1// SPDX-License-Identifier: GPL-2.0-only
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2006-2013 Solarflare Communications Inc.
6 */
7
8#include <linux/bitops.h>
9#include <linux/delay.h>
10#include <linux/interrupt.h>
11#include <linux/pci.h>
12#include <linux/module.h>
13#include <linux/seq_file.h>
14#include <linux/cpu_rmap.h>
15#include "net_driver.h"
16#include "bitfield.h"
17#include "efx.h"
18#include "nic.h"
19#include "farch_regs.h"
20#include "io.h"
21#include "workarounds.h"
22#include "mcdi_pcol.h"
23
24/**************************************************************************
25 *
26 * Generic buffer handling
27 * These buffers are used for interrupt status, MAC stats, etc.
28 *
29 **************************************************************************/
30
31int efx_siena_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer,
32 unsigned int len, gfp_t gfp_flags)
33{
34 buffer->addr = dma_alloc_coherent(dev: &efx->pci_dev->dev, size: len,
35 dma_handle: &buffer->dma_addr, gfp: gfp_flags);
36 if (!buffer->addr)
37 return -ENOMEM;
38 buffer->len = len;
39 return 0;
40}
41
42void efx_siena_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
43{
44 if (buffer->addr) {
45 dma_free_coherent(dev: &efx->pci_dev->dev, size: buffer->len,
46 cpu_addr: buffer->addr, dma_handle: buffer->dma_addr);
47 buffer->addr = NULL;
48 }
49}
50
51/* Check whether an event is present in the eventq at the current
52 * read pointer. Only useful for self-test.
53 */
54bool efx_siena_event_present(struct efx_channel *channel)
55{
56 return efx_event_present(event: efx_event(channel, index: channel->eventq_read_ptr));
57}
58
59void efx_siena_event_test_start(struct efx_channel *channel)
60{
61 channel->event_test_cpu = -1;
62 smp_wmb();
63 channel->efx->type->ev_test_generate(channel);
64}
65
66int efx_siena_irq_test_start(struct efx_nic *efx)
67{
68 efx->last_irq_cpu = -1;
69 smp_wmb();
70 return efx->type->irq_test_generate(efx);
71}
72
73/* Hook interrupt handler(s)
74 * Try MSI and then legacy interrupts.
75 */
76int efx_siena_init_interrupt(struct efx_nic *efx)
77{
78 struct efx_channel *channel;
79 unsigned int n_irqs;
80 int rc;
81
82 if (!EFX_INT_MODE_USE_MSI(efx)) {
83 rc = request_irq(irq: efx->legacy_irq,
84 handler: efx->type->irq_handle_legacy, IRQF_SHARED,
85 name: efx->name, dev: efx);
86 if (rc) {
87 netif_err(efx, drv, efx->net_dev,
88 "failed to hook legacy IRQ %d\n",
89 efx->pci_dev->irq);
90 goto fail1;
91 }
92 efx->irqs_hooked = true;
93 return 0;
94 }
95
96#ifdef CONFIG_RFS_ACCEL
97 if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
98 efx->net_dev->rx_cpu_rmap =
99 alloc_irq_cpu_rmap(size: efx->n_rx_channels);
100 if (!efx->net_dev->rx_cpu_rmap) {
101 rc = -ENOMEM;
102 goto fail1;
103 }
104 }
105#endif
106
107 /* Hook MSI or MSI-X interrupt */
108 n_irqs = 0;
109 efx_for_each_channel(channel, efx) {
110 rc = request_irq(irq: channel->irq, handler: efx->type->irq_handle_msi,
111 IRQF_PROBE_SHARED, /* Not shared */
112 name: efx->msi_context[channel->channel].name,
113 dev: &efx->msi_context[channel->channel]);
114 if (rc) {
115 netif_err(efx, drv, efx->net_dev,
116 "failed to hook IRQ %d\n", channel->irq);
117 goto fail2;
118 }
119 ++n_irqs;
120
121#ifdef CONFIG_RFS_ACCEL
122 if (efx->interrupt_mode == EFX_INT_MODE_MSIX &&
123 channel->channel < efx->n_rx_channels) {
124 rc = irq_cpu_rmap_add(rmap: efx->net_dev->rx_cpu_rmap,
125 irq: channel->irq);
126 if (rc)
127 goto fail2;
128 }
129#endif
130 }
131
132 efx->irqs_hooked = true;
133 return 0;
134
135 fail2:
136#ifdef CONFIG_RFS_ACCEL
137 free_irq_cpu_rmap(rmap: efx->net_dev->rx_cpu_rmap);
138 efx->net_dev->rx_cpu_rmap = NULL;
139#endif
140 efx_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
149void efx_siena_fini_interrupt(struct efx_nic *efx)
150{
151 struct efx_channel *channel;
152
153#ifdef CONFIG_RFS_ACCEL
154 free_irq_cpu_rmap(rmap: efx->net_dev->rx_cpu_rmap);
155 efx->net_dev->rx_cpu_rmap = NULL;
156#endif
157
158 if (!efx->irqs_hooked)
159 return;
160 if (EFX_INT_MODE_USE_MSI(efx)) {
161 /* Disable MSI/MSI-X interrupts */
162 efx_for_each_channel(channel, efx)
163 free_irq(channel->irq,
164 &efx->msi_context[channel->channel]);
165 } else {
166 /* Disable legacy interrupt */
167 free_irq(efx->legacy_irq, efx);
168 }
169 efx->irqs_hooked = false;
170}
171
172/* Register dump */
173
174#define REGISTER_REVISION_FA 1
175#define REGISTER_REVISION_FB 2
176#define REGISTER_REVISION_FC 3
177#define REGISTER_REVISION_FZ 3 /* last Falcon arch revision */
178#define REGISTER_REVISION_ED 4
179#define REGISTER_REVISION_EZ 4 /* latest EF10 revision */
180
181struct efx_nic_reg {
182 u32 offset:24;
183 u32 min_revision:3, max_revision:3;
184};
185
186#define REGISTER(name, arch, min_rev, max_rev) { \
187 arch ## R_ ## min_rev ## max_rev ## _ ## name, \
188 REGISTER_REVISION_ ## arch ## min_rev, \
189 REGISTER_REVISION_ ## arch ## max_rev \
190}
191#define REGISTER_AA(name) REGISTER(name, F, A, A)
192#define REGISTER_AB(name) REGISTER(name, F, A, B)
193#define REGISTER_AZ(name) REGISTER(name, F, A, Z)
194#define REGISTER_BB(name) REGISTER(name, F, B, B)
195#define REGISTER_BZ(name) REGISTER(name, F, B, Z)
196#define REGISTER_CZ(name) REGISTER(name, F, C, Z)
197
198static const struct efx_nic_reg efx_nic_regs[] = {
199 REGISTER_AZ(ADR_REGION),
200 REGISTER_AZ(INT_EN_KER),
201 REGISTER_BZ(INT_EN_CHAR),
202 REGISTER_AZ(INT_ADR_KER),
203 REGISTER_BZ(INT_ADR_CHAR),
204 /* INT_ACK_KER is WO */
205 /* INT_ISR0 is RC */
206 REGISTER_AZ(HW_INIT),
207 REGISTER_CZ(USR_EV_CFG),
208 REGISTER_AB(EE_SPI_HCMD),
209 REGISTER_AB(EE_SPI_HADR),
210 REGISTER_AB(EE_SPI_HDATA),
211 REGISTER_AB(EE_BASE_PAGE),
212 REGISTER_AB(EE_VPD_CFG0),
213 /* EE_VPD_SW_CNTL and EE_VPD_SW_DATA are not used */
214 /* PMBX_DBG_IADDR and PBMX_DBG_IDATA are indirect */
215 /* PCIE_CORE_INDIRECT is indirect */
216 REGISTER_AB(NIC_STAT),
217 REGISTER_AB(GPIO_CTL),
218 REGISTER_AB(GLB_CTL),
219 /* FATAL_INTR_KER and FATAL_INTR_CHAR are partly RC */
220 REGISTER_BZ(DP_CTRL),
221 REGISTER_AZ(MEM_STAT),
222 REGISTER_AZ(CS_DEBUG),
223 REGISTER_AZ(ALTERA_BUILD),
224 REGISTER_AZ(CSR_SPARE),
225 REGISTER_AB(PCIE_SD_CTL0123),
226 REGISTER_AB(PCIE_SD_CTL45),
227 REGISTER_AB(PCIE_PCS_CTL_STAT),
228 /* DEBUG_DATA_OUT is not used */
229 /* DRV_EV is WO */
230 REGISTER_AZ(EVQ_CTL),
231 REGISTER_AZ(EVQ_CNT1),
232 REGISTER_AZ(EVQ_CNT2),
233 REGISTER_AZ(BUF_TBL_CFG),
234 REGISTER_AZ(SRM_RX_DC_CFG),
235 REGISTER_AZ(SRM_TX_DC_CFG),
236 REGISTER_AZ(SRM_CFG),
237 /* BUF_TBL_UPD is WO */
238 REGISTER_AZ(SRM_UPD_EVQ),
239 REGISTER_AZ(SRAM_PARITY),
240 REGISTER_AZ(RX_CFG),
241 REGISTER_BZ(RX_FILTER_CTL),
242 /* RX_FLUSH_DESCQ is WO */
243 REGISTER_AZ(RX_DC_CFG),
244 REGISTER_AZ(RX_DC_PF_WM),
245 REGISTER_BZ(RX_RSS_TKEY),
246 /* RX_NODESC_DROP is RC */
247 REGISTER_AA(RX_SELF_RST),
248 /* RX_DEBUG, RX_PUSH_DROP are not used */
249 REGISTER_CZ(RX_RSS_IPV6_REG1),
250 REGISTER_CZ(RX_RSS_IPV6_REG2),
251 REGISTER_CZ(RX_RSS_IPV6_REG3),
252 /* TX_FLUSH_DESCQ is WO */
253 REGISTER_AZ(TX_DC_CFG),
254 REGISTER_AA(TX_CHKSM_CFG),
255 REGISTER_AZ(TX_CFG),
256 /* TX_PUSH_DROP is not used */
257 REGISTER_AZ(TX_RESERVED),
258 REGISTER_BZ(TX_PACE),
259 /* TX_PACE_DROP_QID is RC */
260 REGISTER_BB(TX_VLAN),
261 REGISTER_BZ(TX_IPFIL_PORTEN),
262 REGISTER_AB(MD_TXD),
263 REGISTER_AB(MD_RXD),
264 REGISTER_AB(MD_CS),
265 REGISTER_AB(MD_PHY_ADR),
266 REGISTER_AB(MD_ID),
267 /* MD_STAT is RC */
268 REGISTER_AB(MAC_STAT_DMA),
269 REGISTER_AB(MAC_CTRL),
270 REGISTER_BB(GEN_MODE),
271 REGISTER_AB(MAC_MC_HASH_REG0),
272 REGISTER_AB(MAC_MC_HASH_REG1),
273 REGISTER_AB(GM_CFG1),
274 REGISTER_AB(GM_CFG2),
275 /* GM_IPG and GM_HD are not used */
276 REGISTER_AB(GM_MAX_FLEN),
277 /* GM_TEST is not used */
278 REGISTER_AB(GM_ADR1),
279 REGISTER_AB(GM_ADR2),
280 REGISTER_AB(GMF_CFG0),
281 REGISTER_AB(GMF_CFG1),
282 REGISTER_AB(GMF_CFG2),
283 REGISTER_AB(GMF_CFG3),
284 REGISTER_AB(GMF_CFG4),
285 REGISTER_AB(GMF_CFG5),
286 REGISTER_BB(TX_SRC_MAC_CTL),
287 REGISTER_AB(XM_ADR_LO),
288 REGISTER_AB(XM_ADR_HI),
289 REGISTER_AB(XM_GLB_CFG),
290 REGISTER_AB(XM_TX_CFG),
291 REGISTER_AB(XM_RX_CFG),
292 REGISTER_AB(XM_MGT_INT_MASK),
293 REGISTER_AB(XM_FC),
294 REGISTER_AB(XM_PAUSE_TIME),
295 REGISTER_AB(XM_TX_PARAM),
296 REGISTER_AB(XM_RX_PARAM),
297 /* XM_MGT_INT_MSK (note no 'A') is RC */
298 REGISTER_AB(XX_PWR_RST),
299 REGISTER_AB(XX_SD_CTL),
300 REGISTER_AB(XX_TXDRV_CTL),
301 /* XX_PRBS_CTL, XX_PRBS_CHK and XX_PRBS_ERR are not used */
302 /* XX_CORE_STAT is partly RC */
303};
304
305struct 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
336static const struct efx_nic_reg_table efx_nic_reg_tables[] = {
337 /* DRIVER is not used */
338 /* EVQ_RPTR, TIMER_COMMAND, USR_EV and {RX,TX}_DESC_UPD are WO */
339 REGISTER_TABLE_BB(TX_IPFIL_TBL),
340 REGISTER_TABLE_BB(TX_SRC_MAC_TBL),
341 REGISTER_TABLE_AA(RX_DESC_PTR_TBL_KER),
342 REGISTER_TABLE_BB_CZ(RX_DESC_PTR_TBL),
343 REGISTER_TABLE_AA(TX_DESC_PTR_TBL_KER),
344 REGISTER_TABLE_BB_CZ(TX_DESC_PTR_TBL),
345 REGISTER_TABLE_AA(EVQ_PTR_TBL_KER),
346 REGISTER_TABLE_BB_CZ(EVQ_PTR_TBL),
347 /* We can't reasonably read all of the buffer table (up to 8MB!).
348 * However this driver will only use a few entries. Reading
349 * 1K entries allows for some expansion of queue count and
350 * size before we need to change the version. */
351 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL_KER, FR_AA_BUF_FULL_TBL_KER,
352 F, A, A, 8, 1024),
353 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL, FR_BZ_BUF_FULL_TBL,
354 F, B, Z, 8, 1024),
355 REGISTER_TABLE_CZ(RX_MAC_FILTER_TBL0),
356 REGISTER_TABLE_BB_CZ(TIMER_TBL),
357 REGISTER_TABLE_BB_CZ(TX_PACE_TBL),
358 REGISTER_TABLE_BZ(RX_INDIRECTION_TBL),
359 /* TX_FILTER_TBL0 is huge and not used by this driver */
360 REGISTER_TABLE_CZ(TX_MAC_FILTER_TBL0),
361 REGISTER_TABLE_CZ(MC_TREG_SMEM),
362 /* MSIX_PBA_TABLE is not mapped */
363 /* SRM_DBG is not mapped (and is redundant with BUF_FLL_TBL) */
364 REGISTER_TABLE_BZ(RX_FILTER_TBL0),
365};
366
367size_t efx_siena_get_regs_len(struct efx_nic *efx)
368{
369 const struct efx_nic_reg *reg;
370 const struct efx_nic_reg_table *table;
371 size_t len = 0;
372
373 for (reg = efx_nic_regs;
374 reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
375 reg++)
376 if (efx->type->revision >= reg->min_revision &&
377 efx->type->revision <= reg->max_revision)
378 len += sizeof(efx_oword_t);
379
380 for (table = efx_nic_reg_tables;
381 table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
382 table++)
383 if (efx->type->revision >= table->min_revision &&
384 efx->type->revision <= table->max_revision)
385 len += table->rows * min_t(size_t, table->step, 16);
386
387 return len;
388}
389
390void efx_siena_get_regs(struct efx_nic *efx, void *buf)
391{
392 const struct efx_nic_reg *reg;
393 const struct efx_nic_reg_table *table;
394
395 for (reg = efx_nic_regs;
396 reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
397 reg++) {
398 if (efx->type->revision >= reg->min_revision &&
399 efx->type->revision <= reg->max_revision) {
400 efx_reado(efx, value: (efx_oword_t *)buf, reg: reg->offset);
401 buf += sizeof(efx_oword_t);
402 }
403 }
404
405 for (table = efx_nic_reg_tables;
406 table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
407 table++) {
408 size_t size, i;
409
410 if (!(efx->type->revision >= table->min_revision &&
411 efx->type->revision <= table->max_revision))
412 continue;
413
414 size = min_t(size_t, table->step, 16);
415
416 for (i = 0; i < table->rows; i++) {
417 switch (table->step) {
418 case 4: /* 32-bit SRAM */
419 efx_readd(efx, value: buf, reg: table->offset + 4 * i);
420 break;
421 case 8: /* 64-bit SRAM */
422 efx_sram_readq(efx,
423 membase: efx->membase + table->offset,
424 value: buf, index: i);
425 break;
426 case 16: /* 128-bit-readable register */
427 efx_reado_table(efx, value: buf, reg: table->offset, index: i);
428 break;
429 case 32: /* 128-bit register, interleaved */
430 efx_reado_table(efx, value: buf, reg: table->offset, index: 2 * i);
431 break;
432 default:
433 WARN_ON(1);
434 return;
435 }
436 buf += size;
437 }
438 }
439}
440
441/**
442 * efx_siena_describe_stats - Describe supported statistics for ethtool
443 * @desc: Array of &struct efx_hw_stat_desc describing the statistics
444 * @count: Length of the @desc array
445 * @mask: Bitmask of which elements of @desc are enabled
446 * @names: Buffer to copy names to, or %NULL. The names are copied
447 * starting at intervals of %ETH_GSTRING_LEN bytes.
448 *
449 * Returns the number of visible statistics, i.e. the number of set
450 * bits in the first @count bits of @mask for which a name is defined.
451 */
452size_t efx_siena_describe_stats(const struct efx_hw_stat_desc *desc, size_t count,
453 const unsigned long *mask, u8 *names)
454{
455 size_t visible = 0;
456 size_t index;
457
458 for_each_set_bit(index, mask, count) {
459 if (desc[index].name) {
460 if (names) {
461 strscpy(names, desc[index].name,
462 ETH_GSTRING_LEN);
463 names += ETH_GSTRING_LEN;
464 }
465 ++visible;
466 }
467 }
468
469 return visible;
470}
471
472/**
473 * efx_siena_update_stats - Convert statistics DMA buffer to array of u64
474 * @desc: Array of &struct efx_hw_stat_desc describing the DMA buffer
475 * layout. DMA widths of 0, 16, 32 and 64 are supported; where
476 * the width is specified as 0 the corresponding element of
477 * @stats is not updated.
478 * @count: Length of the @desc array
479 * @mask: Bitmask of which elements of @desc are enabled
480 * @stats: Buffer to update with the converted statistics. The length
481 * of this array must be at least @count.
482 * @dma_buf: DMA buffer containing hardware statistics
483 * @accumulate: If set, the converted values will be added rather than
484 * directly stored to the corresponding elements of @stats
485 */
486void efx_siena_update_stats(const struct efx_hw_stat_desc *desc, size_t count,
487 const unsigned long *mask,
488 u64 *stats, const void *dma_buf, bool accumulate)
489{
490 size_t index;
491
492 for_each_set_bit(index, mask, count) {
493 if (desc[index].dma_width) {
494 const void *addr = dma_buf + desc[index].offset;
495 u64 val;
496
497 switch (desc[index].dma_width) {
498 case 16:
499 val = le16_to_cpup(p: (__le16 *)addr);
500 break;
501 case 32:
502 val = le32_to_cpup(p: (__le32 *)addr);
503 break;
504 case 64:
505 val = le64_to_cpup(p: (__le64 *)addr);
506 break;
507 default:
508 WARN_ON(1);
509 val = 0;
510 break;
511 }
512
513 if (accumulate)
514 stats[index] += val;
515 else
516 stats[index] = val;
517 }
518 }
519}
520
521void efx_siena_fix_nodesc_drop_stat(struct efx_nic *efx, u64 *rx_nodesc_drops)
522{
523 /* if down, or this is the first update after coming up */
524 if (!(efx->net_dev->flags & IFF_UP) || !efx->rx_nodesc_drops_prev_state)
525 efx->rx_nodesc_drops_while_down +=
526 *rx_nodesc_drops - efx->rx_nodesc_drops_total;
527 efx->rx_nodesc_drops_total = *rx_nodesc_drops;
528 efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP);
529 *rx_nodesc_drops -= efx->rx_nodesc_drops_while_down;
530}
531

source code of linux/drivers/net/ethernet/sfc/siena/nic.c