ntb_transport.c revision 289154
1/*- 2 * Copyright (C) 2013 Intel Corporation 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/ntb/if_ntb/if_ntb.c 289154 2015-10-11 20:59:02Z cem $"); 29 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/systm.h> 33#include <sys/bus.h> 34#include <sys/ktr.h> 35#include <sys/lock.h> 36#include <sys/malloc.h> 37#include <sys/module.h> 38#include <sys/mutex.h> 39#include <sys/queue.h> 40#include <sys/socket.h> 41#include <sys/sockio.h> 42#include <sys/taskqueue.h> 43#include <net/if.h> 44#include <net/if_media.h> 45#include <net/if_types.h> 46#include <net/if_var.h> 47#include <net/bpf.h> 48#include <net/ethernet.h> 49#include <vm/vm.h> 50#include <vm/pmap.h> 51#include <machine/bus.h> 52#include <machine/cpufunc.h> 53#include <machine/pmap.h> 54 55#include "../ntb_hw/ntb_hw.h" 56 57/* 58 * The Non-Transparent Bridge (NTB) is a device on some Intel processors that 59 * allows you to connect two systems using a PCI-e link. 60 * 61 * This module contains a protocol for sending and receiving messages, and 62 * exposes that protocol through a simulated ethernet device called ntb. 63 * 64 * NOTE: Much of the code in this module is shared with Linux. Any patches may 65 * be picked up and redistributed in Linux with a dual GPL/BSD license. 66 */ 67 68/* TODO: These functions should really be part of the kernel */ 69#define test_bit(pos, bitmap_addr) (*(bitmap_addr) & 1UL << (pos)) 70#define set_bit(pos, bitmap_addr) *(bitmap_addr) |= 1UL << (pos) 71#define clear_bit(pos, bitmap_addr) *(bitmap_addr) &= ~(1UL << (pos)) 72 73#define KTR_NTB KTR_SPARE3 74 75#define NTB_TRANSPORT_VERSION 3 76#define NTB_RX_MAX_PKTS 64 77#define NTB_RXQ_SIZE 300 78 79static unsigned int transport_mtu = 0x4000 + ETHER_HDR_LEN + ETHER_CRC_LEN; 80static unsigned int max_num_clients = 1; 81 82STAILQ_HEAD(ntb_queue_list, ntb_queue_entry); 83 84struct ntb_queue_entry { 85 /* ntb_queue list reference */ 86 STAILQ_ENTRY(ntb_queue_entry) entry; 87 88 /* info on data to be transfered */ 89 void *cb_data; 90 void *buf; 91 uint64_t len; 92 uint64_t flags; 93}; 94 95struct ntb_rx_info { 96 unsigned int entry; 97}; 98 99struct ntb_transport_qp { 100 struct ntb_netdev *transport; 101 struct ntb_softc *ntb; 102 103 void *cb_data; 104 105 bool client_ready; 106 bool qp_link; 107 uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */ 108 109 struct ntb_rx_info *rx_info; 110 struct ntb_rx_info *remote_rx_info; 111 112 void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, 113 void *data, int len); 114 struct ntb_queue_list tx_free_q; 115 struct mtx ntb_tx_free_q_lock; 116 void *tx_mw; 117 uint64_t tx_index; 118 uint64_t tx_max_entry; 119 uint64_t tx_max_frame; 120 121 void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, 122 void *data, int len); 123 struct ntb_queue_list rx_pend_q; 124 struct ntb_queue_list rx_free_q; 125 struct mtx ntb_rx_pend_q_lock; 126 struct mtx ntb_rx_free_q_lock; 127 struct task rx_completion_task; 128 void *rx_buff; 129 uint64_t rx_index; 130 uint64_t rx_max_entry; 131 uint64_t rx_max_frame; 132 133 void (*event_handler) (void *data, int status); 134 struct callout link_work; 135 struct callout queue_full; 136 struct callout rx_full; 137 138 uint64_t last_rx_no_buf; 139 140 /* Stats */ 141 uint64_t rx_bytes; 142 uint64_t rx_pkts; 143 uint64_t rx_ring_empty; 144 uint64_t rx_err_no_buf; 145 uint64_t rx_err_oflow; 146 uint64_t rx_err_ver; 147 uint64_t tx_bytes; 148 uint64_t tx_pkts; 149 uint64_t tx_ring_full; 150}; 151 152struct ntb_queue_handlers { 153 void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, 154 void *data, int len); 155 void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, 156 void *data, int len); 157 void (*event_handler) (void *data, int status); 158}; 159 160 161struct ntb_transport_mw { 162 size_t size; 163 void *virt_addr; 164 vm_paddr_t dma_addr; 165}; 166 167struct ntb_netdev { 168 struct ntb_softc *ntb; 169 struct ifnet *ifp; 170 struct ntb_transport_mw mw[NTB_NUM_MW]; 171 struct ntb_transport_qp *qps; 172 uint64_t max_qps; 173 uint64_t qp_bitmap; 174 bool transport_link; 175 struct callout link_work; 176 struct ntb_transport_qp *qp; 177 uint64_t bufsize; 178 u_char eaddr[ETHER_ADDR_LEN]; 179 struct mtx tx_lock; 180 struct mtx rx_lock; 181}; 182 183static struct ntb_netdev net_softc; 184 185enum { 186 IF_NTB_DESC_DONE_FLAG = 1 << 0, 187 IF_NTB_LINK_DOWN_FLAG = 1 << 1, 188}; 189 190struct ntb_payload_header { 191 uint64_t ver; 192 uint64_t len; 193 uint64_t flags; 194}; 195 196enum { 197 /* 198 * The order of this enum is part of the if_ntb remote protocol. Do 199 * not reorder without bumping protocol version (and it's probably best 200 * to keep the protocol in lock-step with the Linux NTB driver. 201 */ 202 IF_NTB_VERSION = 0, 203 IF_NTB_QP_LINKS, 204 IF_NTB_NUM_QPS, 205 IF_NTB_NUM_MWS, 206 /* 207 * N.B.: transport_link_work assumes MW1 enums = MW0 + 2. 208 */ 209 IF_NTB_MW0_SZ_HIGH, 210 IF_NTB_MW0_SZ_LOW, 211 IF_NTB_MW1_SZ_HIGH, 212 IF_NTB_MW1_SZ_LOW, 213 IF_NTB_MAX_SPAD, 214}; 215 216#define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) 217#define NTB_QP_DEF_NUM_ENTRIES 100 218#define NTB_LINK_DOWN_TIMEOUT 10 219 220static int ntb_handle_module_events(struct module *m, int what, void *arg); 221static int ntb_setup_interface(void); 222static int ntb_teardown_interface(void); 223static void ntb_net_init(void *arg); 224static int ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data); 225static void ntb_start(struct ifnet *ifp); 226static void ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, 227 void *data, int len); 228static void ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, 229 void *data, int len); 230static void ntb_net_event_handler(void *data, int status); 231static int ntb_transport_init(struct ntb_softc *ntb); 232static void ntb_transport_free(void *transport); 233static void ntb_transport_init_queue(struct ntb_netdev *nt, 234 unsigned int qp_num); 235static void ntb_transport_free_queue(struct ntb_transport_qp *qp); 236static struct ntb_transport_qp * ntb_transport_create_queue(void *data, 237 struct ntb_softc *pdev, const struct ntb_queue_handlers *handlers); 238static void ntb_transport_link_up(struct ntb_transport_qp *qp); 239static int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, 240 void *data, unsigned int len); 241static int ntb_process_tx(struct ntb_transport_qp *qp, 242 struct ntb_queue_entry *entry); 243static void ntb_tx_copy_task(struct ntb_transport_qp *qp, 244 struct ntb_queue_entry *entry, void *offset); 245static void ntb_qp_full(void *arg); 246static void ntb_transport_rxc_db(void *data, int db_num); 247static void ntb_rx_pendq_full(void *arg); 248static void ntb_transport_rx(struct ntb_transport_qp *qp); 249static int ntb_process_rxc(struct ntb_transport_qp *qp); 250static void ntb_rx_copy_task(struct ntb_transport_qp *qp, 251 struct ntb_queue_entry *entry, void *offset); 252static void ntb_rx_completion_task(void *arg, int pending); 253static void ntb_transport_event_callback(void *data, enum ntb_hw_event event); 254static void ntb_transport_link_work(void *arg); 255static int ntb_set_mw(struct ntb_netdev *nt, int num_mw, unsigned int size); 256static void ntb_free_mw(struct ntb_netdev *nt, int num_mw); 257static void ntb_transport_setup_qp_mw(struct ntb_netdev *nt, 258 unsigned int qp_num); 259static void ntb_qp_link_work(void *arg); 260static void ntb_transport_link_cleanup(struct ntb_netdev *nt); 261static void ntb_qp_link_down(struct ntb_transport_qp *qp); 262static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp); 263static void ntb_transport_link_down(struct ntb_transport_qp *qp); 264static void ntb_send_link_down(struct ntb_transport_qp *qp); 265static void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 266 struct ntb_queue_list *list); 267static struct ntb_queue_entry *ntb_list_rm(struct mtx *lock, 268 struct ntb_queue_list *list); 269static void create_random_local_eui48(u_char *eaddr); 270static unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp); 271 272MALLOC_DEFINE(M_NTB_IF, "if_ntb", "ntb network driver"); 273 274/* Module setup and teardown */ 275static int 276ntb_handle_module_events(struct module *m, int what, void *arg) 277{ 278 int err = 0; 279 280 switch (what) { 281 case MOD_LOAD: 282 err = ntb_setup_interface(); 283 break; 284 case MOD_UNLOAD: 285 err = ntb_teardown_interface(); 286 break; 287 default: 288 err = EOPNOTSUPP; 289 break; 290 } 291 return (err); 292} 293 294static moduledata_t if_ntb_mod = { 295 "if_ntb", 296 ntb_handle_module_events, 297 NULL 298}; 299 300DECLARE_MODULE(if_ntb, if_ntb_mod, SI_SUB_KLD, SI_ORDER_ANY); 301MODULE_DEPEND(if_ntb, ntb_hw, 1, 1, 1); 302 303static int 304ntb_setup_interface() 305{ 306 struct ifnet *ifp; 307 struct ntb_queue_handlers handlers = { ntb_net_rx_handler, 308 ntb_net_tx_handler, ntb_net_event_handler }; 309 310 net_softc.ntb = devclass_get_softc(devclass_find("ntb_hw"), 0); 311 if (net_softc.ntb == NULL) { 312 printf("ntb: Cannot find devclass\n"); 313 return (ENXIO); 314 } 315 316 ntb_transport_init(net_softc.ntb); 317 318 ifp = net_softc.ifp = if_alloc(IFT_ETHER); 319 if (ifp == NULL) { 320 printf("ntb: cannot allocate ifnet structure\n"); 321 return (ENOMEM); 322 } 323 324 net_softc.qp = ntb_transport_create_queue(ifp, net_softc.ntb, 325 &handlers); 326 if_initname(ifp, "ntb", 0); 327 ifp->if_init = ntb_net_init; 328 ifp->if_softc = &net_softc; 329 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 330 ifp->if_ioctl = ntb_ioctl; 331 ifp->if_start = ntb_start; 332 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 333 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 334 IFQ_SET_READY(&ifp->if_snd); 335 create_random_local_eui48(net_softc.eaddr); 336 ether_ifattach(ifp, net_softc.eaddr); 337 ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_JUMBO_MTU; 338 ifp->if_capenable = ifp->if_capabilities; 339 340 ntb_transport_link_up(net_softc.qp); 341 net_softc.bufsize = ntb_transport_max_size(net_softc.qp) + 342 sizeof(struct ether_header); 343 return (0); 344} 345 346static int 347ntb_teardown_interface() 348{ 349 350 if (net_softc.qp != NULL) 351 ntb_transport_link_down(net_softc.qp); 352 353 if (net_softc.ifp != NULL) { 354 ether_ifdetach(net_softc.ifp); 355 if_free(net_softc.ifp); 356 } 357 358 if (net_softc.qp != NULL) { 359 ntb_transport_free_queue(net_softc.qp); 360 ntb_transport_free(&net_softc); 361 } 362 363 return (0); 364} 365 366/* Network device interface */ 367 368static void 369ntb_net_init(void *arg) 370{ 371 struct ntb_netdev *ntb_softc = arg; 372 struct ifnet *ifp = ntb_softc->ifp; 373 374 ifp->if_drv_flags |= IFF_DRV_RUNNING; 375 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 376 ifp->if_flags |= IFF_UP; 377 if_link_state_change(ifp, LINK_STATE_UP); 378} 379 380static int 381ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 382{ 383 struct ntb_netdev *nt = ifp->if_softc; 384 struct ifreq *ifr = (struct ifreq *)data; 385 int error = 0; 386 387 switch (command) { 388 case SIOCSIFMTU: 389 { 390 if (ifr->ifr_mtu > ntb_transport_max_size(nt->qp) - 391 ETHER_HDR_LEN - ETHER_CRC_LEN) { 392 error = EINVAL; 393 break; 394 } 395 396 ifp->if_mtu = ifr->ifr_mtu; 397 break; 398 } 399 default: 400 error = ether_ioctl(ifp, command, data); 401 break; 402 } 403 404 return (error); 405} 406 407 408static void 409ntb_start(struct ifnet *ifp) 410{ 411 struct mbuf *m_head; 412 struct ntb_netdev *nt = ifp->if_softc; 413 int rc; 414 415 mtx_lock(&nt->tx_lock); 416 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 417 CTR0(KTR_NTB, "TX: ntb_start"); 418 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 419 IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head); 420 CTR1(KTR_NTB, "TX: start mbuf %p", m_head); 421 rc = ntb_transport_tx_enqueue(nt->qp, m_head, m_head, 422 m_length(m_head, NULL)); 423 if (rc != 0) { 424 CTR1(KTR_NTB, 425 "TX: could not tx mbuf %p. Returning to snd q", 426 m_head); 427 if (rc == EAGAIN) { 428 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 429 IFQ_DRV_PREPEND(&ifp->if_snd, m_head); 430 callout_reset(&nt->qp->queue_full, hz / 1000, 431 ntb_qp_full, ifp); 432 } 433 break; 434 } 435 436 } 437 mtx_unlock(&nt->tx_lock); 438} 439 440/* Network Device Callbacks */ 441static void 442ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 443 int len) 444{ 445 446 m_freem(data); 447 CTR1(KTR_NTB, "TX: tx_handler freeing mbuf %p", data); 448} 449 450static void 451ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 452 int len) 453{ 454 struct mbuf *m = data; 455 struct ifnet *ifp = qp_data; 456 457 CTR0(KTR_NTB, "RX: rx handler"); 458 (*ifp->if_input)(ifp, m); 459} 460 461static void 462ntb_net_event_handler(void *data, int status) 463{ 464 465} 466 467/* Transport Init and teardown */ 468 469static int 470ntb_transport_init(struct ntb_softc *ntb) 471{ 472 struct ntb_netdev *nt = &net_softc; 473 int rc, i; 474 475 nt->max_qps = max_num_clients; 476 ntb_register_transport(ntb, nt); 477 mtx_init(&nt->tx_lock, "ntb transport tx", NULL, MTX_DEF); 478 mtx_init(&nt->rx_lock, "ntb transport rx", NULL, MTX_DEF); 479 480 nt->qps = malloc(nt->max_qps * sizeof(struct ntb_transport_qp), 481 M_NTB_IF, M_WAITOK|M_ZERO); 482 483 nt->qp_bitmap = ((uint64_t) 1 << nt->max_qps) - 1; 484 485 for (i = 0; i < nt->max_qps; i++) 486 ntb_transport_init_queue(nt, i); 487 488 callout_init(&nt->link_work, 0); 489 490 rc = ntb_register_event_callback(ntb, 491 ntb_transport_event_callback); 492 if (rc != 0) 493 goto err; 494 495 if (ntb_query_link_status(ntb)) { 496 if (bootverbose) 497 device_printf(ntb_get_device(ntb), "link up\n"); 498 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 499 } 500 501 return (0); 502 503err: 504 free(nt->qps, M_NTB_IF); 505 ntb_unregister_transport(ntb); 506 return (rc); 507} 508 509static void 510ntb_transport_free(void *transport) 511{ 512 struct ntb_netdev *nt = transport; 513 struct ntb_softc *ntb = nt->ntb; 514 int i; 515 516 nt->transport_link = NTB_LINK_DOWN; 517 518 callout_drain(&nt->link_work); 519 520 /* verify that all the qps are freed */ 521 for (i = 0; i < nt->max_qps; i++) 522 if (!test_bit(i, &nt->qp_bitmap)) 523 ntb_transport_free_queue(&nt->qps[i]); 524 525 526 ntb_unregister_event_callback(ntb); 527 528 for (i = 0; i < NTB_NUM_MW; i++) 529 ntb_free_mw(nt, i); 530 531 free(nt->qps, M_NTB_IF); 532 ntb_unregister_transport(ntb); 533} 534 535static void 536ntb_transport_init_queue(struct ntb_netdev *nt, unsigned int qp_num) 537{ 538 struct ntb_transport_qp *qp; 539 unsigned int num_qps_mw, tx_size; 540 uint8_t mw_num = QP_TO_MW(qp_num); 541 542 qp = &nt->qps[qp_num]; 543 qp->qp_num = qp_num; 544 qp->transport = nt; 545 qp->ntb = nt->ntb; 546 qp->qp_link = NTB_LINK_DOWN; 547 qp->client_ready = NTB_LINK_DOWN; 548 qp->event_handler = NULL; 549 550 if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) 551 num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; 552 else 553 num_qps_mw = nt->max_qps / NTB_NUM_MW; 554 555 tx_size = (unsigned int) ntb_get_mw_size(qp->ntb, mw_num) / num_qps_mw; 556 qp->rx_info = (struct ntb_rx_info *) 557 ((char *)ntb_get_mw_vbase(qp->ntb, mw_num) + 558 (qp_num / NTB_NUM_MW * tx_size)); 559 tx_size -= sizeof(struct ntb_rx_info); 560 561 qp->tx_mw = qp->rx_info + 1; 562 qp->tx_max_frame = min(transport_mtu + sizeof(struct ntb_payload_header), 563 tx_size); 564 qp->tx_max_entry = tx_size / qp->tx_max_frame; 565 qp->tx_index = 0; 566 567 callout_init(&qp->link_work, 0); 568 callout_init(&qp->queue_full, 1); 569 callout_init(&qp->rx_full, 1); 570 571 mtx_init(&qp->ntb_rx_pend_q_lock, "ntb rx pend q", NULL, MTX_SPIN); 572 mtx_init(&qp->ntb_rx_free_q_lock, "ntb rx free q", NULL, MTX_SPIN); 573 mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN); 574 TASK_INIT(&qp->rx_completion_task, 0, ntb_rx_completion_task, qp); 575 576 STAILQ_INIT(&qp->rx_pend_q); 577 STAILQ_INIT(&qp->rx_free_q); 578 STAILQ_INIT(&qp->tx_free_q); 579} 580 581static void 582ntb_transport_free_queue(struct ntb_transport_qp *qp) 583{ 584 struct ntb_queue_entry *entry; 585 586 if (qp == NULL) 587 return; 588 589 callout_drain(&qp->link_work); 590 591 ntb_unregister_db_callback(qp->ntb, qp->qp_num); 592 593 while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 594 free(entry, M_NTB_IF); 595 596 while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) 597 free(entry, M_NTB_IF); 598 599 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 600 free(entry, M_NTB_IF); 601 602 set_bit(qp->qp_num, &qp->transport->qp_bitmap); 603} 604 605/** 606 * ntb_transport_create_queue - Create a new NTB transport layer queue 607 * @rx_handler: receive callback function 608 * @tx_handler: transmit callback function 609 * @event_handler: event callback function 610 * 611 * Create a new NTB transport layer queue and provide the queue with a callback 612 * routine for both transmit and receive. The receive callback routine will be 613 * used to pass up data when the transport has received it on the queue. The 614 * transmit callback routine will be called when the transport has completed the 615 * transmission of the data on the queue and the data is ready to be freed. 616 * 617 * RETURNS: pointer to newly created ntb_queue, NULL on error. 618 */ 619static struct ntb_transport_qp * 620ntb_transport_create_queue(void *data, struct ntb_softc *pdev, 621 const struct ntb_queue_handlers *handlers) 622{ 623 struct ntb_queue_entry *entry; 624 struct ntb_transport_qp *qp; 625 struct ntb_netdev *nt; 626 unsigned int free_queue; 627 int rc, i; 628 629 nt = ntb_find_transport(pdev); 630 if (nt == NULL) 631 goto err; 632 633 free_queue = ffs(nt->qp_bitmap); 634 if (free_queue == 0) 635 goto err; 636 637 /* decrement free_queue to make it zero based */ 638 free_queue--; 639 640 clear_bit(free_queue, &nt->qp_bitmap); 641 642 qp = &nt->qps[free_queue]; 643 qp->cb_data = data; 644 qp->rx_handler = handlers->rx_handler; 645 qp->tx_handler = handlers->tx_handler; 646 qp->event_handler = handlers->event_handler; 647 648 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 649 entry = malloc(sizeof(struct ntb_queue_entry), M_NTB_IF, 650 M_WAITOK|M_ZERO); 651 entry->cb_data = nt->ifp; 652 entry->buf = NULL; 653 entry->len = transport_mtu; 654 ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 655 } 656 657 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 658 entry = malloc(sizeof(struct ntb_queue_entry), M_NTB_IF, 659 M_WAITOK|M_ZERO); 660 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 661 } 662 663 rc = ntb_register_db_callback(qp->ntb, free_queue, qp, 664 ntb_transport_rxc_db); 665 if (rc != 0) 666 goto err1; 667 668 return (qp); 669 670err1: 671 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 672 free(entry, M_NTB_IF); 673 while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 674 free(entry, M_NTB_IF); 675 set_bit(free_queue, &nt->qp_bitmap); 676err: 677 return (NULL); 678} 679 680/** 681 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue 682 * @qp: NTB transport layer queue to be enabled 683 * 684 * Notify NTB transport layer of client readiness to use queue 685 */ 686static void 687ntb_transport_link_up(struct ntb_transport_qp *qp) 688{ 689 690 if (qp == NULL) 691 return; 692 693 qp->client_ready = NTB_LINK_UP; 694 if (bootverbose) 695 device_printf(ntb_get_device(qp->ntb), "qp client ready\n"); 696 697 if (qp->transport->transport_link == NTB_LINK_UP) 698 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 699} 700 701 702 703/* Transport Tx */ 704 705/** 706 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry 707 * @qp: NTB transport layer queue the entry is to be enqueued on 708 * @cb: per buffer pointer for callback function to use 709 * @data: pointer to data buffer that will be sent 710 * @len: length of the data buffer 711 * 712 * Enqueue a new transmit buffer onto the transport queue from which a NTB 713 * payload will be transmitted. This assumes that a lock is behing held to 714 * serialize access to the qp. 715 * 716 * RETURNS: An appropriate ERRNO error value on error, or zero for success. 717 */ 718static int 719ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, 720 unsigned int len) 721{ 722 struct ntb_queue_entry *entry; 723 int rc; 724 725 if (qp == NULL || qp->qp_link != NTB_LINK_UP || len == 0) { 726 CTR0(KTR_NTB, "TX: link not up"); 727 return (EINVAL); 728 } 729 730 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 731 if (entry == NULL) { 732 CTR0(KTR_NTB, "TX: could not get entry from tx_free_q"); 733 return (ENOMEM); 734 } 735 CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry); 736 737 entry->cb_data = cb; 738 entry->buf = data; 739 entry->len = len; 740 entry->flags = 0; 741 742 rc = ntb_process_tx(qp, entry); 743 if (rc != 0) { 744 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 745 CTR1(KTR_NTB, 746 "TX: process_tx failed. Returning entry %p to tx_free_q", 747 entry); 748 } 749 return (rc); 750} 751 752static int 753ntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry) 754{ 755 void *offset; 756 757 offset = (char *)qp->tx_mw + qp->tx_max_frame * qp->tx_index; 758 CTR3(KTR_NTB, 759 "TX: process_tx: tx_pkts=%u, tx_index=%u, remote entry=%u", 760 qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry); 761 if (qp->tx_index == qp->remote_rx_info->entry) { 762 CTR0(KTR_NTB, "TX: ring full"); 763 qp->tx_ring_full++; 764 return (EAGAIN); 765 } 766 767 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { 768 if (qp->tx_handler != NULL) 769 qp->tx_handler(qp, qp->cb_data, entry->buf, 770 EIO); 771 772 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 773 CTR1(KTR_NTB, 774 "TX: frame too big. returning entry %p to tx_free_q", 775 entry); 776 return (0); 777 } 778 CTR2(KTR_NTB, "TX: copying entry %p to offset %p", entry, offset); 779 ntb_tx_copy_task(qp, entry, offset); 780 781 qp->tx_index++; 782 qp->tx_index %= qp->tx_max_entry; 783 784 qp->tx_pkts++; 785 786 return (0); 787} 788 789static void 790ntb_tx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 791 void *offset) 792{ 793 struct ntb_payload_header *hdr; 794 795 CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset); 796 if (entry->buf != NULL) 797 m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset); 798 799 hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame - 800 sizeof(struct ntb_payload_header)); 801 hdr->len = entry->len; /* TODO: replace with bus_space_write */ 802 hdr->ver = qp->tx_pkts; /* TODO: replace with bus_space_write */ 803 wmb(); 804 /* TODO: replace with bus_space_write */ 805 hdr->flags = entry->flags | IF_NTB_DESC_DONE_FLAG; 806 807 ntb_ring_sdb(qp->ntb, qp->qp_num); 808 809 /* 810 * The entry length can only be zero if the packet is intended to be a 811 * "link down" or similar. Since no payload is being sent in these 812 * cases, there is nothing to add to the completion queue. 813 */ 814 if (entry->len > 0) { 815 qp->tx_bytes += entry->len; 816 817 if (qp->tx_handler) 818 qp->tx_handler(qp, qp->cb_data, entry->cb_data, 819 entry->len); 820 } 821 822 CTR2(KTR_NTB, 823 "TX: entry %p sent. hdr->ver = %d, Returning to tx_free_q", entry, 824 hdr->ver); 825 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 826} 827 828static void 829ntb_qp_full(void *arg) 830{ 831 832 CTR0(KTR_NTB, "TX: qp_full callout"); 833 ntb_start(arg); 834} 835 836/* Transport Rx */ 837static void 838ntb_transport_rxc_db(void *data, int db_num) 839{ 840 struct ntb_transport_qp *qp = data; 841 842 ntb_transport_rx(qp); 843} 844 845static void 846ntb_rx_pendq_full(void *arg) 847{ 848 849 CTR0(KTR_NTB, "RX: ntb_rx_pendq_full callout"); 850 ntb_transport_rx(arg); 851} 852 853static void 854ntb_transport_rx(struct ntb_transport_qp *qp) 855{ 856 int rc, i; 857 858 /* 859 * Limit the number of packets processed in a single interrupt to 860 * provide fairness to others 861 */ 862 mtx_lock(&qp->transport->rx_lock); 863 CTR0(KTR_NTB, "RX: transport_rx"); 864 for (i = 0; i < NTB_RX_MAX_PKTS; i++) { 865 rc = ntb_process_rxc(qp); 866 if (rc != 0) { 867 CTR0(KTR_NTB, "RX: process_rxc failed"); 868 break; 869 } 870 } 871 mtx_unlock(&qp->transport->rx_lock); 872} 873 874static int 875ntb_process_rxc(struct ntb_transport_qp *qp) 876{ 877 struct ntb_payload_header *hdr; 878 struct ntb_queue_entry *entry; 879 void *offset; 880 881 offset = (void *) 882 ((char *)qp->rx_buff + qp->rx_max_frame * qp->rx_index); 883 hdr = (void *) 884 ((char *)offset + qp->rx_max_frame - 885 sizeof(struct ntb_payload_header)); 886 887 CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index); 888 entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); 889 if (entry == NULL) { 890 qp->rx_err_no_buf++; 891 CTR0(KTR_NTB, "RX: No entries in rx_pend_q"); 892 return (ENOMEM); 893 } 894 callout_stop(&qp->rx_full); 895 CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry); 896 897 if ((hdr->flags & IF_NTB_DESC_DONE_FLAG) == 0) { 898 CTR1(KTR_NTB, 899 "RX: hdr not done. Returning entry %p to rx_pend_q", entry); 900 ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 901 qp->rx_ring_empty++; 902 return (EAGAIN); 903 } 904 905 if (hdr->ver != (uint32_t) qp->rx_pkts) { 906 CTR3(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). " 907 "Returning entry %p to rx_pend_q", hdr->ver, qp->rx_pkts, 908 entry); 909 ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 910 qp->rx_err_ver++; 911 return (EIO); 912 } 913 914 if ((hdr->flags & IF_NTB_LINK_DOWN_FLAG) != 0) { 915 ntb_qp_link_down(qp); 916 CTR1(KTR_NTB, 917 "RX: link down. adding entry %p back to rx_pend_q", entry); 918 ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 919 goto out; 920 } 921 922 if (hdr->len <= entry->len) { 923 entry->len = hdr->len; 924 ntb_rx_copy_task(qp, entry, offset); 925 } else { 926 CTR1(KTR_NTB, 927 "RX: len too long. Returning entry %p to rx_pend_q", entry); 928 ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 929 930 qp->rx_err_oflow++; 931 } 932 933 qp->rx_bytes += hdr->len; 934 qp->rx_pkts++; 935 CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts); 936 937 938out: 939 /* Ensure that the data is globally visible before clearing the flag */ 940 wmb(); 941 hdr->flags = 0; 942 /* TODO: replace with bus_space_write */ 943 qp->rx_info->entry = qp->rx_index; 944 945 qp->rx_index++; 946 qp->rx_index %= qp->rx_max_entry; 947 948 return (0); 949} 950 951static void 952ntb_rx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 953 void *offset) 954{ 955 struct ifnet *ifp = entry->cb_data; 956 unsigned int len = entry->len; 957 struct mbuf *m; 958 959 CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset); 960 m = m_devget(offset, len, 0, ifp, NULL); 961 m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID; 962 963 entry->buf = (void *)m; 964 965 CTR2(KTR_NTB, 966 "RX: copied entry %p to mbuf %p. Adding entry to rx_free_q", entry, 967 m); 968 ntb_list_add(&qp->ntb_rx_free_q_lock, entry, &qp->rx_free_q); 969 970 taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 971} 972 973static void 974ntb_rx_completion_task(void *arg, int pending) 975{ 976 struct ntb_transport_qp *qp = arg; 977 struct mbuf *m; 978 struct ntb_queue_entry *entry; 979 980 CTR0(KTR_NTB, "RX: rx_completion_task"); 981 982 while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) { 983 m = entry->buf; 984 CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m); 985 if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) 986 qp->rx_handler(qp, qp->cb_data, m, entry->len); 987 988 entry->buf = NULL; 989 entry->len = qp->transport->bufsize; 990 991 CTR1(KTR_NTB,"RX: entry %p removed from rx_free_q " 992 "and added to rx_pend_q", entry); 993 ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 994 if (qp->rx_err_no_buf > qp->last_rx_no_buf) { 995 qp->last_rx_no_buf = qp->rx_err_no_buf; 996 CTR0(KTR_NTB, "RX: could spawn rx task"); 997 callout_reset(&qp->rx_full, hz / 1000, ntb_rx_pendq_full, 998 qp); 999 } 1000 } 1001} 1002 1003/* Link Event handler */ 1004static void 1005ntb_transport_event_callback(void *data, enum ntb_hw_event event) 1006{ 1007 struct ntb_netdev *nt = data; 1008 1009 switch (event) { 1010 case NTB_EVENT_HW_LINK_UP: 1011 if (bootverbose) 1012 device_printf(ntb_get_device(nt->ntb), "HW link up\n"); 1013 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 1014 break; 1015 case NTB_EVENT_HW_LINK_DOWN: 1016 if (bootverbose) 1017 device_printf(ntb_get_device(nt->ntb), "HW link down\n"); 1018 ntb_transport_link_cleanup(nt); 1019 break; 1020 default: 1021 panic("ntb: Unknown NTB event"); 1022 } 1023} 1024 1025/* Link bring up */ 1026static void 1027ntb_transport_link_work(void *arg) 1028{ 1029 struct ntb_netdev *nt = arg; 1030 struct ntb_softc *ntb = nt->ntb; 1031 struct ntb_transport_qp *qp; 1032 uint64_t val64; 1033 uint32_t val; 1034 int rc, i; 1035 1036 /* send the local info, in the opposite order of the way we read it */ 1037 for (i = 0; i < NTB_NUM_MW; i++) { 1038 rc = ntb_write_remote_spad(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1039 ntb_get_mw_size(ntb, i) >> 32); 1040 if (rc != 0) 1041 goto out; 1042 1043 rc = ntb_write_remote_spad(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), 1044 (uint32_t)ntb_get_mw_size(ntb, i)); 1045 if (rc != 0) 1046 goto out; 1047 } 1048 1049 rc = ntb_write_remote_spad(ntb, IF_NTB_NUM_MWS, NTB_NUM_MW); 1050 if (rc != 0) 1051 goto out; 1052 1053 rc = ntb_write_remote_spad(ntb, IF_NTB_NUM_QPS, nt->max_qps); 1054 if (rc != 0) 1055 goto out; 1056 1057 rc = ntb_write_remote_spad(ntb, IF_NTB_VERSION, NTB_TRANSPORT_VERSION); 1058 if (rc != 0) 1059 goto out; 1060 1061 /* Query the remote side for its info */ 1062 rc = ntb_read_local_spad(ntb, IF_NTB_VERSION, &val); 1063 if (rc != 0) 1064 goto out; 1065 1066 if (val != NTB_TRANSPORT_VERSION) 1067 goto out; 1068 1069 rc = ntb_read_local_spad(ntb, IF_NTB_NUM_QPS, &val); 1070 if (rc != 0) 1071 goto out; 1072 1073 if (val != nt->max_qps) 1074 goto out; 1075 1076 rc = ntb_read_local_spad(ntb, IF_NTB_NUM_MWS, &val); 1077 if (rc != 0) 1078 goto out; 1079 1080 if (val != NTB_NUM_MW) 1081 goto out; 1082 1083 for (i = 0; i < NTB_NUM_MW; i++) { 1084 rc = ntb_read_local_spad(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1085 &val); 1086 if (rc != 0) 1087 goto free_mws; 1088 1089 val64 = (uint64_t)val << 32; 1090 1091 rc = ntb_read_local_spad(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), 1092 &val); 1093 if (rc != 0) 1094 goto free_mws; 1095 1096 val64 |= val; 1097 1098 rc = ntb_set_mw(nt, i, val64); 1099 if (rc != 0) 1100 goto free_mws; 1101 } 1102 1103 nt->transport_link = NTB_LINK_UP; 1104 if (bootverbose) 1105 device_printf(ntb_get_device(ntb), "transport link up\n"); 1106 1107 for (i = 0; i < nt->max_qps; i++) { 1108 qp = &nt->qps[i]; 1109 1110 ntb_transport_setup_qp_mw(nt, i); 1111 1112 if (qp->client_ready == NTB_LINK_UP) 1113 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 1114 } 1115 1116 return; 1117 1118free_mws: 1119 for (i = 0; i < NTB_NUM_MW; i++) 1120 ntb_free_mw(nt, i); 1121out: 1122 if (ntb_query_link_status(ntb)) 1123 callout_reset(&nt->link_work, 1124 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt); 1125} 1126 1127static int 1128ntb_set_mw(struct ntb_netdev *nt, int num_mw, unsigned int size) 1129{ 1130 struct ntb_transport_mw *mw = &nt->mw[num_mw]; 1131 1132 /* No need to re-setup */ 1133 if (mw->size == size) 1134 return (0); 1135 1136 if (mw->size != 0) 1137 ntb_free_mw(nt, num_mw); 1138 1139 /* Alloc memory for receiving data. Must be 4k aligned */ 1140 mw->size = size; 1141 1142 mw->virt_addr = contigmalloc(mw->size, M_NTB_IF, M_ZERO, 0, 1143 BUS_SPACE_MAXADDR, mw->size, 0); 1144 if (mw->virt_addr == NULL) { 1145 mw->size = 0; 1146 printf("ntb: Unable to allocate MW buffer of size %d\n", 1147 (int)mw->size); 1148 return (ENOMEM); 1149 } 1150 /* TODO: replace with bus_space_* functions */ 1151 mw->dma_addr = vtophys(mw->virt_addr); 1152 1153 /* Notify HW the memory location of the receive buffer */ 1154 ntb_set_mw_addr(nt->ntb, num_mw, mw->dma_addr); 1155 1156 return (0); 1157} 1158 1159static void 1160ntb_free_mw(struct ntb_netdev *nt, int num_mw) 1161{ 1162 struct ntb_transport_mw *mw = &nt->mw[num_mw]; 1163 1164 if (mw->virt_addr == NULL) 1165 return; 1166 1167 contigfree(mw->virt_addr, mw->size, M_NTB_IF); 1168 mw->virt_addr = NULL; 1169} 1170 1171static void 1172ntb_transport_setup_qp_mw(struct ntb_netdev *nt, unsigned int qp_num) 1173{ 1174 struct ntb_transport_qp *qp = &nt->qps[qp_num]; 1175 void *offset; 1176 unsigned int rx_size, num_qps_mw; 1177 uint8_t mw_num = QP_TO_MW(qp_num); 1178 unsigned int i; 1179 1180 if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) 1181 num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; 1182 else 1183 num_qps_mw = nt->max_qps / NTB_NUM_MW; 1184 1185 rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; 1186 qp->remote_rx_info = (void *)((uint8_t *)nt->mw[mw_num].virt_addr + 1187 (qp_num / NTB_NUM_MW * rx_size)); 1188 rx_size -= sizeof(struct ntb_rx_info); 1189 1190 qp->rx_buff = qp->remote_rx_info + 1; 1191 qp->rx_max_frame = min(transport_mtu + sizeof(struct ntb_payload_header), 1192 rx_size); 1193 qp->rx_max_entry = rx_size / qp->rx_max_frame; 1194 qp->rx_index = 0; 1195 qp->tx_index = 0; 1196 1197 qp->remote_rx_info->entry = qp->rx_max_entry; 1198 1199 /* setup the hdr offsets with 0's */ 1200 for (i = 0; i < qp->rx_max_entry; i++) { 1201 offset = (void *)((uint8_t *)qp->rx_buff + 1202 qp->rx_max_frame * (i + 1) - 1203 sizeof(struct ntb_payload_header)); 1204 memset(offset, 0, sizeof(struct ntb_payload_header)); 1205 } 1206 1207 qp->rx_pkts = 0; 1208 qp->tx_pkts = 0; 1209} 1210 1211static void 1212ntb_qp_link_work(void *arg) 1213{ 1214 struct ntb_transport_qp *qp = arg; 1215 struct ntb_softc *ntb = qp->ntb; 1216 struct ntb_netdev *nt = qp->transport; 1217 int rc, val; 1218 1219 1220 rc = ntb_read_remote_spad(ntb, IF_NTB_QP_LINKS, &val); 1221 if (rc != 0) 1222 return; 1223 1224 rc = ntb_write_remote_spad(ntb, IF_NTB_QP_LINKS, val | 1 << qp->qp_num); 1225 1226 /* query remote spad for qp ready bits */ 1227 rc = ntb_read_local_spad(ntb, IF_NTB_QP_LINKS, &val); 1228 1229 /* See if the remote side is up */ 1230 if ((1 << qp->qp_num & val) != 0) { 1231 qp->qp_link = NTB_LINK_UP; 1232 if (qp->event_handler != NULL) 1233 qp->event_handler(qp->cb_data, NTB_LINK_UP); 1234 if (bootverbose) 1235 device_printf(ntb_get_device(ntb), "qp link up\n"); 1236 } else if (nt->transport_link == NTB_LINK_UP) { 1237 callout_reset(&qp->link_work, 1238 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1239 } 1240} 1241 1242/* Link down event*/ 1243static void 1244ntb_transport_link_cleanup(struct ntb_netdev *nt) 1245{ 1246 int i; 1247 1248 if (nt->transport_link == NTB_LINK_DOWN) 1249 callout_drain(&nt->link_work); 1250 else 1251 nt->transport_link = NTB_LINK_DOWN; 1252 1253 /* Pass along the info to any clients */ 1254 for (i = 0; i < nt->max_qps; i++) 1255 if (!test_bit(i, &nt->qp_bitmap)) 1256 ntb_qp_link_down(&nt->qps[i]); 1257 1258 /* 1259 * The scratchpad registers keep the values if the remote side 1260 * goes down, blast them now to give them a sane value the next 1261 * time they are accessed 1262 */ 1263 for (i = 0; i < IF_NTB_MAX_SPAD; i++) 1264 ntb_write_local_spad(nt->ntb, i, 0); 1265} 1266 1267 1268static void 1269ntb_qp_link_down(struct ntb_transport_qp *qp) 1270{ 1271 1272 ntb_qp_link_cleanup(qp); 1273} 1274 1275static void 1276ntb_qp_link_cleanup(struct ntb_transport_qp *qp) 1277{ 1278 struct ntb_netdev *nt = qp->transport; 1279 1280 if (qp->qp_link == NTB_LINK_DOWN) { 1281 callout_drain(&qp->link_work); 1282 return; 1283 } 1284 1285 if (qp->event_handler != NULL) 1286 qp->event_handler(qp->cb_data, NTB_LINK_DOWN); 1287 1288 qp->qp_link = NTB_LINK_DOWN; 1289 1290 if (nt->transport_link == NTB_LINK_UP) 1291 callout_reset(&qp->link_work, 1292 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1293} 1294 1295/* Link commanded down */ 1296/** 1297 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data 1298 * @qp: NTB transport layer queue to be disabled 1299 * 1300 * Notify NTB transport layer of client's desire to no longer receive data on 1301 * transport queue specified. It is the client's responsibility to ensure all 1302 * entries on queue are purged or otherwise handled appropraitely. 1303 */ 1304static void 1305ntb_transport_link_down(struct ntb_transport_qp *qp) 1306{ 1307 int rc, val; 1308 1309 if (qp == NULL) 1310 return; 1311 1312 qp->client_ready = NTB_LINK_DOWN; 1313 1314 rc = ntb_read_remote_spad(qp->ntb, IF_NTB_QP_LINKS, &val); 1315 if (rc != 0) 1316 return; 1317 1318 rc = ntb_write_remote_spad(qp->ntb, IF_NTB_QP_LINKS, 1319 val & ~(1 << qp->qp_num)); 1320 1321 if (qp->qp_link == NTB_LINK_UP) 1322 ntb_send_link_down(qp); 1323 else 1324 callout_drain(&qp->link_work); 1325 1326} 1327 1328static void 1329ntb_send_link_down(struct ntb_transport_qp *qp) 1330{ 1331 struct ntb_queue_entry *entry; 1332 int i, rc; 1333 1334 if (qp->qp_link == NTB_LINK_DOWN) 1335 return; 1336 1337 qp->qp_link = NTB_LINK_DOWN; 1338 1339 for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { 1340 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 1341 if (entry != NULL) 1342 break; 1343 pause("NTB Wait for link down", hz / 10); 1344 } 1345 1346 if (entry == NULL) 1347 return; 1348 1349 entry->cb_data = NULL; 1350 entry->buf = NULL; 1351 entry->len = 0; 1352 entry->flags = IF_NTB_LINK_DOWN_FLAG; 1353 1354 mtx_lock(&qp->transport->tx_lock); 1355 rc = ntb_process_tx(qp, entry); 1356 if (rc != 0) 1357 printf("ntb: Failed to send link down\n"); 1358 mtx_unlock(&qp->transport->tx_lock); 1359} 1360 1361 1362/* List Management */ 1363 1364static void 1365ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 1366 struct ntb_queue_list *list) 1367{ 1368 1369 mtx_lock_spin(lock); 1370 STAILQ_INSERT_TAIL(list, entry, entry); 1371 mtx_unlock_spin(lock); 1372} 1373 1374static struct ntb_queue_entry * 1375ntb_list_rm(struct mtx *lock, struct ntb_queue_list *list) 1376{ 1377 struct ntb_queue_entry *entry; 1378 1379 mtx_lock_spin(lock); 1380 if (STAILQ_EMPTY(list)) { 1381 entry = NULL; 1382 goto out; 1383 } 1384 entry = STAILQ_FIRST(list); 1385 STAILQ_REMOVE_HEAD(list, entry); 1386out: 1387 mtx_unlock_spin(lock); 1388 1389 return (entry); 1390} 1391 1392/* Helper functions */ 1393/* TODO: This too should really be part of the kernel */ 1394#define EUI48_MULTICAST 1 << 0 1395#define EUI48_LOCALLY_ADMINISTERED 1 << 1 1396static void 1397create_random_local_eui48(u_char *eaddr) 1398{ 1399 static uint8_t counter = 0; 1400 uint32_t seed = ticks; 1401 1402 eaddr[0] = EUI48_LOCALLY_ADMINISTERED; 1403 memcpy(&eaddr[1], &seed, sizeof(uint32_t)); 1404 eaddr[5] = counter++; 1405} 1406 1407/** 1408 * ntb_transport_max_size - Query the max payload size of a qp 1409 * @qp: NTB transport layer queue to be queried 1410 * 1411 * Query the maximum payload size permissible on the given qp 1412 * 1413 * RETURNS: the max payload size of a qp 1414 */ 1415static unsigned int 1416ntb_transport_max_size(struct ntb_transport_qp *qp) 1417{ 1418 1419 if (qp == NULL) 1420 return (0); 1421 1422 return (qp->tx_max_frame - sizeof(struct ntb_payload_header)); 1423} 1424