Release 4.11 drivers/scsi/libfc/fc_lport.c

/*
 * Copyright(c) 2007 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Maintained at www.Open-FCoE.org
 */

/*
 * PORT LOCKING NOTES
 *
 * These comments only apply to the 'port code' which consists of the lport,
 * disc and rport blocks.
 *
 * MOTIVATION
 *
 * The lport, disc and rport blocks all have mutexes that are used to protect
 * those objects. The main motivation for these locks is to prevent from
 * having an lport reset just before we send a frame. In that scenario the
 * lport's FID would get set to zero and then we'd send a frame with an
 * invalid SID. We also need to ensure that states don't change unexpectedly
 * while processing another state.
 *
 * HIERARCHY
 *
 * The following hierarchy defines the locking rules. A greater lock
 * may be held before acquiring a lesser lock, but a lesser lock should never
 * be held while attempting to acquire a greater lock. Here is the hierarchy-
 *
 * lport > disc, lport > rport, disc > rport
 *
 * CALLBACKS
 *
 * The callbacks cause complications with this scheme. There is a callback
 * from the rport (to either lport or disc) and a callback from disc
 * (to the lport).
 *
 * As rports exit the rport state machine a callback is made to the owner of
 * the rport to notify success or failure. Since the callback is likely to
 * cause the lport or disc to grab its lock we cannot hold the rport lock
 * while making the callback. To ensure that the rport is not free'd while
 * processing the callback the rport callbacks are serialized through a
 * single-threaded workqueue. An rport would never be free'd while in a
 * callback handler because no other rport work in this queue can be executed
 * at the same time.
 *
 * When discovery succeeds or fails a callback is made to the lport as
 * notification. Currently, successful discovery causes the lport to take no
 * action. A failure will cause the lport to reset. There is likely a circular
 * locking problem with this implementation.
 */

/*
 * LPORT LOCKING
 *
 * The critical sections protected by the lport's mutex are quite broad and
 * may be improved upon in the future. The lport code and its locking doesn't
 * influence the I/O path, so excessive locking doesn't penalize I/O
 * performance.
 *
 * The strategy is to lock whenever processing a request or response. Note
 * that every _enter_* function corresponds to a state change. They generally
 * change the lports state and then send a request out on the wire. We lock
 * before calling any of these functions to protect that state change. This
 * means that the entry points into the lport block manage the locks while
 * the state machine can transition between states (i.e. _enter_* functions)
 * while always staying protected.
 *
 * When handling responses we also hold the lport mutex broadly. When the
 * lport receives the response frame it locks the mutex and then calls the
 * appropriate handler for the particuar response. Generally a response will
 * trigger a state change and so the lock must already be held.
 *
 * Retries also have to consider the locking. The retries occur from a work
 * context and the work function will lock the lport and then retry the state
 * (i.e. _enter_* function).
 */

#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#include <scsi/fc/fc_gs.h>

#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
#include <linux/scatterlist.h>

#include "fc_libfc.h"

/* Fabric IDs to use for point-to-point mode, chosen on whims. */

#define FC_LOCAL_PTP_FID_LO   0x010101

#define FC_LOCAL_PTP_FID_HI   0x010102


#define	DNS_DELAY	      3 
/* Discovery delay after RSCN (in seconds)*/

static void fc_lport_error(struct fc_lport *, struct fc_frame *);

static void fc_lport_enter_reset(struct fc_lport *);
static void fc_lport_enter_flogi(struct fc_lport *);
static void fc_lport_enter_dns(struct fc_lport *);
static void fc_lport_enter_ns(struct fc_lport *, enum fc_lport_state);
static void fc_lport_enter_scr(struct fc_lport *);
static void fc_lport_enter_ready(struct fc_lport *);
static void fc_lport_enter_logo(struct fc_lport *);
static void fc_lport_enter_fdmi(struct fc_lport *lport);
static void fc_lport_enter_ms(struct fc_lport *, enum fc_lport_state);


static const char *fc_lport_state_names[] = {
	[LPORT_ST_DISABLED] = "disabled",
	[LPORT_ST_FLOGI] =    "FLOGI",
	[LPORT_ST_DNS] =      "dNS",
	[LPORT_ST_RNN_ID] =   "RNN_ID",
	[LPORT_ST_RSNN_NN] =  "RSNN_NN",
	[LPORT_ST_RSPN_ID] =  "RSPN_ID",
	[LPORT_ST_RFT_ID] =   "RFT_ID",
	[LPORT_ST_RFF_ID] =   "RFF_ID",
	[LPORT_ST_FDMI] =     "FDMI",
	[LPORT_ST_RHBA] =     "RHBA",
	[LPORT_ST_RPA] =      "RPA",
	[LPORT_ST_DHBA] =     "DHBA",
	[LPORT_ST_DPRT] =     "DPRT",
	[LPORT_ST_SCR] =      "SCR",
	[LPORT_ST_READY] =    "Ready",
	[LPORT_ST_LOGO] =     "LOGO",
	[LPORT_ST_RESET] =    "reset",
};

/**
 * struct fc_bsg_info - FC Passthrough managemet structure
 * @job:      The passthrough job
 * @lport:    The local port to pass through a command
 * @rsp_code: The expected response code
 * @sg:       job->reply_payload.sg_list
 * @nents:    job->reply_payload.sg_cnt
 * @offset:   The offset into the response data
 */

struct fc_bsg_info {
	
struct bsg_job *job;
	
struct fc_lport *lport;
	
u16 rsp_code;
	
struct scatterlist *sg;
	
u32 nents;
	
size_t offset;
};

/**
 * fc_frame_drop() - Dummy frame handler
 * @lport: The local port the frame was received on
 * @fp:    The received frame
 */


static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
{
	fc_frame_free(fp);
	return 0;
}

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/**
 * fc_lport_rport_callback() - Event handler for rport events
 * @lport: The lport which is receiving the event
 * @rdata: private remote port data
 * @event: The event that occurred
 *
 * Locking Note: The rport lock should not be held when calling
 *               this function.
 */


static void fc_lport_rport_callback(struct fc_lport *lport,
				    struct fc_rport_priv *rdata,
				    enum fc_rport_event event)
{
	FC_LPORT_DBG(lport, "Received a %d event for port (%6.6x)\n", event,
		     rdata->ids.port_id);

	mutex_lock(&lport->lp_mutex);
	switch (event) {
	case RPORT_EV_READY:
		if (lport->state == LPORT_ST_DNS) {
			lport->dns_rdata = rdata;
			fc_lport_enter_ns(lport, LPORT_ST_RNN_ID);
		} else if (lport->state == LPORT_ST_FDMI) {
			lport->ms_rdata = rdata;
			fc_lport_enter_ms(lport, LPORT_ST_DHBA);
		} else {
			FC_LPORT_DBG(lport, "Received an READY event "
				     "on port (%6.6x) for the directory "
				     "server, but the lport is not "
				     "in the DNS or FDMI state, it's in the "
				     "%d state", rdata->ids.port_id,
				     lport->state);
			fc_rport_logoff(rdata);
		}
		break;
	case RPORT_EV_LOGO:
	case RPORT_EV_FAILED:
	case RPORT_EV_STOP:
		if (rdata->ids.port_id == FC_FID_DIR_SERV)
			lport->dns_rdata = NULL;
		else if (rdata->ids.port_id == FC_FID_MGMT_SERV)
			lport->ms_rdata = NULL;
		break;
	case RPORT_EV_NONE:
		break;
	}
	mutex_unlock(&lport->lp_mutex);
}

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/**
 * fc_lport_state() - Return a string which represents the lport's state
 * @lport: The lport whose state is to converted to a string
 */


static const char *fc_lport_state(struct fc_lport *lport)
{
	const char *cp;

	cp = fc_lport_state_names[lport->state];
	if (!cp)
		cp = "unknown";
	return cp;
}

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/**
 * fc_lport_ptp_setup() - Create an rport for point-to-point mode
 * @lport:       The lport to attach the ptp rport to
 * @remote_fid:  The FID of the ptp rport
 * @remote_wwpn: The WWPN of the ptp rport
 * @remote_wwnn: The WWNN of the ptp rport
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this routine.
 */


static void fc_lport_ptp_setup(struct fc_lport *lport,
			       u32 remote_fid, u64 remote_wwpn,
			       u64 remote_wwnn)
{
	if (lport->ptp_rdata) {
		fc_rport_logoff(lport->ptp_rdata);
		kref_put(&lport->ptp_rdata->kref, fc_rport_destroy);
	}
	mutex_lock(&lport->disc.disc_mutex);
	lport->ptp_rdata = fc_rport_create(lport, remote_fid);
	kref_get(&lport->ptp_rdata->kref);
	lport->ptp_rdata->ids.port_name = remote_wwpn;
	lport->ptp_rdata->ids.node_name = remote_wwnn;
	mutex_unlock(&lport->disc.disc_mutex);

	fc_rport_login(lport->ptp_rdata);

	fc_lport_enter_ready(lport);
}

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/**
 * fc_get_host_port_state() - Return the port state of the given Scsi_Host
 * @shost:  The SCSI host whose port state is to be determined
 */


void fc_get_host_port_state(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);

	mutex_lock(&lport->lp_mutex);
	if (!lport->link_up)
		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
	else
		switch (lport->state) {
		case LPORT_ST_READY:
			fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
			break;
		default:
			fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
		}
	mutex_unlock(&lport->lp_mutex);
}
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EXPORT_SYMBOL(fc_get_host_port_state);

/**
 * fc_get_host_speed() - Return the speed of the given Scsi_Host
 * @shost: The SCSI host whose port speed is to be determined
 */


void fc_get_host_speed(struct Scsi_Host *shost)
{
	struct fc_lport *lport = shost_priv(shost);

	fc_host_speed(shost) = lport->link_speed;
}
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EXPORT_SYMBOL(fc_get_host_speed);

/**
 * fc_get_host_stats() - Return the Scsi_Host's statistics
 * @shost: The SCSI host whose statistics are to be returned
 */


struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
{
	struct fc_host_statistics *fc_stats;
	struct fc_lport *lport = shost_priv(shost);
	unsigned int cpu;
	u64 fcp_in_bytes = 0;
	u64 fcp_out_bytes = 0;

	fc_stats = &lport->host_stats;
	memset(fc_stats, 0, sizeof(struct fc_host_statistics));

	fc_stats->seconds_since_last_reset = (jiffies - lport->boot_time) / HZ;

	for_each_possible_cpu(cpu) {
		struct fc_stats *stats;

		stats = per_cpu_ptr(lport->stats, cpu);

		fc_stats->tx_frames += stats->TxFrames;
		fc_stats->tx_words += stats->TxWords;
		fc_stats->rx_frames += stats->RxFrames;
		fc_stats->rx_words += stats->RxWords;
		fc_stats->error_frames += stats->ErrorFrames;
		fc_stats->invalid_crc_count += stats->InvalidCRCCount;
		fc_stats->fcp_input_requests += stats->InputRequests;
		fc_stats->fcp_output_requests += stats->OutputRequests;
		fc_stats->fcp_control_requests += stats->ControlRequests;
		fcp_in_bytes += stats->InputBytes;
		fcp_out_bytes += stats->OutputBytes;
		fc_stats->fcp_packet_alloc_failures += stats->FcpPktAllocFails;
		fc_stats->fcp_packet_aborts += stats->FcpPktAborts;
		fc_stats->fcp_frame_alloc_failures += stats->FcpFrameAllocFails;
		fc_stats->link_failure_count += stats->LinkFailureCount;
	}
	fc_stats->fcp_input_megabytes = div_u64(fcp_in_bytes, 1000000);
	fc_stats->fcp_output_megabytes = div_u64(fcp_out_bytes, 1000000);
	fc_stats->lip_count = -1;
	fc_stats->nos_count = -1;
	fc_stats->loss_of_sync_count = -1;
	fc_stats->loss_of_signal_count = -1;
	fc_stats->prim_seq_protocol_err_count = -1;
	fc_stats->dumped_frames = -1;

	/* update exches stats */
	fc_exch_update_stats(lport);

	return fc_stats;
}
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EXPORT_SYMBOL(fc_get_host_stats);

/**
 * fc_lport_flogi_fill() - Fill in FLOGI command for request
 * @lport: The local port the FLOGI is for
 * @flogi: The FLOGI command
 * @op:    The opcode
 */


static void fc_lport_flogi_fill(struct fc_lport *lport,
				struct fc_els_flogi *flogi,
				unsigned int op)
{
	struct fc_els_csp *sp;
	struct fc_els_cssp *cp;

	memset(flogi, 0, sizeof(*flogi));
	flogi->fl_cmd = (u8) op;
	put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
	put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
	sp = &flogi->fl_csp;
	sp->sp_hi_ver = 0x20;
	sp->sp_lo_ver = 0x20;
	sp->sp_bb_cred = htons(10);	/* this gets set by gateway */
	sp->sp_bb_data = htons((u16) lport->mfs);
	cp = &flogi->fl_cssp[3 - 1];	/* class 3 parameters */
	cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
	if (op != ELS_FLOGI) {
		sp->sp_features = htons(FC_SP_FT_CIRO);
		sp->sp_tot_seq = htons(255);	/* seq. we accept */
		sp->sp_rel_off = htons(0x1f);
		sp->sp_e_d_tov = htonl(lport->e_d_tov);

		cp->cp_rdfs = htons((u16) lport->mfs);
		cp->cp_con_seq = htons(255);
		cp->cp_open_seq = 1;
	}
}

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/**
 * fc_lport_add_fc4_type() - Add a supported FC-4 type to a local port
 * @lport: The local port to add a new FC-4 type to
 * @type:  The new FC-4 type
 */


static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
{
	__be32 *mp;

	mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
	*mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
}

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/**
 * fc_lport_recv_rlir_req() - Handle received Registered Link Incident Report.
 * @lport: Fibre Channel local port receiving the RLIR
 * @fp:    The RLIR request frame
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this function.
 */


static void fc_lport_recv_rlir_req(struct fc_lport *lport, struct fc_frame *fp)
{
	FC_LPORT_DBG(lport, "Received RLIR request while in state %s\n",
		     fc_lport_state(lport));

	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
	fc_frame_free(fp);
}

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/**
 * fc_lport_recv_echo_req() - Handle received ECHO request
 * @lport: The local port receiving the ECHO
 * @fp:    ECHO request frame
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this function.
 */


static void fc_lport_recv_echo_req(struct fc_lport *lport,
				   struct fc_frame *in_fp)
{
	struct fc_frame *fp;
	unsigned int len;
	void *pp;
	void *dp;

	FC_LPORT_DBG(lport, "Received ECHO request while in state %s\n",
		     fc_lport_state(lport));

	len = fr_len(in_fp) - sizeof(struct fc_frame_header);
	pp = fc_frame_payload_get(in_fp, len);

	if (len < sizeof(__be32))
		len = sizeof(__be32);

	fp = fc_frame_alloc(lport, len);
	if (fp) {
		dp = fc_frame_payload_get(fp, len);
		memcpy(dp, pp, len);
		*((__be32 *)dp) = htonl(ELS_LS_ACC << 24);
		fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
		lport->tt.frame_send(lport, fp);
	}
	fc_frame_free(in_fp);
}

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/**
 * fc_lport_recv_rnid_req() - Handle received Request Node ID data request
 * @lport: The local port receiving the RNID
 * @fp:    The RNID request frame
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this function.
 */


static void fc_lport_recv_rnid_req(struct fc_lport *lport,
				   struct fc_frame *in_fp)
{
	struct fc_frame *fp;
	struct fc_els_rnid *req;
	struct {
		struct fc_els_rnid_resp rnid;
		struct fc_els_rnid_cid cid;
		struct fc_els_rnid_gen gen;
	} *rp;
	struct fc_seq_els_data rjt_data;
	u8 fmt;
	size_t len;

	FC_LPORT_DBG(lport, "Received RNID request while in state %s\n",
		     fc_lport_state(lport));

	req = fc_frame_payload_get(in_fp, sizeof(*req));
	if (!req) {
		rjt_data.reason = ELS_RJT_LOGIC;
		rjt_data.explan = ELS_EXPL_NONE;
		fc_seq_els_rsp_send(in_fp, ELS_LS_RJT, &rjt_data);
	} else {
		fmt = req->rnid_fmt;
		len = sizeof(*rp);
		if (fmt != ELS_RNIDF_GEN ||
		    ntohl(lport->rnid_gen.rnid_atype) == 0) {
			fmt = ELS_RNIDF_NONE;	/* nothing to provide */
			len -= sizeof(rp->gen);
		}
		fp = fc_frame_alloc(lport, len);
		if (fp) {
			rp = fc_frame_payload_get(fp, len);
			memset(rp, 0, len);
			rp->rnid.rnid_cmd = ELS_LS_ACC;
			rp->rnid.rnid_fmt = fmt;
			rp->rnid.rnid_cid_len = sizeof(rp->cid);
			rp->cid.rnid_wwpn = htonll(lport->wwpn);
			rp->cid.rnid_wwnn = htonll(lport->wwnn);
			if (fmt == ELS_RNIDF_GEN) {
				rp->rnid.rnid_sid_len = sizeof(rp->gen);
				memcpy(&rp->gen, &lport->rnid_gen,
				       sizeof(rp->gen));
			}
			fc_fill_reply_hdr(fp, in_fp, FC_RCTL_ELS_REP, 0);
			lport->tt.frame_send(lport, fp);
		}
	}
	fc_frame_free(in_fp);
}

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/**
 * fc_lport_recv_logo_req() - Handle received fabric LOGO request
 * @lport: The local port receiving the LOGO
 * @fp:    The LOGO request frame
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this function.
 */


static void fc_lport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp)
{
	fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
	fc_lport_enter_reset(lport);
	fc_frame_free(fp);
}

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/**
 * fc_fabric_login() - Start the lport state machine
 * @lport: The local port that should log into the fabric
 *
 * Locking Note: This function should not be called
 *               with the lport lock held.
 */


int fc_fabric_login(struct fc_lport *lport)
{
	int rc = -1;

	mutex_lock(&lport->lp_mutex);
	if (lport->state == LPORT_ST_DISABLED ||
	    lport->state == LPORT_ST_LOGO) {
		fc_lport_state_enter(lport, LPORT_ST_RESET);
		fc_lport_enter_reset(lport);
		rc = 0;
	}
	mutex_unlock(&lport->lp_mutex);

	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
53
79.10%
1
33.33%
Vasu Dev
13
19.40%
1
33.33%
Joe Eykholt
1
1.49%
1
33.33%
Total
67
100.00%
3
100.00%


EXPORT_SYMBOL(fc_fabric_login);

/**
 * __fc_linkup() - Handler for transport linkup events
 * @lport: The lport whose link is up
 *
 * Locking: must be called with the lp_mutex held
 */


void __fc_linkup(struct fc_lport *lport)
{
	if (!lport->link_up) {
		lport->link_up = 1;

		if (lport->state == LPORT_ST_RESET)
			fc_lport_enter_flogi(lport);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
31
81.58%
1
33.33%
Vasu Dev
5
13.16%
1
33.33%
Christopher Leech
2
5.26%
1
33.33%
Total
38
100.00%
3
100.00%

/**
 * fc_linkup() - Handler for transport linkup events
 * @lport: The local port whose link is up
 */


void fc_linkup(struct fc_lport *lport)
{
	printk(KERN_INFO "host%d: libfc: Link up on port (%6.6x)\n",
	       lport->host->host_no, lport->port_id);

	mutex_lock(&lport->lp_mutex);
	__fc_linkup(lport);
	mutex_unlock(&lport->lp_mutex);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christopher Leech
31
65.96%
2
40.00%
Robert Love
10
21.28%
2
40.00%
Joe Eykholt
6
12.77%
1
20.00%
Total
47
100.00%
5
100.00%


EXPORT_SYMBOL(fc_linkup);

/**
 * __fc_linkdown() - Handler for transport linkdown events
 * @lport: The lport whose link is down
 *
 * Locking: must be called with the lp_mutex held
 */


void __fc_linkdown(struct fc_lport *lport)
{
	if (lport->link_up) {
		lport->link_up = 0;
		fc_lport_enter_reset(lport);
		lport->tt.fcp_cleanup(lport);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
32
84.21%
1
33.33%
Vasu Dev
4
10.53%
1
33.33%
Christopher Leech
2
5.26%
1
33.33%
Total
38
100.00%
3
100.00%

/**
 * fc_linkdown() - Handler for transport linkdown events
 * @lport: The local port whose link is down
 */


void fc_linkdown(struct fc_lport *lport)
{
	printk(KERN_INFO "host%d: libfc: Link down on port (%6.6x)\n",
	       lport->host->host_no, lport->port_id);

	mutex_lock(&lport->lp_mutex);
	__fc_linkdown(lport);
	mutex_unlock(&lport->lp_mutex);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christopher Leech
31
65.96%
2
40.00%
Robert Love
10
21.28%
2
40.00%
Joe Eykholt
6
12.77%
1
20.00%
Total
47
100.00%
5
100.00%


EXPORT_SYMBOL(fc_linkdown);

/**
 * fc_fabric_logoff() - Logout of the fabric
 * @lport: The local port to logoff the fabric
 *
 * Return value:
 *      0 for success, -1 for failure
 */


int fc_fabric_logoff(struct fc_lport *lport)
{
	lport->tt.disc_stop_final(lport);
	mutex_lock(&lport->lp_mutex);
	if (lport->dns_rdata)
		fc_rport_logoff(lport->dns_rdata);
	mutex_unlock(&lport->lp_mutex);
	fc_rport_flush_queue();
	mutex_lock(&lport->lp_mutex);
	fc_lport_enter_logo(lport);
	mutex_unlock(&lport->lp_mutex);
	cancel_delayed_work_sync(&lport->retry_work);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
45
54.22%
2
33.33%
Abhijeet Joglekar
28
33.73%
1
16.67%
Steve Ma
8
9.64%
1
16.67%
Hannes Reinecke
2
2.41%
2
33.33%
Total
83
100.00%
6
100.00%


EXPORT_SYMBOL(fc_fabric_logoff);

/**
 * fc_lport_destroy() - Unregister a fc_lport
 * @lport: The local port to unregister
 *
 * Note:
 * exit routine for fc_lport instance
 * clean-up all the allocated memory
 * and free up other system resources.
 *
 */


int fc_lport_destroy(struct fc_lport *lport)
{
	mutex_lock(&lport->lp_mutex);
	lport->state = LPORT_ST_DISABLED;
	lport->link_up = 0;
	lport->tt.frame_send = fc_frame_drop;
	mutex_unlock(&lport->lp_mutex);

	lport->tt.fcp_abort_io(lport);
	lport->tt.disc_stop_final(lport);
	lport->tt.exch_mgr_reset(lport, 0, 0);
	cancel_delayed_work_sync(&lport->retry_work);
	fc_fc4_del_lport(lport);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
43
46.24%
1
16.67%
Abhijeet Joglekar
27
29.03%
1
16.67%
Joe Eykholt
15
16.13%
3
50.00%
Vasu Dev
8
8.60%
1
16.67%
Total
93
100.00%
6
100.00%


EXPORT_SYMBOL(fc_lport_destroy);

/**
 * fc_set_mfs() - Set the maximum frame size for a local port
 * @lport: The local port to set the MFS for
 * @mfs:   The new MFS
 */


int fc_set_mfs(struct fc_lport *lport, u32 mfs)
{
	unsigned int old_mfs;
	int rc = -EINVAL;

	mutex_lock(&lport->lp_mutex);

	old_mfs = lport->mfs;

	if (mfs >= FC_MIN_MAX_FRAME) {
		mfs &= ~3;
		if (mfs > FC_MAX_FRAME)
			mfs = FC_MAX_FRAME;
		mfs -= sizeof(struct fc_frame_header);
		lport->mfs = mfs;
		rc = 0;
	}

	if (!rc && mfs < old_mfs)
		fc_lport_enter_reset(lport);

	mutex_unlock(&lport->lp_mutex);

	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
103
100.00%
1
100.00%
Total
103
100.00%
1
100.00%


EXPORT_SYMBOL(fc_set_mfs);

/**
 * fc_lport_disc_callback() - Callback for discovery events
 * @lport: The local port receiving the event
 * @event: The discovery event
 */


static void fc_lport_disc_callback(struct fc_lport *lport,
				   enum fc_disc_event event)
{
	switch (event) {
	case DISC_EV_SUCCESS:
		FC_LPORT_DBG(lport, "Discovery succeeded\n");
		break;
	case DISC_EV_FAILED:
		printk(KERN_ERR "host%d: libfc: "
		       "Discovery failed for port (%6.6x)\n",
		       lport->host->host_no, lport->port_id);
		mutex_lock(&lport->lp_mutex);
		fc_lport_enter_reset(lport);
		mutex_unlock(&lport->lp_mutex);
		break;
	case DISC_EV_NONE:
		WARN_ON(1);
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
74
89.16%
3
50.00%
Joe Eykholt
7
8.43%
1
16.67%
Christopher Leech
1
1.20%
1
16.67%
Bart Van Assche
1
1.20%
1
16.67%
Total
83
100.00%
6
100.00%

/**
 * fc_rport_enter_ready() - Enter the ready state and start discovery
 * @lport: The local port that is ready
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this routine.
 */


static void fc_lport_enter_ready(struct fc_lport *lport)
{
	FC_LPORT_DBG(lport, "Entered READY from state %s\n",
		     fc_lport_state(lport));

	fc_lport_state_enter(lport, LPORT_ST_READY);
	if (lport->vport)
		fc_vport_set_state(lport->vport, FC_VPORT_ACTIVE);
	fc_vports_linkchange(lport);

	if (!lport->ptp_rdata)
		lport->tt.disc_start(fc_lport_disc_callback, lport);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Robert Love
42
61.76%
3
60.00%
Christopher Leech
20
29.41%
1
20.00%
Joe Eykholt
6
8.82%
1
20.00%
Total
68
100.00%
5
100.00%

/**
 * fc_lport_set_port_id() - set the local port Port ID
 * @lport: The local port which will have its Port ID set.
 * @port_id: The new port ID.
 * @fp: The frame containing the incoming request, or NULL.
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this function.
 */


static void fc_lport_set_port_id(struct fc_lport *lport, u32 port_id,
				 struct fc_frame *fp)
{
	if (port_id)
		printk(KERN_INFO "host%d: Assigned Port ID %6.6x\n",
		       lport->host->host_no, port_id);

	lport->port_id = port_id;

	/* Update the fc_host */
	fc_host_port_id(lport->host) = port_id;

	if (lport->tt.lport_set_port_id)
		lport->tt.lport_set_port_id(lport, port_id, fp);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joe Eykholt
66
89.19%
1
33.33%
Robert Love
7
9.46%
1
33.33%
Christopher Leech
1
1.35%
1
33.33%
Total
74
100.00%
3
100.00%

/**
 * fc_lport_set_port_id() - set the local port Port ID for point-to-multipoint
 * @lport: The local port which will have its Port ID set.
 * @port_id: The new port ID.
 *
 * Called by the lower-level driver when transport sets the local port_id.
 * This is used in VN_port to VN_port mode for FCoE, and causes FLOGI and
 * discovery to be skipped.
 */


void fc_lport_set_local_id(struct fc_lport *lport, u32 port_id)
{
	mutex_lock(&lport->lp_mutex);

	fc_lport_set_port_id(lport, port_id, NULL);

	switch (lport->state) {
	case LPORT_ST_RESET:
	case LPORT_ST_FLOGI:
		if (port_id)
			fc_lport_enter_ready(lport);
		break;
	default:
		break;
	}
	mutex_unlock(&lport->lp_mutex);
}
Contributors
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Joe Eykholt
64
100.00%
1
100.00%
Total
64
100.00%
1
100.00%


EXPORT_SYMBOL(fc_lport_set_local_id);

/**
 * fc_lport_recv_flogi_req() - Receive a FLOGI request
 * @lport: The local port that received the request
 * @rx_fp: The FLOGI frame
 *
 * A received FLOGI request indicates a point-to-point connection.
 * Accept it with the common service parameters indicating our N port.
 * Set up to do a PLOGI if we have the higher-number WWPN.
 *
 * Locking Note: The lport lock is expected to be held before calling
 * this function.
 */


static void fc_lport_recv_flogi_req(struct fc_lport *lport,
				    struct fc_frame *rx_fp)
{
	struct fc_frame *fp;
	struct fc_frame_header *fh;
	struct fc_els_flogi *flp;
	struct fc_els_flogi *new_flp;
	u64 remote_wwpn;
	u32 remote_fid;
	u32 local_fid;

	FC_LPORT_DBG(lport, "Received FLOGI request while in state %s\n",
		     fc_lport_state(lport));

	remote_fid = fc_frame_sid(rx_fp);
	flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
	if (!flp)
		goto out;
	remote_wwpn = get_unaligned_be64(&flp->fl_wwpn);
	if (remote_wwpn == lport->wwpn) {
		printk(KERN_WARNING "host%d: libfc: Received FLOGI from port "
		       "with same WWPN %16.16llx\n",
		       lport->host->host_no, remote_wwpn);
		goto out;
	}
	FC_LPORT_DBG(lport, "FLOGI from port WWPN %16.16llx\n", remote_wwpn);

	/*
         * XXX what is the right thing to do for FIDs?
         * The originator might expect our S_ID to be 0xfffffe.
         * But if so, both of us could end up with the same FID.
         */
	local_fid = FC_LOCAL_PTP_FID_LO;
	if (remote_wwpn < lport->wwpn) {
		local_fid = FC_LOCAL_PTP_FID_HI;
		if (!remote_fid || remote_fid == local_fid)
			remote_fid = FC_LOCAL_PTP_FID_LO;
	} else if (!remote_fid) {
		remote_fid = FC_LOCAL_PTP_FID_HI;
	}

	fc_lport_set_port_id(lport, local_fid, rx_fp);

	fp = fc_frame_alloc(lport, sizeof(*flp));
	if (fp) {
		new_flp = fc_frame_payload_get(fp, sizeof(