/**********************************************************************
 * 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.
 ***********************************************************************/
/*! \file octeon_main.h
 *  \brief Host Driver: This file is included by all host driver source files
 *  to include common definitions.
 */

#ifndef _OCTEON_MAIN_H_
#define  _OCTEON_MAIN_H_

#include <linux/sched/signal.h>

#if BITS_PER_LONG == 32
#define CVM_CAST64(v) ((long long)(v))
#elif BITS_PER_LONG == 64
#define CVM_CAST64(v) ((long long)(long)(v))
#else
#error "Unknown system architecture"
#endif

#define DRV_NAME "LiquidIO"

struct octeon_device_priv {
        /** Tasklet structures for this device. */
        struct tasklet_struct droq_tasklet;
        unsigned long napi_mask;
};

/** This structure is used by NIC driver to store information required
 * to free the sk_buff when the packet has been fetched by Octeon.
 * Bytes offset below assume worst-case of a 64-bit system.
 */
struct octnet_buf_free_info {
        /** Bytes 1-8.  Pointer to network device private structure. */
        struct lio *lio;

        /** Bytes 9-16.  Pointer to sk_buff. */
        struct sk_buff *skb;

        /** Bytes 17-24.  Pointer to gather list. */
        struct octnic_gather *g;

        /** Bytes 25-32. Physical address of skb->data or gather list. */
        u64 dptr;

        /** Bytes 33-47. Piggybacked soft command, if any */
        struct octeon_soft_command *sc;
};

/* BQL-related functions */
int octeon_report_sent_bytes_to_bql(void *buf, int reqtype);
void octeon_update_tx_completion_counters(void *buf, int reqtype,
                                          unsigned int *pkts_compl,
                                          unsigned int *bytes_compl);
void octeon_report_tx_completion_to_bql(void *txq, unsigned int pkts_compl,
                                        unsigned int bytes_compl);
void octeon_pf_changed_vf_macaddr(struct octeon_device *oct, u8 *mac);

void octeon_schedule_rxq_oom_work(struct octeon_device *oct,
                                  struct octeon_droq *droq);

/** Swap 8B blocks */
static inline void octeon_swap_8B_data(u64 *data, u32 blocks)
{
        while (blocks) {
                cpu_to_be64s(data);
                blocks--;
                data++;
        }
}

/**
 * \brief unmaps a PCI BAR
 * @param oct Pointer to Octeon device
 * @param baridx bar index
 */
static inline void octeon_unmap_pci_barx(struct octeon_device *oct, int baridx)
{
        dev_dbg(&oct->pci_dev->dev, "Freeing PCI mapped regions for Bar%d\n",
                baridx);

        if (oct->mmio[baridx].done)
                iounmap(oct->mmio[baridx].hw_addr);

        if (oct->mmio[baridx].start)
                pci_release_region(oct->pci_dev, baridx * 2);
}

/**
 * \brief maps a PCI BAR
 * @param oct Pointer to Octeon device
 * @param baridx bar index
 * @param max_map_len maximum length of mapped memory
 */
static inline int octeon_map_pci_barx(struct octeon_device *oct,
                                      int baridx, int max_map_len)
{
        u32 mapped_len = 0;

        if (pci_request_region(oct->pci_dev, baridx * 2, DRV_NAME)) {
                dev_err(&oct->pci_dev->dev, "pci_request_region failed for bar %d\n",
                        baridx);
                return 1;
        }

        oct->mmio[baridx].start = pci_resource_start(oct->pci_dev, baridx * 2);
        oct->mmio[baridx].len = pci_resource_len(oct->pci_dev, baridx * 2);

        mapped_len = oct->mmio[baridx].len;
        if (!mapped_len)
                goto err_release_region;

        if (max_map_len && (mapped_len > max_map_len))
                mapped_len = max_map_len;

        oct->mmio[baridx].hw_addr =
                ioremap(oct->mmio[baridx].start, mapped_len);
        oct->mmio[baridx].mapped_len = mapped_len;

        dev_dbg(&oct->pci_dev->dev, "BAR%d start: 0x%llx mapped %u of %u bytes\n",
                baridx, oct->mmio[baridx].start, mapped_len,
                oct->mmio[baridx].len);

        if (!oct->mmio[baridx].hw_addr) {
                dev_err(&oct->pci_dev->dev, "error ioremap for bar %d\n",
                        baridx);
                goto err_release_region;
        }
        oct->mmio[baridx].done = 1;

        return 0;

err_release_region:
        pci_release_region(oct->pci_dev, baridx * 2);
        return 1;
}

/* input parameter:
 * sc: pointer to a soft request
 * timeout: milli sec which an application wants to wait for the
            response of the request.
 *          0: the request will wait until its response gets back
 *             from the firmware within LIO_SC_MAX_TMO_MS milli sec.
 *             It the response does not return within
 *             LIO_SC_MAX_TMO_MS milli sec, lio_process_ordered_list()
 *             will move the request to zombie response list.
 *
 * return value:
 * 0: got the response from firmware for the sc request.
 * errno -EINTR: user abort the command.
 * errno -ETIME: user spefified timeout value has been expired.
 * errno -EBUSY: the response of the request does not return in
 *               resonable time (LIO_SC_MAX_TMO_MS).
 *               the sc wll be move to zombie response list by
 *               lio_process_ordered_list()
 *
 * A request with non-zero return value, the sc->caller_is_done
 *  will be marked 1.
 * When getting a request with zero return value, the requestor
 *  should mark sc->caller_is_done with 1 after examing the
 *  response of sc.
 * lio_process_ordered_list() will free the soft command on behalf
 * of the soft command requestor.
 * This is to fix the possible race condition of both timeout process
 * and lio_process_ordered_list()/callback function to free a
 * sc strucutre.
 */
static inline int
wait_for_sc_completion_timeout(struct octeon_device *oct_dev,
                               struct octeon_soft_command *sc,
                               unsigned long timeout)
{
        int errno = 0;
        long timeout_jiff;

        if (timeout)
                timeout_jiff = msecs_to_jiffies(timeout);
        else
                timeout_jiff = MAX_SCHEDULE_TIMEOUT;

        timeout_jiff =
                wait_for_completion_interruptible_timeout(&sc->complete,
                                                          timeout_jiff);
        if (timeout_jiff == 0) {
                dev_err(&oct_dev->pci_dev->dev, "%s: sc is timeout\n",
                        __func__);
                WRITE_ONCE(sc->caller_is_done, true);
                errno = -ETIME;
        } else if (timeout_jiff == -ERESTARTSYS) {
                dev_err(&oct_dev->pci_dev->dev, "%s: sc is interrupted\n",
                        __func__);
                WRITE_ONCE(sc->caller_is_done, true);
                errno = -EINTR;
        } else  if (sc->sc_status == OCTEON_REQUEST_TIMEOUT) {
                dev_err(&oct_dev->pci_dev->dev, "%s: sc has fatal timeout\n",
                        __func__);
                WRITE_ONCE(sc->caller_is_done, true);
                errno = -EBUSY;
        }

        return errno;
}

#ifndef ROUNDUP4
#define ROUNDUP4(val) (((val) + 3) & 0xfffffffc)
#endif

#ifndef ROUNDUP8
#define ROUNDUP8(val) (((val) + 7) & 0xfffffff8)
#endif

#ifndef ROUNDUP16
#define ROUNDUP16(val) (((val) + 15) & 0xfffffff0)
#endif

#ifndef ROUNDUP128
#define ROUNDUP128(val) (((val) + 127) & 0xffffff80)
#endif

#endif /* _OCTEON_MAIN_H_ */