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