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