drivers/net/hyperv/netvsc_drv.c

   1 /*
   2  * Copyright (c) 2009, Microsoft Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Authors:
  18  *   Haiyang Zhang <haiyangz@microsoft.com>
  19  *   Hank Janssen  <hjanssen@microsoft.com>
  20  */
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/init.h>
  24 #include <linux/atomic.h>
  25 #include <linux/module.h>
  26 #include <linux/highmem.h>
  27 #include <linux/device.h>
  28 #include <linux/io.h>
  29 #include <linux/delay.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/inetdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/in.h>
  35 #include <linux/slab.h>
  36 #include <net/arp.h>
  37 #include <net/route.h>
  38 #include <net/sock.h>
  39 #include <net/pkt_sched.h>
  40
  41 #include "hyperv_net.h"
  42
  43 struct net_device_context {
  44         /* point back to our device context */
  45         struct hv_device *device_ctx;
  46         struct delayed_work dwork;
  47 };
  48
  49
  50 static int ring_size = 128;
  51 module_param(ring_size, int, S_IRUGO);
  52 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
  53
  54 struct set_multicast_work {
  55         struct work_struct work;
  56         struct net_device *net;
  57 };
  58
  59 static void do_set_multicast(struct work_struct *w)
  60 {
  61         struct set_multicast_work *swk =
  62                 container_of(w, struct set_multicast_work, work);
  63         struct net_device *net = swk->net;
  64
  65         struct net_device_context *ndevctx = netdev_priv(net);
  66         struct netvsc_device *nvdev;
  67         struct rndis_device *rdev;
  68
  69         nvdev = hv_get_drvdata(ndevctx->device_ctx);
  70         if (nvdev == NULL)
  71                 goto out;
  72
  73         rdev = nvdev->extension;
  74         if (rdev == NULL)
  75                 goto out;
  76
  77         if (net->flags & IFF_PROMISC)
  78                 rndis_filter_set_packet_filter(rdev,
  79                         NDIS_PACKET_TYPE_PROMISCUOUS);
  80         else
  81                 rndis_filter_set_packet_filter(rdev,
  82                         NDIS_PACKET_TYPE_BROADCAST |
  83                         NDIS_PACKET_TYPE_ALL_MULTICAST |
  84                         NDIS_PACKET_TYPE_DIRECTED);
  85
  86 out:
  87         kfree(w);
  88 }
  89
  90 static void netvsc_set_multicast_list(struct net_device *net)
  91 {
  92         struct set_multicast_work *swk =
  93                 kmalloc(sizeof(struct set_multicast_work), GFP_ATOMIC);
  94         if (swk == NULL)
  95                 return;
  96
  97         swk->net = net;
  98         INIT_WORK(&swk->work, do_set_multicast);
  99         schedule_work(&swk->work);
 100 }
 101
 102 static int netvsc_open(struct net_device *net)
 103 {
 104         struct net_device_context *net_device_ctx = netdev_priv(net);
 105         struct hv_device *device_obj = net_device_ctx->device_ctx;
 106         int ret = 0;
 107
 108         /* Open up the device */
 109         ret = rndis_filter_open(device_obj);
 110         if (ret != 0) {
 111                 netdev_err(net, "unable to open device (ret %d).\n", ret);
 112                 return ret;
 113         }
 114
 115         netif_start_queue(net);
 116
 117         return ret;
 118 }
 119
 120 static int netvsc_close(struct net_device *net)
 121 {
 122         struct net_device_context *net_device_ctx = netdev_priv(net);
 123         struct hv_device *device_obj = net_device_ctx->device_ctx;
 124         int ret;
 125
 126         netif_tx_disable(net);
 127
 128         ret = rndis_filter_close(device_obj);
 129         if (ret != 0)
 130                 netdev_err(net, "unable to close device (ret %d).\n", ret);
 131
 132         return ret;
 133 }
 134
 135 static void netvsc_xmit_completion(void *context)
 136 {
 137         struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
 138         struct sk_buff *skb = (struct sk_buff *)
 139                 (unsigned long)packet->completion.send.send_completion_tid;
 140
 141         kfree(packet);
 142
 143         if (skb)
 144                 dev_kfree_skb_any(skb);
 145 }
 146
 147 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 148 {
 149         struct net_device_context *net_device_ctx = netdev_priv(net);
 150         struct hv_netvsc_packet *packet;
 151         int ret;
 152         unsigned int i, num_pages, npg_data;
 153
 154         /* Add multipages for skb->data and additional 2 for RNDIS */
 155         npg_data = (((unsigned long)skb->data + skb_headlen(skb) - 1)
 156                 >> PAGE_SHIFT) - ((unsigned long)skb->data >> PAGE_SHIFT) + 1;
 157         num_pages = skb_shinfo(skb)->nr_frags + npg_data + 2;
 158
 159         /* Allocate a netvsc packet based on # of frags. */
 160         packet = kzalloc(sizeof(struct hv_netvsc_packet) +
 161                          (num_pages * sizeof(struct hv_page_buffer)) +
 162                          sizeof(struct rndis_filter_packet), GFP_ATOMIC);
 163         if (!packet) {
 164                 /* out of memory, drop packet */
 165                 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
 166
 167                 dev_kfree_skb(skb);
 168                 net->stats.tx_dropped++;
 169                 return NETDEV_TX_OK;
 170         }
 171
 172         packet->extension = (void *)(unsigned long)packet +
 173                                 sizeof(struct hv_netvsc_packet) +
 174                                     (num_pages * sizeof(struct hv_page_buffer));
 175
 176         /* If the rndis msg goes beyond 1 page, we will add 1 later */
 177         packet->page_buf_cnt = num_pages - 1;
 178
 179         /* Initialize it from the skb */
 180         packet->total_data_buflen = skb->len;
 181
 182         /* Start filling in the page buffers starting after RNDIS buffer. */
 183         packet->page_buf[1].pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
 184         packet->page_buf[1].offset
 185                 = (unsigned long)skb->data & (PAGE_SIZE - 1);
 186         if (npg_data == 1)
 187                 packet->page_buf[1].len = skb_headlen(skb);
 188         else
 189                 packet->page_buf[1].len = PAGE_SIZE
 190                         - packet->page_buf[1].offset;
 191
 192         for (i = 2; i <= npg_data; i++) {
 193                 packet->page_buf[i].pfn = virt_to_phys(skb->data
 194                         + PAGE_SIZE * (i-1)) >> PAGE_SHIFT;
 195                 packet->page_buf[i].offset = 0;
 196                 packet->page_buf[i].len = PAGE_SIZE;
 197         }
 198         if (npg_data > 1)
 199                 packet->page_buf[npg_data].len = (((unsigned long)skb->data
 200                         + skb_headlen(skb) - 1) & (PAGE_SIZE - 1)) + 1;
 201
 202         /* Additional fragments are after SKB data */
 203         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 204                 const skb_frag_t *f = &skb_shinfo(skb)->frags[i];
 205
 206                 packet->page_buf[i+npg_data+1].pfn =
 207                         page_to_pfn(skb_frag_page(f));
 208                 packet->page_buf[i+npg_data+1].offset = f->page_offset;
 209                 packet->page_buf[i+npg_data+1].len = skb_frag_size(f);
 210         }
 211
 212         /* Set the completion routine */
 213         packet->completion.send.send_completion = netvsc_xmit_completion;
 214         packet->completion.send.send_completion_ctx = packet;
 215         packet->completion.send.send_completion_tid = (unsigned long)skb;
 216
 217         ret = rndis_filter_send(net_device_ctx->device_ctx,
 218                                   packet);
 219         if (ret == 0) {
 220                 net->stats.tx_bytes += skb->len;
 221                 net->stats.tx_packets++;
 222         } else {
 223                 /* we are shutting down or bus overloaded, just drop packet */
 224                 net->stats.tx_dropped++;
 225                 kfree(packet);
 226                 dev_kfree_skb_any(skb);
 227         }
 228
 229         return NETDEV_TX_OK;
 230 }
 231
 232 /*
 233  * netvsc_linkstatus_callback - Link up/down notification
 234  */
 235 void netvsc_linkstatus_callback(struct hv_device *device_obj,
 236                                        unsigned int status)
 237 {
 238         struct net_device *net;
 239         struct net_device_context *ndev_ctx;
 240         struct netvsc_device *net_device;
 241
 242         net_device = hv_get_drvdata(device_obj);
 243         net = net_device->ndev;
 244
 245         if (!net) {
 246                 netdev_err(net, "got link status but net device "
 247                                 "not initialized yet\n");
 248                 return;
 249         }
 250
 251         if (status == 1) {
 252                 netif_carrier_on(net);
 253                 netif_wake_queue(net);
 254                 ndev_ctx = netdev_priv(net);
 255                 schedule_delayed_work(&ndev_ctx->dwork, 0);
 256                 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
 257         } else {
 258                 netif_carrier_off(net);
 259                 netif_tx_disable(net);
 260         }
 261 }
 262
 263 /*
 264  * netvsc_recv_callback -  Callback when we receive a packet from the
 265  * "wire" on the specified device.
 266  */
 267 int netvsc_recv_callback(struct hv_device *device_obj,
 268                                 struct hv_netvsc_packet *packet)
 269 {
 270         struct net_device *net = dev_get_drvdata(&device_obj->device);
 271         struct sk_buff *skb;
 272         struct netvsc_device *net_device;
 273
 274         net_device = hv_get_drvdata(device_obj);
 275         net = net_device->ndev;
 276
 277         if (!net) {
 278                 netdev_err(net, "got receive callback but net device"
 279                         " not initialized yet\n");
 280                 return 0;
 281         }
 282
 283         /* Allocate a skb - TODO direct I/O to pages? */
 284         skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
 285         if (unlikely(!skb)) {
 286                 ++net->stats.rx_dropped;
 287                 return 0;
 288         }
 289
 290         /*
 291          * Copy to skb. This copy is needed here since the memory pointed by
 292          * hv_netvsc_packet cannot be deallocated
 293          */
 294         memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
 295                 packet->total_data_buflen);
 296
 297         skb->protocol = eth_type_trans(skb, net);
 298         skb->ip_summed = CHECKSUM_NONE;
 299
 300         net->stats.rx_packets++;
 301         net->stats.rx_bytes += packet->total_data_buflen;
 302
 303         /*
 304          * Pass the skb back up. Network stack will deallocate the skb when it
 305          * is done.
 306          * TODO - use NAPI?
 307          */
 308         netif_rx(skb);
 309
 310         return 0;
 311 }
 312
 313 static void netvsc_get_drvinfo(struct net_device *net,
 314                                struct ethtool_drvinfo *info)
 315 {
 316         strcpy(info->driver, KBUILD_MODNAME);
 317         strcpy(info->version, HV_DRV_VERSION);
 318         strcpy(info->fw_version, "N/A");
 319 }
 320
 321 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 322 {
 323         struct net_device_context *ndevctx = netdev_priv(ndev);
 324         struct hv_device *hdev =  ndevctx->device_ctx;
 325         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 326         struct netvsc_device_info device_info;
 327         int limit = ETH_DATA_LEN;
 328
 329         if (nvdev == NULL || nvdev->destroy)
 330                 return -ENODEV;
 331
 332         if (nvdev->nvsp_version == NVSP_PROTOCOL_VERSION_2)
 333                 limit = NETVSC_MTU;
 334
 335         if (mtu < 68 || mtu > limit)
 336                 return -EINVAL;
 337
 338         nvdev->start_remove = true;
 339         cancel_delayed_work_sync(&ndevctx->dwork);
 340         netif_tx_disable(ndev);
 341         rndis_filter_device_remove(hdev);
 342
 343         ndev->mtu = mtu;
 344
 345         ndevctx->device_ctx = hdev;
 346         hv_set_drvdata(hdev, ndev);
 347         device_info.ring_size = ring_size;
 348         rndis_filter_device_add(hdev, &device_info);
 349         netif_wake_queue(ndev);
 350
 351         return 0;
 352 }
 353
 354 static const struct ethtool_ops ethtool_ops = {
 355         .get_drvinfo    = netvsc_get_drvinfo,
 356         .get_link       = ethtool_op_get_link,
 357 };
 358
 359 static const struct net_device_ops device_ops = {
 360         .ndo_open =                     netvsc_open,
 361         .ndo_stop =                     netvsc_close,
 362         .ndo_start_xmit =               netvsc_start_xmit,
 363         .ndo_set_rx_mode =              netvsc_set_multicast_list,
 364         .ndo_change_mtu =               netvsc_change_mtu,
 365         .ndo_validate_addr =            eth_validate_addr,
 366         .ndo_set_mac_address =          eth_mac_addr,
 367 };
 368
 369 /*
 370  * Send GARP packet to network peers after migrations.
 371  * After Quick Migration, the network is not immediately operational in the
 372  * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
 373  * another netif_notify_peers() into a delayed work, otherwise GARP packet
 374  * will not be sent after quick migration, and cause network disconnection.
 375  */
 376 static void netvsc_send_garp(struct work_struct *w)
 377 {
 378         struct net_device_context *ndev_ctx;
 379         struct net_device *net;
 380         struct netvsc_device *net_device;
 381
 382         ndev_ctx = container_of(w, struct net_device_context, dwork.work);
 383         net_device = hv_get_drvdata(ndev_ctx->device_ctx);
 384         net = net_device->ndev;
 385         netif_notify_peers(net);
 386 }
 387
 388
 389 static int netvsc_probe(struct hv_device *dev,
 390                         const struct hv_vmbus_device_id *dev_id)
 391 {
 392         struct net_device *net = NULL;
 393         struct net_device_context *net_device_ctx;
 394         struct netvsc_device_info device_info;
 395         int ret;
 396
 397         net = alloc_etherdev(sizeof(struct net_device_context));
 398         if (!net)
 399                 return -ENOMEM;
 400
 401         /* Set initial state */
 402         netif_carrier_off(net);
 403
 404         net_device_ctx = netdev_priv(net);
 405         net_device_ctx->device_ctx = dev;
 406         hv_set_drvdata(dev, net);
 407         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp);
 408
 409         net->netdev_ops = &device_ops;
 410
 411         /* TODO: Add GSO and Checksum offload */
 412         net->hw_features = NETIF_F_SG;
 413         net->features = NETIF_F_SG;
 414
 415         SET_ETHTOOL_OPS(net, &ethtool_ops);
 416         SET_NETDEV_DEV(net, &dev->device);
 417
 418         ret = register_netdev(net);
 419         if (ret != 0) {
 420                 pr_err("Unable to register netdev.\n");
 421                 free_netdev(net);
 422                 goto out;
 423         }
 424
 425         /* Notify the netvsc driver of the new device */
 426         device_info.ring_size = ring_size;
 427         ret = rndis_filter_device_add(dev, &device_info);
 428         if (ret != 0) {
 429                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
 430                 unregister_netdev(net);
 431                 free_netdev(net);
 432                 hv_set_drvdata(dev, NULL);
 433                 return ret;
 434         }
 435         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
 436
 437         netif_carrier_on(net);
 438
 439 out:
 440         return ret;
 441 }
 442
 443 static int netvsc_remove(struct hv_device *dev)
 444 {
 445         struct net_device *net;
 446         struct net_device_context *ndev_ctx;
 447         struct netvsc_device *net_device;
 448
 449         net_device = hv_get_drvdata(dev);
 450         net = net_device->ndev;
 451
 452         if (net == NULL) {
 453                 dev_err(&dev->device, "No net device to remove\n");
 454                 return 0;
 455         }
 456
 457         net_device->start_remove = true;
 458
 459         ndev_ctx = netdev_priv(net);
 460         cancel_delayed_work_sync(&ndev_ctx->dwork);
 461
 462         /* Stop outbound asap */
 463         netif_tx_disable(net);
 464
 465         unregister_netdev(net);
 466
 467         /*
 468          * Call to the vsc driver to let it know that the device is being
 469          * removed
 470          */
 471         rndis_filter_device_remove(dev);
 472
 473         free_netdev(net);
 474         return 0;
 475 }
 476
 477 static const struct hv_vmbus_device_id id_table[] = {
 478         /* Network guid */
 479         { VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
 480                        0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) },
 481         { },
 482 };
 483
 484 MODULE_DEVICE_TABLE(vmbus, id_table);
 485
 486 /* The one and only one */
 487 static struct  hv_driver netvsc_drv = {
 488         .name = KBUILD_MODNAME,
 489         .id_table = id_table,
 490         .probe = netvsc_probe,
 491         .remove = netvsc_remove,
 492 };
 493
 494 static void __exit netvsc_drv_exit(void)
 495 {
 496         vmbus_driver_unregister(&netvsc_drv);
 497 }
 498
 499 static int __init netvsc_drv_init(void)
 500 {
 501         return vmbus_driver_register(&netvsc_drv);
 502 }
 503
 504 MODULE_LICENSE("GPL");
 505 MODULE_VERSION(HV_DRV_VERSION);
 506 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
 507
 508 module_init(netvsc_drv_init);
 509 module_exit(netvsc_drv_exit);