1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, see <http://www.gnu.org/licenses/>. 15 * 16 * Authors: 17 * Haiyang Zhang <haiyangz@microsoft.com> 18 * Hank Janssen <hjanssen@microsoft.com> 19 */ 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/kernel.h> 23 #include <linux/sched.h> 24 #include <linux/wait.h> 25 #include <linux/mm.h> 26 #include <linux/delay.h> 27 #include <linux/io.h> 28 #include <linux/slab.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_ether.h> 31 #include <linux/vmalloc.h> 32 #include <asm/sync_bitops.h> 33 34 #include "hyperv_net.h" 35 36 /* 37 * Switch the data path from the synthetic interface to the VF 38 * interface. 39 */ 40 void netvsc_switch_datapath(struct net_device *ndev, bool vf) 41 { 42 struct net_device_context *net_device_ctx = netdev_priv(ndev); 43 struct hv_device *dev = net_device_ctx->device_ctx; 44 struct netvsc_device *nv_dev = net_device_ctx->nvdev; 45 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; 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 56 vmbus_sendpacket(dev->channel, init_pkt, 57 sizeof(struct nvsp_message), 58 (unsigned long)init_pkt, 59 VM_PKT_DATA_INBAND, 0); 60 } 61 62 static struct netvsc_device *alloc_net_device(void) 63 { 64 struct netvsc_device *net_device; 65 66 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 67 if (!net_device) 68 return NULL; 69 70 net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL); 71 if (!net_device->cb_buffer) { 72 kfree(net_device); 73 return NULL; 74 } 75 76 net_device->mrc[0].buf = vzalloc(NETVSC_RECVSLOT_MAX * 77 sizeof(struct recv_comp_data)); 78 79 init_waitqueue_head(&net_device->wait_drain); 80 net_device->destroy = false; 81 atomic_set(&net_device->open_cnt, 0); 82 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 83 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 84 init_completion(&net_device->channel_init_wait); 85 86 return net_device; 87 } 88 89 static void free_netvsc_device(struct netvsc_device *nvdev) 90 { 91 int i; 92 93 for (i = 0; i < VRSS_CHANNEL_MAX; i++) 94 vfree(nvdev->mrc[i].buf); 95 96 kfree(nvdev->cb_buffer); 97 kfree(nvdev); 98 } 99 100 static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 101 { 102 struct netvsc_device *net_device = hv_device_to_netvsc_device(device); 103 104 if (net_device && net_device->destroy) 105 net_device = NULL; 106 107 return net_device; 108 } 109 110 static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 111 { 112 struct netvsc_device *net_device = hv_device_to_netvsc_device(device); 113 114 if (!net_device) 115 goto get_in_err; 116 117 if (net_device->destroy && 118 atomic_read(&net_device->num_outstanding_sends) == 0 && 119 atomic_read(&net_device->num_outstanding_recvs) == 0) 120 net_device = NULL; 121 122 get_in_err: 123 return net_device; 124 } 125 126 static void netvsc_destroy_buf(struct hv_device *device) 127 { 128 struct nvsp_message *revoke_packet; 129 struct net_device *ndev = hv_get_drvdata(device); 130 struct netvsc_device *net_device = net_device_to_netvsc_device(ndev); 131 int ret; 132 133 /* 134 * If we got a section count, it means we received a 135 * SendReceiveBufferComplete msg (ie sent 136 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 137 * to send a revoke msg here 138 */ 139 if (net_device->recv_section_cnt) { 140 /* Send the revoke receive buffer */ 141 revoke_packet = &net_device->revoke_packet; 142 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 143 144 revoke_packet->hdr.msg_type = 145 NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 146 revoke_packet->msg.v1_msg. 147 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 148 149 ret = vmbus_sendpacket(device->channel, 150 revoke_packet, 151 sizeof(struct nvsp_message), 152 (unsigned long)revoke_packet, 153 VM_PKT_DATA_INBAND, 0); 154 /* 155 * If we failed here, we might as well return and 156 * have a leak rather than continue and a bugchk 157 */ 158 if (ret != 0) { 159 netdev_err(ndev, "unable to send " 160 "revoke receive buffer to netvsp\n"); 161 return; 162 } 163 } 164 165 /* Teardown the gpadl on the vsp end */ 166 if (net_device->recv_buf_gpadl_handle) { 167 ret = vmbus_teardown_gpadl(device->channel, 168 net_device->recv_buf_gpadl_handle); 169 170 /* If we failed here, we might as well return and have a leak 171 * rather than continue and a bugchk 172 */ 173 if (ret != 0) { 174 netdev_err(ndev, 175 "unable to teardown receive buffer's gpadl\n"); 176 return; 177 } 178 net_device->recv_buf_gpadl_handle = 0; 179 } 180 181 if (net_device->recv_buf) { 182 /* Free up the receive buffer */ 183 vfree(net_device->recv_buf); 184 net_device->recv_buf = NULL; 185 } 186 187 if (net_device->recv_section) { 188 net_device->recv_section_cnt = 0; 189 kfree(net_device->recv_section); 190 net_device->recv_section = NULL; 191 } 192 193 /* Deal with the send buffer we may have setup. 194 * If we got a send section size, it means we received a 195 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 196 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 197 * to send a revoke msg here 198 */ 199 if (net_device->send_section_size) { 200 /* Send the revoke receive buffer */ 201 revoke_packet = &net_device->revoke_packet; 202 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 203 204 revoke_packet->hdr.msg_type = 205 NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 206 revoke_packet->msg.v1_msg.revoke_send_buf.id = 207 NETVSC_SEND_BUFFER_ID; 208 209 ret = vmbus_sendpacket(device->channel, 210 revoke_packet, 211 sizeof(struct nvsp_message), 212 (unsigned long)revoke_packet, 213 VM_PKT_DATA_INBAND, 0); 214 /* If we failed here, we might as well return and 215 * have a leak rather than continue and a bugchk 216 */ 217 if (ret != 0) { 218 netdev_err(ndev, "unable to send " 219 "revoke send buffer to netvsp\n"); 220 return; 221 } 222 } 223 /* Teardown the gpadl on the vsp end */ 224 if (net_device->send_buf_gpadl_handle) { 225 ret = vmbus_teardown_gpadl(device->channel, 226 net_device->send_buf_gpadl_handle); 227 228 /* If we failed here, we might as well return and have a leak 229 * rather than continue and a bugchk 230 */ 231 if (ret != 0) { 232 netdev_err(ndev, 233 "unable to teardown send buffer's gpadl\n"); 234 return; 235 } 236 net_device->send_buf_gpadl_handle = 0; 237 } 238 if (net_device->send_buf) { 239 /* Free up the send buffer */ 240 vfree(net_device->send_buf); 241 net_device->send_buf = NULL; 242 } 243 kfree(net_device->send_section_map); 244 } 245 246 static int netvsc_init_buf(struct hv_device *device) 247 { 248 int ret = 0; 249 struct netvsc_device *net_device; 250 struct nvsp_message *init_packet; 251 struct net_device *ndev; 252 int node; 253 254 net_device = get_outbound_net_device(device); 255 if (!net_device) 256 return -ENODEV; 257 ndev = hv_get_drvdata(device); 258 259 node = cpu_to_node(device->channel->target_cpu); 260 net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node); 261 if (!net_device->recv_buf) 262 net_device->recv_buf = vzalloc(net_device->recv_buf_size); 263 264 if (!net_device->recv_buf) { 265 netdev_err(ndev, "unable to allocate receive " 266 "buffer of size %d\n", net_device->recv_buf_size); 267 ret = -ENOMEM; 268 goto cleanup; 269 } 270 271 /* 272 * Establish the gpadl handle for this buffer on this 273 * channel. Note: This call uses the vmbus connection rather 274 * than the channel to establish the gpadl handle. 275 */ 276 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 277 net_device->recv_buf_size, 278 &net_device->recv_buf_gpadl_handle); 279 if (ret != 0) { 280 netdev_err(ndev, 281 "unable to establish receive buffer's gpadl\n"); 282 goto cleanup; 283 } 284 285 /* Notify the NetVsp of the gpadl handle */ 286 init_packet = &net_device->channel_init_pkt; 287 288 memset(init_packet, 0, sizeof(struct nvsp_message)); 289 290 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 291 init_packet->msg.v1_msg.send_recv_buf. 292 gpadl_handle = net_device->recv_buf_gpadl_handle; 293 init_packet->msg.v1_msg. 294 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 295 296 /* Send the gpadl notification request */ 297 ret = vmbus_sendpacket(device->channel, init_packet, 298 sizeof(struct nvsp_message), 299 (unsigned long)init_packet, 300 VM_PKT_DATA_INBAND, 301 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 302 if (ret != 0) { 303 netdev_err(ndev, 304 "unable to send receive buffer's gpadl to netvsp\n"); 305 goto cleanup; 306 } 307 308 wait_for_completion(&net_device->channel_init_wait); 309 310 /* Check the response */ 311 if (init_packet->msg.v1_msg. 312 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 313 netdev_err(ndev, "Unable to complete receive buffer " 314 "initialization with NetVsp - status %d\n", 315 init_packet->msg.v1_msg. 316 send_recv_buf_complete.status); 317 ret = -EINVAL; 318 goto cleanup; 319 } 320 321 /* Parse the response */ 322 323 net_device->recv_section_cnt = init_packet->msg. 324 v1_msg.send_recv_buf_complete.num_sections; 325 326 net_device->recv_section = kmemdup( 327 init_packet->msg.v1_msg.send_recv_buf_complete.sections, 328 net_device->recv_section_cnt * 329 sizeof(struct nvsp_1_receive_buffer_section), 330 GFP_KERNEL); 331 if (net_device->recv_section == NULL) { 332 ret = -EINVAL; 333 goto cleanup; 334 } 335 336 /* 337 * For 1st release, there should only be 1 section that represents the 338 * entire receive buffer 339 */ 340 if (net_device->recv_section_cnt != 1 || 341 net_device->recv_section->offset != 0) { 342 ret = -EINVAL; 343 goto cleanup; 344 } 345 346 /* Now setup the send buffer. 347 */ 348 net_device->send_buf = vzalloc_node(net_device->send_buf_size, node); 349 if (!net_device->send_buf) 350 net_device->send_buf = vzalloc(net_device->send_buf_size); 351 if (!net_device->send_buf) { 352 netdev_err(ndev, "unable to allocate send " 353 "buffer of size %d\n", net_device->send_buf_size); 354 ret = -ENOMEM; 355 goto cleanup; 356 } 357 358 /* Establish the gpadl handle for this buffer on this 359 * channel. Note: This call uses the vmbus connection rather 360 * than the channel to establish the gpadl handle. 361 */ 362 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 363 net_device->send_buf_size, 364 &net_device->send_buf_gpadl_handle); 365 if (ret != 0) { 366 netdev_err(ndev, 367 "unable to establish send buffer's gpadl\n"); 368 goto cleanup; 369 } 370 371 /* Notify the NetVsp of the gpadl handle */ 372 init_packet = &net_device->channel_init_pkt; 373 memset(init_packet, 0, sizeof(struct nvsp_message)); 374 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 375 init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 376 net_device->send_buf_gpadl_handle; 377 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 378 379 /* Send the gpadl notification request */ 380 ret = vmbus_sendpacket(device->channel, init_packet, 381 sizeof(struct nvsp_message), 382 (unsigned long)init_packet, 383 VM_PKT_DATA_INBAND, 384 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 385 if (ret != 0) { 386 netdev_err(ndev, 387 "unable to send send buffer's gpadl to netvsp\n"); 388 goto cleanup; 389 } 390 391 wait_for_completion(&net_device->channel_init_wait); 392 393 /* Check the response */ 394 if (init_packet->msg.v1_msg. 395 send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 396 netdev_err(ndev, "Unable to complete send buffer " 397 "initialization with NetVsp - status %d\n", 398 init_packet->msg.v1_msg. 399 send_send_buf_complete.status); 400 ret = -EINVAL; 401 goto cleanup; 402 } 403 404 /* Parse the response */ 405 net_device->send_section_size = init_packet->msg. 406 v1_msg.send_send_buf_complete.section_size; 407 408 /* Section count is simply the size divided by the section size. 409 */ 410 net_device->send_section_cnt = 411 net_device->send_buf_size / net_device->send_section_size; 412 413 dev_info(&device->device, "Send section size: %d, Section count:%d\n", 414 net_device->send_section_size, net_device->send_section_cnt); 415 416 /* Setup state for managing the send buffer. */ 417 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt, 418 BITS_PER_LONG); 419 420 net_device->send_section_map = kcalloc(net_device->map_words, 421 sizeof(ulong), GFP_KERNEL); 422 if (net_device->send_section_map == NULL) { 423 ret = -ENOMEM; 424 goto cleanup; 425 } 426 427 goto exit; 428 429 cleanup: 430 netvsc_destroy_buf(device); 431 432 exit: 433 return ret; 434 } 435 436 /* Negotiate NVSP protocol version */ 437 static int negotiate_nvsp_ver(struct hv_device *device, 438 struct netvsc_device *net_device, 439 struct nvsp_message *init_packet, 440 u32 nvsp_ver) 441 { 442 struct net_device *ndev = hv_get_drvdata(device); 443 int ret; 444 445 memset(init_packet, 0, sizeof(struct nvsp_message)); 446 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 447 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 448 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 449 450 /* Send the init request */ 451 ret = vmbus_sendpacket(device->channel, init_packet, 452 sizeof(struct nvsp_message), 453 (unsigned long)init_packet, 454 VM_PKT_DATA_INBAND, 455 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 456 457 if (ret != 0) 458 return ret; 459 460 wait_for_completion(&net_device->channel_init_wait); 461 462 if (init_packet->msg.init_msg.init_complete.status != 463 NVSP_STAT_SUCCESS) 464 return -EINVAL; 465 466 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 467 return 0; 468 469 /* NVSPv2 or later: Send NDIS config */ 470 memset(init_packet, 0, sizeof(struct nvsp_message)); 471 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 472 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; 473 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 474 475 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { 476 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; 477 478 /* Teaming bit is needed to receive link speed updates */ 479 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; 480 } 481 482 ret = vmbus_sendpacket(device->channel, init_packet, 483 sizeof(struct nvsp_message), 484 (unsigned long)init_packet, 485 VM_PKT_DATA_INBAND, 0); 486 487 return ret; 488 } 489 490 static int netvsc_connect_vsp(struct hv_device *device) 491 { 492 int ret; 493 struct netvsc_device *net_device; 494 struct nvsp_message *init_packet; 495 int ndis_version; 496 const u32 ver_list[] = { 497 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 498 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; 499 int i; 500 501 net_device = get_outbound_net_device(device); 502 if (!net_device) 503 return -ENODEV; 504 505 init_packet = &net_device->channel_init_pkt; 506 507 /* Negotiate the latest NVSP protocol supported */ 508 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) 509 if (negotiate_nvsp_ver(device, net_device, init_packet, 510 ver_list[i]) == 0) { 511 net_device->nvsp_version = ver_list[i]; 512 break; 513 } 514 515 if (i < 0) { 516 ret = -EPROTO; 517 goto cleanup; 518 } 519 520 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 521 522 /* Send the ndis version */ 523 memset(init_packet, 0, sizeof(struct nvsp_message)); 524 525 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 526 ndis_version = 0x00060001; 527 else 528 ndis_version = 0x0006001e; 529 530 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 531 init_packet->msg.v1_msg. 532 send_ndis_ver.ndis_major_ver = 533 (ndis_version & 0xFFFF0000) >> 16; 534 init_packet->msg.v1_msg. 535 send_ndis_ver.ndis_minor_ver = 536 ndis_version & 0xFFFF; 537 538 /* Send the init request */ 539 ret = vmbus_sendpacket(device->channel, init_packet, 540 sizeof(struct nvsp_message), 541 (unsigned long)init_packet, 542 VM_PKT_DATA_INBAND, 0); 543 if (ret != 0) 544 goto cleanup; 545 546 /* Post the big receive buffer to NetVSP */ 547 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 548 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; 549 else 550 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 551 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; 552 553 ret = netvsc_init_buf(device); 554 555 cleanup: 556 return ret; 557 } 558 559 static void netvsc_disconnect_vsp(struct hv_device *device) 560 { 561 netvsc_destroy_buf(device); 562 } 563 564 /* 565 * netvsc_device_remove - Callback when the root bus device is removed 566 */ 567 void netvsc_device_remove(struct hv_device *device) 568 { 569 struct net_device *ndev = hv_get_drvdata(device); 570 struct net_device_context *net_device_ctx = netdev_priv(ndev); 571 struct netvsc_device *net_device = net_device_ctx->nvdev; 572 573 netvsc_disconnect_vsp(device); 574 575 net_device_ctx->nvdev = NULL; 576 577 /* 578 * At this point, no one should be accessing net_device 579 * except in here 580 */ 581 dev_notice(&device->device, "net device safe to remove\n"); 582 583 /* Now, we can close the channel safely */ 584 vmbus_close(device->channel); 585 586 /* Release all resources */ 587 vfree(net_device->sub_cb_buf); 588 free_netvsc_device(net_device); 589 } 590 591 #define RING_AVAIL_PERCENT_HIWATER 20 592 #define RING_AVAIL_PERCENT_LOWATER 10 593 594 /* 595 * Get the percentage of available bytes to write in the ring. 596 * The return value is in range from 0 to 100. 597 */ 598 static inline u32 hv_ringbuf_avail_percent( 599 struct hv_ring_buffer_info *ring_info) 600 { 601 u32 avail_read, avail_write; 602 603 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 604 605 return avail_write * 100 / ring_info->ring_datasize; 606 } 607 608 static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 609 u32 index) 610 { 611 sync_change_bit(index, net_device->send_section_map); 612 } 613 614 static void netvsc_send_tx_complete(struct netvsc_device *net_device, 615 struct vmbus_channel *incoming_channel, 616 struct hv_device *device, 617 struct vmpacket_descriptor *packet) 618 { 619 struct sk_buff *skb = (struct sk_buff *)(unsigned long)packet->trans_id; 620 struct net_device *ndev = hv_get_drvdata(device); 621 struct net_device_context *net_device_ctx = netdev_priv(ndev); 622 struct vmbus_channel *channel = device->channel; 623 int num_outstanding_sends; 624 u16 q_idx = 0; 625 int queue_sends; 626 627 /* Notify the layer above us */ 628 if (likely(skb)) { 629 struct hv_netvsc_packet *nvsc_packet 630 = (struct hv_netvsc_packet *)skb->cb; 631 u32 send_index = nvsc_packet->send_buf_index; 632 633 if (send_index != NETVSC_INVALID_INDEX) 634 netvsc_free_send_slot(net_device, send_index); 635 q_idx = nvsc_packet->q_idx; 636 channel = incoming_channel; 637 638 dev_consume_skb_any(skb); 639 } 640 641 num_outstanding_sends = 642 atomic_dec_return(&net_device->num_outstanding_sends); 643 queue_sends = atomic_dec_return(&net_device->queue_sends[q_idx]); 644 645 if (net_device->destroy && num_outstanding_sends == 0) 646 wake_up(&net_device->wait_drain); 647 648 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && 649 !net_device_ctx->start_remove && 650 (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER || 651 queue_sends < 1)) 652 netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx)); 653 } 654 655 static void netvsc_send_completion(struct netvsc_device *net_device, 656 struct vmbus_channel *incoming_channel, 657 struct hv_device *device, 658 struct vmpacket_descriptor *packet) 659 { 660 struct nvsp_message *nvsp_packet; 661 struct net_device *ndev = hv_get_drvdata(device); 662 663 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 664 (packet->offset8 << 3)); 665 666 switch (nvsp_packet->hdr.msg_type) { 667 case NVSP_MSG_TYPE_INIT_COMPLETE: 668 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: 669 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: 670 case NVSP_MSG5_TYPE_SUBCHANNEL: 671 /* Copy the response back */ 672 memcpy(&net_device->channel_init_pkt, nvsp_packet, 673 sizeof(struct nvsp_message)); 674 complete(&net_device->channel_init_wait); 675 break; 676 677 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: 678 netvsc_send_tx_complete(net_device, incoming_channel, 679 device, packet); 680 break; 681 682 default: 683 netdev_err(ndev, 684 "Unknown send completion type %d received!!\n", 685 nvsp_packet->hdr.msg_type); 686 } 687 } 688 689 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 690 { 691 unsigned long index; 692 u32 max_words = net_device->map_words; 693 unsigned long *map_addr = (unsigned long *)net_device->send_section_map; 694 u32 section_cnt = net_device->send_section_cnt; 695 int ret_val = NETVSC_INVALID_INDEX; 696 int i; 697 int prev_val; 698 699 for (i = 0; i < max_words; i++) { 700 if (!~(map_addr[i])) 701 continue; 702 index = ffz(map_addr[i]); 703 prev_val = sync_test_and_set_bit(index, &map_addr[i]); 704 if (prev_val) 705 continue; 706 if ((index + (i * BITS_PER_LONG)) >= section_cnt) 707 break; 708 ret_val = (index + (i * BITS_PER_LONG)); 709 break; 710 } 711 return ret_val; 712 } 713 714 static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, 715 unsigned int section_index, 716 u32 pend_size, 717 struct hv_netvsc_packet *packet, 718 struct rndis_message *rndis_msg, 719 struct hv_page_buffer **pb, 720 struct sk_buff *skb) 721 { 722 char *start = net_device->send_buf; 723 char *dest = start + (section_index * net_device->send_section_size) 724 + pend_size; 725 int i; 726 bool is_data_pkt = (skb != NULL) ? true : false; 727 bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 728 u32 msg_size = 0; 729 u32 padding = 0; 730 u32 remain = packet->total_data_buflen % net_device->pkt_align; 731 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 732 packet->page_buf_cnt; 733 734 /* Add padding */ 735 if (is_data_pkt && xmit_more && remain && 736 !packet->cp_partial) { 737 padding = net_device->pkt_align - remain; 738 rndis_msg->msg_len += padding; 739 packet->total_data_buflen += padding; 740 } 741 742 for (i = 0; i < page_count; i++) { 743 char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT); 744 u32 offset = (*pb)[i].offset; 745 u32 len = (*pb)[i].len; 746 747 memcpy(dest, (src + offset), len); 748 msg_size += len; 749 dest += len; 750 } 751 752 if (padding) { 753 memset(dest, 0, padding); 754 msg_size += padding; 755 } 756 757 return msg_size; 758 } 759 760 static inline int netvsc_send_pkt( 761 struct hv_device *device, 762 struct hv_netvsc_packet *packet, 763 struct netvsc_device *net_device, 764 struct hv_page_buffer **pb, 765 struct sk_buff *skb) 766 { 767 struct nvsp_message nvmsg; 768 u16 q_idx = packet->q_idx; 769 struct vmbus_channel *out_channel = net_device->chn_table[q_idx]; 770 struct net_device *ndev = hv_get_drvdata(device); 771 u64 req_id; 772 int ret; 773 struct hv_page_buffer *pgbuf; 774 u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); 775 bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 776 777 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 778 if (skb != NULL) { 779 /* 0 is RMC_DATA; */ 780 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; 781 } else { 782 /* 1 is RMC_CONTROL; */ 783 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; 784 } 785 786 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 787 packet->send_buf_index; 788 if (packet->send_buf_index == NETVSC_INVALID_INDEX) 789 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 790 else 791 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 792 packet->total_data_buflen; 793 794 req_id = (ulong)skb; 795 796 if (out_channel->rescind) 797 return -ENODEV; 798 799 /* 800 * It is possible that once we successfully place this packet 801 * on the ringbuffer, we may stop the queue. In that case, we want 802 * to notify the host independent of the xmit_more flag. We don't 803 * need to be precise here; in the worst case we may signal the host 804 * unnecessarily. 805 */ 806 if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1)) 807 xmit_more = false; 808 809 if (packet->page_buf_cnt) { 810 pgbuf = packet->cp_partial ? (*pb) + 811 packet->rmsg_pgcnt : (*pb); 812 ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, 813 pgbuf, 814 packet->page_buf_cnt, 815 &nvmsg, 816 sizeof(struct nvsp_message), 817 req_id, 818 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 819 !xmit_more); 820 } else { 821 ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, 822 sizeof(struct nvsp_message), 823 req_id, 824 VM_PKT_DATA_INBAND, 825 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 826 !xmit_more); 827 } 828 829 if (ret == 0) { 830 atomic_inc(&net_device->num_outstanding_sends); 831 atomic_inc(&net_device->queue_sends[q_idx]); 832 833 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { 834 netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx)); 835 836 if (atomic_read(&net_device-> 837 queue_sends[q_idx]) < 1) 838 netif_tx_wake_queue(netdev_get_tx_queue( 839 ndev, q_idx)); 840 } 841 } else if (ret == -EAGAIN) { 842 netif_tx_stop_queue(netdev_get_tx_queue( 843 ndev, q_idx)); 844 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) { 845 netif_tx_wake_queue(netdev_get_tx_queue( 846 ndev, q_idx)); 847 ret = -ENOSPC; 848 } 849 } else { 850 netdev_err(ndev, "Unable to send packet %p ret %d\n", 851 packet, ret); 852 } 853 854 return ret; 855 } 856 857 /* Move packet out of multi send data (msd), and clear msd */ 858 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, 859 struct sk_buff **msd_skb, 860 struct multi_send_data *msdp) 861 { 862 *msd_skb = msdp->skb; 863 *msd_send = msdp->pkt; 864 msdp->skb = NULL; 865 msdp->pkt = NULL; 866 msdp->count = 0; 867 } 868 869 int netvsc_send(struct hv_device *device, 870 struct hv_netvsc_packet *packet, 871 struct rndis_message *rndis_msg, 872 struct hv_page_buffer **pb, 873 struct sk_buff *skb) 874 { 875 struct netvsc_device *net_device; 876 int ret = 0; 877 struct vmbus_channel *out_channel; 878 u16 q_idx = packet->q_idx; 879 u32 pktlen = packet->total_data_buflen, msd_len = 0; 880 unsigned int section_index = NETVSC_INVALID_INDEX; 881 struct multi_send_data *msdp; 882 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 883 struct sk_buff *msd_skb = NULL; 884 bool try_batch; 885 bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 886 887 net_device = get_outbound_net_device(device); 888 if (!net_device) 889 return -ENODEV; 890 891 out_channel = net_device->chn_table[q_idx]; 892 893 packet->send_buf_index = NETVSC_INVALID_INDEX; 894 packet->cp_partial = false; 895 896 /* Send control message directly without accessing msd (Multi-Send 897 * Data) field which may be changed during data packet processing. 898 */ 899 if (!skb) { 900 cur_send = packet; 901 goto send_now; 902 } 903 904 msdp = &net_device->msd[q_idx]; 905 906 /* batch packets in send buffer if possible */ 907 if (msdp->pkt) 908 msd_len = msdp->pkt->total_data_buflen; 909 910 try_batch = (skb != NULL) && msd_len > 0 && msdp->count < 911 net_device->max_pkt; 912 913 if (try_batch && msd_len + pktlen + net_device->pkt_align < 914 net_device->send_section_size) { 915 section_index = msdp->pkt->send_buf_index; 916 917 } else if (try_batch && msd_len + packet->rmsg_size < 918 net_device->send_section_size) { 919 section_index = msdp->pkt->send_buf_index; 920 packet->cp_partial = true; 921 922 } else if ((skb != NULL) && pktlen + net_device->pkt_align < 923 net_device->send_section_size) { 924 section_index = netvsc_get_next_send_section(net_device); 925 if (section_index != NETVSC_INVALID_INDEX) { 926 move_pkt_msd(&msd_send, &msd_skb, msdp); 927 msd_len = 0; 928 } 929 } 930 931 if (section_index != NETVSC_INVALID_INDEX) { 932 netvsc_copy_to_send_buf(net_device, 933 section_index, msd_len, 934 packet, rndis_msg, pb, skb); 935 936 packet->send_buf_index = section_index; 937 938 if (packet->cp_partial) { 939 packet->page_buf_cnt -= packet->rmsg_pgcnt; 940 packet->total_data_buflen = msd_len + packet->rmsg_size; 941 } else { 942 packet->page_buf_cnt = 0; 943 packet->total_data_buflen += msd_len; 944 } 945 946 if (msdp->skb) 947 dev_consume_skb_any(msdp->skb); 948 949 if (xmit_more && !packet->cp_partial) { 950 msdp->skb = skb; 951 msdp->pkt = packet; 952 msdp->count++; 953 } else { 954 cur_send = packet; 955 msdp->skb = NULL; 956 msdp->pkt = NULL; 957 msdp->count = 0; 958 } 959 } else { 960 move_pkt_msd(&msd_send, &msd_skb, msdp); 961 cur_send = packet; 962 } 963 964 if (msd_send) { 965 int m_ret = netvsc_send_pkt(device, msd_send, net_device, 966 NULL, msd_skb); 967 968 if (m_ret != 0) { 969 netvsc_free_send_slot(net_device, 970 msd_send->send_buf_index); 971 dev_kfree_skb_any(msd_skb); 972 } 973 } 974 975 send_now: 976 if (cur_send) 977 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); 978 979 if (ret != 0 && section_index != NETVSC_INVALID_INDEX) 980 netvsc_free_send_slot(net_device, section_index); 981 982 return ret; 983 } 984 985 static int netvsc_send_recv_completion(struct vmbus_channel *channel, 986 u64 transaction_id, u32 status) 987 { 988 struct nvsp_message recvcompMessage; 989 int ret; 990 991 recvcompMessage.hdr.msg_type = 992 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 993 994 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 995 996 /* Send the completion */ 997 ret = vmbus_sendpacket(channel, &recvcompMessage, 998 sizeof(struct nvsp_message_header) + sizeof(u32), 999 transaction_id, VM_PKT_COMP, 0); 1000 1001 return ret; 1002 } 1003 1004 static inline void count_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx, 1005 u32 *filled, u32 *avail) 1006 { 1007 u32 first = nvdev->mrc[q_idx].first; 1008 u32 next = nvdev->mrc[q_idx].next; 1009 1010 *filled = (first > next) ? NETVSC_RECVSLOT_MAX - first + next : 1011 next - first; 1012 1013 *avail = NETVSC_RECVSLOT_MAX - *filled - 1; 1014 } 1015 1016 /* Read the first filled slot, no change to index */ 1017 static inline struct recv_comp_data *read_recv_comp_slot(struct netvsc_device 1018 *nvdev, u16 q_idx) 1019 { 1020 u32 filled, avail; 1021 1022 if (!nvdev->mrc[q_idx].buf) 1023 return NULL; 1024 1025 count_recv_comp_slot(nvdev, q_idx, &filled, &avail); 1026 if (!filled) 1027 return NULL; 1028 1029 return nvdev->mrc[q_idx].buf + nvdev->mrc[q_idx].first * 1030 sizeof(struct recv_comp_data); 1031 } 1032 1033 /* Put the first filled slot back to available pool */ 1034 static inline void put_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx) 1035 { 1036 int num_recv; 1037 1038 nvdev->mrc[q_idx].first = (nvdev->mrc[q_idx].first + 1) % 1039 NETVSC_RECVSLOT_MAX; 1040 1041 num_recv = atomic_dec_return(&nvdev->num_outstanding_recvs); 1042 1043 if (nvdev->destroy && num_recv == 0) 1044 wake_up(&nvdev->wait_drain); 1045 } 1046 1047 /* Check and send pending recv completions */ 1048 static void netvsc_chk_recv_comp(struct netvsc_device *nvdev, 1049 struct vmbus_channel *channel, u16 q_idx) 1050 { 1051 struct recv_comp_data *rcd; 1052 int ret; 1053 1054 while (true) { 1055 rcd = read_recv_comp_slot(nvdev, q_idx); 1056 if (!rcd) 1057 break; 1058 1059 ret = netvsc_send_recv_completion(channel, rcd->tid, 1060 rcd->status); 1061 if (ret) 1062 break; 1063 1064 put_recv_comp_slot(nvdev, q_idx); 1065 } 1066 } 1067 1068 #define NETVSC_RCD_WATERMARK 80 1069 1070 /* Get next available slot */ 1071 static inline struct recv_comp_data *get_recv_comp_slot( 1072 struct netvsc_device *nvdev, struct vmbus_channel *channel, u16 q_idx) 1073 { 1074 u32 filled, avail, next; 1075 struct recv_comp_data *rcd; 1076 1077 if (!nvdev->recv_section) 1078 return NULL; 1079 1080 if (!nvdev->mrc[q_idx].buf) 1081 return NULL; 1082 1083 if (atomic_read(&nvdev->num_outstanding_recvs) > 1084 nvdev->recv_section->num_sub_allocs * NETVSC_RCD_WATERMARK / 100) 1085 netvsc_chk_recv_comp(nvdev, channel, q_idx); 1086 1087 count_recv_comp_slot(nvdev, q_idx, &filled, &avail); 1088 if (!avail) 1089 return NULL; 1090 1091 next = nvdev->mrc[q_idx].next; 1092 rcd = nvdev->mrc[q_idx].buf + next * sizeof(struct recv_comp_data); 1093 nvdev->mrc[q_idx].next = (next + 1) % NETVSC_RECVSLOT_MAX; 1094 1095 atomic_inc(&nvdev->num_outstanding_recvs); 1096 1097 return rcd; 1098 } 1099 1100 static void netvsc_receive(struct netvsc_device *net_device, 1101 struct vmbus_channel *channel, 1102 struct hv_device *device, 1103 struct vmpacket_descriptor *packet) 1104 { 1105 struct vmtransfer_page_packet_header *vmxferpage_packet; 1106 struct nvsp_message *nvsp_packet; 1107 struct hv_netvsc_packet nv_pkt; 1108 struct hv_netvsc_packet *netvsc_packet = &nv_pkt; 1109 u32 status = NVSP_STAT_SUCCESS; 1110 int i; 1111 int count = 0; 1112 struct net_device *ndev = hv_get_drvdata(device); 1113 void *data; 1114 int ret; 1115 struct recv_comp_data *rcd; 1116 u16 q_idx = channel->offermsg.offer.sub_channel_index; 1117 1118 /* 1119 * All inbound packets other than send completion should be xfer page 1120 * packet 1121 */ 1122 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 1123 netdev_err(ndev, "Unknown packet type received - %d\n", 1124 packet->type); 1125 return; 1126 } 1127 1128 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 1129 (packet->offset8 << 3)); 1130 1131 /* Make sure this is a valid nvsp packet */ 1132 if (nvsp_packet->hdr.msg_type != 1133 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 1134 netdev_err(ndev, "Unknown nvsp packet type received-" 1135 " %d\n", nvsp_packet->hdr.msg_type); 1136 return; 1137 } 1138 1139 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 1140 1141 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 1142 netdev_err(ndev, "Invalid xfer page set id - " 1143 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 1144 vmxferpage_packet->xfer_pageset_id); 1145 return; 1146 } 1147 1148 count = vmxferpage_packet->range_cnt; 1149 1150 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 1151 for (i = 0; i < count; i++) { 1152 /* Initialize the netvsc packet */ 1153 data = (void *)((unsigned long)net_device-> 1154 recv_buf + vmxferpage_packet->ranges[i].byte_offset); 1155 netvsc_packet->total_data_buflen = 1156 vmxferpage_packet->ranges[i].byte_count; 1157 1158 /* Pass it to the upper layer */ 1159 status = rndis_filter_receive(device, netvsc_packet, &data, 1160 channel); 1161 } 1162 1163 if (!net_device->mrc[q_idx].buf) { 1164 ret = netvsc_send_recv_completion(channel, 1165 vmxferpage_packet->d.trans_id, 1166 status); 1167 if (ret) 1168 netdev_err(ndev, "Recv_comp q:%hd, tid:%llx, err:%d\n", 1169 q_idx, vmxferpage_packet->d.trans_id, ret); 1170 return; 1171 } 1172 1173 rcd = get_recv_comp_slot(net_device, channel, q_idx); 1174 1175 if (!rcd) { 1176 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", 1177 q_idx, vmxferpage_packet->d.trans_id); 1178 return; 1179 } 1180 1181 rcd->tid = vmxferpage_packet->d.trans_id; 1182 rcd->status = status; 1183 } 1184 1185 static void netvsc_send_table(struct hv_device *hdev, 1186 struct nvsp_message *nvmsg) 1187 { 1188 struct netvsc_device *nvscdev; 1189 struct net_device *ndev = hv_get_drvdata(hdev); 1190 int i; 1191 u32 count, *tab; 1192 1193 nvscdev = get_outbound_net_device(hdev); 1194 if (!nvscdev) 1195 return; 1196 1197 count = nvmsg->msg.v5_msg.send_table.count; 1198 if (count != VRSS_SEND_TAB_SIZE) { 1199 netdev_err(ndev, "Received wrong send-table size:%u\n", count); 1200 return; 1201 } 1202 1203 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + 1204 nvmsg->msg.v5_msg.send_table.offset); 1205 1206 for (i = 0; i < count; i++) 1207 nvscdev->send_table[i] = tab[i]; 1208 } 1209 1210 static void netvsc_send_vf(struct net_device_context *net_device_ctx, 1211 struct nvsp_message *nvmsg) 1212 { 1213 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; 1214 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; 1215 } 1216 1217 static inline void netvsc_receive_inband(struct hv_device *hdev, 1218 struct net_device_context *net_device_ctx, 1219 struct nvsp_message *nvmsg) 1220 { 1221 switch (nvmsg->hdr.msg_type) { 1222 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: 1223 netvsc_send_table(hdev, nvmsg); 1224 break; 1225 1226 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: 1227 netvsc_send_vf(net_device_ctx, nvmsg); 1228 break; 1229 } 1230 } 1231 1232 static void netvsc_process_raw_pkt(struct hv_device *device, 1233 struct vmbus_channel *channel, 1234 struct netvsc_device *net_device, 1235 struct net_device *ndev, 1236 u64 request_id, 1237 struct vmpacket_descriptor *desc) 1238 { 1239 struct nvsp_message *nvmsg; 1240 struct net_device_context *net_device_ctx = netdev_priv(ndev); 1241 1242 nvmsg = (struct nvsp_message *)((unsigned long) 1243 desc + (desc->offset8 << 3)); 1244 1245 switch (desc->type) { 1246 case VM_PKT_COMP: 1247 netvsc_send_completion(net_device, channel, device, desc); 1248 break; 1249 1250 case VM_PKT_DATA_USING_XFER_PAGES: 1251 netvsc_receive(net_device, channel, device, desc); 1252 break; 1253 1254 case VM_PKT_DATA_INBAND: 1255 netvsc_receive_inband(device, net_device_ctx, nvmsg); 1256 break; 1257 1258 default: 1259 netdev_err(ndev, "unhandled packet type %d, tid %llx\n", 1260 desc->type, request_id); 1261 break; 1262 } 1263 } 1264 1265 void netvsc_channel_cb(void *context) 1266 { 1267 int ret; 1268 struct vmbus_channel *channel = (struct vmbus_channel *)context; 1269 u16 q_idx = channel->offermsg.offer.sub_channel_index; 1270 struct hv_device *device; 1271 struct netvsc_device *net_device; 1272 u32 bytes_recvd; 1273 u64 request_id; 1274 struct vmpacket_descriptor *desc; 1275 unsigned char *buffer; 1276 int bufferlen = NETVSC_PACKET_SIZE; 1277 struct net_device *ndev; 1278 bool need_to_commit = false; 1279 1280 if (channel->primary_channel != NULL) 1281 device = channel->primary_channel->device_obj; 1282 else 1283 device = channel->device_obj; 1284 1285 net_device = get_inbound_net_device(device); 1286 if (!net_device) 1287 return; 1288 ndev = hv_get_drvdata(device); 1289 buffer = get_per_channel_state(channel); 1290 1291 do { 1292 desc = get_next_pkt_raw(channel); 1293 if (desc != NULL) { 1294 netvsc_process_raw_pkt(device, 1295 channel, 1296 net_device, 1297 ndev, 1298 desc->trans_id, 1299 desc); 1300 1301 put_pkt_raw(channel, desc); 1302 need_to_commit = true; 1303 continue; 1304 } 1305 if (need_to_commit) { 1306 need_to_commit = false; 1307 commit_rd_index(channel); 1308 } 1309 1310 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen, 1311 &bytes_recvd, &request_id); 1312 if (ret == 0) { 1313 if (bytes_recvd > 0) { 1314 desc = (struct vmpacket_descriptor *)buffer; 1315 netvsc_process_raw_pkt(device, 1316 channel, 1317 net_device, 1318 ndev, 1319 request_id, 1320 desc); 1321 } else { 1322 /* 1323 * We are done for this pass. 1324 */ 1325 break; 1326 } 1327 1328 } else if (ret == -ENOBUFS) { 1329 if (bufferlen > NETVSC_PACKET_SIZE) 1330 kfree(buffer); 1331 /* Handle large packet */ 1332 buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 1333 if (buffer == NULL) { 1334 /* Try again next time around */ 1335 netdev_err(ndev, 1336 "unable to allocate buffer of size " 1337 "(%d)!!\n", bytes_recvd); 1338 break; 1339 } 1340 1341 bufferlen = bytes_recvd; 1342 } 1343 } while (1); 1344 1345 if (bufferlen > NETVSC_PACKET_SIZE) 1346 kfree(buffer); 1347 1348 netvsc_chk_recv_comp(net_device, channel, q_idx); 1349 } 1350 1351 /* 1352 * netvsc_device_add - Callback when the device belonging to this 1353 * driver is added 1354 */ 1355 int netvsc_device_add(struct hv_device *device, void *additional_info) 1356 { 1357 int i, ret = 0; 1358 int ring_size = 1359 ((struct netvsc_device_info *)additional_info)->ring_size; 1360 struct netvsc_device *net_device; 1361 struct net_device *ndev = hv_get_drvdata(device); 1362 struct net_device_context *net_device_ctx = netdev_priv(ndev); 1363 1364 net_device = alloc_net_device(); 1365 if (!net_device) 1366 return -ENOMEM; 1367 1368 net_device->ring_size = ring_size; 1369 1370 set_per_channel_state(device->channel, net_device->cb_buffer); 1371 1372 /* Open the channel */ 1373 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 1374 ring_size * PAGE_SIZE, NULL, 0, 1375 netvsc_channel_cb, device->channel); 1376 1377 if (ret != 0) { 1378 netdev_err(ndev, "unable to open channel: %d\n", ret); 1379 goto cleanup; 1380 } 1381 1382 /* Channel is opened */ 1383 pr_info("hv_netvsc channel opened successfully\n"); 1384 1385 /* If we're reopening the device we may have multiple queues, fill the 1386 * chn_table with the default channel to use it before subchannels are 1387 * opened. 1388 */ 1389 for (i = 0; i < VRSS_CHANNEL_MAX; i++) 1390 net_device->chn_table[i] = device->channel; 1391 1392 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is 1393 * populated. 1394 */ 1395 wmb(); 1396 1397 net_device_ctx->nvdev = net_device; 1398 1399 /* Connect with the NetVsp */ 1400 ret = netvsc_connect_vsp(device); 1401 if (ret != 0) { 1402 netdev_err(ndev, 1403 "unable to connect to NetVSP - %d\n", ret); 1404 goto close; 1405 } 1406 1407 return ret; 1408 1409 close: 1410 /* Now, we can close the channel safely */ 1411 vmbus_close(device->channel); 1412 1413 cleanup: 1414 free_netvsc_device(net_device); 1415 1416 return ret; 1417 } 1418