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 #include <linux/vmalloc.h> 32 #include <asm/sync_bitops.h> 33 34 #include "hyperv_net.h" 35 36 37 static struct netvsc_device *alloc_net_device(struct hv_device *device) 38 { 39 struct netvsc_device *net_device; 40 struct net_device *ndev = hv_get_drvdata(device); 41 42 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 43 if (!net_device) 44 return NULL; 45 46 net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL); 47 if (!net_device->cb_buffer) { 48 kfree(net_device); 49 return NULL; 50 } 51 52 init_waitqueue_head(&net_device->wait_drain); 53 net_device->start_remove = false; 54 net_device->destroy = false; 55 net_device->dev = device; 56 net_device->ndev = ndev; 57 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 58 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 59 60 hv_set_drvdata(device, net_device); 61 return net_device; 62 } 63 64 static void free_netvsc_device(struct netvsc_device *nvdev) 65 { 66 kfree(nvdev->cb_buffer); 67 kfree(nvdev); 68 } 69 70 static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 71 { 72 struct netvsc_device *net_device; 73 74 net_device = hv_get_drvdata(device); 75 if (net_device && net_device->destroy) 76 net_device = NULL; 77 78 return net_device; 79 } 80 81 static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 82 { 83 struct netvsc_device *net_device; 84 85 net_device = hv_get_drvdata(device); 86 87 if (!net_device) 88 goto get_in_err; 89 90 if (net_device->destroy && 91 atomic_read(&net_device->num_outstanding_sends) == 0) 92 net_device = NULL; 93 94 get_in_err: 95 return net_device; 96 } 97 98 99 static int netvsc_destroy_buf(struct netvsc_device *net_device) 100 { 101 struct nvsp_message *revoke_packet; 102 int ret = 0; 103 struct net_device *ndev = net_device->ndev; 104 105 /* 106 * If we got a section count, it means we received a 107 * SendReceiveBufferComplete msg (ie sent 108 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 109 * to send a revoke msg here 110 */ 111 if (net_device->recv_section_cnt) { 112 /* Send the revoke receive buffer */ 113 revoke_packet = &net_device->revoke_packet; 114 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 115 116 revoke_packet->hdr.msg_type = 117 NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 118 revoke_packet->msg.v1_msg. 119 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 120 121 ret = vmbus_sendpacket(net_device->dev->channel, 122 revoke_packet, 123 sizeof(struct nvsp_message), 124 (unsigned long)revoke_packet, 125 VM_PKT_DATA_INBAND, 0); 126 /* 127 * If we failed here, we might as well return and 128 * have a leak rather than continue and a bugchk 129 */ 130 if (ret != 0) { 131 netdev_err(ndev, "unable to send " 132 "revoke receive buffer to netvsp\n"); 133 return ret; 134 } 135 } 136 137 /* Teardown the gpadl on the vsp end */ 138 if (net_device->recv_buf_gpadl_handle) { 139 ret = vmbus_teardown_gpadl(net_device->dev->channel, 140 net_device->recv_buf_gpadl_handle); 141 142 /* If we failed here, we might as well return and have a leak 143 * rather than continue and a bugchk 144 */ 145 if (ret != 0) { 146 netdev_err(ndev, 147 "unable to teardown receive buffer's gpadl\n"); 148 return ret; 149 } 150 net_device->recv_buf_gpadl_handle = 0; 151 } 152 153 if (net_device->recv_buf) { 154 /* Free up the receive buffer */ 155 vfree(net_device->recv_buf); 156 net_device->recv_buf = NULL; 157 } 158 159 if (net_device->recv_section) { 160 net_device->recv_section_cnt = 0; 161 kfree(net_device->recv_section); 162 net_device->recv_section = NULL; 163 } 164 165 /* Deal with the send buffer we may have setup. 166 * If we got a send section size, it means we received a 167 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 168 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 169 * to send a revoke msg here 170 */ 171 if (net_device->send_section_size) { 172 /* Send the revoke receive buffer */ 173 revoke_packet = &net_device->revoke_packet; 174 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 175 176 revoke_packet->hdr.msg_type = 177 NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 178 revoke_packet->msg.v1_msg.revoke_send_buf.id = 179 NETVSC_SEND_BUFFER_ID; 180 181 ret = vmbus_sendpacket(net_device->dev->channel, 182 revoke_packet, 183 sizeof(struct nvsp_message), 184 (unsigned long)revoke_packet, 185 VM_PKT_DATA_INBAND, 0); 186 /* If we failed here, we might as well return and 187 * have a leak rather than continue and a bugchk 188 */ 189 if (ret != 0) { 190 netdev_err(ndev, "unable to send " 191 "revoke send buffer to netvsp\n"); 192 return ret; 193 } 194 } 195 /* Teardown the gpadl on the vsp end */ 196 if (net_device->send_buf_gpadl_handle) { 197 ret = vmbus_teardown_gpadl(net_device->dev->channel, 198 net_device->send_buf_gpadl_handle); 199 200 /* If we failed here, we might as well return and have a leak 201 * rather than continue and a bugchk 202 */ 203 if (ret != 0) { 204 netdev_err(ndev, 205 "unable to teardown send buffer's gpadl\n"); 206 return ret; 207 } 208 net_device->send_buf_gpadl_handle = 0; 209 } 210 if (net_device->send_buf) { 211 /* Free up the send buffer */ 212 vfree(net_device->send_buf); 213 net_device->send_buf = NULL; 214 } 215 kfree(net_device->send_section_map); 216 217 return ret; 218 } 219 220 static int netvsc_init_buf(struct hv_device *device) 221 { 222 int ret = 0; 223 unsigned long t; 224 struct netvsc_device *net_device; 225 struct nvsp_message *init_packet; 226 struct net_device *ndev; 227 int node; 228 229 net_device = get_outbound_net_device(device); 230 if (!net_device) 231 return -ENODEV; 232 ndev = net_device->ndev; 233 234 node = cpu_to_node(device->channel->target_cpu); 235 net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node); 236 if (!net_device->recv_buf) 237 net_device->recv_buf = vzalloc(net_device->recv_buf_size); 238 239 if (!net_device->recv_buf) { 240 netdev_err(ndev, "unable to allocate receive " 241 "buffer of size %d\n", net_device->recv_buf_size); 242 ret = -ENOMEM; 243 goto cleanup; 244 } 245 246 /* 247 * Establish the gpadl handle for this buffer on this 248 * channel. Note: This call uses the vmbus connection rather 249 * than the channel to establish the gpadl handle. 250 */ 251 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 252 net_device->recv_buf_size, 253 &net_device->recv_buf_gpadl_handle); 254 if (ret != 0) { 255 netdev_err(ndev, 256 "unable to establish receive buffer's gpadl\n"); 257 goto cleanup; 258 } 259 260 261 /* Notify the NetVsp of the gpadl handle */ 262 init_packet = &net_device->channel_init_pkt; 263 264 memset(init_packet, 0, sizeof(struct nvsp_message)); 265 266 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 267 init_packet->msg.v1_msg.send_recv_buf. 268 gpadl_handle = net_device->recv_buf_gpadl_handle; 269 init_packet->msg.v1_msg. 270 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 271 272 /* Send the gpadl notification request */ 273 ret = vmbus_sendpacket(device->channel, init_packet, 274 sizeof(struct nvsp_message), 275 (unsigned long)init_packet, 276 VM_PKT_DATA_INBAND, 277 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 278 if (ret != 0) { 279 netdev_err(ndev, 280 "unable to send receive buffer's gpadl to netvsp\n"); 281 goto cleanup; 282 } 283 284 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 285 BUG_ON(t == 0); 286 287 288 /* Check the response */ 289 if (init_packet->msg.v1_msg. 290 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 291 netdev_err(ndev, "Unable to complete receive buffer " 292 "initialization with NetVsp - status %d\n", 293 init_packet->msg.v1_msg. 294 send_recv_buf_complete.status); 295 ret = -EINVAL; 296 goto cleanup; 297 } 298 299 /* Parse the response */ 300 301 net_device->recv_section_cnt = init_packet->msg. 302 v1_msg.send_recv_buf_complete.num_sections; 303 304 net_device->recv_section = kmemdup( 305 init_packet->msg.v1_msg.send_recv_buf_complete.sections, 306 net_device->recv_section_cnt * 307 sizeof(struct nvsp_1_receive_buffer_section), 308 GFP_KERNEL); 309 if (net_device->recv_section == NULL) { 310 ret = -EINVAL; 311 goto cleanup; 312 } 313 314 /* 315 * For 1st release, there should only be 1 section that represents the 316 * entire receive buffer 317 */ 318 if (net_device->recv_section_cnt != 1 || 319 net_device->recv_section->offset != 0) { 320 ret = -EINVAL; 321 goto cleanup; 322 } 323 324 /* Now setup the send buffer. 325 */ 326 net_device->send_buf = vzalloc_node(net_device->send_buf_size, node); 327 if (!net_device->send_buf) 328 net_device->send_buf = vzalloc(net_device->send_buf_size); 329 if (!net_device->send_buf) { 330 netdev_err(ndev, "unable to allocate send " 331 "buffer of size %d\n", net_device->send_buf_size); 332 ret = -ENOMEM; 333 goto cleanup; 334 } 335 336 /* Establish the gpadl handle for this buffer on this 337 * channel. Note: This call uses the vmbus connection rather 338 * than the channel to establish the gpadl handle. 339 */ 340 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 341 net_device->send_buf_size, 342 &net_device->send_buf_gpadl_handle); 343 if (ret != 0) { 344 netdev_err(ndev, 345 "unable to establish send buffer's gpadl\n"); 346 goto cleanup; 347 } 348 349 /* Notify the NetVsp of the gpadl handle */ 350 init_packet = &net_device->channel_init_pkt; 351 memset(init_packet, 0, sizeof(struct nvsp_message)); 352 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 353 init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 354 net_device->send_buf_gpadl_handle; 355 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 356 357 /* Send the gpadl notification request */ 358 ret = vmbus_sendpacket(device->channel, init_packet, 359 sizeof(struct nvsp_message), 360 (unsigned long)init_packet, 361 VM_PKT_DATA_INBAND, 362 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 363 if (ret != 0) { 364 netdev_err(ndev, 365 "unable to send send buffer's gpadl to netvsp\n"); 366 goto cleanup; 367 } 368 369 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 370 BUG_ON(t == 0); 371 372 /* Check the response */ 373 if (init_packet->msg.v1_msg. 374 send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 375 netdev_err(ndev, "Unable to complete send buffer " 376 "initialization with NetVsp - status %d\n", 377 init_packet->msg.v1_msg. 378 send_send_buf_complete.status); 379 ret = -EINVAL; 380 goto cleanup; 381 } 382 383 /* Parse the response */ 384 net_device->send_section_size = init_packet->msg. 385 v1_msg.send_send_buf_complete.section_size; 386 387 /* Section count is simply the size divided by the section size. 388 */ 389 net_device->send_section_cnt = 390 net_device->send_buf_size/net_device->send_section_size; 391 392 dev_info(&device->device, "Send section size: %d, Section count:%d\n", 393 net_device->send_section_size, net_device->send_section_cnt); 394 395 /* Setup state for managing the send buffer. */ 396 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt, 397 BITS_PER_LONG); 398 399 net_device->send_section_map = 400 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL); 401 if (net_device->send_section_map == NULL) { 402 ret = -ENOMEM; 403 goto cleanup; 404 } 405 406 goto exit; 407 408 cleanup: 409 netvsc_destroy_buf(net_device); 410 411 exit: 412 return ret; 413 } 414 415 416 /* Negotiate NVSP protocol version */ 417 static int negotiate_nvsp_ver(struct hv_device *device, 418 struct netvsc_device *net_device, 419 struct nvsp_message *init_packet, 420 u32 nvsp_ver) 421 { 422 int ret; 423 unsigned long t; 424 425 memset(init_packet, 0, sizeof(struct nvsp_message)); 426 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 427 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 428 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 429 430 /* Send the init request */ 431 ret = vmbus_sendpacket(device->channel, init_packet, 432 sizeof(struct nvsp_message), 433 (unsigned long)init_packet, 434 VM_PKT_DATA_INBAND, 435 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 436 437 if (ret != 0) 438 return ret; 439 440 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 441 442 if (t == 0) 443 return -ETIMEDOUT; 444 445 if (init_packet->msg.init_msg.init_complete.status != 446 NVSP_STAT_SUCCESS) 447 return -EINVAL; 448 449 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 450 return 0; 451 452 /* NVSPv2 or later: Send NDIS config */ 453 memset(init_packet, 0, sizeof(struct nvsp_message)); 454 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 455 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu + 456 ETH_HLEN; 457 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 458 459 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) 460 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; 461 462 ret = vmbus_sendpacket(device->channel, init_packet, 463 sizeof(struct nvsp_message), 464 (unsigned long)init_packet, 465 VM_PKT_DATA_INBAND, 0); 466 467 return ret; 468 } 469 470 static int netvsc_connect_vsp(struct hv_device *device) 471 { 472 int ret; 473 struct netvsc_device *net_device; 474 struct nvsp_message *init_packet; 475 int ndis_version; 476 struct net_device *ndev; 477 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 478 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; 479 int i, num_ver = 4; /* number of different NVSP versions */ 480 481 net_device = get_outbound_net_device(device); 482 if (!net_device) 483 return -ENODEV; 484 ndev = net_device->ndev; 485 486 init_packet = &net_device->channel_init_pkt; 487 488 /* Negotiate the latest NVSP protocol supported */ 489 for (i = num_ver - 1; i >= 0; i--) 490 if (negotiate_nvsp_ver(device, net_device, init_packet, 491 ver_list[i]) == 0) { 492 net_device->nvsp_version = ver_list[i]; 493 break; 494 } 495 496 if (i < 0) { 497 ret = -EPROTO; 498 goto cleanup; 499 } 500 501 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 502 503 /* Send the ndis version */ 504 memset(init_packet, 0, sizeof(struct nvsp_message)); 505 506 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 507 ndis_version = 0x00060001; 508 else 509 ndis_version = 0x0006001e; 510 511 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 512 init_packet->msg.v1_msg. 513 send_ndis_ver.ndis_major_ver = 514 (ndis_version & 0xFFFF0000) >> 16; 515 init_packet->msg.v1_msg. 516 send_ndis_ver.ndis_minor_ver = 517 ndis_version & 0xFFFF; 518 519 /* Send the init request */ 520 ret = vmbus_sendpacket(device->channel, init_packet, 521 sizeof(struct nvsp_message), 522 (unsigned long)init_packet, 523 VM_PKT_DATA_INBAND, 0); 524 if (ret != 0) 525 goto cleanup; 526 527 /* Post the big receive buffer to NetVSP */ 528 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 529 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; 530 else 531 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 532 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; 533 534 ret = netvsc_init_buf(device); 535 536 cleanup: 537 return ret; 538 } 539 540 static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 541 { 542 netvsc_destroy_buf(net_device); 543 } 544 545 /* 546 * netvsc_device_remove - Callback when the root bus device is removed 547 */ 548 int netvsc_device_remove(struct hv_device *device) 549 { 550 struct netvsc_device *net_device; 551 unsigned long flags; 552 553 net_device = hv_get_drvdata(device); 554 555 netvsc_disconnect_vsp(net_device); 556 557 /* 558 * Since we have already drained, we don't need to busy wait 559 * as was done in final_release_stor_device() 560 * Note that we cannot set the ext pointer to NULL until 561 * we have drained - to drain the outgoing packets, we need to 562 * allow incoming packets. 563 */ 564 565 spin_lock_irqsave(&device->channel->inbound_lock, flags); 566 hv_set_drvdata(device, NULL); 567 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 568 569 /* 570 * At this point, no one should be accessing net_device 571 * except in here 572 */ 573 dev_notice(&device->device, "net device safe to remove\n"); 574 575 /* Now, we can close the channel safely */ 576 vmbus_close(device->channel); 577 578 /* Release all resources */ 579 vfree(net_device->sub_cb_buf); 580 free_netvsc_device(net_device); 581 return 0; 582 } 583 584 585 #define RING_AVAIL_PERCENT_HIWATER 20 586 #define RING_AVAIL_PERCENT_LOWATER 10 587 588 /* 589 * Get the percentage of available bytes to write in the ring. 590 * The return value is in range from 0 to 100. 591 */ 592 static inline u32 hv_ringbuf_avail_percent( 593 struct hv_ring_buffer_info *ring_info) 594 { 595 u32 avail_read, avail_write; 596 597 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 598 599 return avail_write * 100 / ring_info->ring_datasize; 600 } 601 602 static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 603 u32 index) 604 { 605 sync_change_bit(index, net_device->send_section_map); 606 } 607 608 static void netvsc_send_completion(struct netvsc_device *net_device, 609 struct vmbus_channel *incoming_channel, 610 struct hv_device *device, 611 struct vmpacket_descriptor *packet) 612 { 613 struct nvsp_message *nvsp_packet; 614 struct hv_netvsc_packet *nvsc_packet; 615 struct net_device *ndev; 616 u32 send_index; 617 struct sk_buff *skb; 618 619 ndev = net_device->ndev; 620 621 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 622 (packet->offset8 << 3)); 623 624 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 625 (nvsp_packet->hdr.msg_type == 626 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 627 (nvsp_packet->hdr.msg_type == 628 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) || 629 (nvsp_packet->hdr.msg_type == 630 NVSP_MSG5_TYPE_SUBCHANNEL)) { 631 /* Copy the response back */ 632 memcpy(&net_device->channel_init_pkt, nvsp_packet, 633 sizeof(struct nvsp_message)); 634 complete(&net_device->channel_init_wait); 635 } else if (nvsp_packet->hdr.msg_type == 636 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 637 int num_outstanding_sends; 638 u16 q_idx = 0; 639 struct vmbus_channel *channel = device->channel; 640 int queue_sends; 641 642 /* Get the send context */ 643 skb = (struct sk_buff *)(unsigned long)packet->trans_id; 644 645 /* Notify the layer above us */ 646 if (skb) { 647 nvsc_packet = (struct hv_netvsc_packet *) skb->cb; 648 send_index = nvsc_packet->send_buf_index; 649 if (send_index != NETVSC_INVALID_INDEX) 650 netvsc_free_send_slot(net_device, send_index); 651 q_idx = nvsc_packet->q_idx; 652 channel = incoming_channel; 653 dev_kfree_skb_any(skb); 654 } 655 656 num_outstanding_sends = 657 atomic_dec_return(&net_device->num_outstanding_sends); 658 queue_sends = atomic_dec_return(&net_device-> 659 queue_sends[q_idx]); 660 661 if (net_device->destroy && num_outstanding_sends == 0) 662 wake_up(&net_device->wait_drain); 663 664 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && 665 !net_device->start_remove && 666 (hv_ringbuf_avail_percent(&channel->outbound) > 667 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) 668 netif_tx_wake_queue(netdev_get_tx_queue( 669 ndev, q_idx)); 670 } else { 671 netdev_err(ndev, "Unknown send completion packet type- " 672 "%d received!!\n", nvsp_packet->hdr.msg_type); 673 } 674 675 } 676 677 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 678 { 679 unsigned long index; 680 u32 max_words = net_device->map_words; 681 unsigned long *map_addr = (unsigned long *)net_device->send_section_map; 682 u32 section_cnt = net_device->send_section_cnt; 683 int ret_val = NETVSC_INVALID_INDEX; 684 int i; 685 int prev_val; 686 687 for (i = 0; i < max_words; i++) { 688 if (!~(map_addr[i])) 689 continue; 690 index = ffz(map_addr[i]); 691 prev_val = sync_test_and_set_bit(index, &map_addr[i]); 692 if (prev_val) 693 continue; 694 if ((index + (i * BITS_PER_LONG)) >= section_cnt) 695 break; 696 ret_val = (index + (i * BITS_PER_LONG)); 697 break; 698 } 699 return ret_val; 700 } 701 702 static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, 703 unsigned int section_index, 704 u32 pend_size, 705 struct hv_netvsc_packet *packet, 706 struct rndis_message *rndis_msg, 707 struct hv_page_buffer **pb, 708 struct sk_buff *skb) 709 { 710 char *start = net_device->send_buf; 711 char *dest = start + (section_index * net_device->send_section_size) 712 + pend_size; 713 int i; 714 bool is_data_pkt = (skb != NULL) ? true : false; 715 bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 716 u32 msg_size = 0; 717 u32 padding = 0; 718 u32 remain = packet->total_data_buflen % net_device->pkt_align; 719 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 720 packet->page_buf_cnt; 721 722 /* Add padding */ 723 if (is_data_pkt && xmit_more && remain && 724 !packet->cp_partial) { 725 padding = net_device->pkt_align - remain; 726 rndis_msg->msg_len += padding; 727 packet->total_data_buflen += padding; 728 } 729 730 for (i = 0; i < page_count; i++) { 731 char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT); 732 u32 offset = (*pb)[i].offset; 733 u32 len = (*pb)[i].len; 734 735 memcpy(dest, (src + offset), len); 736 msg_size += len; 737 dest += len; 738 } 739 740 if (padding) { 741 memset(dest, 0, padding); 742 msg_size += padding; 743 } 744 745 return msg_size; 746 } 747 748 static inline int netvsc_send_pkt( 749 struct hv_netvsc_packet *packet, 750 struct netvsc_device *net_device, 751 struct hv_page_buffer **pb, 752 struct sk_buff *skb) 753 { 754 struct nvsp_message nvmsg; 755 u16 q_idx = packet->q_idx; 756 struct vmbus_channel *out_channel = net_device->chn_table[q_idx]; 757 struct net_device *ndev = net_device->ndev; 758 u64 req_id; 759 int ret; 760 struct hv_page_buffer *pgbuf; 761 u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); 762 bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 763 764 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 765 if (skb != NULL) { 766 /* 0 is RMC_DATA; */ 767 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; 768 } else { 769 /* 1 is RMC_CONTROL; */ 770 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; 771 } 772 773 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 774 packet->send_buf_index; 775 if (packet->send_buf_index == NETVSC_INVALID_INDEX) 776 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 777 else 778 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 779 packet->total_data_buflen; 780 781 req_id = (ulong)skb; 782 783 if (out_channel->rescind) 784 return -ENODEV; 785 786 /* 787 * It is possible that once we successfully place this packet 788 * on the ringbuffer, we may stop the queue. In that case, we want 789 * to notify the host independent of the xmit_more flag. We don't 790 * need to be precise here; in the worst case we may signal the host 791 * unnecessarily. 792 */ 793 if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1)) 794 xmit_more = false; 795 796 if (packet->page_buf_cnt) { 797 pgbuf = packet->cp_partial ? (*pb) + 798 packet->rmsg_pgcnt : (*pb); 799 ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, 800 pgbuf, 801 packet->page_buf_cnt, 802 &nvmsg, 803 sizeof(struct nvsp_message), 804 req_id, 805 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 806 !xmit_more); 807 } else { 808 ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, 809 sizeof(struct nvsp_message), 810 req_id, 811 VM_PKT_DATA_INBAND, 812 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 813 !xmit_more); 814 } 815 816 if (ret == 0) { 817 atomic_inc(&net_device->num_outstanding_sends); 818 atomic_inc(&net_device->queue_sends[q_idx]); 819 820 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { 821 netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx)); 822 823 if (atomic_read(&net_device-> 824 queue_sends[q_idx]) < 1) 825 netif_tx_wake_queue(netdev_get_tx_queue( 826 ndev, q_idx)); 827 } 828 } else if (ret == -EAGAIN) { 829 netif_tx_stop_queue(netdev_get_tx_queue( 830 ndev, q_idx)); 831 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) { 832 netif_tx_wake_queue(netdev_get_tx_queue( 833 ndev, q_idx)); 834 ret = -ENOSPC; 835 } 836 } else { 837 netdev_err(ndev, "Unable to send packet %p ret %d\n", 838 packet, ret); 839 } 840 841 return ret; 842 } 843 844 int netvsc_send(struct hv_device *device, 845 struct hv_netvsc_packet *packet, 846 struct rndis_message *rndis_msg, 847 struct hv_page_buffer **pb, 848 struct sk_buff *skb) 849 { 850 struct netvsc_device *net_device; 851 int ret = 0, m_ret = 0; 852 struct vmbus_channel *out_channel; 853 u16 q_idx = packet->q_idx; 854 u32 pktlen = packet->total_data_buflen, msd_len = 0; 855 unsigned int section_index = NETVSC_INVALID_INDEX; 856 struct multi_send_data *msdp; 857 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 858 bool try_batch; 859 bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 860 861 net_device = get_outbound_net_device(device); 862 if (!net_device) 863 return -ENODEV; 864 865 out_channel = net_device->chn_table[q_idx]; 866 867 packet->send_buf_index = NETVSC_INVALID_INDEX; 868 packet->cp_partial = false; 869 870 /* Send control message directly without accessing msd (Multi-Send 871 * Data) field which may be changed during data packet processing. 872 */ 873 if (!skb) { 874 cur_send = packet; 875 goto send_now; 876 } 877 878 msdp = &net_device->msd[q_idx]; 879 880 /* batch packets in send buffer if possible */ 881 if (msdp->pkt) 882 msd_len = msdp->pkt->total_data_buflen; 883 884 try_batch = (skb != NULL) && msd_len > 0 && msdp->count < 885 net_device->max_pkt; 886 887 if (try_batch && msd_len + pktlen + net_device->pkt_align < 888 net_device->send_section_size) { 889 section_index = msdp->pkt->send_buf_index; 890 891 } else if (try_batch && msd_len + packet->rmsg_size < 892 net_device->send_section_size) { 893 section_index = msdp->pkt->send_buf_index; 894 packet->cp_partial = true; 895 896 } else if ((skb != NULL) && pktlen + net_device->pkt_align < 897 net_device->send_section_size) { 898 section_index = netvsc_get_next_send_section(net_device); 899 if (section_index != NETVSC_INVALID_INDEX) { 900 msd_send = msdp->pkt; 901 msdp->pkt = NULL; 902 msdp->count = 0; 903 msd_len = 0; 904 } 905 } 906 907 if (section_index != NETVSC_INVALID_INDEX) { 908 netvsc_copy_to_send_buf(net_device, 909 section_index, msd_len, 910 packet, rndis_msg, pb, skb); 911 912 packet->send_buf_index = section_index; 913 914 if (packet->cp_partial) { 915 packet->page_buf_cnt -= packet->rmsg_pgcnt; 916 packet->total_data_buflen = msd_len + packet->rmsg_size; 917 } else { 918 packet->page_buf_cnt = 0; 919 packet->total_data_buflen += msd_len; 920 } 921 922 if (msdp->pkt) 923 dev_kfree_skb_any(skb); 924 925 if (xmit_more && !packet->cp_partial) { 926 msdp->pkt = packet; 927 msdp->count++; 928 } else { 929 cur_send = packet; 930 msdp->pkt = NULL; 931 msdp->count = 0; 932 } 933 } else { 934 msd_send = msdp->pkt; 935 msdp->pkt = NULL; 936 msdp->count = 0; 937 cur_send = packet; 938 } 939 940 if (msd_send) { 941 m_ret = netvsc_send_pkt(msd_send, net_device, pb, skb); 942 943 if (m_ret != 0) { 944 netvsc_free_send_slot(net_device, 945 msd_send->send_buf_index); 946 dev_kfree_skb_any(skb); 947 } 948 } 949 950 send_now: 951 if (cur_send) 952 ret = netvsc_send_pkt(cur_send, net_device, pb, skb); 953 954 if (ret != 0 && section_index != NETVSC_INVALID_INDEX) 955 netvsc_free_send_slot(net_device, section_index); 956 957 return ret; 958 } 959 960 static void netvsc_send_recv_completion(struct hv_device *device, 961 struct vmbus_channel *channel, 962 struct netvsc_device *net_device, 963 u64 transaction_id, u32 status) 964 { 965 struct nvsp_message recvcompMessage; 966 int retries = 0; 967 int ret; 968 struct net_device *ndev; 969 970 ndev = net_device->ndev; 971 972 recvcompMessage.hdr.msg_type = 973 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 974 975 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 976 977 retry_send_cmplt: 978 /* Send the completion */ 979 ret = vmbus_sendpacket(channel, &recvcompMessage, 980 sizeof(struct nvsp_message), transaction_id, 981 VM_PKT_COMP, 0); 982 if (ret == 0) { 983 /* success */ 984 /* no-op */ 985 } else if (ret == -EAGAIN) { 986 /* no more room...wait a bit and attempt to retry 3 times */ 987 retries++; 988 netdev_err(ndev, "unable to send receive completion pkt" 989 " (tid %llx)...retrying %d\n", transaction_id, retries); 990 991 if (retries < 4) { 992 udelay(100); 993 goto retry_send_cmplt; 994 } else { 995 netdev_err(ndev, "unable to send receive " 996 "completion pkt (tid %llx)...give up retrying\n", 997 transaction_id); 998 } 999 } else { 1000 netdev_err(ndev, "unable to send receive " 1001 "completion pkt - %llx\n", transaction_id); 1002 } 1003 } 1004 1005 static void netvsc_receive(struct netvsc_device *net_device, 1006 struct vmbus_channel *channel, 1007 struct hv_device *device, 1008 struct vmpacket_descriptor *packet) 1009 { 1010 struct vmtransfer_page_packet_header *vmxferpage_packet; 1011 struct nvsp_message *nvsp_packet; 1012 struct hv_netvsc_packet nv_pkt; 1013 struct hv_netvsc_packet *netvsc_packet = &nv_pkt; 1014 u32 status = NVSP_STAT_SUCCESS; 1015 int i; 1016 int count = 0; 1017 struct net_device *ndev; 1018 void *data; 1019 1020 ndev = net_device->ndev; 1021 1022 /* 1023 * All inbound packets other than send completion should be xfer page 1024 * packet 1025 */ 1026 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 1027 netdev_err(ndev, "Unknown packet type received - %d\n", 1028 packet->type); 1029 return; 1030 } 1031 1032 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 1033 (packet->offset8 << 3)); 1034 1035 /* Make sure this is a valid nvsp packet */ 1036 if (nvsp_packet->hdr.msg_type != 1037 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 1038 netdev_err(ndev, "Unknown nvsp packet type received-" 1039 " %d\n", nvsp_packet->hdr.msg_type); 1040 return; 1041 } 1042 1043 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 1044 1045 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 1046 netdev_err(ndev, "Invalid xfer page set id - " 1047 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 1048 vmxferpage_packet->xfer_pageset_id); 1049 return; 1050 } 1051 1052 count = vmxferpage_packet->range_cnt; 1053 1054 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 1055 for (i = 0; i < count; i++) { 1056 /* Initialize the netvsc packet */ 1057 data = (void *)((unsigned long)net_device-> 1058 recv_buf + vmxferpage_packet->ranges[i].byte_offset); 1059 netvsc_packet->total_data_buflen = 1060 vmxferpage_packet->ranges[i].byte_count; 1061 1062 /* Pass it to the upper layer */ 1063 status = rndis_filter_receive(device, netvsc_packet, &data, 1064 channel); 1065 1066 } 1067 1068 netvsc_send_recv_completion(device, channel, net_device, 1069 vmxferpage_packet->d.trans_id, status); 1070 } 1071 1072 1073 static void netvsc_send_table(struct hv_device *hdev, 1074 struct nvsp_message *nvmsg) 1075 { 1076 struct netvsc_device *nvscdev; 1077 struct net_device *ndev; 1078 int i; 1079 u32 count, *tab; 1080 1081 nvscdev = get_outbound_net_device(hdev); 1082 if (!nvscdev) 1083 return; 1084 ndev = nvscdev->ndev; 1085 1086 count = nvmsg->msg.v5_msg.send_table.count; 1087 if (count != VRSS_SEND_TAB_SIZE) { 1088 netdev_err(ndev, "Received wrong send-table size:%u\n", count); 1089 return; 1090 } 1091 1092 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + 1093 nvmsg->msg.v5_msg.send_table.offset); 1094 1095 for (i = 0; i < count; i++) 1096 nvscdev->send_table[i] = tab[i]; 1097 } 1098 1099 static void netvsc_send_vf(struct netvsc_device *nvdev, 1100 struct nvsp_message *nvmsg) 1101 { 1102 nvdev->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; 1103 nvdev->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; 1104 } 1105 1106 static inline void netvsc_receive_inband(struct hv_device *hdev, 1107 struct netvsc_device *nvdev, 1108 struct nvsp_message *nvmsg) 1109 { 1110 switch (nvmsg->hdr.msg_type) { 1111 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: 1112 netvsc_send_table(hdev, nvmsg); 1113 break; 1114 1115 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: 1116 netvsc_send_vf(nvdev, nvmsg); 1117 break; 1118 } 1119 } 1120 1121 void netvsc_channel_cb(void *context) 1122 { 1123 int ret; 1124 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1125 struct hv_device *device; 1126 struct netvsc_device *net_device; 1127 u32 bytes_recvd; 1128 u64 request_id; 1129 struct vmpacket_descriptor *desc; 1130 unsigned char *buffer; 1131 int bufferlen = NETVSC_PACKET_SIZE; 1132 struct net_device *ndev; 1133 struct nvsp_message *nvmsg; 1134 1135 if (channel->primary_channel != NULL) 1136 device = channel->primary_channel->device_obj; 1137 else 1138 device = channel->device_obj; 1139 1140 net_device = get_inbound_net_device(device); 1141 if (!net_device) 1142 return; 1143 ndev = net_device->ndev; 1144 buffer = get_per_channel_state(channel); 1145 1146 do { 1147 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen, 1148 &bytes_recvd, &request_id); 1149 if (ret == 0) { 1150 if (bytes_recvd > 0) { 1151 desc = (struct vmpacket_descriptor *)buffer; 1152 nvmsg = (struct nvsp_message *)((unsigned long) 1153 desc + (desc->offset8 << 3)); 1154 switch (desc->type) { 1155 case VM_PKT_COMP: 1156 netvsc_send_completion(net_device, 1157 channel, 1158 device, desc); 1159 break; 1160 1161 case VM_PKT_DATA_USING_XFER_PAGES: 1162 netvsc_receive(net_device, channel, 1163 device, desc); 1164 break; 1165 1166 case VM_PKT_DATA_INBAND: 1167 netvsc_receive_inband(device, 1168 net_device, 1169 nvmsg); 1170 break; 1171 1172 default: 1173 netdev_err(ndev, 1174 "unhandled packet type %d, " 1175 "tid %llx len %d\n", 1176 desc->type, request_id, 1177 bytes_recvd); 1178 break; 1179 } 1180 1181 } else { 1182 /* 1183 * We are done for this pass. 1184 */ 1185 break; 1186 } 1187 1188 } else if (ret == -ENOBUFS) { 1189 if (bufferlen > NETVSC_PACKET_SIZE) 1190 kfree(buffer); 1191 /* Handle large packet */ 1192 buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 1193 if (buffer == NULL) { 1194 /* Try again next time around */ 1195 netdev_err(ndev, 1196 "unable to allocate buffer of size " 1197 "(%d)!!\n", bytes_recvd); 1198 break; 1199 } 1200 1201 bufferlen = bytes_recvd; 1202 } 1203 } while (1); 1204 1205 if (bufferlen > NETVSC_PACKET_SIZE) 1206 kfree(buffer); 1207 return; 1208 } 1209 1210 /* 1211 * netvsc_device_add - Callback when the device belonging to this 1212 * driver is added 1213 */ 1214 int netvsc_device_add(struct hv_device *device, void *additional_info) 1215 { 1216 int ret = 0; 1217 int ring_size = 1218 ((struct netvsc_device_info *)additional_info)->ring_size; 1219 struct netvsc_device *net_device; 1220 struct net_device *ndev; 1221 1222 net_device = alloc_net_device(device); 1223 if (!net_device) 1224 return -ENOMEM; 1225 1226 net_device->ring_size = ring_size; 1227 1228 /* 1229 * Coming into this function, struct net_device * is 1230 * registered as the driver private data. 1231 * In alloc_net_device(), we register struct netvsc_device * 1232 * as the driver private data and stash away struct net_device * 1233 * in struct netvsc_device *. 1234 */ 1235 ndev = net_device->ndev; 1236 1237 /* Add netvsc_device context to netvsc_device */ 1238 net_device->nd_ctx = netdev_priv(ndev); 1239 1240 /* Initialize the NetVSC channel extension */ 1241 init_completion(&net_device->channel_init_wait); 1242 1243 set_per_channel_state(device->channel, net_device->cb_buffer); 1244 1245 /* Open the channel */ 1246 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 1247 ring_size * PAGE_SIZE, NULL, 0, 1248 netvsc_channel_cb, device->channel); 1249 1250 if (ret != 0) { 1251 netdev_err(ndev, "unable to open channel: %d\n", ret); 1252 goto cleanup; 1253 } 1254 1255 /* Channel is opened */ 1256 pr_info("hv_netvsc channel opened successfully\n"); 1257 1258 net_device->chn_table[0] = device->channel; 1259 1260 /* Connect with the NetVsp */ 1261 ret = netvsc_connect_vsp(device); 1262 if (ret != 0) { 1263 netdev_err(ndev, 1264 "unable to connect to NetVSP - %d\n", ret); 1265 goto close; 1266 } 1267 1268 return ret; 1269 1270 close: 1271 /* Now, we can close the channel safely */ 1272 vmbus_close(device->channel); 1273 1274 cleanup: 1275 free_netvsc_device(net_device); 1276 1277 return ret; 1278 } 1279