1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright(c) 2007 Intel Corporation. All rights reserved.
   4 *
   5 * Maintained at www.Open-FCoE.org
   6 */
   7
   8/*
   9 * PORT LOCKING NOTES
  10 *
  11 * These comments only apply to the 'port code' which consists of the lport,
  12 * disc and rport blocks.
  13 *
  14 * MOTIVATION
  15 *
  16 * The lport, disc and rport blocks all have mutexes that are used to protect
  17 * those objects. The main motivation for these locks is to prevent from
  18 * having an lport reset just before we send a frame. In that scenario the
  19 * lport's FID would get set to zero and then we'd send a frame with an
  20 * invalid SID. We also need to ensure that states don't change unexpectedly
  21 * while processing another state.
  22 *
  23 * HIERARCHY
  24 *
  25 * The following hierarchy defines the locking rules. A greater lock
  26 * may be held before acquiring a lesser lock, but a lesser lock should never
  27 * be held while attempting to acquire a greater lock. Here is the hierarchy-
  28 *
  29 * lport > disc, lport > rport, disc > rport
  30 *
  31 * CALLBACKS
  32 *
  33 * The callbacks cause complications with this scheme. There is a callback
  34 * from the rport (to either lport or disc) and a callback from disc
  35 * (to the lport).
  36 *
  37 * As rports exit the rport state machine a callback is made to the owner of
  38 * the rport to notify success or failure. Since the callback is likely to
  39 * cause the lport or disc to grab its lock we cannot hold the rport lock
  40 * while making the callback. To ensure that the rport is not free'd while
  41 * processing the callback the rport callbacks are serialized through a
  42 * single-threaded workqueue. An rport would never be free'd while in a
  43 * callback handler because no other rport work in this queue can be executed
  44 * at the same time.
  45 *
  46 * When discovery succeeds or fails a callback is made to the lport as
  47 * notification. Currently, successful discovery causes the lport to take no
  48 * action. A failure will cause the lport to reset. There is likely a circular
  49 * locking problem with this implementation.
  50 */
  51
  52/*
  53 * LPORT LOCKING
  54 *
  55 * The critical sections protected by the lport's mutex are quite broad and
  56 * may be improved upon in the future. The lport code and its locking doesn't
  57 * influence the I/O path, so excessive locking doesn't penalize I/O
  58 * performance.
  59 *
  60 * The strategy is to lock whenever processing a request or response. Note
  61 * that every _enter_* function corresponds to a state change. They generally
  62 * change the lports state and then send a request out on the wire. We lock
  63 * before calling any of these functions to protect that state change. This
  64 * means that the entry points into the lport block manage the locks while
  65 * the state machine can transition between states (i.e. _enter_* functions)
  66 * while always staying protected.
  67 *
  68 * When handling responses we also hold the lport mutex broadly. When the
  69 * lport receives the response frame it locks the mutex and then calls the
  70 * appropriate handler for the particuar response. Generally a response will
  71 * trigger a state change and so the lock must already be held.
  72 *
  73 * Retries also have to consider the locking. The retries occur from a work
  74 * context and the work function will lock the lport and then retry the state
  75 * (i.e. _enter_* function).
  76 */
  77
  78#include <linux/timer.h>
  79#include <linux/delay.h>
  80#include <linux/module.h>
  81#include <linux/slab.h>
  82#include <asm/unaligned.h>
  83
  84#include <scsi/fc/fc_gs.h>
  85
  86#include <scsi/libfc.h>
  87#include <linux/scatterlist.h>
  88
  89#include "fc_encode.h"
  90#include "fc_libfc.h"
  91
  92/* Fabric IDs to use for point-to-point mode, chosen on whims. */
  93#define FC_LOCAL_PTP_FID_LO   0x010101
  94#define FC_LOCAL_PTP_FID_HI   0x010102
  95
  96#define	DNS_DELAY		3 /* Discovery delay after RSCN (in seconds)*/
  97#define	MAX_CT_PAYLOAD		2048
  98#define	DISCOVERED_PORTS	4
  99#define	NUMBER_OF_PORTS		1
 100
 101static void fc_lport_error(struct fc_lport *, struct fc_frame *);
 102
 103static void fc_lport_enter_reset(struct fc_lport *);
 104static void fc_lport_enter_flogi(struct fc_lport *);
 105static void fc_lport_enter_dns(struct fc_lport *);
 106static void fc_lport_enter_ns(struct fc_lport *, enum fc_lport_state);
 107static void fc_lport_enter_scr(struct fc_lport *);
 108static void fc_lport_enter_ready(struct fc_lport *);
 109static void fc_lport_enter_logo(struct fc_lport *);
 110static void fc_lport_enter_fdmi(struct fc_lport *lport);
 111static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state);
 112
 113static const char *fc_lport_state_names[] = {
 114	[LPORT_ST_DISABLED] = "disabled",
 115	[LPORT_ST_FLOGI] =    "FLOGI",
 116	[LPORT_ST_DNS] =      "dNS",
 117	[LPORT_ST_RNN_ID] =   "RNN_ID",
 118	[LPORT_ST_RSNN_NN] =  "RSNN_NN",
 119	[LPORT_ST_RSPN_ID] =  "RSPN_ID",
 120	[LPORT_ST_RFT_ID] =   "RFT_ID",
 121	[LPORT_ST_RFF_ID] =   "RFF_ID",
 122	[LPORT_ST_FDMI] =     "FDMI",
 123	[LPORT_ST_RHBA] =     "RHBA",
 124	[LPORT_ST_RPA] =      "RPA",
 125	[LPORT_ST_DHBA] =     "DHBA",
 126	[LPORT_ST_DPRT] =     "DPRT",
 127	[LPORT_ST_SCR] =      "SCR",
 128	[LPORT_ST_READY] =    "Ready",
 129	[LPORT_ST_LOGO] =     "LOGO",
 130	[LPORT_ST_RESET] =    "reset",
 131};
 132
 133/**
 134 * struct fc_bsg_info - FC Passthrough managemet structure
 135 * @job:      The passthrough job
 136 * @lport:    The local port to pass through a command
 137 * @rsp_code: The expected response code
 138 * @sg:	      job->reply_payload.sg_list
 139 * @nents:    job->reply_payload.sg_cnt
 140 * @offset:   The offset into the response data
 141 */
 142struct fc_bsg_info {
 143	struct bsg_job *job;
 144	struct fc_lport *lport;
 145	u16 rsp_code;
 146	struct scatterlist *sg;
 147	u32 nents;
 148	size_t offset;
 149};
 150
 151/**
 152 * fc_frame_drop() - Dummy frame handler
 153 * @lport: The local port the frame was received on
 154 * @fp:	   The received frame
 155 */
 156static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
 157{
 158	fc_frame_free(fp);
 159	return 0;
 160}
 161
 162/**
 163 * fc_lport_rport_callback() - Event handler for rport events
 164 * @lport: The lport which is receiving the event
 165 * @rdata: private remote port data
 166 * @event: The event that occurred
 167 *
 168 * Locking Note: The rport lock should not be held when calling
 169 *		 this function.
 170 */
 171static void fc_lport_rport_callback(struct fc_lport *lport,
 172				    struct fc_rport_priv *rdata,
 173				    enum fc_rport_event event)
 174{
 175	FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event,
 176		     rdata->ids.port_id);
 177
 178	mutex_lock(&lport->lp_mutex);
 179	switch (event) {
 180	case RPORT_EV_READY:
 181		if (lport->state == LPORT_ST_DNS) {
 182			lport->dns_rdata = rdata;
 183			fc_lport_enter_ns(lport, LPORT_ST_RNN_ID);
 184		} else if (lport->state == LPORT_ST_FDMI) {
 185			lport->ms_rdata = rdata;
 186			fc_lport_enter_ms(lport, LPORT_ST_DHBA);
 187		} else {
 188			FC_LPORT_DBG(lport, "Received an READY event "
 189				     "on port (%6.6x) for the directory "
 190				     "server, but the lport is not "
 191				     "in the DNS or FDMI state, it's in the "
 192				     "%d state", rdata->ids.port_id,
 193				     lport->state);
 194			fc_rport_logoff(rdata);
 195		}
 196		break;
 197	case RPORT_EV_LOGO:
 198	case RPORT_EV_FAILED:
 199	case RPORT_EV_STOP:
 200		if (rdata->ids.port_id == FC_FID_DIR_SERV)
 201			lport->dns_rdata = NULL;
 202		else if (rdata->ids.port_id == FC_FID_MGMT_SERV)
 203			lport->ms_rdata = NULL;
 204		break;
 205	case RPORT_EV_NONE:
 206		break;
 207	}
 208	mutex_unlock(&lport->lp_mutex);
 209}
 210
 211/**
 212 * fc_lport_state() - Return a string which represents the lport's state
 213 * @lport: The lport whose state is to converted to a string
 214 */
 215static const char *fc_lport_state(struct fc_lport *lport)
 216{
 217	const char *cp;
 218
 219	cp = fc_lport_state_names[lport->state];
 220	if (!cp)
 221		cp = "unknown";
 222	return cp;
 223}
 224
 225/**
 226 * fc_lport_ptp_setup() - Create an rport for point-to-point mode
 227 * @lport:	 The lport to attach the ptp rport to
 228 * @remote_fid:	 The FID of the ptp rport
 229 * @remote_wwpn: The WWPN of the ptp rport
 230 * @remote_wwnn: The WWNN of the ptp rport
 231 */
 232static void fc_lport_ptp_setup(struct fc_lport *lport,
 233			       u32 remote_fid, u64 remote_wwpn,
 234			       u64 remote_wwnn)
 235{
 236	lockdep_assert_held(&lport->lp_mutex);
 237
 238	if (lport->ptp_rdata) {
 239		fc_rport_logoff(lport->ptp_rdata);
 240		kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
 241	}
 242	mutex_lock(&lport->disc.disc_mutex);
 243	lport->ptp_rdata = fc_rport_create(lport, remote_fid);
 244	if (!lport->ptp_rdata) {
 245		printk(KERN_WARNING "libfc: Failed to setup lport 0x%x\n",
 246			lport->port_id);
 247		mutex_unlock(&lport->disc.disc_mutex);
 248		return;
 249	}
 250	kref_get(&lport->ptp_rdata->kref);
 251	lport->ptp_rdata->ids.port_name = remote_wwpn;
 252	lport->ptp_rdata->ids.node_name = remote_wwnn;
 253	mutex_unlock(&lport->disc.disc_mutex);
 254
 255	fc_rport_login(lport->ptp_rdata);
 256
 257	fc_lport_enter_ready(lport);
 258}
 259
 260/**
 261 * fc_get_host_port_state() - Return the port state of the given Scsi_Host
 262 * @shost:  The SCSI host whose port state is to be determined
 263 */
 264void fc_get_host_port_state(struct Scsi_Host *shost)
 265{
 266	struct fc_lport *lport = shost_priv(shost);
 267
 268	mutex_lock(&lport->lp_mutex);
 269	if (!lport->link_up)
 270		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 271	else
 272		switch (lport->state) {
 273		case LPORT_ST_READY:
 274			fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 275			break;
 276		default:
 277			fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
 278		}
 279	mutex_unlock(&lport->lp_mutex);
 280}
 281EXPORT_SYMBOL(fc_get_host_port_state);
 282
 283/**
 284 * fc_get_host_speed() - Return the speed of the given Scsi_Host
 285 * @shost: The SCSI host whose port speed is to be determined
 286 */
 287void fc_get_host_speed(struct Scsi_Host *shost)
 288{
 289	struct fc_lport *lport = shost_priv(shost);
 290
 291	fc_host_speed(shost) = lport->link_speed;
 292}
 293EXPORT_SYMBOL(fc_get_host_speed);
 294
 295/**
 296 * fc_get_host_stats() - Return the Scsi_Host's statistics
 297 * @shost: The SCSI host whose statistics are to be returned
 298 */
 299struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
 300{
 301	struct fc_host_statistics *fc_stats;
 302	struct fc_lport *lport = shost_priv(shost);
 303	unsigned int cpu;
 304	u64 fcp_in_bytes = 0;
 305	u64 fcp_out_bytes = 0;
 306
 307	fc_stats = &lport->host_stats;
 308	memset(fc_stats, 0, sizeof(struct fc_host_statistics));
 309
 310	fc_stats->seconds_since_last_reset = (jiffies - lport->boot_time) / HZ;
 311
 312	for_each_possible_cpu(cpu) {
 313		struct fc_stats *stats;
 314
 315		stats = per_cpu_ptr(lport->stats, cpu);
 316
 317		fc_stats->tx_frames += READ_ONCE(stats->TxFrames);
 318		fc_stats->tx_words += READ_ONCE(stats->TxWords);
 319		fc_stats->rx_frames += READ_ONCE(stats->RxFrames);
 320		fc_stats->rx_words += READ_ONCE(stats->RxWords);
 321		fc_stats->error_frames += READ_ONCE(stats->ErrorFrames);
 322		fc_stats->invalid_crc_count += READ_ONCE(stats->InvalidCRCCount);
 323		fc_stats->fcp_input_requests += READ_ONCE(stats->InputRequests);
 324		fc_stats->fcp_output_requests += READ_ONCE(stats->OutputRequests);
 325		fc_stats->fcp_control_requests += READ_ONCE(stats->ControlRequests);
 326		fcp_in_bytes += READ_ONCE(stats->InputBytes);
 327		fcp_out_bytes += READ_ONCE(stats->OutputBytes);
 328		fc_stats->fcp_packet_alloc_failures += READ_ONCE(stats->FcpPktAllocFails);
 329		fc_stats->fcp_packet_aborts += READ_ONCE(stats->FcpPktAborts);
 330		fc_stats->fcp_frame_alloc_failures += READ_ONCE(stats->FcpFrameAllocFails);
 331		fc_stats->link_failure_count += READ_ONCE(stats->LinkFailureCount);
 332	}
 333	fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
 334	fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
 335	fc_stats->lip_count = -1;
 336	fc_stats->nos_count = -1;
 337	fc_stats->loss_of_sync_count = -1;
 338	fc_stats->loss_of_signal_count = -1;
 339	fc_stats->prim_seq_protocol_err_count = -1;
 340	fc_stats->dumped_frames = -1;
 341
 342	/* update exches stats */
 343	fc_exch_update_stats(lport);
 344
 345	return fc_stats;
 346}
 347EXPORT_SYMBOL(fc_get_host_stats);
 348
 349/**
 350 * fc_lport_flogi_fill() - Fill in FLOGI command for request
 351 * @lport: The local port the FLOGI is for
 352 * @flogi: The FLOGI command
 353 * @op:	   The opcode
 354 */
 355static void fc_lport_flogi_fill(struct fc_lport *lport,
 356				struct fc_els_flogi *flogi,
 357				unsigned int op)
 358{
 359	struct fc_els_csp *sp;
 360	struct fc_els_cssp *cp;
 361
 362	memset(flogi, 0, sizeof(*flogi));
 363	flogi->fl_cmd = (u8) op;
 364	put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
 365	put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
 366	sp = &flogi->fl_csp;
 367	sp->sp_hi_ver = 0x20;
 368	sp->sp_lo_ver = 0x20;
 369	sp->sp_bb_cred = htons(10);	/* this gets set by gateway */
 370	sp->sp_bb_data = htons((u16) lport->mfs);
 371	cp = &flogi->fl_cssp[3 - 1];	/* class 3 parameters */
 372	cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
 373	if (op != ELS_FLOGI) {
 374		sp->sp_features = htons(FC_SP_FT_CIRO);
 375		sp->sp_tot_seq = htons(255);	/* seq. we accept */
 376		sp->sp_rel_off = htons(0x1f);
 377		sp->sp_e_d_tov = htonl(lport->e_d_tov);
 378
 379		cp->cp_rdfs = htons((u16) lport->mfs);
 380		cp->cp_con_seq = htons(255);
 381		cp->cp_open_seq = 1;
 382	}
 383}
 384
 385/**
 386 * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port
 387 * @lport: The local port to add a new FC-4 type to
 388 * @type:  The new FC-4 type
 389 */
 390static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
 391{
 392	__be32 *mp;
 393
 394	mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
 395	*mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
 396}
 397
 398/**
 399 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
 400 * @lport: Fibre Channel local port receiving the RLIR
 401 * @fp:	   The RLIR request frame
 402 */
 403static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
 404{
 405	lockdep_assert_held(&lport->lp_mutex);
 406
 407	FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
 408		     fc_lport_state(lport));
 409
 410	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
 411	fc_frame_free(fp);
 412}
 413
 414/**
 415 * fc_lport_recv_echo_req() - Handle received ECHO request
 416 * @lport: The local port receiving the ECHO
 417 * @in_fp: ECHO request frame
 418 */
 419static void fc_lport_recv_echo_req(struct fc_lport *lport,
 420				   struct fc_frame *in_fp)
 421{
 422	struct fc_frame *fp;
 423	unsigned int len;
 424	void *pp;
 425	void *dp;
 426
 427	lockdep_assert_held(&lport->lp_mutex);
 428
 429	FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
 430		     fc_lport_state(lport));
 431
 432	len = fr_len(in_fp) - sizeof(struct fc_frame_header);
 433	pp = fc_frame_payload_get(in_fp, len);
 434
 435	if (len < sizeof(__be32))
 436		len = sizeof(__be32);
 437
 438	fp = fc_frame_alloc(lport, len);
 439	if (fp) {
 440		dp = fc_frame_payload_get(fp, len);
 441		memcpy(dp, pp, len);
 442		*((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
 443		fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
 444		lport->tt.frame_send(lport, fp);
 445	}
 446	fc_frame_free(in_fp);
 447}
 448
 449/**
 450 * fc_lport_recv_rnid_req() - Handle received Request Node ID data request
 451 * @lport: The local port receiving the RNID
 452 * @in_fp: The RNID request frame
 453 */
 454static void fc_lport_recv_rnid_req(struct fc_lport *lport,
 455				   struct fc_frame *in_fp)
 456{
 457	struct fc_frame *fp;
 458	struct fc_els_rnid *req;
 459	struct {
 460		struct fc_els_rnid_resp rnid;
 461		struct fc_els_rnid_cid cid;
 462		struct fc_els_rnid_gen gen;
 463	} *rp;
 464	struct fc_seq_els_data rjt_data;
 465	u8 fmt;
 466	size_t len;
 467
 468	lockdep_assert_held(&lport->lp_mutex);
 469
 470	FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
 471		     fc_lport_state(lport));
 472
 473	req = fc_frame_payload_get(in_fp, sizeof(*req));
 474	if (!req) {
 475		rjt_data.reason = ELS_RJT_LOGIC;
 476		rjt_data.explan = ELS_EXPL_NONE;
 477		fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
 478	} else {
 479		fmt = req->rnid_fmt;
 480		len = sizeof(*rp);
 481		if (fmt != ELS_RNIDF_GEN ||
 482		    ntohl(lport->rnid_gen.rnid_atype) == 0) {
 483			fmt = ELS_RNIDF_NONE;	/* nothing to provide */
 484			len -= sizeof(rp->gen);
 485		}
 486		fp = fc_frame_alloc(lport, len);
 487		if (fp) {
 488			rp = fc_frame_payload_get(fp, len);
 489			memset(rp, 0, len);
 490			rp->rnid.rnid_cmd = ELS_LS_ACC;
 491			rp->rnid.rnid_fmt = fmt;
 492			rp->rnid.rnid_cid_len = sizeof(rp->cid);
 493			rp->cid.rnid_wwpn = htonll(lport->wwpn);
 494			rp->cid.rnid_wwnn = htonll(lport->wwnn);
 495			if (fmt == ELS_RNIDF_GEN) {
 496				rp->rnid.rnid_sid_len = sizeof(rp->gen);
 497				memcpy(&rp->gen, &lport->rnid_gen,
 498				       sizeof(rp->gen));
 499			}
 500			fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
 501			lport->tt.frame_send(lport, fp);
 502		}
 503	}
 504	fc_frame_free(in_fp);
 505}
 506
 507/**
 508 * fc_lport_recv_logo_req() - Handle received fabric LOGO request
 509 * @lport: The local port receiving the LOGO
 510 * @fp:	   The LOGO request frame
 511 */
 512static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
 513{
 514	lockdep_assert_held(&lport->lp_mutex);
 515
 516	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
 517	fc_lport_enter_reset(lport);
 518	fc_frame_free(fp);
 519}
 520
 521/**
 522 * fc_fabric_login() - Start the lport state machine
 523 * @lport: The local port that should log into the fabric
 524 *
 525 * Locking Note: This function should not be called
 526 *		 with the lport lock held.
 527 */
 528int fc_fabric_login(struct fc_lport *lport)
 529{
 530	int rc = -1;
 531
 532	mutex_lock(&lport->lp_mutex);
 533	if (lport->state == LPORT_ST_DISABLED ||
 534	    lport->state == LPORT_ST_LOGO) {
 535		fc_lport_state_enter(lport, LPORT_ST_RESET);
 536		fc_lport_enter_reset(lport);
 537		rc = 0;
 538	}
 539	mutex_unlock(&lport->lp_mutex);
 540
 541	return rc;
 542}
 543EXPORT_SYMBOL(fc_fabric_login);
 544
 545/**
 546 * __fc_linkup() - Handler for transport linkup events
 547 * @lport: The lport whose link is up
 548 */
 549void __fc_linkup(struct fc_lport *lport)
 550{
 551	lockdep_assert_held(&lport->lp_mutex);
 552
 553	if (!lport->link_up) {
 554		lport->link_up = 1;
 555
 556		if (lport->state == LPORT_ST_RESET)
 557			fc_lport_enter_flogi(lport);
 558	}
 559}
 560
 561/**
 562 * fc_linkup() - Handler for transport linkup events
 563 * @lport: The local port whose link is up
 564 */
 565void fc_linkup(struct fc_lport *lport)
 566{
 567	printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
 568	       lport->host->host_no, lport->port_id);
 569
 570	mutex_lock(&lport->lp_mutex);
 571	__fc_linkup(lport);
 572	mutex_unlock(&lport->lp_mutex);
 573}
 574EXPORT_SYMBOL(fc_linkup);
 575
 576/**
 577 * __fc_linkdown() - Handler for transport linkdown events
 578 * @lport: The lport whose link is down
 579 */
 580void __fc_linkdown(struct fc_lport *lport)
 581{
 582	lockdep_assert_held(&lport->lp_mutex);
 583
 584	if (lport->link_up) {
 585		lport->link_up = 0;
 586		fc_lport_enter_reset(lport);
 587		lport->tt.fcp_cleanup(lport);
 588	}
 589}
 590
 591/**
 592 * fc_linkdown() - Handler for transport linkdown events
 593 * @lport: The local port whose link is down
 594 */
 595void fc_linkdown(struct fc_lport *lport)
 596{
 597	printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
 598	       lport->host->host_no, lport->port_id);
 599
 600	mutex_lock(&lport->lp_mutex);
 601	__fc_linkdown(lport);
 602	mutex_unlock(&lport->lp_mutex);
 603}
 604EXPORT_SYMBOL(fc_linkdown);
 605
 606/**
 607 * fc_fabric_logoff() - Logout of the fabric
 608 * @lport: The local port to logoff the fabric
 609 *
 610 * Return value:
 611 *	0 for success, -1 for failure
 612 */
 613int fc_fabric_logoff(struct fc_lport *lport)
 614{
 615	lport->tt.disc_stop_final(lport);
 616	mutex_lock(&lport->lp_mutex);
 617	if (lport->dns_rdata)
 618		fc_rport_logoff(lport->dns_rdata);
 619	mutex_unlock(&lport->lp_mutex);
 620	fc_rport_flush_queue();
 621	mutex_lock(&lport->lp_mutex);
 622	fc_lport_enter_logo(lport);
 623	mutex_unlock(&lport->lp_mutex);
 624	cancel_delayed_work_sync(&lport->retry_work);
 625	return 0;
 626}
 627EXPORT_SYMBOL(fc_fabric_logoff);
 628
 629/**
 630 * fc_lport_destroy() - Unregister a fc_lport
 631 * @lport: The local port to unregister
 632 *
 633 * Note:
 634 * exit routine for fc_lport instance
 635 * clean-up all the allocated memory
 636 * and free up other system resources.
 637 *
 638 */
 639int fc_lport_destroy(struct fc_lport *lport)
 640{
 641	mutex_lock(&lport->lp_mutex);
 642	lport->state = LPORT_ST_DISABLED;
 643	lport->link_up = 0;
 644	lport->tt.frame_send = fc_frame_drop;
 645	mutex_unlock(&lport->lp_mutex);
 646
 647	lport->tt.fcp_abort_io(lport);
 648	lport->tt.disc_stop_final(lport);
 649	lport->tt.exch_mgr_reset(lport, 0, 0);
 650	cancel_delayed_work_sync(&lport->retry_work);
 651	fc_fc4_del_lport(lport);
 652	return 0;
 653}
 654EXPORT_SYMBOL(fc_lport_destroy);
 655
 656/**
 657 * fc_set_mfs() - Set the maximum frame size for a local port
 658 * @lport: The local port to set the MFS for
 659 * @mfs:   The new MFS
 660 */
 661int fc_set_mfs(struct fc_lport *lport, u32 mfs)
 662{
 663	unsigned int old_mfs;
 664	int rc = -EINVAL;
 665
 666	mutex_lock(&lport->lp_mutex);
 667
 668	old_mfs = lport->mfs;
 669
 670	if (mfs >= FC_MIN_MAX_FRAME) {
 671		mfs &= ~3;
 672		if (mfs > FC_MAX_FRAME)
 673			mfs = FC_MAX_FRAME;
 674		mfs -= sizeof(struct fc_frame_header);
 675		lport->mfs = mfs;
 676		rc = 0;
 677	}
 678
 679	if (!rc && mfs < old_mfs)
 680		fc_lport_enter_reset(lport);
 681
 682	mutex_unlock(&lport->lp_mutex);
 683
 684	return rc;
 685}
 686EXPORT_SYMBOL(fc_set_mfs);
 687
 688/**
 689 * fc_lport_disc_callback() - Callback for discovery events
 690 * @lport: The local port receiving the event
 691 * @event: The discovery event
 692 */
 693static void fc_lport_disc_callback(struct fc_lport *lport,
 694				   enum fc_disc_event event)
 695{
 696	switch (event) {
 697	case DISC_EV_SUCCESS:
 698		FC_LPORT_DBG(lport, "Discovery succeeded\n");
 699		break;
 700	case DISC_EV_FAILED:
 701		printk(KERN_ERR "host%d: libfc: "
 702		       "Discovery failed for port (%6.6x)\n",
 703		       lport->host->host_no, lport->port_id);
 704		mutex_lock(&lport->lp_mutex);
 705		fc_lport_enter_reset(lport);
 706		mutex_unlock(&lport->lp_mutex);
 707		break;
 708	case DISC_EV_NONE:
 709		WARN_ON(1);
 710		break;
 711	}
 712}
 713
 714/**
 715 * fc_lport_enter_ready() - Enter the ready state and start discovery
 716 * @lport: The local port that is ready
 717 */
 718static void fc_lport_enter_ready(struct fc_lport *lport)
 719{
 720	lockdep_assert_held(&lport->lp_mutex);
 721
 722	FC_LPORT_DBG(lport, "Entered READY from state %s\n",
 723		     fc_lport_state(lport));
 724
 725	fc_lport_state_enter(lport, LPORT_ST_READY);
 726	if (lport->vport)
 727		fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
 728	fc_vports_linkchange(lport);
 729
 730	if (!lport->ptp_rdata)
 731		lport->tt.disc_start(fc_lport_disc_callback, lport);
 732}
 733
 734/**
 735 * fc_lport_set_port_id() - set the local port Port ID
 736 * @lport: The local port which will have its Port ID set.
 737 * @port_id: The new port ID.
 738 * @fp: The frame containing the incoming request, or NULL.
 739 */
 740static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
 741				 struct fc_frame *fp)
 742{
 743	lockdep_assert_held(&lport->lp_mutex);
 744
 745	if (port_id)
 746		printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
 747		       lport->host->host_no, port_id);
 748
 749	lport->port_id = port_id;
 750
 751	/* Update the fc_host */
 752	fc_host_port_id(lport->host) = port_id;
 753
 754	if (lport->tt.lport_set_port_id)
 755		lport->tt.lport_set_port_id(lport, port_id, fp);
 756}
 757
 758/**
 759 * fc_lport_set_local_id() - set the local port Port ID for point-to-multipoint
 760 * @lport: The local port which will have its Port ID set.
 761 * @port_id: The new port ID.
 762 *
 763 * Called by the lower-level driver when transport sets the local port_id.
 764 * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
 765 * discovery to be skipped.
 766 */
 767void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
 768{
 769	mutex_lock(&lport->lp_mutex);
 770
 771	fc_lport_set_port_id(lport, port_id, NULL);
 772
 773	switch (lport->state) {
 774	case LPORT_ST_RESET:
 775	case LPORT_ST_FLOGI:
 776		if (port_id)
 777			fc_lport_enter_ready(lport);
 778		break;
 779	default:
 780		break;
 781	}
 782	mutex_unlock(&lport->lp_mutex);
 783}
 784EXPORT_SYMBOL(fc_lport_set_local_id);
 785
 786/**
 787 * fc_lport_recv_flogi_req() - Receive a FLOGI request
 788 * @lport: The local port that received the request
 789 * @rx_fp: The FLOGI frame
 790 *
 791 * A received FLOGI request indicates a point-to-point connection.
 792 * Accept it with the common service parameters indicating our N port.
 793 * Set up to do a PLOGI if we have the higher-number WWPN.
 794 */
 795static void fc_lport_recv_flogi_req(struct fc_lport *lport,
 796				    struct fc_frame *rx_fp)
 797{
 798	struct fc_frame *fp;
 799	struct fc_frame_header *fh;
 800	struct fc_els_flogi *flp;
 801	struct fc_els_flogi *new_flp;
 802	u64 remote_wwpn;
 803	u32 remote_fid;
 804	u32 local_fid;
 805
 806	lockdep_assert_held(&lport->lp_mutex);
 807
 808	FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
 809		     fc_lport_state(lport));
 810
 811	remote_fid = fc_frame_sid(rx_fp);
 812	flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
 813	if (!flp)
 814		goto out;
 815	remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
 816	if (remote_wwpn == lport->wwpn) {
 817		printk(KERN_WARNING "host%d: libfc: Received FLOGI from port "
 818		       "with same WWPN %16.16llx\n",
 819		       lport->host->host_no, remote_wwpn);
 820		goto out;
 821	}
 822	FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn);
 823
 824	/*
 825	 * XXX what is the right thing to do for FIDs?
 826	 * The originator might expect our S_ID to be 0xfffffe.
 827	 * But if so, both of us could end up with the same FID.
 828	 */
 829	local_fid = FC_LOCAL_PTP_FID_LO;
 830	if (remote_wwpn < lport->wwpn) {
 831		local_fid = FC_LOCAL_PTP_FID_HI;
 832		if (!remote_fid || remote_fid == local_fid)
 833			remote_fid = FC_LOCAL_PTP_FID_LO;
 834	} else if (!remote_fid) {
 835		remote_fid = FC_LOCAL_PTP_FID_HI;
 836	}
 837
 838	fc_lport_set_port_id(lport, local_fid, rx_fp);
 839
 840	fp = fc_frame_alloc(lport, sizeof(*flp));
 841	if (fp) {
 842		new_flp = fc_frame_payload_get(fp, sizeof(*flp));
 843		fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
 844		new_flp->fl_cmd = (u8) ELS_LS_ACC;
 845
 846		/*
 847		 * Send the response.  If this fails, the originator should
 848		 * repeat the sequence.
 849		 */
 850		fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0);
 851		fh = fc_frame_header_get(fp);
 852		hton24(fh->fh_s_id, local_fid);
 853		hton24(fh->fh_d_id, remote_fid);
 854		lport->tt.frame_send(lport, fp);
 855
 856	} else {
 857		fc_lport_error(lport, fp);
 858	}
 859	fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
 860			   get_unaligned_be64(&flp->fl_wwnn));
 861out:
 862	fc_frame_free(rx_fp);
 863}
 864
 865/**
 866 * fc_lport_recv_els_req() - The generic lport ELS request handler
 867 * @lport: The local port that received the request
 868 * @fp:	   The request frame
 869 *
 870 * This function will see if the lport handles the request or
 871 * if an rport should handle the request.
 872 *
 873 * Locking Note: This function should not be called with the lport
 874 *		 lock held because it will grab the lock.
 875 */
 876static void fc_lport_recv_els_req(struct fc_lport *lport,
 877				  struct fc_frame *fp)
 878{
 879	mutex_lock(&lport->lp_mutex);
 880
 881	/*
 882	 * Handle special ELS cases like FLOGI, LOGO, and
 883	 * RSCN here.  These don't require a session.
 884	 * Even if we had a session, it might not be ready.
 885	 */
 886	if (!lport->link_up)
 887		fc_frame_free(fp);
 888	else {
 889		/*
 890		 * Check opcode.
 891		 */
 892		switch (fc_frame_payload_op(fp)) {
 893		case ELS_FLOGI:
 894			if (!lport->point_to_multipoint)
 895				fc_lport_recv_flogi_req(lport, fp);
 896			else
 897				fc_rport_recv_req(lport, fp);
 898			break;
 899		case ELS_LOGO:
 900			if (fc_frame_sid(fp) == FC_FID_FLOGI)
 901				fc_lport_recv_logo_req(lport, fp);
 902			else
 903				fc_rport_recv_req(lport, fp);
 904			break;
 905		case ELS_RSCN:
 906			lport->tt.disc_recv_req(lport, fp);
 907			break;
 908		case ELS_ECHO:
 909			fc_lport_recv_echo_req(lport, fp);
 910			break;
 911		case ELS_RLIR:
 912			fc_lport_recv_rlir_req(lport, fp);
 913			break;
 914		case ELS_RNID:
 915			fc_lport_recv_rnid_req(lport, fp);
 916			break;
 917		default:
 918			fc_rport_recv_req(lport, fp);
 919			break;
 920		}
 921	}
 922	mutex_unlock(&lport->lp_mutex);
 923}
 924
 925static int fc_lport_els_prli(struct fc_rport_priv *rdata, u32 spp_len,
 926			     const struct fc_els_spp *spp_in,
 927			     struct fc_els_spp *spp_out)
 928{
 929	return FC_SPP_RESP_INVL;
 930}
 931
 932struct fc4_prov fc_lport_els_prov = {
 933	.prli = fc_lport_els_prli,
 934	.recv = fc_lport_recv_els_req,
 935};
 936
 937/**
 938 * fc_lport_recv() - The generic lport request handler
 939 * @lport: The lport that received the request
 940 * @fp: The frame the request is in
 941 *
 942 * Locking Note: This function should not be called with the lport
 943 *		 lock held because it may grab the lock.
 944 */
 945void fc_lport_recv(struct fc_lport *lport, struct fc_frame *fp)
 946{
 947	struct fc_frame_header *fh = fc_frame_header_get(fp);
 948	struct fc_seq *sp = fr_seq(fp);
 949	struct fc4_prov *prov;
 950
 951	/*
 952	 * Use RCU read lock and module_lock to be sure module doesn't
 953	 * deregister and get unloaded while we're calling it.
 954	 * try_module_get() is inlined and accepts a NULL parameter.
 955	 * Only ELSes and FCP target ops should come through here.
 956	 * The locking is unfortunate, and a better scheme is being sought.
 957	 */
 958
 959	rcu_read_lock();
 960	if (fh->fh_type >= FC_FC4_PROV_SIZE)
 961		goto drop;
 962	prov = rcu_dereference(fc_passive_prov[fh->fh_type]);
 963	if (!prov || !try_module_get(prov->module))
 964		goto drop;
 965	rcu_read_unlock();
 966	prov->recv(lport, fp);
 967	module_put(prov->module);
 968	return;
 969drop:
 970	rcu_read_unlock();
 971	FC_LPORT_DBG(lport, "dropping unexpected frame type %x\n", fh->fh_type);
 972	fc_frame_free(fp);
 973	if (sp)
 974		fc_exch_done(sp);
 975}
 976EXPORT_SYMBOL(fc_lport_recv);
 977
 978/**
 979 * fc_lport_reset() - Reset a local port
 980 * @lport: The local port which should be reset
 981 *
 982 * Locking Note: This functions should not be called with the
 983 *		 lport lock held.
 984 */
 985int fc_lport_reset(struct fc_lport *lport)
 986{
 987	cancel_delayed_work_sync(&lport->retry_work);
 988	mutex_lock(&lport->lp_mutex);
 989	fc_lport_enter_reset(lport);
 990	mutex_unlock(&lport->lp_mutex);
 991	return 0;
 992}
 993EXPORT_SYMBOL(fc_lport_reset);
 994
 995/**
 996 * fc_lport_reset_locked() - Reset the local port w/ the lport lock held
 997 * @lport: The local port to be reset
 998 */
 999static void fc_lport_reset_locked(struct fc_lport *lport)
1000{
1001	lockdep_assert_held(&lport->lp_mutex);
1002
1003	if (lport->dns_rdata) {
1004		fc_rport_logoff(lport->dns_rdata);
1005		lport->dns_rdata = NULL;
1006	}
1007
1008	if (lport->ptp_rdata) {
1009		fc_rport_logoff(lport->ptp_rdata);
1010		kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
1011		lport->ptp_rdata = NULL;
1012	}
1013
1014	lport->tt.disc_stop(lport);
1015
1016	lport->tt.exch_mgr_reset(lport, 0, 0);
1017	fc_host_fabric_name(lport->host) = 0;
1018
1019	if (lport->port_id && (!lport->point_to_multipoint || !lport->link_up))
1020		fc_lport_set_port_id(lport, 0, NULL);
1021}
1022
1023/**
1024 * fc_lport_enter_reset() - Reset the local port
1025 * @lport: The local port to be reset
1026 */
1027static void fc_lport_enter_reset(struct fc_lport *lport)
1028{
1029	lockdep_assert_held(&lport->lp_mutex);
1030
1031	FC_LPORT_DBG(lport, "Entered RESET state from %s state\n",
1032		     fc_lport_state(lport));
1033
1034	if (lport->state == LPORT_ST_DISABLED || lport->state == LPORT_ST_LOGO)
1035		return;
1036
1037	if (lport->vport) {
1038		if (lport->link_up)
1039			fc_vport_set_state(lport->vport, FC_VPORT_INITIALIZING);
1040		else
1041			fc_vport_set_state(lport->vport, FC_VPORT_LINKDOWN);
1042	}
1043	fc_lport_state_enter(lport, LPORT_ST_RESET);
1044	fc_host_post_event(lport->host, fc_get_event_number(),
1045			   FCH_EVT_LIPRESET, 0);
1046	fc_vports_linkchange(lport);
1047	fc_lport_reset_locked(lport);
1048	if (lport->link_up)
1049		fc_lport_enter_flogi(lport);
1050}
1051
1052/**
1053 * fc_lport_enter_disabled() - Disable the local port
1054 * @lport: The local port to be reset
1055 */
1056static void fc_lport_enter_disabled(struct fc_lport *lport)
1057{
1058	lockdep_assert_held(&lport->lp_mutex);
1059
1060	FC_LPORT_DBG(lport, "Entered disabled state from %s state\n",
1061		     fc_lport_state(lport));
1062
1063	fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1064	fc_vports_linkchange(lport);
1065	fc_lport_reset_locked(lport);
1066}
1067
1068/**
1069 * fc_lport_error() - Handler for any errors
1070 * @lport: The local port that the error was on
1071 * @fp:	   The error code encoded in a frame pointer
1072 *
1073 * If the error was caused by a resource allocation failure
1074 * then wait for half a second and retry, otherwise retry
1075 * after the e_d_tov time.
1076 */
1077static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
1078{
1079	unsigned long delay = 0;
1080	FC_LPORT_DBG(lport, "Error %ld in state %s, retries %d\n",
1081		     IS_ERR(fp) ? -PTR_ERR(fp) : 0, fc_lport_state(lport),
1082		     lport->retry_count);
1083
1084	if (PTR_ERR(fp) == -FC_EX_CLOSED)
1085		return;
1086
1087	/*
1088	 * Memory allocation failure, or the exchange timed out
1089	 * or we received LS_RJT.
1090	 * Retry after delay
1091	 */
1092	if (lport->retry_count < lport->max_retry_count) {
1093		lport->retry_count++;
1094		if (!fp)
1095			delay = msecs_to_jiffies(500);
1096		else
1097			delay =	msecs_to_jiffies(lport->e_d_tov);
1098
1099		schedule_delayed_work(&lport->retry_work, delay);
1100	} else
1101		fc_lport_enter_reset(lport);
1102}
1103
1104/**
1105 * fc_lport_ns_resp() - Handle response to a name server
1106 *			registration exchange
1107 * @sp:	    current sequence in exchange
1108 * @fp:	    response frame
1109 * @lp_arg: Fibre Channel host port instance
1110 *
1111 * Locking Note: This function will be called without the lport lock
1112 * held, but it will lock, call an _enter_* function or fc_lport_error()
1113 * and then unlock the lport.
1114 */
1115static void fc_lport_ns_resp(struct fc_seq *sp, struct fc_frame *fp,
1116			     void *lp_arg)
1117{
1118	struct fc_lport *lport = lp_arg;
1119	struct fc_frame_header *fh;
1120	struct fc_ct_hdr *ct;
1121
1122	FC_LPORT_DBG(lport, "Received a ns %s\n", fc_els_resp_type(fp));
1123
1124	if (fp == ERR_PTR(-FC_EX_CLOSED))
1125		return;
1126
1127	mutex_lock(&lport->lp_mutex);
1128
1129	if (lport->state < LPORT_ST_RNN_ID || lport->state > LPORT_ST_RFF_ID) {
1130		FC_LPORT_DBG(lport, "Received a name server response, "
1131			     "but in state %s\n", fc_lport_state(lport));
1132		if (IS_ERR(fp))
1133			goto err;
1134		goto out;
1135	}
1136
1137	if (IS_ERR(fp)) {
1138		fc_lport_error(lport, fp);
1139		goto err;
1140	}
1141
1142	fh = fc_frame_header_get(fp);
1143	ct = fc_frame_payload_get(fp, sizeof(*ct));
1144
1145	if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1146	    ct->ct_fs_type == FC_FST_DIR &&
1147	    ct->ct_fs_subtype == FC_NS_SUBTYPE &&
1148	    ntohs(ct->ct_cmd) == FC_FS_ACC)
1149		switch (lport->state) {
1150		case LPORT_ST_RNN_ID:
1151			fc_lport_enter_ns(lport, LPORT_ST_RSNN_NN);
1152			break;
1153		case LPORT_ST_RSNN_NN:
1154			fc_lport_enter_ns(lport, LPORT_ST_RSPN_ID);
1155			break;
1156		case LPORT_ST_RSPN_ID:
1157			fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1158			break;
1159		case LPORT_ST_RFT_ID:
1160			fc_lport_enter_ns(lport, LPORT_ST_RFF_ID);
1161			break;
1162		case LPORT_ST_RFF_ID:
1163			if (lport->fdmi_enabled)
1164				fc_lport_enter_fdmi(lport);
1165			else
1166				fc_lport_enter_scr(lport);
1167			break;
1168		default:
1169			/* should have already been caught by state checks */
1170			break;
1171		}
1172	else
1173		fc_lport_error(lport, fp);
1174out:
1175	fc_frame_free(fp);
1176err:
1177	mutex_unlock(&lport->lp_mutex);
1178}
1179
1180/**
1181 * fc_lport_ms_resp() - Handle response to a management server
1182 *			exchange
1183 * @sp:	    current sequence in exchange
1184 * @fp:	    response frame
1185 * @lp_arg: Fibre Channel host port instance
1186 *
1187 * Locking Note: This function will be called without the lport lock
1188 * held, but it will lock, call an _enter_* function or fc_lport_error()
1189 * and then unlock the lport.
1190 */
1191static void fc_lport_ms_resp(struct fc_seq *sp, struct fc_frame *fp,
1192			     void *lp_arg)
1193{
1194	struct fc_lport *lport = lp_arg;
1195	struct fc_frame_header *fh;
1196	struct fc_ct_hdr *ct;
1197	struct fc_host_attrs *fc_host = shost_to_fc_host(lport->host);
1198	FC_LPORT_DBG(lport, "Received a ms %s\n", fc_els_resp_type(fp));
1199
1200	if (fp == ERR_PTR(-FC_EX_CLOSED))
1201		return;
1202
1203	mutex_lock(&lport->lp_mutex);
1204
1205	if (lport->state < LPORT_ST_RHBA || lport->state > LPORT_ST_DPRT) {
1206		FC_LPORT_DBG(lport, "Received a management server response, "
1207			     "but in state %s\n", fc_lport_state(lport));
1208		if (IS_ERR(fp))
1209			goto err;
1210		goto out;
1211	}
1212
1213	if (IS_ERR(fp)) {
1214		fc_lport_error(lport, fp);
1215		goto err;
1216	}
1217
1218	fh = fc_frame_header_get(fp);
1219	ct = fc_frame_payload_get(fp, sizeof(*ct));
1220
1221	if (fh && ct && fh->fh_type == FC_TYPE_CT &&
1222	    ct->ct_fs_type == FC_FST_MGMT &&
1223	    ct->ct_fs_subtype == FC_FDMI_SUBTYPE) {
1224		FC_LPORT_DBG(lport, "Received a management server response, "
1225				    "reason=%d explain=%d\n",
1226				    ct->ct_reason,
1227				    ct->ct_explan);
1228
1229		switch (lport->state) {
1230		case LPORT_ST_RHBA:
1231			if ((ntohs(ct->ct_cmd) == FC_FS_RJT) && fc_host->fdmi_version == FDMI_V2) {
1232				FC_LPORT_DBG(lport, "Error for FDMI-V2, fall back to FDMI-V1\n");
1233				fc_host->fdmi_version = FDMI_V1;
1234
1235				fc_lport_enter_ms(lport, LPORT_ST_RHBA);
1236
1237			} else if (ntohs(ct->ct_cmd) == FC_FS_ACC)
1238				fc_lport_enter_ms(lport, LPORT_ST_RPA);
1239			else /* Error Skip RPA */
1240				fc_lport_enter_scr(lport);
1241			break;
1242		case LPORT_ST_RPA:
1243			fc_lport_enter_scr(lport);
1244			break;
1245		case LPORT_ST_DPRT:
1246			fc_lport_enter_ms(lport, LPORT_ST_RHBA);
1247			break;
1248		case LPORT_ST_DHBA:
1249			fc_lport_enter_ms(lport, LPORT_ST_DPRT);
1250			break;
1251		default:
1252			/* should have already been caught by state checks */
1253			break;
1254		}
1255	} else {
1256		/* Invalid Frame? */
1257		fc_lport_error(lport, fp);
1258	}
1259out:
1260	fc_frame_free(fp);
1261err:
1262	mutex_unlock(&lport->lp_mutex);
1263}
1264
1265/**
1266 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request
1267 * @sp:	    current sequence in SCR exchange
1268 * @fp:	    response frame
1269 * @lp_arg: Fibre Channel lport port instance that sent the registration request
1270 *
1271 * Locking Note: This function will be called without the lport lock
1272 * held, but it will lock, call an _enter_* function or fc_lport_error
1273 * and then unlock the lport.
1274 */
1275static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
1276			      void *lp_arg)
1277{
1278	struct fc_lport *lport = lp_arg;
1279	u8 op;
1280
1281	FC_LPORT_DBG(lport, "Received a SCR %s\n", fc_els_resp_type(fp));
1282
1283	if (fp == ERR_PTR(-FC_EX_CLOSED))
1284		return;
1285
1286	mutex_lock(&lport->lp_mutex);
1287
1288	if (lport->state != LPORT_ST_SCR) {
1289		FC_LPORT_DBG(lport, "Received a SCR response, but in state "
1290			     "%s\n", fc_lport_state(lport));
1291		if (IS_ERR(fp))
1292			goto err;
1293		goto out;
1294	}
1295
1296	if (IS_ERR(fp)) {
1297		fc_lport_error(lport, fp);
1298		goto err;
1299	}
1300
1301	op = fc_frame_payload_op(fp);
1302	if (op == ELS_LS_ACC)
1303		fc_lport_enter_ready(lport);
1304	else
1305		fc_lport_error(lport, fp);
1306
1307out:
1308	fc_frame_free(fp);
1309err:
1310	mutex_unlock(&lport->lp_mutex);
1311}
1312
1313/**
1314 * fc_lport_enter_scr() - Send a SCR (State Change Register) request
1315 * @lport: The local port to register for state changes
1316 */
1317static void fc_lport_enter_scr(struct fc_lport *lport)
1318{
1319	struct fc_frame *fp;
1320
1321	lockdep_assert_held(&lport->lp_mutex);
1322
1323	FC_LPORT_DBG(lport, "Entered SCR state from %s state\n",
1324		     fc_lport_state(lport));
1325
1326	fc_lport_state_enter(lport, LPORT_ST_SCR);
1327
1328	fp = fc_frame_alloc(lport, sizeof(struct fc_els_scr));
1329	if (!fp) {
1330		fc_lport_error(lport, fp);
1331		return;
1332	}
1333
1334	if (!lport->tt.elsct_send(lport, FC_FID_FCTRL, fp, ELS_SCR,
1335				  fc_lport_scr_resp, lport,
1336				  2 * lport->r_a_tov))
1337		fc_lport_error(lport, NULL);
1338}
1339
1340/**
1341 * fc_lport_enter_ns() - register some object with the name server
1342 * @lport: Fibre Channel local port to register
1343 * @state: Local port state
1344 */
1345static void fc_lport_enter_ns(struct fc_lport *lport, enum fc_lport_state state)
1346{
1347	struct fc_frame *fp;
1348	enum fc_ns_req cmd;
1349	int size = sizeof(struct fc_ct_hdr);
1350	size_t len;
1351
1352	lockdep_assert_held(&lport->lp_mutex);
1353
1354	FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1355		     fc_lport_state_names[state],
1356		     fc_lport_state(lport));
1357
1358	fc_lport_state_enter(lport, state);
1359
1360	switch (state) {
1361	case LPORT_ST_RNN_ID:
1362		cmd = FC_NS_RNN_ID;
1363		size += sizeof(struct fc_ns_rn_id);
1364		break;
1365	case LPORT_ST_RSNN_NN:
1366		len = strnlen(fc_host_symbolic_name(lport->host), 255);
1367		/* if there is no symbolic name, skip to RFT_ID */
1368		if (!len)
1369			return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1370		cmd = FC_NS_RSNN_NN;
1371		size += sizeof(struct fc_ns_rsnn) + len;
1372		break;
1373	case LPORT_ST_RSPN_ID:
1374		len = strnlen(fc_host_symbolic_name(lport->host), 255);
1375		/* if there is no symbolic name, skip to RFT_ID */
1376		if (!len)
1377			return fc_lport_enter_ns(lport, LPORT_ST_RFT_ID);
1378		cmd = FC_NS_RSPN_ID;
1379		size += sizeof(struct fc_ns_rspn) + len;
1380		break;
1381	case LPORT_ST_RFT_ID:
1382		cmd = FC_NS_RFT_ID;
1383		size += sizeof(struct fc_ns_rft);
1384		break;
1385	case LPORT_ST_RFF_ID:
1386		cmd = FC_NS_RFF_ID;
1387		size += sizeof(struct fc_ns_rff_id);
1388		break;
1389	default:
1390		fc_lport_error(lport, NULL);
1391		return;
1392	}
1393
1394	fp = fc_frame_alloc(lport, size);
1395	if (!fp) {
1396		fc_lport_error(lport, fp);
1397		return;
1398	}
1399
1400	if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, cmd,
1401				  fc_lport_ns_resp,
1402				  lport, 3 * lport->r_a_tov))
1403		fc_lport_error(lport, fp);
1404}
1405
1406static struct fc_rport_operations fc_lport_rport_ops = {
1407	.event_callback = fc_lport_rport_callback,
1408};
1409
1410/**
1411 * fc_lport_enter_dns() - Create a fc_rport for the name server
1412 * @lport: The local port requesting a remote port for the name server
1413 */
1414static void fc_lport_enter_dns(struct fc_lport *lport)
1415{
1416	struct fc_rport_priv *rdata;
1417
1418	lockdep_assert_held(&lport->lp_mutex);
1419
1420	FC_LPORT_DBG(lport, "Entered DNS state from %s state\n",
1421		     fc_lport_state(lport));
1422
1423	fc_lport_state_enter(lport, LPORT_ST_DNS);
1424
1425	mutex_lock(&lport->disc.disc_mutex);
1426	rdata = fc_rport_create(lport, FC_FID_DIR_SERV);
1427	mutex_unlock(&lport->disc.disc_mutex);
1428	if (!rdata)
1429		goto err;
1430
1431	rdata->ops = &fc_lport_rport_ops;
1432	fc_rport_login(rdata);
1433	return;
1434
1435err:
1436	fc_lport_error(lport, NULL);
1437}
1438
1439/**
1440 * fc_lport_enter_ms() - management server commands
1441 * @lport: Fibre Channel local port to register
1442 * @state: Local port state
1443 */
1444static void fc_lport_enter_ms(struct fc_lport *lport, enum fc_lport_state state)
1445{
1446	struct fc_frame *fp;
1447	enum fc_fdmi_req cmd;
1448	int size = sizeof(struct fc_ct_hdr);
1449	size_t len;
1450	int numattrs;
1451	struct fc_host_attrs *fc_host = shost_to_fc_host(lport->host);
1452	lockdep_assert_held(&lport->lp_mutex);
1453
1454	FC_LPORT_DBG(lport, "Entered %s state from %s state\n",
1455		     fc_lport_state_names[state],
1456		     fc_lport_state(lport));
1457
1458	fc_lport_state_enter(lport, state);
1459
1460	switch (state) {
1461	case LPORT_ST_RHBA:
1462		cmd = FC_FDMI_RHBA;
1463		/* Number of HBA Attributes */
1464		numattrs = 11;
1465		len = sizeof(struct fc_fdmi_rhba);
1466		len -= sizeof(struct fc_fdmi_attr_entry);
1467
1468		len += FC_FDMI_HBA_ATTR_NODENAME_LEN;
1469		len += FC_FDMI_HBA_ATTR_MANUFACTURER_LEN;
1470		len += FC_FDMI_HBA_ATTR_SERIALNUMBER_LEN;
1471		len += FC_FDMI_HBA_ATTR_MODEL_LEN;
1472		len += FC_FDMI_HBA_ATTR_MODELDESCR_LEN;
1473		len += FC_FDMI_HBA_ATTR_HARDWAREVERSION_LEN;
1474		len += FC_FDMI_HBA_ATTR_DRIVERVERSION_LEN;
1475		len += FC_FDMI_HBA_ATTR_OPTIONROMVERSION_LEN;
1476		len += FC_FDMI_HBA_ATTR_FIRMWAREVERSION_LEN;
1477		len += FC_FDMI_HBA_ATTR_OSNAMEVERSION_LEN;
1478		len += FC_FDMI_HBA_ATTR_MAXCTPAYLOAD_LEN;
1479
1480
1481		if (fc_host->fdmi_version == FDMI_V2) {
1482			numattrs += 7;
1483			len += FC_FDMI_HBA_ATTR_NODESYMBLNAME_LEN;
1484			len += FC_FDMI_HBA_ATTR_VENDORSPECIFICINFO_LEN;
1485			len += FC_FDMI_HBA_ATTR_NUMBEROFPORTS_LEN;
1486			len += FC_FDMI_HBA_ATTR_FABRICNAME_LEN;
1487			len += FC_FDMI_HBA_ATTR_BIOSVERSION_LEN;
1488			len += FC_FDMI_HBA_ATTR_BIOSSTATE_LEN;
1489			len += FC_FDMI_HBA_ATTR_VENDORIDENTIFIER_LEN;
1490		}
1491
1492		len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1493
1494		size += len;
1495		break;
1496	case LPORT_ST_RPA:
1497		cmd = FC_FDMI_RPA;
1498		/* Number of Port Attributes */
1499		numattrs = 6;
1500		len = sizeof(struct fc_fdmi_rpa);
1501		len -= sizeof(struct fc_fdmi_attr_entry);
1502		len += FC_FDMI_PORT_ATTR_FC4TYPES_LEN;
1503		len += FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN;
1504		len += FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN;
1505		len += FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN;
1506		len += FC_FDMI_PORT_ATTR_OSDEVICENAME_LEN;
1507		len += FC_FDMI_PORT_ATTR_HOSTNAME_LEN;
1508
1509		if (fc_host->fdmi_version == FDMI_V2) {
1510			numattrs += 10;
1511			len += FC_FDMI_PORT_ATTR_NODENAME_LEN;
1512			len += FC_FDMI_PORT_ATTR_PORTNAME_LEN;
1513			len += FC_FDMI_PORT_ATTR_SYMBOLICNAME_LEN;
1514			len += FC_FDMI_PORT_ATTR_PORTTYPE_LEN;
1515			len += FC_FDMI_PORT_ATTR_SUPPORTEDCLASSSRVC_LEN;
1516			len += FC_FDMI_PORT_ATTR_FABRICNAME_LEN;
1517			len += FC_FDMI_PORT_ATTR_CURRENTFC4TYPE_LEN;
1518			len += FC_FDMI_PORT_ATTR_PORTSTATE_LEN;
1519			len += FC_FDMI_PORT_ATTR_DISCOVEREDPORTS_LEN;
1520			len += FC_FDMI_PORT_ATTR_PORTID_LEN;
1521		}
1522
1523		len += (numattrs * FC_FDMI_ATTR_ENTRY_HEADER_LEN);
1524
1525		size += len;
1526		break;
1527	case LPORT_ST_DPRT:
1528		cmd = FC_FDMI_DPRT;
1529		len = sizeof(struct fc_fdmi_dprt);
1530		size += len;
1531		break;
1532	case LPORT_ST_DHBA:
1533		cmd = FC_FDMI_DHBA;
1534		len = sizeof(struct fc_fdmi_dhba);
1535		size += len;
1536		break;
1537	default:
1538		fc_lport_error(lport, NULL);
1539		return;
1540	}
1541
1542	FC_LPORT_DBG(lport, "Cmd=0x%x Len %d size %d\n",
1543			     cmd, (int)len, size);
1544	fp = fc_frame_alloc(lport, size);
1545	if (!fp) {
1546		fc_lport_error(lport, fp);
1547		return;
1548	}
1549
1550	if (!lport->tt.elsct_send(lport, FC_FID_MGMT_SERV, fp, cmd,
1551				  fc_lport_ms_resp,
1552				  lport, 3 * lport->r_a_tov))
1553		fc_lport_error(lport, fp);
1554}
1555
1556/**
1557 * fc_lport_enter_fdmi() - Create a fc_rport for the management server
1558 * @lport: The local port requesting a remote port for the management server
1559 */
1560static void fc_lport_enter_fdmi(struct fc_lport *lport)
1561{
1562	struct fc_rport_priv *rdata;
1563
1564	lockdep_assert_held(&lport->lp_mutex);
1565
1566	FC_LPORT_DBG(lport, "Entered FDMI state from %s state\n",
1567		     fc_lport_state(lport));
1568
1569	fc_lport_state_enter(lport, LPORT_ST_FDMI);
1570
1571	mutex_lock(&lport->disc.disc_mutex);
1572	rdata = fc_rport_create(lport, FC_FID_MGMT_SERV);
1573	mutex_unlock(&lport->disc.disc_mutex);
1574	if (!rdata)
1575		goto err;
1576
1577	rdata->ops = &fc_lport_rport_ops;
1578	fc_rport_login(rdata);
1579	return;
1580
1581err:
1582	fc_lport_error(lport, NULL);
1583}
1584
1585/**
1586 * fc_lport_timeout() - Handler for the retry_work timer
1587 * @work: The work struct of the local port
1588 */
1589static void fc_lport_timeout(struct work_struct *work)
1590{
1591	struct fc_lport *lport =
1592		container_of(work, struct fc_lport,
1593			     retry_work.work);
1594	struct fc_host_attrs *fc_host = shost_to_fc_host(lport->host);
1595
1596	mutex_lock(&lport->lp_mutex);
1597
1598	switch (lport->state) {
1599	case LPORT_ST_DISABLED:
1600		break;
1601	case LPORT_ST_READY:
1602		break;
1603	case LPORT_ST_RESET:
1604		break;
1605	case LPORT_ST_FLOGI:
1606		fc_lport_enter_flogi(lport);
1607		break;
1608	case LPORT_ST_DNS:
1609		fc_lport_enter_dns(lport);
1610		break;
1611	case LPORT_ST_RNN_ID:
1612	case LPORT_ST_RSNN_NN:
1613	case LPORT_ST_RSPN_ID:
1614	case LPORT_ST_RFT_ID:
1615	case LPORT_ST_RFF_ID:
1616		fc_lport_enter_ns(lport, lport->state);
1617		break;
1618	case LPORT_ST_FDMI:
1619		fc_lport_enter_fdmi(lport);
1620		break;
1621	case LPORT_ST_RHBA:
1622		if (fc_host->fdmi_version == FDMI_V2) {
1623			FC_LPORT_DBG(lport, "timeout for FDMI-V2 RHBA,fall back to FDMI-V1\n");
1624			fc_host->fdmi_version = FDMI_V1;
1625			fc_lport_enter_ms(lport, LPORT_ST_RHBA);
1626			break;
1627		}
1628		fallthrough;
1629	case LPORT_ST_RPA:
1630	case LPORT_ST_DHBA:
1631	case LPORT_ST_DPRT:
1632		FC_LPORT_DBG(lport, "Skipping lport state %s to SCR\n",
1633			     fc_lport_state(lport));
1634		fallthrough;
1635	case LPORT_ST_SCR:
1636		fc_lport_enter_scr(lport);
1637		break;
1638	case LPORT_ST_LOGO:
1639		fc_lport_enter_logo(lport);
1640		break;
1641	}
1642
1643	mutex_unlock(&lport->lp_mutex);
1644}
1645
1646/**
1647 * fc_lport_logo_resp() - Handle response to LOGO request
1648 * @sp:	    The sequence that the LOGO was on
1649 * @fp:	    The LOGO frame
1650 * @lp_arg: The lport port that received the LOGO request
1651 *
1652 * Locking Note: This function will be called without the lport lock
1653 * held, but it will lock, call an _enter_* function or fc_lport_error()
1654 * and then unlock the lport.
1655 */
1656void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
1657			void *lp_arg)
1658{
1659	struct fc_lport *lport = lp_arg;
1660	u8 op;
1661
1662	FC_LPORT_DBG(lport, "Received a LOGO %s\n", fc_els_resp_type(fp));
1663
1664	if (fp == ERR_PTR(-FC_EX_CLOSED))
1665		return;
1666
1667	mutex_lock(&lport->lp_mutex);
1668
1669	if (lport->state != LPORT_ST_LOGO) {
1670		FC_LPORT_DBG(lport, "Received a LOGO response, but in state "
1671			     "%s\n", fc_lport_state(lport));
1672		if (IS_ERR(fp))
1673			goto err;
1674		goto out;
1675	}
1676
1677	if (IS_ERR(fp)) {
1678		fc_lport_error(lport, fp);
1679		goto err;
1680	}
1681
1682	op = fc_frame_payload_op(fp);
1683	if (op == ELS_LS_ACC)
1684		fc_lport_enter_disabled(lport);
1685	else
1686		fc_lport_error(lport, fp);
1687
1688out:
1689	fc_frame_free(fp);
1690err:
1691	mutex_unlock(&lport->lp_mutex);
1692}
1693EXPORT_SYMBOL(fc_lport_logo_resp);
1694
1695/**
1696 * fc_lport_enter_logo() - Logout of the fabric
1697 * @lport: The local port to be logged out
1698 */
1699static void fc_lport_enter_logo(struct fc_lport *lport)
1700{
1701	struct fc_frame *fp;
1702	struct fc_els_logo *logo;
1703
1704	lockdep_assert_held(&lport->lp_mutex);
1705
1706	FC_LPORT_DBG(lport, "Entered LOGO state from %s state\n",
1707		     fc_lport_state(lport));
1708
1709	fc_lport_state_enter(lport, LPORT_ST_LOGO);
1710	fc_vports_linkchange(lport);
1711
1712	fp = fc_frame_alloc(lport, sizeof(*logo));
1713	if (!fp) {
1714		fc_lport_error(lport, fp);
1715		return;
1716	}
1717
1718	if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp, ELS_LOGO,
1719				  fc_lport_logo_resp, lport,
1720				  2 * lport->r_a_tov))
1721		fc_lport_error(lport, NULL);
1722}
1723
1724/**
1725 * fc_lport_flogi_resp() - Handle response to FLOGI request
1726 * @sp:	    The sequence that the FLOGI was on
1727 * @fp:	    The FLOGI response frame
1728 * @lp_arg: The lport port that received the FLOGI response
1729 *
1730 * Locking Note: This function will be called without the lport lock
1731 * held, but it will lock, call an _enter_* function or fc_lport_error()
1732 * and then unlock the lport.
1733 */
1734void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
1735			 void *lp_arg)
1736{
1737	struct fc_lport *lport = lp_arg;
1738	struct fc_frame_header *fh;
1739	struct fc_els_flogi *flp;
1740	u32 did;
1741	u16 csp_flags;
1742	unsigned int r_a_tov;
1743	unsigned int e_d_tov;
1744	u16 mfs;
1745
1746	FC_LPORT_DBG(lport, "Received a FLOGI %s\n", fc_els_resp_type(fp));
1747
1748	if (fp == ERR_PTR(-FC_EX_CLOSED))
1749		return;
1750
1751	mutex_lock(&lport->lp_mutex);
1752
1753	if (lport->state != LPORT_ST_FLOGI) {
1754		FC_LPORT_DBG(lport, "Received a FLOGI response, but in state "
1755			     "%s\n", fc_lport_state(lport));
1756		if (IS_ERR(fp))
1757			goto err;
1758		goto out;
1759	}
1760
1761	if (IS_ERR(fp)) {
1762		fc_lport_error(lport, fp);
1763		goto err;
1764	}
1765
1766	fh = fc_frame_header_get(fp);
1767	did = fc_frame_did(fp);
1768	if (fh->fh_r_ctl != FC_RCTL_ELS_REP || did == 0 ||
1769	    fc_frame_payload_op(fp) != ELS_LS_ACC) {
1770		FC_LPORT_DBG(lport, "FLOGI not accepted or bad response\n");
1771		fc_lport_error(lport, fp);
1772		goto out;
1773	}
1774
1775	flp = fc_frame_payload_get(fp, sizeof(*flp));
1776	if (!flp) {
1777		FC_LPORT_DBG(lport, "FLOGI bad response\n");
1778		fc_lport_error(lport, fp);
1779		goto out;
1780	}
1781
1782	mfs = ntohs(flp->fl_csp.sp_bb_data) &
1783		FC_SP_BB_DATA_MASK;
1784
1785	if (mfs < FC_SP_MIN_MAX_PAYLOAD || mfs > FC_SP_MAX_MAX_PAYLOAD) {
1786		FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
1787			     "lport->mfs:%u\n", mfs, lport->mfs);
1788		fc_lport_error(lport, fp);
1789		goto out;
1790	}
1791
1792	if (mfs <= lport->mfs) {
1793		lport->mfs = mfs;
1794		fc_host_maxframe_size(lport->host) = mfs;
1795	}
1796
1797	csp_flags = ntohs(flp->fl_csp.sp_features);
1798	r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
1799	e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
1800	if (csp_flags & FC_SP_FT_EDTR)
1801		e_d_tov /= 1000000;
1802
1803	lport->npiv_enabled = !!(csp_flags & FC_SP_FT_NPIV_ACC);
1804
1805	if ((csp_flags & FC_SP_FT_FPORT) == 0) {
1806		if (e_d_tov > lport->e_d_tov)
1807			lport->e_d_tov = e_d_tov;
1808		lport->r_a_tov = 2 * lport->e_d_tov;
1809		fc_lport_set_port_id(lport, did, fp);
1810		printk(KERN_INFO "host%d: libfc: "
1811		       "Port (%6.6x) entered "
1812		       "point-to-point mode\n",
1813		       lport->host->host_no, did);
1814		fc_lport_ptp_setup(lport, fc_frame_sid(fp),
1815				   get_unaligned_be64(
1816					   &flp->fl_wwpn),
1817				   get_unaligned_be64(
1818					   &flp->fl_wwnn));
1819	} else {
1820		if (e_d_tov > lport->e_d_tov)
1821			lport->e_d_tov = e_d_tov;
1822		if (r_a_tov > lport->r_a_tov)
1823			lport->r_a_tov = r_a_tov;
1824		fc_host_fabric_name(lport->host) =
1825			get_unaligned_be64(&flp->fl_wwnn);
1826		fc_lport_set_port_id(lport, did, fp);
1827		fc_lport_enter_dns(lport);
1828	}
1829
1830out:
1831	fc_frame_free(fp);
1832err:
1833	mutex_unlock(&lport->lp_mutex);
1834}
1835EXPORT_SYMBOL(fc_lport_flogi_resp);
1836
1837/**
1838 * fc_lport_enter_flogi() - Send a FLOGI request to the fabric manager
1839 * @lport: Fibre Channel local port to be logged in to the fabric
1840 */
1841static void fc_lport_enter_flogi(struct fc_lport *lport)
1842{
1843	struct fc_frame *fp;
1844
1845	lockdep_assert_held(&lport->lp_mutex);
1846
1847	FC_LPORT_DBG(lport, "Entered FLOGI state from %s state\n",
1848		     fc_lport_state(lport));
1849
1850	fc_lport_state_enter(lport, LPORT_ST_FLOGI);
1851
1852	if (lport->point_to_multipoint) {
1853		if (lport->port_id)
1854			fc_lport_enter_ready(lport);
1855		return;
1856	}
1857
1858	fp = fc_frame_alloc(lport, sizeof(struct fc_els_flogi));
1859	if (!fp)
1860		return fc_lport_error(lport, fp);
1861
1862	if (!lport->tt.elsct_send(lport, FC_FID_FLOGI, fp,
1863				  lport->vport ? ELS_FDISC : ELS_FLOGI,
1864				  fc_lport_flogi_resp, lport,
1865				  lport->vport ? 2 * lport->r_a_tov :
1866				  lport->e_d_tov))
1867		fc_lport_error(lport, NULL);
1868}
1869
1870/**
1871 * fc_lport_config() - Configure a fc_lport
1872 * @lport: The local port to be configured
1873 */
1874int fc_lport_config(struct fc_lport *lport)
1875{
1876	INIT_DELAYED_WORK(&lport->retry_work, fc_lport_timeout);
1877	mutex_init(&lport->lp_mutex);
1878
1879	fc_lport_state_enter(lport, LPORT_ST_DISABLED);
1880
1881	fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
1882	fc_lport_add_fc4_type(lport, FC_TYPE_CT);
1883	fc_fc4_conf_lport_params(lport, FC_TYPE_FCP);
1884
1885	return 0;
1886}
1887EXPORT_SYMBOL(fc_lport_config);
1888
1889/**
1890 * fc_lport_init() - Initialize the lport layer for a local port
1891 * @lport: The local port to initialize the exchange layer for
1892 */
1893int fc_lport_init(struct fc_lport *lport)
1894{
1895	struct fc_host_attrs *fc_host;
1896
1897	fc_host = shost_to_fc_host(lport->host);
1898
1899	/* Set FDMI version to FDMI-2 specification*/
1900	fc_host->fdmi_version = FDMI_V2;
1901
1902	fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
1903	fc_host_node_name(lport->host) = lport->wwnn;
1904	fc_host_port_name(lport->host) = lport->wwpn;
1905	fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
1906	memset(fc_host_supported_fc4s(lport->host), 0,
1907	       sizeof(fc_host_supported_fc4s(lport->host)));
1908	fc_host_supported_fc4s(lport->host)[2] = 1;
1909	fc_host_supported_fc4s(lport->host)[7] = 1;
1910	fc_host_num_discovered_ports(lport->host) = 4;
1911
1912	/* This value is also unchanging */
1913	memset(fc_host_active_fc4s(lport->host), 0,
1914	       sizeof(fc_host_active_fc4s(lport->host)));
1915	fc_host_active_fc4s(lport->host)[2] = 1;
1916	fc_host_active_fc4s(lport->host)[7] = 1;
1917	fc_host_maxframe_size(lport->host) = lport->mfs;
1918	fc_host_supported_speeds(lport->host) = 0;
1919	if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
1920		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
1921	if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
1922		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
1923	if (lport->link_supported_speeds & FC_PORTSPEED_40GBIT)
1924		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_40GBIT;
1925	if (lport->link_supported_speeds & FC_PORTSPEED_100GBIT)
1926		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_100GBIT;
1927	if (lport->link_supported_speeds & FC_PORTSPEED_25GBIT)
1928		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_25GBIT;
1929	if (lport->link_supported_speeds & FC_PORTSPEED_50GBIT)
1930		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_50GBIT;
1931	if (lport->link_supported_speeds & FC_PORTSPEED_100GBIT)
1932		fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_100GBIT;
1933
1934	fc_fc4_add_lport(lport);
1935
1936	fc_host_num_discovered_ports(lport->host) = DISCOVERED_PORTS;
1937	fc_host_port_state(lport->host) = FC_PORTSTATE_ONLINE;
1938	fc_host_max_ct_payload(lport->host) = MAX_CT_PAYLOAD;
1939	fc_host_num_ports(lport->host) = NUMBER_OF_PORTS;
1940	fc_host_bootbios_state(lport->host) = 0X00000000;
1941	snprintf(fc_host_bootbios_version(lport->host),
1942		FC_SYMBOLIC_NAME_SIZE, "%s", "Unknown");
1943
1944	return 0;
1945}
1946EXPORT_SYMBOL(fc_lport_init);
1947
1948/**
1949 * fc_lport_bsg_resp() - The common response handler for FC Passthrough requests
1950 * @sp:	      The sequence for the FC Passthrough response
1951 * @fp:	      The response frame
1952 * @info_arg: The BSG info that the response is for
1953 */
1954static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
1955			      void *info_arg)
1956{
1957	struct fc_bsg_info *info = info_arg;
1958	struct bsg_job *job = info->job;
1959	struct fc_bsg_reply *bsg_reply = job->reply;
1960	struct fc_lport *lport = info->lport;
1961	struct fc_frame_header *fh;
1962	size_t len;
1963	void *buf;
1964
1965	if (IS_ERR(fp)) {
1966		bsg_reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
1967			-ECONNABORTED : -ETIMEDOUT;
1968		job->reply_len = sizeof(uint32_t);
1969		bsg_job_done(job, bsg_reply->result,
1970			       bsg_reply->reply_payload_rcv_len);
1971		kfree(info);
1972		return;
1973	}
1974
1975	mutex_lock(&lport->lp_mutex);
1976	fh = fc_frame_header_get(fp);
1977	len = fr_len(fp) - sizeof(*fh);
1978	buf = fc_frame_payload_get(fp, 0);
1979
1980	if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
1981		/* Get the response code from the first frame payload */
1982		unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
1983			ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
1984			(unsigned short)fc_frame_payload_op(fp);
1985
1986		/* Save the reply status of the job */
1987		bsg_reply->reply_data.ctels_reply.status =
1988			(cmd == info->rsp_code) ?
1989			FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT;
1990	}
1991
1992	bsg_reply->reply_payload_rcv_len +=
1993		fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
1994					 &info->offset, NULL);
1995
1996	if (fr_eof(fp) == FC_EOF_T &&
1997	    (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
1998	    (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
1999		if (bsg_reply->reply_payload_rcv_len >
2000		    job->reply_payload.payload_len)
2001			bsg_reply->reply_payload_rcv_len =
2002				job->reply_payload.payload_len;
2003		bsg_reply->result = 0;
2004		bsg_job_done(job, bsg_reply->result,
2005			       bsg_reply->reply_payload_rcv_len);
2006		kfree(info);
2007	}
2008	fc_frame_free(fp);
2009	mutex_unlock(&lport->lp_mutex);
2010}
2011
2012/**
2013 * fc_lport_els_request() - Send ELS passthrough request
2014 * @job:   The BSG Passthrough job
2015 * @lport: The local port sending the request
2016 * @did:   The destination port id
2017 * @tov:   The timeout period (in ms)
2018 */
2019static int fc_lport_els_request(struct bsg_job *job,
2020				struct fc_lport *lport,
2021				u32 did, u32 tov)
2022{
2023	struct fc_bsg_info *info;
2024	struct fc_frame *fp;
2025	struct fc_frame_header *fh;
2026	char *pp;
2027	int len;
2028
2029	lockdep_assert_held(&lport->lp_mutex);
2030
2031	fp = fc_frame_alloc(lport, job->request_payload.payload_len);
2032	if (!fp)
2033		return -ENOMEM;
2034
2035	len = job->request_payload.payload_len;
2036	pp = fc_frame_payload_get(fp, len);
2037
2038	sg_copy_to_buffer(job->request_payload.sg_list,
2039			  job->request_payload.sg_cnt,
2040			  pp, len);
2041
2042	fh = fc_frame_header_get(fp);
2043	fh->fh_r_ctl = FC_RCTL_ELS_REQ;
2044	hton24(fh->fh_d_id, did);
2045	hton24(fh->fh_s_id, lport->port_id);
2046	fh->fh_type = FC_TYPE_ELS;
2047	hton24(fh->fh_f_ctl, FC_FCTL_REQ);
2048	fh->fh_cs_ctl = 0;
2049	fh->fh_df_ctl = 0;
2050	fh->fh_parm_offset = 0;
2051
2052	info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2053	if (!info) {
2054		fc_frame_free(fp);
2055		return -ENOMEM;
2056	}
2057
2058	info->job = job;
2059	info->lport = lport;
2060	info->rsp_code = ELS_LS_ACC;
2061	info->nents = job->reply_payload.sg_cnt;
2062	info->sg = job->reply_payload.sg_list;
2063
2064	if (!fc_exch_seq_send(lport, fp, fc_lport_bsg_resp,
2065			      NULL, info, tov)) {
2066		kfree(info);
2067		return -ECOMM;
2068	}
2069	return 0;
2070}
2071
2072/**
2073 * fc_lport_ct_request() - Send CT Passthrough request
2074 * @job:   The BSG Passthrough job
2075 * @lport: The local port sending the request
2076 * @did:   The destination FC-ID
2077 * @tov:   The timeout period to wait for the response
2078 */
2079static int fc_lport_ct_request(struct bsg_job *job,
2080			       struct fc_lport *lport, u32 did, u32 tov)
2081{
2082	struct fc_bsg_info *info;
2083	struct fc_frame *fp;
2084	struct fc_frame_header *fh;
2085	struct fc_ct_req *ct;
2086	size_t len;
2087
2088	lockdep_assert_held(&lport->lp_mutex);
2089
2090	fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
2091			    job->request_payload.payload_len);
2092	if (!fp)
2093		return -ENOMEM;
2094
2095	len = job->request_payload.payload_len;
2096	ct = fc_frame_payload_get(fp, len);
2097
2098	sg_copy_to_buffer(job->request_payload.sg_list,
2099			  job->request_payload.sg_cnt,
2100			  ct, len);
2101
2102	fh = fc_frame_header_get(fp);
2103	fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL;
2104	hton24(fh->fh_d_id, did);
2105	hton24(fh->fh_s_id, lport->port_id);
2106	fh->fh_type = FC_TYPE_CT;
2107	hton24(fh->fh_f_ctl, FC_FCTL_REQ);
2108	fh->fh_cs_ctl = 0;
2109	fh->fh_df_ctl = 0;
2110	fh->fh_parm_offset = 0;
2111
2112	info = kzalloc(sizeof(struct fc_bsg_info), GFP_KERNEL);
2113	if (!info) {
2114		fc_frame_free(fp);
2115		return -ENOMEM;
2116	}
2117
2118	info->job = job;
2119	info->lport = lport;
2120	info->rsp_code = FC_FS_ACC;
2121	info->nents = job->reply_payload.sg_cnt;
2122	info->sg = job->reply_payload.sg_list;
2123
2124	if (!fc_exch_seq_send(lport, fp, fc_lport_bsg_resp,
2125			      NULL, info, tov)) {
2126		kfree(info);
2127		return -ECOMM;
2128	}
2129	return 0;
2130}
2131
2132/**
2133 * fc_lport_bsg_request() - The common entry point for sending
2134 *			    FC Passthrough requests
2135 * @job: The BSG passthrough job
2136 */
2137int fc_lport_bsg_request(struct bsg_job *job)
2138{
2139	struct fc_bsg_request *bsg_request = job->request;
2140	struct fc_bsg_reply *bsg_reply = job->reply;
2141	struct Scsi_Host *shost = fc_bsg_to_shost(job);
2142	struct fc_lport *lport = shost_priv(shost);
2143	struct fc_rport *rport;
2144	struct fc_rport_priv *rdata;
2145	int rc = -EINVAL;
2146	u32 did, tov;
2147
2148	bsg_reply->reply_payload_rcv_len = 0;
2149
2150	mutex_lock(&lport->lp_mutex);
2151
2152	switch (bsg_request->msgcode) {
2153	case FC_BSG_RPT_ELS:
2154		rport = fc_bsg_to_rport(job);
2155		if (!rport)
2156			break;
2157
2158		rdata = rport->dd_data;
2159		rc = fc_lport_els_request(job, lport, rport->port_id,
2160					  rdata->e_d_tov);
2161		break;
2162
2163	case FC_BSG_RPT_CT:
2164		rport = fc_bsg_to_rport(job);
2165		if (!rport)
2166			break;
2167
2168		rdata = rport->dd_data;
2169		rc = fc_lport_ct_request(job, lport, rport->port_id,
2170					 rdata->e_d_tov);
2171		break;
2172
2173	case FC_BSG_HST_CT:
2174		did = ntoh24(bsg_request->rqst_data.h_ct.port_id);
2175		if (did == FC_FID_DIR_SERV) {
2176			rdata = lport->dns_rdata;
2177			if (!rdata)
2178				break;
2179			tov = rdata->e_d_tov;
2180		} else {
2181			rdata = fc_rport_lookup(lport, did);
2182			if (!rdata)
2183				break;
2184			tov = rdata->e_d_tov;
2185			kref_put(&rdata->kref, fc_rport_destroy);
2186		}
2187
2188		rc = fc_lport_ct_request(job, lport, did, tov);
2189		break;
2190
2191	case FC_BSG_HST_ELS_NOLOGIN:
2192		did = ntoh24(bsg_request->rqst_data.h_els.port_id);
2193		rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
2194		break;
2195	}
2196
2197	mutex_unlock(&lport->lp_mutex);
2198	return rc;
2199}
2200EXPORT_SYMBOL(fc_lport_bsg_request);