1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 15 * Place - Suite 330, Boston, MA 02111-1307 USA. 16 * 17 * Authors: 18 * Haiyang Zhang <haiyangz@microsoft.com> 19 * Hank Janssen <hjanssen@microsoft.com> 20 */ 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 22 23 #include <linux/kernel.h> 24 #include <linux/sched.h> 25 #include <linux/wait.h> 26 #include <linux/mm.h> 27 #include <linux/delay.h> 28 #include <linux/io.h> 29 #include <linux/slab.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_ether.h> 32 33 #include "hyperv_net.h" 34 35 36 static struct netvsc_device *alloc_net_device(struct hv_device *device) 37 { 38 struct netvsc_device *net_device; 39 struct net_device *ndev = hv_get_drvdata(device); 40 41 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 42 if (!net_device) 43 return NULL; 44 45 init_waitqueue_head(&net_device->wait_drain); 46 net_device->start_remove = false; 47 net_device->destroy = false; 48 net_device->dev = device; 49 net_device->ndev = ndev; 50 51 hv_set_drvdata(device, net_device); 52 return net_device; 53 } 54 55 static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 56 { 57 struct netvsc_device *net_device; 58 59 net_device = hv_get_drvdata(device); 60 if (net_device && net_device->destroy) 61 net_device = NULL; 62 63 return net_device; 64 } 65 66 static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 67 { 68 struct netvsc_device *net_device; 69 70 net_device = hv_get_drvdata(device); 71 72 if (!net_device) 73 goto get_in_err; 74 75 if (net_device->destroy && 76 atomic_read(&net_device->num_outstanding_sends) == 0) 77 net_device = NULL; 78 79 get_in_err: 80 return net_device; 81 } 82 83 84 static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) 85 { 86 struct nvsp_message *revoke_packet; 87 int ret = 0; 88 struct net_device *ndev = net_device->ndev; 89 90 /* 91 * If we got a section count, it means we received a 92 * SendReceiveBufferComplete msg (ie sent 93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 94 * to send a revoke msg here 95 */ 96 if (net_device->recv_section_cnt) { 97 /* Send the revoke receive buffer */ 98 revoke_packet = &net_device->revoke_packet; 99 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 100 101 revoke_packet->hdr.msg_type = 102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 103 revoke_packet->msg.v1_msg. 104 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 105 106 ret = vmbus_sendpacket(net_device->dev->channel, 107 revoke_packet, 108 sizeof(struct nvsp_message), 109 (unsigned long)revoke_packet, 110 VM_PKT_DATA_INBAND, 0); 111 /* 112 * If we failed here, we might as well return and 113 * have a leak rather than continue and a bugchk 114 */ 115 if (ret != 0) { 116 netdev_err(ndev, "unable to send " 117 "revoke receive buffer to netvsp\n"); 118 return ret; 119 } 120 } 121 122 /* Teardown the gpadl on the vsp end */ 123 if (net_device->recv_buf_gpadl_handle) { 124 ret = vmbus_teardown_gpadl(net_device->dev->channel, 125 net_device->recv_buf_gpadl_handle); 126 127 /* If we failed here, we might as well return and have a leak 128 * rather than continue and a bugchk 129 */ 130 if (ret != 0) { 131 netdev_err(ndev, 132 "unable to teardown receive buffer's gpadl\n"); 133 return ret; 134 } 135 net_device->recv_buf_gpadl_handle = 0; 136 } 137 138 if (net_device->recv_buf) { 139 /* Free up the receive buffer */ 140 free_pages((unsigned long)net_device->recv_buf, 141 get_order(net_device->recv_buf_size)); 142 net_device->recv_buf = NULL; 143 } 144 145 if (net_device->recv_section) { 146 net_device->recv_section_cnt = 0; 147 kfree(net_device->recv_section); 148 net_device->recv_section = NULL; 149 } 150 151 return ret; 152 } 153 154 static int netvsc_init_recv_buf(struct hv_device *device) 155 { 156 int ret = 0; 157 int t; 158 struct netvsc_device *net_device; 159 struct nvsp_message *init_packet; 160 struct net_device *ndev; 161 162 net_device = get_outbound_net_device(device); 163 if (!net_device) 164 return -ENODEV; 165 ndev = net_device->ndev; 166 167 net_device->recv_buf = 168 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 169 get_order(net_device->recv_buf_size)); 170 if (!net_device->recv_buf) { 171 netdev_err(ndev, "unable to allocate receive " 172 "buffer of size %d\n", net_device->recv_buf_size); 173 ret = -ENOMEM; 174 goto cleanup; 175 } 176 177 /* 178 * Establish the gpadl handle for this buffer on this 179 * channel. Note: This call uses the vmbus connection rather 180 * than the channel to establish the gpadl handle. 181 */ 182 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 183 net_device->recv_buf_size, 184 &net_device->recv_buf_gpadl_handle); 185 if (ret != 0) { 186 netdev_err(ndev, 187 "unable to establish receive buffer's gpadl\n"); 188 goto cleanup; 189 } 190 191 192 /* Notify the NetVsp of the gpadl handle */ 193 init_packet = &net_device->channel_init_pkt; 194 195 memset(init_packet, 0, sizeof(struct nvsp_message)); 196 197 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 198 init_packet->msg.v1_msg.send_recv_buf. 199 gpadl_handle = net_device->recv_buf_gpadl_handle; 200 init_packet->msg.v1_msg. 201 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 202 203 /* Send the gpadl notification request */ 204 ret = vmbus_sendpacket(device->channel, init_packet, 205 sizeof(struct nvsp_message), 206 (unsigned long)init_packet, 207 VM_PKT_DATA_INBAND, 208 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 209 if (ret != 0) { 210 netdev_err(ndev, 211 "unable to send receive buffer's gpadl to netvsp\n"); 212 goto cleanup; 213 } 214 215 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 216 BUG_ON(t == 0); 217 218 219 /* Check the response */ 220 if (init_packet->msg.v1_msg. 221 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 222 netdev_err(ndev, "Unable to complete receive buffer " 223 "initialization with NetVsp - status %d\n", 224 init_packet->msg.v1_msg. 225 send_recv_buf_complete.status); 226 ret = -EINVAL; 227 goto cleanup; 228 } 229 230 /* Parse the response */ 231 232 net_device->recv_section_cnt = init_packet->msg. 233 v1_msg.send_recv_buf_complete.num_sections; 234 235 net_device->recv_section = kmemdup( 236 init_packet->msg.v1_msg.send_recv_buf_complete.sections, 237 net_device->recv_section_cnt * 238 sizeof(struct nvsp_1_receive_buffer_section), 239 GFP_KERNEL); 240 if (net_device->recv_section == NULL) { 241 ret = -EINVAL; 242 goto cleanup; 243 } 244 245 /* 246 * For 1st release, there should only be 1 section that represents the 247 * entire receive buffer 248 */ 249 if (net_device->recv_section_cnt != 1 || 250 net_device->recv_section->offset != 0) { 251 ret = -EINVAL; 252 goto cleanup; 253 } 254 255 goto exit; 256 257 cleanup: 258 netvsc_destroy_recv_buf(net_device); 259 260 exit: 261 return ret; 262 } 263 264 265 /* Negotiate NVSP protocol version */ 266 static int negotiate_nvsp_ver(struct hv_device *device, 267 struct netvsc_device *net_device, 268 struct nvsp_message *init_packet, 269 u32 nvsp_ver) 270 { 271 int ret, t; 272 273 memset(init_packet, 0, sizeof(struct nvsp_message)); 274 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 275 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 276 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 277 278 /* Send the init request */ 279 ret = vmbus_sendpacket(device->channel, init_packet, 280 sizeof(struct nvsp_message), 281 (unsigned long)init_packet, 282 VM_PKT_DATA_INBAND, 283 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 284 285 if (ret != 0) 286 return ret; 287 288 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 289 290 if (t == 0) 291 return -ETIMEDOUT; 292 293 if (init_packet->msg.init_msg.init_complete.status != 294 NVSP_STAT_SUCCESS) 295 return -EINVAL; 296 297 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2) 298 return 0; 299 300 /* NVSPv2 only: Send NDIS config */ 301 memset(init_packet, 0, sizeof(struct nvsp_message)); 302 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 303 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; 304 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 305 306 ret = vmbus_sendpacket(device->channel, init_packet, 307 sizeof(struct nvsp_message), 308 (unsigned long)init_packet, 309 VM_PKT_DATA_INBAND, 0); 310 311 return ret; 312 } 313 314 static int netvsc_connect_vsp(struct hv_device *device) 315 { 316 int ret; 317 struct netvsc_device *net_device; 318 struct nvsp_message *init_packet; 319 int ndis_version; 320 struct net_device *ndev; 321 322 net_device = get_outbound_net_device(device); 323 if (!net_device) 324 return -ENODEV; 325 ndev = net_device->ndev; 326 327 init_packet = &net_device->channel_init_pkt; 328 329 /* Negotiate the latest NVSP protocol supported */ 330 if (negotiate_nvsp_ver(device, net_device, init_packet, 331 NVSP_PROTOCOL_VERSION_2) == 0) { 332 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2; 333 } else if (negotiate_nvsp_ver(device, net_device, init_packet, 334 NVSP_PROTOCOL_VERSION_1) == 0) { 335 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1; 336 } else { 337 ret = -EPROTO; 338 goto cleanup; 339 } 340 341 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 342 343 /* Send the ndis version */ 344 memset(init_packet, 0, sizeof(struct nvsp_message)); 345 346 ndis_version = 0x00050001; 347 348 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 349 init_packet->msg.v1_msg. 350 send_ndis_ver.ndis_major_ver = 351 (ndis_version & 0xFFFF0000) >> 16; 352 init_packet->msg.v1_msg. 353 send_ndis_ver.ndis_minor_ver = 354 ndis_version & 0xFFFF; 355 356 /* Send the init request */ 357 ret = vmbus_sendpacket(device->channel, init_packet, 358 sizeof(struct nvsp_message), 359 (unsigned long)init_packet, 360 VM_PKT_DATA_INBAND, 0); 361 if (ret != 0) 362 goto cleanup; 363 364 /* Post the big receive buffer to NetVSP */ 365 ret = netvsc_init_recv_buf(device); 366 367 cleanup: 368 return ret; 369 } 370 371 static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 372 { 373 netvsc_destroy_recv_buf(net_device); 374 } 375 376 /* 377 * netvsc_device_remove - Callback when the root bus device is removed 378 */ 379 int netvsc_device_remove(struct hv_device *device) 380 { 381 struct netvsc_device *net_device; 382 struct hv_netvsc_packet *netvsc_packet, *pos; 383 unsigned long flags; 384 385 net_device = hv_get_drvdata(device); 386 387 netvsc_disconnect_vsp(net_device); 388 389 /* 390 * Since we have already drained, we don't need to busy wait 391 * as was done in final_release_stor_device() 392 * Note that we cannot set the ext pointer to NULL until 393 * we have drained - to drain the outgoing packets, we need to 394 * allow incoming packets. 395 */ 396 397 spin_lock_irqsave(&device->channel->inbound_lock, flags); 398 hv_set_drvdata(device, NULL); 399 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 400 401 /* 402 * At this point, no one should be accessing net_device 403 * except in here 404 */ 405 dev_notice(&device->device, "net device safe to remove\n"); 406 407 /* Now, we can close the channel safely */ 408 vmbus_close(device->channel); 409 410 /* Release all resources */ 411 list_for_each_entry_safe(netvsc_packet, pos, 412 &net_device->recv_pkt_list, list_ent) { 413 list_del(&netvsc_packet->list_ent); 414 kfree(netvsc_packet); 415 } 416 417 kfree(net_device); 418 return 0; 419 } 420 421 422 #define RING_AVAIL_PERCENT_HIWATER 20 423 #define RING_AVAIL_PERCENT_LOWATER 10 424 425 /* 426 * Get the percentage of available bytes to write in the ring. 427 * The return value is in range from 0 to 100. 428 */ 429 static inline u32 hv_ringbuf_avail_percent( 430 struct hv_ring_buffer_info *ring_info) 431 { 432 u32 avail_read, avail_write; 433 434 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 435 436 return avail_write * 100 / ring_info->ring_datasize; 437 } 438 439 static void netvsc_send_completion(struct hv_device *device, 440 struct vmpacket_descriptor *packet) 441 { 442 struct netvsc_device *net_device; 443 struct nvsp_message *nvsp_packet; 444 struct hv_netvsc_packet *nvsc_packet; 445 struct net_device *ndev; 446 447 net_device = get_inbound_net_device(device); 448 if (!net_device) 449 return; 450 ndev = net_device->ndev; 451 452 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 453 (packet->offset8 << 3)); 454 455 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 456 (nvsp_packet->hdr.msg_type == 457 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 458 (nvsp_packet->hdr.msg_type == 459 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 460 /* Copy the response back */ 461 memcpy(&net_device->channel_init_pkt, nvsp_packet, 462 sizeof(struct nvsp_message)); 463 complete(&net_device->channel_init_wait); 464 } else if (nvsp_packet->hdr.msg_type == 465 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 466 int num_outstanding_sends; 467 468 /* Get the send context */ 469 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 470 packet->trans_id; 471 472 /* Notify the layer above us */ 473 nvsc_packet->completion.send.send_completion( 474 nvsc_packet->completion.send.send_completion_ctx); 475 476 num_outstanding_sends = 477 atomic_dec_return(&net_device->num_outstanding_sends); 478 479 if (net_device->destroy && num_outstanding_sends == 0) 480 wake_up(&net_device->wait_drain); 481 482 if (netif_queue_stopped(ndev) && !net_device->start_remove && 483 (hv_ringbuf_avail_percent(&device->channel->outbound) 484 > RING_AVAIL_PERCENT_HIWATER || 485 num_outstanding_sends < 1)) 486 netif_wake_queue(ndev); 487 } else { 488 netdev_err(ndev, "Unknown send completion packet type- " 489 "%d received!!\n", nvsp_packet->hdr.msg_type); 490 } 491 492 } 493 494 int netvsc_send(struct hv_device *device, 495 struct hv_netvsc_packet *packet) 496 { 497 struct netvsc_device *net_device; 498 int ret = 0; 499 struct nvsp_message sendMessage; 500 struct net_device *ndev; 501 502 net_device = get_outbound_net_device(device); 503 if (!net_device) 504 return -ENODEV; 505 ndev = net_device->ndev; 506 507 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 508 if (packet->is_data_pkt) { 509 /* 0 is RMC_DATA; */ 510 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; 511 } else { 512 /* 1 is RMC_CONTROL; */ 513 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; 514 } 515 516 /* Not using send buffer section */ 517 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 518 0xFFFFFFFF; 519 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 520 521 if (packet->page_buf_cnt) { 522 ret = vmbus_sendpacket_pagebuffer(device->channel, 523 packet->page_buf, 524 packet->page_buf_cnt, 525 &sendMessage, 526 sizeof(struct nvsp_message), 527 (unsigned long)packet); 528 } else { 529 ret = vmbus_sendpacket(device->channel, &sendMessage, 530 sizeof(struct nvsp_message), 531 (unsigned long)packet, 532 VM_PKT_DATA_INBAND, 533 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 534 535 } 536 537 if (ret == 0) { 538 atomic_inc(&net_device->num_outstanding_sends); 539 if (hv_ringbuf_avail_percent(&device->channel->outbound) < 540 RING_AVAIL_PERCENT_LOWATER) { 541 netif_stop_queue(ndev); 542 if (atomic_read(&net_device-> 543 num_outstanding_sends) < 1) 544 netif_wake_queue(ndev); 545 } 546 } else if (ret == -EAGAIN) { 547 netif_stop_queue(ndev); 548 if (atomic_read(&net_device->num_outstanding_sends) < 1) { 549 netif_wake_queue(ndev); 550 ret = -ENOSPC; 551 } 552 } else { 553 netdev_err(ndev, "Unable to send packet %p ret %d\n", 554 packet, ret); 555 } 556 557 return ret; 558 } 559 560 static void netvsc_send_recv_completion(struct hv_device *device, 561 u64 transaction_id) 562 { 563 struct nvsp_message recvcompMessage; 564 int retries = 0; 565 int ret; 566 struct net_device *ndev; 567 struct netvsc_device *net_device = hv_get_drvdata(device); 568 569 ndev = net_device->ndev; 570 571 recvcompMessage.hdr.msg_type = 572 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 573 574 /* FIXME: Pass in the status */ 575 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = 576 NVSP_STAT_SUCCESS; 577 578 retry_send_cmplt: 579 /* Send the completion */ 580 ret = vmbus_sendpacket(device->channel, &recvcompMessage, 581 sizeof(struct nvsp_message), transaction_id, 582 VM_PKT_COMP, 0); 583 if (ret == 0) { 584 /* success */ 585 /* no-op */ 586 } else if (ret == -EAGAIN) { 587 /* no more room...wait a bit and attempt to retry 3 times */ 588 retries++; 589 netdev_err(ndev, "unable to send receive completion pkt" 590 " (tid %llx)...retrying %d\n", transaction_id, retries); 591 592 if (retries < 4) { 593 udelay(100); 594 goto retry_send_cmplt; 595 } else { 596 netdev_err(ndev, "unable to send receive " 597 "completion pkt (tid %llx)...give up retrying\n", 598 transaction_id); 599 } 600 } else { 601 netdev_err(ndev, "unable to send receive " 602 "completion pkt - %llx\n", transaction_id); 603 } 604 } 605 606 /* Send a receive completion packet to RNDIS device (ie NetVsp) */ 607 static void netvsc_receive_completion(void *context) 608 { 609 struct hv_netvsc_packet *packet = context; 610 struct hv_device *device = packet->device; 611 struct netvsc_device *net_device; 612 u64 transaction_id = 0; 613 bool fsend_receive_comp = false; 614 unsigned long flags; 615 struct net_device *ndev; 616 617 /* 618 * Even though it seems logical to do a GetOutboundNetDevice() here to 619 * send out receive completion, we are using GetInboundNetDevice() 620 * since we may have disable outbound traffic already. 621 */ 622 net_device = get_inbound_net_device(device); 623 if (!net_device) 624 return; 625 ndev = net_device->ndev; 626 627 /* Overloading use of the lock. */ 628 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 629 630 packet->xfer_page_pkt->count--; 631 632 /* 633 * Last one in the line that represent 1 xfer page packet. 634 * Return the xfer page packet itself to the freelist 635 */ 636 if (packet->xfer_page_pkt->count == 0) { 637 fsend_receive_comp = true; 638 transaction_id = packet->completion.recv.recv_completion_tid; 639 list_add_tail(&packet->xfer_page_pkt->list_ent, 640 &net_device->recv_pkt_list); 641 642 } 643 644 /* Put the packet back */ 645 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); 646 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 647 648 /* Send a receive completion for the xfer page packet */ 649 if (fsend_receive_comp) 650 netvsc_send_recv_completion(device, transaction_id); 651 652 } 653 654 static void netvsc_receive(struct hv_device *device, 655 struct vmpacket_descriptor *packet) 656 { 657 struct netvsc_device *net_device; 658 struct vmtransfer_page_packet_header *vmxferpage_packet; 659 struct nvsp_message *nvsp_packet; 660 struct hv_netvsc_packet *netvsc_packet = NULL; 661 /* struct netvsc_driver *netvscDriver; */ 662 struct xferpage_packet *xferpage_packet = NULL; 663 int i; 664 int count = 0; 665 unsigned long flags; 666 struct net_device *ndev; 667 668 LIST_HEAD(listHead); 669 670 net_device = get_inbound_net_device(device); 671 if (!net_device) 672 return; 673 ndev = net_device->ndev; 674 675 /* 676 * All inbound packets other than send completion should be xfer page 677 * packet 678 */ 679 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 680 netdev_err(ndev, "Unknown packet type received - %d\n", 681 packet->type); 682 return; 683 } 684 685 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 686 (packet->offset8 << 3)); 687 688 /* Make sure this is a valid nvsp packet */ 689 if (nvsp_packet->hdr.msg_type != 690 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 691 netdev_err(ndev, "Unknown nvsp packet type received-" 692 " %d\n", nvsp_packet->hdr.msg_type); 693 return; 694 } 695 696 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 697 698 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 699 netdev_err(ndev, "Invalid xfer page set id - " 700 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 701 vmxferpage_packet->xfer_pageset_id); 702 return; 703 } 704 705 /* 706 * Grab free packets (range count + 1) to represent this xfer 707 * page packet. +1 to represent the xfer page packet itself. 708 * We grab it here so that we know exactly how many we can 709 * fulfil 710 */ 711 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 712 while (!list_empty(&net_device->recv_pkt_list)) { 713 list_move_tail(net_device->recv_pkt_list.next, &listHead); 714 if (++count == vmxferpage_packet->range_cnt + 1) 715 break; 716 } 717 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 718 719 /* 720 * We need at least 2 netvsc pkts (1 to represent the xfer 721 * page and at least 1 for the range) i.e. we can handled 722 * some of the xfer page packet ranges... 723 */ 724 if (count < 2) { 725 netdev_err(ndev, "Got only %d netvsc pkt...needed " 726 "%d pkts. Dropping this xfer page packet completely!\n", 727 count, vmxferpage_packet->range_cnt + 1); 728 729 /* Return it to the freelist */ 730 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 731 for (i = count; i != 0; i--) { 732 list_move_tail(listHead.next, 733 &net_device->recv_pkt_list); 734 } 735 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, 736 flags); 737 738 netvsc_send_recv_completion(device, 739 vmxferpage_packet->d.trans_id); 740 741 return; 742 } 743 744 /* Remove the 1st packet to represent the xfer page packet itself */ 745 xferpage_packet = (struct xferpage_packet *)listHead.next; 746 list_del(&xferpage_packet->list_ent); 747 748 /* This is how much we can satisfy */ 749 xferpage_packet->count = count - 1; 750 751 if (xferpage_packet->count != vmxferpage_packet->range_cnt) { 752 netdev_err(ndev, "Needed %d netvsc pkts to satisfy " 753 "this xfer page...got %d\n", 754 vmxferpage_packet->range_cnt, xferpage_packet->count); 755 } 756 757 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 758 for (i = 0; i < (count - 1); i++) { 759 netvsc_packet = (struct hv_netvsc_packet *)listHead.next; 760 list_del(&netvsc_packet->list_ent); 761 762 /* Initialize the netvsc packet */ 763 netvsc_packet->xfer_page_pkt = xferpage_packet; 764 netvsc_packet->completion.recv.recv_completion = 765 netvsc_receive_completion; 766 netvsc_packet->completion.recv.recv_completion_ctx = 767 netvsc_packet; 768 netvsc_packet->device = device; 769 /* Save this so that we can send it back */ 770 netvsc_packet->completion.recv.recv_completion_tid = 771 vmxferpage_packet->d.trans_id; 772 773 netvsc_packet->data = (void *)((unsigned long)net_device-> 774 recv_buf + vmxferpage_packet->ranges[i].byte_offset); 775 netvsc_packet->total_data_buflen = 776 vmxferpage_packet->ranges[i].byte_count; 777 778 /* Pass it to the upper layer */ 779 rndis_filter_receive(device, netvsc_packet); 780 781 netvsc_receive_completion(netvsc_packet-> 782 completion.recv.recv_completion_ctx); 783 } 784 785 } 786 787 static void netvsc_channel_cb(void *context) 788 { 789 int ret; 790 struct hv_device *device = context; 791 struct netvsc_device *net_device; 792 u32 bytes_recvd; 793 u64 request_id; 794 unsigned char *packet; 795 struct vmpacket_descriptor *desc; 796 unsigned char *buffer; 797 int bufferlen = NETVSC_PACKET_SIZE; 798 struct net_device *ndev; 799 800 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), 801 GFP_ATOMIC); 802 if (!packet) 803 return; 804 buffer = packet; 805 806 net_device = get_inbound_net_device(device); 807 if (!net_device) 808 goto out; 809 ndev = net_device->ndev; 810 811 do { 812 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, 813 &bytes_recvd, &request_id); 814 if (ret == 0) { 815 if (bytes_recvd > 0) { 816 desc = (struct vmpacket_descriptor *)buffer; 817 switch (desc->type) { 818 case VM_PKT_COMP: 819 netvsc_send_completion(device, desc); 820 break; 821 822 case VM_PKT_DATA_USING_XFER_PAGES: 823 netvsc_receive(device, desc); 824 break; 825 826 default: 827 netdev_err(ndev, 828 "unhandled packet type %d, " 829 "tid %llx len %d\n", 830 desc->type, request_id, 831 bytes_recvd); 832 break; 833 } 834 835 /* reset */ 836 if (bufferlen > NETVSC_PACKET_SIZE) { 837 kfree(buffer); 838 buffer = packet; 839 bufferlen = NETVSC_PACKET_SIZE; 840 } 841 } else { 842 /* reset */ 843 if (bufferlen > NETVSC_PACKET_SIZE) { 844 kfree(buffer); 845 buffer = packet; 846 bufferlen = NETVSC_PACKET_SIZE; 847 } 848 849 break; 850 } 851 } else if (ret == -ENOBUFS) { 852 /* Handle large packet */ 853 buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 854 if (buffer == NULL) { 855 /* Try again next time around */ 856 netdev_err(ndev, 857 "unable to allocate buffer of size " 858 "(%d)!!\n", bytes_recvd); 859 break; 860 } 861 862 bufferlen = bytes_recvd; 863 } 864 } while (1); 865 866 out: 867 kfree(buffer); 868 return; 869 } 870 871 /* 872 * netvsc_device_add - Callback when the device belonging to this 873 * driver is added 874 */ 875 int netvsc_device_add(struct hv_device *device, void *additional_info) 876 { 877 int ret = 0; 878 int i; 879 int ring_size = 880 ((struct netvsc_device_info *)additional_info)->ring_size; 881 struct netvsc_device *net_device; 882 struct hv_netvsc_packet *packet, *pos; 883 struct net_device *ndev; 884 885 net_device = alloc_net_device(device); 886 if (!net_device) { 887 ret = -ENOMEM; 888 goto cleanup; 889 } 890 891 /* 892 * Coming into this function, struct net_device * is 893 * registered as the driver private data. 894 * In alloc_net_device(), we register struct netvsc_device * 895 * as the driver private data and stash away struct net_device * 896 * in struct netvsc_device *. 897 */ 898 ndev = net_device->ndev; 899 900 /* Initialize the NetVSC channel extension */ 901 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 902 spin_lock_init(&net_device->recv_pkt_list_lock); 903 904 INIT_LIST_HEAD(&net_device->recv_pkt_list); 905 906 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { 907 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 908 (NETVSC_RECEIVE_SG_COUNT * 909 sizeof(struct hv_page_buffer)), GFP_KERNEL); 910 if (!packet) 911 break; 912 913 list_add_tail(&packet->list_ent, 914 &net_device->recv_pkt_list); 915 } 916 init_completion(&net_device->channel_init_wait); 917 918 /* Open the channel */ 919 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 920 ring_size * PAGE_SIZE, NULL, 0, 921 netvsc_channel_cb, device); 922 923 if (ret != 0) { 924 netdev_err(ndev, "unable to open channel: %d\n", ret); 925 goto cleanup; 926 } 927 928 /* Channel is opened */ 929 pr_info("hv_netvsc channel opened successfully\n"); 930 931 /* Connect with the NetVsp */ 932 ret = netvsc_connect_vsp(device); 933 if (ret != 0) { 934 netdev_err(ndev, 935 "unable to connect to NetVSP - %d\n", ret); 936 goto close; 937 } 938 939 return ret; 940 941 close: 942 /* Now, we can close the channel safely */ 943 vmbus_close(device->channel); 944 945 cleanup: 946 947 if (net_device) { 948 list_for_each_entry_safe(packet, pos, 949 &net_device->recv_pkt_list, 950 list_ent) { 951 list_del(&packet->list_ent); 952 kfree(packet); 953 } 954 955 kfree(net_device); 956 } 957 958 return ret; 959 } 960