/*-
 * Copyright (c) 2017 Broadcom. All rights reserved.
 * The term "Broadcom" refers to Broadcom Limited and/or its subsidiaries.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 * Code to handle unsolicited received FC frames.
 */

/*!
 * @defgroup unsol Unsolicited Frame Handling
 */

#include "ocs.h"
#include "ocs_els.h"
#include "ocs_fabric.h"
#include "ocs_device.h"

#define frame_printf(ocs, hdr, fmt, ...) \
        do { \
                char s_id_text[16]; \
                ocs_node_fcid_display(fc_be24toh((hdr)->s_id), s_id_text, sizeof(s_id_text)); \
                ocs_log_debug(ocs, "[%06x.%s] %02x/%04x/%04x: " fmt, fc_be24toh((hdr)->d_id), s_id_text, \
                        (hdr)->r_ctl, ocs_be16toh((hdr)->ox_id), ocs_be16toh((hdr)->rx_id), ##__VA_ARGS__); \
        } while(0)

static int32_t ocs_unsol_process(ocs_t *ocs, ocs_hw_sequence_t *seq);
static int32_t ocs_dispatch_fcp_cmd(ocs_node_t *node, ocs_hw_sequence_t *seq);
static int32_t ocs_dispatch_fcp_cmd_auto_xfer_rdy(ocs_node_t *node, ocs_hw_sequence_t *seq);
static int32_t ocs_dispatch_fcp_data(ocs_node_t *node, ocs_hw_sequence_t *seq);
static int32_t ocs_domain_dispatch_frame(void *arg, ocs_hw_sequence_t *seq);
static int32_t ocs_node_dispatch_frame(void *arg, ocs_hw_sequence_t *seq);
static int32_t ocs_fc_tmf_rejected_cb(ocs_io_t *io, ocs_scsi_io_status_e scsi_status, uint32_t flags, void *arg);
static ocs_hw_sequence_t *ocs_frame_next(ocs_list_t *pend_list, ocs_lock_t *list_lock);
static uint8_t ocs_node_frames_held(void *arg);
static uint8_t ocs_domain_frames_held(void *arg);
static int32_t ocs_purge_pending(ocs_t *ocs, ocs_list_t *pend_list, ocs_lock_t *list_lock);
static int32_t ocs_sframe_send_task_set_full_or_busy(ocs_node_t *node, ocs_hw_sequence_t *seq);

#define OCS_MAX_FRAMES_BEFORE_YEILDING 10000

/**
 * @brief Process the RQ circular buffer and process the incoming frames.
 *
 * @param mythread Pointer to thread object.
 *
 * @return Returns 0 on success, or a non-zero value on failure.
 */
int32_t
ocs_unsol_rq_thread(ocs_thread_t *mythread)
{
        ocs_xport_rq_thread_info_t *thread_data = mythread->arg;
        ocs_t *ocs = thread_data->ocs;
        ocs_hw_sequence_t *seq;
        uint32_t yield_count = OCS_MAX_FRAMES_BEFORE_YEILDING;

        ocs_log_debug(ocs, "%s running\n", mythread->name);
        while (!ocs_thread_terminate_requested(mythread)) {
                seq = ocs_cbuf_get(thread_data->seq_cbuf, 100000);
                if (seq == NULL) {
                        /* Prevent soft lockups by yielding the CPU */
                        ocs_thread_yield(&thread_data->thread);
                        yield_count = OCS_MAX_FRAMES_BEFORE_YEILDING;
                        continue;
                }
                /* Note: Always returns 0 */
                ocs_unsol_process((ocs_t*)seq->hw->os, seq);

                /* We have to prevent CPU soft lockups, so just yield the CPU after x frames. */
                if (--yield_count == 0) {
                        ocs_thread_yield(&thread_data->thread);
                        yield_count = OCS_MAX_FRAMES_BEFORE_YEILDING;
                }
        }
        ocs_log_debug(ocs, "%s exiting\n", mythread->name);
        thread_data->thread_started = FALSE;
        return 0;
}

/**
 * @ingroup unsol
 * @brief Callback function when aborting a port owned XRI
 * exchanges.
 *
 * @return Returns 0.
 */
static int32_t
ocs_unsol_abort_cb (ocs_hw_io_t *hio, ocs_remote_node_t *rnode, uint32_t len, int32_t status, uint32_t ext, void *arg)
{
        ocs_t *ocs = arg;
        ocs_assert(hio, -1);
        ocs_assert(arg, -1);
        ocs_log_debug(ocs, "xri=0x%x tag=0x%x\n", hio->indicator, hio->reqtag);
        ocs_hw_io_free(&ocs->hw, hio);
        return 0;
}

/**
 * @ingroup unsol
 * @brief Abort either a RQ Pair auto XFER RDY XRI.
 * @return Returns None.
 */
static void
ocs_port_owned_abort(ocs_t *ocs, ocs_hw_io_t *hio)
{
        ocs_hw_rtn_e hw_rc;
        hw_rc = ocs_hw_io_abort(&ocs->hw, hio, FALSE,
                                  ocs_unsol_abort_cb, ocs);
        if((hw_rc == OCS_HW_RTN_IO_ABORT_IN_PROGRESS) ||
           (hw_rc == OCS_HW_RTN_IO_PORT_OWNED_ALREADY_ABORTED)) {
                ocs_log_debug(ocs, "already aborted XRI 0x%x\n", hio->indicator);
        } else if(hw_rc != OCS_HW_RTN_SUCCESS) {
                ocs_log_debug(ocs, "Error aborting XRI 0x%x status %d\n",
                              hio->indicator, hw_rc);
        }
}

/**
 * @ingroup unsol
 * @brief Handle unsolicited FC frames.
 *
 * <h3 class="desc">Description</h3>
 * This function is called from the HW with unsolicited FC frames (FCP, ELS, BLS, etc.).
 *
 * @param arg Application-specified callback data.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 on success; or a negative error value on failure.
 */

int32_t
ocs_unsolicited_cb(void *arg, ocs_hw_sequence_t *seq)
{
        ocs_t *ocs = arg;
        ocs_xport_t *xport = ocs->xport;
        int32_t rc;

        CPUTRACE("");

        if (ocs->rq_threads == 0) {
                rc = ocs_unsol_process(ocs, seq);
        } else {
                /* use the ox_id to dispatch this IO to a thread */
                fc_header_t *hdr = seq->header->dma.virt;
                uint32_t ox_id =  ocs_be16toh(hdr->ox_id);
                uint32_t thr_index = ox_id % ocs->rq_threads;

                rc = ocs_cbuf_put(xport->rq_thread_info[thr_index].seq_cbuf, seq);
        }

        if (rc) {
                ocs_hw_sequence_free(&ocs->hw, seq);
        }

        return 0;
}

/**
 * @ingroup unsol
 * @brief Handle unsolicited FC frames.
 *
 * <h3 class="desc">Description</h3>
 * This function is called either from ocs_unsolicited_cb() or ocs_unsol_rq_thread().
 *
 * @param ocs Pointer to the ocs structure.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 on success, or a negative error value on failure.
 */
static int32_t
ocs_unsol_process(ocs_t *ocs, ocs_hw_sequence_t *seq)
{
        ocs_xport_fcfi_t *xport_fcfi = NULL;
        ocs_domain_t *domain;
        uint8_t seq_fcfi = seq->fcfi;

        /* HW_WORKAROUND_OVERRIDE_FCFI_IN_SRB */
        if (ocs->hw.workaround.override_fcfi) {
                if (ocs->hw.first_domain_idx > -1) {
                        seq_fcfi = ocs->hw.first_domain_idx;
                }
        }

        /* Range check seq->fcfi */
        if (seq_fcfi < ARRAY_SIZE(ocs->xport->fcfi)) {
                xport_fcfi = &ocs->xport->fcfi[seq_fcfi];
        }

        /* If the transport FCFI entry is NULL, then drop the frame */
        if (xport_fcfi == NULL) {
                ocs_log_test(ocs, "FCFI %d is not valid, dropping frame\n", seq->fcfi);
                if (seq->hio != NULL) {
                        ocs_port_owned_abort(ocs, seq->hio);
                }

                ocs_hw_sequence_free(&ocs->hw, seq);
                return 0;
        }
        domain = ocs_hw_domain_get(&ocs->hw, seq_fcfi);

        /*
         * If we are holding frames or the domain is not yet registered or
         * there's already frames on the pending list,
         * then add the new frame to pending list
         */
        if (domain == NULL ||
            xport_fcfi->hold_frames ||
            !ocs_list_empty(&xport_fcfi->pend_frames)) {
                ocs_lock(&xport_fcfi->pend_frames_lock);
                        ocs_list_add_tail(&xport_fcfi->pend_frames, seq);
                ocs_unlock(&xport_fcfi->pend_frames_lock);

                if (domain != NULL) {
                        /* immediately process pending frames */
                        ocs_domain_process_pending(domain);
                }
        } else {
                /*
                 * We are not holding frames and pending list is empty, just process frame.
                 * A non-zero return means the frame was not handled - so cleanup
                 */
                if (ocs_domain_dispatch_frame(domain, seq)) {
                        if (seq->hio != NULL) {
                                ocs_port_owned_abort(ocs, seq->hio);
                        }
                        ocs_hw_sequence_free(&ocs->hw, seq);
                }
        }
        return 0;
}

/**
 * @ingroup unsol
 * @brief Process pending frames queued to the given node.
 *
 * <h3 class="desc">Description</h3>
 * Frames that are queued for the \c node are dispatched and returned
 * to the RQ.
 *
 * @param node Node of the queued frames that are to be dispatched.
 *
 * @return Returns 0 on success, or a negative error value on failure.
 */

int32_t
ocs_process_node_pending(ocs_node_t *node)
{
        ocs_t *ocs = node->ocs;
        ocs_hw_sequence_t *seq = NULL;
        uint32_t pend_frames_processed = 0;

        for (;;) {
                /* need to check for hold frames condition after each frame processed
                 * because any given frame could cause a transition to a state that
                 * holds frames
                 */
                if (ocs_node_frames_held(node)) {
                        break;
                }

                /* Get next frame/sequence */
                ocs_lock(&node->pend_frames_lock);
                        seq = ocs_list_remove_head(&node->pend_frames);
                        if (seq == NULL) {
                                pend_frames_processed = node->pend_frames_processed;
                                node->pend_frames_processed = 0;
                                ocs_unlock(&node->pend_frames_lock);
                                break;
                        }
                        node->pend_frames_processed++;
                ocs_unlock(&node->pend_frames_lock);

                /* now dispatch frame(s) to dispatch function */
                if (ocs_node_dispatch_frame(node, seq)) {
                        if (seq->hio != NULL) {
                                ocs_port_owned_abort(ocs, seq->hio);
                        }
                        ocs_hw_sequence_free(&ocs->hw, seq);
                }
        }

        if (pend_frames_processed != 0) {
                ocs_log_debug(ocs, "%u node frames held and processed\n", pend_frames_processed);
        }

        return 0;
}

/**
 * @ingroup unsol
 * @brief Process pending frames queued to the given domain.
 *
 * <h3 class="desc">Description</h3>
 * Frames that are queued for the \c domain are dispatched and
 * returned to the RQ.
 *
 * @param domain Domain of the queued frames that are to be
 *               dispatched.
 *
 * @return Returns 0 on success, or a negative error value on failure.
 */

int32_t
ocs_domain_process_pending(ocs_domain_t *domain)
{
        ocs_t *ocs = domain->ocs;
        ocs_xport_fcfi_t *xport_fcfi;
        ocs_hw_sequence_t *seq = NULL;
        uint32_t pend_frames_processed = 0;

        ocs_assert(domain->fcf_indicator < SLI4_MAX_FCFI, -1);
        xport_fcfi = &ocs->xport->fcfi[domain->fcf_indicator];

        for (;;) {
                /* need to check for hold frames condition after each frame processed
                 * because any given frame could cause a transition to a state that
                 * holds frames
                 */
                if (ocs_domain_frames_held(domain)) {
                        break;
                }

                /* Get next frame/sequence */
                ocs_lock(&xport_fcfi->pend_frames_lock);
                        seq = ocs_list_remove_head(&xport_fcfi->pend_frames);
                        if (seq == NULL) {
                                pend_frames_processed = xport_fcfi->pend_frames_processed;
                                xport_fcfi->pend_frames_processed = 0;
                                ocs_unlock(&xport_fcfi->pend_frames_lock);
                                break;
                        }
                        xport_fcfi->pend_frames_processed++;
                ocs_unlock(&xport_fcfi->pend_frames_lock);

                /* now dispatch frame(s) to dispatch function */
                if (ocs_domain_dispatch_frame(domain, seq)) {
                        if (seq->hio != NULL) {
                                ocs_port_owned_abort(ocs, seq->hio);
                        }
                        ocs_hw_sequence_free(&ocs->hw, seq);
                }
        }
        if (pend_frames_processed != 0) {
                ocs_log_debug(ocs, "%u domain frames held and processed\n", pend_frames_processed);
        }
        return 0;
}

/**
 * @ingroup unsol
 * @brief Purge given pending list
 *
 * <h3 class="desc">Description</h3>
 * Frames that are queued on the given pending list are
 * discarded and returned to the RQ.
 *
 * @param ocs Pointer to ocs object.
 * @param pend_list Pending list to be purged.
 * @param list_lock Lock that protects pending list.
 *
 * @return Returns 0 on success, or a negative error value on failure.
 */

static int32_t
ocs_purge_pending(ocs_t *ocs, ocs_list_t *pend_list, ocs_lock_t *list_lock)
{
        ocs_hw_sequence_t *frame;

        for (;;) {
                frame = ocs_frame_next(pend_list, list_lock);
                if (frame == NULL) {
                        break;
                }

                frame_printf(ocs, (fc_header_t*) frame->header->dma.virt, "Discarding held frame\n");
                if (frame->hio != NULL) {
                        ocs_port_owned_abort(ocs, frame->hio);
                }
                ocs_hw_sequence_free(&ocs->hw, frame);
        }

        return 0;
}

/**
 * @ingroup unsol
 * @brief Purge node's pending (queued) frames.
 *
 * <h3 class="desc">Description</h3>
 * Frames that are queued for the \c node are discarded and returned
 * to the RQ.
 *
 * @param node Node of the queued frames that are to be discarded.
 *
 * @return Returns 0 on success, or a negative error value on failure.
 */

int32_t
ocs_node_purge_pending(ocs_node_t *node)
{
        return ocs_purge_pending(node->ocs, &node->pend_frames, &node->pend_frames_lock);
}

/**
 * @ingroup unsol
 * @brief Purge xport's pending (queued) frames.
 *
 * <h3 class="desc">Description</h3>
 * Frames that are queued for the \c xport are discarded and
 * returned to the RQ.
 *
 * @param domain Pointer to domain object.
 *
 * @return Returns 0 on success; or a negative error value on failure.
 */

int32_t
ocs_domain_purge_pending(ocs_domain_t *domain)
{
        ocs_t *ocs = domain->ocs;
        ocs_xport_fcfi_t *xport_fcfi;

        ocs_assert(domain->fcf_indicator < SLI4_MAX_FCFI, -1);
        xport_fcfi = &ocs->xport->fcfi[domain->fcf_indicator];
        return ocs_purge_pending(domain->ocs,
                                 &xport_fcfi->pend_frames,
                                 &xport_fcfi->pend_frames_lock);
}

/**
 * @ingroup unsol
 * @brief Check if node's pending frames are held.
 *
 * @param arg Node for which the pending frame hold condition is
 * checked.
 *
 * @return Returns 1 if node is holding pending frames, or 0
 * if not.
 */

static uint8_t
ocs_node_frames_held(void *arg)
{
        ocs_node_t *node = (ocs_node_t *)arg;
        return node->hold_frames;
}

/**
 * @ingroup unsol
 * @brief Check if domain's pending frames are held.
 *
 * @param arg Domain for which the pending frame hold condition is
 * checked.
 *
 * @return Returns 1 if domain is holding pending frames, or 0
 * if not.
 */

static uint8_t
ocs_domain_frames_held(void *arg)
{
        ocs_domain_t *domain = (ocs_domain_t *)arg;
        ocs_t *ocs = domain->ocs;
        ocs_xport_fcfi_t *xport_fcfi;

        ocs_assert(domain != NULL, 1);
        ocs_assert(domain->fcf_indicator < SLI4_MAX_FCFI, 1);
        xport_fcfi = &ocs->xport->fcfi[domain->fcf_indicator];
        return xport_fcfi->hold_frames;
}

/**
 * @ingroup unsol
 * @brief Globally (at xport level) hold unsolicited frames.
 *
 * <h3 class="desc">Description</h3>
 * This function places a hold on processing unsolicited FC
 * frames queued to the xport pending list.
 *
 * @param domain Pointer to domain object.
 *
 * @return Returns None.
 */

void
ocs_domain_hold_frames(ocs_domain_t *domain)
{
        ocs_t *ocs = domain->ocs;
        ocs_xport_fcfi_t *xport_fcfi;

        ocs_assert(domain->fcf_indicator < SLI4_MAX_FCFI);
        xport_fcfi = &ocs->xport->fcfi[domain->fcf_indicator];
        if (!xport_fcfi->hold_frames) {
                ocs_log_debug(domain->ocs, "hold frames set for FCFI %d\n",
                              domain->fcf_indicator);
                xport_fcfi->hold_frames = 1;
        }
}

/**
 * @ingroup unsol
 * @brief Clear hold on unsolicited frames.
 *
 * <h3 class="desc">Description</h3>
 * This function clears the hold on processing unsolicited FC
 * frames queued to the domain pending list.
 *
 * @param domain Pointer to domain object.
 *
 * @return Returns None.
 */

void
ocs_domain_accept_frames(ocs_domain_t *domain)
{
        ocs_t *ocs = domain->ocs;
        ocs_xport_fcfi_t *xport_fcfi;

        ocs_assert(domain->fcf_indicator < SLI4_MAX_FCFI);
        xport_fcfi = &ocs->xport->fcfi[domain->fcf_indicator];
        if (xport_fcfi->hold_frames == 1) {
                ocs_log_debug(domain->ocs, "hold frames cleared for FCFI %d\n",
                              domain->fcf_indicator);
        }
        xport_fcfi->hold_frames = 0;
        ocs_domain_process_pending(domain);
}

/**
 * @ingroup unsol
 * @brief Dispatch unsolicited FC frame.
 *
 * <h3 class="desc">Description</h3>
 * This function processes an unsolicited FC frame queued at the
 * domain level.
 *
 * @param arg Pointer to ocs object.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 if frame processed and RX buffers cleaned
 * up appropriately, -1 if frame not handled.
 */

static __inline int32_t
ocs_domain_dispatch_frame(void *arg, ocs_hw_sequence_t *seq)
{
        ocs_domain_t *domain = (ocs_domain_t *)arg;
        ocs_t *ocs = domain->ocs;
        fc_header_t *hdr;
        uint32_t s_id;
        uint32_t d_id;
        ocs_node_t *node = NULL;
        ocs_sport_t *sport = NULL;

        ocs_assert(seq->header, -1);
        ocs_assert(seq->header->dma.virt, -1);
        ocs_assert(seq->payload->dma.virt, -1);

        hdr = seq->header->dma.virt;

        /* extract the s_id and d_id */
        s_id = fc_be24toh(hdr->s_id);
        d_id = fc_be24toh(hdr->d_id);

        sport = domain->sport;
        if (sport == NULL) {
                frame_printf(ocs, hdr, "phy sport for FC ID 0x%06x is NULL, dropping frame\n", d_id);
                return -1;
        }

        if (sport->fc_id != d_id) {
                /* Not a physical port IO lookup sport associated with the npiv port */
                sport = ocs_sport_find(domain, d_id); /* Look up without lock */
                if (sport == NULL) {
                        if (hdr->type == FC_TYPE_FCP) {
                                /* Drop frame */
                                ocs_log_warn(ocs, "unsolicited FCP frame with invalid d_id x%x, dropping\n",
                                             d_id);
                                return -1;
                        } else {
                                /* p2p will use this case */
                                sport = domain->sport;
                        }
                }
        }

        /* Lookup the node given the remote s_id */
        node = ocs_node_find(sport, s_id);

        /* If not found, then create a new node */
        if (node == NULL) {
                /* If this is solicited data or control based on R_CTL and there is no node context,
                 * then we can drop the frame
                 */
                if ((hdr->r_ctl == FC_RCTL_FC4_DATA) && (
                    (hdr->info == FC_RCTL_INFO_SOL_DATA) || (hdr->info == FC_RCTL_INFO_SOL_CTRL))) {
                        ocs_log_debug(ocs, "solicited data/ctrl frame without node, dropping\n");
                        return -1;
                }
                node = ocs_node_alloc(sport, s_id, FALSE, FALSE);
                if (node == NULL) {
                        ocs_log_err(ocs, "ocs_node_alloc() failed\n");
                        return -1;
                }
                /* don't send PLOGI on ocs_d_init entry */
                ocs_node_init_device(node, FALSE);
        }

        if (node->hold_frames || !ocs_list_empty((&node->pend_frames))) {
                /* TODO: info log level
                frame_printf(ocs, hdr, "Holding frame\n");
                */
                /* add frame to node's pending list */
                ocs_lock(&node->pend_frames_lock);
                        ocs_list_add_tail(&node->pend_frames, seq);
                ocs_unlock(&node->pend_frames_lock);

                return 0;
        }

        /* now dispatch frame to the node frame handler */
        return ocs_node_dispatch_frame(node, seq);
}

/**
 * @ingroup unsol
 * @brief Dispatch a frame.
 *
 * <h3 class="desc">Description</h3>
 * A frame is dispatched from the \c node to the handler.
 *
 * @param arg Node that originated the frame.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 if frame processed and RX buffers cleaned
 * up appropriately, -1 if frame not handled.
 */
static int32_t
ocs_node_dispatch_frame(void *arg, ocs_hw_sequence_t *seq)
{

        fc_header_t *hdr = seq->header->dma.virt;
        uint32_t port_id;
        ocs_node_t *node = (ocs_node_t *)arg;
        int32_t rc = -1;
        int32_t sit_set = 0;

        port_id = fc_be24toh(hdr->s_id);
        ocs_assert(port_id == node->rnode.fc_id, -1);

        if (fc_be24toh(hdr->f_ctl) & FC_FCTL_END_SEQUENCE) {
                /*if SIT is set */
                if (fc_be24toh(hdr->f_ctl) & FC_FCTL_SEQUENCE_INITIATIVE) {
                        sit_set = 1;
                }
                switch (hdr->r_ctl) {
                case FC_RCTL_ELS:
                        if (sit_set) {
                                rc = ocs_node_recv_els_frame(node, seq);
                        }
                        break;

                case FC_RCTL_BLS:
                        if ((sit_set) && (hdr->info == FC_INFO_ABTS)) {
                                rc = ocs_node_recv_abts_frame(node, seq);
                        }else {
                                rc = ocs_node_recv_bls_no_sit(node, seq);
                        }
                        break;

                case FC_RCTL_FC4_DATA:
                        switch(hdr->type) {
                        case FC_TYPE_FCP:
                                if (hdr->info == FC_RCTL_INFO_UNSOL_CMD) {
                                        if (node->fcp_enabled) {
                                                if (sit_set) {
                                                        rc = ocs_dispatch_fcp_cmd(node, seq);
                                                }else {
                                                        /* send the auto xfer ready command */
                                                        rc = ocs_dispatch_fcp_cmd_auto_xfer_rdy(node, seq);
                                                }
                                        } else {
                                                rc = ocs_node_recv_fcp_cmd(node, seq);
                                        }
                                } else if (hdr->info == FC_RCTL_INFO_SOL_DATA) {
                                        if (sit_set) {
                                                rc = ocs_dispatch_fcp_data(node, seq);
                                        }
                                }
                                break;
                        case FC_TYPE_GS:
                                if (sit_set) {
                                        rc = ocs_node_recv_ct_frame(node, seq);
                                }
                                break;
                        default:
                                break;
                        }
                        break;
                }
        } else {
                node_printf(node, "Dropping frame hdr = %08x %08x %08x %08x %08x %08x\n",
                            ocs_htobe32(((uint32_t *)hdr)[0]),
                            ocs_htobe32(((uint32_t *)hdr)[1]),
                            ocs_htobe32(((uint32_t *)hdr)[2]),
                            ocs_htobe32(((uint32_t *)hdr)[3]),
                            ocs_htobe32(((uint32_t *)hdr)[4]),
                            ocs_htobe32(((uint32_t *)hdr)[5]));
        }
        return rc;
}

/**
 * @ingroup unsol
 * @brief Dispatch unsolicited FCP frames (RQ Pair).
 *
 * <h3 class="desc">Description</h3>
 * Dispatch unsolicited FCP frames (called from the device node state machine).
 *
 * @param io Pointer to the IO context.
 * @param task_management_flags Task management flags from the FCP_CMND frame.
 * @param node Node that originated the frame.
 * @param lun 32-bit LUN from FCP_CMND frame.
 *
 * @return Returns None.
 */

static void
ocs_dispatch_unsolicited_tmf(ocs_io_t *io, uint8_t task_management_flags, ocs_node_t *node, uint64_t lun)
{
        uint32_t i;
        struct {
                uint32_t mask;
                ocs_scsi_tmf_cmd_e cmd;
        } tmflist[] = {
                {FCP_QUERY_TASK_SET,            OCS_SCSI_TMF_QUERY_TASK_SET},
                {FCP_ABORT_TASK_SET,            OCS_SCSI_TMF_ABORT_TASK_SET},
                {FCP_CLEAR_TASK_SET,            OCS_SCSI_TMF_CLEAR_TASK_SET},
                {FCP_QUERY_ASYNCHRONOUS_EVENT,  OCS_SCSI_TMF_QUERY_ASYNCHRONOUS_EVENT},
                {FCP_LOGICAL_UNIT_RESET,        OCS_SCSI_TMF_LOGICAL_UNIT_RESET},
                {FCP_TARGET_RESET,              OCS_SCSI_TMF_TARGET_RESET},
                {FCP_CLEAR_ACA,                 OCS_SCSI_TMF_CLEAR_ACA}};

        io->exp_xfer_len = 0; /* BUG 32235 */

        for (i = 0; i < ARRAY_SIZE(tmflist); i ++) {
                if (tmflist[i].mask & task_management_flags) {
                        io->tmf_cmd = tmflist[i].cmd;
                        ocs_scsi_recv_tmf(io, lun, tmflist[i].cmd, NULL, 0);
                        break;
                }
        }
        if (i == ARRAY_SIZE(tmflist)) {
                /* Not handled */
                node_printf(node, "TMF x%x rejected\n", task_management_flags);
                ocs_scsi_send_tmf_resp(io, OCS_SCSI_TMF_FUNCTION_REJECTED, NULL, ocs_fc_tmf_rejected_cb, NULL);
        }
}

static int32_t
ocs_validate_fcp_cmd(ocs_t *ocs, ocs_hw_sequence_t *seq)
{
        size_t          exp_payload_len = 0;
        fcp_cmnd_iu_t *cmnd = seq->payload->dma.virt;
        exp_payload_len = sizeof(fcp_cmnd_iu_t) - 16 + cmnd->additional_fcp_cdb_length;

        /*
         * If we received less than FCP_CMND_IU bytes, assume that the frame is
         * corrupted in some way and drop it. This was seen when jamming the FCTL
         * fill bytes field.
         */
        if (seq->payload->dma.len < exp_payload_len) {
                fc_header_t     *fchdr = seq->header->dma.virt;
                ocs_log_debug(ocs, "dropping ox_id %04x with payload length (%zd) less than expected (%zd)\n",
                              ocs_be16toh(fchdr->ox_id), seq->payload->dma.len,
                              exp_payload_len);
                return -1;
        }
        return 0;

}

static void
ocs_populate_io_fcp_cmd(ocs_io_t *io, fcp_cmnd_iu_t *cmnd, fc_header_t *fchdr, uint8_t sit)
{
        uint32_t        *fcp_dl;
        io->init_task_tag = ocs_be16toh(fchdr->ox_id);
        /* note, tgt_task_tag, hw_tag  set when HW io is allocated */
        fcp_dl = (uint32_t*)(&(cmnd->fcp_cdb_and_dl));
        fcp_dl += cmnd->additional_fcp_cdb_length;
        io->exp_xfer_len = ocs_be32toh(*fcp_dl);
        io->transferred = 0;

        /* The upper 7 bits of CS_CTL is the frame priority thru the SAN.
         * Our assertion here is, the priority given to a frame containing
         * the FCP cmd should be the priority given to ALL frames contained
         * in that IO. Thus we need to save the incoming CS_CTL here.
         */
        if (fc_be24toh(fchdr->f_ctl) & FC_FCTL_PRIORITY_ENABLE) {
                io->cs_ctl = fchdr->cs_ctl;
        } else {
                io->cs_ctl = 0;
        }
        io->seq_init = sit;
}

static uint32_t
ocs_get_flags_fcp_cmd(fcp_cmnd_iu_t *cmnd)
{
        uint32_t flags = 0;
        switch (cmnd->task_attribute) {
        case FCP_TASK_ATTR_SIMPLE:
                flags |= OCS_SCSI_CMD_SIMPLE;
                break;
        case FCP_TASK_ATTR_HEAD_OF_QUEUE:
                flags |= OCS_SCSI_CMD_HEAD_OF_QUEUE;
                break;
        case FCP_TASK_ATTR_ORDERED:
                flags |= OCS_SCSI_CMD_ORDERED;
                break;
        case FCP_TASK_ATTR_ACA:
                flags |= OCS_SCSI_CMD_ACA;
                break;
        case FCP_TASK_ATTR_UNTAGGED:
                flags |= OCS_SCSI_CMD_UNTAGGED;
                break;
        }
        flags |= (uint32_t)cmnd->command_priority << OCS_SCSI_PRIORITY_SHIFT;
        if (cmnd->wrdata)
                flags |= OCS_SCSI_CMD_DIR_IN;
        if (cmnd->rddata)
                flags |= OCS_SCSI_CMD_DIR_OUT;

        return flags;
}

/**
 * @ingroup unsol
 * @brief Dispatch unsolicited FCP_CMND frame.
 *
 * <h3 class="desc">Description</h3>
 * Dispatch unsolicited FCP_CMND frame. RQ Pair mode - always
 * used for RQ Pair mode since first burst is not supported.
 *
 * @param node Node that originated the frame.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 if frame processed and RX buffers cleaned
 * up appropriately, -1 if frame not handled and RX buffers need
 * to be returned.
 */
static int32_t
ocs_dispatch_fcp_cmd(ocs_node_t *node, ocs_hw_sequence_t *seq)
{
        ocs_t *ocs = node->ocs;
        fc_header_t     *fchdr = seq->header->dma.virt;
        fcp_cmnd_iu_t   *cmnd = NULL;
        ocs_io_t        *io = NULL;
        fc_vm_header_t  *vhdr;
        uint8_t         df_ctl;
        uint64_t        lun = UINT64_MAX;
        int32_t         rc = 0;

        ocs_assert(seq->payload, -1);
        cmnd = seq->payload->dma.virt;

        /* perform FCP_CMND validation check(s) */
        if (ocs_validate_fcp_cmd(ocs, seq)) {
                return -1;
        }

        lun = CAM_EXTLUN_BYTE_SWIZZLE(be64dec(cmnd->fcp_lun));
        if (lun == UINT64_MAX) {
                return -1;
        }

        io = ocs_scsi_io_alloc(node, OCS_SCSI_IO_ROLE_RESPONDER);
        if (io == NULL) {
                uint32_t send_frame_capable;

                /* If we have SEND_FRAME capability, then use it to send task set full or busy */
                rc = ocs_hw_get(&ocs->hw, OCS_HW_SEND_FRAME_CAPABLE, &send_frame_capable);
                if ((rc == 0) && send_frame_capable) {
                        rc = ocs_sframe_send_task_set_full_or_busy(node, seq);
                        if (rc) {
                                ocs_log_test(ocs, "ocs_sframe_send_task_set_full_or_busy failed: %d\n", rc);
                        }
                        return rc;
                }

                ocs_log_err(ocs, "IO allocation failed ox_id %04x\n", ocs_be16toh(fchdr->ox_id));
                return -1;
        }
        io->hw_priv = seq->hw_priv;

        /* Check if the CMD has vmheader. */
        io->app_id = 0;
        df_ctl = fchdr->df_ctl;
        if (df_ctl & FC_DFCTL_DEVICE_HDR_16_MASK) {
                uint32_t vmhdr_offset = 0;
                /* Presence of VMID. Get the vm header offset. */
                if (df_ctl & FC_DFCTL_ESP_HDR_MASK) {
                        vmhdr_offset += FC_DFCTL_ESP_HDR_SIZE;
                        ocs_log_err(ocs, "ESP Header present. Fix ESP Size.\n");
                }

                if (df_ctl & FC_DFCTL_NETWORK_HDR_MASK) {
                        vmhdr_offset += FC_DFCTL_NETWORK_HDR_SIZE;
                }
                vhdr = (fc_vm_header_t *) ((char *)fchdr + sizeof(fc_header_t) + vmhdr_offset);
                io->app_id = ocs_be32toh(vhdr->src_vmid);
        }

        /* RQ pair, if we got here, SIT=1 */
        ocs_populate_io_fcp_cmd(io, cmnd, fchdr, TRUE);

        if (cmnd->task_management_flags) {
                ocs_dispatch_unsolicited_tmf(io, cmnd->task_management_flags, node, lun);
        } else {
                uint32_t flags = ocs_get_flags_fcp_cmd(cmnd);

                /* can return failure for things like task set full and UAs,
                 * no need to treat as a dropped frame if rc != 0
                 */
                ocs_scsi_recv_cmd(io, lun, cmnd->fcp_cdb,
                                  sizeof(cmnd->fcp_cdb) +
                                  (cmnd->additional_fcp_cdb_length * sizeof(uint32_t)),
                                  flags);
        }

        /* successfully processed, now return RX buffer to the chip */
        ocs_hw_sequence_free(&ocs->hw, seq);
        return 0;
}

/**
 * @ingroup unsol
 * @brief Dispatch unsolicited FCP_CMND frame (auto xfer rdy).
 *
 * <h3 class="desc">Description</h3>
 * Dispatch unsolicited FCP_CMND frame that is assisted with auto xfer ready.
 *
 * @param node Node that originated the frame.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 if frame processed and RX buffers cleaned
 * up appropriately, -1 if frame not handled and RX buffers need
 * to be returned.
 */
static int32_t
ocs_dispatch_fcp_cmd_auto_xfer_rdy(ocs_node_t *node, ocs_hw_sequence_t *seq)
{
        ocs_t *ocs = node->ocs;
        fc_header_t     *fchdr = seq->header->dma.virt;
        fcp_cmnd_iu_t   *cmnd = NULL;
        ocs_io_t        *io = NULL;
        uint64_t        lun = UINT64_MAX;
        int32_t         rc = 0;

        ocs_assert(seq->payload, -1);
        cmnd = seq->payload->dma.virt;

        /* perform FCP_CMND validation check(s) */
        if (ocs_validate_fcp_cmd(ocs, seq)) {
                return -1;
        }

        /* make sure first burst or auto xfer_rdy is enabled */
        if (!seq->auto_xrdy) {
                node_printf(node, "IO is not Auto Xfr Rdy assisted, dropping FCP_CMND\n");
                return -1;
        }

        lun = CAM_EXTLUN_BYTE_SWIZZLE(be64dec(cmnd->fcp_lun));

        /* TODO should there be a check here for an error? Why do any of the
         * below if the LUN decode failed? */
        io = ocs_scsi_io_alloc(node, OCS_SCSI_IO_ROLE_RESPONDER);
        if (io == NULL) {
                uint32_t send_frame_capable;

                /* If we have SEND_FRAME capability, then use it to send task set full or busy */
                rc = ocs_hw_get(&ocs->hw, OCS_HW_SEND_FRAME_CAPABLE, &send_frame_capable);
                if ((rc == 0) && send_frame_capable) {
                        rc = ocs_sframe_send_task_set_full_or_busy(node, seq);
                        if (rc) {
                                ocs_log_test(ocs, "ocs_sframe_send_task_set_full_or_busy failed: %d\n", rc);
                        }
                        return rc;
                }

                ocs_log_err(ocs, "IO allocation failed ox_id %04x\n", ocs_be16toh(fchdr->ox_id));
                return -1;
        }
        io->hw_priv = seq->hw_priv;

        /* RQ pair, if we got here, SIT=0 */
        ocs_populate_io_fcp_cmd(io, cmnd, fchdr, FALSE);

        if (cmnd->task_management_flags) {
                /* first burst command better not be a TMF */
                ocs_log_err(ocs, "TMF flags set 0x%x\n", cmnd->task_management_flags);
                ocs_scsi_io_free(io);
                return -1;
        } else {
                uint32_t flags = ocs_get_flags_fcp_cmd(cmnd);

                /* activate HW IO */
                ocs_hw_io_activate_port_owned(&ocs->hw, seq->hio);
                io->hio = seq->hio;
                seq->hio->ul_io = io;
                io->tgt_task_tag = seq->hio->indicator;

                /* Note: Data buffers are received in another call */
                ocs_scsi_recv_cmd_first_burst(io, lun, cmnd->fcp_cdb,
                                              sizeof(cmnd->fcp_cdb) +
                                              (cmnd->additional_fcp_cdb_length * sizeof(uint32_t)),
                                              flags, NULL, 0);
        }

        /* FCP_CMND processed, return RX buffer to the chip */
        ocs_hw_sequence_free(&ocs->hw, seq);
        return 0;
}

/**
 * @ingroup unsol
 * @brief Dispatch FCP data frames for auto xfer ready.
 *
 * <h3 class="desc">Description</h3>
 * Dispatch unsolicited FCP data frames (auto xfer ready)
 * containing sequence initiative transferred (SIT=1).
 *
 * @param node Node that originated the frame.
 * @param seq Header/payload sequence buffers.
 *
 * @return Returns 0 if frame processed and RX buffers cleaned
 * up appropriately, -1 if frame not handled.
 */

static int32_t
ocs_dispatch_fcp_data(ocs_node_t *node, ocs_hw_sequence_t *seq)
{
        ocs_t *ocs = node->ocs;
        ocs_hw_t *hw = &ocs->hw;
        ocs_hw_io_t *hio = seq->hio;
        ocs_io_t        *io;
        ocs_dma_t fburst[1];

        ocs_assert(seq->payload, -1);
        ocs_assert(hio, -1);

        io = hio->ul_io;
        if (io == NULL) {
                ocs_log_err(ocs, "data received for NULL io, xri=0x%x\n",
                            hio->indicator);
                return -1;
        }

        /*
         * We only support data completions for auto xfer ready. Make sure
         * this is a port owned XRI.
         */
        if (!ocs_hw_is_io_port_owned(hw, seq->hio)) {
                ocs_log_err(ocs, "data received for host owned XRI, xri=0x%x\n",
                            hio->indicator);
                return -1;
        }

        /* For error statuses, pass the error to the target back end */
        if (seq->status != OCS_HW_UNSOL_SUCCESS) {
                ocs_log_err(ocs, "data with status 0x%x received, xri=0x%x\n",
                            seq->status, hio->indicator);

                /*
                 * In this case, there is an existing, in-use HW IO that
                 * first may need to be aborted. Then, the backend will be
                 * notified of the error while waiting for the data.
                 */
                ocs_port_owned_abort(ocs, seq->hio);

                /*
                 * HW IO has already been allocated and is waiting for data.
                 * Need to tell backend that an error has occurred.
                 */
                ocs_scsi_recv_cmd_first_burst(io, 0, NULL, 0, OCS_SCSI_FIRST_BURST_ERR, NULL, 0);
                return -1;
        }

        /* sequence initiative has been transferred */
        io->seq_init = 1;

        /* convert the array of pointers to the correct type, to send to backend */
        fburst[0] = seq->payload->dma;

        /* the amount of first burst data was saved as "acculated sequence length" */
        io->transferred = seq->payload->dma.len;

        if (ocs_scsi_recv_cmd_first_burst(io, 0, NULL, 0, 0,
                                          fburst, io->transferred)) {
                ocs_log_err(ocs, "error passing first burst, xri=0x%x, oxid=0x%x\n",
                            hio->indicator, io->init_task_tag);
        }

        /* Free the header and all the accumulated payload buffers */
        ocs_hw_sequence_free(&ocs->hw, seq);
        return 0;
}

/**
 * @ingroup unsol
 * @brief Handle the callback for the TMF FUNCTION_REJECTED response.
 *
 * <h3 class="desc">Description</h3>
 * Handle the callback of a send TMF FUNCTION_REJECTED response request.
 *
 * @param io Pointer to the IO context.
 * @param scsi_status Status of the response.
 * @param flags Callback flags.
 * @param arg Callback argument.
 *
 * @return Returns 0 on success, or a negative error value on failure.
 */

static int32_t
ocs_fc_tmf_rejected_cb(ocs_io_t *io, ocs_scsi_io_status_e scsi_status, uint32_t flags, void *arg)
{
        ocs_scsi_io_free(io);
        return 0;
}

/**
 * @brief Return next FC frame on node->pend_frames list
 *
 * The next FC frame on the node->pend_frames list is returned, or NULL
 * if the list is empty.
 *
 * @param pend_list Pending list to be purged.
 * @param list_lock Lock that protects pending list.
 *
 * @return Returns pointer to the next FC frame, or NULL if the pending frame list
 * is empty.
 */
static ocs_hw_sequence_t *
ocs_frame_next(ocs_list_t *pend_list, ocs_lock_t *list_lock)
{
        ocs_hw_sequence_t *frame = NULL;

        ocs_lock(list_lock);
                frame = ocs_list_remove_head(pend_list);
        ocs_unlock(list_lock);
        return frame;
}

/**
 * @brief Process send fcp response frame callback
 *
 * The function is called when the send FCP response posting has completed. Regardless
 * of the outcome, the sequence is freed.
 *
 * @param arg Pointer to originator frame sequence.
 * @param cqe Pointer to completion queue entry.
 * @param status Status of operation.
 *
 * @return None.
 */
static void
ocs_sframe_common_send_cb(void *arg, uint8_t *cqe, int32_t status)
{
        ocs_hw_send_frame_context_t *ctx = arg;
        ocs_hw_t *hw = ctx->hw;

        /* Free WQ completion callback */
        ocs_hw_reqtag_free(hw, ctx->wqcb);

        /* Free sequence */
        ocs_hw_sequence_free(hw, ctx->seq);
}

/**
 * @brief Send a frame, common code
 *
 * A frame is sent using SEND_FRAME, the R_CTL/F_CTL/TYPE may be specified, the payload is
 * sent as a single frame.
 *
 * Memory resources are allocated from RQ buffers contained in the passed in sequence data.
 *
 * @param node Pointer to node object.
 * @param seq Pointer to sequence object.
 * @param r_ctl R_CTL value to place in FC header.
 * @param info INFO value to place in FC header.
 * @param f_ctl F_CTL value to place in FC header.
 * @param type TYPE value to place in FC header.
 * @param payload Pointer to payload data
 * @param payload_len Length of payload in bytes.
 *
 * @return Returns 0 on success, or a negative error code value on failure.
 */
static int32_t
ocs_sframe_common_send(ocs_node_t *node, ocs_hw_sequence_t *seq, uint8_t r_ctl, uint8_t info, uint32_t f_ctl,
                       uint8_t type, void *payload, uint32_t payload_len)
{
        ocs_t *ocs = node->ocs;
        ocs_hw_t *hw = &ocs->hw;
        ocs_hw_rtn_e rc = 0;
        fc_header_t *behdr = seq->header->dma.virt;
        fc_header_le_t hdr;
        uint32_t s_id = fc_be24toh(behdr->s_id);
        uint32_t d_id = fc_be24toh(behdr->d_id);
        uint16_t ox_id = ocs_be16toh(behdr->ox_id);
        uint16_t rx_id = ocs_be16toh(behdr->rx_id);
        ocs_hw_send_frame_context_t *ctx;

        uint32_t heap_size = seq->payload->dma.size;
        uintptr_t heap_phys_base = seq->payload->dma.phys;
        uint8_t *heap_virt_base = seq->payload->dma.virt;
        uint32_t heap_offset = 0;

        /* Build the FC header reusing the RQ header DMA buffer */
        ocs_memset(&hdr, 0, sizeof(hdr));
        hdr.d_id = s_id;                        /* send it back to whomever sent it to us */
        hdr.r_ctl = r_ctl;
        hdr.info = info;
        hdr.s_id = d_id;
        hdr.cs_ctl = 0;
        hdr.f_ctl = f_ctl;
        hdr.type = type;
        hdr.seq_cnt = 0;
        hdr.df_ctl = 0;

        /*
         * send_frame_seq_id is an atomic, we just let it increment, while storing only
         * the low 8 bits to hdr->seq_id
         */
        hdr.seq_id = (uint8_t) ocs_atomic_add_return(&hw->send_frame_seq_id, 1);

        hdr.rx_id = rx_id;
        hdr.ox_id = ox_id;
        hdr.parameter = 0;

        /* Allocate and fill in the send frame request context */
        ctx = (void*)(heap_virt_base + heap_offset);
        heap_offset += sizeof(*ctx);
        ocs_assert(heap_offset < heap_size, -1);
        ocs_memset(ctx, 0, sizeof(*ctx));

        /* Save sequence */
        ctx->seq = seq;

        /* Allocate a response payload DMA buffer from the heap */
        ctx->payload.phys = heap_phys_base + heap_offset;
        ctx->payload.virt = heap_virt_base + heap_offset;
        ctx->payload.size = payload_len;
        ctx->payload.len = payload_len;
        heap_offset += payload_len;
        ocs_assert(heap_offset <= heap_size, -1);

        /* Copy the payload in */
        ocs_memcpy(ctx->payload.virt, payload, payload_len);

        /* Send */
        rc = ocs_hw_send_frame(&ocs->hw, (void*)&hdr, FC_SOFI3, FC_EOFT, &ctx->payload, ctx,
                                ocs_sframe_common_send_cb, ctx);
        if (rc) {
                ocs_log_test(ocs, "ocs_hw_send_frame failed: %d\n", rc);
        }

        return rc ? -1 : 0;
}

/**
 * @brief Send FCP response using SEND_FRAME
 *
 * The FCP response is send using the SEND_FRAME function.
 *
 * @param node Pointer to node object.
 * @param seq Pointer to inbound sequence.
 * @param rsp Pointer to response data.
 * @param rsp_len Length of response data, in bytes.
 *
 * @return Returns 0 on success, or a negative error code value on failure.
 */
static int32_t
ocs_sframe_send_fcp_rsp(ocs_node_t *node, ocs_hw_sequence_t *seq, void *rsp, uint32_t rsp_len)
{
        return ocs_sframe_common_send(node, seq,
                                      FC_RCTL_FC4_DATA,
                                      FC_RCTL_INFO_CMD_STATUS,
                                      FC_FCTL_EXCHANGE_RESPONDER |
                                              FC_FCTL_LAST_SEQUENCE |
                                              FC_FCTL_END_SEQUENCE |
                                              FC_FCTL_SEQUENCE_INITIATIVE,
                                      FC_TYPE_FCP,
                                      rsp, rsp_len);
}

/**
 * @brief Send task set full response
 *
 * Return a task set full or busy response using send frame.
 *
 * @param node Pointer to node object.
 * @param seq Pointer to originator frame sequence.
 *
 * @return Returns 0 on success, or a negative error code value on failure.
 */
static int32_t
ocs_sframe_send_task_set_full_or_busy(ocs_node_t *node, ocs_hw_sequence_t *seq)
{
        fcp_rsp_iu_t fcprsp;
        fcp_cmnd_iu_t *fcpcmd = seq->payload->dma.virt;
        uint32_t *fcp_dl_ptr;
        uint32_t fcp_dl;
        int32_t rc = 0;

        /* extract FCP_DL from FCP command*/
        fcp_dl_ptr = (uint32_t*)(&(fcpcmd->fcp_cdb_and_dl));
        fcp_dl_ptr += fcpcmd->additional_fcp_cdb_length;
        fcp_dl = ocs_be32toh(*fcp_dl_ptr);

        /* construct task set full or busy response */
        ocs_memset(&fcprsp, 0, sizeof(fcprsp));
        ocs_lock(&node->active_ios_lock);
                fcprsp.scsi_status = ocs_list_empty(&node->active_ios) ? SCSI_STATUS_BUSY : SCSI_STATUS_TASK_SET_FULL;
        ocs_unlock(&node->active_ios_lock);
        *((uint32_t*)&fcprsp.fcp_resid) = fcp_dl;

        /* send it using send_frame */
        rc = ocs_sframe_send_fcp_rsp(node, seq, &fcprsp, sizeof(fcprsp) - sizeof(fcprsp.data));
        if (rc) {
                ocs_log_test(node->ocs, "ocs_sframe_send_fcp_rsp failed: %d\n", rc);
        }
        return rc;
}

/**
 * @brief Send BA_ACC using sent frame
 *
 * A BA_ACC is sent using SEND_FRAME
 *
 * @param node Pointer to node object.
 * @param seq Pointer to originator frame sequence.
 *
 * @return Returns 0 on success, or a negative error code value on failure.
 */
int32_t
ocs_sframe_send_bls_acc(ocs_node_t *node,  ocs_hw_sequence_t *seq)
{
        fc_header_t *behdr = seq->header->dma.virt;
        uint16_t ox_id = ocs_be16toh(behdr->ox_id);
        uint16_t rx_id = ocs_be16toh(behdr->rx_id);
        fc_ba_acc_payload_t acc = {0};

        acc.ox_id = ocs_htobe16(ox_id);
        acc.rx_id = ocs_htobe16(rx_id);
        acc.low_seq_cnt = UINT16_MAX;
        acc.high_seq_cnt = UINT16_MAX;

        return ocs_sframe_common_send(node, seq,
                                      FC_RCTL_BLS,
                                      FC_RCTL_INFO_UNSOL_DATA,
                                      FC_FCTL_EXCHANGE_RESPONDER |
                                              FC_FCTL_LAST_SEQUENCE |
                                              FC_FCTL_END_SEQUENCE,
                                      FC_TYPE_BASIC_LINK,
                                      &acc, sizeof(acc));
}