/*******************************************************************************

  Intel PRO/10GbE Linux driver
  Copyright(c) 1999 - 2008 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope 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.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "ixgb.h"

/* This is the only thing that needs to be changed to adjust the
 * maximum number of ports that the driver can manage.
 */

#define IXGB_MAX_NIC 8

#define OPTION_UNSET    -1
#define OPTION_DISABLED 0
#define OPTION_ENABLED  1

/* All parameters are treated the same, as an integer array of values.
 * This macro just reduces the need to repeat the same declaration code
 * over and over (plus this helps to avoid typo bugs).
 */

#define IXGB_PARAM_INIT { [0 ... IXGB_MAX_NIC] = OPTION_UNSET }
#define IXGB_PARAM(X, desc)                                     \
        static int X[IXGB_MAX_NIC+1]            \
                = IXGB_PARAM_INIT;                              \
        static unsigned int num_##X = 0;                        \
        module_param_array_named(X, X, int, &num_##X, 0);       \
        MODULE_PARM_DESC(X, desc);

/* Transmit Descriptor Count
 *
 * Valid Range: 64-4096
 *
 * Default Value: 256
 */

IXGB_PARAM(TxDescriptors, "Number of transmit descriptors");

/* Receive Descriptor Count
 *
 * Valid Range: 64-4096
 *
 * Default Value: 1024
 */

IXGB_PARAM(RxDescriptors, "Number of receive descriptors");

/* User Specified Flow Control Override
 *
 * Valid Range: 0-3
 *  - 0 - No Flow Control
 *  - 1 - Rx only, respond to PAUSE frames but do not generate them
 *  - 2 - Tx only, generate PAUSE frames but ignore them on receive
 *  - 3 - Full Flow Control Support
 *
 * Default Value: 2 - Tx only (silicon bug avoidance)
 */

IXGB_PARAM(FlowControl, "Flow Control setting");

/* XsumRX - Receive Checksum Offload Enable/Disable
 *
 * Valid Range: 0, 1
 *  - 0 - disables all checksum offload
 *  - 1 - enables receive IP/TCP/UDP checksum offload
 *        on 82597 based NICs
 *
 * Default Value: 1
 */

IXGB_PARAM(XsumRX, "Disable or enable Receive Checksum offload");

/* Transmit Interrupt Delay in units of 0.8192 microseconds
 *
 * Valid Range: 0-65535
 *
 * Default Value: 32
 */

IXGB_PARAM(TxIntDelay, "Transmit Interrupt Delay");

/* Receive Interrupt Delay in units of 0.8192 microseconds
 *
 * Valid Range: 0-65535
 *
 * Default Value: 72
 */

IXGB_PARAM(RxIntDelay, "Receive Interrupt Delay");

/* Receive Flow control high threshold (when we send a pause frame)
 * (FCRTH)
 *
 * Valid Range: 1,536 - 262,136 (0x600 - 0x3FFF8, 8 byte granularity)
 *
 * Default Value: 196,608 (0x30000)
 */

IXGB_PARAM(RxFCHighThresh, "Receive Flow Control High Threshold");

/* Receive Flow control low threshold (when we send a resume frame)
 * (FCRTL)
 *
 * Valid Range: 64 - 262,136 (0x40 - 0x3FFF8, 8 byte granularity)
 *              must be less than high threshold by at least 8 bytes
 *
 * Default Value:  163,840 (0x28000)
 */

IXGB_PARAM(RxFCLowThresh, "Receive Flow Control Low Threshold");

/* Flow control request timeout (how long to pause the link partner's tx)
 * (PAP 15:0)
 *
 * Valid Range: 1 - 65535
 *
 * Default Value:  65535 (0xffff) (we'll send an xon if we recover)
 */

IXGB_PARAM(FCReqTimeout, "Flow Control Request Timeout");

/* Interrupt Delay Enable
 *
 * Valid Range: 0, 1
 *
 *  - 0 - disables transmit interrupt delay
 *  - 1 - enables transmmit interrupt delay
 *
 * Default Value: 1
 */

IXGB_PARAM(IntDelayEnable, "Transmit Interrupt Delay Enable");


#define DEFAULT_TIDV                         32
#define MAX_TIDV                         0xFFFF
#define MIN_TIDV                              0

#define DEFAULT_RDTR                         72
#define MAX_RDTR                         0xFFFF
#define MIN_RDTR                              0

#define XSUMRX_DEFAULT           OPTION_ENABLED

#define DEFAULT_FCRTL                   0x28000
#define DEFAULT_FCRTH                   0x30000
#define MIN_FCRTL                             0
#define MAX_FCRTL                       0x3FFE8
#define MIN_FCRTH                             8
#define MAX_FCRTH                       0x3FFF0

#define MIN_FCPAUSE                           1
#define MAX_FCPAUSE                      0xffff
#define DEFAULT_FCPAUSE                  0xFFFF /* this may be too long */

struct ixgb_option {
        enum { enable_option, range_option, list_option } type;
        const char *name;
        const char *err;
        int def;
        union {
                struct {        /* range_option info */
                        int min;
                        int max;
                } r;
                struct {        /* list_option info */
                        int nr;
                        const struct ixgb_opt_list {
                                int i;
                                const char *str;
                        } *p;
                } l;
        } arg;
};

static int
ixgb_validate_option(unsigned int *value, const struct ixgb_option *opt)
{
        if (*value == OPTION_UNSET) {
                *value = opt->def;
                return 0;
        }

        switch (opt->type) {
        case enable_option:
                switch (*value) {
                case OPTION_ENABLED:
                        pr_info("%s Enabled\n", opt->name);
                        return 0;
                case OPTION_DISABLED:
                        pr_info("%s Disabled\n", opt->name);
                        return 0;
                }
                break;
        case range_option:
                if (*value >= opt->arg.r.min && *value <= opt->arg.r.max) {
                        pr_info("%s set to %i\n", opt->name, *value);
                        return 0;
                }
                break;
        case list_option: {
                int i;
                const struct ixgb_opt_list *ent;

                for (i = 0; i < opt->arg.l.nr; i++) {
                        ent = &opt->arg.l.p[i];
                        if (*value == ent->i) {
                                if (ent->str[0] != '\0')
                                        pr_info("%s\n", ent->str);
                                return 0;
                        }
                }
        }
                break;
        default:
                BUG();
        }

        pr_info("Invalid %s specified (%i) %s\n", opt->name, *value, opt->err);
        *value = opt->def;
        return -1;
}

/**
 * ixgb_check_options - Range Checking for Command Line Parameters
 * @adapter: board private structure
 *
 * This routine checks all command line parameters for valid user
 * input.  If an invalid value is given, or if no user specified
 * value exists, a default value is used.  The final value is stored
 * in a variable in the adapter structure.
 **/

void
ixgb_check_options(struct ixgb_adapter *adapter)
{
        int bd = adapter->bd_number;
        if (bd >= IXGB_MAX_NIC) {
                pr_notice("Warning: no configuration for board #%i\n", bd);
                pr_notice("Using defaults for all values\n");
        }

        { /* Transmit Descriptor Count */
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Transmit Descriptors",
                        .err  = "using default of " __MODULE_STRING(DEFAULT_TXD),
                        .def  = DEFAULT_TXD,
                        .arg  = { .r = { .min = MIN_TXD,
                                         .max = MAX_TXD}}
                };
                struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;

                if (num_TxDescriptors > bd) {
                        tx_ring->count = TxDescriptors[bd];
                        ixgb_validate_option(&tx_ring->count, &opt);
                } else {
                        tx_ring->count = opt.def;
                }
                tx_ring->count = ALIGN(tx_ring->count, IXGB_REQ_TX_DESCRIPTOR_MULTIPLE);
        }
        { /* Receive Descriptor Count */
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Receive Descriptors",
                        .err  = "using default of " __MODULE_STRING(DEFAULT_RXD),
                        .def  = DEFAULT_RXD,
                        .arg  = { .r = { .min = MIN_RXD,
                                         .max = MAX_RXD}}
                };
                struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;

                if (num_RxDescriptors > bd) {
                        rx_ring->count = RxDescriptors[bd];
                        ixgb_validate_option(&rx_ring->count, &opt);
                } else {
                        rx_ring->count = opt.def;
                }
                rx_ring->count = ALIGN(rx_ring->count, IXGB_REQ_RX_DESCRIPTOR_MULTIPLE);
        }
        { /* Receive Checksum Offload Enable */
                static const struct ixgb_option opt = {
                        .type = enable_option,
                        .name = "Receive Checksum Offload",
                        .err  = "defaulting to Enabled",
                        .def  = OPTION_ENABLED
                };

                if (num_XsumRX > bd) {
                        unsigned int rx_csum = XsumRX[bd];
                        ixgb_validate_option(&rx_csum, &opt);
                        adapter->rx_csum = rx_csum;
                } else {
                        adapter->rx_csum = opt.def;
                }
        }
        { /* Flow Control */

                static const struct ixgb_opt_list fc_list[] = {
                       { ixgb_fc_none, "Flow Control Disabled" },
                       { ixgb_fc_rx_pause, "Flow Control Receive Only" },
                       { ixgb_fc_tx_pause, "Flow Control Transmit Only" },
                       { ixgb_fc_full, "Flow Control Enabled" },
                       { ixgb_fc_default, "Flow Control Hardware Default" }
                };

                static const struct ixgb_option opt = {
                        .type = list_option,
                        .name = "Flow Control",
                        .err  = "reading default settings from EEPROM",
                        .def  = ixgb_fc_tx_pause,
                        .arg  = { .l = { .nr = ARRAY_SIZE(fc_list),
                                         .p = fc_list }}
                };

                if (num_FlowControl > bd) {
                        unsigned int fc = FlowControl[bd];
                        ixgb_validate_option(&fc, &opt);
                        adapter->hw.fc.type = fc;
                } else {
                        adapter->hw.fc.type = opt.def;
                }
        }
        { /* Receive Flow Control High Threshold */
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Rx Flow Control High Threshold",
                        .err  = "using default of " __MODULE_STRING(DEFAULT_FCRTH),
                        .def  = DEFAULT_FCRTH,
                        .arg  = { .r = { .min = MIN_FCRTH,
                                         .max = MAX_FCRTH}}
                };

                if (num_RxFCHighThresh > bd) {
                        adapter->hw.fc.high_water = RxFCHighThresh[bd];
                        ixgb_validate_option(&adapter->hw.fc.high_water, &opt);
                } else {
                        adapter->hw.fc.high_water = opt.def;
                }
                if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
                        pr_info("Ignoring RxFCHighThresh when no RxFC\n");
        }
        { /* Receive Flow Control Low Threshold */
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Rx Flow Control Low Threshold",
                        .err  = "using default of " __MODULE_STRING(DEFAULT_FCRTL),
                        .def  = DEFAULT_FCRTL,
                        .arg  = { .r = { .min = MIN_FCRTL,
                                         .max = MAX_FCRTL}}
                };

                if (num_RxFCLowThresh > bd) {
                        adapter->hw.fc.low_water = RxFCLowThresh[bd];
                        ixgb_validate_option(&adapter->hw.fc.low_water, &opt);
                } else {
                        adapter->hw.fc.low_water = opt.def;
                }
                if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
                        pr_info("Ignoring RxFCLowThresh when no RxFC\n");
        }
        { /* Flow Control Pause Time Request*/
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Flow Control Pause Time Request",
                        .err  = "using default of "__MODULE_STRING(DEFAULT_FCPAUSE),
                        .def  = DEFAULT_FCPAUSE,
                        .arg = { .r = { .min = MIN_FCPAUSE,
                                        .max = MAX_FCPAUSE}}
                };

                if (num_FCReqTimeout > bd) {
                        unsigned int pause_time = FCReqTimeout[bd];
                        ixgb_validate_option(&pause_time, &opt);
                        adapter->hw.fc.pause_time = pause_time;
                } else {
                        adapter->hw.fc.pause_time = opt.def;
                }
                if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
                        pr_info("Ignoring FCReqTimeout when no RxFC\n");
        }
        /* high low and spacing check for rx flow control thresholds */
        if (adapter->hw.fc.type & ixgb_fc_tx_pause) {
                /* high must be greater than low */
                if (adapter->hw.fc.high_water < (adapter->hw.fc.low_water + 8)) {
                        /* set defaults */
                        pr_info("RxFCHighThresh must be >= (RxFCLowThresh + 8), Using Defaults\n");
                        adapter->hw.fc.high_water = DEFAULT_FCRTH;
                        adapter->hw.fc.low_water  = DEFAULT_FCRTL;
                }
        }
        { /* Receive Interrupt Delay */
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Receive Interrupt Delay",
                        .err  = "using default of " __MODULE_STRING(DEFAULT_RDTR),
                        .def  = DEFAULT_RDTR,
                        .arg  = { .r = { .min = MIN_RDTR,
                                         .max = MAX_RDTR}}
                };

                if (num_RxIntDelay > bd) {
                        adapter->rx_int_delay = RxIntDelay[bd];
                        ixgb_validate_option(&adapter->rx_int_delay, &opt);
                } else {
                        adapter->rx_int_delay = opt.def;
                }
        }
        { /* Transmit Interrupt Delay */
                static const struct ixgb_option opt = {
                        .type = range_option,
                        .name = "Transmit Interrupt Delay",
                        .err  = "using default of " __MODULE_STRING(DEFAULT_TIDV),
                        .def  = DEFAULT_TIDV,
                        .arg  = { .r = { .min = MIN_TIDV,
                                         .max = MAX_TIDV}}
                };

                if (num_TxIntDelay > bd) {
                        adapter->tx_int_delay = TxIntDelay[bd];
                        ixgb_validate_option(&adapter->tx_int_delay, &opt);
                } else {
                        adapter->tx_int_delay = opt.def;
                }
        }

        { /* Transmit Interrupt Delay Enable */
                static const struct ixgb_option opt = {
                        .type = enable_option,
                        .name = "Tx Interrupt Delay Enable",
                        .err  = "defaulting to Enabled",
                        .def  = OPTION_ENABLED
                };

                if (num_IntDelayEnable > bd) {
                        unsigned int ide = IntDelayEnable[bd];
                        ixgb_validate_option(&ide, &opt);
                        adapter->tx_int_delay_enable = ide;
                } else {
                        adapter->tx_int_delay_enable = opt.def;
                }
        }
}