priv(netdev);
2362         struct igbvf_ring *tx_ring;
2363 
2364         if (test_bit(__IGBVF_DOWN, &adapter->state)) {
2365                 dev_kfree_skb_any(skb);
2366                 return NETDEV_TX_OK;
2367         }
2368 
2369         tx_ring = &adapter->tx_ring[0];
2370 
2371         return igbvf_xmit_frame_ring_adv(skb, netdev, tx_ring);
2372 }
2373 
2374 /**
2375  * igbvf_tx_timeout - Respond to a Tx Hang
2376  * @netdev: network interface device structure
2377  **/
2378 static void igbvf_tx_timeout(struct net_device *netdev)
2379 {
2380         struct igbvf_adapter *adapter = netdev_priv(netdev);
2381 
2382         /* Do the reset outside of interrupt context */
2383         adapter->tx_timeout_count++;
2384         schedule_work(&adapter->reset_task);
2385 }
2386 
2387 static void igbvf_reset_task(struct work_struct *work)
2388 {
2389         struct igbvf_adapter *adapter;
2390 
2391         adapter = container_of(work, struct igbvf_adapter, reset_task);
2392 
2393         igbvf_reinit_locked(adapter);
2394 }
2395 
2396 /**
2397  * igbvf_change_mtu - Change the Maximum Transfer Unit
2398  * @netdev: network interface device structure
2399  * @new_mtu: new value for maximum frame size
2400  *
2401  * Returns 0 on success, negative on failure
2402  **/
2403 static int igbvf_change_mtu(struct net_device *netdev, int new_mtu)
2404 {
2405         struct igbvf_adapter *adapter = netdev_priv(netdev);
2406         int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
2407 
2408         while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
2409                 usleep_range(1000, 2000);
2410         /* igbvf_down has a dependency on max_frame_size */
2411         adapter->max_frame_size = max_frame;
2412         if (netif_running(netdev))
2413                 igbvf_down(adapter);
2414 
2415         /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
2416          * means we reserve 2 more, this pushes us to allocate from the next
2417          * larger slab size.
2418          * i.e. RXBUFFER_2048 --> size-4096 slab
2419          * However with the new *_jumbo_rx* routines, jumbo receives will use
2420          * fragmented skbs
2421          */
2422 
2423         if (max_frame <= 1024)
2424                 adapter->rx_buffer_len = 1024;
2425         else if (max_frame <= 2048)
2426                 adapter->rx_buffer_len = 2048;
2427         else
2428 #if (PAGE_SIZE / 2) > 16384
2429                 adapter->rx_buffer_len = 16384;
2430 #else
2431                 adapter->rx_buffer_len = PAGE_SIZE / 2;
2432 #endif
2433 
2434         /* adjust allocation if LPE protects us, and we aren't using SBP */
2435         if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
2436             (max_frame == ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN))
2437                 adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN +
2438                                          ETH_FCS_LEN;
2439 
2440         dev_info(&adapter->pdev->dev, "changing MTU from %d to %d\n",
2441                  netdev->mtu, new_mtu);
2442         netdev->mtu = new_mtu;
2443 
2444         if (netif_running(netdev))
2445                 igbvf_up(adapter);
2446         else
2447                 igbvf_reset(adapter);
2448 
2449         clear_bit(__IGBVF_RESETTING, &adapter->state);
2450 
2451         return 0;
2452 }
2453 
2454 static int igbvf_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
2455 {
2456         switch (cmd) {
2457         default:
2458                 return -EOPNOTSUPP;
2459         }
2460 }
2461 
2462 static int igbvf_suspend(struct pci_dev *pdev, pm_message_t state)
2463 {
2464         struct net_device *netdev = pci_get_drvdata(pdev);
2465         struct igbvf_adapter *adapter = netdev_priv(netdev);
2466 #ifdef CONFIG_PM
2467         int retval = 0;
2468 #endif
2469 
2470         netif_device_detach(netdev);
2471 
2472         if (netif_running(netdev)) {
2473                 WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
2474                 igbvf_down(adapter);
2475                 igbvf_free_irq(adapter);
2476         }
2477 
2478 #ifdef CONFIG_PM
2479         retval = pci_save_state(pdev);
2480         if (retval)
2481                 return retval;
2482 #endif
2483 
2484         pci_disable_device(pdev);
2485 
2486         return 0;
2487 }
2488 
2489 #ifdef CONFIG_PM
2490 static int igbvf_resume(struct pci_dev *pdev)
2491 {
2492         struct net_device *netdev = pci_get_drvdata(pdev);
2493         struct igbvf_adapter *adapter = netdev_priv(netdev);
2494         u32 err;
2495 
2496         pci_restore_state(pdev);
2497         err = pci_enable_device_mem(pdev);
2498         if (err) {
2499                 dev_err(&pdev->dev, "Cannot enable PCI device from suspend\n");
2500                 return err;
2501         }
2502 
2503         pci_set_master(pdev);
2504 
2505         if (netif_running(netdev)) {
2506                 err = igbvf_request_irq(adapter);
2507                 if (err)
2508                         return err;
2509         }
2510 
2511         igbvf_reset(adapter);
2512 
2513         if (netif_running(netdev))
2514                 igbvf_up(adapter);
2515 
2516         netif_device_attach(netdev);
2517 
2518         return 0;
2519 }
2520 #endif
2521 
2522 static void igbvf_shutdown(struct pci_dev *pdev)
2523 {
2524         igbvf_suspend(pdev, PMSG_SUSPEND);
2525 }
2526 
2527 #ifdef CONFIG_NET_POLL_CONTROLLER
2528 /* Polling 'interrupt' - used by things like netconsole to send skbs
2529  * without having to re-enable interrupts. It's not called while
2530  * the interrupt routine is executing.
2531  */
2532 static void igbvf_netpoll(struct net_device *netdev)
2533 {
2534         struct igbvf_adapter *adapter = netdev_priv(netdev);
2535 
2536         disable_irq(adapter->pdev->irq);
2537 
2538         igbvf_clean_tx_irq(adapter->tx_ring);
2539 
2540         enable_irq(adapter->pdev->irq);
2541 }
2542 #endif
2543 
2544 /**
2545  * igbvf_io_error_detected - called when PCI error is detected
2546  * @pdev: Pointer to PCI device
2547  * @state: The current pci connection state
2548  *
2549  * This function is called after a PCI bus error affecting
2550  * this device has been detected.
2551  */
2552 static pci_ers_result_t igbvf_io_error_detected(struct pci_dev *pdev,
2553                                                 pci_channel_state_t state)
2554 {
2555         struct net_device *netdev = pci_get_drvdata(pdev);
2556         struct igbvf_adapter *adapter = netdev_priv(netdev);
2557 
2558         netif_device_detach(netdev);
2559 
2560         if (state == pci_channel_io_perm_failure)
2561                 return PCI_ERS_RESULT_DISCONNECT;
2562 
2563         if (netif_running(netdev))
2564                 igbvf_down(adapter);
2565         pci_disable_device(pdev);
2566 
2567         /* Request a slot slot reset. */
2568         return PCI_ERS_RESULT_NEED_RESET;
2569 }
2570 
2571 /**
2572  * igbvf_io_slot_reset - called after the pci bus has been reset.
2573  * @pdev: Pointer to PCI device
2574  *
2575  * Restart the card from scratch, as if from a cold-boot. Implementation
2576  * resembles the first-half of the igbvf_resume routine.
2577  */
2578 static pci_ers_result_t igbvf_io_slot_reset(struct pci_dev *pdev)
2579 {
2580         struct net_device *netdev = pci_get_drvdata(pdev);
2581         struct igbvf_adapter *adapter = netdev_priv(netdev);
2582 
2583         if (pci_enable_device_mem(pdev)) {
2584                 dev_err(&pdev->dev,
2585                         "Cannot re-enable PCI device after reset.\n");
2586                 return PCI_ERS_RESULT_DISCONNECT;
2587         }
2588         pci_set_master(pdev);
2589 
2590         igbvf_reset(adapter);
2591 
2592         return PCI_ERS_RESULT_RECOVERED;
2593 }
2594 
2595 /**
2596  * igbvf_io_resume - called when traffic can start flowing again.
2597  * @pdev: Pointer to PCI device
2598  *
2599  * This callback is called when the error recovery driver tells us that
2600  * its OK to resume normal operation. Implementation resembles the
2601  * second-half of the igbvf_resume routine.
2602  */
2603 static void igbvf_io_resume(struct pci_dev *pdev)
2604 {
2605         struct net_device *netdev = pci_get_drvdata(pdev);
2606         struct igbvf_adapter *adapter = netdev_priv(netdev);
2607 
2608         if (netif_running(netdev)) {
2609                 if (igbvf_up(adapter)) {
2610                         dev_err(&pdev->dev,
2611                                 "can't bring device back up after reset\n");
2612                         return;
2613                 }
2614         }
2615 
2616         netif_device_attach(netdev);
2617 }
2618 
2619 static void igbvf_print_device_info(struct igbvf_adapter *adapter)
2620 {
2621         struct e1000_hw *hw = &adapter->hw;
2622         struct net_device *netdev = adapter->netdev;
2623         struct pci_dev *pdev = adapter->pdev;
2624 
2625         if (hw->mac.type == e1000_vfadapt_i350)
2626                 dev_info(&pdev->dev, "Intel(R) I350 Virtual Function\n");
2627         else
2628                 dev_info(&pdev->dev, "Intel(R) 82576 Virtual Function\n");
2629         dev_info(&pdev->dev, "Address: %pM\n", netdev->dev_addr);
2630 }
2631 
2632 static int igbvf_set_features(struct net_device *netdev,
2633                               netdev_features_t features)
2634 {
2635         struct igbvf_adapter *adapter = netdev_priv(netdev);
2636 
2637         if (features & NETIF_F_RXCSUM)
2638                 adapter->flags &= ~IGBVF_FLAG_RX_CSUM_DISABLED;
2639         else
2640                 adapter->flags |= IGBVF_FLAG_RX_CSUM_DISABLED;
2641 
2642         return 0;
2643 }
2644 
2645 #define IGBVF_MAX_MAC_HDR_LEN           127
2646 #define IGBVF_MAX_NETWORK_HDR_LEN       511
2647 
2648 static netdev_features_t
2649 igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
2650                      netdev_features_t features)
2651 {
2652         unsigned int network_hdr_len, mac_hdr_len;
2653 
2654         /* Make certain the headers can be described by a context descriptor */
2655         mac_hdr_len = skb_network_header(skb) - skb->data;
2656         if (unlikely(mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN))
2657                 return features & ~(NETIF_F_HW_CSUM |
2658                                     NETIF_F_SCTP_CRC |
2659                                     NETIF_F_HW_VLAN_CTAG_TX |
2660                                     NETIF_F_TSO |
2661                                     NETIF_F_TSO6);
2662 
2663         network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
2664         if (unlikely(network_hdr_len >  IGBVF_MAX_NETWORK_HDR_LEN))
2665                 return features & ~(NETIF_F_HW_CSUM |
2666                                     NETIF_F_SCTP_CRC |
2667                                     NETIF_F_TSO |
2668                                     NETIF_F_TSO6);
2669 
2670         /* We can only support IPV4 TSO in tunnels if we can mangle the
2671          * inner IP ID field, so strip TSO if MANGLEID is not supported.
2672          */
2673         if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
2674                 features &= ~NETIF_F_TSO;
2675 
2676         return features;
2677 }
2678 
2679 static const struct net_device_ops igbvf_netdev_ops = {
2680         .ndo_open               = igbvf_open,
2681         .ndo_stop               = igbvf_close,
2682         .ndo_start_xmit         = igbvf_xmit_frame,
2683         .ndo_set_rx_mode        = igbvf_set_rx_mode,
2684         .ndo_set_mac_address    = igbvf_set_mac,
2685         .ndo_change_mtu         = igbvf_change_mtu,
2686         .ndo_do_ioctl           = igbvf_ioctl,
2687         .ndo_tx_timeout         = igbvf_tx_timeout,
2688         .ndo_vlan_rx_add_vid    = igbvf_vlan_rx_add_vid,
2689         .ndo_vlan_rx_kill_vid   = igbvf_vlan_rx_kill_vid,
2690 #ifdef CONFIG_NET_POLL_CONTROLLER
2691         .ndo_poll_controller    = igbvf_netpoll,
2692 #endif
2693         .ndo_set_features       = igbvf_set_features,
2694         .ndo_features_check     = igbvf_features_check,
2695 };
2696 
2697 /**
2698  * igbvf_probe - Device Initialization Routine
2699  * @pdev: PCI device information struct
2700  * @ent: entry in igbvf_pci_tbl
2701  *
2702  * Returns 0 on success, negative on failure
2703  *
2704  * igbvf_probe initializes an adapter identified by a pci_dev structure.
2705  * The OS initialization, configuring of the adapter private structure,
2706  * and a hardware reset occur.
2707  **/
2708 static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2709 {
2710         struct net_device *netdev;
2711         struct igbvf_adapter *adapter;
2712         struct e1000_hw *hw;
2713         const struct igbvf_info *ei = igbvf_info_tbl[ent->driver_data];
2714 
2715         static int cards_found;
2716         int err, pci_using_dac;
2717 
2718         err = pci_enable_device_mem(pdev);
2719         if (err)
2720                 return err;
2721 
2722         pci_using_dac = 0;
2723         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
2724         if (!err) {
2725                 pci_using_dac = 1;
2726         } else {
2727                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
2728                 if (err) {
2729                         dev_err(&pdev->dev,
2730                                 "No usable DMA configuration, aborting\n");
2731                         goto err_dma;
2732                 }
2733         }
2734 
2735         err = pci_request_regions(pdev, igbvf_driver_name);
2736         if (err)
2737                 goto err_pci_reg;
2738 
2739         pci_set_master(pdev);
2740 
2741         err = -ENOMEM;
2742         netdev = alloc_etherdev(sizeof(struct igbvf_adapter));
2743         if (!netdev)
2744                 goto err_alloc_etherdev;
2745 
2746         SET_NETDEV_DEV(netdev, &pdev->dev);
2747 
2748         pci_set_drvdata(pdev, netdev);
2749         adapter = netdev_priv(netdev);
2750         hw = &adapter->hw;
2751         adapter->netdev = netdev;
2752         adapter->pdev = pdev;
2753         adapter->ei = ei;
2754         adapter->pba = ei->pba;
2755         adapter->flags = ei->flags;
2756         adapter->hw.back = adapter;
2757         adapter->hw.mac.type = ei->mac;
2758         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
2759 
2760         /* PCI config space info */
2761 
2762         hw->vendor_id = pdev->vendor;
2763         hw->device_id = pdev->device;
2764         hw->subsystem_vendor_id = pdev->subsystem_vendor;
2765         hw->subsystem_device_id = pdev->subsystem_device;
2766         hw->revision_id = pdev->revision;
2767 
2768         err = -EIO;
2769         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0),
2770                                       pci_resource_len(pdev, 0));
2771 
2772         if (!adapter->hw.hw_addr)
2773                 goto err_ioremap;
2774 
2775         if (ei->get_variants) {
2776                 err = ei->get_variants(adapter);
2777                 if (err)
2778                         goto err_get_variants;
2779         }
2780 
2781         /* setup adapter struct */
2782         err = igbvf_sw_init(adapter);
2783         if (err)
2784                 goto err_sw_init;
2785 
2786         /* construct the net_device struct */
2787         netdev->netdev_ops = &igbvf_netdev_ops;
2788 
2789         igbvf_set_ethtool_ops(netdev);
2790         netdev->watchdog_timeo = 5 * HZ;
2791         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
2792 
2793         adapter->bd_number = cards_found++;
2794 
2795         netdev->hw_features = NETIF_F_SG |
2796                               NETIF_F_TSO |
2797                               NETIF_F_TSO6 |
2798                               NETIF_F_RXCSUM |
2799                               NETIF_F_HW_CSUM |
2800                               NETIF_F_SCTP_CRC;
2801 
2802 #define IGBVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
2803                                     NETIF_F_GSO_GRE_CSUM | \
2804                                     NETIF_F_GSO_IPXIP4 | \
2805                                     NETIF_F_GSO_IPXIP6 | \
2806                                     NETIF_F_GSO_UDP_TUNNEL | \
2807                                     NETIF_F_GSO_UDP_TUNNEL_CSUM)
2808 
2809         netdev->gso_partial_features = IGBVF_GSO_PARTIAL_FEATURES;
2810         netdev->hw_features |= NETIF_F_GSO_PARTIAL |
2811                                IGBVF_GSO_PARTIAL_FEATURES;
2812 
2813         netdev->features = netdev->hw_features;
2814 
2815         if (pci_using_dac)
2816                 netdev->features |= NETIF_F_HIGHDMA;
2817 
2818         netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
2819         netdev->mpls_features |= NETIF_F_HW_CSUM;
2820         netdev->hw_enc_features |= netdev->vlan_features;
2821 
2822         /* set this bit last since it cannot be part of vlan_features */
2823         netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
2824                             NETIF_F_HW_VLAN_CTAG_RX |
2825                             NETIF_F_HW_VLAN_CTAG_TX;
2826 
2827         /* MTU range: 68 - 9216 */
2828         netdev->min_mtu = ETH_MIN_MTU;
2829         netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;
2830 
2831         spin_lock_bh(&hw->mbx_lock);
2832 
2833         /*reset the controller to put the device in a known good state */
2834         err = hw->mac.ops.reset_hw(hw);
2835         if (err) {
2836                 dev_info(&pdev->dev,
2837                          "PF still in reset state. Is the PF interface up?\n");
2838         } else {
2839                 err = hw->mac.ops.read_mac_addr(hw);
2840                 if (err)
2841                         dev_info(&pdev->dev, "Error reading MAC address.\n");
2842                 else if (is_zero_ether_addr(adapter->hw.mac.addr))
2843                         dev_info(&pdev->dev,
2844                                  "MAC address not assigned by administrator.\n");
2845                 memcpy(netdev->dev_addr, adapter->hw.mac.addr,
2846                        netdev->addr_len);
2847         }
2848 
2849         spin_unlock_bh(&hw->mbx_lock);
2850 
2851         if (!is_valid_ether_addr(netdev->dev_addr)) {
2852                 dev_info(&pdev->dev, "Assigning random MAC address.\n");
2853                 eth_hw_addr_random(netdev);
2854                 memcpy(adapter->hw.mac.addr, netdev->dev_addr,
2855                        netdev->addr_len);
2856         }
2857 
2858         timer_setup(&adapter->watchdog_timer, igbvf_watchdog, 0);
2859 
2860         INIT_WORK(&adapter->reset_task, igbvf_reset_task);
2861         INIT_WORK(&adapter->watchdog_task, igbvf_watchdog_task);
2862 
2863         /* ring size defaults */
2864         adapter->rx_ring->count = 1024;
2865         adapter->tx_ring->count = 1024;
2866 
2867         /* reset the hardware with the new settings */
2868         igbvf_reset(adapter);
2869 
2870         /* set hardware-specific flags */
2871         if (adapter->hw.mac.type == e1000_vfadapt_i350)
2872                 adapter->flags |= IGBVF_FLAG_RX_LB_VLAN_BSWAP;
2873 
2874         strcpy(netdev->name, "eth%d");
2875         err = register_netdev(netdev);
2876         if (err)
2877                 goto err_hw_init;
2878 
2879         /* tell the stack to leave us alone until igbvf_open() is called */
2880         netif_carrier_off(netdev);
2881         netif_stop_queue(netdev);
2882 
2883         igbvf_print_device_info(adapter);
2884 
2885         igbvf_initialize_last_counter_stats(adapter);
2886 
2887         return 0;
2888 
2889 err_hw_init:
2890         kfree(adapter->tx_ring);
2891         kfree(adapter->rx_ring);
2892 err_sw_init:
2893         igbvf_reset_interrupt_capability(adapter);
2894 err_get_variants:
2895         iounmap(adapter->hw.hw_addr);
2896 err_ioremap:
2897         free_netdev(netdev);
2898 err_alloc_etherdev:
2899         pci_release_regions(pdev);
2900 err_pci_reg:
2901 err_dma:
2902         pci_disable_device(pdev);
2903         return err;
2904 }
2905 
2906 /**
2907  * igbvf_remove - Device Removal Routine
2908  * @pdev: PCI device information struct
2909  *
2910  * igbvf_remove is called by the PCI subsystem to alert the driver
2911  * that it should release a PCI device.  The could be caused by a
2912  * Hot-Plug event, or because the driver is going to be removed from
2913  * memory.
2914  **/
2915 static void igbvf_remove(struct pci_dev *pdev)
2916 {
2917         struct net_device *netdev = pci_get_drvdata(pdev);
2918         struct igbvf_adapter *adapter = netdev_priv(netdev);
2919         struct e1000_hw *hw = &adapter->hw;
2920 
2921         /* The watchdog timer may be rescheduled, so explicitly
2922          * disable it from being rescheduled.
2923          */
2924         set_bit(__IGBVF_DOWN, &adapter->state);
2925         del_timer_sync(&adapter->watchdog_timer);
2926 
2927         cancel_work_sync(&adapter->reset_task);
2928         cancel_work_sync(&adapter->watchdog_task);
2929 
2930         unregister_netdev(netdev);
2931 
2932         igbvf_reset_interrupt_capability(adapter);
2933 
2934         /* it is important to delete the NAPI struct prior to freeing the
2935          * Rx ring so that you do not end up with null pointer refs
2936          */
2937         netif_napi_del(&adapter->rx_ring->napi);
2938         kfree(adapter->tx_ring);
2939         kfree(adapter->rx_ring);
2940 
2941         iounmap(hw->hw_addr);
2942         if (hw->flash_address)
2943                 iounmap(hw->flash_address);
2944         pci_release_regions(pdev);
2945 
2946         free_netdev(netdev);
2947 
2948         pci_disable_device(pdev);
2949 }
2950 
2951 /* PCI Error Recovery (ERS) */
2952 static const struct pci_error_handlers igbvf_err_handler = {
2953         .error_detected = igbvf_io_error_detected,
2954         .slot_reset = igbvf_io_slot_reset,
2955         .resume = igbvf_io_resume,
2956 };
2957 
2958 static const struct pci_device_id igbvf_pci_tbl[] = {
2959         { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_VF), board_vf },
2960         { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_VF), board_i350_vf },
2961         { } /* terminate list */
2962 };
2963 MODULE_DEVICE_TABLE(pci, igbvf_pci_tbl);
2964 
2965 /* PCI Device API Driver */
2966 static struct pci_driver igbvf_driver = {
2967         .name           = igbvf_driver_name,
2968         .id_table       = igbvf_pci_tbl,
2969         .probe          = igbvf_probe,
2970         .remove         = igbvf_remove,
2971 #ifdef CONFIG_PM
2972         /* Power Management Hooks */
2973         .suspend        = igbvf_suspend,
2974         .resume         = igbvf_resume,
2975 #endif
2976         .shutdown       = igbvf_shutdown,
2977         .err_handler    = &igbvf_err_handler
2978 };
2979 
2980 /**
2981  * igbvf_init_module - Driver Registration Routine
2982  *
2983  * igbvf_init_module is the first routine called when the driver is
2984  * loaded. All it does is register with the PCI subsystem.
2985  **/
2986 static int __init igbvf_init_module(void)
2987 {
2988         int ret;
2989 
2990         pr_info("%s - version %s\n", igbvf_driver_string, igbvf_driver_version);
2991         pr_info("%s\n", igbvf_copyright);
2992 
2993         ret = pci_register_driver(&igbvf_driver);
2994 
2995         return ret;
2996 }
2997 module_init(igbvf_init_module);
2998 
2999 /**
3000  * igbvf_exit_module - Driver Exit Cleanup Routine
3001  *
3002  * igbvf_exit_module is called just before the driver is removed
3003  * from memory.
3004  **/
3005 static void __exit igbvf_exit_module(void)
3006 {
3007         pci_unregister_driver(&igbvf_driver);
3008 }
3009 module_exit(igbvf_exit_module);
3010 
3011 MODULE_AUTHOR("Intel Corporation, <e1000-devel@lists.sourceforge.net>");
3012 MODULE_DESCRIPTION("Intel(R) Gigabit Virtual Function Network Driver");
3013 MODULE_LICENSE("GPL v2");
3014 MODULE_VERSION(DRV_VERSION);
3015 
3016 /* netdev.c */
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/ethernet/intel/igbvf/netdev.c

DEFINITIONS
