/**********************************************************************
 * Author: Cavium, Inc.
 *
 * Contact: support@cavium.com
 *          Please include "LiquidIO" in the subject.
 *
 * Copyright (c) 2003-2016 Cavium, Inc.
 *
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, Version 2, as
 * published by the Free Software Foundation.
 *
 * This file is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT.  See the GNU General Public License for more
 * details.
 **********************************************************************/
#include <linux/pci.h>
#include <linux/netdevice.h>
#include "liquidio_common.h"
#include "octeon_droq.h"
#include "octeon_iq.h"
#include "response_manager.h"
#include "octeon_device.h"
#include "octeon_nic.h"
#include "octeon_main.h"

void *
octeon_alloc_soft_command_resp(struct octeon_device    *oct,
                               union octeon_instr_64B *cmd,
                               u32                     rdatasize)
{
        struct octeon_soft_command *sc;
        struct octeon_instr_ih3  *ih3;
        struct octeon_instr_ih2  *ih2;
        struct octeon_instr_irh *irh;
        struct octeon_instr_rdp *rdp;

        sc = (struct octeon_soft_command *)
                octeon_alloc_soft_command(oct, 0, rdatasize, 0);

        if (!sc)
                return NULL;

        /* Copy existing command structure into the soft command */
        memcpy(&sc->cmd, cmd, sizeof(union octeon_instr_64B));

        /* Add in the response related fields. Opcode and Param are already
         * there.
         */
        if (OCTEON_CN23XX_PF(oct) || OCTEON_CN23XX_VF(oct)) {
                ih3      = (struct octeon_instr_ih3 *)&sc->cmd.cmd3.ih3;
                rdp     = (struct octeon_instr_rdp *)&sc->cmd.cmd3.rdp;
                irh     = (struct octeon_instr_irh *)&sc->cmd.cmd3.irh;
                /*pkiih3 + irh + ossp[0] + ossp[1] + rdp + rptr = 40 bytes */
                ih3->fsz = LIO_SOFTCMDRESP_IH3;
        } else {
                ih2      = (struct octeon_instr_ih2 *)&sc->cmd.cmd2.ih2;
                rdp     = (struct octeon_instr_rdp *)&sc->cmd.cmd2.rdp;
                irh     = (struct octeon_instr_irh *)&sc->cmd.cmd2.irh;
                /* irh + ossp[0] + ossp[1] + rdp + rptr = 40 bytes */
                ih2->fsz = LIO_SOFTCMDRESP_IH2;
        }

        irh->rflag = 1; /* a response is required */

        rdp->pcie_port = oct->pcie_port;
        rdp->rlen      = rdatasize;

        *sc->status_word = COMPLETION_WORD_INIT;

        if (OCTEON_CN23XX_PF(oct) || OCTEON_CN23XX_VF(oct))
                sc->cmd.cmd3.rptr =  sc->dmarptr;
        else
                sc->cmd.cmd2.rptr =  sc->dmarptr;

        sc->expiry_time = jiffies + msecs_to_jiffies(LIO_SC_MAX_TMO_MS);

        return sc;
}

int octnet_send_nic_data_pkt(struct octeon_device *oct,
                             struct octnic_data_pkt *ndata,
                             int xmit_more)
{
        int ring_doorbell = !xmit_more;

        return octeon_send_command(oct, ndata->q_no, ring_doorbell, &ndata->cmd,
                                   ndata->buf, ndata->datasize,
                                   ndata->reqtype);
}

static inline struct octeon_soft_command
*octnic_alloc_ctrl_pkt_sc(struct octeon_device *oct,
                          struct octnic_ctrl_pkt *nctrl)
{
        struct octeon_soft_command *sc = NULL;
        u8 *data;
        u32 rdatasize;
        u32 uddsize = 0, datasize = 0;

        uddsize = (u32)(nctrl->ncmd.s.more * 8);

        datasize = OCTNET_CMD_SIZE + uddsize;
        rdatasize = 16;

        sc = (struct octeon_soft_command *)
                octeon_alloc_soft_command(oct, datasize, rdatasize, 0);

        if (!sc)
                return NULL;

        data = (u8 *)sc->virtdptr;

        memcpy(data, &nctrl->ncmd, OCTNET_CMD_SIZE);

        octeon_swap_8B_data((u64 *)data, (OCTNET_CMD_SIZE >> 3));

        if (uddsize) {
                /* Endian-Swap for UDD should have been done by caller. */
                memcpy(data + OCTNET_CMD_SIZE, nctrl->udd, uddsize);
        }

        sc->iq_no = (u32)nctrl->iq_no;

        octeon_prepare_soft_command(oct, sc, OPCODE_NIC, OPCODE_NIC_CMD,
                                    0, 0, 0);

        init_completion(&sc->complete);
        sc->sc_status = OCTEON_REQUEST_PENDING;

        return sc;
}

int
octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
                         struct octnic_ctrl_pkt *nctrl)
{
        int retval;
        struct octeon_soft_command *sc = NULL;

        spin_lock_bh(&oct->cmd_resp_wqlock);
        /* Allow only rx ctrl command to stop traffic on the chip
         * during offline operations
         */
        if ((oct->cmd_resp_state == OCT_DRV_OFFLINE) &&
            (nctrl->ncmd.s.cmd != OCTNET_CMD_RX_CTL)) {
                spin_unlock_bh(&oct->cmd_resp_wqlock);
                dev_err(&oct->pci_dev->dev,
                        "%s cmd:%d not processed since driver offline\n",
                        __func__, nctrl->ncmd.s.cmd);
                return -1;
        }

        sc = octnic_alloc_ctrl_pkt_sc(oct, nctrl);
        if (!sc) {
                dev_err(&oct->pci_dev->dev, "%s soft command alloc failed\n",
                        __func__);
                spin_unlock_bh(&oct->cmd_resp_wqlock);
                return -1;
        }

        retval = octeon_send_soft_command(oct, sc);
        if (retval == IQ_SEND_FAILED) {
                octeon_free_soft_command(oct, sc);
                dev_err(&oct->pci_dev->dev, "%s pf_num:%d soft command:%d send failed status: %x\n",
                        __func__, oct->pf_num, nctrl->ncmd.s.cmd, retval);
                spin_unlock_bh(&oct->cmd_resp_wqlock);
                return -1;
        }

        spin_unlock_bh(&oct->cmd_resp_wqlock);

        if (nctrl->ncmd.s.cmdgroup == 0) {
                switch (nctrl->ncmd.s.cmd) {
                        /* caller holds lock, can not sleep */
                case OCTNET_CMD_CHANGE_DEVFLAGS:
                case OCTNET_CMD_SET_MULTI_LIST:
                case OCTNET_CMD_SET_UC_LIST:
                        WRITE_ONCE(sc->caller_is_done, true);
                        return retval;
                }
        }

        retval = wait_for_sc_completion_timeout(oct, sc, 0);
        if (retval)
                return (retval);

        nctrl->sc_status = sc->sc_status;
        retval = nctrl->sc_status;
        if (nctrl->cb_fn)
                nctrl->cb_fn(nctrl);

        WRITE_ONCE(sc->caller_is_done, true);

        return retval;
}