drivers/net/ethernet/intel/e1000e/param.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 1999 - 2018 Intel Corporation. */
   3
   4 #include <linux/netdevice.h>
   5 #include <linux/module.h>
   6 #include <linux/pci.h>
   7
   8 #include "e1000.h"
   9
  10 /* This is the only thing that needs to be changed to adjust the
  11  * maximum number of ports that the driver can manage.
  12  */
  13 #define E1000_MAX_NIC 32
  14
  15 #define OPTION_UNSET   -1
  16 #define OPTION_DISABLED 0
  17 #define OPTION_ENABLED  1
  18
  19 #define COPYBREAK_DEFAULT 256
  20 unsigned int copybreak = COPYBREAK_DEFAULT;
  21 module_param(copybreak, uint, 0644);
  22 MODULE_PARM_DESC(copybreak,
  23                  "Maximum size of packet that is copied to a new buffer on receive");
  24
  25 /* All parameters are treated the same, as an integer array of values.
  26  * This macro just reduces the need to repeat the same declaration code
  27  * over and over (plus this helps to avoid typo bugs).
  28  */
  29 #define E1000_PARAM_INIT { [0 ... E1000_MAX_NIC] = OPTION_UNSET }
  30 #define E1000_PARAM(X, desc)                                    \
  31         static int X[E1000_MAX_NIC+1] = E1000_PARAM_INIT;       \
  32         static unsigned int num_##X;                            \
  33         module_param_array_named(X, X, int, &num_##X, 0);       \
  34         MODULE_PARM_DESC(X, desc);
  35
  36 /* Transmit Interrupt Delay in units of 1.024 microseconds
  37  * Tx interrupt delay needs to typically be set to something non-zero
  38  *
  39  * Valid Range: 0-65535
  40  */
  41 E1000_PARAM(TxIntDelay, "Transmit Interrupt Delay");
  42 #define DEFAULT_TIDV 8
  43 #define MAX_TXDELAY 0xFFFF
  44 #define MIN_TXDELAY 0
  45
  46 /* Transmit Absolute Interrupt Delay in units of 1.024 microseconds
  47  *
  48  * Valid Range: 0-65535
  49  */
  50 E1000_PARAM(TxAbsIntDelay, "Transmit Absolute Interrupt Delay");
  51 #define DEFAULT_TADV 32
  52 #define MAX_TXABSDELAY 0xFFFF
  53 #define MIN_TXABSDELAY 0
  54
  55 /* Receive Interrupt Delay in units of 1.024 microseconds
  56  * hardware will likely hang if you set this to anything but zero.
  57  *
  58  * Burst variant is used as default if device has FLAG2_DMA_BURST.
  59  *
  60  * Valid Range: 0-65535
  61  */
  62 E1000_PARAM(RxIntDelay, "Receive Interrupt Delay");
  63 #define DEFAULT_RDTR    0
  64 #define BURST_RDTR      0x20
  65 #define MAX_RXDELAY 0xFFFF
  66 #define MIN_RXDELAY 0
  67
  68 /* Receive Absolute Interrupt Delay in units of 1.024 microseconds
  69  *
  70  * Burst variant is used as default if device has FLAG2_DMA_BURST.
  71  *
  72  * Valid Range: 0-65535
  73  */
  74 E1000_PARAM(RxAbsIntDelay, "Receive Absolute Interrupt Delay");
  75 #define DEFAULT_RADV    8
  76 #define BURST_RADV      0x20
  77 #define MAX_RXABSDELAY 0xFFFF
  78 #define MIN_RXABSDELAY 0
  79
  80 /* Interrupt Throttle Rate (interrupts/sec)
  81  *
  82  * Valid Range: 100-100000 or one of: 0=off, 1=dynamic, 3=dynamic conservative
  83  */
  84 E1000_PARAM(InterruptThrottleRate, "Interrupt Throttling Rate");
  85 #define DEFAULT_ITR 3
  86 #define MAX_ITR 100000
  87 #define MIN_ITR 100
  88
  89 /* IntMode (Interrupt Mode)
  90  *
  91  * Valid Range: varies depending on kernel configuration & hardware support
  92  *
  93  * legacy=0, MSI=1, MSI-X=2
  94  *
  95  * When MSI/MSI-X support is enabled in kernel-
  96  *   Default Value: 2 (MSI-X) when supported by hardware, 1 (MSI) otherwise
  97  * When MSI/MSI-X support is not enabled in kernel-
  98  *   Default Value: 0 (legacy)
  99  *
 100  * When a mode is specified that is not allowed/supported, it will be
 101  * demoted to the most advanced interrupt mode available.
 102  */
 103 E1000_PARAM(IntMode, "Interrupt Mode");
 104
 105 /* Enable Smart Power Down of the PHY
 106  *
 107  * Valid Range: 0, 1
 108  *
 109  * Default Value: 0 (disabled)
 110  */
 111 E1000_PARAM(SmartPowerDownEnable, "Enable PHY smart power down");
 112
 113 /* Enable Kumeran Lock Loss workaround
 114  *
 115  * Valid Range: 0, 1
 116  *
 117  * Default Value: 1 (enabled)
 118  */
 119 E1000_PARAM(KumeranLockLoss, "Enable Kumeran lock loss workaround");
 120
 121 /* Write Protect NVM
 122  *
 123  * Valid Range: 0, 1
 124  *
 125  * Default Value: 1 (enabled)
 126  */
 127 E1000_PARAM(WriteProtectNVM,
 128             "Write-protect NVM [WARNING: disabling this can lead to corrupted NVM]");
 129
 130 /* Enable CRC Stripping
 131  *
 132  * Valid Range: 0, 1
 133  *
 134  * Default Value: 1 (enabled)
 135  */
 136 E1000_PARAM(CrcStripping,
 137             "Enable CRC Stripping, disable if your BMC needs the CRC");
 138
 139 struct e1000_option {
 140         enum { enable_option, range_option, list_option } type;
 141         const char *name;
 142         const char *err;
 143         int def;
 144         union {
 145                 /* range_option info */
 146                 struct {
 147                         int min;
 148                         int max;
 149                 } r;
 150                 /* list_option info */
 151                 struct {
 152                         int nr;
 153                         struct e1000_opt_list {
 154                                 int i;
 155                                 char *str;
 156                         } *p;
 157                 } l;
 158         } arg;
 159 };
 160
 161 static int e1000_validate_option(unsigned int *value,
 162                                  const struct e1000_option *opt,
 163                                  struct e1000_adapter *adapter)
 164 {
 165         if (*value == OPTION_UNSET) {
 166                 *value = opt->def;
 167                 return 0;
 168         }
 169
 170         switch (opt->type) {
 171         case enable_option:
 172                 switch (*value) {
 173                 case OPTION_ENABLED:
 174                         dev_info(&adapter->pdev->dev, "%s Enabled\n",
 175                                  opt->name);
 176                         return 0;
 177                 case OPTION_DISABLED:
 178                         dev_info(&adapter->pdev->dev, "%s Disabled\n",
 179                                  opt->name);
 180                         return 0;
 181                 }
 182                 break;
 183         case range_option:
 184                 if (*value >= opt->arg.r.min && *value <= opt->arg.r.max) {
 185                         dev_info(&adapter->pdev->dev, "%s set to %i\n",
 186                                  opt->name, *value);
 187                         return 0;
 188                 }
 189                 break;
 190         case list_option: {
 191                 int i;
 192                 struct e1000_opt_list *ent;
 193
 194                 for (i = 0; i < opt->arg.l.nr; i++) {
 195                         ent = &opt->arg.l.p[i];
 196                         if (*value == ent->i) {
 197                                 if (ent->str[0] != '\0')
 198                                         dev_info(&adapter->pdev->dev, "%s\n",
 199                                                  ent->str);
 200                                 return 0;
 201                         }
 202                 }
 203         }
 204                 break;
 205         default:
 206                 BUG();
 207         }
 208
 209         dev_info(&adapter->pdev->dev, "Invalid %s value specified (%i) %s\n",
 210                  opt->name, *value, opt->err);
 211         *value = opt->def;
 212         return -1;
 213 }
 214
 215 /**
 216  * e1000e_check_options - Range Checking for Command Line Parameters
 217  * @adapter: board private structure
 218  *
 219  * This routine checks all command line parameters for valid user
 220  * input.  If an invalid value is given, or if no user specified
 221  * value exists, a default value is used.  The final value is stored
 222  * in a variable in the adapter structure.
 223  **/
 224 void e1000e_check_options(struct e1000_adapter *adapter)
 225 {
 226         struct e1000_hw *hw = &adapter->hw;
 227         int bd = adapter->bd_number;
 228
 229         if (bd >= E1000_MAX_NIC) {
 230                 dev_notice(&adapter->pdev->dev,
 231                            "Warning: no configuration for board #%i\n", bd);
 232                 dev_notice(&adapter->pdev->dev,
 233                            "Using defaults for all values\n");
 234         }
 235
 236         /* Transmit Interrupt Delay */
 237         {
 238                 static const struct e1000_option opt = {
 239                         .type = range_option,
 240                         .name = "Transmit Interrupt Delay",
 241                         .err  = "using default of "
 242                                 __MODULE_STRING(DEFAULT_TIDV),
 243                         .def  = DEFAULT_TIDV,
 244                         .arg  = { .r = { .min = MIN_TXDELAY,
 245                                          .max = MAX_TXDELAY } }
 246                 };
 247
 248                 if (num_TxIntDelay > bd) {
 249                         adapter->tx_int_delay = TxIntDelay[bd];
 250                         e1000_validate_option(&adapter->tx_int_delay, &opt,
 251                                               adapter);
 252                 } else {
 253                         adapter->tx_int_delay = opt.def;
 254                 }
 255         }
 256         /* Transmit Absolute Interrupt Delay */
 257         {
 258                 static const struct e1000_option opt = {
 259                         .type = range_option,
 260                         .name = "Transmit Absolute Interrupt Delay",
 261                         .err  = "using default of "
 262                                 __MODULE_STRING(DEFAULT_TADV),
 263                         .def  = DEFAULT_TADV,
 264                         .arg  = { .r = { .min = MIN_TXABSDELAY,
 265                                          .max = MAX_TXABSDELAY } }
 266                 };
 267
 268                 if (num_TxAbsIntDelay > bd) {
 269                         adapter->tx_abs_int_delay = TxAbsIntDelay[bd];
 270                         e1000_validate_option(&adapter->tx_abs_int_delay, &opt,
 271                                               adapter);
 272                 } else {
 273                         adapter->tx_abs_int_delay = opt.def;
 274                 }
 275         }
 276         /* Receive Interrupt Delay */
 277         {
 278                 static struct e1000_option opt = {
 279                         .type = range_option,
 280                         .name = "Receive Interrupt Delay",
 281                         .err  = "using default of "
 282                                 __MODULE_STRING(DEFAULT_RDTR),
 283                         .def  = DEFAULT_RDTR,
 284                         .arg  = { .r = { .min = MIN_RXDELAY,
 285                                          .max = MAX_RXDELAY } }
 286                 };
 287
 288                 if (adapter->flags2 & FLAG2_DMA_BURST)
 289                         opt.def = BURST_RDTR;
 290
 291                 if (num_RxIntDelay > bd) {
 292                         adapter->rx_int_delay = RxIntDelay[bd];
 293                         e1000_validate_option(&adapter->rx_int_delay, &opt,
 294                                               adapter);
 295                 } else {
 296                         adapter->rx_int_delay = opt.def;
 297                 }
 298         }
 299         /* Receive Absolute Interrupt Delay */
 300         {
 301                 static struct e1000_option opt = {
 302                         .type = range_option,
 303                         .name = "Receive Absolute Interrupt Delay",
 304                         .err  = "using default of "
 305                                 __MODULE_STRING(DEFAULT_RADV),
 306                         .def  = DEFAULT_RADV,
 307                         .arg  = { .r = { .min = MIN_RXABSDELAY,
 308                                          .max = MAX_RXABSDELAY } }
 309                 };
 310
 311                 if (adapter->flags2 & FLAG2_DMA_BURST)
 312                         opt.def = BURST_RADV;
 313
 314                 if (num_RxAbsIntDelay > bd) {
 315                         adapter->rx_abs_int_delay = RxAbsIntDelay[bd];
 316                         e1000_validate_option(&adapter->rx_abs_int_delay, &opt,
 317                                               adapter);
 318                 } else {
 319                         adapter->rx_abs_int_delay = opt.def;
 320                 }
 321         }
 322         /* Interrupt Throttling Rate */
 323         {
 324                 static const struct e1000_option opt = {
 325                         .type = range_option,
 326                         .name = "Interrupt Throttling Rate (ints/sec)",
 327                         .err  = "using default of "
 328                                 __MODULE_STRING(DEFAULT_ITR),
 329                         .def  = DEFAULT_ITR,
 330                         .arg  = { .r = { .min = MIN_ITR,
 331                                          .max = MAX_ITR } }
 332                 };
 333
 334                 if (num_InterruptThrottleRate > bd) {
 335                         adapter->itr = InterruptThrottleRate[bd];
 336
 337                         /* Make sure a message is printed for non-special
 338                          * values. And in case of an invalid option, display
 339                          * warning, use default and go through itr/itr_setting
 340                          * adjustment logic below
 341                          */
 342                         if ((adapter->itr > 4) &&
 343                             e1000_validate_option(&adapter->itr, &opt, adapter))
 344                                 adapter->itr = opt.def;
 345                 } else {
 346                         /* If no option specified, use default value and go
 347                          * through the logic below to adjust itr/itr_setting
 348                          */
 349                         adapter->itr = opt.def;
 350
 351                         /* Make sure a message is printed for non-special
 352                          * default values
 353                          */
 354                         if (adapter->itr > 4)
 355                                 dev_info(&adapter->pdev->dev,
 356                                          "%s set to default %d\n", opt.name,
 357                                          adapter->itr);
 358                 }
 359
 360                 adapter->itr_setting = adapter->itr;
 361                 switch (adapter->itr) {
 362                 case 0:
 363                         dev_info(&adapter->pdev->dev, "%s turned off\n",
 364                                  opt.name);
 365                         break;
 366                 case 1:
 367                         dev_info(&adapter->pdev->dev,
 368                                  "%s set to dynamic mode\n", opt.name);
 369                         adapter->itr = 20000;
 370                         break;
 371                 case 2:
 372                         dev_info(&adapter->pdev->dev,
 373                                  "%s Invalid mode - setting default\n",
 374                                  opt.name);
 375                         adapter->itr_setting = opt.def;
 376                         fallthrough;
 377                 case 3:
 378                         dev_info(&adapter->pdev->dev,
 379                                  "%s set to dynamic conservative mode\n",
 380                                  opt.name);
 381                         adapter->itr = 20000;
 382                         break;
 383                 case 4:
 384                         dev_info(&adapter->pdev->dev,
 385                                  "%s set to simplified (2000-8000 ints) mode\n",
 386                                  opt.name);
 387                         break;
 388                 default:
 389                         /* Save the setting, because the dynamic bits
 390                          * change itr.
 391                          *
 392                          * Clear the lower two bits because
 393                          * they are used as control.
 394                          */
 395                         adapter->itr_setting &= ~3;
 396                         break;
 397                 }
 398         }
 399         /* Interrupt Mode */
 400         {
 401                 static struct e1000_option opt = {
 402                         .type = range_option,
 403                         .name = "Interrupt Mode",
 404 #ifndef CONFIG_PCI_MSI
 405                         .err  = "defaulting to 0 (legacy)",
 406                         .def  = E1000E_INT_MODE_LEGACY,
 407                         .arg  = { .r = { .min = 0,
 408                                          .max = 0 } }
 409 #endif
 410                 };
 411
 412 #ifdef CONFIG_PCI_MSI
 413                 if (adapter->flags & FLAG_HAS_MSIX) {
 414                         opt.err = kstrdup("defaulting to 2 (MSI-X)",
 415                                           GFP_KERNEL);
 416                         opt.def = E1000E_INT_MODE_MSIX;
 417                         opt.arg.r.max = E1000E_INT_MODE_MSIX;
 418                 } else {
 419                         opt.err = kstrdup("defaulting to 1 (MSI)", GFP_KERNEL);
 420                         opt.def = E1000E_INT_MODE_MSI;
 421                         opt.arg.r.max = E1000E_INT_MODE_MSI;
 422                 }
 423
 424                 if (!opt.err) {
 425                         dev_err(&adapter->pdev->dev,
 426                                 "Failed to allocate memory\n");
 427                         return;
 428                 }
 429 #endif
 430
 431                 if (num_IntMode > bd) {
 432                         unsigned int int_mode = IntMode[bd];
 433
 434                         e1000_validate_option(&int_mode, &opt, adapter);
 435                         adapter->int_mode = int_mode;
 436                 } else {
 437                         adapter->int_mode = opt.def;
 438                 }
 439
 440 #ifdef CONFIG_PCI_MSI
 441                 kfree(opt.err);
 442 #endif
 443         }
 444         /* Smart Power Down */
 445         {
 446                 static const struct e1000_option opt = {
 447                         .type = enable_option,
 448                         .name = "PHY Smart Power Down",
 449                         .err  = "defaulting to Disabled",
 450                         .def  = OPTION_DISABLED
 451                 };
 452
 453                 if (num_SmartPowerDownEnable > bd) {
 454                         unsigned int spd = SmartPowerDownEnable[bd];
 455
 456                         e1000_validate_option(&spd, &opt, adapter);
 457                         if ((adapter->flags & FLAG_HAS_SMART_POWER_DOWN) && spd)
 458                                 adapter->flags |= FLAG_SMART_POWER_DOWN;
 459                 }
 460         }
 461         /* CRC Stripping */
 462         {
 463                 static const struct e1000_option opt = {
 464                         .type = enable_option,
 465                         .name = "CRC Stripping",
 466                         .err  = "defaulting to Enabled",
 467                         .def  = OPTION_ENABLED
 468                 };
 469
 470                 if (num_CrcStripping > bd) {
 471                         unsigned int crc_stripping = CrcStripping[bd];
 472
 473                         e1000_validate_option(&crc_stripping, &opt, adapter);
 474                         if (crc_stripping == OPTION_ENABLED) {
 475                                 adapter->flags2 |= FLAG2_CRC_STRIPPING;
 476                                 adapter->flags2 |= FLAG2_DFLT_CRC_STRIPPING;
 477                         }
 478                 } else {
 479                         adapter->flags2 |= FLAG2_CRC_STRIPPING;
 480                         adapter->flags2 |= FLAG2_DFLT_CRC_STRIPPING;
 481                 }
 482         }
 483         /* Kumeran Lock Loss Workaround */
 484         {
 485                 static const struct e1000_option opt = {
 486                         .type = enable_option,
 487                         .name = "Kumeran Lock Loss Workaround",
 488                         .err  = "defaulting to Enabled",
 489                         .def  = OPTION_ENABLED
 490                 };
 491                 bool enabled = opt.def;
 492
 493                 if (num_KumeranLockLoss > bd) {
 494                         unsigned int kmrn_lock_loss = KumeranLockLoss[bd];
 495
 496                         e1000_validate_option(&kmrn_lock_loss, &opt, adapter);
 497                         enabled = kmrn_lock_loss;
 498                 }
 499
 500                 if (hw->mac.type == e1000_ich8lan)
 501                         e1000e_set_kmrn_lock_loss_workaround_ich8lan(hw,
 502                                                                      enabled);
 503         }
 504         /* Write-protect NVM */
 505         {
 506                 static const struct e1000_option opt = {
 507                         .type = enable_option,
 508                         .name = "Write-protect NVM",
 509                         .err  = "defaulting to Enabled",
 510                         .def  = OPTION_ENABLED
 511                 };
 512
 513                 if (adapter->flags & FLAG_IS_ICH) {
 514                         if (num_WriteProtectNVM > bd) {
 515                                 unsigned int write_protect_nvm =
 516                                     WriteProtectNVM[bd];
 517                                 e1000_validate_option(&write_protect_nvm, &opt,
 518                                                       adapter);
 519                                 if (write_protect_nvm)
 520                                         adapter->flags |= FLAG_READ_ONLY_NVM;
 521                         } else {
 522                                 if (opt.def)
 523                                         adapter->flags |= FLAG_READ_ONLY_NVM;
 524                         }
 525                 }
 526         }
 527 }