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sfc: Replace efx_rx_buffer::is_page and other booleans with a flags field
[deliverable/linux.git] / drivers / net / ethernet / sfc / nic.c
CommitLineData
8e730c15
BH		 1/****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
0a6f40c6 4 * Copyright 2006-2011 Solarflare Communications Inc.
8e730c15
BH		 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>
a6b7a407 13#include <linux/interrupt.h>
8e730c15
BH		 14#include <linux/pci.h>
15#include <linux/module.h>
16#include <linux/seq_file.h>
17#include "net_driver.h"
18#include "bitfield.h"
19#include "efx.h"
20#include "nic.h"
21#include "regs.h"
22#include "io.h"
23#include "workarounds.h"
24
25/**************************************************************************
26 *
27 * Configurable values
28 *
29 **************************************************************************
30 */
31
32/* This is set to 16 for a good reason. In summary, if larger than
33 * 16, the descriptor cache holds more than a default socket
34 * buffer's worth of packets (for UDP we can only have at most one
35 * socket buffer's worth outstanding). This combined with the fact
36 * that we only get 1 TX event per descriptor cache means the NIC
37 * goes idle.
38 */
39#define TX_DC_ENTRIES 16
40#define TX_DC_ENTRIES_ORDER 1
41
42#define RX_DC_ENTRIES 64
43#define RX_DC_ENTRIES_ORDER 3
44
8e730c15
BH		 45/* If EFX_MAX_INT_ERRORS internal errors occur within
46 * EFX_INT_ERROR_EXPIRE seconds, we consider the NIC broken and
47 * disable it.
48 */
49#define EFX_INT_ERROR_EXPIRE 3600
50#define EFX_MAX_INT_ERRORS 5
51
52/* We poll for events every FLUSH_INTERVAL ms, and check FLUSH_POLL_COUNT times
53 */
54#define EFX_FLUSH_INTERVAL 10
55#define EFX_FLUSH_POLL_COUNT 100
56
57/* Size and alignment of special buffers (4KB) */
58#define EFX_BUF_SIZE 4096
59
60/* Depth of RX flush request fifo */
61#define EFX_RX_FLUSH_COUNT 4
62
90d683af
SH		 63/* Generated event code for efx_generate_test_event() */
64#define EFX_CHANNEL_MAGIC_TEST(_channel) \
d730dc52
SH		 65 (0x00010100 + (_channel)->channel)
66
90d683af
SH		 67/* Generated event code for efx_generate_fill_event() */
68#define EFX_CHANNEL_MAGIC_FILL(_channel) \
69 (0x00010200 + (_channel)->channel)
70
8e730c15
BH		 71/**************************************************************************
72 *
73 * Solarstorm hardware access
74 *
75 **************************************************************************/
76
77static inline void efx_write_buf_tbl(struct efx_nic *efx, efx_qword_t *value,
78 unsigned int index)
79{
80 efx_sram_writeq(efx, efx->membase + efx->type->buf_tbl_base,
81 value, index);
82}
83
84/* Read the current event from the event queue */
85static inline efx_qword_t *efx_event(struct efx_channel *channel,
86 unsigned int index)
87{
d4fabcc8
BH		 88 return ((efx_qword_t *) (channel->eventq.addr)) +
89 (index & channel->eventq_mask);
8e730c15
BH		 90}
91
92/* See if an event is present
93 *
94 * We check both the high and low dword of the event for all ones. We
95 * wrote all ones when we cleared the event, and no valid event can
96 * have all ones in either its high or low dwords. This approach is
97 * robust against reordering.
98 *
99 * Note that using a single 64-bit comparison is incorrect; even
100 * though the CPU read will be atomic, the DMA write may not be.
101 */
102static inline int efx_event_present(efx_qword_t *event)
103{
807540ba
ED		 104 return !(EFX_DWORD_IS_ALL_ONES(event->dword[0]) |
105 EFX_DWORD_IS_ALL_ONES(event->dword[1]));
8e730c15
BH		 106}
107
108static bool efx_masked_compare_oword(const efx_oword_t *a, const efx_oword_t *b,
109 const efx_oword_t *mask)
110{
111 return ((a->u64[0] ^ b->u64[0]) & mask->u64[0]) ||
112 ((a->u64[1] ^ b->u64[1]) & mask->u64[1]);
113}
114
115int efx_nic_test_registers(struct efx_nic *efx,
116 const struct efx_nic_register_test *regs,
117 size_t n_regs)
118{
119 unsigned address = 0, i, j;
120 efx_oword_t mask, imask, original, reg, buf;
121
122 /* Falcon should be in loopback to isolate the XMAC from the PHY */
123 WARN_ON(!LOOPBACK_INTERNAL(efx));
124
125 for (i = 0; i < n_regs; ++i) {
126 address = regs[i].address;
127 mask = imask = regs[i].mask;
128 EFX_INVERT_OWORD(imask);
129
130 efx_reado(efx, &original, address);
131
132 /* bit sweep on and off */
133 for (j = 0; j < 128; j++) {
134 if (!EFX_EXTRACT_OWORD32(mask, j, j))
135 continue;
136
137 /* Test this testable bit can be set in isolation */
138 EFX_AND_OWORD(reg, original, mask);
139 EFX_SET_OWORD32(reg, j, j, 1);
140
141 efx_writeo(efx, &reg, address);
142 efx_reado(efx, &buf, address);
143
144 if (efx_masked_compare_oword(&reg, &buf, &mask))
145 goto fail;
146
147 /* Test this testable bit can be cleared in isolation */
148 EFX_OR_OWORD(reg, original, mask);
149 EFX_SET_OWORD32(reg, j, j, 0);
150
151 efx_writeo(efx, &reg, address);
152 efx_reado(efx, &buf, address);
153
154 if (efx_masked_compare_oword(&reg, &buf, &mask))
155 goto fail;
156 }
157
158 efx_writeo(efx, &original, address);
159 }
160
161 return 0;
162
163fail:
62776d03
BH		 164 netif_err(efx, hw, efx->net_dev,
165 "wrote "EFX_OWORD_FMT" read "EFX_OWORD_FMT
166 " at address 0x%x mask "EFX_OWORD_FMT"\n", EFX_OWORD_VAL(reg),
167 EFX_OWORD_VAL(buf), address, EFX_OWORD_VAL(mask));
8e730c15
BH		 168 return -EIO;
169}
170
171/**************************************************************************
172 *
173 * Special buffer handling
174 * Special buffers are used for event queues and the TX and RX
175 * descriptor rings.
176 *
177 *************************************************************************/
178
179/*
180 * Initialise a special buffer
181 *
182 * This will define a buffer (previously allocated via
183 * efx_alloc_special_buffer()) in the buffer table, allowing
184 * it to be used for event queues, descriptor rings etc.
185 */
186static void
187efx_init_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
188{
189 efx_qword_t buf_desc;
190 int index;
191 dma_addr_t dma_addr;
192 int i;
193
194 EFX_BUG_ON_PARANOID(!buffer->addr);
195
196 /* Write buffer descriptors to NIC */
197 for (i = 0; i < buffer->entries; i++) {
198 index = buffer->index + i;
199 dma_addr = buffer->dma_addr + (i * 4096);
62776d03
BH		 200 netif_dbg(efx, probe, efx->net_dev,
201 "mapping special buffer %d at %llx\n",
202 index, (unsigned long long)dma_addr);
8e730c15
BH		 203 EFX_POPULATE_QWORD_3(buf_desc,
204 FRF_AZ_BUF_ADR_REGION, 0,
205 FRF_AZ_BUF_ADR_FBUF, dma_addr >> 12,
206 FRF_AZ_BUF_OWNER_ID_FBUF, 0);
207 efx_write_buf_tbl(efx, &buf_desc, index);
208 }
209}
210
211/* Unmaps a buffer and clears the buffer table entries */
212static void
213efx_fini_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
214{
215 efx_oword_t buf_tbl_upd;
216 unsigned int start = buffer->index;
217 unsigned int end = (buffer->index + buffer->entries - 1);
218
219 if (!buffer->entries)
220 return;
221
62776d03
BH		 222 netif_dbg(efx, hw, efx->net_dev, "unmapping special buffers %d-%d\n",
223 buffer->index, buffer->index + buffer->entries - 1);
8e730c15
BH		 224
225 EFX_POPULATE_OWORD_4(buf_tbl_upd,
226 FRF_AZ_BUF_UPD_CMD, 0,
227 FRF_AZ_BUF_CLR_CMD, 1,
228 FRF_AZ_BUF_CLR_END_ID, end,
229 FRF_AZ_BUF_CLR_START_ID, start);
230 efx_writeo(efx, &buf_tbl_upd, FR_AZ_BUF_TBL_UPD);
231}
232
233/*
234 * Allocate a new special buffer
235 *
236 * This allocates memory for a new buffer, clears it and allocates a
237 * new buffer ID range. It does not write into the buffer table.
238 *
239 * This call will allocate 4KB buffers, since 8KB buffers can't be
240 * used for event queues and descriptor rings.
241 */
242static int efx_alloc_special_buffer(struct efx_nic *efx,
243 struct efx_special_buffer *buffer,
244 unsigned int len)
245{
246 len = ALIGN(len, EFX_BUF_SIZE);
247
58758aa5
BH		 248 buffer->addr = dma_alloc_coherent(&efx->pci_dev->dev, len,
249 &buffer->dma_addr, GFP_KERNEL);
8e730c15
BH		 250 if (!buffer->addr)
251 return -ENOMEM;
252 buffer->len = len;
253 buffer->entries = len / EFX_BUF_SIZE;
254 BUG_ON(buffer->dma_addr & (EFX_BUF_SIZE - 1));
255
256 /* All zeros is a potentially valid event so memset to 0xff */
257 memset(buffer->addr, 0xff, len);
258
259 /* Select new buffer ID */
260 buffer->index = efx->next_buffer_table;
261 efx->next_buffer_table += buffer->entries;
262
62776d03
BH		 263 netif_dbg(efx, probe, efx->net_dev,
264 "allocating special buffers %d-%d at %llx+%x "
265 "(virt %p phys %llx)\n", buffer->index,
266 buffer->index + buffer->entries - 1,
267 (u64)buffer->dma_addr, len,
268 buffer->addr, (u64)virt_to_phys(buffer->addr));
8e730c15
BH		 269
270 return 0;
271}
272
273static void
274efx_free_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
275{
276 if (!buffer->addr)
277 return;
278
62776d03
BH		 279 netif_dbg(efx, hw, efx->net_dev,
280 "deallocating special buffers %d-%d at %llx+%x "
281 "(virt %p phys %llx)\n", buffer->index,
282 buffer->index + buffer->entries - 1,
283 (u64)buffer->dma_addr, buffer->len,
284 buffer->addr, (u64)virt_to_phys(buffer->addr));
8e730c15 285
58758aa5
BH		 286 dma_free_coherent(&efx->pci_dev->dev, buffer->len, buffer->addr,
287 buffer->dma_addr);
8e730c15
BH		 288 buffer->addr = NULL;
289 buffer->entries = 0;
290}
291
292/**************************************************************************
293 *
294 * Generic buffer handling
295 * These buffers are used for interrupt status and MAC stats
296 *
297 **************************************************************************/
298
299int efx_nic_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer,
300 unsigned int len)
301{
302 buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
303 &buffer->dma_addr);
304 if (!buffer->addr)
305 return -ENOMEM;
306 buffer->len = len;
307 memset(buffer->addr, 0, len);
308 return 0;
309}
310
311void efx_nic_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
312{
313 if (buffer->addr) {
314 pci_free_consistent(efx->pci_dev, buffer->len,
315 buffer->addr, buffer->dma_addr);
316 buffer->addr = NULL;
317 }
318}
319
320/**************************************************************************
321 *
322 * TX path
323 *
324 **************************************************************************/
325
326/* Returns a pointer to the specified transmit descriptor in the TX
327 * descriptor queue belonging to the specified channel.
328 */
329static inline efx_qword_t *
330efx_tx_desc(struct efx_tx_queue *tx_queue, unsigned int index)
331{
807540ba 332 return ((efx_qword_t *) (tx_queue->txd.addr)) + index;
8e730c15
BH		 333}
334
335/* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */
336static inline void efx_notify_tx_desc(struct efx_tx_queue *tx_queue)
337{
338 unsigned write_ptr;
339 efx_dword_t reg;
340
ecc910f5 341 write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
8e730c15
BH		 342 EFX_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr);
343 efx_writed_page(tx_queue->efx, &reg,
344 FR_AZ_TX_DESC_UPD_DWORD_P0, tx_queue->queue);
345}
346
cd38557d
BH		 347/* Write pointer and first descriptor for TX descriptor ring */
348static inline void efx_push_tx_desc(struct efx_tx_queue *tx_queue,
349 const efx_qword_t *txd)
350{
351 unsigned write_ptr;
352 efx_oword_t reg;
353
354 BUILD_BUG_ON(FRF_AZ_TX_DESC_LBN != 0);
355 BUILD_BUG_ON(FR_AA_TX_DESC_UPD_KER != FR_BZ_TX_DESC_UPD_P0);
356
357 write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
358 EFX_POPULATE_OWORD_2(reg, FRF_AZ_TX_DESC_PUSH_CMD, true,
359 FRF_AZ_TX_DESC_WPTR, write_ptr);
360 reg.qword[0] = *txd;
361 efx_writeo_page(tx_queue->efx, &reg,
362 FR_BZ_TX_DESC_UPD_P0, tx_queue->queue);
363}
364
365static inline bool
366efx_may_push_tx_desc(struct efx_tx_queue *tx_queue, unsigned int write_count)
367{
368 unsigned empty_read_count = ACCESS_ONCE(tx_queue->empty_read_count);
369
370 if (empty_read_count == 0)
371 return false;
372
373 tx_queue->empty_read_count = 0;
374 return ((empty_read_count ^ write_count) & ~EFX_EMPTY_COUNT_VALID) == 0;
375}
8e730c15
BH		 376
377/* For each entry inserted into the software descriptor ring, create a
378 * descriptor in the hardware TX descriptor ring (in host memory), and
379 * write a doorbell.
380 */
381void efx_nic_push_buffers(struct efx_tx_queue *tx_queue)
382{
383
384 struct efx_tx_buffer *buffer;
385 efx_qword_t *txd;
386 unsigned write_ptr;
cd38557d 387 unsigned old_write_count = tx_queue->write_count;
8e730c15
BH		 388
389 BUG_ON(tx_queue->write_count == tx_queue->insert_count);
390
391 do {
ecc910f5 392 write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
8e730c15
BH		 393 buffer = &tx_queue->buffer[write_ptr];
394 txd = efx_tx_desc(tx_queue, write_ptr);
395 ++tx_queue->write_count;
396
397 /* Create TX descriptor ring entry */
398 EFX_POPULATE_QWORD_4(*txd,
399 FSF_AZ_TX_KER_CONT, buffer->continuation,
400 FSF_AZ_TX_KER_BYTE_COUNT, buffer->len,
401 FSF_AZ_TX_KER_BUF_REGION, 0,
402 FSF_AZ_TX_KER_BUF_ADDR, buffer->dma_addr);
403 } while (tx_queue->write_count != tx_queue->insert_count);
404
405 wmb(); /* Ensure descriptors are written before they are fetched */
cd38557d
BH		 406
407 if (efx_may_push_tx_desc(tx_queue, old_write_count)) {
408 txd = efx_tx_desc(tx_queue,
409 old_write_count & tx_queue->ptr_mask);
410 efx_push_tx_desc(tx_queue, txd);
411 ++tx_queue->pushes;
412 } else {
413 efx_notify_tx_desc(tx_queue);
414 }
8e730c15
BH		 415}
416
417/* Allocate hardware resources for a TX queue */
418int efx_nic_probe_tx(struct efx_tx_queue *tx_queue)
419{
420 struct efx_nic *efx = tx_queue->efx;
ecc910f5
SH		 421 unsigned entries;
422
423 entries = tx_queue->ptr_mask + 1;
8e730c15 424 return efx_alloc_special_buffer(efx, &tx_queue->txd,
ecc910f5 425 entries * sizeof(efx_qword_t));
8e730c15
BH		 426}
427
428void efx_nic_init_tx(struct efx_tx_queue *tx_queue)
429{
8e730c15 430 struct efx_nic *efx = tx_queue->efx;
94b274bf 431 efx_oword_t reg;
8e730c15
BH		 432
433 tx_queue->flushed = FLUSH_NONE;
434
435 /* Pin TX descriptor ring */
436 efx_init_special_buffer(efx, &tx_queue->txd);
437
438 /* Push TX descriptor ring to card */
94b274bf 439 EFX_POPULATE_OWORD_10(reg,
8e730c15
BH		 440 FRF_AZ_TX_DESCQ_EN, 1,
441 FRF_AZ_TX_ISCSI_DDIG_EN, 0,
442 FRF_AZ_TX_ISCSI_HDIG_EN, 0,
443 FRF_AZ_TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index,
444 FRF_AZ_TX_DESCQ_EVQ_ID,
445 tx_queue->channel->channel,
446 FRF_AZ_TX_DESCQ_OWNER_ID, 0,
447 FRF_AZ_TX_DESCQ_LABEL, tx_queue->queue,
448 FRF_AZ_TX_DESCQ_SIZE,
449 __ffs(tx_queue->txd.entries),
450 FRF_AZ_TX_DESCQ_TYPE, 0,
451 FRF_BZ_TX_NON_IP_DROP_DIS, 1);
452
453 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) {
a4900ac9 454 int csum = tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD;
94b274bf
BH		 455 EFX_SET_OWORD_FIELD(reg, FRF_BZ_TX_IP_CHKSM_DIS, !csum);
456 EFX_SET_OWORD_FIELD(reg, FRF_BZ_TX_TCP_CHKSM_DIS,
8e730c15
BH		 457 !csum);
458 }
459
94b274bf 460 efx_writeo_table(efx, &reg, efx->type->txd_ptr_tbl_base,
8e730c15
BH		 461 tx_queue->queue);
462
463 if (efx_nic_rev(efx) < EFX_REV_FALCON_B0) {
8e730c15 464 /* Only 128 bits in this register */
a4900ac9 465 BUILD_BUG_ON(EFX_MAX_TX_QUEUES > 128);
8e730c15
BH		 466
467 efx_reado(efx, &reg, FR_AA_TX_CHKSM_CFG);
a4900ac9 468 if (tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD)
8e730c15
BH		 469 clear_bit_le(tx_queue->queue, (void *)&reg);
470 else
471 set_bit_le(tx_queue->queue, (void *)&reg);
472 efx_writeo(efx, &reg, FR_AA_TX_CHKSM_CFG);
473 }
94b274bf
BH		 474
475 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) {
476 EFX_POPULATE_OWORD_1(reg,
477 FRF_BZ_TX_PACE,
478 (tx_queue->queue & EFX_TXQ_TYPE_HIGHPRI) ?
479 FFE_BZ_TX_PACE_OFF :
480 FFE_BZ_TX_PACE_RESERVED);
481 efx_writeo_table(efx, &reg, FR_BZ_TX_PACE_TBL,
482 tx_queue->queue);
483 }
8e730c15
BH		 484}
485
486static void efx_flush_tx_queue(struct efx_tx_queue *tx_queue)
487{
488 struct efx_nic *efx = tx_queue->efx;
489 efx_oword_t tx_flush_descq;
490
491 tx_queue->flushed = FLUSH_PENDING;
492
493 /* Post a flush command */
494 EFX_POPULATE_OWORD_2(tx_flush_descq,
495 FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
496 FRF_AZ_TX_FLUSH_DESCQ, tx_queue->queue);
497 efx_writeo(efx, &tx_flush_descq, FR_AZ_TX_FLUSH_DESCQ);
498}
499
500void efx_nic_fini_tx(struct efx_tx_queue *tx_queue)
501{
502 struct efx_nic *efx = tx_queue->efx;
503 efx_oword_t tx_desc_ptr;
504
505 /* The queue should have been flushed */
506 WARN_ON(tx_queue->flushed != FLUSH_DONE);
507
508 /* Remove TX descriptor ring from card */
509 EFX_ZERO_OWORD(tx_desc_ptr);
510 efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
511 tx_queue->queue);
512
513 /* Unpin TX descriptor ring */
514 efx_fini_special_buffer(efx, &tx_queue->txd);
515}
516
517/* Free buffers backing TX queue */
518void efx_nic_remove_tx(struct efx_tx_queue *tx_queue)
519{
520 efx_free_special_buffer(tx_queue->efx, &tx_queue->txd);
521}
522
523/**************************************************************************
524 *
525 * RX path
526 *
527 **************************************************************************/
528
529/* Returns a pointer to the specified descriptor in the RX descriptor queue */
530static inline efx_qword_t *
531efx_rx_desc(struct efx_rx_queue *rx_queue, unsigned int index)
532{
807540ba 533 return ((efx_qword_t *) (rx_queue->rxd.addr)) + index;
8e730c15
BH		 534}
535
536/* This creates an entry in the RX descriptor queue */
537static inline void
538efx_build_rx_desc(struct efx_rx_queue *rx_queue, unsigned index)
539{
540 struct efx_rx_buffer *rx_buf;
541 efx_qword_t *rxd;
542
543 rxd = efx_rx_desc(rx_queue, index);
544 rx_buf = efx_rx_buffer(rx_queue, index);
545 EFX_POPULATE_QWORD_3(*rxd,
546 FSF_AZ_RX_KER_BUF_SIZE,
547 rx_buf->len -
548 rx_queue->efx->type->rx_buffer_padding,
549 FSF_AZ_RX_KER_BUF_REGION, 0,
550 FSF_AZ_RX_KER_BUF_ADDR, rx_buf->dma_addr);
551}
552
553/* This writes to the RX_DESC_WPTR register for the specified receive
554 * descriptor ring.
555 */
556void efx_nic_notify_rx_desc(struct efx_rx_queue *rx_queue)
557{
ecc910f5 558 struct efx_nic *efx = rx_queue->efx;
8e730c15
BH		 559 efx_dword_t reg;
560 unsigned write_ptr;
561
562 while (rx_queue->notified_count != rx_queue->added_count) {
ecc910f5
SH		 563 efx_build_rx_desc(
564 rx_queue,
565 rx_queue->notified_count & rx_queue->ptr_mask);
8e730c15
BH		 566 ++rx_queue->notified_count;
567 }
568
569 wmb();
ecc910f5 570 write_ptr = rx_queue->added_count & rx_queue->ptr_mask;
8e730c15 571 EFX_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr);
ecc910f5 572 efx_writed_page(efx, &reg, FR_AZ_RX_DESC_UPD_DWORD_P0,
ba1e8a35 573 efx_rx_queue_index(rx_queue));
8e730c15
BH		 574}
575
576int efx_nic_probe_rx(struct efx_rx_queue *rx_queue)
577{
578 struct efx_nic *efx = rx_queue->efx;
ecc910f5
SH		 579 unsigned entries;
580
581 entries = rx_queue->ptr_mask + 1;
8e730c15 582 return efx_alloc_special_buffer(efx, &rx_queue->rxd,
ecc910f5 583 entries * sizeof(efx_qword_t));
8e730c15
BH		 584}
585
586void efx_nic_init_rx(struct efx_rx_queue *rx_queue)
587{
588 efx_oword_t rx_desc_ptr;
589 struct efx_nic *efx = rx_queue->efx;
590 bool is_b0 = efx_nic_rev(efx) >= EFX_REV_FALCON_B0;
591 bool iscsi_digest_en = is_b0;
592
62776d03
BH		 593 netif_dbg(efx, hw, efx->net_dev,
594 "RX queue %d ring in special buffers %d-%d\n",
ba1e8a35 595 efx_rx_queue_index(rx_queue), rx_queue->rxd.index,
62776d03 596 rx_queue->rxd.index + rx_queue->rxd.entries - 1);
8e730c15
BH		 597
598 rx_queue->flushed = FLUSH_NONE;
599
600 /* Pin RX descriptor ring */
601 efx_init_special_buffer(efx, &rx_queue->rxd);
602
603 /* Push RX descriptor ring to card */
604 EFX_POPULATE_OWORD_10(rx_desc_ptr,
605 FRF_AZ_RX_ISCSI_DDIG_EN, iscsi_digest_en,
606 FRF_AZ_RX_ISCSI_HDIG_EN, iscsi_digest_en,
607 FRF_AZ_RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index,
608 FRF_AZ_RX_DESCQ_EVQ_ID,
ba1e8a35 609 efx_rx_queue_channel(rx_queue)->channel,
8e730c15 610 FRF_AZ_RX_DESCQ_OWNER_ID, 0,
ba1e8a35
BH		 611 FRF_AZ_RX_DESCQ_LABEL,
612 efx_rx_queue_index(rx_queue),
8e730c15
BH		 613 FRF_AZ_RX_DESCQ_SIZE,
614 __ffs(rx_queue->rxd.entries),
615 FRF_AZ_RX_DESCQ_TYPE, 0 /* kernel queue */ ,
616 /* For >=B0 this is scatter so disable */
617 FRF_AZ_RX_DESCQ_JUMBO, !is_b0,
618 FRF_AZ_RX_DESCQ_EN, 1);
619 efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
ba1e8a35 620 efx_rx_queue_index(rx_queue));
8e730c15
BH		 621}
622
623static void efx_flush_rx_queue(struct efx_rx_queue *rx_queue)
624{
625 struct efx_nic *efx = rx_queue->efx;
626 efx_oword_t rx_flush_descq;
627
628 rx_queue->flushed = FLUSH_PENDING;
629
630 /* Post a flush command */
631 EFX_POPULATE_OWORD_2(rx_flush_descq,
632 FRF_AZ_RX_FLUSH_DESCQ_CMD, 1,
ba1e8a35
BH		 633 FRF_AZ_RX_FLUSH_DESCQ,
634 efx_rx_queue_index(rx_queue));
8e730c15
BH		 635 efx_writeo(efx, &rx_flush_descq, FR_AZ_RX_FLUSH_DESCQ);
636}
637
638void efx_nic_fini_rx(struct efx_rx_queue *rx_queue)
639{
640 efx_oword_t rx_desc_ptr;
641 struct efx_nic *efx = rx_queue->efx;
642
643 /* The queue should already have been flushed */
644 WARN_ON(rx_queue->flushed != FLUSH_DONE);
645
646 /* Remove RX descriptor ring from card */
647 EFX_ZERO_OWORD(rx_desc_ptr);
648 efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
ba1e8a35 649 efx_rx_queue_index(rx_queue));
8e730c15
BH		 650
651 /* Unpin RX descriptor ring */
652 efx_fini_special_buffer(efx, &rx_queue->rxd);
653}
654
655/* Free buffers backing RX queue */
656void efx_nic_remove_rx(struct efx_rx_queue *rx_queue)
657{
658 efx_free_special_buffer(rx_queue->efx, &rx_queue->rxd);
659}
660
661/**************************************************************************
662 *
663 * Event queue processing
664 * Event queues are processed by per-channel tasklets.
665 *
666 **************************************************************************/
667
668/* Update a channel's event queue's read pointer (RPTR) register
669 *
670 * This writes the EVQ_RPTR_REG register for the specified channel's
671 * event queue.
8e730c15
BH		 672 */
673void efx_nic_eventq_read_ack(struct efx_channel *channel)
674{
675 efx_dword_t reg;
676 struct efx_nic *efx = channel->efx;
677
d4fabcc8
BH		 678 EFX_POPULATE_DWORD_1(reg, FRF_AZ_EVQ_RPTR,
679 channel->eventq_read_ptr & channel->eventq_mask);
8e730c15
BH		 680 efx_writed_table(efx, &reg, efx->type->evq_rptr_tbl_base,
681 channel->channel);
682}
683
684/* Use HW to insert a SW defined event */
d215697f 685static void efx_generate_event(struct efx_channel *channel, efx_qword_t *event)
8e730c15
BH		 686{
687 efx_oword_t drv_ev_reg;
688
689 BUILD_BUG_ON(FRF_AZ_DRV_EV_DATA_LBN != 0 ||
690 FRF_AZ_DRV_EV_DATA_WIDTH != 64);
691 drv_ev_reg.u32[0] = event->u32[0];
692 drv_ev_reg.u32[1] = event->u32[1];
693 drv_ev_reg.u32[2] = 0;
694 drv_ev_reg.u32[3] = 0;
695 EFX_SET_OWORD_FIELD(drv_ev_reg, FRF_AZ_DRV_EV_QID, channel->channel);
696 efx_writeo(channel->efx, &drv_ev_reg, FR_AZ_DRV_EV);
697}
698
699/* Handle a transmit completion event
700 *
701 * The NIC batches TX completion events; the message we receive is of
702 * the form "complete all TX events up to this index".
703 */
fa236e18 704static int
8e730c15
BH		 705efx_handle_tx_event(struct efx_channel *channel, efx_qword_t *event)
706{
707 unsigned int tx_ev_desc_ptr;
708 unsigned int tx_ev_q_label;
709 struct efx_tx_queue *tx_queue;
710 struct efx_nic *efx = channel->efx;
fa236e18 711 int tx_packets = 0;
8e730c15
BH		 712
713 if (likely(EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_COMP))) {
714 /* Transmit completion */
715 tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR);
716 tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
f7d12cdc
BH		 717 tx_queue = efx_channel_get_tx_queue(
718 channel, tx_ev_q_label % EFX_TXQ_TYPES);
fa236e18 719 tx_packets = ((tx_ev_desc_ptr - tx_queue->read_count) &
ecc910f5 720 tx_queue->ptr_mask);
fa236e18 721 channel->irq_mod_score += tx_packets;
8e730c15
BH		 722 efx_xmit_done(tx_queue, tx_ev_desc_ptr);
723 } else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) {
724 /* Rewrite the FIFO write pointer */
725 tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
f7d12cdc
BH		 726 tx_queue = efx_channel_get_tx_queue(
727 channel, tx_ev_q_label % EFX_TXQ_TYPES);
8e730c15 728
73ba7b68 729 netif_tx_lock(efx->net_dev);
8e730c15 730 efx_notify_tx_desc(tx_queue);
73ba7b68 731 netif_tx_unlock(efx->net_dev);
8e730c15
BH		 732 } else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_PKT_ERR) &&
733 EFX_WORKAROUND_10727(efx)) {
734 efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
735 } else {
62776d03
BH		 736 netif_err(efx, tx_err, efx->net_dev,
737 "channel %d unexpected TX event "
738 EFX_QWORD_FMT"\n", channel->channel,
739 EFX_QWORD_VAL(*event));
8e730c15 740 }
fa236e18
BH		 741
742 return tx_packets;
8e730c15
BH		 743}
744
745/* Detect errors included in the rx_evt_pkt_ok bit. */
db339569
BH		 746static u16 efx_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
747 const efx_qword_t *event)
8e730c15 748{
ba1e8a35 749 struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
8e730c15
BH		 750 struct efx_nic *efx = rx_queue->efx;
751 bool rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err;
752 bool rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
753 bool rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc;
754 bool rx_ev_other_err, rx_ev_pause_frm;
755 bool rx_ev_hdr_type, rx_ev_mcast_pkt;
756 unsigned rx_ev_pkt_type;
757
758 rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
759 rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
760 rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC);
761 rx_ev_pkt_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_TYPE);
762 rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event,
763 FSF_AZ_RX_EV_BUF_OWNER_ID_ERR);
764 rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event,
765 FSF_AZ_RX_EV_IP_HDR_CHKSUM_ERR);
766 rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event,
767 FSF_AZ_RX_EV_TCP_UDP_CHKSUM_ERR);
768 rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_ETH_CRC_ERR);
769 rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_FRM_TRUNC);
770 rx_ev_drib_nib = ((efx_nic_rev(efx) >= EFX_REV_FALCON_B0) ?
771 0 : EFX_QWORD_FIELD(*event, FSF_AA_RX_EV_DRIB_NIB));
772 rx_ev_pause_frm = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PAUSE_FRM_ERR);
773
774 /* Every error apart from tobe_disc and pause_frm */
775 rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err |
776 rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
777 rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);
778
779 /* Count errors that are not in MAC stats. Ignore expected
780 * checksum errors during self-test. */
781 if (rx_ev_frm_trunc)
ba1e8a35 782 ++channel->n_rx_frm_trunc;
8e730c15 783 else if (rx_ev_tobe_disc)
ba1e8a35 784 ++channel->n_rx_tobe_disc;
8e730c15
BH		 785 else if (!efx->loopback_selftest) {
786 if (rx_ev_ip_hdr_chksum_err)
ba1e8a35 787 ++channel->n_rx_ip_hdr_chksum_err;
8e730c15 788 else if (rx_ev_tcp_udp_chksum_err)
ba1e8a35 789 ++channel->n_rx_tcp_udp_chksum_err;
8e730c15
BH		 790 }
791
8e730c15
BH		 792 /* TOBE_DISC is expected on unicast mismatches; don't print out an
793 * error message. FRM_TRUNC indicates RXDP dropped the packet due
794 * to a FIFO overflow.
795 */
5f3f9d6c 796#ifdef DEBUG
62776d03
BH		 797 if (rx_ev_other_err && net_ratelimit()) {
798 netif_dbg(efx, rx_err, efx->net_dev,
799 " RX queue %d unexpected RX event "
800 EFX_QWORD_FMT "%s%s%s%s%s%s%s%s\n",
ba1e8a35 801 efx_rx_queue_index(rx_queue), EFX_QWORD_VAL(*event),
62776d03
BH		 802 rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "",
803 rx_ev_ip_hdr_chksum_err ?
804 " [IP_HDR_CHKSUM_ERR]" : "",
805 rx_ev_tcp_udp_chksum_err ?
806 " [TCP_UDP_CHKSUM_ERR]" : "",
807 rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "",
808 rx_ev_frm_trunc ? " [FRM_TRUNC]" : "",
809 rx_ev_drib_nib ? " [DRIB_NIB]" : "",
810 rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
811 rx_ev_pause_frm ? " [PAUSE]" : "");
8e730c15
BH		 812 }
813#endif
db339569
BH		 814
815 /* The frame must be discarded if any of these are true. */
816 return (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib |
817 rx_ev_tobe_disc | rx_ev_pause_frm) ?
818 EFX_RX_PKT_DISCARD : 0;
8e730c15
BH		 819}
820
821/* Handle receive events that are not in-order. */
822static void
823efx_handle_rx_bad_index(struct efx_rx_queue *rx_queue, unsigned index)
824{
825 struct efx_nic *efx = rx_queue->efx;
826 unsigned expected, dropped;
827
ecc910f5
SH		 828 expected = rx_queue->removed_count & rx_queue->ptr_mask;
829 dropped = (index - expected) & rx_queue->ptr_mask;
62776d03
BH		 830 netif_info(efx, rx_err, efx->net_dev,
831 "dropped %d events (index=%d expected=%d)\n",
832 dropped, index, expected);
8e730c15
BH		 833
834 efx_schedule_reset(efx, EFX_WORKAROUND_5676(efx) ?
835 RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
836}
837
838/* Handle a packet received event
839 *
840 * The NIC gives a "discard" flag if it's a unicast packet with the
841 * wrong destination address
842 * Also "is multicast" and "matches multicast filter" flags can be used to
843 * discard non-matching multicast packets.
844 */
845static void
846efx_handle_rx_event(struct efx_channel *channel, const efx_qword_t *event)
847{
848 unsigned int rx_ev_desc_ptr, rx_ev_byte_cnt;
849 unsigned int rx_ev_hdr_type, rx_ev_mcast_pkt;
850 unsigned expected_ptr;
db339569
BH		 851 bool rx_ev_pkt_ok;
852 u16 flags;
8e730c15 853 struct efx_rx_queue *rx_queue;
8e730c15
BH		 854
855 /* Basic packet information */
856 rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_BYTE_CNT);
857 rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_OK);
858 rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
859 WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_JUMBO_CONT));
860 WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_SOP) != 1);
861 WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_Q_LABEL) !=
862 channel->channel);
863
f7d12cdc 864 rx_queue = efx_channel_get_rx_queue(channel);
8e730c15
BH		 865
866 rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR);
ecc910f5 867 expected_ptr = rx_queue->removed_count & rx_queue->ptr_mask;
8e730c15
BH		 868 if (unlikely(rx_ev_desc_ptr != expected_ptr))
869 efx_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);
870
871 if (likely(rx_ev_pkt_ok)) {
872 /* If packet is marked as OK and packet type is TCP/IP or
873 * UDP/IP, then we can rely on the hardware checksum.
874 */
db339569
BH		 875 flags = (rx_ev_hdr_type == FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_TCP ||
876 rx_ev_hdr_type == FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_UDP) ?
877 EFX_RX_PKT_CSUMMED : 0;
8e730c15 878 } else {
db339569 879 flags = efx_handle_rx_not_ok(rx_queue, event);
8e730c15
BH		 880 }
881
882 /* Detect multicast packets that didn't match the filter */
883 rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
884 if (rx_ev_mcast_pkt) {
885 unsigned int rx_ev_mcast_hash_match =
886 EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_HASH_MATCH);
887
888 if (unlikely(!rx_ev_mcast_hash_match)) {
889 ++channel->n_rx_mcast_mismatch;
db339569 890 flags |= EFX_RX_PKT_DISCARD;
8e730c15
BH		 891 }
892 }
893
894 channel->irq_mod_score += 2;
895
896 /* Handle received packet */
db339569 897 efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt, flags);
8e730c15
BH		 898}
899
90d683af
SH		 900static void
901efx_handle_generated_event(struct efx_channel *channel, efx_qword_t *event)
902{
903 struct efx_nic *efx = channel->efx;
904 unsigned code;
905
906 code = EFX_QWORD_FIELD(*event, FSF_AZ_DRV_GEN_EV_MAGIC);
907 if (code == EFX_CHANNEL_MAGIC_TEST(channel))
d4fabcc8 908 ; /* ignore */
90d683af
SH		 909 else if (code == EFX_CHANNEL_MAGIC_FILL(channel))
910 /* The queue must be empty, so we won't receive any rx
911 * events, so efx_process_channel() won't refill the
912 * queue. Refill it here */
f7d12cdc 913 efx_fast_push_rx_descriptors(efx_channel_get_rx_queue(channel));
90d683af 914 else
62776d03
BH		 915 netif_dbg(efx, hw, efx->net_dev, "channel %d received "
916 "generated event "EFX_QWORD_FMT"\n",
917 channel->channel, EFX_QWORD_VAL(*event));
90d683af
SH		 918}
919
8e730c15
BH		 920static void
921efx_handle_driver_event(struct efx_channel *channel, efx_qword_t *event)
922{
923 struct efx_nic *efx = channel->efx;
924 unsigned int ev_sub_code;
925 unsigned int ev_sub_data;
926
927 ev_sub_code = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBCODE);
928 ev_sub_data = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);
929
930 switch (ev_sub_code) {
931 case FSE_AZ_TX_DESCQ_FLS_DONE_EV:
62776d03
BH		 932 netif_vdbg(efx, hw, efx->net_dev, "channel %d TXQ %d flushed\n",
933 channel->channel, ev_sub_data);
8e730c15
BH		 934 break;
935 case FSE_AZ_RX_DESCQ_FLS_DONE_EV:
62776d03
BH		 936 netif_vdbg(efx, hw, efx->net_dev, "channel %d RXQ %d flushed\n",
937 channel->channel, ev_sub_data);
8e730c15
BH		 938 break;
939 case FSE_AZ_EVQ_INIT_DONE_EV:
62776d03
BH		 940 netif_dbg(efx, hw, efx->net_dev,
941 "channel %d EVQ %d initialised\n",
942 channel->channel, ev_sub_data);
8e730c15
BH		 943 break;
944 case FSE_AZ_SRM_UPD_DONE_EV:
62776d03
BH		 945 netif_vdbg(efx, hw, efx->net_dev,
946 "channel %d SRAM update done\n", channel->channel);
8e730c15
BH		 947 break;
948 case FSE_AZ_WAKE_UP_EV:
62776d03
BH		 949 netif_vdbg(efx, hw, efx->net_dev,
950 "channel %d RXQ %d wakeup event\n",
951 channel->channel, ev_sub_data);
8e730c15
BH		 952 break;
953 case FSE_AZ_TIMER_EV:
62776d03
BH		 954 netif_vdbg(efx, hw, efx->net_dev,
955 "channel %d RX queue %d timer expired\n",
956 channel->channel, ev_sub_data);
8e730c15
BH		 957 break;
958 case FSE_AA_RX_RECOVER_EV:
62776d03
BH		 959 netif_err(efx, rx_err, efx->net_dev,
960 "channel %d seen DRIVER RX_RESET event. "
8e730c15
BH		 961 "Resetting.\n", channel->channel);
962 atomic_inc(&efx->rx_reset);
963 efx_schedule_reset(efx,
964 EFX_WORKAROUND_6555(efx) ?
965 RESET_TYPE_RX_RECOVERY :
966 RESET_TYPE_DISABLE);
967 break;
968 case FSE_BZ_RX_DSC_ERROR_EV:
62776d03
BH		 969 netif_err(efx, rx_err, efx->net_dev,
970 "RX DMA Q %d reports descriptor fetch error."
971 " RX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
8e730c15
BH		 972 efx_schedule_reset(efx, RESET_TYPE_RX_DESC_FETCH);
973 break;
974 case FSE_BZ_TX_DSC_ERROR_EV:
62776d03
BH		 975 netif_err(efx, tx_err, efx->net_dev,
976 "TX DMA Q %d reports descriptor fetch error."
977 " TX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
8e730c15
BH		 978 efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
979 break;
980 default:
62776d03
BH		 981 netif_vdbg(efx, hw, efx->net_dev,
982 "channel %d unknown driver event code %d "
983 "data %04x\n", channel->channel, ev_sub_code,
984 ev_sub_data);
8e730c15
BH		 985 break;
986 }
987}
988
fa236e18 989int efx_nic_process_eventq(struct efx_channel *channel, int budget)
8e730c15 990{
ecc910f5 991 struct efx_nic *efx = channel->efx;
8e730c15
BH		 992 unsigned int read_ptr;
993 efx_qword_t event, *p_event;
994 int ev_code;
fa236e18
BH		 995 int tx_packets = 0;
996 int spent = 0;
8e730c15
BH		 997
998 read_ptr = channel->eventq_read_ptr;
999
fa236e18 1000 for (;;) {
8e730c15
BH		 1001 p_event = efx_event(channel, read_ptr);
1002 event = *p_event;
1003
1004 if (!efx_event_present(&event))
1005 /* End of events */
1006 break;
1007
62776d03
BH		 1008 netif_vdbg(channel->efx, intr, channel->efx->net_dev,
1009 "channel %d event is "EFX_QWORD_FMT"\n",
1010 channel->channel, EFX_QWORD_VAL(event));
8e730c15
BH		 1011
1012 /* Clear this event by marking it all ones */
1013 EFX_SET_QWORD(*p_event);
1014
d4fabcc8 1015 ++read_ptr;
fa236e18 1016
8e730c15
BH		 1017 ev_code = EFX_QWORD_FIELD(event, FSF_AZ_EV_CODE);
1018
1019 switch (ev_code) {
1020 case FSE_AZ_EV_CODE_RX_EV:
1021 efx_handle_rx_event(channel, &event);
fa236e18
BH		 1022 if (++spent == budget)
1023 goto out;
8e730c15
BH		 1024 break;
1025 case FSE_AZ_EV_CODE_TX_EV:
fa236e18 1026 tx_packets += efx_handle_tx_event(channel, &event);
ecc910f5 1027 if (tx_packets > efx->txq_entries) {
fa236e18
BH		 1028 spent = budget;
1029 goto out;
1030 }
8e730c15
BH		 1031 break;
1032 case FSE_AZ_EV_CODE_DRV_GEN_EV:
90d683af 1033 efx_handle_generated_event(channel, &event);
8e730c15 1034 break;
8e730c15
BH		 1035 case FSE_AZ_EV_CODE_DRIVER_EV:
1036 efx_handle_driver_event(channel, &event);
1037 break;
8880f4ec
BH		 1038 case FSE_CZ_EV_CODE_MCDI_EV:
1039 efx_mcdi_process_event(channel, &event);
1040 break;
40641ed9
BH		 1041 case FSE_AZ_EV_CODE_GLOBAL_EV:
1042 if (efx->type->handle_global_event &&
1043 efx->type->handle_global_event(channel, &event))
1044 break;
1045 /* else fall through */
8e730c15 1046 default:
62776d03
BH		 1047 netif_err(channel->efx, hw, channel->efx->net_dev,
1048 "channel %d unknown event type %d (data "
1049 EFX_QWORD_FMT ")\n", channel->channel,
1050 ev_code, EFX_QWORD_VAL(event));
8e730c15 1051 }
fa236e18 1052 }
8e730c15 1053
fa236e18 1054out:
8e730c15 1055 channel->eventq_read_ptr = read_ptr;
fa236e18 1056 return spent;
8e730c15
BH		 1057}
1058
d4fabcc8
BH		 1059/* Check whether an event is present in the eventq at the current
1060 * read pointer. Only useful for self-test.
1061 */
1062bool efx_nic_event_present(struct efx_channel *channel)
1063{
1064 return efx_event_present(efx_event(channel, channel->eventq_read_ptr));
1065}
8e730c15
BH		 1066
1067/* Allocate buffer table entries for event queue */
1068int efx_nic_probe_eventq(struct efx_channel *channel)
1069{
1070 struct efx_nic *efx = channel->efx;
ecc910f5
SH		 1071 unsigned entries;
1072
1073 entries = channel->eventq_mask + 1;
8e730c15 1074 return efx_alloc_special_buffer(efx, &channel->eventq,
ecc910f5 1075 entries * sizeof(efx_qword_t));
8e730c15
BH		 1076}
1077
1078void efx_nic_init_eventq(struct efx_channel *channel)
1079{
8880f4ec 1080 efx_oword_t reg;
8e730c15
BH		 1081 struct efx_nic *efx = channel->efx;
1082
62776d03
BH		 1083 netif_dbg(efx, hw, efx->net_dev,
1084 "channel %d event queue in special buffers %d-%d\n",
1085 channel->channel, channel->eventq.index,
1086 channel->eventq.index + channel->eventq.entries - 1);
8e730c15 1087
8880f4ec
BH		 1088 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0) {
1089 EFX_POPULATE_OWORD_3(reg,
1090 FRF_CZ_TIMER_Q_EN, 1,
1091 FRF_CZ_HOST_NOTIFY_MODE, 0,
1092 FRF_CZ_TIMER_MODE, FFE_CZ_TIMER_MODE_DIS);
1093 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL, channel->channel);
1094 }
1095
8e730c15
BH		 1096 /* Pin event queue buffer */
1097 efx_init_special_buffer(efx, &channel->eventq);
1098
1099 /* Fill event queue with all ones (i.e. empty events) */
1100 memset(channel->eventq.addr, 0xff, channel->eventq.len);
1101
1102 /* Push event queue to card */
8880f4ec 1103 EFX_POPULATE_OWORD_3(reg,
8e730c15
BH		 1104 FRF_AZ_EVQ_EN, 1,
1105 FRF_AZ_EVQ_SIZE, __ffs(channel->eventq.entries),
1106 FRF_AZ_EVQ_BUF_BASE_ID, channel->eventq.index);
8880f4ec 1107 efx_writeo_table(efx, &reg, efx->type->evq_ptr_tbl_base,
8e730c15
BH		 1108 channel->channel);
1109
1110 efx->type->push_irq_moderation(channel);
1111}
1112
1113void efx_nic_fini_eventq(struct efx_channel *channel)
1114{
8880f4ec 1115 efx_oword_t reg;
8e730c15
BH		 1116 struct efx_nic *efx = channel->efx;
1117
1118 /* Remove event queue from card */
8880f4ec
BH		 1119 EFX_ZERO_OWORD(reg);
1120 efx_writeo_table(efx, &reg, efx->type->evq_ptr_tbl_base,
8e730c15 1121 channel->channel);
8880f4ec
BH		 1122 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0)
1123 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL, channel->channel);
8e730c15
BH		 1124
1125 /* Unpin event queue */
1126 efx_fini_special_buffer(efx, &channel->eventq);
1127}
1128
1129/* Free buffers backing event queue */
1130void efx_nic_remove_eventq(struct efx_channel *channel)
1131{
1132 efx_free_special_buffer(channel->efx, &channel->eventq);
1133}
1134
1135
d730dc52 1136void efx_nic_generate_test_event(struct efx_channel *channel)
8e730c15 1137{
90d683af
SH		 1138 unsigned int magic = EFX_CHANNEL_MAGIC_TEST(channel);
1139 efx_qword_t test_event;
1140
1141 EFX_POPULATE_QWORD_2(test_event, FSF_AZ_EV_CODE,
1142 FSE_AZ_EV_CODE_DRV_GEN_EV,
1143 FSF_AZ_DRV_GEN_EV_MAGIC, magic);
1144 efx_generate_event(channel, &test_event);
1145}
1146
1147void efx_nic_generate_fill_event(struct efx_channel *channel)
1148{
1149 unsigned int magic = EFX_CHANNEL_MAGIC_FILL(channel);
8e730c15
BH		 1150 efx_qword_t test_event;
1151
1152 EFX_POPULATE_QWORD_2(test_event, FSF_AZ_EV_CODE,
1153 FSE_AZ_EV_CODE_DRV_GEN_EV,
1154 FSF_AZ_DRV_GEN_EV_MAGIC, magic);
1155 efx_generate_event(channel, &test_event);
1156}
1157
1158/**************************************************************************
1159 *
1160 * Flush handling
1161 *
1162 **************************************************************************/
1163
1164
1165static void efx_poll_flush_events(struct efx_nic *efx)
1166{
f7d12cdc 1167 struct efx_channel *channel = efx_get_channel(efx, 0);
8e730c15
BH		 1168 struct efx_tx_queue *tx_queue;
1169 struct efx_rx_queue *rx_queue;
1170 unsigned int read_ptr = channel->eventq_read_ptr;
d4fabcc8 1171 unsigned int end_ptr = read_ptr + channel->eventq_mask - 1;
8e730c15
BH		 1172
1173 do {
1174 efx_qword_t *event = efx_event(channel, read_ptr);
1175 int ev_code, ev_sub_code, ev_queue;
1176 bool ev_failed;
1177
1178 if (!efx_event_present(event))
1179 break;
1180
1181 ev_code = EFX_QWORD_FIELD(*event, FSF_AZ_EV_CODE);
1182 ev_sub_code = EFX_QWORD_FIELD(*event,
1183 FSF_AZ_DRIVER_EV_SUBCODE);
1184 if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV &&
1185 ev_sub_code == FSE_AZ_TX_DESCQ_FLS_DONE_EV) {
1186 ev_queue = EFX_QWORD_FIELD(*event,
1187 FSF_AZ_DRIVER_EV_SUBDATA);
a4900ac9 1188 if (ev_queue < EFX_TXQ_TYPES * efx->n_tx_channels) {
f7d12cdc
BH		 1189 tx_queue = efx_get_tx_queue(
1190 efx, ev_queue / EFX_TXQ_TYPES,
1191 ev_queue % EFX_TXQ_TYPES);
8e730c15
BH		 1192 tx_queue->flushed = FLUSH_DONE;
1193 }
1194 } else if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV &&
1195 ev_sub_code == FSE_AZ_RX_DESCQ_FLS_DONE_EV) {
1196 ev_queue = EFX_QWORD_FIELD(
1197 *event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID);
1198 ev_failed = EFX_QWORD_FIELD(
1199 *event, FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL);
a4900ac9 1200 if (ev_queue < efx->n_rx_channels) {
f7d12cdc 1201 rx_queue = efx_get_rx_queue(efx, ev_queue);
8e730c15
BH		 1202 rx_queue->flushed =
1203 ev_failed ? FLUSH_FAILED : FLUSH_DONE;
1204 }
1205 }
1206
1207 /* We're about to destroy the queue anyway, so
1208 * it's ok to throw away every non-flush event */
1209 EFX_SET_QWORD(*event);
1210
d4fabcc8 1211 ++read_ptr;
8e730c15
BH		 1212 } while (read_ptr != end_ptr);
1213
1214 channel->eventq_read_ptr = read_ptr;
1215}
1216
1217/* Handle tx and rx flushes at the same time, since they run in
1218 * parallel in the hardware and there's no reason for us to
1219 * serialise them */
1220int efx_nic_flush_queues(struct efx_nic *efx)
1221{
f7d12cdc 1222 struct efx_channel *channel;
8e730c15
BH		 1223 struct efx_rx_queue *rx_queue;
1224 struct efx_tx_queue *tx_queue;
1225 int i, tx_pending, rx_pending;
1226
1227 /* If necessary prepare the hardware for flushing */
1228 efx->type->prepare_flush(efx);
1229
1230 /* Flush all tx queues in parallel */
f7d12cdc 1231 efx_for_each_channel(channel, efx) {
94b274bf
BH		 1232 efx_for_each_possible_channel_tx_queue(tx_queue, channel) {
1233 if (tx_queue->initialised)
1234 efx_flush_tx_queue(tx_queue);
1235 }
f7d12cdc 1236 }
8e730c15
BH		 1237
1238 /* The hardware supports four concurrent rx flushes, each of which may
1239 * need to be retried if there is an outstanding descriptor fetch */
1240 for (i = 0; i < EFX_FLUSH_POLL_COUNT; ++i) {
1241 rx_pending = tx_pending = 0;
f7d12cdc
BH		 1242 efx_for_each_channel(channel, efx) {
1243 efx_for_each_channel_rx_queue(rx_queue, channel) {
1244 if (rx_queue->flushed == FLUSH_PENDING)
1245 ++rx_pending;
8e730c15
BH		 1246 }
1247 }
f7d12cdc
BH		 1248 efx_for_each_channel(channel, efx) {
1249 efx_for_each_channel_rx_queue(rx_queue, channel) {
1250 if (rx_pending == EFX_RX_FLUSH_COUNT)
1251 break;
1252 if (rx_queue->flushed == FLUSH_FAILED ||
1253 rx_queue->flushed == FLUSH_NONE) {
1254 efx_flush_rx_queue(rx_queue);
1255 ++rx_pending;
1256 }
1257 }
94b274bf
BH		 1258 efx_for_each_possible_channel_tx_queue(tx_queue, channel) {
1259 if (tx_queue->initialised &&
1260 tx_queue->flushed != FLUSH_DONE)
f7d12cdc
BH		 1261 ++tx_pending;
1262 }
8e730c15
BH		 1263 }
1264
1265 if (rx_pending == 0 && tx_pending == 0)
1266 return 0;
1267
1268 msleep(EFX_FLUSH_INTERVAL);
1269 efx_poll_flush_events(efx);
1270 }
1271
1272 /* Mark the queues as all flushed. We're going to return failure
1273 * leading to a reset, or fake up success anyway */
f7d12cdc 1274 efx_for_each_channel(channel, efx) {
94b274bf
BH		 1275 efx_for_each_possible_channel_tx_queue(tx_queue, channel) {
1276 if (tx_queue->initialised &&
1277 tx_queue->flushed != FLUSH_DONE)
f7d12cdc
BH		 1278 netif_err(efx, hw, efx->net_dev,
1279 "tx queue %d flush command timed out\n",
1280 tx_queue->queue);
1281 tx_queue->flushed = FLUSH_DONE;
1282 }
1283 efx_for_each_channel_rx_queue(rx_queue, channel) {
1284 if (rx_queue->flushed != FLUSH_DONE)
1285 netif_err(efx, hw, efx->net_dev,
1286 "rx queue %d flush command timed out\n",
1287 efx_rx_queue_index(rx_queue));
1288 rx_queue->flushed = FLUSH_DONE;
1289 }
8e730c15
BH		 1290 }
1291
8e730c15
BH		 1292 return -ETIMEDOUT;
1293}
1294
1295/**************************************************************************
1296 *
1297 * Hardware interrupts
1298 * The hardware interrupt handler does very little work; all the event
1299 * queue processing is carried out by per-channel tasklets.
1300 *
1301 **************************************************************************/
1302
1303/* Enable/disable/generate interrupts */
1304static inline void efx_nic_interrupts(struct efx_nic *efx,
1305 bool enabled, bool force)
1306{
1307 efx_oword_t int_en_reg_ker;
8880f4ec
BH		 1308
1309 EFX_POPULATE_OWORD_3(int_en_reg_ker,
1646a6f3 1310 FRF_AZ_KER_INT_LEVE_SEL, efx->irq_level,
8e730c15
BH		 1311 FRF_AZ_KER_INT_KER, force,
1312 FRF_AZ_DRV_INT_EN_KER, enabled);
1313 efx_writeo(efx, &int_en_reg_ker, FR_AZ_INT_EN_KER);
1314}
1315
1316void efx_nic_enable_interrupts(struct efx_nic *efx)
1317{
1318 struct efx_channel *channel;
1319
1320 EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr));
1321 wmb(); /* Ensure interrupt vector is clear before interrupts enabled */
1322
1323 /* Enable interrupts */
1324 efx_nic_interrupts(efx, true, false);
1325
1326 /* Force processing of all the channels to get the EVQ RPTRs up to
1327 date */
1328 efx_for_each_channel(channel, efx)
1329 efx_schedule_channel(channel);
1330}
1331
1332void efx_nic_disable_interrupts(struct efx_nic *efx)
1333{
1334 /* Disable interrupts */
1335 efx_nic_interrupts(efx, false, false);
1336}
1337
1338/* Generate a test interrupt
1339 * Interrupt must already have been enabled, otherwise nasty things
1340 * may happen.
1341 */
1342void efx_nic_generate_interrupt(struct efx_nic *efx)
1343{
1344 efx_nic_interrupts(efx, true, true);
1345}
1346
1347/* Process a fatal interrupt
1348 * Disable bus mastering ASAP and schedule a reset
1349 */
1350irqreturn_t efx_nic_fatal_interrupt(struct efx_nic *efx)
1351{
1352 struct falcon_nic_data *nic_data = efx->nic_data;
1353 efx_oword_t *int_ker = efx->irq_status.addr;
1354 efx_oword_t fatal_intr;
1355 int error, mem_perr;
1356
1357 efx_reado(efx, &fatal_intr, FR_AZ_FATAL_INTR_KER);
1358 error = EFX_OWORD_FIELD(fatal_intr, FRF_AZ_FATAL_INTR);
1359
62776d03
BH		 1360 netif_err(efx, hw, efx->net_dev, "SYSTEM ERROR "EFX_OWORD_FMT" status "
1361 EFX_OWORD_FMT ": %s\n", EFX_OWORD_VAL(*int_ker),
1362 EFX_OWORD_VAL(fatal_intr),
1363 error ? "disabling bus mastering" : "no recognised error");
8e730c15
BH		 1364
1365 /* If this is a memory parity error dump which blocks are offending */
97e1eaa0
SH		 1366 mem_perr = (EFX_OWORD_FIELD(fatal_intr, FRF_AZ_MEM_PERR_INT_KER) ||
1367 EFX_OWORD_FIELD(fatal_intr, FRF_AZ_SRM_PERR_INT_KER));
8e730c15
BH		 1368 if (mem_perr) {
1369 efx_oword_t reg;
1370 efx_reado(efx, &reg, FR_AZ_MEM_STAT);
62776d03
BH		 1371 netif_err(efx, hw, efx->net_dev,
1372 "SYSTEM ERROR: memory parity error "EFX_OWORD_FMT"\n",
1373 EFX_OWORD_VAL(reg));
8e730c15
BH		 1374 }
1375
1376 /* Disable both devices */
1377 pci_clear_master(efx->pci_dev);
1378 if (efx_nic_is_dual_func(efx))
1379 pci_clear_master(nic_data->pci_dev2);
1380 efx_nic_disable_interrupts(efx);
1381
1382 /* Count errors and reset or disable the NIC accordingly */
1383 if (efx->int_error_count == 0 ||
1384 time_after(jiffies, efx->int_error_expire)) {
1385 efx->int_error_count = 0;
1386 efx->int_error_expire =
1387 jiffies + EFX_INT_ERROR_EXPIRE * HZ;
1388 }
1389 if (++efx->int_error_count < EFX_MAX_INT_ERRORS) {
62776d03
BH		 1390 netif_err(efx, hw, efx->net_dev,
1391 "SYSTEM ERROR - reset scheduled\n");
8e730c15
BH		 1392 efx_schedule_reset(efx, RESET_TYPE_INT_ERROR);
1393 } else {
62776d03
BH		 1394 netif_err(efx, hw, efx->net_dev,
1395 "SYSTEM ERROR - max number of errors seen."
1396 "NIC will be disabled\n");
8e730c15
BH		 1397 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
1398 }
63695459 1399
8e730c15
BH		 1400 return IRQ_HANDLED;
1401}
1402
1403/* Handle a legacy interrupt
1404 * Acknowledges the interrupt and schedule event queue processing.
1405 */
1406static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id)
1407{
1408 struct efx_nic *efx = dev_id;
1409 efx_oword_t *int_ker = efx->irq_status.addr;
1410 irqreturn_t result = IRQ_NONE;
1411 struct efx_channel *channel;
1412 efx_dword_t reg;
1413 u32 queues;
1414 int syserr;
1415
94dec6a2
BH		 1416 /* Could this be ours? If interrupts are disabled then the
1417 * channel state may not be valid.
1418 */
1419 if (!efx->legacy_irq_enabled)
1420 return result;
1421
8e730c15
BH		 1422 /* Read the ISR which also ACKs the interrupts */
1423 efx_readd(efx, &reg, FR_BZ_INT_ISR0);
1424 queues = EFX_EXTRACT_DWORD(reg, 0, 31);
1425
1646a6f3
BH		 1426 /* Handle non-event-queue sources */
1427 if (queues & (1U << efx->irq_level)) {
63695459
SH		 1428 syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
1429 if (unlikely(syserr))
1430 return efx_nic_fatal_interrupt(efx);
1646a6f3 1431 efx->last_irq_cpu = raw_smp_processor_id();
63695459 1432 }
8e730c15 1433
8880f4ec
BH		 1434 if (queues != 0) {
1435 if (EFX_WORKAROUND_15783(efx))
1436 efx->irq_zero_count = 0;
1437
1438 /* Schedule processing of any interrupting queues */
1439 efx_for_each_channel(channel, efx) {
1440 if (queues & 1)
1646a6f3 1441 efx_schedule_channel_irq(channel);
8880f4ec 1442 queues >>= 1;
8e730c15 1443 }
8880f4ec
BH		 1444 result = IRQ_HANDLED;
1445
41b7e4c3 1446 } else if (EFX_WORKAROUND_15783(efx)) {
8880f4ec
BH		 1447 efx_qword_t *event;
1448
41b7e4c3
SH		 1449 /* We can't return IRQ_HANDLED more than once on seeing ISR=0
1450 * because this might be a shared interrupt. */
1451 if (efx->irq_zero_count++ == 0)
1452 result = IRQ_HANDLED;
1453
1454 /* Ensure we schedule or rearm all event queues */
8880f4ec
BH		 1455 efx_for_each_channel(channel, efx) {
1456 event = efx_event(channel, channel->eventq_read_ptr);
1457 if (efx_event_present(event))
1646a6f3 1458 efx_schedule_channel_irq(channel);
41b7e4c3
SH		 1459 else
1460 efx_nic_eventq_read_ack(channel);
8880f4ec 1461 }
8e730c15
BH		 1462 }
1463
1646a6f3 1464 if (result == IRQ_HANDLED)
62776d03
BH		 1465 netif_vdbg(efx, intr, efx->net_dev,
1466 "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
1467 irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
8e730c15
BH		 1468
1469 return result;
1470}
1471
1472/* Handle an MSI interrupt
1473 *
1474 * Handle an MSI hardware interrupt. This routine schedules event
1475 * queue processing. No interrupt acknowledgement cycle is necessary.
1476 * Also, we never need to check that the interrupt is for us, since
1477 * MSI interrupts cannot be shared.
1478 */
1479static irqreturn_t efx_msi_interrupt(int irq, void *dev_id)
1480{
4642610c 1481 struct efx_channel *channel = *(struct efx_channel **)dev_id;
8e730c15
BH		 1482 struct efx_nic *efx = channel->efx;
1483 efx_oword_t *int_ker = efx->irq_status.addr;
1484 int syserr;
1485
62776d03
BH		 1486 netif_vdbg(efx, intr, efx->net_dev,
1487 "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
1488 irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
8e730c15 1489
1646a6f3
BH		 1490 /* Handle non-event-queue sources */
1491 if (channel->channel == efx->irq_level) {
63695459
SH		 1492 syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
1493 if (unlikely(syserr))
1494 return efx_nic_fatal_interrupt(efx);
1646a6f3 1495 efx->last_irq_cpu = raw_smp_processor_id();
63695459 1496 }
8e730c15
BH		 1497
1498 /* Schedule processing of the channel */
1646a6f3 1499 efx_schedule_channel_irq(channel);
8e730c15
BH		 1500
1501 return IRQ_HANDLED;
1502}
1503
1504
1505/* Setup RSS indirection table.
1506 * This maps from the hash value of the packet to RXQ
1507 */
765c9f46 1508void efx_nic_push_rx_indir_table(struct efx_nic *efx)
8e730c15 1509{
765c9f46 1510 size_t i = 0;
8e730c15
BH		 1511 efx_dword_t dword;
1512
1513 if (efx_nic_rev(efx) < EFX_REV_FALCON_B0)
1514 return;
1515
765c9f46
BH		 1516 BUILD_BUG_ON(ARRAY_SIZE(efx->rx_indir_table) !=
1517 FR_BZ_RX_INDIRECTION_TBL_ROWS);
1518
1519 for (i = 0; i < FR_BZ_RX_INDIRECTION_TBL_ROWS; i++) {
8e730c15 1520 EFX_POPULATE_DWORD_1(dword, FRF_BZ_IT_QUEUE,
765c9f46
BH		 1521 efx->rx_indir_table[i]);
1522 efx_writed_table(efx, &dword, FR_BZ_RX_INDIRECTION_TBL, i);
8e730c15
BH		 1523 }
1524}
1525
1526/* Hook interrupt handler(s)
1527 * Try MSI and then legacy interrupts.
1528 */
1529int efx_nic_init_interrupt(struct efx_nic *efx)
1530{
1531 struct efx_channel *channel;
1532 int rc;
1533
1534 if (!EFX_INT_MODE_USE_MSI(efx)) {
1535 irq_handler_t handler;
1536 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
1537 handler = efx_legacy_interrupt;
1538 else
1539 handler = falcon_legacy_interrupt_a1;
1540
1541 rc = request_irq(efx->legacy_irq, handler, IRQF_SHARED,
1542 efx->name, efx);
1543 if (rc) {
62776d03
BH		 1544 netif_err(efx, drv, efx->net_dev,
1545 "failed to hook legacy IRQ %d\n",
1546 efx->pci_dev->irq);
8e730c15
BH		 1547 goto fail1;
1548 }
1549 return 0;
1550 }
1551
1552 /* Hook MSI or MSI-X interrupt */
1553 efx_for_each_channel(channel, efx) {
1554 rc = request_irq(channel->irq, efx_msi_interrupt,
1555 IRQF_PROBE_SHARED, /* Not shared */
4642610c
BH		 1556 efx->channel_name[channel->channel],
1557 &efx->channel[channel->channel]);
8e730c15 1558 if (rc) {
62776d03
BH		 1559 netif_err(efx, drv, efx->net_dev,
1560 "failed to hook IRQ %d\n", channel->irq);
8e730c15
BH		 1561 goto fail2;
1562 }
1563 }
1564
1565 return 0;
1566
1567 fail2:
1568 efx_for_each_channel(channel, efx)
4642610c 1569 free_irq(channel->irq, &efx->channel[channel->channel]);
8e730c15
BH		 1570 fail1:
1571 return rc;
1572}
1573
1574void efx_nic_fini_interrupt(struct efx_nic *efx)
1575{
1576 struct efx_channel *channel;
1577 efx_oword_t reg;
1578
1579 /* Disable MSI/MSI-X interrupts */
1580 efx_for_each_channel(channel, efx) {
1581 if (channel->irq)
4642610c 1582 free_irq(channel->irq, &efx->channel[channel->channel]);
8e730c15
BH		 1583 }
1584
1585 /* ACK legacy interrupt */
1586 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
1587 efx_reado(efx, &reg, FR_BZ_INT_ISR0);
1588 else
1589 falcon_irq_ack_a1(efx);
1590
1591 /* Disable legacy interrupt */
1592 if (efx->legacy_irq)
1593 free_irq(efx->legacy_irq, efx);
1594}
1595
1596u32 efx_nic_fpga_ver(struct efx_nic *efx)
1597{
1598 efx_oword_t altera_build;
1599 efx_reado(efx, &altera_build, FR_AZ_ALTERA_BUILD);
1600 return EFX_OWORD_FIELD(altera_build, FRF_AZ_ALTERA_BUILD_VER);
1601}
1602
1603void efx_nic_init_common(struct efx_nic *efx)
1604{
1605 efx_oword_t temp;
1606
1607 /* Set positions of descriptor caches in SRAM. */
1608 EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_TX_DC_BASE_ADR,
1609 efx->type->tx_dc_base / 8);
1610 efx_writeo(efx, &temp, FR_AZ_SRM_TX_DC_CFG);
1611 EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_RX_DC_BASE_ADR,
1612 efx->type->rx_dc_base / 8);
1613 efx_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG);
1614
1615 /* Set TX descriptor cache size. */
1616 BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER));
1617 EFX_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
1618 efx_writeo(efx, &temp, FR_AZ_TX_DC_CFG);
1619
1620 /* Set RX descriptor cache size. Set low watermark to size-8, as
1621 * this allows most efficient prefetching.
1622 */
1623 BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER));
1624 EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
1625 efx_writeo(efx, &temp, FR_AZ_RX_DC_CFG);
1626 EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8);
1627 efx_writeo(efx, &temp, FR_AZ_RX_DC_PF_WM);
1628
1629 /* Program INT_KER address */
1630 EFX_POPULATE_OWORD_2(temp,
1631 FRF_AZ_NORM_INT_VEC_DIS_KER,
1632 EFX_INT_MODE_USE_MSI(efx),
1633 FRF_AZ_INT_ADR_KER, efx->irq_status.dma_addr);
1634 efx_writeo(efx, &temp, FR_AZ_INT_ADR_KER);
1635
63695459
SH		 1636 if (EFX_WORKAROUND_17213(efx) && !EFX_INT_MODE_USE_MSI(efx))
1637 /* Use an interrupt level unused by event queues */
1646a6f3 1638 efx->irq_level = 0x1f;
63695459
SH		 1639 else
1640 /* Use a valid MSI-X vector */
1646a6f3 1641 efx->irq_level = 0;
63695459 1642
8e730c15
BH		 1643 /* Enable all the genuinely fatal interrupts. (They are still
1644 * masked by the overall interrupt mask, controlled by
1645 * falcon_interrupts()).
1646 *
1647 * Note: All other fatal interrupts are enabled
1648 */
1649 EFX_POPULATE_OWORD_3(temp,
1650 FRF_AZ_ILL_ADR_INT_KER_EN, 1,
1651 FRF_AZ_RBUF_OWN_INT_KER_EN, 1,
1652 FRF_AZ_TBUF_OWN_INT_KER_EN, 1);
b17424b0
SH		 1653 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0)
1654 EFX_SET_OWORD_FIELD(temp, FRF_CZ_SRAM_PERR_INT_P_KER_EN, 1);
8e730c15
BH		 1655 EFX_INVERT_OWORD(temp);
1656 efx_writeo(efx, &temp, FR_AZ_FATAL_INTR_KER);
1657
765c9f46 1658 efx_nic_push_rx_indir_table(efx);
8e730c15
BH		 1659
1660 /* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be
1661 * controlled by the RX FIFO fill level. Set arbitration to one pkt/Q.
1662 */
1663 efx_reado(efx, &temp, FR_AZ_TX_RESERVED);
1664 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER, 0xfe);
1665 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER_EN, 1);
1666 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_ONE_PKT_PER_Q, 1);
cd38557d 1667 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PUSH_EN, 1);
8e730c15
BH		 1668 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_DIS_NON_IP_EV, 1);
1669 /* Enable SW_EV to inherit in char driver - assume harmless here */
1670 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1);
1671 /* Prefetch threshold 2 => fetch when descriptor cache half empty */
1672 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2);
286d47ba
BH		 1673 /* Disable hardware watchdog which can misfire */
1674 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_WD_TMR, 0x3fffff);
8e730c15
BH		 1675 /* Squash TX of packets of 16 bytes or less */
1676 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
1677 EFX_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1);
1678 efx_writeo(efx, &temp, FR_AZ_TX_RESERVED);
94b274bf
BH		 1679
1680 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) {
1681 EFX_POPULATE_OWORD_4(temp,
1682 /* Default values */
1683 FRF_BZ_TX_PACE_SB_NOT_AF, 0x15,
1684 FRF_BZ_TX_PACE_SB_AF, 0xb,
1685 FRF_BZ_TX_PACE_FB_BASE, 0,
1686 /* Allow large pace values in the
1687 * fast bin. */
1688 FRF_BZ_TX_PACE_BIN_TH,
1689 FFE_BZ_TX_PACE_RESERVED);
1690 efx_writeo(efx, &temp, FR_BZ_TX_PACE);
1691 }
8e730c15 1692}
5b98c1bf
BH		 1693
1694/* Register dump */
1695
1696#define REGISTER_REVISION_A 1
1697#define REGISTER_REVISION_B 2
1698#define REGISTER_REVISION_C 3
1699#define REGISTER_REVISION_Z 3 /* latest revision */
1700
1701struct efx_nic_reg {
1702 u32 offset:24;
1703 u32 min_revision:2, max_revision:2;
1704};
1705
1706#define REGISTER(name, min_rev, max_rev) { \
1707 FR_ ## min_rev ## max_rev ## _ ## name, \
1708 REGISTER_REVISION_ ## min_rev, REGISTER_REVISION_ ## max_rev \
1709}
1710#define REGISTER_AA(name) REGISTER(name, A, A)
1711#define REGISTER_AB(name) REGISTER(name, A, B)
1712#define REGISTER_AZ(name) REGISTER(name, A, Z)
1713#define REGISTER_BB(name) REGISTER(name, B, B)
1714#define REGISTER_BZ(name) REGISTER(name, B, Z)
1715#define REGISTER_CZ(name) REGISTER(name, C, Z)
1716
1717static const struct efx_nic_reg efx_nic_regs[] = {
1718 REGISTER_AZ(ADR_REGION),
1719 REGISTER_AZ(INT_EN_KER),
1720 REGISTER_BZ(INT_EN_CHAR),
1721 REGISTER_AZ(INT_ADR_KER),
1722 REGISTER_BZ(INT_ADR_CHAR),
1723 /* INT_ACK_KER is WO */
1724 /* INT_ISR0 is RC */
1725 REGISTER_AZ(HW_INIT),
1726 REGISTER_CZ(USR_EV_CFG),
1727 REGISTER_AB(EE_SPI_HCMD),
1728 REGISTER_AB(EE_SPI_HADR),
1729 REGISTER_AB(EE_SPI_HDATA),
1730 REGISTER_AB(EE_BASE_PAGE),
1731 REGISTER_AB(EE_VPD_CFG0),
1732 /* EE_VPD_SW_CNTL and EE_VPD_SW_DATA are not used */
1733 /* PMBX_DBG_IADDR and PBMX_DBG_IDATA are indirect */
1734 /* PCIE_CORE_INDIRECT is indirect */
1735 REGISTER_AB(NIC_STAT),
1736 REGISTER_AB(GPIO_CTL),
1737 REGISTER_AB(GLB_CTL),
1738 /* FATAL_INTR_KER and FATAL_INTR_CHAR are partly RC */
1739 REGISTER_BZ(DP_CTRL),
1740 REGISTER_AZ(MEM_STAT),
1741 REGISTER_AZ(CS_DEBUG),
1742 REGISTER_AZ(ALTERA_BUILD),
1743 REGISTER_AZ(CSR_SPARE),
1744 REGISTER_AB(PCIE_SD_CTL0123),
1745 REGISTER_AB(PCIE_SD_CTL45),
1746 REGISTER_AB(PCIE_PCS_CTL_STAT),
1747 /* DEBUG_DATA_OUT is not used */
1748 /* DRV_EV is WO */
1749 REGISTER_AZ(EVQ_CTL),
1750 REGISTER_AZ(EVQ_CNT1),
1751 REGISTER_AZ(EVQ_CNT2),
1752 REGISTER_AZ(BUF_TBL_CFG),
1753 REGISTER_AZ(SRM_RX_DC_CFG),
1754 REGISTER_AZ(SRM_TX_DC_CFG),
1755 REGISTER_AZ(SRM_CFG),
1756 /* BUF_TBL_UPD is WO */
1757 REGISTER_AZ(SRM_UPD_EVQ),
1758 REGISTER_AZ(SRAM_PARITY),
1759 REGISTER_AZ(RX_CFG),
1760 REGISTER_BZ(RX_FILTER_CTL),
1761 /* RX_FLUSH_DESCQ is WO */
1762 REGISTER_AZ(RX_DC_CFG),
1763 REGISTER_AZ(RX_DC_PF_WM),
1764 REGISTER_BZ(RX_RSS_TKEY),
1765 /* RX_NODESC_DROP is RC */
1766 REGISTER_AA(RX_SELF_RST),
1767 /* RX_DEBUG, RX_PUSH_DROP are not used */
1768 REGISTER_CZ(RX_RSS_IPV6_REG1),
1769 REGISTER_CZ(RX_RSS_IPV6_REG2),
1770 REGISTER_CZ(RX_RSS_IPV6_REG3),
1771 /* TX_FLUSH_DESCQ is WO */
1772 REGISTER_AZ(TX_DC_CFG),
1773 REGISTER_AA(TX_CHKSM_CFG),
1774 REGISTER_AZ(TX_CFG),
1775 /* TX_PUSH_DROP is not used */
1776 REGISTER_AZ(TX_RESERVED),
1777 REGISTER_BZ(TX_PACE),
1778 /* TX_PACE_DROP_QID is RC */
1779 REGISTER_BB(TX_VLAN),
1780 REGISTER_BZ(TX_IPFIL_PORTEN),
1781 REGISTER_AB(MD_TXD),
1782 REGISTER_AB(MD_RXD),
1783 REGISTER_AB(MD_CS),
1784 REGISTER_AB(MD_PHY_ADR),
1785 REGISTER_AB(MD_ID),
1786 /* MD_STAT is RC */
1787 REGISTER_AB(MAC_STAT_DMA),
1788 REGISTER_AB(MAC_CTRL),
1789 REGISTER_BB(GEN_MODE),
1790 REGISTER_AB(MAC_MC_HASH_REG0),
1791 REGISTER_AB(MAC_MC_HASH_REG1),
1792 REGISTER_AB(GM_CFG1),
1793 REGISTER_AB(GM_CFG2),
1794 /* GM_IPG and GM_HD are not used */
1795 REGISTER_AB(GM_MAX_FLEN),
1796 /* GM_TEST is not used */
1797 REGISTER_AB(GM_ADR1),
1798 REGISTER_AB(GM_ADR2),
1799 REGISTER_AB(GMF_CFG0),
1800 REGISTER_AB(GMF_CFG1),
1801 REGISTER_AB(GMF_CFG2),
1802 REGISTER_AB(GMF_CFG3),
1803 REGISTER_AB(GMF_CFG4),
1804 REGISTER_AB(GMF_CFG5),
1805 REGISTER_BB(TX_SRC_MAC_CTL),
1806 REGISTER_AB(XM_ADR_LO),
1807 REGISTER_AB(XM_ADR_HI),
1808 REGISTER_AB(XM_GLB_CFG),
1809 REGISTER_AB(XM_TX_CFG),
1810 REGISTER_AB(XM_RX_CFG),
1811 REGISTER_AB(XM_MGT_INT_MASK),
1812 REGISTER_AB(XM_FC),
1813 REGISTER_AB(XM_PAUSE_TIME),
1814 REGISTER_AB(XM_TX_PARAM),
1815 REGISTER_AB(XM_RX_PARAM),
1816 /* XM_MGT_INT_MSK (note no 'A') is RC */
1817 REGISTER_AB(XX_PWR_RST),
1818 REGISTER_AB(XX_SD_CTL),
1819 REGISTER_AB(XX_TXDRV_CTL),
1820 /* XX_PRBS_CTL, XX_PRBS_CHK and XX_PRBS_ERR are not used */
1821 /* XX_CORE_STAT is partly RC */
1822};
1823
1824struct efx_nic_reg_table {
1825 u32 offset:24;
1826 u32 min_revision:2, max_revision:2;
1827 u32 step:6, rows:21;
1828};
1829
1830#define REGISTER_TABLE_DIMENSIONS(_, offset, min_rev, max_rev, step, rows) { \
1831 offset, \
1832 REGISTER_REVISION_ ## min_rev, REGISTER_REVISION_ ## max_rev, \
1833 step, rows \
1834}
9c636baf 1835#define REGISTER_TABLE(name, min_rev, max_rev) \
5b98c1bf
BH		 1836 REGISTER_TABLE_DIMENSIONS( \
1837 name, FR_ ## min_rev ## max_rev ## _ ## name, \
1838 min_rev, max_rev, \
1839 FR_ ## min_rev ## max_rev ## _ ## name ## _STEP, \
1840 FR_ ## min_rev ## max_rev ## _ ## name ## _ROWS)
1841#define REGISTER_TABLE_AA(name) REGISTER_TABLE(name, A, A)
1842#define REGISTER_TABLE_AZ(name) REGISTER_TABLE(name, A, Z)
1843#define REGISTER_TABLE_BB(name) REGISTER_TABLE(name, B, B)
1844#define REGISTER_TABLE_BZ(name) REGISTER_TABLE(name, B, Z)
1845#define REGISTER_TABLE_BB_CZ(name) \
1846 REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, B, B, \
1847 FR_BZ_ ## name ## _STEP, \
1848 FR_BB_ ## name ## _ROWS), \
1849 REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, C, Z, \
1850 FR_BZ_ ## name ## _STEP, \
1851 FR_CZ_ ## name ## _ROWS)
1852#define REGISTER_TABLE_CZ(name) REGISTER_TABLE(name, C, Z)
1853
1854static const struct efx_nic_reg_table efx_nic_reg_tables[] = {
1855 /* DRIVER is not used */
1856 /* EVQ_RPTR, TIMER_COMMAND, USR_EV and {RX,TX}_DESC_UPD are WO */
1857 REGISTER_TABLE_BB(TX_IPFIL_TBL),
1858 REGISTER_TABLE_BB(TX_SRC_MAC_TBL),
1859 REGISTER_TABLE_AA(RX_DESC_PTR_TBL_KER),
1860 REGISTER_TABLE_BB_CZ(RX_DESC_PTR_TBL),
1861 REGISTER_TABLE_AA(TX_DESC_PTR_TBL_KER),
1862 REGISTER_TABLE_BB_CZ(TX_DESC_PTR_TBL),
1863 REGISTER_TABLE_AA(EVQ_PTR_TBL_KER),
1864 REGISTER_TABLE_BB_CZ(EVQ_PTR_TBL),
75abc51c 1865 /* We can't reasonably read all of the buffer table (up to 8MB!).
5b98c1bf
BH		 1866 * However this driver will only use a few entries. Reading
1867 * 1K entries allows for some expansion of queue count and
1868 * size before we need to change the version. */
1869 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL_KER, FR_AA_BUF_FULL_TBL_KER,
1870 A, A, 8, 1024),
1871 REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL, FR_BZ_BUF_FULL_TBL,
1872 B, Z, 8, 1024),
5b98c1bf
BH		 1873 REGISTER_TABLE_CZ(RX_MAC_FILTER_TBL0),
1874 REGISTER_TABLE_BB_CZ(TIMER_TBL),
1875 REGISTER_TABLE_BB_CZ(TX_PACE_TBL),
1876 REGISTER_TABLE_BZ(RX_INDIRECTION_TBL),
1877 /* TX_FILTER_TBL0 is huge and not used by this driver */
1878 REGISTER_TABLE_CZ(TX_MAC_FILTER_TBL0),
1879 REGISTER_TABLE_CZ(MC_TREG_SMEM),
1880 /* MSIX_PBA_TABLE is not mapped */
1881 /* SRM_DBG is not mapped (and is redundant with BUF_FLL_TBL) */
75abc51c 1882 REGISTER_TABLE_BZ(RX_FILTER_TBL0),
5b98c1bf
BH		 1883};
1884
1885size_t efx_nic_get_regs_len(struct efx_nic *efx)
1886{
1887 const struct efx_nic_reg *reg;
1888 const struct efx_nic_reg_table *table;
1889 size_t len = 0;
1890
1891 for (reg = efx_nic_regs;
1892 reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
1893 reg++)
1894 if (efx->type->revision >= reg->min_revision &&
1895 efx->type->revision <= reg->max_revision)
1896 len += sizeof(efx_oword_t);
1897
1898 for (table = efx_nic_reg_tables;
1899 table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
1900 table++)
1901 if (efx->type->revision >= table->min_revision &&
1902 efx->type->revision <= table->max_revision)
1903 len += table->rows * min_t(size_t, table->step, 16);
1904
1905 return len;
1906}
1907
1908void efx_nic_get_regs(struct efx_nic *efx, void *buf)
1909{
1910 const struct efx_nic_reg *reg;
1911 const struct efx_nic_reg_table *table;
1912
1913 for (reg = efx_nic_regs;
1914 reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
1915 reg++) {
1916 if (efx->type->revision >= reg->min_revision &&
1917 efx->type->revision <= reg->max_revision) {
1918 efx_reado(efx, (efx_oword_t *)buf, reg->offset);
1919 buf += sizeof(efx_oword_t);
1920 }
1921 }
1922
1923 for (table = efx_nic_reg_tables;
1924 table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
1925 table++) {
1926 size_t size, i;
1927
1928 if (!(efx->type->revision >= table->min_revision &&
1929 efx->type->revision <= table->max_revision))
1930 continue;
1931
1932 size = min_t(size_t, table->step, 16);
1933
1934 for (i = 0; i < table->rows; i++) {
1935 switch (table->step) {
1936 case 4: /* 32-bit register or SRAM */
1937 efx_readd_table(efx, buf, table->offset, i);
1938 break;
1939 case 8: /* 64-bit SRAM */
1940 efx_sram_readq(efx,
1941 efx->membase + table->offset,
1942 buf, i);
1943 break;
1944 case 16: /* 128-bit register */
1945 efx_reado_table(efx, buf, table->offset, i);
1946 break;
1947 case 32: /* 128-bit register, interleaved */
1948 efx_reado_table(efx, buf, table->offset, 2 * i);
1949 break;
1950 default:
1951 WARN_ON(1);
1952 return;
1953 }
1954 buf += size;
1955 }
1956 }
1957}
Linux kernel - Deliverables
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