ceph/src/dpdk/lib/librte_eal/linuxapp/kni/kni_net.c

   1 /*-
   2  * GPL LICENSE SUMMARY
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of version 2 of the GNU General Public License as
   8  *   published by the Free Software Foundation.
   9  *
  10  *   This program is distributed in the hope that it will be useful, but
  11  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *   General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  *   The full GNU General Public License is included in this distribution
  19  *   in the file called LICENSE.GPL.
  20  *
  21  *   Contact Information:
  22  *   Intel Corporation
  23  */
  24
  25 /*
  26  * This code is inspired from the book "Linux Device Drivers" by
  27  * Alessandro Rubini and Jonathan Corbet, published by O'Reilly & Associates
  28  */
  29
  30 #include <linux/device.h>
  31 #include <linux/module.h>
  32 #include <linux/version.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h> /* eth_type_trans */
  35 #include <linux/skbuff.h>
  36 #include <linux/kthread.h>
  37 #include <linux/delay.h>
  38
  39 #include <exec-env/rte_kni_common.h>
  40 #include <kni_fifo.h>
  41
  42 #include "compat.h"
  43 #include "kni_dev.h"
  44
  45 #define WD_TIMEOUT 5 /*jiffies */
  46
  47 #define KNI_WAIT_RESPONSE_TIMEOUT 300 /* 3 seconds */
  48
  49 /* typedef for rx function */
  50 typedef void (*kni_net_rx_t)(struct kni_dev *kni);
  51
  52 static void kni_net_rx_normal(struct kni_dev *kni);
  53
  54 /* kni rx function pointer, with default to normal rx */
  55 static kni_net_rx_t kni_net_rx_func = kni_net_rx_normal;
  56
  57 /* physical address to kernel virtual address */
  58 static void *
  59 pa2kva(void *pa)
  60 {
  61         return phys_to_virt((unsigned long)pa);
  62 }
  63
  64 /* physical address to virtual address */
  65 static void *
  66 pa2va(void *pa, struct rte_kni_mbuf *m)
  67 {
  68         void *va;
  69
  70         va = (void *)((unsigned long)pa +
  71                         (unsigned long)m->buf_addr -
  72                         (unsigned long)m->buf_physaddr);
  73         return va;
  74 }
  75
  76 /* mbuf data kernel virtual address from mbuf kernel virtual address */
  77 static void *
  78 kva2data_kva(struct rte_kni_mbuf *m)
  79 {
  80         return phys_to_virt(m->buf_physaddr + m->data_off);
  81 }
  82
  83 /* virtual address to physical address */
  84 static void *
  85 va2pa(void *va, struct rte_kni_mbuf *m)
  86 {
  87         void *pa;
  88
  89         pa = (void *)((unsigned long)va -
  90                         ((unsigned long)m->buf_addr -
  91                          (unsigned long)m->buf_physaddr));
  92         return pa;
  93 }
  94
  95 /*
  96  * It can be called to process the request.
  97  */
  98 static int
  99 kni_net_process_request(struct kni_dev *kni, struct rte_kni_request *req)
 100 {
 101         int ret = -1;
 102         void *resp_va;
 103         uint32_t num;
 104         int ret_val;
 105
 106         if (!kni || !req) {
 107                 pr_err("No kni instance or request\n");
 108                 return -EINVAL;
 109         }
 110
 111         mutex_lock(&kni->sync_lock);
 112
 113         /* Construct data */
 114         memcpy(kni->sync_kva, req, sizeof(struct rte_kni_request));
 115         num = kni_fifo_put(kni->req_q, &kni->sync_va, 1);
 116         if (num < 1) {
 117                 pr_err("Cannot send to req_q\n");
 118                 ret = -EBUSY;
 119                 goto fail;
 120         }
 121
 122         ret_val = wait_event_interruptible_timeout(kni->wq,
 123                         kni_fifo_count(kni->resp_q), 3 * HZ);
 124         if (signal_pending(current) || ret_val <= 0) {
 125                 ret = -ETIME;
 126                 goto fail;
 127         }
 128         num = kni_fifo_get(kni->resp_q, (void **)&resp_va, 1);
 129         if (num != 1 || resp_va != kni->sync_va) {
 130                 /* This should never happen */
 131                 pr_err("No data in resp_q\n");
 132                 ret = -ENODATA;
 133                 goto fail;
 134         }
 135
 136         memcpy(req, kni->sync_kva, sizeof(struct rte_kni_request));
 137         ret = 0;
 138
 139 fail:
 140         mutex_unlock(&kni->sync_lock);
 141         return ret;
 142 }
 143
 144 /*
 145  * Open and close
 146  */
 147 static int
 148 kni_net_open(struct net_device *dev)
 149 {
 150         int ret;
 151         struct rte_kni_request req;
 152         struct kni_dev *kni = netdev_priv(dev);
 153
 154         netif_start_queue(dev);
 155
 156         memset(&req, 0, sizeof(req));
 157         req.req_id = RTE_KNI_REQ_CFG_NETWORK_IF;
 158
 159         /* Setting if_up to non-zero means up */
 160         req.if_up = 1;
 161         ret = kni_net_process_request(kni, &req);
 162
 163         return (ret == 0) ? req.result : ret;
 164 }
 165
 166 static int
 167 kni_net_release(struct net_device *dev)
 168 {
 169         int ret;
 170         struct rte_kni_request req;
 171         struct kni_dev *kni = netdev_priv(dev);
 172
 173         netif_stop_queue(dev); /* can't transmit any more */
 174
 175         memset(&req, 0, sizeof(req));
 176         req.req_id = RTE_KNI_REQ_CFG_NETWORK_IF;
 177
 178         /* Setting if_up to 0 means down */
 179         req.if_up = 0;
 180         ret = kni_net_process_request(kni, &req);
 181
 182         return (ret == 0) ? req.result : ret;
 183 }
 184
 185 /*
 186  * Configuration changes (passed on by ifconfig)
 187  */
 188 static int
 189 kni_net_config(struct net_device *dev, struct ifmap *map)
 190 {
 191         if (dev->flags & IFF_UP) /* can't act on a running interface */
 192                 return -EBUSY;
 193
 194         /* ignore other fields */
 195         return 0;
 196 }
 197
 198 /*
 199  * Transmit a packet (called by the kernel)
 200  */
 201 #ifdef RTE_KNI_VHOST
 202 static int
 203 kni_net_tx(struct sk_buff *skb, struct net_device *dev)
 204 {
 205         struct kni_dev *kni = netdev_priv(dev);
 206
 207         dev_kfree_skb(skb);
 208         kni->stats.tx_dropped++;
 209
 210         return NETDEV_TX_OK;
 211 }
 212 #else
 213 static int
 214 kni_net_tx(struct sk_buff *skb, struct net_device *dev)
 215 {
 216         int len = 0;
 217         uint32_t ret;
 218         struct kni_dev *kni = netdev_priv(dev);
 219         struct rte_kni_mbuf *pkt_kva = NULL;
 220         void *pkt_pa = NULL;
 221         void *pkt_va = NULL;
 222
 223         /* save the timestamp */
 224 #ifdef HAVE_TRANS_START_HELPER
 225         netif_trans_update(dev);
 226 #else
 227         dev->trans_start = jiffies;
 228 #endif
 229
 230         /* Check if the length of skb is less than mbuf size */
 231         if (skb->len > kni->mbuf_size)
 232                 goto drop;
 233
 234         /**
 235          * Check if it has at least one free entry in tx_q and
 236          * one entry in alloc_q.
 237          */
 238         if (kni_fifo_free_count(kni->tx_q) == 0 ||
 239                         kni_fifo_count(kni->alloc_q) == 0) {
 240                 /**
 241                  * If no free entry in tx_q or no entry in alloc_q,
 242                  * drops skb and goes out.
 243                  */
 244                 goto drop;
 245         }
 246
 247         /* dequeue a mbuf from alloc_q */
 248         ret = kni_fifo_get(kni->alloc_q, &pkt_pa, 1);
 249         if (likely(ret == 1)) {
 250                 void *data_kva;
 251
 252                 pkt_kva = pa2kva(pkt_pa);
 253                 data_kva = kva2data_kva(pkt_kva);
 254                 pkt_va = pa2va(pkt_pa, pkt_kva);
 255
 256                 len = skb->len;
 257                 memcpy(data_kva, skb->data, len);
 258                 if (unlikely(len < ETH_ZLEN)) {
 259                         memset(data_kva + len, 0, ETH_ZLEN - len);
 260                         len = ETH_ZLEN;
 261                 }
 262                 pkt_kva->pkt_len = len;
 263                 pkt_kva->data_len = len;
 264
 265                 /* enqueue mbuf into tx_q */
 266                 ret = kni_fifo_put(kni->tx_q, &pkt_va, 1);
 267                 if (unlikely(ret != 1)) {
 268                         /* Failing should not happen */
 269                         pr_err("Fail to enqueue mbuf into tx_q\n");
 270                         goto drop;
 271                 }
 272         } else {
 273                 /* Failing should not happen */
 274                 pr_err("Fail to dequeue mbuf from alloc_q\n");
 275                 goto drop;
 276         }
 277
 278         /* Free skb and update statistics */
 279         dev_kfree_skb(skb);
 280         kni->stats.tx_bytes += len;
 281         kni->stats.tx_packets++;
 282
 283         return NETDEV_TX_OK;
 284
 285 drop:
 286         /* Free skb and update statistics */
 287         dev_kfree_skb(skb);
 288         kni->stats.tx_dropped++;
 289
 290         return NETDEV_TX_OK;
 291 }
 292 #endif
 293
 294 /*
 295  * RX: normal working mode
 296  */
 297 static void
 298 kni_net_rx_normal(struct kni_dev *kni)
 299 {
 300         uint32_t ret;
 301         uint32_t len;
 302         uint32_t i, num_rx, num_fq;
 303         struct rte_kni_mbuf *kva;
 304         void *data_kva;
 305         struct sk_buff *skb;
 306         struct net_device *dev = kni->net_dev;
 307
 308         /* Get the number of free entries in free_q */
 309         num_fq = kni_fifo_free_count(kni->free_q);
 310         if (num_fq == 0) {
 311                 /* No room on the free_q, bail out */
 312                 return;
 313         }
 314
 315         /* Calculate the number of entries to dequeue from rx_q */
 316         num_rx = min_t(uint32_t, num_fq, MBUF_BURST_SZ);
 317
 318         /* Burst dequeue from rx_q */
 319         num_rx = kni_fifo_get(kni->rx_q, kni->pa, num_rx);
 320         if (num_rx == 0)
 321                 return;
 322
 323         /* Transfer received packets to netif */
 324         for (i = 0; i < num_rx; i++) {
 325                 kva = pa2kva(kni->pa[i]);
 326                 len = kva->pkt_len;
 327                 data_kva = kva2data_kva(kva);
 328                 kni->va[i] = pa2va(kni->pa[i], kva);
 329
 330                 skb = dev_alloc_skb(len + 2);
 331                 if (!skb) {
 332                         /* Update statistics */
 333                         kni->stats.rx_dropped++;
 334                         continue;
 335                 }
 336
 337                 /* Align IP on 16B boundary */
 338                 skb_reserve(skb, 2);
 339
 340                 if (kva->nb_segs == 1) {
 341                         memcpy(skb_put(skb, len), data_kva, len);
 342                 } else {
 343                         int nb_segs;
 344                         int kva_nb_segs = kva->nb_segs;
 345
 346                         for (nb_segs = 0; nb_segs < kva_nb_segs; nb_segs++) {
 347                                 memcpy(skb_put(skb, kva->data_len),
 348                                         data_kva, kva->data_len);
 349
 350                                 if (!kva->next)
 351                                         break;
 352
 353                                 kva = pa2kva(va2pa(kva->next, kva));
 354                                 data_kva = kva2data_kva(kva);
 355                         }
 356                 }
 357
 358                 skb->dev = dev;
 359                 skb->protocol = eth_type_trans(skb, dev);
 360                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 361
 362                 /* Call netif interface */
 363                 netif_rx_ni(skb);
 364
 365                 /* Update statistics */
 366                 kni->stats.rx_bytes += len;
 367                 kni->stats.rx_packets++;
 368         }
 369
 370         /* Burst enqueue mbufs into free_q */
 371         ret = kni_fifo_put(kni->free_q, kni->va, num_rx);
 372         if (ret != num_rx)
 373                 /* Failing should not happen */
 374                 pr_err("Fail to enqueue entries into free_q\n");
 375 }
 376
 377 /*
 378  * RX: loopback with enqueue/dequeue fifos.
 379  */
 380 static void
 381 kni_net_rx_lo_fifo(struct kni_dev *kni)
 382 {
 383         uint32_t ret;
 384         uint32_t len;
 385         uint32_t i, num, num_rq, num_tq, num_aq, num_fq;
 386         struct rte_kni_mbuf *kva;
 387         void *data_kva;
 388         struct rte_kni_mbuf *alloc_kva;
 389         void *alloc_data_kva;
 390
 391         /* Get the number of entries in rx_q */
 392         num_rq = kni_fifo_count(kni->rx_q);
 393
 394         /* Get the number of free entrie in tx_q */
 395         num_tq = kni_fifo_free_count(kni->tx_q);
 396
 397         /* Get the number of entries in alloc_q */
 398         num_aq = kni_fifo_count(kni->alloc_q);
 399
 400         /* Get the number of free entries in free_q */
 401         num_fq = kni_fifo_free_count(kni->free_q);
 402
 403         /* Calculate the number of entries to be dequeued from rx_q */
 404         num = min(num_rq, num_tq);
 405         num = min(num, num_aq);
 406         num = min(num, num_fq);
 407         num = min_t(uint32_t, num, MBUF_BURST_SZ);
 408
 409         /* Return if no entry to dequeue from rx_q */
 410         if (num == 0)
 411                 return;
 412
 413         /* Burst dequeue from rx_q */
 414         ret = kni_fifo_get(kni->rx_q, kni->pa, num);
 415         if (ret == 0)
 416                 return; /* Failing should not happen */
 417
 418         /* Dequeue entries from alloc_q */
 419         ret = kni_fifo_get(kni->alloc_q, kni->alloc_pa, num);
 420         if (ret) {
 421                 num = ret;
 422                 /* Copy mbufs */
 423                 for (i = 0; i < num; i++) {
 424                         kva = pa2kva(kni->pa[i]);
 425                         len = kva->pkt_len;
 426                         data_kva = kva2data_kva(kva);
 427                         kni->va[i] = pa2va(kni->pa[i], kva);
 428
 429                         alloc_kva = pa2kva(kni->alloc_pa[i]);
 430                         alloc_data_kva = kva2data_kva(alloc_kva);
 431                         kni->alloc_va[i] = pa2va(kni->alloc_pa[i], alloc_kva);
 432
 433                         memcpy(alloc_data_kva, data_kva, len);
 434                         alloc_kva->pkt_len = len;
 435                         alloc_kva->data_len = len;
 436
 437                         kni->stats.tx_bytes += len;
 438                         kni->stats.rx_bytes += len;
 439                 }
 440
 441                 /* Burst enqueue mbufs into tx_q */
 442                 ret = kni_fifo_put(kni->tx_q, kni->alloc_va, num);
 443                 if (ret != num)
 444                         /* Failing should not happen */
 445                         pr_err("Fail to enqueue mbufs into tx_q\n");
 446         }
 447
 448         /* Burst enqueue mbufs into free_q */
 449         ret = kni_fifo_put(kni->free_q, kni->va, num);
 450         if (ret != num)
 451                 /* Failing should not happen */
 452                 pr_err("Fail to enqueue mbufs into free_q\n");
 453
 454         /**
 455          * Update statistic, and enqueue/dequeue failure is impossible,
 456          * as all queues are checked at first.
 457          */
 458         kni->stats.tx_packets += num;
 459         kni->stats.rx_packets += num;
 460 }
 461
 462 /*
 463  * RX: loopback with enqueue/dequeue fifos and sk buffer copies.
 464  */
 465 static void
 466 kni_net_rx_lo_fifo_skb(struct kni_dev *kni)
 467 {
 468         uint32_t ret;
 469         uint32_t len;
 470         uint32_t i, num_rq, num_fq, num;
 471         struct rte_kni_mbuf *kva;
 472         void *data_kva;
 473         struct sk_buff *skb;
 474         struct net_device *dev = kni->net_dev;
 475
 476         /* Get the number of entries in rx_q */
 477         num_rq = kni_fifo_count(kni->rx_q);
 478
 479         /* Get the number of free entries in free_q */
 480         num_fq = kni_fifo_free_count(kni->free_q);
 481
 482         /* Calculate the number of entries to dequeue from rx_q */
 483         num = min(num_rq, num_fq);
 484         num = min_t(uint32_t, num, MBUF_BURST_SZ);
 485
 486         /* Return if no entry to dequeue from rx_q */
 487         if (num == 0)
 488                 return;
 489
 490         /* Burst dequeue mbufs from rx_q */
 491         ret = kni_fifo_get(kni->rx_q, kni->pa, num);
 492         if (ret == 0)
 493                 return;
 494
 495         /* Copy mbufs to sk buffer and then call tx interface */
 496         for (i = 0; i < num; i++) {
 497                 kva = pa2kva(kni->pa[i]);
 498                 len = kva->pkt_len;
 499                 data_kva = kva2data_kva(kva);
 500                 kni->va[i] = pa2va(kni->pa[i], kva);
 501
 502                 skb = dev_alloc_skb(len + 2);
 503                 if (skb) {
 504                         /* Align IP on 16B boundary */
 505                         skb_reserve(skb, 2);
 506                         memcpy(skb_put(skb, len), data_kva, len);
 507                         skb->dev = dev;
 508                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 509                         dev_kfree_skb(skb);
 510                 }
 511
 512                 /* Simulate real usage, allocate/copy skb twice */
 513                 skb = dev_alloc_skb(len + 2);
 514                 if (skb == NULL) {
 515                         kni->stats.rx_dropped++;
 516                         continue;
 517                 }
 518
 519                 /* Align IP on 16B boundary */
 520                 skb_reserve(skb, 2);
 521
 522                 if (kva->nb_segs == 1) {
 523                         memcpy(skb_put(skb, len), data_kva, len);
 524                 } else {
 525                         int nb_segs;
 526                         int kva_nb_segs = kva->nb_segs;
 527
 528                         for (nb_segs = 0; nb_segs < kva_nb_segs; nb_segs++) {
 529                                 memcpy(skb_put(skb, kva->data_len),
 530                                         data_kva, kva->data_len);
 531
 532                                 if (!kva->next)
 533                                         break;
 534
 535                                 kva = pa2kva(va2pa(kva->next, kva));
 536                                 data_kva = kva2data_kva(kva);
 537                         }
 538                 }
 539
 540                 skb->dev = dev;
 541                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 542
 543                 kni->stats.rx_bytes += len;
 544                 kni->stats.rx_packets++;
 545
 546                 /* call tx interface */
 547                 kni_net_tx(skb, dev);
 548         }
 549
 550         /* enqueue all the mbufs from rx_q into free_q */
 551         ret = kni_fifo_put(kni->free_q, kni->va, num);
 552         if (ret != num)
 553                 /* Failing should not happen */
 554                 pr_err("Fail to enqueue mbufs into free_q\n");
 555 }
 556
 557 /* rx interface */
 558 void
 559 kni_net_rx(struct kni_dev *kni)
 560 {
 561         /**
 562          * It doesn't need to check if it is NULL pointer,
 563          * as it has a default value
 564          */
 565         (*kni_net_rx_func)(kni);
 566 }
 567
 568 /*
 569  * Deal with a transmit timeout.
 570  */
 571 static void
 572 kni_net_tx_timeout(struct net_device *dev)
 573 {
 574         struct kni_dev *kni = netdev_priv(dev);
 575
 576         pr_debug("Transmit timeout at %ld, latency %ld\n", jiffies,
 577                         jiffies - dev_trans_start(dev));
 578
 579         kni->stats.tx_errors++;
 580         netif_wake_queue(dev);
 581 }
 582
 583 /*
 584  * Ioctl commands
 585  */
 586 static int
 587 kni_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 588 {
 589         pr_debug("kni_net_ioctl group:%d cmd:%d\n",
 590                 ((struct kni_dev *)netdev_priv(dev))->group_id, cmd);
 591
 592         return 0;
 593 }
 594
 595 static void
 596 kni_net_set_rx_mode(struct net_device *dev)
 597 {
 598 }
 599
 600 static int
 601 kni_net_change_mtu(struct net_device *dev, int new_mtu)
 602 {
 603         int ret;
 604         struct rte_kni_request req;
 605         struct kni_dev *kni = netdev_priv(dev);
 606
 607         pr_debug("kni_net_change_mtu new mtu %d to be set\n", new_mtu);
 608
 609         memset(&req, 0, sizeof(req));
 610         req.req_id = RTE_KNI_REQ_CHANGE_MTU;
 611         req.new_mtu = new_mtu;
 612         ret = kni_net_process_request(kni, &req);
 613         if (ret == 0 && req.result == 0)
 614                 dev->mtu = new_mtu;
 615
 616         return (ret == 0) ? req.result : ret;
 617 }
 618
 619 /*
 620  * Checks if the user space application provided the resp message
 621  */
 622 void
 623 kni_net_poll_resp(struct kni_dev *kni)
 624 {
 625         if (kni_fifo_count(kni->resp_q))
 626                 wake_up_interruptible(&kni->wq);
 627 }
 628
 629 /*
 630  * Return statistics to the caller
 631  */
 632 static struct net_device_stats *
 633 kni_net_stats(struct net_device *dev)
 634 {
 635         struct kni_dev *kni = netdev_priv(dev);
 636
 637         return &kni->stats;
 638 }
 639
 640 /*
 641  *  Fill the eth header
 642  */
 643 static int
 644 kni_net_header(struct sk_buff *skb, struct net_device *dev,
 645                 unsigned short type, const void *daddr,
 646                 const void *saddr, uint32_t len)
 647 {
 648         struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
 649
 650         memcpy(eth->h_source, saddr ? saddr : dev->dev_addr, dev->addr_len);
 651         memcpy(eth->h_dest,   daddr ? daddr : dev->dev_addr, dev->addr_len);
 652         eth->h_proto = htons(type);
 653
 654         return dev->hard_header_len;
 655 }
 656
 657 /*
 658  * Re-fill the eth header
 659  */
 660 #ifdef HAVE_REBUILD_HEADER
 661 static int
 662 kni_net_rebuild_header(struct sk_buff *skb)
 663 {
 664         struct net_device *dev = skb->dev;
 665         struct ethhdr *eth = (struct ethhdr *) skb->data;
 666
 667         memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
 668         memcpy(eth->h_dest, dev->dev_addr, dev->addr_len);
 669
 670         return 0;
 671 }
 672 #endif /* < 4.1.0  */
 673
 674 /**
 675  * kni_net_set_mac - Change the Ethernet Address of the KNI NIC
 676  * @netdev: network interface device structure
 677  * @p: pointer to an address structure
 678  *
 679  * Returns 0 on success, negative on failure
 680  **/
 681 static int
 682 kni_net_set_mac(struct net_device *netdev, void *p)
 683 {
 684         struct sockaddr *addr = p;
 685
 686         if (!is_valid_ether_addr((unsigned char *)(addr->sa_data)))
 687                 return -EADDRNOTAVAIL;
 688         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 689         return 0;
 690 }
 691
 692 #ifdef HAVE_CHANGE_CARRIER_CB
 693 static int
 694 kni_net_change_carrier(struct net_device *dev, bool new_carrier)
 695 {
 696         if (new_carrier)
 697                 netif_carrier_on(dev);
 698         else
 699                 netif_carrier_off(dev);
 700         return 0;
 701 }
 702 #endif
 703
 704 static const struct header_ops kni_net_header_ops = {
 705         .create  = kni_net_header,
 706 #ifdef HAVE_REBUILD_HEADER
 707         .rebuild = kni_net_rebuild_header,
 708 #endif /* < 4.1.0  */
 709         .cache   = NULL,  /* disable caching */
 710 };
 711
 712 static const struct net_device_ops kni_net_netdev_ops = {
 713         .ndo_open = kni_net_open,
 714         .ndo_stop = kni_net_release,
 715         .ndo_set_config = kni_net_config,
 716         .ndo_start_xmit = kni_net_tx,
 717         .ndo_change_mtu = kni_net_change_mtu,
 718         .ndo_do_ioctl = kni_net_ioctl,
 719         .ndo_set_rx_mode = kni_net_set_rx_mode,
 720         .ndo_get_stats = kni_net_stats,
 721         .ndo_tx_timeout = kni_net_tx_timeout,
 722         .ndo_set_mac_address = kni_net_set_mac,
 723 #ifdef HAVE_CHANGE_CARRIER_CB
 724         .ndo_change_carrier = kni_net_change_carrier,
 725 #endif
 726 };
 727
 728 void
 729 kni_net_init(struct net_device *dev)
 730 {
 731         struct kni_dev *kni = netdev_priv(dev);
 732
 733         init_waitqueue_head(&kni->wq);
 734         mutex_init(&kni->sync_lock);
 735
 736         ether_setup(dev); /* assign some of the fields */
 737         dev->netdev_ops      = &kni_net_netdev_ops;
 738         dev->header_ops      = &kni_net_header_ops;
 739         dev->watchdog_timeo = WD_TIMEOUT;
 740 }
 741
 742 void
 743 kni_net_config_lo_mode(char *lo_str)
 744 {
 745         if (!lo_str) {
 746                 pr_debug("loopback disabled");
 747                 return;
 748         }
 749
 750         if (!strcmp(lo_str, "lo_mode_none"))
 751                 pr_debug("loopback disabled");
 752         else if (!strcmp(lo_str, "lo_mode_fifo")) {
 753                 pr_debug("loopback mode=lo_mode_fifo enabled");
 754                 kni_net_rx_func = kni_net_rx_lo_fifo;
 755         } else if (!strcmp(lo_str, "lo_mode_fifo_skb")) {
 756                 pr_debug("loopback mode=lo_mode_fifo_skb enabled");
 757                 kni_net_rx_func = kni_net_rx_lo_fifo_skb;
 758         } else
 759                 pr_debug("Incognizant parameter, loopback disabled");
 760 }