ceph/src/spdk/dpdk/kernel/linux/kni/kni_net.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright(c) 2010-2014 Intel Corporation.
   4  */
   5
   6 /*
   7  * This code is inspired from the book "Linux Device Drivers" by
   8  * Alessandro Rubini and Jonathan Corbet, published by O'Reilly & Associates
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/module.h>
  13 #include <linux/version.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/etherdevice.h> /* eth_type_trans */
  16 #include <linux/skbuff.h>
  17 #include <linux/kthread.h>
  18 #include <linux/delay.h>
  19
  20 #include <rte_kni_common.h>
  21 #include <kni_fifo.h>
  22
  23 #include "compat.h"
  24 #include "kni_dev.h"
  25
  26 #define WD_TIMEOUT 5 /*jiffies */
  27
  28 #define KNI_WAIT_RESPONSE_TIMEOUT 300 /* 3 seconds */
  29
  30 /* typedef for rx function */
  31 typedef void (*kni_net_rx_t)(struct kni_dev *kni);
  32
  33 static void kni_net_rx_normal(struct kni_dev *kni);
  34
  35 /* kni rx function pointer, with default to normal rx */
  36 static kni_net_rx_t kni_net_rx_func = kni_net_rx_normal;
  37
  38 /* physical address to kernel virtual address */
  39 static void *
  40 pa2kva(void *pa)
  41 {
  42         return phys_to_virt((unsigned long)pa);
  43 }
  44
  45 /* physical address to virtual address */
  46 static void *
  47 pa2va(void *pa, struct rte_kni_mbuf *m)
  48 {
  49         void *va;
  50
  51         va = (void *)((unsigned long)pa +
  52                         (unsigned long)m->buf_addr -
  53                         (unsigned long)m->buf_physaddr);
  54         return va;
  55 }
  56
  57 /* mbuf data kernel virtual address from mbuf kernel virtual address */
  58 static void *
  59 kva2data_kva(struct rte_kni_mbuf *m)
  60 {
  61         return phys_to_virt(m->buf_physaddr + m->data_off);
  62 }
  63
  64 /* virtual address to physical address */
  65 static void *
  66 va2pa(void *va, struct rte_kni_mbuf *m)
  67 {
  68         void *pa;
  69
  70         pa = (void *)((unsigned long)va -
  71                         ((unsigned long)m->buf_addr -
  72                          (unsigned long)m->buf_physaddr));
  73         return pa;
  74 }
  75
  76 /*
  77  * It can be called to process the request.
  78  */
  79 static int
  80 kni_net_process_request(struct kni_dev *kni, struct rte_kni_request *req)
  81 {
  82         int ret = -1;
  83         void *resp_va;
  84         uint32_t num;
  85         int ret_val;
  86
  87         if (!kni || !req) {
  88                 pr_err("No kni instance or request\n");
  89                 return -EINVAL;
  90         }
  91
  92         mutex_lock(&kni->sync_lock);
  93
  94         /* Construct data */
  95         memcpy(kni->sync_kva, req, sizeof(struct rte_kni_request));
  96         num = kni_fifo_put(kni->req_q, &kni->sync_va, 1);
  97         if (num < 1) {
  98                 pr_err("Cannot send to req_q\n");
  99                 ret = -EBUSY;
 100                 goto fail;
 101         }
 102
 103         ret_val = wait_event_interruptible_timeout(kni->wq,
 104                         kni_fifo_count(kni->resp_q), 3 * HZ);
 105         if (signal_pending(current) || ret_val <= 0) {
 106                 ret = -ETIME;
 107                 goto fail;
 108         }
 109         num = kni_fifo_get(kni->resp_q, (void **)&resp_va, 1);
 110         if (num != 1 || resp_va != kni->sync_va) {
 111                 /* This should never happen */
 112                 pr_err("No data in resp_q\n");
 113                 ret = -ENODATA;
 114                 goto fail;
 115         }
 116
 117         memcpy(req, kni->sync_kva, sizeof(struct rte_kni_request));
 118         ret = 0;
 119
 120 fail:
 121         mutex_unlock(&kni->sync_lock);
 122         return ret;
 123 }
 124
 125 /*
 126  * Open and close
 127  */
 128 static int
 129 kni_net_open(struct net_device *dev)
 130 {
 131         int ret;
 132         struct rte_kni_request req;
 133         struct kni_dev *kni = netdev_priv(dev);
 134
 135         netif_start_queue(dev);
 136         if (dflt_carrier == 1)
 137                 netif_carrier_on(dev);
 138         else
 139                 netif_carrier_off(dev);
 140
 141         memset(&req, 0, sizeof(req));
 142         req.req_id = RTE_KNI_REQ_CFG_NETWORK_IF;
 143
 144         /* Setting if_up to non-zero means up */
 145         req.if_up = 1;
 146         ret = kni_net_process_request(kni, &req);
 147
 148         return (ret == 0) ? req.result : ret;
 149 }
 150
 151 static int
 152 kni_net_release(struct net_device *dev)
 153 {
 154         int ret;
 155         struct rte_kni_request req;
 156         struct kni_dev *kni = netdev_priv(dev);
 157
 158         netif_stop_queue(dev); /* can't transmit any more */
 159         netif_carrier_off(dev);
 160
 161         memset(&req, 0, sizeof(req));
 162         req.req_id = RTE_KNI_REQ_CFG_NETWORK_IF;
 163
 164         /* Setting if_up to 0 means down */
 165         req.if_up = 0;
 166         ret = kni_net_process_request(kni, &req);
 167
 168         return (ret == 0) ? req.result : ret;
 169 }
 170
 171 static void
 172 kni_fifo_trans_pa2va(struct kni_dev *kni,
 173         struct rte_kni_fifo *src_pa, struct rte_kni_fifo *dst_va)
 174 {
 175         uint32_t ret, i, num_dst, num_rx;
 176         void *kva;
 177         do {
 178                 num_dst = kni_fifo_free_count(dst_va);
 179                 if (num_dst == 0)
 180                         return;
 181
 182                 num_rx = min_t(uint32_t, num_dst, MBUF_BURST_SZ);
 183
 184                 num_rx = kni_fifo_get(src_pa, kni->pa, num_rx);
 185                 if (num_rx == 0)
 186                         return;
 187
 188                 for (i = 0; i < num_rx; i++) {
 189                         kva = pa2kva(kni->pa[i]);
 190                         kni->va[i] = pa2va(kni->pa[i], kva);
 191                 }
 192
 193                 ret = kni_fifo_put(dst_va, kni->va, num_rx);
 194                 if (ret != num_rx) {
 195                         /* Failing should not happen */
 196                         pr_err("Fail to enqueue entries into dst_va\n");
 197                         return;
 198                 }
 199         } while (1);
 200 }
 201
 202 /* Try to release mbufs when kni release */
 203 void kni_net_release_fifo_phy(struct kni_dev *kni)
 204 {
 205         /* release rx_q first, because it can't release in userspace */
 206         kni_fifo_trans_pa2va(kni, kni->rx_q, kni->free_q);
 207         /* release alloc_q for speeding up kni release in userspace */
 208         kni_fifo_trans_pa2va(kni, kni->alloc_q, kni->free_q);
 209 }
 210
 211 /*
 212  * Configuration changes (passed on by ifconfig)
 213  */
 214 static int
 215 kni_net_config(struct net_device *dev, struct ifmap *map)
 216 {
 217         if (dev->flags & IFF_UP) /* can't act on a running interface */
 218                 return -EBUSY;
 219
 220         /* ignore other fields */
 221         return 0;
 222 }
 223
 224 /*
 225  * Transmit a packet (called by the kernel)
 226  */
 227 static int
 228 kni_net_tx(struct sk_buff *skb, struct net_device *dev)
 229 {
 230         int len = 0;
 231         uint32_t ret;
 232         struct kni_dev *kni = netdev_priv(dev);
 233         struct rte_kni_mbuf *pkt_kva = NULL;
 234         void *pkt_pa = NULL;
 235         void *pkt_va = NULL;
 236
 237         /* save the timestamp */
 238 #ifdef HAVE_TRANS_START_HELPER
 239         netif_trans_update(dev);
 240 #else
 241         dev->trans_start = jiffies;
 242 #endif
 243
 244         /* Check if the length of skb is less than mbuf size */
 245         if (skb->len > kni->mbuf_size)
 246                 goto drop;
 247
 248         /**
 249          * Check if it has at least one free entry in tx_q and
 250          * one entry in alloc_q.
 251          */
 252         if (kni_fifo_free_count(kni->tx_q) == 0 ||
 253                         kni_fifo_count(kni->alloc_q) == 0) {
 254                 /**
 255                  * If no free entry in tx_q or no entry in alloc_q,
 256                  * drops skb and goes out.
 257                  */
 258                 goto drop;
 259         }
 260
 261         /* dequeue a mbuf from alloc_q */
 262         ret = kni_fifo_get(kni->alloc_q, &pkt_pa, 1);
 263         if (likely(ret == 1)) {
 264                 void *data_kva;
 265
 266                 pkt_kva = pa2kva(pkt_pa);
 267                 data_kva = kva2data_kva(pkt_kva);
 268                 pkt_va = pa2va(pkt_pa, pkt_kva);
 269
 270                 len = skb->len;
 271                 memcpy(data_kva, skb->data, len);
 272                 if (unlikely(len < ETH_ZLEN)) {
 273                         memset(data_kva + len, 0, ETH_ZLEN - len);
 274                         len = ETH_ZLEN;
 275                 }
 276                 pkt_kva->pkt_len = len;
 277                 pkt_kva->data_len = len;
 278
 279                 /* enqueue mbuf into tx_q */
 280                 ret = kni_fifo_put(kni->tx_q, &pkt_va, 1);
 281                 if (unlikely(ret != 1)) {
 282                         /* Failing should not happen */
 283                         pr_err("Fail to enqueue mbuf into tx_q\n");
 284                         goto drop;
 285                 }
 286         } else {
 287                 /* Failing should not happen */
 288                 pr_err("Fail to dequeue mbuf from alloc_q\n");
 289                 goto drop;
 290         }
 291
 292         /* Free skb and update statistics */
 293         dev_kfree_skb(skb);
 294         kni->stats.tx_bytes += len;
 295         kni->stats.tx_packets++;
 296
 297         return NETDEV_TX_OK;
 298
 299 drop:
 300         /* Free skb and update statistics */
 301         dev_kfree_skb(skb);
 302         kni->stats.tx_dropped++;
 303
 304         return NETDEV_TX_OK;
 305 }
 306
 307 /*
 308  * RX: normal working mode
 309  */
 310 static void
 311 kni_net_rx_normal(struct kni_dev *kni)
 312 {
 313         uint32_t ret;
 314         uint32_t len;
 315         uint32_t i, num_rx, num_fq;
 316         struct rte_kni_mbuf *kva;
 317         void *data_kva;
 318         struct sk_buff *skb;
 319         struct net_device *dev = kni->net_dev;
 320
 321         /* Get the number of free entries in free_q */
 322         num_fq = kni_fifo_free_count(kni->free_q);
 323         if (num_fq == 0) {
 324                 /* No room on the free_q, bail out */
 325                 return;
 326         }
 327
 328         /* Calculate the number of entries to dequeue from rx_q */
 329         num_rx = min_t(uint32_t, num_fq, MBUF_BURST_SZ);
 330
 331         /* Burst dequeue from rx_q */
 332         num_rx = kni_fifo_get(kni->rx_q, kni->pa, num_rx);
 333         if (num_rx == 0)
 334                 return;
 335
 336         /* Transfer received packets to netif */
 337         for (i = 0; i < num_rx; i++) {
 338                 kva = pa2kva(kni->pa[i]);
 339                 len = kva->pkt_len;
 340                 data_kva = kva2data_kva(kva);
 341                 kni->va[i] = pa2va(kni->pa[i], kva);
 342
 343                 skb = dev_alloc_skb(len + 2);
 344                 if (!skb) {
 345                         /* Update statistics */
 346                         kni->stats.rx_dropped++;
 347                         continue;
 348                 }
 349
 350                 /* Align IP on 16B boundary */
 351                 skb_reserve(skb, 2);
 352
 353                 if (kva->nb_segs == 1) {
 354                         memcpy(skb_put(skb, len), data_kva, len);
 355                 } else {
 356                         int nb_segs;
 357                         int kva_nb_segs = kva->nb_segs;
 358
 359                         for (nb_segs = 0; nb_segs < kva_nb_segs; nb_segs++) {
 360                                 memcpy(skb_put(skb, kva->data_len),
 361                                         data_kva, kva->data_len);
 362
 363                                 if (!kva->next)
 364                                         break;
 365
 366                                 kva = pa2kva(va2pa(kva->next, kva));
 367                                 data_kva = kva2data_kva(kva);
 368                         }
 369                 }
 370
 371                 skb->dev = dev;
 372                 skb->protocol = eth_type_trans(skb, dev);
 373                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 374
 375                 /* Call netif interface */
 376                 netif_rx_ni(skb);
 377
 378                 /* Update statistics */
 379                 kni->stats.rx_bytes += len;
 380                 kni->stats.rx_packets++;
 381         }
 382
 383         /* Burst enqueue mbufs into free_q */
 384         ret = kni_fifo_put(kni->free_q, kni->va, num_rx);
 385         if (ret != num_rx)
 386                 /* Failing should not happen */
 387                 pr_err("Fail to enqueue entries into free_q\n");
 388 }
 389
 390 /*
 391  * RX: loopback with enqueue/dequeue fifos.
 392  */
 393 static void
 394 kni_net_rx_lo_fifo(struct kni_dev *kni)
 395 {
 396         uint32_t ret;
 397         uint32_t len;
 398         uint32_t i, num, num_rq, num_tq, num_aq, num_fq;
 399         struct rte_kni_mbuf *kva;
 400         void *data_kva;
 401         struct rte_kni_mbuf *alloc_kva;
 402         void *alloc_data_kva;
 403
 404         /* Get the number of entries in rx_q */
 405         num_rq = kni_fifo_count(kni->rx_q);
 406
 407         /* Get the number of free entrie in tx_q */
 408         num_tq = kni_fifo_free_count(kni->tx_q);
 409
 410         /* Get the number of entries in alloc_q */
 411         num_aq = kni_fifo_count(kni->alloc_q);
 412
 413         /* Get the number of free entries in free_q */
 414         num_fq = kni_fifo_free_count(kni->free_q);
 415
 416         /* Calculate the number of entries to be dequeued from rx_q */
 417         num = min(num_rq, num_tq);
 418         num = min(num, num_aq);
 419         num = min(num, num_fq);
 420         num = min_t(uint32_t, num, MBUF_BURST_SZ);
 421
 422         /* Return if no entry to dequeue from rx_q */
 423         if (num == 0)
 424                 return;
 425
 426         /* Burst dequeue from rx_q */
 427         ret = kni_fifo_get(kni->rx_q, kni->pa, num);
 428         if (ret == 0)
 429                 return; /* Failing should not happen */
 430
 431         /* Dequeue entries from alloc_q */
 432         ret = kni_fifo_get(kni->alloc_q, kni->alloc_pa, num);
 433         if (ret) {
 434                 num = ret;
 435                 /* Copy mbufs */
 436                 for (i = 0; i < num; i++) {
 437                         kva = pa2kva(kni->pa[i]);
 438                         len = kva->pkt_len;
 439                         data_kva = kva2data_kva(kva);
 440                         kni->va[i] = pa2va(kni->pa[i], kva);
 441
 442                         alloc_kva = pa2kva(kni->alloc_pa[i]);
 443                         alloc_data_kva = kva2data_kva(alloc_kva);
 444                         kni->alloc_va[i] = pa2va(kni->alloc_pa[i], alloc_kva);
 445
 446                         memcpy(alloc_data_kva, data_kva, len);
 447                         alloc_kva->pkt_len = len;
 448                         alloc_kva->data_len = len;
 449
 450                         kni->stats.tx_bytes += len;
 451                         kni->stats.rx_bytes += len;
 452                 }
 453
 454                 /* Burst enqueue mbufs into tx_q */
 455                 ret = kni_fifo_put(kni->tx_q, kni->alloc_va, num);
 456                 if (ret != num)
 457                         /* Failing should not happen */
 458                         pr_err("Fail to enqueue mbufs into tx_q\n");
 459         }
 460
 461         /* Burst enqueue mbufs into free_q */
 462         ret = kni_fifo_put(kni->free_q, kni->va, num);
 463         if (ret != num)
 464                 /* Failing should not happen */
 465                 pr_err("Fail to enqueue mbufs into free_q\n");
 466
 467         /**
 468          * Update statistic, and enqueue/dequeue failure is impossible,
 469          * as all queues are checked at first.
 470          */
 471         kni->stats.tx_packets += num;
 472         kni->stats.rx_packets += num;
 473 }
 474
 475 /*
 476  * RX: loopback with enqueue/dequeue fifos and sk buffer copies.
 477  */
 478 static void
 479 kni_net_rx_lo_fifo_skb(struct kni_dev *kni)
 480 {
 481         uint32_t ret;
 482         uint32_t len;
 483         uint32_t i, num_rq, num_fq, num;
 484         struct rte_kni_mbuf *kva;
 485         void *data_kva;
 486         struct sk_buff *skb;
 487         struct net_device *dev = kni->net_dev;
 488
 489         /* Get the number of entries in rx_q */
 490         num_rq = kni_fifo_count(kni->rx_q);
 491
 492         /* Get the number of free entries in free_q */
 493         num_fq = kni_fifo_free_count(kni->free_q);
 494
 495         /* Calculate the number of entries to dequeue from rx_q */
 496         num = min(num_rq, num_fq);
 497         num = min_t(uint32_t, num, MBUF_BURST_SZ);
 498
 499         /* Return if no entry to dequeue from rx_q */
 500         if (num == 0)
 501                 return;
 502
 503         /* Burst dequeue mbufs from rx_q */
 504         ret = kni_fifo_get(kni->rx_q, kni->pa, num);
 505         if (ret == 0)
 506                 return;
 507
 508         /* Copy mbufs to sk buffer and then call tx interface */
 509         for (i = 0; i < num; i++) {
 510                 kva = pa2kva(kni->pa[i]);
 511                 len = kva->pkt_len;
 512                 data_kva = kva2data_kva(kva);
 513                 kni->va[i] = pa2va(kni->pa[i], kva);
 514
 515                 skb = dev_alloc_skb(len + 2);
 516                 if (skb) {
 517                         /* Align IP on 16B boundary */
 518                         skb_reserve(skb, 2);
 519                         memcpy(skb_put(skb, len), data_kva, len);
 520                         skb->dev = dev;
 521                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 522                         dev_kfree_skb(skb);
 523                 }
 524
 525                 /* Simulate real usage, allocate/copy skb twice */
 526                 skb = dev_alloc_skb(len + 2);
 527                 if (skb == NULL) {
 528                         kni->stats.rx_dropped++;
 529                         continue;
 530                 }
 531
 532                 /* Align IP on 16B boundary */
 533                 skb_reserve(skb, 2);
 534
 535                 if (kva->nb_segs == 1) {
 536                         memcpy(skb_put(skb, len), data_kva, len);
 537                 } else {
 538                         int nb_segs;
 539                         int kva_nb_segs = kva->nb_segs;
 540
 541                         for (nb_segs = 0; nb_segs < kva_nb_segs; nb_segs++) {
 542                                 memcpy(skb_put(skb, kva->data_len),
 543                                         data_kva, kva->data_len);
 544
 545                                 if (!kva->next)
 546                                         break;
 547
 548                                 kva = pa2kva(va2pa(kva->next, kva));
 549                                 data_kva = kva2data_kva(kva);
 550                         }
 551                 }
 552
 553                 skb->dev = dev;
 554                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 555
 556                 kni->stats.rx_bytes += len;
 557                 kni->stats.rx_packets++;
 558
 559                 /* call tx interface */
 560                 kni_net_tx(skb, dev);
 561         }
 562
 563         /* enqueue all the mbufs from rx_q into free_q */
 564         ret = kni_fifo_put(kni->free_q, kni->va, num);
 565         if (ret != num)
 566                 /* Failing should not happen */
 567                 pr_err("Fail to enqueue mbufs into free_q\n");
 568 }
 569
 570 /* rx interface */
 571 void
 572 kni_net_rx(struct kni_dev *kni)
 573 {
 574         /**
 575          * It doesn't need to check if it is NULL pointer,
 576          * as it has a default value
 577          */
 578         (*kni_net_rx_func)(kni);
 579 }
 580
 581 /*
 582  * Deal with a transmit timeout.
 583  */
 584 static void
 585 kni_net_tx_timeout(struct net_device *dev)
 586 {
 587         struct kni_dev *kni = netdev_priv(dev);
 588
 589         pr_debug("Transmit timeout at %ld, latency %ld\n", jiffies,
 590                         jiffies - dev_trans_start(dev));
 591
 592         kni->stats.tx_errors++;
 593         netif_wake_queue(dev);
 594 }
 595
 596 /*
 597  * Ioctl commands
 598  */
 599 static int
 600 kni_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 601 {
 602         pr_debug("kni_net_ioctl group:%d cmd:%d\n",
 603                 ((struct kni_dev *)netdev_priv(dev))->group_id, cmd);
 604
 605         return -EOPNOTSUPP;
 606 }
 607
 608 static void
 609 kni_net_set_rx_mode(struct net_device *dev)
 610 {
 611 }
 612
 613 static int
 614 kni_net_change_mtu(struct net_device *dev, int new_mtu)
 615 {
 616         int ret;
 617         struct rte_kni_request req;
 618         struct kni_dev *kni = netdev_priv(dev);
 619
 620         pr_debug("kni_net_change_mtu new mtu %d to be set\n", new_mtu);
 621
 622         memset(&req, 0, sizeof(req));
 623         req.req_id = RTE_KNI_REQ_CHANGE_MTU;
 624         req.new_mtu = new_mtu;
 625         ret = kni_net_process_request(kni, &req);
 626         if (ret == 0 && req.result == 0)
 627                 dev->mtu = new_mtu;
 628
 629         return (ret == 0) ? req.result : ret;
 630 }
 631
 632 static void
 633 kni_net_set_promiscusity(struct net_device *netdev, int flags)
 634 {
 635         struct rte_kni_request req;
 636         struct kni_dev *kni = netdev_priv(netdev);
 637
 638         memset(&req, 0, sizeof(req));
 639         req.req_id = RTE_KNI_REQ_CHANGE_PROMISC;
 640
 641         if (netdev->flags & IFF_PROMISC)
 642                 req.promiscusity = 1;
 643         else
 644                 req.promiscusity = 0;
 645         kni_net_process_request(kni, &req);
 646 }
 647
 648 /*
 649  * Checks if the user space application provided the resp message
 650  */
 651 void
 652 kni_net_poll_resp(struct kni_dev *kni)
 653 {
 654         if (kni_fifo_count(kni->resp_q))
 655                 wake_up_interruptible(&kni->wq);
 656 }
 657
 658 /*
 659  * Return statistics to the caller
 660  */
 661 static struct net_device_stats *
 662 kni_net_stats(struct net_device *dev)
 663 {
 664         struct kni_dev *kni = netdev_priv(dev);
 665
 666         return &kni->stats;
 667 }
 668
 669 /*
 670  *  Fill the eth header
 671  */
 672 static int
 673 kni_net_header(struct sk_buff *skb, struct net_device *dev,
 674                 unsigned short type, const void *daddr,
 675                 const void *saddr, uint32_t len)
 676 {
 677         struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
 678
 679         memcpy(eth->h_source, saddr ? saddr : dev->dev_addr, dev->addr_len);
 680         memcpy(eth->h_dest,   daddr ? daddr : dev->dev_addr, dev->addr_len);
 681         eth->h_proto = htons(type);
 682
 683         return dev->hard_header_len;
 684 }
 685
 686 /*
 687  * Re-fill the eth header
 688  */
 689 #ifdef HAVE_REBUILD_HEADER
 690 static int
 691 kni_net_rebuild_header(struct sk_buff *skb)
 692 {
 693         struct net_device *dev = skb->dev;
 694         struct ethhdr *eth = (struct ethhdr *) skb->data;
 695
 696         memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
 697         memcpy(eth->h_dest, dev->dev_addr, dev->addr_len);
 698
 699         return 0;
 700 }
 701 #endif /* < 4.1.0  */
 702
 703 /**
 704  * kni_net_set_mac - Change the Ethernet Address of the KNI NIC
 705  * @netdev: network interface device structure
 706  * @p: pointer to an address structure
 707  *
 708  * Returns 0 on success, negative on failure
 709  **/
 710 static int
 711 kni_net_set_mac(struct net_device *netdev, void *p)
 712 {
 713         int ret;
 714         struct rte_kni_request req;
 715         struct kni_dev *kni;
 716         struct sockaddr *addr = p;
 717
 718         memset(&req, 0, sizeof(req));
 719         req.req_id = RTE_KNI_REQ_CHANGE_MAC_ADDR;
 720
 721         if (!is_valid_ether_addr((unsigned char *)(addr->sa_data)))
 722                 return -EADDRNOTAVAIL;
 723
 724         memcpy(req.mac_addr, addr->sa_data, netdev->addr_len);
 725         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
 726
 727         kni = netdev_priv(netdev);
 728         ret = kni_net_process_request(kni, &req);
 729
 730         return (ret == 0 ? req.result : ret);
 731 }
 732
 733 #ifdef HAVE_CHANGE_CARRIER_CB
 734 static int
 735 kni_net_change_carrier(struct net_device *dev, bool new_carrier)
 736 {
 737         if (new_carrier)
 738                 netif_carrier_on(dev);
 739         else
 740                 netif_carrier_off(dev);
 741         return 0;
 742 }
 743 #endif
 744
 745 static const struct header_ops kni_net_header_ops = {
 746         .create  = kni_net_header,
 747         .parse   = eth_header_parse,
 748 #ifdef HAVE_REBUILD_HEADER
 749         .rebuild = kni_net_rebuild_header,
 750 #endif /* < 4.1.0  */
 751         .cache   = NULL,  /* disable caching */
 752 };
 753
 754 static const struct net_device_ops kni_net_netdev_ops = {
 755         .ndo_open = kni_net_open,
 756         .ndo_stop = kni_net_release,
 757         .ndo_set_config = kni_net_config,
 758         .ndo_change_rx_flags = kni_net_set_promiscusity,
 759         .ndo_start_xmit = kni_net_tx,
 760         .ndo_change_mtu = kni_net_change_mtu,
 761         .ndo_do_ioctl = kni_net_ioctl,
 762         .ndo_set_rx_mode = kni_net_set_rx_mode,
 763         .ndo_get_stats = kni_net_stats,
 764         .ndo_tx_timeout = kni_net_tx_timeout,
 765         .ndo_set_mac_address = kni_net_set_mac,
 766 #ifdef HAVE_CHANGE_CARRIER_CB
 767         .ndo_change_carrier = kni_net_change_carrier,
 768 #endif
 769 };
 770
 771 void
 772 kni_net_init(struct net_device *dev)
 773 {
 774         struct kni_dev *kni = netdev_priv(dev);
 775
 776         init_waitqueue_head(&kni->wq);
 777         mutex_init(&kni->sync_lock);
 778
 779         ether_setup(dev); /* assign some of the fields */
 780         dev->netdev_ops      = &kni_net_netdev_ops;
 781         dev->header_ops      = &kni_net_header_ops;
 782         dev->watchdog_timeo = WD_TIMEOUT;
 783 }
 784
 785 void
 786 kni_net_config_lo_mode(char *lo_str)
 787 {
 788         if (!lo_str) {
 789                 pr_debug("loopback disabled");
 790                 return;
 791         }
 792
 793         if (!strcmp(lo_str, "lo_mode_none"))
 794                 pr_debug("loopback disabled");
 795         else if (!strcmp(lo_str, "lo_mode_fifo")) {
 796                 pr_debug("loopback mode=lo_mode_fifo enabled");
 797                 kni_net_rx_func = kni_net_rx_lo_fifo;
 798         } else if (!strcmp(lo_str, "lo_mode_fifo_skb")) {
 799                 pr_debug("loopback mode=lo_mode_fifo_skb enabled");
 800                 kni_net_rx_func = kni_net_rx_lo_fifo_skb;
 801         } else
 802                 pr_debug("Incognizant parameter, loopback disabled");
 803 }