1 /**************************************************************************** 2 * Driver for Solarflare network controllers and boards 3 * Copyright 2005-2006 Fen Systems Ltd. 4 * Copyright 2006-2013 Solarflare Communications Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published 8 * by the Free Software Foundation, incorporated herein by reference. 9 */ 10 11 #include <linux/bitops.h> 12 #include <linux/delay.h> 13 #include <linux/interrupt.h> 14 #include <linux/pci.h> 15 #include <linux/module.h> 16 #include <linux/seq_file.h> 17 #include <linux/cpu_rmap.h> 18 #include "net_driver.h" 19 #include "bitfield.h" 20 #include "efx.h" 21 #include "nic.h" 22 #include "ef10_regs.h" 23 #include "farch_regs.h" 24 #include "io.h" 25 #include "workarounds.h" 26 27 /************************************************************************** 28 * 29 * Generic buffer handling 30 * These buffers are used for interrupt status, MAC stats, etc. 31 * 32 **************************************************************************/ 33 34 int efx_nic_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer, 35 unsigned int len, gfp_t gfp_flags) 36 { 37 buffer->addr = dma_zalloc_coherent(&efx->pci_dev->dev, len, 38 &buffer->dma_addr, gfp_flags); 39 if (!buffer->addr) 40 return -ENOMEM; 41 buffer->len = len; 42 return 0; 43 } 44 45 void efx_nic_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer) 46 { 47 if (buffer->addr) { 48 dma_free_coherent(&efx->pci_dev->dev, buffer->len, 49 buffer->addr, buffer->dma_addr); 50 buffer->addr = NULL; 51 } 52 } 53 54 /* Check whether an event is present in the eventq at the current 55 * read pointer. Only useful for self-test. 56 */ 57 bool efx_nic_event_present(struct efx_channel *channel) 58 { 59 return efx_event_present(efx_event(channel, channel->eventq_read_ptr)); 60 } 61 62 void efx_nic_event_test_start(struct efx_channel *channel) 63 { 64 channel->event_test_cpu = -1; 65 smp_wmb(); 66 channel->efx->type->ev_test_generate(channel); 67 } 68 69 void efx_nic_irq_test_start(struct efx_nic *efx) 70 { 71 efx->last_irq_cpu = -1; 72 smp_wmb(); 73 efx->type->irq_test_generate(efx); 74 } 75 76 /* Hook interrupt handler(s) 77 * Try MSI and then legacy interrupts. 78 */ 79 int efx_nic_init_interrupt(struct efx_nic *efx) 80 { 81 struct efx_channel *channel; 82 unsigned int n_irqs; 83 int rc; 84 85 if (!EFX_INT_MODE_USE_MSI(efx)) { 86 rc = request_irq(efx->legacy_irq, 87 efx->type->irq_handle_legacy, IRQF_SHARED, 88 efx->name, efx); 89 if (rc) { 90 netif_err(efx, drv, efx->net_dev, 91 "failed to hook legacy IRQ %d\n", 92 efx->pci_dev->irq); 93 goto fail1; 94 } 95 return 0; 96 } 97 98 #ifdef CONFIG_RFS_ACCEL 99 if (efx->interrupt_mode == EFX_INT_MODE_MSIX) { 100 efx->net_dev->rx_cpu_rmap = 101 alloc_irq_cpu_rmap(efx->n_rx_channels); 102 if (!efx->net_dev->rx_cpu_rmap) { 103 rc = -ENOMEM; 104 goto fail1; 105 } 106 } 107 #endif 108 109 /* Hook MSI or MSI-X interrupt */ 110 n_irqs = 0; 111 efx_for_each_channel(channel, efx) { 112 rc = request_irq(channel->irq, efx->type->irq_handle_msi, 113 IRQF_PROBE_SHARED, /* Not shared */ 114 efx->msi_context[channel->channel].name, 115 &efx->msi_context[channel->channel]); 116 if (rc) { 117 netif_err(efx, drv, efx->net_dev, 118 "failed to hook IRQ %d\n", channel->irq); 119 goto fail2; 120 } 121 ++n_irqs; 122 123 #ifdef CONFIG_RFS_ACCEL 124 if (efx->interrupt_mode == EFX_INT_MODE_MSIX && 125 channel->channel < efx->n_rx_channels) { 126 rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap, 127 channel->irq); 128 if (rc) 129 goto fail2; 130 } 131 #endif 132 } 133 134 return 0; 135 136 fail2: 137 #ifdef CONFIG_RFS_ACCEL 138 free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap); 139 efx->net_dev->rx_cpu_rmap = NULL; 140 #endif 141 efx_for_each_channel(channel, efx) { 142 if (n_irqs-- == 0) 143 break; 144 free_irq(channel->irq, &efx->msi_context[channel->channel]); 145 } 146 fail1: 147 return rc; 148 } 149 150 void efx_nic_fini_interrupt(struct efx_nic *efx) 151 { 152 struct efx_channel *channel; 153 154 #ifdef CONFIG_RFS_ACCEL 155 free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap); 156 efx->net_dev->rx_cpu_rmap = NULL; 157 #endif 158 159 /* Disable MSI/MSI-X interrupts */ 160 efx_for_each_channel(channel, efx) 161 free_irq(channel->irq, &efx->msi_context[channel->channel]); 162 163 /* Disable legacy interrupt */ 164 if (efx->legacy_irq) 165 free_irq(efx->legacy_irq, efx); 166 } 167 168 /* Register dump */ 169 170 #define REGISTER_REVISION_FA 1 171 #define REGISTER_REVISION_FB 2 172 #define REGISTER_REVISION_FC 3 173 #define REGISTER_REVISION_FZ 3 /* last Falcon arch revision */ 174 #define REGISTER_REVISION_ED 4 175 #define REGISTER_REVISION_EZ 4 /* latest EF10 revision */ 176 177 struct efx_nic_reg { 178 u32 offset:24; 179 u32 min_revision:3, max_revision:3; 180 }; 181 182 #define REGISTER(name, arch, min_rev, max_rev) { \ 183 arch ## R_ ## min_rev ## max_rev ## _ ## name, \ 184 REGISTER_REVISION_ ## arch ## min_rev, \ 185 REGISTER_REVISION_ ## arch ## max_rev \ 186 } 187 #define REGISTER_AA(name) REGISTER(name, F, A, A) 188 #define REGISTER_AB(name) REGISTER(name, F, A, B) 189 #define REGISTER_AZ(name) REGISTER(name, F, A, Z) 190 #define REGISTER_BB(name) REGISTER(name, F, B, B) 191 #define REGISTER_BZ(name) REGISTER(name, F, B, Z) 192 #define REGISTER_CZ(name) REGISTER(name, F, C, Z) 193 #define REGISTER_DZ(name) REGISTER(name, E, D, Z) 194 195 static const struct efx_nic_reg efx_nic_regs[] = { 196 REGISTER_AZ(ADR_REGION), 197 REGISTER_AZ(INT_EN_KER), 198 REGISTER_BZ(INT_EN_CHAR), 199 REGISTER_AZ(INT_ADR_KER), 200 REGISTER_BZ(INT_ADR_CHAR), 201 /* INT_ACK_KER is WO */ 202 /* INT_ISR0 is RC */ 203 REGISTER_AZ(HW_INIT), 204 REGISTER_CZ(USR_EV_CFG), 205 REGISTER_AB(EE_SPI_HCMD), 206 REGISTER_AB(EE_SPI_HADR), 207 REGISTER_AB(EE_SPI_HDATA), 208 REGISTER_AB(EE_BASE_PAGE), 209 REGISTER_AB(EE_VPD_CFG0), 210 /* EE_VPD_SW_CNTL and EE_VPD_SW_DATA are not used */ 211 /* PMBX_DBG_IADDR and PBMX_DBG_IDATA are indirect */ 212 /* PCIE_CORE_INDIRECT is indirect */ 213 REGISTER_AB(NIC_STAT), 214 REGISTER_AB(GPIO_CTL), 215 REGISTER_AB(GLB_CTL), 216 /* FATAL_INTR_KER and FATAL_INTR_CHAR are partly RC */ 217 REGISTER_BZ(DP_CTRL), 218 REGISTER_AZ(MEM_STAT), 219 REGISTER_AZ(CS_DEBUG), 220 REGISTER_AZ(ALTERA_BUILD), 221 REGISTER_AZ(CSR_SPARE), 222 REGISTER_AB(PCIE_SD_CTL0123), 223 REGISTER_AB(PCIE_SD_CTL45), 224 REGISTER_AB(PCIE_PCS_CTL_STAT), 225 /* DEBUG_DATA_OUT is not used */ 226 /* DRV_EV is WO */ 227 REGISTER_AZ(EVQ_CTL), 228 REGISTER_AZ(EVQ_CNT1), 229 REGISTER_AZ(EVQ_CNT2), 230 REGISTER_AZ(BUF_TBL_CFG), 231 REGISTER_AZ(SRM_RX_DC_CFG), 232 REGISTER_AZ(SRM_TX_DC_CFG), 233 REGISTER_AZ(SRM_CFG), 234 /* BUF_TBL_UPD is WO */ 235 REGISTER_AZ(SRM_UPD_EVQ), 236 REGISTER_AZ(SRAM_PARITY), 237 REGISTER_AZ(RX_CFG), 238 REGISTER_BZ(RX_FILTER_CTL), 239 /* RX_FLUSH_DESCQ is WO */ 240 REGISTER_AZ(RX_DC_CFG), 241 REGISTER_AZ(RX_DC_PF_WM), 242 REGISTER_BZ(RX_RSS_TKEY), 243 /* RX_NODESC_DROP is RC */ 244 REGISTER_AA(RX_SELF_RST), 245 /* RX_DEBUG, RX_PUSH_DROP are not used */ 246 REGISTER_CZ(RX_RSS_IPV6_REG1), 247 REGISTER_CZ(RX_RSS_IPV6_REG2), 248 REGISTER_CZ(RX_RSS_IPV6_REG3), 249 /* TX_FLUSH_DESCQ is WO */ 250 REGISTER_AZ(TX_DC_CFG), 251 REGISTER_AA(TX_CHKSM_CFG), 252 REGISTER_AZ(TX_CFG), 253 /* TX_PUSH_DROP is not used */ 254 REGISTER_AZ(TX_RESERVED), 255 REGISTER_BZ(TX_PACE), 256 /* TX_PACE_DROP_QID is RC */ 257 REGISTER_BB(TX_VLAN), 258 REGISTER_BZ(TX_IPFIL_PORTEN), 259 REGISTER_AB(MD_TXD), 260 REGISTER_AB(MD_RXD), 261 REGISTER_AB(MD_CS), 262 REGISTER_AB(MD_PHY_ADR), 263 REGISTER_AB(MD_ID), 264 /* MD_STAT is RC */ 265 REGISTER_AB(MAC_STAT_DMA), 266 REGISTER_AB(MAC_CTRL), 267 REGISTER_BB(GEN_MODE), 268 REGISTER_AB(MAC_MC_HASH_REG0), 269 REGISTER_AB(MAC_MC_HASH_REG1), 270 REGISTER_AB(GM_CFG1), 271 REGISTER_AB(GM_CFG2), 272 /* GM_IPG and GM_HD are not used */ 273 REGISTER_AB(GM_MAX_FLEN), 274 /* GM_TEST is not used */ 275 REGISTER_AB(GM_ADR1), 276 REGISTER_AB(GM_ADR2), 277 REGISTER_AB(GMF_CFG0), 278 REGISTER_AB(GMF_CFG1), 279 REGISTER_AB(GMF_CFG2), 280 REGISTER_AB(GMF_CFG3), 281 REGISTER_AB(GMF_CFG4), 282 REGISTER_AB(GMF_CFG5), 283 REGISTER_BB(TX_SRC_MAC_CTL), 284 REGISTER_AB(XM_ADR_LO), 285 REGISTER_AB(XM_ADR_HI), 286 REGISTER_AB(XM_GLB_CFG), 287 REGISTER_AB(XM_TX_CFG), 288 REGISTER_AB(XM_RX_CFG), 289 REGISTER_AB(XM_MGT_INT_MASK), 290 REGISTER_AB(XM_FC), 291 REGISTER_AB(XM_PAUSE_TIME), 292 REGISTER_AB(XM_TX_PARAM), 293 REGISTER_AB(XM_RX_PARAM), 294 /* XM_MGT_INT_MSK (note no 'A') is RC */ 295 REGISTER_AB(XX_PWR_RST), 296 REGISTER_AB(XX_SD_CTL), 297 REGISTER_AB(XX_TXDRV_CTL), 298 /* XX_PRBS_CTL, XX_PRBS_CHK and XX_PRBS_ERR are not used */ 299 /* XX_CORE_STAT is partly RC */ 300 REGISTER_DZ(BIU_HW_REV_ID), 301 REGISTER_DZ(MC_DB_LWRD), 302 REGISTER_DZ(MC_DB_HWRD), 303 }; 304 305 struct efx_nic_reg_table { 306 u32 offset:24; 307 u32 min_revision:3, max_revision:3; 308 u32 step:6, rows:21; 309 }; 310 311 #define REGISTER_TABLE_DIMENSIONS(_, offset, arch, min_rev, max_rev, step, rows) { \ 312 offset, \ 313 REGISTER_REVISION_ ## arch ## min_rev, \ 314 REGISTER_REVISION_ ## arch ## max_rev, \ 315 step, rows \ 316 } 317 #define REGISTER_TABLE(name, arch, min_rev, max_rev) \ 318 REGISTER_TABLE_DIMENSIONS( \ 319 name, arch ## R_ ## min_rev ## max_rev ## _ ## name, \ 320 arch, min_rev, max_rev, \ 321 arch ## R_ ## min_rev ## max_rev ## _ ## name ## _STEP, \ 322 arch ## R_ ## min_rev ## max_rev ## _ ## name ## _ROWS) 323 #define REGISTER_TABLE_AA(name) REGISTER_TABLE(name, F, A, A) 324 #define REGISTER_TABLE_AZ(name) REGISTER_TABLE(name, F, A, Z) 325 #define REGISTER_TABLE_BB(name) REGISTER_TABLE(name, F, B, B) 326 #define REGISTER_TABLE_BZ(name) REGISTER_TABLE(name, F, B, Z) 327 #define REGISTER_TABLE_BB_CZ(name) \ 328 REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, B, B, \ 329 FR_BZ_ ## name ## _STEP, \ 330 FR_BB_ ## name ## _ROWS), \ 331 REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, C, Z, \ 332 FR_BZ_ ## name ## _STEP, \ 333 FR_CZ_ ## name ## _ROWS) 334 #define REGISTER_TABLE_CZ(name) REGISTER_TABLE(name, F, C, Z) 335 #define REGISTER_TABLE_DZ(name) REGISTER_TABLE(name, E, D, Z) 336 337 static const struct efx_nic_reg_table efx_nic_reg_tables[] = { 338 /* DRIVER is not used */ 339 /* EVQ_RPTR, TIMER_COMMAND, USR_EV and {RX,TX}_DESC_UPD are WO */ 340 REGISTER_TABLE_BB(TX_IPFIL_TBL), 341 REGISTER_TABLE_BB(TX_SRC_MAC_TBL), 342 REGISTER_TABLE_AA(RX_DESC_PTR_TBL_KER), 343 REGISTER_TABLE_BB_CZ(RX_DESC_PTR_TBL), 344 REGISTER_TABLE_AA(TX_DESC_PTR_TBL_KER), 345 REGISTER_TABLE_BB_CZ(TX_DESC_PTR_TBL), 346 REGISTER_TABLE_AA(EVQ_PTR_TBL_KER), 347 REGISTER_TABLE_BB_CZ(EVQ_PTR_TBL), 348 /* We can't reasonably read all of the buffer table (up to 8MB!). 349 * However this driver will only use a few entries. Reading 350 * 1K entries allows for some expansion of queue count and 351 * size before we need to change the version. */ 352 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL_KER, FR_AA_BUF_FULL_TBL_KER, 353 F, A, A, 8, 1024), 354 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL, FR_BZ_BUF_FULL_TBL, 355 F, B, Z, 8, 1024), 356 REGISTER_TABLE_CZ(RX_MAC_FILTER_TBL0), 357 REGISTER_TABLE_BB_CZ(TIMER_TBL), 358 REGISTER_TABLE_BB_CZ(TX_PACE_TBL), 359 REGISTER_TABLE_BZ(RX_INDIRECTION_TBL), 360 /* TX_FILTER_TBL0 is huge and not used by this driver */ 361 REGISTER_TABLE_CZ(TX_MAC_FILTER_TBL0), 362 REGISTER_TABLE_CZ(MC_TREG_SMEM), 363 /* MSIX_PBA_TABLE is not mapped */ 364 /* SRM_DBG is not mapped (and is redundant with BUF_FLL_TBL) */ 365 REGISTER_TABLE_BZ(RX_FILTER_TBL0), 366 REGISTER_TABLE_DZ(BIU_MC_SFT_STATUS), 367 }; 368 369 size_t efx_nic_get_regs_len(struct efx_nic *efx) 370 { 371 const struct efx_nic_reg *reg; 372 const struct efx_nic_reg_table *table; 373 size_t len = 0; 374 375 for (reg = efx_nic_regs; 376 reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs); 377 reg++) 378 if (efx->type->revision >= reg->min_revision && 379 efx->type->revision <= reg->max_revision) 380 len += sizeof(efx_oword_t); 381 382 for (table = efx_nic_reg_tables; 383 table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables); 384 table++) 385 if (efx->type->revision >= table->min_revision && 386 efx->type->revision <= table->max_revision) 387 len += table->rows * min_t(size_t, table->step, 16); 388 389 return len; 390 } 391 392 void efx_nic_get_regs(struct efx_nic *efx, void *buf) 393 { 394 const struct efx_nic_reg *reg; 395 const struct efx_nic_reg_table *table; 396 397 for (reg = efx_nic_regs; 398 reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs); 399 reg++) { 400 if (efx->type->revision >= reg->min_revision && 401 efx->type->revision <= reg->max_revision) { 402 efx_reado(efx, (efx_oword_t *)buf, reg->offset); 403 buf += sizeof(efx_oword_t); 404 } 405 } 406 407 for (table = efx_nic_reg_tables; 408 table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables); 409 table++) { 410 size_t size, i; 411 412 if (!(efx->type->revision >= table->min_revision && 413 efx->type->revision <= table->max_revision)) 414 continue; 415 416 size = min_t(size_t, table->step, 16); 417 418 for (i = 0; i < table->rows; i++) { 419 switch (table->step) { 420 case 4: /* 32-bit SRAM */ 421 efx_readd(efx, buf, table->offset + 4 * i); 422 break; 423 case 8: /* 64-bit SRAM */ 424 efx_sram_readq(efx, 425 efx->membase + table->offset, 426 buf, i); 427 break; 428 case 16: /* 128-bit-readable register */ 429 efx_reado_table(efx, buf, table->offset, i); 430 break; 431 case 32: /* 128-bit register, interleaved */ 432 efx_reado_table(efx, buf, table->offset, 2 * i); 433 break; 434 default: 435 WARN_ON(1); 436 return; 437 } 438 buf += size; 439 } 440 } 441 } 442 443 /** 444 * efx_nic_describe_stats - Describe supported statistics for ethtool 445 * @desc: Array of &struct efx_hw_stat_desc describing the statistics 446 * @count: Length of the @desc array 447 * @mask: Bitmask of which elements of @desc are enabled 448 * @names: Buffer to copy names to, or %NULL. The names are copied 449 * starting at intervals of %ETH_GSTRING_LEN bytes. 450 * 451 * Returns the number of visible statistics, i.e. the number of set 452 * bits in the first @count bits of @mask for which a name is defined. 453 */ 454 size_t efx_nic_describe_stats(const struct efx_hw_stat_desc *desc, size_t count, 455 const unsigned long *mask, u8 *names) 456 { 457 size_t visible = 0; 458 size_t index; 459 460 for_each_set_bit(index, mask, count) { 461 if (desc[index].name) { 462 if (names) { 463 strlcpy(names, desc[index].name, 464 ETH_GSTRING_LEN); 465 names += ETH_GSTRING_LEN; 466 } 467 ++visible; 468 } 469 } 470 471 return visible; 472 } 473 474 /** 475 * efx_nic_update_stats - Convert statistics DMA buffer to array of u64 476 * @desc: Array of &struct efx_hw_stat_desc describing the DMA buffer 477 * layout. DMA widths of 0, 16, 32 and 64 are supported; where 478 * the width is specified as 0 the corresponding element of 479 * @stats is not updated. 480 * @count: Length of the @desc array 481 * @mask: Bitmask of which elements of @desc are enabled 482 * @stats: Buffer to update with the converted statistics. The length 483 * of this array must be at least @count. 484 * @dma_buf: DMA buffer containing hardware statistics 485 * @accumulate: If set, the converted values will be added rather than 486 * directly stored to the corresponding elements of @stats 487 */ 488 void efx_nic_update_stats(const struct efx_hw_stat_desc *desc, size_t count, 489 const unsigned long *mask, 490 u64 *stats, const void *dma_buf, bool accumulate) 491 { 492 size_t index; 493 494 for_each_set_bit(index, mask, count) { 495 if (desc[index].dma_width) { 496 const void *addr = dma_buf + desc[index].offset; 497 u64 val; 498 499 switch (desc[index].dma_width) { 500 case 16: 501 val = le16_to_cpup((__le16 *)addr); 502 break; 503 case 32: 504 val = le32_to_cpup((__le32 *)addr); 505 break; 506 case 64: 507 val = le64_to_cpup((__le64 *)addr); 508 break; 509 default: 510 WARN_ON(1); 511 val = 0; 512 break; 513 } 514 515 if (accumulate) 516 stats[index] += val; 517 else 518 stats[index] = val; 519 } 520 } 521 } 522 523 void efx_nic_fix_nodesc_drop_stat(struct efx_nic *efx, u64 *rx_nodesc_drops) 524 { 525 /* if down, or this is the first update after coming up */ 526 if (!(efx->net_dev->flags & IFF_UP) || !efx->rx_nodesc_drops_prev_state) 527 efx->rx_nodesc_drops_while_down += 528 *rx_nodesc_drops - efx->rx_nodesc_drops_total; 529 efx->rx_nodesc_drops_total = *rx_nodesc_drops; 530 efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP); 531 *rx_nodesc_drops -= efx->rx_nodesc_drops_while_down; 532 } 533