1 /*- 2 * Copyright (C) 2013 Intel Corporation 3 * Copyright (C) 2015 EMC Corporation 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/bitset.h> 35 #include <sys/bus.h> 36 #include <sys/ktr.h> 37 #include <sys/limits.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/module.h> 41 #include <sys/mutex.h> 42 #include <sys/queue.h> 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/sysctl.h> 46 #include <sys/taskqueue.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_types.h> 51 #include <net/if_var.h> 52 #include <net/bpf.h> 53 #include <net/ethernet.h> 54 55 #include <vm/vm.h> 56 #include <vm/pmap.h> 57 58 #include <machine/bus.h> 59 #include <machine/cpufunc.h> 60 61 #include <netinet/in.h> 62 #include <netinet/ip.h> 63 64 #include "../ntb_hw/ntb_hw.h" 65 66 /* 67 * The Non-Transparent Bridge (NTB) is a device on some Intel processors that 68 * allows you to connect two systems using a PCI-e link. 69 * 70 * This module contains a protocol for sending and receiving messages, and 71 * exposes that protocol through a simulated ethernet device called ntb. 72 * 73 * NOTE: Much of the code in this module is shared with Linux. Any patches may 74 * be picked up and redistributed in Linux with a dual GPL/BSD license. 75 */ 76 77 #define QP_SETSIZE 64 78 BITSET_DEFINE(_qpset, QP_SETSIZE); 79 #define test_bit(pos, addr) BIT_ISSET(QP_SETSIZE, (pos), (addr)) 80 #define set_bit(pos, addr) BIT_SET(QP_SETSIZE, (pos), (addr)) 81 #define clear_bit(pos, addr) BIT_CLR(QP_SETSIZE, (pos), (addr)) 82 #define ffs_bit(addr) BIT_FFS(QP_SETSIZE, (addr)) 83 84 #define KTR_NTB KTR_SPARE3 85 86 #define NTB_TRANSPORT_VERSION 4 87 #define NTB_RX_MAX_PKTS 64 88 #define NTB_RXQ_SIZE 300 89 90 enum ntb_link_event { 91 NTB_LINK_DOWN = 0, 92 NTB_LINK_UP, 93 }; 94 95 static SYSCTL_NODE(_hw, OID_AUTO, if_ntb, CTLFLAG_RW, 0, "if_ntb"); 96 97 static unsigned g_if_ntb_debug_level; 98 SYSCTL_UINT(_hw_if_ntb, OID_AUTO, debug_level, CTLFLAG_RWTUN, 99 &g_if_ntb_debug_level, 0, "if_ntb log level -- higher is more verbose"); 100 #define ntb_printf(lvl, ...) do { \ 101 if ((lvl) <= g_if_ntb_debug_level) { \ 102 if_printf(nt->ifp, __VA_ARGS__); \ 103 } \ 104 } while (0) 105 106 static unsigned transport_mtu = IP_MAXPACKET + ETHER_HDR_LEN + ETHER_CRC_LEN; 107 108 static uint64_t max_mw_size; 109 SYSCTL_UQUAD(_hw_if_ntb, OID_AUTO, max_mw_size, CTLFLAG_RDTUN, &max_mw_size, 0, 110 "If enabled (non-zero), limit the size of large memory windows. " 111 "Both sides of the NTB MUST set the same value here."); 112 113 static unsigned max_num_clients; 114 SYSCTL_UINT(_hw_if_ntb, OID_AUTO, max_num_clients, CTLFLAG_RDTUN, 115 &max_num_clients, 0, "Maximum number of NTB transport clients. " 116 "0 (default) - use all available NTB memory windows; " 117 "positive integer N - Limit to N memory windows."); 118 119 static unsigned enable_xeon_watchdog; 120 SYSCTL_UINT(_hw_if_ntb, OID_AUTO, enable_xeon_watchdog, CTLFLAG_RDTUN, 121 &enable_xeon_watchdog, 0, "If non-zero, write a register every second to " 122 "keep a watchdog from tearing down the NTB link"); 123 124 STAILQ_HEAD(ntb_queue_list, ntb_queue_entry); 125 126 typedef uint32_t ntb_q_idx_t; 127 128 struct ntb_queue_entry { 129 /* ntb_queue list reference */ 130 STAILQ_ENTRY(ntb_queue_entry) entry; 131 132 /* info on data to be transferred */ 133 void *cb_data; 134 void *buf; 135 uint32_t len; 136 uint32_t flags; 137 138 struct ntb_transport_qp *qp; 139 struct ntb_payload_header *x_hdr; 140 ntb_q_idx_t index; 141 }; 142 143 struct ntb_rx_info { 144 ntb_q_idx_t entry; 145 }; 146 147 struct ntb_transport_qp { 148 struct ntb_transport_ctx *transport; 149 struct ntb_softc *ntb; 150 151 void *cb_data; 152 153 bool client_ready; 154 volatile bool link_is_up; 155 uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */ 156 157 struct ntb_rx_info *rx_info; 158 struct ntb_rx_info *remote_rx_info; 159 160 void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, 161 void *data, int len); 162 struct ntb_queue_list tx_free_q; 163 struct mtx ntb_tx_free_q_lock; 164 caddr_t tx_mw; 165 bus_addr_t tx_mw_phys; 166 ntb_q_idx_t tx_index; 167 ntb_q_idx_t tx_max_entry; 168 uint64_t tx_max_frame; 169 170 void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, 171 void *data, int len); 172 struct ntb_queue_list rx_post_q; 173 struct ntb_queue_list rx_pend_q; 174 /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */ 175 struct mtx ntb_rx_q_lock; 176 struct task rx_completion_task; 177 struct task rxc_db_work; 178 caddr_t rx_buff; 179 ntb_q_idx_t rx_index; 180 ntb_q_idx_t rx_max_entry; 181 uint64_t rx_max_frame; 182 183 void (*event_handler)(void *data, enum ntb_link_event status); 184 struct callout link_work; 185 struct callout queue_full; 186 struct callout rx_full; 187 188 uint64_t last_rx_no_buf; 189 190 /* Stats */ 191 uint64_t rx_bytes; 192 uint64_t rx_pkts; 193 uint64_t rx_ring_empty; 194 uint64_t rx_err_no_buf; 195 uint64_t rx_err_oflow; 196 uint64_t rx_err_ver; 197 uint64_t tx_bytes; 198 uint64_t tx_pkts; 199 uint64_t tx_ring_full; 200 uint64_t tx_err_no_buf; 201 }; 202 203 struct ntb_queue_handlers { 204 void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, 205 void *data, int len); 206 void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, 207 void *data, int len); 208 void (*event_handler)(void *data, enum ntb_link_event status); 209 }; 210 211 struct ntb_transport_mw { 212 vm_paddr_t phys_addr; 213 size_t phys_size; 214 size_t xlat_align; 215 size_t xlat_align_size; 216 bus_addr_t addr_limit; 217 /* Tx buff is off vbase / phys_addr */ 218 caddr_t vbase; 219 size_t xlat_size; 220 size_t buff_size; 221 /* Rx buff is off virt_addr / dma_addr */ 222 caddr_t virt_addr; 223 bus_addr_t dma_addr; 224 }; 225 226 struct ntb_transport_ctx { 227 struct ntb_softc *ntb; 228 struct ifnet *ifp; 229 struct ntb_transport_mw mw_vec[NTB_MAX_NUM_MW]; 230 struct ntb_transport_qp *qp_vec; 231 struct _qpset qp_bitmap; 232 struct _qpset qp_bitmap_free; 233 unsigned mw_count; 234 unsigned qp_count; 235 volatile bool link_is_up; 236 struct callout link_work; 237 struct callout link_watchdog; 238 struct task link_cleanup; 239 uint64_t bufsize; 240 u_char eaddr[ETHER_ADDR_LEN]; 241 struct mtx tx_lock; 242 struct mtx rx_lock; 243 244 /* The hardcoded single queuepair in ntb_setup_interface() */ 245 struct ntb_transport_qp *qp; 246 }; 247 248 static struct ntb_transport_ctx net_softc; 249 250 enum { 251 IF_NTB_DESC_DONE_FLAG = 1 << 0, 252 IF_NTB_LINK_DOWN_FLAG = 1 << 1, 253 }; 254 255 struct ntb_payload_header { 256 ntb_q_idx_t ver; 257 uint32_t len; 258 uint32_t flags; 259 }; 260 261 enum { 262 /* 263 * The order of this enum is part of the if_ntb remote protocol. Do 264 * not reorder without bumping protocol version (and it's probably best 265 * to keep the protocol in lock-step with the Linux NTB driver. 266 */ 267 IF_NTB_VERSION = 0, 268 IF_NTB_QP_LINKS, 269 IF_NTB_NUM_QPS, 270 IF_NTB_NUM_MWS, 271 /* 272 * N.B.: transport_link_work assumes MW1 enums = MW0 + 2. 273 */ 274 IF_NTB_MW0_SZ_HIGH, 275 IF_NTB_MW0_SZ_LOW, 276 IF_NTB_MW1_SZ_HIGH, 277 IF_NTB_MW1_SZ_LOW, 278 IF_NTB_MAX_SPAD, 279 280 /* 281 * Some NTB-using hardware have a watchdog to work around NTB hangs; if 282 * a register or doorbell isn't written every few seconds, the link is 283 * torn down. Write an otherwise unused register every few seconds to 284 * work around this watchdog. 285 */ 286 IF_NTB_WATCHDOG_SPAD = 15 287 }; 288 CTASSERT(IF_NTB_WATCHDOG_SPAD < XEON_SPAD_COUNT && 289 IF_NTB_WATCHDOG_SPAD < ATOM_SPAD_COUNT); 290 291 #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) 292 #define NTB_QP_DEF_NUM_ENTRIES 100 293 #define NTB_LINK_DOWN_TIMEOUT 10 294 295 static int ntb_handle_module_events(struct module *m, int what, void *arg); 296 static int ntb_setup_interface(void); 297 static int ntb_teardown_interface(void); 298 static void ntb_net_init(void *arg); 299 static int ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data); 300 static void ntb_start(struct ifnet *ifp); 301 static void ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, 302 void *data, int len); 303 static void ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, 304 void *data, int len); 305 static void ntb_net_event_handler(void *data, enum ntb_link_event status); 306 static int ntb_transport_probe(struct ntb_softc *ntb); 307 static void ntb_transport_free(struct ntb_transport_ctx *); 308 static void ntb_transport_init_queue(struct ntb_transport_ctx *nt, 309 unsigned int qp_num); 310 static void ntb_transport_free_queue(struct ntb_transport_qp *qp); 311 static struct ntb_transport_qp *ntb_transport_create_queue(void *data, 312 struct ntb_softc *pdev, const struct ntb_queue_handlers *handlers); 313 static void ntb_transport_link_up(struct ntb_transport_qp *qp); 314 static int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, 315 void *data, unsigned int len); 316 static int ntb_process_tx(struct ntb_transport_qp *qp, 317 struct ntb_queue_entry *entry); 318 static void ntb_memcpy_tx(struct ntb_transport_qp *qp, 319 struct ntb_queue_entry *entry, void *offset); 320 static void ntb_qp_full(void *arg); 321 static void ntb_transport_rxc_db(void *arg, int pending); 322 static int ntb_process_rxc(struct ntb_transport_qp *qp); 323 static void ntb_memcpy_rx(struct ntb_transport_qp *qp, 324 struct ntb_queue_entry *entry, void *offset); 325 static inline void ntb_rx_copy_callback(struct ntb_transport_qp *qp, 326 void *data); 327 static void ntb_complete_rxc(void *arg, int pending); 328 static void ntb_transport_doorbell_callback(void *data, uint32_t vector); 329 static void ntb_transport_event_callback(void *data); 330 static void ntb_transport_link_work(void *arg); 331 static int ntb_set_mw(struct ntb_transport_ctx *, int num_mw, size_t size); 332 static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw); 333 static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, 334 unsigned int qp_num); 335 static void ntb_qp_link_work(void *arg); 336 static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt); 337 static void ntb_transport_link_cleanup_work(void *, int); 338 static void ntb_qp_link_down(struct ntb_transport_qp *qp); 339 static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp); 340 static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp); 341 static void ntb_transport_link_down(struct ntb_transport_qp *qp); 342 static void ntb_send_link_down(struct ntb_transport_qp *qp); 343 static void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 344 struct ntb_queue_list *list); 345 static struct ntb_queue_entry *ntb_list_rm(struct mtx *lock, 346 struct ntb_queue_list *list); 347 static struct ntb_queue_entry *ntb_list_mv(struct mtx *lock, 348 struct ntb_queue_list *from, struct ntb_queue_list *to); 349 static void create_random_local_eui48(u_char *eaddr); 350 static unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp); 351 static void xeon_link_watchdog_hb(void *); 352 353 static const struct ntb_ctx_ops ntb_transport_ops = { 354 .link_event = ntb_transport_event_callback, 355 .db_event = ntb_transport_doorbell_callback, 356 }; 357 358 MALLOC_DEFINE(M_NTB_IF, "if_ntb", "ntb network driver"); 359 360 static inline void 361 iowrite32(uint32_t val, void *addr) 362 { 363 364 bus_space_write_4(X86_BUS_SPACE_MEM, 0/* HACK */, (uintptr_t)addr, 365 val); 366 } 367 368 /* Module setup and teardown */ 369 static int 370 ntb_handle_module_events(struct module *m, int what, void *arg) 371 { 372 int err = 0; 373 374 switch (what) { 375 case MOD_LOAD: 376 err = ntb_setup_interface(); 377 break; 378 case MOD_UNLOAD: 379 err = ntb_teardown_interface(); 380 break; 381 default: 382 err = EOPNOTSUPP; 383 break; 384 } 385 return (err); 386 } 387 388 static moduledata_t if_ntb_mod = { 389 "if_ntb", 390 ntb_handle_module_events, 391 NULL 392 }; 393 394 DECLARE_MODULE(if_ntb, if_ntb_mod, SI_SUB_KLD, SI_ORDER_ANY); 395 MODULE_DEPEND(if_ntb, ntb_hw, 1, 1, 1); 396 397 static int 398 ntb_setup_interface(void) 399 { 400 struct ifnet *ifp; 401 struct ntb_queue_handlers handlers = { ntb_net_rx_handler, 402 ntb_net_tx_handler, ntb_net_event_handler }; 403 int rc; 404 405 net_softc.ntb = devclass_get_softc(devclass_find("ntb_hw"), 0); 406 if (net_softc.ntb == NULL) { 407 printf("ntb: Cannot find devclass\n"); 408 return (ENXIO); 409 } 410 411 ifp = net_softc.ifp = if_alloc(IFT_ETHER); 412 if (ifp == NULL) { 413 ntb_transport_free(&net_softc); 414 printf("ntb: Cannot allocate ifnet structure\n"); 415 return (ENOMEM); 416 } 417 if_initname(ifp, "ntb", 0); 418 419 rc = ntb_transport_probe(net_softc.ntb); 420 if (rc != 0) { 421 printf("ntb: Cannot init transport: %d\n", rc); 422 if_free(net_softc.ifp); 423 return (rc); 424 } 425 426 net_softc.qp = ntb_transport_create_queue(ifp, net_softc.ntb, 427 &handlers); 428 ifp->if_init = ntb_net_init; 429 ifp->if_softc = &net_softc; 430 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 431 ifp->if_ioctl = ntb_ioctl; 432 ifp->if_start = ntb_start; 433 IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 434 ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 435 IFQ_SET_READY(&ifp->if_snd); 436 create_random_local_eui48(net_softc.eaddr); 437 ether_ifattach(ifp, net_softc.eaddr); 438 ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_JUMBO_MTU; 439 ifp->if_capenable = ifp->if_capabilities; 440 ifp->if_mtu = ntb_transport_max_size(net_softc.qp) - ETHER_HDR_LEN - 441 ETHER_CRC_LEN; 442 443 ntb_transport_link_up(net_softc.qp); 444 net_softc.bufsize = ntb_transport_max_size(net_softc.qp) + 445 sizeof(struct ether_header); 446 return (0); 447 } 448 449 static int 450 ntb_teardown_interface(void) 451 { 452 453 if (net_softc.qp != NULL) { 454 ntb_transport_link_down(net_softc.qp); 455 456 ntb_transport_free_queue(net_softc.qp); 457 ntb_transport_free(&net_softc); 458 } 459 460 if (net_softc.ifp != NULL) { 461 ether_ifdetach(net_softc.ifp); 462 if_free(net_softc.ifp); 463 net_softc.ifp = NULL; 464 } 465 466 return (0); 467 } 468 469 /* Network device interface */ 470 471 static void 472 ntb_net_init(void *arg) 473 { 474 struct ntb_transport_ctx *ntb_softc = arg; 475 struct ifnet *ifp = ntb_softc->ifp; 476 477 ifp->if_drv_flags |= IFF_DRV_RUNNING; 478 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 479 ifp->if_flags |= IFF_UP; 480 if_link_state_change(ifp, LINK_STATE_UP); 481 } 482 483 static int 484 ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 485 { 486 struct ntb_transport_ctx *nt = ifp->if_softc; 487 struct ifreq *ifr = (struct ifreq *)data; 488 int error = 0; 489 490 switch (command) { 491 case SIOCSIFMTU: 492 { 493 if (ifr->ifr_mtu > ntb_transport_max_size(nt->qp) - 494 ETHER_HDR_LEN - ETHER_CRC_LEN) { 495 error = EINVAL; 496 break; 497 } 498 499 ifp->if_mtu = ifr->ifr_mtu; 500 break; 501 } 502 default: 503 error = ether_ioctl(ifp, command, data); 504 break; 505 } 506 507 return (error); 508 } 509 510 511 static void 512 ntb_start(struct ifnet *ifp) 513 { 514 struct mbuf *m_head; 515 struct ntb_transport_ctx *nt = ifp->if_softc; 516 int rc; 517 518 mtx_lock(&nt->tx_lock); 519 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 520 CTR0(KTR_NTB, "TX: ntb_start"); 521 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 522 IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head); 523 CTR1(KTR_NTB, "TX: start mbuf %p", m_head); 524 rc = ntb_transport_tx_enqueue(nt->qp, m_head, m_head, 525 m_length(m_head, NULL)); 526 if (rc != 0) { 527 CTR1(KTR_NTB, 528 "TX: could not tx mbuf %p. Returning to snd q", 529 m_head); 530 if (rc == EAGAIN) { 531 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 532 IFQ_DRV_PREPEND(&ifp->if_snd, m_head); 533 callout_reset(&nt->qp->queue_full, hz / 1000, 534 ntb_qp_full, ifp); 535 } 536 break; 537 } 538 539 } 540 mtx_unlock(&nt->tx_lock); 541 } 542 543 /* Network Device Callbacks */ 544 static void 545 ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 546 int len) 547 { 548 549 m_freem(data); 550 CTR1(KTR_NTB, "TX: tx_handler freeing mbuf %p", data); 551 } 552 553 static void 554 ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 555 int len) 556 { 557 struct mbuf *m = data; 558 struct ifnet *ifp = qp_data; 559 560 CTR0(KTR_NTB, "RX: rx handler"); 561 (*ifp->if_input)(ifp, m); 562 } 563 564 static void 565 ntb_net_event_handler(void *data, enum ntb_link_event status) 566 { 567 struct ifnet *ifp; 568 569 ifp = data; 570 (void)ifp; 571 572 /* XXX The Linux driver munges with the carrier status here. */ 573 574 switch (status) { 575 case NTB_LINK_DOWN: 576 break; 577 case NTB_LINK_UP: 578 break; 579 default: 580 panic("Bogus ntb_link_event %u\n", status); 581 } 582 } 583 584 /* Transport Init and teardown */ 585 586 static void 587 xeon_link_watchdog_hb(void *arg) 588 { 589 struct ntb_transport_ctx *nt; 590 591 nt = arg; 592 ntb_spad_write(nt->ntb, IF_NTB_WATCHDOG_SPAD, 0); 593 callout_reset(&nt->link_watchdog, 1 * hz, xeon_link_watchdog_hb, nt); 594 } 595 596 static int 597 ntb_transport_probe(struct ntb_softc *ntb) 598 { 599 struct ntb_transport_ctx *nt = &net_softc; 600 struct ntb_transport_mw *mw; 601 uint64_t qp_bitmap; 602 int rc; 603 unsigned i; 604 605 nt->mw_count = ntb_mw_count(ntb); 606 for (i = 0; i < nt->mw_count; i++) { 607 mw = &nt->mw_vec[i]; 608 609 rc = ntb_mw_get_range(ntb, i, &mw->phys_addr, &mw->vbase, 610 &mw->phys_size, &mw->xlat_align, &mw->xlat_align_size, 611 &mw->addr_limit); 612 if (rc != 0) 613 goto err; 614 615 mw->buff_size = 0; 616 mw->xlat_size = 0; 617 mw->virt_addr = NULL; 618 mw->dma_addr = 0; 619 } 620 621 qp_bitmap = ntb_db_valid_mask(ntb); 622 nt->qp_count = flsll(qp_bitmap); 623 KASSERT(nt->qp_count != 0, ("bogus db bitmap")); 624 nt->qp_count -= 1; 625 626 if (max_num_clients != 0 && max_num_clients < nt->qp_count) 627 nt->qp_count = max_num_clients; 628 else if (nt->mw_count < nt->qp_count) 629 nt->qp_count = nt->mw_count; 630 KASSERT(nt->qp_count <= QP_SETSIZE, ("invalid qp_count")); 631 632 mtx_init(&nt->tx_lock, "ntb transport tx", NULL, MTX_DEF); 633 mtx_init(&nt->rx_lock, "ntb transport rx", NULL, MTX_DEF); 634 635 nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_IF, 636 M_WAITOK | M_ZERO); 637 638 for (i = 0; i < nt->qp_count; i++) { 639 set_bit(i, &nt->qp_bitmap); 640 set_bit(i, &nt->qp_bitmap_free); 641 ntb_transport_init_queue(nt, i); 642 } 643 644 callout_init(&nt->link_work, 0); 645 callout_init(&nt->link_watchdog, 0); 646 TASK_INIT(&nt->link_cleanup, 0, ntb_transport_link_cleanup_work, nt); 647 648 rc = ntb_set_ctx(ntb, nt, &ntb_transport_ops); 649 if (rc != 0) 650 goto err; 651 652 nt->link_is_up = false; 653 ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); 654 ntb_link_event(ntb); 655 656 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 657 if (enable_xeon_watchdog != 0) 658 callout_reset(&nt->link_watchdog, 0, xeon_link_watchdog_hb, nt); 659 return (0); 660 661 err: 662 free(nt->qp_vec, M_NTB_IF); 663 nt->qp_vec = NULL; 664 return (rc); 665 } 666 667 static void 668 ntb_transport_free(struct ntb_transport_ctx *nt) 669 { 670 struct ntb_softc *ntb = nt->ntb; 671 struct _qpset qp_bitmap_alloc; 672 uint8_t i; 673 674 ntb_transport_link_cleanup(nt); 675 taskqueue_drain(taskqueue_swi, &nt->link_cleanup); 676 callout_drain(&nt->link_work); 677 callout_drain(&nt->link_watchdog); 678 679 BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &qp_bitmap_alloc); 680 BIT_NAND(QP_SETSIZE, &qp_bitmap_alloc, &nt->qp_bitmap_free); 681 682 /* Verify that all the QPs are freed */ 683 for (i = 0; i < nt->qp_count; i++) 684 if (test_bit(i, &qp_bitmap_alloc)) 685 ntb_transport_free_queue(&nt->qp_vec[i]); 686 687 ntb_link_disable(ntb); 688 ntb_clear_ctx(ntb); 689 690 for (i = 0; i < nt->mw_count; i++) 691 ntb_free_mw(nt, i); 692 693 free(nt->qp_vec, M_NTB_IF); 694 } 695 696 static void 697 ntb_transport_init_queue(struct ntb_transport_ctx *nt, unsigned int qp_num) 698 { 699 struct ntb_transport_mw *mw; 700 struct ntb_transport_qp *qp; 701 vm_paddr_t mw_base; 702 uint64_t mw_size, qp_offset; 703 size_t tx_size; 704 unsigned num_qps_mw, mw_num, mw_count; 705 706 mw_count = nt->mw_count; 707 mw_num = QP_TO_MW(nt, qp_num); 708 mw = &nt->mw_vec[mw_num]; 709 710 qp = &nt->qp_vec[qp_num]; 711 qp->qp_num = qp_num; 712 qp->transport = nt; 713 qp->ntb = nt->ntb; 714 qp->client_ready = false; 715 qp->event_handler = NULL; 716 ntb_qp_link_down_reset(qp); 717 718 if (nt->qp_count % mw_count && mw_num + 1 < nt->qp_count / mw_count) 719 num_qps_mw = nt->qp_count / mw_count + 1; 720 else 721 num_qps_mw = nt->qp_count / mw_count; 722 723 mw_base = mw->phys_addr; 724 mw_size = mw->phys_size; 725 726 tx_size = mw_size / num_qps_mw; 727 qp_offset = tx_size * (qp_num / mw_count); 728 729 qp->tx_mw = mw->vbase + qp_offset; 730 KASSERT(qp->tx_mw != NULL, ("uh oh?")); 731 732 /* XXX Assumes that a vm_paddr_t is equivalent to bus_addr_t */ 733 qp->tx_mw_phys = mw_base + qp_offset; 734 KASSERT(qp->tx_mw_phys != 0, ("uh oh?")); 735 736 tx_size -= sizeof(struct ntb_rx_info); 737 qp->rx_info = (void *)(qp->tx_mw + tx_size); 738 739 /* Due to house-keeping, there must be at least 2 buffs */ 740 qp->tx_max_frame = qmin(tx_size / 2, 741 transport_mtu + sizeof(struct ntb_payload_header)); 742 qp->tx_max_entry = tx_size / qp->tx_max_frame; 743 744 callout_init(&qp->link_work, 0); 745 callout_init(&qp->queue_full, 1); 746 callout_init(&qp->rx_full, 1); 747 748 mtx_init(&qp->ntb_rx_q_lock, "ntb rx q", NULL, MTX_SPIN); 749 mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN); 750 TASK_INIT(&qp->rx_completion_task, 0, ntb_complete_rxc, qp); 751 TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp); 752 753 STAILQ_INIT(&qp->rx_post_q); 754 STAILQ_INIT(&qp->rx_pend_q); 755 STAILQ_INIT(&qp->tx_free_q); 756 757 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 758 } 759 760 static void 761 ntb_transport_free_queue(struct ntb_transport_qp *qp) 762 { 763 struct ntb_queue_entry *entry; 764 765 if (qp == NULL) 766 return; 767 768 callout_drain(&qp->link_work); 769 770 ntb_db_set_mask(qp->ntb, 1ull << qp->qp_num); 771 taskqueue_drain(taskqueue_swi, &qp->rxc_db_work); 772 taskqueue_drain(taskqueue_swi, &qp->rx_completion_task); 773 774 qp->cb_data = NULL; 775 qp->rx_handler = NULL; 776 qp->tx_handler = NULL; 777 qp->event_handler = NULL; 778 779 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) 780 free(entry, M_NTB_IF); 781 782 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) 783 free(entry, M_NTB_IF); 784 785 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 786 free(entry, M_NTB_IF); 787 788 set_bit(qp->qp_num, &qp->transport->qp_bitmap_free); 789 } 790 791 /** 792 * ntb_transport_create_queue - Create a new NTB transport layer queue 793 * @rx_handler: receive callback function 794 * @tx_handler: transmit callback function 795 * @event_handler: event callback function 796 * 797 * Create a new NTB transport layer queue and provide the queue with a callback 798 * routine for both transmit and receive. The receive callback routine will be 799 * used to pass up data when the transport has received it on the queue. The 800 * transmit callback routine will be called when the transport has completed the 801 * transmission of the data on the queue and the data is ready to be freed. 802 * 803 * RETURNS: pointer to newly created ntb_queue, NULL on error. 804 */ 805 static struct ntb_transport_qp * 806 ntb_transport_create_queue(void *data, struct ntb_softc *ntb, 807 const struct ntb_queue_handlers *handlers) 808 { 809 struct ntb_queue_entry *entry; 810 struct ntb_transport_qp *qp; 811 struct ntb_transport_ctx *nt; 812 unsigned int free_queue; 813 int i; 814 815 nt = ntb_get_ctx(ntb, NULL); 816 KASSERT(nt != NULL, ("bogus")); 817 818 free_queue = ffs_bit(&nt->qp_bitmap); 819 if (free_queue == 0) 820 return (NULL); 821 822 /* decrement free_queue to make it zero based */ 823 free_queue--; 824 825 qp = &nt->qp_vec[free_queue]; 826 clear_bit(qp->qp_num, &nt->qp_bitmap_free); 827 qp->cb_data = data; 828 qp->rx_handler = handlers->rx_handler; 829 qp->tx_handler = handlers->tx_handler; 830 qp->event_handler = handlers->event_handler; 831 832 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 833 entry = malloc(sizeof(*entry), M_NTB_IF, M_WAITOK | M_ZERO); 834 entry->cb_data = nt->ifp; 835 entry->buf = NULL; 836 entry->len = transport_mtu; 837 ntb_list_add(&qp->ntb_rx_q_lock, entry, &qp->rx_pend_q); 838 } 839 840 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 841 entry = malloc(sizeof(*entry), M_NTB_IF, M_WAITOK | M_ZERO); 842 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 843 } 844 845 ntb_db_clear(ntb, 1ull << qp->qp_num); 846 ntb_db_clear_mask(ntb, 1ull << qp->qp_num); 847 return (qp); 848 } 849 850 /** 851 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue 852 * @qp: NTB transport layer queue to be enabled 853 * 854 * Notify NTB transport layer of client readiness to use queue 855 */ 856 static void 857 ntb_transport_link_up(struct ntb_transport_qp *qp) 858 { 859 struct ntb_transport_ctx *nt; 860 861 if (qp == NULL) 862 return; 863 864 qp->client_ready = true; 865 866 nt = qp->transport; 867 ntb_printf(2, "qp client ready\n"); 868 869 if (qp->transport->link_is_up) 870 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 871 } 872 873 874 875 /* Transport Tx */ 876 877 /** 878 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry 879 * @qp: NTB transport layer queue the entry is to be enqueued on 880 * @cb: per buffer pointer for callback function to use 881 * @data: pointer to data buffer that will be sent 882 * @len: length of the data buffer 883 * 884 * Enqueue a new transmit buffer onto the transport queue from which a NTB 885 * payload will be transmitted. This assumes that a lock is being held to 886 * serialize access to the qp. 887 * 888 * RETURNS: An appropriate ERRNO error value on error, or zero for success. 889 */ 890 static int 891 ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, 892 unsigned int len) 893 { 894 struct ntb_queue_entry *entry; 895 int rc; 896 897 if (qp == NULL || !qp->link_is_up || len == 0) { 898 CTR0(KTR_NTB, "TX: link not up"); 899 return (EINVAL); 900 } 901 902 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 903 if (entry == NULL) { 904 CTR0(KTR_NTB, "TX: could not get entry from tx_free_q"); 905 qp->tx_err_no_buf++; 906 return (EBUSY); 907 } 908 CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry); 909 910 entry->cb_data = cb; 911 entry->buf = data; 912 entry->len = len; 913 entry->flags = 0; 914 915 rc = ntb_process_tx(qp, entry); 916 if (rc != 0) { 917 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 918 CTR1(KTR_NTB, 919 "TX: process_tx failed. Returning entry %p to tx_free_q", 920 entry); 921 } 922 return (rc); 923 } 924 925 static int 926 ntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry) 927 { 928 void *offset; 929 930 offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; 931 CTR3(KTR_NTB, 932 "TX: process_tx: tx_pkts=%lu, tx_index=%u, remote entry=%u", 933 qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry); 934 if (qp->tx_index == qp->remote_rx_info->entry) { 935 CTR0(KTR_NTB, "TX: ring full"); 936 qp->tx_ring_full++; 937 return (EAGAIN); 938 } 939 940 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { 941 if (qp->tx_handler != NULL) 942 qp->tx_handler(qp, qp->cb_data, entry->buf, 943 EIO); 944 else 945 m_freem(entry->buf); 946 947 entry->buf = NULL; 948 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 949 CTR1(KTR_NTB, 950 "TX: frame too big. returning entry %p to tx_free_q", 951 entry); 952 return (0); 953 } 954 CTR2(KTR_NTB, "TX: copying entry %p to offset %p", entry, offset); 955 ntb_memcpy_tx(qp, entry, offset); 956 957 qp->tx_index++; 958 qp->tx_index %= qp->tx_max_entry; 959 960 qp->tx_pkts++; 961 962 return (0); 963 } 964 965 static void 966 ntb_memcpy_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 967 void *offset) 968 { 969 struct ntb_payload_header *hdr; 970 971 /* This piece is from Linux' ntb_async_tx() */ 972 hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame - 973 sizeof(struct ntb_payload_header)); 974 entry->x_hdr = hdr; 975 iowrite32(entry->len, &hdr->len); 976 iowrite32(qp->tx_pkts, &hdr->ver); 977 978 /* This piece is ntb_memcpy_tx() */ 979 CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset); 980 if (entry->buf != NULL) { 981 m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset); 982 983 /* 984 * Ensure that the data is fully copied before setting the 985 * flags 986 */ 987 wmb(); 988 } 989 990 /* The rest is ntb_tx_copy_callback() */ 991 iowrite32(entry->flags | IF_NTB_DESC_DONE_FLAG, &hdr->flags); 992 CTR1(KTR_NTB, "TX: hdr %p set DESC_DONE", hdr); 993 994 ntb_peer_db_set(qp->ntb, 1ull << qp->qp_num); 995 996 /* 997 * The entry length can only be zero if the packet is intended to be a 998 * "link down" or similar. Since no payload is being sent in these 999 * cases, there is nothing to add to the completion queue. 1000 */ 1001 if (entry->len > 0) { 1002 qp->tx_bytes += entry->len; 1003 1004 if (qp->tx_handler) 1005 qp->tx_handler(qp, qp->cb_data, entry->buf, 1006 entry->len); 1007 else 1008 m_freem(entry->buf); 1009 entry->buf = NULL; 1010 } 1011 1012 CTR3(KTR_NTB, 1013 "TX: entry %p sent. hdr->ver = %u, hdr->flags = 0x%x, Returning " 1014 "to tx_free_q", entry, hdr->ver, hdr->flags); 1015 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 1016 } 1017 1018 static void 1019 ntb_qp_full(void *arg) 1020 { 1021 1022 CTR0(KTR_NTB, "TX: qp_full callout"); 1023 ntb_start(arg); 1024 } 1025 1026 /* Transport Rx */ 1027 static void 1028 ntb_transport_rxc_db(void *arg, int pending __unused) 1029 { 1030 struct ntb_transport_qp *qp = arg; 1031 ntb_q_idx_t i; 1032 int rc; 1033 1034 /* 1035 * Limit the number of packets processed in a single interrupt to 1036 * provide fairness to others 1037 */ 1038 CTR0(KTR_NTB, "RX: transport_rx"); 1039 mtx_lock(&qp->transport->rx_lock); 1040 for (i = 0; i < qp->rx_max_entry; i++) { 1041 rc = ntb_process_rxc(qp); 1042 if (rc != 0) { 1043 CTR0(KTR_NTB, "RX: process_rxc failed"); 1044 break; 1045 } 1046 } 1047 mtx_unlock(&qp->transport->rx_lock); 1048 1049 if (i == qp->rx_max_entry) 1050 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1051 else if ((ntb_db_read(qp->ntb) & (1ull << qp->qp_num)) != 0) { 1052 /* If db is set, clear it and read it back to commit clear. */ 1053 ntb_db_clear(qp->ntb, 1ull << qp->qp_num); 1054 (void)ntb_db_read(qp->ntb); 1055 1056 /* 1057 * An interrupt may have arrived between finishing 1058 * ntb_process_rxc and clearing the doorbell bit: there might 1059 * be some more work to do. 1060 */ 1061 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1062 } 1063 } 1064 1065 static int 1066 ntb_process_rxc(struct ntb_transport_qp *qp) 1067 { 1068 struct ntb_payload_header *hdr; 1069 struct ntb_queue_entry *entry; 1070 caddr_t offset; 1071 1072 offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; 1073 hdr = (void *)(offset + qp->rx_max_frame - 1074 sizeof(struct ntb_payload_header)); 1075 1076 CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index); 1077 if ((hdr->flags & IF_NTB_DESC_DONE_FLAG) == 0) { 1078 CTR0(KTR_NTB, "RX: hdr not done"); 1079 qp->rx_ring_empty++; 1080 return (EAGAIN); 1081 } 1082 1083 if ((hdr->flags & IF_NTB_LINK_DOWN_FLAG) != 0) { 1084 CTR0(KTR_NTB, "RX: link down"); 1085 ntb_qp_link_down(qp); 1086 hdr->flags = 0; 1087 return (EAGAIN); 1088 } 1089 1090 if (hdr->ver != (uint32_t)qp->rx_pkts) { 1091 CTR2(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). " 1092 "Returning entry to rx_pend_q", hdr->ver, qp->rx_pkts); 1093 qp->rx_err_ver++; 1094 return (EIO); 1095 } 1096 1097 entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); 1098 if (entry == NULL) { 1099 qp->rx_err_no_buf++; 1100 CTR0(KTR_NTB, "RX: No entries in rx_pend_q"); 1101 return (EAGAIN); 1102 } 1103 callout_stop(&qp->rx_full); 1104 CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry); 1105 1106 entry->x_hdr = hdr; 1107 entry->index = qp->rx_index; 1108 1109 if (hdr->len > entry->len) { 1110 CTR2(KTR_NTB, "RX: len too long. Wanted %ju got %ju", 1111 (uintmax_t)hdr->len, (uintmax_t)entry->len); 1112 qp->rx_err_oflow++; 1113 1114 entry->len = -EIO; 1115 entry->flags |= IF_NTB_DESC_DONE_FLAG; 1116 1117 taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 1118 } else { 1119 qp->rx_bytes += hdr->len; 1120 qp->rx_pkts++; 1121 1122 CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts); 1123 1124 entry->len = hdr->len; 1125 1126 ntb_memcpy_rx(qp, entry, offset); 1127 } 1128 1129 qp->rx_index++; 1130 qp->rx_index %= qp->rx_max_entry; 1131 return (0); 1132 } 1133 1134 static void 1135 ntb_memcpy_rx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 1136 void *offset) 1137 { 1138 struct ifnet *ifp = entry->cb_data; 1139 unsigned int len = entry->len; 1140 struct mbuf *m; 1141 1142 CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset); 1143 m = m_devget(offset, len, 0, ifp, NULL); 1144 m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID; 1145 1146 entry->buf = (void *)m; 1147 1148 /* Ensure that the data is globally visible before clearing the flag */ 1149 wmb(); 1150 1151 CTR2(KTR_NTB, "RX: copied entry %p to mbuf %p.", entry, m); 1152 ntb_rx_copy_callback(qp, entry); 1153 } 1154 1155 static inline void 1156 ntb_rx_copy_callback(struct ntb_transport_qp *qp, void *data) 1157 { 1158 struct ntb_queue_entry *entry; 1159 1160 entry = data; 1161 entry->flags |= IF_NTB_DESC_DONE_FLAG; 1162 taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 1163 } 1164 1165 static void 1166 ntb_complete_rxc(void *arg, int pending) 1167 { 1168 struct ntb_transport_qp *qp = arg; 1169 struct ntb_queue_entry *entry; 1170 struct mbuf *m; 1171 unsigned len; 1172 1173 CTR0(KTR_NTB, "RX: rx_completion_task"); 1174 1175 mtx_lock_spin(&qp->ntb_rx_q_lock); 1176 1177 while (!STAILQ_EMPTY(&qp->rx_post_q)) { 1178 entry = STAILQ_FIRST(&qp->rx_post_q); 1179 if ((entry->flags & IF_NTB_DESC_DONE_FLAG) == 0) 1180 break; 1181 1182 entry->x_hdr->flags = 0; 1183 iowrite32(entry->index, &qp->rx_info->entry); 1184 1185 STAILQ_REMOVE_HEAD(&qp->rx_post_q, entry); 1186 1187 len = entry->len; 1188 m = entry->buf; 1189 1190 /* 1191 * Re-initialize queue_entry for reuse; rx_handler takes 1192 * ownership of the mbuf. 1193 */ 1194 entry->buf = NULL; 1195 entry->len = transport_mtu; 1196 entry->cb_data = qp->transport->ifp; 1197 1198 STAILQ_INSERT_TAIL(&qp->rx_pend_q, entry, entry); 1199 1200 mtx_unlock_spin(&qp->ntb_rx_q_lock); 1201 1202 CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m); 1203 if (qp->rx_handler != NULL && qp->client_ready) 1204 qp->rx_handler(qp, qp->cb_data, m, len); 1205 else 1206 m_freem(m); 1207 1208 mtx_lock_spin(&qp->ntb_rx_q_lock); 1209 } 1210 1211 mtx_unlock_spin(&qp->ntb_rx_q_lock); 1212 } 1213 1214 static void 1215 ntb_transport_doorbell_callback(void *data, uint32_t vector) 1216 { 1217 struct ntb_transport_ctx *nt = data; 1218 struct ntb_transport_qp *qp; 1219 struct _qpset db_bits; 1220 uint64_t vec_mask; 1221 unsigned qp_num; 1222 1223 BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &db_bits); 1224 BIT_NAND(QP_SETSIZE, &db_bits, &nt->qp_bitmap_free); 1225 1226 vec_mask = ntb_db_vector_mask(nt->ntb, vector); 1227 while (vec_mask != 0) { 1228 qp_num = ffsll(vec_mask) - 1; 1229 1230 if (test_bit(qp_num, &db_bits)) { 1231 qp = &nt->qp_vec[qp_num]; 1232 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1233 } 1234 1235 vec_mask &= ~(1ull << qp_num); 1236 } 1237 } 1238 1239 /* Link Event handler */ 1240 static void 1241 ntb_transport_event_callback(void *data) 1242 { 1243 struct ntb_transport_ctx *nt = data; 1244 1245 if (ntb_link_is_up(nt->ntb, NULL, NULL)) { 1246 ntb_printf(1, "HW link up\n"); 1247 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 1248 } else { 1249 ntb_printf(1, "HW link down\n"); 1250 taskqueue_enqueue(taskqueue_swi, &nt->link_cleanup); 1251 } 1252 } 1253 1254 /* Link bring up */ 1255 static void 1256 ntb_transport_link_work(void *arg) 1257 { 1258 struct ntb_transport_ctx *nt = arg; 1259 struct ntb_softc *ntb = nt->ntb; 1260 struct ntb_transport_qp *qp; 1261 uint64_t val64, size; 1262 uint32_t val; 1263 unsigned i; 1264 int rc; 1265 1266 /* send the local info, in the opposite order of the way we read it */ 1267 for (i = 0; i < nt->mw_count; i++) { 1268 size = nt->mw_vec[i].phys_size; 1269 1270 if (max_mw_size != 0 && size > max_mw_size) 1271 size = max_mw_size; 1272 1273 ntb_peer_spad_write(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1274 size >> 32); 1275 ntb_peer_spad_write(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), size); 1276 } 1277 1278 ntb_peer_spad_write(ntb, IF_NTB_NUM_MWS, nt->mw_count); 1279 1280 ntb_peer_spad_write(ntb, IF_NTB_NUM_QPS, nt->qp_count); 1281 1282 ntb_peer_spad_write(ntb, IF_NTB_VERSION, NTB_TRANSPORT_VERSION); 1283 1284 /* Query the remote side for its info */ 1285 val = 0; 1286 ntb_spad_read(ntb, IF_NTB_VERSION, &val); 1287 if (val != NTB_TRANSPORT_VERSION) 1288 goto out; 1289 1290 ntb_spad_read(ntb, IF_NTB_NUM_QPS, &val); 1291 if (val != nt->qp_count) 1292 goto out; 1293 1294 ntb_spad_read(ntb, IF_NTB_NUM_MWS, &val); 1295 if (val != nt->mw_count) 1296 goto out; 1297 1298 for (i = 0; i < nt->mw_count; i++) { 1299 ntb_spad_read(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), &val); 1300 val64 = (uint64_t)val << 32; 1301 1302 ntb_spad_read(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), &val); 1303 val64 |= val; 1304 1305 rc = ntb_set_mw(nt, i, val64); 1306 if (rc != 0) 1307 goto free_mws; 1308 } 1309 1310 nt->link_is_up = true; 1311 ntb_printf(1, "transport link up\n"); 1312 1313 for (i = 0; i < nt->qp_count; i++) { 1314 qp = &nt->qp_vec[i]; 1315 1316 ntb_transport_setup_qp_mw(nt, i); 1317 1318 if (qp->client_ready) 1319 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 1320 } 1321 1322 return; 1323 1324 free_mws: 1325 for (i = 0; i < nt->mw_count; i++) 1326 ntb_free_mw(nt, i); 1327 out: 1328 if (ntb_link_is_up(ntb, NULL, NULL)) 1329 callout_reset(&nt->link_work, 1330 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt); 1331 } 1332 1333 static int 1334 ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, size_t size) 1335 { 1336 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; 1337 size_t xlat_size, buff_size; 1338 int rc; 1339 1340 if (size == 0) 1341 return (EINVAL); 1342 1343 xlat_size = roundup(size, mw->xlat_align_size); 1344 buff_size = xlat_size; 1345 1346 /* No need to re-setup */ 1347 if (mw->xlat_size == xlat_size) 1348 return (0); 1349 1350 if (mw->buff_size != 0) 1351 ntb_free_mw(nt, num_mw); 1352 1353 /* Alloc memory for receiving data. Must be aligned */ 1354 mw->xlat_size = xlat_size; 1355 mw->buff_size = buff_size; 1356 1357 mw->virt_addr = contigmalloc(mw->buff_size, M_NTB_IF, M_ZERO, 0, 1358 mw->addr_limit, mw->xlat_align, 0); 1359 if (mw->virt_addr == NULL) { 1360 ntb_printf(0, "Unable to allocate MW buffer of size %zu/%zu\n", 1361 mw->buff_size, mw->xlat_size); 1362 mw->xlat_size = 0; 1363 mw->buff_size = 0; 1364 return (ENOMEM); 1365 } 1366 /* TODO: replace with bus_space_* functions */ 1367 mw->dma_addr = vtophys(mw->virt_addr); 1368 1369 /* 1370 * Ensure that the allocation from contigmalloc is aligned as 1371 * requested. XXX: This may not be needed -- brought in for parity 1372 * with the Linux driver. 1373 */ 1374 if (mw->dma_addr % mw->xlat_align != 0) { 1375 ntb_printf(0, 1376 "DMA memory 0x%jx not aligned to BAR size 0x%zx\n", 1377 (uintmax_t)mw->dma_addr, size); 1378 ntb_free_mw(nt, num_mw); 1379 return (ENOMEM); 1380 } 1381 1382 /* Notify HW the memory location of the receive buffer */ 1383 rc = ntb_mw_set_trans(nt->ntb, num_mw, mw->dma_addr, mw->xlat_size); 1384 if (rc) { 1385 ntb_printf(0, "Unable to set mw%d translation\n", num_mw); 1386 ntb_free_mw(nt, num_mw); 1387 return (rc); 1388 } 1389 1390 return (0); 1391 } 1392 1393 static void 1394 ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) 1395 { 1396 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; 1397 1398 if (mw->virt_addr == NULL) 1399 return; 1400 1401 ntb_mw_clear_trans(nt->ntb, num_mw); 1402 contigfree(mw->virt_addr, mw->xlat_size, M_NTB_IF); 1403 mw->xlat_size = 0; 1404 mw->buff_size = 0; 1405 mw->virt_addr = NULL; 1406 } 1407 1408 static int 1409 ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, unsigned int qp_num) 1410 { 1411 struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; 1412 struct ntb_transport_mw *mw; 1413 void *offset; 1414 ntb_q_idx_t i; 1415 size_t rx_size; 1416 unsigned num_qps_mw, mw_num, mw_count; 1417 1418 mw_count = nt->mw_count; 1419 mw_num = QP_TO_MW(nt, qp_num); 1420 mw = &nt->mw_vec[mw_num]; 1421 1422 if (mw->virt_addr == NULL) 1423 return (ENOMEM); 1424 1425 if (nt->qp_count % mw_count && mw_num + 1 < nt->qp_count / mw_count) 1426 num_qps_mw = nt->qp_count / mw_count + 1; 1427 else 1428 num_qps_mw = nt->qp_count / mw_count; 1429 1430 rx_size = mw->xlat_size / num_qps_mw; 1431 qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); 1432 rx_size -= sizeof(struct ntb_rx_info); 1433 1434 qp->remote_rx_info = (void*)(qp->rx_buff + rx_size); 1435 1436 /* Due to house-keeping, there must be at least 2 buffs */ 1437 qp->rx_max_frame = qmin(rx_size / 2, 1438 transport_mtu + sizeof(struct ntb_payload_header)); 1439 qp->rx_max_entry = rx_size / qp->rx_max_frame; 1440 qp->rx_index = 0; 1441 1442 qp->remote_rx_info->entry = qp->rx_max_entry - 1; 1443 1444 /* Set up the hdr offsets with 0s */ 1445 for (i = 0; i < qp->rx_max_entry; i++) { 1446 offset = (void *)(qp->rx_buff + qp->rx_max_frame * (i + 1) - 1447 sizeof(struct ntb_payload_header)); 1448 memset(offset, 0, sizeof(struct ntb_payload_header)); 1449 } 1450 1451 qp->rx_pkts = 0; 1452 qp->tx_pkts = 0; 1453 qp->tx_index = 0; 1454 1455 return (0); 1456 } 1457 1458 static void 1459 ntb_qp_link_work(void *arg) 1460 { 1461 struct ntb_transport_qp *qp = arg; 1462 struct ntb_softc *ntb = qp->ntb; 1463 struct ntb_transport_ctx *nt = qp->transport; 1464 uint32_t val, dummy; 1465 1466 ntb_spad_read(ntb, IF_NTB_QP_LINKS, &val); 1467 1468 ntb_peer_spad_write(ntb, IF_NTB_QP_LINKS, val | (1ull << qp->qp_num)); 1469 1470 /* query remote spad for qp ready bits */ 1471 ntb_peer_spad_read(ntb, IF_NTB_QP_LINKS, &dummy); 1472 1473 /* See if the remote side is up */ 1474 if ((val & (1ull << qp->qp_num)) != 0) { 1475 ntb_printf(2, "qp link up\n"); 1476 qp->link_is_up = true; 1477 1478 if (qp->event_handler != NULL) 1479 qp->event_handler(qp->cb_data, NTB_LINK_UP); 1480 1481 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1482 } else if (nt->link_is_up) 1483 callout_reset(&qp->link_work, 1484 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1485 } 1486 1487 /* Link down event*/ 1488 static void 1489 ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) 1490 { 1491 struct ntb_transport_qp *qp; 1492 struct _qpset qp_bitmap_alloc; 1493 unsigned i; 1494 1495 BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &qp_bitmap_alloc); 1496 BIT_NAND(QP_SETSIZE, &qp_bitmap_alloc, &nt->qp_bitmap_free); 1497 1498 /* Pass along the info to any clients */ 1499 for (i = 0; i < nt->qp_count; i++) 1500 if (test_bit(i, &qp_bitmap_alloc)) { 1501 qp = &nt->qp_vec[i]; 1502 ntb_qp_link_cleanup(qp); 1503 callout_drain(&qp->link_work); 1504 } 1505 1506 if (!nt->link_is_up) 1507 callout_drain(&nt->link_work); 1508 1509 /* 1510 * The scratchpad registers keep the values if the remote side 1511 * goes down, blast them now to give them a sane value the next 1512 * time they are accessed 1513 */ 1514 for (i = 0; i < IF_NTB_MAX_SPAD; i++) 1515 ntb_spad_write(nt->ntb, i, 0); 1516 } 1517 1518 static void 1519 ntb_transport_link_cleanup_work(void *arg, int pending __unused) 1520 { 1521 1522 ntb_transport_link_cleanup(arg); 1523 } 1524 1525 static void 1526 ntb_qp_link_down(struct ntb_transport_qp *qp) 1527 { 1528 1529 ntb_qp_link_cleanup(qp); 1530 } 1531 1532 static void 1533 ntb_qp_link_down_reset(struct ntb_transport_qp *qp) 1534 { 1535 1536 qp->link_is_up = false; 1537 1538 qp->tx_index = qp->rx_index = 0; 1539 qp->tx_bytes = qp->rx_bytes = 0; 1540 qp->tx_pkts = qp->rx_pkts = 0; 1541 1542 qp->rx_ring_empty = 0; 1543 qp->tx_ring_full = 0; 1544 1545 qp->rx_err_no_buf = qp->tx_err_no_buf = 0; 1546 qp->rx_err_oflow = qp->rx_err_ver = 0; 1547 } 1548 1549 static void 1550 ntb_qp_link_cleanup(struct ntb_transport_qp *qp) 1551 { 1552 struct ntb_transport_ctx *nt = qp->transport; 1553 1554 callout_drain(&qp->link_work); 1555 ntb_qp_link_down_reset(qp); 1556 1557 if (qp->event_handler != NULL) 1558 qp->event_handler(qp->cb_data, NTB_LINK_DOWN); 1559 1560 if (nt->link_is_up) 1561 callout_reset(&qp->link_work, 1562 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1563 } 1564 1565 /* Link commanded down */ 1566 /** 1567 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data 1568 * @qp: NTB transport layer queue to be disabled 1569 * 1570 * Notify NTB transport layer of client's desire to no longer receive data on 1571 * transport queue specified. It is the client's responsibility to ensure all 1572 * entries on queue are purged or otherwise handled appropriately. 1573 */ 1574 static void 1575 ntb_transport_link_down(struct ntb_transport_qp *qp) 1576 { 1577 uint32_t val; 1578 1579 if (qp == NULL) 1580 return; 1581 1582 qp->client_ready = false; 1583 1584 ntb_spad_read(qp->ntb, IF_NTB_QP_LINKS, &val); 1585 1586 ntb_peer_spad_write(qp->ntb, IF_NTB_QP_LINKS, 1587 val & ~(1 << qp->qp_num)); 1588 1589 if (qp->link_is_up) 1590 ntb_send_link_down(qp); 1591 else 1592 callout_drain(&qp->link_work); 1593 } 1594 1595 static void 1596 ntb_send_link_down(struct ntb_transport_qp *qp) 1597 { 1598 struct ntb_queue_entry *entry; 1599 int i, rc; 1600 1601 if (!qp->link_is_up) 1602 return; 1603 1604 for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { 1605 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 1606 if (entry != NULL) 1607 break; 1608 pause("NTB Wait for link down", hz / 10); 1609 } 1610 1611 if (entry == NULL) 1612 return; 1613 1614 entry->cb_data = NULL; 1615 entry->buf = NULL; 1616 entry->len = 0; 1617 entry->flags = IF_NTB_LINK_DOWN_FLAG; 1618 1619 mtx_lock(&qp->transport->tx_lock); 1620 rc = ntb_process_tx(qp, entry); 1621 if (rc != 0) 1622 printf("ntb: Failed to send link down\n"); 1623 mtx_unlock(&qp->transport->tx_lock); 1624 1625 ntb_qp_link_down_reset(qp); 1626 } 1627 1628 1629 /* List Management */ 1630 1631 static void 1632 ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 1633 struct ntb_queue_list *list) 1634 { 1635 1636 mtx_lock_spin(lock); 1637 STAILQ_INSERT_TAIL(list, entry, entry); 1638 mtx_unlock_spin(lock); 1639 } 1640 1641 static struct ntb_queue_entry * 1642 ntb_list_rm(struct mtx *lock, struct ntb_queue_list *list) 1643 { 1644 struct ntb_queue_entry *entry; 1645 1646 mtx_lock_spin(lock); 1647 if (STAILQ_EMPTY(list)) { 1648 entry = NULL; 1649 goto out; 1650 } 1651 entry = STAILQ_FIRST(list); 1652 STAILQ_REMOVE_HEAD(list, entry); 1653 out: 1654 mtx_unlock_spin(lock); 1655 1656 return (entry); 1657 } 1658 1659 static struct ntb_queue_entry * 1660 ntb_list_mv(struct mtx *lock, struct ntb_queue_list *from, 1661 struct ntb_queue_list *to) 1662 { 1663 struct ntb_queue_entry *entry; 1664 1665 mtx_lock_spin(lock); 1666 if (STAILQ_EMPTY(from)) { 1667 entry = NULL; 1668 goto out; 1669 } 1670 entry = STAILQ_FIRST(from); 1671 STAILQ_REMOVE_HEAD(from, entry); 1672 STAILQ_INSERT_TAIL(to, entry, entry); 1673 1674 out: 1675 mtx_unlock_spin(lock); 1676 return (entry); 1677 } 1678 1679 /* Helper functions */ 1680 /* TODO: This too should really be part of the kernel */ 1681 #define EUI48_MULTICAST 1 << 0 1682 #define EUI48_LOCALLY_ADMINISTERED 1 << 1 1683 static void 1684 create_random_local_eui48(u_char *eaddr) 1685 { 1686 static uint8_t counter = 0; 1687 uint32_t seed = ticks; 1688 1689 eaddr[0] = EUI48_LOCALLY_ADMINISTERED; 1690 memcpy(&eaddr[1], &seed, sizeof(uint32_t)); 1691 eaddr[5] = counter++; 1692 } 1693 1694 /** 1695 * ntb_transport_max_size - Query the max payload size of a qp 1696 * @qp: NTB transport layer queue to be queried 1697 * 1698 * Query the maximum payload size permissible on the given qp 1699 * 1700 * RETURNS: the max payload size of a qp 1701 */ 1702 static unsigned int 1703 ntb_transport_max_size(struct ntb_transport_qp *qp) 1704 { 1705 1706 if (qp == NULL) 1707 return (0); 1708 1709 return (qp->tx_max_frame - sizeof(struct ntb_payload_header)); 1710 } 1711