1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (c) 2009, Microsoft Corporation. 4 * 5 * Authors: 6 * Haiyang Zhang <haiyangz@microsoft.com> 7 * Hank Janssen <hjanssen@microsoft.com> 8 */ 9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11#include <linux/kernel.h> 12#include <linux/sched.h> 13#include <linux/wait.h> 14#include <linux/mm.h> 15#include <linux/delay.h> 16#include <linux/io.h> 17#include <linux/slab.h> 18#include <linux/netdevice.h> 19#include <linux/if_ether.h> 20#include <linux/vmalloc.h> 21#include <linux/rtnetlink.h> 22#include <linux/prefetch.h> 23#include <linux/filter.h> 24 25#include <asm/sync_bitops.h> 26#include <asm/mshyperv.h> 27 28#include "hyperv_net.h" 29#include "netvsc_trace.h" 30 31/* 32 * Switch the data path from the synthetic interface to the VF 33 * interface. 34 */ 35int netvsc_switch_datapath(struct net_device *ndev, bool vf) 36{ 37 struct net_device_context *net_device_ctx = netdev_priv(ndev); 38 struct hv_device *dev = net_device_ctx->device_ctx; 39 struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); 40 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; 41 int ret, retry = 0; 42 43 /* Block sending traffic to VF if it's about to be gone */ 44 if (!vf) 45 net_device_ctx->data_path_is_vf = vf; 46 47 memset(init_pkt, 0, sizeof(struct nvsp_message)); 48 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; 49 if (vf) 50 init_pkt->msg.v4_msg.active_dp.active_datapath = 51 NVSP_DATAPATH_VF; 52 else 53 init_pkt->msg.v4_msg.active_dp.active_datapath = 54 NVSP_DATAPATH_SYNTHETIC; 55 56again: 57 trace_nvsp_send(ndev, init_pkt); 58 59 ret = vmbus_sendpacket(dev->channel, init_pkt, 60 sizeof(struct nvsp_message), 61 (unsigned long)init_pkt, VM_PKT_DATA_INBAND, 62 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 63 64 /* If failed to switch to/from VF, let data_path_is_vf stay false, 65 * so we use synthetic path to send data. 66 */ 67 if (ret) { 68 if (ret != -EAGAIN) { 69 netdev_err(ndev, 70 "Unable to send sw datapath msg, err: %d\n", 71 ret); 72 return ret; 73 } 74 75 if (retry++ < RETRY_MAX) { 76 usleep_range(RETRY_US_LO, RETRY_US_HI); 77 goto again; 78 } else { 79 netdev_err( 80 ndev, 81 "Retry failed to send sw datapath msg, err: %d\n", 82 ret); 83 return ret; 84 } 85 } 86 87 wait_for_completion(&nv_dev->channel_init_wait); 88 net_device_ctx->data_path_is_vf = vf; 89 90 return 0; 91} 92 93/* Worker to setup sub channels on initial setup 94 * Initial hotplug event occurs in softirq context 95 * and can't wait for channels. 96 */ 97static void netvsc_subchan_work(struct work_struct *w) 98{ 99 struct netvsc_device *nvdev = 100 container_of(w, struct netvsc_device, subchan_work); 101 struct rndis_device *rdev; 102 int i, ret; 103 104 /* Avoid deadlock with device removal already under RTNL */ 105 if (!rtnl_trylock()) { 106 schedule_work(w); 107 return; 108 } 109 110 rdev = nvdev->extension; 111 if (rdev) { 112 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL); 113 if (ret == 0) { 114 netif_device_attach(rdev->ndev); 115 } else { 116 /* fallback to only primary channel */ 117 for (i = 1; i < nvdev->num_chn; i++) 118 netif_napi_del(&nvdev->chan_table[i].napi); 119 120 nvdev->max_chn = 1; 121 nvdev->num_chn = 1; 122 } 123 } 124 125 rtnl_unlock(); 126} 127 128static struct netvsc_device *alloc_net_device(void) 129{ 130 struct netvsc_device *net_device; 131 132 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 133 if (!net_device) 134 return NULL; 135 136 init_waitqueue_head(&net_device->wait_drain); 137 net_device->destroy = false; 138 net_device->tx_disable = true; 139 140 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 141 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 142 143 init_completion(&net_device->channel_init_wait); 144 init_waitqueue_head(&net_device->subchan_open); 145 INIT_WORK(&net_device->subchan_work, netvsc_subchan_work); 146 147 return net_device; 148} 149 150static void free_netvsc_device(struct rcu_head *head) 151{ 152 struct netvsc_device *nvdev 153 = container_of(head, struct netvsc_device, rcu); 154 int i; 155 156 kfree(nvdev->extension); 157 158 if (!nvdev->recv_buf_gpadl_handle.decrypted) 159 vfree(nvdev->recv_buf); 160 if (!nvdev->send_buf_gpadl_handle.decrypted) 161 vfree(nvdev->send_buf); 162 bitmap_free(nvdev->send_section_map); 163 164 for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 165 xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq); 166 kfree(nvdev->chan_table[i].recv_buf); 167 vfree(nvdev->chan_table[i].mrc.slots); 168 } 169 170 kfree(nvdev); 171} 172 173static void free_netvsc_device_rcu(struct netvsc_device *nvdev) 174{ 175 call_rcu(&nvdev->rcu, free_netvsc_device); 176} 177 178static void netvsc_revoke_recv_buf(struct hv_device *device, 179 struct netvsc_device *net_device, 180 struct net_device *ndev) 181{ 182 struct nvsp_message *revoke_packet; 183 int ret; 184 185 /* 186 * If we got a section count, it means we received a 187 * SendReceiveBufferComplete msg (ie sent 188 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 189 * to send a revoke msg here 190 */ 191 if (net_device->recv_section_cnt) { 192 /* Send the revoke receive buffer */ 193 revoke_packet = &net_device->revoke_packet; 194 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 195 196 revoke_packet->hdr.msg_type = 197 NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 198 revoke_packet->msg.v1_msg. 199 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 200 201 trace_nvsp_send(ndev, revoke_packet); 202 203 ret = vmbus_sendpacket(device->channel, 204 revoke_packet, 205 sizeof(struct nvsp_message), 206 VMBUS_RQST_ID_NO_RESPONSE, 207 VM_PKT_DATA_INBAND, 0); 208 /* If the failure is because the channel is rescinded; 209 * ignore the failure since we cannot send on a rescinded 210 * channel. This would allow us to properly cleanup 211 * even when the channel is rescinded. 212 */ 213 if (device->channel->rescind) 214 ret = 0; 215 /* 216 * If we failed here, we might as well return and 217 * have a leak rather than continue and a bugchk 218 */ 219 if (ret != 0) { 220 netdev_err(ndev, "unable to send " 221 "revoke receive buffer to netvsp\n"); 222 return; 223 } 224 net_device->recv_section_cnt = 0; 225 } 226} 227 228static void netvsc_revoke_send_buf(struct hv_device *device, 229 struct netvsc_device *net_device, 230 struct net_device *ndev) 231{ 232 struct nvsp_message *revoke_packet; 233 int ret; 234 235 /* Deal with the send buffer we may have setup. 236 * If we got a send section size, it means we received a 237 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 238 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 239 * to send a revoke msg here 240 */ 241 if (net_device->send_section_cnt) { 242 /* Send the revoke receive buffer */ 243 revoke_packet = &net_device->revoke_packet; 244 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 245 246 revoke_packet->hdr.msg_type = 247 NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 248 revoke_packet->msg.v1_msg.revoke_send_buf.id = 249 NETVSC_SEND_BUFFER_ID; 250 251 trace_nvsp_send(ndev, revoke_packet); 252 253 ret = vmbus_sendpacket(device->channel, 254 revoke_packet, 255 sizeof(struct nvsp_message), 256 VMBUS_RQST_ID_NO_RESPONSE, 257 VM_PKT_DATA_INBAND, 0); 258 259 /* If the failure is because the channel is rescinded; 260 * ignore the failure since we cannot send on a rescinded 261 * channel. This would allow us to properly cleanup 262 * even when the channel is rescinded. 263 */ 264 if (device->channel->rescind) 265 ret = 0; 266 267 /* If we failed here, we might as well return and 268 * have a leak rather than continue and a bugchk 269 */ 270 if (ret != 0) { 271 netdev_err(ndev, "unable to send " 272 "revoke send buffer to netvsp\n"); 273 return; 274 } 275 net_device->send_section_cnt = 0; 276 } 277} 278 279static void netvsc_teardown_recv_gpadl(struct hv_device *device, 280 struct netvsc_device *net_device, 281 struct net_device *ndev) 282{ 283 int ret; 284 285 if (net_device->recv_buf_gpadl_handle.gpadl_handle) { 286 ret = vmbus_teardown_gpadl(device->channel, 287 &net_device->recv_buf_gpadl_handle); 288 289 /* If we failed here, we might as well return and have a leak 290 * rather than continue and a bugchk 291 */ 292 if (ret != 0) { 293 netdev_err(ndev, 294 "unable to teardown receive buffer's gpadl\n"); 295 return; 296 } 297 } 298} 299 300static void netvsc_teardown_send_gpadl(struct hv_device *device, 301 struct netvsc_device *net_device, 302 struct net_device *ndev) 303{ 304 int ret; 305 306 if (net_device->send_buf_gpadl_handle.gpadl_handle) { 307 ret = vmbus_teardown_gpadl(device->channel, 308 &net_device->send_buf_gpadl_handle); 309 310 /* If we failed here, we might as well return and have a leak 311 * rather than continue and a bugchk 312 */ 313 if (ret != 0) { 314 netdev_err(ndev, 315 "unable to teardown send buffer's gpadl\n"); 316 return; 317 } 318 } 319} 320 321int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) 322{ 323 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx]; 324 int node = cpu_to_node(nvchan->channel->target_cpu); 325 size_t size; 326 327 size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data); 328 nvchan->mrc.slots = vzalloc_node(size, node); 329 if (!nvchan->mrc.slots) 330 nvchan->mrc.slots = vzalloc(size); 331 332 return nvchan->mrc.slots ? 0 : -ENOMEM; 333} 334 335static int netvsc_init_buf(struct hv_device *device, 336 struct netvsc_device *net_device, 337 const struct netvsc_device_info *device_info) 338{ 339 struct nvsp_1_message_send_receive_buffer_complete *resp; 340 struct net_device *ndev = hv_get_drvdata(device); 341 struct nvsp_message *init_packet; 342 unsigned int buf_size; 343 int i, ret = 0; 344 345 /* Get receive buffer area. */ 346 buf_size = device_info->recv_sections * device_info->recv_section_size; 347 buf_size = roundup(buf_size, PAGE_SIZE); 348 349 /* Legacy hosts only allow smaller receive buffer */ 350 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 351 buf_size = min_t(unsigned int, buf_size, 352 NETVSC_RECEIVE_BUFFER_SIZE_LEGACY); 353 354 net_device->recv_buf = vzalloc(buf_size); 355 if (!net_device->recv_buf) { 356 netdev_err(ndev, 357 "unable to allocate receive buffer of size %u\n", 358 buf_size); 359 ret = -ENOMEM; 360 goto cleanup; 361 } 362 363 net_device->recv_buf_size = buf_size; 364 365 /* 366 * Establish the gpadl handle for this buffer on this 367 * channel. Note: This call uses the vmbus connection rather 368 * than the channel to establish the gpadl handle. 369 */ 370 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 371 buf_size, 372 &net_device->recv_buf_gpadl_handle); 373 if (ret != 0) { 374 netdev_err(ndev, 375 "unable to establish receive buffer's gpadl\n"); 376 goto cleanup; 377 } 378 379 /* Notify the NetVsp of the gpadl handle */ 380 init_packet = &net_device->channel_init_pkt; 381 memset(init_packet, 0, sizeof(struct nvsp_message)); 382 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 383 init_packet->msg.v1_msg.send_recv_buf. 384 gpadl_handle = net_device->recv_buf_gpadl_handle.gpadl_handle; 385 init_packet->msg.v1_msg. 386 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 387 388 trace_nvsp_send(ndev, init_packet); 389 390 /* Send the gpadl notification request */ 391 ret = vmbus_sendpacket(device->channel, init_packet, 392 sizeof(struct nvsp_message), 393 (unsigned long)init_packet, 394 VM_PKT_DATA_INBAND, 395 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 396 if (ret != 0) { 397 netdev_err(ndev, 398 "unable to send receive buffer's gpadl to netvsp\n"); 399 goto cleanup; 400 } 401 402 wait_for_completion(&net_device->channel_init_wait); 403 404 /* Check the response */ 405 resp = &init_packet->msg.v1_msg.send_recv_buf_complete; 406 if (resp->status != NVSP_STAT_SUCCESS) { 407 netdev_err(ndev, 408 "Unable to complete receive buffer initialization with NetVsp - status %d\n", 409 resp->status); 410 ret = -EINVAL; 411 goto cleanup; 412 } 413 414 /* Parse the response */ 415 netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", 416 resp->num_sections, resp->sections[0].sub_alloc_size, 417 resp->sections[0].num_sub_allocs); 418 419 /* There should only be one section for the entire receive buffer */ 420 if (resp->num_sections != 1 || resp->sections[0].offset != 0) { 421 ret = -EINVAL; 422 goto cleanup; 423 } 424 425 net_device->recv_section_size = resp->sections[0].sub_alloc_size; 426 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs; 427 428 /* Ensure buffer will not overflow */ 429 if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size * 430 (u64)net_device->recv_section_cnt > (u64)buf_size) { 431 netdev_err(ndev, "invalid recv_section_size %u\n", 432 net_device->recv_section_size); 433 ret = -EINVAL; 434 goto cleanup; 435 } 436 437 for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 438 struct netvsc_channel *nvchan = &net_device->chan_table[i]; 439 440 nvchan->recv_buf = kzalloc(net_device->recv_section_size, GFP_KERNEL); 441 if (nvchan->recv_buf == NULL) { 442 ret = -ENOMEM; 443 goto cleanup; 444 } 445 } 446 447 /* Setup receive completion ring. 448 * Add 1 to the recv_section_cnt because at least one entry in a 449 * ring buffer has to be empty. 450 */ 451 net_device->recv_completion_cnt = net_device->recv_section_cnt + 1; 452 ret = netvsc_alloc_recv_comp_ring(net_device, 0); 453 if (ret) 454 goto cleanup; 455 456 /* Now setup the send buffer. */ 457 buf_size = device_info->send_sections * device_info->send_section_size; 458 buf_size = round_up(buf_size, PAGE_SIZE); 459 460 net_device->send_buf = vzalloc(buf_size); 461 if (!net_device->send_buf) { 462 netdev_err(ndev, "unable to allocate send buffer of size %u\n", 463 buf_size); 464 ret = -ENOMEM; 465 goto cleanup; 466 } 467 net_device->send_buf_size = buf_size; 468 469 /* Establish the gpadl handle for this buffer on this 470 * channel. Note: This call uses the vmbus connection rather 471 * than the channel to establish the gpadl handle. 472 */ 473 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 474 buf_size, 475 &net_device->send_buf_gpadl_handle); 476 if (ret != 0) { 477 netdev_err(ndev, 478 "unable to establish send buffer's gpadl\n"); 479 goto cleanup; 480 } 481 482 /* Notify the NetVsp of the gpadl handle */ 483 init_packet = &net_device->channel_init_pkt; 484 memset(init_packet, 0, sizeof(struct nvsp_message)); 485 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 486 init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 487 net_device->send_buf_gpadl_handle.gpadl_handle; 488 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 489 490 trace_nvsp_send(ndev, init_packet); 491 492 /* Send the gpadl notification request */ 493 ret = vmbus_sendpacket(device->channel, init_packet, 494 sizeof(struct nvsp_message), 495 (unsigned long)init_packet, 496 VM_PKT_DATA_INBAND, 497 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 498 if (ret != 0) { 499 netdev_err(ndev, 500 "unable to send send buffer's gpadl to netvsp\n"); 501 goto cleanup; 502 } 503 504 wait_for_completion(&net_device->channel_init_wait); 505 506 /* Check the response */ 507 if (init_packet->msg.v1_msg. 508 send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 509 netdev_err(ndev, "Unable to complete send buffer " 510 "initialization with NetVsp - status %d\n", 511 init_packet->msg.v1_msg. 512 send_send_buf_complete.status); 513 ret = -EINVAL; 514 goto cleanup; 515 } 516 517 /* Parse the response */ 518 net_device->send_section_size = init_packet->msg. 519 v1_msg.send_send_buf_complete.section_size; 520 if (net_device->send_section_size < NETVSC_MTU_MIN) { 521 netdev_err(ndev, "invalid send_section_size %u\n", 522 net_device->send_section_size); 523 ret = -EINVAL; 524 goto cleanup; 525 } 526 527 /* Section count is simply the size divided by the section size. */ 528 net_device->send_section_cnt = buf_size / net_device->send_section_size; 529 530 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", 531 net_device->send_section_size, net_device->send_section_cnt); 532 533 /* Setup state for managing the send buffer. */ 534 net_device->send_section_map = bitmap_zalloc(net_device->send_section_cnt, 535 GFP_KERNEL); 536 if (!net_device->send_section_map) { 537 ret = -ENOMEM; 538 goto cleanup; 539 } 540 541 goto exit; 542 543cleanup: 544 netvsc_revoke_recv_buf(device, net_device, ndev); 545 netvsc_revoke_send_buf(device, net_device, ndev); 546 netvsc_teardown_recv_gpadl(device, net_device, ndev); 547 netvsc_teardown_send_gpadl(device, net_device, ndev); 548 549exit: 550 return ret; 551} 552 553/* Negotiate NVSP protocol version */ 554static int negotiate_nvsp_ver(struct hv_device *device, 555 struct netvsc_device *net_device, 556 struct nvsp_message *init_packet, 557 u32 nvsp_ver) 558{ 559 struct net_device *ndev = hv_get_drvdata(device); 560 int ret; 561 562 memset(init_packet, 0, sizeof(struct nvsp_message)); 563 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 564 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 565 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 566 trace_nvsp_send(ndev, init_packet); 567 568 /* Send the init request */ 569 ret = vmbus_sendpacket(device->channel, init_packet, 570 sizeof(struct nvsp_message), 571 (unsigned long)init_packet, 572 VM_PKT_DATA_INBAND, 573 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 574 575 if (ret != 0) 576 return ret; 577 578 wait_for_completion(&net_device->channel_init_wait); 579 580 if (init_packet->msg.init_msg.init_complete.status != 581 NVSP_STAT_SUCCESS) 582 return -EINVAL; 583 584 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 585 return 0; 586 587 /* NVSPv2 or later: Send NDIS config */ 588 memset(init_packet, 0, sizeof(struct nvsp_message)); 589 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 590 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; 591 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 592 593 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { 594 if (hv_is_isolation_supported()) 595 netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n"); 596 else 597 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; 598 599 /* Teaming bit is needed to receive link speed updates */ 600 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; 601 } 602 603 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61) 604 init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1; 605 606 trace_nvsp_send(ndev, init_packet); 607 608 ret = vmbus_sendpacket(device->channel, init_packet, 609 sizeof(struct nvsp_message), 610 VMBUS_RQST_ID_NO_RESPONSE, 611 VM_PKT_DATA_INBAND, 0); 612 613 return ret; 614} 615 616static int netvsc_connect_vsp(struct hv_device *device, 617 struct netvsc_device *net_device, 618 const struct netvsc_device_info *device_info) 619{ 620 struct net_device *ndev = hv_get_drvdata(device); 621 static const u32 ver_list[] = { 622 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 623 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5, 624 NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61 625 }; 626 struct nvsp_message *init_packet; 627 int ndis_version, i, ret; 628 629 init_packet = &net_device->channel_init_pkt; 630 631 /* Negotiate the latest NVSP protocol supported */ 632 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) 633 if (negotiate_nvsp_ver(device, net_device, init_packet, 634 ver_list[i]) == 0) { 635 net_device->nvsp_version = ver_list[i]; 636 break; 637 } 638 639 if (i < 0) { 640 ret = -EPROTO; 641 goto cleanup; 642 } 643 644 if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) { 645 netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n", 646 net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61); 647 ret = -EPROTO; 648 goto cleanup; 649 } 650 651 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 652 653 /* Send the ndis version */ 654 memset(init_packet, 0, sizeof(struct nvsp_message)); 655 656 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 657 ndis_version = 0x00060001; 658 else 659 ndis_version = 0x0006001e; 660 661 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 662 init_packet->msg.v1_msg. 663 send_ndis_ver.ndis_major_ver = 664 (ndis_version & 0xFFFF0000) >> 16; 665 init_packet->msg.v1_msg. 666 send_ndis_ver.ndis_minor_ver = 667 ndis_version & 0xFFFF; 668 669 trace_nvsp_send(ndev, init_packet); 670 671 /* Send the init request */ 672 ret = vmbus_sendpacket(device->channel, init_packet, 673 sizeof(struct nvsp_message), 674 VMBUS_RQST_ID_NO_RESPONSE, 675 VM_PKT_DATA_INBAND, 0); 676 if (ret != 0) 677 goto cleanup; 678 679 680 ret = netvsc_init_buf(device, net_device, device_info); 681 682cleanup: 683 return ret; 684} 685 686/* 687 * netvsc_device_remove - Callback when the root bus device is removed 688 */ 689void netvsc_device_remove(struct hv_device *device) 690{ 691 struct net_device *ndev = hv_get_drvdata(device); 692 struct net_device_context *net_device_ctx = netdev_priv(ndev); 693 struct netvsc_device *net_device 694 = rtnl_dereference(net_device_ctx->nvdev); 695 int i; 696 697 /* 698 * Revoke receive buffer. If host is pre-Win2016 then tear down 699 * receive buffer GPADL. Do the same for send buffer. 700 */ 701 netvsc_revoke_recv_buf(device, net_device, ndev); 702 if (vmbus_proto_version < VERSION_WIN10) 703 netvsc_teardown_recv_gpadl(device, net_device, ndev); 704 705 netvsc_revoke_send_buf(device, net_device, ndev); 706 if (vmbus_proto_version < VERSION_WIN10) 707 netvsc_teardown_send_gpadl(device, net_device, ndev); 708 709 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); 710 711 /* Disable NAPI and disassociate its context from the device. */ 712 for (i = 0; i < net_device->num_chn; i++) { 713 /* See also vmbus_reset_channel_cb(). */ 714 /* only disable enabled NAPI channel */ 715 if (i < ndev->real_num_rx_queues) 716 napi_disable(&net_device->chan_table[i].napi); 717 718 netif_napi_del(&net_device->chan_table[i].napi); 719 } 720 721 /* 722 * At this point, no one should be accessing net_device 723 * except in here 724 */ 725 netdev_dbg(ndev, "net device safe to remove\n"); 726 727 /* Now, we can close the channel safely */ 728 vmbus_close(device->channel); 729 730 /* 731 * If host is Win2016 or higher then we do the GPADL tear down 732 * here after VMBus is closed. 733 */ 734 if (vmbus_proto_version >= VERSION_WIN10) { 735 netvsc_teardown_recv_gpadl(device, net_device, ndev); 736 netvsc_teardown_send_gpadl(device, net_device, ndev); 737 } 738 739 /* Release all resources */ 740 free_netvsc_device_rcu(net_device); 741} 742 743#define RING_AVAIL_PERCENT_HIWATER 20 744#define RING_AVAIL_PERCENT_LOWATER 10 745 746static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 747 u32 index) 748{ 749 sync_change_bit(index, net_device->send_section_map); 750} 751 752static void netvsc_send_tx_complete(struct net_device *ndev, 753 struct netvsc_device *net_device, 754 struct vmbus_channel *channel, 755 const struct vmpacket_descriptor *desc, 756 int budget) 757{ 758 struct net_device_context *ndev_ctx = netdev_priv(ndev); 759 struct sk_buff *skb; 760 u16 q_idx = 0; 761 int queue_sends; 762 u64 cmd_rqst; 763 764 cmd_rqst = channel->request_addr_callback(channel, desc->trans_id); 765 if (cmd_rqst == VMBUS_RQST_ERROR) { 766 netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id); 767 return; 768 } 769 770 skb = (struct sk_buff *)(unsigned long)cmd_rqst; 771 772 /* Notify the layer above us */ 773 if (likely(skb)) { 774 struct hv_netvsc_packet *packet 775 = (struct hv_netvsc_packet *)skb->cb; 776 u32 send_index = packet->send_buf_index; 777 struct netvsc_stats_tx *tx_stats; 778 779 if (send_index != NETVSC_INVALID_INDEX) 780 netvsc_free_send_slot(net_device, send_index); 781 q_idx = packet->q_idx; 782 783 tx_stats = &net_device->chan_table[q_idx].tx_stats; 784 785 u64_stats_update_begin(&tx_stats->syncp); 786 tx_stats->packets += packet->total_packets; 787 tx_stats->bytes += packet->total_bytes; 788 u64_stats_update_end(&tx_stats->syncp); 789 790 netvsc_dma_unmap(ndev_ctx->device_ctx, packet); 791 napi_consume_skb(skb, budget); 792 } 793 794 queue_sends = 795 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); 796 797 if (unlikely(net_device->destroy)) { 798 if (queue_sends == 0) 799 wake_up(&net_device->wait_drain); 800 } else { 801 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx); 802 803 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable && 804 (hv_get_avail_to_write_percent(&channel->outbound) > 805 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) { 806 netif_tx_wake_queue(txq); 807 ndev_ctx->eth_stats.wake_queue++; 808 } 809 } 810} 811 812static void netvsc_send_completion(struct net_device *ndev, 813 struct netvsc_device *net_device, 814 struct vmbus_channel *incoming_channel, 815 const struct vmpacket_descriptor *desc, 816 int budget) 817{ 818 const struct nvsp_message *nvsp_packet; 819 u32 msglen = hv_pkt_datalen(desc); 820 struct nvsp_message *pkt_rqst; 821 u64 cmd_rqst; 822 u32 status; 823 824 /* First check if this is a VMBUS completion without data payload */ 825 if (!msglen) { 826 cmd_rqst = incoming_channel->request_addr_callback(incoming_channel, 827 desc->trans_id); 828 if (cmd_rqst == VMBUS_RQST_ERROR) { 829 netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id); 830 return; 831 } 832 833 pkt_rqst = (struct nvsp_message *)(uintptr_t)cmd_rqst; 834 switch (pkt_rqst->hdr.msg_type) { 835 case NVSP_MSG4_TYPE_SWITCH_DATA_PATH: 836 complete(&net_device->channel_init_wait); 837 break; 838 839 default: 840 netdev_err(ndev, "Unexpected VMBUS completion!!\n"); 841 } 842 return; 843 } 844 845 /* Ensure packet is big enough to read header fields */ 846 if (msglen < sizeof(struct nvsp_message_header)) { 847 netdev_err(ndev, "nvsp_message length too small: %u\n", msglen); 848 return; 849 } 850 851 nvsp_packet = hv_pkt_data(desc); 852 switch (nvsp_packet->hdr.msg_type) { 853 case NVSP_MSG_TYPE_INIT_COMPLETE: 854 if (msglen < sizeof(struct nvsp_message_header) + 855 sizeof(struct nvsp_message_init_complete)) { 856 netdev_err(ndev, "nvsp_msg length too small: %u\n", 857 msglen); 858 return; 859 } 860 break; 861 862 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: 863 if (msglen < sizeof(struct nvsp_message_header) + 864 sizeof(struct nvsp_1_message_send_receive_buffer_complete)) { 865 netdev_err(ndev, "nvsp_msg1 length too small: %u\n", 866 msglen); 867 return; 868 } 869 break; 870 871 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: 872 if (msglen < sizeof(struct nvsp_message_header) + 873 sizeof(struct nvsp_1_message_send_send_buffer_complete)) { 874 netdev_err(ndev, "nvsp_msg1 length too small: %u\n", 875 msglen); 876 return; 877 } 878 break; 879 880 case NVSP_MSG5_TYPE_SUBCHANNEL: 881 if (msglen < sizeof(struct nvsp_message_header) + 882 sizeof(struct nvsp_5_subchannel_complete)) { 883 netdev_err(ndev, "nvsp_msg5 length too small: %u\n", 884 msglen); 885 return; 886 } 887 break; 888 889 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: 890 if (msglen < sizeof(struct nvsp_message_header) + 891 sizeof(struct nvsp_1_message_send_rndis_packet_complete)) { 892 if (net_ratelimit()) 893 netdev_err(ndev, "nvsp_rndis_pkt_complete length too small: %u\n", 894 msglen); 895 return; 896 } 897 898 /* If status indicates an error, output a message so we know 899 * there's a problem. But process the completion anyway so the 900 * resources are released. 901 */ 902 status = nvsp_packet->msg.v1_msg.send_rndis_pkt_complete.status; 903 if (status != NVSP_STAT_SUCCESS && net_ratelimit()) 904 netdev_err(ndev, "nvsp_rndis_pkt_complete error status: %x\n", 905 status); 906 907 netvsc_send_tx_complete(ndev, net_device, incoming_channel, 908 desc, budget); 909 return; 910 911 default: 912 netdev_err(ndev, 913 "Unknown send completion type %d received!!\n", 914 nvsp_packet->hdr.msg_type); 915 return; 916 } 917 918 /* Copy the response back */ 919 memcpy(&net_device->channel_init_pkt, nvsp_packet, 920 sizeof(struct nvsp_message)); 921 complete(&net_device->channel_init_wait); 922} 923 924static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 925{ 926 unsigned long *map_addr = net_device->send_section_map; 927 unsigned int i; 928 929 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { 930 if (sync_test_and_set_bit(i, map_addr) == 0) 931 return i; 932 } 933 934 return NETVSC_INVALID_INDEX; 935} 936 937static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, 938 unsigned int section_index, 939 u32 pend_size, 940 struct hv_netvsc_packet *packet, 941 struct rndis_message *rndis_msg, 942 struct hv_page_buffer *pb, 943 bool xmit_more) 944{ 945 char *start = net_device->send_buf; 946 char *dest = start + (section_index * net_device->send_section_size) 947 + pend_size; 948 int i; 949 u32 padding = 0; 950 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 951 packet->page_buf_cnt; 952 u32 remain; 953 954 /* Add padding */ 955 remain = packet->total_data_buflen & (net_device->pkt_align - 1); 956 if (xmit_more && remain) { 957 padding = net_device->pkt_align - remain; 958 rndis_msg->msg_len += padding; 959 packet->total_data_buflen += padding; 960 } 961 962 for (i = 0; i < page_count; i++) { 963 char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT); 964 u32 offset = pb[i].offset; 965 u32 len = pb[i].len; 966 967 memcpy(dest, (src + offset), len); 968 dest += len; 969 } 970 971 if (padding) 972 memset(dest, 0, padding); 973} 974 975void netvsc_dma_unmap(struct hv_device *hv_dev, 976 struct hv_netvsc_packet *packet) 977{ 978 int i; 979 980 if (!hv_is_isolation_supported()) 981 return; 982 983 if (!packet->dma_range) 984 return; 985 986 for (i = 0; i < packet->page_buf_cnt; i++) 987 dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma, 988 packet->dma_range[i].mapping_size, 989 DMA_TO_DEVICE); 990 991 kfree(packet->dma_range); 992} 993 994/* netvsc_dma_map - Map swiotlb bounce buffer with data page of 995 * packet sent by vmbus_sendpacket_pagebuffer() in the Isolation 996 * VM. 997 * 998 * In isolation VM, netvsc send buffer has been marked visible to 999 * host and so the data copied to send buffer doesn't need to use 1000 * bounce buffer. The data pages handled by vmbus_sendpacket_pagebuffer() 1001 * may not be copied to send buffer and so these pages need to be 1002 * mapped with swiotlb bounce buffer. netvsc_dma_map() is to do 1003 * that. The pfns in the struct hv_page_buffer need to be converted 1004 * to bounce buffer's pfn. The loop here is necessary because the 1005 * entries in the page buffer array are not necessarily full 1006 * pages of data. Each entry in the array has a separate offset and 1007 * len that may be non-zero, even for entries in the middle of the 1008 * array. And the entries are not physically contiguous. So each 1009 * entry must be individually mapped rather than as a contiguous unit. 1010 * So not use dma_map_sg() here. 1011 */ 1012static int netvsc_dma_map(struct hv_device *hv_dev, 1013 struct hv_netvsc_packet *packet, 1014 struct hv_page_buffer *pb) 1015{ 1016 u32 page_count = packet->page_buf_cnt; 1017 dma_addr_t dma; 1018 int i; 1019 1020 if (!hv_is_isolation_supported()) 1021 return 0; 1022 1023 packet->dma_range = kcalloc(page_count, 1024 sizeof(*packet->dma_range), 1025 GFP_ATOMIC); 1026 if (!packet->dma_range) 1027 return -ENOMEM; 1028 1029 for (i = 0; i < page_count; i++) { 1030 char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT) 1031 + pb[i].offset); 1032 u32 len = pb[i].len; 1033 1034 dma = dma_map_single(&hv_dev->device, src, len, 1035 DMA_TO_DEVICE); 1036 if (dma_mapping_error(&hv_dev->device, dma)) { 1037 kfree(packet->dma_range); 1038 return -ENOMEM; 1039 } 1040 1041 /* pb[].offset and pb[].len are not changed during dma mapping 1042 * and so not reassign. 1043 */ 1044 packet->dma_range[i].dma = dma; 1045 packet->dma_range[i].mapping_size = len; 1046 pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT; 1047 } 1048 1049 return 0; 1050} 1051 1052static inline int netvsc_send_pkt( 1053 struct hv_device *device, 1054 struct hv_netvsc_packet *packet, 1055 struct netvsc_device *net_device, 1056 struct hv_page_buffer *pb, 1057 struct sk_buff *skb) 1058{ 1059 struct nvsp_message nvmsg; 1060 struct nvsp_1_message_send_rndis_packet *rpkt = 1061 &nvmsg.msg.v1_msg.send_rndis_pkt; 1062 struct netvsc_channel * const nvchan = 1063 &net_device->chan_table[packet->q_idx]; 1064 struct vmbus_channel *out_channel = nvchan->channel; 1065 struct net_device *ndev = hv_get_drvdata(device); 1066 struct net_device_context *ndev_ctx = netdev_priv(ndev); 1067 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); 1068 u64 req_id; 1069 int ret; 1070 u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound); 1071 1072 memset(&nvmsg, 0, sizeof(struct nvsp_message)); 1073 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 1074 if (skb) 1075 rpkt->channel_type = 0; /* 0 is RMC_DATA */ 1076 else 1077 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */ 1078 1079 rpkt->send_buf_section_index = packet->send_buf_index; 1080 if (packet->send_buf_index == NETVSC_INVALID_INDEX) 1081 rpkt->send_buf_section_size = 0; 1082 else 1083 rpkt->send_buf_section_size = packet->total_data_buflen; 1084 1085 req_id = (ulong)skb; 1086 1087 if (out_channel->rescind) 1088 return -ENODEV; 1089 1090 trace_nvsp_send_pkt(ndev, out_channel, rpkt); 1091 1092 packet->dma_range = NULL; 1093 if (packet->page_buf_cnt) { 1094 if (packet->cp_partial) 1095 pb += packet->rmsg_pgcnt; 1096 1097 ret = netvsc_dma_map(ndev_ctx->device_ctx, packet, pb); 1098 if (ret) { 1099 ret = -EAGAIN; 1100 goto exit; 1101 } 1102 1103 ret = vmbus_sendpacket_pagebuffer(out_channel, 1104 pb, packet->page_buf_cnt, 1105 &nvmsg, sizeof(nvmsg), 1106 req_id); 1107 1108 if (ret) 1109 netvsc_dma_unmap(ndev_ctx->device_ctx, packet); 1110 } else { 1111 ret = vmbus_sendpacket(out_channel, 1112 &nvmsg, sizeof(nvmsg), 1113 req_id, VM_PKT_DATA_INBAND, 1114 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 1115 } 1116 1117exit: 1118 if (ret == 0) { 1119 atomic_inc_return(&nvchan->queue_sends); 1120 1121 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { 1122 netif_tx_stop_queue(txq); 1123 ndev_ctx->eth_stats.stop_queue++; 1124 } 1125 } else if (ret == -EAGAIN) { 1126 netif_tx_stop_queue(txq); 1127 ndev_ctx->eth_stats.stop_queue++; 1128 } else { 1129 netdev_err(ndev, 1130 "Unable to send packet pages %u len %u, ret %d\n", 1131 packet->page_buf_cnt, packet->total_data_buflen, 1132 ret); 1133 } 1134 1135 if (netif_tx_queue_stopped(txq) && 1136 atomic_read(&nvchan->queue_sends) < 1 && 1137 !net_device->tx_disable) { 1138 netif_tx_wake_queue(txq); 1139 ndev_ctx->eth_stats.wake_queue++; 1140 if (ret == -EAGAIN) 1141 ret = -ENOSPC; 1142 } 1143 1144 return ret; 1145} 1146 1147/* Move packet out of multi send data (msd), and clear msd */ 1148static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, 1149 struct sk_buff **msd_skb, 1150 struct multi_send_data *msdp) 1151{ 1152 *msd_skb = msdp->skb; 1153 *msd_send = msdp->pkt; 1154 msdp->skb = NULL; 1155 msdp->pkt = NULL; 1156 msdp->count = 0; 1157} 1158 1159/* RCU already held by caller */ 1160/* Batching/bouncing logic is designed to attempt to optimize 1161 * performance. 1162 * 1163 * For small, non-LSO packets we copy the packet to a send buffer 1164 * which is pre-registered with the Hyper-V side. This enables the 1165 * hypervisor to avoid remapping the aperture to access the packet 1166 * descriptor and data. 1167 * 1168 * If we already started using a buffer and the netdev is transmitting 1169 * a burst of packets, keep on copying into the buffer until it is 1170 * full or we are done collecting a burst. If there is an existing 1171 * buffer with space for the RNDIS descriptor but not the packet, copy 1172 * the RNDIS descriptor to the buffer, keeping the packet in place. 1173 * 1174 * If we do batching and send more than one packet using a single 1175 * NetVSC message, free the SKBs of the packets copied, except for the 1176 * last packet. This is done to streamline the handling of the case 1177 * where the last packet only had the RNDIS descriptor copied to the 1178 * send buffer, with the data pointers included in the NetVSC message. 1179 */ 1180int netvsc_send(struct net_device *ndev, 1181 struct hv_netvsc_packet *packet, 1182 struct rndis_message *rndis_msg, 1183 struct hv_page_buffer *pb, 1184 struct sk_buff *skb, 1185 bool xdp_tx) 1186{ 1187 struct net_device_context *ndev_ctx = netdev_priv(ndev); 1188 struct netvsc_device *net_device 1189 = rcu_dereference_bh(ndev_ctx->nvdev); 1190 struct hv_device *device = ndev_ctx->device_ctx; 1191 int ret = 0; 1192 struct netvsc_channel *nvchan; 1193 u32 pktlen = packet->total_data_buflen, msd_len = 0; 1194 unsigned int section_index = NETVSC_INVALID_INDEX; 1195 struct multi_send_data *msdp; 1196 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 1197 struct sk_buff *msd_skb = NULL; 1198 bool try_batch, xmit_more; 1199 1200 /* If device is rescinded, return error and packet will get dropped. */ 1201 if (unlikely(!net_device || net_device->destroy)) 1202 return -ENODEV; 1203 1204 nvchan = &net_device->chan_table[packet->q_idx]; 1205 packet->send_buf_index = NETVSC_INVALID_INDEX; 1206 packet->cp_partial = false; 1207 1208 /* Send a control message or XDP packet directly without accessing 1209 * msd (Multi-Send Data) field which may be changed during data packet 1210 * processing. 1211 */ 1212 if (!skb || xdp_tx) 1213 return netvsc_send_pkt(device, packet, net_device, pb, skb); 1214 1215 /* batch packets in send buffer if possible */ 1216 msdp = &nvchan->msd; 1217 if (msdp->pkt) 1218 msd_len = msdp->pkt->total_data_buflen; 1219 1220 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; 1221 if (try_batch && msd_len + pktlen + net_device->pkt_align < 1222 net_device->send_section_size) { 1223 section_index = msdp->pkt->send_buf_index; 1224 1225 } else if (try_batch && msd_len + packet->rmsg_size < 1226 net_device->send_section_size) { 1227 section_index = msdp->pkt->send_buf_index; 1228 packet->cp_partial = true; 1229 1230 } else if (pktlen + net_device->pkt_align < 1231 net_device->send_section_size) { 1232 section_index = netvsc_get_next_send_section(net_device); 1233 if (unlikely(section_index == NETVSC_INVALID_INDEX)) { 1234 ++ndev_ctx->eth_stats.tx_send_full; 1235 } else { 1236 move_pkt_msd(&msd_send, &msd_skb, msdp); 1237 msd_len = 0; 1238 } 1239 } 1240 1241 /* Keep aggregating only if stack says more data is coming 1242 * and not doing mixed modes send and not flow blocked 1243 */ 1244 xmit_more = netdev_xmit_more() && 1245 !packet->cp_partial && 1246 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); 1247 1248 if (section_index != NETVSC_INVALID_INDEX) { 1249 netvsc_copy_to_send_buf(net_device, 1250 section_index, msd_len, 1251 packet, rndis_msg, pb, xmit_more); 1252 1253 packet->send_buf_index = section_index; 1254 1255 if (packet->cp_partial) { 1256 packet->page_buf_cnt -= packet->rmsg_pgcnt; 1257 packet->total_data_buflen = msd_len + packet->rmsg_size; 1258 } else { 1259 packet->page_buf_cnt = 0; 1260 packet->total_data_buflen += msd_len; 1261 } 1262 1263 if (msdp->pkt) { 1264 packet->total_packets += msdp->pkt->total_packets; 1265 packet->total_bytes += msdp->pkt->total_bytes; 1266 } 1267 1268 if (msdp->skb) 1269 dev_consume_skb_any(msdp->skb); 1270 1271 if (xmit_more) { 1272 msdp->skb = skb; 1273 msdp->pkt = packet; 1274 msdp->count++; 1275 } else { 1276 cur_send = packet; 1277 msdp->skb = NULL; 1278 msdp->pkt = NULL; 1279 msdp->count = 0; 1280 } 1281 } else { 1282 move_pkt_msd(&msd_send, &msd_skb, msdp); 1283 cur_send = packet; 1284 } 1285 1286 if (msd_send) { 1287 int m_ret = netvsc_send_pkt(device, msd_send, net_device, 1288 NULL, msd_skb); 1289 1290 if (m_ret != 0) { 1291 netvsc_free_send_slot(net_device, 1292 msd_send->send_buf_index); 1293 dev_kfree_skb_any(msd_skb); 1294 } 1295 } 1296 1297 if (cur_send) 1298 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); 1299 1300 if (ret != 0 && section_index != NETVSC_INVALID_INDEX) 1301 netvsc_free_send_slot(net_device, section_index); 1302 1303 return ret; 1304} 1305 1306/* Send pending recv completions */ 1307static int send_recv_completions(struct net_device *ndev, 1308 struct netvsc_device *nvdev, 1309 struct netvsc_channel *nvchan) 1310{ 1311 struct multi_recv_comp *mrc = &nvchan->mrc; 1312 struct recv_comp_msg { 1313 struct nvsp_message_header hdr; 1314 u32 status; 1315 } __packed; 1316 struct recv_comp_msg msg = { 1317 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, 1318 }; 1319 int ret; 1320 1321 while (mrc->first != mrc->next) { 1322 const struct recv_comp_data *rcd 1323 = mrc->slots + mrc->first; 1324 1325 msg.status = rcd->status; 1326 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), 1327 rcd->tid, VM_PKT_COMP, 0); 1328 if (unlikely(ret)) { 1329 struct net_device_context *ndev_ctx = netdev_priv(ndev); 1330 1331 ++ndev_ctx->eth_stats.rx_comp_busy; 1332 return ret; 1333 } 1334 1335 if (++mrc->first == nvdev->recv_completion_cnt) 1336 mrc->first = 0; 1337 } 1338 1339 /* receive completion ring has been emptied */ 1340 if (unlikely(nvdev->destroy)) 1341 wake_up(&nvdev->wait_drain); 1342 1343 return 0; 1344} 1345 1346/* Count how many receive completions are outstanding */ 1347static void recv_comp_slot_avail(const struct netvsc_device *nvdev, 1348 const struct multi_recv_comp *mrc, 1349 u32 *filled, u32 *avail) 1350{ 1351 u32 count = nvdev->recv_completion_cnt; 1352 1353 if (mrc->next >= mrc->first) 1354 *filled = mrc->next - mrc->first; 1355 else 1356 *filled = (count - mrc->first) + mrc->next; 1357 1358 *avail = count - *filled - 1; 1359} 1360 1361/* Add receive complete to ring to send to host. */ 1362static void enq_receive_complete(struct net_device *ndev, 1363 struct netvsc_device *nvdev, u16 q_idx, 1364 u64 tid, u32 status) 1365{ 1366 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; 1367 struct multi_recv_comp *mrc = &nvchan->mrc; 1368 struct recv_comp_data *rcd; 1369 u32 filled, avail; 1370 1371 recv_comp_slot_avail(nvdev, mrc, &filled, &avail); 1372 1373 if (unlikely(filled > NAPI_POLL_WEIGHT)) { 1374 send_recv_completions(ndev, nvdev, nvchan); 1375 recv_comp_slot_avail(nvdev, mrc, &filled, &avail); 1376 } 1377 1378 if (unlikely(!avail)) { 1379 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", 1380 q_idx, tid); 1381 return; 1382 } 1383 1384 rcd = mrc->slots + mrc->next; 1385 rcd->tid = tid; 1386 rcd->status = status; 1387 1388 if (++mrc->next == nvdev->recv_completion_cnt) 1389 mrc->next = 0; 1390} 1391 1392static int netvsc_receive(struct net_device *ndev, 1393 struct netvsc_device *net_device, 1394 struct netvsc_channel *nvchan, 1395 const struct vmpacket_descriptor *desc) 1396{ 1397 struct net_device_context *net_device_ctx = netdev_priv(ndev); 1398 struct vmbus_channel *channel = nvchan->channel; 1399 const struct vmtransfer_page_packet_header *vmxferpage_packet 1400 = container_of(desc, const struct vmtransfer_page_packet_header, d); 1401 const struct nvsp_message *nvsp = hv_pkt_data(desc); 1402 u32 msglen = hv_pkt_datalen(desc); 1403 u16 q_idx = channel->offermsg.offer.sub_channel_index; 1404 char *recv_buf = net_device->recv_buf; 1405 u32 status = NVSP_STAT_SUCCESS; 1406 int i; 1407 int count = 0; 1408 1409 /* Ensure packet is big enough to read header fields */ 1410 if (msglen < sizeof(struct nvsp_message_header)) { 1411 netif_err(net_device_ctx, rx_err, ndev, 1412 "invalid nvsp header, length too small: %u\n", 1413 msglen); 1414 return 0; 1415 } 1416 1417 /* Make sure this is a valid nvsp packet */ 1418 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { 1419 netif_err(net_device_ctx, rx_err, ndev, 1420 "Unknown nvsp packet type received %u\n", 1421 nvsp->hdr.msg_type); 1422 return 0; 1423 } 1424 1425 /* Validate xfer page pkt header */ 1426 if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) { 1427 netif_err(net_device_ctx, rx_err, ndev, 1428 "Invalid xfer page pkt, offset too small: %u\n", 1429 desc->offset8 << 3); 1430 return 0; 1431 } 1432 1433 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { 1434 netif_err(net_device_ctx, rx_err, ndev, 1435 "Invalid xfer page set id - expecting %x got %x\n", 1436 NETVSC_RECEIVE_BUFFER_ID, 1437 vmxferpage_packet->xfer_pageset_id); 1438 return 0; 1439 } 1440 1441 count = vmxferpage_packet->range_cnt; 1442 1443 /* Check count for a valid value */ 1444 if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) { 1445 netif_err(net_device_ctx, rx_err, ndev, 1446 "Range count is not valid: %d\n", 1447 count); 1448 return 0; 1449 } 1450 1451 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 1452 for (i = 0; i < count; i++) { 1453 u32 offset = vmxferpage_packet->ranges[i].byte_offset; 1454 u32 buflen = vmxferpage_packet->ranges[i].byte_count; 1455 void *data; 1456 int ret; 1457 1458 if (unlikely(offset > net_device->recv_buf_size || 1459 buflen > net_device->recv_buf_size - offset)) { 1460 nvchan->rsc.cnt = 0; 1461 status = NVSP_STAT_FAIL; 1462 netif_err(net_device_ctx, rx_err, ndev, 1463 "Packet offset:%u + len:%u too big\n", 1464 offset, buflen); 1465 1466 continue; 1467 } 1468 1469 /* We're going to copy (sections of) the packet into nvchan->recv_buf; 1470 * make sure that nvchan->recv_buf is large enough to hold the packet. 1471 */ 1472 if (unlikely(buflen > net_device->recv_section_size)) { 1473 nvchan->rsc.cnt = 0; 1474 status = NVSP_STAT_FAIL; 1475 netif_err(net_device_ctx, rx_err, ndev, 1476 "Packet too big: buflen=%u recv_section_size=%u\n", 1477 buflen, net_device->recv_section_size); 1478 1479 continue; 1480 } 1481 1482 data = recv_buf + offset; 1483 1484 nvchan->rsc.is_last = (i == count - 1); 1485 1486 trace_rndis_recv(ndev, q_idx, data); 1487 1488 /* Pass it to the upper layer */ 1489 ret = rndis_filter_receive(ndev, net_device, 1490 nvchan, data, buflen); 1491 1492 if (unlikely(ret != NVSP_STAT_SUCCESS)) { 1493 /* Drop incomplete packet */ 1494 nvchan->rsc.cnt = 0; 1495 status = NVSP_STAT_FAIL; 1496 } 1497 } 1498 1499 enq_receive_complete(ndev, net_device, q_idx, 1500 vmxferpage_packet->d.trans_id, status); 1501 1502 return count; 1503} 1504 1505static void netvsc_send_table(struct net_device *ndev, 1506 struct netvsc_device *nvscdev, 1507 const struct nvsp_message *nvmsg, 1508 u32 msglen) 1509{ 1510 struct net_device_context *net_device_ctx = netdev_priv(ndev); 1511 u32 count, offset, *tab; 1512 int i; 1513 1514 /* Ensure packet is big enough to read send_table fields */ 1515 if (msglen < sizeof(struct nvsp_message_header) + 1516 sizeof(struct nvsp_5_send_indirect_table)) { 1517 netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen); 1518 return; 1519 } 1520 1521 count = nvmsg->msg.v5_msg.send_table.count; 1522 offset = nvmsg->msg.v5_msg.send_table.offset; 1523 1524 if (count != VRSS_SEND_TAB_SIZE) { 1525 netdev_err(ndev, "Received wrong send-table size:%u\n", count); 1526 return; 1527 } 1528 1529 /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be 1530 * wrong due to a host bug. So fix the offset here. 1531 */ 1532 if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 && 1533 msglen >= sizeof(struct nvsp_message_header) + 1534 sizeof(union nvsp_6_message_uber) + count * sizeof(u32)) 1535 offset = sizeof(struct nvsp_message_header) + 1536 sizeof(union nvsp_6_message_uber); 1537 1538 /* Boundary check for all versions */ 1539 if (msglen < count * sizeof(u32) || offset > msglen - count * sizeof(u32)) { 1540 netdev_err(ndev, "Received send-table offset too big:%u\n", 1541 offset); 1542 return; 1543 } 1544 1545 tab = (void *)nvmsg + offset; 1546 1547 for (i = 0; i < count; i++) 1548 net_device_ctx->tx_table[i] = tab[i]; 1549} 1550 1551static void netvsc_send_vf(struct net_device *ndev, 1552 const struct nvsp_message *nvmsg, 1553 u32 msglen) 1554{ 1555 struct net_device_context *net_device_ctx = netdev_priv(ndev); 1556 1557 /* Ensure packet is big enough to read its fields */ 1558 if (msglen < sizeof(struct nvsp_message_header) + 1559 sizeof(struct nvsp_4_send_vf_association)) { 1560 netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen); 1561 return; 1562 } 1563 1564 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; 1565 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; 1566 1567 if (net_device_ctx->vf_alloc) 1568 complete(&net_device_ctx->vf_add); 1569 1570 netdev_info(ndev, "VF slot %u %s\n", 1571 net_device_ctx->vf_serial, 1572 net_device_ctx->vf_alloc ? "added" : "removed"); 1573} 1574 1575static void netvsc_receive_inband(struct net_device *ndev, 1576 struct netvsc_device *nvscdev, 1577 const struct vmpacket_descriptor *desc) 1578{ 1579 const struct nvsp_message *nvmsg = hv_pkt_data(desc); 1580 u32 msglen = hv_pkt_datalen(desc); 1581 1582 /* Ensure packet is big enough to read header fields */ 1583 if (msglen < sizeof(struct nvsp_message_header)) { 1584 netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen); 1585 return; 1586 } 1587 1588 switch (nvmsg->hdr.msg_type) { 1589 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: 1590 netvsc_send_table(ndev, nvscdev, nvmsg, msglen); 1591 break; 1592 1593 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: 1594 if (hv_is_isolation_supported()) 1595 netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n"); 1596 else 1597 netvsc_send_vf(ndev, nvmsg, msglen); 1598 break; 1599 } 1600} 1601 1602static int netvsc_process_raw_pkt(struct hv_device *device, 1603 struct netvsc_channel *nvchan, 1604 struct netvsc_device *net_device, 1605 struct net_device *ndev, 1606 const struct vmpacket_descriptor *desc, 1607 int budget) 1608{ 1609 struct vmbus_channel *channel = nvchan->channel; 1610 const struct nvsp_message *nvmsg = hv_pkt_data(desc); 1611 1612 trace_nvsp_recv(ndev, channel, nvmsg); 1613 1614 switch (desc->type) { 1615 case VM_PKT_COMP: 1616 netvsc_send_completion(ndev, net_device, channel, desc, budget); 1617 break; 1618 1619 case VM_PKT_DATA_USING_XFER_PAGES: 1620 return netvsc_receive(ndev, net_device, nvchan, desc); 1621 1622 case VM_PKT_DATA_INBAND: 1623 netvsc_receive_inband(ndev, net_device, desc); 1624 break; 1625 1626 default: 1627 netdev_err(ndev, "unhandled packet type %d, tid %llx\n", 1628 desc->type, desc->trans_id); 1629 break; 1630 } 1631 1632 return 0; 1633} 1634 1635static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) 1636{ 1637 struct vmbus_channel *primary = channel->primary_channel; 1638 1639 return primary ? primary->device_obj : channel->device_obj; 1640} 1641 1642/* Network processing softirq 1643 * Process data in incoming ring buffer from host 1644 * Stops when ring is empty or budget is met or exceeded. 1645 */ 1646int netvsc_poll(struct napi_struct *napi, int budget) 1647{ 1648 struct netvsc_channel *nvchan 1649 = container_of(napi, struct netvsc_channel, napi); 1650 struct netvsc_device *net_device = nvchan->net_device; 1651 struct vmbus_channel *channel = nvchan->channel; 1652 struct hv_device *device = netvsc_channel_to_device(channel); 1653 struct net_device *ndev = hv_get_drvdata(device); 1654 int work_done = 0; 1655 int ret; 1656 1657 /* If starting a new interval */ 1658 if (!nvchan->desc) 1659 nvchan->desc = hv_pkt_iter_first(channel); 1660 1661 nvchan->xdp_flush = false; 1662 1663 while (nvchan->desc && work_done < budget) { 1664 work_done += netvsc_process_raw_pkt(device, nvchan, net_device, 1665 ndev, nvchan->desc, budget); 1666 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); 1667 } 1668 1669 if (nvchan->xdp_flush) 1670 xdp_do_flush(); 1671 1672 /* Send any pending receive completions */ 1673 ret = send_recv_completions(ndev, net_device, nvchan); 1674 1675 /* If it did not exhaust NAPI budget this time 1676 * and not doing busy poll 1677 * then re-enable host interrupts 1678 * and reschedule if ring is not empty 1679 * or sending receive completion failed. 1680 */ 1681 if (work_done < budget && 1682 napi_complete_done(napi, work_done) && 1683 (ret || hv_end_read(&channel->inbound)) && 1684 napi_schedule_prep(napi)) { 1685 hv_begin_read(&channel->inbound); 1686 __napi_schedule(napi); 1687 } 1688 1689 /* Driver may overshoot since multiple packets per descriptor */ 1690 return min(work_done, budget); 1691} 1692 1693/* Call back when data is available in host ring buffer. 1694 * Processing is deferred until network softirq (NAPI) 1695 */ 1696void netvsc_channel_cb(void *context) 1697{ 1698 struct netvsc_channel *nvchan = context; 1699 struct vmbus_channel *channel = nvchan->channel; 1700 struct hv_ring_buffer_info *rbi = &channel->inbound; 1701 1702 /* preload first vmpacket descriptor */ 1703 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); 1704 1705 if (napi_schedule_prep(&nvchan->napi)) { 1706 /* disable interrupts from host */ 1707 hv_begin_read(rbi); 1708 1709 __napi_schedule_irqoff(&nvchan->napi); 1710 } 1711} 1712 1713/* 1714 * netvsc_device_add - Callback when the device belonging to this 1715 * driver is added 1716 */ 1717struct netvsc_device *netvsc_device_add(struct hv_device *device, 1718 const struct netvsc_device_info *device_info) 1719{ 1720 int i, ret = 0; 1721 struct netvsc_device *net_device; 1722 struct net_device *ndev = hv_get_drvdata(device); 1723 struct net_device_context *net_device_ctx = netdev_priv(ndev); 1724 1725 net_device = alloc_net_device(); 1726 if (!net_device) 1727 return ERR_PTR(-ENOMEM); 1728 1729 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++) 1730 net_device_ctx->tx_table[i] = 0; 1731 1732 /* Because the device uses NAPI, all the interrupt batching and 1733 * control is done via Net softirq, not the channel handling 1734 */ 1735 set_channel_read_mode(device->channel, HV_CALL_ISR); 1736 1737 /* If we're reopening the device we may have multiple queues, fill the 1738 * chn_table with the default channel to use it before subchannels are 1739 * opened. 1740 * Initialize the channel state before we open; 1741 * we can be interrupted as soon as we open the channel. 1742 */ 1743 1744 for (i = 0; i < VRSS_CHANNEL_MAX; i++) { 1745 struct netvsc_channel *nvchan = &net_device->chan_table[i]; 1746 1747 nvchan->channel = device->channel; 1748 nvchan->net_device = net_device; 1749 u64_stats_init(&nvchan->tx_stats.syncp); 1750 u64_stats_init(&nvchan->rx_stats.syncp); 1751 1752 ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0); 1753 1754 if (ret) { 1755 netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret); 1756 goto cleanup2; 1757 } 1758 1759 ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq, 1760 MEM_TYPE_PAGE_SHARED, NULL); 1761 1762 if (ret) { 1763 netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret); 1764 goto cleanup2; 1765 } 1766 } 1767 1768 /* Enable NAPI handler before init callbacks */ 1769 netif_napi_add(ndev, &net_device->chan_table[0].napi, netvsc_poll); 1770 1771 /* Open the channel */ 1772 device->channel->next_request_id_callback = vmbus_next_request_id; 1773 device->channel->request_addr_callback = vmbus_request_addr; 1774 device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes); 1775 device->channel->max_pkt_size = NETVSC_MAX_PKT_SIZE; 1776 1777 ret = vmbus_open(device->channel, netvsc_ring_bytes, 1778 netvsc_ring_bytes, NULL, 0, 1779 netvsc_channel_cb, net_device->chan_table); 1780 1781 if (ret != 0) { 1782 netdev_err(ndev, "unable to open channel: %d\n", ret); 1783 goto cleanup; 1784 } 1785 1786 /* Channel is opened */ 1787 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); 1788 1789 napi_enable(&net_device->chan_table[0].napi); 1790 1791 /* Connect with the NetVsp */ 1792 ret = netvsc_connect_vsp(device, net_device, device_info); 1793 if (ret != 0) { 1794 netdev_err(ndev, 1795 "unable to connect to NetVSP - %d\n", ret); 1796 goto close; 1797 } 1798 1799 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is 1800 * populated. 1801 */ 1802 rcu_assign_pointer(net_device_ctx->nvdev, net_device); 1803 1804 return net_device; 1805 1806close: 1807 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); 1808 napi_disable(&net_device->chan_table[0].napi); 1809 1810 /* Now, we can close the channel safely */ 1811 vmbus_close(device->channel); 1812 1813cleanup: 1814 netif_napi_del(&net_device->chan_table[0].napi); 1815 1816cleanup2: 1817 free_netvsc_device(&net_device->rcu); 1818 1819 return ERR_PTR(ret); 1820} 1821