bfa_msgq.c

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/*
 * Linux network driver for Brocade Converged Network Adapter.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License (GPL) Version 2 as
 * published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
/*
 * Copyright (c) 2005-2011 Brocade Communications Systems, Inc.
 * All rights reserved
 * www.brocade.com
 */

/* MSGQ module source file. */

#include "bfi.h"
#include "bfa_msgq.h"
#include "bfa_ioc.h"

#define call_cmdq_ent_cbfn(_cmdq_ent, _status)              \
{                                   \
    bfa_msgq_cmdcbfn_t cbfn;                    \
    void *cbarg;                            \
    cbfn = (_cmdq_ent)->cbfn;                   \
    cbarg = (_cmdq_ent)->cbarg;                 \
    (_cmdq_ent)->cbfn = NULL;                   \
    (_cmdq_ent)->cbarg = NULL;                  \
    if (cbfn) {                         \
        cbfn(cbarg, (_status));                 \
    }                               \
}

static void bfa_msgq_cmdq_dbell(struct bfa_msgq_cmdq *cmdq);
static void bfa_msgq_cmdq_copy_rsp(struct bfa_msgq_cmdq *cmdq);

enum cmdq_event {
    CMDQ_E_START            = 1,
    CMDQ_E_STOP         = 2,
    CMDQ_E_FAIL         = 3,
    CMDQ_E_POST         = 4,
    CMDQ_E_INIT_RESP        = 5,
    CMDQ_E_DB_READY         = 6,
};

bfa_fsm_state_decl(cmdq, stopped, struct bfa_msgq_cmdq, enum cmdq_event);
bfa_fsm_state_decl(cmdq, init_wait, struct bfa_msgq_cmdq, enum cmdq_event);
bfa_fsm_state_decl(cmdq, ready, struct bfa_msgq_cmdq, enum cmdq_event);
bfa_fsm_state_decl(cmdq, dbell_wait, struct bfa_msgq_cmdq,
            enum cmdq_event);

static void
cmdq_sm_stopped_entry(struct bfa_msgq_cmdq *cmdq)
{
    struct bfa_msgq_cmd_entry *cmdq_ent;

    cmdq->producer_index = 0;
    cmdq->consumer_index = 0;
    cmdq->flags = 0;
    cmdq->token = 0;
    cmdq->offset = 0;
    cmdq->bytes_to_copy = 0;
    while (!list_empty(&cmdq->pending_q)) {
        bfa_q_deq(&cmdq->pending_q, &cmdq_ent);
        bfa_q_qe_init(&cmdq_ent->qe);
        call_cmdq_ent_cbfn(cmdq_ent, BFA_STATUS_FAILED);
    }
}

static void
cmdq_sm_stopped(struct bfa_msgq_cmdq *cmdq, enum cmdq_event event)
{
    switch (event) {
    case CMDQ_E_START:
        bfa_fsm_set_state(cmdq, cmdq_sm_init_wait);
        break;

    case CMDQ_E_STOP:
    case CMDQ_E_FAIL:
        /* No-op */
        break;

    case CMDQ_E_POST:
        cmdq->flags |= BFA_MSGQ_CMDQ_F_DB_UPDATE;
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
cmdq_sm_init_wait_entry(struct bfa_msgq_cmdq *cmdq)
{
    bfa_wc_down(&cmdq->msgq->init_wc);
}

static void
cmdq_sm_init_wait(struct bfa_msgq_cmdq *cmdq, enum cmdq_event event)
{
    switch (event) {
    case CMDQ_E_STOP:
    case CMDQ_E_FAIL:
        bfa_fsm_set_state(cmdq, cmdq_sm_stopped);
        break;

    case CMDQ_E_POST:
        cmdq->flags |= BFA_MSGQ_CMDQ_F_DB_UPDATE;
        break;

    case CMDQ_E_INIT_RESP:
        if (cmdq->flags & BFA_MSGQ_CMDQ_F_DB_UPDATE) {
            cmdq->flags &= ~BFA_MSGQ_CMDQ_F_DB_UPDATE;
            bfa_fsm_set_state(cmdq, cmdq_sm_dbell_wait);
        } else
            bfa_fsm_set_state(cmdq, cmdq_sm_ready);
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
cmdq_sm_ready_entry(struct bfa_msgq_cmdq *cmdq)
{
}

static void
cmdq_sm_ready(struct bfa_msgq_cmdq *cmdq, enum cmdq_event event)
{
    switch (event) {
    case CMDQ_E_STOP:
    case CMDQ_E_FAIL:
        bfa_fsm_set_state(cmdq, cmdq_sm_stopped);
        break;

    case CMDQ_E_POST:
        bfa_fsm_set_state(cmdq, cmdq_sm_dbell_wait);
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
cmdq_sm_dbell_wait_entry(struct bfa_msgq_cmdq *cmdq)
{
    bfa_msgq_cmdq_dbell(cmdq);
}

static void
cmdq_sm_dbell_wait(struct bfa_msgq_cmdq *cmdq, enum cmdq_event event)
{
    switch (event) {
    case CMDQ_E_STOP:
    case CMDQ_E_FAIL:
        bfa_fsm_set_state(cmdq, cmdq_sm_stopped);
        break;

    case CMDQ_E_POST:
        cmdq->flags |= BFA_MSGQ_CMDQ_F_DB_UPDATE;
        break;

    case CMDQ_E_DB_READY:
        if (cmdq->flags & BFA_MSGQ_CMDQ_F_DB_UPDATE) {
            cmdq->flags &= ~BFA_MSGQ_CMDQ_F_DB_UPDATE;
            bfa_fsm_set_state(cmdq, cmdq_sm_dbell_wait);
        } else
            bfa_fsm_set_state(cmdq, cmdq_sm_ready);
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
bfa_msgq_cmdq_dbell_ready(void *arg)
{
    struct bfa_msgq_cmdq *cmdq = (struct bfa_msgq_cmdq *)arg;
    bfa_fsm_send_event(cmdq, CMDQ_E_DB_READY);
}

static void
bfa_msgq_cmdq_dbell(struct bfa_msgq_cmdq *cmdq)
{
    struct bfi_msgq_h2i_db *dbell =
        (struct bfi_msgq_h2i_db *)(&cmdq->dbell_mb.msg[0]);

    memset(dbell, 0, sizeof(struct bfi_msgq_h2i_db));
    bfi_h2i_set(dbell->mh, BFI_MC_MSGQ, BFI_MSGQ_H2I_DOORBELL_PI, 0);
    dbell->mh.mtag.i2htok = 0;
    dbell->idx.cmdq_pi = htons(cmdq->producer_index);

    if (!bfa_nw_ioc_mbox_queue(cmdq->msgq->ioc, &cmdq->dbell_mb,
                bfa_msgq_cmdq_dbell_ready, cmdq)) {
        bfa_msgq_cmdq_dbell_ready(cmdq);
    }
}

static void
__cmd_copy(struct bfa_msgq_cmdq *cmdq, struct bfa_msgq_cmd_entry *cmd)
{
    size_t len = cmd->msg_size;
    int num_entries = 0;
    size_t to_copy;
    u8 *src, *dst;

    src = (u8 *)cmd->msg_hdr;
    dst = (u8 *)cmdq->addr.kva;
    dst += (cmdq->producer_index * BFI_MSGQ_CMD_ENTRY_SIZE);

    while (len) {
        to_copy = (len < BFI_MSGQ_CMD_ENTRY_SIZE) ?
                len : BFI_MSGQ_CMD_ENTRY_SIZE;
        memcpy(dst, src, to_copy);
        len -= to_copy;
        src += BFI_MSGQ_CMD_ENTRY_SIZE;
        BFA_MSGQ_INDX_ADD(cmdq->producer_index, 1, cmdq->depth);
        dst = (u8 *)cmdq->addr.kva;
        dst += (cmdq->producer_index * BFI_MSGQ_CMD_ENTRY_SIZE);
        num_entries++;
    }

}

static void
bfa_msgq_cmdq_ci_update(struct bfa_msgq_cmdq *cmdq, struct bfi_mbmsg *mb)
{
    struct bfi_msgq_i2h_db *dbell = (struct bfi_msgq_i2h_db *)mb;
    struct bfa_msgq_cmd_entry *cmd;
    int posted = 0;

    cmdq->consumer_index = ntohs(dbell->idx.cmdq_ci);

    /* Walk through pending list to see if the command can be posted */
    while (!list_empty(&cmdq->pending_q)) {
        cmd =
        (struct bfa_msgq_cmd_entry *)bfa_q_first(&cmdq->pending_q);
        if (ntohs(cmd->msg_hdr->num_entries) <=
            BFA_MSGQ_FREE_CNT(cmdq)) {
            list_del(&cmd->qe);
            __cmd_copy(cmdq, cmd);
            posted = 1;
            call_cmdq_ent_cbfn(cmd, BFA_STATUS_OK);
        } else {
            break;
        }
    }

    if (posted)
        bfa_fsm_send_event(cmdq, CMDQ_E_POST);
}

static void
bfa_msgq_cmdq_copy_next(void *arg)
{
    struct bfa_msgq_cmdq *cmdq = (struct bfa_msgq_cmdq *)arg;

    if (cmdq->bytes_to_copy)
        bfa_msgq_cmdq_copy_rsp(cmdq);
}

static void
bfa_msgq_cmdq_copy_req(struct bfa_msgq_cmdq *cmdq, struct bfi_mbmsg *mb)
{
    struct bfi_msgq_i2h_cmdq_copy_req *req =
        (struct bfi_msgq_i2h_cmdq_copy_req *)mb;

    cmdq->token = 0;
    cmdq->offset = ntohs(req->offset);
    cmdq->bytes_to_copy = ntohs(req->len);
    bfa_msgq_cmdq_copy_rsp(cmdq);
}

static void
bfa_msgq_cmdq_copy_rsp(struct bfa_msgq_cmdq *cmdq)
{
    struct bfi_msgq_h2i_cmdq_copy_rsp *rsp =
        (struct bfi_msgq_h2i_cmdq_copy_rsp *)&cmdq->copy_mb.msg[0];
    int copied;
    u8 *addr = (u8 *)cmdq->addr.kva;

    memset(rsp, 0, sizeof(struct bfi_msgq_h2i_cmdq_copy_rsp));
    bfi_h2i_set(rsp->mh, BFI_MC_MSGQ, BFI_MSGQ_H2I_CMDQ_COPY_RSP, 0);
    rsp->mh.mtag.i2htok = htons(cmdq->token);
    copied = (cmdq->bytes_to_copy >= BFI_CMD_COPY_SZ) ? BFI_CMD_COPY_SZ :
        cmdq->bytes_to_copy;
    addr += cmdq->offset;
    memcpy(rsp->data, addr, copied);

    cmdq->token++;
    cmdq->offset += copied;
    cmdq->bytes_to_copy -= copied;

    if (!bfa_nw_ioc_mbox_queue(cmdq->msgq->ioc, &cmdq->copy_mb,
                bfa_msgq_cmdq_copy_next, cmdq)) {
        bfa_msgq_cmdq_copy_next(cmdq);
    }
}

static void
bfa_msgq_cmdq_attach(struct bfa_msgq_cmdq *cmdq, struct bfa_msgq *msgq)
{
    cmdq->depth = BFA_MSGQ_CMDQ_NUM_ENTRY;
    INIT_LIST_HEAD(&cmdq->pending_q);
    cmdq->msgq = msgq;
    bfa_fsm_set_state(cmdq, cmdq_sm_stopped);
}

static void bfa_msgq_rspq_dbell(struct bfa_msgq_rspq *rspq);

enum rspq_event {
    RSPQ_E_START            = 1,
    RSPQ_E_STOP         = 2,
    RSPQ_E_FAIL         = 3,
    RSPQ_E_RESP         = 4,
    RSPQ_E_INIT_RESP        = 5,
    RSPQ_E_DB_READY         = 6,
};

bfa_fsm_state_decl(rspq, stopped, struct bfa_msgq_rspq, enum rspq_event);
bfa_fsm_state_decl(rspq, init_wait, struct bfa_msgq_rspq,
            enum rspq_event);
bfa_fsm_state_decl(rspq, ready, struct bfa_msgq_rspq, enum rspq_event);
bfa_fsm_state_decl(rspq, dbell_wait, struct bfa_msgq_rspq,
            enum rspq_event);

static void
rspq_sm_stopped_entry(struct bfa_msgq_rspq *rspq)
{
    rspq->producer_index = 0;
    rspq->consumer_index = 0;
    rspq->flags = 0;
}

static void
rspq_sm_stopped(struct bfa_msgq_rspq *rspq, enum rspq_event event)
{
    switch (event) {
    case RSPQ_E_START:
        bfa_fsm_set_state(rspq, rspq_sm_init_wait);
        break;

    case RSPQ_E_STOP:
    case RSPQ_E_FAIL:
        /* No-op */
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
rspq_sm_init_wait_entry(struct bfa_msgq_rspq *rspq)
{
    bfa_wc_down(&rspq->msgq->init_wc);
}

static void
rspq_sm_init_wait(struct bfa_msgq_rspq *rspq, enum rspq_event event)
{
    switch (event) {
    case RSPQ_E_FAIL:
    case RSPQ_E_STOP:
        bfa_fsm_set_state(rspq, rspq_sm_stopped);
        break;

    case RSPQ_E_INIT_RESP:
        bfa_fsm_set_state(rspq, rspq_sm_ready);
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
rspq_sm_ready_entry(struct bfa_msgq_rspq *rspq)
{
}

static void
rspq_sm_ready(struct bfa_msgq_rspq *rspq, enum rspq_event event)
{
    switch (event) {
    case RSPQ_E_STOP:
    case RSPQ_E_FAIL:
        bfa_fsm_set_state(rspq, rspq_sm_stopped);
        break;

    case RSPQ_E_RESP:
        bfa_fsm_set_state(rspq, rspq_sm_dbell_wait);
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
rspq_sm_dbell_wait_entry(struct bfa_msgq_rspq *rspq)
{
    if (!bfa_nw_ioc_is_disabled(rspq->msgq->ioc))
        bfa_msgq_rspq_dbell(rspq);
}

static void
rspq_sm_dbell_wait(struct bfa_msgq_rspq *rspq, enum rspq_event event)
{
    switch (event) {
    case RSPQ_E_STOP:
    case RSPQ_E_FAIL:
        bfa_fsm_set_state(rspq, rspq_sm_stopped);
        break;

    case RSPQ_E_RESP:
        rspq->flags |= BFA_MSGQ_RSPQ_F_DB_UPDATE;
        break;

    case RSPQ_E_DB_READY:
        if (rspq->flags & BFA_MSGQ_RSPQ_F_DB_UPDATE) {
            rspq->flags &= ~BFA_MSGQ_RSPQ_F_DB_UPDATE;
            bfa_fsm_set_state(rspq, rspq_sm_dbell_wait);
        } else
            bfa_fsm_set_state(rspq, rspq_sm_ready);
        break;

    default:
        bfa_sm_fault(event);
    }
}

static void
bfa_msgq_rspq_dbell_ready(void *arg)
{
    struct bfa_msgq_rspq *rspq = (struct bfa_msgq_rspq *)arg;
    bfa_fsm_send_event(rspq, RSPQ_E_DB_READY);
}

static void
bfa_msgq_rspq_dbell(struct bfa_msgq_rspq *rspq)
{
    struct bfi_msgq_h2i_db *dbell =
        (struct bfi_msgq_h2i_db *)(&rspq->dbell_mb.msg[0]);

    memset(dbell, 0, sizeof(struct bfi_msgq_h2i_db));
    bfi_h2i_set(dbell->mh, BFI_MC_MSGQ, BFI_MSGQ_H2I_DOORBELL_CI, 0);
    dbell->mh.mtag.i2htok = 0;
    dbell->idx.rspq_ci = htons(rspq->consumer_index);

    if (!bfa_nw_ioc_mbox_queue(rspq->msgq->ioc, &rspq->dbell_mb,
                bfa_msgq_rspq_dbell_ready, rspq)) {
        bfa_msgq_rspq_dbell_ready(rspq);
    }
}

static void
bfa_msgq_rspq_pi_update(struct bfa_msgq_rspq *rspq, struct bfi_mbmsg *mb)
{
    struct bfi_msgq_i2h_db *dbell = (struct bfi_msgq_i2h_db *)mb;
    struct bfi_msgq_mhdr *msghdr;
    int num_entries;
    int mc;
    u8 *rspq_qe;

    rspq->producer_index = ntohs(dbell->idx.rspq_pi);

    while (rspq->consumer_index != rspq->producer_index) {
        rspq_qe = (u8 *)rspq->addr.kva;
        rspq_qe += (rspq->consumer_index * BFI_MSGQ_RSP_ENTRY_SIZE);
        msghdr = (struct bfi_msgq_mhdr *)rspq_qe;

        mc = msghdr->msg_class;
        num_entries = ntohs(msghdr->num_entries);

        if ((mc >= BFI_MC_MAX) || (rspq->rsphdlr[mc].cbfn == NULL))
            break;

        (rspq->rsphdlr[mc].cbfn)(rspq->rsphdlr[mc].cbarg, msghdr);

        BFA_MSGQ_INDX_ADD(rspq->consumer_index, num_entries,
                rspq->depth);
    }

    bfa_fsm_send_event(rspq, RSPQ_E_RESP);
}

static void
bfa_msgq_rspq_attach(struct bfa_msgq_rspq *rspq, struct bfa_msgq *msgq)
{
    rspq->depth = BFA_MSGQ_RSPQ_NUM_ENTRY;
    rspq->msgq = msgq;
    bfa_fsm_set_state(rspq, rspq_sm_stopped);
}

static void
bfa_msgq_init_rsp(struct bfa_msgq *msgq,
         struct bfi_mbmsg *mb)
{
    bfa_fsm_send_event(&msgq->cmdq, CMDQ_E_INIT_RESP);
    bfa_fsm_send_event(&msgq->rspq, RSPQ_E_INIT_RESP);
}

static void
bfa_msgq_init(void *arg)
{
    struct bfa_msgq *msgq = (struct bfa_msgq *)arg;
    struct bfi_msgq_cfg_req *msgq_cfg =
        (struct bfi_msgq_cfg_req *)&msgq->init_mb.msg[0];

    memset(msgq_cfg, 0, sizeof(struct bfi_msgq_cfg_req));
    bfi_h2i_set(msgq_cfg->mh, BFI_MC_MSGQ, BFI_MSGQ_H2I_INIT_REQ, 0);
    msgq_cfg->mh.mtag.i2htok = 0;

    bfa_dma_be_addr_set(msgq_cfg->cmdq.addr, msgq->cmdq.addr.pa);
    msgq_cfg->cmdq.q_depth = htons(msgq->cmdq.depth);
    bfa_dma_be_addr_set(msgq_cfg->rspq.addr, msgq->rspq.addr.pa);
    msgq_cfg->rspq.q_depth = htons(msgq->rspq.depth);

    bfa_nw_ioc_mbox_queue(msgq->ioc, &msgq->init_mb, NULL, NULL);
}

static void
bfa_msgq_isr(void *cbarg, struct bfi_mbmsg *msg)
{
    struct bfa_msgq *msgq = (struct bfa_msgq *)cbarg;

    switch (msg->mh.msg_id) {
    case BFI_MSGQ_I2H_INIT_RSP:
        bfa_msgq_init_rsp(msgq, msg);
        break;

    case BFI_MSGQ_I2H_DOORBELL_PI:
        bfa_msgq_rspq_pi_update(&msgq->rspq, msg);
        break;

    case BFI_MSGQ_I2H_DOORBELL_CI:
        bfa_msgq_cmdq_ci_update(&msgq->cmdq, msg);
        break;

    case BFI_MSGQ_I2H_CMDQ_COPY_REQ:
        bfa_msgq_cmdq_copy_req(&msgq->cmdq, msg);
        break;

    default:
        BUG_ON(1);
    }
}

static void
bfa_msgq_notify(void *cbarg, enum bfa_ioc_event event)
{
    struct bfa_msgq *msgq = (struct bfa_msgq *)cbarg;

    switch (event) {
    case BFA_IOC_E_ENABLED:
        bfa_wc_init(&msgq->init_wc, bfa_msgq_init, msgq);
        bfa_wc_up(&msgq->init_wc);
        bfa_fsm_send_event(&msgq->cmdq, CMDQ_E_START);
        bfa_wc_up(&msgq->init_wc);
        bfa_fsm_send_event(&msgq->rspq, RSPQ_E_START);
        bfa_wc_wait(&msgq->init_wc);
        break;

    case BFA_IOC_E_DISABLED:
        bfa_fsm_send_event(&msgq->cmdq, CMDQ_E_STOP);
        bfa_fsm_send_event(&msgq->rspq, RSPQ_E_STOP);
        break;

    case BFA_IOC_E_FAILED:
        bfa_fsm_send_event(&msgq->cmdq, CMDQ_E_FAIL);
        bfa_fsm_send_event(&msgq->rspq, RSPQ_E_FAIL);
        break;

    default:
        break;
    }
}

u32
bfa_msgq_meminfo(void)
{
    return roundup(BFA_MSGQ_CMDQ_SIZE, BFA_DMA_ALIGN_SZ) +
        roundup(BFA_MSGQ_RSPQ_SIZE, BFA_DMA_ALIGN_SZ);
}

void
bfa_msgq_memclaim(struct bfa_msgq *msgq, u8 *kva, u64 pa)
{
    msgq->cmdq.addr.kva = kva;
    msgq->cmdq.addr.pa  = pa;

    kva += roundup(BFA_MSGQ_CMDQ_SIZE, BFA_DMA_ALIGN_SZ);
    pa += roundup(BFA_MSGQ_CMDQ_SIZE, BFA_DMA_ALIGN_SZ);

    msgq->rspq.addr.kva = kva;
    msgq->rspq.addr.pa = pa;
}

void
bfa_msgq_attach(struct bfa_msgq *msgq, struct bfa_ioc *ioc)
{
    msgq->ioc    = ioc;

    bfa_msgq_cmdq_attach(&msgq->cmdq, msgq);
    bfa_msgq_rspq_attach(&msgq->rspq, msgq);

    bfa_nw_ioc_mbox_regisr(msgq->ioc, BFI_MC_MSGQ, bfa_msgq_isr, msgq);
    bfa_q_qe_init(&msgq->ioc_notify);
    bfa_ioc_notify_init(&msgq->ioc_notify, bfa_msgq_notify, msgq);
    bfa_nw_ioc_notify_register(msgq->ioc, &msgq->ioc_notify);
}

void
bfa_msgq_regisr(struct bfa_msgq *msgq, enum bfi_mclass mc,
        bfa_msgq_mcfunc_t cbfn, void *cbarg)
{
    msgq->rspq.rsphdlr[mc].cbfn = cbfn;
    msgq->rspq.rsphdlr[mc].cbarg    = cbarg;
}

void
bfa_msgq_cmd_post(struct bfa_msgq *msgq,  struct bfa_msgq_cmd_entry *cmd)
{
    if (ntohs(cmd->msg_hdr->num_entries) <=
        BFA_MSGQ_FREE_CNT(&msgq->cmdq)) {
        __cmd_copy(&msgq->cmdq, cmd);
        call_cmdq_ent_cbfn(cmd, BFA_STATUS_OK);
        bfa_fsm_send_event(&msgq->cmdq, CMDQ_E_POST);
    } else {
        list_add_tail(&cmd->qe, &msgq->cmdq.pending_q);
    }
}

void
bfa_msgq_rsp_copy(struct bfa_msgq *msgq, u8 *buf, size_t buf_len)
{
    struct bfa_msgq_rspq *rspq = &msgq->rspq;
    size_t len = buf_len;
    size_t to_copy;
    int ci;
    u8 *src, *dst;

    ci = rspq->consumer_index;
    src = (u8 *)rspq->addr.kva;
    src += (ci * BFI_MSGQ_RSP_ENTRY_SIZE);
    dst = buf;

    while (len) {
        to_copy = (len < BFI_MSGQ_RSP_ENTRY_SIZE) ?
                len : BFI_MSGQ_RSP_ENTRY_SIZE;
        memcpy(dst, src, to_copy);
        len -= to_copy;
        dst += BFI_MSGQ_RSP_ENTRY_SIZE;
        BFA_MSGQ_INDX_ADD(ci, 1, rspq->depth);
        src = (u8 *)rspq->addr.kva;
        src += (ci * BFI_MSGQ_RSP_ENTRY_SIZE);
    }
}