Lines Matching +full:layer +full:- +full:buffer +full:- +full:offset
1 /*-
2 * Copyright (c) 2016-2017 Alexander Motin <mav@FreeBSD.org>
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.
75 "ntb_transport log level -- higher is more verbose");
86 "If enabled (non-zero), limit the size of large memory windows. "
91 &enable_xeon_watchdog, 0, "If non-zero, write a register every second to "
125 uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */
233 * to keep the protocol in lock-step with the Linux NTB driver.
248 * Some NTB-using hardware have a watchdog to work around NTB hangs; if
265 #define QP_TO_MW(nt, qp) ((qp) % nt->mw_count)
279 struct ntb_queue_entry *entry, void *offset);
328 ntb_spad_write(nt->dev, NTBT_WATCHDOG_SPAD, 0);
329 callout_reset(&nt->link_watchdog, 1 * hz, xeon_link_watchdog_hb, nt);
344 struct ntb_transport_child **cpp = &nt->child;
353 nt->dev = dev;
354 nt->mw_count = ntb_mw_count(dev);
358 KASSERT(db_bitmap == ((uint64_t)1 << db_count) - 1,
361 if (nt->mw_count == 0) {
365 nt->compact = (spad_count < 4 + 2 * nt->mw_count);
368 TUNABLE_INT_FETCH(buf, &nt->compact);
369 if (nt->compact) {
374 if (spad_count < 2 + nt->mw_count) {
375 nt->mw_count = spad_count - 2;
377 "memory windows.\n", nt->mw_count);
384 if (spad_count < 4 + 2 * nt->mw_count) {
385 nt->mw_count = (spad_count - 4) / 2;
387 "memory windows.\n", nt->mw_count);
395 nt->mw_vec = malloc(nt->mw_count * sizeof(*nt->mw_vec), M_NTB_T,
397 for (i = 0; i < nt->mw_count; i++) {
398 mw = &nt->mw_vec[i];
400 rc = ntb_mw_get_range(dev, i, &mw->phys_addr, &mw->vbase,
401 &mw->phys_size, &mw->xlat_align, &mw->xlat_align_size,
402 &mw->addr_limit);
406 mw->tx_size = mw->phys_size;
407 if (max_mw_size != 0 && mw->tx_size > max_mw_size) {
409 "%ju to %ju\n", i, (uintmax_t)mw->tx_size,
411 mw->tx_size = max_mw_size;
413 if (nt->compact && mw->tx_size > UINT32_MAX) {
415 "(%ju)\n", i, (uintmax_t)mw->tx_size);
420 mw->rx_size = 0;
421 mw->buff_size = 0;
422 mw->virt_addr = NULL;
423 mw->dma_addr = 0;
435 ntb_set_mw(nt, i, mw->tx_size);
439 qpo = imin(db_count, nt->mw_count);
452 qp = (np && np[0] != 0) ? strtol(np, NULL, 10) : qpo - qpu;
456 if (qp > qpt - qpu) {
462 nc->consumer = i;
463 nc->qpoff = qpu;
464 nc->qpcnt = qp;
465 nc->dev = device_add_child(dev, name, DEVICE_UNIT_ANY);
466 if (nc->dev == NULL) {
470 device_set_ivars(nc->dev, nc);
472 cpp = &nc->next;
478 printf("-%d", qpu + qp - 1);
485 nt->qp_count = qpu;
487 nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_T,
490 for (i = 0; i < nt->qp_count; i++)
493 callout_init(&nt->link_work, 1);
494 callout_init(&nt->link_watchdog, 1);
495 TASK_INIT(&nt->link_cleanup, 0, ntb_transport_link_cleanup_work, nt);
496 nt->link_is_up = false;
504 for (i = 0; i < nt->mw_count; i++) {
505 mw = &nt->mw_vec[i];
506 rc = ntb_mw_set_trans(nt->dev, i, mw->dma_addr, mw->buff_size);
512 callout_reset(&nt->link_watchdog, 0, xeon_link_watchdog_hb, nt);
518 free(nt->qp_vec, M_NTB_T);
519 free(nt->mw_vec, M_NTB_T);
527 struct ntb_transport_child **cpp = &nt->child;
532 *cpp = (*cpp)->next;
533 error = device_delete_child(dev, nc->dev);
538 KASSERT(nt->qp_bitmap == 0,
539 ("Some queues not freed on detach (%jx)", nt->qp_bitmap));
542 taskqueue_drain(taskqueue_swi, &nt->link_cleanup);
543 callout_drain(&nt->link_work);
544 callout_drain(&nt->link_watchdog);
549 for (i = 0; i < nt->mw_count; i++)
552 free(nt->qp_vec, M_NTB_T);
553 free(nt->mw_vec, M_NTB_T);
564 if (nc->qpcnt > 0) {
565 printf(" queue %d", nc->qpoff);
566 if (nc->qpcnt > 1)
567 printf("-%d", nc->qpoff + nc->qpcnt - 1);
569 retval += printf(" at consumer %d", nc->consumer);
581 sbuf_printf(sb, "consumer=%d", nc->consumer);
590 return (nc->qpcnt);
603 mw_count = nt->mw_count;
605 mw = &nt->mw_vec[mw_num];
607 qp = &nt->qp_vec[qp_num];
608 qp->qp_num = qp_num;
609 qp->transport = nt;
610 qp->dev = nt->dev;
611 qp->client_ready = false;
612 qp->event_handler = NULL;
615 if (mw_num < nt->qp_count % mw_count)
616 num_qps_mw = nt->qp_count / mw_count + 1;
618 num_qps_mw = nt->qp_count / mw_count;
620 mw_base = mw->phys_addr;
622 tx_size = mw->tx_size / num_qps_mw;
625 qp->tx_mw = mw->vbase + qp_offset;
626 KASSERT(qp->tx_mw != NULL, ("uh oh?"));
629 qp->tx_mw_phys = mw_base + qp_offset;
630 KASSERT(qp->tx_mw_phys != 0, ("uh oh?"));
632 tx_size -= sizeof(struct ntb_rx_info);
633 qp->rx_info = (void *)(qp->tx_mw + tx_size);
635 /* Due to house-keeping, there must be at least 2 buffs */
636 qp->tx_max_frame = qmin(transport_mtu, tx_size / 2);
637 qp->tx_max_entry = tx_size / qp->tx_max_frame;
639 callout_init(&qp->link_work, 1);
640 callout_init(&qp->rx_full, 1);
642 mtx_init(&qp->ntb_rx_q_lock, "ntb rx q", NULL, MTX_SPIN);
643 mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN);
644 mtx_init(&qp->tx_lock, "ntb transport tx", NULL, MTX_DEF);
645 TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp);
646 qp->rxc_tq = taskqueue_create("ntbt_rx", M_WAITOK,
647 taskqueue_thread_enqueue, &qp->rxc_tq);
648 taskqueue_start_threads(&qp->rxc_tq, 1, PI_NET, "%s rx%d",
649 device_get_nameunit(nt->dev), qp_num);
651 STAILQ_INIT(&qp->rx_post_q);
652 STAILQ_INIT(&qp->rx_pend_q);
653 STAILQ_INIT(&qp->tx_free_q);
659 struct ntb_transport_ctx *nt = qp->transport;
662 callout_drain(&qp->link_work);
664 ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
665 taskqueue_drain_all(qp->rxc_tq);
666 taskqueue_free(qp->rxc_tq);
668 qp->cb_data = NULL;
669 qp->rx_handler = NULL;
670 qp->tx_handler = NULL;
671 qp->event_handler = NULL;
673 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_pend_q)))
676 while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_post_q)))
679 while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q)))
682 nt->qp_bitmap &= ~(1 << qp->qp_num);
686 * ntb_transport_create_queue - Create a new NTB transport layer queue
691 * Create a new NTB transport layer queue and provide the queue with a callback
709 if (q < 0 || q >= nc->qpcnt)
712 qp = &nt->qp_vec[nc->qpoff + q];
713 nt->qp_bitmap |= (1 << qp->qp_num);
714 qp->cb_data = data;
715 qp->rx_handler = handlers->rx_handler;
716 qp->tx_handler = handlers->tx_handler;
717 qp->event_handler = handlers->event_handler;
721 entry->cb_data = data;
722 entry->buf = NULL;
723 entry->len = transport_mtu;
724 entry->qp = qp;
725 ntb_list_add(&qp->ntb_rx_q_lock, entry, &qp->rx_pend_q);
730 entry->qp = qp;
731 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
734 ntb_db_clear(dev, 1ull << qp->qp_num);
739 * ntb_transport_link_up - Notify NTB transport of client readiness to use queue
740 * @qp: NTB transport layer queue to be enabled
742 * Notify NTB transport layer of client readiness to use queue
747 struct ntb_transport_ctx *nt = qp->transport;
749 qp->client_ready = true;
751 ntb_printf(2, "qp %d client ready\n", qp->qp_num);
753 if (nt->link_is_up)
754 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
760 * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry
761 * @qp: NTB transport layer queue the entry is to be enqueued on
762 * @cb: per buffer pointer for callback function to use
763 * @data: pointer to data buffer that will be sent
764 * @len: length of the data buffer
766 * Enqueue a new transmit buffer onto the transport queue from which a NTB
779 if (!qp->link_is_up || len == 0) {
784 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
787 qp->tx_err_no_buf++;
792 entry->cb_data = cb;
793 entry->buf = data;
794 entry->len = len;
795 entry->flags = 0;
797 mtx_lock(&qp->tx_lock);
799 mtx_unlock(&qp->tx_lock);
801 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
813 struct ntb_transport_qp *qp = entry->qp;
814 struct ntb_payload_header *hdr = entry->x_hdr;
816 iowrite32(entry->flags | NTBT_DESC_DONE_FLAG, &hdr->flags);
819 ntb_peer_db_set(qp->dev, 1ull << qp->qp_num);
826 if (entry->len > 0) {
827 qp->tx_bytes += entry->len;
829 if (qp->tx_handler)
830 qp->tx_handler(qp, qp->cb_data, entry->buf,
831 entry->len);
833 m_freem(entry->buf);
834 entry->buf = NULL;
838 "TX: entry %p sent. hdr->ver = %u, hdr->flags = 0x%x, Returning "
839 "to tx_free_q", entry, hdr->ver, hdr->flags);
840 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
844 ntb_memcpy_tx(struct ntb_queue_entry *entry, void *offset)
847 CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset);
848 if (entry->buf != NULL) {
849 m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset);
865 void *offset;
867 offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
868 hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame -
870 entry->x_hdr = hdr;
872 iowrite32(entry->len, &hdr->len);
873 iowrite32(qp->tx_pkts, &hdr->ver);
875 ntb_memcpy_tx(entry, offset);
884 qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry);
885 if (qp->tx_index == qp->remote_rx_info->entry) {
887 qp->tx_ring_full++;
891 if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) {
892 if (qp->tx_handler != NULL)
893 qp->tx_handler(qp, qp->cb_data, entry->buf,
896 m_freem(entry->buf);
898 entry->buf = NULL;
899 ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q);
905 CTR2(KTR_NTB, "TX: copying entry %p to index %u", entry, qp->tx_index);
908 qp->tx_index++;
909 qp->tx_index %= qp->tx_max_entry;
911 qp->tx_pkts++;
921 uint64_t qp_mask = 1ull << qp->qp_num;
930 if ((ntb_db_read(qp->dev) & qp_mask) != 0) {
932 ntb_db_clear(qp->dev, qp_mask);
935 if (qp->link_is_up)
936 ntb_db_clear_mask(qp->dev, qp_mask);
944 caddr_t offset;
946 offset = qp->rx_buff + qp->rx_max_frame * qp->rx_index;
947 hdr = (void *)(offset + qp->rx_max_frame -
950 CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index);
951 if ((hdr->flags & NTBT_DESC_DONE_FLAG) == 0) {
953 qp->rx_ring_empty++;
957 if ((hdr->flags & NTBT_LINK_DOWN_FLAG) != 0) {
960 hdr->flags = 0;
964 if (hdr->ver != (uint32_t)qp->rx_pkts) {
966 "Returning entry to rx_pend_q", hdr->ver, qp->rx_pkts);
967 qp->rx_err_ver++;
971 entry = ntb_list_mv(&qp->ntb_rx_q_lock, &qp->rx_pend_q, &qp->rx_post_q);
973 qp->rx_err_no_buf++;
977 callout_stop(&qp->rx_full);
980 entry->x_hdr = hdr;
981 entry->index = qp->rx_index;
983 if (hdr->len > entry->len) {
985 (uintmax_t)hdr->len, (uintmax_t)entry->len);
986 qp->rx_err_oflow++;
988 entry->len = -EIO;
989 entry->flags |= NTBT_DESC_DONE_FLAG;
993 qp->rx_bytes += hdr->len;
994 qp->rx_pkts++;
996 CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts);
998 entry->len = hdr->len;
1000 ntb_memcpy_rx(qp, entry, offset);
1003 qp->rx_index++;
1004 qp->rx_index %= qp->rx_max_entry;
1010 void *offset)
1012 struct ifnet *ifp = entry->cb_data;
1013 unsigned int len = entry->len;
1015 CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset);
1017 entry->buf = (void *)m_devget(offset, len, 0, ifp, NULL);
1018 if (entry->buf == NULL)
1019 entry->len = -ENOMEM;
1024 CTR2(KTR_NTB, "RX: copied entry %p to mbuf %p.", entry, entry->buf);
1034 entry->flags |= NTBT_DESC_DONE_FLAG;
1047 mtx_lock_spin(&qp->ntb_rx_q_lock);
1049 while (!STAILQ_EMPTY(&qp->rx_post_q)) {
1050 entry = STAILQ_FIRST(&qp->rx_post_q);
1051 if ((entry->flags & NTBT_DESC_DONE_FLAG) == 0)
1054 entry->x_hdr->flags = 0;
1055 iowrite32(entry->index, &qp->rx_info->entry);
1057 STAILQ_REMOVE_HEAD(&qp->rx_post_q, entry);
1059 len = entry->len;
1060 m = entry->buf;
1063 * Re-initialize queue_entry for reuse; rx_handler takes
1066 entry->buf = NULL;
1067 entry->len = transport_mtu;
1068 entry->cb_data = qp->cb_data;
1070 STAILQ_INSERT_TAIL(&qp->rx_pend_q, entry, entry);
1072 mtx_unlock_spin(&qp->ntb_rx_q_lock);
1075 if (qp->rx_handler != NULL && qp->client_ready)
1076 qp->rx_handler(qp, qp->cb_data, m, len);
1080 mtx_lock_spin(&qp->ntb_rx_q_lock);
1083 mtx_unlock_spin(&qp->ntb_rx_q_lock);
1094 vec_mask = ntb_db_vector_mask(nt->dev, vector);
1095 vec_mask &= nt->qp_bitmap;
1096 if ((vec_mask & (vec_mask - 1)) != 0)
1097 vec_mask &= ntb_db_read(nt->dev);
1099 ntb_db_set_mask(nt->dev, vec_mask);
1100 ntb_db_clear(nt->dev, vec_mask);
1103 qp_num = ffsll(vec_mask) - 1;
1105 qp = &nt->qp_vec[qp_num];
1106 if (qp->link_is_up)
1107 taskqueue_enqueue(qp->rxc_tq, &qp->rxc_db_work);
1119 if (ntb_link_is_up(nt->dev, &nt->link_speed, &nt->link_width)) {
1121 callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt);
1124 taskqueue_enqueue(taskqueue_swi, &nt->link_cleanup);
1134 device_t dev = nt->dev;
1142 if (nt->compact) {
1143 for (i = 0; i < nt->mw_count; i++) {
1144 size = nt->mw_vec[i].tx_size;
1150 (nt->qp_count << 24) | (nt->mw_count << 16) |
1153 for (i = 0; i < nt->mw_count; i++) {
1154 size = nt->mw_vec[i].tx_size;
1159 ntb_peer_spad_write(dev, NTBT_NUM_MWS, nt->mw_count);
1160 ntb_peer_spad_write(dev, NTBT_NUM_QPS, nt->qp_count);
1167 if (nt->compact) {
1169 if (val != ((nt->qp_count << 24) | (nt->mw_count << 16) |
1178 if (val != nt->qp_count)
1182 if (val != nt->mw_count)
1186 for (i = 0; i < nt->mw_count; i++) {
1187 if (nt->compact) {
1198 mw = &nt->mw_vec[i];
1199 mw->rx_size = val64;
1200 val64 = roundup(val64, mw->xlat_align_size);
1201 if (mw->buff_size != val64) {
1209 /* Notify HW the memory location of the receive buffer */
1210 rc = ntb_mw_set_trans(nt->dev, i, mw->dma_addr,
1211 mw->buff_size);
1220 nt->link_is_up = true;
1223 for (i = 0; i < nt->qp_count; i++) {
1224 qp = &nt->qp_vec[i];
1228 if (qp->client_ready)
1229 callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
1235 for (i = 0; i < nt->mw_count; i++)
1238 if (ntb_link_is_up(dev, &nt->link_speed, &nt->link_width))
1239 callout_reset(&nt->link_work,
1253 if (!(cba->error = error))
1254 cba->addr = segs[0].ds_addr;
1260 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
1267 buff_size = roundup(size, mw->xlat_align_size);
1269 /* No need to re-setup */
1270 if (mw->buff_size == buff_size)
1273 if (mw->buff_size != 0)
1277 mw->buff_size = buff_size;
1279 if (bus_dma_tag_create(bus_get_dma_tag(nt->dev), mw->xlat_align, 0,
1280 mw->addr_limit, BUS_SPACE_MAXADDR,
1281 NULL, NULL, mw->buff_size, 1, mw->buff_size,
1282 0, NULL, NULL, &mw->dma_tag)) {
1284 mw->buff_size);
1285 mw->buff_size = 0;
1288 if (bus_dmamem_alloc(mw->dma_tag, (void **)&mw->virt_addr,
1289 BUS_DMA_WAITOK | BUS_DMA_ZERO, &mw->dma_map)) {
1290 bus_dma_tag_destroy(mw->dma_tag);
1291 ntb_printf(0, "Unable to allocate MW buffer of size %zu\n",
1292 mw->buff_size);
1293 mw->buff_size = 0;
1296 if (bus_dmamap_load(mw->dma_tag, mw->dma_map, mw->virt_addr,
1297 mw->buff_size, ntb_load_cb, &cba, BUS_DMA_NOWAIT) || cba.error) {
1298 bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
1299 bus_dma_tag_destroy(mw->dma_tag);
1300 ntb_printf(0, "Unable to load MW buffer of size %zu\n",
1301 mw->buff_size);
1302 mw->buff_size = 0;
1305 mw->dma_addr = cba.addr;
1313 struct ntb_transport_mw *mw = &nt->mw_vec[num_mw];
1315 if (mw->virt_addr == NULL)
1318 ntb_mw_clear_trans(nt->dev, num_mw);
1319 bus_dmamap_unload(mw->dma_tag, mw->dma_map);
1320 bus_dmamem_free(mw->dma_tag, mw->virt_addr, mw->dma_map);
1321 bus_dma_tag_destroy(mw->dma_tag);
1322 mw->buff_size = 0;
1323 mw->virt_addr = NULL;
1329 struct ntb_transport_qp *qp = &nt->qp_vec[qp_num];
1331 void *offset;
1336 mw_count = nt->mw_count;
1338 mw = &nt->mw_vec[mw_num];
1340 if (mw->virt_addr == NULL)
1343 if (mw_num < nt->qp_count % mw_count)
1344 num_qps_mw = nt->qp_count / mw_count + 1;
1346 num_qps_mw = nt->qp_count / mw_count;
1348 rx_size = mw->rx_size / num_qps_mw;
1349 qp->rx_buff = mw->virt_addr + rx_size * (qp_num / mw_count);
1350 rx_size -= sizeof(struct ntb_rx_info);
1352 qp->remote_rx_info = (void*)(qp->rx_buff + rx_size);
1354 /* Due to house-keeping, there must be at least 2 buffs */
1355 qp->rx_max_frame = qmin(transport_mtu, rx_size / 2);
1356 qp->rx_max_entry = rx_size / qp->rx_max_frame;
1357 qp->rx_index = 0;
1359 qp->remote_rx_info->entry = qp->rx_max_entry - 1;
1362 for (i = 0; i < qp->rx_max_entry; i++) {
1363 offset = (void *)(qp->rx_buff + qp->rx_max_frame * (i + 1) -
1365 memset(offset, 0, sizeof(struct ntb_payload_header));
1368 qp->rx_pkts = 0;
1369 qp->tx_pkts = 0;
1370 qp->tx_index = 0;
1379 device_t dev = qp->dev;
1380 struct ntb_transport_ctx *nt = qp->transport;
1385 for (i = 0, val = 0; i < nt->qp_count; i++) {
1386 if (nt->qp_vec[i].client_ready)
1393 if ((val & (1ull << qp->qp_num)) != 0) {
1394 ntb_printf(2, "qp %d link up\n", qp->qp_num);
1395 qp->link_is_up = true;
1397 if (qp->event_handler != NULL)
1398 qp->event_handler(qp->cb_data, NTB_LINK_UP);
1400 ntb_db_clear_mask(dev, 1ull << qp->qp_num);
1401 } else if (nt->link_is_up)
1402 callout_reset(&qp->link_work,
1413 callout_drain(&nt->link_work);
1414 nt->link_is_up = 0;
1417 for (i = 0; i < nt->qp_count; i++) {
1418 if ((nt->qp_bitmap & (1 << i)) != 0) {
1419 qp = &nt->qp_vec[i];
1421 callout_drain(&qp->link_work);
1430 ntb_spad_clear(nt->dev);
1451 qp->link_is_up = false;
1452 ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
1454 qp->tx_index = qp->rx_index = 0;
1455 qp->tx_bytes = qp->rx_bytes = 0;
1456 qp->tx_pkts = qp->rx_pkts = 0;
1458 qp->rx_ring_empty = 0;
1459 qp->tx_ring_full = 0;
1461 qp->rx_err_no_buf = qp->tx_err_no_buf = 0;
1462 qp->rx_err_oflow = qp->rx_err_ver = 0;
1469 callout_drain(&qp->link_work);
1472 if (qp->event_handler != NULL)
1473 qp->event_handler(qp->cb_data, NTB_LINK_DOWN);
1478 * ntb_transport_link_down - Notify NTB transport to no longer enqueue data
1479 * @qp: NTB transport layer queue to be disabled
1481 * Notify NTB transport layer of client's desire to no longer receive data on
1488 struct ntb_transport_ctx *nt = qp->transport;
1492 qp->client_ready = false;
1493 for (i = 0, val = 0; i < nt->qp_count; i++) {
1494 if (nt->qp_vec[i].client_ready)
1497 ntb_peer_spad_write(qp->dev, NTBT_QP_LINKS, val);
1499 if (qp->link_is_up)
1502 callout_drain(&qp->link_work);
1506 * ntb_transport_link_query - Query transport link state
1507 * @qp: NTB transport layer queue to be queried
1517 return (qp->link_is_up);
1521 * ntb_transport_link_speed - Query transport link speed
1522 * @qp: NTB transport layer queue to be queried
1531 struct ntb_transport_ctx *nt = qp->transport;
1534 if (!nt->link_is_up)
1536 switch (nt->link_speed) {
1552 if (nt->link_width <= 0)
1554 return (rate * nt->link_width);
1563 if (!qp->link_is_up)
1567 entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
1576 entry->cb_data = NULL;
1577 entry->buf = NULL;
1578 entry->len = 0;
1579 entry->flags = NTBT_LINK_DOWN_FLAG;
1581 mtx_lock(&qp->tx_lock);
1583 mtx_unlock(&qp->tx_lock);
1641 * ntb_transport_qp_num - Query the qp number
1642 * @qp: NTB transport layer queue to be queried
1651 return (qp->qp_num);
1655 * ntb_transport_max_size - Query the max payload size of a qp
1656 * @qp: NTB transport layer queue to be queried
1666 return (qp->tx_max_frame - sizeof(struct ntb_payload_header));
1672 unsigned int head = qp->tx_index;
1673 unsigned int tail = qp->remote_rx_info->entry;
1675 return (tail >= head ? tail - head : qp->tx_max_entry + tail - head);