ntb_transport.c revision 289273
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 289273 2015-10-13 23:42:13Z 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> 42289207Scem#include <sys/sysctl.h> 43250079Scarl#include <sys/taskqueue.h> 44250079Scarl#include <net/if.h> 45250079Scarl#include <net/if_media.h> 46250079Scarl#include <net/if_types.h> 47250079Scarl#include <net/if_var.h> 48250079Scarl#include <net/bpf.h> 49250079Scarl#include <net/ethernet.h> 50250079Scarl#include <vm/vm.h> 51250079Scarl#include <vm/pmap.h> 52250079Scarl#include <machine/bus.h> 53250079Scarl#include <machine/cpufunc.h> 54250079Scarl#include <machine/pmap.h> 55250079Scarl 56250079Scarl#include "../ntb_hw/ntb_hw.h" 57250079Scarl 58250079Scarl/* 59250079Scarl * The Non-Transparent Bridge (NTB) is a device on some Intel processors that 60250079Scarl * allows you to connect two systems using a PCI-e link. 61250079Scarl * 62250079Scarl * This module contains a protocol for sending and receiving messages, and 63250079Scarl * exposes that protocol through a simulated ethernet device called ntb. 64250079Scarl * 65250079Scarl * NOTE: Much of the code in this module is shared with Linux. Any patches may 66250079Scarl * be picked up and redistributed in Linux with a dual GPL/BSD license. 67250079Scarl */ 68250079Scarl 69250079Scarl/* TODO: These functions should really be part of the kernel */ 70250079Scarl#define test_bit(pos, bitmap_addr) (*(bitmap_addr) & 1UL << (pos)) 71250079Scarl#define set_bit(pos, bitmap_addr) *(bitmap_addr) |= 1UL << (pos) 72250079Scarl#define clear_bit(pos, bitmap_addr) *(bitmap_addr) &= ~(1UL << (pos)) 73250079Scarl 74250079Scarl#define KTR_NTB KTR_SPARE3 75250079Scarl 76250079Scarl#define NTB_TRANSPORT_VERSION 3 77250079Scarl#define NTB_RX_MAX_PKTS 64 78250079Scarl#define NTB_RXQ_SIZE 300 79250079Scarl 80250079Scarlstatic unsigned int transport_mtu = 0x4000 + ETHER_HDR_LEN + ETHER_CRC_LEN; 81289208Scem 82289208Scem/* 83289208Scem * This is an oversimplification to work around Xeon Errata. The second client 84289208Scem * may be usable for unidirectional traffic. 85289208Scem */ 86250079Scarlstatic unsigned int max_num_clients = 1; 87250079Scarl 88250079ScarlSTAILQ_HEAD(ntb_queue_list, ntb_queue_entry); 89250079Scarl 90250079Scarlstruct ntb_queue_entry { 91250079Scarl /* ntb_queue list reference */ 92250079Scarl STAILQ_ENTRY(ntb_queue_entry) entry; 93250079Scarl 94250079Scarl /* info on data to be transfered */ 95250079Scarl void *cb_data; 96250079Scarl void *buf; 97250079Scarl uint64_t len; 98250079Scarl uint64_t flags; 99250079Scarl}; 100250079Scarl 101250079Scarlstruct ntb_rx_info { 102250079Scarl unsigned int entry; 103250079Scarl}; 104250079Scarl 105250079Scarlstruct ntb_transport_qp { 106250079Scarl struct ntb_netdev *transport; 107250079Scarl struct ntb_softc *ntb; 108250079Scarl 109250079Scarl void *cb_data; 110250079Scarl 111250079Scarl bool client_ready; 112250079Scarl bool qp_link; 113255281Scarl uint8_t qp_num; /* Only 64 QPs are allowed. 0-63 */ 114250079Scarl 115250079Scarl struct ntb_rx_info *rx_info; 116250079Scarl struct ntb_rx_info *remote_rx_info; 117250079Scarl 118250079Scarl void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, 119250079Scarl void *data, int len); 120250079Scarl struct ntb_queue_list tx_free_q; 121250079Scarl struct mtx ntb_tx_free_q_lock; 122250079Scarl void *tx_mw; 123250079Scarl uint64_t tx_index; 124250079Scarl uint64_t tx_max_entry; 125250079Scarl uint64_t tx_max_frame; 126250079Scarl 127250079Scarl void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, 128250079Scarl void *data, int len); 129250079Scarl struct ntb_queue_list rx_pend_q; 130250079Scarl struct ntb_queue_list rx_free_q; 131250079Scarl struct mtx ntb_rx_pend_q_lock; 132250079Scarl struct mtx ntb_rx_free_q_lock; 133250079Scarl struct task rx_completion_task; 134250079Scarl void *rx_buff; 135250079Scarl uint64_t rx_index; 136250079Scarl uint64_t rx_max_entry; 137250079Scarl uint64_t rx_max_frame; 138250079Scarl 139250079Scarl void (*event_handler) (void *data, int status); 140250079Scarl struct callout link_work; 141250079Scarl struct callout queue_full; 142250079Scarl struct callout rx_full; 143250079Scarl 144250079Scarl uint64_t last_rx_no_buf; 145250079Scarl 146250079Scarl /* Stats */ 147250079Scarl uint64_t rx_bytes; 148250079Scarl uint64_t rx_pkts; 149250079Scarl uint64_t rx_ring_empty; 150250079Scarl uint64_t rx_err_no_buf; 151250079Scarl uint64_t rx_err_oflow; 152250079Scarl uint64_t rx_err_ver; 153250079Scarl uint64_t tx_bytes; 154250079Scarl uint64_t tx_pkts; 155250079Scarl uint64_t tx_ring_full; 156250079Scarl}; 157250079Scarl 158250079Scarlstruct ntb_queue_handlers { 159250079Scarl void (*rx_handler) (struct ntb_transport_qp *qp, void *qp_data, 160250079Scarl void *data, int len); 161250079Scarl void (*tx_handler) (struct ntb_transport_qp *qp, void *qp_data, 162250079Scarl void *data, int len); 163250079Scarl void (*event_handler) (void *data, int status); 164250079Scarl}; 165250079Scarl 166250079Scarl 167250079Scarlstruct ntb_transport_mw { 168250079Scarl size_t size; 169250079Scarl void *virt_addr; 170250079Scarl vm_paddr_t dma_addr; 171250079Scarl}; 172250079Scarl 173250079Scarlstruct ntb_netdev { 174250079Scarl struct ntb_softc *ntb; 175250079Scarl struct ifnet *ifp; 176250079Scarl struct ntb_transport_mw mw[NTB_NUM_MW]; 177250079Scarl struct ntb_transport_qp *qps; 178250079Scarl uint64_t max_qps; 179250079Scarl uint64_t qp_bitmap; 180250079Scarl bool transport_link; 181250079Scarl struct callout link_work; 182250079Scarl struct ntb_transport_qp *qp; 183250079Scarl uint64_t bufsize; 184250079Scarl u_char eaddr[ETHER_ADDR_LEN]; 185250079Scarl struct mtx tx_lock; 186250079Scarl struct mtx rx_lock; 187250079Scarl}; 188250079Scarl 189250079Scarlstatic struct ntb_netdev net_softc; 190250079Scarl 191250079Scarlenum { 192250079Scarl IF_NTB_DESC_DONE_FLAG = 1 << 0, 193250079Scarl IF_NTB_LINK_DOWN_FLAG = 1 << 1, 194250079Scarl}; 195250079Scarl 196250079Scarlstruct ntb_payload_header { 197250079Scarl uint64_t ver; 198250079Scarl uint64_t len; 199250079Scarl uint64_t flags; 200250079Scarl}; 201250079Scarl 202250079Scarlenum { 203289153Scem /* 204289153Scem * The order of this enum is part of the if_ntb remote protocol. Do 205289153Scem * not reorder without bumping protocol version (and it's probably best 206289153Scem * to keep the protocol in lock-step with the Linux NTB driver. 207289153Scem */ 208250079Scarl IF_NTB_VERSION = 0, 209289153Scem IF_NTB_QP_LINKS, 210250079Scarl IF_NTB_NUM_QPS, 211289153Scem IF_NTB_NUM_MWS, 212289153Scem /* 213289153Scem * N.B.: transport_link_work assumes MW1 enums = MW0 + 2. 214289153Scem */ 215289153Scem IF_NTB_MW0_SZ_HIGH, 216289153Scem IF_NTB_MW0_SZ_LOW, 217289153Scem IF_NTB_MW1_SZ_HIGH, 218289153Scem IF_NTB_MW1_SZ_LOW, 219250079Scarl IF_NTB_MAX_SPAD, 220250079Scarl}; 221250079Scarl 222250079Scarl#define QP_TO_MW(qp) ((qp) % NTB_NUM_MW) 223250079Scarl#define NTB_QP_DEF_NUM_ENTRIES 100 224250079Scarl#define NTB_LINK_DOWN_TIMEOUT 10 225250079Scarl 226250079Scarlstatic int ntb_handle_module_events(struct module *m, int what, void *arg); 227250079Scarlstatic int ntb_setup_interface(void); 228250079Scarlstatic int ntb_teardown_interface(void); 229250079Scarlstatic void ntb_net_init(void *arg); 230250079Scarlstatic int ntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data); 231250079Scarlstatic void ntb_start(struct ifnet *ifp); 232250079Scarlstatic void ntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, 233250079Scarl void *data, int len); 234250079Scarlstatic void ntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, 235250079Scarl void *data, int len); 236250079Scarlstatic void ntb_net_event_handler(void *data, int status); 237250079Scarlstatic int ntb_transport_init(struct ntb_softc *ntb); 238250079Scarlstatic void ntb_transport_free(void *transport); 239250079Scarlstatic void ntb_transport_init_queue(struct ntb_netdev *nt, 240250079Scarl unsigned int qp_num); 241250079Scarlstatic void ntb_transport_free_queue(struct ntb_transport_qp *qp); 242250079Scarlstatic struct ntb_transport_qp * ntb_transport_create_queue(void *data, 243250079Scarl struct ntb_softc *pdev, const struct ntb_queue_handlers *handlers); 244250079Scarlstatic void ntb_transport_link_up(struct ntb_transport_qp *qp); 245250079Scarlstatic int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, 246250079Scarl void *data, unsigned int len); 247250079Scarlstatic int ntb_process_tx(struct ntb_transport_qp *qp, 248250079Scarl struct ntb_queue_entry *entry); 249250079Scarlstatic void ntb_tx_copy_task(struct ntb_transport_qp *qp, 250250079Scarl struct ntb_queue_entry *entry, void *offset); 251250079Scarlstatic void ntb_qp_full(void *arg); 252250079Scarlstatic void ntb_transport_rxc_db(void *data, int db_num); 253250079Scarlstatic void ntb_rx_pendq_full(void *arg); 254250079Scarlstatic void ntb_transport_rx(struct ntb_transport_qp *qp); 255250079Scarlstatic int ntb_process_rxc(struct ntb_transport_qp *qp); 256250079Scarlstatic void ntb_rx_copy_task(struct ntb_transport_qp *qp, 257250079Scarl struct ntb_queue_entry *entry, void *offset); 258250079Scarlstatic void ntb_rx_completion_task(void *arg, int pending); 259250079Scarlstatic void ntb_transport_event_callback(void *data, enum ntb_hw_event event); 260250079Scarlstatic void ntb_transport_link_work(void *arg); 261250079Scarlstatic int ntb_set_mw(struct ntb_netdev *nt, int num_mw, unsigned int size); 262289153Scemstatic void ntb_free_mw(struct ntb_netdev *nt, int num_mw); 263250079Scarlstatic void ntb_transport_setup_qp_mw(struct ntb_netdev *nt, 264250079Scarl unsigned int qp_num); 265250079Scarlstatic void ntb_qp_link_work(void *arg); 266250079Scarlstatic void ntb_transport_link_cleanup(struct ntb_netdev *nt); 267250079Scarlstatic void ntb_qp_link_down(struct ntb_transport_qp *qp); 268250079Scarlstatic void ntb_qp_link_cleanup(struct ntb_transport_qp *qp); 269250079Scarlstatic void ntb_transport_link_down(struct ntb_transport_qp *qp); 270250079Scarlstatic void ntb_send_link_down(struct ntb_transport_qp *qp); 271250079Scarlstatic void ntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 272250079Scarl struct ntb_queue_list *list); 273250079Scarlstatic struct ntb_queue_entry *ntb_list_rm(struct mtx *lock, 274250079Scarl struct ntb_queue_list *list); 275250079Scarlstatic void create_random_local_eui48(u_char *eaddr); 276250079Scarlstatic unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp); 277250079Scarl 278250079ScarlMALLOC_DEFINE(M_NTB_IF, "if_ntb", "ntb network driver"); 279250079Scarl 280250079Scarl/* Module setup and teardown */ 281250079Scarlstatic int 282250079Scarlntb_handle_module_events(struct module *m, int what, void *arg) 283250079Scarl{ 284250079Scarl int err = 0; 285250079Scarl 286250079Scarl switch (what) { 287250079Scarl case MOD_LOAD: 288250079Scarl err = ntb_setup_interface(); 289250079Scarl break; 290250079Scarl case MOD_UNLOAD: 291250079Scarl err = ntb_teardown_interface(); 292250079Scarl break; 293250079Scarl default: 294250079Scarl err = EOPNOTSUPP; 295250079Scarl break; 296250079Scarl } 297250079Scarl return (err); 298250079Scarl} 299250079Scarl 300255271Scarlstatic moduledata_t if_ntb_mod = { 301255271Scarl "if_ntb", 302250079Scarl ntb_handle_module_events, 303250079Scarl NULL 304250079Scarl}; 305250079Scarl 306255271ScarlDECLARE_MODULE(if_ntb, if_ntb_mod, SI_SUB_KLD, SI_ORDER_ANY); 307255271ScarlMODULE_DEPEND(if_ntb, ntb_hw, 1, 1, 1); 308250079Scarl 309250079Scarlstatic int 310289209Scemntb_setup_interface(void) 311250079Scarl{ 312250079Scarl struct ifnet *ifp; 313250079Scarl struct ntb_queue_handlers handlers = { ntb_net_rx_handler, 314250079Scarl ntb_net_tx_handler, ntb_net_event_handler }; 315250079Scarl 316250079Scarl net_softc.ntb = devclass_get_softc(devclass_find("ntb_hw"), 0); 317250079Scarl if (net_softc.ntb == NULL) { 318255281Scarl printf("ntb: Cannot find devclass\n"); 319250079Scarl return (ENXIO); 320250079Scarl } 321250079Scarl 322250079Scarl ntb_transport_init(net_softc.ntb); 323250079Scarl 324250079Scarl ifp = net_softc.ifp = if_alloc(IFT_ETHER); 325250079Scarl if (ifp == NULL) { 326250079Scarl printf("ntb: cannot allocate ifnet structure\n"); 327250079Scarl return (ENOMEM); 328250079Scarl } 329250079Scarl 330250079Scarl net_softc.qp = ntb_transport_create_queue(ifp, net_softc.ntb, 331250079Scarl &handlers); 332250079Scarl if_initname(ifp, "ntb", 0); 333250079Scarl ifp->if_init = ntb_net_init; 334250079Scarl ifp->if_softc = &net_softc; 335250079Scarl ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 336250079Scarl ifp->if_ioctl = ntb_ioctl; 337250079Scarl ifp->if_start = ntb_start; 338250079Scarl IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN); 339250079Scarl ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN; 340250079Scarl IFQ_SET_READY(&ifp->if_snd); 341250079Scarl create_random_local_eui48(net_softc.eaddr); 342250079Scarl ether_ifattach(ifp, net_softc.eaddr); 343250079Scarl ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_JUMBO_MTU; 344250079Scarl ifp->if_capenable = ifp->if_capabilities; 345250079Scarl 346250079Scarl ntb_transport_link_up(net_softc.qp); 347250079Scarl net_softc.bufsize = ntb_transport_max_size(net_softc.qp) + 348250079Scarl sizeof(struct ether_header); 349250079Scarl return (0); 350250079Scarl} 351250079Scarl 352250079Scarlstatic int 353289209Scemntb_teardown_interface(void) 354250079Scarl{ 355250079Scarl 356255280Scarl if (net_softc.qp != NULL) 357255280Scarl ntb_transport_link_down(net_softc.qp); 358250079Scarl 359255280Scarl if (net_softc.ifp != NULL) { 360255280Scarl ether_ifdetach(net_softc.ifp); 361255280Scarl if_free(net_softc.ifp); 362255280Scarl } 363250079Scarl 364255280Scarl if (net_softc.qp != NULL) { 365255280Scarl ntb_transport_free_queue(net_softc.qp); 366255280Scarl ntb_transport_free(&net_softc); 367255280Scarl } 368255280Scarl 369250079Scarl return (0); 370250079Scarl} 371250079Scarl 372250079Scarl/* Network device interface */ 373250079Scarl 374250079Scarlstatic void 375250079Scarlntb_net_init(void *arg) 376250079Scarl{ 377250079Scarl struct ntb_netdev *ntb_softc = arg; 378250079Scarl struct ifnet *ifp = ntb_softc->ifp; 379250079Scarl 380250079Scarl ifp->if_drv_flags |= IFF_DRV_RUNNING; 381250079Scarl ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 382250079Scarl ifp->if_flags |= IFF_UP; 383250079Scarl if_link_state_change(ifp, LINK_STATE_UP); 384250079Scarl} 385250079Scarl 386250079Scarlstatic int 387250079Scarlntb_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 388250079Scarl{ 389250079Scarl struct ntb_netdev *nt = ifp->if_softc; 390250079Scarl struct ifreq *ifr = (struct ifreq *)data; 391250079Scarl int error = 0; 392250079Scarl 393250079Scarl switch (command) { 394250079Scarl case SIOCSIFMTU: 395250079Scarl { 396250079Scarl if (ifr->ifr_mtu > ntb_transport_max_size(nt->qp) - 397250079Scarl ETHER_HDR_LEN - ETHER_CRC_LEN) { 398250079Scarl error = EINVAL; 399250079Scarl break; 400250079Scarl } 401250079Scarl 402250079Scarl ifp->if_mtu = ifr->ifr_mtu; 403250079Scarl break; 404250079Scarl } 405250079Scarl default: 406250079Scarl error = ether_ioctl(ifp, command, data); 407250079Scarl break; 408250079Scarl } 409250079Scarl 410250079Scarl return (error); 411250079Scarl} 412250079Scarl 413250079Scarl 414250079Scarlstatic void 415250079Scarlntb_start(struct ifnet *ifp) 416250079Scarl{ 417250079Scarl struct mbuf *m_head; 418250079Scarl struct ntb_netdev *nt = ifp->if_softc; 419250079Scarl int rc; 420250079Scarl 421250079Scarl mtx_lock(&nt->tx_lock); 422250079Scarl ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 423250079Scarl CTR0(KTR_NTB, "TX: ntb_start"); 424250079Scarl while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) { 425250079Scarl IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head); 426250079Scarl CTR1(KTR_NTB, "TX: start mbuf %p", m_head); 427250079Scarl rc = ntb_transport_tx_enqueue(nt->qp, m_head, m_head, 428250079Scarl m_length(m_head, NULL)); 429250079Scarl if (rc != 0) { 430250079Scarl CTR1(KTR_NTB, 431255281Scarl "TX: could not tx mbuf %p. Returning to snd q", 432250079Scarl m_head); 433250079Scarl if (rc == EAGAIN) { 434250079Scarl ifp->if_drv_flags |= IFF_DRV_OACTIVE; 435250079Scarl IFQ_DRV_PREPEND(&ifp->if_snd, m_head); 436250079Scarl callout_reset(&nt->qp->queue_full, hz / 1000, 437250079Scarl ntb_qp_full, ifp); 438250079Scarl } 439250079Scarl break; 440250079Scarl } 441250079Scarl 442250079Scarl } 443250079Scarl mtx_unlock(&nt->tx_lock); 444250079Scarl} 445250079Scarl 446250079Scarl/* Network Device Callbacks */ 447250079Scarlstatic void 448250079Scarlntb_net_tx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 449250079Scarl int len) 450250079Scarl{ 451250079Scarl 452250079Scarl m_freem(data); 453250079Scarl CTR1(KTR_NTB, "TX: tx_handler freeing mbuf %p", data); 454250079Scarl} 455250079Scarl 456250079Scarlstatic void 457250079Scarlntb_net_rx_handler(struct ntb_transport_qp *qp, void *qp_data, void *data, 458250079Scarl int len) 459250079Scarl{ 460250079Scarl struct mbuf *m = data; 461250079Scarl struct ifnet *ifp = qp_data; 462250079Scarl 463250079Scarl CTR0(KTR_NTB, "RX: rx handler"); 464250079Scarl (*ifp->if_input)(ifp, m); 465250079Scarl} 466250079Scarl 467250079Scarlstatic void 468250079Scarlntb_net_event_handler(void *data, int status) 469250079Scarl{ 470250079Scarl 471250079Scarl} 472250079Scarl 473250079Scarl/* Transport Init and teardown */ 474250079Scarl 475250079Scarlstatic int 476250079Scarlntb_transport_init(struct ntb_softc *ntb) 477250079Scarl{ 478250079Scarl struct ntb_netdev *nt = &net_softc; 479250079Scarl int rc, i; 480250079Scarl 481250079Scarl nt->max_qps = max_num_clients; 482250079Scarl ntb_register_transport(ntb, nt); 483250079Scarl mtx_init(&nt->tx_lock, "ntb transport tx", NULL, MTX_DEF); 484250079Scarl mtx_init(&nt->rx_lock, "ntb transport rx", NULL, MTX_DEF); 485250079Scarl 486250079Scarl nt->qps = malloc(nt->max_qps * sizeof(struct ntb_transport_qp), 487250079Scarl M_NTB_IF, M_WAITOK|M_ZERO); 488250079Scarl 489250079Scarl nt->qp_bitmap = ((uint64_t) 1 << nt->max_qps) - 1; 490250079Scarl 491250079Scarl for (i = 0; i < nt->max_qps; i++) 492250079Scarl ntb_transport_init_queue(nt, i); 493250079Scarl 494250079Scarl callout_init(&nt->link_work, 0); 495250079Scarl 496250079Scarl rc = ntb_register_event_callback(ntb, 497250079Scarl ntb_transport_event_callback); 498250079Scarl if (rc != 0) 499250079Scarl goto err; 500250079Scarl 501255268Scarl if (ntb_query_link_status(ntb)) { 502255268Scarl if (bootverbose) 503255268Scarl device_printf(ntb_get_device(ntb), "link up\n"); 504250079Scarl callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 505255268Scarl } 506250079Scarl 507250079Scarl return (0); 508250079Scarl 509250079Scarlerr: 510250079Scarl free(nt->qps, M_NTB_IF); 511250079Scarl ntb_unregister_transport(ntb); 512250079Scarl return (rc); 513250079Scarl} 514250079Scarl 515250079Scarlstatic void 516250079Scarlntb_transport_free(void *transport) 517250079Scarl{ 518250079Scarl struct ntb_netdev *nt = transport; 519250079Scarl struct ntb_softc *ntb = nt->ntb; 520250079Scarl int i; 521250079Scarl 522289273Scem ntb_transport_link_cleanup(nt); 523250079Scarl 524250079Scarl callout_drain(&nt->link_work); 525250079Scarl 526255281Scarl /* verify that all the qps are freed */ 527250079Scarl for (i = 0; i < nt->max_qps; i++) 528250079Scarl if (!test_bit(i, &nt->qp_bitmap)) 529250079Scarl ntb_transport_free_queue(&nt->qps[i]); 530250079Scarl 531250079Scarl ntb_unregister_event_callback(ntb); 532250079Scarl 533250079Scarl for (i = 0; i < NTB_NUM_MW; i++) 534289153Scem ntb_free_mw(nt, i); 535250079Scarl 536250079Scarl free(nt->qps, M_NTB_IF); 537250079Scarl ntb_unregister_transport(ntb); 538250079Scarl} 539250079Scarl 540250079Scarlstatic void 541250079Scarlntb_transport_init_queue(struct ntb_netdev *nt, unsigned int qp_num) 542250079Scarl{ 543250079Scarl struct ntb_transport_qp *qp; 544250079Scarl unsigned int num_qps_mw, tx_size; 545250079Scarl uint8_t mw_num = QP_TO_MW(qp_num); 546250079Scarl 547250079Scarl qp = &nt->qps[qp_num]; 548250079Scarl qp->qp_num = qp_num; 549250079Scarl qp->transport = nt; 550250079Scarl qp->ntb = nt->ntb; 551250079Scarl qp->qp_link = NTB_LINK_DOWN; 552250079Scarl qp->client_ready = NTB_LINK_DOWN; 553250079Scarl qp->event_handler = NULL; 554250079Scarl 555250079Scarl if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) 556250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; 557250079Scarl else 558250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW; 559250079Scarl 560250079Scarl tx_size = (unsigned int) ntb_get_mw_size(qp->ntb, mw_num) / num_qps_mw; 561250079Scarl qp->rx_info = (struct ntb_rx_info *) 562250079Scarl ((char *)ntb_get_mw_vbase(qp->ntb, mw_num) + 563250079Scarl (qp_num / NTB_NUM_MW * tx_size)); 564250079Scarl tx_size -= sizeof(struct ntb_rx_info); 565250079Scarl 566289152Scem qp->tx_mw = qp->rx_info + 1; 567289156Scem /* Due to house-keeping, there must be at least 2 buffs */ 568250079Scarl qp->tx_max_frame = min(transport_mtu + sizeof(struct ntb_payload_header), 569289156Scem tx_size / 2); 570250079Scarl qp->tx_max_entry = tx_size / qp->tx_max_frame; 571250079Scarl 572250079Scarl callout_init(&qp->link_work, 0); 573283291Sjkim callout_init(&qp->queue_full, 1); 574283291Sjkim callout_init(&qp->rx_full, 1); 575250079Scarl 576250079Scarl mtx_init(&qp->ntb_rx_pend_q_lock, "ntb rx pend q", NULL, MTX_SPIN); 577250079Scarl mtx_init(&qp->ntb_rx_free_q_lock, "ntb rx free q", NULL, MTX_SPIN); 578250079Scarl mtx_init(&qp->ntb_tx_free_q_lock, "ntb tx free q", NULL, MTX_SPIN); 579250079Scarl TASK_INIT(&qp->rx_completion_task, 0, ntb_rx_completion_task, qp); 580250079Scarl 581250079Scarl STAILQ_INIT(&qp->rx_pend_q); 582250079Scarl STAILQ_INIT(&qp->rx_free_q); 583250079Scarl STAILQ_INIT(&qp->tx_free_q); 584250079Scarl} 585250079Scarl 586250079Scarlstatic void 587250079Scarlntb_transport_free_queue(struct ntb_transport_qp *qp) 588250079Scarl{ 589250079Scarl struct ntb_queue_entry *entry; 590250079Scarl 591250079Scarl if (qp == NULL) 592250079Scarl return; 593250079Scarl 594250079Scarl callout_drain(&qp->link_work); 595250079Scarl 596250079Scarl ntb_unregister_db_callback(qp->ntb, qp->qp_num); 597250079Scarl 598250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 599250079Scarl free(entry, M_NTB_IF); 600250079Scarl 601250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q))) 602250079Scarl free(entry, M_NTB_IF); 603250079Scarl 604250079Scarl while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 605250079Scarl free(entry, M_NTB_IF); 606250079Scarl 607250079Scarl set_bit(qp->qp_num, &qp->transport->qp_bitmap); 608250079Scarl} 609250079Scarl 610250079Scarl/** 611250079Scarl * ntb_transport_create_queue - Create a new NTB transport layer queue 612250079Scarl * @rx_handler: receive callback function 613250079Scarl * @tx_handler: transmit callback function 614250079Scarl * @event_handler: event callback function 615250079Scarl * 616250079Scarl * Create a new NTB transport layer queue and provide the queue with a callback 617250079Scarl * routine for both transmit and receive. The receive callback routine will be 618250079Scarl * used to pass up data when the transport has received it on the queue. The 619250079Scarl * transmit callback routine will be called when the transport has completed the 620250079Scarl * transmission of the data on the queue and the data is ready to be freed. 621250079Scarl * 622250079Scarl * RETURNS: pointer to newly created ntb_queue, NULL on error. 623250079Scarl */ 624250079Scarlstatic struct ntb_transport_qp * 625250079Scarlntb_transport_create_queue(void *data, struct ntb_softc *pdev, 626250079Scarl const struct ntb_queue_handlers *handlers) 627250079Scarl{ 628250079Scarl struct ntb_queue_entry *entry; 629250079Scarl struct ntb_transport_qp *qp; 630250079Scarl struct ntb_netdev *nt; 631250079Scarl unsigned int free_queue; 632250079Scarl int rc, i; 633250079Scarl 634250079Scarl nt = ntb_find_transport(pdev); 635250079Scarl if (nt == NULL) 636250079Scarl goto err; 637250079Scarl 638250079Scarl free_queue = ffs(nt->qp_bitmap); 639250079Scarl if (free_queue == 0) 640250079Scarl goto err; 641250079Scarl 642250079Scarl /* decrement free_queue to make it zero based */ 643250079Scarl free_queue--; 644250079Scarl 645250079Scarl clear_bit(free_queue, &nt->qp_bitmap); 646250079Scarl 647250079Scarl qp = &nt->qps[free_queue]; 648250079Scarl qp->cb_data = data; 649250079Scarl qp->rx_handler = handlers->rx_handler; 650250079Scarl qp->tx_handler = handlers->tx_handler; 651250079Scarl qp->event_handler = handlers->event_handler; 652250079Scarl 653250079Scarl for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 654250079Scarl entry = malloc(sizeof(struct ntb_queue_entry), M_NTB_IF, 655250079Scarl M_WAITOK|M_ZERO); 656250079Scarl entry->cb_data = nt->ifp; 657250079Scarl entry->buf = NULL; 658250079Scarl entry->len = transport_mtu; 659250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 660250079Scarl } 661250079Scarl 662250079Scarl for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { 663250079Scarl entry = malloc(sizeof(struct ntb_queue_entry), M_NTB_IF, 664250079Scarl M_WAITOK|M_ZERO); 665250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 666250079Scarl } 667250079Scarl 668250079Scarl rc = ntb_register_db_callback(qp->ntb, free_queue, qp, 669250079Scarl ntb_transport_rxc_db); 670250079Scarl if (rc != 0) 671250079Scarl goto err1; 672250079Scarl 673250079Scarl return (qp); 674250079Scarl 675250079Scarlerr1: 676250079Scarl while ((entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q))) 677250079Scarl free(entry, M_NTB_IF); 678250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) 679250079Scarl free(entry, M_NTB_IF); 680250079Scarl set_bit(free_queue, &nt->qp_bitmap); 681250079Scarlerr: 682250079Scarl return (NULL); 683250079Scarl} 684250079Scarl 685250079Scarl/** 686250079Scarl * ntb_transport_link_up - Notify NTB transport of client readiness to use queue 687250079Scarl * @qp: NTB transport layer queue to be enabled 688250079Scarl * 689250079Scarl * Notify NTB transport layer of client readiness to use queue 690250079Scarl */ 691250079Scarlstatic void 692250079Scarlntb_transport_link_up(struct ntb_transport_qp *qp) 693250079Scarl{ 694250079Scarl 695250079Scarl if (qp == NULL) 696250079Scarl return; 697250079Scarl 698250079Scarl qp->client_ready = NTB_LINK_UP; 699255268Scarl if (bootverbose) 700255268Scarl device_printf(ntb_get_device(qp->ntb), "qp client ready\n"); 701250079Scarl 702250079Scarl if (qp->transport->transport_link == NTB_LINK_UP) 703250079Scarl callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 704250079Scarl} 705250079Scarl 706250079Scarl 707250079Scarl 708250079Scarl/* Transport Tx */ 709250079Scarl 710250079Scarl/** 711250079Scarl * ntb_transport_tx_enqueue - Enqueue a new NTB queue entry 712250079Scarl * @qp: NTB transport layer queue the entry is to be enqueued on 713250079Scarl * @cb: per buffer pointer for callback function to use 714250079Scarl * @data: pointer to data buffer that will be sent 715250079Scarl * @len: length of the data buffer 716250079Scarl * 717250079Scarl * Enqueue a new transmit buffer onto the transport queue from which a NTB 718289266Scem * payload will be transmitted. This assumes that a lock is being held to 719250079Scarl * serialize access to the qp. 720250079Scarl * 721250079Scarl * RETURNS: An appropriate ERRNO error value on error, or zero for success. 722250079Scarl */ 723250079Scarlstatic int 724250079Scarlntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data, 725250079Scarl unsigned int len) 726250079Scarl{ 727250079Scarl struct ntb_queue_entry *entry; 728250079Scarl int rc; 729250079Scarl 730250079Scarl if (qp == NULL || qp->qp_link != NTB_LINK_UP || len == 0) { 731250079Scarl CTR0(KTR_NTB, "TX: link not up"); 732250079Scarl return (EINVAL); 733250079Scarl } 734250079Scarl 735250079Scarl entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 736250079Scarl if (entry == NULL) { 737255281Scarl CTR0(KTR_NTB, "TX: could not get entry from tx_free_q"); 738250079Scarl return (ENOMEM); 739250079Scarl } 740250079Scarl CTR1(KTR_NTB, "TX: got entry %p from tx_free_q", entry); 741250079Scarl 742250079Scarl entry->cb_data = cb; 743250079Scarl entry->buf = data; 744250079Scarl entry->len = len; 745250079Scarl entry->flags = 0; 746250079Scarl 747250079Scarl rc = ntb_process_tx(qp, entry); 748250079Scarl if (rc != 0) { 749250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 750250079Scarl CTR1(KTR_NTB, 751250079Scarl "TX: process_tx failed. Returning entry %p to tx_free_q", 752250079Scarl entry); 753250079Scarl } 754250079Scarl return (rc); 755250079Scarl} 756250079Scarl 757250079Scarlstatic int 758250079Scarlntb_process_tx(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry) 759250079Scarl{ 760250079Scarl void *offset; 761250079Scarl 762250079Scarl offset = (char *)qp->tx_mw + qp->tx_max_frame * qp->tx_index; 763250079Scarl CTR3(KTR_NTB, 764250079Scarl "TX: process_tx: tx_pkts=%u, tx_index=%u, remote entry=%u", 765250079Scarl qp->tx_pkts, qp->tx_index, qp->remote_rx_info->entry); 766250079Scarl if (qp->tx_index == qp->remote_rx_info->entry) { 767250079Scarl CTR0(KTR_NTB, "TX: ring full"); 768250079Scarl qp->tx_ring_full++; 769250079Scarl return (EAGAIN); 770250079Scarl } 771250079Scarl 772250079Scarl if (entry->len > qp->tx_max_frame - sizeof(struct ntb_payload_header)) { 773250079Scarl if (qp->tx_handler != NULL) 774250079Scarl qp->tx_handler(qp, qp->cb_data, entry->buf, 775250079Scarl EIO); 776250079Scarl 777250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 778250079Scarl CTR1(KTR_NTB, 779250079Scarl "TX: frame too big. returning entry %p to tx_free_q", 780250079Scarl entry); 781250079Scarl return (0); 782250079Scarl } 783250079Scarl CTR2(KTR_NTB, "TX: copying entry %p to offset %p", entry, offset); 784250079Scarl ntb_tx_copy_task(qp, entry, offset); 785250079Scarl 786250079Scarl qp->tx_index++; 787250079Scarl qp->tx_index %= qp->tx_max_entry; 788250079Scarl 789250079Scarl qp->tx_pkts++; 790250079Scarl 791250079Scarl return (0); 792250079Scarl} 793250079Scarl 794250079Scarlstatic void 795250079Scarlntb_tx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 796250079Scarl void *offset) 797250079Scarl{ 798250079Scarl struct ntb_payload_header *hdr; 799250079Scarl 800250079Scarl CTR2(KTR_NTB, "TX: copying %d bytes to offset %p", entry->len, offset); 801250079Scarl if (entry->buf != NULL) 802250079Scarl m_copydata((struct mbuf *)entry->buf, 0, entry->len, offset); 803250079Scarl 804250079Scarl hdr = (struct ntb_payload_header *)((char *)offset + qp->tx_max_frame - 805250079Scarl sizeof(struct ntb_payload_header)); 806250079Scarl hdr->len = entry->len; /* TODO: replace with bus_space_write */ 807250079Scarl hdr->ver = qp->tx_pkts; /* TODO: replace with bus_space_write */ 808250079Scarl wmb(); 809250079Scarl /* TODO: replace with bus_space_write */ 810250079Scarl hdr->flags = entry->flags | IF_NTB_DESC_DONE_FLAG; 811250079Scarl 812289255Scem ntb_ring_doorbell(qp->ntb, qp->qp_num); 813250079Scarl 814250079Scarl /* 815250079Scarl * The entry length can only be zero if the packet is intended to be a 816250079Scarl * "link down" or similar. Since no payload is being sent in these 817250079Scarl * cases, there is nothing to add to the completion queue. 818250079Scarl */ 819250079Scarl if (entry->len > 0) { 820250079Scarl qp->tx_bytes += entry->len; 821250079Scarl 822250079Scarl if (qp->tx_handler) 823250079Scarl qp->tx_handler(qp, qp->cb_data, entry->cb_data, 824250079Scarl entry->len); 825250079Scarl } 826250079Scarl 827250079Scarl CTR2(KTR_NTB, 828250079Scarl "TX: entry %p sent. hdr->ver = %d, Returning to tx_free_q", entry, 829250079Scarl hdr->ver); 830250079Scarl ntb_list_add(&qp->ntb_tx_free_q_lock, entry, &qp->tx_free_q); 831250079Scarl} 832250079Scarl 833250079Scarlstatic void 834250079Scarlntb_qp_full(void *arg) 835250079Scarl{ 836250079Scarl 837250079Scarl CTR0(KTR_NTB, "TX: qp_full callout"); 838250079Scarl ntb_start(arg); 839250079Scarl} 840250079Scarl 841250079Scarl/* Transport Rx */ 842250079Scarlstatic void 843250079Scarlntb_transport_rxc_db(void *data, int db_num) 844250079Scarl{ 845250079Scarl struct ntb_transport_qp *qp = data; 846250079Scarl 847250079Scarl ntb_transport_rx(qp); 848250079Scarl} 849250079Scarl 850250079Scarlstatic void 851250079Scarlntb_rx_pendq_full(void *arg) 852250079Scarl{ 853250079Scarl 854250079Scarl CTR0(KTR_NTB, "RX: ntb_rx_pendq_full callout"); 855250079Scarl ntb_transport_rx(arg); 856250079Scarl} 857250079Scarl 858250079Scarlstatic void 859250079Scarlntb_transport_rx(struct ntb_transport_qp *qp) 860250079Scarl{ 861289157Scem uint64_t i; 862289157Scem int rc; 863250079Scarl 864250079Scarl /* 865250079Scarl * Limit the number of packets processed in a single interrupt to 866250079Scarl * provide fairness to others 867250079Scarl */ 868250079Scarl mtx_lock(&qp->transport->rx_lock); 869250079Scarl CTR0(KTR_NTB, "RX: transport_rx"); 870289157Scem for (i = 0; i < qp->rx_max_entry; i++) { 871250079Scarl rc = ntb_process_rxc(qp); 872250079Scarl if (rc != 0) { 873250079Scarl CTR0(KTR_NTB, "RX: process_rxc failed"); 874250079Scarl break; 875250079Scarl } 876250079Scarl } 877250079Scarl mtx_unlock(&qp->transport->rx_lock); 878250079Scarl} 879250079Scarl 880250079Scarlstatic int 881250079Scarlntb_process_rxc(struct ntb_transport_qp *qp) 882250079Scarl{ 883250079Scarl struct ntb_payload_header *hdr; 884250079Scarl struct ntb_queue_entry *entry; 885250079Scarl void *offset; 886250079Scarl 887250079Scarl offset = (void *) 888250079Scarl ((char *)qp->rx_buff + qp->rx_max_frame * qp->rx_index); 889250079Scarl hdr = (void *) 890250079Scarl ((char *)offset + qp->rx_max_frame - 891250079Scarl sizeof(struct ntb_payload_header)); 892250079Scarl 893250079Scarl CTR1(KTR_NTB, "RX: process_rxc rx_index = %u", qp->rx_index); 894250079Scarl entry = ntb_list_rm(&qp->ntb_rx_pend_q_lock, &qp->rx_pend_q); 895250079Scarl if (entry == NULL) { 896250079Scarl qp->rx_err_no_buf++; 897250079Scarl CTR0(KTR_NTB, "RX: No entries in rx_pend_q"); 898250079Scarl return (ENOMEM); 899250079Scarl } 900250079Scarl callout_stop(&qp->rx_full); 901250079Scarl CTR1(KTR_NTB, "RX: rx entry %p from rx_pend_q", entry); 902250079Scarl 903250079Scarl if ((hdr->flags & IF_NTB_DESC_DONE_FLAG) == 0) { 904250079Scarl CTR1(KTR_NTB, 905250079Scarl "RX: hdr not done. Returning entry %p to rx_pend_q", entry); 906250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 907250079Scarl qp->rx_ring_empty++; 908250079Scarl return (EAGAIN); 909250079Scarl } 910250079Scarl 911250079Scarl if (hdr->ver != (uint32_t) qp->rx_pkts) { 912250079Scarl CTR3(KTR_NTB,"RX: ver != rx_pkts (%x != %lx). " 913250079Scarl "Returning entry %p to rx_pend_q", hdr->ver, qp->rx_pkts, 914250079Scarl entry); 915250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 916250079Scarl qp->rx_err_ver++; 917250079Scarl return (EIO); 918250079Scarl } 919250079Scarl 920250079Scarl if ((hdr->flags & IF_NTB_LINK_DOWN_FLAG) != 0) { 921250079Scarl ntb_qp_link_down(qp); 922250079Scarl CTR1(KTR_NTB, 923250079Scarl "RX: link down. adding entry %p back to rx_pend_q", entry); 924250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 925250079Scarl goto out; 926250079Scarl } 927250079Scarl 928250079Scarl if (hdr->len <= entry->len) { 929250079Scarl entry->len = hdr->len; 930250079Scarl ntb_rx_copy_task(qp, entry, offset); 931250079Scarl } else { 932250079Scarl CTR1(KTR_NTB, 933250079Scarl "RX: len too long. Returning entry %p to rx_pend_q", entry); 934250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 935250079Scarl 936250079Scarl qp->rx_err_oflow++; 937250079Scarl } 938250079Scarl 939250079Scarl qp->rx_bytes += hdr->len; 940250079Scarl qp->rx_pkts++; 941250079Scarl CTR1(KTR_NTB, "RX: received %ld rx_pkts", qp->rx_pkts); 942250079Scarl 943250079Scarl 944250079Scarlout: 945250079Scarl /* Ensure that the data is globally visible before clearing the flag */ 946250079Scarl wmb(); 947250079Scarl hdr->flags = 0; 948250079Scarl /* TODO: replace with bus_space_write */ 949250079Scarl qp->rx_info->entry = qp->rx_index; 950250079Scarl 951250079Scarl qp->rx_index++; 952250079Scarl qp->rx_index %= qp->rx_max_entry; 953250079Scarl 954250079Scarl return (0); 955250079Scarl} 956250079Scarl 957250079Scarlstatic void 958250079Scarlntb_rx_copy_task(struct ntb_transport_qp *qp, struct ntb_queue_entry *entry, 959250079Scarl void *offset) 960250079Scarl{ 961250079Scarl struct ifnet *ifp = entry->cb_data; 962250079Scarl unsigned int len = entry->len; 963250079Scarl struct mbuf *m; 964250079Scarl 965250079Scarl CTR2(KTR_NTB, "RX: copying %d bytes from offset %p", len, offset); 966250079Scarl m = m_devget(offset, len, 0, ifp, NULL); 967250079Scarl m->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID; 968250079Scarl 969250079Scarl entry->buf = (void *)m; 970250079Scarl 971250079Scarl CTR2(KTR_NTB, 972250079Scarl "RX: copied entry %p to mbuf %p. Adding entry to rx_free_q", entry, 973250079Scarl m); 974250079Scarl ntb_list_add(&qp->ntb_rx_free_q_lock, entry, &qp->rx_free_q); 975250079Scarl 976250079Scarl taskqueue_enqueue(taskqueue_swi, &qp->rx_completion_task); 977250079Scarl} 978250079Scarl 979250079Scarlstatic void 980250079Scarlntb_rx_completion_task(void *arg, int pending) 981250079Scarl{ 982250079Scarl struct ntb_transport_qp *qp = arg; 983250079Scarl struct mbuf *m; 984250079Scarl struct ntb_queue_entry *entry; 985250079Scarl 986250079Scarl CTR0(KTR_NTB, "RX: rx_completion_task"); 987250079Scarl 988250079Scarl while ((entry = ntb_list_rm(&qp->ntb_rx_free_q_lock, &qp->rx_free_q))) { 989250079Scarl m = entry->buf; 990250079Scarl CTR2(KTR_NTB, "RX: completing entry %p, mbuf %p", entry, m); 991250079Scarl if (qp->rx_handler && qp->client_ready == NTB_LINK_UP) 992250079Scarl qp->rx_handler(qp, qp->cb_data, m, entry->len); 993250079Scarl 994250079Scarl entry->buf = NULL; 995250079Scarl entry->len = qp->transport->bufsize; 996250079Scarl 997250079Scarl CTR1(KTR_NTB,"RX: entry %p removed from rx_free_q " 998250079Scarl "and added to rx_pend_q", entry); 999250079Scarl ntb_list_add(&qp->ntb_rx_pend_q_lock, entry, &qp->rx_pend_q); 1000250079Scarl if (qp->rx_err_no_buf > qp->last_rx_no_buf) { 1001250079Scarl qp->last_rx_no_buf = qp->rx_err_no_buf; 1002250079Scarl CTR0(KTR_NTB, "RX: could spawn rx task"); 1003250079Scarl callout_reset(&qp->rx_full, hz / 1000, ntb_rx_pendq_full, 1004250079Scarl qp); 1005250079Scarl } 1006250079Scarl } 1007250079Scarl} 1008250079Scarl 1009250079Scarl/* Link Event handler */ 1010250079Scarlstatic void 1011250079Scarlntb_transport_event_callback(void *data, enum ntb_hw_event event) 1012250079Scarl{ 1013250079Scarl struct ntb_netdev *nt = data; 1014250079Scarl 1015250079Scarl switch (event) { 1016250079Scarl case NTB_EVENT_HW_LINK_UP: 1017255268Scarl if (bootverbose) 1018255268Scarl device_printf(ntb_get_device(nt->ntb), "HW link up\n"); 1019250079Scarl callout_reset(&nt->link_work, 0, ntb_transport_link_work, nt); 1020250079Scarl break; 1021250079Scarl case NTB_EVENT_HW_LINK_DOWN: 1022255268Scarl if (bootverbose) 1023255268Scarl device_printf(ntb_get_device(nt->ntb), "HW link down\n"); 1024250079Scarl ntb_transport_link_cleanup(nt); 1025250079Scarl break; 1026250079Scarl default: 1027250079Scarl panic("ntb: Unknown NTB event"); 1028250079Scarl } 1029250079Scarl} 1030250079Scarl 1031250079Scarl/* Link bring up */ 1032250079Scarlstatic void 1033250079Scarlntb_transport_link_work(void *arg) 1034250079Scarl{ 1035250079Scarl struct ntb_netdev *nt = arg; 1036250079Scarl struct ntb_softc *ntb = nt->ntb; 1037250079Scarl struct ntb_transport_qp *qp; 1038289153Scem uint64_t val64; 1039289208Scem uint32_t val, i, num_mw; 1040289208Scem int rc; 1041250079Scarl 1042289208Scem if (ntb_has_feature(ntb, NTB_REGS_THRU_MW)) 1043289208Scem num_mw = NTB_NUM_MW - 1; 1044289208Scem else 1045289208Scem num_mw = NTB_NUM_MW; 1046289208Scem 1047289153Scem /* send the local info, in the opposite order of the way we read it */ 1048289208Scem for (i = 0; i < num_mw; i++) { 1049289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1050289259Scem (uint64_t)ntb_get_mw_size(ntb, i) >> 32); 1051289153Scem if (rc != 0) 1052289153Scem goto out; 1053250079Scarl 1054289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), 1055289153Scem (uint32_t)ntb_get_mw_size(ntb, i)); 1056289153Scem if (rc != 0) 1057289153Scem goto out; 1058289153Scem } 1059250079Scarl 1060289208Scem rc = ntb_write_remote_spad(ntb, IF_NTB_NUM_MWS, num_mw); 1061250079Scarl if (rc != 0) 1062250079Scarl goto out; 1063250079Scarl 1064250079Scarl rc = ntb_write_remote_spad(ntb, IF_NTB_NUM_QPS, nt->max_qps); 1065250079Scarl if (rc != 0) 1066250079Scarl goto out; 1067250079Scarl 1068289153Scem rc = ntb_write_remote_spad(ntb, IF_NTB_VERSION, NTB_TRANSPORT_VERSION); 1069250079Scarl if (rc != 0) 1070250079Scarl goto out; 1071250079Scarl 1072250079Scarl /* Query the remote side for its info */ 1073250079Scarl rc = ntb_read_local_spad(ntb, IF_NTB_VERSION, &val); 1074250079Scarl if (rc != 0) 1075250079Scarl goto out; 1076250079Scarl 1077250079Scarl if (val != NTB_TRANSPORT_VERSION) 1078250079Scarl goto out; 1079250079Scarl 1080250079Scarl rc = ntb_read_local_spad(ntb, IF_NTB_NUM_QPS, &val); 1081250079Scarl if (rc != 0) 1082250079Scarl goto out; 1083250079Scarl 1084250079Scarl if (val != nt->max_qps) 1085250079Scarl goto out; 1086250079Scarl 1087289153Scem rc = ntb_read_local_spad(ntb, IF_NTB_NUM_MWS, &val); 1088250079Scarl if (rc != 0) 1089250079Scarl goto out; 1090250079Scarl 1091289208Scem if (val != num_mw) 1092250079Scarl goto out; 1093250079Scarl 1094289208Scem for (i = 0; i < num_mw; i++) { 1095289153Scem rc = ntb_read_local_spad(ntb, IF_NTB_MW0_SZ_HIGH + (i * 2), 1096289153Scem &val); 1097289153Scem if (rc != 0) 1098289153Scem goto free_mws; 1099250079Scarl 1100289153Scem val64 = (uint64_t)val << 32; 1101250079Scarl 1102289153Scem rc = ntb_read_local_spad(ntb, IF_NTB_MW0_SZ_LOW + (i * 2), 1103289153Scem &val); 1104289153Scem if (rc != 0) 1105289153Scem goto free_mws; 1106250079Scarl 1107289153Scem val64 |= val; 1108250079Scarl 1109289153Scem rc = ntb_set_mw(nt, i, val64); 1110289153Scem if (rc != 0) 1111289153Scem goto free_mws; 1112289153Scem } 1113289153Scem 1114250079Scarl nt->transport_link = NTB_LINK_UP; 1115255268Scarl if (bootverbose) 1116255268Scarl device_printf(ntb_get_device(ntb), "transport link up\n"); 1117250079Scarl 1118250079Scarl for (i = 0; i < nt->max_qps; i++) { 1119250079Scarl qp = &nt->qps[i]; 1120250079Scarl 1121250079Scarl ntb_transport_setup_qp_mw(nt, i); 1122250079Scarl 1123250079Scarl if (qp->client_ready == NTB_LINK_UP) 1124250079Scarl callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp); 1125250079Scarl } 1126250079Scarl 1127250079Scarl return; 1128250079Scarl 1129289153Scemfree_mws: 1130289153Scem for (i = 0; i < NTB_NUM_MW; i++) 1131289153Scem ntb_free_mw(nt, i); 1132250079Scarlout: 1133250079Scarl if (ntb_query_link_status(ntb)) 1134250079Scarl callout_reset(&nt->link_work, 1135289153Scem NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_transport_link_work, nt); 1136250079Scarl} 1137250079Scarl 1138250079Scarlstatic int 1139250079Scarlntb_set_mw(struct ntb_netdev *nt, int num_mw, unsigned int size) 1140250079Scarl{ 1141250079Scarl struct ntb_transport_mw *mw = &nt->mw[num_mw]; 1142250079Scarl 1143289154Scem /* No need to re-setup */ 1144289154Scem if (mw->size == size) 1145289154Scem return (0); 1146289154Scem 1147289154Scem if (mw->size != 0) 1148289154Scem ntb_free_mw(nt, num_mw); 1149289154Scem 1150250079Scarl /* Alloc memory for receiving data. Must be 4k aligned */ 1151250079Scarl mw->size = size; 1152250079Scarl 1153250079Scarl mw->virt_addr = contigmalloc(mw->size, M_NTB_IF, M_ZERO, 0, 1154250079Scarl BUS_SPACE_MAXADDR, mw->size, 0); 1155250079Scarl if (mw->virt_addr == NULL) { 1156289154Scem mw->size = 0; 1157250079Scarl printf("ntb: Unable to allocate MW buffer of size %d\n", 1158250079Scarl (int)mw->size); 1159250079Scarl return (ENOMEM); 1160250079Scarl } 1161250079Scarl /* TODO: replace with bus_space_* functions */ 1162250079Scarl mw->dma_addr = vtophys(mw->virt_addr); 1163250079Scarl 1164250079Scarl /* Notify HW the memory location of the receive buffer */ 1165250079Scarl ntb_set_mw_addr(nt->ntb, num_mw, mw->dma_addr); 1166250079Scarl 1167250079Scarl return (0); 1168250079Scarl} 1169250079Scarl 1170250079Scarlstatic void 1171289153Scemntb_free_mw(struct ntb_netdev *nt, int num_mw) 1172289153Scem{ 1173289153Scem struct ntb_transport_mw *mw = &nt->mw[num_mw]; 1174289153Scem 1175289153Scem if (mw->virt_addr == NULL) 1176289153Scem return; 1177289153Scem 1178289153Scem contigfree(mw->virt_addr, mw->size, M_NTB_IF); 1179289153Scem mw->virt_addr = NULL; 1180289153Scem} 1181289153Scem 1182289153Scemstatic void 1183250079Scarlntb_transport_setup_qp_mw(struct ntb_netdev *nt, unsigned int qp_num) 1184250079Scarl{ 1185250079Scarl struct ntb_transport_qp *qp = &nt->qps[qp_num]; 1186250079Scarl void *offset; 1187250079Scarl unsigned int rx_size, num_qps_mw; 1188250079Scarl uint8_t mw_num = QP_TO_MW(qp_num); 1189250079Scarl unsigned int i; 1190250079Scarl 1191250079Scarl if (nt->max_qps % NTB_NUM_MW && mw_num < nt->max_qps % NTB_NUM_MW) 1192250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW + 1; 1193250079Scarl else 1194250079Scarl num_qps_mw = nt->max_qps / NTB_NUM_MW; 1195250079Scarl 1196250079Scarl rx_size = (unsigned int) nt->mw[mw_num].size / num_qps_mw; 1197250079Scarl qp->remote_rx_info = (void *)((uint8_t *)nt->mw[mw_num].virt_addr + 1198250079Scarl (qp_num / NTB_NUM_MW * rx_size)); 1199250079Scarl rx_size -= sizeof(struct ntb_rx_info); 1200250079Scarl 1201289152Scem qp->rx_buff = qp->remote_rx_info + 1; 1202289156Scem /* Due to house-keeping, there must be at least 2 buffs */ 1203250079Scarl qp->rx_max_frame = min(transport_mtu + sizeof(struct ntb_payload_header), 1204289156Scem rx_size / 2); 1205250079Scarl qp->rx_max_entry = rx_size / qp->rx_max_frame; 1206250079Scarl qp->rx_index = 0; 1207250079Scarl 1208289156Scem qp->remote_rx_info->entry = qp->rx_max_entry - 1; 1209250079Scarl 1210250079Scarl /* setup the hdr offsets with 0's */ 1211250079Scarl for (i = 0; i < qp->rx_max_entry; i++) { 1212250079Scarl offset = (void *)((uint8_t *)qp->rx_buff + 1213250079Scarl qp->rx_max_frame * (i + 1) - 1214250079Scarl sizeof(struct ntb_payload_header)); 1215250079Scarl memset(offset, 0, sizeof(struct ntb_payload_header)); 1216250079Scarl } 1217250079Scarl 1218250079Scarl qp->rx_pkts = 0; 1219250079Scarl qp->tx_pkts = 0; 1220289155Scem qp->tx_index = 0; 1221250079Scarl} 1222250079Scarl 1223250079Scarlstatic void 1224250079Scarlntb_qp_link_work(void *arg) 1225250079Scarl{ 1226250079Scarl struct ntb_transport_qp *qp = arg; 1227250079Scarl struct ntb_softc *ntb = qp->ntb; 1228250079Scarl struct ntb_netdev *nt = qp->transport; 1229250079Scarl int rc, val; 1230250079Scarl 1231250079Scarl 1232250079Scarl rc = ntb_read_remote_spad(ntb, IF_NTB_QP_LINKS, &val); 1233250079Scarl if (rc != 0) 1234250079Scarl return; 1235250079Scarl 1236250079Scarl rc = ntb_write_remote_spad(ntb, IF_NTB_QP_LINKS, val | 1 << qp->qp_num); 1237250079Scarl 1238250079Scarl /* query remote spad for qp ready bits */ 1239250079Scarl rc = ntb_read_local_spad(ntb, IF_NTB_QP_LINKS, &val); 1240250079Scarl 1241250079Scarl /* See if the remote side is up */ 1242250079Scarl if ((1 << qp->qp_num & val) != 0) { 1243250079Scarl qp->qp_link = NTB_LINK_UP; 1244250079Scarl if (qp->event_handler != NULL) 1245250079Scarl qp->event_handler(qp->cb_data, NTB_LINK_UP); 1246255268Scarl if (bootverbose) 1247255268Scarl device_printf(ntb_get_device(ntb), "qp link up\n"); 1248250079Scarl } else if (nt->transport_link == NTB_LINK_UP) { 1249250079Scarl callout_reset(&qp->link_work, 1250250079Scarl NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1251250079Scarl } 1252250079Scarl} 1253250079Scarl 1254250079Scarl/* Link down event*/ 1255250079Scarlstatic void 1256250079Scarlntb_transport_link_cleanup(struct ntb_netdev *nt) 1257250079Scarl{ 1258250079Scarl int i; 1259250079Scarl 1260289273Scem /* Pass along the info to any clients */ 1261289273Scem for (i = 0; i < nt->max_qps; i++) 1262289273Scem if (!test_bit(i, &nt->qp_bitmap)) 1263289273Scem ntb_qp_link_down(&nt->qps[i]); 1264289273Scem 1265250079Scarl if (nt->transport_link == NTB_LINK_DOWN) 1266250079Scarl callout_drain(&nt->link_work); 1267250079Scarl else 1268250079Scarl nt->transport_link = NTB_LINK_DOWN; 1269250079Scarl 1270250079Scarl /* 1271250079Scarl * The scratchpad registers keep the values if the remote side 1272250079Scarl * goes down, blast them now to give them a sane value the next 1273250079Scarl * time they are accessed 1274250079Scarl */ 1275250079Scarl for (i = 0; i < IF_NTB_MAX_SPAD; i++) 1276250079Scarl ntb_write_local_spad(nt->ntb, i, 0); 1277250079Scarl} 1278250079Scarl 1279250079Scarl 1280250079Scarlstatic void 1281250079Scarlntb_qp_link_down(struct ntb_transport_qp *qp) 1282250079Scarl{ 1283250079Scarl 1284250079Scarl ntb_qp_link_cleanup(qp); 1285250079Scarl} 1286250079Scarl 1287250079Scarlstatic void 1288250079Scarlntb_qp_link_cleanup(struct ntb_transport_qp *qp) 1289250079Scarl{ 1290250079Scarl struct ntb_netdev *nt = qp->transport; 1291250079Scarl 1292250079Scarl if (qp->qp_link == NTB_LINK_DOWN) { 1293250079Scarl callout_drain(&qp->link_work); 1294250079Scarl return; 1295250079Scarl } 1296250079Scarl 1297250079Scarl if (qp->event_handler != NULL) 1298250079Scarl qp->event_handler(qp->cb_data, NTB_LINK_DOWN); 1299250079Scarl 1300250079Scarl qp->qp_link = NTB_LINK_DOWN; 1301250079Scarl 1302250079Scarl if (nt->transport_link == NTB_LINK_UP) 1303250079Scarl callout_reset(&qp->link_work, 1304250079Scarl NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp); 1305250079Scarl} 1306250079Scarl 1307250079Scarl/* Link commanded down */ 1308250079Scarl/** 1309250079Scarl * ntb_transport_link_down - Notify NTB transport to no longer enqueue data 1310250079Scarl * @qp: NTB transport layer queue to be disabled 1311250079Scarl * 1312250079Scarl * Notify NTB transport layer of client's desire to no longer receive data on 1313250079Scarl * transport queue specified. It is the client's responsibility to ensure all 1314289266Scem * entries on queue are purged or otherwise handled appropriately. 1315250079Scarl */ 1316250079Scarlstatic void 1317250079Scarlntb_transport_link_down(struct ntb_transport_qp *qp) 1318250079Scarl{ 1319250079Scarl int rc, val; 1320250079Scarl 1321250079Scarl if (qp == NULL) 1322250079Scarl return; 1323250079Scarl 1324250079Scarl qp->client_ready = NTB_LINK_DOWN; 1325250079Scarl 1326250079Scarl rc = ntb_read_remote_spad(qp->ntb, IF_NTB_QP_LINKS, &val); 1327250079Scarl if (rc != 0) 1328250079Scarl return; 1329250079Scarl 1330250079Scarl rc = ntb_write_remote_spad(qp->ntb, IF_NTB_QP_LINKS, 1331250079Scarl val & ~(1 << qp->qp_num)); 1332250079Scarl 1333250079Scarl if (qp->qp_link == NTB_LINK_UP) 1334250079Scarl ntb_send_link_down(qp); 1335250079Scarl else 1336250079Scarl callout_drain(&qp->link_work); 1337250079Scarl 1338250079Scarl} 1339250079Scarl 1340250079Scarlstatic void 1341250079Scarlntb_send_link_down(struct ntb_transport_qp *qp) 1342250079Scarl{ 1343250079Scarl struct ntb_queue_entry *entry; 1344250079Scarl int i, rc; 1345250079Scarl 1346250079Scarl if (qp->qp_link == NTB_LINK_DOWN) 1347250079Scarl return; 1348250079Scarl 1349250079Scarl qp->qp_link = NTB_LINK_DOWN; 1350250079Scarl 1351250079Scarl for (i = 0; i < NTB_LINK_DOWN_TIMEOUT; i++) { 1352250079Scarl entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q); 1353250079Scarl if (entry != NULL) 1354250079Scarl break; 1355250079Scarl pause("NTB Wait for link down", hz / 10); 1356250079Scarl } 1357250079Scarl 1358250079Scarl if (entry == NULL) 1359250079Scarl return; 1360250079Scarl 1361250079Scarl entry->cb_data = NULL; 1362250079Scarl entry->buf = NULL; 1363250079Scarl entry->len = 0; 1364250079Scarl entry->flags = IF_NTB_LINK_DOWN_FLAG; 1365250079Scarl 1366250079Scarl mtx_lock(&qp->transport->tx_lock); 1367250079Scarl rc = ntb_process_tx(qp, entry); 1368250079Scarl if (rc != 0) 1369250079Scarl printf("ntb: Failed to send link down\n"); 1370250079Scarl mtx_unlock(&qp->transport->tx_lock); 1371250079Scarl} 1372250079Scarl 1373250079Scarl 1374250079Scarl/* List Management */ 1375250079Scarl 1376250079Scarlstatic void 1377250079Scarlntb_list_add(struct mtx *lock, struct ntb_queue_entry *entry, 1378250079Scarl struct ntb_queue_list *list) 1379250079Scarl{ 1380250079Scarl 1381250079Scarl mtx_lock_spin(lock); 1382250079Scarl STAILQ_INSERT_TAIL(list, entry, entry); 1383250079Scarl mtx_unlock_spin(lock); 1384250079Scarl} 1385250079Scarl 1386250079Scarlstatic struct ntb_queue_entry * 1387250079Scarlntb_list_rm(struct mtx *lock, struct ntb_queue_list *list) 1388250079Scarl{ 1389250079Scarl struct ntb_queue_entry *entry; 1390250079Scarl 1391250079Scarl mtx_lock_spin(lock); 1392250079Scarl if (STAILQ_EMPTY(list)) { 1393250079Scarl entry = NULL; 1394250079Scarl goto out; 1395250079Scarl } 1396250079Scarl entry = STAILQ_FIRST(list); 1397250079Scarl STAILQ_REMOVE_HEAD(list, entry); 1398250079Scarlout: 1399250079Scarl mtx_unlock_spin(lock); 1400250079Scarl 1401250079Scarl return (entry); 1402250079Scarl} 1403250079Scarl 1404250079Scarl/* Helper functions */ 1405250079Scarl/* TODO: This too should really be part of the kernel */ 1406250079Scarl#define EUI48_MULTICAST 1 << 0 1407250079Scarl#define EUI48_LOCALLY_ADMINISTERED 1 << 1 1408250079Scarlstatic void 1409250079Scarlcreate_random_local_eui48(u_char *eaddr) 1410250079Scarl{ 1411250079Scarl static uint8_t counter = 0; 1412250079Scarl uint32_t seed = ticks; 1413250079Scarl 1414250079Scarl eaddr[0] = EUI48_LOCALLY_ADMINISTERED; 1415250079Scarl memcpy(&eaddr[1], &seed, sizeof(uint32_t)); 1416250079Scarl eaddr[5] = counter++; 1417250079Scarl} 1418250079Scarl 1419250079Scarl/** 1420250079Scarl * ntb_transport_max_size - Query the max payload size of a qp 1421250079Scarl * @qp: NTB transport layer queue to be queried 1422250079Scarl * 1423250079Scarl * Query the maximum payload size permissible on the given qp 1424250079Scarl * 1425250079Scarl * RETURNS: the max payload size of a qp 1426250079Scarl */ 1427250079Scarlstatic unsigned int 1428250079Scarlntb_transport_max_size(struct ntb_transport_qp *qp) 1429250079Scarl{ 1430250079Scarl 1431250079Scarl if (qp == NULL) 1432250079Scarl return (0); 1433250079Scarl 1434250079Scarl return (qp->tx_max_frame - sizeof(struct ntb_payload_header)); 1435250079Scarl} 1436