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 */
184 /* Rx buff is off virt_addr / dma_addr */
185 bus_dma_tag_t dma_tag;
186 bus_dmamap_t dma_map;
191 struct ntb_transport_child {
196 struct ntb_transport_child *next;
199 struct ntb_transport_ctx {
201 struct ntb_transport_child *child;
202 struct ntb_transport_mw *mw_vec;
203 struct ntb_transport_qp *qp_vec;
207 volatile bool link_is_up;
208 enum ntb_speed link_speed;
209 enum ntb_width link_width;
210 struct callout link_work;
211 struct callout link_watchdog;
212 struct task link_cleanup;
216 NTBT_DESC_DONE_FLAG = 1 << 0,
217 NTBT_LINK_DOWN_FLAG = 1 << 1,
220 struct ntb_payload_header {
228 * The order of this enum is part of the remote protocol. Do not
229 * reorder without bumping protocol version (and it's probably best
230 * to keep the protocol in lock-step with the Linux NTB driver.
237 * N.B.: transport_link_work assumes MW1 enums = MW0 + 2.
245 * Some NTB-using hardware have a watchdog to work around NTB hangs; if
246 * a register or doorbell isn't written every few seconds, the link is
247 * torn down. Write an otherwise unused register every few seconds to
248 * work around this watchdog.
250 NTBT_WATCHDOG_SPAD = 15
253 #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count)
254 #define NTB_QP_DEF_NUM_ENTRIES 100
255 #define NTB_LINK_DOWN_TIMEOUT 100
257 static int ntb_transport_probe(device_t dev);
258 static int ntb_transport_attach(device_t dev);
259 static int ntb_transport_detach(device_t dev);
260 static void ntb_transport_init_queue(struct ntb_transport_ctx *nt,
261 unsigned int qp_num);
262 static int ntb_process_tx(struct ntb_transport_qp *qp,
263 struct ntb_queue_entry *entry);
264 static void ntb_transport_rxc_db(void *arg, int pending);
265 static int ntb_process_rxc(struct ntb_transport_qp *qp);
266 static void ntb_memcpy_rx(struct ntb_transport_qp *qp,
267 struct ntb_queue_entry *entry, void *offset);
268 static inline void ntb_rx_copy_callback(struct ntb_transport_qp *qp,
270 static void ntb_complete_rxc(struct ntb_transport_qp *qp);
271 static void ntb_transport_doorbell_callback(void *data, uint32_t vector);
272 static void ntb_transport_event_callback(void *data);
273 static void ntb_transport_link_work(void *arg);
274 static int ntb_set_mw(struct ntb_transport_ctx *, int num_mw, size_t size);
275 static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw);
276 static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt,
277 unsigned int qp_num);
278 static void ntb_qp_link_work(void *arg);
279 static void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt);
280 static void ntb_transport_link_cleanup_work(void *, int);
281 static void ntb_qp_link_down(struct ntb_transport_qp *qp);
282 static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp);
283 static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp);
284 static void ntb_send_link_down(struct ntb_transport_qp *qp);
285 static void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry,
286 struct ntb_queue_list *list);
287 static struct ntb_queue_entry *ntb_list_rm(struct mtx *lock,
288 struct ntb_queue_list *list);
289 static struct ntb_queue_entry *ntb_list_mv(struct mtx *lock,
290 struct ntb_queue_list *from, struct ntb_queue_list *to);
291 static void xeon_link_watchdog_hb(void *);
293 static const struct ntb_ctx_ops ntb_transport_ops = {
294 .link_event = ntb_transport_event_callback,
295 .db_event = ntb_transport_doorbell_callback,
298 MALLOC_DEFINE(M_NTB_T, "ntb_transport", "ntb transport driver");
301 iowrite32(uint32_t val, void *addr)
304 bus_space_write_4(X86_BUS_SPACE_MEM, 0/* HACK */, (uintptr_t)addr,
308 /* Transport Init and teardown */
311 xeon_link_watchdog_hb(void *arg)
313 struct ntb_transport_ctx *nt;
316 ntb_spad_write(nt->dev, NTBT_WATCHDOG_SPAD, 0);
317 callout_reset(&nt->link_watchdog, 1 * hz, xeon_link_watchdog_hb, nt);
321 ntb_transport_probe(device_t dev)
324 device_set_desc(dev, "NTB Transport");
329 ntb_transport_attach(device_t dev)
331 struct ntb_transport_ctx *nt = device_get_softc(dev);
332 struct ntb_transport_child **cpp = &nt->child;
333 struct ntb_transport_child *nc;
334 struct ntb_transport_mw *mw;
335 uint64_t db_bitmap, size;
336 int rc, i, db_count, spad_count, qp, qpu, qpo, qpt;
339 char *n, *np, *c, *name;
342 nt->mw_count = ntb_mw_count(dev);
343 spad_count = ntb_spad_count(dev);
344 db_bitmap = ntb_db_valid_mask(dev);
345 db_count = flsll(db_bitmap);
346 KASSERT(db_bitmap == (1 << db_count) - 1,
347 ("Doorbells are not sequential (%jx).\n", db_bitmap));
349 if (nt->mw_count == 0) {
350 device_printf(dev, "At least 1 memory window required.\n");
353 if (spad_count < 6) {
354 device_printf(dev, "At least 6 scratchpads required.\n");
357 if (spad_count < 4 + 2 * nt->mw_count) {
358 nt->mw_count = (spad_count - 4) / 2;
359 device_printf(dev, "Scratchpads enough only for %d "
360 "memory windows.\n", nt->mw_count);
362 if (db_bitmap == 0) {
363 device_printf(dev, "At least one doorbell required.\n");
367 nt->mw_vec = malloc(nt->mw_count * sizeof(*nt->mw_vec), M_NTB_T,
369 for (i = 0; i < nt->mw_count; i++) {
372 rc = ntb_mw_get_range(dev, i, &mw->phys_addr, &mw->vbase,
373 &mw->phys_size, &mw->xlat_align, &mw->xlat_align_size,
380 mw->virt_addr = NULL;
383 rc = ntb_mw_set_wc(dev, i, VM_MEMATTR_WRITE_COMBINING);
385 ntb_printf(0, "Unable to set mw%d caching\n", i);
388 * Try to preallocate receive memory early, since there may
389 * be not enough contiguous memory later. It is quite likely
390 * that NTB windows are symmetric and this allocation remain,
391 * but even if not, we will just reallocate it later.
393 size = mw->phys_size;
394 if (max_mw_size != 0 && size > max_mw_size)
396 ntb_set_mw(nt, i, size);
400 qpo = imin(db_count, nt->mw_count);
403 snprintf(buf, sizeof(buf), "hint.%s.%d.config", device_get_name(dev),
404 device_get_unit(dev));
405 TUNABLE_STR_FETCH(buf, cfg, sizeof(cfg));
408 while ((c = strsep(&n, ",")) != NULL) {
410 name = strsep(&np, ":");
411 if (name != NULL && name[0] == 0)
413 qp = (np && np[0] != 0) ? strtol(np, NULL, 10) : qpo - qpu;
417 if (qp > qpt - qpu) {
418 device_printf(dev, "Not enough resources for config\n");
422 nc = malloc(sizeof(*nc), M_DEVBUF, M_WAITOK | M_ZERO);
426 nc->dev = device_add_child(dev, name, -1);
427 if (nc->dev == NULL) {
428 device_printf(dev, "Can not add child.\n");
431 device_set_ivars(nc->dev, nc);
436 device_printf(dev, "%d \"%s\": queues %d",
439 printf("-%d", qpu + qp - 1);
448 nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_T,
451 for (i = 0; i < nt->qp_count; i++)
452 ntb_transport_init_queue(nt, i);
454 callout_init(&nt->link_work, 0);
455 callout_init(&nt->link_watchdog, 0);
456 TASK_INIT(&nt->link_cleanup, 0, ntb_transport_link_cleanup_work, nt);
457 nt->link_is_up = false;
459 rc = ntb_set_ctx(dev, nt, &ntb_transport_ops);
463 ntb_link_enable(dev, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
465 if (enable_xeon_watchdog != 0)
466 callout_reset(&nt->link_watchdog, 0, xeon_link_watchdog_hb, nt);
468 bus_generic_attach(dev);
472 free(nt->qp_vec, M_NTB_T);
473 free(nt->mw_vec, M_NTB_T);
478 ntb_transport_detach(device_t dev)
480 struct ntb_transport_ctx *nt = device_get_softc(dev);
481 struct ntb_transport_child **cpp = &nt->child;
482 struct ntb_transport_child *nc;
485 while ((nc = *cpp) != NULL) {
487 error = device_delete_child(dev, nc->dev);
492 KASSERT(nt->qp_bitmap == 0,
493 ("Some queues not freed on detach (%jx)", nt->qp_bitmap));
495 ntb_transport_link_cleanup(nt);
496 taskqueue_drain(taskqueue_swi, &nt->link_cleanup);
497 callout_drain(&nt->link_work);
498 callout_drain(&nt->link_watchdog);
500 ntb_link_disable(dev);
503 for (i = 0; i < nt->mw_count; i++)
506 free(nt->qp_vec, M_NTB_T);
507 free(nt->mw_vec, M_NTB_T);
512 ntb_transport_print_child(device_t dev, device_t child)
514 struct ntb_transport_child *nc = device_get_ivars(child);
517 retval = bus_print_child_header(dev, child);
519 printf(" queue %d", nc->qpoff);
521 printf("-%d", nc->qpoff + nc->qpcnt - 1);
523 retval += printf(" at consumer %d", nc->consumer);
524 retval += bus_print_child_domain(dev, child);
525 retval += bus_print_child_footer(dev, child);
531 ntb_transport_child_location_str(device_t dev, device_t child, char *buf,
534 struct ntb_transport_child *nc = device_get_ivars(child);
536 snprintf(buf, buflen, "consumer=%d", nc->consumer);
541 ntb_transport_queue_count(device_t dev)
543 struct ntb_transport_child *nc = device_get_ivars(dev);
549 ntb_transport_init_queue(struct ntb_transport_ctx *nt, unsigned int qp_num)
551 struct ntb_transport_mw *mw;
552 struct ntb_transport_qp *qp;
554 uint64_t mw_size, qp_offset;
556 unsigned num_qps_mw, mw_num, mw_count;
558 mw_count = nt->mw_count;
559 mw_num = QP_TO_MW(nt, qp_num);
560 mw = &nt->mw_vec[mw_num];
562 qp = &nt->qp_vec[qp_num];
566 qp->client_ready = false;
567 qp->event_handler = NULL;
568 ntb_qp_link_down_reset(qp);
570 if (mw_num < nt->qp_count % mw_count)
571 num_qps_mw = nt->qp_count / mw_count + 1;
573 num_qps_mw = nt->qp_count / mw_count;
575 mw_base = mw->phys_addr;
576 mw_size = mw->phys_size;
578 tx_size = mw_size / num_qps_mw;
579 qp_offset = tx_size * (qp_num / mw_count);
581 qp->tx_mw = mw->vbase + qp_offset;
582 KASSERT(qp->tx_mw != NULL, ("uh oh?"));
584 /* XXX Assumes that a vm_paddr_t is equivalent to bus_addr_t */
585 qp->tx_mw_phys = mw_base + qp_offset;
586 KASSERT(qp->tx_mw_phys != 0, ("uh oh?"));
588 tx_size -= sizeof(struct ntb_rx_info);
589 qp->rx_info = (void *)(qp->tx_mw + tx_size);
591 /* Due to house-keeping, there must be at least 2 buffs */
592 qp->tx_max_frame = qmin(transport_mtu, tx_size / 2);
593 qp->tx_max_entry = tx_size / qp->tx_max_frame;
595 callout_init(&qp->link_work, 0);
596 callout_init(&qp->rx_full, 1);
598 mtx_init(&qp->ntb_rx_q_lock, "ntb rx q", NULL, MTX_SPIN);
599 mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN);
600 mtx_init(&qp->tx_lock, "ntb transport tx", NULL, MTX_DEF);
601 TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp);
602 qp->rxc_tq = taskqueue_create("ntbt_rx", M_WAITOK,
603 taskqueue_thread_enqueue, &qp->rxc_tq);
604 taskqueue_start_threads(&qp->rxc_tq, 1, PI_NET, "%s rx%d",
605 device_get_nameunit(nt->dev), qp_num);
607 STAILQ_INIT(&qp->rx_post_q);
608 STAILQ_INIT(&qp->rx_pend_q);
609 STAILQ_INIT(&qp->tx_free_q);
613 ntb_transport_free_queue(struct ntb_transport_qp *qp)
615 struct ntb_transport_ctx *nt = qp->transport;
616 struct ntb_queue_entry *entry;
618 callout_drain(&qp->link_work);
620 ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
621 taskqueue_drain_all(qp->rxc_tq);
622 taskqueue_free(qp->rxc_tq);
625 qp->rx_handler = NULL;
626 qp->tx_handler = NULL;
627 qp->event_handler = NULL;
629 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q)))
630 free(entry, M_NTB_T);
632 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q)))
633 free(entry, M_NTB_T);
635 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
636 free(entry, M_NTB_T);
638 nt->qp_bitmap &= ~(1 << qp->qp_num);
642 * ntb_transport_create_queue - Create a new NTB transport layer queue
643 * @rx_handler: receive callback function
644 * @tx_handler: transmit callback function
645 * @event_handler: event callback function
647 * Create a new NTB transport layer queue and provide the queue with a callback
648 * routine for both transmit and receive. The receive callback routine will be
649 * used to pass up data when the transport has received it on the queue. The
650 * transmit callback routine will be called when the transport has completed the
651 * transmission of the data on the queue and the data is ready to be freed.
653 * RETURNS: pointer to newly created ntb_queue, NULL on error.
655 struct ntb_transport_qp *
656 ntb_transport_create_queue(device_t dev, int q,
657 const struct ntb_queue_handlers *handlers, void *data)
659 struct ntb_transport_child *nc = device_get_ivars(dev);
660 struct ntb_transport_ctx *nt = device_get_softc(device_get_parent(dev));
661 struct ntb_queue_entry *entry;
662 struct ntb_transport_qp *qp;
665 if (q < 0 || q >= nc->qpcnt)
668 qp = &nt->qp_vec[nc->qpoff + q];
669 nt->qp_bitmap |= (1 << qp->qp_num);
671 qp->rx_handler = handlers->rx_handler;
672 qp->tx_handler = handlers->tx_handler;
673 qp->event_handler = handlers->event_handler;
675 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
676 entry = malloc(sizeof(*entry), M_NTB_T, M_WAITOK | M_ZERO);
677 entry->cb_data = data;
679 entry->len = transport_mtu;
681 ntb_list_add(&qp->ntb_rx_q_lock, entry, &qp->rx_pend_q);
684 for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) {
685 entry = malloc(sizeof(*entry), M_NTB_T, M_WAITOK | M_ZERO);
687 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
690 ntb_db_clear(dev, 1ull << qp->qp_num);
695 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue
696 * @qp: NTB transport layer queue to be enabled
698 * Notify NTB transport layer of client readiness to use queue
701 ntb_transport_link_up(struct ntb_transport_qp *qp)
703 struct ntb_transport_ctx *nt = qp->transport;
705 qp->client_ready = true;
707 ntb_printf(2, "qp %d client ready\n", qp->qp_num);
710 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
718 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry
719 * @qp: NTB transport layer queue the entry is to be enqueued on
720 * @cb: per buffer pointer for callback function to use
721 * @data: pointer to data buffer that will be sent
722 * @len: length of the data buffer
724 * Enqueue a new transmit buffer onto the transport queue from which a NTB
725 * payload will be transmitted. This assumes that a lock is being held to
726 * serialize access to the qp.
728 * RETURNS: An appropriate ERRNO error value on error, or zero for success.
731 ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
734 struct ntb_queue_entry *entry;
737 if (!qp->link_is_up || len == 0) {
738 CTR0(KTR_NTB, "TX: link not up");
742 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
744 CTR0(KTR_NTB, "TX: could not get entry from tx_free_q");
748 CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry);
755 mtx_lock(&qp->tx_lock);
756 rc = ntb_process_tx(qp, entry);
757 mtx_unlock(&qp->tx_lock);
759 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
761 "TX: process_tx failed. Returning entry %p to tx_free_q",
768 ntb_tx_copy_callback(void *data)
770 struct ntb_queue_entry *entry = data;
771 struct ntb_transport_qp *qp = entry->qp;
772 struct ntb_payload_header *hdr = entry->x_hdr;
774 iowrite32(entry->flags | NTBT_DESC_DONE_FLAG, &hdr->flags);
775 CTR1(KTR_NTB, "TX: hdr %p set DESC_DONE", hdr);
777 ntb_peer_db_set(qp->dev, 1ull << qp->qp_num);
780 * The entry length can only be zero if the packet is intended to be a
781 * "link down" or similar. Since no payload is being sent in these
782 * cases, there is nothing to add to the completion queue.
784 if (entry->len > 0) {
785 qp->tx_bytes += entry->len;
788 qp->tx_handler(qp, qp->cb_data, entry->buf,
796 "TX: entry %p sent. hdr->ver = %u, hdr->flags = 0x%x, Returning "
797 "to tx_free_q", entry, hdr->ver, hdr->flags);
798 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
802 ntb_memcpy_tx(struct ntb_queue_entry *entry, void *offset)
805 CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset);
806 if (entry->buf != NULL) {
807 m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset);
810 * Ensure that the data is fully copied before setting the
816 ntb_tx_copy_callback(entry);
820 ntb_async_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry)
822 struct ntb_payload_header *hdr;
825 offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
826 hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame -
827 sizeof(struct ntb_payload_header));
830 iowrite32(entry->len, &hdr->len);
831 iowrite32(qp->tx_pkts, &hdr->ver);
833 ntb_memcpy_tx(entry, offset);
837 ntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry)
841 "TX: process_tx: tx_pkts=%lu, tx_index=%u, remote entry=%u",
842 qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry);
843 if (qp->tx_index == qp->remote_rx_info->entry) {
844 CTR0(KTR_NTB, "TX: ring full");
849 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
850 if (qp->tx_handler != NULL)
851 qp->tx_handler(qp, qp->cb_data, entry->buf,
857 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
859 "TX: frame too big. returning entry %p to tx_free_q",
863 CTR2(KTR_NTB, "TX: copying entry %p to index %u", entry, qp->tx_index);
864 ntb_async_tx(qp, entry);
867 qp->tx_index %= qp->tx_max_entry;
876 ntb_transport_rxc_db(void *arg, int pending __unused)
878 struct ntb_transport_qp *qp = arg;
879 uint64_t qp_mask = 1ull << qp->qp_num;
882 CTR0(KTR_NTB, "RX: transport_rx");
884 while ((rc = ntb_process_rxc(qp)) == 0)
886 CTR1(KTR_NTB, "RX: process_rxc returned %d", rc);
888 if ((ntb_db_read(qp->dev) & qp_mask) != 0) {
889 /* If db is set, clear it and check queue once more. */
890 ntb_db_clear(qp->dev, qp_mask);
894 ntb_db_clear_mask(qp->dev, qp_mask);
898 ntb_process_rxc(struct ntb_transport_qp *qp)
900 struct ntb_payload_header *hdr;
901 struct ntb_queue_entry *entry;
904 offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
905 hdr = (void *)(offset + qp->rx_max_frame -
906 sizeof(struct ntb_payload_header));
908 CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index);
909 if ((hdr->flags & NTBT_DESC_DONE_FLAG) == 0) {
910 CTR0(KTR_NTB, "RX: hdr not done");
915 if ((hdr->flags & NTBT_LINK_DOWN_FLAG) != 0) {
916 CTR0(KTR_NTB, "RX: link down");
917 ntb_qp_link_down(qp);
922 if (hdr->ver != (uint32_t)qp->rx_pkts) {
923 CTR2(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). "
924 "Returning entry to rx_pend_q", hdr->ver, qp->rx_pkts);
929 entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q);
932 CTR0(KTR_NTB, "RX: No entries in rx_pend_q");
935 callout_stop(&qp->rx_full);
936 CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry);
939 entry->index = qp->rx_index;
941 if (hdr->len > entry->len) {
942 CTR2(KTR_NTB, "RX: len too long. Wanted %ju got %ju",
943 (uintmax_t)hdr->len, (uintmax_t)entry->len);
947 entry->flags |= NTBT_DESC_DONE_FLAG;
949 ntb_complete_rxc(qp);
951 qp->rx_bytes += hdr->len;
954 CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts);
956 entry->len = hdr->len;
958 ntb_memcpy_rx(qp, entry, offset);
962 qp->rx_index %= qp->rx_max_entry;
967 ntb_memcpy_rx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry,
970 struct ifnet *ifp = entry->cb_data;
971 unsigned int len = entry->len;
973 CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset);
975 entry->buf = (void *)m_devget(offset, len, 0, ifp, NULL);
976 if (entry->buf == NULL)
977 entry->len = -ENOMEM;
979 /* Ensure that the data is globally visible before clearing the flag */
982 CTR2(KTR_NTB, "RX: copied entry %p to mbuf %p.", entry, entry->buf);
983 ntb_rx_copy_callback(qp, entry);
987 ntb_rx_copy_callback(struct ntb_transport_qp *qp, void *data)
989 struct ntb_queue_entry *entry;
992 entry->flags |= NTBT_DESC_DONE_FLAG;
993 ntb_complete_rxc(qp);
997 ntb_complete_rxc(struct ntb_transport_qp *qp)
999 struct ntb_queue_entry *entry;
1003 CTR0(KTR_NTB, "RX: rx_completion_task");
1005 mtx_lock_spin(&qp->ntb_rx_q_lock);
1007 while (!STAILQ_EMPTY(&qp->rx_post_q)) {
1008 entry = STAILQ_FIRST(&qp->rx_post_q);
1009 if ((entry->flags & NTBT_DESC_DONE_FLAG) == 0)
1012 entry->x_hdr->flags = 0;
1013 iowrite32(entry->index, &qp->rx_info->entry);
1015 STAILQ_REMOVE_HEAD(&qp->rx_post_q, entry);
1021 * Re-initialize queue_entry for reuse; rx_handler takes
1022 * ownership of the mbuf.
1025 entry->len = transport_mtu;
1026 entry->cb_data = qp->cb_data;
1028 STAILQ_INSERT_TAIL(&qp->rx_pend_q, entry, entry);
1030 mtx_unlock_spin(&qp->ntb_rx_q_lock);
1032 CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m);
1033 if (qp->rx_handler != NULL && qp->client_ready)
1034 qp->rx_handler(qp, qp->cb_data, m, len);
1038 mtx_lock_spin(&qp->ntb_rx_q_lock);
1041 mtx_unlock_spin(&qp->ntb_rx_q_lock);
1045 ntb_transport_doorbell_callback(void *data, uint32_t vector)
1047 struct ntb_transport_ctx *nt = data;
1048 struct ntb_transport_qp *qp;
1052 vec_mask = ntb_db_vector_mask(nt->dev, vector);
1053 vec_mask &= nt->qp_bitmap;
1054 if ((vec_mask & (vec_mask - 1)) != 0)
1055 vec_mask &= ntb_db_read(nt->dev);
1056 if (vec_mask != 0) {
1057 ntb_db_set_mask(nt->dev, vec_mask);
1058 ntb_db_clear(nt->dev, vec_mask);
1060 while (vec_mask != 0) {
1061 qp_num = ffsll(vec_mask) - 1;
1063 qp = &nt->qp_vec[qp_num];
1065 taskqueue_enqueue(qp->rxc_tq, &qp->rxc_db_work);
1067 vec_mask &= ~(1ull << qp_num);
1071 /* Link Event handler */
1073 ntb_transport_event_callback(void *data)
1075 struct ntb_transport_ctx *nt = data;
1077 if (ntb_link_is_up(nt->dev, &nt->link_speed, &nt->link_width)) {
1078 ntb_printf(1, "HW link up\n");
1079 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt);
1081 ntb_printf(1, "HW link down\n");
1082 taskqueue_enqueue(taskqueue_swi, &nt->link_cleanup);
1088 ntb_transport_link_work(void *arg)
1090 struct ntb_transport_ctx *nt = arg;
1091 device_t dev = nt->dev;
1092 struct ntb_transport_qp *qp;
1093 uint64_t val64, size;
1098 /* send the local info, in the opposite order of the way we read it */
1099 for (i = 0; i < nt->mw_count; i++) {
1100 size = nt->mw_vec[i].phys_size;
1102 if (max_mw_size != 0 && size > max_mw_size)
1105 ntb_peer_spad_write(dev, NTBT_MW0_SZ_HIGH + (i * 2),
1107 ntb_peer_spad_write(dev, NTBT_MW0_SZ_LOW + (i * 2), size);
1109 ntb_peer_spad_write(dev, NTBT_NUM_MWS, nt->mw_count);
1110 ntb_peer_spad_write(dev, NTBT_NUM_QPS, nt->qp_count);
1111 ntb_peer_spad_write(dev, NTBT_QP_LINKS, 0);
1112 ntb_peer_spad_write(dev, NTBT_VERSION, NTB_TRANSPORT_VERSION);
1114 /* Query the remote side for its info */
1116 ntb_spad_read(dev, NTBT_VERSION, &val);
1117 if (val != NTB_TRANSPORT_VERSION)
1120 ntb_spad_read(dev, NTBT_NUM_QPS, &val);
1121 if (val != nt->qp_count)
1124 ntb_spad_read(dev, NTBT_NUM_MWS, &val);
1125 if (val != nt->mw_count)
1128 for (i = 0; i < nt->mw_count; i++) {
1129 ntb_spad_read(dev, NTBT_MW0_SZ_HIGH + (i * 2), &val);
1130 val64 = (uint64_t)val << 32;
1132 ntb_spad_read(dev, NTBT_MW0_SZ_LOW + (i * 2), &val);
1135 rc = ntb_set_mw(nt, i, val64);
1140 nt->link_is_up = true;
1141 ntb_printf(1, "transport link up\n");
1143 for (i = 0; i < nt->qp_count; i++) {
1144 qp = &nt->qp_vec[i];
1146 ntb_transport_setup_qp_mw(nt, i);
1148 if (qp->client_ready)
1149 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
1155 for (i = 0; i < nt->mw_count; i++)
1158 if (ntb_link_is_up(dev, &nt->link_speed, &nt->link_width))
1159 callout_reset(&nt->link_work,
1160 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt);
1163 struct ntb_load_cb_args {
1169 ntb_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
1171 struct ntb_load_cb_args *cba = (struct ntb_load_cb_args *)xsc;
1173 if (!(cba->error = error))
1174 cba->addr = segs[0].ds_addr;
1178 ntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, size_t size)
1180 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
1181 struct ntb_load_cb_args cba;
1182 size_t xlat_size, buff_size;
1188 xlat_size = roundup(size, mw->xlat_align_size);
1189 buff_size = xlat_size;
1191 /* No need to re-setup */
1192 if (mw->xlat_size == xlat_size)
1195 if (mw->buff_size != 0)
1196 ntb_free_mw(nt, num_mw);
1198 /* Alloc memory for receiving data. Must be aligned */
1199 mw->xlat_size = xlat_size;
1200 mw->buff_size = buff_size;
1202 if (bus_dma_tag_create(bus_get_dma_tag(nt->dev), mw->xlat_align, 0,
1203 mw->addr_limit, BUS_SPACE_MAXADDR,
1204 NULL, NULL, mw->buff_size, 1, mw->buff_size,
1205 0, NULL, NULL, &mw->dma_tag)) {
1206 ntb_printf(0, "Unable to create MW tag of size %zu/%zu\n",
1207 mw->buff_size, mw->xlat_size);
1212 if (bus_dmamem_alloc(mw->dma_tag, (void **)&mw->virt_addr,
1213 BUS_DMA_WAITOK | BUS_DMA_ZERO, &mw->dma_map)) {
1214 bus_dma_tag_destroy(mw->dma_tag);
1215 ntb_printf(0, "Unable to allocate MW buffer of size %zu/%zu\n",
1216 mw->buff_size, mw->xlat_size);
1221 if (bus_dmamap_load(mw->dma_tag, mw->dma_map, mw->virt_addr,
1222 mw->buff_size, ntb_load_cb, &cba, BUS_DMA_NOWAIT) || cba.error) {
1223 bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
1224 bus_dma_tag_destroy(mw->dma_tag);
1225 ntb_printf(0, "Unable to load MW buffer of size %zu/%zu\n",
1226 mw->buff_size, mw->xlat_size);
1231 mw->dma_addr = cba.addr;
1233 /* Notify HW the memory location of the receive buffer */
1234 rc = ntb_mw_set_trans(nt->dev, num_mw, mw->dma_addr, mw->xlat_size);
1236 ntb_printf(0, "Unable to set mw%d translation\n", num_mw);
1237 ntb_free_mw(nt, num_mw);
1245 ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw)
1247 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
1249 if (mw->virt_addr == NULL)
1252 ntb_mw_clear_trans(nt->dev, num_mw);
1253 bus_dmamap_unload(mw->dma_tag, mw->dma_map);
1254 bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
1255 bus_dma_tag_destroy(mw->dma_tag);
1258 mw->virt_addr = NULL;
1262 ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, unsigned int qp_num)
1264 struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
1265 struct ntb_transport_mw *mw;
1269 unsigned num_qps_mw, mw_num, mw_count;
1271 mw_count = nt->mw_count;
1272 mw_num = QP_TO_MW(nt, qp_num);
1273 mw = &nt->mw_vec[mw_num];
1275 if (mw->virt_addr == NULL)
1278 if (mw_num < nt->qp_count % mw_count)
1279 num_qps_mw = nt->qp_count / mw_count + 1;
1281 num_qps_mw = nt->qp_count / mw_count;
1283 rx_size = mw->xlat_size / num_qps_mw;
1284 qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count);
1285 rx_size -= sizeof(struct ntb_rx_info);
1287 qp->remote_rx_info = (void*)(qp->rx_buff + rx_size);
1289 /* Due to house-keeping, there must be at least 2 buffs */
1290 qp->rx_max_frame = qmin(transport_mtu, rx_size / 2);
1291 qp->rx_max_entry = rx_size / qp->rx_max_frame;
1294 qp->remote_rx_info->entry = qp->rx_max_entry - 1;
1296 /* Set up the hdr offsets with 0s */
1297 for (i = 0; i < qp->rx_max_entry; i++) {
1298 offset = (void *)(qp->rx_buff + qp->rx_max_frame * (i + 1) -
1299 sizeof(struct ntb_payload_header));
1300 memset(offset, 0, sizeof(struct ntb_payload_header));
1311 ntb_qp_link_work(void *arg)
1313 struct ntb_transport_qp *qp = arg;
1314 device_t dev = qp->dev;
1315 struct ntb_transport_ctx *nt = qp->transport;
1319 /* Report queues that are up on our side */
1320 for (i = 0, val = 0; i < nt->qp_count; i++) {
1321 if (nt->qp_vec[i].client_ready)
1324 ntb_peer_spad_write(dev, NTBT_QP_LINKS, val);
1326 /* See if the remote side is up */
1327 ntb_spad_read(dev, NTBT_QP_LINKS, &val);
1328 if ((val & (1ull << qp->qp_num)) != 0) {
1329 ntb_printf(2, "qp %d link up\n", qp->qp_num);
1330 qp->link_is_up = true;
1332 if (qp->event_handler != NULL)
1333 qp->event_handler(qp->cb_data, NTB_LINK_UP);
1335 ntb_db_clear_mask(dev, 1ull << qp->qp_num);
1336 } else if (nt->link_is_up)
1337 callout_reset(&qp->link_work,
1338 NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp);
1341 /* Link down event*/
1343 ntb_transport_link_cleanup(struct ntb_transport_ctx *nt)
1345 struct ntb_transport_qp *qp;
1348 callout_drain(&nt->link_work);
1351 /* Pass along the info to any clients */
1352 for (i = 0; i < nt->qp_count; i++) {
1353 if ((nt->qp_bitmap & (1 << i)) != 0) {
1354 qp = &nt->qp_vec[i];
1355 ntb_qp_link_cleanup(qp);
1356 callout_drain(&qp->link_work);
1361 * The scratchpad registers keep the values if the remote side
1362 * goes down, blast them now to give them a sane value the next
1363 * time they are accessed
1365 ntb_spad_clear(nt->dev);
1369 ntb_transport_link_cleanup_work(void *arg, int pending __unused)
1372 ntb_transport_link_cleanup(arg);
1376 ntb_qp_link_down(struct ntb_transport_qp *qp)
1379 ntb_qp_link_cleanup(qp);
1383 ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
1386 qp->link_is_up = false;
1387 ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
1389 qp->tx_index = qp->rx_index = 0;
1390 qp->tx_bytes = qp->rx_bytes = 0;
1391 qp->tx_pkts = qp->rx_pkts = 0;
1393 qp->rx_ring_empty = 0;
1394 qp->tx_ring_full = 0;
1396 qp->rx_err_no_buf = qp->tx_err_no_buf = 0;
1397 qp->rx_err_oflow = qp->rx_err_ver = 0;
1401 ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
1404 callout_drain(&qp->link_work);
1405 ntb_qp_link_down_reset(qp);
1407 if (qp->event_handler != NULL)
1408 qp->event_handler(qp->cb_data, NTB_LINK_DOWN);
1411 /* Link commanded down */
1413 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data
1414 * @qp: NTB transport layer queue to be disabled
1416 * Notify NTB transport layer of client's desire to no longer receive data on
1417 * transport queue specified. It is the client's responsibility to ensure all
1418 * entries on queue are purged or otherwise handled appropriately.
1421 ntb_transport_link_down(struct ntb_transport_qp *qp)
1423 struct ntb_transport_ctx *nt = qp->transport;
1427 qp->client_ready = false;
1428 for (i = 0, val = 0; i < nt->qp_count; i++) {
1429 if (nt->qp_vec[i].client_ready)
1432 ntb_peer_spad_write(qp->dev, NTBT_QP_LINKS, val);
1435 ntb_send_link_down(qp);
1437 callout_drain(&qp->link_work);
1441 * ntb_transport_link_query - Query transport link state
1442 * @qp: NTB transport layer queue to be queried
1444 * Query connectivity to the remote system of the NTB transport queue
1446 * RETURNS: true for link up or false for link down
1449 ntb_transport_link_query(struct ntb_transport_qp *qp)
1452 return (qp->link_is_up);
1456 * ntb_transport_link_speed - Query transport link speed
1457 * @qp: NTB transport layer queue to be queried
1459 * Query connection speed to the remote system of the NTB transport queue
1461 * RETURNS: link speed in bits per second
1464 ntb_transport_link_speed(struct ntb_transport_qp *qp)
1466 struct ntb_transport_ctx *nt = qp->transport;
1469 if (!nt->link_is_up)
1471 switch (nt->link_speed) {
1472 case NTB_SPEED_GEN1:
1473 rate = 2500000000 * 8 / 10;
1475 case NTB_SPEED_GEN2:
1476 rate = 5000000000 * 8 / 10;
1478 case NTB_SPEED_GEN3:
1479 rate = 8000000000 * 128 / 130;
1481 case NTB_SPEED_GEN4:
1482 rate = 16000000000 * 128 / 130;
1487 if (nt->link_width <= 0)
1489 return (rate * nt->link_width);
1493 ntb_send_link_down(struct ntb_transport_qp *qp)
1495 struct ntb_queue_entry *entry;
1498 if (!qp->link_is_up)
1501 for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) {
1502 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
1505 pause("NTB Wait for link down", hz / 10);
1511 entry->cb_data = NULL;
1514 entry->flags = NTBT_LINK_DOWN_FLAG;
1516 mtx_lock(&qp->tx_lock);
1517 rc = ntb_process_tx(qp, entry);
1518 mtx_unlock(&qp->tx_lock);
1520 printf("ntb: Failed to send link down\n");
1522 ntb_qp_link_down_reset(qp);
1526 /* List Management */
1529 ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry,
1530 struct ntb_queue_list *list)
1533 mtx_lock_spin(lock);
1534 STAILQ_INSERT_TAIL(list, entry, entry);
1535 mtx_unlock_spin(lock);
1538 static struct ntb_queue_entry *
1539 ntb_list_rm(struct mtx *lock, struct ntb_queue_list *list)
1541 struct ntb_queue_entry *entry;
1543 mtx_lock_spin(lock);
1544 if (STAILQ_EMPTY(list)) {
1548 entry = STAILQ_FIRST(list);
1549 STAILQ_REMOVE_HEAD(list, entry);
1551 mtx_unlock_spin(lock);
1556 static struct ntb_queue_entry *
1557 ntb_list_mv(struct mtx *lock, struct ntb_queue_list *from,
1558 struct ntb_queue_list *to)
1560 struct ntb_queue_entry *entry;
1562 mtx_lock_spin(lock);
1563 if (STAILQ_EMPTY(from)) {
1567 entry = STAILQ_FIRST(from);
1568 STAILQ_REMOVE_HEAD(from, entry);
1569 STAILQ_INSERT_TAIL(to, entry, entry);
1572 mtx_unlock_spin(lock);
1577 * ntb_transport_qp_num - Query the qp number
1578 * @qp: NTB transport layer queue to be queried
1580 * Query qp number of the NTB transport queue
1582 * RETURNS: a zero based number specifying the qp number
1584 unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp)
1587 return (qp->qp_num);
1591 * ntb_transport_max_size - Query the max payload size of a qp
1592 * @qp: NTB transport layer queue to be queried
1594 * Query the maximum payload size permissible on the given qp
1596 * RETURNS: the max payload size of a qp
1599 ntb_transport_max_size(struct ntb_transport_qp *qp)
1602 return (qp->tx_max_frame - sizeof(struct ntb_payload_header));
1606 ntb_transport_tx_free_entry(struct ntb_transport_qp *qp)
1608 unsigned int head = qp->tx_index;
1609 unsigned int tail = qp->remote_rx_info->entry;
1611 return (tail >= head ? tail - head : qp->tx_max_entry + tail - head);
1614 static device_method_t ntb_transport_methods[] = {
1615 /* Device interface */
1616 DEVMETHOD(device_probe, ntb_transport_probe),
1617 DEVMETHOD(device_attach, ntb_transport_attach),
1618 DEVMETHOD(device_detach, ntb_transport_detach),
1620 DEVMETHOD(bus_child_location_str, ntb_transport_child_location_str),
1621 DEVMETHOD(bus_print_child, ntb_transport_print_child),
1625 devclass_t ntb_transport_devclass;
1626 static DEFINE_CLASS_0(ntb_transport, ntb_transport_driver,
1627 ntb_transport_methods, sizeof(struct ntb_transport_ctx));
1628 DRIVER_MODULE(ntb_transport, ntb_hw, ntb_transport_driver,
1629 ntb_transport_devclass, NULL, NULL);
1630 MODULE_DEPEND(ntb_transport, ntb, 1, 1, 1);
1631 MODULE_VERSION(ntb_transport, 1);