ntb_transport.c revision 289154
1250079Scarl/*- 2250079Scarl * Copyright (C) 2013 Intel Corporation 3250079Scarl * All rights reserved. 4250079Scarl * 5250079Scarl * Redistribution and use in source and binary forms, with or without 6250079Scarl * modification, are permitted provided that the following conditions 7250079Scarl * are met: 8250079Scarl * 1. Redistributions of source code must retain the above copyright 9250079Scarl * notice, this list of conditions and the following disclaimer. 10250079Scarl * 2. Redistributions in binary form must reproduce the above copyright 11250079Scarl * notice, this list of conditions and the following disclaimer in the 12250079Scarl * documentation and/or other materials provided with the distribution. 13250079Scarl * 14250079Scarl * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15250079Scarl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16250079Scarl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17250079Scarl * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18250079Scarl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19250079Scarl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20250079Scarl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21250079Scarl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22250079Scarl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23250079Scarl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24250079Scarl * SUCH DAMAGE. 25250079Scarl */ 26250079Scarl 27250079Scarl#include <sys/cdefs.h> 28250079Scarl__FBSDID("$FreeBSD: head/sys/dev/ntb/if_ntb/if_ntb.c 289154 2015-10-11 20:59:02Z cem $"); 29250079Scarl 30250079Scarl#include <sys/param.h> 31250079Scarl#include <sys/kernel.h> 32250079Scarl#include <sys/systm.h> 33250079Scarl#include <sys/bus.h> 34250079Scarl#include <sys/ktr.h> 35250079Scarl#include <sys/lock.h> 36250079Scarl#include <sys/malloc.h> 37250079Scarl#include <sys/module.h> 38250079Scarl#include <sys/mutex.h> 39250079Scarl#include <sys/queue.h> 40250079Scarl#include <sys/socket.h> 41250079Scarl#include <sys/sockio.h> 42250079Scarl#include <sys/taskqueue.h> 43250079Scarl#include <net/if.h> 44250079Scarl#include <net/if_media.h> 45250079Scarl#include <net/if_types.h> 46250079Scarl#include <net/if_var.h> 47250079Scarl#include <net/bpf.h> 48250079Scarl#include <net/ethernet.h> 49250079Scarl#include <vm/vm.h> 50250079Scarl#include <vm/pmap.h> 51250079Scarl#include <machine/bus.h> 52250079Scarl#include <machine/cpufunc.h> 53250079Scarl#include <machine/pmap.h> 54250079Scarl 55250079Scarl#include "../ntb_hw/ntb_hw.h" 56250079Scarl 57250079Scarl/* 58250079Scarl * The Non-Transparent Bridge (NTB) is a device on some Intel processors that 59250079Scarl * allows you to connect two systems using a PCI-e link. 60250079Scarl * 61250079Scarl * This module contains a protocol for sending and receiving messages, and 62250079Scarl * exposes that protocol through a simulated ethernet device called ntb. 63250079Scarl * 64250079Scarl * NOTE: Much of the code in this module is shared with Linux. Any patches may 65250079Scarl * be picked up and redistributed in Linux with a dual GPL/BSD license. 66250079Scarl */ 67250079Scarl 68250079Scarl/* TODO: These functions should really be part of the kernel */ 69250079Scarl#define test_bit(pos, bitmap_addr) (*(bitmap_addr) & 1UL << (pos)) 70250079Scarl#define set_bit(pos, bitmap_addr) *(bitmap_addr) |= 1UL << (pos) 71250079Scarl#define clear_bit(pos, bitmap_addr) *(bitmap_addr) &= ~(1UL << (pos)) 72250079Scarl 73250079Scarl#define KTR_NTB KTR_SPARE3 74250079Scarl 75250079Scarl#define NTB_TRANSPORT_VERSION 3 76250079Scarl#define NTB_RX_MAX_PKTS 64 77250079Scarl#define NTB_RXQ_SIZE 300 78250079Scarl 79250079Scarlstatic unsigned int transport_mtu = 0x4000 + ETHER_HDR_LEN + ETHER_CRC_LEN; 80250079Scarlstatic unsigned int max_num_clients = 1; 81250079Scarl 82250079ScarlSTAILQ_HEAD(ntb_queue_list, ntb_queue_entry); 83250079Scarl 84250079Scarlstruct ntb_queue_entry { 85250079Scarl /* ntb_queue list reference */ 86250079Scarl STAILQ_ENTRY(ntb_queue_entry) entry; 87250079Scarl 88250079Scarl /* info on data to be transfered */ 89250079Scarl void *cb_data; 90250079Scarl void *buf; 91250079Scarl uint64_t len; 92250079Scarl uint64_t flags; 93250079Scarl}; 94250079Scarl 95250079Scarlstruct ntb_rx_info { 96250079Scarl unsigned int entry; 97250079Scarl}; 98250079Scarl 99250079Scarlstruct ntb_transport_qp { 100250079Scarl struct ntb_netdev *transport; 101250079Scarl struct ntb_softc *ntb; 102250079Scarl 103250079Scarl void *cb_data; 104250079Scarl 105250079Scarl bool client_ready; 106250079Scarl bool qp_link; 107255281Scarl uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */ 108250079Scarl 109250079Scarl struct ntb_rx_info *rx_info; 110250079Scarl struct ntb_rx_info *remote_rx_info; 111250079Scarl 112250079Scarl void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, 113250079Scarl void *data, int len); 114250079Scarl struct ntb_queue_list tx_free_q; 115250079Scarl struct mtx ntb_tx_free_q_lock; 116250079Scarl void *tx_mw; 117250079Scarl uint64_t tx_index; 118250079Scarl uint64_t tx_max_entry; 119250079Scarl uint64_t tx_max_frame; 120250079Scarl 121250079Scarl void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, 122250079Scarl void *data, int len); 123250079Scarl struct ntb_queue_list rx_pend_q; 124250079Scarl struct ntb_queue_list rx_free_q; 125250079Scarl struct mtx ntb_rx_pend_q_lock; 126250079Scarl struct mtx ntb_rx_free_q_lock; 127250079Scarl struct task rx_completion_task; 128250079Scarl void *rx_buff; 129250079Scarl uint64_t rx_index; 130250079Scarl uint64_t rx_max_entry; 131250079Scarl uint64_t rx_max_frame; 132250079Scarl 133250079Scarl void (*event_handler) (void *data, int status); 134250079Scarl struct callout link_work; 135250079Scarl struct callout queue_full; 136250079Scarl struct callout rx_full; 137250079Scarl 138250079Scarl uint64_t last_rx_no_buf; 139250079Scarl 140250079Scarl /* Stats */ 141250079Scarl uint64_t rx_bytes; 142250079Scarl uint64_t rx_pkts; 143250079Scarl uint64_t rx_ring_empty; 144250079Scarl uint64_t rx_err_no_buf; 145250079Scarl uint64_t rx_err_oflow; 146250079Scarl uint64_t rx_err_ver; 147250079Scarl uint64_t tx_bytes; 148250079Scarl uint64_t tx_pkts; 149250079Scarl uint64_t tx_ring_full; 150250079Scarl}; 151250079Scarl 152250079Scarlstruct ntb_queue_handlers { 153250079Scarl void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, 154250079Scarl void *data, int len); 155250079Scarl void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, 156250079Scarl void *data, int len); 157250079Scarl void (*event_handler) (void *data, int status); 158250079Scarl}; 159250079Scarl 160250079Scarl 161250079Scarlstruct ntb_transport_mw { 162250079Scarl size_t size; 163250079Scarl void *virt_addr; 164250079Scarl vm_paddr_t dma_addr; 165250079Scarl}; 166250079Scarl 167250079Scarlstruct ntb_netdev { 168250079Scarl struct ntb_softc *ntb; 169250079Scarl struct ifnet *ifp; 170250079Scarl struct ntb_transport_mw mw[NTB_NUM_MW]; 171250079Scarl struct ntb_transport_qp *qps; 172250079Scarl uint64_t max_qps; 173250079Scarl uint64_t qp_bitmap; 174250079Scarl bool transport_link; 175250079Scarl struct callout link_work; 176250079Scarl struct ntb_transport_qp *qp; 177250079Scarl uint64_t bufsize; 178250079Scarl u_char eaddr[ETHER_ADDR_LEN]; 179250079Scarl struct mtx tx_lock; 180250079Scarl struct mtx rx_lock; 181250079Scarl}; 182250079Scarl 183250079Scarlstatic struct ntb_netdev net_softc; 184250079Scarl 185250079Scarlenum { 186250079Scarl IF_NTB_DESC_DONE_FLAG = 1 << 0, 187250079Scarl IF_NTB_LINK_DOWN_FLAG = 1 << 1, 188250079Scarl}; 189250079Scarl 190250079Scarlstruct ntb_payload_header { 191250079Scarl uint64_t ver; 192250079Scarl uint64_t len; 193250079Scarl uint64_t flags; 194250079Scarl}; 195250079Scarl 196250079Scarlenum { 197289153Scem /* 198289153Scem * The order of this enum is part of the if_ntb remote protocol. Do 199289153Scem * not reorder without bumping protocol version (and it's probably best 200289153Scem * to keep the protocol in lock-step with the Linux NTB driver. 201289153Scem */ 202250079Scarl IF_NTB_VERSION = 0, 203289153Scem IF_NTB_QP_LINKS, 204250079Scarl IF_NTB_NUM_QPS, 205289153Scem IF_NTB_NUM_MWS, 206289153Scem /* 207289153Scem * N.B.: transport_link_work assumes MW1 enums = MW0 + 2. 208289153Scem */ 209289153Scem IF_NTB_MW0_SZ_HIGH, 210289153Scem IF_NTB_MW0_SZ_LOW, 211289153Scem IF_NTB_MW1_SZ_HIGH, 212289153Scem IF_NTB_MW1_SZ_LOW, 213250079Scarl IF_NTB_MAX_SPAD, 214250079Scarl}; 215250079Scarl 216250079Scarl#define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) 217250079Scarl#define NTB_QP_DEF_NUM_ENTRIES 100 218250079Scarl#define NTB_LINK_DOWN_TIMEOUT 10 219250079Scarl 220250079Scarlstatic int ntb_handle_module_events(struct module *m, int what, void *arg); 221250079Scarlstatic int ntb_setup_interface(void); 222250079Scarlstatic int ntb_teardown_interface(void); 223250079Scarlstatic void ntb_net_init(void *arg); 224250079Scarlstatic int ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data); 225250079Scarlstatic void ntb_start(struct ifnet *ifp); 226250079Scarlstatic void ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, 227250079Scarl void *data, int len); 228250079Scarlstatic void ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, 229250079Scarl void *data, int len); 230250079Scarlstatic void ntb_net_event_handler(void *data, int status); 231250079Scarlstatic int ntb_transport_init(struct ntb_softc *ntb); 232250079Scarlstatic void ntb_transport_free(void *transport); 233250079Scarlstatic void ntb_transport_init_queue(struct ntb_netdev *nt, 234250079Scarl unsigned int qp_num); 235250079Scarlstatic void ntb_transport_free_queue(struct ntb_transport_qp *qp); 236250079Scarlstatic struct ntb_transport_qp * ntb_transport_create_queue(void *data, 237250079Scarl struct ntb_softc *pdev, const struct ntb_queue_handlers *handlers); 238250079Scarlstatic void ntb_transport_link_up(struct ntb_transport_qp *qp); 239250079Scarlstatic int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, 240250079Scarl void *data, unsigned int len); 241250079Scarlstatic int ntb_process_tx(struct ntb_transport_qp *qp, 242250079Scarl struct ntb_queue_entry *entry); 243250079Scarlstatic void ntb_tx_copy_task(struct ntb_transport_qp *qp, 244250079Scarl struct ntb_queue_entry *entry, void *offset); 245250079Scarlstatic void ntb_qp_full(void *arg); 246250079Scarlstatic void ntb_transport_rxc_db(void *data, int db_num); 247250079Scarlstatic void ntb_rx_pendq_full(void *arg); 248250079Scarlstatic void ntb_transport_rx(struct ntb_transport_qp *qp); 249250079Scarlstatic int ntb_process_rxc(struct ntb_transport_qp *qp); 250250079Scarlstatic void ntb_rx_copy_task(struct ntb_transport_qp *qp, 251250079Scarl struct ntb_queue_entry *entry, void *offset); 252250079Scarlstatic void ntb_rx_completion_task(void *arg, int pending); 253250079Scarlstatic void ntb_transport_event_callback(void *data, enum ntb_hw_event event); 254250079Scarlstatic void ntb_transport_link_work(void *arg); 255250079Scarlstatic int ntb_set_mw(struct ntb_netdev *nt, int num_mw, unsigned int size); 256289153Scemstatic void ntb_free_mw(struct ntb_netdev *nt, int num_mw); 257250079Scarlstatic void ntb_transport_setup_qp_mw(struct ntb_netdev *nt, 258250079Scarl unsigned int qp_num); 259250079Scarlstatic void ntb_qp_link_work(void *arg); 260250079Scarlstatic void ntb_transport_link_cleanup(struct ntb_netdev *nt); 261250079Scarlstatic void ntb_qp_link_down(struct ntb_transport_qp *qp); 262250079Scarlstatic void ntb_qp_link_cleanup(struct ntb_transport_qp *qp); 263250079Scarlstatic void ntb_transport_link_down(struct ntb_transport_qp *qp); 264250079Scarlstatic void ntb_send_link_down(struct ntb_transport_qp *qp); 265250079Scarlstatic void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 266250079Scarl struct ntb_queue_list *list); 267250079Scarlstatic struct ntb_queue_entry *ntb_list_rm(struct mtx *lock, 268250079Scarl struct ntb_queue_list *list); 269250079Scarlstatic void create_random_local_eui48(u_char *eaddr); 270250079Scarlstatic unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp); 271250079Scarl 272250079ScarlMALLOC_DEFINE(M_NTB_IF, "if_ntb", "ntb network driver"); 273250079Scarl 274250079Scarl/* Module setup and teardown */ 275250079Scarlstatic int 276250079Scarlntb_handle_module_events(struct module *m, int what, void *arg) 277250079Scarl{ 278250079Scarl int err = 0; 279250079Scarl 280250079Scarl switch (what) { 281250079Scarl case MOD_LOAD: 282250079Scarl err = ntb_setup_interface(); 283250079Scarl break; 284250079Scarl case MOD_UNLOAD: 285250079Scarl err = ntb_teardown_interface(); 286250079Scarl break; 287250079Scarl default: 288250079Scarl err = EOPNOTSUPP; 289250079Scarl break; 290250079Scarl } 291250079Scarl return (err); 292250079Scarl} 293250079Scarl 294255271Scarlstatic moduledata_t if_ntb_mod = { 295255271Scarl "if_ntb", 296250079Scarl ntb_handle_module_events, 297250079Scarl NULL 298250079Scarl}; 299250079Scarl 300255271ScarlDECLARE_MODULE(if_ntb, if_ntb_mod, SI_SUB_KLD, SI_ORDER_ANY); 301255271ScarlMODULE_DEPEND(if_ntb, ntb_hw, 1, 1, 1); 302250079Scarl 303250079Scarlstatic int 304250079Scarlntb_setup_interface() 305250079Scarl{ 306250079Scarl struct ifnet *ifp; 307250079Scarl struct ntb_queue_handlers handlers = { ntb_net_rx_handler, 308250079Scarl ntb_net_tx_handler, ntb_net_event_handler }; 309250079Scarl 310250079Scarl net_softc.ntb = devclass_get_softc(devclass_find("ntb_hw"), 0); 311250079Scarl if (net_softc.ntb == NULL) { 312255281Scarl printf("ntb: Cannot find devclass\n"); 313250079Scarl return (ENXIO); 314250079Scarl } 315250079Scarl 316250079Scarl ntb_transport_init(net_softc.ntb); 317250079Scarl 318250079Scarl ifp = net_softc.ifp = if_alloc(IFT_ETHER); 319250079Scarl if (ifp == NULL) { 320250079Scarl printf("ntb: cannot allocate ifnet structure\n"); 321250079Scarl return (ENOMEM); 322250079Scarl } 323250079Scarl 324250079Scarl net_softc.qp = ntb_transport_create_queue(ifp, net_softc.ntb, 325250079Scarl &handlers); 326250079Scarl if_initname(ifp, "ntb", 0); 327250079Scarl ifp->if_init = ntb_net_init; 328250079Scarl ifp->if_softc = &net_softc; 329250079Scarl ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 330250079Scarl ifp->if_ioctl = ntb_ioctl; 331250079Scarl ifp->if_start = ntb_start; 332250079Scarl IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 333250079Scarl ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 334250079Scarl IFQ_SET_READY(&ifp->if_snd); 335250079Scarl create_random_local_eui48(net_softc.eaddr); 336250079Scarl ether_ifattach(ifp, net_softc.eaddr); 337250079Scarl ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_JUMBO_MTU; 338250079Scarl ifp->if_capenable = ifp->if_capabilities; 339250079Scarl 340250079Scarl ntb_transport_link_up(net_softc.qp); 341250079Scarl net_softc.bufsize = ntb_transport_max_size(net_softc.qp) + 342250079Scarl sizeof(struct ether_header); 343250079Scarl return (0); 344250079Scarl} 345250079Scarl 346250079Scarlstatic int 347250079Scarlntb_teardown_interface() 348250079Scarl{ 349250079Scarl 350255280Scarl if (net_softc.qp != NULL) 351255280Scarl ntb_transport_link_down(net_softc.qp); 352250079Scarl 353255280Scarl if (net_softc.ifp != NULL) { 354255280Scarl ether_ifdetach(net_softc.ifp); 355255280Scarl if_free(net_softc.ifp); 356255280Scarl } 357250079Scarl 358255280Scarl if (net_softc.qp != NULL) { 359255280Scarl ntb_transport_free_queue(net_softc.qp); 360255280Scarl ntb_transport_free(&net_softc); 361255280Scarl } 362255280Scarl 363250079Scarl return (0); 364250079Scarl} 365250079Scarl 366250079Scarl/* Network device interface */ 367250079Scarl 368250079Scarlstatic void 369250079Scarlntb_net_init(void *arg) 370250079Scarl{ 371250079Scarl struct ntb_netdev *ntb_softc = arg; 372250079Scarl struct ifnet *ifp = ntb_softc->ifp; 373250079Scarl 374250079Scarl ifp->if_drv_flags |= IFF_DRV_RUNNING; 375250079Scarl ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 376250079Scarl ifp->if_flags |= IFF_UP; 377250079Scarl if_link_state_change(ifp, LINK_STATE_UP); 378250079Scarl} 379250079Scarl 380250079Scarlstatic int 381250079Scarlntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 382250079Scarl{ 383250079Scarl struct ntb_netdev *nt = ifp->if_softc; 384250079Scarl struct ifreq *ifr = (struct ifreq *)data; 385250079Scarl int error = 0; 386250079Scarl 387250079Scarl switch (command) { 388250079Scarl case SIOCSIFMTU: 389250079Scarl { 390250079Scarl if (ifr->ifr_mtu > ntb_transport_max_size(nt->qp) - 391250079Scarl ETHER_HDR_LEN - ETHER_CRC_LEN) { 392250079Scarl error = EINVAL; 393250079Scarl break; 394250079Scarl } 395250079Scarl 396250079Scarl ifp->if_mtu = ifr->ifr_mtu; 397250079Scarl break; 398250079Scarl } 399250079Scarl default: 400250079Scarl error = ether_ioctl(ifp, command, data); 401250079Scarl break; 402250079Scarl } 403250079Scarl 404250079Scarl return (error); 405250079Scarl} 406250079Scarl 407250079Scarl 408250079Scarlstatic void 409250079Scarlntb_start(struct ifnet *ifp) 410250079Scarl{ 411250079Scarl struct mbuf *m_head; 412250079Scarl struct ntb_netdev *nt = ifp->if_softc; 413250079Scarl int rc; 414250079Scarl 415250079Scarl mtx_lock(&nt->tx_lock); 416250079Scarl ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 417250079Scarl CTR0(KTR_NTB, "TX: ntb_start"); 418250079Scarl while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 419250079Scarl IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head); 420250079Scarl CTR1(KTR_NTB, "TX: start mbuf %p", m_head); 421250079Scarl rc = ntb_transport_tx_enqueue(nt->qp, m_head, m_head, 422250079Scarl m_length(m_head, NULL)); 423250079Scarl if (rc != 0) { 424250079Scarl CTR1(KTR_NTB, 425255281Scarl "TX: could not tx mbuf %p. Returning to snd q", 426250079Scarl m_head); 427250079Scarl if (rc == EAGAIN) { 428250079Scarl ifp->if_drv_flags |= IFF_DRV_OACTIVE; 429250079Scarl IFQ_DRV_PREPEND(&ifp->if_snd, m_head); 430250079Scarl callout_reset(&nt->qp->queue_full, hz / 1000, 431250079Scarl ntb_qp_full, ifp); 432250079Scarl } 433250079Scarl break; 434250079Scarl } 435250079Scarl 436250079Scarl } 437250079Scarl mtx_unlock(&nt->tx_lock); 438250079Scarl} 439250079Scarl 440250079Scarl/* Network Device Callbacks */ 441250079Scarlstatic void 442250079Scarlntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 443250079Scarl int len) 444250079Scarl{ 445250079Scarl 446250079Scarl m_freem(data); 447250079Scarl CTR1(KTR_NTB, "TX: tx_handler freeing mbuf %p", data); 448250079Scarl} 449250079Scarl 450250079Scarlstatic void 451250079Scarlntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 452250079Scarl int len) 453250079Scarl{ 454250079Scarl struct mbuf *m = data; 455250079Scarl struct ifnet *ifp = qp_data; 456250079Scarl 457250079Scarl CTR0(KTR_NTB, "RX: rx handler"); 458250079Scarl (*ifp->if_input)(ifp, m); 459250079Scarl} 460250079Scarl 461250079Scarlstatic void 462250079Scarlntb_net_event_handler(void *data, int status) 463250079Scarl{ 464250079Scarl 465250079Scarl} 466250079Scarl 467250079Scarl/* Transport Init and teardown */ 468250079Scarl 469250079Scarlstatic int 470250079Scarlntb_transport_init(struct ntb_softc *ntb) 471250079Scarl{ 472250079Scarl struct ntb_netdev *nt = &net_softc; 473250079Scarl int rc, i; 474250079Scarl 475250079Scarl nt->max_qps = max_num_clients; 476250079Scarl ntb_register_transport(ntb, nt); 477250079Scarl mtx_init(&nt->tx_lock, "ntb transport tx", NULL, MTX_DEF); 478250079Scarl mtx_init(&nt->rx_lock, "ntb transport rx", NULL, MTX_DEF); 479250079Scarl 480250079Scarl nt->qps = malloc(nt->max_qps * sizeof(struct ntb_transport_qp), 481250079Scarl M_NTB_IF, M_WAITOK|M_ZERO); 482250079Scarl 483250079Scarl nt->qp_bitmap = ((uint64_t) 1 << nt->max_qps) - 1; 484250079Scarl 485250079Scarl for (i = 0; i < nt->max_qps; i++) 486250079Scarl ntb_transport_init_queue(nt, i); 487250079Scarl 488250079Scarl callout_init(&nt->link_work, 0); 489250079Scarl 490250079Scarl rc = ntb_register_event_callback(ntb, 491250079Scarl ntb_transport_event_callback); 492250079Scarl if (rc != 0) 493250079Scarl goto err; 494250079Scarl 495255268Scarl if (ntb_query_link_status(ntb)) { 496255268Scarl if (bootverbose) 497255268Scarl device_printf(ntb_get_device(ntb), "link up\n"); 498250079Scarl callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 499255268Scarl } 500250079Scarl 501250079Scarl return (0); 502250079Scarl 503250079Scarlerr: 504250079Scarl free(nt->qps, M_NTB_IF); 505250079Scarl ntb_unregister_transport(ntb); 506250079Scarl return (rc); 507250079Scarl} 508250079Scarl 509250079Scarlstatic void 510250079Scarlntb_transport_free(void *transport) 511250079Scarl{ 512250079Scarl struct ntb_netdev *nt = transport; 513250079Scarl struct ntb_softc *ntb = nt->ntb; 514250079Scarl int i; 515250079Scarl 516250079Scarl nt->transport_link = NTB_LINK_DOWN; 517250079Scarl 518250079Scarl callout_drain(&nt->link_work); 519250079Scarl 520255281Scarl /* verify that all the qps are freed */ 521250079Scarl for (i = 0; i < nt->max_qps; i++) 522250079Scarl if (!test_bit(i, &nt->qp_bitmap)) 523250079Scarl ntb_transport_free_queue(&nt->qps[i]); 524250079Scarl 525250079Scarl 526250079Scarl ntb_unregister_event_callback(ntb); 527250079Scarl 528250079Scarl for (i = 0; i < NTB_NUM_MW; i++) 529289153Scem ntb_free_mw(nt, i); 530250079Scarl 531250079Scarl free(nt->qps, M_NTB_IF); 532250079Scarl ntb_unregister_transport(ntb); 533250079Scarl} 534250079Scarl 535250079Scarlstatic void 536250079Scarlntb_transport_init_queue(struct ntb_netdev *nt, unsigned int qp_num) 537250079Scarl{ 538250079Scarl struct ntb_transport_qp *qp; 539250079Scarl unsigned int num_qps_mw, tx_size; 540250079Scarl uint8_t mw_num = QP_TO_MW(qp_num); 541250079Scarl 542250079Scarl qp = &nt->qps[qp_num]; 543250079Scarl qp->qp_num = qp_num; 544250079Scarl qp->transport = nt; 545250079Scarl qp->ntb = nt->ntb; 546250079Scarl qp->qp_link = NTB_LINK_DOWN; 547250079Scarl qp->client_ready = NTB_LINK_DOWN; 548250079Scarl qp->event_handler = NULL; 549250079Scarl 550250079Scarl if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) 551250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; 552250079Scarl else 553250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW; 554250079Scarl 555250079Scarl tx_size = (unsigned int) ntb_get_mw_size(qp->ntb, mw_num) / num_qps_mw; 556250079Scarl qp->rx_info = (struct ntb_rx_info *) 557250079Scarl ((char *)ntb_get_mw_vbase(qp->ntb, mw_num) + 558250079Scarl (qp_num / NTB_NUM_MW * tx_size)); 559250079Scarl tx_size -= sizeof(struct ntb_rx_info); 560250079Scarl 561289152Scem qp->tx_mw = qp->rx_info + 1; 562250079Scarl qp->tx_max_frame = min(transport_mtu + sizeof(struct ntb_payload_header), 563250079Scarl tx_size); 564250079Scarl qp->tx_max_entry = tx_size / qp->tx_max_frame; 565250079Scarl qp->tx_index = 0; 566250079Scarl 567250079Scarl callout_init(&qp->link_work, 0); 568283291Sjkim callout_init(&qp->queue_full, 1); 569283291Sjkim callout_init(&qp->rx_full, 1); 570250079Scarl 571250079Scarl mtx_init(&qp->ntb_rx_pend_q_lock, "ntb rx pend q", NULL, MTX_SPIN); 572250079Scarl mtx_init(&qp->ntb_rx_free_q_lock, "ntb rx free q", NULL, MTX_SPIN); 573250079Scarl mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN); 574250079Scarl TASK_INIT(&qp->rx_completion_task, 0, ntb_rx_completion_task, qp); 575250079Scarl 576250079Scarl STAILQ_INIT(&qp->rx_pend_q); 577250079Scarl STAILQ_INIT(&qp->rx_free_q); 578250079Scarl STAILQ_INIT(&qp->tx_free_q); 579250079Scarl} 580250079Scarl 581250079Scarlstatic void 582250079Scarlntb_transport_free_queue(struct ntb_transport_qp *qp) 583250079Scarl{ 584250079Scarl struct ntb_queue_entry *entry; 585250079Scarl 586250079Scarl if (qp == NULL) 587250079Scarl return; 588250079Scarl 589250079Scarl callout_drain(&qp->link_work); 590250079Scarl 591250079Scarl ntb_unregister_db_callback(qp->ntb, qp->qp_num); 592250079Scarl 593250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 594250079Scarl free(entry, M_NTB_IF); 595250079Scarl 596250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) 597250079Scarl free(entry, M_NTB_IF); 598250079Scarl 599250079Scarl while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 600250079Scarl free(entry, M_NTB_IF); 601250079Scarl 602250079Scarl set_bit(qp->qp_num, &qp->transport->qp_bitmap); 603250079Scarl} 604250079Scarl 605250079Scarl/** 606250079Scarl * ntb_transport_create_queue - Create a new NTB transport layer queue 607250079Scarl * @rx_handler: receive callback function 608250079Scarl * @tx_handler: transmit callback function 609250079Scarl * @event_handler: event callback function 610250079Scarl * 611250079Scarl * Create a new NTB transport layer queue and provide the queue with a callback 612250079Scarl * routine for both transmit and receive. The receive callback routine will be 613250079Scarl * used to pass up data when the transport has received it on the queue. The 614250079Scarl * transmit callback routine will be called when the transport has completed the 615250079Scarl * transmission of the data on the queue and the data is ready to be freed. 616250079Scarl * 617250079Scarl * RETURNS: pointer to newly created ntb_queue, NULL on error. 618250079Scarl */ 619250079Scarlstatic struct ntb_transport_qp * 620250079Scarlntb_transport_create_queue(void *data, struct ntb_softc *pdev, 621250079Scarl const struct ntb_queue_handlers *handlers) 622250079Scarl{ 623250079Scarl struct ntb_queue_entry *entry; 624250079Scarl struct ntb_transport_qp *qp; 625250079Scarl struct ntb_netdev *nt; 626250079Scarl unsigned int free_queue; 627250079Scarl int rc, i; 628250079Scarl 629250079Scarl nt = ntb_find_transport(pdev); 630250079Scarl if (nt == NULL) 631250079Scarl goto err; 632250079Scarl 633250079Scarl free_queue = ffs(nt->qp_bitmap); 634250079Scarl if (free_queue == 0) 635250079Scarl goto err; 636250079Scarl 637250079Scarl /* decrement free_queue to make it zero based */ 638250079Scarl free_queue--; 639250079Scarl 640250079Scarl clear_bit(free_queue, &nt->qp_bitmap); 641250079Scarl 642250079Scarl qp = &nt->qps[free_queue]; 643250079Scarl qp->cb_data = data; 644250079Scarl qp->rx_handler = handlers->rx_handler; 645250079Scarl qp->tx_handler = handlers->tx_handler; 646250079Scarl qp->event_handler = handlers->event_handler; 647250079Scarl 648250079Scarl for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 649250079Scarl entry = malloc(sizeof(struct ntb_queue_entry), M_NTB_IF, 650250079Scarl M_WAITOK|M_ZERO); 651250079Scarl entry->cb_data = nt->ifp; 652250079Scarl entry->buf = NULL; 653250079Scarl entry->len = transport_mtu; 654250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 655250079Scarl } 656250079Scarl 657250079Scarl for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 658250079Scarl entry = malloc(sizeof(struct ntb_queue_entry), M_NTB_IF, 659250079Scarl M_WAITOK|M_ZERO); 660250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 661250079Scarl } 662250079Scarl 663250079Scarl rc = ntb_register_db_callback(qp->ntb, free_queue, qp, 664250079Scarl ntb_transport_rxc_db); 665250079Scarl if (rc != 0) 666250079Scarl goto err1; 667250079Scarl 668250079Scarl return (qp); 669250079Scarl 670250079Scarlerr1: 671250079Scarl while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 672250079Scarl free(entry, M_NTB_IF); 673250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 674250079Scarl free(entry, M_NTB_IF); 675250079Scarl set_bit(free_queue, &nt->qp_bitmap); 676250079Scarlerr: 677250079Scarl return (NULL); 678250079Scarl} 679250079Scarl 680250079Scarl/** 681250079Scarl * ntb_transport_link_up - Notify NTB transport of client readiness to use queue 682250079Scarl * @qp: NTB transport layer queue to be enabled 683250079Scarl * 684250079Scarl * Notify NTB transport layer of client readiness to use queue 685250079Scarl */ 686250079Scarlstatic void 687250079Scarlntb_transport_link_up(struct ntb_transport_qp *qp) 688250079Scarl{ 689250079Scarl 690250079Scarl if (qp == NULL) 691250079Scarl return; 692250079Scarl 693250079Scarl qp->client_ready = NTB_LINK_UP; 694255268Scarl if (bootverbose) 695255268Scarl device_printf(ntb_get_device(qp->ntb), "qp client ready\n"); 696250079Scarl 697250079Scarl if (qp->transport->transport_link == NTB_LINK_UP) 698250079Scarl callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 699250079Scarl} 700250079Scarl 701250079Scarl 702250079Scarl 703250079Scarl/* Transport Tx */ 704250079Scarl 705250079Scarl/** 706250079Scarl * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry 707250079Scarl * @qp: NTB transport layer queue the entry is to be enqueued on 708250079Scarl * @cb: per buffer pointer for callback function to use 709250079Scarl * @data: pointer to data buffer that will be sent 710250079Scarl * @len: length of the data buffer 711250079Scarl * 712250079Scarl * Enqueue a new transmit buffer onto the transport queue from which a NTB 713250079Scarl * payload will be transmitted. This assumes that a lock is behing held to 714250079Scarl * serialize access to the qp. 715250079Scarl * 716250079Scarl * RETURNS: An appropriate ERRNO error value on error, or zero for success. 717250079Scarl */ 718250079Scarlstatic int 719250079Scarlntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, 720250079Scarl unsigned int len) 721250079Scarl{ 722250079Scarl struct ntb_queue_entry *entry; 723250079Scarl int rc; 724250079Scarl 725250079Scarl if (qp == NULL || qp->qp_link != NTB_LINK_UP || len == 0) { 726250079Scarl CTR0(KTR_NTB, "TX: link not up"); 727250079Scarl return (EINVAL); 728250079Scarl } 729250079Scarl 730250079Scarl entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 731250079Scarl if (entry == NULL) { 732255281Scarl CTR0(KTR_NTB, "TX: could not get entry from tx_free_q"); 733250079Scarl return (ENOMEM); 734250079Scarl } 735250079Scarl CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry); 736250079Scarl 737250079Scarl entry->cb_data = cb; 738250079Scarl entry->buf = data; 739250079Scarl entry->len = len; 740250079Scarl entry->flags = 0; 741250079Scarl 742250079Scarl rc = ntb_process_tx(qp, entry); 743250079Scarl if (rc != 0) { 744250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 745250079Scarl CTR1(KTR_NTB, 746250079Scarl "TX: process_tx failed. Returning entry %p to tx_free_q", 747250079Scarl entry); 748250079Scarl } 749250079Scarl return (rc); 750250079Scarl} 751250079Scarl 752250079Scarlstatic int 753250079Scarlntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry) 754250079Scarl{ 755250079Scarl void *offset; 756250079Scarl 757250079Scarl offset = (char *)qp->tx_mw + qp->tx_max_frame * qp->tx_index; 758250079Scarl CTR3(KTR_NTB, 759250079Scarl "TX: process_tx: tx_pkts=%u, tx_index=%u, remote entry=%u", 760250079Scarl qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry); 761250079Scarl if (qp->tx_index == qp->remote_rx_info->entry) { 762250079Scarl CTR0(KTR_NTB, "TX: ring full"); 763250079Scarl qp->tx_ring_full++; 764250079Scarl return (EAGAIN); 765250079Scarl } 766250079Scarl 767250079Scarl if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { 768250079Scarl if (qp->tx_handler != NULL) 769250079Scarl qp->tx_handler(qp, qp->cb_data, entry->buf, 770250079Scarl EIO); 771250079Scarl 772250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 773250079Scarl CTR1(KTR_NTB, 774250079Scarl "TX: frame too big. returning entry %p to tx_free_q", 775250079Scarl entry); 776250079Scarl return (0); 777250079Scarl } 778250079Scarl CTR2(KTR_NTB, "TX: copying entry %p to offset %p", entry, offset); 779250079Scarl ntb_tx_copy_task(qp, entry, offset); 780250079Scarl 781250079Scarl qp->tx_index++; 782250079Scarl qp->tx_index %= qp->tx_max_entry; 783250079Scarl 784250079Scarl qp->tx_pkts++; 785250079Scarl 786250079Scarl return (0); 787250079Scarl} 788250079Scarl 789250079Scarlstatic void 790250079Scarlntb_tx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 791250079Scarl void *offset) 792250079Scarl{ 793250079Scarl struct ntb_payload_header *hdr; 794250079Scarl 795250079Scarl CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset); 796250079Scarl if (entry->buf != NULL) 797250079Scarl m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset); 798250079Scarl 799250079Scarl hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame - 800250079Scarl sizeof(struct ntb_payload_header)); 801250079Scarl hdr->len = entry->len; /* TODO: replace with bus_space_write */ 802250079Scarl hdr->ver = qp->tx_pkts; /* TODO: replace with bus_space_write */ 803250079Scarl wmb(); 804250079Scarl /* TODO: replace with bus_space_write */ 805250079Scarl hdr->flags = entry->flags | IF_NTB_DESC_DONE_FLAG; 806250079Scarl 807250079Scarl ntb_ring_sdb(qp->ntb, qp->qp_num); 808250079Scarl 809250079Scarl /* 810250079Scarl * The entry length can only be zero if the packet is intended to be a 811250079Scarl * "link down" or similar. Since no payload is being sent in these 812250079Scarl * cases, there is nothing to add to the completion queue. 813250079Scarl */ 814250079Scarl if (entry->len > 0) { 815250079Scarl qp->tx_bytes += entry->len; 816250079Scarl 817250079Scarl if (qp->tx_handler) 818250079Scarl qp->tx_handler(qp, qp->cb_data, entry->cb_data, 819250079Scarl entry->len); 820250079Scarl } 821250079Scarl 822250079Scarl CTR2(KTR_NTB, 823250079Scarl "TX: entry %p sent. hdr->ver = %d, Returning to tx_free_q", entry, 824250079Scarl hdr->ver); 825250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 826250079Scarl} 827250079Scarl 828250079Scarlstatic void 829250079Scarlntb_qp_full(void *arg) 830250079Scarl{ 831250079Scarl 832250079Scarl CTR0(KTR_NTB, "TX: qp_full callout"); 833250079Scarl ntb_start(arg); 834250079Scarl} 835250079Scarl 836250079Scarl/* Transport Rx */ 837250079Scarlstatic void 838250079Scarlntb_transport_rxc_db(void *data, int db_num) 839250079Scarl{ 840250079Scarl struct ntb_transport_qp *qp = data; 841250079Scarl 842250079Scarl ntb_transport_rx(qp); 843250079Scarl} 844250079Scarl 845250079Scarlstatic void 846250079Scarlntb_rx_pendq_full(void *arg) 847250079Scarl{ 848250079Scarl 849250079Scarl CTR0(KTR_NTB, "RX: ntb_rx_pendq_full callout"); 850250079Scarl ntb_transport_rx(arg); 851250079Scarl} 852250079Scarl 853250079Scarlstatic void 854250079Scarlntb_transport_rx(struct ntb_transport_qp *qp) 855250079Scarl{ 856250079Scarl int rc, i; 857250079Scarl 858250079Scarl /* 859250079Scarl * Limit the number of packets processed in a single interrupt to 860250079Scarl * provide fairness to others 861250079Scarl */ 862250079Scarl mtx_lock(&qp->transport->rx_lock); 863250079Scarl CTR0(KTR_NTB, "RX: transport_rx"); 864250079Scarl for (i = 0; i < NTB_RX_MAX_PKTS; i++) { 865250079Scarl rc = ntb_process_rxc(qp); 866250079Scarl if (rc != 0) { 867250079Scarl CTR0(KTR_NTB, "RX: process_rxc failed"); 868250079Scarl break; 869250079Scarl } 870250079Scarl } 871250079Scarl mtx_unlock(&qp->transport->rx_lock); 872250079Scarl} 873250079Scarl 874250079Scarlstatic int 875250079Scarlntb_process_rxc(struct ntb_transport_qp *qp) 876250079Scarl{ 877250079Scarl struct ntb_payload_header *hdr; 878250079Scarl struct ntb_queue_entry *entry; 879250079Scarl void *offset; 880250079Scarl 881250079Scarl offset = (void *) 882250079Scarl ((char *)qp->rx_buff + qp->rx_max_frame * qp->rx_index); 883250079Scarl hdr = (void *) 884250079Scarl ((char *)offset + qp->rx_max_frame - 885250079Scarl sizeof(struct ntb_payload_header)); 886250079Scarl 887250079Scarl CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index); 888250079Scarl entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); 889250079Scarl if (entry == NULL) { 890250079Scarl qp->rx_err_no_buf++; 891250079Scarl CTR0(KTR_NTB, "RX: No entries in rx_pend_q"); 892250079Scarl return (ENOMEM); 893250079Scarl } 894250079Scarl callout_stop(&qp->rx_full); 895250079Scarl CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry); 896250079Scarl 897250079Scarl if ((hdr->flags & IF_NTB_DESC_DONE_FLAG) == 0) { 898250079Scarl CTR1(KTR_NTB, 899250079Scarl "RX: hdr not done. Returning entry %p to rx_pend_q", entry); 900250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 901250079Scarl qp->rx_ring_empty++; 902250079Scarl return (EAGAIN); 903250079Scarl } 904250079Scarl 905250079Scarl if (hdr->ver != (uint32_t) qp->rx_pkts) { 906250079Scarl CTR3(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). " 907250079Scarl "Returning entry %p to rx_pend_q", hdr->ver, qp->rx_pkts, 908250079Scarl entry); 909250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 910250079Scarl qp->rx_err_ver++; 911250079Scarl return (EIO); 912250079Scarl } 913250079Scarl 914250079Scarl if ((hdr->flags & IF_NTB_LINK_DOWN_FLAG) != 0) { 915250079Scarl ntb_qp_link_down(qp); 916250079Scarl CTR1(KTR_NTB, 917250079Scarl "RX: link down. adding entry %p back to rx_pend_q", entry); 918250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 919250079Scarl goto out; 920250079Scarl } 921250079Scarl 922250079Scarl if (hdr->len <= entry->len) { 923250079Scarl entry->len = hdr->len; 924250079Scarl ntb_rx_copy_task(qp, entry, offset); 925250079Scarl } else { 926250079Scarl CTR1(KTR_NTB, 927250079Scarl "RX: len too long. Returning entry %p to rx_pend_q", entry); 928250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 929250079Scarl 930250079Scarl qp->rx_err_oflow++; 931250079Scarl } 932250079Scarl 933250079Scarl qp->rx_bytes += hdr->len; 934250079Scarl qp->rx_pkts++; 935250079Scarl CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts); 936250079Scarl 937250079Scarl 938250079Scarlout: 939250079Scarl /* Ensure that the data is globally visible before clearing the flag */ 940250079Scarl wmb(); 941250079Scarl hdr->flags = 0; 942250079Scarl /* TODO: replace with bus_space_write */ 943250079Scarl qp->rx_info->entry = qp->rx_index; 944250079Scarl 945250079Scarl qp->rx_index++; 946250079Scarl qp->rx_index %= qp->rx_max_entry; 947250079Scarl 948250079Scarl return (0); 949250079Scarl} 950250079Scarl 951250079Scarlstatic void 952250079Scarlntb_rx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 953250079Scarl void *offset) 954250079Scarl{ 955250079Scarl struct ifnet *ifp = entry->cb_data; 956250079Scarl unsigned int len = entry->len; 957250079Scarl struct mbuf *m; 958250079Scarl 959250079Scarl CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset); 960250079Scarl m = m_devget(offset, len, 0, ifp, NULL); 961250079Scarl m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID; 962250079Scarl 963250079Scarl entry->buf = (void *)m; 964250079Scarl 965250079Scarl CTR2(KTR_NTB, 966250079Scarl "RX: copied entry %p to mbuf %p. Adding entry to rx_free_q", entry, 967250079Scarl m); 968250079Scarl ntb_list_add(&qp->ntb_rx_free_q_lock, entry, &qp->rx_free_q); 969250079Scarl 970250079Scarl taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 971250079Scarl} 972250079Scarl 973250079Scarlstatic void 974250079Scarlntb_rx_completion_task(void *arg, int pending) 975250079Scarl{ 976250079Scarl struct ntb_transport_qp *qp = arg; 977250079Scarl struct mbuf *m; 978250079Scarl struct ntb_queue_entry *entry; 979250079Scarl 980250079Scarl CTR0(KTR_NTB, "RX: rx_completion_task"); 981250079Scarl 982250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) { 983250079Scarl m = entry->buf; 984250079Scarl CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m); 985250079Scarl if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) 986250079Scarl qp->rx_handler(qp, qp->cb_data, m, entry->len); 987250079Scarl 988250079Scarl entry->buf = NULL; 989250079Scarl entry->len = qp->transport->bufsize; 990250079Scarl 991250079Scarl CTR1(KTR_NTB,"RX: entry %p removed from rx_free_q " 992250079Scarl "and added to rx_pend_q", entry); 993250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 994250079Scarl if (qp->rx_err_no_buf > qp->last_rx_no_buf) { 995250079Scarl qp->last_rx_no_buf = qp->rx_err_no_buf; 996250079Scarl CTR0(KTR_NTB, "RX: could spawn rx task"); 997250079Scarl callout_reset(&qp->rx_full, hz / 1000, ntb_rx_pendq_full, 998250079Scarl qp); 999250079Scarl } 1000250079Scarl } 1001250079Scarl} 1002250079Scarl 1003250079Scarl/* Link Event handler */ 1004250079Scarlstatic void 1005250079Scarlntb_transport_event_callback(void *data, enum ntb_hw_event event) 1006250079Scarl{ 1007250079Scarl struct ntb_netdev *nt = data; 1008250079Scarl 1009250079Scarl switch (event) { 1010250079Scarl case NTB_EVENT_HW_LINK_UP: 1011255268Scarl if (bootverbose) 1012255268Scarl device_printf(ntb_get_device(nt->ntb), "HW link up\n"); 1013250079Scarl callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 1014250079Scarl break; 1015250079Scarl case NTB_EVENT_HW_LINK_DOWN: 1016255268Scarl if (bootverbose) 1017255268Scarl device_printf(ntb_get_device(nt->ntb), "HW link down\n"); 1018250079Scarl ntb_transport_link_cleanup(nt); 1019250079Scarl break; 1020250079Scarl default: 1021250079Scarl panic("ntb: Unknown NTB event"); 1022250079Scarl } 1023250079Scarl} 1024250079Scarl 1025250079Scarl/* Link bring up */ 1026250079Scarlstatic void 1027250079Scarlntb_transport_link_work(void *arg) 1028250079Scarl{ 1029250079Scarl struct ntb_netdev *nt = arg; 1030250079Scarl struct ntb_softc *ntb = nt->ntb; 1031250079Scarl struct ntb_transport_qp *qp; 1032289153Scem uint64_t val64; 1033250079Scarl uint32_t val; 1034250079Scarl int rc, i; 1035250079Scarl 1036289153Scem /* send the local info, in the opposite order of the way we read it */ 1037289153Scem for (i = 0; i < NTB_NUM_MW; i++) { 1038289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1039289153Scem ntb_get_mw_size(ntb, i) >> 32); 1040289153Scem if (rc != 0) 1041289153Scem goto out; 1042250079Scarl 1043289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), 1044289153Scem (uint32_t)ntb_get_mw_size(ntb, i)); 1045289153Scem if (rc != 0) 1046289153Scem goto out; 1047289153Scem } 1048250079Scarl 1049289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_NUM_MWS, NTB_NUM_MW); 1050250079Scarl if (rc != 0) 1051250079Scarl goto out; 1052250079Scarl 1053250079Scarl rc = ntb_write_remote_spad(ntb, IF_NTB_NUM_QPS, nt->max_qps); 1054250079Scarl if (rc != 0) 1055250079Scarl goto out; 1056250079Scarl 1057289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_VERSION, NTB_TRANSPORT_VERSION); 1058250079Scarl if (rc != 0) 1059250079Scarl goto out; 1060250079Scarl 1061250079Scarl /* Query the remote side for its info */ 1062250079Scarl rc = ntb_read_local_spad(ntb, IF_NTB_VERSION, &val); 1063250079Scarl if (rc != 0) 1064250079Scarl goto out; 1065250079Scarl 1066250079Scarl if (val != NTB_TRANSPORT_VERSION) 1067250079Scarl goto out; 1068250079Scarl 1069250079Scarl rc = ntb_read_local_spad(ntb, IF_NTB_NUM_QPS, &val); 1070250079Scarl if (rc != 0) 1071250079Scarl goto out; 1072250079Scarl 1073250079Scarl if (val != nt->max_qps) 1074250079Scarl goto out; 1075250079Scarl 1076289153Scem rc = ntb_read_local_spad(ntb, IF_NTB_NUM_MWS, &val); 1077250079Scarl if (rc != 0) 1078250079Scarl goto out; 1079250079Scarl 1080289153Scem if (val != NTB_NUM_MW) 1081250079Scarl goto out; 1082250079Scarl 1083289153Scem for (i = 0; i < NTB_NUM_MW; i++) { 1084289153Scem rc = ntb_read_local_spad(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1085289153Scem &val); 1086289153Scem if (rc != 0) 1087289153Scem goto free_mws; 1088250079Scarl 1089289153Scem val64 = (uint64_t)val << 32; 1090250079Scarl 1091289153Scem rc = ntb_read_local_spad(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), 1092289153Scem &val); 1093289153Scem if (rc != 0) 1094289153Scem goto free_mws; 1095250079Scarl 1096289153Scem val64 |= val; 1097250079Scarl 1098289153Scem rc = ntb_set_mw(nt, i, val64); 1099289153Scem if (rc != 0) 1100289153Scem goto free_mws; 1101289153Scem } 1102289153Scem 1103250079Scarl nt->transport_link = NTB_LINK_UP; 1104255268Scarl if (bootverbose) 1105255268Scarl device_printf(ntb_get_device(ntb), "transport link up\n"); 1106250079Scarl 1107250079Scarl for (i = 0; i < nt->max_qps; i++) { 1108250079Scarl qp = &nt->qps[i]; 1109250079Scarl 1110250079Scarl ntb_transport_setup_qp_mw(nt, i); 1111250079Scarl 1112250079Scarl if (qp->client_ready == NTB_LINK_UP) 1113250079Scarl callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 1114250079Scarl } 1115250079Scarl 1116250079Scarl return; 1117250079Scarl 1118289153Scemfree_mws: 1119289153Scem for (i = 0; i < NTB_NUM_MW; i++) 1120289153Scem ntb_free_mw(nt, i); 1121250079Scarlout: 1122250079Scarl if (ntb_query_link_status(ntb)) 1123250079Scarl callout_reset(&nt->link_work, 1124289153Scem NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt); 1125250079Scarl} 1126250079Scarl 1127250079Scarlstatic int 1128250079Scarlntb_set_mw(struct ntb_netdev *nt, int num_mw, unsigned int size) 1129250079Scarl{ 1130250079Scarl struct ntb_transport_mw *mw = &nt->mw[num_mw]; 1131250079Scarl 1132289154Scem /* No need to re-setup */ 1133289154Scem if (mw->size == size) 1134289154Scem return (0); 1135289154Scem 1136289154Scem if (mw->size != 0) 1137289154Scem ntb_free_mw(nt, num_mw); 1138289154Scem 1139250079Scarl /* Alloc memory for receiving data. Must be 4k aligned */ 1140250079Scarl mw->size = size; 1141250079Scarl 1142250079Scarl mw->virt_addr = contigmalloc(mw->size, M_NTB_IF, M_ZERO, 0, 1143250079Scarl BUS_SPACE_MAXADDR, mw->size, 0); 1144250079Scarl if (mw->virt_addr == NULL) { 1145289154Scem mw->size = 0; 1146250079Scarl printf("ntb: Unable to allocate MW buffer of size %d\n", 1147250079Scarl (int)mw->size); 1148250079Scarl return (ENOMEM); 1149250079Scarl } 1150250079Scarl /* TODO: replace with bus_space_* functions */ 1151250079Scarl mw->dma_addr = vtophys(mw->virt_addr); 1152250079Scarl 1153250079Scarl /* Notify HW the memory location of the receive buffer */ 1154250079Scarl ntb_set_mw_addr(nt->ntb, num_mw, mw->dma_addr); 1155250079Scarl 1156250079Scarl return (0); 1157250079Scarl} 1158250079Scarl 1159250079Scarlstatic void 1160289153Scemntb_free_mw(struct ntb_netdev *nt, int num_mw) 1161289153Scem{ 1162289153Scem struct ntb_transport_mw *mw = &nt->mw[num_mw]; 1163289153Scem 1164289153Scem if (mw->virt_addr == NULL) 1165289153Scem return; 1166289153Scem 1167289153Scem contigfree(mw->virt_addr, mw->size, M_NTB_IF); 1168289153Scem mw->virt_addr = NULL; 1169289153Scem} 1170289153Scem 1171289153Scemstatic void 1172250079Scarlntb_transport_setup_qp_mw(struct ntb_netdev *nt, unsigned int qp_num) 1173250079Scarl{ 1174250079Scarl struct ntb_transport_qp *qp = &nt->qps[qp_num]; 1175250079Scarl void *offset; 1176250079Scarl unsigned int rx_size, num_qps_mw; 1177250079Scarl uint8_t mw_num = QP_TO_MW(qp_num); 1178250079Scarl unsigned int i; 1179250079Scarl 1180250079Scarl if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) 1181250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; 1182250079Scarl else 1183250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW; 1184250079Scarl 1185250079Scarl rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; 1186250079Scarl qp->remote_rx_info = (void *)((uint8_t *)nt->mw[mw_num].virt_addr + 1187250079Scarl (qp_num / NTB_NUM_MW * rx_size)); 1188250079Scarl rx_size -= sizeof(struct ntb_rx_info); 1189250079Scarl 1190289152Scem qp->rx_buff = qp->remote_rx_info + 1; 1191250079Scarl qp->rx_max_frame = min(transport_mtu + sizeof(struct ntb_payload_header), 1192250079Scarl rx_size); 1193250079Scarl qp->rx_max_entry = rx_size / qp->rx_max_frame; 1194250079Scarl qp->rx_index = 0; 1195250079Scarl qp->tx_index = 0; 1196250079Scarl 1197250079Scarl qp->remote_rx_info->entry = qp->rx_max_entry; 1198250079Scarl 1199250079Scarl /* setup the hdr offsets with 0's */ 1200250079Scarl for (i = 0; i < qp->rx_max_entry; i++) { 1201250079Scarl offset = (void *)((uint8_t *)qp->rx_buff + 1202250079Scarl qp->rx_max_frame * (i + 1) - 1203250079Scarl sizeof(struct ntb_payload_header)); 1204250079Scarl memset(offset, 0, sizeof(struct ntb_payload_header)); 1205250079Scarl } 1206250079Scarl 1207250079Scarl qp->rx_pkts = 0; 1208250079Scarl qp->tx_pkts = 0; 1209250079Scarl} 1210250079Scarl 1211250079Scarlstatic void 1212250079Scarlntb_qp_link_work(void *arg) 1213250079Scarl{ 1214250079Scarl struct ntb_transport_qp *qp = arg; 1215250079Scarl struct ntb_softc *ntb = qp->ntb; 1216250079Scarl struct ntb_netdev *nt = qp->transport; 1217250079Scarl int rc, val; 1218250079Scarl 1219250079Scarl 1220250079Scarl rc = ntb_read_remote_spad(ntb, IF_NTB_QP_LINKS, &val); 1221250079Scarl if (rc != 0) 1222250079Scarl return; 1223250079Scarl 1224250079Scarl rc = ntb_write_remote_spad(ntb, IF_NTB_QP_LINKS, val | 1 << qp->qp_num); 1225250079Scarl 1226250079Scarl /* query remote spad for qp ready bits */ 1227250079Scarl rc = ntb_read_local_spad(ntb, IF_NTB_QP_LINKS, &val); 1228250079Scarl 1229250079Scarl /* See if the remote side is up */ 1230250079Scarl if ((1 << qp->qp_num & val) != 0) { 1231250079Scarl qp->qp_link = NTB_LINK_UP; 1232250079Scarl if (qp->event_handler != NULL) 1233250079Scarl qp->event_handler(qp->cb_data, NTB_LINK_UP); 1234255268Scarl if (bootverbose) 1235255268Scarl device_printf(ntb_get_device(ntb), "qp link up\n"); 1236250079Scarl } else if (nt->transport_link == NTB_LINK_UP) { 1237250079Scarl callout_reset(&qp->link_work, 1238250079Scarl NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1239250079Scarl } 1240250079Scarl} 1241250079Scarl 1242250079Scarl/* Link down event*/ 1243250079Scarlstatic void 1244250079Scarlntb_transport_link_cleanup(struct ntb_netdev *nt) 1245250079Scarl{ 1246250079Scarl int i; 1247250079Scarl 1248250079Scarl if (nt->transport_link == NTB_LINK_DOWN) 1249250079Scarl callout_drain(&nt->link_work); 1250250079Scarl else 1251250079Scarl nt->transport_link = NTB_LINK_DOWN; 1252250079Scarl 1253250079Scarl /* Pass along the info to any clients */ 1254250079Scarl for (i = 0; i < nt->max_qps; i++) 1255250079Scarl if (!test_bit(i, &nt->qp_bitmap)) 1256250079Scarl ntb_qp_link_down(&nt->qps[i]); 1257250079Scarl 1258250079Scarl /* 1259250079Scarl * The scratchpad registers keep the values if the remote side 1260250079Scarl * goes down, blast them now to give them a sane value the next 1261250079Scarl * time they are accessed 1262250079Scarl */ 1263250079Scarl for (i = 0; i < IF_NTB_MAX_SPAD; i++) 1264250079Scarl ntb_write_local_spad(nt->ntb, i, 0); 1265250079Scarl} 1266250079Scarl 1267250079Scarl 1268250079Scarlstatic void 1269250079Scarlntb_qp_link_down(struct ntb_transport_qp *qp) 1270250079Scarl{ 1271250079Scarl 1272250079Scarl ntb_qp_link_cleanup(qp); 1273250079Scarl} 1274250079Scarl 1275250079Scarlstatic void 1276250079Scarlntb_qp_link_cleanup(struct ntb_transport_qp *qp) 1277250079Scarl{ 1278250079Scarl struct ntb_netdev *nt = qp->transport; 1279250079Scarl 1280250079Scarl if (qp->qp_link == NTB_LINK_DOWN) { 1281250079Scarl callout_drain(&qp->link_work); 1282250079Scarl return; 1283250079Scarl } 1284250079Scarl 1285250079Scarl if (qp->event_handler != NULL) 1286250079Scarl qp->event_handler(qp->cb_data, NTB_LINK_DOWN); 1287250079Scarl 1288250079Scarl qp->qp_link = NTB_LINK_DOWN; 1289250079Scarl 1290250079Scarl if (nt->transport_link == NTB_LINK_UP) 1291250079Scarl callout_reset(&qp->link_work, 1292250079Scarl NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1293250079Scarl} 1294250079Scarl 1295250079Scarl/* Link commanded down */ 1296250079Scarl/** 1297250079Scarl * ntb_transport_link_down - Notify NTB transport to no longer enqueue data 1298250079Scarl * @qp: NTB transport layer queue to be disabled 1299250079Scarl * 1300250079Scarl * Notify NTB transport layer of client's desire to no longer receive data on 1301250079Scarl * transport queue specified. It is the client's responsibility to ensure all 1302250079Scarl * entries on queue are purged or otherwise handled appropraitely. 1303250079Scarl */ 1304250079Scarlstatic void 1305250079Scarlntb_transport_link_down(struct ntb_transport_qp *qp) 1306250079Scarl{ 1307250079Scarl int rc, val; 1308250079Scarl 1309250079Scarl if (qp == NULL) 1310250079Scarl return; 1311250079Scarl 1312250079Scarl qp->client_ready = NTB_LINK_DOWN; 1313250079Scarl 1314250079Scarl rc = ntb_read_remote_spad(qp->ntb, IF_NTB_QP_LINKS, &val); 1315250079Scarl if (rc != 0) 1316250079Scarl return; 1317250079Scarl 1318250079Scarl rc = ntb_write_remote_spad(qp->ntb, IF_NTB_QP_LINKS, 1319250079Scarl val & ~(1 << qp->qp_num)); 1320250079Scarl 1321250079Scarl if (qp->qp_link == NTB_LINK_UP) 1322250079Scarl ntb_send_link_down(qp); 1323250079Scarl else 1324250079Scarl callout_drain(&qp->link_work); 1325250079Scarl 1326250079Scarl} 1327250079Scarl 1328250079Scarlstatic void 1329250079Scarlntb_send_link_down(struct ntb_transport_qp *qp) 1330250079Scarl{ 1331250079Scarl struct ntb_queue_entry *entry; 1332250079Scarl int i, rc; 1333250079Scarl 1334250079Scarl if (qp->qp_link == NTB_LINK_DOWN) 1335250079Scarl return; 1336250079Scarl 1337250079Scarl qp->qp_link = NTB_LINK_DOWN; 1338250079Scarl 1339250079Scarl for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { 1340250079Scarl entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 1341250079Scarl if (entry != NULL) 1342250079Scarl break; 1343250079Scarl pause("NTB Wait for link down", hz / 10); 1344250079Scarl } 1345250079Scarl 1346250079Scarl if (entry == NULL) 1347250079Scarl return; 1348250079Scarl 1349250079Scarl entry->cb_data = NULL; 1350250079Scarl entry->buf = NULL; 1351250079Scarl entry->len = 0; 1352250079Scarl entry->flags = IF_NTB_LINK_DOWN_FLAG; 1353250079Scarl 1354250079Scarl mtx_lock(&qp->transport->tx_lock); 1355250079Scarl rc = ntb_process_tx(qp, entry); 1356250079Scarl if (rc != 0) 1357250079Scarl printf("ntb: Failed to send link down\n"); 1358250079Scarl mtx_unlock(&qp->transport->tx_lock); 1359250079Scarl} 1360250079Scarl 1361250079Scarl 1362250079Scarl/* List Management */ 1363250079Scarl 1364250079Scarlstatic void 1365250079Scarlntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 1366250079Scarl struct ntb_queue_list *list) 1367250079Scarl{ 1368250079Scarl 1369250079Scarl mtx_lock_spin(lock); 1370250079Scarl STAILQ_INSERT_TAIL(list, entry, entry); 1371250079Scarl mtx_unlock_spin(lock); 1372250079Scarl} 1373250079Scarl 1374250079Scarlstatic struct ntb_queue_entry * 1375250079Scarlntb_list_rm(struct mtx *lock, struct ntb_queue_list *list) 1376250079Scarl{ 1377250079Scarl struct ntb_queue_entry *entry; 1378250079Scarl 1379250079Scarl mtx_lock_spin(lock); 1380250079Scarl if (STAILQ_EMPTY(list)) { 1381250079Scarl entry = NULL; 1382250079Scarl goto out; 1383250079Scarl } 1384250079Scarl entry = STAILQ_FIRST(list); 1385250079Scarl STAILQ_REMOVE_HEAD(list, entry); 1386250079Scarlout: 1387250079Scarl mtx_unlock_spin(lock); 1388250079Scarl 1389250079Scarl return (entry); 1390250079Scarl} 1391250079Scarl 1392250079Scarl/* Helper functions */ 1393250079Scarl/* TODO: This too should really be part of the kernel */ 1394250079Scarl#define EUI48_MULTICAST 1 << 0 1395250079Scarl#define EUI48_LOCALLY_ADMINISTERED 1 << 1 1396250079Scarlstatic void 1397250079Scarlcreate_random_local_eui48(u_char *eaddr) 1398250079Scarl{ 1399250079Scarl static uint8_t counter = 0; 1400250079Scarl uint32_t seed = ticks; 1401250079Scarl 1402250079Scarl eaddr[0] = EUI48_LOCALLY_ADMINISTERED; 1403250079Scarl memcpy(&eaddr[1], &seed, sizeof(uint32_t)); 1404250079Scarl eaddr[5] = counter++; 1405250079Scarl} 1406250079Scarl 1407250079Scarl/** 1408250079Scarl * ntb_transport_max_size - Query the max payload size of a qp 1409250079Scarl * @qp: NTB transport layer queue to be queried 1410250079Scarl * 1411250079Scarl * Query the maximum payload size permissible on the given qp 1412250079Scarl * 1413250079Scarl * RETURNS: the max payload size of a qp 1414250079Scarl */ 1415250079Scarlstatic unsigned int 1416250079Scarlntb_transport_max_size(struct ntb_transport_qp *qp) 1417250079Scarl{ 1418250079Scarl 1419250079Scarl if (qp == NULL) 1420250079Scarl return (0); 1421250079Scarl 1422250079Scarl return (qp->tx_max_frame - sizeof(struct ntb_payload_header)); 1423250079Scarl} 1424