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/kernel.h> 23 #include <linux/sched.h> 24 #include <linux/wait.h> 25 #include <linux/mm.h> 26 #include <linux/delay.h> 27 #include <linux/io.h> 28 #include <linux/slab.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_ether.h> 31 32 #include "hyperv_net.h" 33 34 35 static struct netvsc_device *alloc_net_device(struct hv_device *device) 36 { 37 struct netvsc_device *net_device; 38 struct net_device *ndev = hv_get_drvdata(device); 39 40 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 41 if (!net_device) 42 return NULL; 43 44 init_waitqueue_head(&net_device->wait_drain); 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); 385 386 netvsc_disconnect_vsp(net_device); 387 388 /* 389 * Since we have already drained, we don't need to busy wait 390 * as was done in final_release_stor_device() 391 * Note that we cannot set the ext pointer to NULL until 392 * we have drained - to drain the outgoing packets, we need to 393 * allow incoming packets. 394 */ 395 396 spin_lock_irqsave(&device->channel->inbound_lock, flags); 397 hv_set_drvdata(device, NULL); 398 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 399 400 /* 401 * At this point, no one should be accessing net_device 402 * except in here 403 */ 404 dev_notice(&device->device, "net device safe to remove\n"); 405 406 /* Now, we can close the channel safely */ 407 vmbus_close(device->channel); 408 409 /* Release all resources */ 410 list_for_each_entry_safe(netvsc_packet, pos, 411 &net_device->recv_pkt_list, list_ent) { 412 list_del(&netvsc_packet->list_ent); 413 kfree(netvsc_packet); 414 } 415 416 kfree(net_device); 417 return 0; 418 } 419 420 421 #define RING_AVAIL_PERCENT_HIWATER 20 422 #define RING_AVAIL_PERCENT_LOWATER 10 423 424 /* 425 * Get the percentage of available bytes to write in the ring. 426 * The return value is in range from 0 to 100. 427 */ 428 static inline u32 hv_ringbuf_avail_percent( 429 struct hv_ring_buffer_info *ring_info) 430 { 431 u32 avail_read, avail_write; 432 433 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 434 435 return avail_write * 100 / ring_info->ring_datasize; 436 } 437 438 static void netvsc_send_completion(struct hv_device *device, 439 struct vmpacket_descriptor *packet) 440 { 441 struct netvsc_device *net_device; 442 struct nvsp_message *nvsp_packet; 443 struct hv_netvsc_packet *nvsc_packet; 444 struct net_device *ndev; 445 446 net_device = get_inbound_net_device(device); 447 if (!net_device) 448 return; 449 ndev = net_device->ndev; 450 451 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 452 (packet->offset8 << 3)); 453 454 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 455 (nvsp_packet->hdr.msg_type == 456 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 457 (nvsp_packet->hdr.msg_type == 458 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 459 /* Copy the response back */ 460 memcpy(&net_device->channel_init_pkt, nvsp_packet, 461 sizeof(struct nvsp_message)); 462 complete(&net_device->channel_init_wait); 463 } else if (nvsp_packet->hdr.msg_type == 464 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 465 int num_outstanding_sends; 466 467 /* Get the send context */ 468 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 469 packet->trans_id; 470 471 /* Notify the layer above us */ 472 if (nvsc_packet) 473 nvsc_packet->completion.send.send_completion( 474 nvsc_packet->completion.send. 475 send_completion_ctx); 476 477 num_outstanding_sends = 478 atomic_dec_return(&net_device->num_outstanding_sends); 479 480 if (net_device->destroy && num_outstanding_sends == 0) 481 wake_up(&net_device->wait_drain); 482 483 if (netif_queue_stopped(ndev) && !net_device->start_remove && 484 (hv_ringbuf_avail_percent(&device->channel->outbound) 485 > RING_AVAIL_PERCENT_HIWATER || 486 num_outstanding_sends < 1)) 487 netif_wake_queue(ndev); 488 } else { 489 netdev_err(ndev, "Unknown send completion packet type- " 490 "%d received!!\n", nvsp_packet->hdr.msg_type); 491 } 492 493 } 494 495 int netvsc_send(struct hv_device *device, 496 struct hv_netvsc_packet *packet) 497 { 498 struct netvsc_device *net_device; 499 int ret = 0; 500 struct nvsp_message sendMessage; 501 struct net_device *ndev; 502 u64 req_id; 503 504 net_device = get_outbound_net_device(device); 505 if (!net_device) 506 return -ENODEV; 507 ndev = net_device->ndev; 508 509 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 510 if (packet->is_data_pkt) { 511 /* 0 is RMC_DATA; */ 512 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; 513 } else { 514 /* 1 is RMC_CONTROL; */ 515 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; 516 } 517 518 /* Not using send buffer section */ 519 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 520 0xFFFFFFFF; 521 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 522 523 if (packet->completion.send.send_completion) 524 req_id = (ulong)packet; 525 else 526 req_id = 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 req_id); 535 } else { 536 ret = vmbus_sendpacket(device->channel, &sendMessage, 537 sizeof(struct nvsp_message), 538 req_id, 539 VM_PKT_DATA_INBAND, 540 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 541 } 542 543 if (ret == 0) { 544 atomic_inc(&net_device->num_outstanding_sends); 545 if (hv_ringbuf_avail_percent(&device->channel->outbound) < 546 RING_AVAIL_PERCENT_LOWATER) { 547 netif_stop_queue(ndev); 548 if (atomic_read(&net_device-> 549 num_outstanding_sends) < 1) 550 netif_wake_queue(ndev); 551 } 552 } else if (ret == -EAGAIN) { 553 netif_stop_queue(ndev); 554 if (atomic_read(&net_device->num_outstanding_sends) < 1) { 555 netif_wake_queue(ndev); 556 ret = -ENOSPC; 557 } 558 } else { 559 netdev_err(ndev, "Unable to send packet %p ret %d\n", 560 packet, ret); 561 } 562 563 return ret; 564 } 565 566 static void netvsc_send_recv_completion(struct hv_device *device, 567 u64 transaction_id, u32 status) 568 { 569 struct nvsp_message recvcompMessage; 570 int retries = 0; 571 int ret; 572 struct net_device *ndev; 573 struct netvsc_device *net_device = hv_get_drvdata(device); 574 575 ndev = net_device->ndev; 576 577 recvcompMessage.hdr.msg_type = 578 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 579 580 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 581 582 retry_send_cmplt: 583 /* Send the completion */ 584 ret = vmbus_sendpacket(device->channel, &recvcompMessage, 585 sizeof(struct nvsp_message), transaction_id, 586 VM_PKT_COMP, 0); 587 if (ret == 0) { 588 /* success */ 589 /* no-op */ 590 } else if (ret == -EAGAIN) { 591 /* no more room...wait a bit and attempt to retry 3 times */ 592 retries++; 593 netdev_err(ndev, "unable to send receive completion pkt" 594 " (tid %llx)...retrying %d\n", transaction_id, retries); 595 596 if (retries < 4) { 597 udelay(100); 598 goto retry_send_cmplt; 599 } else { 600 netdev_err(ndev, "unable to send receive " 601 "completion pkt (tid %llx)...give up retrying\n", 602 transaction_id); 603 } 604 } else { 605 netdev_err(ndev, "unable to send receive " 606 "completion pkt - %llx\n", transaction_id); 607 } 608 } 609 610 /* Send a receive completion packet to RNDIS device (ie NetVsp) */ 611 static void netvsc_receive_completion(void *context) 612 { 613 struct hv_netvsc_packet *packet = context; 614 struct hv_device *device = packet->device; 615 struct netvsc_device *net_device; 616 u64 transaction_id = 0; 617 bool fsend_receive_comp = false; 618 unsigned long flags; 619 struct net_device *ndev; 620 u32 status = NVSP_STAT_NONE; 621 622 /* 623 * Even though it seems logical to do a GetOutboundNetDevice() here to 624 * send out receive completion, we are using GetInboundNetDevice() 625 * since we may have disable outbound traffic already. 626 */ 627 net_device = get_inbound_net_device(device); 628 if (!net_device) 629 return; 630 ndev = net_device->ndev; 631 632 /* Overloading use of the lock. */ 633 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 634 635 if (packet->status != NVSP_STAT_SUCCESS) 636 packet->xfer_page_pkt->status = NVSP_STAT_FAIL; 637 638 packet->xfer_page_pkt->count--; 639 640 /* 641 * Last one in the line that represent 1 xfer page packet. 642 * Return the xfer page packet itself to the freelist 643 */ 644 if (packet->xfer_page_pkt->count == 0) { 645 fsend_receive_comp = true; 646 transaction_id = packet->completion.recv.recv_completion_tid; 647 status = packet->xfer_page_pkt->status; 648 list_add_tail(&packet->xfer_page_pkt->list_ent, 649 &net_device->recv_pkt_list); 650 651 } 652 653 /* Put the packet back */ 654 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); 655 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 656 657 /* Send a receive completion for the xfer page packet */ 658 if (fsend_receive_comp) 659 netvsc_send_recv_completion(device, transaction_id, status); 660 661 } 662 663 static void netvsc_receive(struct hv_device *device, 664 struct vmpacket_descriptor *packet) 665 { 666 struct netvsc_device *net_device; 667 struct vmtransfer_page_packet_header *vmxferpage_packet; 668 struct nvsp_message *nvsp_packet; 669 struct hv_netvsc_packet *netvsc_packet = NULL; 670 /* struct netvsc_driver *netvscDriver; */ 671 struct xferpage_packet *xferpage_packet = NULL; 672 int i; 673 int count = 0; 674 unsigned long flags; 675 struct net_device *ndev; 676 677 LIST_HEAD(listHead); 678 679 net_device = get_inbound_net_device(device); 680 if (!net_device) 681 return; 682 ndev = net_device->ndev; 683 684 /* 685 * All inbound packets other than send completion should be xfer page 686 * packet 687 */ 688 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 689 netdev_err(ndev, "Unknown packet type received - %d\n", 690 packet->type); 691 return; 692 } 693 694 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 695 (packet->offset8 << 3)); 696 697 /* Make sure this is a valid nvsp packet */ 698 if (nvsp_packet->hdr.msg_type != 699 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 700 netdev_err(ndev, "Unknown nvsp packet type received-" 701 " %d\n", nvsp_packet->hdr.msg_type); 702 return; 703 } 704 705 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 706 707 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 708 netdev_err(ndev, "Invalid xfer page set id - " 709 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 710 vmxferpage_packet->xfer_pageset_id); 711 return; 712 } 713 714 /* 715 * Grab free packets (range count + 1) to represent this xfer 716 * page packet. +1 to represent the xfer page packet itself. 717 * We grab it here so that we know exactly how many we can 718 * fulfil 719 */ 720 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 721 while (!list_empty(&net_device->recv_pkt_list)) { 722 list_move_tail(net_device->recv_pkt_list.next, &listHead); 723 if (++count == vmxferpage_packet->range_cnt + 1) 724 break; 725 } 726 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 727 728 /* 729 * We need at least 2 netvsc pkts (1 to represent the xfer 730 * page and at least 1 for the range) i.e. we can handled 731 * some of the xfer page packet ranges... 732 */ 733 if (count < 2) { 734 netdev_err(ndev, "Got only %d netvsc pkt...needed " 735 "%d pkts. Dropping this xfer page packet completely!\n", 736 count, vmxferpage_packet->range_cnt + 1); 737 738 /* Return it to the freelist */ 739 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 740 for (i = count; i != 0; i--) { 741 list_move_tail(listHead.next, 742 &net_device->recv_pkt_list); 743 } 744 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, 745 flags); 746 747 netvsc_send_recv_completion(device, 748 vmxferpage_packet->d.trans_id, 749 NVSP_STAT_FAIL); 750 751 return; 752 } 753 754 /* Remove the 1st packet to represent the xfer page packet itself */ 755 xferpage_packet = (struct xferpage_packet *)listHead.next; 756 list_del(&xferpage_packet->list_ent); 757 xferpage_packet->status = NVSP_STAT_SUCCESS; 758 759 /* This is how much we can satisfy */ 760 xferpage_packet->count = count - 1; 761 762 if (xferpage_packet->count != vmxferpage_packet->range_cnt) { 763 netdev_err(ndev, "Needed %d netvsc pkts to satisfy " 764 "this xfer page...got %d\n", 765 vmxferpage_packet->range_cnt, xferpage_packet->count); 766 } 767 768 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 769 for (i = 0; i < (count - 1); i++) { 770 netvsc_packet = (struct hv_netvsc_packet *)listHead.next; 771 list_del(&netvsc_packet->list_ent); 772 773 /* Initialize the netvsc packet */ 774 netvsc_packet->status = NVSP_STAT_SUCCESS; 775 netvsc_packet->xfer_page_pkt = xferpage_packet; 776 netvsc_packet->completion.recv.recv_completion = 777 netvsc_receive_completion; 778 netvsc_packet->completion.recv.recv_completion_ctx = 779 netvsc_packet; 780 netvsc_packet->device = device; 781 /* Save this so that we can send it back */ 782 netvsc_packet->completion.recv.recv_completion_tid = 783 vmxferpage_packet->d.trans_id; 784 785 netvsc_packet->data = (void *)((unsigned long)net_device-> 786 recv_buf + vmxferpage_packet->ranges[i].byte_offset); 787 netvsc_packet->total_data_buflen = 788 vmxferpage_packet->ranges[i].byte_count; 789 790 /* Pass it to the upper layer */ 791 rndis_filter_receive(device, netvsc_packet); 792 793 netvsc_receive_completion(netvsc_packet-> 794 completion.recv.recv_completion_ctx); 795 } 796 797 } 798 799 static void netvsc_channel_cb(void *context) 800 { 801 int ret; 802 struct hv_device *device = context; 803 struct netvsc_device *net_device; 804 u32 bytes_recvd; 805 u64 request_id; 806 unsigned char *packet; 807 struct vmpacket_descriptor *desc; 808 unsigned char *buffer; 809 int bufferlen = NETVSC_PACKET_SIZE; 810 struct net_device *ndev; 811 812 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), 813 GFP_ATOMIC); 814 if (!packet) 815 return; 816 buffer = packet; 817 818 net_device = get_inbound_net_device(device); 819 if (!net_device) 820 goto out; 821 ndev = net_device->ndev; 822 823 do { 824 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, 825 &bytes_recvd, &request_id); 826 if (ret == 0) { 827 if (bytes_recvd > 0) { 828 desc = (struct vmpacket_descriptor *)buffer; 829 switch (desc->type) { 830 case VM_PKT_COMP: 831 netvsc_send_completion(device, desc); 832 break; 833 834 case VM_PKT_DATA_USING_XFER_PAGES: 835 netvsc_receive(device, desc); 836 break; 837 838 default: 839 netdev_err(ndev, 840 "unhandled packet type %d, " 841 "tid %llx len %d\n", 842 desc->type, request_id, 843 bytes_recvd); 844 break; 845 } 846 847 /* reset */ 848 if (bufferlen > NETVSC_PACKET_SIZE) { 849 kfree(buffer); 850 buffer = packet; 851 bufferlen = NETVSC_PACKET_SIZE; 852 } 853 } else { 854 /* reset */ 855 if (bufferlen > NETVSC_PACKET_SIZE) { 856 kfree(buffer); 857 buffer = packet; 858 bufferlen = NETVSC_PACKET_SIZE; 859 } 860 861 break; 862 } 863 } else if (ret == -ENOBUFS) { 864 /* Handle large packet */ 865 buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 866 if (buffer == NULL) { 867 /* Try again next time around */ 868 netdev_err(ndev, 869 "unable to allocate buffer of size " 870 "(%d)!!\n", bytes_recvd); 871 break; 872 } 873 874 bufferlen = bytes_recvd; 875 } 876 } while (1); 877 878 out: 879 kfree(buffer); 880 return; 881 } 882 883 /* 884 * netvsc_device_add - Callback when the device belonging to this 885 * driver is added 886 */ 887 int netvsc_device_add(struct hv_device *device, void *additional_info) 888 { 889 int ret = 0; 890 int i; 891 int ring_size = 892 ((struct netvsc_device_info *)additional_info)->ring_size; 893 struct netvsc_device *net_device; 894 struct hv_netvsc_packet *packet, *pos; 895 struct net_device *ndev; 896 897 net_device = alloc_net_device(device); 898 if (!net_device) { 899 ret = -ENOMEM; 900 goto cleanup; 901 } 902 903 /* 904 * Coming into this function, struct net_device * is 905 * registered as the driver private data. 906 * In alloc_net_device(), we register struct netvsc_device * 907 * as the driver private data and stash away struct net_device * 908 * in struct netvsc_device *. 909 */ 910 ndev = net_device->ndev; 911 912 /* Initialize the NetVSC channel extension */ 913 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 914 spin_lock_init(&net_device->recv_pkt_list_lock); 915 916 INIT_LIST_HEAD(&net_device->recv_pkt_list); 917 918 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { 919 packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL); 920 if (!packet) 921 break; 922 923 list_add_tail(&packet->list_ent, 924 &net_device->recv_pkt_list); 925 } 926 init_completion(&net_device->channel_init_wait); 927 928 /* Open the channel */ 929 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 930 ring_size * PAGE_SIZE, NULL, 0, 931 netvsc_channel_cb, device); 932 933 if (ret != 0) { 934 netdev_err(ndev, "unable to open channel: %d\n", ret); 935 goto cleanup; 936 } 937 938 /* Channel is opened */ 939 pr_info("hv_netvsc channel opened successfully\n"); 940 941 /* Connect with the NetVsp */ 942 ret = netvsc_connect_vsp(device); 943 if (ret != 0) { 944 netdev_err(ndev, 945 "unable to connect to NetVSP - %d\n", ret); 946 goto close; 947 } 948 949 return ret; 950 951 close: 952 /* Now, we can close the channel safely */ 953 vmbus_close(device->channel); 954 955 cleanup: 956 957 if (net_device) { 958 list_for_each_entry_safe(packet, pos, 959 &net_device->recv_pkt_list, 960 list_ent) { 961 list_del(&packet->list_ent); 962 kfree(packet); 963 } 964 965 kfree(net_device); 966 } 967 968 return ret; 969 } 970