// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term
 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
 */

/*
 * Functions to build and send ELS/CT/BLS commands and responses.
 */

#include "efc.h"
#include "efc_els.h"
#include "../libefc_sli/sli4.h"

#define EFC_LOG_ENABLE_ELS_TRACE(efc)           \
                (((efc) != NULL) ? (((efc)->logmask & (1U << 1)) != 0) : 0)

#define node_els_trace()  \
        do { \
                if (EFC_LOG_ENABLE_ELS_TRACE(efc)) \
                        efc_log_info(efc, "[%s] %-20s\n", \
                                node->display_name, __func__); \
        } while (0)

#define els_io_printf(els, fmt, ...) \
        efc_log_err((struct efc *)els->node->efc,\
                      "[%s] %-8s " fmt, \
                      els->node->display_name,\
                      els->display_name, ##__VA_ARGS__)

#define EFC_ELS_RSP_LEN                 1024
#define EFC_ELS_GID_PT_RSP_LEN          8096

struct efc_els_io_req *
efc_els_io_alloc(struct efc_node *node, u32 reqlen)
{
        return efc_els_io_alloc_size(node, reqlen, EFC_ELS_RSP_LEN);
}

struct efc_els_io_req *
efc_els_io_alloc_size(struct efc_node *node, u32 reqlen, u32 rsplen)
{
        struct efc *efc;
        struct efc_els_io_req *els;
        unsigned long flags = 0;

        efc = node->efc;

        if (!node->els_io_enabled) {
                efc_log_err(efc, "els io alloc disabled\n");
                return NULL;
        }

        els = mempool_alloc(efc->els_io_pool, GFP_ATOMIC);
        if (!els) {
                atomic_add_return(1, &efc->els_io_alloc_failed_count);
                return NULL;
        }

        /* initialize refcount */
        kref_init(&els->ref);
        els->release = _efc_els_io_free;

        /* populate generic io fields */
        els->node = node;

        /* now allocate DMA for request and response */
        els->io.req.size = reqlen;
        els->io.req.virt = dma_alloc_coherent(&efc->pci->dev, els->io.req.size,
                                              &els->io.req.phys, GFP_KERNEL);
        if (!els->io.req.virt) {
                mempool_free(els, efc->els_io_pool);
                return NULL;
        }

        els->io.rsp.size = rsplen;
        els->io.rsp.virt = dma_alloc_coherent(&efc->pci->dev, els->io.rsp.size,
                                              &els->io.rsp.phys, GFP_KERNEL);
        if (!els->io.rsp.virt) {
                dma_free_coherent(&efc->pci->dev, els->io.req.size,
                                  els->io.req.virt, els->io.req.phys);
                mempool_free(els, efc->els_io_pool);
                els = NULL;
        }

        if (els) {
                /* initialize fields */
                els->els_retries_remaining = EFC_FC_ELS_DEFAULT_RETRIES;

                /* add els structure to ELS IO list */
                INIT_LIST_HEAD(&els->list_entry);
                spin_lock_irqsave(&node->els_ios_lock, flags);
                list_add_tail(&els->list_entry, &node->els_ios_list);
                spin_unlock_irqrestore(&node->els_ios_lock, flags);
        }

        return els;
}

void
efc_els_io_free(struct efc_els_io_req *els)
{
        kref_put(&els->ref, els->release);
}

void
_efc_els_io_free(struct kref *arg)
{
        struct efc_els_io_req *els =
                                container_of(arg, struct efc_els_io_req, ref);
        struct efc *efc;
        struct efc_node *node;
        int send_empty_event = false;
        unsigned long flags = 0;

        node = els->node;
        efc = node->efc;

        spin_lock_irqsave(&node->els_ios_lock, flags);

        list_del(&els->list_entry);
        /* Send list empty event if the IO allocator
         * is disabled, and the list is empty
         * If node->els_io_enabled was not checked,
         * the event would be posted continually
         */
        send_empty_event = (!node->els_io_enabled &&
                           list_empty(&node->els_ios_list));

        spin_unlock_irqrestore(&node->els_ios_lock, flags);

        /* free ELS request and response buffers */
        dma_free_coherent(&efc->pci->dev, els->io.rsp.size,
                          els->io.rsp.virt, els->io.rsp.phys);
        dma_free_coherent(&efc->pci->dev, els->io.req.size,
                          els->io.req.virt, els->io.req.phys);

        mempool_free(els, efc->els_io_pool);

        if (send_empty_event)
                efc_scsi_io_list_empty(node->efc, node);
}

static void
efc_els_retry(struct efc_els_io_req *els);

static void
efc_els_delay_timer_cb(struct timer_list *t)
{
        struct efc_els_io_req *els = timer_container_of(els, t, delay_timer);

        /* Retry delay timer expired, retry the ELS request */
        efc_els_retry(els);
}

static int
efc_els_req_cb(void *arg, u32 length, int status, u32 ext_status)
{
        struct efc_els_io_req *els;
        struct efc_node *node;
        struct efc *efc;
        struct efc_node_cb cbdata;
        u32 reason_code;

        els = arg;
        node = els->node;
        efc = node->efc;

        if (status)
                els_io_printf(els, "status x%x ext x%x\n", status, ext_status);

        /* set the response len element of els->rsp */
        els->io.rsp.len = length;

        cbdata.status = status;
        cbdata.ext_status = ext_status;
        cbdata.header = NULL;
        cbdata.els_rsp = els->io.rsp;

        /* set the response len element of els->rsp */
        cbdata.rsp_len = length;

        /* FW returns the number of bytes received on the link in
         * the WCQE, not the amount placed in the buffer; use this info to
         * check if there was an overrun.
         */
        if (length > els->io.rsp.size) {
                efc_log_warn(efc,
                             "ELS response returned len=%d > buflen=%zu\n",
                             length, els->io.rsp.size);
                efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_FAIL, &cbdata);
                return 0;
        }

        /* Post event to ELS IO object */
        switch (status) {
        case SLI4_FC_WCQE_STATUS_SUCCESS:
                efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_OK, &cbdata);
                break;

        case SLI4_FC_WCQE_STATUS_LS_RJT:
                reason_code = (ext_status >> 16) & 0xff;

                /* delay and retry if reason code is Logical Busy */
                switch (reason_code) {
                case ELS_RJT_BUSY:
                        els->node->els_req_cnt--;
                        els_io_printf(els,
                                      "LS_RJT Logical Busy, delay and retry\n");
                        timer_setup(&els->delay_timer,
                                    efc_els_delay_timer_cb, 0);
                        mod_timer(&els->delay_timer,
                                  jiffies + msecs_to_jiffies(5000));
                        break;
                default:
                        efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_RJT,
                                           &cbdata);
                        break;
                }
                break;

        case SLI4_FC_WCQE_STATUS_LOCAL_REJECT:
                switch (ext_status) {
                case SLI4_FC_LOCAL_REJECT_SEQUENCE_TIMEOUT:
                        efc_els_retry(els);
                        break;
                default:
                        efc_log_err(efc, "LOCAL_REJECT with ext status:%x\n",
                                    ext_status);
                        efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_FAIL,
                                           &cbdata);
                        break;
                }
                break;
        default:        /* Other error */
                efc_log_warn(efc, "els req failed status x%x, ext_status x%x\n",
                             status, ext_status);
                efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_FAIL, &cbdata);
                break;
        }

        return 0;
}

void efc_disc_io_complete(struct efc_disc_io *io, u32 len, u32 status,
                          u32 ext_status)
{
        struct efc_els_io_req *els =
                                container_of(io, struct efc_els_io_req, io);

        WARN_ON_ONCE(!els->cb);

        ((efc_hw_srrs_cb_t)els->cb) (els, len, status, ext_status);
}

static int efc_els_send_req(struct efc_node *node, struct efc_els_io_req *els,
                            enum efc_disc_io_type io_type)
{
        int rc = 0;
        struct efc *efc = node->efc;
        struct efc_node_cb cbdata;

        /* update ELS request counter */
        els->node->els_req_cnt++;

        /* Prepare the IO request details */
        els->io.io_type = io_type;
        els->io.xmit_len = els->io.req.size;
        els->io.rsp_len = els->io.rsp.size;
        els->io.rpi = node->rnode.indicator;
        els->io.vpi = node->nport->indicator;
        els->io.s_id = node->nport->fc_id;
        els->io.d_id = node->rnode.fc_id;

        if (node->rnode.attached)
                els->io.rpi_registered = true;

        els->cb = efc_els_req_cb;

        rc = efc->tt.send_els(efc, &els->io);
        if (!rc)
                return rc;

        cbdata.status = EFC_STATUS_INVALID;
        cbdata.ext_status = EFC_STATUS_INVALID;
        cbdata.els_rsp = els->io.rsp;
        efc_log_err(efc, "efc_els_send failed: %d\n", rc);
        efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_FAIL, &cbdata);

        return rc;
}

static void
efc_els_retry(struct efc_els_io_req *els)
{
        struct efc *efc;
        struct efc_node_cb cbdata;
        u32 rc;

        efc = els->node->efc;
        cbdata.status = EFC_STATUS_INVALID;
        cbdata.ext_status = EFC_STATUS_INVALID;
        cbdata.els_rsp = els->io.rsp;

        if (els->els_retries_remaining) {
                els->els_retries_remaining--;
                rc = efc->tt.send_els(efc, &els->io);
        } else {
                rc = -EIO;
        }

        if (rc) {
                efc_log_err(efc, "ELS retries exhausted\n");
                efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_REQ_FAIL, &cbdata);
        }
}

static int
efc_els_acc_cb(void *arg, u32 length, int status, u32 ext_status)
{
        struct efc_els_io_req *els;
        struct efc_node *node;
        struct efc *efc;
        struct efc_node_cb cbdata;

        els = arg;
        node = els->node;
        efc = node->efc;

        cbdata.status = status;
        cbdata.ext_status = ext_status;
        cbdata.header = NULL;
        cbdata.els_rsp = els->io.rsp;

        /* Post node event */
        switch (status) {
        case SLI4_FC_WCQE_STATUS_SUCCESS:
                efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_CMPL_OK, &cbdata);
                break;

        default:        /* Other error */
                efc_log_warn(efc, "[%s] %-8s failed status x%x, ext x%x\n",
                             node->display_name, els->display_name,
                             status, ext_status);
                efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_CMPL_FAIL, &cbdata);
                break;
        }

        return 0;
}

static int
efc_els_send_rsp(struct efc_els_io_req *els, u32 rsplen)
{
        int rc = 0;
        struct efc_node_cb cbdata;
        struct efc_node *node = els->node;
        struct efc *efc = node->efc;

        /* increment ELS completion counter */
        node->els_cmpl_cnt++;

        els->io.io_type = EFC_DISC_IO_ELS_RESP;
        els->cb = efc_els_acc_cb;

        /* Prepare the IO request details */
        els->io.xmit_len = rsplen;
        els->io.rsp_len = els->io.rsp.size;
        els->io.rpi = node->rnode.indicator;
        els->io.vpi = node->nport->indicator;
        if (node->nport->fc_id != U32_MAX)
                els->io.s_id = node->nport->fc_id;
        else
                els->io.s_id = els->io.iparam.els.s_id;
        els->io.d_id = node->rnode.fc_id;

        if (node->attached)
                els->io.rpi_registered = true;

        rc = efc->tt.send_els(efc, &els->io);
        if (!rc)
                return rc;

        cbdata.status = EFC_STATUS_INVALID;
        cbdata.ext_status = EFC_STATUS_INVALID;
        cbdata.els_rsp = els->io.rsp;
        efc_els_io_cleanup(els, EFC_EVT_SRRS_ELS_CMPL_FAIL, &cbdata);

        return rc;
}

int
efc_send_plogi(struct efc_node *node)
{
        struct efc_els_io_req *els;
        struct efc *efc = node->efc;
        struct fc_els_flogi  *plogi;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*plogi));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }
        els->display_name = "plogi";

        /* Build PLOGI request */
        plogi = els->io.req.virt;

        memcpy(plogi, node->nport->service_params, sizeof(*plogi));

        plogi->fl_cmd = ELS_PLOGI;
        memset(plogi->_fl_resvd, 0, sizeof(plogi->_fl_resvd));

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_flogi(struct efc_node *node)
{
        struct efc_els_io_req *els;
        struct efc *efc;
        struct fc_els_flogi  *flogi;

        efc = node->efc;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*flogi));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "flogi";

        /* Build FLOGI request */
        flogi = els->io.req.virt;

        memcpy(flogi, node->nport->service_params, sizeof(*flogi));
        flogi->fl_cmd = ELS_FLOGI;
        memset(flogi->_fl_resvd, 0, sizeof(flogi->_fl_resvd));

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_fdisc(struct efc_node *node)
{
        struct efc_els_io_req *els;
        struct efc *efc;
        struct fc_els_flogi *fdisc;

        efc = node->efc;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*fdisc));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "fdisc";

        /* Build FDISC request */
        fdisc = els->io.req.virt;

        memcpy(fdisc, node->nport->service_params, sizeof(*fdisc));
        fdisc->fl_cmd = ELS_FDISC;
        memset(fdisc->_fl_resvd, 0, sizeof(fdisc->_fl_resvd));

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_prli(struct efc_node *node)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els;
        struct {
                struct fc_els_prli prli;
                struct fc_els_spp spp;
        } *pp;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*pp));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "prli";

        /* Build PRLI request */
        pp = els->io.req.virt;

        memset(pp, 0, sizeof(*pp));

        pp->prli.prli_cmd = ELS_PRLI;
        pp->prli.prli_spp_len = 16;
        pp->prli.prli_len = cpu_to_be16(sizeof(*pp));
        pp->spp.spp_type = FC_TYPE_FCP;
        pp->spp.spp_type_ext = 0;
        pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR;
        pp->spp.spp_params = cpu_to_be32(FCP_SPPF_RD_XRDY_DIS |
                               (node->nport->enable_ini ?
                               FCP_SPPF_INIT_FCN : 0) |
                               (node->nport->enable_tgt ?
                               FCP_SPPF_TARG_FCN : 0));

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_logo(struct efc_node *node)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els;
        struct fc_els_logo *logo;
        struct fc_els_flogi  *sparams;

        node_els_trace();

        sparams = (struct fc_els_flogi *)node->nport->service_params;

        els = efc_els_io_alloc(node, sizeof(*logo));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "logo";

        /* Build LOGO request */

        logo = els->io.req.virt;

        memset(logo, 0, sizeof(*logo));
        logo->fl_cmd = ELS_LOGO;
        hton24(logo->fl_n_port_id, node->rnode.nport->fc_id);
        logo->fl_n_port_wwn = sparams->fl_wwpn;

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_adisc(struct efc_node *node)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els;
        struct fc_els_adisc *adisc;
        struct fc_els_flogi  *sparams;
        struct efc_nport *nport = node->nport;

        node_els_trace();

        sparams = (struct fc_els_flogi *)node->nport->service_params;

        els = efc_els_io_alloc(node, sizeof(*adisc));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "adisc";

        /* Build ADISC request */

        adisc = els->io.req.virt;

        memset(adisc, 0, sizeof(*adisc));
        adisc->adisc_cmd = ELS_ADISC;
        hton24(adisc->adisc_hard_addr, nport->fc_id);
        adisc->adisc_wwpn = sparams->fl_wwpn;
        adisc->adisc_wwnn = sparams->fl_wwnn;
        hton24(adisc->adisc_port_id, node->rnode.nport->fc_id);

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_scr(struct efc_node *node)
{
        struct efc_els_io_req *els;
        struct efc *efc = node->efc;
        struct fc_els_scr *req;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*req));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "scr";

        req = els->io.req.virt;

        memset(req, 0, sizeof(*req));
        req->scr_cmd = ELS_SCR;
        req->scr_reg_func = ELS_SCRF_FULL;

        return efc_els_send_req(node, els, EFC_DISC_IO_ELS_REQ);
}

int
efc_send_ls_rjt(struct efc_node *node, u32 ox_id, u32 reason_code,
                u32 reason_code_expl, u32 vendor_unique)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct fc_els_ls_rjt *rjt;

        els = efc_els_io_alloc(node, sizeof(*rjt));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        node_els_trace();

        els->display_name = "ls_rjt";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        rjt = els->io.req.virt;
        memset(rjt, 0, sizeof(*rjt));

        rjt->er_cmd = ELS_LS_RJT;
        rjt->er_reason = reason_code;
        rjt->er_explan = reason_code_expl;

        return efc_els_send_rsp(els, sizeof(*rjt));
}

int
efc_send_plogi_acc(struct efc_node *node, u32 ox_id)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct fc_els_flogi  *plogi;
        struct fc_els_flogi  *req = (struct fc_els_flogi *)node->service_params;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*plogi));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "plogi_acc";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        plogi = els->io.req.virt;

        /* copy our port's service parameters to payload */
        memcpy(plogi, node->nport->service_params, sizeof(*plogi));
        plogi->fl_cmd = ELS_LS_ACC;
        memset(plogi->_fl_resvd, 0, sizeof(plogi->_fl_resvd));

        /* Set Application header support bit if requested */
        if (req->fl_csp.sp_features & cpu_to_be16(FC_SP_FT_BCAST))
                plogi->fl_csp.sp_features |= cpu_to_be16(FC_SP_FT_BCAST);

        return efc_els_send_rsp(els, sizeof(*plogi));
}

int
efc_send_flogi_p2p_acc(struct efc_node *node, u32 ox_id, u32 s_id)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct fc_els_flogi  *flogi;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*flogi));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "flogi_p2p_acc";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;
        els->io.iparam.els.s_id = s_id;

        flogi = els->io.req.virt;

        /* copy our port's service parameters to payload */
        memcpy(flogi, node->nport->service_params, sizeof(*flogi));
        flogi->fl_cmd = ELS_LS_ACC;
        memset(flogi->_fl_resvd, 0, sizeof(flogi->_fl_resvd));

        memset(flogi->fl_cssp, 0, sizeof(flogi->fl_cssp));

        return efc_els_send_rsp(els, sizeof(*flogi));
}

int
efc_send_prli_acc(struct efc_node *node, u32 ox_id)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct {
                struct fc_els_prli prli;
                struct fc_els_spp spp;
        } *pp;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*pp));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "prli_acc";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        pp = els->io.req.virt;
        memset(pp, 0, sizeof(*pp));

        pp->prli.prli_cmd = ELS_LS_ACC;
        pp->prli.prli_spp_len = 0x10;
        pp->prli.prli_len = cpu_to_be16(sizeof(*pp));
        pp->spp.spp_type = FC_TYPE_FCP;
        pp->spp.spp_type_ext = 0;
        pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR | FC_SPP_RESP_ACK;

        pp->spp.spp_params = cpu_to_be32(FCP_SPPF_RD_XRDY_DIS |
                                        (node->nport->enable_ini ?
                                         FCP_SPPF_INIT_FCN : 0) |
                                        (node->nport->enable_tgt ?
                                         FCP_SPPF_TARG_FCN : 0));

        return efc_els_send_rsp(els, sizeof(*pp));
}

int
efc_send_prlo_acc(struct efc_node *node, u32 ox_id)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct {
                struct fc_els_prlo prlo;
                struct fc_els_spp spp;
        } *pp;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*pp));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "prlo_acc";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        pp = els->io.req.virt;
        memset(pp, 0, sizeof(*pp));
        pp->prlo.prlo_cmd = ELS_LS_ACC;
        pp->prlo.prlo_obs = 0x10;
        pp->prlo.prlo_len = cpu_to_be16(sizeof(*pp));

        pp->spp.spp_type = FC_TYPE_FCP;
        pp->spp.spp_type_ext = 0;
        pp->spp.spp_flags = FC_SPP_RESP_ACK;

        return efc_els_send_rsp(els, sizeof(*pp));
}

int
efc_send_ls_acc(struct efc_node *node, u32 ox_id)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct fc_els_ls_acc *acc;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*acc));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "ls_acc";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        acc = els->io.req.virt;
        memset(acc, 0, sizeof(*acc));

        acc->la_cmd = ELS_LS_ACC;

        return efc_els_send_rsp(els, sizeof(*acc));
}

int
efc_send_logo_acc(struct efc_node *node, u32 ox_id)
{
        struct efc_els_io_req *els = NULL;
        struct efc *efc = node->efc;
        struct fc_els_ls_acc *logo;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*logo));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "logo_acc";

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        logo = els->io.req.virt;
        memset(logo, 0, sizeof(*logo));

        logo->la_cmd = ELS_LS_ACC;

        return efc_els_send_rsp(els, sizeof(*logo));
}

int
efc_send_adisc_acc(struct efc_node *node, u32 ox_id)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els = NULL;
        struct fc_els_adisc *adisc;
        struct fc_els_flogi  *sparams;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*adisc));
        if (!els) {
                efc_log_err(efc, "els IO alloc failed\n");
                return -EIO;
        }

        els->display_name = "adisc_acc";

        /* Go ahead and send the ELS_ACC */
        memset(&els->io.iparam, 0, sizeof(els->io.iparam));
        els->io.iparam.els.ox_id = ox_id;

        sparams = (struct fc_els_flogi  *)node->nport->service_params;
        adisc = els->io.req.virt;
        memset(adisc, 0, sizeof(*adisc));
        adisc->adisc_cmd = ELS_LS_ACC;
        adisc->adisc_wwpn = sparams->fl_wwpn;
        adisc->adisc_wwnn = sparams->fl_wwnn;
        hton24(adisc->adisc_port_id, node->rnode.nport->fc_id);

        return efc_els_send_rsp(els, sizeof(*adisc));
}

static inline void
fcct_build_req_header(struct fc_ct_hdr  *hdr, u16 cmd, u16 max_size)
{
        hdr->ct_rev = FC_CT_REV;
        hdr->ct_fs_type = FC_FST_DIR;
        hdr->ct_fs_subtype = FC_NS_SUBTYPE;
        hdr->ct_options = 0;
        hdr->ct_cmd = cpu_to_be16(cmd);
        /* words */
        hdr->ct_mr_size = cpu_to_be16(max_size / (sizeof(u32)));
        hdr->ct_reason = 0;
        hdr->ct_explan = 0;
        hdr->ct_vendor = 0;
}

int
efc_ns_send_rftid(struct efc_node *node)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els;
        struct {
                struct fc_ct_hdr hdr;
                struct fc_ns_rft_id rftid;
        } *ct;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*ct));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->io.iparam.ct.r_ctl = FC_RCTL_ELS_REQ;
        els->io.iparam.ct.type = FC_TYPE_CT;
        els->io.iparam.ct.df_ctl = 0;
        els->io.iparam.ct.timeout = EFC_FC_ELS_SEND_DEFAULT_TIMEOUT;

        els->display_name = "rftid";

        ct = els->io.req.virt;
        memset(ct, 0, sizeof(*ct));
        fcct_build_req_header(&ct->hdr, FC_NS_RFT_ID,
                              sizeof(struct fc_ns_rft_id));

        hton24(ct->rftid.fr_fid.fp_fid, node->rnode.nport->fc_id);
        ct->rftid.fr_fts.ff_type_map[FC_TYPE_FCP / FC_NS_BPW] =
                cpu_to_be32(1 << (FC_TYPE_FCP % FC_NS_BPW));

        return efc_els_send_req(node, els, EFC_DISC_IO_CT_REQ);
}

int
efc_ns_send_rffid(struct efc_node *node)
{
        struct efc *efc = node->efc;
        struct efc_els_io_req *els;
        struct {
                struct fc_ct_hdr hdr;
                struct fc_ns_rff_id rffid;
        } *ct;

        node_els_trace();

        els = efc_els_io_alloc(node, sizeof(*ct));
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->io.iparam.ct.r_ctl = FC_RCTL_ELS_REQ;
        els->io.iparam.ct.type = FC_TYPE_CT;
        els->io.iparam.ct.df_ctl = 0;
        els->io.iparam.ct.timeout = EFC_FC_ELS_SEND_DEFAULT_TIMEOUT;

        els->display_name = "rffid";
        ct = els->io.req.virt;

        memset(ct, 0, sizeof(*ct));
        fcct_build_req_header(&ct->hdr, FC_NS_RFF_ID,
                              sizeof(struct fc_ns_rff_id));

        hton24(ct->rffid.fr_fid.fp_fid, node->rnode.nport->fc_id);
        if (node->nport->enable_ini)
                ct->rffid.fr_feat |= FCP_FEAT_INIT;
        if (node->nport->enable_tgt)
                ct->rffid.fr_feat |= FCP_FEAT_TARG;
        ct->rffid.fr_type = FC_TYPE_FCP;

        return efc_els_send_req(node, els, EFC_DISC_IO_CT_REQ);
}

int
efc_ns_send_gidpt(struct efc_node *node)
{
        struct efc_els_io_req *els = NULL;
        struct efc *efc = node->efc;
        struct {
                struct fc_ct_hdr hdr;
                struct fc_ns_gid_pt gidpt;
        } *ct;

        node_els_trace();

        els = efc_els_io_alloc_size(node, sizeof(*ct), EFC_ELS_GID_PT_RSP_LEN);
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        els->io.iparam.ct.r_ctl = FC_RCTL_ELS_REQ;
        els->io.iparam.ct.type = FC_TYPE_CT;
        els->io.iparam.ct.df_ctl = 0;
        els->io.iparam.ct.timeout = EFC_FC_ELS_SEND_DEFAULT_TIMEOUT;

        els->display_name = "gidpt";

        ct = els->io.req.virt;

        memset(ct, 0, sizeof(*ct));
        fcct_build_req_header(&ct->hdr, FC_NS_GID_PT,
                              sizeof(struct fc_ns_gid_pt));

        ct->gidpt.fn_pt_type = FC_TYPE_FCP;

        return efc_els_send_req(node, els, EFC_DISC_IO_CT_REQ);
}

void
efc_els_io_cleanup(struct efc_els_io_req *els, int evt, void *arg)
{
        /* don't want further events that could come; e.g. abort requests
         * from the node state machine; thus, disable state machine
         */
        els->els_req_free = true;
        efc_node_post_els_resp(els->node, evt, arg);

        efc_els_io_free(els);
}

static int
efc_ct_acc_cb(void *arg, u32 length, int status, u32 ext_status)
{
        struct efc_els_io_req *els = arg;

        efc_els_io_free(els);

        return 0;
}

int
efc_send_ct_rsp(struct efc *efc, struct efc_node *node, u16 ox_id,
                struct fc_ct_hdr *ct_hdr, u32 cmd_rsp_code,
                u32 reason_code, u32 reason_code_explanation)
{
        struct efc_els_io_req *els = NULL;
        struct fc_ct_hdr  *rsp = NULL;

        els = efc_els_io_alloc(node, 256);
        if (!els) {
                efc_log_err(efc, "IO alloc failed\n");
                return -EIO;
        }

        rsp = els->io.rsp.virt;

        *rsp = *ct_hdr;

        fcct_build_req_header(rsp, cmd_rsp_code, 0);
        rsp->ct_reason = reason_code;
        rsp->ct_explan = reason_code_explanation;

        els->display_name = "ct_rsp";
        els->cb = efc_ct_acc_cb;

        /* Prepare the IO request details */
        els->io.io_type = EFC_DISC_IO_CT_RESP;
        els->io.xmit_len = sizeof(*rsp);

        els->io.rpi = node->rnode.indicator;
        els->io.d_id = node->rnode.fc_id;

        memset(&els->io.iparam, 0, sizeof(els->io.iparam));

        els->io.iparam.ct.ox_id = ox_id;
        els->io.iparam.ct.r_ctl = 3;
        els->io.iparam.ct.type = FC_TYPE_CT;
        els->io.iparam.ct.df_ctl = 0;
        els->io.iparam.ct.timeout = 5;

        if (efc->tt.send_els(efc, &els->io)) {
                efc_els_io_free(els);
                return -EIO;
        }
        return 0;
}

int
efc_send_bls_acc(struct efc_node *node, struct fc_frame_header *hdr)
{
        struct sli_bls_params bls;
        struct fc_ba_acc *acc;
        struct efc *efc = node->efc;

        memset(&bls, 0, sizeof(bls));
        bls.ox_id = be16_to_cpu(hdr->fh_ox_id);
        bls.rx_id = be16_to_cpu(hdr->fh_rx_id);
        bls.s_id = ntoh24(hdr->fh_d_id);
        bls.d_id = node->rnode.fc_id;
        bls.rpi = node->rnode.indicator;
        bls.vpi = node->nport->indicator;

        acc = (void *)bls.payload;
        acc->ba_ox_id = cpu_to_be16(bls.ox_id);
        acc->ba_rx_id = cpu_to_be16(bls.rx_id);
        acc->ba_high_seq_cnt = cpu_to_be16(U16_MAX);

        return efc->tt.send_bls(efc, FC_RCTL_BA_ACC, &bls);
}