linux_dsm_epyc7002/drivers/scsi/bfa/bfa_fcs_fcpim.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2005-2014 Brocade Communications Systems, Inc.
 * Copyright (c) 2014- QLogic Corporation.
 * All rights reserved
 * www.qlogic.com
 *
 * Linux driver for QLogic BR-series Fibre Channel Host Bus Adapter.
 */

/*
 *  fcpim.c - FCP initiator mode i-t nexus state machine
 */

#include "bfad_drv.h"
#include "bfa_fcs.h"
#include "bfa_fcbuild.h"
#include "bfad_im.h"

BFA_TRC_FILE(FCS, FCPIM);

/*
 * forward declarations
 */
static void	bfa_fcs_itnim_timeout(void *arg);
static void	bfa_fcs_itnim_free(struct bfa_fcs_itnim_s *itnim);
static void	bfa_fcs_itnim_send_prli(void *itnim_cbarg,
					struct bfa_fcxp_s *fcxp_alloced);
static void	bfa_fcs_itnim_prli_response(void *fcsarg,
			 struct bfa_fcxp_s *fcxp, void *cbarg,
			    bfa_status_t req_status, u32 rsp_len,
			    u32 resid_len, struct fchs_s *rsp_fchs);
static void	bfa_fcs_itnim_aen_post(struct bfa_fcs_itnim_s *itnim,
			enum bfa_itnim_aen_event event);

static void	bfa_fcs_itnim_sm_offline(struct bfa_fcs_itnim_s *itnim,
					 enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_prli_send(struct bfa_fcs_itnim_s *itnim,
					   enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_prli(struct bfa_fcs_itnim_s *itnim,
				      enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_prli_retry(struct bfa_fcs_itnim_s *itnim,
					    enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_hcb_online(struct bfa_fcs_itnim_s *itnim,
					    enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_hal_rport_online(struct bfa_fcs_itnim_s *itnim,
					enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_online(struct bfa_fcs_itnim_s *itnim,
					enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_hcb_offline(struct bfa_fcs_itnim_s *itnim,
					     enum bfa_fcs_itnim_event event);
static void	bfa_fcs_itnim_sm_initiator(struct bfa_fcs_itnim_s *itnim,
					   enum bfa_fcs_itnim_event event);

static struct bfa_sm_table_s itnim_sm_table[] = {
	{BFA_SM(bfa_fcs_itnim_sm_offline), BFA_ITNIM_OFFLINE},
	{BFA_SM(bfa_fcs_itnim_sm_prli_send), BFA_ITNIM_PRLI_SEND},
	{BFA_SM(bfa_fcs_itnim_sm_prli), BFA_ITNIM_PRLI_SENT},
	{BFA_SM(bfa_fcs_itnim_sm_prli_retry), BFA_ITNIM_PRLI_RETRY},
	{BFA_SM(bfa_fcs_itnim_sm_hcb_online), BFA_ITNIM_HCB_ONLINE},
	{BFA_SM(bfa_fcs_itnim_sm_online), BFA_ITNIM_ONLINE},
	{BFA_SM(bfa_fcs_itnim_sm_hcb_offline), BFA_ITNIM_HCB_OFFLINE},
	{BFA_SM(bfa_fcs_itnim_sm_initiator), BFA_ITNIM_INITIATIOR},
};

/*
 *  fcs_itnim_sm FCS itnim state machine
 */

static void
bfa_fcs_itnim_sm_offline(struct bfa_fcs_itnim_s *itnim,
		 enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_FCS_ONLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_prli_send);
		itnim->prli_retries = 0;
		bfa_fcs_itnim_send_prli(itnim, NULL);
		break;

	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	case BFA_FCS_ITNIM_SM_INITIATOR:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_initiator);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}

}

static void
bfa_fcs_itnim_sm_prli_send(struct bfa_fcs_itnim_s *itnim,
		 enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_FRMSENT:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_prli);
		break;

	case BFA_FCS_ITNIM_SM_INITIATOR:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_initiator);
		bfa_fcxp_walloc_cancel(itnim->fcs->bfa, &itnim->fcxp_wqe);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_FCS_ONLINE);
		break;

	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcxp_walloc_cancel(itnim->fcs->bfa, &itnim->fcxp_wqe);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcxp_walloc_cancel(itnim->fcs->bfa, &itnim->fcxp_wqe);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_sm_prli(struct bfa_fcs_itnim_s *itnim,
		 enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_RSP_OK:
		if (itnim->rport->scsi_function == BFA_RPORT_INITIATOR)
			bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_initiator);
		else
			bfa_sm_set_state(itnim,
				bfa_fcs_itnim_sm_hal_rport_online);

		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_FCS_ONLINE);
		break;

	case BFA_FCS_ITNIM_SM_RSP_ERROR:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_prli_retry);
		bfa_timer_start(itnim->fcs->bfa, &itnim->timer,
				bfa_fcs_itnim_timeout, itnim,
				BFA_FCS_RETRY_TIMEOUT);
		break;

	case BFA_FCS_ITNIM_SM_RSP_NOT_SUPP:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		break;

	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcxp_discard(itnim->fcxp);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	case BFA_FCS_ITNIM_SM_INITIATOR:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_initiator);
		bfa_fcxp_discard(itnim->fcxp);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_FCS_ONLINE);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcxp_discard(itnim->fcxp);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_sm_hal_rport_online(struct bfa_fcs_itnim_s *itnim,
				enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_HAL_ONLINE:
		if (!itnim->bfa_itnim)
			itnim->bfa_itnim = bfa_itnim_create(itnim->fcs->bfa,
					itnim->rport->bfa_rport, itnim);

		if (itnim->bfa_itnim) {
			bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_hcb_online);
			bfa_itnim_online(itnim->bfa_itnim, itnim->seq_rec);
		} else {
			bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
			bfa_sm_send_event(itnim->rport, RPSM_EVENT_DELETE);
		}

		break;

	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_sm_prli_retry(struct bfa_fcs_itnim_s *itnim,
			    enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_TIMEOUT:
		if (itnim->prli_retries < BFA_FCS_RPORT_MAX_RETRIES) {
			itnim->prli_retries++;
			bfa_trc(itnim->fcs, itnim->prli_retries);
			bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_prli_send);
			bfa_fcs_itnim_send_prli(itnim, NULL);
		} else {
			/* invoke target offline */
			bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
			bfa_sm_send_event(itnim->rport, RPSM_EVENT_LOGO_IMP);
		}
		break;


	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_timer_stop(&itnim->timer);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	case BFA_FCS_ITNIM_SM_INITIATOR:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_initiator);
		bfa_timer_stop(&itnim->timer);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_FCS_ONLINE);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_timer_stop(&itnim->timer);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_sm_hcb_online(struct bfa_fcs_itnim_s *itnim,
			    enum bfa_fcs_itnim_event event)
{
	struct bfad_s *bfad = (struct bfad_s *)itnim->fcs->bfad;
	char	lpwwn_buf[BFA_STRING_32];
	char	rpwwn_buf[BFA_STRING_32];

	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_HCB_ONLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_online);
		bfa_fcb_itnim_online(itnim->itnim_drv);
		wwn2str(lpwwn_buf, bfa_fcs_lport_get_pwwn(itnim->rport->port));
		wwn2str(rpwwn_buf, itnim->rport->pwwn);
		BFA_LOG(KERN_INFO, bfad, bfa_log_level,
		"Target (WWN = %s) is online for initiator (WWN = %s)\n",
		rpwwn_buf, lpwwn_buf);
		bfa_fcs_itnim_aen_post(itnim, BFA_ITNIM_AEN_ONLINE);
		break;

	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_hcb_offline);
		bfa_itnim_offline(itnim->bfa_itnim);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_sm_online(struct bfa_fcs_itnim_s *itnim,
		 enum bfa_fcs_itnim_event event)
{
	struct bfad_s *bfad = (struct bfad_s *)itnim->fcs->bfad;
	char	lpwwn_buf[BFA_STRING_32];
	char	rpwwn_buf[BFA_STRING_32];

	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_hcb_offline);
		bfa_fcb_itnim_offline(itnim->itnim_drv);
		bfa_itnim_offline(itnim->bfa_itnim);
		wwn2str(lpwwn_buf, bfa_fcs_lport_get_pwwn(itnim->rport->port));
		wwn2str(rpwwn_buf, itnim->rport->pwwn);
		if (bfa_fcs_lport_is_online(itnim->rport->port) == BFA_TRUE) {
			BFA_LOG(KERN_ERR, bfad, bfa_log_level,
			"Target (WWN = %s) connectivity lost for "
			"initiator (WWN = %s)\n", rpwwn_buf, lpwwn_buf);
			bfa_fcs_itnim_aen_post(itnim, BFA_ITNIM_AEN_DISCONNECT);
		} else {
			BFA_LOG(KERN_INFO, bfad, bfa_log_level,
			"Target (WWN = %s) offlined by initiator (WWN = %s)\n",
			rpwwn_buf, lpwwn_buf);
			bfa_fcs_itnim_aen_post(itnim, BFA_ITNIM_AEN_OFFLINE);
		}
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_sm_hcb_offline(struct bfa_fcs_itnim_s *itnim,
			     enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_HCB_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

/*
 * This state is set when a discovered rport is also in intiator mode.
 * This ITN is marked as no_op and is not active and will not be truned into
 * online state.
 */
static void
bfa_fcs_itnim_sm_initiator(struct bfa_fcs_itnim_s *itnim,
		 enum bfa_fcs_itnim_event event)
{
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_trc(itnim->fcs, event);

	switch (event) {
	case BFA_FCS_ITNIM_SM_OFFLINE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_OFFLINE);
		break;

	/*
	 * fcs_online is expected here for well known initiator ports
	 */
	case BFA_FCS_ITNIM_SM_FCS_ONLINE:
		bfa_sm_send_event(itnim->rport, RPSM_EVENT_FC4_FCS_ONLINE);
		break;

	case BFA_FCS_ITNIM_SM_RSP_ERROR:
	case BFA_FCS_ITNIM_SM_INITIATOR:
		break;

	case BFA_FCS_ITNIM_SM_DELETE:
		bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);
		bfa_fcs_itnim_free(itnim);
		break;

	default:
		bfa_sm_fault(itnim->fcs, event);
	}
}

static void
bfa_fcs_itnim_aen_post(struct bfa_fcs_itnim_s *itnim,
			enum bfa_itnim_aen_event event)
{
	struct bfa_fcs_rport_s *rport = itnim->rport;
	struct bfad_s *bfad = (struct bfad_s *)itnim->fcs->bfad;
	struct bfa_aen_entry_s	*aen_entry;

	/* Don't post events for well known addresses */
	if (BFA_FCS_PID_IS_WKA(rport->pid))
		return;

	bfad_get_aen_entry(bfad, aen_entry);
	if (!aen_entry)
		return;

	aen_entry->aen_data.itnim.vf_id = rport->port->fabric->vf_id;
	aen_entry->aen_data.itnim.ppwwn = bfa_fcs_lport_get_pwwn(
					bfa_fcs_get_base_port(itnim->fcs));
	aen_entry->aen_data.itnim.lpwwn = bfa_fcs_lport_get_pwwn(rport->port);
	aen_entry->aen_data.itnim.rpwwn = rport->pwwn;

	/* Send the AEN notification */
	bfad_im_post_vendor_event(aen_entry, bfad, ++rport->fcs->fcs_aen_seq,
				  BFA_AEN_CAT_ITNIM, event);
}

static void
bfa_fcs_itnim_send_prli(void *itnim_cbarg, struct bfa_fcxp_s *fcxp_alloced)
{
	struct bfa_fcs_itnim_s *itnim = itnim_cbarg;
	struct bfa_fcs_rport_s *rport = itnim->rport;
	struct bfa_fcs_lport_s *port = rport->port;
	struct fchs_s	fchs;
	struct bfa_fcxp_s *fcxp;
	int		len;

	bfa_trc(itnim->fcs, itnim->rport->pwwn);

	fcxp = fcxp_alloced ? fcxp_alloced :
	       bfa_fcs_fcxp_alloc(port->fcs, BFA_TRUE);
	if (!fcxp) {
		itnim->stats.fcxp_alloc_wait++;
		bfa_fcs_fcxp_alloc_wait(port->fcs->bfa, &itnim->fcxp_wqe,
				bfa_fcs_itnim_send_prli, itnim, BFA_TRUE);
		return;
	}
	itnim->fcxp = fcxp;

	len = fc_prli_build(&fchs, bfa_fcxp_get_reqbuf(fcxp),
			    itnim->rport->pid, bfa_fcs_lport_get_fcid(port), 0);

	bfa_fcxp_send(fcxp, rport->bfa_rport, port->fabric->vf_id, port->lp_tag,
		      BFA_FALSE, FC_CLASS_3, len, &fchs,
		      bfa_fcs_itnim_prli_response, (void *)itnim,
		      FC_MAX_PDUSZ, FC_ELS_TOV);

	itnim->stats.prli_sent++;
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_FRMSENT);
}

static void
bfa_fcs_itnim_prli_response(void *fcsarg, struct bfa_fcxp_s *fcxp, void *cbarg,
			    bfa_status_t req_status, u32 rsp_len,
			    u32 resid_len, struct fchs_s *rsp_fchs)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) cbarg;
	struct fc_els_cmd_s *els_cmd;
	struct fc_prli_s *prli_resp;
	struct fc_ls_rjt_s *ls_rjt;
	struct fc_prli_params_s *sparams;

	bfa_trc(itnim->fcs, req_status);

	/*
	 * Sanity Checks
	 */
	if (req_status != BFA_STATUS_OK) {
		itnim->stats.prli_rsp_err++;
		bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_RSP_ERROR);
		return;
	}

	els_cmd = (struct fc_els_cmd_s *) BFA_FCXP_RSP_PLD(fcxp);

	if (els_cmd->els_code == FC_ELS_ACC) {
		prli_resp = (struct fc_prli_s *) els_cmd;

		if (fc_prli_rsp_parse(prli_resp, rsp_len) != FC_PARSE_OK) {
			bfa_trc(itnim->fcs, rsp_len);
			/*
			 * Check if this  r-port is also in Initiator mode.
			 * If so, we need to set this ITN as a no-op.
			 */
			if (prli_resp->parampage.servparams.initiator) {
				bfa_trc(itnim->fcs, prli_resp->parampage.type);
				itnim->rport->scsi_function =
						BFA_RPORT_INITIATOR;
				itnim->stats.prli_rsp_acc++;
				itnim->stats.initiator++;
				bfa_sm_send_event(itnim,
						  BFA_FCS_ITNIM_SM_RSP_OK);
				return;
			}

			itnim->stats.prli_rsp_parse_err++;
			return;
		}
		itnim->rport->scsi_function = BFA_RPORT_TARGET;

		sparams = &prli_resp->parampage.servparams;
		itnim->seq_rec	     = sparams->retry;
		itnim->rec_support   = sparams->rec_support;
		itnim->task_retry_id = sparams->task_retry_id;
		itnim->conf_comp     = sparams->confirm;

		itnim->stats.prli_rsp_acc++;
		bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_RSP_OK);
	} else {
		ls_rjt = (struct fc_ls_rjt_s *) BFA_FCXP_RSP_PLD(fcxp);

		bfa_trc(itnim->fcs, ls_rjt->reason_code);
		bfa_trc(itnim->fcs, ls_rjt->reason_code_expl);

		itnim->stats.prli_rsp_rjt++;
		if (ls_rjt->reason_code == FC_LS_RJT_RSN_CMD_NOT_SUPP) {
			bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_RSP_NOT_SUPP);
			return;
		}
		bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_RSP_ERROR);
	}
}

static void
bfa_fcs_itnim_timeout(void *arg)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) arg;

	itnim->stats.timeout++;
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_TIMEOUT);
}

static void
bfa_fcs_itnim_free(struct bfa_fcs_itnim_s *itnim)
{
	if (itnim->bfa_itnim) {
		bfa_itnim_delete(itnim->bfa_itnim);
		itnim->bfa_itnim = NULL;
	}

	bfa_fcb_itnim_free(itnim->fcs->bfad, itnim->itnim_drv);
}



/*
 *  itnim_public FCS ITNIM public interfaces
 */

/*
 *	Called by rport when a new rport is created.
 *
 * @param[in] rport	-  remote port.
 */
struct bfa_fcs_itnim_s *
bfa_fcs_itnim_create(struct bfa_fcs_rport_s *rport)
{
	struct bfa_fcs_lport_s *port = rport->port;
	struct bfa_fcs_itnim_s *itnim;
	struct bfad_itnim_s   *itnim_drv;
	int ret;

	/*
	 * call bfad to allocate the itnim
	 */
	ret = bfa_fcb_itnim_alloc(port->fcs->bfad, &itnim, &itnim_drv);
	if (ret) {
		bfa_trc(port->fcs, rport->pwwn);
		return NULL;
	}

	/*
	 * Initialize itnim
	 */
	itnim->rport = rport;
	itnim->fcs = rport->fcs;
	itnim->itnim_drv = itnim_drv;

	itnim->bfa_itnim     = NULL;
	itnim->seq_rec	     = BFA_FALSE;
	itnim->rec_support   = BFA_FALSE;
	itnim->conf_comp     = BFA_FALSE;
	itnim->task_retry_id = BFA_FALSE;

	/*
	 * Set State machine
	 */
	bfa_sm_set_state(itnim, bfa_fcs_itnim_sm_offline);

	return itnim;
}

/*
 *	Called by rport to delete  the instance of FCPIM.
 *
 * @param[in] rport	-  remote port.
 */
void
bfa_fcs_itnim_delete(struct bfa_fcs_itnim_s *itnim)
{
	bfa_trc(itnim->fcs, itnim->rport->pid);
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_DELETE);
}

/*
 * Notification from rport that PLOGI is complete to initiate FC-4 session.
 */
void
bfa_fcs_itnim_brp_online(struct bfa_fcs_itnim_s *itnim)
{
	itnim->stats.onlines++;

	if (!BFA_FCS_PID_IS_WKA(itnim->rport->pid))
		bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_HAL_ONLINE);
}

/*
 * Called by rport to handle a remote device offline.
 */
void
bfa_fcs_itnim_rport_offline(struct bfa_fcs_itnim_s *itnim)
{
	itnim->stats.offlines++;
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_OFFLINE);
}

/*
 * Called by rport when remote port is known to be an initiator from
 * PRLI received.
 */
void
bfa_fcs_itnim_is_initiator(struct bfa_fcs_itnim_s *itnim)
{
	bfa_trc(itnim->fcs, itnim->rport->pid);
	itnim->stats.initiator++;
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_INITIATOR);
}

/*
 * Called by rport to check if the itnim is online.
 */
bfa_status_t
bfa_fcs_itnim_get_online_state(struct bfa_fcs_itnim_s *itnim)
{
	bfa_trc(itnim->fcs, itnim->rport->pid);
	switch (bfa_sm_to_state(itnim_sm_table, itnim->sm)) {
	case BFA_ITNIM_ONLINE:
	case BFA_ITNIM_INITIATIOR:
		return BFA_STATUS_OK;

	default:
		return BFA_STATUS_NO_FCPIM_NEXUS;
	}
}

/*
 * BFA completion callback for bfa_itnim_online().
 */
void
bfa_cb_itnim_online(void *cbarg)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) cbarg;

	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_HCB_ONLINE);
}

/*
 * BFA completion callback for bfa_itnim_offline().
 */
void
bfa_cb_itnim_offline(void *cb_arg)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) cb_arg;

	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_sm_send_event(itnim, BFA_FCS_ITNIM_SM_HCB_OFFLINE);
}

/*
 * Mark the beginning of PATH TOV handling. IO completion callbacks
 * are still pending.
 */
void
bfa_cb_itnim_tov_begin(void *cb_arg)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) cb_arg;

	bfa_trc(itnim->fcs, itnim->rport->pwwn);
}

/*
 * Mark the end of PATH TOV handling. All pending IOs are already cleaned up.
 */
void
bfa_cb_itnim_tov(void *cb_arg)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) cb_arg;
	struct bfad_itnim_s *itnim_drv = itnim->itnim_drv;

	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	itnim_drv->state = ITNIM_STATE_TIMEOUT;
}

/*
 *		BFA notification to FCS/driver for second level error recovery.
 *
 * Atleast one I/O request has timedout and target is unresponsive to
 * repeated abort requests. Second level error recovery should be initiated
 * by starting implicit logout and recovery procedures.
 */
void
bfa_cb_itnim_sler(void *cb_arg)
{
	struct bfa_fcs_itnim_s *itnim = (struct bfa_fcs_itnim_s *) cb_arg;

	itnim->stats.sler++;
	bfa_trc(itnim->fcs, itnim->rport->pwwn);
	bfa_sm_send_event(itnim->rport, RPSM_EVENT_LOGO_IMP);
}

struct bfa_fcs_itnim_s *
bfa_fcs_itnim_lookup(struct bfa_fcs_lport_s *port, wwn_t rpwwn)
{
	struct bfa_fcs_rport_s *rport;
	rport = bfa_fcs_rport_lookup(port, rpwwn);

	if (!rport)
		return NULL;

	WARN_ON(rport->itnim == NULL);
	return rport->itnim;
}

bfa_status_t
bfa_fcs_itnim_attr_get(struct bfa_fcs_lport_s *port, wwn_t rpwwn,
		       struct bfa_itnim_attr_s *attr)
{
	struct bfa_fcs_itnim_s *itnim = NULL;

	itnim = bfa_fcs_itnim_lookup(port, rpwwn);

	if (itnim == NULL)
		return BFA_STATUS_NO_FCPIM_NEXUS;

	attr->state	    = bfa_sm_to_state(itnim_sm_table, itnim->sm);
	attr->retry	    = itnim->seq_rec;
	attr->rec_support   = itnim->rec_support;
	attr->conf_comp	    = itnim->conf_comp;
	attr->task_retry_id = itnim->task_retry_id;
	return BFA_STATUS_OK;
}

bfa_status_t
bfa_fcs_itnim_stats_get(struct bfa_fcs_lport_s *port, wwn_t rpwwn,
			struct bfa_itnim_stats_s *stats)
{
	struct bfa_fcs_itnim_s *itnim = NULL;

	WARN_ON(port == NULL);

	itnim = bfa_fcs_itnim_lookup(port, rpwwn);

	if (itnim == NULL)
		return BFA_STATUS_NO_FCPIM_NEXUS;

	memcpy(stats, &itnim->stats, sizeof(struct bfa_itnim_stats_s));

	return BFA_STATUS_OK;
}

bfa_status_t
bfa_fcs_itnim_stats_clear(struct bfa_fcs_lport_s *port, wwn_t rpwwn)
{
	struct bfa_fcs_itnim_s *itnim = NULL;

	WARN_ON(port == NULL);

	itnim = bfa_fcs_itnim_lookup(port, rpwwn);

	if (itnim == NULL)
		return BFA_STATUS_NO_FCPIM_NEXUS;

	memset(&itnim->stats, 0, sizeof(struct bfa_itnim_stats_s));
	return BFA_STATUS_OK;
}

void
bfa_fcs_fcpim_uf_recv(struct bfa_fcs_itnim_s *itnim,
			struct fchs_s *fchs, u16 len)
{
	struct fc_els_cmd_s *els_cmd;

	bfa_trc(itnim->fcs, fchs->type);

	if (fchs->type != FC_TYPE_ELS)
		return;

	els_cmd = (struct fc_els_cmd_s *) (fchs + 1);

	bfa_trc(itnim->fcs, els_cmd->els_code);

	switch (els_cmd->els_code) {
	case FC_ELS_PRLO:
		bfa_fcs_rport_prlo(itnim->rport, fchs->ox_id);
		break;

	default:
		WARN_ON(1);
	}
}