drivers/net/ixgb/ixgb_param.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2008 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include "ixgb.h"
  32
  33 /* This is the only thing that needs to be changed to adjust the
  34  * maximum number of ports that the driver can manage.
  35  */
  36
  37 #define IXGB_MAX_NIC 8
  38
  39 #define OPTION_UNSET    -1
  40 #define OPTION_DISABLED 0
  41 #define OPTION_ENABLED  1
  42
  43 /* All parameters are treated the same, as an integer array of values.
  44  * This macro just reduces the need to repeat the same declaration code
  45  * over and over (plus this helps to avoid typo bugs).
  46  */
  47
  48 #define IXGB_PARAM_INIT { [0 ... IXGB_MAX_NIC] = OPTION_UNSET }
  49 #define IXGB_PARAM(X, desc)                                     \
  50         static int __devinitdata X[IXGB_MAX_NIC+1]              \
  51                 = IXGB_PARAM_INIT;                              \
  52         static unsigned int num_##X = 0;                        \
  53         module_param_array_named(X, X, int, &num_##X, 0);       \
  54         MODULE_PARM_DESC(X, desc);
  55
  56 /* Transmit Descriptor Count
  57  *
  58  * Valid Range: 64-4096
  59  *
  60  * Default Value: 256
  61  */
  62
  63 IXGB_PARAM(TxDescriptors, "Number of transmit descriptors");
  64
  65 /* Receive Descriptor Count
  66  *
  67  * Valid Range: 64-4096
  68  *
  69  * Default Value: 1024
  70  */
  71
  72 IXGB_PARAM(RxDescriptors, "Number of receive descriptors");
  73
  74 /* User Specified Flow Control Override
  75  *
  76  * Valid Range: 0-3
  77  *  - 0 - No Flow Control
  78  *  - 1 - Rx only, respond to PAUSE frames but do not generate them
  79  *  - 2 - Tx only, generate PAUSE frames but ignore them on receive
  80  *  - 3 - Full Flow Control Support
  81  *
  82  * Default Value: 2 - Tx only (silicon bug avoidance)
  83  */
  84
  85 IXGB_PARAM(FlowControl, "Flow Control setting");
  86
  87 /* XsumRX - Receive Checksum Offload Enable/Disable
  88  *
  89  * Valid Range: 0, 1
  90  *  - 0 - disables all checksum offload
  91  *  - 1 - enables receive IP/TCP/UDP checksum offload
  92  *        on 82597 based NICs
  93  *
  94  * Default Value: 1
  95  */
  96
  97 IXGB_PARAM(XsumRX, "Disable or enable Receive Checksum offload");
  98
  99 /* Transmit Interrupt Delay in units of 0.8192 microseconds
 100  *
 101  * Valid Range: 0-65535
 102  *
 103  * Default Value: 32
 104  */
 105
 106 IXGB_PARAM(TxIntDelay, "Transmit Interrupt Delay");
 107
 108 /* Receive Interrupt Delay in units of 0.8192 microseconds
 109  *
 110  * Valid Range: 0-65535
 111  *
 112  * Default Value: 72
 113  */
 114
 115 IXGB_PARAM(RxIntDelay, "Receive Interrupt Delay");
 116
 117 /* Receive Flow control high threshold (when we send a pause frame)
 118  * (FCRTH)
 119  *
 120  * Valid Range: 1,536 - 262,136 (0x600 - 0x3FFF8, 8 byte granularity)
 121  *
 122  * Default Value: 196,608 (0x30000)
 123  */
 124
 125 IXGB_PARAM(RxFCHighThresh, "Receive Flow Control High Threshold");
 126
 127 /* Receive Flow control low threshold (when we send a resume frame)
 128  * (FCRTL)
 129  *
 130  * Valid Range: 64 - 262,136 (0x40 - 0x3FFF8, 8 byte granularity)
 131  *              must be less than high threshold by at least 8 bytes
 132  *
 133  * Default Value:  163,840 (0x28000)
 134  */
 135
 136 IXGB_PARAM(RxFCLowThresh, "Receive Flow Control Low Threshold");
 137
 138 /* Flow control request timeout (how long to pause the link partner's tx)
 139  * (PAP 15:0)
 140  *
 141  * Valid Range: 1 - 65535
 142  *
 143  * Default Value:  65535 (0xffff) (we'll send an xon if we recover)
 144  */
 145
 146 IXGB_PARAM(FCReqTimeout, "Flow Control Request Timeout");
 147
 148 /* Interrupt Delay Enable
 149  *
 150  * Valid Range: 0, 1
 151  *
 152  *  - 0 - disables transmit interrupt delay
 153  *  - 1 - enables transmmit interrupt delay
 154  *
 155  * Default Value: 1
 156  */
 157
 158 IXGB_PARAM(IntDelayEnable, "Transmit Interrupt Delay Enable");
 159
 160
 161 #define DEFAULT_TIDV                         32
 162 #define MAX_TIDV                         0xFFFF
 163 #define MIN_TIDV                              0
 164
 165 #define DEFAULT_RDTR                         72
 166 #define MAX_RDTR                         0xFFFF
 167 #define MIN_RDTR                              0
 168
 169 #define XSUMRX_DEFAULT           OPTION_ENABLED
 170
 171 #define DEFAULT_FCRTL                   0x28000
 172 #define DEFAULT_FCRTH                   0x30000
 173 #define MIN_FCRTL                             0
 174 #define MAX_FCRTL                       0x3FFE8
 175 #define MIN_FCRTH                             8
 176 #define MAX_FCRTH                       0x3FFF0
 177
 178 #define MIN_FCPAUSE                           1
 179 #define MAX_FCPAUSE                      0xffff
 180 #define DEFAULT_FCPAUSE                  0xFFFF /* this may be too long */
 181
 182 struct ixgb_option {
 183         enum { enable_option, range_option, list_option } type;
 184         const char *name;
 185         const char *err;
 186         int def;
 187         union {
 188                 struct {        /* range_option info */
 189                         int min;
 190                         int max;
 191                 } r;
 192                 struct {        /* list_option info */
 193                         int nr;
 194                         const struct ixgb_opt_list {
 195                                 int i;
 196                                 const char *str;
 197                         } *p;
 198                 } l;
 199         } arg;
 200 };
 201
 202 static int __devinit
 203 ixgb_validate_option(unsigned int *value, const struct ixgb_option *opt)
 204 {
 205         if (*value == OPTION_UNSET) {
 206                 *value = opt->def;
 207                 return 0;
 208         }
 209
 210         switch (opt->type) {
 211         case enable_option:
 212                 switch (*value) {
 213                 case OPTION_ENABLED:
 214                         pr_info("%s Enabled\n", opt->name);
 215                         return 0;
 216                 case OPTION_DISABLED:
 217                         pr_info("%s Disabled\n", opt->name);
 218                         return 0;
 219                 }
 220                 break;
 221         case range_option:
 222                 if (*value >= opt->arg.r.min && *value <= opt->arg.r.max) {
 223                         pr_info("%s set to %i\n", opt->name, *value);
 224                         return 0;
 225                 }
 226                 break;
 227         case list_option: {
 228                 int i;
 229                 const struct ixgb_opt_list *ent;
 230
 231                 for (i = 0; i < opt->arg.l.nr; i++) {
 232                         ent = &opt->arg.l.p[i];
 233                         if (*value == ent->i) {
 234                                 if (ent->str[0] != '\0')
 235                                         pr_info("%s\n", ent->str);
 236                                 return 0;
 237                         }
 238                 }
 239         }
 240                 break;
 241         default:
 242                 BUG();
 243         }
 244
 245         pr_info("Invalid %s specified (%i) %s\n", opt->name, *value, opt->err);
 246         *value = opt->def;
 247         return -1;
 248 }
 249
 250 /**
 251  * ixgb_check_options - Range Checking for Command Line Parameters
 252  * @adapter: board private structure
 253  *
 254  * This routine checks all command line parameters for valid user
 255  * input.  If an invalid value is given, or if no user specified
 256  * value exists, a default value is used.  The final value is stored
 257  * in a variable in the adapter structure.
 258  **/
 259
 260 void __devinit
 261 ixgb_check_options(struct ixgb_adapter *adapter)
 262 {
 263         int bd = adapter->bd_number;
 264         if (bd >= IXGB_MAX_NIC) {
 265                 pr_notice("Warning: no configuration for board #%i\n", bd);
 266                 pr_notice("Using defaults for all values\n");
 267         }
 268
 269         { /* Transmit Descriptor Count */
 270                 const struct ixgb_option opt = {
 271                         .type = range_option,
 272                         .name = "Transmit Descriptors",
 273                         .err  = "using default of " __MODULE_STRING(DEFAULT_TXD),
 274                         .def  = DEFAULT_TXD,
 275                         .arg  = { .r = { .min = MIN_TXD,
 276                                          .max = MAX_TXD}}
 277                 };
 278                 struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 279
 280                 if (num_TxDescriptors > bd) {
 281                         tx_ring->count = TxDescriptors[bd];
 282                         ixgb_validate_option(&tx_ring->count, &opt);
 283                 } else {
 284                         tx_ring->count = opt.def;
 285                 }
 286                 tx_ring->count = ALIGN(tx_ring->count, IXGB_REQ_TX_DESCRIPTOR_MULTIPLE);
 287         }
 288         { /* Receive Descriptor Count */
 289                 const struct ixgb_option opt = {
 290                         .type = range_option,
 291                         .name = "Receive Descriptors",
 292                         .err  = "using default of " __MODULE_STRING(DEFAULT_RXD),
 293                         .def  = DEFAULT_RXD,
 294                         .arg  = { .r = { .min = MIN_RXD,
 295                                          .max = MAX_RXD}}
 296                 };
 297                 struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 298
 299                 if (num_RxDescriptors > bd) {
 300                         rx_ring->count = RxDescriptors[bd];
 301                         ixgb_validate_option(&rx_ring->count, &opt);
 302                 } else {
 303                         rx_ring->count = opt.def;
 304                 }
 305                 rx_ring->count = ALIGN(rx_ring->count, IXGB_REQ_RX_DESCRIPTOR_MULTIPLE);
 306         }
 307         { /* Receive Checksum Offload Enable */
 308                 const struct ixgb_option opt = {
 309                         .type = enable_option,
 310                         .name = "Receive Checksum Offload",
 311                         .err  = "defaulting to Enabled",
 312                         .def  = OPTION_ENABLED
 313                 };
 314
 315                 if (num_XsumRX > bd) {
 316                         unsigned int rx_csum = XsumRX[bd];
 317                         ixgb_validate_option(&rx_csum, &opt);
 318                         adapter->rx_csum = rx_csum;
 319                 } else {
 320                         adapter->rx_csum = opt.def;
 321                 }
 322         }
 323         { /* Flow Control */
 324
 325                 static const struct ixgb_opt_list fc_list[] = {
 326                        { ixgb_fc_none, "Flow Control Disabled" },
 327                        { ixgb_fc_rx_pause, "Flow Control Receive Only" },
 328                        { ixgb_fc_tx_pause, "Flow Control Transmit Only" },
 329                        { ixgb_fc_full, "Flow Control Enabled" },
 330                        { ixgb_fc_default, "Flow Control Hardware Default" }
 331                 };
 332
 333                 static const struct ixgb_option opt = {
 334                         .type = list_option,
 335                         .name = "Flow Control",
 336                         .err  = "reading default settings from EEPROM",
 337                         .def  = ixgb_fc_tx_pause,
 338                         .arg  = { .l = { .nr = ARRAY_SIZE(fc_list),
 339                                          .p = fc_list }}
 340                 };
 341
 342                 if (num_FlowControl > bd) {
 343                         unsigned int fc = FlowControl[bd];
 344                         ixgb_validate_option(&fc, &opt);
 345                         adapter->hw.fc.type = fc;
 346                 } else {
 347                         adapter->hw.fc.type = opt.def;
 348                 }
 349         }
 350         { /* Receive Flow Control High Threshold */
 351                 const struct ixgb_option opt = {
 352                         .type = range_option,
 353                         .name = "Rx Flow Control High Threshold",
 354                         .err  = "using default of " __MODULE_STRING(DEFAULT_FCRTH),
 355                         .def  = DEFAULT_FCRTH,
 356                         .arg  = { .r = { .min = MIN_FCRTH,
 357                                          .max = MAX_FCRTH}}
 358                 };
 359
 360                 if (num_RxFCHighThresh > bd) {
 361                         adapter->hw.fc.high_water = RxFCHighThresh[bd];
 362                         ixgb_validate_option(&adapter->hw.fc.high_water, &opt);
 363                 } else {
 364                         adapter->hw.fc.high_water = opt.def;
 365                 }
 366                 if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
 367                         pr_info("Ignoring RxFCHighThresh when no RxFC\n");
 368         }
 369         { /* Receive Flow Control Low Threshold */
 370                 const struct ixgb_option opt = {
 371                         .type = range_option,
 372                         .name = "Rx Flow Control Low Threshold",
 373                         .err  = "using default of " __MODULE_STRING(DEFAULT_FCRTL),
 374                         .def  = DEFAULT_FCRTL,
 375                         .arg  = { .r = { .min = MIN_FCRTL,
 376                                          .max = MAX_FCRTL}}
 377                 };
 378
 379                 if (num_RxFCLowThresh > bd) {
 380                         adapter->hw.fc.low_water = RxFCLowThresh[bd];
 381                         ixgb_validate_option(&adapter->hw.fc.low_water, &opt);
 382                 } else {
 383                         adapter->hw.fc.low_water = opt.def;
 384                 }
 385                 if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
 386                         pr_info("Ignoring RxFCLowThresh when no RxFC\n");
 387         }
 388         { /* Flow Control Pause Time Request*/
 389                 const struct ixgb_option opt = {
 390                         .type = range_option,
 391                         .name = "Flow Control Pause Time Request",
 392                         .err  = "using default of "__MODULE_STRING(DEFAULT_FCPAUSE),
 393                         .def  = DEFAULT_FCPAUSE,
 394                         .arg = { .r = { .min = MIN_FCPAUSE,
 395                                         .max = MAX_FCPAUSE}}
 396                 };
 397
 398                 if (num_FCReqTimeout > bd) {
 399                         unsigned int pause_time = FCReqTimeout[bd];
 400                         ixgb_validate_option(&pause_time, &opt);
 401                         adapter->hw.fc.pause_time = pause_time;
 402                 } else {
 403                         adapter->hw.fc.pause_time = opt.def;
 404                 }
 405                 if (!(adapter->hw.fc.type & ixgb_fc_tx_pause) )
 406                         pr_info("Ignoring FCReqTimeout when no RxFC\n");
 407         }
 408         /* high low and spacing check for rx flow control thresholds */
 409         if (adapter->hw.fc.type & ixgb_fc_tx_pause) {
 410                 /* high must be greater than low */
 411                 if (adapter->hw.fc.high_water < (adapter->hw.fc.low_water + 8)) {
 412                         /* set defaults */
 413                         pr_info("RxFCHighThresh must be >= (RxFCLowThresh + 8), Using Defaults\n");
 414                         adapter->hw.fc.high_water = DEFAULT_FCRTH;
 415                         adapter->hw.fc.low_water  = DEFAULT_FCRTL;
 416                 }
 417         }
 418         { /* Receive Interrupt Delay */
 419                 const struct ixgb_option opt = {
 420                         .type = range_option,
 421                         .name = "Receive Interrupt Delay",
 422                         .err  = "using default of " __MODULE_STRING(DEFAULT_RDTR),
 423                         .def  = DEFAULT_RDTR,
 424                         .arg  = { .r = { .min = MIN_RDTR,
 425                                          .max = MAX_RDTR}}
 426                 };
 427
 428                 if (num_RxIntDelay > bd) {
 429                         adapter->rx_int_delay = RxIntDelay[bd];
 430                         ixgb_validate_option(&adapter->rx_int_delay, &opt);
 431                 } else {
 432                         adapter->rx_int_delay = opt.def;
 433                 }
 434         }
 435         { /* Transmit Interrupt Delay */
 436                 const struct ixgb_option opt = {
 437                         .type = range_option,
 438                         .name = "Transmit Interrupt Delay",
 439                         .err  = "using default of " __MODULE_STRING(DEFAULT_TIDV),
 440                         .def  = DEFAULT_TIDV,
 441                         .arg  = { .r = { .min = MIN_TIDV,
 442                                          .max = MAX_TIDV}}
 443                 };
 444
 445                 if (num_TxIntDelay > bd) {
 446                         adapter->tx_int_delay = TxIntDelay[bd];
 447                         ixgb_validate_option(&adapter->tx_int_delay, &opt);
 448                 } else {
 449                         adapter->tx_int_delay = opt.def;
 450                 }
 451         }
 452
 453         { /* Transmit Interrupt Delay Enable */
 454                 const struct ixgb_option opt = {
 455                         .type = enable_option,
 456                         .name = "Tx Interrupt Delay Enable",
 457                         .err  = "defaulting to Enabled",
 458                         .def  = OPTION_ENABLED
 459                 };
 460
 461                 if (num_IntDelayEnable > bd) {
 462                         unsigned int ide = IntDelayEnable[bd];
 463                         ixgb_validate_option(&ide, &opt);
 464                         adapter->tx_int_delay_enable = ide;
 465                 } else {
 466                         adapter->tx_int_delay_enable = opt.def;
 467                 }
 468         }
 469 }