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