ntb_transport.c revision 289650
1250079Scarl/*- 2250079Scarl * Copyright (C) 2013 Intel Corporation 3289545Scem * Copyright (C) 2015 EMC Corporation 4250079Scarl * All rights reserved. 5250079Scarl * 6250079Scarl * Redistribution and use in source and binary forms, with or without 7250079Scarl * modification, are permitted provided that the following conditions 8250079Scarl * are met: 9250079Scarl * 1. Redistributions of source code must retain the above copyright 10250079Scarl * notice, this list of conditions and the following disclaimer. 11250079Scarl * 2. Redistributions in binary form must reproduce the above copyright 12250079Scarl * notice, this list of conditions and the following disclaimer in the 13250079Scarl * documentation and/or other materials provided with the distribution. 14250079Scarl * 15250079Scarl * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16250079Scarl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17250079Scarl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18250079Scarl * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19250079Scarl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20250079Scarl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21250079Scarl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22250079Scarl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23250079Scarl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24250079Scarl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25250079Scarl * SUCH DAMAGE. 26250079Scarl */ 27250079Scarl 28250079Scarl#include <sys/cdefs.h> 29250079Scarl__FBSDID("$FreeBSD: head/sys/dev/ntb/if_ntb/if_ntb.c 289650 2015-10-20 19:20:33Z cem $"); 30250079Scarl 31250079Scarl#include <sys/param.h> 32250079Scarl#include <sys/kernel.h> 33250079Scarl#include <sys/systm.h> 34289544Scem#include <sys/bitset.h> 35250079Scarl#include <sys/bus.h> 36250079Scarl#include <sys/ktr.h> 37289281Scem#include <sys/limits.h> 38250079Scarl#include <sys/lock.h> 39250079Scarl#include <sys/malloc.h> 40250079Scarl#include <sys/module.h> 41250079Scarl#include <sys/mutex.h> 42250079Scarl#include <sys/queue.h> 43250079Scarl#include <sys/socket.h> 44250079Scarl#include <sys/sockio.h> 45289207Scem#include <sys/sysctl.h> 46250079Scarl#include <sys/taskqueue.h> 47289544Scem 48250079Scarl#include <net/if.h> 49250079Scarl#include <net/if_media.h> 50250079Scarl#include <net/if_types.h> 51250079Scarl#include <net/if_var.h> 52250079Scarl#include <net/bpf.h> 53250079Scarl#include <net/ethernet.h> 54289544Scem 55250079Scarl#include <vm/vm.h> 56250079Scarl#include <vm/pmap.h> 57289544Scem 58250079Scarl#include <machine/bus.h> 59250079Scarl#include <machine/cpufunc.h> 60250079Scarl#include <machine/pmap.h> 61250079Scarl 62250079Scarl#include "../ntb_hw/ntb_hw.h" 63250079Scarl 64250079Scarl/* 65250079Scarl * The Non-Transparent Bridge (NTB) is a device on some Intel processors that 66250079Scarl * allows you to connect two systems using a PCI-e link. 67250079Scarl * 68250079Scarl * This module contains a protocol for sending and receiving messages, and 69250079Scarl * exposes that protocol through a simulated ethernet device called ntb. 70250079Scarl * 71250079Scarl * NOTE: Much of the code in this module is shared with Linux. Any patches may 72250079Scarl * be picked up and redistributed in Linux with a dual GPL/BSD license. 73250079Scarl */ 74250079Scarl 75289544Scem#define QP_SETSIZE 64 76289544ScemBITSET_DEFINE(_qpset, QP_SETSIZE); 77289544Scem#define test_bit(pos, addr) BIT_ISSET(QP_SETSIZE, (pos), (addr)) 78289544Scem#define set_bit(pos, addr) BIT_SET(QP_SETSIZE, (pos), (addr)) 79289544Scem#define clear_bit(pos, addr) BIT_CLR(QP_SETSIZE, (pos), (addr)) 80289544Scem#define ffs_bit(addr) BIT_FFS(QP_SETSIZE, (addr)) 81250079Scarl 82250079Scarl#define KTR_NTB KTR_SPARE3 83250079Scarl 84289546Scem#define NTB_TRANSPORT_VERSION 4 85250079Scarl#define NTB_RX_MAX_PKTS 64 86250079Scarl#define NTB_RXQ_SIZE 300 87250079Scarl 88289546Scemenum ntb_link_event { 89289546Scem NTB_LINK_DOWN = 0, 90289546Scem NTB_LINK_UP, 91289546Scem}; 92289546Scem 93289616Scemstatic unsigned int transport_mtu = 0x10000 + ETHER_HDR_LEN + ETHER_CRC_LEN; 94289208Scem 95289546Scemstatic uint64_t max_mw_size; 96289546ScemSYSCTL_UQUAD(_hw_ntb, OID_AUTO, max_mw_size, CTLFLAG_RDTUN, &max_mw_size, 0, 97289546Scem "If enabled (non-zero), limit the size of large memory windows. " 98289546Scem "Both sides of the NTB MUST set the same value here."); 99289546Scem 100289396Scemstatic unsigned int max_num_clients; 101289396ScemSYSCTL_UINT(_hw_ntb, OID_AUTO, max_num_clients, CTLFLAG_RDTUN, 102289396Scem &max_num_clients, 0, "Maximum number of NTB transport clients. " 103289396Scem "0 (default) - use all available NTB memory windows; " 104289396Scem "positive integer N - Limit to N memory windows."); 105250079Scarl 106250079ScarlSTAILQ_HEAD(ntb_queue_list, ntb_queue_entry); 107250079Scarl 108250079Scarlstruct ntb_queue_entry { 109250079Scarl /* ntb_queue list reference */ 110250079Scarl STAILQ_ENTRY(ntb_queue_entry) entry; 111250079Scarl 112289546Scem /* info on data to be transferred */ 113250079Scarl void *cb_data; 114250079Scarl void *buf; 115289546Scem unsigned len; 116289546Scem unsigned flags; 117289546Scem 118289546Scem struct ntb_transport_qp *qp; 119289546Scem struct ntb_payload_header *x_hdr; 120289546Scem unsigned index; 121250079Scarl}; 122250079Scarl 123250079Scarlstruct ntb_rx_info { 124250079Scarl unsigned int entry; 125250079Scarl}; 126250079Scarl 127250079Scarlstruct ntb_transport_qp { 128289545Scem struct ntb_transport_ctx *transport; 129250079Scarl struct ntb_softc *ntb; 130250079Scarl 131250079Scarl void *cb_data; 132250079Scarl 133250079Scarl bool client_ready; 134289545Scem bool link_is_up; 135255281Scarl uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */ 136250079Scarl 137250079Scarl struct ntb_rx_info *rx_info; 138250079Scarl struct ntb_rx_info *remote_rx_info; 139250079Scarl 140289341Scem void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, 141250079Scarl void *data, int len); 142250079Scarl struct ntb_queue_list tx_free_q; 143250079Scarl struct mtx ntb_tx_free_q_lock; 144250079Scarl void *tx_mw; 145289546Scem bus_addr_t tx_mw_phys; 146250079Scarl uint64_t tx_index; 147250079Scarl uint64_t tx_max_entry; 148250079Scarl uint64_t tx_max_frame; 149250079Scarl 150289341Scem void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, 151250079Scarl void *data, int len); 152250079Scarl struct ntb_queue_list rx_pend_q; 153250079Scarl struct ntb_queue_list rx_free_q; 154250079Scarl struct mtx ntb_rx_pend_q_lock; 155250079Scarl struct mtx ntb_rx_free_q_lock; 156250079Scarl struct task rx_completion_task; 157289546Scem struct task rxc_db_work; 158250079Scarl void *rx_buff; 159250079Scarl uint64_t rx_index; 160250079Scarl uint64_t rx_max_entry; 161250079Scarl uint64_t rx_max_frame; 162250079Scarl 163289341Scem void (*event_handler)(void *data, enum ntb_link_event status); 164250079Scarl struct callout link_work; 165250079Scarl struct callout queue_full; 166250079Scarl struct callout rx_full; 167250079Scarl 168250079Scarl uint64_t last_rx_no_buf; 169250079Scarl 170250079Scarl /* Stats */ 171250079Scarl uint64_t rx_bytes; 172250079Scarl uint64_t rx_pkts; 173250079Scarl uint64_t rx_ring_empty; 174250079Scarl uint64_t rx_err_no_buf; 175250079Scarl uint64_t rx_err_oflow; 176250079Scarl uint64_t rx_err_ver; 177250079Scarl uint64_t tx_bytes; 178250079Scarl uint64_t tx_pkts; 179250079Scarl uint64_t tx_ring_full; 180250079Scarl}; 181250079Scarl 182250079Scarlstruct ntb_queue_handlers { 183289341Scem void (*rx_handler)(struct ntb_transport_qp *qp, void *qp_data, 184250079Scarl void *data, int len); 185289341Scem void (*tx_handler)(struct ntb_transport_qp *qp, void *qp_data, 186250079Scarl void *data, int len); 187289341Scem void (*event_handler)(void *data, enum ntb_link_event status); 188250079Scarl}; 189250079Scarl 190250079Scarlstruct ntb_transport_mw { 191289546Scem vm_paddr_t phys_addr; 192289546Scem size_t phys_size; 193289546Scem size_t xlat_align; 194289546Scem size_t xlat_align_size; 195289546Scem /* Tx buff is off vbase / phys_addr */ 196289546Scem void *vbase; 197289545Scem size_t xlat_size; 198289546Scem size_t buff_size; 199289546Scem /* Rx buff is off virt_addr / dma_addr */ 200250079Scarl void *virt_addr; 201289546Scem bus_addr_t dma_addr; 202250079Scarl}; 203250079Scarl 204289545Scemstruct ntb_transport_ctx { 205250079Scarl struct ntb_softc *ntb; 206250079Scarl struct ifnet *ifp; 207289545Scem struct ntb_transport_mw mw_vec[NTB_MAX_NUM_MW]; 208289545Scem struct ntb_transport_qp *qp_vec; 209289544Scem struct _qpset qp_bitmap; 210289546Scem struct _qpset qp_bitmap_free; 211289545Scem unsigned mw_count; 212289545Scem unsigned qp_count; 213289545Scem enum ntb_link_event link_is_up; 214250079Scarl struct callout link_work; 215250079Scarl uint64_t bufsize; 216250079Scarl u_char eaddr[ETHER_ADDR_LEN]; 217250079Scarl struct mtx tx_lock; 218250079Scarl struct mtx rx_lock; 219289546Scem 220289546Scem /* The hardcoded single queuepair in ntb_setup_interface() */ 221289546Scem struct ntb_transport_qp *qp; 222250079Scarl}; 223250079Scarl 224289545Scemstatic struct ntb_transport_ctx net_softc; 225250079Scarl 226250079Scarlenum { 227250079Scarl IF_NTB_DESC_DONE_FLAG = 1 << 0, 228250079Scarl IF_NTB_LINK_DOWN_FLAG = 1 << 1, 229250079Scarl}; 230250079Scarl 231250079Scarlstruct ntb_payload_header { 232250079Scarl uint64_t ver; 233250079Scarl uint64_t len; 234250079Scarl uint64_t flags; 235250079Scarl}; 236250079Scarl 237250079Scarlenum { 238289153Scem /* 239289153Scem * The order of this enum is part of the if_ntb remote protocol. Do 240289153Scem * not reorder without bumping protocol version (and it's probably best 241289153Scem * to keep the protocol in lock-step with the Linux NTB driver. 242289153Scem */ 243250079Scarl IF_NTB_VERSION = 0, 244289153Scem IF_NTB_QP_LINKS, 245250079Scarl IF_NTB_NUM_QPS, 246289153Scem IF_NTB_NUM_MWS, 247289153Scem /* 248289153Scem * N.B.: transport_link_work assumes MW1 enums = MW0 + 2. 249289153Scem */ 250289153Scem IF_NTB_MW0_SZ_HIGH, 251289153Scem IF_NTB_MW0_SZ_LOW, 252289153Scem IF_NTB_MW1_SZ_HIGH, 253289153Scem IF_NTB_MW1_SZ_LOW, 254250079Scarl IF_NTB_MAX_SPAD, 255250079Scarl}; 256250079Scarl 257289545Scem#define QP_TO_MW(nt, qp) ((qp) % nt->mw_count) 258250079Scarl#define NTB_QP_DEF_NUM_ENTRIES 100 259250079Scarl#define NTB_LINK_DOWN_TIMEOUT 10 260250079Scarl 261250079Scarlstatic int ntb_handle_module_events(struct module *m, int what, void *arg); 262250079Scarlstatic int ntb_setup_interface(void); 263250079Scarlstatic int ntb_teardown_interface(void); 264250079Scarlstatic void ntb_net_init(void *arg); 265250079Scarlstatic int ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data); 266250079Scarlstatic void ntb_start(struct ifnet *ifp); 267250079Scarlstatic void ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, 268250079Scarl void *data, int len); 269250079Scarlstatic void ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, 270250079Scarl void *data, int len); 271289340Scemstatic void ntb_net_event_handler(void *data, enum ntb_link_event status); 272250079Scarlstatic int ntb_transport_init(struct ntb_softc *ntb); 273289546Scemstatic void ntb_transport_free(struct ntb_transport_ctx *); 274289545Scemstatic void ntb_transport_init_queue(struct ntb_transport_ctx *nt, 275250079Scarl unsigned int qp_num); 276250079Scarlstatic void ntb_transport_free_queue(struct ntb_transport_qp *qp); 277289546Scemstatic struct ntb_transport_qp *ntb_transport_create_queue(void *data, 278250079Scarl struct ntb_softc *pdev, const struct ntb_queue_handlers *handlers); 279250079Scarlstatic void ntb_transport_link_up(struct ntb_transport_qp *qp); 280250079Scarlstatic int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, 281250079Scarl void *data, unsigned int len); 282250079Scarlstatic int ntb_process_tx(struct ntb_transport_qp *qp, 283250079Scarl struct ntb_queue_entry *entry); 284289546Scemstatic void ntb_memcpy_tx(struct ntb_transport_qp *qp, 285250079Scarl struct ntb_queue_entry *entry, void *offset); 286250079Scarlstatic void ntb_qp_full(void *arg); 287289546Scemstatic void ntb_transport_rxc_db(void *arg, int pending); 288250079Scarlstatic void ntb_rx_pendq_full(void *arg); 289250079Scarlstatic int ntb_process_rxc(struct ntb_transport_qp *qp); 290250079Scarlstatic void ntb_rx_copy_task(struct ntb_transport_qp *qp, 291250079Scarl struct ntb_queue_entry *entry, void *offset); 292289546Scemstatic void ntb_complete_rxc(void *arg, int pending); 293289598Scemstatic void ntb_transport_doorbell_callback(void *data, uint32_t vector); 294289546Scemstatic void ntb_transport_event_callback(void *data); 295250079Scarlstatic void ntb_transport_link_work(void *arg); 296289545Scemstatic int ntb_set_mw(struct ntb_transport_ctx *, int num_mw, unsigned size); 297289545Scemstatic void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw); 298289546Scemstatic int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, 299250079Scarl unsigned int qp_num); 300250079Scarlstatic void ntb_qp_link_work(void *arg); 301289545Scemstatic void ntb_transport_link_cleanup(struct ntb_transport_ctx *nt); 302250079Scarlstatic void ntb_qp_link_down(struct ntb_transport_qp *qp); 303289613Scemstatic void ntb_qp_link_down_reset(struct ntb_transport_qp *qp); 304250079Scarlstatic void ntb_qp_link_cleanup(struct ntb_transport_qp *qp); 305250079Scarlstatic void ntb_transport_link_down(struct ntb_transport_qp *qp); 306250079Scarlstatic void ntb_send_link_down(struct ntb_transport_qp *qp); 307250079Scarlstatic void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 308250079Scarl struct ntb_queue_list *list); 309250079Scarlstatic struct ntb_queue_entry *ntb_list_rm(struct mtx *lock, 310250079Scarl struct ntb_queue_list *list); 311250079Scarlstatic void create_random_local_eui48(u_char *eaddr); 312250079Scarlstatic unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp); 313250079Scarl 314289546Scemstatic const struct ntb_ctx_ops ntb_transport_ops = { 315289546Scem .link_event = ntb_transport_event_callback, 316289546Scem .db_event = ntb_transport_doorbell_callback, 317289546Scem}; 318289546Scem 319250079ScarlMALLOC_DEFINE(M_NTB_IF, "if_ntb", "ntb network driver"); 320250079Scarl 321250079Scarl/* Module setup and teardown */ 322250079Scarlstatic int 323250079Scarlntb_handle_module_events(struct module *m, int what, void *arg) 324250079Scarl{ 325250079Scarl int err = 0; 326250079Scarl 327250079Scarl switch (what) { 328250079Scarl case MOD_LOAD: 329250079Scarl err = ntb_setup_interface(); 330250079Scarl break; 331250079Scarl case MOD_UNLOAD: 332250079Scarl err = ntb_teardown_interface(); 333250079Scarl break; 334250079Scarl default: 335250079Scarl err = EOPNOTSUPP; 336250079Scarl break; 337250079Scarl } 338250079Scarl return (err); 339250079Scarl} 340250079Scarl 341255271Scarlstatic moduledata_t if_ntb_mod = { 342255271Scarl "if_ntb", 343250079Scarl ntb_handle_module_events, 344250079Scarl NULL 345250079Scarl}; 346250079Scarl 347255271ScarlDECLARE_MODULE(if_ntb, if_ntb_mod, SI_SUB_KLD, SI_ORDER_ANY); 348255271ScarlMODULE_DEPEND(if_ntb, ntb_hw, 1, 1, 1); 349250079Scarl 350250079Scarlstatic int 351289209Scemntb_setup_interface(void) 352250079Scarl{ 353250079Scarl struct ifnet *ifp; 354250079Scarl struct ntb_queue_handlers handlers = { ntb_net_rx_handler, 355250079Scarl ntb_net_tx_handler, ntb_net_event_handler }; 356289546Scem int rc; 357250079Scarl 358250079Scarl net_softc.ntb = devclass_get_softc(devclass_find("ntb_hw"), 0); 359250079Scarl if (net_softc.ntb == NULL) { 360255281Scarl printf("ntb: Cannot find devclass\n"); 361250079Scarl return (ENXIO); 362250079Scarl } 363250079Scarl 364289546Scem rc = ntb_transport_init(net_softc.ntb); 365289546Scem if (rc != 0) { 366289546Scem printf("ntb: Cannot init transport: %d\n", rc); 367289546Scem return (rc); 368289546Scem } 369250079Scarl 370250079Scarl ifp = net_softc.ifp = if_alloc(IFT_ETHER); 371250079Scarl if (ifp == NULL) { 372289546Scem ntb_transport_free(&net_softc); 373289546Scem printf("ntb: Cannot allocate ifnet structure\n"); 374250079Scarl return (ENOMEM); 375250079Scarl } 376250079Scarl 377250079Scarl net_softc.qp = ntb_transport_create_queue(ifp, net_softc.ntb, 378250079Scarl &handlers); 379250079Scarl if_initname(ifp, "ntb", 0); 380250079Scarl ifp->if_init = ntb_net_init; 381250079Scarl ifp->if_softc = &net_softc; 382250079Scarl ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 383250079Scarl ifp->if_ioctl = ntb_ioctl; 384250079Scarl ifp->if_start = ntb_start; 385250079Scarl IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 386250079Scarl ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 387250079Scarl IFQ_SET_READY(&ifp->if_snd); 388250079Scarl create_random_local_eui48(net_softc.eaddr); 389250079Scarl ether_ifattach(ifp, net_softc.eaddr); 390250079Scarl ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_JUMBO_MTU; 391250079Scarl ifp->if_capenable = ifp->if_capabilities; 392250079Scarl 393250079Scarl ntb_transport_link_up(net_softc.qp); 394250079Scarl net_softc.bufsize = ntb_transport_max_size(net_softc.qp) + 395250079Scarl sizeof(struct ether_header); 396289645Scem 397289645Scem if_printf(ifp, "if_ntb device setup\n"); 398289645Scem 399250079Scarl return (0); 400250079Scarl} 401250079Scarl 402250079Scarlstatic int 403289209Scemntb_teardown_interface(void) 404250079Scarl{ 405250079Scarl 406255280Scarl if (net_softc.qp != NULL) 407255280Scarl ntb_transport_link_down(net_softc.qp); 408250079Scarl 409255280Scarl if (net_softc.ifp != NULL) { 410289645Scem if_printf(net_softc.ifp, "if_ntb device destroyed\n"); 411255280Scarl ether_ifdetach(net_softc.ifp); 412255280Scarl if_free(net_softc.ifp); 413255280Scarl } 414250079Scarl 415255280Scarl if (net_softc.qp != NULL) { 416255280Scarl ntb_transport_free_queue(net_softc.qp); 417255280Scarl ntb_transport_free(&net_softc); 418255280Scarl } 419255280Scarl 420250079Scarl return (0); 421250079Scarl} 422250079Scarl 423250079Scarl/* Network device interface */ 424250079Scarl 425250079Scarlstatic void 426250079Scarlntb_net_init(void *arg) 427250079Scarl{ 428289545Scem struct ntb_transport_ctx *ntb_softc = arg; 429250079Scarl struct ifnet *ifp = ntb_softc->ifp; 430250079Scarl 431250079Scarl ifp->if_drv_flags |= IFF_DRV_RUNNING; 432250079Scarl ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 433250079Scarl ifp->if_flags |= IFF_UP; 434250079Scarl if_link_state_change(ifp, LINK_STATE_UP); 435250079Scarl} 436250079Scarl 437250079Scarlstatic int 438250079Scarlntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 439250079Scarl{ 440289545Scem struct ntb_transport_ctx *nt = ifp->if_softc; 441250079Scarl struct ifreq *ifr = (struct ifreq *)data; 442250079Scarl int error = 0; 443250079Scarl 444250079Scarl switch (command) { 445250079Scarl case SIOCSIFMTU: 446250079Scarl { 447250079Scarl if (ifr->ifr_mtu > ntb_transport_max_size(nt->qp) - 448250079Scarl ETHER_HDR_LEN - ETHER_CRC_LEN) { 449250079Scarl error = EINVAL; 450250079Scarl break; 451250079Scarl } 452250079Scarl 453250079Scarl ifp->if_mtu = ifr->ifr_mtu; 454250079Scarl break; 455250079Scarl } 456250079Scarl default: 457250079Scarl error = ether_ioctl(ifp, command, data); 458250079Scarl break; 459250079Scarl } 460250079Scarl 461250079Scarl return (error); 462250079Scarl} 463250079Scarl 464250079Scarl 465250079Scarlstatic void 466250079Scarlntb_start(struct ifnet *ifp) 467250079Scarl{ 468250079Scarl struct mbuf *m_head; 469289545Scem struct ntb_transport_ctx *nt = ifp->if_softc; 470250079Scarl int rc; 471250079Scarl 472250079Scarl mtx_lock(&nt->tx_lock); 473250079Scarl ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 474250079Scarl CTR0(KTR_NTB, "TX: ntb_start"); 475250079Scarl while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 476250079Scarl IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head); 477250079Scarl CTR1(KTR_NTB, "TX: start mbuf %p", m_head); 478250079Scarl rc = ntb_transport_tx_enqueue(nt->qp, m_head, m_head, 479250079Scarl m_length(m_head, NULL)); 480250079Scarl if (rc != 0) { 481250079Scarl CTR1(KTR_NTB, 482255281Scarl "TX: could not tx mbuf %p. Returning to snd q", 483250079Scarl m_head); 484250079Scarl if (rc == EAGAIN) { 485250079Scarl ifp->if_drv_flags |= IFF_DRV_OACTIVE; 486250079Scarl IFQ_DRV_PREPEND(&ifp->if_snd, m_head); 487250079Scarl callout_reset(&nt->qp->queue_full, hz / 1000, 488250079Scarl ntb_qp_full, ifp); 489250079Scarl } 490250079Scarl break; 491250079Scarl } 492250079Scarl 493250079Scarl } 494250079Scarl mtx_unlock(&nt->tx_lock); 495250079Scarl} 496250079Scarl 497250079Scarl/* Network Device Callbacks */ 498250079Scarlstatic void 499250079Scarlntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 500250079Scarl int len) 501250079Scarl{ 502250079Scarl 503250079Scarl m_freem(data); 504250079Scarl CTR1(KTR_NTB, "TX: tx_handler freeing mbuf %p", data); 505250079Scarl} 506250079Scarl 507250079Scarlstatic void 508250079Scarlntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 509250079Scarl int len) 510250079Scarl{ 511250079Scarl struct mbuf *m = data; 512250079Scarl struct ifnet *ifp = qp_data; 513250079Scarl 514250079Scarl CTR0(KTR_NTB, "RX: rx handler"); 515250079Scarl (*ifp->if_input)(ifp, m); 516250079Scarl} 517250079Scarl 518250079Scarlstatic void 519289340Scemntb_net_event_handler(void *data, enum ntb_link_event status) 520250079Scarl{ 521289340Scem struct ifnet *ifp; 522250079Scarl 523289340Scem ifp = data; 524289340Scem (void)ifp; 525289340Scem 526289340Scem /* XXX The Linux driver munges with the carrier status here. */ 527289340Scem 528289340Scem switch (status) { 529289340Scem case NTB_LINK_DOWN: 530289340Scem break; 531289340Scem case NTB_LINK_UP: 532289340Scem break; 533289340Scem default: 534289340Scem panic("Bogus ntb_link_event %u\n", status); 535289340Scem } 536250079Scarl} 537250079Scarl 538250079Scarl/* Transport Init and teardown */ 539250079Scarl 540250079Scarlstatic int 541250079Scarlntb_transport_init(struct ntb_softc *ntb) 542250079Scarl{ 543289545Scem struct ntb_transport_ctx *nt = &net_softc; 544289546Scem struct ntb_transport_mw *mw; 545289546Scem uint64_t qp_bitmap; 546289544Scem int rc; 547289546Scem unsigned i; 548250079Scarl 549289545Scem nt->mw_count = ntb_mw_count(ntb); 550289546Scem for (i = 0; i < nt->mw_count; i++) { 551289546Scem mw = &nt->mw_vec[i]; 552289396Scem 553289546Scem rc = ntb_mw_get_range(ntb, i, &mw->phys_addr, &mw->vbase, 554289546Scem &mw->phys_size, &mw->xlat_align, &mw->xlat_align_size); 555289546Scem if (rc != 0) 556289546Scem goto err; 557289546Scem 558289546Scem mw->buff_size = 0; 559289546Scem mw->xlat_size = 0; 560289546Scem mw->virt_addr = 0; 561289546Scem mw->dma_addr = 0; 562289546Scem } 563289546Scem 564289546Scem qp_bitmap = ntb_db_valid_mask(ntb); 565289546Scem nt->qp_count = flsll(qp_bitmap); 566289546Scem KASSERT(nt->qp_count != 0, ("bogus db bitmap")); 567289546Scem nt->qp_count -= 1; 568289546Scem 569289546Scem if (max_num_clients != 0 && max_num_clients < nt->qp_count) 570289546Scem nt->qp_count = max_num_clients; 571289546Scem else if (nt->mw_count < nt->qp_count) 572289546Scem nt->qp_count = nt->mw_count; 573289546Scem KASSERT(nt->qp_count <= QP_SETSIZE, ("invalid qp_count")); 574289546Scem 575250079Scarl mtx_init(&nt->tx_lock, "ntb transport tx", NULL, MTX_DEF); 576250079Scarl mtx_init(&nt->rx_lock, "ntb transport rx", NULL, MTX_DEF); 577250079Scarl 578289545Scem nt->qp_vec = malloc(nt->qp_count * sizeof(*nt->qp_vec), M_NTB_IF, 579289545Scem M_WAITOK | M_ZERO); 580250079Scarl 581289545Scem for (i = 0; i < nt->qp_count; i++) { 582289544Scem set_bit(i, &nt->qp_bitmap); 583289546Scem set_bit(i, &nt->qp_bitmap_free); 584250079Scarl ntb_transport_init_queue(nt, i); 585289544Scem } 586250079Scarl 587250079Scarl callout_init(&nt->link_work, 0); 588250079Scarl 589289546Scem rc = ntb_set_ctx(ntb, nt, &ntb_transport_ops); 590250079Scarl if (rc != 0) 591250079Scarl goto err; 592250079Scarl 593289546Scem nt->link_is_up = false; 594289546Scem ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); 595289546Scem ntb_link_event(ntb); 596250079Scarl return (0); 597250079Scarl 598250079Scarlerr: 599289545Scem free(nt->qp_vec, M_NTB_IF); 600289546Scem nt->qp_vec = NULL; 601250079Scarl return (rc); 602250079Scarl} 603250079Scarl 604250079Scarlstatic void 605289546Scemntb_transport_free(struct ntb_transport_ctx *nt) 606250079Scarl{ 607250079Scarl struct ntb_softc *ntb = nt->ntb; 608289546Scem struct _qpset qp_bitmap_alloc; 609289544Scem uint8_t i; 610250079Scarl 611289273Scem ntb_transport_link_cleanup(nt); 612250079Scarl 613250079Scarl callout_drain(&nt->link_work); 614250079Scarl 615289546Scem BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &qp_bitmap_alloc); 616289546Scem BIT_NAND(QP_SETSIZE, &qp_bitmap_alloc, &nt->qp_bitmap_free); 617289546Scem 618289546Scem /* Verify that all the QPs are freed */ 619289545Scem for (i = 0; i < nt->qp_count; i++) 620289546Scem if (test_bit(i, &qp_bitmap_alloc)) 621289545Scem ntb_transport_free_queue(&nt->qp_vec[i]); 622250079Scarl 623289546Scem ntb_link_disable(ntb); 624289546Scem ntb_clear_ctx(ntb); 625250079Scarl 626289546Scem for (i = 0; i < nt->mw_count; i++) 627289153Scem ntb_free_mw(nt, i); 628250079Scarl 629289545Scem free(nt->qp_vec, M_NTB_IF); 630250079Scarl} 631250079Scarl 632250079Scarlstatic void 633289545Scemntb_transport_init_queue(struct ntb_transport_ctx *nt, unsigned int qp_num) 634250079Scarl{ 635289546Scem struct ntb_transport_mw *mw; 636250079Scarl struct ntb_transport_qp *qp; 637289546Scem vm_paddr_t mw_base; 638289546Scem uint64_t mw_size, qp_offset; 639289546Scem size_t tx_size; 640289546Scem unsigned num_qps_mw, mw_num, mw_count; 641250079Scarl 642289546Scem mw_count = nt->mw_count; 643289545Scem mw_num = QP_TO_MW(nt, qp_num); 644289546Scem mw = &nt->mw_vec[mw_num]; 645289396Scem 646289545Scem qp = &nt->qp_vec[qp_num]; 647250079Scarl qp->qp_num = qp_num; 648250079Scarl qp->transport = nt; 649250079Scarl qp->ntb = nt->ntb; 650289545Scem qp->client_ready = false; 651250079Scarl qp->event_handler = NULL; 652289613Scem ntb_qp_link_down_reset(qp); 653250079Scarl 654289545Scem if (nt->qp_count % mw_count && mw_num + 1 < nt->qp_count / mw_count) 655289545Scem num_qps_mw = nt->qp_count / mw_count + 1; 656250079Scarl else 657289545Scem num_qps_mw = nt->qp_count / mw_count; 658250079Scarl 659289546Scem mw_base = mw->phys_addr; 660289546Scem mw_size = mw->phys_size; 661289546Scem 662289546Scem tx_size = mw_size / num_qps_mw; 663289546Scem qp_offset = tx_size * qp_num / mw_count; 664289546Scem 665289546Scem qp->tx_mw = (char *)mw->vbase + qp_offset; 666289546Scem KASSERT(qp->tx_mw != NULL, ("uh oh?")); 667289546Scem 668289546Scem /* XXX Assumes that a vm_paddr_t is equivalent to bus_addr_t */ 669289546Scem qp->tx_mw_phys = mw_base + qp_offset; 670289546Scem KASSERT(qp->tx_mw_phys != 0, ("uh oh?")); 671289546Scem 672250079Scarl tx_size -= sizeof(struct ntb_rx_info); 673289546Scem qp->rx_info = (void *)((char *)qp->tx_mw + tx_size); 674250079Scarl 675289156Scem /* Due to house-keeping, there must be at least 2 buffs */ 676289650Scem qp->tx_max_frame = qmin(tx_size / 2, 677289650Scem transport_mtu + sizeof(struct ntb_payload_header)); 678250079Scarl qp->tx_max_entry = tx_size / qp->tx_max_frame; 679250079Scarl 680250079Scarl callout_init(&qp->link_work, 0); 681283291Sjkim callout_init(&qp->queue_full, 1); 682283291Sjkim callout_init(&qp->rx_full, 1); 683250079Scarl 684250079Scarl mtx_init(&qp->ntb_rx_pend_q_lock, "ntb rx pend q", NULL, MTX_SPIN); 685250079Scarl mtx_init(&qp->ntb_rx_free_q_lock, "ntb rx free q", NULL, MTX_SPIN); 686250079Scarl mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN); 687289546Scem TASK_INIT(&qp->rx_completion_task, 0, ntb_complete_rxc, qp); 688289546Scem TASK_INIT(&qp->rxc_db_work, 0, ntb_transport_rxc_db, qp); 689250079Scarl 690250079Scarl STAILQ_INIT(&qp->rx_pend_q); 691250079Scarl STAILQ_INIT(&qp->rx_free_q); 692250079Scarl STAILQ_INIT(&qp->tx_free_q); 693250079Scarl} 694250079Scarl 695250079Scarlstatic void 696250079Scarlntb_transport_free_queue(struct ntb_transport_qp *qp) 697250079Scarl{ 698250079Scarl struct ntb_queue_entry *entry; 699250079Scarl 700250079Scarl if (qp == NULL) 701250079Scarl return; 702250079Scarl 703250079Scarl callout_drain(&qp->link_work); 704250079Scarl 705289546Scem ntb_db_set_mask(qp->ntb, 1ull << qp->qp_num); 706289546Scem taskqueue_drain(taskqueue_swi, &qp->rxc_db_work); 707289546Scem taskqueue_drain(taskqueue_swi, &qp->rx_completion_task); 708250079Scarl 709289546Scem qp->cb_data = NULL; 710289546Scem qp->rx_handler = NULL; 711289546Scem qp->tx_handler = NULL; 712289546Scem qp->event_handler = NULL; 713289546Scem 714250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 715250079Scarl free(entry, M_NTB_IF); 716250079Scarl 717250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) 718250079Scarl free(entry, M_NTB_IF); 719250079Scarl 720250079Scarl while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 721250079Scarl free(entry, M_NTB_IF); 722250079Scarl 723289546Scem set_bit(qp->qp_num, &qp->transport->qp_bitmap_free); 724250079Scarl} 725250079Scarl 726250079Scarl/** 727250079Scarl * ntb_transport_create_queue - Create a new NTB transport layer queue 728250079Scarl * @rx_handler: receive callback function 729250079Scarl * @tx_handler: transmit callback function 730250079Scarl * @event_handler: event callback function 731250079Scarl * 732250079Scarl * Create a new NTB transport layer queue and provide the queue with a callback 733250079Scarl * routine for both transmit and receive. The receive callback routine will be 734250079Scarl * used to pass up data when the transport has received it on the queue. The 735250079Scarl * transmit callback routine will be called when the transport has completed the 736250079Scarl * transmission of the data on the queue and the data is ready to be freed. 737250079Scarl * 738250079Scarl * RETURNS: pointer to newly created ntb_queue, NULL on error. 739250079Scarl */ 740250079Scarlstatic struct ntb_transport_qp * 741289546Scemntb_transport_create_queue(void *data, struct ntb_softc *ntb, 742250079Scarl const struct ntb_queue_handlers *handlers) 743250079Scarl{ 744250079Scarl struct ntb_queue_entry *entry; 745250079Scarl struct ntb_transport_qp *qp; 746289545Scem struct ntb_transport_ctx *nt; 747250079Scarl unsigned int free_queue; 748289546Scem int i; 749250079Scarl 750289546Scem nt = ntb_get_ctx(ntb, NULL); 751289546Scem KASSERT(nt != NULL, ("bogus")); 752250079Scarl 753289544Scem free_queue = ffs_bit(&nt->qp_bitmap); 754250079Scarl if (free_queue == 0) 755289546Scem return (NULL); 756250079Scarl 757250079Scarl /* decrement free_queue to make it zero based */ 758250079Scarl free_queue--; 759250079Scarl 760289545Scem qp = &nt->qp_vec[free_queue]; 761289546Scem clear_bit(1ull << qp->qp_num, &nt->qp_bitmap_free); 762250079Scarl qp->cb_data = data; 763250079Scarl qp->rx_handler = handlers->rx_handler; 764250079Scarl qp->tx_handler = handlers->tx_handler; 765250079Scarl qp->event_handler = handlers->event_handler; 766250079Scarl 767250079Scarl for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 768289546Scem entry = malloc(sizeof(*entry), M_NTB_IF, M_WAITOK | M_ZERO); 769250079Scarl entry->cb_data = nt->ifp; 770250079Scarl entry->buf = NULL; 771250079Scarl entry->len = transport_mtu; 772250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 773250079Scarl } 774250079Scarl 775250079Scarl for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 776289546Scem entry = malloc(sizeof(*entry), M_NTB_IF, M_WAITOK | M_ZERO); 777250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 778250079Scarl } 779250079Scarl 780289546Scem ntb_db_clear(ntb, 1ull << qp->qp_num); 781289546Scem ntb_db_clear_mask(ntb, 1ull << qp->qp_num); 782250079Scarl return (qp); 783250079Scarl} 784250079Scarl 785250079Scarl/** 786250079Scarl * ntb_transport_link_up - Notify NTB transport of client readiness to use queue 787250079Scarl * @qp: NTB transport layer queue to be enabled 788250079Scarl * 789250079Scarl * Notify NTB transport layer of client readiness to use queue 790250079Scarl */ 791250079Scarlstatic void 792250079Scarlntb_transport_link_up(struct ntb_transport_qp *qp) 793250079Scarl{ 794250079Scarl 795250079Scarl if (qp == NULL) 796250079Scarl return; 797250079Scarl 798289545Scem qp->client_ready = true; 799255268Scarl if (bootverbose) 800289649Scem if_printf(qp->transport->ifp, "qp client ready\n"); 801250079Scarl 802289545Scem if (qp->transport->link_is_up) 803250079Scarl callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 804250079Scarl} 805250079Scarl 806250079Scarl 807250079Scarl 808250079Scarl/* Transport Tx */ 809250079Scarl 810250079Scarl/** 811250079Scarl * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry 812250079Scarl * @qp: NTB transport layer queue the entry is to be enqueued on 813250079Scarl * @cb: per buffer pointer for callback function to use 814250079Scarl * @data: pointer to data buffer that will be sent 815250079Scarl * @len: length of the data buffer 816250079Scarl * 817250079Scarl * Enqueue a new transmit buffer onto the transport queue from which a NTB 818289266Scem * payload will be transmitted. This assumes that a lock is being held to 819250079Scarl * serialize access to the qp. 820250079Scarl * 821250079Scarl * RETURNS: An appropriate ERRNO error value on error, or zero for success. 822250079Scarl */ 823250079Scarlstatic int 824250079Scarlntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, 825250079Scarl unsigned int len) 826250079Scarl{ 827250079Scarl struct ntb_queue_entry *entry; 828250079Scarl int rc; 829250079Scarl 830289545Scem if (qp == NULL || !qp->link_is_up || len == 0) { 831250079Scarl CTR0(KTR_NTB, "TX: link not up"); 832250079Scarl return (EINVAL); 833250079Scarl } 834250079Scarl 835250079Scarl entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 836250079Scarl if (entry == NULL) { 837255281Scarl CTR0(KTR_NTB, "TX: could not get entry from tx_free_q"); 838250079Scarl return (ENOMEM); 839250079Scarl } 840250079Scarl CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry); 841250079Scarl 842250079Scarl entry->cb_data = cb; 843250079Scarl entry->buf = data; 844250079Scarl entry->len = len; 845250079Scarl entry->flags = 0; 846250079Scarl 847250079Scarl rc = ntb_process_tx(qp, entry); 848250079Scarl if (rc != 0) { 849250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 850250079Scarl CTR1(KTR_NTB, 851250079Scarl "TX: process_tx failed. Returning entry %p to tx_free_q", 852250079Scarl entry); 853250079Scarl } 854250079Scarl return (rc); 855250079Scarl} 856250079Scarl 857250079Scarlstatic int 858250079Scarlntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry) 859250079Scarl{ 860250079Scarl void *offset; 861250079Scarl 862250079Scarl offset = (char *)qp->tx_mw + qp->tx_max_frame * qp->tx_index; 863250079Scarl CTR3(KTR_NTB, 864250079Scarl "TX: process_tx: tx_pkts=%u, tx_index=%u, remote entry=%u", 865250079Scarl qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry); 866250079Scarl if (qp->tx_index == qp->remote_rx_info->entry) { 867250079Scarl CTR0(KTR_NTB, "TX: ring full"); 868250079Scarl qp->tx_ring_full++; 869250079Scarl return (EAGAIN); 870250079Scarl } 871250079Scarl 872250079Scarl if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { 873250079Scarl if (qp->tx_handler != NULL) 874250079Scarl qp->tx_handler(qp, qp->cb_data, entry->buf, 875250079Scarl EIO); 876250079Scarl 877250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 878250079Scarl CTR1(KTR_NTB, 879250079Scarl "TX: frame too big. returning entry %p to tx_free_q", 880250079Scarl entry); 881250079Scarl return (0); 882250079Scarl } 883250079Scarl CTR2(KTR_NTB, "TX: copying entry %p to offset %p", entry, offset); 884289546Scem ntb_memcpy_tx(qp, entry, offset); 885250079Scarl 886250079Scarl qp->tx_index++; 887250079Scarl qp->tx_index %= qp->tx_max_entry; 888250079Scarl 889250079Scarl qp->tx_pkts++; 890250079Scarl 891250079Scarl return (0); 892250079Scarl} 893250079Scarl 894250079Scarlstatic void 895289546Scemntb_memcpy_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 896250079Scarl void *offset) 897250079Scarl{ 898250079Scarl struct ntb_payload_header *hdr; 899250079Scarl 900289546Scem /* This piece is from Linux' ntb_async_tx() */ 901250079Scarl hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame - 902250079Scarl sizeof(struct ntb_payload_header)); 903289546Scem entry->x_hdr = hdr; 904250079Scarl hdr->len = entry->len; /* TODO: replace with bus_space_write */ 905250079Scarl hdr->ver = qp->tx_pkts; /* TODO: replace with bus_space_write */ 906289546Scem 907289546Scem /* This piece is ntb_memcpy_tx() */ 908289546Scem CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset); 909289546Scem if (entry->buf != NULL) { 910289546Scem m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset); 911289546Scem 912289546Scem /* 913289546Scem * Ensure that the data is fully copied before setting the 914289546Scem * flags 915289546Scem */ 916289546Scem wmb(); 917289546Scem } 918289546Scem 919289546Scem /* The rest is ntb_tx_copy_callback() */ 920250079Scarl /* TODO: replace with bus_space_write */ 921250079Scarl hdr->flags = entry->flags | IF_NTB_DESC_DONE_FLAG; 922250079Scarl 923289545Scem ntb_peer_db_set(qp->ntb, 1ull << qp->qp_num); 924250079Scarl 925289341Scem /* 926250079Scarl * The entry length can only be zero if the packet is intended to be a 927250079Scarl * "link down" or similar. Since no payload is being sent in these 928250079Scarl * cases, there is nothing to add to the completion queue. 929250079Scarl */ 930250079Scarl if (entry->len > 0) { 931250079Scarl qp->tx_bytes += entry->len; 932250079Scarl 933250079Scarl if (qp->tx_handler) 934250079Scarl qp->tx_handler(qp, qp->cb_data, entry->cb_data, 935250079Scarl entry->len); 936250079Scarl } 937250079Scarl 938250079Scarl CTR2(KTR_NTB, 939250079Scarl "TX: entry %p sent. hdr->ver = %d, Returning to tx_free_q", entry, 940250079Scarl hdr->ver); 941250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 942250079Scarl} 943250079Scarl 944250079Scarlstatic void 945250079Scarlntb_qp_full(void *arg) 946250079Scarl{ 947250079Scarl 948250079Scarl CTR0(KTR_NTB, "TX: qp_full callout"); 949250079Scarl ntb_start(arg); 950250079Scarl} 951250079Scarl 952250079Scarl/* Transport Rx */ 953250079Scarlstatic void 954250079Scarlntb_rx_pendq_full(void *arg) 955250079Scarl{ 956250079Scarl 957250079Scarl CTR0(KTR_NTB, "RX: ntb_rx_pendq_full callout"); 958289281Scem ntb_transport_rxc_db(arg, 0); 959250079Scarl} 960250079Scarl 961289546Scemstatic void 962289546Scemntb_transport_rxc_db(void *arg, int pending __unused) 963250079Scarl{ 964289281Scem struct ntb_transport_qp *qp = arg; 965289157Scem uint64_t i; 966289157Scem int rc; 967250079Scarl 968289341Scem /* 969250079Scarl * Limit the number of packets processed in a single interrupt to 970250079Scarl * provide fairness to others 971250079Scarl */ 972289546Scem CTR0(KTR_NTB, "RX: transport_rx"); 973250079Scarl mtx_lock(&qp->transport->rx_lock); 974289546Scem for (i = 0; i < qp->rx_max_entry; i++) { 975250079Scarl rc = ntb_process_rxc(qp); 976250079Scarl if (rc != 0) { 977250079Scarl CTR0(KTR_NTB, "RX: process_rxc failed"); 978250079Scarl break; 979250079Scarl } 980250079Scarl } 981250079Scarl mtx_unlock(&qp->transport->rx_lock); 982289281Scem 983289546Scem if (i == qp->rx_max_entry) 984289546Scem taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 985289546Scem else if ((ntb_db_read(qp->ntb) & (1ull << qp->qp_num)) != 0) { 986289546Scem /* If db is set, clear it and read it back to commit clear. */ 987289546Scem ntb_db_clear(qp->ntb, 1ull << qp->qp_num); 988289546Scem (void)ntb_db_read(qp->ntb); 989289546Scem 990289546Scem /* 991289546Scem * An interrupt may have arrived between finishing 992289546Scem * ntb_process_rxc and clearing the doorbell bit: there might 993289546Scem * be some more work to do. 994289546Scem */ 995289546Scem taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 996289546Scem } 997250079Scarl} 998250079Scarl 999250079Scarlstatic int 1000250079Scarlntb_process_rxc(struct ntb_transport_qp *qp) 1001250079Scarl{ 1002250079Scarl struct ntb_payload_header *hdr; 1003250079Scarl struct ntb_queue_entry *entry; 1004250079Scarl void *offset; 1005250079Scarl 1006250079Scarl offset = (void *) 1007250079Scarl ((char *)qp->rx_buff + qp->rx_max_frame * qp->rx_index); 1008250079Scarl hdr = (void *) 1009250079Scarl ((char *)offset + qp->rx_max_frame - 1010250079Scarl sizeof(struct ntb_payload_header)); 1011250079Scarl 1012250079Scarl CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index); 1013250079Scarl if ((hdr->flags & IF_NTB_DESC_DONE_FLAG) == 0) { 1014289546Scem CTR0(KTR_NTB, "RX: hdr not done"); 1015250079Scarl qp->rx_ring_empty++; 1016250079Scarl return (EAGAIN); 1017250079Scarl } 1018250079Scarl 1019289546Scem if ((hdr->flags & IF_NTB_LINK_DOWN_FLAG) != 0) { 1020289546Scem CTR0(KTR_NTB, "RX: link down"); 1021289546Scem ntb_qp_link_down(qp); 1022289546Scem hdr->flags = 0; 1023289546Scem return (EAGAIN); 1024289546Scem } 1025289546Scem 1026289546Scem if (hdr->ver != (uint32_t)qp->rx_pkts) { 1027289546Scem CTR2(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). " 1028289546Scem "Returning entry %p to rx_pend_q", hdr->ver, qp->rx_pkts); 1029250079Scarl qp->rx_err_ver++; 1030250079Scarl return (EIO); 1031250079Scarl } 1032250079Scarl 1033289546Scem entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); 1034289546Scem if (entry == NULL) { 1035289546Scem qp->rx_err_no_buf++; 1036289546Scem CTR0(KTR_NTB, "RX: No entries in rx_pend_q"); 1037289546Scem return (EAGAIN); 1038250079Scarl } 1039289546Scem callout_stop(&qp->rx_full); 1040289546Scem CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry); 1041250079Scarl 1042289546Scem entry->x_hdr = hdr; 1043289546Scem entry->index = qp->rx_index; 1044250079Scarl 1045289546Scem if (hdr->len > entry->len) { 1046289546Scem CTR2(KTR_NTB, "RX: len too long. Wanted %ju got %ju", 1047289546Scem (uintmax_t)hdr->len, (uintmax_t)entry->len); 1048250079Scarl qp->rx_err_oflow++; 1049250079Scarl 1050289546Scem entry->len = -EIO; 1051289546Scem entry->flags |= IF_NTB_DESC_DONE_FLAG; 1052250079Scarl 1053289546Scem ntb_list_add(&qp->ntb_rx_free_q_lock, entry, &qp->rx_free_q); 1054289546Scem taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 1055289546Scem } else { 1056289546Scem qp->rx_bytes += hdr->len; 1057289546Scem qp->rx_pkts++; 1058250079Scarl 1059289546Scem CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts); 1060250079Scarl 1061289546Scem entry->len = hdr->len; 1062289546Scem 1063289546Scem ntb_rx_copy_task(qp, entry, offset); 1064289546Scem } 1065289546Scem 1066250079Scarl qp->rx_index++; 1067250079Scarl qp->rx_index %= qp->rx_max_entry; 1068250079Scarl return (0); 1069250079Scarl} 1070250079Scarl 1071250079Scarlstatic void 1072250079Scarlntb_rx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 1073250079Scarl void *offset) 1074250079Scarl{ 1075250079Scarl struct ifnet *ifp = entry->cb_data; 1076250079Scarl unsigned int len = entry->len; 1077250079Scarl struct mbuf *m; 1078250079Scarl 1079250079Scarl CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset); 1080250079Scarl m = m_devget(offset, len, 0, ifp, NULL); 1081250079Scarl m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID; 1082250079Scarl 1083250079Scarl entry->buf = (void *)m; 1084250079Scarl 1085289546Scem /* Ensure that the data is globally visible before clearing the flag */ 1086289546Scem wmb(); 1087289546Scem entry->x_hdr->flags = 0; 1088289546Scem /* TODO: replace with bus_space_write */ 1089289546Scem qp->rx_info->entry = qp->rx_index; 1090289546Scem 1091250079Scarl CTR2(KTR_NTB, 1092250079Scarl "RX: copied entry %p to mbuf %p. Adding entry to rx_free_q", entry, 1093250079Scarl m); 1094250079Scarl ntb_list_add(&qp->ntb_rx_free_q_lock, entry, &qp->rx_free_q); 1095250079Scarl 1096250079Scarl taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 1097250079Scarl} 1098250079Scarl 1099250079Scarlstatic void 1100289546Scemntb_complete_rxc(void *arg, int pending) 1101250079Scarl{ 1102250079Scarl struct ntb_transport_qp *qp = arg; 1103250079Scarl struct mbuf *m; 1104250079Scarl struct ntb_queue_entry *entry; 1105250079Scarl 1106250079Scarl CTR0(KTR_NTB, "RX: rx_completion_task"); 1107250079Scarl 1108250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) { 1109250079Scarl m = entry->buf; 1110250079Scarl CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m); 1111289545Scem if (qp->rx_handler && qp->client_ready) 1112250079Scarl qp->rx_handler(qp, qp->cb_data, m, entry->len); 1113250079Scarl 1114250079Scarl entry->buf = NULL; 1115250079Scarl entry->len = qp->transport->bufsize; 1116250079Scarl 1117250079Scarl CTR1(KTR_NTB,"RX: entry %p removed from rx_free_q " 1118250079Scarl "and added to rx_pend_q", entry); 1119250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 1120250079Scarl if (qp->rx_err_no_buf > qp->last_rx_no_buf) { 1121250079Scarl qp->last_rx_no_buf = qp->rx_err_no_buf; 1122250079Scarl CTR0(KTR_NTB, "RX: could spawn rx task"); 1123250079Scarl callout_reset(&qp->rx_full, hz / 1000, ntb_rx_pendq_full, 1124250079Scarl qp); 1125250079Scarl } 1126250079Scarl } 1127250079Scarl} 1128250079Scarl 1129289546Scemstatic void 1130289598Scemntb_transport_doorbell_callback(void *data, uint32_t vector) 1131289546Scem{ 1132289546Scem struct ntb_transport_ctx *nt = data; 1133289546Scem struct ntb_transport_qp *qp; 1134289546Scem struct _qpset db_bits; 1135289546Scem uint64_t vec_mask; 1136289546Scem unsigned qp_num; 1137289546Scem 1138289546Scem BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &db_bits); 1139289546Scem BIT_NAND(QP_SETSIZE, &db_bits, &nt->qp_bitmap_free); 1140289546Scem 1141289546Scem vec_mask = ntb_db_vector_mask(nt->ntb, vector); 1142289546Scem while (vec_mask != 0) { 1143289546Scem qp_num = ffsl(vec_mask); 1144289546Scem /* i386 doesn't have ffsll(), fake it */ 1145289546Scem if (qp_num == 0) { 1146289546Scem qp_num = ffsl(vec_mask >> 32); 1147289546Scem KASSERT(qp_num != 0, ("ffs")); 1148289546Scem qp_num += 32; 1149289546Scem } 1150289546Scem qp_num--; 1151289546Scem 1152289546Scem if (test_bit(qp_num, &db_bits)) { 1153289546Scem qp = &nt->qp_vec[qp_num]; 1154289546Scem taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1155289546Scem } 1156289546Scem 1157289546Scem vec_mask &= ~(1ull << qp_num); 1158289546Scem } 1159289546Scem} 1160289546Scem 1161250079Scarl/* Link Event handler */ 1162250079Scarlstatic void 1163289546Scemntb_transport_event_callback(void *data) 1164250079Scarl{ 1165289545Scem struct ntb_transport_ctx *nt = data; 1166250079Scarl 1167289546Scem if (ntb_link_is_up(nt->ntb, NULL, NULL)) { 1168255268Scarl if (bootverbose) 1169289649Scem if_printf(nt->ifp, "HW link up\n"); 1170250079Scarl callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 1171289546Scem } else { 1172255268Scarl if (bootverbose) 1173289649Scem if_printf(nt->ifp, "HW link down\n"); 1174250079Scarl ntb_transport_link_cleanup(nt); 1175250079Scarl } 1176250079Scarl} 1177250079Scarl 1178250079Scarl/* Link bring up */ 1179250079Scarlstatic void 1180250079Scarlntb_transport_link_work(void *arg) 1181250079Scarl{ 1182289545Scem struct ntb_transport_ctx *nt = arg; 1183250079Scarl struct ntb_softc *ntb = nt->ntb; 1184250079Scarl struct ntb_transport_qp *qp; 1185289546Scem uint64_t val64, size; 1186289546Scem uint32_t val; 1187289546Scem unsigned i; 1188289208Scem int rc; 1189250079Scarl 1190289153Scem /* send the local info, in the opposite order of the way we read it */ 1191289546Scem for (i = 0; i < nt->mw_count; i++) { 1192289546Scem size = nt->mw_vec[i].phys_size; 1193250079Scarl 1194289546Scem if (max_mw_size != 0 && size > max_mw_size) 1195289546Scem size = max_mw_size; 1196289546Scem 1197289546Scem ntb_peer_spad_write(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1198289546Scem size >> 32); 1199289546Scem ntb_peer_spad_write(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), size); 1200289153Scem } 1201250079Scarl 1202289546Scem ntb_peer_spad_write(ntb, IF_NTB_NUM_MWS, nt->mw_count); 1203250079Scarl 1204289546Scem ntb_peer_spad_write(ntb, IF_NTB_NUM_QPS, nt->qp_count); 1205250079Scarl 1206289546Scem ntb_peer_spad_write(ntb, IF_NTB_VERSION, NTB_TRANSPORT_VERSION); 1207250079Scarl 1208250079Scarl /* Query the remote side for its info */ 1209289546Scem val = 0; 1210289546Scem ntb_spad_read(ntb, IF_NTB_VERSION, &val); 1211250079Scarl if (val != NTB_TRANSPORT_VERSION) 1212250079Scarl goto out; 1213250079Scarl 1214289546Scem ntb_spad_read(ntb, IF_NTB_NUM_QPS, &val); 1215289545Scem if (val != nt->qp_count) 1216250079Scarl goto out; 1217250079Scarl 1218289546Scem ntb_spad_read(ntb, IF_NTB_NUM_MWS, &val); 1219289546Scem if (val != nt->mw_count) 1220250079Scarl goto out; 1221250079Scarl 1222289546Scem for (i = 0; i < nt->mw_count; i++) { 1223289546Scem ntb_spad_read(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), &val); 1224289153Scem val64 = (uint64_t)val << 32; 1225250079Scarl 1226289546Scem ntb_spad_read(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), &val); 1227289153Scem val64 |= val; 1228250079Scarl 1229289153Scem rc = ntb_set_mw(nt, i, val64); 1230289153Scem if (rc != 0) 1231289153Scem goto free_mws; 1232289153Scem } 1233289153Scem 1234289545Scem nt->link_is_up = true; 1235255268Scarl if (bootverbose) 1236289649Scem if_printf(nt->ifp, "transport link up\n"); 1237250079Scarl 1238289545Scem for (i = 0; i < nt->qp_count; i++) { 1239289545Scem qp = &nt->qp_vec[i]; 1240250079Scarl 1241250079Scarl ntb_transport_setup_qp_mw(nt, i); 1242250079Scarl 1243289545Scem if (qp->client_ready) 1244250079Scarl callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 1245250079Scarl } 1246250079Scarl 1247250079Scarl return; 1248250079Scarl 1249289153Scemfree_mws: 1250289546Scem for (i = 0; i < nt->mw_count; i++) 1251289153Scem ntb_free_mw(nt, i); 1252250079Scarlout: 1253289546Scem if (ntb_link_is_up(ntb, NULL, NULL)) 1254250079Scarl callout_reset(&nt->link_work, 1255289153Scem NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt); 1256250079Scarl} 1257250079Scarl 1258250079Scarlstatic int 1259289546Scemntb_set_mw(struct ntb_transport_ctx *nt, int num_mw, unsigned size) 1260250079Scarl{ 1261289545Scem struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; 1262289546Scem unsigned xlat_size, buff_size; 1263289546Scem int rc; 1264250079Scarl 1265289546Scem xlat_size = roundup(size, mw->xlat_align_size); 1266289546Scem buff_size = roundup(size, mw->xlat_align); 1267289546Scem 1268289154Scem /* No need to re-setup */ 1269289546Scem if (mw->xlat_size == xlat_size) 1270289154Scem return (0); 1271289154Scem 1272289546Scem if (mw->buff_size != 0) 1273289154Scem ntb_free_mw(nt, num_mw); 1274289154Scem 1275289546Scem /* Alloc memory for receiving data. Must be aligned */ 1276289546Scem mw->xlat_size = xlat_size; 1277289546Scem mw->buff_size = buff_size; 1278250079Scarl 1279289546Scem mw->virt_addr = contigmalloc(mw->buff_size, M_NTB_IF, M_ZERO, 0, 1280289546Scem BUS_SPACE_MAXADDR, mw->xlat_align, 0); 1281250079Scarl if (mw->virt_addr == NULL) { 1282289545Scem mw->xlat_size = 0; 1283289546Scem mw->buff_size = 0; 1284289346Scem printf("ntb: Unable to allocate MW buffer of size %zu\n", 1285289545Scem mw->xlat_size); 1286250079Scarl return (ENOMEM); 1287250079Scarl } 1288250079Scarl /* TODO: replace with bus_space_* functions */ 1289250079Scarl mw->dma_addr = vtophys(mw->virt_addr); 1290250079Scarl 1291289346Scem /* 1292289346Scem * Ensure that the allocation from contigmalloc is aligned as 1293289346Scem * requested. XXX: This may not be needed -- brought in for parity 1294289346Scem * with the Linux driver. 1295289346Scem */ 1296289546Scem if (mw->dma_addr % mw->xlat_align != 0) { 1297289649Scem if_printf(nt->ifp, 1298289346Scem "DMA memory 0x%jx not aligned to BAR size 0x%x\n", 1299289346Scem (uintmax_t)mw->dma_addr, size); 1300289346Scem ntb_free_mw(nt, num_mw); 1301289346Scem return (ENOMEM); 1302289346Scem } 1303289346Scem 1304250079Scarl /* Notify HW the memory location of the receive buffer */ 1305289546Scem rc = ntb_mw_set_trans(nt->ntb, num_mw, mw->dma_addr, mw->xlat_size); 1306289546Scem if (rc) { 1307289649Scem if_printf(nt->ifp, "Unable to set mw%d translation", num_mw); 1308289546Scem ntb_free_mw(nt, num_mw); 1309289546Scem return (rc); 1310289546Scem } 1311250079Scarl 1312250079Scarl return (0); 1313250079Scarl} 1314250079Scarl 1315250079Scarlstatic void 1316289545Scemntb_free_mw(struct ntb_transport_ctx *nt, int num_mw) 1317289153Scem{ 1318289545Scem struct ntb_transport_mw *mw = &nt->mw_vec[num_mw]; 1319289153Scem 1320289153Scem if (mw->virt_addr == NULL) 1321289153Scem return; 1322289153Scem 1323289546Scem ntb_mw_clear_trans(nt->ntb, num_mw); 1324289545Scem contigfree(mw->virt_addr, mw->xlat_size, M_NTB_IF); 1325289546Scem mw->xlat_size = 0; 1326289546Scem mw->buff_size = 0; 1327289153Scem mw->virt_addr = NULL; 1328289153Scem} 1329289153Scem 1330289546Scemstatic int 1331289545Scemntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt, unsigned int qp_num) 1332250079Scarl{ 1333289545Scem struct ntb_transport_qp *qp = &nt->qp_vec[qp_num]; 1334289546Scem struct ntb_transport_mw *mw; 1335250079Scarl void *offset; 1336289546Scem uint64_t i; 1337289546Scem size_t rx_size; 1338289546Scem unsigned num_qps_mw, mw_num, mw_count; 1339250079Scarl 1340289546Scem mw_count = nt->mw_count; 1341289545Scem mw_num = QP_TO_MW(nt, qp_num); 1342289546Scem mw = &nt->mw_vec[mw_num]; 1343289396Scem 1344289546Scem if (mw->virt_addr == NULL) 1345289546Scem return (ENOMEM); 1346289546Scem 1347289545Scem if (nt->qp_count % mw_count && mw_num + 1 < nt->qp_count / mw_count) 1348289545Scem num_qps_mw = nt->qp_count / mw_count + 1; 1349250079Scarl else 1350289545Scem num_qps_mw = nt->qp_count / mw_count; 1351250079Scarl 1352289546Scem rx_size = mw->xlat_size / num_qps_mw; 1353289546Scem qp->rx_buff = (char *)mw->virt_addr + rx_size * qp_num / mw_count; 1354250079Scarl rx_size -= sizeof(struct ntb_rx_info); 1355250079Scarl 1356289546Scem qp->remote_rx_info = (void*)((char *)qp->rx_buff + rx_size); 1357289546Scem 1358289156Scem /* Due to house-keeping, there must be at least 2 buffs */ 1359289650Scem qp->rx_max_frame = qmin(rx_size / 2, 1360289650Scem transport_mtu + sizeof(struct ntb_payload_header)); 1361250079Scarl qp->rx_max_entry = rx_size / qp->rx_max_frame; 1362250079Scarl qp->rx_index = 0; 1363250079Scarl 1364289156Scem qp->remote_rx_info->entry = qp->rx_max_entry - 1; 1365250079Scarl 1366289546Scem /* Set up the hdr offsets with 0s */ 1367250079Scarl for (i = 0; i < qp->rx_max_entry; i++) { 1368250079Scarl offset = (void *)((uint8_t *)qp->rx_buff + 1369250079Scarl qp->rx_max_frame * (i + 1) - 1370250079Scarl sizeof(struct ntb_payload_header)); 1371250079Scarl memset(offset, 0, sizeof(struct ntb_payload_header)); 1372250079Scarl } 1373250079Scarl 1374250079Scarl qp->rx_pkts = 0; 1375250079Scarl qp->tx_pkts = 0; 1376289155Scem qp->tx_index = 0; 1377289546Scem 1378289546Scem return (0); 1379250079Scarl} 1380250079Scarl 1381250079Scarlstatic void 1382250079Scarlntb_qp_link_work(void *arg) 1383250079Scarl{ 1384250079Scarl struct ntb_transport_qp *qp = arg; 1385250079Scarl struct ntb_softc *ntb = qp->ntb; 1386289545Scem struct ntb_transport_ctx *nt = qp->transport; 1387289615Scem uint32_t val, dummy; 1388250079Scarl 1389289546Scem ntb_spad_read(ntb, IF_NTB_QP_LINKS, &val); 1390250079Scarl 1391289546Scem ntb_peer_spad_write(ntb, IF_NTB_QP_LINKS, val | (1ull << qp->qp_num)); 1392250079Scarl 1393250079Scarl /* query remote spad for qp ready bits */ 1394289615Scem ntb_peer_spad_read(ntb, IF_NTB_QP_LINKS, &dummy); 1395250079Scarl 1396250079Scarl /* See if the remote side is up */ 1397289546Scem if ((val & (1ull << qp->qp_num)) != 0) { 1398289546Scem if (bootverbose) 1399289649Scem if_printf(nt->ifp, "qp link up\n"); 1400289545Scem qp->link_is_up = true; 1401289546Scem 1402250079Scarl if (qp->event_handler != NULL) 1403250079Scarl qp->event_handler(qp->cb_data, NTB_LINK_UP); 1404289546Scem 1405289546Scem taskqueue_enqueue(taskqueue_swi, &qp->rxc_db_work); 1406289546Scem } else if (nt->link_is_up) 1407250079Scarl callout_reset(&qp->link_work, 1408250079Scarl NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1409250079Scarl} 1410250079Scarl 1411250079Scarl/* Link down event*/ 1412250079Scarlstatic void 1413289545Scemntb_transport_link_cleanup(struct ntb_transport_ctx *nt) 1414250079Scarl{ 1415289546Scem struct ntb_transport_qp *qp; 1416289546Scem struct _qpset qp_bitmap_alloc; 1417289546Scem unsigned i; 1418250079Scarl 1419289546Scem BIT_COPY(QP_SETSIZE, &nt->qp_bitmap, &qp_bitmap_alloc); 1420289546Scem BIT_NAND(QP_SETSIZE, &qp_bitmap_alloc, &nt->qp_bitmap_free); 1421289546Scem 1422289273Scem /* Pass along the info to any clients */ 1423289545Scem for (i = 0; i < nt->qp_count; i++) 1424289546Scem if (test_bit(i, &qp_bitmap_alloc)) { 1425289546Scem qp = &nt->qp_vec[i]; 1426289546Scem ntb_qp_link_cleanup(qp); 1427289546Scem callout_drain(&qp->link_work); 1428289546Scem } 1429289273Scem 1430289545Scem if (!nt->link_is_up) 1431250079Scarl callout_drain(&nt->link_work); 1432250079Scarl 1433289341Scem /* 1434250079Scarl * The scratchpad registers keep the values if the remote side 1435250079Scarl * goes down, blast them now to give them a sane value the next 1436250079Scarl * time they are accessed 1437250079Scarl */ 1438250079Scarl for (i = 0; i < IF_NTB_MAX_SPAD; i++) 1439289545Scem ntb_spad_write(nt->ntb, i, 0); 1440250079Scarl} 1441250079Scarl 1442250079Scarl 1443250079Scarlstatic void 1444250079Scarlntb_qp_link_down(struct ntb_transport_qp *qp) 1445250079Scarl{ 1446250079Scarl 1447250079Scarl ntb_qp_link_cleanup(qp); 1448250079Scarl} 1449250079Scarl 1450250079Scarlstatic void 1451289613Scemntb_qp_link_down_reset(struct ntb_transport_qp *qp) 1452289613Scem{ 1453289613Scem 1454289613Scem qp->link_is_up = false; 1455289613Scem 1456289613Scem qp->tx_index = qp->rx_index = 0; 1457289613Scem qp->tx_bytes = qp->rx_bytes = 0; 1458289613Scem qp->tx_pkts = qp->rx_pkts = 0; 1459289613Scem 1460289613Scem qp->rx_ring_empty = 0; 1461289613Scem qp->tx_ring_full = 0; 1462289613Scem 1463289613Scem qp->rx_err_no_buf = qp->rx_err_oflow = qp->rx_err_ver = 0; 1464289613Scem} 1465289613Scem 1466289613Scemstatic void 1467250079Scarlntb_qp_link_cleanup(struct ntb_transport_qp *qp) 1468250079Scarl{ 1469289545Scem struct ntb_transport_ctx *nt = qp->transport; 1470250079Scarl 1471289613Scem callout_drain(&qp->link_work); 1472289613Scem ntb_qp_link_down_reset(qp); 1473250079Scarl 1474250079Scarl if (qp->event_handler != NULL) 1475250079Scarl qp->event_handler(qp->cb_data, NTB_LINK_DOWN); 1476250079Scarl 1477289545Scem if (nt->link_is_up) 1478250079Scarl callout_reset(&qp->link_work, 1479250079Scarl NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1480250079Scarl} 1481250079Scarl 1482250079Scarl/* Link commanded down */ 1483250079Scarl/** 1484250079Scarl * ntb_transport_link_down - Notify NTB transport to no longer enqueue data 1485250079Scarl * @qp: NTB transport layer queue to be disabled 1486250079Scarl * 1487250079Scarl * Notify NTB transport layer of client's desire to no longer receive data on 1488250079Scarl * transport queue specified. It is the client's responsibility to ensure all 1489289266Scem * entries on queue are purged or otherwise handled appropriately. 1490250079Scarl */ 1491250079Scarlstatic void 1492250079Scarlntb_transport_link_down(struct ntb_transport_qp *qp) 1493250079Scarl{ 1494289546Scem uint32_t val; 1495250079Scarl 1496250079Scarl if (qp == NULL) 1497250079Scarl return; 1498250079Scarl 1499289545Scem qp->client_ready = false; 1500250079Scarl 1501289546Scem ntb_spad_read(qp->ntb, IF_NTB_QP_LINKS, &val); 1502250079Scarl 1503289546Scem ntb_peer_spad_write(qp->ntb, IF_NTB_QP_LINKS, 1504250079Scarl val & ~(1 << qp->qp_num)); 1505250079Scarl 1506289545Scem if (qp->link_is_up) 1507250079Scarl ntb_send_link_down(qp); 1508250079Scarl else 1509250079Scarl callout_drain(&qp->link_work); 1510250079Scarl} 1511250079Scarl 1512250079Scarlstatic void 1513250079Scarlntb_send_link_down(struct ntb_transport_qp *qp) 1514250079Scarl{ 1515250079Scarl struct ntb_queue_entry *entry; 1516250079Scarl int i, rc; 1517250079Scarl 1518289545Scem if (!qp->link_is_up) 1519250079Scarl return; 1520250079Scarl 1521250079Scarl for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { 1522250079Scarl entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 1523250079Scarl if (entry != NULL) 1524250079Scarl break; 1525250079Scarl pause("NTB Wait for link down", hz / 10); 1526250079Scarl } 1527250079Scarl 1528250079Scarl if (entry == NULL) 1529250079Scarl return; 1530250079Scarl 1531250079Scarl entry->cb_data = NULL; 1532250079Scarl entry->buf = NULL; 1533250079Scarl entry->len = 0; 1534250079Scarl entry->flags = IF_NTB_LINK_DOWN_FLAG; 1535250079Scarl 1536250079Scarl mtx_lock(&qp->transport->tx_lock); 1537250079Scarl rc = ntb_process_tx(qp, entry); 1538250079Scarl if (rc != 0) 1539250079Scarl printf("ntb: Failed to send link down\n"); 1540250079Scarl mtx_unlock(&qp->transport->tx_lock); 1541289613Scem 1542289613Scem ntb_qp_link_down_reset(qp); 1543250079Scarl} 1544250079Scarl 1545250079Scarl 1546250079Scarl/* List Management */ 1547250079Scarl 1548250079Scarlstatic void 1549250079Scarlntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 1550250079Scarl struct ntb_queue_list *list) 1551250079Scarl{ 1552250079Scarl 1553250079Scarl mtx_lock_spin(lock); 1554250079Scarl STAILQ_INSERT_TAIL(list, entry, entry); 1555250079Scarl mtx_unlock_spin(lock); 1556250079Scarl} 1557250079Scarl 1558250079Scarlstatic struct ntb_queue_entry * 1559250079Scarlntb_list_rm(struct mtx *lock, struct ntb_queue_list *list) 1560250079Scarl{ 1561250079Scarl struct ntb_queue_entry *entry; 1562250079Scarl 1563250079Scarl mtx_lock_spin(lock); 1564250079Scarl if (STAILQ_EMPTY(list)) { 1565250079Scarl entry = NULL; 1566250079Scarl goto out; 1567250079Scarl } 1568250079Scarl entry = STAILQ_FIRST(list); 1569250079Scarl STAILQ_REMOVE_HEAD(list, entry); 1570250079Scarlout: 1571250079Scarl mtx_unlock_spin(lock); 1572250079Scarl 1573250079Scarl return (entry); 1574250079Scarl} 1575250079Scarl 1576250079Scarl/* Helper functions */ 1577250079Scarl/* TODO: This too should really be part of the kernel */ 1578250079Scarl#define EUI48_MULTICAST 1 << 0 1579250079Scarl#define EUI48_LOCALLY_ADMINISTERED 1 << 1 1580250079Scarlstatic void 1581250079Scarlcreate_random_local_eui48(u_char *eaddr) 1582250079Scarl{ 1583250079Scarl static uint8_t counter = 0; 1584250079Scarl uint32_t seed = ticks; 1585250079Scarl 1586250079Scarl eaddr[0] = EUI48_LOCALLY_ADMINISTERED; 1587250079Scarl memcpy(&eaddr[1], &seed, sizeof(uint32_t)); 1588250079Scarl eaddr[5] = counter++; 1589250079Scarl} 1590250079Scarl 1591250079Scarl/** 1592250079Scarl * ntb_transport_max_size - Query the max payload size of a qp 1593250079Scarl * @qp: NTB transport layer queue to be queried 1594250079Scarl * 1595250079Scarl * Query the maximum payload size permissible on the given qp 1596250079Scarl * 1597250079Scarl * RETURNS: the max payload size of a qp 1598250079Scarl */ 1599250079Scarlstatic unsigned int 1600250079Scarlntb_transport_max_size(struct ntb_transport_qp *qp) 1601250079Scarl{ 1602250079Scarl 1603250079Scarl if (qp == NULL) 1604250079Scarl return (0); 1605250079Scarl 1606250079Scarl return (qp->tx_max_frame - sizeof(struct ntb_payload_header)); 1607250079Scarl} 1608