2 * Copyright (c) 2016-2017 Alexander Motin <mav@FreeBSD.org>
3 * Copyright (C) 2013 Intel Corporation
4 * Copyright (C) 2015 EMC Corporation
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * The Non-Transparent Bridge (NTB) is a device that allows you to connect
31 * two or more systems using a PCI-e links, providing remote memory access.
33 * This module contains a transport for sending and receiving messages by
34 * writing to remote memory window(s) provided by underlying NTB device.
36 * NOTE: Much of the code in this module is shared with Linux. Any patches may
37 * be picked up and redistributed in Linux with a dual GPL/BSD license.
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include <sys/param.h>
44 #include <sys/kernel.h>
45 #include <sys/systm.h>
48 #include <sys/limits.h>
50 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <sys/mutex.h>
54 #include <sys/queue.h>
55 #include <sys/sysctl.h>
56 #include <sys/taskqueue.h>
61 #include <machine/bus.h>
64 #include "ntb_transport.h"
66 #define KTR_NTB KTR_SPARE3
68 #define NTB_TRANSPORT_VERSION 4
70 static SYSCTL_NODE(_hw, OID_AUTO, ntb_transport, CTLFLAG_RW, 0, "ntb_transport");
72 static unsigned g_ntb_transport_debug_level;
73 SYSCTL_UINT(_hw_ntb_transport, OID_AUTO, debug_level, CTLFLAG_RWTUN,
74 &g_ntb_transport_debug_level, 0,
75 "ntb_transport log level -- higher is more verbose");
76 #define ntb_printf(lvl, ...) do { \
77 if ((lvl) <= g_ntb_transport_debug_level) { \
78 printf(__VA_ARGS__); \
82 static unsigned transport_mtu = 0x10000;
84 static uint64_t max_mw_size;
85 SYSCTL_UQUAD(_hw_ntb_transport, OID_AUTO, max_mw_size, CTLFLAG_RDTUN, &max_mw_size, 0,
86 "If enabled (non-zero), limit the size of large memory windows. "
87 "Both sides of the NTB MUST set the same value here.");
89 static unsigned enable_xeon_watchdog;
90 SYSCTL_UINT(_hw_ntb_transport, OID_AUTO, enable_xeon_watchdog, CTLFLAG_RDTUN,
91 &enable_xeon_watchdog, 0, "If non-zero, write a register every second to "
92 "keep a watchdog from tearing down the NTB link");
94 STAILQ_HEAD(ntb_queue_list, ntb_queue_entry);
96 typedef uint32_t ntb_q_idx_t;
98 struct ntb_queue_entry {
99 /* ntb_queue list reference */
100 STAILQ_ENTRY(ntb_queue_entry) entry;
102 /* info on data to be transferred */
108 struct ntb_transport_qp *qp;
109 struct ntb_payload_header *x_hdr;
117 struct ntb_transport_qp {
118 struct ntb_transport_ctx *transport;
124 volatile bool link_is_up;
125 uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */
127 struct ntb_rx_info *rx_info;
128 struct ntb_rx_info *remote_rx_info;
130 void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data,
131 void *data, int len);
132 struct ntb_queue_list tx_free_q;
133 struct mtx ntb_tx_free_q_lock;
135 bus_addr_t tx_mw_phys;
136 ntb_q_idx_t tx_index;
137 ntb_q_idx_t tx_max_entry;
138 uint64_t tx_max_frame;
140 void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data,
141 void *data, int len);
142 struct ntb_queue_list rx_post_q;
143 struct ntb_queue_list rx_pend_q;
144 /* ntb_rx_q_lock: synchronize access to rx_XXXX_q */
145 struct mtx ntb_rx_q_lock;
146 struct task rxc_db_work;
147 struct taskqueue *rxc_tq;
149 ntb_q_idx_t rx_index;
150 ntb_q_idx_t rx_max_entry;
151 uint64_t rx_max_frame;
153 void (*event_handler)(void *data, enum ntb_link_event status);
154 struct callout link_work;
155 struct callout rx_full;
157 uint64_t last_rx_no_buf;
162 uint64_t rx_ring_empty;
163 uint64_t rx_err_no_buf;
164 uint64_t rx_err_oflow;
168 uint64_t tx_ring_full;
169 uint64_t tx_err_no_buf;
174 struct ntb_transport_mw {
175 vm_paddr_t phys_addr;
178 size_t xlat_align_size;
179 bus_addr_t addr_limit;
180 /* Tx buff is off vbase / phys_addr */
183 /* Rx buff is off virt_addr / dma_addr */
184 bus_dma_tag_t dma_tag;
185 bus_dmamap_t dma_map;
190 struct ntb_transport_child {
195 struct ntb_transport_child *next;
198 struct ntb_transport_ctx {
200 struct ntb_transport_child *child;
201 struct ntb_transport_mw *mw_vec;
202 struct ntb_transport_qp *qp_vec;
206 volatile bool link_is_up;
207 enum ntb_speed link_speed;
208 enum ntb_width link_width;
209 struct callout link_work;
210 struct callout link_watchdog;
211 struct task link_cleanup;
215 NTBT_DESC_DONE_FLAG = 1 << 0,
216 NTBT_LINK_DOWN_FLAG = 1 << 1,
219 struct ntb_payload_header {
227 * The order of this enum is part of the remote protocol. Do not
228 * reorder without bumping protocol version (and it's probably best
229 * to keep the protocol in lock-step with the Linux NTB driver.
236 * N.B.: transport_link_work assumes MW1 enums = MW0 + 2.
244 * Some NTB-using hardware have a watchdog to work around NTB hangs; if
245 * a register or doorbell isn't written every few seconds, the link is
246 * torn down. Write an otherwise unused register every few seconds to
247 * work around this watchdog.
249 NTBT_WATCHDOG_SPAD = 15
252 #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count)
253 #define NTB_QP_DEF_NUM_ENTRIES 100
254 #define NTB_LINK_DOWN_TIMEOUT 100
256 static int ntb_transport_probe(device_t dev);
257 static int ntb_transport_attach(device_t dev);
258 static int ntb_transport_detach(device_t dev);
259 static void ntb_transport_init_queue(struct ntb_transport_ctx *nt,
260 unsigned int qp_num);
261 static int ntb_process_tx(struct ntb_transport_qp *qp,
262 struct ntb_queue_entry *entry);
263 static void ntb_transport_rxc_db(void *arg, int pending);
264 static int ntb_process_rxc(struct ntb_transport_qp *qp);
265 static void ntb_memcpy_rx(struct ntb_transport_qp *qp,
266 struct ntb_queue_entry *entry, void *offset);
267 static inline void ntb_rx_copy_callback(struct ntb_transport_qp *qp,
269 static void ntb_complete_rxc(struct ntb_transport_qp *qp);
270 static void ntb_transport_doorbell_callback(void *data, uint32_t vector);
271 static void ntb_transport_event_callback(void *data);
272 static void ntb_transport_link_work(void *arg);
273 static int ntb_set_mw(struct ntb_transport_ctx *, int num_mw, size_t size);
274 static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw);
275 static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt,
276 unsigned int qp_num);
277 static void ntb_qp_link_work(void *arg);
278 static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt);
279 static void ntb_transport_link_cleanup_work(void *, int);
280 static void ntb_qp_link_down(struct ntb_transport_qp *qp);
281 static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp);
282 static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp);
283 static void ntb_send_link_down(struct ntb_transport_qp *qp);
284 static void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry,
285 struct ntb_queue_list *list);
286 static struct ntb_queue_entry *ntb_list_rm(struct mtx *lock,
287 struct ntb_queue_list *list);
288 static struct ntb_queue_entry *ntb_list_mv(struct mtx *lock,
289 struct ntb_queue_list *from, struct ntb_queue_list *to);
290 static void xeon_link_watchdog_hb(void *);
292 static const struct ntb_ctx_ops ntb_transport_ops = {
293 .link_event = ntb_transport_event_callback,
294 .db_event = ntb_transport_doorbell_callback,
297 MALLOC_DEFINE(M_NTB_T, "ntb_transport", "ntb transport driver");
300 iowrite32(uint32_t val, void *addr)
303 bus_space_write_4(X86_BUS_SPACE_MEM, 0/* HACK */, (uintptr_t)addr,
307 /* Transport Init and teardown */
310 xeon_link_watchdog_hb(void *arg)
312 struct ntb_transport_ctx *nt;
315 ntb_spad_write(nt->dev, NTBT_WATCHDOG_SPAD, 0);
316 callout_reset(&nt->link_watchdog, 1 * hz, xeon_link_watchdog_hb, nt);
320 ntb_transport_probe(device_t dev)
323 device_set_desc(dev, "NTB Transport");
328 ntb_transport_attach(device_t dev)
330 struct ntb_transport_ctx *nt = device_get_softc(dev);
331 struct ntb_transport_child **cpp = &nt->child;
332 struct ntb_transport_child *nc;
333 struct ntb_transport_mw *mw;
334 uint64_t db_bitmap, size;
335 int rc, i, db_count, spad_count, qp, qpu, qpo, qpt;
338 char *n, *np, *c, *name;
341 nt->mw_count = ntb_mw_count(dev);
342 spad_count = ntb_spad_count(dev);
343 db_bitmap = ntb_db_valid_mask(dev);
344 db_count = flsll(db_bitmap);
345 KASSERT(db_bitmap == (1 << db_count) - 1,
346 ("Doorbells are not sequential (%jx).\n", db_bitmap));
348 if (nt->mw_count == 0) {
349 device_printf(dev, "At least 1 memory window required.\n");
352 if (spad_count < 6) {
353 device_printf(dev, "At least 6 scratchpads required.\n");
356 if (spad_count < 4 + 2 * nt->mw_count) {
357 nt->mw_count = (spad_count - 4) / 2;
358 device_printf(dev, "Scratchpads enough only for %d "
359 "memory windows.\n", nt->mw_count);
361 if (db_bitmap == 0) {
362 device_printf(dev, "At least one doorbell required.\n");
366 nt->mw_vec = malloc(nt->mw_count * sizeof(*nt->mw_vec), M_NTB_T,
368 for (i = 0; i < nt->mw_count; i++) {
371 rc = ntb_mw_get_range(dev, i, &mw->phys_addr, &mw->vbase,
372 &mw->phys_size, &mw->xlat_align, &mw->xlat_align_size,
378 mw->virt_addr = NULL;
381 rc = ntb_mw_set_wc(dev, i, VM_MEMATTR_WRITE_COMBINING);
383 ntb_printf(0, "Unable to set mw%d caching\n", i);
386 * Try to preallocate receive memory early, since there may
387 * be not enough contiguous memory later. It is quite likely
388 * that NTB windows are symmetric and this allocation remain,
389 * but even if not, we will just reallocate it later.
391 size = mw->phys_size;
392 if (max_mw_size != 0 && size > max_mw_size)
394 ntb_set_mw(nt, i, size);
398 qpo = imin(db_count, nt->mw_count);
401 snprintf(buf, sizeof(buf), "hint.%s.%d.config", device_get_name(dev),
402 device_get_unit(dev));
403 TUNABLE_STR_FETCH(buf, cfg, sizeof(cfg));
406 while ((c = strsep(&n, ",")) != NULL) {
408 name = strsep(&np, ":");
409 if (name != NULL && name[0] == 0)
411 qp = (np && np[0] != 0) ? strtol(np, NULL, 10) : qpo - qpu;
415 if (qp > qpt - qpu) {
416 device_printf(dev, "Not enough resources for config\n");
420 nc = malloc(sizeof(*nc), M_DEVBUF, M_WAITOK | M_ZERO);
424 nc->dev = device_add_child(dev, name, -1);
425 if (nc->dev == NULL) {
426 device_printf(dev, "Can not add child.\n");
429 device_set_ivars(nc->dev, nc);
434 device_printf(dev, "%d \"%s\": queues %d",
437 printf("-%d", qpu + qp - 1);
446 nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_T,
449 for (i = 0; i < nt->qp_count; i++)
450 ntb_transport_init_queue(nt, i);
452 callout_init(&nt->link_work, 0);
453 callout_init(&nt->link_watchdog, 0);
454 TASK_INIT(&nt->link_cleanup, 0, ntb_transport_link_cleanup_work, nt);
455 nt->link_is_up = false;
457 rc = ntb_set_ctx(dev, nt, &ntb_transport_ops);
461 ntb_link_enable(dev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
463 for (i = 0; i < nt->mw_count; i++) {
465 rc = ntb_mw_set_trans(nt->dev, i, mw->dma_addr, mw->buff_size);
467 ntb_printf(0, "load time mw%d xlat fails, rc %d\n", i, rc);
470 if (enable_xeon_watchdog != 0)
471 callout_reset(&nt->link_watchdog, 0, xeon_link_watchdog_hb, nt);
473 bus_generic_attach(dev);
477 free(nt->qp_vec, M_NTB_T);
478 free(nt->mw_vec, M_NTB_T);
483 ntb_transport_detach(device_t dev)
485 struct ntb_transport_ctx *nt = device_get_softc(dev);
486 struct ntb_transport_child **cpp = &nt->child;
487 struct ntb_transport_child *nc;
490 while ((nc = *cpp) != NULL) {
492 error = device_delete_child(dev, nc->dev);
497 KASSERT(nt->qp_bitmap == 0,
498 ("Some queues not freed on detach (%jx)", nt->qp_bitmap));
500 ntb_transport_link_cleanup(nt);
501 taskqueue_drain(taskqueue_swi, &nt->link_cleanup);
502 callout_drain(&nt->link_work);
503 callout_drain(&nt->link_watchdog);
505 ntb_link_disable(dev);
508 for (i = 0; i < nt->mw_count; i++)
511 free(nt->qp_vec, M_NTB_T);
512 free(nt->mw_vec, M_NTB_T);
517 ntb_transport_print_child(device_t dev, device_t child)
519 struct ntb_transport_child *nc = device_get_ivars(child);
522 retval = bus_print_child_header(dev, child);
524 printf(" queue %d", nc->qpoff);
526 printf("-%d", nc->qpoff + nc->qpcnt - 1);
528 retval += printf(" at consumer %d", nc->consumer);
529 retval += bus_print_child_domain(dev, child);
530 retval += bus_print_child_footer(dev, child);
536 ntb_transport_child_location_str(device_t dev, device_t child, char *buf,
539 struct ntb_transport_child *nc = device_get_ivars(child);
541 snprintf(buf, buflen, "consumer=%d", nc->consumer);
546 ntb_transport_queue_count(device_t dev)
548 struct ntb_transport_child *nc = device_get_ivars(dev);
554 ntb_transport_init_queue(struct ntb_transport_ctx *nt, unsigned int qp_num)
556 struct ntb_transport_mw *mw;
557 struct ntb_transport_qp *qp;
559 uint64_t mw_size, qp_offset;
561 unsigned num_qps_mw, mw_num, mw_count;
563 mw_count = nt->mw_count;
564 mw_num = QP_TO_MW(nt, qp_num);
565 mw = &nt->mw_vec[mw_num];
567 qp = &nt->qp_vec[qp_num];
571 qp->client_ready = false;
572 qp->event_handler = NULL;
573 ntb_qp_link_down_reset(qp);
575 if (mw_num < nt->qp_count % mw_count)
576 num_qps_mw = nt->qp_count / mw_count + 1;
578 num_qps_mw = nt->qp_count / mw_count;
580 mw_base = mw->phys_addr;
581 mw_size = mw->phys_size;
583 tx_size = mw_size / num_qps_mw;
584 qp_offset = tx_size * (qp_num / mw_count);
586 qp->tx_mw = mw->vbase + qp_offset;
587 KASSERT(qp->tx_mw != NULL, ("uh oh?"));
589 /* XXX Assumes that a vm_paddr_t is equivalent to bus_addr_t */
590 qp->tx_mw_phys = mw_base + qp_offset;
591 KASSERT(qp->tx_mw_phys != 0, ("uh oh?"));
593 tx_size -= sizeof(struct ntb_rx_info);
594 qp->rx_info = (void *)(qp->tx_mw + tx_size);
596 /* Due to house-keeping, there must be at least 2 buffs */
597 qp->tx_max_frame = qmin(transport_mtu, tx_size / 2);
598 qp->tx_max_entry = tx_size / qp->tx_max_frame;
600 callout_init(&qp->link_work, 0);
601 callout_init(&qp->rx_full, 1);
603 mtx_init(&qp->ntb_rx_q_lock, "ntb rx q", NULL, MTX_SPIN);
604 mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN);
605 mtx_init(&qp->tx_lock, "ntb transport tx", NULL, MTX_DEF);
606 TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp);
607 qp->rxc_tq = taskqueue_create("ntbt_rx", M_WAITOK,
608 taskqueue_thread_enqueue, &qp->rxc_tq);
609 taskqueue_start_threads(&qp->rxc_tq, 1, PI_NET, "%s rx%d",
610 device_get_nameunit(nt->dev), qp_num);
612 STAILQ_INIT(&qp->rx_post_q);
613 STAILQ_INIT(&qp->rx_pend_q);
614 STAILQ_INIT(&qp->tx_free_q);
618 ntb_transport_free_queue(struct ntb_transport_qp *qp)
620 struct ntb_transport_ctx *nt = qp->transport;
621 struct ntb_queue_entry *entry;
623 callout_drain(&qp->link_work);
625 ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
626 taskqueue_drain_all(qp->rxc_tq);
627 taskqueue_free(qp->rxc_tq);
630 qp->rx_handler = NULL;
631 qp->tx_handler = NULL;
632 qp->event_handler = NULL;
634 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q)))
635 free(entry, M_NTB_T);
637 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q)))
638 free(entry, M_NTB_T);
640 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
641 free(entry, M_NTB_T);
643 nt->qp_bitmap &= ~(1 << qp->qp_num);
647 * ntb_transport_create_queue - Create a new NTB transport layer queue
648 * @rx_handler: receive callback function
649 * @tx_handler: transmit callback function
650 * @event_handler: event callback function
652 * Create a new NTB transport layer queue and provide the queue with a callback
653 * routine for both transmit and receive. The receive callback routine will be
654 * used to pass up data when the transport has received it on the queue. The
655 * transmit callback routine will be called when the transport has completed the
656 * transmission of the data on the queue and the data is ready to be freed.
658 * RETURNS: pointer to newly created ntb_queue, NULL on error.
660 struct ntb_transport_qp *
661 ntb_transport_create_queue(device_t dev, int q,
662 const struct ntb_queue_handlers *handlers, void *data)
664 struct ntb_transport_child *nc = device_get_ivars(dev);
665 struct ntb_transport_ctx *nt = device_get_softc(device_get_parent(dev));
666 struct ntb_queue_entry *entry;
667 struct ntb_transport_qp *qp;
670 if (q < 0 || q >= nc->qpcnt)
673 qp = &nt->qp_vec[nc->qpoff + q];
674 nt->qp_bitmap |= (1 << qp->qp_num);
676 qp->rx_handler = handlers->rx_handler;
677 qp->tx_handler = handlers->tx_handler;
678 qp->event_handler = handlers->event_handler;
680 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
681 entry = malloc(sizeof(*entry), M_NTB_T, M_WAITOK | M_ZERO);
682 entry->cb_data = data;
684 entry->len = transport_mtu;
686 ntb_list_add(&qp->ntb_rx_q_lock, entry, &qp->rx_pend_q);
689 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
690 entry = malloc(sizeof(*entry), M_NTB_T, M_WAITOK | M_ZERO);
692 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
695 ntb_db_clear(dev, 1ull << qp->qp_num);
700 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue
701 * @qp: NTB transport layer queue to be enabled
703 * Notify NTB transport layer of client readiness to use queue
706 ntb_transport_link_up(struct ntb_transport_qp *qp)
708 struct ntb_transport_ctx *nt = qp->transport;
710 qp->client_ready = true;
712 ntb_printf(2, "qp %d client ready\n", qp->qp_num);
715 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
723 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry
724 * @qp: NTB transport layer queue the entry is to be enqueued on
725 * @cb: per buffer pointer for callback function to use
726 * @data: pointer to data buffer that will be sent
727 * @len: length of the data buffer
729 * Enqueue a new transmit buffer onto the transport queue from which a NTB
730 * payload will be transmitted. This assumes that a lock is being held to
731 * serialize access to the qp.
733 * RETURNS: An appropriate ERRNO error value on error, or zero for success.
736 ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
739 struct ntb_queue_entry *entry;
742 if (!qp->link_is_up || len == 0) {
743 CTR0(KTR_NTB, "TX: link not up");
747 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
749 CTR0(KTR_NTB, "TX: could not get entry from tx_free_q");
753 CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry);
760 mtx_lock(&qp->tx_lock);
761 rc = ntb_process_tx(qp, entry);
762 mtx_unlock(&qp->tx_lock);
764 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
766 "TX: process_tx failed. Returning entry %p to tx_free_q",
773 ntb_tx_copy_callback(void *data)
775 struct ntb_queue_entry *entry = data;
776 struct ntb_transport_qp *qp = entry->qp;
777 struct ntb_payload_header *hdr = entry->x_hdr;
779 iowrite32(entry->flags | NTBT_DESC_DONE_FLAG, &hdr->flags);
780 CTR1(KTR_NTB, "TX: hdr %p set DESC_DONE", hdr);
782 ntb_peer_db_set(qp->dev, 1ull << qp->qp_num);
785 * The entry length can only be zero if the packet is intended to be a
786 * "link down" or similar. Since no payload is being sent in these
787 * cases, there is nothing to add to the completion queue.
789 if (entry->len > 0) {
790 qp->tx_bytes += entry->len;
793 qp->tx_handler(qp, qp->cb_data, entry->buf,
801 "TX: entry %p sent. hdr->ver = %u, hdr->flags = 0x%x, Returning "
802 "to tx_free_q", entry, hdr->ver, hdr->flags);
803 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
807 ntb_memcpy_tx(struct ntb_queue_entry *entry, void *offset)
810 CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset);
811 if (entry->buf != NULL) {
812 m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset);
815 * Ensure that the data is fully copied before setting the
821 ntb_tx_copy_callback(entry);
825 ntb_async_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry)
827 struct ntb_payload_header *hdr;
830 offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
831 hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame -
832 sizeof(struct ntb_payload_header));
835 iowrite32(entry->len, &hdr->len);
836 iowrite32(qp->tx_pkts, &hdr->ver);
838 ntb_memcpy_tx(entry, offset);
842 ntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry)
846 "TX: process_tx: tx_pkts=%lu, tx_index=%u, remote entry=%u",
847 qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry);
848 if (qp->tx_index == qp->remote_rx_info->entry) {
849 CTR0(KTR_NTB, "TX: ring full");
854 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
855 if (qp->tx_handler != NULL)
856 qp->tx_handler(qp, qp->cb_data, entry->buf,
862 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
864 "TX: frame too big. returning entry %p to tx_free_q",
868 CTR2(KTR_NTB, "TX: copying entry %p to index %u", entry, qp->tx_index);
869 ntb_async_tx(qp, entry);
872 qp->tx_index %= qp->tx_max_entry;
881 ntb_transport_rxc_db(void *arg, int pending __unused)
883 struct ntb_transport_qp *qp = arg;
884 uint64_t qp_mask = 1ull << qp->qp_num;
887 CTR0(KTR_NTB, "RX: transport_rx");
889 while ((rc = ntb_process_rxc(qp)) == 0)
891 CTR1(KTR_NTB, "RX: process_rxc returned %d", rc);
893 if ((ntb_db_read(qp->dev) & qp_mask) != 0) {
894 /* If db is set, clear it and check queue once more. */
895 ntb_db_clear(qp->dev, qp_mask);
899 ntb_db_clear_mask(qp->dev, qp_mask);
903 ntb_process_rxc(struct ntb_transport_qp *qp)
905 struct ntb_payload_header *hdr;
906 struct ntb_queue_entry *entry;
909 offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
910 hdr = (void *)(offset + qp->rx_max_frame -
911 sizeof(struct ntb_payload_header));
913 CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index);
914 if ((hdr->flags & NTBT_DESC_DONE_FLAG) == 0) {
915 CTR0(KTR_NTB, "RX: hdr not done");
920 if ((hdr->flags & NTBT_LINK_DOWN_FLAG) != 0) {
921 CTR0(KTR_NTB, "RX: link down");
922 ntb_qp_link_down(qp);
927 if (hdr->ver != (uint32_t)qp->rx_pkts) {
928 CTR2(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). "
929 "Returning entry to rx_pend_q", hdr->ver, qp->rx_pkts);
934 entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q);
937 CTR0(KTR_NTB, "RX: No entries in rx_pend_q");
940 callout_stop(&qp->rx_full);
941 CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry);
944 entry->index = qp->rx_index;
946 if (hdr->len > entry->len) {
947 CTR2(KTR_NTB, "RX: len too long. Wanted %ju got %ju",
948 (uintmax_t)hdr->len, (uintmax_t)entry->len);
952 entry->flags |= NTBT_DESC_DONE_FLAG;
954 ntb_complete_rxc(qp);
956 qp->rx_bytes += hdr->len;
959 CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts);
961 entry->len = hdr->len;
963 ntb_memcpy_rx(qp, entry, offset);
967 qp->rx_index %= qp->rx_max_entry;
972 ntb_memcpy_rx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry,
975 struct ifnet *ifp = entry->cb_data;
976 unsigned int len = entry->len;
978 CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset);
980 entry->buf = (void *)m_devget(offset, len, 0, ifp, NULL);
981 if (entry->buf == NULL)
982 entry->len = -ENOMEM;
984 /* Ensure that the data is globally visible before clearing the flag */
987 CTR2(KTR_NTB, "RX: copied entry %p to mbuf %p.", entry, entry->buf);
988 ntb_rx_copy_callback(qp, entry);
992 ntb_rx_copy_callback(struct ntb_transport_qp *qp, void *data)
994 struct ntb_queue_entry *entry;
997 entry->flags |= NTBT_DESC_DONE_FLAG;
998 ntb_complete_rxc(qp);
1002 ntb_complete_rxc(struct ntb_transport_qp *qp)
1004 struct ntb_queue_entry *entry;
1008 CTR0(KTR_NTB, "RX: rx_completion_task");
1010 mtx_lock_spin(&qp->ntb_rx_q_lock);
1012 while (!STAILQ_EMPTY(&qp->rx_post_q)) {
1013 entry = STAILQ_FIRST(&qp->rx_post_q);
1014 if ((entry->flags & NTBT_DESC_DONE_FLAG) == 0)
1017 entry->x_hdr->flags = 0;
1018 iowrite32(entry->index, &qp->rx_info->entry);
1020 STAILQ_REMOVE_HEAD(&qp->rx_post_q, entry);
1026 * Re-initialize queue_entry for reuse; rx_handler takes
1027 * ownership of the mbuf.
1030 entry->len = transport_mtu;
1031 entry->cb_data = qp->cb_data;
1033 STAILQ_INSERT_TAIL(&qp->rx_pend_q, entry, entry);
1035 mtx_unlock_spin(&qp->ntb_rx_q_lock);
1037 CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m);
1038 if (qp->rx_handler != NULL && qp->client_ready)
1039 qp->rx_handler(qp, qp->cb_data, m, len);
1043 mtx_lock_spin(&qp->ntb_rx_q_lock);
1046 mtx_unlock_spin(&qp->ntb_rx_q_lock);
1050 ntb_transport_doorbell_callback(void *data, uint32_t vector)
1052 struct ntb_transport_ctx *nt = data;
1053 struct ntb_transport_qp *qp;
1057 vec_mask = ntb_db_vector_mask(nt->dev, vector);
1058 vec_mask &= nt->qp_bitmap;
1059 if ((vec_mask & (vec_mask - 1)) != 0)
1060 vec_mask &= ntb_db_read(nt->dev);
1061 if (vec_mask != 0) {
1062 ntb_db_set_mask(nt->dev, vec_mask);
1063 ntb_db_clear(nt->dev, vec_mask);
1065 while (vec_mask != 0) {
1066 qp_num = ffsll(vec_mask) - 1;
1068 qp = &nt->qp_vec[qp_num];
1070 taskqueue_enqueue(qp->rxc_tq, &qp->rxc_db_work);
1072 vec_mask &= ~(1ull << qp_num);
1076 /* Link Event handler */
1078 ntb_transport_event_callback(void *data)
1080 struct ntb_transport_ctx *nt = data;
1082 if (ntb_link_is_up(nt->dev, &nt->link_speed, &nt->link_width)) {
1083 ntb_printf(1, "HW link up\n");
1084 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt);
1086 ntb_printf(1, "HW link down\n");
1087 taskqueue_enqueue(taskqueue_swi, &nt->link_cleanup);
1093 ntb_transport_link_work(void *arg)
1095 struct ntb_transport_ctx *nt = arg;
1096 struct ntb_transport_mw *mw;
1097 device_t dev = nt->dev;
1098 struct ntb_transport_qp *qp;
1099 uint64_t val64, size;
1104 /* send the local info, in the opposite order of the way we read it */
1105 for (i = 0; i < nt->mw_count; i++) {
1106 size = nt->mw_vec[i].phys_size;
1108 if (max_mw_size != 0 && size > max_mw_size)
1111 ntb_peer_spad_write(dev, NTBT_MW0_SZ_HIGH + (i * 2),
1113 ntb_peer_spad_write(dev, NTBT_MW0_SZ_LOW + (i * 2), size);
1115 ntb_peer_spad_write(dev, NTBT_NUM_MWS, nt->mw_count);
1116 ntb_peer_spad_write(dev, NTBT_NUM_QPS, nt->qp_count);
1117 ntb_peer_spad_write(dev, NTBT_QP_LINKS, 0);
1118 ntb_peer_spad_write(dev, NTBT_VERSION, NTB_TRANSPORT_VERSION);
1120 /* Query the remote side for its info */
1122 ntb_spad_read(dev, NTBT_VERSION, &val);
1123 if (val != NTB_TRANSPORT_VERSION)
1126 ntb_spad_read(dev, NTBT_NUM_QPS, &val);
1127 if (val != nt->qp_count)
1130 ntb_spad_read(dev, NTBT_NUM_MWS, &val);
1131 if (val != nt->mw_count)
1134 for (i = 0; i < nt->mw_count; i++) {
1135 ntb_spad_read(dev, NTBT_MW0_SZ_HIGH + (i * 2), &val);
1136 val64 = (uint64_t)val << 32;
1138 ntb_spad_read(dev, NTBT_MW0_SZ_LOW + (i * 2), &val);
1141 mw = &nt->mw_vec[i];
1142 val64 = roundup(val64, mw->xlat_align_size);
1143 if (mw->buff_size != val64) {
1145 rc = ntb_set_mw(nt, i, val64);
1147 ntb_printf(0, "link up set mw%d fails, rc %d\n",
1152 /* Notify HW the memory location of the receive buffer */
1153 rc = ntb_mw_set_trans(nt->dev, i, mw->dma_addr,
1156 ntb_printf(0, "link up mw%d xlat fails, rc %d\n",
1163 nt->link_is_up = true;
1164 ntb_printf(1, "transport link up\n");
1166 for (i = 0; i < nt->qp_count; i++) {
1167 qp = &nt->qp_vec[i];
1169 ntb_transport_setup_qp_mw(nt, i);
1171 if (qp->client_ready)
1172 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
1178 for (i = 0; i < nt->mw_count; i++)
1181 if (ntb_link_is_up(dev, &nt->link_speed, &nt->link_width))
1182 callout_reset(&nt->link_work,
1183 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt);
1186 struct ntb_load_cb_args {
1192 ntb_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
1194 struct ntb_load_cb_args *cba = (struct ntb_load_cb_args *)xsc;
1196 if (!(cba->error = error))
1197 cba->addr = segs[0].ds_addr;
1201 ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, size_t size)
1203 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
1204 struct ntb_load_cb_args cba;
1210 buff_size = roundup(size, mw->xlat_align_size);
1212 /* No need to re-setup */
1213 if (mw->buff_size == buff_size)
1216 if (mw->buff_size != 0)
1217 ntb_free_mw(nt, num_mw);
1219 /* Alloc memory for receiving data. Must be aligned */
1220 mw->buff_size = buff_size;
1222 if (bus_dma_tag_create(bus_get_dma_tag(nt->dev), mw->xlat_align, 0,
1223 mw->addr_limit, BUS_SPACE_MAXADDR,
1224 NULL, NULL, mw->buff_size, 1, mw->buff_size,
1225 0, NULL, NULL, &mw->dma_tag)) {
1226 ntb_printf(0, "Unable to create MW tag of size %zu\n",
1231 if (bus_dmamem_alloc(mw->dma_tag, (void **)&mw->virt_addr,
1232 BUS_DMA_WAITOK | BUS_DMA_ZERO, &mw->dma_map)) {
1233 bus_dma_tag_destroy(mw->dma_tag);
1234 ntb_printf(0, "Unable to allocate MW buffer of size %zu\n",
1239 if (bus_dmamap_load(mw->dma_tag, mw->dma_map, mw->virt_addr,
1240 mw->buff_size, ntb_load_cb, &cba, BUS_DMA_NOWAIT) || cba.error) {
1241 bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
1242 bus_dma_tag_destroy(mw->dma_tag);
1243 ntb_printf(0, "Unable to load MW buffer of size %zu\n",
1248 mw->dma_addr = cba.addr;
1254 ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw)
1256 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
1258 if (mw->virt_addr == NULL)
1261 ntb_mw_clear_trans(nt->dev, num_mw);
1262 bus_dmamap_unload(mw->dma_tag, mw->dma_map);
1263 bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
1264 bus_dma_tag_destroy(mw->dma_tag);
1266 mw->virt_addr = NULL;
1270 ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, unsigned int qp_num)
1272 struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
1273 struct ntb_transport_mw *mw;
1277 unsigned num_qps_mw, mw_num, mw_count;
1279 mw_count = nt->mw_count;
1280 mw_num = QP_TO_MW(nt, qp_num);
1281 mw = &nt->mw_vec[mw_num];
1283 if (mw->virt_addr == NULL)
1286 if (mw_num < nt->qp_count % mw_count)
1287 num_qps_mw = nt->qp_count / mw_count + 1;
1289 num_qps_mw = nt->qp_count / mw_count;
1291 rx_size = mw->buff_size / num_qps_mw;
1292 qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count);
1293 rx_size -= sizeof(struct ntb_rx_info);
1295 qp->remote_rx_info = (void*)(qp->rx_buff + rx_size);
1297 /* Due to house-keeping, there must be at least 2 buffs */
1298 qp->rx_max_frame = qmin(transport_mtu, rx_size / 2);
1299 qp->rx_max_entry = rx_size / qp->rx_max_frame;
1302 qp->remote_rx_info->entry = qp->rx_max_entry - 1;
1304 /* Set up the hdr offsets with 0s */
1305 for (i = 0; i < qp->rx_max_entry; i++) {
1306 offset = (void *)(qp->rx_buff + qp->rx_max_frame * (i + 1) -
1307 sizeof(struct ntb_payload_header));
1308 memset(offset, 0, sizeof(struct ntb_payload_header));
1319 ntb_qp_link_work(void *arg)
1321 struct ntb_transport_qp *qp = arg;
1322 device_t dev = qp->dev;
1323 struct ntb_transport_ctx *nt = qp->transport;
1327 /* Report queues that are up on our side */
1328 for (i = 0, val = 0; i < nt->qp_count; i++) {
1329 if (nt->qp_vec[i].client_ready)
1332 ntb_peer_spad_write(dev, NTBT_QP_LINKS, val);
1334 /* See if the remote side is up */
1335 ntb_spad_read(dev, NTBT_QP_LINKS, &val);
1336 if ((val & (1ull << qp->qp_num)) != 0) {
1337 ntb_printf(2, "qp %d link up\n", qp->qp_num);
1338 qp->link_is_up = true;
1340 if (qp->event_handler != NULL)
1341 qp->event_handler(qp->cb_data, NTB_LINK_UP);
1343 ntb_db_clear_mask(dev, 1ull << qp->qp_num);
1344 } else if (nt->link_is_up)
1345 callout_reset(&qp->link_work,
1346 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp);
1349 /* Link down event*/
1351 ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
1353 struct ntb_transport_qp *qp;
1356 callout_drain(&nt->link_work);
1359 /* Pass along the info to any clients */
1360 for (i = 0; i < nt->qp_count; i++) {
1361 if ((nt->qp_bitmap & (1 << i)) != 0) {
1362 qp = &nt->qp_vec[i];
1363 ntb_qp_link_cleanup(qp);
1364 callout_drain(&qp->link_work);
1369 * The scratchpad registers keep the values if the remote side
1370 * goes down, blast them now to give them a sane value the next
1371 * time they are accessed
1373 ntb_spad_clear(nt->dev);
1377 ntb_transport_link_cleanup_work(void *arg, int pending __unused)
1380 ntb_transport_link_cleanup(arg);
1384 ntb_qp_link_down(struct ntb_transport_qp *qp)
1387 ntb_qp_link_cleanup(qp);
1391 ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
1394 qp->link_is_up = false;
1395 ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
1397 qp->tx_index = qp->rx_index = 0;
1398 qp->tx_bytes = qp->rx_bytes = 0;
1399 qp->tx_pkts = qp->rx_pkts = 0;
1401 qp->rx_ring_empty = 0;
1402 qp->tx_ring_full = 0;
1404 qp->rx_err_no_buf = qp->tx_err_no_buf = 0;
1405 qp->rx_err_oflow = qp->rx_err_ver = 0;
1409 ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
1412 callout_drain(&qp->link_work);
1413 ntb_qp_link_down_reset(qp);
1415 if (qp->event_handler != NULL)
1416 qp->event_handler(qp->cb_data, NTB_LINK_DOWN);
1419 /* Link commanded down */
1421 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data
1422 * @qp: NTB transport layer queue to be disabled
1424 * Notify NTB transport layer of client's desire to no longer receive data on
1425 * transport queue specified. It is the client's responsibility to ensure all
1426 * entries on queue are purged or otherwise handled appropriately.
1429 ntb_transport_link_down(struct ntb_transport_qp *qp)
1431 struct ntb_transport_ctx *nt = qp->transport;
1435 qp->client_ready = false;
1436 for (i = 0, val = 0; i < nt->qp_count; i++) {
1437 if (nt->qp_vec[i].client_ready)
1440 ntb_peer_spad_write(qp->dev, NTBT_QP_LINKS, val);
1443 ntb_send_link_down(qp);
1445 callout_drain(&qp->link_work);
1449 * ntb_transport_link_query - Query transport link state
1450 * @qp: NTB transport layer queue to be queried
1452 * Query connectivity to the remote system of the NTB transport queue
1454 * RETURNS: true for link up or false for link down
1457 ntb_transport_link_query(struct ntb_transport_qp *qp)
1460 return (qp->link_is_up);
1464 * ntb_transport_link_speed - Query transport link speed
1465 * @qp: NTB transport layer queue to be queried
1467 * Query connection speed to the remote system of the NTB transport queue
1469 * RETURNS: link speed in bits per second
1472 ntb_transport_link_speed(struct ntb_transport_qp *qp)
1474 struct ntb_transport_ctx *nt = qp->transport;
1477 if (!nt->link_is_up)
1479 switch (nt->link_speed) {
1480 case NTB_SPEED_GEN1:
1481 rate = 2500000000 * 8 / 10;
1483 case NTB_SPEED_GEN2:
1484 rate = 5000000000 * 8 / 10;
1486 case NTB_SPEED_GEN3:
1487 rate = 8000000000 * 128 / 130;
1489 case NTB_SPEED_GEN4:
1490 rate = 16000000000 * 128 / 130;
1495 if (nt->link_width <= 0)
1497 return (rate * nt->link_width);
1501 ntb_send_link_down(struct ntb_transport_qp *qp)
1503 struct ntb_queue_entry *entry;
1506 if (!qp->link_is_up)
1509 for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) {
1510 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
1513 pause("NTB Wait for link down", hz / 10);
1519 entry->cb_data = NULL;
1522 entry->flags = NTBT_LINK_DOWN_FLAG;
1524 mtx_lock(&qp->tx_lock);
1525 rc = ntb_process_tx(qp, entry);
1526 mtx_unlock(&qp->tx_lock);
1528 printf("ntb: Failed to send link down\n");
1530 ntb_qp_link_down_reset(qp);
1534 /* List Management */
1537 ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry,
1538 struct ntb_queue_list *list)
1541 mtx_lock_spin(lock);
1542 STAILQ_INSERT_TAIL(list, entry, entry);
1543 mtx_unlock_spin(lock);
1546 static struct ntb_queue_entry *
1547 ntb_list_rm(struct mtx *lock, struct ntb_queue_list *list)
1549 struct ntb_queue_entry *entry;
1551 mtx_lock_spin(lock);
1552 if (STAILQ_EMPTY(list)) {
1556 entry = STAILQ_FIRST(list);
1557 STAILQ_REMOVE_HEAD(list, entry);
1559 mtx_unlock_spin(lock);
1564 static struct ntb_queue_entry *
1565 ntb_list_mv(struct mtx *lock, struct ntb_queue_list *from,
1566 struct ntb_queue_list *to)
1568 struct ntb_queue_entry *entry;
1570 mtx_lock_spin(lock);
1571 if (STAILQ_EMPTY(from)) {
1575 entry = STAILQ_FIRST(from);
1576 STAILQ_REMOVE_HEAD(from, entry);
1577 STAILQ_INSERT_TAIL(to, entry, entry);
1580 mtx_unlock_spin(lock);
1585 * ntb_transport_qp_num - Query the qp number
1586 * @qp: NTB transport layer queue to be queried
1588 * Query qp number of the NTB transport queue
1590 * RETURNS: a zero based number specifying the qp number
1592 unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp)
1595 return (qp->qp_num);
1599 * ntb_transport_max_size - Query the max payload size of a qp
1600 * @qp: NTB transport layer queue to be queried
1602 * Query the maximum payload size permissible on the given qp
1604 * RETURNS: the max payload size of a qp
1607 ntb_transport_max_size(struct ntb_transport_qp *qp)
1610 return (qp->tx_max_frame - sizeof(struct ntb_payload_header));
1614 ntb_transport_tx_free_entry(struct ntb_transport_qp *qp)
1616 unsigned int head = qp->tx_index;
1617 unsigned int tail = qp->remote_rx_info->entry;
1619 return (tail >= head ? tail - head : qp->tx_max_entry + tail - head);
1622 static device_method_t ntb_transport_methods[] = {
1623 /* Device interface */
1624 DEVMETHOD(device_probe, ntb_transport_probe),
1625 DEVMETHOD(device_attach, ntb_transport_attach),
1626 DEVMETHOD(device_detach, ntb_transport_detach),
1628 DEVMETHOD(bus_child_location_str, ntb_transport_child_location_str),
1629 DEVMETHOD(bus_print_child, ntb_transport_print_child),
1633 devclass_t ntb_transport_devclass;
1634 static DEFINE_CLASS_0(ntb_transport, ntb_transport_driver,
1635 ntb_transport_methods, sizeof(struct ntb_transport_ctx));
1636 DRIVER_MODULE(ntb_transport, ntb_hw, ntb_transport_driver,
1637 ntb_transport_devclass, NULL, NULL);
1638 MODULE_DEPEND(ntb_transport, ntb, 1, 1, 1);
1639 MODULE_VERSION(ntb_transport, 1);