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 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 54 static 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 65 static 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 78 get_in_err: 79 return net_device; 80 } 81 82 83 static 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 } 152 153 static 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; 255 256 cleanup: 257 netvsc_destroy_recv_buf(net_device); 258 259 exit: 260 return ret; 261 } 262 263 264 /* Negotiate NVSP protocol version */ 265 static 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 } 312 313 static 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); 365 366 cleanup: 367 return ret; 368 } 369 370 static 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 */ 378 int 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 } 430 431 432 #define RING_AVAIL_PERCENT_HIWATER 20 433 #define RING_AVAIL_PERCENT_LOWATER 10 434 435 /* 436 * Get the percentage of available bytes to write in the ring. 437 * The return value is in range from 0 to 100. 438 */ 439 static inline u32 hv_ringbuf_avail_percent( 440 struct hv_ring_buffer_info *ring_info) 441 { 442 u32 avail_read, avail_write; 443 444 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 445 446 return avail_write * 100 / ring_info->ring_datasize; 447 } 448 449 static void netvsc_send_completion(struct hv_device *device, 450 struct vmpacket_descriptor *packet) 451 { 452 struct netvsc_device *net_device; 453 struct nvsp_message *nvsp_packet; 454 struct hv_netvsc_packet *nvsc_packet; 455 struct net_device *ndev; 456 457 net_device = get_inbound_net_device(device); 458 if (!net_device) 459 return; 460 ndev = net_device->ndev; 461 462 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 463 (packet->offset8 << 3)); 464 465 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 466 (nvsp_packet->hdr.msg_type == 467 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 468 (nvsp_packet->hdr.msg_type == 469 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 470 /* Copy the response back */ 471 memcpy(&net_device->channel_init_pkt, nvsp_packet, 472 sizeof(struct nvsp_message)); 473 complete(&net_device->channel_init_wait); 474 } else if (nvsp_packet->hdr.msg_type == 475 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 476 int num_outstanding_sends; 477 478 /* Get the send context */ 479 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 480 packet->trans_id; 481 482 /* Notify the layer above us */ 483 nvsc_packet->completion.send.send_completion( 484 nvsc_packet->completion.send.send_completion_ctx); 485 486 num_outstanding_sends = 487 atomic_dec_return(&net_device->num_outstanding_sends); 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