Pileus Git - ~andy/linux/blob - 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, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Authors:
  17  *   Haiyang Zhang <haiyangz@microsoft.com>
  18  *   Hank Janssen  <hjanssen@microsoft.com>
  19  */
  20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  21
  22 #include <linux/init.h>
  23 #include <linux/atomic.h>
  24 #include <linux/module.h>
  25 #include <linux/highmem.h>
  26 #include <linux/device.h>
  27 #include <linux/io.h>
  28 #include <linux/delay.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/inetdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/if_vlan.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         struct work_struct work;
  48 };
  49
  50 #define RING_SIZE_MIN 64
  51 static int ring_size = 128;
  52 module_param(ring_size, int, S_IRUGO);
  53 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
  54
  55 static void do_set_multicast(struct work_struct *w)
  56 {
  57         struct net_device_context *ndevctx =
  58                 container_of(w, struct net_device_context, work);
  59         struct netvsc_device *nvdev;
  60         struct rndis_device *rdev;
  61
  62         nvdev = hv_get_drvdata(ndevctx->device_ctx);
  63         if (nvdev == NULL || nvdev->ndev == NULL)
  64                 return;
  65
  66         rdev = nvdev->extension;
  67         if (rdev == NULL)
  68                 return;
  69
  70         if (nvdev->ndev->flags & IFF_PROMISC)
  71                 rndis_filter_set_packet_filter(rdev,
  72                         NDIS_PACKET_TYPE_PROMISCUOUS);
  73         else
  74                 rndis_filter_set_packet_filter(rdev,
  75                         NDIS_PACKET_TYPE_BROADCAST |
  76                         NDIS_PACKET_TYPE_ALL_MULTICAST |
  77                         NDIS_PACKET_TYPE_DIRECTED);
  78 }
  79
  80 static void netvsc_set_multicast_list(struct net_device *net)
  81 {
  82         struct net_device_context *net_device_ctx = netdev_priv(net);
  83
  84         schedule_work(&net_device_ctx->work);
  85 }
  86
  87 static int netvsc_open(struct net_device *net)
  88 {
  89         struct net_device_context *net_device_ctx = netdev_priv(net);
  90         struct hv_device *device_obj = net_device_ctx->device_ctx;
  91         struct netvsc_device *nvdev;
  92         struct rndis_device *rdev;
  93         int ret = 0;
  94
  95         netif_carrier_off(net);
  96
  97         /* Open up the device */
  98         ret = rndis_filter_open(device_obj);
  99         if (ret != 0) {
 100                 netdev_err(net, "unable to open device (ret %d).\n", ret);
 101                 return ret;
 102         }
 103
 104         netif_start_queue(net);
 105
 106         nvdev = hv_get_drvdata(device_obj);
 107         rdev = nvdev->extension;
 108         if (!rdev->link_state)
 109                 netif_carrier_on(net);
 110
 111         return ret;
 112 }
 113
 114 static int netvsc_close(struct net_device *net)
 115 {
 116         struct net_device_context *net_device_ctx = netdev_priv(net);
 117         struct hv_device *device_obj = net_device_ctx->device_ctx;
 118         int ret;
 119
 120         netif_tx_disable(net);
 121
 122         /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
 123         cancel_work_sync(&net_device_ctx->work);
 124         ret = rndis_filter_close(device_obj);
 125         if (ret != 0)
 126                 netdev_err(net, "unable to close device (ret %d).\n", ret);
 127
 128         return ret;
 129 }
 130
 131 static void netvsc_xmit_completion(void *context)
 132 {
 133         struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
 134         struct sk_buff *skb = (struct sk_buff *)
 135                 (unsigned long)packet->completion.send.send_completion_tid;
 136
 137         kfree(packet);
 138
 139         if (skb)
 140                 dev_kfree_skb_any(skb);
 141 }
 142
 143 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 144 {
 145         struct net_device_context *net_device_ctx = netdev_priv(net);
 146         struct hv_netvsc_packet *packet;
 147         int ret;
 148         unsigned int i, num_pages, npg_data;
 149
 150         /* Add multipages for skb->data and additional 2 for RNDIS */
 151         npg_data = (((unsigned long)skb->data + skb_headlen(skb) - 1)
 152                 >> PAGE_SHIFT) - ((unsigned long)skb->data >> PAGE_SHIFT) + 1;
 153         num_pages = skb_shinfo(skb)->nr_frags + npg_data + 2;
 154
 155         /* Allocate a netvsc packet based on # of frags. */
 156         packet = kzalloc(sizeof(struct hv_netvsc_packet) +
 157                          (num_pages * sizeof(struct hv_page_buffer)) +
 158                          sizeof(struct rndis_filter_packet) +
 159                          NDIS_VLAN_PPI_SIZE, GFP_ATOMIC);
 160         if (!packet) {
 161                 /* out of memory, drop packet */
 162                 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
 163
 164                 dev_kfree_skb(skb);
 165                 net->stats.tx_dropped++;
 166                 return NETDEV_TX_OK;
 167         }
 168
 169         packet->vlan_tci = skb->vlan_tci;
 170
 171         packet->extension = (void *)(unsigned long)packet +
 172                                 sizeof(struct hv_netvsc_packet) +
 173                                     (num_pages * sizeof(struct hv_page_buffer));
 174
 175         /* If the rndis msg goes beyond 1 page, we will add 1 later */
 176         packet->page_buf_cnt = num_pages - 1;
 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                 kfree(packet);
 223                 if (ret != -EAGAIN) {
 224                         dev_kfree_skb_any(skb);
 225                         net->stats.tx_dropped++;
 226                 }
 227         }
 228
 229         return (ret == -EAGAIN) ? NETDEV_TX_BUSY : 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         struct rndis_device *rdev;
 242
 243         net_device = hv_get_drvdata(device_obj);
 244         rdev = net_device->extension;
 245
 246         rdev->link_state = status != 1;
 247
 248         net = net_device->ndev;
 249
 250         if (!net || net->reg_state != NETREG_REGISTERED)
 251                 return;
 252
 253         ndev_ctx = netdev_priv(net);
 254         if (status == 1) {
 255                 schedule_delayed_work(&ndev_ctx->dwork, 0);
 256                 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
 257         } else {
 258                 schedule_delayed_work(&ndev_ctx->dwork, 0);
 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;
 270         struct sk_buff *skb;
 271
 272         net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
 273         if (!net || net->reg_state != NETREG_REGISTERED) {
 274                 packet->status = NVSP_STAT_FAIL;
 275                 return 0;
 276         }
 277
 278         /* Allocate a skb - TODO direct I/O to pages? */
 279         skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
 280         if (unlikely(!skb)) {
 281                 ++net->stats.rx_dropped;
 282                 packet->status = NVSP_STAT_FAIL;
 283                 return 0;
 284         }
 285
 286         /*
 287          * Copy to skb. This copy is needed here since the memory pointed by
 288          * hv_netvsc_packet cannot be deallocated
 289          */
 290         memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
 291                 packet->total_data_buflen);
 292
 293         skb->protocol = eth_type_trans(skb, net);
 294         skb->ip_summed = CHECKSUM_NONE;
 295         if (packet->vlan_tci & VLAN_TAG_PRESENT)
 296                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 297                                        packet->vlan_tci);
 298
 299         net->stats.rx_packets++;
 300         net->stats.rx_bytes += packet->total_data_buflen;
 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         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 316         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 317 }
 318
 319 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
 320 {
 321         struct net_device_context *ndevctx = netdev_priv(ndev);
 322         struct hv_device *hdev =  ndevctx->device_ctx;
 323         struct netvsc_device *nvdev = hv_get_drvdata(hdev);
 324         struct netvsc_device_info device_info;
 325         int limit = ETH_DATA_LEN;
 326
 327         if (nvdev == NULL || nvdev->destroy)
 328                 return -ENODEV;
 329
 330         if (nvdev->nvsp_version == NVSP_PROTOCOL_VERSION_2)
 331                 limit = NETVSC_MTU;
 332
 333         if (mtu < 68 || mtu > limit)
 334                 return -EINVAL;
 335
 336         nvdev->start_remove = true;
 337         cancel_work_sync(&ndevctx->work);
 338         netif_tx_disable(ndev);
 339         rndis_filter_device_remove(hdev);
 340
 341         ndev->mtu = mtu;
 342
 343         ndevctx->device_ctx = hdev;
 344         hv_set_drvdata(hdev, ndev);
 345         device_info.ring_size = ring_size;
 346         rndis_filter_device_add(hdev, &device_info);
 347         netif_wake_queue(ndev);
 348
 349         return 0;
 350 }
 351
 352
 353 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
 354 {
 355         struct net_device_context *ndevctx = netdev_priv(ndev);
 356         struct hv_device *hdev =  ndevctx->device_ctx;
 357         struct sockaddr *addr = p;
 358         char save_adr[ETH_ALEN];
 359         unsigned char save_aatype;
 360         int err;
 361
 362         memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
 363         save_aatype = ndev->addr_assign_type;
 364
 365         err = eth_mac_addr(ndev, p);
 366         if (err != 0)
 367                 return err;
 368
 369         err = rndis_filter_set_device_mac(hdev, addr->sa_data);
 370         if (err != 0) {
 371                 /* roll back to saved MAC */
 372                 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
 373                 ndev->addr_assign_type = save_aatype;
 374         }
 375
 376         return err;
 377 }
 378
 379
 380 static const struct ethtool_ops ethtool_ops = {
 381         .get_drvinfo    = netvsc_get_drvinfo,
 382         .get_link       = ethtool_op_get_link,
 383 };
 384
 385 static const struct net_device_ops device_ops = {
 386         .ndo_open =                     netvsc_open,
 387         .ndo_stop =                     netvsc_close,
 388         .ndo_start_xmit =               netvsc_start_xmit,
 389         .ndo_set_rx_mode =              netvsc_set_multicast_list,
 390         .ndo_change_mtu =               netvsc_change_mtu,
 391         .ndo_validate_addr =            eth_validate_addr,
 392         .ndo_set_mac_address =          netvsc_set_mac_addr,
 393 };
 394
 395 /*
 396  * Send GARP packet to network peers after migrations.
 397  * After Quick Migration, the network is not immediately operational in the
 398  * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
 399  * another netif_notify_peers() into a delayed work, otherwise GARP packet
 400  * will not be sent after quick migration, and cause network disconnection.
 401  * Also, we update the carrier status here.
 402  */
 403 static void netvsc_link_change(struct work_struct *w)
 404 {
 405         struct net_device_context *ndev_ctx;
 406         struct net_device *net;
 407         struct netvsc_device *net_device;
 408         struct rndis_device *rdev;
 409         bool notify;
 410
 411         rtnl_lock();
 412
 413         ndev_ctx = container_of(w, struct net_device_context, dwork.work);
 414         net_device = hv_get_drvdata(ndev_ctx->device_ctx);
 415         rdev = net_device->extension;
 416         net = net_device->ndev;
 417
 418         if (rdev->link_state) {
 419                 netif_carrier_off(net);
 420                 notify = false;
 421         } else {
 422                 netif_carrier_on(net);
 423                 notify = true;
 424         }
 425
 426         rtnl_unlock();
 427
 428         if (notify)
 429                 netdev_notify_peers(net);
 430 }
 431
 432
 433 static int netvsc_probe(struct hv_device *dev,
 434                         const struct hv_vmbus_device_id *dev_id)
 435 {
 436         struct net_device *net = NULL;
 437         struct net_device_context *net_device_ctx;
 438         struct netvsc_device_info device_info;
 439         int ret;
 440
 441         net = alloc_etherdev(sizeof(struct net_device_context));
 442         if (!net)
 443                 return -ENOMEM;
 444
 445         net_device_ctx = netdev_priv(net);
 446         net_device_ctx->device_ctx = dev;
 447         hv_set_drvdata(dev, net);
 448         INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
 449         INIT_WORK(&net_device_ctx->work, do_set_multicast);
 450
 451         net->netdev_ops = &device_ops;
 452
 453         /* TODO: Add GSO and Checksum offload */
 454         net->hw_features = 0;
 455         net->features = NETIF_F_HW_VLAN_CTAG_TX;
 456
 457         SET_ETHTOOL_OPS(net, &ethtool_ops);
 458         SET_NETDEV_DEV(net, &dev->device);
 459
 460         /* Notify the netvsc driver of the new device */
 461         device_info.ring_size = ring_size;
 462         ret = rndis_filter_device_add(dev, &device_info);
 463         if (ret != 0) {
 464                 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
 465                 free_netdev(net);
 466                 hv_set_drvdata(dev, NULL);
 467                 return ret;
 468         }
 469         memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
 470
 471         ret = register_netdev(net);
 472         if (ret != 0) {
 473                 pr_err("Unable to register netdev.\n");
 474                 rndis_filter_device_remove(dev);
 475                 free_netdev(net);
 476         }
 477
 478         return ret;
 479 }
 480
 481 static int netvsc_remove(struct hv_device *dev)
 482 {
 483         struct net_device *net;
 484         struct net_device_context *ndev_ctx;
 485         struct netvsc_device *net_device;
 486
 487         net_device = hv_get_drvdata(dev);
 488         net = net_device->ndev;
 489
 490         if (net == NULL) {
 491                 dev_err(&dev->device, "No net device to remove\n");
 492                 return 0;
 493         }
 494
 495         net_device->start_remove = true;
 496
 497         ndev_ctx = netdev_priv(net);
 498         cancel_delayed_work_sync(&ndev_ctx->dwork);
 499         cancel_work_sync(&ndev_ctx->work);
 500
 501         /* Stop outbound asap */
 502         netif_tx_disable(net);
 503
 504         unregister_netdev(net);
 505
 506         /*
 507          * Call to the vsc driver to let it know that the device is being
 508          * removed
 509          */
 510         rndis_filter_device_remove(dev);
 511
 512         free_netdev(net);
 513         return 0;
 514 }
 515
 516 static const struct hv_vmbus_device_id id_table[] = {
 517         /* Network guid */
 518         { HV_NIC_GUID, },
 519         { },
 520 };
 521
 522 MODULE_DEVICE_TABLE(vmbus, id_table);
 523
 524 /* The one and only one */
 525 static struct  hv_driver netvsc_drv = {
 526         .name = KBUILD_MODNAME,
 527         .id_table = id_table,
 528         .probe = netvsc_probe,
 529         .remove = netvsc_remove,
 530 };
 531
 532 static void __exit netvsc_drv_exit(void)
 533 {
 534         vmbus_driver_unregister(&netvsc_drv);
 535 }
 536
 537 static int __init netvsc_drv_init(void)
 538 {
 539         if (ring_size < RING_SIZE_MIN) {
 540                 ring_size = RING_SIZE_MIN;
 541                 pr_info("Increased ring_size to %d (min allowed)\n",
 542                         ring_size);
 543         }
 544         return vmbus_driver_register(&netvsc_drv);
 545 }
 546
 547 MODULE_LICENSE("GPL");
 548 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
 549
 550 module_init(netvsc_drv_init);
 551 module_exit(netvsc_drv_exit);