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

#include "efct_driver.h"
#include "efct_hw.h"
#include "efct_unsol.h"

struct efct_hw_link_stat_cb_arg {
        void (*cb)(int status, u32 num_counters,
                   struct efct_hw_link_stat_counts *counters, void *arg);
        void *arg;
};

struct efct_hw_host_stat_cb_arg {
        void (*cb)(int status, u32 num_counters,
                   struct efct_hw_host_stat_counts *counters, void *arg);
        void *arg;
};

struct efct_hw_fw_wr_cb_arg {
        void (*cb)(int status, u32 bytes_written, u32 change_status, void *arg);
        void *arg;
};

struct efct_mbox_rqst_ctx {
        int (*callback)(struct efc *efc, int status, u8 *mqe, void *arg);
        void *arg;
};

static int
efct_hw_link_event_init(struct efct_hw *hw)
{
        hw->link.status = SLI4_LINK_STATUS_MAX;
        hw->link.topology = SLI4_LINK_TOPO_NONE;
        hw->link.medium = SLI4_LINK_MEDIUM_MAX;
        hw->link.speed = 0;
        hw->link.loop_map = NULL;
        hw->link.fc_id = U32_MAX;

        return 0;
}

static int
efct_hw_read_max_dump_size(struct efct_hw *hw)
{
        u8 buf[SLI4_BMBX_SIZE];
        struct efct *efct = hw->os;
        int rc = 0;
        struct sli4_rsp_cmn_set_dump_location *rsp;

        /* attempt to detemine the dump size for function 0 only. */
        if (PCI_FUNC(efct->pci->devfn) != 0)
                return rc;

        if (sli_cmd_common_set_dump_location(&hw->sli, buf, 1, 0, NULL, 0))
                return -EIO;

        rsp = (struct sli4_rsp_cmn_set_dump_location *)
              (buf + offsetof(struct sli4_cmd_sli_config, payload.embed));

        rc = efct_hw_command(hw, buf, EFCT_CMD_POLL, NULL, NULL);
        if (rc != 0) {
                efc_log_debug(hw->os, "set dump location cmd failed\n");
                return rc;
        }

        hw->dump_size =
          le32_to_cpu(rsp->buffer_length_dword) & SLI4_CMN_SET_DUMP_BUFFER_LEN;

        efc_log_debug(hw->os, "Dump size %x\n", hw->dump_size);

        return rc;
}

static int
__efct_read_topology_cb(struct efct_hw *hw, int status, u8 *mqe, void *arg)
{
        struct sli4_cmd_read_topology *read_topo =
                                (struct sli4_cmd_read_topology *)mqe;
        u8 speed;
        struct efc_domain_record drec = {0};
        struct efct *efct = hw->os;

        if (status || le16_to_cpu(read_topo->hdr.status)) {
                efc_log_debug(hw->os, "bad status cqe=%#x mqe=%#x\n", status,
                              le16_to_cpu(read_topo->hdr.status));
                return -EIO;
        }

        switch (le32_to_cpu(read_topo->dw2_attentype) &
                SLI4_READTOPO_ATTEN_TYPE) {
        case SLI4_READ_TOPOLOGY_LINK_UP:
                hw->link.status = SLI4_LINK_STATUS_UP;
                break;
        case SLI4_READ_TOPOLOGY_LINK_DOWN:
                hw->link.status = SLI4_LINK_STATUS_DOWN;
                break;
        case SLI4_READ_TOPOLOGY_LINK_NO_ALPA:
                hw->link.status = SLI4_LINK_STATUS_NO_ALPA;
                break;
        default:
                hw->link.status = SLI4_LINK_STATUS_MAX;
                break;
        }

        switch (read_topo->topology) {
        case SLI4_READ_TOPO_NON_FC_AL:
                hw->link.topology = SLI4_LINK_TOPO_NON_FC_AL;
                break;
        case SLI4_READ_TOPO_FC_AL:
                hw->link.topology = SLI4_LINK_TOPO_FC_AL;
                if (hw->link.status == SLI4_LINK_STATUS_UP)
                        hw->link.loop_map = hw->loop_map.virt;
                hw->link.fc_id = read_topo->acquired_al_pa;
                break;
        default:
                hw->link.topology = SLI4_LINK_TOPO_MAX;
                break;
        }

        hw->link.medium = SLI4_LINK_MEDIUM_FC;

        speed = (le32_to_cpu(read_topo->currlink_state) &
                 SLI4_READTOPO_LINKSTATE_SPEED) >> 8;
        switch (speed) {
        case SLI4_READ_TOPOLOGY_SPEED_1G:
                hw->link.speed =  1 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_2G:
                hw->link.speed =  2 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_4G:
                hw->link.speed =  4 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_8G:
                hw->link.speed =  8 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_16G:
                hw->link.speed = 16 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_32G:
                hw->link.speed = 32 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_64G:
                hw->link.speed = 64 * 1000;
                break;
        case SLI4_READ_TOPOLOGY_SPEED_128G:
                hw->link.speed = 128 * 1000;
                break;
        }

        drec.speed = hw->link.speed;
        drec.fc_id = hw->link.fc_id;
        drec.is_nport = true;
        efc_domain_cb(efct->efcport, EFC_HW_DOMAIN_FOUND, &drec);

        return 0;
}

static int
efct_hw_cb_link(void *ctx, void *e)
{
        struct efct_hw *hw = ctx;
        struct sli4_link_event *event = e;
        struct efc_domain *d = NULL;
        int rc = 0;
        struct efct *efct = hw->os;

        efct_hw_link_event_init(hw);

        switch (event->status) {
        case SLI4_LINK_STATUS_UP:

                hw->link = *event;
                efct->efcport->link_status = EFC_LINK_STATUS_UP;

                if (event->topology == SLI4_LINK_TOPO_NON_FC_AL) {
                        struct efc_domain_record drec = {0};

                        efc_log_info(hw->os, "Link Up, NPORT, speed is %d\n",
                                     event->speed);
                        drec.speed = event->speed;
                        drec.fc_id = event->fc_id;
                        drec.is_nport = true;
                        efc_domain_cb(efct->efcport, EFC_HW_DOMAIN_FOUND,
                                      &drec);
                } else if (event->topology == SLI4_LINK_TOPO_FC_AL) {
                        u8 buf[SLI4_BMBX_SIZE];

                        efc_log_info(hw->os, "Link Up, LOOP, speed is %d\n",
                                     event->speed);

                        if (!sli_cmd_read_topology(&hw->sli, buf,
                                                   &hw->loop_map)) {
                                rc = efct_hw_command(hw, buf, EFCT_CMD_NOWAIT,
                                                __efct_read_topology_cb, NULL);
                        }

                        if (rc)
                                efc_log_debug(hw->os, "READ_TOPOLOGY failed\n");
                } else {
                        efc_log_info(hw->os, "%s(%#x), speed is %d\n",
                                     "Link Up, unsupported topology ",
                                     event->topology, event->speed);
                }
                break;
        case SLI4_LINK_STATUS_DOWN:
                efc_log_info(hw->os, "Link down\n");

                hw->link.status = event->status;
                efct->efcport->link_status = EFC_LINK_STATUS_DOWN;

                d = efct->efcport->domain;
                if (d)
                        efc_domain_cb(efct->efcport, EFC_HW_DOMAIN_LOST, d);
                break;
        default:
                efc_log_debug(hw->os, "unhandled link status %#x\n",
                              event->status);
                break;
        }

        return 0;
}

int
efct_hw_setup(struct efct_hw *hw, void *os, struct pci_dev *pdev)
{
        u32 i, max_sgl, cpus;

        if (hw->hw_setup_called)
                return 0;

        /*
         * efct_hw_init() relies on NULL pointers indicating that a structure
         * needs allocation. If a structure is non-NULL, efct_hw_init() won't
         * free/realloc that memory
         */
        memset(hw, 0, sizeof(struct efct_hw));

        hw->hw_setup_called = true;

        hw->os = os;

        mutex_init(&hw->bmbx_lock);
        spin_lock_init(&hw->cmd_lock);
        INIT_LIST_HEAD(&hw->cmd_head);
        INIT_LIST_HEAD(&hw->cmd_pending);
        hw->cmd_head_count = 0;

        /* Create mailbox command ctx pool */
        hw->cmd_ctx_pool = mempool_create_kmalloc_pool(EFCT_CMD_CTX_POOL_SZ,
                                        sizeof(struct efct_command_ctx));
        if (!hw->cmd_ctx_pool) {
                efc_log_err(hw->os, "failed to allocate mailbox buffer pool\n");
                return -EIO;
        }

        /* Create mailbox request ctx pool for library callback */
        hw->mbox_rqst_pool = mempool_create_kmalloc_pool(EFCT_CMD_CTX_POOL_SZ,
                                        sizeof(struct efct_mbox_rqst_ctx));
        if (!hw->mbox_rqst_pool) {
                efc_log_err(hw->os, "failed to allocate mbox request pool\n");
                return -EIO;
        }

        spin_lock_init(&hw->io_lock);
        INIT_LIST_HEAD(&hw->io_inuse);
        INIT_LIST_HEAD(&hw->io_free);
        INIT_LIST_HEAD(&hw->io_wait_free);

        atomic_set(&hw->io_alloc_failed_count, 0);

        hw->config.speed = SLI4_LINK_SPEED_AUTO_16_8_4;
        if (sli_setup(&hw->sli, hw->os, pdev, ((struct efct *)os)->reg)) {
                efc_log_err(hw->os, "SLI setup failed\n");
                return -EIO;
        }

        efct_hw_link_event_init(hw);

        sli_callback(&hw->sli, SLI4_CB_LINK, efct_hw_cb_link, hw);

        /*
         * Set all the queue sizes to the maximum allowed.
         */
        for (i = 0; i < ARRAY_SIZE(hw->num_qentries); i++)
                hw->num_qentries[i] = hw->sli.qinfo.max_qentries[i];
        /*
         * Adjust the size of the WQs so that the CQ is twice as big as
         * the WQ to allow for 2 completions per IO. This allows us to
         * handle multi-phase as well as aborts.
         */
        hw->num_qentries[SLI4_QTYPE_WQ] = hw->num_qentries[SLI4_QTYPE_CQ] / 2;

        /*
         * The RQ assignment for RQ pair mode.
         */

        hw->config.rq_default_buffer_size = EFCT_HW_RQ_SIZE_PAYLOAD;
        hw->config.n_io = hw->sli.ext[SLI4_RSRC_XRI].size;

        cpus = num_possible_cpus();
        hw->config.n_eq = cpus > EFCT_HW_MAX_NUM_EQ ? EFCT_HW_MAX_NUM_EQ : cpus;

        max_sgl = sli_get_max_sgl(&hw->sli) - SLI4_SGE_MAX_RESERVED;
        max_sgl = (max_sgl > EFCT_FC_MAX_SGL) ? EFCT_FC_MAX_SGL : max_sgl;
        hw->config.n_sgl = max_sgl;

        (void)efct_hw_read_max_dump_size(hw);

        return 0;
}

static void
efct_logfcfi(struct efct_hw *hw, u32 j, u32 i, u32 id)
{
        efc_log_info(hw->os,
                     "REG_FCFI: filter[%d] %08X -> RQ[%d] id=%d\n",
                     j, hw->config.filter_def[j], i, id);
}

static inline void
efct_hw_init_free_io(struct efct_hw_io *io)
{
        /*
         * Set io->done to NULL, to avoid any callbacks, should
         * a completion be received for one of these IOs
         */
        io->done = NULL;
        io->abort_done = NULL;
        io->status_saved = false;
        io->abort_in_progress = false;
        io->type = 0xFFFF;
        io->wq = NULL;
}

static bool efct_hw_iotype_is_originator(u16 io_type)
{
        switch (io_type) {
        case EFCT_HW_FC_CT:
        case EFCT_HW_ELS_REQ:
                return true;
        default:
                return false;
        }
}

static void
efct_hw_io_restore_sgl(struct efct_hw *hw, struct efct_hw_io *io)
{
        /* Restore the default */
        io->sgl = &io->def_sgl;
        io->sgl_count = io->def_sgl_count;
}

static void
efct_hw_wq_process_io(void *arg, u8 *cqe, int status)
{
        struct efct_hw_io *io = arg;
        struct efct_hw *hw = io->hw;
        struct sli4_fc_wcqe *wcqe = (void *)cqe;
        u32     len = 0;
        u32 ext = 0;

        /* clear xbusy flag if WCQE[XB] is clear */
        if (io->xbusy && (wcqe->flags & SLI4_WCQE_XB) == 0)
                io->xbusy = false;

        /* get extended CQE status */
        switch (io->type) {
        case EFCT_HW_BLS_ACC:
        case EFCT_HW_BLS_RJT:
                break;
        case EFCT_HW_ELS_REQ:
                sli_fc_els_did(&hw->sli, cqe, &ext);
                len = sli_fc_response_length(&hw->sli, cqe);
                break;
        case EFCT_HW_ELS_RSP:
        case EFCT_HW_FC_CT_RSP:
                break;
        case EFCT_HW_FC_CT:
                len = sli_fc_response_length(&hw->sli, cqe);
                break;
        case EFCT_HW_IO_TARGET_WRITE:
                len = sli_fc_io_length(&hw->sli, cqe);
                break;
        case EFCT_HW_IO_TARGET_READ:
                len = sli_fc_io_length(&hw->sli, cqe);
                break;
        case EFCT_HW_IO_TARGET_RSP:
                break;
        case EFCT_HW_IO_DNRX_REQUEUE:
                /* release the count for re-posting the buffer */
                /* efct_hw_io_free(hw, io); */
                break;
        default:
                efc_log_err(hw->os, "unhandled io type %#x for XRI 0x%x\n",
                            io->type, io->indicator);
                break;
        }
        if (status) {
                ext = sli_fc_ext_status(&hw->sli, cqe);
                /*
                 * If we're not an originator IO, and XB is set, then issue
                 * abort for the IO from within the HW
                 */
                if (efct_hw_iotype_is_originator(io->type) &&
                    wcqe->flags & SLI4_WCQE_XB) {
                        int rc;

                        efc_log_debug(hw->os, "aborting xri=%#x tag=%#x\n",
                                      io->indicator, io->reqtag);

                        /*
                         * Because targets may send a response when the IO
                         * completes using the same XRI, we must wait for the
                         * XRI_ABORTED CQE to issue the IO callback
                         */
                        rc = efct_hw_io_abort(hw, io, false, NULL, NULL);
                        if (rc == 0) {
                                /*
                                 * latch status to return after abort is
                                 * complete
                                 */
                                io->status_saved = true;
                                io->saved_status = status;
                                io->saved_ext = ext;
                                io->saved_len = len;
                                goto exit_efct_hw_wq_process_io;
                        } else if (rc == -EINPROGRESS) {
                                /*
                                 * Already being aborted by someone else (ABTS
                                 * perhaps). Just return original
                                 * error.
                                 */
                                efc_log_debug(hw->os, "%s%#x tag=%#x\n",
                                              "abort in progress xri=",
                                              io->indicator, io->reqtag);

                        } else {
                                /* Failed to abort for some other reason, log
                                 * error
                                 */
                                efc_log_debug(hw->os, "%s%#x tag=%#x rc=%d\n",
                                              "Failed to abort xri=",
                                              io->indicator, io->reqtag, rc);
                        }
                }
        }

        if (io->done) {
                efct_hw_done_t done = io->done;

                io->done = NULL;

                if (io->status_saved) {
                        /* use latched status if exists */
                        status = io->saved_status;
                        len = io->saved_len;
                        ext = io->saved_ext;
                        io->status_saved = false;
                }

                /* Restore default SGL */
                efct_hw_io_restore_sgl(hw, io);
                done(io, len, status, ext, io->arg);
        }

exit_efct_hw_wq_process_io:
        return;
}

static int
efct_hw_setup_io(struct efct_hw *hw)
{
        u32     i = 0;
        struct efct_hw_io       *io = NULL;
        uintptr_t       xfer_virt = 0;
        uintptr_t       xfer_phys = 0;
        u32     index;
        bool new_alloc = true;
        struct efc_dma *dma;
        struct efct *efct = hw->os;

        if (!hw->io) {
                hw->io = kmalloc_array(hw->config.n_io, sizeof(io), GFP_KERNEL);
                if (!hw->io)
                        return -ENOMEM;

                memset(hw->io, 0, hw->config.n_io * sizeof(io));

                for (i = 0; i < hw->config.n_io; i++) {
                        hw->io[i] = kzalloc(sizeof(*io), GFP_KERNEL);
                        if (!hw->io[i])
                                goto error;
                }

                /* Create WQE buffs for IO */
                hw->wqe_buffs = kzalloc((hw->config.n_io * hw->sli.wqe_size),
                                        GFP_KERNEL);
                if (!hw->wqe_buffs) {
                        kfree(hw->io);
                        return -ENOMEM;
                }

        } else {
                /* re-use existing IOs, including SGLs */
                new_alloc = false;
        }

        if (new_alloc) {
                dma = &hw->xfer_rdy;
                dma->size = sizeof(struct fcp_txrdy) * hw->config.n_io;
                dma->virt = dma_alloc_coherent(&efct->pci->dev,
                                               dma->size, &dma->phys, GFP_DMA);
                if (!dma->virt)
                        return -ENOMEM;
        }
        xfer_virt = (uintptr_t)hw->xfer_rdy.virt;
        xfer_phys = hw->xfer_rdy.phys;

        /* Initialize the pool of HW IO objects */
        for (i = 0; i < hw->config.n_io; i++) {
                struct hw_wq_callback *wqcb;

                io = hw->io[i];

                /* initialize IO fields */
                io->hw = hw;

                /* Assign a WQE buff */
                io->wqe.wqebuf = &hw->wqe_buffs[i * hw->sli.wqe_size];

                /* Allocate the request tag for this IO */
                wqcb = efct_hw_reqtag_alloc(hw, efct_hw_wq_process_io, io);
                if (!wqcb) {
                        efc_log_err(hw->os, "can't allocate request tag\n");
                        return -ENOSPC;
                }
                io->reqtag = wqcb->instance_index;

                /* Now for the fields that are initialized on each free */
                efct_hw_init_free_io(io);

                /* The XB flag isn't cleared on IO free, so init to zero */
                io->xbusy = 0;

                if (sli_resource_alloc(&hw->sli, SLI4_RSRC_XRI,
                                       &io->indicator, &index)) {
                        efc_log_err(hw->os,
                                    "sli_resource_alloc failed @ %d\n", i);
                        return -ENOMEM;
                }

                if (new_alloc) {
                        dma = &io->def_sgl;
                        dma->size = hw->config.n_sgl *
                                        sizeof(struct sli4_sge);
                        dma->virt = dma_alloc_coherent(&efct->pci->dev,
                                                       dma->size, &dma->phys,
                                                       GFP_DMA);
                        if (!dma->virt) {
                                efc_log_err(hw->os, "dma_alloc fail %d\n", i);
                                memset(&io->def_sgl, 0,
                                       sizeof(struct efc_dma));
                                return -ENOMEM;
                        }
                }
                io->def_sgl_count = hw->config.n_sgl;
                io->sgl = &io->def_sgl;
                io->sgl_count = io->def_sgl_count;

                if (hw->xfer_rdy.size) {
                        io->xfer_rdy.virt = (void *)xfer_virt;
                        io->xfer_rdy.phys = xfer_phys;
                        io->xfer_rdy.size = sizeof(struct fcp_txrdy);

                        xfer_virt += sizeof(struct fcp_txrdy);
                        xfer_phys += sizeof(struct fcp_txrdy);
                }
        }

        return 0;
error:
        for (i = 0; i < hw->config.n_io && hw->io[i]; i++) {
                kfree(hw->io[i]);
                hw->io[i] = NULL;
        }

        kfree(hw->io);
        hw->io = NULL;

        return -ENOMEM;
}

static int
efct_hw_init_prereg_io(struct efct_hw *hw)
{
        u32 i, idx = 0;
        struct efct_hw_io *io = NULL;
        u8 cmd[SLI4_BMBX_SIZE];
        int rc = 0;
        u32 n_rem;
        u32 n = 0;
        u32 sgls_per_request = 256;
        struct efc_dma **sgls = NULL;
        struct efc_dma req;
        struct efct *efct = hw->os;

        sgls = kmalloc_array(sgls_per_request, sizeof(*sgls), GFP_KERNEL);
        if (!sgls)
                return -ENOMEM;

        memset(&req, 0, sizeof(struct efc_dma));
        req.size = 32 + sgls_per_request * 16;
        req.virt = dma_alloc_coherent(&efct->pci->dev, req.size, &req.phys,
                                      GFP_DMA);
        if (!req.virt) {
                kfree(sgls);
                return -ENOMEM;
        }

        for (n_rem = hw->config.n_io; n_rem; n_rem -= n) {
                /* Copy address of SGL's into local sgls[] array, break
                 * out if the xri is not contiguous.
                 */
                u32 min = (sgls_per_request < n_rem) ? sgls_per_request : n_rem;

                for (n = 0; n < min; n++) {
                        /* Check that we have contiguous xri values */
                        if (n > 0) {
                                if (hw->io[idx + n]->indicator !=
                                    hw->io[idx + n - 1]->indicator + 1)
                                        break;
                        }

                        sgls[n] = hw->io[idx + n]->sgl;
                }

                if (sli_cmd_post_sgl_pages(&hw->sli, cmd,
                                hw->io[idx]->indicator, n, sgls, NULL, &req)) {
                        rc = -EIO;
                        break;
                }

                rc = efct_hw_command(hw, cmd, EFCT_CMD_POLL, NULL, NULL);
                if (rc) {
                        efc_log_err(hw->os, "SGL post failed, rc=%d\n", rc);
                        break;
                }

                /* Add to tail if successful */
                for (i = 0; i < n; i++, idx++) {
                        io = hw->io[idx];
                        io->state = EFCT_HW_IO_STATE_FREE;
                        INIT_LIST_HEAD(&io->list_entry);
                        list_add_tail(&io->list_entry, &hw->io_free);
                }
        }

        dma_free_coherent(&efct->pci->dev, req.size, req.virt, req.phys);
        memset(&req, 0, sizeof(struct efc_dma));
        kfree(sgls);

        return rc;
}

static int
efct_hw_init_io(struct efct_hw *hw)
{
        u32 i, idx = 0;
        bool prereg = false;
        struct efct_hw_io *io = NULL;
        int rc = 0;

        prereg = hw->sli.params.sgl_pre_registered;

        if (prereg)
                return efct_hw_init_prereg_io(hw);

        for (i = 0; i < hw->config.n_io; i++, idx++) {
                io = hw->io[idx];
                io->state = EFCT_HW_IO_STATE_FREE;
                INIT_LIST_HEAD(&io->list_entry);
                list_add_tail(&io->list_entry, &hw->io_free);
        }

        return rc;
}

static int
efct_hw_config_set_fdt_xfer_hint(struct efct_hw *hw, u32 fdt_xfer_hint)
{
        int rc = 0;
        u8 buf[SLI4_BMBX_SIZE];
        struct sli4_rqst_cmn_set_features_set_fdt_xfer_hint param;

        memset(&param, 0, sizeof(param));
        param.fdt_xfer_hint = cpu_to_le32(fdt_xfer_hint);
        /* build the set_features command */
        sli_cmd_common_set_features(&hw->sli, buf,
                SLI4_SET_FEATURES_SET_FTD_XFER_HINT, sizeof(param), &param);

        rc = efct_hw_command(hw, buf, EFCT_CMD_POLL, NULL, NULL);
        if (rc)
                efc_log_warn(hw->os, "set FDT hint %d failed: %d\n",
                             fdt_xfer_hint, rc);
        else
                efc_log_info(hw->os, "Set FTD transfer hint to %d\n",
                             le32_to_cpu(param.fdt_xfer_hint));

        return rc;
}

static int
efct_hw_config_rq(struct efct_hw *hw)
{
        u32 min_rq_count, i, rc;
        struct sli4_cmd_rq_cfg rq_cfg[SLI4_CMD_REG_FCFI_NUM_RQ_CFG];
        u8 buf[SLI4_BMBX_SIZE];

        efc_log_info(hw->os, "using REG_FCFI standard\n");

        /*
         * Set the filter match/mask values from hw's
         * filter_def values
         */
        for (i = 0; i < SLI4_CMD_REG_FCFI_NUM_RQ_CFG; i++) {
                rq_cfg[i].rq_id = cpu_to_le16(0xffff);
                rq_cfg[i].r_ctl_mask = (u8)hw->config.filter_def[i];
                rq_cfg[i].r_ctl_match = (u8)(hw->config.filter_def[i] >> 8);
                rq_cfg[i].type_mask = (u8)(hw->config.filter_def[i] >> 16);
                rq_cfg[i].type_match = (u8)(hw->config.filter_def[i] >> 24);
        }

        /*
         * Update the rq_id's of the FCF configuration
         * (don't update more than the number of rq_cfg
         * elements)
         */
        min_rq_count = (hw->hw_rq_count < SLI4_CMD_REG_FCFI_NUM_RQ_CFG) ?
                        hw->hw_rq_count : SLI4_CMD_REG_FCFI_NUM_RQ_CFG;
        for (i = 0; i < min_rq_count; i++) {
                struct hw_rq *rq = hw->hw_rq[i];
                u32 j;

                for (j = 0; j < SLI4_CMD_REG_FCFI_NUM_RQ_CFG; j++) {
                        u32 mask = (rq->filter_mask != 0) ?
                                rq->filter_mask : 1;

                        if (!(mask & (1U << j)))
                                continue;

                        rq_cfg[i].rq_id = cpu_to_le16(rq->hdr->id);
                        efct_logfcfi(hw, j, i, rq->hdr->id);
                }
        }

        rc = -EIO;
        if (!sli_cmd_reg_fcfi(&hw->sli, buf, 0, rq_cfg))
                rc = efct_hw_command(hw, buf, EFCT_CMD_POLL, NULL, NULL);

        if (rc != 0) {
                efc_log_err(hw->os, "FCFI registration failed\n");
                return rc;
        }
        hw->fcf_indicator =
                le16_to_cpu(((struct sli4_cmd_reg_fcfi *)buf)->fcfi);

        return rc;
}

static int
efct_hw_config_mrq(struct efct_hw *hw, u8 mode, u16 fcf_index)
{
        u8 buf[SLI4_BMBX_SIZE], mrq_bitmask = 0;
        struct hw_rq *rq;
        struct sli4_cmd_reg_fcfi_mrq *rsp = NULL;
        struct sli4_cmd_rq_cfg rq_filter[SLI4_CMD_REG_FCFI_MRQ_NUM_RQ_CFG];
        u32 rc, i;

        if (mode == SLI4_CMD_REG_FCFI_SET_FCFI_MODE)
                goto issue_cmd;

        /* Set the filter match/mask values from hw's filter_def values */
        for (i = 0; i < SLI4_CMD_REG_FCFI_NUM_RQ_CFG; i++) {
                rq_filter[i].rq_id = cpu_to_le16(0xffff);
                rq_filter[i].type_mask = (u8)hw->config.filter_def[i];
                rq_filter[i].type_match = (u8)(hw->config.filter_def[i] >> 8);
                rq_filter[i].r_ctl_mask = (u8)(hw->config.filter_def[i] >> 16);
                rq_filter[i].r_ctl_match = (u8)(hw->config.filter_def[i] >> 24);
        }

        rq = hw->hw_rq[0];
        rq_filter[0].rq_id = cpu_to_le16(rq->hdr->id);
        rq_filter[1].rq_id = cpu_to_le16(rq->hdr->id);

        mrq_bitmask = 0x2;
issue_cmd:
        efc_log_debug(hw->os, "Issue reg_fcfi_mrq count:%d policy:%d mode:%d\n",
                      hw->hw_rq_count, hw->config.rq_selection_policy, mode);
        /* Invoke REG_FCFI_MRQ */
        rc = sli_cmd_reg_fcfi_mrq(&hw->sli, buf, mode, fcf_index,
                                  hw->config.rq_selection_policy, mrq_bitmask,
                                  hw->hw_mrq_count, rq_filter);
        if (rc) {
                efc_log_err(hw->os, "sli_cmd_reg_fcfi_mrq() failed\n");
                return -EIO;
        }

        rc = efct_hw_command(hw, buf, EFCT_CMD_POLL, NULL, NULL);

        rsp = (struct sli4_cmd_reg_fcfi_mrq *)buf;

        if ((rc) || (le16_to_cpu(rsp->hdr.status))) {
                efc_log_err(hw->os, "FCFI MRQ reg failed. cmd=%x status=%x\n",
                            rsp->hdr.command, le16_to_cpu(rsp->hdr.status));
                return -EIO;
        }

        if (mode == SLI4_CMD_REG_FCFI_SET_FCFI_MODE)
                hw->fcf_indicator = le16_to_cpu(rsp->fcfi);

        return 0;
}

static void
efct_hw_queue_hash_add(struct efct_queue_hash *hash,
                       u16 id, u16 index)
{
        u32 hash_index = id & (EFCT_HW_Q_HASH_SIZE - 1);

        /*
         * Since the hash is always bigger than the number of queues, then we
         * never have to worry about an infinite loop.
         */
        while (hash[hash_index].in_use)
                hash_index = (hash_index + 1) & (EFCT_HW_Q_HASH_SIZE - 1);

        /* not used, claim the entry */
        hash[hash_index].id = id;
        hash[hash_index].in_use = true;
        hash[hash_index].index = index;
}

static int
efct_hw_config_sli_port_health_check(struct efct_hw *hw, u8 query, u8 enable)
{
        int rc = 0;
        u8 buf[SLI4_BMBX_SIZE];
        struct sli4_rqst_cmn_set_features_health_check param;
        u32 health_check_flag = 0;

        memset(&param, 0, sizeof(param));

        if (enable)
                health_check_flag |= SLI4_RQ_HEALTH_CHECK_ENABLE;

        if (query)
                health_check_flag |= SLI4_RQ_HEALTH_CHECK_QUERY;

        param.health_check_dword = cpu_to_le32(health_check_flag);

        /* build the set_features command */
        sli_cmd_common_set_features(&hw->sli, buf,
                SLI4_SET_FEATURES_SLI_PORT_HEALTH_CHECK, sizeof(param), &param);

        rc = efct_hw_command(hw, buf, EFCT_CMD_POLL, NULL, NULL);
        if (rc)
                efc_log_err(hw->os, "efct_hw_command returns %d\n", rc);
        else
                efc_log_debug(hw->os, "SLI Port Health Check is enabled\n");

        return rc;
}

int
efct_hw_init(struct efct_hw *hw)
{
        int rc;
        u32 i = 0;
        int rem_count;
        unsigned long flags = 0;
        struct efct_hw_io *temp;
        struct efc_dma *dma;

        /*
         * Make sure the command lists are empty. If this is start-of-day,
         * they'll be empty since they were just initialized in efct_hw_setup.
         * If we've just gone through a reset, the command and command pending
         * lists should have been cleaned up as part of the reset
         * (efct_hw_reset()).
         */
        spin_lock_irqsave(&hw->cmd_lock, flags);
        if (!list_empty(&hw->cmd_head)) {
                spin_unlock_irqrestore(&hw->cmd_lock, flags);
                efc_log_err(hw->os, "command found on cmd list\n");
                return -EIO;
        }
        if (!list_empty(&hw->cmd_pending)) {
                spin_unlock_irqrestore(&hw->cmd_lock, flags);
                efc_log_err(hw->os, "command found on pending list\n");
                return -EIO;
        }
        spin_unlock_irqrestore(&hw->cmd_lock, flags);

        /* Free RQ buffers if prevously allocated */
        efct_hw_rx_free(hw);

        /*
         * The IO queues must be initialized here for the reset case. The
         * efct_hw_init_io() function will re-add the IOs to the free list.
         * The cmd_head list should be OK since we free all entries in
         * efct_hw_command_cancel() that is called in the efct_hw_reset().
         */

        /* If we are in this function due to a reset, there may be stale items
         * on lists that need to be removed.  Clean them up.
         */
        rem_count = 0;
        while ((!list_empty(&hw->io_wait_free))) {
                rem_count++;
                temp = list_first_entry(&hw->io_wait_free, struct efct_hw_io,
                                        list_entry);
                list_del_init(&temp->list_entry);
        }
        if (rem_count > 0)
                efc_log_debug(hw->os, "rmvd %d items from io_wait_free list\n",
                              rem_count);

        rem_count = 0;
        while ((!list_empty(&hw->io_inuse))) {
                rem_count++;
                temp = list_first_entry(&hw->io_inuse, struct efct_hw_io,
                                        list_entry);
                list_del_init(&temp->list_entry);
        }
        if (rem_count > 0)
                efc_log_debug(hw->os, "rmvd %d items from io_inuse list\n",
                              rem_count);

        rem_count = 0;
        while ((!list_empty(&hw->io_free))) {
                rem_count++;
                temp = list_first_entry(&hw->io_free, struct efct_hw_io,
                                        list_entry);
                list_del_init(&temp->list_entry);
        }
        if (rem_count > 0)
                efc_log_debug(hw->os, "rmvd %d items from io_free list\n",
                              rem_count);

        /* If MRQ not required, Make sure we dont request feature. */
        if (hw->config.n_rq == 1)
                hw->sli.features &= (~SLI4_REQFEAT_MRQP);

        if (sli_init(&hw->sli)) {
                efc_log_err(hw->os, "SLI failed to initialize\n");
                return -EIO;
        }

        if (hw->sliport_healthcheck) {
                rc = efct_hw_config_sli_port_health_check(hw, 0, 1);
                if (rc != 0) {
                        efc_log_err(hw->os, "Enable port Health check fail\n");
                        return rc;
                }
        }

        /*
         * Set FDT transfer hint, only works on Lancer
         */
        if (hw->sli.if_type == SLI4_INTF_IF_TYPE_2) {
                /*
                 * Non-fatal error. In particular, we can disregard failure to
                 * set EFCT_HW_FDT_XFER_HINT on devices with legacy firmware
                 * that do not support EFCT_HW_FDT_XFER_HINT feature.
                 */
                efct_hw_config_set_fdt_xfer_hint(hw, EFCT_HW_FDT_XFER_HINT);
        }

        /* zero the hashes */
        memset(hw->cq_hash, 0, sizeof(hw->cq_hash));
        efc_log_debug(hw->os, "Max CQs %d, hash size = %d\n",
                      EFCT_HW_MAX_NUM_CQ, EFCT_HW_Q_HASH_SIZE);

        memset(hw->rq_hash, 0, sizeof(hw->rq_hash));
        efc_log_debug(hw->os, "Max RQs %d, hash size = %d\n",
                      EFCT_HW_MAX_NUM_RQ, EFCT_HW_Q_HASH_SIZE);

        memset(hw->wq_hash, 0, sizeof(hw->wq_hash));
        efc_log_debug(hw->os, "Max WQs %d, hash size = %d\n",
                      EFCT_HW_MAX_NUM_WQ, EFCT_HW_Q_HASH_SIZE);

        rc = efct_hw_init_queues(hw);
        if (rc)

                return rc;

        rc = efct_hw_map_wq_cpu(hw);
        if (rc)
                return rc;

        /* Allocate and p_st RQ buffers */
        rc = efct_hw_rx_allocate(hw);
        if (rc) {
                efc_log_err(hw->os, "rx_allocate failed\n");
                return rc;
        }

        rc = efct_hw_rx_post(hw);
        if (rc) {
                efc_log_err(hw->os, "WARNING - error posting RQ buffers\n");
                return rc;
        }

        if (hw->config.n_eq == 1) {
                rc = efct_hw_config_rq(hw);
                if (rc) {
                        efc_log_err(hw->os, "config rq failed %d\n", rc);
                        return rc;
                }
        } else {
                rc = efct_hw_config_mrq(hw, SLI4_CMD_REG_FCFI_SET_FCFI_MODE, 0);
                if (rc != 0) {
                        efc_log_err(hw->os, "REG_FCFI_MRQ FCFI reg failed\n");
                        return rc;
                }

                rc = efct_hw_config_mrq(hw, SLI4_CMD_REG_FCFI_SET_MRQ_MODE, 0);
                if (rc != 0) {
                        efc_log_err(hw->os, "REG_FCFI_MRQ MRQ reg failed\n");
                        return rc;
                }
        }

        /*
         * Allocate the WQ request tag pool, if not previously allocated
         * (the request tag value is 16 bits, thus the pool allocation size
         * of 64k)
         */
        hw->wq_reqtag_pool = efct_hw_reqtag_pool_alloc(hw);
        if (!hw->wq_reqtag_pool) {
                efc_log_err(hw->os, "efct_hw_reqtag_pool_alloc failed\n");
                return -ENOMEM;
        }

        rc = efct_hw_setup_io(hw);
        if (rc) {
                efc_log_err(hw->os, "IO allocation failure\n");
                return rc;
        }

        rc = efct_hw_init_io(hw);
        if (rc) {
                efc_log_err(hw->os, "IO initialization failure\n");
                return rc;
        }

        dma = &hw->loop_map;
        dma->size = SLI4_MIN_LOOP_MAP_BYTES;
        dma->virt = dma_alloc_coherent(&hw->os->pci->dev, dma->size, &dma->phys,
                                       GFP_DMA);
        if (!dma->virt)
                return -EIO;

        /*
         * Arming the EQ allows (e.g.) interrupts when CQ completions write EQ
         * entries
         */
        for (i = 0; i < hw->eq_count; i++)
                sli_queue_arm(&hw->sli, &hw->eq[i], true);

        /*
         * Initialize RQ hash
         */
        for (i = 0; i < hw->rq_count; i++)
                efct_hw_queue_hash_add(hw->rq_hash, hw->rq[i].id, i);

        /*
         * Initialize WQ hash
         */
        for (i = 0; i < hw->wq_count; i++)
                efct_hw_queue_hash_add(hw->wq_hash, hw->wq[i].id, i);

        /*
         * Arming the CQ allows (e.g.) MQ completions to write CQ entries
         */
        for (i = 0; i < hw->cq_count; i++) {
                efct_hw_queue_hash_add(hw->cq_hash, hw->cq[i].id, i);
                sli_queue_arm(&hw->sli, &hw->cq[i], true);
        }

        /* Set RQ process limit*/
        for (i = 0; i < hw->hw_rq_count; i++) {
                struct hw_rq *rq = hw->hw_rq[i];

                hw->cq[rq->cq->instance].proc_limit = hw->config.n_io / 2;
        }

        /* record the fact that the queues are functional */
        hw->state = EFCT_HW_STATE_ACTIVE;
        /*
         * Allocate a HW IOs for send frame.
         */
        hw->hw_wq[0]->send_frame_io = efct_hw_io_alloc(hw);
        if (!hw->hw_wq[0]->send_frame_io)
                efc_log_err(hw->os, "alloc for send_frame_io failed\n");

        /* Initialize send frame sequence id */
        atomic_set(&hw->send_frame_seq_id, 0);

        return 0;
}

int
efct_hw_parse_filter(struct efct_hw *hw, void *value)
{
        int rc = 0;
        char *p = NULL;
        char *token;
        u32 idx = 0;

        for (idx = 0; idx < ARRAY_SIZE(hw->config.filter_def); idx++)
                hw->config.filter_def[idx] = 0;

        p = kstrdup(value, GFP_KERNEL);
        if (!p || !*p) {
                efc_log_err(hw->os, "p is NULL\n");
                return -ENOMEM;
        }

        idx = 0;
        while ((token = strsep(&p, ",")) && *token) {
                if (kstrtou32(token, 0, &hw->config.filter_def[idx++]))
                        efc_log_err(hw->os, "kstrtoint failed\n");

                if (!p || !*p)
                        break;

                if (idx == ARRAY_SIZE(hw->config.filter_def))
                        break;
        }
        kfree(p);

        return rc;
}

u64
efct_get_wwnn(struct efct_hw *hw)
{
        struct sli4 *sli = &hw->sli;
        u8 p[8];

        memcpy(p, sli->wwnn, sizeof(p));
        return get_unaligned_be64(p);
}

u64
efct_get_wwpn(struct efct_hw *hw)
{
        struct sli4 *sli = &hw->sli;
        u8 p[8];

        memcpy(p, sli->wwpn, sizeof(p));
        return get_unaligned_be64(p);
}

static struct efc_hw_rq_buffer *
efct_hw_rx_buffer_alloc(struct efct_hw *hw, u32 rqindex, u32 count,
                        u32 size)
{
        struct efct *efct = hw->os;
        struct efc_hw_rq_buffer *rq_buf = NULL;
        struct efc_hw_rq_buffer *prq;
        u32 i;

        if (!count)
                return NULL;

        rq_buf = kmalloc_array(count, sizeof(*rq_buf), GFP_KERNEL);
        if (!rq_buf)
                return NULL;
        memset(rq_buf, 0, sizeof(*rq_buf) * count);

        for (i = 0, prq = rq_buf; i < count; i ++, prq++) {
                prq->rqindex = rqindex;
                prq->dma.size = size;
                prq->dma.virt = dma_alloc_coherent(&efct->pci->dev,
                                                   prq->dma.size,
                                                   &prq->dma.phys,
                                                   GFP_DMA);
                if (!prq->dma.virt) {
                        efc_log_err(hw->os, "DMA allocation failed\n");
                        kfree(rq_buf);
                        return NULL;
                }
        }
        return rq_buf;
}

static void
efct_hw_rx_buffer_free(struct efct_hw *hw,
                       struct efc_hw_rq_buffer *rq_buf,
                        u32 count)
{
        struct efct *efct = hw->os;
        u32 i;
        struct efc_hw_rq_buffer *prq;

        if (rq_buf) {
                for (i = 0, prq = rq_buf; i < count; i++, prq++) {
                        dma_free_coherent(&efct->pci->dev,
                                          prq->dma.size, prq->dma.virt,
                                          prq->dma.phys);
                        memset(&prq->dma, 0, sizeof(struct efc_dma));
                }

                kfree(rq_buf);
        }
}

int
efct_hw_rx_allocate(struct efct_hw *hw)
{
        struct efct *efct = hw->os;
        u32 i;
        int rc = 0;
        u32 rqindex = 0;
        u32 hdr_size = EFCT_HW_RQ_SIZE_HDR;
        u32 payload_size = hw->config.rq_default_buffer_size;

        rqindex = 0;

        for (i = 0; i < hw->hw_rq_count; i++) {
                struct hw_rq *rq = hw->hw_rq[i];

                /* Allocate header buffers */
                rq->hdr_buf = efct_hw_rx_buffer_alloc(hw, rqindex,
                                                      rq->entry_count,
                                                      hdr_size);
                if (!rq->hdr_buf) {
                        efc_log_err(efct, "rx_buffer_alloc hdr_buf failed\n");
                        rc = -EIO;
                        break;
                }

                efc_log_debug(hw->os,
                              "rq[%2d] rq_id %02d header  %4d by %4d bytes\n",
                              i, rq->hdr->id, rq->entry_count, hdr_size);

                rqindex++;

                /* Allocate payload buffers */
                rq->payload_buf = efct_hw_rx_buffer_alloc(hw, rqindex,
                                                          rq->entry_count,
                                                          payload_size);
                if (!rq->payload_buf) {
                        efc_log_err(efct, "rx_buffer_alloc fb_buf failed\n");
                        rc = -EIO;
                        break;
                }
                efc_log_debug(hw->os,
                              "rq[%2d] rq_id %02d default %4d by %4d bytes\n",
                              i, rq->data->id, rq->entry_count, payload_size);
                rqindex++;
        }

        return rc ? -EIO : 0;
}

int
efct_hw_rx_post(struct efct_hw *hw)
{
        u32 i;
        u32 idx;
        u32 rq_idx;
        int rc = 0;

        if (!hw->seq_pool) {
                u32 count = 0;

                for (i = 0; i < hw->hw_rq_count; i++)
                        count += hw->hw_rq[i]->entry_count;

                hw->seq_pool = kmalloc_array(count,
                                sizeof(struct efc_hw_sequence), GFP_KERNEL);
                if (!hw->seq_pool)
                        return -ENOMEM;
        }

        /*
         * In RQ pair mode, we MUST post the header and payload buffer at the
         * same time.
         */
        for (rq_idx = 0, idx = 0; rq_idx < hw->hw_rq_count; rq_idx++) {
                struct hw_rq *rq = hw->hw_rq[rq_idx];

                for (i = 0; i < rq->entry_count - 1; i++) {
                        struct efc_hw_sequence *seq;

                        seq = hw->seq_pool + idx;
                        idx++;
                        seq->header = &rq->hdr_buf[i];
                        seq->payload = &rq->payload_buf[i];
                        rc = efct_hw_sequence_free(hw, seq);
                        if (rc)
                                break;
                }
                if (rc)
                        break;
        }

        if (rc && hw->seq_pool)
                kfree(hw->seq_pool);

        return rc;
}

void
efct_hw_rx_free(struct efct_hw *hw)
{
        u32 i;

        /* Free hw_rq buffers */
        for (i = 0; i < hw->hw_rq_count; i++) {
                struct hw_rq *rq = hw->hw_rq[i];

                if (rq) {
                        efct_hw_rx_buffer_free(hw, rq->hdr_buf,
                                               rq->entry_count);
                        rq->hdr_buf = NULL;
                        efct_hw_rx_buffer_free(hw, rq->payload_buf,
                                               rq->entry_count);
                        rq->payload_buf = NULL;
                }
        }
}

static int
efct_hw_cmd_submit_pending(struct efct_hw *hw)
{
        int rc = 0;

        /* Assumes lock held */

        /* Only submit MQE if there's room */
        while (hw->cmd_head_count < (EFCT_HW_MQ_DEPTH - 1) &&
               !list_empty(&hw->cmd_pending)) {
                struct efct_command_ctx *ctx;

                ctx = list_first_entry(&hw->cmd_pending,
                                       struct efct_command_ctx, list_entry);
                if (!ctx)
                        break;

                list_del_init(&ctx->list_entry);

                list_add_tail(&ctx->list_entry, &hw->cmd_head);
                hw->cmd_head_count++;
                if (sli_mq_write(&hw->sli, hw->mq, ctx->buf) < 0) {
                        efc_log_debug(hw->os,
                                      "sli_queue_write failed: %d\n", rc);
                        rc = -EIO;
                        break;
                }
        }
        return rc;
}

int
efct_hw_command(struct efct_hw *hw, u8 *cmd, u32 opts, void *cb, void *arg)
{
        int rc = -EIO;
        unsigned long flags = 0;
        void *bmbx = NULL;

        /*
         * If the chip is in an error state (UE'd) then reject this mailbox
         * command.
         */
        if (sli_fw_error_status(&hw->sli) > 0) {
                efc_log_crit(hw->os, "Chip in an error state - reset needed\n");
                efc_log_crit(hw->os, "status=%#x error1=%#x error2=%#x\n",
                             sli_reg_read_status(&hw->sli),
                             sli_reg_read_err1(&hw->sli),
                             sli_reg_read_err2(&hw->sli));

                return -EIO;
        }

        /*
         * Send a mailbox command to the hardware, and either wait for
         * a completion (EFCT_CMD_POLL) or get an optional asynchronous
         * completion (EFCT_CMD_NOWAIT).
         */

        if (opts == EFCT_CMD_POLL) {
                mutex_lock(&hw->bmbx_lock);
                bmbx = hw->sli.bmbx.virt;

                memset(bmbx, 0, SLI4_BMBX_SIZE);
                memcpy(bmbx, cmd, SLI4_BMBX_SIZE);

                if (sli_bmbx_command(&hw->sli) == 0) {
                        rc = 0;
                        memcpy(cmd, bmbx, SLI4_BMBX_SIZE);
                }
                mutex_unlock(&hw->bmbx_lock);
        } else if (opts == EFCT_CMD_NOWAIT) {
                struct efct_command_ctx *ctx = NULL;

                if (hw->state != EFCT_HW_STATE_ACTIVE) {
                        efc_log_err(hw->os, "Can't send command, HW state=%d\n",
                                    hw->state);
                        return -EIO;
                }

                ctx = mempool_alloc(hw->cmd_ctx_pool, GFP_ATOMIC);
                if (!ctx)
                        return -ENOSPC;

                memset(ctx, 0, sizeof(struct efct_command_ctx));

                if (cb) {
                        ctx->cb = cb;
                        ctx->arg = arg;
                }

                memcpy(ctx->buf, cmd, SLI4_BMBX_SIZE);
                ctx->ctx = hw;

                spin_lock_irqsave(&hw->cmd_lock, flags);

                /* Add to pending list */
                INIT_LIST_HEAD(&ctx->list_entry);
                list_add_tail(&ctx->list_entry, &hw->cmd_pending);

                /* Submit as much of the pending list as we can */
                rc = efct_hw_cmd_submit_pending(hw);

                spin_unlock_irqrestore(&hw->cmd_lock, flags);
        }

        return rc;
}

static int
efct_hw_command_process(struct efct_hw *hw, int status, u8 *mqe,
                        size_t size)
{
        struct efct_command_ctx *ctx = NULL;
        unsigned long flags = 0;

        spin_lock_irqsave(&hw->cmd_lock, flags);
        if (!list_empty(&hw->cmd_head)) {
                ctx = list_first_entry(&hw->cmd_head,
                                       struct efct_command_ctx, list_entry);
                list_del_init(&ctx->list_entry);
        }
        if (!ctx) {
                efc_log_err(hw->os, "no command context\n");
                spin_unlock_irqrestore(&hw->cmd_lock, flags);
                return -EIO;
        }

        hw->cmd_head_count--;

        /* Post any pending requests */
        efct_hw_cmd_submit_pending(hw);

        spin_unlock_irqrestore(&hw->cmd_lock, flags);

        if (ctx->cb) {
                memcpy(ctx->buf, mqe, size);
                ctx->cb(hw, status, ctx->buf, ctx->arg);
        }

        mempool_free(ctx, hw->cmd_ctx_pool);

        return 0;
}

static int
efct_hw_mq_process(struct efct_hw *hw,
                   int status, struct sli4_queue *mq)
{
        u8 mqe[SLI4_BMBX_SIZE];
        int rc;

        rc = sli_mq_read(&hw->sli, mq, mqe);
        if (!rc)
                rc = efct_hw_command_process(hw, status, mqe, mq->size);

        return rc;
}

static int
efct_hw_command_cancel(struct efct_hw *hw)
{
        unsigned long flags = 0;
        int rc = 0;

        spin_lock_irqsave(&hw->cmd_lock, flags);

        /*
         * Manually clean up remaining commands. Note: since this calls
         * efct_hw_command_process(), we'll also process the cmd_pending
         * list, so no need to manually clean that out.
         */
        while (!list_empty(&hw->cmd_head)) {
                u8              mqe[SLI4_BMBX_SIZE] = { 0 };
                struct efct_command_ctx *ctx;

                ctx = list_first_entry(&hw->cmd_head,
                                       struct efct_command_ctx, list_entry);

                efc_log_debug(hw->os, "hung command %08x\n",
                              !ctx ? U32_MAX : *((u32 *)ctx->buf));
                spin_unlock_irqrestore(&hw->cmd_lock, flags);
                rc = efct_hw_command_process(hw, -1, mqe, SLI4_BMBX_SIZE);
                spin_lock_irqsave(&hw->cmd_lock, flags);
        }

        spin_unlock_irqrestore(&hw->cmd_lock, flags);

        return rc;
}

static void
efct_mbox_rsp_cb(struct efct_hw *hw, int status, u8 *mqe, void *arg)
{
        struct efct_mbox_rqst_ctx *ctx = arg;

        if (ctx) {
                if (ctx->callback)
                        (*ctx->callback)(hw->os->efcport, status, mqe,
                                         ctx->arg);

                mempool_free(ctx, hw->mbox_rqst_pool);
        }
}

int
efct_issue_mbox_rqst(void *base, void *cmd, void *cb, void *arg)
{
        struct efct_mbox_rqst_ctx *ctx;
        struct efct *efct = base;
        struct efct_hw *hw = &efct->hw;
        int rc;

        /*
         * Allocate a callback context (which includes the mbox cmd buffer),
         * we need this to be persistent as the mbox cmd submission may be
         * queued and executed later execution.
         */
        ctx = mempool_alloc(hw->mbox_rqst_pool, GFP_ATOMIC);
        if (!ctx)
                return -EIO;

        ctx->callback = cb;
        ctx->arg = arg;

        rc = efct_hw_command(hw, cmd, EFCT_CMD_NOWAIT, efct_mbox_rsp_cb, ctx);
        if (rc) {
                efc_log_err(efct, "issue mbox rqst failure rc:%d\n", rc);
                mempool_free(ctx, hw->mbox_rqst_pool);
                return -EIO;
        }

        return 0;
}

static inline struct efct_hw_io *
_efct_hw_io_alloc(struct efct_hw *hw)
{
        struct efct_hw_io *io = NULL;

        if (!list_empty(&hw->io_free)) {
                io = list_first_entry(&hw->io_free, struct efct_hw_io,
                                      list_entry);
                list_del(&io->list_entry);
        }
        if (io) {
                INIT_LIST_HEAD(&io->list_entry);
                list_add_tail(&io->list_entry, &hw->io_inuse);
                io->state = EFCT_HW_IO_STATE_INUSE;
                io->abort_reqtag = U32_MAX;
                io->wq = hw->wq_cpu_array[raw_smp_processor_id()];
                if (!io->wq) {
                        efc_log_err(hw->os, "WQ not assigned for cpu:%d\n",
                                    raw_smp_processor_id());
                        io->wq = hw->hw_wq[0];
                }
                kref_init(&io->ref);
                io->release = efct_hw_io_free_internal;
        } else {
                atomic_add(1, &hw->io_alloc_failed_count);
        }

        return io;
}

struct efct_hw_io *
efct_hw_io_alloc(struct efct_hw *hw)
{
        struct efct_hw_io *io = NULL;
        unsigned long flags = 0;

        spin_lock_irqsave(&hw->io_lock, flags);
        io = _efct_hw_io_alloc(hw);
        spin_unlock_irqrestore(&hw->io_lock, flags);

        return io;
}

static void
efct_hw_io_free_move_correct_list(struct efct_hw *hw,
                                  struct efct_hw_io *io)
{
        /*
         * When an IO is freed, depending on the exchange busy flag,
         * move it to the correct list.
         */
        if (io->xbusy) {
                /*
                 * add to wait_free list and wait for XRI_ABORTED CQEs to clean
                 * up
                 */
                INIT_LIST_HEAD(&io->list_entry);
                list_add_tail(&io->list_entry, &hw->io_wait_free);
                io->state = EFCT_HW_IO_STATE_WAIT_FREE;
        } else {
                /* IO not busy, add to free list */
                INIT_LIST_HEAD(&io->list_entry);
                list_add_tail(&io->list_entry, &hw->io_free);
                io->state = EFCT_HW_IO_STATE_FREE;
        }
}

static inline void
efct_hw_io_free_common(struct efct_hw *hw, struct efct_hw_io *io)
{
        /* initialize IO fields */
        efct_hw_init_free_io(io);

        /* Restore default SGL */
        efct_hw_io_restore_sgl(hw, io);
}

void
efct_hw_io_free_internal(struct kref *arg)
{
        unsigned long flags = 0;
        struct efct_hw_io *io = container_of(arg, struct efct_hw_io, ref);
        struct efct_hw *hw = io->hw;

        /* perform common cleanup */
        efct_hw_io_free_common(hw, io);

        spin_lock_irqsave(&hw->io_lock, flags);
        /* remove from in-use list */
        if (!list_empty(&io->list_entry) && !list_empty(&hw->io_inuse)) {
                list_del_init(&io->list_entry);
                efct_hw_io_free_move_correct_list(hw, io);
        }
        spin_unlock_irqrestore(&hw->io_lock, flags);
}

int
efct_hw_io_free(struct efct_hw *hw, struct efct_hw_io *io)
{
        return kref_put(&io->ref, io->release);
}

struct efct_hw_io *
efct_hw_io_lookup(struct efct_hw *hw, u32 xri)
{
        u32 ioindex;

        ioindex = xri - hw->sli.ext[SLI4_RSRC_XRI].base[0];
        return hw->io[ioindex];
}

int
efct_hw_io_init_sges(struct efct_hw *hw, struct efct_hw_io *io,
                     enum efct_hw_io_type type)
{
        struct sli4_sge *data = NULL;
        u32 i = 0;
        u32 skips = 0;
        u32 sge_flags = 0;

        if (!io) {
                efc_log_err(hw->os, "bad parameter hw=%p io=%p\n", hw, io);
                return -EIO;
        }

        /* Clear / reset the scatter-gather list */
        io->sgl = &io->def_sgl;
        io->sgl_count = io->def_sgl_count;
        io->first_data_sge = 0;

        memset(io->sgl->virt, 0, 2 * sizeof(struct sli4_sge));
        io->n_sge = 0;
        io->sge_offset = 0;

        io->type = type;

        data = io->sgl->virt;

        /*
         * Some IO types have underlying hardware requirements on the order
         * of SGEs. Process all special entries here.
         */
        switch (type) {
        case EFCT_HW_IO_TARGET_WRITE:

                /* populate host resident XFER_RDY buffer */
                sge_flags = le32_to_cpu(data->dw2_flags);
                sge_flags &= (~SLI4_SGE_TYPE_MASK);
                sge_flags |= (SLI4_SGE_TYPE_DATA << SLI4_SGE_TYPE_SHIFT);
                data->buffer_address_high =
                        cpu_to_le32(upper_32_bits(io->xfer_rdy.phys));
                data->buffer_address_low  =
                        cpu_to_le32(lower_32_bits(io->xfer_rdy.phys));
                data->buffer_length = cpu_to_le32(io->xfer_rdy.size);
                data->dw2_flags = cpu_to_le32(sge_flags);
                data++;

                skips = EFCT_TARGET_WRITE_SKIPS;

                io->n_sge = 1;
                break;
        case EFCT_HW_IO_TARGET_READ:
                /*
                 * For FCP_TSEND64, the first 2 entries are SKIP SGE's
                 */
                skips = EFCT_TARGET_READ_SKIPS;
                break;
        case EFCT_HW_IO_TARGET_RSP:
                /*
                 * No skips, etc. for FCP_TRSP64
                 */
                break;
        default:
                efc_log_err(hw->os, "unsupported IO type %#x\n", type);
                return -EIO;
        }

        /*
         * Write skip entries
         */
        for (i = 0; i < skips; i++) {
                sge_flags = le32_to_cpu(data->dw2_flags);
                sge_flags &= (~SLI4_SGE_TYPE_MASK);
                sge_flags |= (SLI4_SGE_TYPE_SKIP << SLI4_SGE_TYPE_SHIFT);
                data->dw2_flags = cpu_to_le32(sge_flags);
                data++;
        }

        io->n_sge += skips;

        /*
         * Set last
         */
        sge_flags = le32_to_cpu(data->dw2_flags);
        sge_flags |= SLI4_SGE_LAST;
        data->dw2_flags = cpu_to_le32(sge_flags);

        return 0;
}

int
efct_hw_io_add_sge(struct efct_hw *hw, struct efct_hw_io *io,
                   uintptr_t addr, u32 length)
{
        struct sli4_sge *data = NULL;
        u32 sge_flags = 0;

        if (!io || !addr || !length) {
                efc_log_err(hw->os,
                            "bad parameter hw=%p io=%p addr=%lx length=%u\n",
                            hw, io, addr, length);
                return -EIO;
        }

        if (length > hw->sli.sge_supported_length) {
                efc_log_err(hw->os,
                            "length of SGE %d bigger than allowed %d\n",
                            length, hw->sli.sge_supported_length);
                return -EIO;
        }

        data = io->sgl->virt;
        data += io->n_sge;

        sge_flags = le32_to_cpu(data->dw2_flags);
        sge_flags &= ~SLI4_SGE_TYPE_MASK;
        sge_flags |= SLI4_SGE_TYPE_DATA << SLI4_SGE_TYPE_SHIFT;
        sge_flags &= ~SLI4_SGE_DATA_OFFSET_MASK;
        sge_flags |= SLI4_SGE_DATA_OFFSET_MASK & io->sge_offset;

        data->buffer_address_high = cpu_to_le32(upper_32_bits(addr));
        data->buffer_address_low  = cpu_to_le32(lower_32_bits(addr));
        data->buffer_length = cpu_to_le32(length);

        /*
         * Always assume this is the last entry and mark as such.
         * If this is not the first entry unset the "last SGE"
         * indication for the previous entry
         */
        sge_flags |= SLI4_SGE_LAST;
        data->dw2_flags = cpu_to_le32(sge_flags);

        if (io->n_sge) {
                sge_flags = le32_to_cpu(data[-1].dw2_flags);
                sge_flags &= ~SLI4_SGE_LAST;
                data[-1].dw2_flags = cpu_to_le32(sge_flags);
        }

        /* Set first_data_bde if not previously set */
        if (io->first_data_sge == 0)
                io->first_data_sge = io->n_sge;

        io->sge_offset += length;
        io->n_sge++;

        return 0;
}

void
efct_hw_io_abort_all(struct efct_hw *hw)
{
        struct efct_hw_io *io_to_abort  = NULL;
        struct efct_hw_io *next_io = NULL;

        list_for_each_entry_safe(io_to_abort, next_io,
                                 &hw->io_inuse, list_entry) {
                efct_hw_io_abort(hw, io_to_abort, true, NULL, NULL);
        }
}

static void
efct_hw_wq_process_abort(void *arg, u8 *cqe, int status)
{
        struct efct_hw_io *io = arg;
        struct efct_hw *hw = io->hw;
        u32 ext = 0;
        u32 len = 0;
        struct hw_wq_callback *wqcb;

        /*
         * For IOs that were aborted internally, we may need to issue the
         * callback here depending on whether a XRI_ABORTED CQE is expected ot
         * not. If the status is Local Reject/No XRI, then
         * issue the callback now.
         */
        ext = sli_fc_ext_status(&hw->sli, cqe);
        if (status == SLI4_FC_WCQE_STATUS_LOCAL_REJECT &&
            ext == SLI4_FC_LOCAL_REJECT_NO_XRI && io->done) {
                efct_hw_done_t done = io->done;

                io->done = NULL;

                /*
                 * Use latched status as this is always saved for an internal
                 * abort Note: We won't have both a done and abort_done
                 * function, so don't worry about
                 *       clobbering the len, status and ext fields.
                 */
                status = io->saved_status;
                len = io->saved_len;
                ext = io->saved_ext;
                io->status_saved = false;
                done(io, len, status, ext, io->arg);
        }

        if (io->abort_done) {
                efct_hw_done_t done = io->abort_done;

                io->abort_done = NULL;
                done(io, len, status, ext, io->abort_arg);
        }

        /* clear abort bit to indicate abort is complete */
        io->abort_in_progress = false;

        /* Free the WQ callback */
        if (io->abort_reqtag == U32_MAX) {
                efc_log_err(hw->os, "HW IO already freed\n");
                return;
        }

        wqcb = efct_hw_reqtag_get_instance(hw, io->abort_reqtag);
        efct_hw_reqtag_free(hw, wqcb);

        /*
         * Call efct_hw_io_free() because this releases the WQ reservation as
         * well as doing the refcount put. Don't duplicate the code here.
         */
        (void)efct_hw_io_free(hw, io);
}

static void
efct_hw_fill_abort_wqe(struct efct_hw *hw, struct efct_hw_wqe *wqe)
{
        struct sli4_abort_wqe *abort = (void *)wqe->wqebuf;

        memset(abort, 0, hw->sli.wqe_size);

        abort->criteria = SLI4_ABORT_CRITERIA_XRI_TAG;
        abort->ia_ir_byte |= wqe->send_abts ? 0 : 1;

        /* Suppress ABTS retries */
        abort->ia_ir_byte |= SLI4_ABRT_WQE_IR;

        abort->t_tag  = cpu_to_le32(wqe->id);
        abort->command = SLI4_WQE_ABORT;
        abort->request_tag = cpu_to_le16(wqe->abort_reqtag);

        abort->dw10w0_flags = cpu_to_le16(SLI4_ABRT_WQE_QOSD);

        abort->cq_id = cpu_to_le16(SLI4_CQ_DEFAULT);
}

int
efct_hw_io_abort(struct efct_hw *hw, struct efct_hw_io *io_to_abort,
                 bool send_abts, void *cb, void *arg)
{
        struct hw_wq_callback *wqcb;
        unsigned long flags = 0;

        if (!io_to_abort) {
                efc_log_err(hw->os, "bad parameter hw=%p io=%p\n",
                            hw, io_to_abort);
                return -EIO;
        }

        if (hw->state != EFCT_HW_STATE_ACTIVE) {
                efc_log_err(hw->os, "cannot send IO abort, HW state=%d\n",
                            hw->state);
                return -EIO;
        }

        /* take a reference on IO being aborted */
        if (kref_get_unless_zero(&io_to_abort->ref) == 0) {
                /* command no longer active */
                efc_log_debug(hw->os,
                              "io not active xri=0x%x tag=0x%x\n",
                              io_to_abort->indicator, io_to_abort->reqtag);
                return -ENOENT;
        }

        /* Must have a valid WQ reference */
        if (!io_to_abort->wq) {
                efc_log_debug(hw->os, "io_to_abort xri=0x%x not active on WQ\n",
                              io_to_abort->indicator);
                /* efct_ref_get(): same function */
                kref_put(&io_to_abort->ref, io_to_abort->release);
                return -ENOENT;
        }

        /*
         * Validation checks complete; now check to see if already being
         * aborted, if not set the flag.
         */
        if (cmpxchg(&io_to_abort->abort_in_progress, false, true)) {
                /* efct_ref_get(): same function */
                kref_put(&io_to_abort->ref, io_to_abort->release);
                efc_log_debug(hw->os,
                              "io already being aborted xri=0x%x tag=0x%x\n",
                              io_to_abort->indicator, io_to_abort->reqtag);
                return -EINPROGRESS;
        }

        /*
         * If we got here, the possibilities are:
         * - host owned xri
         *      - io_to_abort->wq_index != U32_MAX
         *              - submit ABORT_WQE to same WQ
         * - port owned xri:
         *      - rxri: io_to_abort->wq_index == U32_MAX
         *              - submit ABORT_WQE to any WQ
         *      - non-rxri
         *              - io_to_abort->index != U32_MAX
         *                      - submit ABORT_WQE to same WQ
         *              - io_to_abort->index == U32_MAX
         *                      - submit ABORT_WQE to any WQ
         */
        io_to_abort->abort_done = cb;
        io_to_abort->abort_arg  = arg;

        /* Allocate a request tag for the abort portion of this IO */
        wqcb = efct_hw_reqtag_alloc(hw, efct_hw_wq_process_abort, io_to_abort);
        if (!wqcb) {
                efc_log_err(hw->os, "can't allocate request tag\n");

                return -ENOSPC;
        }

        io_to_abort->abort_reqtag = wqcb->instance_index;
        io_to_abort->wqe.send_abts = send_abts;
        io_to_abort->wqe.id = io_to_abort->indicator;
        io_to_abort->wqe.abort_reqtag = io_to_abort->abort_reqtag;

        /*
         * If the wqe is on the pending list, then set this wqe to be
         * aborted when the IO's wqe is removed from the list.
         */
        if (io_to_abort->wq) {
                spin_lock_irqsave(&io_to_abort->wq->queue->lock, flags);
                if (io_to_abort->wqe.list_entry.next) {
                        io_to_abort->wqe.abort_wqe_submit_needed = true;
                        spin_unlock_irqrestore(&io_to_abort->wq->queue->lock,
                                               flags);
                        return 0;
                }
                spin_unlock_irqrestore(&io_to_abort->wq->queue->lock, flags);
        }

        efct_hw_fill_abort_wqe(hw, &io_to_abort->wqe);

        /* ABORT_WQE does not actually utilize an XRI on the Port,
         * therefore, keep xbusy as-is to track the exchange's state,
         * not the ABORT_WQE's state
         */
        if (efct_hw_wq_write(io_to_abort->wq, &io_to_abort->wqe)) {
                io_to_abort->abort_in_progress = false;
                /* efct_ref_get(): same function */
                kref_put(&io_to_abort->ref, io_to_abort->release);
                return -EIO;
        }

        return 0;
}

void
efct_hw_reqtag_pool_free(struct efct_hw *hw)
{
        u32 i;
        struct reqtag_pool *reqtag_pool = hw->wq_reqtag_pool;
        struct hw_wq_callback *wqcb = NULL;

        if (reqtag_pool) {
                for (i = 0; i < U16_MAX; i++) {
                        wqcb = reqtag_pool->tags[i];
                        if (!wqcb)
                                continue;

                        kfree(wqcb);
                }
                kfree(reqtag_pool);
                hw->wq_reqtag_pool = NULL;
        }
}

struct reqtag_pool *
efct_hw_reqtag_pool_alloc(struct efct_hw *hw)
{
        u32 i = 0;
        struct reqtag_pool *reqtag_pool;
        struct hw_wq_callback *wqcb;

        reqtag_pool = kzalloc(sizeof(*reqtag_pool), GFP_KERNEL);
        if (!reqtag_pool)
                return NULL;

        INIT_LIST_HEAD(&reqtag_pool->freelist);
        /* initialize reqtag pool lock */
        spin_lock_init(&reqtag_pool->lock);
        for (i = 0; i < U16_MAX; i++) {
                wqcb = kmalloc(sizeof(*wqcb), GFP_KERNEL);
                if (!wqcb)
                        break;

                reqtag_pool->tags[i] = wqcb;
                wqcb->instance_index = i;
                wqcb->callback = NULL;
                wqcb->arg = NULL;
                INIT_LIST_HEAD(&wqcb->list_entry);
                list_add_tail(&wqcb->list_entry, &reqtag_pool->freelist);
        }

        return reqtag_pool;
}

struct hw_wq_callback *
efct_hw_reqtag_alloc(struct efct_hw *hw,
                     void (*callback)(void *arg, u8 *cqe, int status),
                     void *arg)
{
        struct hw_wq_callback *wqcb = NULL;
        struct reqtag_pool *reqtag_pool = hw->wq_reqtag_pool;
        unsigned long flags = 0;

        if (!callback)
                return wqcb;

        spin_lock_irqsave(&reqtag_pool->lock, flags);

        if (!list_empty(&reqtag_pool->freelist)) {
                wqcb = list_first_entry(&reqtag_pool->freelist,
                                        struct hw_wq_callback, list_entry);
        }

        if (wqcb) {
                list_del_init(&wqcb->list_entry);
                spin_unlock_irqrestore(&reqtag_pool->lock, flags);
                wqcb->callback = callback;
                wqcb->arg = arg;
        } else {
                spin_unlock_irqrestore(&reqtag_pool->lock, flags);
        }

        return wqcb;
}

void
efct_hw_reqtag_free(struct efct_hw *hw, struct hw_wq_callback *wqcb)
{
        unsigned long flags = 0;
        struct reqtag_pool *reqtag_pool = hw->wq_reqtag_pool;

        if (!wqcb->callback)
                efc_log_err(hw->os, "WQCB is already freed\n");

        spin_lock_irqsave(&reqtag_pool->lock, flags);
        wqcb->callback = NULL;
        wqcb->arg = NULL;
        INIT_LIST_HEAD(&wqcb->list_entry);
        list_add(&wqcb->list_entry, &hw->wq_reqtag_pool->freelist);
        spin_unlock_irqrestore(&reqtag_pool->lock, flags);
}

struct hw_wq_callback *
efct_hw_reqtag_get_instance(struct efct_hw *hw, u32 instance_index)
{
        struct hw_wq_callback *wqcb;

        wqcb = hw->wq_reqtag_pool->tags[instance_index];
        if (!wqcb)
                efc_log_err(hw->os, "wqcb for instance %d is null\n",
                            instance_index);

        return wqcb;
}

int
efct_hw_queue_hash_find(struct efct_queue_hash *hash, u16 id)
{
        int index = -1;
        int i = id & (EFCT_HW_Q_HASH_SIZE - 1);

        /*
         * Since the hash is always bigger than the maximum number of Qs, then
         * we never have to worry about an infinite loop. We will always find
         * an unused entry.
         */
        do {
                if (hash[i].in_use && hash[i].id == id)
                        index = hash[i].index;
                else
                        i = (i + 1) & (EFCT_HW_Q_HASH_SIZE - 1);
        } while (index == -1 && hash[i].in_use);

        return index;
}

int
efct_hw_process(struct efct_hw *hw, u32 vector,
                u32 max_isr_time_msec)
{
        struct hw_eq *eq;

        /*
         * The caller should disable interrupts if they wish to prevent us
         * from processing during a shutdown. The following states are defined:
         *   EFCT_HW_STATE_UNINITIALIZED - No queues allocated
         *   EFCT_HW_STATE_QUEUES_ALLOCATED - The state after a chip reset,
         *                                    queues are cleared.
         *   EFCT_HW_STATE_ACTIVE - Chip and queues are operational
         *   EFCT_HW_STATE_RESET_IN_PROGRESS - reset, we still want completions
         *   EFCT_HW_STATE_TEARDOWN_IN_PROGRESS - We still want mailbox
         *                                        completions.
         */
        if (hw->state == EFCT_HW_STATE_UNINITIALIZED)
                return 0;

        /* Get pointer to struct hw_eq */
        eq = hw->hw_eq[vector];
        if (!eq)
                return 0;

        eq->use_count++;

        return efct_hw_eq_process(hw, eq, max_isr_time_msec);
}

int
efct_hw_eq_process(struct efct_hw *hw, struct hw_eq *eq,
                   u32 max_isr_time_msec)
{
        u8 eqe[sizeof(struct sli4_eqe)] = { 0 };
        u32 tcheck_count;
        u64 tstart;
        u64 telapsed;
        bool done = false;

        tcheck_count = EFCT_HW_TIMECHECK_ITERATIONS;
        tstart = jiffies_to_msecs(jiffies);

        while (!done && !sli_eq_read(&hw->sli, eq->queue, eqe)) {
                u16 cq_id = 0;
                int rc;

                rc = sli_eq_parse(&hw->sli, eqe, &cq_id);
                if (unlikely(rc)) {
                        if (rc == SLI4_EQE_STATUS_EQ_FULL) {
                                u32 i;

                                /*
                                 * Received a sentinel EQE indicating the
                                 * EQ is full. Process all CQs
                                 */
                                for (i = 0; i < hw->cq_count; i++)
                                        efct_hw_cq_process(hw, hw->hw_cq[i]);
                                continue;
                        } else {
                                return rc;
                        }
                } else {
                        int index;

                        index  = efct_hw_queue_hash_find(hw->cq_hash, cq_id);

                        if (likely(index >= 0))
                                efct_hw_cq_process(hw, hw->hw_cq[index]);
                        else
                                efc_log_err(hw->os, "bad CQ_ID %#06x\n", cq_id);
                }

                if (eq->queue->n_posted > eq->queue->posted_limit)
                        sli_queue_arm(&hw->sli, eq->queue, false);

                if (tcheck_count && (--tcheck_count == 0)) {
                        tcheck_count = EFCT_HW_TIMECHECK_ITERATIONS;
                        telapsed = jiffies_to_msecs(jiffies) - tstart;
                        if (telapsed >= max_isr_time_msec)
                                done = true;
                }
        }
        sli_queue_eq_arm(&hw->sli, eq->queue, true);

        return 0;
}

static int
_efct_hw_wq_write(struct hw_wq *wq, struct efct_hw_wqe *wqe)
{
        int queue_rc;

        /* Every so often, set the wqec bit to generate comsummed completions */
        if (wq->wqec_count)
                wq->wqec_count--;

        if (wq->wqec_count == 0) {
                struct sli4_generic_wqe *genwqe = (void *)wqe->wqebuf;

                genwqe->cmdtype_wqec_byte |= SLI4_GEN_WQE_WQEC;
                wq->wqec_count = wq->wqec_set_count;
        }

        /* Decrement WQ free count */
        wq->free_count--;

        queue_rc = sli_wq_write(&wq->hw->sli, wq->queue, wqe->wqebuf);

        return (queue_rc < 0) ? -EIO : 0;
}

static void
hw_wq_submit_pending(struct hw_wq *wq, u32 update_free_count)
{
        struct efct_hw_wqe *wqe;
        unsigned long flags = 0;

        spin_lock_irqsave(&wq->queue->lock, flags);

        /* Update free count with value passed in */
        wq->free_count += update_free_count;

        while ((wq->free_count > 0) && (!list_empty(&wq->pending_list))) {
                wqe = list_first_entry(&wq->pending_list,
                                       struct efct_hw_wqe, list_entry);
                list_del_init(&wqe->list_entry);
                _efct_hw_wq_write(wq, wqe);

                if (wqe->abort_wqe_submit_needed) {
                        wqe->abort_wqe_submit_needed = false;
                        efct_hw_fill_abort_wqe(wq->hw, wqe);
                        INIT_LIST_HEAD(&wqe->list_entry);
                        list_add_tail(&wqe->list_entry, &wq->pending_list);
                        wq->wq_pending_count++;
                }
        }

        spin_unlock_irqrestore(&wq->queue->lock, flags);
}

void
efct_hw_cq_process(struct efct_hw *hw, struct hw_cq *cq)
{
        u8 cqe[sizeof(struct sli4_mcqe)];
        u16 rid = U16_MAX;
        /* completion type */
        enum sli4_qentry ctype;
        u32 n_processed = 0;
        u32 tstart, telapsed;

        tstart = jiffies_to_msecs(jiffies);

        while (!sli_cq_read(&hw->sli, cq->queue, cqe)) {
                int status;

                status = sli_cq_parse(&hw->sli, cq->queue, cqe, &ctype, &rid);
                /*
                 * The sign of status is significant. If status is:
                 * == 0 : call completed correctly and
                 * the CQE indicated success
                 * > 0 : call completed correctly and
                 * the CQE indicated an error
                 * < 0 : call failed and no information is available about the
                 * CQE
                 */
                if (status < 0) {
                        if (status == SLI4_MCQE_STATUS_NOT_COMPLETED)
                                /*
                                 * Notification that an entry was consumed,
                                 * but not completed
                                 */
                                continue;

                        break;
                }

                switch (ctype) {
                case SLI4_QENTRY_ASYNC:
                        sli_cqe_async(&hw->sli, cqe);
                        break;
                case SLI4_QENTRY_MQ:
                        /*
                         * Process MQ entry. Note there is no way to determine
                         * the MQ_ID from the completion entry.
                         */
                        efct_hw_mq_process(hw, status, hw->mq);
                        break;
                case SLI4_QENTRY_WQ:
                        efct_hw_wq_process(hw, cq, cqe, status, rid);
                        break;
                case SLI4_QENTRY_WQ_RELEASE: {
                        u32 wq_id = rid;
                        int index;
                        struct hw_wq *wq = NULL;

                        index = efct_hw_queue_hash_find(hw->wq_hash, wq_id);

                        if (likely(index >= 0)) {
                                wq = hw->hw_wq[index];
                        } else {
                                efc_log_err(hw->os, "bad WQ_ID %#06x\n", wq_id);
                                break;
                        }
                        /* Submit any HW IOs that are on the WQ pending list */
                        hw_wq_submit_pending(wq, wq->wqec_set_count);

                        break;
                }

                case SLI4_QENTRY_RQ:
                        efct_hw_rqpair_process_rq(hw, cq, cqe);
                        break;
                case SLI4_QENTRY_XABT: {
                        efct_hw_xabt_process(hw, cq, cqe, rid);
                        break;
                }
                default:
                        efc_log_debug(hw->os, "unhandled ctype=%#x rid=%#x\n",
                                      ctype, rid);
                        break;
                }

                n_processed++;
                if (n_processed == cq->queue->proc_limit)
                        break;

                if (cq->queue->n_posted >= cq->queue->posted_limit)
                        sli_queue_arm(&hw->sli, cq->queue, false);
        }

        sli_queue_arm(&hw->sli, cq->queue, true);

        if (n_processed > cq->queue->max_num_processed)
                cq->queue->max_num_processed = n_processed;
        telapsed = jiffies_to_msecs(jiffies) - tstart;
        if (telapsed > cq->queue->max_process_time)
                cq->queue->max_process_time = telapsed;
}

void
efct_hw_wq_process(struct efct_hw *hw, struct hw_cq *cq,
                   u8 *cqe, int status, u16 rid)
{
        struct hw_wq_callback *wqcb;

        if (rid == EFCT_HW_REQUE_XRI_REGTAG) {
                if (status)
                        efc_log_err(hw->os, "reque xri failed, status = %d\n",
                                    status);
                return;
        }

        wqcb = efct_hw_reqtag_get_instance(hw, rid);
        if (!wqcb) {
                efc_log_err(hw->os, "invalid request tag: x%x\n", rid);
                return;
        }

        if (!wqcb->callback) {
                efc_log_err(hw->os, "wqcb callback is NULL\n");
                return;
        }

        (*wqcb->callback)(wqcb->arg, cqe, status);
}

void
efct_hw_xabt_process(struct efct_hw *hw, struct hw_cq *cq,
                     u8 *cqe, u16 rid)
{
        /* search IOs wait free list */
        struct efct_hw_io *io = NULL;
        unsigned long flags = 0;

        io = efct_hw_io_lookup(hw, rid);
        if (!io) {
                /* IO lookup failure should never happen */
                efc_log_err(hw->os, "xabt io lookup failed rid=%#x\n", rid);
                return;
        }

        if (!io->xbusy)
                efc_log_debug(hw->os, "xabt io not busy rid=%#x\n", rid);
        else
                /* mark IO as no longer busy */
                io->xbusy = false;

        /*
         * For IOs that were aborted internally, we need to issue any pending
         * callback here.
         */
        if (io->done) {
                efct_hw_done_t done = io->done;
                void            *arg = io->arg;

                /*
                 * Use latched status as this is always saved for an internal
                 * abort
                 */
                int status = io->saved_status;
                u32 len = io->saved_len;
                u32 ext = io->saved_ext;

                io->done = NULL;
                io->status_saved = false;

                done(io, len, status, ext, arg);
        }

        spin_lock_irqsave(&hw->io_lock, flags);
        if (io->state == EFCT_HW_IO_STATE_INUSE ||
            io->state == EFCT_HW_IO_STATE_WAIT_FREE) {
                /* if on wait_free list, caller has already freed IO;
                 * remove from wait_free list and add to free list.
                 * if on in-use list, already marked as no longer busy;
                 * just leave there and wait for caller to free.
                 */
                if (io->state == EFCT_HW_IO_STATE_WAIT_FREE) {
                        io->state = EFCT_HW_IO_STATE_FREE;
                        list_del_init(&io->list_entry);
                        efct_hw_io_free_move_correct_list(hw, io);
                }
        }
        spin_unlock_irqrestore(&hw->io_lock, flags);
}

static int
efct_hw_flush(struct efct_hw *hw)
{
        u32 i = 0;

        /* Process any remaining completions */
        for (i = 0; i < hw->eq_count; i++)
                efct_hw_process(hw, i, ~0);

        return 0;
}

int
efct_hw_wq_write(struct hw_wq *wq, struct efct_hw_wqe *wqe)
{
        int rc = 0;
        unsigned long flags = 0;

        spin_lock_irqsave(&wq->queue->lock, flags);
        if (list_empty(&wq->pending_list)) {
                if (wq->free_count > 0) {
                        rc = _efct_hw_wq_write(wq, wqe);
                } else {
                        INIT_LIST_HEAD(&wqe->list_entry);
                        list_add_tail(&wqe->list_entry, &wq->pending_list);
                        wq->wq_pending_count++;
                }

                spin_unlock_irqrestore(&wq->queue->lock, flags);
                return rc;
        }

        INIT_LIST_HEAD(&wqe->list_entry);
        list_add_tail(&wqe->list_entry, &wq->pending_list);
        wq->wq_pending_count++;
        while (wq->free_count > 0) {
                wqe = list_first_entry(&wq->pending_list, struct efct_hw_wqe,
                                       list_entry);
                if (!wqe)
                        break;

                list_del_init(&wqe->list_entry);
                rc = _efct_hw_wq_write(wq, wqe);
                if (rc)
                        break;

                if (wqe->abort_wqe_submit_needed) {
                        wqe->abort_wqe_submit_needed = false;
                        efct_hw_fill_abort_wqe(wq->hw, wqe);

                        INIT_LIST_HEAD(&wqe->list_entry);
                        list_add_tail(&wqe->list_entry, &wq->pending_list);
                        wq->wq_pending_count++;
                }
        }

        spin_unlock_irqrestore(&wq->queue->lock, flags);

        return rc;
}

int
efct_efc_bls_send(struct efc *efc, u32 type, struct sli_bls_params *bls)
{
        struct efct *efct = efc->base;

        return efct_hw_bls_send(efct, type, bls, NULL, NULL);
}

int
efct_hw_bls_send(struct efct *efct, u32 type, struct sli_bls_params *bls_params,
                 void *cb, void *arg)
{
        struct efct_hw *hw = &efct->hw;
        struct efct_hw_io *hio;
        struct sli_bls_payload bls;
        int rc;

        if (hw->state != EFCT_HW_STATE_ACTIVE) {
                efc_log_err(hw->os,
                            "cannot send BLS, HW state=%d\n", hw->state);
                return -EIO;
        }

        hio = efct_hw_io_alloc(hw);
        if (!hio) {
                efc_log_err(hw->os, "HIO allocation failed\n");
                return -EIO;
        }

        hio->done = cb;
        hio->arg  = arg;

        bls_params->xri = hio->indicator;
        bls_params->tag = hio->reqtag;

        if (type == FC_RCTL_BA_ACC) {
                hio->type = EFCT_HW_BLS_ACC;
                bls.type = SLI4_SLI_BLS_ACC;
                memcpy(&bls.u.acc, bls_params->payload, sizeof(bls.u.acc));
        } else {
                hio->type = EFCT_HW_BLS_RJT;
                bls.type = SLI4_SLI_BLS_RJT;
                memcpy(&bls.u.rjt, bls_params->payload, sizeof(bls.u.rjt));
        }

        bls.ox_id = cpu_to_le16(bls_params->ox_id);
        bls.rx_id = cpu_to_le16(bls_params->rx_id);

        if (sli_xmit_bls_rsp64_wqe(&hw->sli, hio->wqe.wqebuf,
                                   &bls, bls_params)) {
                efc_log_err(hw->os, "XMIT_BLS_RSP64 WQE error\n");
                return -EIO;
        }

        hio->xbusy = true;

        /*
         * Add IO to active io wqe list before submitting, in case the
         * wcqe processing preempts this thread.
         */
        hio->wq->use_count++;
        rc = efct_hw_wq_write(hio->wq, &hio->wqe);
        if (rc >= 0) {
                /* non-negative return is success */
                rc = 0;
        } else {
                /* failed to write wqe, remove from active wqe list */
                efc_log_err(hw->os,
                            "sli_queue_write failed: %d\n", rc);
                hio->xbusy = false;
        }

        return rc;
}

static int
efct_els_ssrs_send_cb(struct efct_hw_io *hio, u32 length, int status,
                      u32 ext_status, void *arg)
{
        struct efc_disc_io *io = arg;

        efc_disc_io_complete(io, length, status, ext_status);
        return 0;
}

static inline void
efct_fill_els_params(struct efc_disc_io *io, struct sli_els_params *params)
{
        u8 *cmd = io->req.virt;

        params->cmd = *cmd;
        params->s_id = io->s_id;
        params->d_id = io->d_id;
        params->ox_id = io->iparam.els.ox_id;
        params->rpi = io->rpi;
        params->vpi = io->vpi;
        params->rpi_registered = io->rpi_registered;
        params->xmit_len = io->xmit_len;
        params->rsp_len = io->rsp_len;
        params->timeout = io->iparam.els.timeout;
}

static inline void
efct_fill_ct_params(struct efc_disc_io *io, struct sli_ct_params *params)
{
        params->r_ctl = io->iparam.ct.r_ctl;
        params->type = io->iparam.ct.type;
        params->df_ctl =  io->iparam.ct.df_ctl;
        params->d_id = io->d_id;
        params->ox_id = io->iparam.ct.ox_id;
        params->rpi = io->rpi;
        params->vpi = io->vpi;
        params->rpi_registered = io->rpi_registered;
        params->xmit_len = io->xmit_len;
        params->rsp_len = io->rsp_len;
        params->timeout = io->iparam.ct.timeout;
}

/**
 * efct_els_hw_srrs_send() - Send a single request and response cmd.
 * @efc: efc library structure
 * @io: Discovery IO used to hold els and ct cmd context.
 *
 * This routine supports communication sequences consisting of a single
 * request and single response between two endpoints. Examples include:
 *  - Sending an ELS request.
 *  - Sending an ELS response - To send an ELS response, the caller must provide
 * the OX_ID from the received request.
 *  - Sending a FC Common Transport (FC-CT) request - To send a FC-CT request,
 * the caller must provide the R_CTL, TYPE, and DF_CTL
 * values to place in the FC frame header.
 *
 * Return: Status of the request.
 */
int
efct_els_hw_srrs_send(struct efc *efc, struct efc_disc_io *io)
{
        struct efct *efct = efc->base;
        struct efct_hw_io *hio;
        struct efct_hw *hw = &efct->hw;
        struct efc_dma *send = &io->req;
        struct efc_dma *receive = &io->rsp;
        struct sli4_sge *sge = NULL;
        int rc = 0;
        u32 len = io->xmit_len;
        u32 sge0_flags;
        u32 sge1_flags;

        hio = efct_hw_io_alloc(hw);
        if (!hio) {
                pr_err("HIO alloc failed\n");
                return -EIO;
        }

        if (hw->state != EFCT_HW_STATE_ACTIVE) {
                efc_log_debug(hw->os,
                              "cannot send SRRS, HW state=%d\n", hw->state);
                return -EIO;
        }

        hio->done = efct_els_ssrs_send_cb;
        hio->arg  = io;

        sge = hio->sgl->virt;

        /* clear both SGE */
        memset(hio->sgl->virt, 0, 2 * sizeof(struct sli4_sge));

        sge0_flags = le32_to_cpu(sge[0].dw2_flags);
        sge1_flags = le32_to_cpu(sge[1].dw2_flags);
        if (send->size) {
                sge[0].buffer_address_high =
                        cpu_to_le32(upper_32_bits(send->phys));
                sge[0].buffer_address_low  =
                        cpu_to_le32(lower_32_bits(send->phys));

                sge0_flags |= (SLI4_SGE_TYPE_DATA << SLI4_SGE_TYPE_SHIFT);

                sge[0].buffer_length = cpu_to_le32(len);
        }

        if (io->io_type == EFC_DISC_IO_ELS_REQ ||
            io->io_type == EFC_DISC_IO_CT_REQ) {
                sge[1].buffer_address_high =
                        cpu_to_le32(upper_32_bits(receive->phys));
                sge[1].buffer_address_low  =
                        cpu_to_le32(lower_32_bits(receive->phys));

                sge1_flags |= (SLI4_SGE_TYPE_DATA << SLI4_SGE_TYPE_SHIFT);
                sge1_flags |= SLI4_SGE_LAST;

                sge[1].buffer_length = cpu_to_le32(receive->size);
        } else {
                sge0_flags |= SLI4_SGE_LAST;
        }

        sge[0].dw2_flags = cpu_to_le32(sge0_flags);
        sge[1].dw2_flags = cpu_to_le32(sge1_flags);

        switch (io->io_type) {
        case EFC_DISC_IO_ELS_REQ: {
                struct sli_els_params els_params;

                hio->type = EFCT_HW_ELS_REQ;
                efct_fill_els_params(io, &els_params);
                els_params.xri = hio->indicator;
                els_params.tag = hio->reqtag;

                if (sli_els_request64_wqe(&hw->sli, hio->wqe.wqebuf, hio->sgl,
                                          &els_params)) {
                        efc_log_err(hw->os, "REQ WQE error\n");
                        rc = -EIO;
                }
                break;
        }
        case EFC_DISC_IO_ELS_RESP: {
                struct sli_els_params els_params;

                hio->type = EFCT_HW_ELS_RSP;
                efct_fill_els_params(io, &els_params);
                els_params.xri = hio->indicator;
                els_params.tag = hio->reqtag;
                if (sli_xmit_els_rsp64_wqe(&hw->sli, hio->wqe.wqebuf, send,
                                           &els_params)){
                        efc_log_err(hw->os, "RSP WQE error\n");
                        rc = -EIO;
                }
                break;
        }
        case EFC_DISC_IO_CT_REQ: {
                struct sli_ct_params ct_params;

                hio->type = EFCT_HW_FC_CT;
                efct_fill_ct_params(io, &ct_params);
                ct_params.xri = hio->indicator;
                ct_params.tag = hio->reqtag;
                if (sli_gen_request64_wqe(&hw->sli, hio->wqe.wqebuf, hio->sgl,
                                          &ct_params)){
                        efc_log_err(hw->os, "GEN WQE error\n");
                        rc = -EIO;
                }
                break;
        }
        case EFC_DISC_IO_CT_RESP: {
                struct sli_ct_params ct_params;

                hio->type = EFCT_HW_FC_CT_RSP;
                efct_fill_ct_params(io, &ct_params);
                ct_params.xri = hio->indicator;
                ct_params.tag = hio->reqtag;
                if (sli_xmit_sequence64_wqe(&hw->sli, hio->wqe.wqebuf, hio->sgl,
                                            &ct_params)){
                        efc_log_err(hw->os, "XMIT SEQ WQE error\n");
                        rc = -EIO;
                }
                break;
        }
        default:
                efc_log_err(hw->os, "bad SRRS type %#x\n", io->io_type);
                rc = -EIO;
        }

        if (rc == 0) {
                hio->xbusy = true;

                /*
                 * Add IO to active io wqe list before submitting, in case the
                 * wcqe processing preempts this thread.
                 */
                hio->wq->use_count++;
                rc = efct_hw_wq_write(hio->wq, &hio->wqe);
                if (rc >= 0) {
                        /* non-negative return is success */
                        rc = 0;
                } else {
                        /* failed to write wqe, remove from active wqe list */
                        efc_log_err(hw->os,
                                    "sli_queue_write failed: %d\n", rc);
                        hio->xbusy = false;
                }
        }

        return rc;
}

int
efct_hw_io_send(struct efct_hw *hw, enum efct_hw_io_type type,
                struct efct_hw_io *io, union efct_hw_io_param_u *iparam,
                void *cb, void *arg)
{
        int rc = 0;
        bool send_wqe = true;

        if (!io) {
                pr_err("bad parm hw=%p io=%p\n", hw, io);
                return -EIO;
        }

        if (hw->state != EFCT_HW_STATE_ACTIVE) {
                efc_log_err(hw->os, "cannot send IO, HW state=%d\n", hw->state);
                return -EIO;
        }

        /*
         * Save state needed during later stages
         */
        io->type  = type;
        io->done  = cb;
        io->arg   = arg;

        /*
         * Format the work queue entry used to send the IO
         */
        switch (type) {
        case EFCT_HW_IO_TARGET_WRITE: {
                u16 *flags = &iparam->fcp_tgt.flags;
                struct fcp_txrdy *xfer = io->xfer_rdy.virt;

                /*
                 * Fill in the XFER_RDY for IF_TYPE 0 devices
                 */
                xfer->ft_data_ro = cpu_to_be32(iparam->fcp_tgt.offset);
                xfer->ft_burst_len = cpu_to_be32(iparam->fcp_tgt.xmit_len);

                if (io->xbusy)
                        *flags |= SLI4_IO_CONTINUATION;
                else
                        *flags &= ~SLI4_IO_CONTINUATION;
                iparam->fcp_tgt.xri = io->indicator;
                iparam->fcp_tgt.tag = io->reqtag;

                if (sli_fcp_treceive64_wqe(&hw->sli, io->wqe.wqebuf,
                                           &io->def_sgl, io->first_data_sge,
                                           SLI4_CQ_DEFAULT,
                                           0, 0, &iparam->fcp_tgt)) {
                        efc_log_err(hw->os, "TRECEIVE WQE error\n");
                        rc = -EIO;
                }
                break;
        }
        case EFCT_HW_IO_TARGET_READ: {
                u16 *flags = &iparam->fcp_tgt.flags;

                if (io->xbusy)
                        *flags |= SLI4_IO_CONTINUATION;
                else
                        *flags &= ~SLI4_IO_CONTINUATION;

                iparam->fcp_tgt.xri = io->indicator;
                iparam->fcp_tgt.tag = io->reqtag;

                if (sli_fcp_tsend64_wqe(&hw->sli, io->wqe.wqebuf,
                                        &io->def_sgl, io->first_data_sge,
                                        SLI4_CQ_DEFAULT,
                                        0, 0, &iparam->fcp_tgt)) {
                        efc_log_err(hw->os, "TSEND WQE error\n");
                        rc = -EIO;
                }
                break;
        }
        case EFCT_HW_IO_TARGET_RSP: {
                u16 *flags = &iparam->fcp_tgt.flags;

                if (io->xbusy)
                        *flags |= SLI4_IO_CONTINUATION;
                else
                        *flags &= ~SLI4_IO_CONTINUATION;

                iparam->fcp_tgt.xri = io->indicator;
                iparam->fcp_tgt.tag = io->reqtag;

                if (sli_fcp_trsp64_wqe(&hw->sli, io->wqe.wqebuf,
                                       &io->def_sgl, SLI4_CQ_DEFAULT,
                                       0, &iparam->fcp_tgt)) {
                        efc_log_err(hw->os, "TRSP WQE error\n");
                        rc = -EIO;
                }

                break;
        }
        default:
                efc_log_err(hw->os, "unsupported IO type %#x\n", type);
                rc = -EIO;
        }

        if (send_wqe && rc == 0) {
                io->xbusy = true;

                /*
                 * Add IO to active io wqe list before submitting, in case the
                 * wcqe processing preempts this thread.
                 */
                hw->tcmd_wq_submit[io->wq->instance]++;
                io->wq->use_count++;
                rc = efct_hw_wq_write(io->wq, &io->wqe);
                if (rc >= 0) {
                        /* non-negative return is success */
                        rc = 0;
                } else {
                        /* failed to write wqe, remove from active wqe list */
                        efc_log_err(hw->os,
                                    "sli_queue_write failed: %d\n", rc);
                        io->xbusy = false;
                }
        }

        return rc;
}

int
efct_hw_send_frame(struct efct_hw *hw, struct fc_frame_header *hdr,
                   u8 sof, u8 eof, struct efc_dma *payload,
                   struct efct_hw_send_frame_context *ctx,
                   void (*callback)(void *arg, u8 *cqe, int status),
                   void *arg)
{
        int rc;
        struct efct_hw_wqe *wqe;
        u32 xri;
        struct hw_wq *wq;

        wqe = &ctx->wqe;

        /* populate the callback object */
        ctx->hw = hw;

        /* Fetch and populate request tag */
        ctx->wqcb = efct_hw_reqtag_alloc(hw, callback, arg);
        if (!ctx->wqcb) {
                efc_log_err(hw->os, "can't allocate request tag\n");
                return -ENOSPC;
        }

        wq = hw->hw_wq[0];

        /* Set XRI and RX_ID in the header based on which WQ, and which
         * send_frame_io we are using
         */
        xri = wq->send_frame_io->indicator;

        /* Build the send frame WQE */