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/kernel.h> 24 #include <linux/sched.h> 25 #include <linux/wait.h> 26 #include <linux/mm.h> 27 #include <linux/delay.h> 28 #include <linux/io.h> 29 #include <linux/slab.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_ether.h> 32 33 #include "hyperv_net.h" 34 35 36 static struct netvsc_device *alloc_net_device(struct hv_device *device) 37 { 38 struct netvsc_device *net_device; 39 struct net_device *ndev = hv_get_drvdata(device); 40 41 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 42 if (!net_device) 43 return NULL; 44 45 init_waitqueue_head(&net_device->wait_drain); 46 net_device->start_remove = false; 47 net_device->destroy = false; 48 net_device->dev = device; 49 net_device->ndev = ndev; 50 51 hv_set_drvdata(device, net_device); 52 return net_device; 53 } 54 55 static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 56 { 57 struct netvsc_device *net_device; 58 59 net_device = hv_get_drvdata(device); 60 if (net_device && net_device->destroy) 61 net_device = NULL; 62 63 return net_device; 64 } 65 66 static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 67 { 68 struct netvsc_device *net_device; 69 70 net_device = hv_get_drvdata(device); 71 72 if (!net_device) 73 goto get_in_err; 74 75 if (net_device->destroy && 76 atomic_read(&net_device->num_outstanding_sends) == 0) 77 net_device = NULL; 78 79 get_in_err: 80 return net_device; 81 } 82 83 84 static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) 85 { 86 struct nvsp_message *revoke_packet; 87 int ret = 0; 88 struct net_device *ndev = net_device->ndev; 89 90 /* 91 * If we got a section count, it means we received a 92 * SendReceiveBufferComplete msg (ie sent 93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 94 * to send a revoke msg here 95 */ 96 if (net_device->recv_section_cnt) { 97 /* Send the revoke receive buffer */ 98 revoke_packet = &net_device->revoke_packet; 99 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 100 101 revoke_packet->hdr.msg_type = 102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 103 revoke_packet->msg.v1_msg. 104 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 105 106 ret = vmbus_sendpacket(net_device->dev->channel, 107 revoke_packet, 108 sizeof(struct nvsp_message), 109 (unsigned long)revoke_packet, 110 VM_PKT_DATA_INBAND, 0); 111 /* 112 * If we failed here, we might as well return and 113 * have a leak rather than continue and a bugchk 114 */ 115 if (ret != 0) { 116 netdev_err(ndev, "unable to send " 117 "revoke receive buffer to netvsp\n"); 118 return ret; 119 } 120 } 121 122 /* Teardown the gpadl on the vsp end */ 123 if (net_device->recv_buf_gpadl_handle) { 124 ret = vmbus_teardown_gpadl(net_device->dev->channel, 125 net_device->recv_buf_gpadl_handle); 126 127 /* If we failed here, we might as well return and have a leak 128 * rather than continue and a bugchk 129 */ 130 if (ret != 0) { 131 netdev_err(ndev, 132 "unable to teardown receive buffer's gpadl\n"); 133 return ret; 134 } 135 net_device->recv_buf_gpadl_handle = 0; 136 } 137 138 if (net_device->recv_buf) { 139 /* Free up the receive buffer */ 140 free_pages((unsigned long)net_device->recv_buf, 141 get_order(net_device->recv_buf_size)); 142 net_device->recv_buf = NULL; 143 } 144 145 if (net_device->recv_section) { 146 net_device->recv_section_cnt = 0; 147 kfree(net_device->recv_section); 148 net_device->recv_section = NULL; 149 } 150 151 return ret; 152 } 153 154 static int netvsc_init_recv_buf(struct hv_device *device) 155 { 156 int ret = 0; 157 int t; 158 struct netvsc_device *net_device; 159 struct nvsp_message *init_packet; 160 struct net_device *ndev; 161 162 net_device = get_outbound_net_device(device); 163 if (!net_device) 164 return -ENODEV; 165 ndev = net_device->ndev; 166 167 net_device->recv_buf = 168 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 169 get_order(net_device->recv_buf_size)); 170 if (!net_device->recv_buf) { 171 netdev_err(ndev, "unable to allocate receive " 172 "buffer of size %d\n", net_device->recv_buf_size); 173 ret = -ENOMEM; 174 goto cleanup; 175 } 176 177 /* 178 * Establish the gpadl handle for this buffer on this 179 * channel. Note: This call uses the vmbus connection rather 180 * than the channel to establish the gpadl handle. 181 */ 182 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 183 net_device->recv_buf_size, 184 &net_device->recv_buf_gpadl_handle); 185 if (ret != 0) { 186 netdev_err(ndev, 187 "unable to establish receive buffer's gpadl\n"); 188 goto cleanup; 189 } 190 191 192 /* Notify the NetVsp of the gpadl handle */ 193 init_packet = &net_device->channel_init_pkt; 194 195 memset(init_packet, 0, sizeof(struct nvsp_message)); 196 197 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 198 init_packet->msg.v1_msg.send_recv_buf. 199 gpadl_handle = net_device->recv_buf_gpadl_handle; 200 init_packet->msg.v1_msg. 201 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 202 203 /* Send the gpadl notification request */ 204 ret = vmbus_sendpacket(device->channel, init_packet, 205 sizeof(struct nvsp_message), 206 (unsigned long)init_packet, 207 VM_PKT_DATA_INBAND, 208 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 209 if (ret != 0) { 210 netdev_err(ndev, 211 "unable to send receive buffer's gpadl to netvsp\n"); 212 goto cleanup; 213 } 214 215 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 216 BUG_ON(t == 0); 217 218 219 /* Check the response */ 220 if (init_packet->msg.v1_msg. 221 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 222 netdev_err(ndev, "Unable to complete receive buffer " 223 "initialization with NetVsp - status %d\n", 224 init_packet->msg.v1_msg. 225 send_recv_buf_complete.status); 226 ret = -EINVAL; 227 goto cleanup; 228 } 229 230 /* Parse the response */ 231 232 net_device->recv_section_cnt = init_packet->msg. 233 v1_msg.send_recv_buf_complete.num_sections; 234 235 net_device->recv_section = kmemdup( 236 init_packet->msg.v1_msg.send_recv_buf_complete.sections, 237 net_device->recv_section_cnt * 238 sizeof(struct nvsp_1_receive_buffer_section), 239 GFP_KERNEL); 240 if (net_device->recv_section == NULL) { 241 ret = -EINVAL; 242 goto cleanup; 243 } 244 245 /* 246 * For 1st release, there should only be 1 section that represents the 247 * entire receive buffer 248 */ 249 if (net_device->recv_section_cnt != 1 || 250 net_device->recv_section->offset != 0) { 251 ret = -EINVAL; 252 goto cleanup; 253 } 254 255 goto exit; 256 257 cleanup: 258 netvsc_destroy_recv_buf(net_device); 259 260 exit: 261 return ret; 262 } 263 264 265 /* Negotiate NVSP protocol version */ 266 static int negotiate_nvsp_ver(struct hv_device *device, 267 struct netvsc_device *net_device, 268 struct nvsp_message *init_packet, 269 u32 nvsp_ver) 270 { 271 int ret, t; 272 273 memset(init_packet, 0, sizeof(struct nvsp_message)); 274 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 275 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 276 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 277 278 /* Send the init request */ 279 ret = vmbus_sendpacket(device->channel, init_packet, 280 sizeof(struct nvsp_message), 281 (unsigned long)init_packet, 282 VM_PKT_DATA_INBAND, 283 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 284 285 if (ret != 0) 286 return ret; 287 288 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 289 290 if (t == 0) 291 return -ETIMEDOUT; 292 293 if (init_packet->msg.init_msg.init_complete.status != 294 NVSP_STAT_SUCCESS) 295 return -EINVAL; 296 297 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2) 298 return 0; 299 300 /* NVSPv2 only: Send NDIS config */ 301 memset(init_packet, 0, sizeof(struct nvsp_message)); 302 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 303 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; 304 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 305 306 ret = vmbus_sendpacket(device->channel, init_packet, 307 sizeof(struct nvsp_message), 308 (unsigned long)init_packet, 309 VM_PKT_DATA_INBAND, 0); 310 311 return ret; 312 } 313 314 static int netvsc_connect_vsp(struct hv_device *device) 315 { 316 int ret; 317 struct netvsc_device *net_device; 318 struct nvsp_message *init_packet; 319 int ndis_version; 320 struct net_device *ndev; 321 322 net_device = get_outbound_net_device(device); 323 if (!net_device) 324 return -ENODEV; 325 ndev = net_device->ndev; 326 327 init_packet = &net_device->channel_init_pkt; 328 329 /* Negotiate the latest NVSP protocol supported */ 330 if (negotiate_nvsp_ver(device, net_device, init_packet, 331 NVSP_PROTOCOL_VERSION_2) == 0) { 332 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2; 333 } else if (negotiate_nvsp_ver(device, net_device, init_packet, 334 NVSP_PROTOCOL_VERSION_1) == 0) { 335 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1; 336 } else { 337 ret = -EPROTO; 338 goto cleanup; 339 } 340 341 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 342 343 /* Send the ndis version */ 344 memset(init_packet, 0, sizeof(struct nvsp_message)); 345 346 ndis_version = 0x00050001; 347 348 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 349 init_packet->msg.v1_msg. 350 send_ndis_ver.ndis_major_ver = 351 (ndis_version & 0xFFFF0000) >> 16; 352 init_packet->msg.v1_msg. 353 send_ndis_ver.ndis_minor_ver = 354 ndis_version & 0xFFFF; 355 356 /* Send the init request */ 357 ret = vmbus_sendpacket(device->channel, init_packet, 358 sizeof(struct nvsp_message), 359 (unsigned long)init_packet, 360 VM_PKT_DATA_INBAND, 0); 361 if (ret != 0) 362 goto cleanup; 363 364 /* Post the big receive buffer to NetVSP */ 365 ret = netvsc_init_recv_buf(device); 366 367 cleanup: 368 return ret; 369 } 370 371 static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 372 { 373 netvsc_destroy_recv_buf(net_device); 374 } 375 376 /* 377 * netvsc_device_remove - Callback when the root bus device is removed 378 */ 379 int netvsc_device_remove(struct hv_device *device) 380 { 381 struct netvsc_device *net_device; 382 struct hv_netvsc_packet *netvsc_packet, *pos; 383 unsigned long flags; 384 385 net_device = hv_get_drvdata(device); 386 spin_lock_irqsave(&device->channel->inbound_lock, flags); 387 net_device->destroy = true; 388 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 389 390 /* Wait for all send completions */ 391 wait_event(net_device->wait_drain, 392 atomic_read(&net_device->num_outstanding_sends) == 0); 393 394 netvsc_disconnect_vsp(net_device); 395 396 /* 397 * Since we have already drained, we don't need to busy wait 398 * as was done in final_release_stor_device() 399 * Note that we cannot set the ext pointer to NULL until 400 * we have drained - to drain the outgoing packets, we need to 401 * allow incoming packets. 402 */ 403 404 spin_lock_irqsave(&device->channel->inbound_lock, flags); 405 hv_set_drvdata(device, NULL); 406 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 407 408 /* 409 * At this point, no one should be accessing net_device 410 * except in here 411 */ 412 dev_notice(&device->device, "net device safe to remove\n"); 413 414 /* Now, we can close the channel safely */ 415 vmbus_close(device->channel); 416 417 /* Release all resources */ 418 list_for_each_entry_safe(netvsc_packet, pos, 419 &net_device->recv_pkt_list, list_ent) { 420 list_del(&netvsc_packet->list_ent); 421 kfree(netvsc_packet); 422 } 423 424 kfree(net_device); 425 return 0; 426 } 427 428 429 #define RING_AVAIL_PERCENT_HIWATER 20 430 #define RING_AVAIL_PERCENT_LOWATER 10 431 432 /* 433 * Get the percentage of available bytes to write in the ring. 434 * The return value is in range from 0 to 100. 435 */ 436 static inline u32 hv_ringbuf_avail_percent( 437 struct hv_ring_buffer_info *ring_info) 438 { 439 u32 avail_read, avail_write; 440 441 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 442 443 return avail_write * 100 / ring_info->ring_datasize; 444 } 445 446 static void netvsc_send_completion(struct hv_device *device, 447 struct vmpacket_descriptor *packet) 448 { 449 struct netvsc_device *net_device; 450 struct nvsp_message *nvsp_packet; 451 struct hv_netvsc_packet *nvsc_packet; 452 struct net_device *ndev; 453 454 net_device = get_inbound_net_device(device); 455 if (!net_device) 456 return; 457 ndev = net_device->ndev; 458 459 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 460 (packet->offset8 << 3)); 461 462 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 463 (nvsp_packet->hdr.msg_type == 464 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 465 (nvsp_packet->hdr.msg_type == 466 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 467 /* Copy the response back */ 468 memcpy(&net_device->channel_init_pkt, nvsp_packet, 469 sizeof(struct nvsp_message)); 470 complete(&net_device->channel_init_wait); 471 } else if (nvsp_packet->hdr.msg_type == 472 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 473 int num_outstanding_sends; 474 475 /* Get the send context */ 476 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 477 packet->trans_id; 478 479 /* Notify the layer above us */ 480 nvsc_packet->completion.send.send_completion( 481 nvsc_packet->completion.send.send_completion_ctx); 482 483 num_outstanding_sends = 484 atomic_dec_return(&net_device->num_outstanding_sends); 485 486 if (net_device->destroy && num_outstanding_sends == 0) 487 wake_up(&net_device->wait_drain); 488 489 if (netif_queue_stopped(ndev) && !net_device->start_remove && 490 (hv_ringbuf_avail_percent(&device->channel->outbound) 491 > RING_AVAIL_PERCENT_HIWATER || 492 num_outstanding_sends < 1)) 493 netif_wake_queue(ndev); 494 } else { 495 netdev_err(ndev, "Unknown send completion packet type- " 496 "%d received!!\n", nvsp_packet->hdr.msg_type); 497 } 498 499 } 500 501 int netvsc_send(struct hv_device *device, 502 struct hv_netvsc_packet *packet) 503 { 504 struct netvsc_device *net_device; 505 int ret = 0; 506 struct nvsp_message sendMessage; 507 struct net_device *ndev; 508 509 net_device = get_outbound_net_device(device); 510 if (!net_device) 511 return -ENODEV; 512 ndev = net_device->ndev; 513 514 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 515 if (packet->is_data_pkt) { 516 /* 0 is RMC_DATA; */ 517 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; 518 } else { 519 /* 1 is RMC_CONTROL; */ 520 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; 521 } 522 523 /* Not using send buffer section */ 524 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 525 0xFFFFFFFF; 526 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 527 528 if (packet->page_buf_cnt) { 529 ret = vmbus_sendpacket_pagebuffer(device->channel, 530 packet->page_buf, 531 packet->page_buf_cnt, 532 &sendMessage, 533 sizeof(struct nvsp_message), 534 (unsigned long)packet); 535 } else { 536 ret = vmbus_sendpacket(device->channel, &sendMessage, 537 sizeof(struct nvsp_message), 538 (unsigned long)packet, 539 VM_PKT_DATA_INBAND, 540 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 541 542 } 543 544 if (ret == 0) { 545 atomic_inc(&net_device->num_outstanding_sends); 546 if (hv_ringbuf_avail_percent(&device->channel->outbound) < 547 RING_AVAIL_PERCENT_LOWATER) { 548 netif_stop_queue(ndev); 549 if (atomic_read(&net_device-> 550 num_outstanding_sends) < 1) 551 netif_wake_queue(ndev); 552 } 553 } else if (ret == -EAGAIN) { 554 netif_stop_queue(ndev); 555 if (atomic_read(&net_device->num_outstanding_sends) < 1) { 556 netif_wake_queue(ndev); 557 ret = -ENOSPC; 558 } 559 } else { 560 netdev_err(ndev, "Unable to send packet %p ret %d\n", 561 packet, ret); 562 } 563 564 return ret; 565 } 566 567 static void netvsc_send_recv_completion(struct hv_device *device, 568 u64 transaction_id) 569 { 570 struct nvsp_message recvcompMessage; 571 int retries = 0; 572 int ret; 573 struct net_device *ndev; 574 struct netvsc_device *net_device = hv_get_drvdata(device); 575 576 ndev = net_device->ndev; 577 578 recvcompMessage.hdr.msg_type = 579 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 580 581 /* FIXME: Pass in the status */ 582 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = 583 NVSP_STAT_SUCCESS; 584 585 retry_send_cmplt: 586 /* Send the completion */ 587 ret = vmbus_sendpacket(device->channel, &recvcompMessage, 588 sizeof(struct nvsp_message), transaction_id, 589 VM_PKT_COMP, 0); 590 if (ret == 0) { 591 /* success */ 592 /* no-op */ 593 } else if (ret == -EAGAIN) { 594 /* no more room...wait a bit and attempt to retry 3 times */ 595 retries++; 596 netdev_err(ndev, "unable to send receive completion pkt" 597 " (tid %llx)...retrying %d\n", transaction_id, retries); 598 599 if (retries < 4) { 600 udelay(100); 601 goto retry_send_cmplt; 602 } else { 603 netdev_err(ndev, "unable to send receive " 604 "completion pkt (tid %llx)...give up retrying\n", 605 transaction_id); 606 } 607 } else { 608 netdev_err(ndev, "unable to send receive " 609 "completion pkt - %llx\n", transaction_id); 610 } 611 } 612 613 /* Send a receive completion packet to RNDIS device (ie NetVsp) */ 614 static void netvsc_receive_completion(void *context) 615 { 616 struct hv_netvsc_packet *packet = context; 617 struct hv_device *device = (struct hv_device *)packet->device; 618 struct netvsc_device *net_device; 619 u64 transaction_id = 0; 620 bool fsend_receive_comp = false; 621 unsigned long flags; 622 struct net_device *ndev; 623 624 /* 625 * Even though it seems logical to do a GetOutboundNetDevice() here to 626 * send out receive completion, we are using GetInboundNetDevice() 627 * since we may have disable outbound traffic already. 628 */ 629 net_device = get_inbound_net_device(device); 630 if (!net_device) 631 return; 632 ndev = net_device->ndev; 633 634 /* Overloading use of the lock. */ 635 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 636 637 packet->xfer_page_pkt->count--; 638 639 /* 640 * Last one in the line that represent 1 xfer page packet. 641 * Return the xfer page packet itself to the freelist 642 */ 643 if (packet->xfer_page_pkt->count == 0) { 644 fsend_receive_comp = true; 645 transaction_id = packet->completion.recv.recv_completion_tid; 646 list_add_tail(&packet->xfer_page_pkt->list_ent, 647 &net_device->recv_pkt_list); 648 649 } 650 651 /* Put the packet back */ 652 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); 653 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 654 655 /* Send a receive completion for the xfer page packet */ 656 if (fsend_receive_comp) 657 netvsc_send_recv_completion(device, transaction_id); 658 659 } 660 661 static void netvsc_receive(struct hv_device *device, 662 struct vmpacket_descriptor *packet) 663 { 664 struct netvsc_device *net_device; 665 struct vmtransfer_page_packet_header *vmxferpage_packet; 666 struct nvsp_message *nvsp_packet; 667 struct hv_netvsc_packet *netvsc_packet = NULL; 668 /* struct netvsc_driver *netvscDriver; */ 669 struct xferpage_packet *xferpage_packet = NULL; 670 int i; 671 int count = 0; 672 unsigned long flags; 673 struct net_device *ndev; 674 675 LIST_HEAD(listHead); 676 677 net_device = get_inbound_net_device(device); 678 if (!net_device) 679 return; 680 ndev = net_device->ndev; 681 682 /* 683 * All inbound packets other than send completion should be xfer page 684 * packet 685 */ 686 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 687 netdev_err(ndev, "Unknown packet type received - %d\n", 688 packet->type); 689 return; 690 } 691 692 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 693 (packet->offset8 << 3)); 694 695 /* Make sure this is a valid nvsp packet */ 696 if (nvsp_packet->hdr.msg_type != 697 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 698 netdev_err(ndev, "Unknown nvsp packet type received-" 699 " %d\n", nvsp_packet->hdr.msg_type); 700 return; 701 } 702 703 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 704 705 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 706 netdev_err(ndev, "Invalid xfer page set id - " 707 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 708 vmxferpage_packet->xfer_pageset_id); 709 return; 710 } 711 712 /* 713 * Grab free packets (range count + 1) to represent this xfer 714 * page packet. +1 to represent the xfer page packet itself. 715 * We grab it here so that we know exactly how many we can 716 * fulfil 717 */ 718 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 719 while (!list_empty(&net_device->recv_pkt_list)) { 720 list_move_tail(net_device->recv_pkt_list.next, &listHead); 721 if (++count == vmxferpage_packet->range_cnt + 1) 722 break; 723 } 724 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 725 726 /* 727 * We need at least 2 netvsc pkts (1 to represent the xfer 728 * page and at least 1 for the range) i.e. we can handled 729 * some of the xfer page packet ranges... 730 */ 731 if (count < 2) { 732 netdev_err(ndev, "Got only %d netvsc pkt...needed " 733 "%d pkts. Dropping this xfer page packet completely!\n", 734 count, vmxferpage_packet->range_cnt + 1); 735 736 /* Return it to the freelist */ 737 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 738 for (i = count; i != 0; i--) { 739 list_move_tail(listHead.next, 740 &net_device->recv_pkt_list); 741 } 742 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, 743 flags); 744 745 netvsc_send_recv_completion(device, 746 vmxferpage_packet->d.trans_id); 747 748 return; 749 } 750 751 /* Remove the 1st packet to represent the xfer page packet itself */ 752 xferpage_packet = (struct xferpage_packet *)listHead.next; 753 list_del(&xferpage_packet->list_ent); 754 755 /* This is how much we can satisfy */ 756 xferpage_packet->count = count - 1; 757 758 if (xferpage_packet->count != vmxferpage_packet->range_cnt) { 759 netdev_err(ndev, "Needed %d netvsc pkts to satisfy " 760 "this xfer page...got %d\n", 761 vmxferpage_packet->range_cnt, xferpage_packet->count); 762 } 763 764 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 765 for (i = 0; i < (count - 1); i++) { 766 netvsc_packet = (struct hv_netvsc_packet *)listHead.next; 767 list_del(&netvsc_packet->list_ent); 768 769 /* Initialize the netvsc packet */ 770 netvsc_packet->xfer_page_pkt = xferpage_packet; 771 netvsc_packet->completion.recv.recv_completion = 772 netvsc_receive_completion; 773 netvsc_packet->completion.recv.recv_completion_ctx = 774 netvsc_packet; 775 netvsc_packet->device = device; 776 /* Save this so that we can send it back */ 777 netvsc_packet->completion.recv.recv_completion_tid = 778 vmxferpage_packet->d.trans_id; 779 780 netvsc_packet->data = (void *)((unsigned long)net_device-> 781 recv_buf + vmxferpage_packet->ranges[i].byte_offset); 782 netvsc_packet->total_data_buflen = 783 vmxferpage_packet->ranges[i].byte_count; 784 785 /* Pass it to the upper layer */ 786 rndis_filter_receive(device, netvsc_packet); 787 788 netvsc_receive_completion(netvsc_packet-> 789 completion.recv.recv_completion_ctx); 790 } 791 792 } 793 794 static void netvsc_channel_cb(void *context) 795 { 796 int ret; 797 struct hv_device *device = context; 798 struct netvsc_device *net_device; 799 u32 bytes_recvd; 800 u64 request_id; 801 unsigned char *packet; 802 struct vmpacket_descriptor *desc; 803 unsigned char *buffer; 804 int bufferlen = NETVSC_PACKET_SIZE; 805 struct net_device *ndev; 806 807 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), 808 GFP_ATOMIC); 809 if (!packet) 810 return; 811 buffer = packet; 812 813 net_device = get_inbound_net_device(device); 814 if (!net_device) 815 goto out; 816 ndev = net_device->ndev; 817 818 do { 819 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, 820 &bytes_recvd, &request_id); 821 if (ret == 0) { 822 if (bytes_recvd > 0) { 823 desc = (struct vmpacket_descriptor *)buffer; 824 switch (desc->type) { 825 case VM_PKT_COMP: 826 netvsc_send_completion(device, desc); 827 break; 828 829 case VM_PKT_DATA_USING_XFER_PAGES: 830 netvsc_receive(device, desc); 831 break; 832 833 default: 834 netdev_err(ndev, 835 "unhandled packet type %d, " 836 "tid %llx len %d\n", 837 desc->type, request_id, 838 bytes_recvd); 839 break; 840 } 841 842 /* reset */ 843 if (bufferlen > NETVSC_PACKET_SIZE) { 844 kfree(buffer); 845 buffer = packet; 846 bufferlen = NETVSC_PACKET_SIZE; 847 } 848 } else { 849 /* reset */ 850 if (bufferlen > NETVSC_PACKET_SIZE) { 851 kfree(buffer); 852 buffer = packet; 853 bufferlen = NETVSC_PACKET_SIZE; 854 } 855 856 break; 857 } 858 } else if (ret == -ENOBUFS) { 859 /* Handle large packet */ 860 buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 861 if (buffer == NULL) { 862 /* Try again next time around */ 863 netdev_err(ndev, 864 "unable to allocate buffer of size " 865 "(%d)!!\n", bytes_recvd); 866 break; 867 } 868 869 bufferlen = bytes_recvd; 870 } 871 } while (1); 872 873 out: 874 kfree(buffer); 875 return; 876 } 877 878 /* 879 * netvsc_device_add - Callback when the device belonging to this 880 * driver is added 881 */ 882 int netvsc_device_add(struct hv_device *device, void *additional_info) 883 { 884 int ret = 0; 885 int i; 886 int ring_size = 887 ((struct netvsc_device_info *)additional_info)->ring_size; 888 struct netvsc_device *net_device; 889 struct hv_netvsc_packet *packet, *pos; 890 struct net_device *ndev; 891 892 net_device = alloc_net_device(device); 893 if (!net_device) { 894 ret = -ENOMEM; 895 goto cleanup; 896 } 897 898 /* 899 * Coming into this function, struct net_device * is 900 * registered as the driver private data. 901 * In alloc_net_device(), we register struct netvsc_device * 902 * as the driver private data and stash away struct net_device * 903 * in struct netvsc_device *. 904 */ 905 ndev = net_device->ndev; 906 907 /* Initialize the NetVSC channel extension */ 908 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 909 spin_lock_init(&net_device->recv_pkt_list_lock); 910 911 INIT_LIST_HEAD(&net_device->recv_pkt_list); 912 913 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { 914 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 915 (NETVSC_RECEIVE_SG_COUNT * 916 sizeof(struct hv_page_buffer)), GFP_KERNEL); 917 if (!packet) 918 break; 919 920 list_add_tail(&packet->list_ent, 921 &net_device->recv_pkt_list); 922 } 923 init_completion(&net_device->channel_init_wait); 924 925 /* Open the channel */ 926 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 927 ring_size * PAGE_SIZE, NULL, 0, 928 netvsc_channel_cb, device); 929 930 if (ret != 0) { 931 netdev_err(ndev, "unable to open channel: %d\n", ret); 932 goto cleanup; 933 } 934 935 /* Channel is opened */ 936 pr_info("hv_netvsc channel opened successfully\n"); 937 938 /* Connect with the NetVsp */ 939 ret = netvsc_connect_vsp(device); 940 if (ret != 0) { 941 netdev_err(ndev, 942 "unable to connect to NetVSP - %d\n", ret); 943 goto close; 944 } 945 946 return ret; 947 948 close: 949 /* Now, we can close the channel safely */ 950 vmbus_close(device->channel); 951 952 cleanup: 953 954 if (net_device) { 955 list_for_each_entry_safe(packet, pos, 956 &net_device->recv_pkt_list, 957 list_ent) { 958 list_del(&packet->list_ent); 959 kfree(packet); 960 } 961 962 kfree(net_device); 963 } 964 965 return ret; 966 } 967