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