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 "farch_regs.h" 23 #include "io.h" 24 #include "workarounds.h" 25 26 /************************************************************************** 27 * 28 * Generic buffer handling 29 * These buffers are used for interrupt status, MAC stats, etc. 30 * 31 **************************************************************************/ 32 33 int ef4_nic_alloc_buffer(struct ef4_nic *efx, struct ef4_buffer *buffer, 34 unsigned int len, gfp_t gfp_flags) 35 { 36 buffer->addr = dma_zalloc_coherent(&efx->pci_dev->dev, len, 37 &buffer->dma_addr, gfp_flags); 38 if (!buffer->addr) 39 return -ENOMEM; 40 buffer->len = len; 41 return 0; 42 } 43 44 void ef4_nic_free_buffer(struct ef4_nic *efx, struct ef4_buffer *buffer) 45 { 46 if (buffer->addr) { 47 dma_free_coherent(&efx->pci_dev->dev, buffer->len, 48 buffer->addr, buffer->dma_addr); 49 buffer->addr = NULL; 50 } 51 } 52 53 /* Check whether an event is present in the eventq at the current 54 * read pointer. Only useful for self-test. 55 */ 56 bool ef4_nic_event_present(struct ef4_channel *channel) 57 { 58 return ef4_event_present(ef4_event(channel, channel->eventq_read_ptr)); 59 } 60 61 void ef4_nic_event_test_start(struct ef4_channel *channel) 62 { 63 channel->event_test_cpu = -1; 64 smp_wmb(); 65 channel->efx->type->ev_test_generate(channel); 66 } 67 68 int ef4_nic_irq_test_start(struct ef4_nic *efx) 69 { 70 efx->last_irq_cpu = -1; 71 smp_wmb(); 72 return efx->type->irq_test_generate(efx); 73 } 74 75 /* Hook interrupt handler(s) 76 * Try MSI and then legacy interrupts. 77 */ 78 int ef4_nic_init_interrupt(struct ef4_nic *efx) 79 { 80 struct ef4_channel *channel; 81 unsigned int n_irqs; 82 int rc; 83 84 if (!EF4_INT_MODE_USE_MSI(efx)) { 85 rc = request_irq(efx->legacy_irq, 86 efx->type->irq_handle_legacy, IRQF_SHARED, 87 efx->name, efx); 88 if (rc) { 89 netif_err(efx, drv, efx->net_dev, 90 "failed to hook legacy IRQ %d\n", 91 efx->pci_dev->irq); 92 goto fail1; 93 } 94 return 0; 95 } 96 97 #ifdef CONFIG_RFS_ACCEL 98 if (efx->interrupt_mode == EF4_INT_MODE_MSIX) { 99 efx->net_dev->rx_cpu_rmap = 100 alloc_irq_cpu_rmap(efx->n_rx_channels); 101 if (!efx->net_dev->rx_cpu_rmap) { 102 rc = -ENOMEM; 103 goto fail1; 104 } 105 } 106 #endif 107 108 /* Hook MSI or MSI-X interrupt */ 109 n_irqs = 0; 110 ef4_for_each_channel(channel, efx) { 111 rc = request_irq(channel->irq, efx->type->irq_handle_msi, 112 IRQF_PROBE_SHARED, /* Not shared */ 113 efx->msi_context[channel->channel].name, 114 &efx->msi_context[channel->channel]); 115 if (rc) { 116 netif_err(efx, drv, efx->net_dev, 117 "failed to hook IRQ %d\n", channel->irq); 118 goto fail2; 119 } 120 ++n_irqs; 121 122 #ifdef CONFIG_RFS_ACCEL 123 if (efx->interrupt_mode == EF4_INT_MODE_MSIX && 124 channel->channel < efx->n_rx_channels) { 125 rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap, 126 channel->irq); 127 if (rc) 128 goto fail2; 129 } 130 #endif 131 } 132 133 return 0; 134 135 fail2: 136 #ifdef CONFIG_RFS_ACCEL 137 free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap); 138 efx->net_dev->rx_cpu_rmap = NULL; 139 #endif 140 ef4_for_each_channel(channel, efx) { 141 if (n_irqs-- == 0) 142 break; 143 free_irq(channel->irq, &efx->msi_context[channel->channel]); 144 } 145 fail1: 146 return rc; 147 } 148 149 void ef4_nic_fini_interrupt(struct ef4_nic *efx) 150 { 151 struct ef4_channel *channel; 152 153 #ifdef CONFIG_RFS_ACCEL 154 free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap); 155 efx->net_dev->rx_cpu_rmap = NULL; 156 #endif 157 158 if (EF4_INT_MODE_USE_MSI(efx)) { 159 /* Disable MSI/MSI-X interrupts */ 160 ef4_for_each_channel(channel, efx) 161 free_irq(channel->irq, 162 &efx->msi_context[channel->channel]); 163 } else { 164 /* Disable legacy interrupt */ 165 free_irq(efx->legacy_irq, efx); 166 } 167 } 168 169 /* Register dump */ 170 171 #define REGISTER_REVISION_FA 1 172 #define REGISTER_REVISION_FB 2 173 #define REGISTER_REVISION_FC 3 174 #define REGISTER_REVISION_FZ 3 /* last Falcon arch revision */ 175 #define REGISTER_REVISION_ED 4 176 #define REGISTER_REVISION_EZ 4 /* latest EF10 revision */ 177 178 struct ef4_nic_reg { 179 u32 offset:24; 180 u32 min_revision:3, max_revision:3; 181 }; 182 183 #define REGISTER(name, arch, min_rev, max_rev) { \ 184 arch ## R_ ## min_rev ## max_rev ## _ ## name, \ 185 REGISTER_REVISION_ ## arch ## min_rev, \ 186 REGISTER_REVISION_ ## arch ## max_rev \ 187 } 188 #define REGISTER_AA(name) REGISTER(name, F, A, A) 189 #define REGISTER_AB(name) REGISTER(name, F, A, B) 190 #define REGISTER_AZ(name) REGISTER(name, F, A, Z) 191 #define REGISTER_BB(name) REGISTER(name, F, B, B) 192 #define REGISTER_BZ(name) REGISTER(name, F, B, Z) 193 #define REGISTER_CZ(name) REGISTER(name, F, C, Z) 194 195 static const struct ef4_nic_reg ef4_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 }; 301 302 struct ef4_nic_reg_table { 303 u32 offset:24; 304 u32 min_revision:3, max_revision:3; 305 u32 step:6, rows:21; 306 }; 307 308 #define REGISTER_TABLE_DIMENSIONS(_, offset, arch, min_rev, max_rev, step, rows) { \ 309 offset, \ 310 REGISTER_REVISION_ ## arch ## min_rev, \ 311 REGISTER_REVISION_ ## arch ## max_rev, \ 312 step, rows \ 313 } 314 #define REGISTER_TABLE(name, arch, min_rev, max_rev) \ 315 REGISTER_TABLE_DIMENSIONS( \ 316 name, arch ## R_ ## min_rev ## max_rev ## _ ## name, \ 317 arch, min_rev, max_rev, \ 318 arch ## R_ ## min_rev ## max_rev ## _ ## name ## _STEP, \ 319 arch ## R_ ## min_rev ## max_rev ## _ ## name ## _ROWS) 320 #define REGISTER_TABLE_AA(name) REGISTER_TABLE(name, F, A, A) 321 #define REGISTER_TABLE_AZ(name) REGISTER_TABLE(name, F, A, Z) 322 #define REGISTER_TABLE_BB(name) REGISTER_TABLE(name, F, B, B) 323 #define REGISTER_TABLE_BZ(name) REGISTER_TABLE(name, F, B, Z) 324 #define REGISTER_TABLE_BB_CZ(name) \ 325 REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, B, B, \ 326 FR_BZ_ ## name ## _STEP, \ 327 FR_BB_ ## name ## _ROWS), \ 328 REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, C, Z, \ 329 FR_BZ_ ## name ## _STEP, \ 330 FR_CZ_ ## name ## _ROWS) 331 #define REGISTER_TABLE_CZ(name) REGISTER_TABLE(name, F, C, Z) 332 333 static const struct ef4_nic_reg_table ef4_nic_reg_tables[] = { 334 /* DRIVER is not used */ 335 /* EVQ_RPTR, TIMER_COMMAND, USR_EV and {RX,TX}_DESC_UPD are WO */ 336 REGISTER_TABLE_BB(TX_IPFIL_TBL), 337 REGISTER_TABLE_BB(TX_SRC_MAC_TBL), 338 REGISTER_TABLE_AA(RX_DESC_PTR_TBL_KER), 339 REGISTER_TABLE_BB_CZ(RX_DESC_PTR_TBL), 340 REGISTER_TABLE_AA(TX_DESC_PTR_TBL_KER), 341 REGISTER_TABLE_BB_CZ(TX_DESC_PTR_TBL), 342 REGISTER_TABLE_AA(EVQ_PTR_TBL_KER), 343 REGISTER_TABLE_BB_CZ(EVQ_PTR_TBL), 344 /* We can't reasonably read all of the buffer table (up to 8MB!). 345 * However this driver will only use a few entries. Reading 346 * 1K entries allows for some expansion of queue count and 347 * size before we need to change the version. */ 348 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL_KER, FR_AA_BUF_FULL_TBL_KER, 349 F, A, A, 8, 1024), 350 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL, FR_BZ_BUF_FULL_TBL, 351 F, B, Z, 8, 1024), 352 REGISTER_TABLE_CZ(RX_MAC_FILTER_TBL0), 353 REGISTER_TABLE_BB_CZ(TIMER_TBL), 354 REGISTER_TABLE_BB_CZ(TX_PACE_TBL), 355 REGISTER_TABLE_BZ(RX_INDIRECTION_TBL), 356 /* TX_FILTER_TBL0 is huge and not used by this driver */ 357 REGISTER_TABLE_CZ(TX_MAC_FILTER_TBL0), 358 REGISTER_TABLE_CZ(MC_TREG_SMEM), 359 /* MSIX_PBA_TABLE is not mapped */ 360 /* SRM_DBG is not mapped (and is redundant with BUF_FLL_TBL) */ 361 REGISTER_TABLE_BZ(RX_FILTER_TBL0), 362 }; 363 364 size_t ef4_nic_get_regs_len(struct ef4_nic *efx) 365 { 366 const struct ef4_nic_reg *reg; 367 const struct ef4_nic_reg_table *table; 368 size_t len = 0; 369 370 for (reg = ef4_nic_regs; 371 reg < ef4_nic_regs + ARRAY_SIZE(ef4_nic_regs); 372 reg++) 373 if (efx->type->revision >= reg->min_revision && 374 efx->type->revision <= reg->max_revision) 375 len += sizeof(ef4_oword_t); 376 377 for (table = ef4_nic_reg_tables; 378 table < ef4_nic_reg_tables + ARRAY_SIZE(ef4_nic_reg_tables); 379 table++) 380 if (efx->type->revision >= table->min_revision && 381 efx->type->revision <= table->max_revision) 382 len += table->rows * min_t(size_t, table->step, 16); 383 384 return len; 385 } 386 387 void ef4_nic_get_regs(struct ef4_nic *efx, void *buf) 388 { 389 const struct ef4_nic_reg *reg; 390 const struct ef4_nic_reg_table *table; 391 392 for (reg = ef4_nic_regs; 393 reg < ef4_nic_regs + ARRAY_SIZE(ef4_nic_regs); 394 reg++) { 395 if (efx->type->revision >= reg->min_revision && 396 efx->type->revision <= reg->max_revision) { 397 ef4_reado(efx, (ef4_oword_t *)buf, reg->offset); 398 buf += sizeof(ef4_oword_t); 399 } 400 } 401 402 for (table = ef4_nic_reg_tables; 403 table < ef4_nic_reg_tables + ARRAY_SIZE(ef4_nic_reg_tables); 404 table++) { 405 size_t size, i; 406 407 if (!(efx->type->revision >= table->min_revision && 408 efx->type->revision <= table->max_revision)) 409 continue; 410 411 size = min_t(size_t, table->step, 16); 412 413 for (i = 0; i < table->rows; i++) { 414 switch (table->step) { 415 case 4: /* 32-bit SRAM */ 416 ef4_readd(efx, buf, table->offset + 4 * i); 417 break; 418 case 8: /* 64-bit SRAM */ 419 ef4_sram_readq(efx, 420 efx->membase + table->offset, 421 buf, i); 422 break; 423 case 16: /* 128-bit-readable register */ 424 ef4_reado_table(efx, buf, table->offset, i); 425 break; 426 case 32: /* 128-bit register, interleaved */ 427 ef4_reado_table(efx, buf, table->offset, 2 * i); 428 break; 429 default: 430 WARN_ON(1); 431 return; 432 } 433 buf += size; 434 } 435 } 436 } 437 438 /** 439 * ef4_nic_describe_stats - Describe supported statistics for ethtool 440 * @desc: Array of &struct ef4_hw_stat_desc describing the statistics 441 * @count: Length of the @desc array 442 * @mask: Bitmask of which elements of @desc are enabled 443 * @names: Buffer to copy names to, or %NULL. The names are copied 444 * starting at intervals of %ETH_GSTRING_LEN bytes. 445 * 446 * Returns the number of visible statistics, i.e. the number of set 447 * bits in the first @count bits of @mask for which a name is defined. 448 */ 449 size_t ef4_nic_describe_stats(const struct ef4_hw_stat_desc *desc, size_t count, 450 const unsigned long *mask, u8 *names) 451 { 452 size_t visible = 0; 453 size_t index; 454 455 for_each_set_bit(index, mask, count) { 456 if (desc[index].name) { 457 if (names) { 458 strlcpy(names, desc[index].name, 459 ETH_GSTRING_LEN); 460 names += ETH_GSTRING_LEN; 461 } 462 ++visible; 463 } 464 } 465 466 return visible; 467 } 468 469 /** 470 * ef4_nic_update_stats - Convert statistics DMA buffer to array of u64 471 * @desc: Array of &struct ef4_hw_stat_desc describing the DMA buffer 472 * layout. DMA widths of 0, 16, 32 and 64 are supported; where 473 * the width is specified as 0 the corresponding element of 474 * @stats is not updated. 475 * @count: Length of the @desc array 476 * @mask: Bitmask of which elements of @desc are enabled 477 * @stats: Buffer to update with the converted statistics. The length 478 * of this array must be at least @count. 479 * @dma_buf: DMA buffer containing hardware statistics 480 * @accumulate: If set, the converted values will be added rather than 481 * directly stored to the corresponding elements of @stats 482 */ 483 void ef4_nic_update_stats(const struct ef4_hw_stat_desc *desc, size_t count, 484 const unsigned long *mask, 485 u64 *stats, const void *dma_buf, bool accumulate) 486 { 487 size_t index; 488 489 for_each_set_bit(index, mask, count) { 490 if (desc[index].dma_width) { 491 const void *addr = dma_buf + desc[index].offset; 492 u64 val; 493 494 switch (desc[index].dma_width) { 495 case 16: 496 val = le16_to_cpup((__le16 *)addr); 497 break; 498 case 32: 499 val = le32_to_cpup((__le32 *)addr); 500 break; 501 case 64: 502 val = le64_to_cpup((__le64 *)addr); 503 break; 504 default: 505 WARN_ON(1); 506 val = 0; 507 break; 508 } 509 510 if (accumulate) 511 stats[index] += val; 512 else 513 stats[index] = val; 514 } 515 } 516 } 517 518 void ef4_nic_fix_nodesc_drop_stat(struct ef4_nic *efx, u64 *rx_nodesc_drops) 519 { 520 /* if down, or this is the first update after coming up */ 521 if (!(efx->net_dev->flags & IFF_UP) || !efx->rx_nodesc_drops_prev_state) 522 efx->rx_nodesc_drops_while_down += 523 *rx_nodesc_drops - efx->rx_nodesc_drops_total; 524 efx->rx_nodesc_drops_total = *rx_nodesc_drops; 525 efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP); 526 *rx_nodesc_drops -= efx->rx_nodesc_drops_while_down; 527 } 528