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 rc = ntb_mw_set_wc(nt->ntb, i, VM_MEMATTR_WRITE_COMBINING); 621 if (rc) 622 ntb_printf(0, "Unable to set mw%d caching\n", i); 623 } 624 625 qp_bitmap = ntb_db_valid_mask(ntb); 626 nt->qp_count = flsll(qp_bitmap); 627 KASSERT(nt->qp_count != 0, ("bogus db bitmap")); 628 nt->qp_count -= 1; 629 630 if (max_num_clients != 0 && max_num_clients < nt->qp_count) 631 nt->qp_count = max_num_clients; 632 else if (nt->mw_count < nt->qp_count) 633 nt->qp_count = nt->mw_count; 634 KASSERT(nt->qp_count <= QP_SETSIZE, ("invalid qp_count")); 635 636 mtx_init(&nt->tx_lock, "ntb transport tx", NULL, MTX_DEF); 637 mtx_init(&nt->rx_lock, "ntb transport rx", NULL, MTX_DEF); 638 639 nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_IF, 640 M_WAITOK | M_ZERO); 641 642 for (i = 0; i < nt->qp_count; i++) { 643 set_bit(i, &nt->qp_bitmap); 644 set_bit(i, &nt->qp_bitmap_free); 645 ntb_transport_init_queue(nt, i); 646 } 647 648 callout_init(&nt->link_work, 0); 649 callout_init(&nt->link_watchdog, 0); 650 TASK_INIT(&nt->link_cleanup, 0, ntb_transport_link_cleanup_work, nt); 651 652 rc = ntb_set_ctx(ntb, nt, &ntb_transport_ops); 653 if (rc != 0) 654 goto err; 655 656 nt->link_is_up = false; 657 ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); 658 ntb_link_event(ntb); 659 660 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 661 if (enable_xeon_watchdog != 0) 662 callout_reset(&nt->link_watchdog, 0, xeon_link_watchdog_hb, nt); 663 return (0); 664 665 err: 666 free(nt->qp_vec, M_NTB_IF); 667 nt->qp_vec = NULL; 668 return (rc); 669 } 670 671 static void 672 ntb_transport_free(struct ntb_transport_ctx *nt) 673 { 674 struct ntb_softc *ntb = nt->ntb; 675 struct _qpset qp_bitmap_alloc; 676 uint8_t i; 677 678 ntb_transport_link_cleanup(nt); 679 taskqueue_drain(taskqueue_swi, &nt->link_cleanup); 680 callout_drain(&nt->link_work); 681 callout_drain(&nt->link_watchdog); 682 683 BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &qp_bitmap_alloc); 684 BIT_NAND(QP_SETSIZE, &qp_bitmap_alloc, &nt->qp_bitmap_free); 685 686 /* Verify that all the QPs are freed */ 687 for (i = 0; i < nt->qp_count; i++) 688 if (test_bit(i, &qp_bitmap_alloc)) 689 ntb_transport_free_queue(&nt->qp_vec[i]); 690 691 ntb_link_disable(ntb); 692 ntb_clear_ctx(ntb); 693 694 for (i = 0; i < nt->mw_count; i++) 695 ntb_free_mw(nt, i); 696 697 free(nt->qp_vec, M_NTB_IF); 698 } 699 700 static void 701 ntb_transport_init_queue(struct ntb_transport_ctx *nt, unsigned int qp_num) 702 { 703 struct ntb_transport_mw *mw; 704 struct ntb_transport_qp *qp; 705 vm_paddr_t mw_base; 706 uint64_t mw_size, qp_offset; 707 size_t tx_size; 708 unsigned num_qps_mw, mw_num, mw_count; 709 710 mw_count = nt->mw_count; 711 mw_num = QP_TO_MW(nt, qp_num); 712 mw = &nt->mw_vec[mw_num]; 713 714 qp = &nt->qp_vec[qp_num]; 715 qp->qp_num = qp_num; 716 qp->transport = nt; 717 qp->ntb = nt->ntb; 718 qp->client_ready = false; 719 qp->event_handler = NULL; 720 ntb_qp_link_down_reset(qp); 721 722 if (nt->qp_count % mw_count && mw_num + 1 < nt->qp_count / mw_count) 723 num_qps_mw = nt->qp_count / mw_count + 1; 724 else 725 num_qps_mw = nt->qp_count / mw_count; 726 727 mw_base = mw->phys_addr; 728 mw_size = mw->phys_size; 729 730 tx_size = mw_size / num_qps_mw; 731 qp_offset = tx_size * (qp_num / mw_count); 732 733 qp->tx_mw = mw->vbase + qp_offset; 734 KASSERT(qp->tx_mw != NULL, ("uh oh?")); 735 736 /* XXX Assumes that a vm_paddr_t is equivalent to bus_addr_t */ 737 qp->tx_mw_phys = mw_base + qp_offset; 738 KASSERT(qp->tx_mw_phys != 0, ("uh oh?")); 739 740 tx_size -= sizeof(struct ntb_rx_info); 741 qp->rx_info = (void *)(qp->tx_mw + tx_size); 742 743 /* Due to house-keeping, there must be at least 2 buffs */ 744 qp->tx_max_frame = qmin(tx_size / 2, 745 transport_mtu + sizeof(struct ntb_payload_header)); 746 qp->tx_max_entry = tx_size / qp->tx_max_frame; 747 748 callout_init(&qp->link_work, 0); 749 callout_init(&qp->queue_full, 1); 750 callout_init(&qp->rx_full, 1); 751 752 mtx_init(&qp->ntb_rx_q_lock, "ntb rx q", NULL, MTX_SPIN); 753 mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN); 754 TASK_INIT(&qp->rx_completion_task, 0, ntb_complete_rxc, qp); 755 TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp); 756 757 STAILQ_INIT(&qp->rx_post_q); 758 STAILQ_INIT(&qp->rx_pend_q); 759 STAILQ_INIT(&qp->tx_free_q); 760 761 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 762 } 763 764 static void 765 ntb_transport_free_queue(struct ntb_transport_qp *qp) 766 { 767 struct ntb_queue_entry *entry; 768 769 if (qp == NULL) 770 return; 771 772 callout_drain(&qp->link_work); 773 774 ntb_db_set_mask(qp->ntb, 1ull << qp->qp_num); 775 taskqueue_drain(taskqueue_swi, &qp->rxc_db_work); 776 taskqueue_drain(taskqueue_swi, &qp->rx_completion_task); 777 778 qp->cb_data = NULL; 779 qp->rx_handler = NULL; 780 qp->tx_handler = NULL; 781 qp->event_handler = NULL; 782 783 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q))) 784 free(entry, M_NTB_IF); 785 786 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q))) 787 free(entry, M_NTB_IF); 788 789 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 790 free(entry, M_NTB_IF); 791 792 set_bit(qp->qp_num, &qp->transport->qp_bitmap_free); 793 } 794 795 /** 796 * ntb_transport_create_queue - Create a new NTB transport layer queue 797 * @rx_handler: receive callback function 798 * @tx_handler: transmit callback function 799 * @event_handler: event callback function 800 * 801 * Create a new NTB transport layer queue and provide the queue with a callback 802 * routine for both transmit and receive. The receive callback routine will be 803 * used to pass up data when the transport has received it on the queue. The 804 * transmit callback routine will be called when the transport has completed the 805 * transmission of the data on the queue and the data is ready to be freed. 806 * 807 * RETURNS: pointer to newly created ntb_queue, NULL on error. 808 */ 809 static struct ntb_transport_qp * 810 ntb_transport_create_queue(void *data, struct ntb_softc *ntb, 811 const struct ntb_queue_handlers *handlers) 812 { 813 struct ntb_queue_entry *entry; 814 struct ntb_transport_qp *qp; 815 struct ntb_transport_ctx *nt; 816 unsigned int free_queue; 817 int i; 818 819 nt = ntb_get_ctx(ntb, NULL); 820 KASSERT(nt != NULL, ("bogus")); 821 822 free_queue = ffs_bit(&nt->qp_bitmap); 823 if (free_queue == 0) 824 return (NULL); 825 826 /* decrement free_queue to make it zero based */ 827 free_queue--; 828 829 qp = &nt->qp_vec[free_queue]; 830 clear_bit(qp->qp_num, &nt->qp_bitmap_free); 831 qp->cb_data = data; 832 qp->rx_handler = handlers->rx_handler; 833 qp->tx_handler = handlers->tx_handler; 834 qp->event_handler = handlers->event_handler; 835 836 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 837 entry = malloc(sizeof(*entry), M_NTB_IF, M_WAITOK | M_ZERO); 838 entry->cb_data = nt->ifp; 839 entry->buf = NULL; 840 entry->len = transport_mtu; 841 ntb_list_add(&qp->ntb_rx_q_lock, entry, &qp->rx_pend_q); 842 } 843 844 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 845 entry = malloc(sizeof(*entry), M_NTB_IF, M_WAITOK | M_ZERO); 846 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 847 } 848 849 ntb_db_clear(ntb, 1ull << qp->qp_num); 850 ntb_db_clear_mask(ntb, 1ull << qp->qp_num); 851 return (qp); 852 } 853 854 /** 855 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue 856 * @qp: NTB transport layer queue to be enabled 857 * 858 * Notify NTB transport layer of client readiness to use queue 859 */ 860 static void 861 ntb_transport_link_up(struct ntb_transport_qp *qp) 862 { 863 struct ntb_transport_ctx *nt; 864 865 if (qp == NULL) 866 return; 867 868 qp->client_ready = true; 869 870 nt = qp->transport; 871 ntb_printf(2, "qp client ready\n"); 872 873 if (qp->transport->link_is_up) 874 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 875 } 876 877 878 879 /* Transport Tx */ 880 881 /** 882 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry 883 * @qp: NTB transport layer queue the entry is to be enqueued on 884 * @cb: per buffer pointer for callback function to use 885 * @data: pointer to data buffer that will be sent 886 * @len: length of the data buffer 887 * 888 * Enqueue a new transmit buffer onto the transport queue from which a NTB 889 * payload will be transmitted. This assumes that a lock is being held to 890 * serialize access to the qp. 891 * 892 * RETURNS: An appropriate ERRNO error value on error, or zero for success. 893 */ 894 static int 895 ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, 896 unsigned int len) 897 { 898 struct ntb_queue_entry *entry; 899 int rc; 900 901 if (qp == NULL || !qp->link_is_up || len == 0) { 902 CTR0(KTR_NTB, "TX: link not up"); 903 return (EINVAL); 904 } 905 906 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 907 if (entry == NULL) { 908 CTR0(KTR_NTB, "TX: could not get entry from tx_free_q"); 909 qp->tx_err_no_buf++; 910 return (EBUSY); 911 } 912 CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry); 913 914 entry->cb_data = cb; 915 entry->buf = data; 916 entry->len = len; 917 entry->flags = 0; 918 919 rc = ntb_process_tx(qp, entry); 920 if (rc != 0) { 921 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 922 CTR1(KTR_NTB, 923 "TX: process_tx failed. Returning entry %p to tx_free_q", 924 entry); 925 } 926 return (rc); 927 } 928 929 static int 930 ntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry) 931 { 932 void *offset; 933 934 offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index; 935 CTR3(KTR_NTB, 936 "TX: process_tx: tx_pkts=%lu, tx_index=%u, remote entry=%u", 937 qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry); 938 if (qp->tx_index == qp->remote_rx_info->entry) { 939 CTR0(KTR_NTB, "TX: ring full"); 940 qp->tx_ring_full++; 941 return (EAGAIN); 942 } 943 944 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { 945 if (qp->tx_handler != NULL) 946 qp->tx_handler(qp, qp->cb_data, entry->buf, 947 EIO); 948 else 949 m_freem(entry->buf); 950 951 entry->buf = NULL; 952 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 953 CTR1(KTR_NTB, 954 "TX: frame too big. returning entry %p to tx_free_q", 955 entry); 956 return (0); 957 } 958 CTR2(KTR_NTB, "TX: copying entry %p to offset %p", entry, offset); 959 ntb_memcpy_tx(qp, entry, offset); 960 961 qp->tx_index++; 962 qp->tx_index %= qp->tx_max_entry; 963 964 qp->tx_pkts++; 965 966 return (0); 967 } 968 969 static void 970 ntb_memcpy_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 971 void *offset) 972 { 973 struct ntb_payload_header *hdr; 974 975 /* This piece is from Linux' ntb_async_tx() */ 976 hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame - 977 sizeof(struct ntb_payload_header)); 978 entry->x_hdr = hdr; 979 iowrite32(entry->len, &hdr->len); 980 iowrite32(qp->tx_pkts, &hdr->ver); 981 982 /* This piece is ntb_memcpy_tx() */ 983 CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset); 984 if (entry->buf != NULL) { 985 m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset); 986 987 /* 988 * Ensure that the data is fully copied before setting the 989 * flags 990 */ 991 wmb(); 992 } 993 994 /* The rest is ntb_tx_copy_callback() */ 995 iowrite32(entry->flags | IF_NTB_DESC_DONE_FLAG, &hdr->flags); 996 CTR1(KTR_NTB, "TX: hdr %p set DESC_DONE", hdr); 997 998 ntb_peer_db_set(qp->ntb, 1ull << qp->qp_num); 999 1000 /* 1001 * The entry length can only be zero if the packet is intended to be a 1002 * "link down" or similar. Since no payload is being sent in these 1003 * cases, there is nothing to add to the completion queue. 1004 */ 1005 if (entry->len > 0) { 1006 qp->tx_bytes += entry->len; 1007 1008 if (qp->tx_handler) 1009 qp->tx_handler(qp, qp->cb_data, entry->buf, 1010 entry->len); 1011 else 1012 m_freem(entry->buf); 1013 entry->buf = NULL; 1014 } 1015 1016 CTR3(KTR_NTB, 1017 "TX: entry %p sent. hdr->ver = %u, hdr->flags = 0x%x, Returning " 1018 "to tx_free_q", entry, hdr->ver, hdr->flags); 1019 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 1020 } 1021 1022 static void 1023 ntb_qp_full(void *arg) 1024 { 1025 1026 CTR0(KTR_NTB, "TX: qp_full callout"); 1027 ntb_start(arg); 1028 } 1029 1030 /* Transport Rx */ 1031 static void 1032 ntb_transport_rxc_db(void *arg, int pending __unused) 1033 { 1034 struct ntb_transport_qp *qp = arg; 1035 ntb_q_idx_t i; 1036 int rc; 1037 1038 /* 1039 * Limit the number of packets processed in a single interrupt to 1040 * provide fairness to others 1041 */ 1042 CTR0(KTR_NTB, "RX: transport_rx"); 1043 mtx_lock(&qp->transport->rx_lock); 1044 for (i = 0; i < qp->rx_max_entry; i++) { 1045 rc = ntb_process_rxc(qp); 1046 if (rc != 0) { 1047 CTR0(KTR_NTB, "RX: process_rxc failed"); 1048 break; 1049 } 1050 } 1051 mtx_unlock(&qp->transport->rx_lock); 1052 1053 if (i == qp->rx_max_entry) 1054 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1055 else if ((ntb_db_read(qp->ntb) & (1ull << qp->qp_num)) != 0) { 1056 /* If db is set, clear it and read it back to commit clear. */ 1057 ntb_db_clear(qp->ntb, 1ull << qp->qp_num); 1058 (void)ntb_db_read(qp->ntb); 1059 1060 /* 1061 * An interrupt may have arrived between finishing 1062 * ntb_process_rxc and clearing the doorbell bit: there might 1063 * be some more work to do. 1064 */ 1065 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1066 } 1067 } 1068 1069 static int 1070 ntb_process_rxc(struct ntb_transport_qp *qp) 1071 { 1072 struct ntb_payload_header *hdr; 1073 struct ntb_queue_entry *entry; 1074 caddr_t offset; 1075 1076 offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index; 1077 hdr = (void *)(offset + qp->rx_max_frame - 1078 sizeof(struct ntb_payload_header)); 1079 1080 CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index); 1081 if ((hdr->flags & IF_NTB_DESC_DONE_FLAG) == 0) { 1082 CTR0(KTR_NTB, "RX: hdr not done"); 1083 qp->rx_ring_empty++; 1084 return (EAGAIN); 1085 } 1086 1087 if ((hdr->flags & IF_NTB_LINK_DOWN_FLAG) != 0) { 1088 CTR0(KTR_NTB, "RX: link down"); 1089 ntb_qp_link_down(qp); 1090 hdr->flags = 0; 1091 return (EAGAIN); 1092 } 1093 1094 if (hdr->ver != (uint32_t)qp->rx_pkts) { 1095 CTR2(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). " 1096 "Returning entry to rx_pend_q", hdr->ver, qp->rx_pkts); 1097 qp->rx_err_ver++; 1098 return (EIO); 1099 } 1100 1101 entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q); 1102 if (entry == NULL) { 1103 qp->rx_err_no_buf++; 1104 CTR0(KTR_NTB, "RX: No entries in rx_pend_q"); 1105 return (EAGAIN); 1106 } 1107 callout_stop(&qp->rx_full); 1108 CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry); 1109 1110 entry->x_hdr = hdr; 1111 entry->index = qp->rx_index; 1112 1113 if (hdr->len > entry->len) { 1114 CTR2(KTR_NTB, "RX: len too long. Wanted %ju got %ju", 1115 (uintmax_t)hdr->len, (uintmax_t)entry->len); 1116 qp->rx_err_oflow++; 1117 1118 entry->len = -EIO; 1119 entry->flags |= IF_NTB_DESC_DONE_FLAG; 1120 1121 taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 1122 } else { 1123 qp->rx_bytes += hdr->len; 1124 qp->rx_pkts++; 1125 1126 CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts); 1127 1128 entry->len = hdr->len; 1129 1130 ntb_memcpy_rx(qp, entry, offset); 1131 } 1132 1133 qp->rx_index++; 1134 qp->rx_index %= qp->rx_max_entry; 1135 return (0); 1136 } 1137 1138 static void 1139 ntb_memcpy_rx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 1140 void *offset) 1141 { 1142 struct ifnet *ifp = entry->cb_data; 1143 unsigned int len = entry->len; 1144 struct mbuf *m; 1145 1146 CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset); 1147 m = m_devget(offset, len, 0, ifp, NULL); 1148 m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID; 1149 1150 entry->buf = (void *)m; 1151 1152 /* Ensure that the data is globally visible before clearing the flag */ 1153 wmb(); 1154 1155 CTR2(KTR_NTB, "RX: copied entry %p to mbuf %p.", entry, m); 1156 ntb_rx_copy_callback(qp, entry); 1157 } 1158 1159 static inline void 1160 ntb_rx_copy_callback(struct ntb_transport_qp *qp, void *data) 1161 { 1162 struct ntb_queue_entry *entry; 1163 1164 entry = data; 1165 entry->flags |= IF_NTB_DESC_DONE_FLAG; 1166 taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 1167 } 1168 1169 static void 1170 ntb_complete_rxc(void *arg, int pending) 1171 { 1172 struct ntb_transport_qp *qp = arg; 1173 struct ntb_queue_entry *entry; 1174 struct mbuf *m; 1175 unsigned len; 1176 1177 CTR0(KTR_NTB, "RX: rx_completion_task"); 1178 1179 mtx_lock_spin(&qp->ntb_rx_q_lock); 1180 1181 while (!STAILQ_EMPTY(&qp->rx_post_q)) { 1182 entry = STAILQ_FIRST(&qp->rx_post_q); 1183 if ((entry->flags & IF_NTB_DESC_DONE_FLAG) == 0) 1184 break; 1185 1186 entry->x_hdr->flags = 0; 1187 iowrite32(entry->index, &qp->rx_info->entry); 1188 1189 STAILQ_REMOVE_HEAD(&qp->rx_post_q, entry); 1190 1191 len = entry->len; 1192 m = entry->buf; 1193 1194 /* 1195 * Re-initialize queue_entry for reuse; rx_handler takes 1196 * ownership of the mbuf. 1197 */ 1198 entry->buf = NULL; 1199 entry->len = transport_mtu; 1200 entry->cb_data = qp->transport->ifp; 1201 1202 STAILQ_INSERT_TAIL(&qp->rx_pend_q, entry, entry); 1203 1204 mtx_unlock_spin(&qp->ntb_rx_q_lock); 1205 1206 CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m); 1207 if (qp->rx_handler != NULL && qp->client_ready) 1208 qp->rx_handler(qp, qp->cb_data, m, len); 1209 else 1210 m_freem(m); 1211 1212 mtx_lock_spin(&qp->ntb_rx_q_lock); 1213 } 1214 1215 mtx_unlock_spin(&qp->ntb_rx_q_lock); 1216 } 1217 1218 static void 1219 ntb_transport_doorbell_callback(void *data, uint32_t vector) 1220 { 1221 struct ntb_transport_ctx *nt = data; 1222 struct ntb_transport_qp *qp; 1223 struct _qpset db_bits; 1224 uint64_t vec_mask; 1225 unsigned qp_num; 1226 1227 BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &db_bits); 1228 BIT_NAND(QP_SETSIZE, &db_bits, &nt->qp_bitmap_free); 1229 1230 vec_mask = ntb_db_vector_mask(nt->ntb, vector); 1231 while (vec_mask != 0) { 1232 qp_num = ffsll(vec_mask) - 1; 1233 1234 if (test_bit(qp_num, &db_bits)) { 1235 qp = &nt->qp_vec[qp_num]; 1236 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1237 } 1238 1239 vec_mask &= ~(1ull << qp_num); 1240 } 1241 } 1242 1243 /* Link Event handler */ 1244 static void 1245 ntb_transport_event_callback(void *data) 1246 { 1247 struct ntb_transport_ctx *nt = data; 1248 1249 if (ntb_link_is_up(nt->ntb, NULL, NULL)) { 1250 ntb_printf(1, "HW link up\n"); 1251 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 1252 } else { 1253 ntb_printf(1, "HW link down\n"); 1254 taskqueue_enqueue(taskqueue_swi, &nt->link_cleanup); 1255 } 1256 } 1257 1258 /* Link bring up */ 1259 static void 1260 ntb_transport_link_work(void *arg) 1261 { 1262 struct ntb_transport_ctx *nt = arg; 1263 struct ntb_softc *ntb = nt->ntb; 1264 struct ntb_transport_qp *qp; 1265 uint64_t val64, size; 1266 uint32_t val; 1267 unsigned i; 1268 int rc; 1269 1270 /* send the local info, in the opposite order of the way we read it */ 1271 for (i = 0; i < nt->mw_count; i++) { 1272 size = nt->mw_vec[i].phys_size; 1273 1274 if (max_mw_size != 0 && size > max_mw_size) 1275 size = max_mw_size; 1276 1277 ntb_peer_spad_write(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1278 size >> 32); 1279 ntb_peer_spad_write(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), size); 1280 } 1281 1282 ntb_peer_spad_write(ntb, IF_NTB_NUM_MWS, nt->mw_count); 1283 1284 ntb_peer_spad_write(ntb, IF_NTB_NUM_QPS, nt->qp_count); 1285 1286 ntb_peer_spad_write(ntb, IF_NTB_VERSION, NTB_TRANSPORT_VERSION); 1287 1288 /* Query the remote side for its info */ 1289 val = 0; 1290 ntb_spad_read(ntb, IF_NTB_VERSION, &val); 1291 if (val != NTB_TRANSPORT_VERSION) 1292 goto out; 1293 1294 ntb_spad_read(ntb, IF_NTB_NUM_QPS, &val); 1295 if (val != nt->qp_count) 1296 goto out; 1297 1298 ntb_spad_read(ntb, IF_NTB_NUM_MWS, &val); 1299 if (val != nt->mw_count) 1300 goto out; 1301 1302 for (i = 0; i < nt->mw_count; i++) { 1303 ntb_spad_read(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), &val); 1304 val64 = (uint64_t)val << 32; 1305 1306 ntb_spad_read(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), &val); 1307 val64 |= val; 1308 1309 rc = ntb_set_mw(nt, i, val64); 1310 if (rc != 0) 1311 goto free_mws; 1312 } 1313 1314 nt->link_is_up = true; 1315 ntb_printf(1, "transport link up\n"); 1316 1317 for (i = 0; i < nt->qp_count; i++) { 1318 qp = &nt->qp_vec[i]; 1319 1320 ntb_transport_setup_qp_mw(nt, i); 1321 1322 if (qp->client_ready) 1323 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 1324 } 1325 1326 return; 1327 1328 free_mws: 1329 for (i = 0; i < nt->mw_count; i++) 1330 ntb_free_mw(nt, i); 1331 out: 1332 if (ntb_link_is_up(ntb, NULL, NULL)) 1333 callout_reset(&nt->link_work, 1334 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt); 1335 } 1336 1337 static int 1338 ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, size_t size) 1339 { 1340 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; 1341 size_t xlat_size, buff_size; 1342 int rc; 1343 1344 if (size == 0) 1345 return (EINVAL); 1346 1347 xlat_size = roundup(size, mw->xlat_align_size); 1348 buff_size = xlat_size; 1349 1350 /* No need to re-setup */ 1351 if (mw->xlat_size == xlat_size) 1352 return (0); 1353 1354 if (mw->buff_size != 0) 1355 ntb_free_mw(nt, num_mw); 1356 1357 /* Alloc memory for receiving data. Must be aligned */ 1358 mw->xlat_size = xlat_size; 1359 mw->buff_size = buff_size; 1360 1361 mw->virt_addr = contigmalloc(mw->buff_size, M_NTB_IF, M_ZERO, 0, 1362 mw->addr_limit, mw->xlat_align, 0); 1363 if (mw->virt_addr == NULL) { 1364 ntb_printf(0, "Unable to allocate MW buffer of size %zu/%zu\n", 1365 mw->buff_size, mw->xlat_size); 1366 mw->xlat_size = 0; 1367 mw->buff_size = 0; 1368 return (ENOMEM); 1369 } 1370 /* TODO: replace with bus_space_* functions */ 1371 mw->dma_addr = vtophys(mw->virt_addr); 1372 1373 /* 1374 * Ensure that the allocation from contigmalloc is aligned as 1375 * requested. XXX: This may not be needed -- brought in for parity 1376 * with the Linux driver. 1377 */ 1378 if (mw->dma_addr % mw->xlat_align != 0) { 1379 ntb_printf(0, 1380 "DMA memory 0x%jx not aligned to BAR size 0x%zx\n", 1381 (uintmax_t)mw->dma_addr, size); 1382 ntb_free_mw(nt, num_mw); 1383 return (ENOMEM); 1384 } 1385 1386 /* Notify HW the memory location of the receive buffer */ 1387 rc = ntb_mw_set_trans(nt->ntb, num_mw, mw->dma_addr, mw->xlat_size); 1388 if (rc) { 1389 ntb_printf(0, "Unable to set mw%d translation\n", num_mw); 1390 ntb_free_mw(nt, num_mw); 1391 return (rc); 1392 } 1393 1394 return (0); 1395 } 1396 1397 static void 1398 ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) 1399 { 1400 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; 1401 1402 if (mw->virt_addr == NULL) 1403 return; 1404 1405 ntb_mw_clear_trans(nt->ntb, num_mw); 1406 contigfree(mw->virt_addr, mw->xlat_size, M_NTB_IF); 1407 mw->xlat_size = 0; 1408 mw->buff_size = 0; 1409 mw->virt_addr = NULL; 1410 } 1411 1412 static int 1413 ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, unsigned int qp_num) 1414 { 1415 struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; 1416 struct ntb_transport_mw *mw; 1417 void *offset; 1418 ntb_q_idx_t i; 1419 size_t rx_size; 1420 unsigned num_qps_mw, mw_num, mw_count; 1421 1422 mw_count = nt->mw_count; 1423 mw_num = QP_TO_MW(nt, qp_num); 1424 mw = &nt->mw_vec[mw_num]; 1425 1426 if (mw->virt_addr == NULL) 1427 return (ENOMEM); 1428 1429 if (nt->qp_count % mw_count && mw_num + 1 < nt->qp_count / mw_count) 1430 num_qps_mw = nt->qp_count / mw_count + 1; 1431 else 1432 num_qps_mw = nt->qp_count / mw_count; 1433 1434 rx_size = mw->xlat_size / num_qps_mw; 1435 qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count); 1436 rx_size -= sizeof(struct ntb_rx_info); 1437 1438 qp->remote_rx_info = (void*)(qp->rx_buff + rx_size); 1439 1440 /* Due to house-keeping, there must be at least 2 buffs */ 1441 qp->rx_max_frame = qmin(rx_size / 2, 1442 transport_mtu + sizeof(struct ntb_payload_header)); 1443 qp->rx_max_entry = rx_size / qp->rx_max_frame; 1444 qp->rx_index = 0; 1445 1446 qp->remote_rx_info->entry = qp->rx_max_entry - 1; 1447 1448 /* Set up the hdr offsets with 0s */ 1449 for (i = 0; i < qp->rx_max_entry; i++) { 1450 offset = (void *)(qp->rx_buff + qp->rx_max_frame * (i + 1) - 1451 sizeof(struct ntb_payload_header)); 1452 memset(offset, 0, sizeof(struct ntb_payload_header)); 1453 } 1454 1455 qp->rx_pkts = 0; 1456 qp->tx_pkts = 0; 1457 qp->tx_index = 0; 1458 1459 return (0); 1460 } 1461 1462 static void 1463 ntb_qp_link_work(void *arg) 1464 { 1465 struct ntb_transport_qp *qp = arg; 1466 struct ntb_softc *ntb = qp->ntb; 1467 struct ntb_transport_ctx *nt = qp->transport; 1468 uint32_t val, dummy; 1469 1470 ntb_spad_read(ntb, IF_NTB_QP_LINKS, &val); 1471 1472 ntb_peer_spad_write(ntb, IF_NTB_QP_LINKS, val | (1ull << qp->qp_num)); 1473 1474 /* query remote spad for qp ready bits */ 1475 ntb_peer_spad_read(ntb, IF_NTB_QP_LINKS, &dummy); 1476 1477 /* See if the remote side is up */ 1478 if ((val & (1ull << qp->qp_num)) != 0) { 1479 ntb_printf(2, "qp link up\n"); 1480 qp->link_is_up = true; 1481 1482 if (qp->event_handler != NULL) 1483 qp->event_handler(qp->cb_data, NTB_LINK_UP); 1484 1485 taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1486 } else if (nt->link_is_up) 1487 callout_reset(&qp->link_work, 1488 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1489 } 1490 1491 /* Link down event*/ 1492 static void 1493 ntb_transport_link_cleanup(struct ntb_transport_ctx *nt) 1494 { 1495 struct ntb_transport_qp *qp; 1496 struct _qpset qp_bitmap_alloc; 1497 unsigned i; 1498 1499 BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &qp_bitmap_alloc); 1500 BIT_NAND(QP_SETSIZE, &qp_bitmap_alloc, &nt->qp_bitmap_free); 1501 1502 /* Pass along the info to any clients */ 1503 for (i = 0; i < nt->qp_count; i++) 1504 if (test_bit(i, &qp_bitmap_alloc)) { 1505 qp = &nt->qp_vec[i]; 1506 ntb_qp_link_cleanup(qp); 1507 callout_drain(&qp->link_work); 1508 } 1509 1510 if (!nt->link_is_up) 1511 callout_drain(&nt->link_work); 1512 1513 /* 1514 * The scratchpad registers keep the values if the remote side 1515 * goes down, blast them now to give them a sane value the next 1516 * time they are accessed 1517 */ 1518 for (i = 0; i < IF_NTB_MAX_SPAD; i++) 1519 ntb_spad_write(nt->ntb, i, 0); 1520 } 1521 1522 static void 1523 ntb_transport_link_cleanup_work(void *arg, int pending __unused) 1524 { 1525 1526 ntb_transport_link_cleanup(arg); 1527 } 1528 1529 static void 1530 ntb_qp_link_down(struct ntb_transport_qp *qp) 1531 { 1532 1533 ntb_qp_link_cleanup(qp); 1534 } 1535 1536 static void 1537 ntb_qp_link_down_reset(struct ntb_transport_qp *qp) 1538 { 1539 1540 qp->link_is_up = false; 1541 1542 qp->tx_index = qp->rx_index = 0; 1543 qp->tx_bytes = qp->rx_bytes = 0; 1544 qp->tx_pkts = qp->rx_pkts = 0; 1545 1546 qp->rx_ring_empty = 0; 1547 qp->tx_ring_full = 0; 1548 1549 qp->rx_err_no_buf = qp->tx_err_no_buf = 0; 1550 qp->rx_err_oflow = qp->rx_err_ver = 0; 1551 } 1552 1553 static void 1554 ntb_qp_link_cleanup(struct ntb_transport_qp *qp) 1555 { 1556 struct ntb_transport_ctx *nt = qp->transport; 1557 1558 callout_drain(&qp->link_work); 1559 ntb_qp_link_down_reset(qp); 1560 1561 if (qp->event_handler != NULL) 1562 qp->event_handler(qp->cb_data, NTB_LINK_DOWN); 1563 1564 if (nt->link_is_up) 1565 callout_reset(&qp->link_work, 1566 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1567 } 1568 1569 /* Link commanded down */ 1570 /** 1571 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data 1572 * @qp: NTB transport layer queue to be disabled 1573 * 1574 * Notify NTB transport layer of client's desire to no longer receive data on 1575 * transport queue specified. It is the client's responsibility to ensure all 1576 * entries on queue are purged or otherwise handled appropriately. 1577 */ 1578 static void 1579 ntb_transport_link_down(struct ntb_transport_qp *qp) 1580 { 1581 uint32_t val; 1582 1583 if (qp == NULL) 1584 return; 1585 1586 qp->client_ready = false; 1587 1588 ntb_spad_read(qp->ntb, IF_NTB_QP_LINKS, &val); 1589 1590 ntb_peer_spad_write(qp->ntb, IF_NTB_QP_LINKS, 1591 val & ~(1 << qp->qp_num)); 1592 1593 if (qp->link_is_up) 1594 ntb_send_link_down(qp); 1595 else 1596 callout_drain(&qp->link_work); 1597 } 1598 1599 static void 1600 ntb_send_link_down(struct ntb_transport_qp *qp) 1601 { 1602 struct ntb_queue_entry *entry; 1603 int i, rc; 1604 1605 if (!qp->link_is_up) 1606 return; 1607 1608 for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { 1609 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 1610 if (entry != NULL) 1611 break; 1612 pause("NTB Wait for link down", hz / 10); 1613 } 1614 1615 if (entry == NULL) 1616 return; 1617 1618 entry->cb_data = NULL; 1619 entry->buf = NULL; 1620 entry->len = 0; 1621 entry->flags = IF_NTB_LINK_DOWN_FLAG; 1622 1623 mtx_lock(&qp->transport->tx_lock); 1624 rc = ntb_process_tx(qp, entry); 1625 if (rc != 0) 1626 printf("ntb: Failed to send link down\n"); 1627 mtx_unlock(&qp->transport->tx_lock); 1628 1629 ntb_qp_link_down_reset(qp); 1630 } 1631 1632 1633 /* List Management */ 1634 1635 static void 1636 ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 1637 struct ntb_queue_list *list) 1638 { 1639 1640 mtx_lock_spin(lock); 1641 STAILQ_INSERT_TAIL(list, entry, entry); 1642 mtx_unlock_spin(lock); 1643 } 1644 1645 static struct ntb_queue_entry * 1646 ntb_list_rm(struct mtx *lock, struct ntb_queue_list *list) 1647 { 1648 struct ntb_queue_entry *entry; 1649 1650 mtx_lock_spin(lock); 1651 if (STAILQ_EMPTY(list)) { 1652 entry = NULL; 1653 goto out; 1654 } 1655 entry = STAILQ_FIRST(list); 1656 STAILQ_REMOVE_HEAD(list, entry); 1657 out: 1658 mtx_unlock_spin(lock); 1659 1660 return (entry); 1661 } 1662 1663 static struct ntb_queue_entry * 1664 ntb_list_mv(struct mtx *lock, struct ntb_queue_list *from, 1665 struct ntb_queue_list *to) 1666 { 1667 struct ntb_queue_entry *entry; 1668 1669 mtx_lock_spin(lock); 1670 if (STAILQ_EMPTY(from)) { 1671 entry = NULL; 1672 goto out; 1673 } 1674 entry = STAILQ_FIRST(from); 1675 STAILQ_REMOVE_HEAD(from, entry); 1676 STAILQ_INSERT_TAIL(to, entry, entry); 1677 1678 out: 1679 mtx_unlock_spin(lock); 1680 return (entry); 1681 } 1682 1683 /* Helper functions */ 1684 /* TODO: This too should really be part of the kernel */ 1685 #define EUI48_MULTICAST 1 << 0 1686 #define EUI48_LOCALLY_ADMINISTERED 1 << 1 1687 static void 1688 create_random_local_eui48(u_char *eaddr) 1689 { 1690 static uint8_t counter = 0; 1691 uint32_t seed = ticks; 1692 1693 eaddr[0] = EUI48_LOCALLY_ADMINISTERED; 1694 memcpy(&eaddr[1], &seed, sizeof(uint32_t)); 1695 eaddr[5] = counter++; 1696 } 1697 1698 /** 1699 * ntb_transport_max_size - Query the max payload size of a qp 1700 * @qp: NTB transport layer queue to be queried 1701 * 1702 * Query the maximum payload size permissible on the given qp 1703 * 1704 * RETURNS: the max payload size of a qp 1705 */ 1706 static unsigned int 1707 ntb_transport_max_size(struct ntb_transport_qp *qp) 1708 { 1709 1710 if (qp == NULL) 1711 return (0); 1712 1713 return (qp->tx_max_frame - sizeof(struct ntb_payload_header)); 1714 } 1715