1 /* 2 * An implementation of key value pair (KVP) functionality for Linux. 3 * 4 * 5 * Copyright (C) 2010, Novell, Inc. 6 * Author : K. Y. Srinivasan <ksrinivasan@novell.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 as published 10 * by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 15 * NON INFRINGEMENT. See the GNU General Public License for more 16 * details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 */ 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #include <linux/net.h> 26 #include <linux/nls.h> 27 #include <linux/connector.h> 28 #include <linux/workqueue.h> 29 #include <linux/hyperv.h> 30 31 #include "hyperv_vmbus.h" 32 #include "hv_utils_transport.h" 33 34 /* 35 * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7) 36 */ 37 #define WS2008_SRV_MAJOR 1 38 #define WS2008_SRV_MINOR 0 39 #define WS2008_SRV_VERSION (WS2008_SRV_MAJOR << 16 | WS2008_SRV_MINOR) 40 41 #define WIN7_SRV_MAJOR 3 42 #define WIN7_SRV_MINOR 0 43 #define WIN7_SRV_VERSION (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR) 44 45 #define WIN8_SRV_MAJOR 4 46 #define WIN8_SRV_MINOR 0 47 #define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR) 48 49 /* 50 * Global state maintained for transaction that is being processed. For a class 51 * of integration services, including the "KVP service", the specified protocol 52 * is a "request/response" protocol which means that there can only be single 53 * outstanding transaction from the host at any given point in time. We use 54 * this to simplify memory management in this driver - we cache and process 55 * only one message at a time. 56 * 57 * While the request/response protocol is guaranteed by the host, we further 58 * ensure this by serializing packet processing in this driver - we do not 59 * read additional packets from the VMBUs until the current packet is fully 60 * handled. 61 */ 62 63 static struct { 64 int state; /* hvutil_device_state */ 65 int recv_len; /* number of bytes received. */ 66 struct hv_kvp_msg *kvp_msg; /* current message */ 67 struct vmbus_channel *recv_channel; /* chn we got the request */ 68 u64 recv_req_id; /* request ID. */ 69 void *kvp_context; /* for the channel callback */ 70 } kvp_transaction; 71 72 /* 73 * This state maintains the version number registered by the daemon. 74 */ 75 static int dm_reg_value; 76 77 static void kvp_send_key(struct work_struct *dummy); 78 79 80 static void kvp_respond_to_host(struct hv_kvp_msg *msg, int error); 81 static void kvp_timeout_func(struct work_struct *dummy); 82 static void kvp_register(int); 83 84 static DECLARE_DELAYED_WORK(kvp_timeout_work, kvp_timeout_func); 85 static DECLARE_WORK(kvp_sendkey_work, kvp_send_key); 86 87 static const char kvp_devname[] = "vmbus/hv_kvp"; 88 static u8 *recv_buffer; 89 static struct hvutil_transport *hvt; 90 /* 91 * Register the kernel component with the user-level daemon. 92 * As part of this registration, pass the LIC version number. 93 * This number has no meaning, it satisfies the registration protocol. 94 */ 95 #define HV_DRV_VERSION "3.1" 96 97 static void 98 kvp_register(int reg_value) 99 { 100 101 struct hv_kvp_msg *kvp_msg; 102 char *version; 103 104 kvp_msg = kzalloc(sizeof(*kvp_msg), GFP_KERNEL); 105 106 if (kvp_msg) { 107 version = kvp_msg->body.kvp_register.version; 108 kvp_msg->kvp_hdr.operation = reg_value; 109 strcpy(version, HV_DRV_VERSION); 110 111 hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg)); 112 kfree(kvp_msg); 113 } 114 } 115 116 static void kvp_timeout_func(struct work_struct *dummy) 117 { 118 /* 119 * If the timer fires, the user-mode component has not responded; 120 * process the pending transaction. 121 */ 122 kvp_respond_to_host(NULL, HV_E_FAIL); 123 124 /* Transaction is finished, reset the state. */ 125 if (kvp_transaction.state > HVUTIL_READY) 126 kvp_transaction.state = HVUTIL_READY; 127 128 hv_poll_channel(kvp_transaction.kvp_context, 129 hv_kvp_onchannelcallback); 130 } 131 132 static int kvp_handle_handshake(struct hv_kvp_msg *msg) 133 { 134 switch (msg->kvp_hdr.operation) { 135 case KVP_OP_REGISTER: 136 dm_reg_value = KVP_OP_REGISTER; 137 pr_info("KVP: IP injection functionality not available\n"); 138 pr_info("KVP: Upgrade the KVP daemon\n"); 139 break; 140 case KVP_OP_REGISTER1: 141 dm_reg_value = KVP_OP_REGISTER1; 142 break; 143 default: 144 pr_info("KVP: incompatible daemon\n"); 145 pr_info("KVP: KVP version: %d, Daemon version: %d\n", 146 KVP_OP_REGISTER1, msg->kvp_hdr.operation); 147 return -EINVAL; 148 } 149 150 /* 151 * We have a compatible daemon; complete the handshake. 152 */ 153 pr_debug("KVP: userspace daemon ver. %d registered\n", 154 KVP_OP_REGISTER); 155 kvp_register(dm_reg_value); 156 kvp_transaction.state = HVUTIL_READY; 157 158 return 0; 159 } 160 161 162 /* 163 * Callback when data is received from user mode. 164 */ 165 166 static int kvp_on_msg(void *msg, int len) 167 { 168 struct hv_kvp_msg *message = (struct hv_kvp_msg *)msg; 169 struct hv_kvp_msg_enumerate *data; 170 int error = 0; 171 172 if (len < sizeof(*message)) 173 return -EINVAL; 174 175 /* 176 * If we are negotiating the version information 177 * with the daemon; handle that first. 178 */ 179 180 if (kvp_transaction.state < HVUTIL_READY) { 181 return kvp_handle_handshake(message); 182 } 183 184 /* We didn't send anything to userspace so the reply is spurious */ 185 if (kvp_transaction.state < HVUTIL_USERSPACE_REQ) 186 return -EINVAL; 187 188 kvp_transaction.state = HVUTIL_USERSPACE_RECV; 189 190 /* 191 * Based on the version of the daemon, we propagate errors from the 192 * daemon differently. 193 */ 194 195 data = &message->body.kvp_enum_data; 196 197 switch (dm_reg_value) { 198 case KVP_OP_REGISTER: 199 /* 200 * Null string is used to pass back error condition. 201 */ 202 if (data->data.key[0] == 0) 203 error = HV_S_CONT; 204 break; 205 206 case KVP_OP_REGISTER1: 207 /* 208 * We use the message header information from 209 * the user level daemon to transmit errors. 210 */ 211 error = message->error; 212 break; 213 } 214 215 /* 216 * Complete the transaction by forwarding the key value 217 * to the host. But first, cancel the timeout. 218 */ 219 if (cancel_delayed_work_sync(&kvp_timeout_work)) { 220 kvp_respond_to_host(message, error); 221 kvp_transaction.state = HVUTIL_READY; 222 hv_poll_channel(kvp_transaction.kvp_context, 223 hv_kvp_onchannelcallback); 224 } 225 226 return 0; 227 } 228 229 230 static int process_ob_ipinfo(void *in_msg, void *out_msg, int op) 231 { 232 struct hv_kvp_msg *in = in_msg; 233 struct hv_kvp_ip_msg *out = out_msg; 234 int len; 235 236 switch (op) { 237 case KVP_OP_GET_IP_INFO: 238 /* 239 * Transform all parameters into utf16 encoding. 240 */ 241 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.ip_addr, 242 strlen((char *)in->body.kvp_ip_val.ip_addr), 243 UTF16_HOST_ENDIAN, 244 (wchar_t *)out->kvp_ip_val.ip_addr, 245 MAX_IP_ADDR_SIZE); 246 if (len < 0) 247 return len; 248 249 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.sub_net, 250 strlen((char *)in->body.kvp_ip_val.sub_net), 251 UTF16_HOST_ENDIAN, 252 (wchar_t *)out->kvp_ip_val.sub_net, 253 MAX_IP_ADDR_SIZE); 254 if (len < 0) 255 return len; 256 257 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.gate_way, 258 strlen((char *)in->body.kvp_ip_val.gate_way), 259 UTF16_HOST_ENDIAN, 260 (wchar_t *)out->kvp_ip_val.gate_way, 261 MAX_GATEWAY_SIZE); 262 if (len < 0) 263 return len; 264 265 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.dns_addr, 266 strlen((char *)in->body.kvp_ip_val.dns_addr), 267 UTF16_HOST_ENDIAN, 268 (wchar_t *)out->kvp_ip_val.dns_addr, 269 MAX_IP_ADDR_SIZE); 270 if (len < 0) 271 return len; 272 273 len = utf8s_to_utf16s((char *)in->body.kvp_ip_val.adapter_id, 274 strlen((char *)in->body.kvp_ip_val.adapter_id), 275 UTF16_HOST_ENDIAN, 276 (wchar_t *)out->kvp_ip_val.adapter_id, 277 MAX_IP_ADDR_SIZE); 278 if (len < 0) 279 return len; 280 281 out->kvp_ip_val.dhcp_enabled = 282 in->body.kvp_ip_val.dhcp_enabled; 283 out->kvp_ip_val.addr_family = 284 in->body.kvp_ip_val.addr_family; 285 } 286 287 return 0; 288 } 289 290 static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) 291 { 292 struct hv_kvp_ip_msg *in = in_msg; 293 struct hv_kvp_msg *out = out_msg; 294 295 switch (op) { 296 case KVP_OP_SET_IP_INFO: 297 /* 298 * Transform all parameters into utf8 encoding. 299 */ 300 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.ip_addr, 301 MAX_IP_ADDR_SIZE, 302 UTF16_LITTLE_ENDIAN, 303 (__u8 *)out->body.kvp_ip_val.ip_addr, 304 MAX_IP_ADDR_SIZE); 305 306 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.sub_net, 307 MAX_IP_ADDR_SIZE, 308 UTF16_LITTLE_ENDIAN, 309 (__u8 *)out->body.kvp_ip_val.sub_net, 310 MAX_IP_ADDR_SIZE); 311 312 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.gate_way, 313 MAX_GATEWAY_SIZE, 314 UTF16_LITTLE_ENDIAN, 315 (__u8 *)out->body.kvp_ip_val.gate_way, 316 MAX_GATEWAY_SIZE); 317 318 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.dns_addr, 319 MAX_IP_ADDR_SIZE, 320 UTF16_LITTLE_ENDIAN, 321 (__u8 *)out->body.kvp_ip_val.dns_addr, 322 MAX_IP_ADDR_SIZE); 323 324 out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; 325 326 default: 327 utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, 328 MAX_ADAPTER_ID_SIZE, 329 UTF16_LITTLE_ENDIAN, 330 (__u8 *)out->body.kvp_ip_val.adapter_id, 331 MAX_ADAPTER_ID_SIZE); 332 333 out->body.kvp_ip_val.addr_family = in->kvp_ip_val.addr_family; 334 } 335 } 336 337 338 339 340 static void 341 kvp_send_key(struct work_struct *dummy) 342 { 343 struct hv_kvp_msg *message; 344 struct hv_kvp_msg *in_msg; 345 __u8 operation = kvp_transaction.kvp_msg->kvp_hdr.operation; 346 __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool; 347 __u32 val32; 348 __u64 val64; 349 int rc; 350 351 /* The transaction state is wrong. */ 352 if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED) 353 return; 354 355 message = kzalloc(sizeof(*message), GFP_KERNEL); 356 message->kvp_hdr.operation = operation; 357 message->kvp_hdr.pool = pool; 358 in_msg = kvp_transaction.kvp_msg; 359 360 /* 361 * The key/value strings sent from the host are encoded in 362 * in utf16; convert it to utf8 strings. 363 * The host assures us that the utf16 strings will not exceed 364 * the max lengths specified. We will however, reserve room 365 * for the string terminating character - in the utf16s_utf8s() 366 * function we limit the size of the buffer where the converted 367 * string is placed to HV_KVP_EXCHANGE_MAX_*_SIZE -1 to gaurantee 368 * that the strings can be properly terminated! 369 */ 370 371 switch (message->kvp_hdr.operation) { 372 case KVP_OP_SET_IP_INFO: 373 process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); 374 break; 375 case KVP_OP_GET_IP_INFO: 376 process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); 377 break; 378 case KVP_OP_SET: 379 switch (in_msg->body.kvp_set.data.value_type) { 380 case REG_SZ: 381 /* 382 * The value is a string - utf16 encoding. 383 */ 384 message->body.kvp_set.data.value_size = 385 utf16s_to_utf8s( 386 (wchar_t *)in_msg->body.kvp_set.data.value, 387 in_msg->body.kvp_set.data.value_size, 388 UTF16_LITTLE_ENDIAN, 389 message->body.kvp_set.data.value, 390 HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; 391 break; 392 393 case REG_U32: 394 /* 395 * The value is a 32 bit scalar. 396 * We save this as a utf8 string. 397 */ 398 val32 = in_msg->body.kvp_set.data.value_u32; 399 message->body.kvp_set.data.value_size = 400 sprintf(message->body.kvp_set.data.value, 401 "%d", val32) + 1; 402 break; 403 404 case REG_U64: 405 /* 406 * The value is a 64 bit scalar. 407 * We save this as a utf8 string. 408 */ 409 val64 = in_msg->body.kvp_set.data.value_u64; 410 message->body.kvp_set.data.value_size = 411 sprintf(message->body.kvp_set.data.value, 412 "%llu", val64) + 1; 413 break; 414 415 } 416 case KVP_OP_GET: 417 message->body.kvp_set.data.key_size = 418 utf16s_to_utf8s( 419 (wchar_t *)in_msg->body.kvp_set.data.key, 420 in_msg->body.kvp_set.data.key_size, 421 UTF16_LITTLE_ENDIAN, 422 message->body.kvp_set.data.key, 423 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; 424 break; 425 426 case KVP_OP_DELETE: 427 message->body.kvp_delete.key_size = 428 utf16s_to_utf8s( 429 (wchar_t *)in_msg->body.kvp_delete.key, 430 in_msg->body.kvp_delete.key_size, 431 UTF16_LITTLE_ENDIAN, 432 message->body.kvp_delete.key, 433 HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; 434 break; 435 436 case KVP_OP_ENUMERATE: 437 message->body.kvp_enum_data.index = 438 in_msg->body.kvp_enum_data.index; 439 break; 440 } 441 442 kvp_transaction.state = HVUTIL_USERSPACE_REQ; 443 rc = hvutil_transport_send(hvt, message, sizeof(*message)); 444 if (rc) { 445 pr_debug("KVP: failed to communicate to the daemon: %d\n", rc); 446 if (cancel_delayed_work_sync(&kvp_timeout_work)) { 447 kvp_respond_to_host(message, HV_E_FAIL); 448 kvp_transaction.state = HVUTIL_READY; 449 } 450 } 451 452 kfree(message); 453 454 return; 455 } 456 457 /* 458 * Send a response back to the host. 459 */ 460 461 static void 462 kvp_respond_to_host(struct hv_kvp_msg *msg_to_host, int error) 463 { 464 struct hv_kvp_msg *kvp_msg; 465 struct hv_kvp_exchg_msg_value *kvp_data; 466 char *key_name; 467 char *value; 468 struct icmsg_hdr *icmsghdrp; 469 int keylen = 0; 470 int valuelen = 0; 471 u32 buf_len; 472 struct vmbus_channel *channel; 473 u64 req_id; 474 int ret; 475 476 /* 477 * Copy the global state for completing the transaction. Note that 478 * only one transaction can be active at a time. 479 */ 480 481 buf_len = kvp_transaction.recv_len; 482 channel = kvp_transaction.recv_channel; 483 req_id = kvp_transaction.recv_req_id; 484 485 icmsghdrp = (struct icmsg_hdr *) 486 &recv_buffer[sizeof(struct vmbuspipe_hdr)]; 487 488 if (channel->onchannel_callback == NULL) 489 /* 490 * We have raced with util driver being unloaded; 491 * silently return. 492 */ 493 return; 494 495 icmsghdrp->status = error; 496 497 /* 498 * If the error parameter is set, terminate the host's enumeration 499 * on this pool. 500 */ 501 if (error) { 502 /* 503 * Something failed or we have timedout; 504 * terminate the current host-side iteration. 505 */ 506 goto response_done; 507 } 508 509 kvp_msg = (struct hv_kvp_msg *) 510 &recv_buffer[sizeof(struct vmbuspipe_hdr) + 511 sizeof(struct icmsg_hdr)]; 512 513 switch (kvp_transaction.kvp_msg->kvp_hdr.operation) { 514 case KVP_OP_GET_IP_INFO: 515 ret = process_ob_ipinfo(msg_to_host, 516 (struct hv_kvp_ip_msg *)kvp_msg, 517 KVP_OP_GET_IP_INFO); 518 if (ret < 0) 519 icmsghdrp->status = HV_E_FAIL; 520 521 goto response_done; 522 case KVP_OP_SET_IP_INFO: 523 goto response_done; 524 case KVP_OP_GET: 525 kvp_data = &kvp_msg->body.kvp_get.data; 526 goto copy_value; 527 528 case KVP_OP_SET: 529 case KVP_OP_DELETE: 530 goto response_done; 531 532 default: 533 break; 534 } 535 536 kvp_data = &kvp_msg->body.kvp_enum_data.data; 537 key_name = msg_to_host->body.kvp_enum_data.data.key; 538 539 /* 540 * The windows host expects the key/value pair to be encoded 541 * in utf16. Ensure that the key/value size reported to the host 542 * will be less than or equal to the MAX size (including the 543 * terminating character). 544 */ 545 keylen = utf8s_to_utf16s(key_name, strlen(key_name), UTF16_HOST_ENDIAN, 546 (wchar_t *) kvp_data->key, 547 (HV_KVP_EXCHANGE_MAX_KEY_SIZE / 2) - 2); 548 kvp_data->key_size = 2*(keylen + 1); /* utf16 encoding */ 549 550 copy_value: 551 value = msg_to_host->body.kvp_enum_data.data.value; 552 valuelen = utf8s_to_utf16s(value, strlen(value), UTF16_HOST_ENDIAN, 553 (wchar_t *) kvp_data->value, 554 (HV_KVP_EXCHANGE_MAX_VALUE_SIZE / 2) - 2); 555 kvp_data->value_size = 2*(valuelen + 1); /* utf16 encoding */ 556 557 /* 558 * If the utf8s to utf16s conversion failed; notify host 559 * of the error. 560 */ 561 if ((keylen < 0) || (valuelen < 0)) 562 icmsghdrp->status = HV_E_FAIL; 563 564 kvp_data->value_type = REG_SZ; /* all our values are strings */ 565 566 response_done: 567 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION | ICMSGHDRFLAG_RESPONSE; 568 569 vmbus_sendpacket(channel, recv_buffer, buf_len, req_id, 570 VM_PKT_DATA_INBAND, 0); 571 } 572 573 /* 574 * This callback is invoked when we get a KVP message from the host. 575 * The host ensures that only one KVP transaction can be active at a time. 576 * KVP implementation in Linux needs to forward the key to a user-mde 577 * component to retrive the corresponding value. Consequently, we cannot 578 * respond to the host in the conext of this callback. Since the host 579 * guarantees that at most only one transaction can be active at a time, 580 * we stash away the transaction state in a set of global variables. 581 */ 582 583 void hv_kvp_onchannelcallback(void *context) 584 { 585 struct vmbus_channel *channel = context; 586 u32 recvlen; 587 u64 requestid; 588 589 struct hv_kvp_msg *kvp_msg; 590 591 struct icmsg_hdr *icmsghdrp; 592 struct icmsg_negotiate *negop = NULL; 593 int util_fw_version; 594 int kvp_srv_version; 595 596 if (kvp_transaction.state > HVUTIL_READY) { 597 /* 598 * We will defer processing this callback once 599 * the current transaction is complete. 600 */ 601 kvp_transaction.kvp_context = context; 602 return; 603 } 604 kvp_transaction.kvp_context = NULL; 605 606 vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen, 607 &requestid); 608 609 if (recvlen > 0) { 610 icmsghdrp = (struct icmsg_hdr *)&recv_buffer[ 611 sizeof(struct vmbuspipe_hdr)]; 612 613 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { 614 /* 615 * Based on the host, select appropriate 616 * framework and service versions we will 617 * negotiate. 618 */ 619 switch (vmbus_proto_version) { 620 case (VERSION_WS2008): 621 util_fw_version = UTIL_WS2K8_FW_VERSION; 622 kvp_srv_version = WS2008_SRV_VERSION; 623 break; 624 case (VERSION_WIN7): 625 util_fw_version = UTIL_FW_VERSION; 626 kvp_srv_version = WIN7_SRV_VERSION; 627 break; 628 default: 629 util_fw_version = UTIL_FW_VERSION; 630 kvp_srv_version = WIN8_SRV_VERSION; 631 } 632 vmbus_prep_negotiate_resp(icmsghdrp, negop, 633 recv_buffer, util_fw_version, 634 kvp_srv_version); 635 636 } else { 637 kvp_msg = (struct hv_kvp_msg *)&recv_buffer[ 638 sizeof(struct vmbuspipe_hdr) + 639 sizeof(struct icmsg_hdr)]; 640 641 /* 642 * Stash away this global state for completing the 643 * transaction; note transactions are serialized. 644 */ 645 646 kvp_transaction.recv_len = recvlen; 647 kvp_transaction.recv_channel = channel; 648 kvp_transaction.recv_req_id = requestid; 649 kvp_transaction.kvp_msg = kvp_msg; 650 651 if (kvp_transaction.state < HVUTIL_READY) { 652 /* Userspace is not registered yet */ 653 kvp_respond_to_host(NULL, HV_E_FAIL); 654 return; 655 } 656 kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED; 657 658 /* 659 * Get the information from the 660 * user-mode component. 661 * component. This transaction will be 662 * completed when we get the value from 663 * the user-mode component. 664 * Set a timeout to deal with 665 * user-mode not responding. 666 */ 667 schedule_work(&kvp_sendkey_work); 668 schedule_delayed_work(&kvp_timeout_work, 5*HZ); 669 670 return; 671 672 } 673 674 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION 675 | ICMSGHDRFLAG_RESPONSE; 676 677 vmbus_sendpacket(channel, recv_buffer, 678 recvlen, requestid, 679 VM_PKT_DATA_INBAND, 0); 680 } 681 682 } 683 684 static void kvp_on_reset(void) 685 { 686 if (cancel_delayed_work_sync(&kvp_timeout_work)) 687 kvp_respond_to_host(NULL, HV_E_FAIL); 688 kvp_transaction.state = HVUTIL_DEVICE_INIT; 689 } 690 691 int 692 hv_kvp_init(struct hv_util_service *srv) 693 { 694 recv_buffer = srv->recv_buffer; 695 696 /* 697 * When this driver loads, the user level daemon that 698 * processes the host requests may not yet be running. 699 * Defer processing channel callbacks until the daemon 700 * has registered. 701 */ 702 kvp_transaction.state = HVUTIL_DEVICE_INIT; 703 704 hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL, 705 kvp_on_msg, kvp_on_reset); 706 if (!hvt) 707 return -EFAULT; 708 709 return 0; 710 } 711 712 void hv_kvp_deinit(void) 713 { 714 kvp_transaction.state = HVUTIL_DEVICE_DYING; 715 cancel_delayed_work_sync(&kvp_timeout_work); 716 cancel_work_sync(&kvp_sendkey_work); 717 hvutil_transport_destroy(hvt); 718 } 719