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sfc: Break NAPI processing after one ring-full of TX completions
[net-next-2.6.git] / drivers / net / sfc / nic.c
CommitLineData
8e730c15
BH		 1/****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
906bb26c 4 * Copyright 2006-2009 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>
13#include <linux/pci.h>
14#include <linux/module.h>
15#include <linux/seq_file.h>
16#include "net_driver.h"
17#include "bitfield.h"
18#include "efx.h"
19#include "nic.h"
20#include "regs.h"
21#include "io.h"
22#include "workarounds.h"
23
24/**************************************************************************
25 *
26 * Configurable values
27 *
28 **************************************************************************
29 */
30
31/* This is set to 16 for a good reason. In summary, if larger than
32 * 16, the descriptor cache holds more than a default socket
33 * buffer's worth of packets (for UDP we can only have at most one
34 * socket buffer's worth outstanding). This combined with the fact
35 * that we only get 1 TX event per descriptor cache means the NIC
36 * goes idle.
37 */
38#define TX_DC_ENTRIES 16
39#define TX_DC_ENTRIES_ORDER 1
40
41#define RX_DC_ENTRIES 64
42#define RX_DC_ENTRIES_ORDER 3
43
44/* RX FIFO XOFF watermark
45 *
46 * When the amount of the RX FIFO increases used increases past this
47 * watermark send XOFF. Only used if RX flow control is enabled (ethtool -A)
48 * This also has an effect on RX/TX arbitration
49 */
50int efx_nic_rx_xoff_thresh = -1;
51module_param_named(rx_xoff_thresh_bytes, efx_nic_rx_xoff_thresh, int, 0644);
52MODULE_PARM_DESC(rx_xoff_thresh_bytes, "RX fifo XOFF threshold");
53
54/* RX FIFO XON watermark
55 *
56 * When the amount of the RX FIFO used decreases below this
57 * watermark send XON. Only used if TX flow control is enabled (ethtool -A)
58 * This also has an effect on RX/TX arbitration
59 */
60int efx_nic_rx_xon_thresh = -1;
61module_param_named(rx_xon_thresh_bytes, efx_nic_rx_xon_thresh, int, 0644);
62MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold");
63
64/* If EFX_MAX_INT_ERRORS internal errors occur within
65 * EFX_INT_ERROR_EXPIRE seconds, we consider the NIC broken and
66 * disable it.
67 */
68#define EFX_INT_ERROR_EXPIRE 3600
69#define EFX_MAX_INT_ERRORS 5
70
71/* We poll for events every FLUSH_INTERVAL ms, and check FLUSH_POLL_COUNT times
72 */
73#define EFX_FLUSH_INTERVAL 10
74#define EFX_FLUSH_POLL_COUNT 100
75
76/* Size and alignment of special buffers (4KB) */
77#define EFX_BUF_SIZE 4096
78
79/* Depth of RX flush request fifo */
80#define EFX_RX_FLUSH_COUNT 4
81
82/**************************************************************************
83 *
84 * Solarstorm hardware access
85 *
86 **************************************************************************/
87
88static inline void efx_write_buf_tbl(struct efx_nic *efx, efx_qword_t *value,
89 unsigned int index)
90{
91 efx_sram_writeq(efx, efx->membase + efx->type->buf_tbl_base,
92 value, index);
93}
94
95/* Read the current event from the event queue */
96static inline efx_qword_t *efx_event(struct efx_channel *channel,
97 unsigned int index)
98{
99 return (((efx_qword_t *) (channel->eventq.addr)) + index);
100}
101
102/* See if an event is present
103 *
104 * We check both the high and low dword of the event for all ones. We
105 * wrote all ones when we cleared the event, and no valid event can
106 * have all ones in either its high or low dwords. This approach is
107 * robust against reordering.
108 *
109 * Note that using a single 64-bit comparison is incorrect; even
110 * though the CPU read will be atomic, the DMA write may not be.
111 */
112static inline int efx_event_present(efx_qword_t *event)
113{
114 return (!(EFX_DWORD_IS_ALL_ONES(event->dword[0]) |
115 EFX_DWORD_IS_ALL_ONES(event->dword[1])));
116}
117
118static bool efx_masked_compare_oword(const efx_oword_t *a, const efx_oword_t *b,
119 const efx_oword_t *mask)
120{
121 return ((a->u64[0] ^ b->u64[0]) & mask->u64[0]) ||
122 ((a->u64[1] ^ b->u64[1]) & mask->u64[1]);
123}
124
125int efx_nic_test_registers(struct efx_nic *efx,
126 const struct efx_nic_register_test *regs,
127 size_t n_regs)
128{
129 unsigned address = 0, i, j;
130 efx_oword_t mask, imask, original, reg, buf;
131
132 /* Falcon should be in loopback to isolate the XMAC from the PHY */
133 WARN_ON(!LOOPBACK_INTERNAL(efx));
134
135 for (i = 0; i < n_regs; ++i) {
136 address = regs[i].address;
137 mask = imask = regs[i].mask;
138 EFX_INVERT_OWORD(imask);
139
140 efx_reado(efx, &original, address);
141
142 /* bit sweep on and off */
143 for (j = 0; j < 128; j++) {
144 if (!EFX_EXTRACT_OWORD32(mask, j, j))
145 continue;
146
147 /* Test this testable bit can be set in isolation */
148 EFX_AND_OWORD(reg, original, mask);
149 EFX_SET_OWORD32(reg, j, j, 1);
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 /* Test this testable bit can be cleared in isolation */
158 EFX_OR_OWORD(reg, original, mask);
159 EFX_SET_OWORD32(reg, j, j, 0);
160
161 efx_writeo(efx, &reg, address);
162 efx_reado(efx, &buf, address);
163
164 if (efx_masked_compare_oword(&reg, &buf, &mask))
165 goto fail;
166 }
167
168 efx_writeo(efx, &original, address);
169 }
170
171 return 0;
172
173fail:
174 EFX_ERR(efx, "wrote "EFX_OWORD_FMT" read "EFX_OWORD_FMT
175 " at address 0x%x mask "EFX_OWORD_FMT"\n", EFX_OWORD_VAL(reg),
176 EFX_OWORD_VAL(buf), address, EFX_OWORD_VAL(mask));
177 return -EIO;
178}
179
180/**************************************************************************
181 *
182 * Special buffer handling
183 * Special buffers are used for event queues and the TX and RX
184 * descriptor rings.
185 *
186 *************************************************************************/
187
188/*
189 * Initialise a special buffer
190 *
191 * This will define a buffer (previously allocated via
192 * efx_alloc_special_buffer()) in the buffer table, allowing
193 * it to be used for event queues, descriptor rings etc.
194 */
195static void
196efx_init_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
197{
198 efx_qword_t buf_desc;
199 int index;
200 dma_addr_t dma_addr;
201 int i;
202
203 EFX_BUG_ON_PARANOID(!buffer->addr);
204
205 /* Write buffer descriptors to NIC */
206 for (i = 0; i < buffer->entries; i++) {
207 index = buffer->index + i;
208 dma_addr = buffer->dma_addr + (i * 4096);
209 EFX_LOG(efx, "mapping special buffer %d at %llx\n",
210 index, (unsigned long long)dma_addr);
211 EFX_POPULATE_QWORD_3(buf_desc,
212 FRF_AZ_BUF_ADR_REGION, 0,
213 FRF_AZ_BUF_ADR_FBUF, dma_addr >> 12,
214 FRF_AZ_BUF_OWNER_ID_FBUF, 0);
215 efx_write_buf_tbl(efx, &buf_desc, index);
216 }
217}
218
219/* Unmaps a buffer and clears the buffer table entries */
220static void
221efx_fini_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
222{
223 efx_oword_t buf_tbl_upd;
224 unsigned int start = buffer->index;
225 unsigned int end = (buffer->index + buffer->entries - 1);
226
227 if (!buffer->entries)
228 return;
229
230 EFX_LOG(efx, "unmapping special buffers %d-%d\n",
231 buffer->index, buffer->index + buffer->entries - 1);
232
233 EFX_POPULATE_OWORD_4(buf_tbl_upd,
234 FRF_AZ_BUF_UPD_CMD, 0,
235 FRF_AZ_BUF_CLR_CMD, 1,
236 FRF_AZ_BUF_CLR_END_ID, end,
237 FRF_AZ_BUF_CLR_START_ID, start);
238 efx_writeo(efx, &buf_tbl_upd, FR_AZ_BUF_TBL_UPD);
239}
240
241/*
242 * Allocate a new special buffer
243 *
244 * This allocates memory for a new buffer, clears it and allocates a
245 * new buffer ID range. It does not write into the buffer table.
246 *
247 * This call will allocate 4KB buffers, since 8KB buffers can't be
248 * used for event queues and descriptor rings.
249 */
250static int efx_alloc_special_buffer(struct efx_nic *efx,
251 struct efx_special_buffer *buffer,
252 unsigned int len)
253{
254 len = ALIGN(len, EFX_BUF_SIZE);
255
256 buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
257 &buffer->dma_addr);
258 if (!buffer->addr)
259 return -ENOMEM;
260 buffer->len = len;
261 buffer->entries = len / EFX_BUF_SIZE;
262 BUG_ON(buffer->dma_addr & (EFX_BUF_SIZE - 1));
263
264 /* All zeros is a potentially valid event so memset to 0xff */
265 memset(buffer->addr, 0xff, len);
266
267 /* Select new buffer ID */
268 buffer->index = efx->next_buffer_table;
269 efx->next_buffer_table += buffer->entries;
270
271 EFX_LOG(efx, "allocating special buffers %d-%d at %llx+%x "
272 "(virt %p phys %llx)\n", buffer->index,
273 buffer->index + buffer->entries - 1,
274 (u64)buffer->dma_addr, len,
275 buffer->addr, (u64)virt_to_phys(buffer->addr));
276
277 return 0;
278}
279
280static void
281efx_free_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
282{
283 if (!buffer->addr)
284 return;
285
286 EFX_LOG(efx, "deallocating special buffers %d-%d at %llx+%x "
287 "(virt %p phys %llx)\n", buffer->index,
288 buffer->index + buffer->entries - 1,
289 (u64)buffer->dma_addr, buffer->len,
290 buffer->addr, (u64)virt_to_phys(buffer->addr));
291
292 pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr,
293 buffer->dma_addr);
294 buffer->addr = NULL;
295 buffer->entries = 0;
296}
297
298/**************************************************************************
299 *
300 * Generic buffer handling
301 * These buffers are used for interrupt status and MAC stats
302 *
303 **************************************************************************/
304
305int efx_nic_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer,
306 unsigned int len)
307{
308 buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
309 &buffer->dma_addr);
310 if (!buffer->addr)
311 return -ENOMEM;
312 buffer->len = len;
313 memset(buffer->addr, 0, len);
314 return 0;
315}
316
317void efx_nic_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
318{
319 if (buffer->addr) {
320 pci_free_consistent(efx->pci_dev, buffer->len,
321 buffer->addr, buffer->dma_addr);
322 buffer->addr = NULL;
323 }
324}
325
326/**************************************************************************
327 *
328 * TX path
329 *
330 **************************************************************************/
331
332/* Returns a pointer to the specified transmit descriptor in the TX
333 * descriptor queue belonging to the specified channel.
334 */
335static inline efx_qword_t *
336efx_tx_desc(struct efx_tx_queue *tx_queue, unsigned int index)
337{
338 return (((efx_qword_t *) (tx_queue->txd.addr)) + index);
339}
340
341/* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */
342static inline void efx_notify_tx_desc(struct efx_tx_queue *tx_queue)
343{
344 unsigned write_ptr;
345 efx_dword_t reg;
346
347 write_ptr = tx_queue->write_count & EFX_TXQ_MASK;
348 EFX_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr);
349 efx_writed_page(tx_queue->efx, &reg,
350 FR_AZ_TX_DESC_UPD_DWORD_P0, tx_queue->queue);
351}
352
353
354/* For each entry inserted into the software descriptor ring, create a
355 * descriptor in the hardware TX descriptor ring (in host memory), and
356 * write a doorbell.
357 */
358void efx_nic_push_buffers(struct efx_tx_queue *tx_queue)
359{
360
361 struct efx_tx_buffer *buffer;
362 efx_qword_t *txd;
363 unsigned write_ptr;
364
365 BUG_ON(tx_queue->write_count == tx_queue->insert_count);
366
367 do {
368 write_ptr = tx_queue->write_count & EFX_TXQ_MASK;
369 buffer = &tx_queue->buffer[write_ptr];
370 txd = efx_tx_desc(tx_queue, write_ptr);
371 ++tx_queue->write_count;
372
373 /* Create TX descriptor ring entry */
374 EFX_POPULATE_QWORD_4(*txd,
375 FSF_AZ_TX_KER_CONT, buffer->continuation,
376 FSF_AZ_TX_KER_BYTE_COUNT, buffer->len,
377 FSF_AZ_TX_KER_BUF_REGION, 0,
378 FSF_AZ_TX_KER_BUF_ADDR, buffer->dma_addr);
379 } while (tx_queue->write_count != tx_queue->insert_count);
380
381 wmb(); /* Ensure descriptors are written before they are fetched */
382 efx_notify_tx_desc(tx_queue);
383}
384
385/* Allocate hardware resources for a TX queue */
386int efx_nic_probe_tx(struct efx_tx_queue *tx_queue)
387{
388 struct efx_nic *efx = tx_queue->efx;
389 BUILD_BUG_ON(EFX_TXQ_SIZE < 512 || EFX_TXQ_SIZE > 4096 ||
390 EFX_TXQ_SIZE & EFX_TXQ_MASK);
391 return efx_alloc_special_buffer(efx, &tx_queue->txd,
392 EFX_TXQ_SIZE * sizeof(efx_qword_t));
393}
394
395void efx_nic_init_tx(struct efx_tx_queue *tx_queue)
396{
397 efx_oword_t tx_desc_ptr;
398 struct efx_nic *efx = tx_queue->efx;
399
400 tx_queue->flushed = FLUSH_NONE;
401
402 /* Pin TX descriptor ring */
403 efx_init_special_buffer(efx, &tx_queue->txd);
404
405 /* Push TX descriptor ring to card */
406 EFX_POPULATE_OWORD_10(tx_desc_ptr,
407 FRF_AZ_TX_DESCQ_EN, 1,
408 FRF_AZ_TX_ISCSI_DDIG_EN, 0,
409 FRF_AZ_TX_ISCSI_HDIG_EN, 0,
410 FRF_AZ_TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index,
411 FRF_AZ_TX_DESCQ_EVQ_ID,
412 tx_queue->channel->channel,
413 FRF_AZ_TX_DESCQ_OWNER_ID, 0,
414 FRF_AZ_TX_DESCQ_LABEL, tx_queue->queue,
415 FRF_AZ_TX_DESCQ_SIZE,
416 __ffs(tx_queue->txd.entries),
417 FRF_AZ_TX_DESCQ_TYPE, 0,
418 FRF_BZ_TX_NON_IP_DROP_DIS, 1);
419
420 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) {
421 int csum = tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM;
422 EFX_SET_OWORD_FIELD(tx_desc_ptr, FRF_BZ_TX_IP_CHKSM_DIS, !csum);
423 EFX_SET_OWORD_FIELD(tx_desc_ptr, FRF_BZ_TX_TCP_CHKSM_DIS,
424 !csum);
425 }
426
427 efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
428 tx_queue->queue);
429
430 if (efx_nic_rev(efx) < EFX_REV_FALCON_B0) {
431 efx_oword_t reg;
432
433 /* Only 128 bits in this register */
434 BUILD_BUG_ON(EFX_TX_QUEUE_COUNT >= 128);
435
436 efx_reado(efx, &reg, FR_AA_TX_CHKSM_CFG);
437 if (tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM)
438 clear_bit_le(tx_queue->queue, (void *)&reg);
439 else
440 set_bit_le(tx_queue->queue, (void *)&reg);
441 efx_writeo(efx, &reg, FR_AA_TX_CHKSM_CFG);
442 }
443}
444
445static void efx_flush_tx_queue(struct efx_tx_queue *tx_queue)
446{
447 struct efx_nic *efx = tx_queue->efx;
448 efx_oword_t tx_flush_descq;
449
450 tx_queue->flushed = FLUSH_PENDING;
451
452 /* Post a flush command */
453 EFX_POPULATE_OWORD_2(tx_flush_descq,
454 FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
455 FRF_AZ_TX_FLUSH_DESCQ, tx_queue->queue);
456 efx_writeo(efx, &tx_flush_descq, FR_AZ_TX_FLUSH_DESCQ);
457}
458
459void efx_nic_fini_tx(struct efx_tx_queue *tx_queue)
460{
461 struct efx_nic *efx = tx_queue->efx;
462 efx_oword_t tx_desc_ptr;
463
464 /* The queue should have been flushed */
465 WARN_ON(tx_queue->flushed != FLUSH_DONE);
466
467 /* Remove TX descriptor ring from card */
468 EFX_ZERO_OWORD(tx_desc_ptr);
469 efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
470 tx_queue->queue);
471
472 /* Unpin TX descriptor ring */
473 efx_fini_special_buffer(efx, &tx_queue->txd);
474}
475
476/* Free buffers backing TX queue */
477void efx_nic_remove_tx(struct efx_tx_queue *tx_queue)
478{
479 efx_free_special_buffer(tx_queue->efx, &tx_queue->txd);
480}
481
482/**************************************************************************
483 *
484 * RX path
485 *
486 **************************************************************************/
487
488/* Returns a pointer to the specified descriptor in the RX descriptor queue */
489static inline efx_qword_t *
490efx_rx_desc(struct efx_rx_queue *rx_queue, unsigned int index)
491{
492 return (((efx_qword_t *) (rx_queue->rxd.addr)) + index);
493}
494
495/* This creates an entry in the RX descriptor queue */
496static inline void
497efx_build_rx_desc(struct efx_rx_queue *rx_queue, unsigned index)
498{
499 struct efx_rx_buffer *rx_buf;
500 efx_qword_t *rxd;
501
502 rxd = efx_rx_desc(rx_queue, index);
503 rx_buf = efx_rx_buffer(rx_queue, index);
504 EFX_POPULATE_QWORD_3(*rxd,
505 FSF_AZ_RX_KER_BUF_SIZE,
506 rx_buf->len -
507 rx_queue->efx->type->rx_buffer_padding,
508 FSF_AZ_RX_KER_BUF_REGION, 0,
509 FSF_AZ_RX_KER_BUF_ADDR, rx_buf->dma_addr);
510}
511
512/* This writes to the RX_DESC_WPTR register for the specified receive
513 * descriptor ring.
514 */
515void efx_nic_notify_rx_desc(struct efx_rx_queue *rx_queue)
516{
517 efx_dword_t reg;
518 unsigned write_ptr;
519
520 while (rx_queue->notified_count != rx_queue->added_count) {
521 efx_build_rx_desc(rx_queue,
522 rx_queue->notified_count &
523 EFX_RXQ_MASK);
524 ++rx_queue->notified_count;
525 }
526
527 wmb();
528 write_ptr = rx_queue->added_count & EFX_RXQ_MASK;
529 EFX_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr);
530 efx_writed_page(rx_queue->efx, &reg,
531 FR_AZ_RX_DESC_UPD_DWORD_P0, rx_queue->queue);
532}
533
534int efx_nic_probe_rx(struct efx_rx_queue *rx_queue)
535{
536 struct efx_nic *efx = rx_queue->efx;
537 BUILD_BUG_ON(EFX_RXQ_SIZE < 512 || EFX_RXQ_SIZE > 4096 ||
538 EFX_RXQ_SIZE & EFX_RXQ_MASK);
539 return efx_alloc_special_buffer(efx, &rx_queue->rxd,
540 EFX_RXQ_SIZE * sizeof(efx_qword_t));
541}
542
543void efx_nic_init_rx(struct efx_rx_queue *rx_queue)
544{
545 efx_oword_t rx_desc_ptr;
546 struct efx_nic *efx = rx_queue->efx;
547 bool is_b0 = efx_nic_rev(efx) >= EFX_REV_FALCON_B0;
548 bool iscsi_digest_en = is_b0;
549
550 EFX_LOG(efx, "RX queue %d ring in special buffers %d-%d\n",
551 rx_queue->queue, rx_queue->rxd.index,
552 rx_queue->rxd.index + rx_queue->rxd.entries - 1);
553
554 rx_queue->flushed = FLUSH_NONE;
555
556 /* Pin RX descriptor ring */
557 efx_init_special_buffer(efx, &rx_queue->rxd);
558
559 /* Push RX descriptor ring to card */
560 EFX_POPULATE_OWORD_10(rx_desc_ptr,
561 FRF_AZ_RX_ISCSI_DDIG_EN, iscsi_digest_en,
562 FRF_AZ_RX_ISCSI_HDIG_EN, iscsi_digest_en,
563 FRF_AZ_RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index,
564 FRF_AZ_RX_DESCQ_EVQ_ID,
565 rx_queue->channel->channel,
566 FRF_AZ_RX_DESCQ_OWNER_ID, 0,
567 FRF_AZ_RX_DESCQ_LABEL, rx_queue->queue,
568 FRF_AZ_RX_DESCQ_SIZE,
569 __ffs(rx_queue->rxd.entries),
570 FRF_AZ_RX_DESCQ_TYPE, 0 /* kernel queue */ ,
571 /* For >=B0 this is scatter so disable */
572 FRF_AZ_RX_DESCQ_JUMBO, !is_b0,
573 FRF_AZ_RX_DESCQ_EN, 1);
574 efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
575 rx_queue->queue);
576}
577
578static void efx_flush_rx_queue(struct efx_rx_queue *rx_queue)
579{
580 struct efx_nic *efx = rx_queue->efx;
581 efx_oword_t rx_flush_descq;
582
583 rx_queue->flushed = FLUSH_PENDING;
584
585 /* Post a flush command */
586 EFX_POPULATE_OWORD_2(rx_flush_descq,
587 FRF_AZ_RX_FLUSH_DESCQ_CMD, 1,
588 FRF_AZ_RX_FLUSH_DESCQ, rx_queue->queue);
589 efx_writeo(efx, &rx_flush_descq, FR_AZ_RX_FLUSH_DESCQ);
590}
591
592void efx_nic_fini_rx(struct efx_rx_queue *rx_queue)
593{
594 efx_oword_t rx_desc_ptr;
595 struct efx_nic *efx = rx_queue->efx;
596
597 /* The queue should already have been flushed */
598 WARN_ON(rx_queue->flushed != FLUSH_DONE);
599
600 /* Remove RX descriptor ring from card */
601 EFX_ZERO_OWORD(rx_desc_ptr);
602 efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
603 rx_queue->queue);
604
605 /* Unpin RX descriptor ring */
606 efx_fini_special_buffer(efx, &rx_queue->rxd);
607}
608
609/* Free buffers backing RX queue */
610void efx_nic_remove_rx(struct efx_rx_queue *rx_queue)
611{
612 efx_free_special_buffer(rx_queue->efx, &rx_queue->rxd);
613}
614
615/**************************************************************************
616 *
617 * Event queue processing
618 * Event queues are processed by per-channel tasklets.
619 *
620 **************************************************************************/
621
622/* Update a channel's event queue's read pointer (RPTR) register
623 *
624 * This writes the EVQ_RPTR_REG register for the specified channel's
625 * event queue.
8e730c15
BH		 626 */
627void efx_nic_eventq_read_ack(struct efx_channel *channel)
628{
629 efx_dword_t reg;
630 struct efx_nic *efx = channel->efx;
631
632 EFX_POPULATE_DWORD_1(reg, FRF_AZ_EVQ_RPTR, channel->eventq_read_ptr);
633 efx_writed_table(efx, &reg, efx->type->evq_rptr_tbl_base,
634 channel->channel);
635}
636
637/* Use HW to insert a SW defined event */
638void efx_generate_event(struct efx_channel *channel, efx_qword_t *event)
639{
640 efx_oword_t drv_ev_reg;
641
642 BUILD_BUG_ON(FRF_AZ_DRV_EV_DATA_LBN != 0 ||
643 FRF_AZ_DRV_EV_DATA_WIDTH != 64);
644 drv_ev_reg.u32[0] = event->u32[0];
645 drv_ev_reg.u32[1] = event->u32[1];
646 drv_ev_reg.u32[2] = 0;
647 drv_ev_reg.u32[3] = 0;
648 EFX_SET_OWORD_FIELD(drv_ev_reg, FRF_AZ_DRV_EV_QID, channel->channel);
649 efx_writeo(channel->efx, &drv_ev_reg, FR_AZ_DRV_EV);
650}
651
652/* Handle a transmit completion event
653 *
654 * The NIC batches TX completion events; the message we receive is of
655 * the form "complete all TX events up to this index".
656 */
fa236e18 657static int
8e730c15
BH		 658efx_handle_tx_event(struct efx_channel *channel, efx_qword_t *event)
659{
660 unsigned int tx_ev_desc_ptr;
661 unsigned int tx_ev_q_label;
662 struct efx_tx_queue *tx_queue;
663 struct efx_nic *efx = channel->efx;
fa236e18 664 int tx_packets = 0;
8e730c15
BH		 665
666 if (likely(EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_COMP))) {
667 /* Transmit completion */
668 tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR);
669 tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
670 tx_queue = &efx->tx_queue[tx_ev_q_label];
fa236e18
BH		 671 tx_packets = ((tx_ev_desc_ptr - tx_queue->read_count) &
672 EFX_TXQ_MASK);
673 channel->irq_mod_score += tx_packets;
8e730c15
BH		 674 efx_xmit_done(tx_queue, tx_ev_desc_ptr);
675 } else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) {
676 /* Rewrite the FIFO write pointer */
677 tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
678 tx_queue = &efx->tx_queue[tx_ev_q_label];
679
680 if (efx_dev_registered(efx))
681 netif_tx_lock(efx->net_dev);
682 efx_notify_tx_desc(tx_queue);
683 if (efx_dev_registered(efx))
684 netif_tx_unlock(efx->net_dev);
685 } else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_PKT_ERR) &&
686 EFX_WORKAROUND_10727(efx)) {
687 efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
688 } else {
689 EFX_ERR(efx, "channel %d unexpected TX event "
690 EFX_QWORD_FMT"\n", channel->channel,
691 EFX_QWORD_VAL(*event));
692 }
fa236e18
BH		 693
694 return tx_packets;
8e730c15
BH		 695}
696
697/* Detect errors included in the rx_evt_pkt_ok bit. */
698static void efx_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
699 const efx_qword_t *event,
700 bool *rx_ev_pkt_ok,
701 bool *discard)
702{
703 struct efx_nic *efx = rx_queue->efx;
704 bool rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err;
705 bool rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
706 bool rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc;
707 bool rx_ev_other_err, rx_ev_pause_frm;
708 bool rx_ev_hdr_type, rx_ev_mcast_pkt;
709 unsigned rx_ev_pkt_type;
710
711 rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
712 rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
713 rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC);
714 rx_ev_pkt_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_TYPE);
715 rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event,
716 FSF_AZ_RX_EV_BUF_OWNER_ID_ERR);
717 rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event,
718 FSF_AZ_RX_EV_IP_HDR_CHKSUM_ERR);
719 rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event,
720 FSF_AZ_RX_EV_TCP_UDP_CHKSUM_ERR);
721 rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_ETH_CRC_ERR);
722 rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_FRM_TRUNC);
723 rx_ev_drib_nib = ((efx_nic_rev(efx) >= EFX_REV_FALCON_B0) ?
724 0 : EFX_QWORD_FIELD(*event, FSF_AA_RX_EV_DRIB_NIB));
725 rx_ev_pause_frm = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PAUSE_FRM_ERR);
726
727 /* Every error apart from tobe_disc and pause_frm */
728 rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err |
729 rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
730 rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);
731
732 /* Count errors that are not in MAC stats. Ignore expected
733 * checksum errors during self-test. */
734 if (rx_ev_frm_trunc)
735 ++rx_queue->channel->n_rx_frm_trunc;
736 else if (rx_ev_tobe_disc)
737 ++rx_queue->channel->n_rx_tobe_disc;
738 else if (!efx->loopback_selftest) {
739 if (rx_ev_ip_hdr_chksum_err)
740 ++rx_queue->channel->n_rx_ip_hdr_chksum_err;
741 else if (rx_ev_tcp_udp_chksum_err)
742 ++rx_queue->channel->n_rx_tcp_udp_chksum_err;
743 }
744
745 /* The frame must be discarded if any of these are true. */
746 *discard = (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib |
747 rx_ev_tobe_disc | rx_ev_pause_frm);
748
749 /* TOBE_DISC is expected on unicast mismatches; don't print out an
750 * error message. FRM_TRUNC indicates RXDP dropped the packet due
751 * to a FIFO overflow.
752 */
753#ifdef EFX_ENABLE_DEBUG
754 if (rx_ev_other_err) {
755 EFX_INFO_RL(efx, " RX queue %d unexpected RX event "
756 EFX_QWORD_FMT "%s%s%s%s%s%s%s%s\n",
757 rx_queue->queue, EFX_QWORD_VAL(*event),
758 rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "",
759 rx_ev_ip_hdr_chksum_err ?
760 " [IP_HDR_CHKSUM_ERR]" : "",
761 rx_ev_tcp_udp_chksum_err ?
762 " [TCP_UDP_CHKSUM_ERR]" : "",
763 rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "",
764 rx_ev_frm_trunc ? " [FRM_TRUNC]" : "",
765 rx_ev_drib_nib ? " [DRIB_NIB]" : "",
766 rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
767 rx_ev_pause_frm ? " [PAUSE]" : "");
768 }
769#endif
770}
771
772/* Handle receive events that are not in-order. */
773static void
774efx_handle_rx_bad_index(struct efx_rx_queue *rx_queue, unsigned index)
775{
776 struct efx_nic *efx = rx_queue->efx;
777 unsigned expected, dropped;
778
779 expected = rx_queue->removed_count & EFX_RXQ_MASK;
780 dropped = (index - expected) & EFX_RXQ_MASK;
781 EFX_INFO(efx, "dropped %d events (index=%d expected=%d)\n",
782 dropped, index, expected);
783
784 efx_schedule_reset(efx, EFX_WORKAROUND_5676(efx) ?
785 RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
786}
787
788/* Handle a packet received event
789 *
790 * The NIC gives a "discard" flag if it's a unicast packet with the
791 * wrong destination address
792 * Also "is multicast" and "matches multicast filter" flags can be used to
793 * discard non-matching multicast packets.
794 */
795static void
796efx_handle_rx_event(struct efx_channel *channel, const efx_qword_t *event)
797{
798 unsigned int rx_ev_desc_ptr, rx_ev_byte_cnt;
799 unsigned int rx_ev_hdr_type, rx_ev_mcast_pkt;
800 unsigned expected_ptr;
801 bool rx_ev_pkt_ok, discard = false, checksummed;
802 struct efx_rx_queue *rx_queue;
803 struct efx_nic *efx = channel->efx;
804
805 /* Basic packet information */
806 rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_BYTE_CNT);
807 rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_OK);
808 rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
809 WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_JUMBO_CONT));
810 WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_SOP) != 1);
811 WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_Q_LABEL) !=
812 channel->channel);
813
814 rx_queue = &efx->rx_queue[channel->channel];
815
816 rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR);
817 expected_ptr = rx_queue->removed_count & EFX_RXQ_MASK;
818 if (unlikely(rx_ev_desc_ptr != expected_ptr))
819 efx_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);
820
821 if (likely(rx_ev_pkt_ok)) {
822 /* If packet is marked as OK and packet type is TCP/IP or
823 * UDP/IP, then we can rely on the hardware checksum.
824 */
825 checksummed =
826 likely(efx->rx_checksum_enabled) &&
827 (rx_ev_hdr_type == FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_TCP ||
828 rx_ev_hdr_type == FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_UDP);
829 } else {
830 efx_handle_rx_not_ok(rx_queue, event, &rx_ev_pkt_ok, &discard);
831 checksummed = false;
832 }
833
834 /* Detect multicast packets that didn't match the filter */
835 rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
836 if (rx_ev_mcast_pkt) {
837 unsigned int rx_ev_mcast_hash_match =
838 EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_HASH_MATCH);
839
840 if (unlikely(!rx_ev_mcast_hash_match)) {
841 ++channel->n_rx_mcast_mismatch;
842 discard = true;
843 }
844 }
845
846 channel->irq_mod_score += 2;
847
848 /* Handle received packet */
849 efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt,
850 checksummed, discard);
851}
852
853/* Global events are basically PHY events */
854static void
855efx_handle_global_event(struct efx_channel *channel, efx_qword_t *event)
856{
857 struct efx_nic *efx = channel->efx;
858 bool handled = false;
859
860 if (EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_G_PHY0_INTR) ||
861 EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_XG_PHY0_INTR) ||
862 EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_XFP_PHY0_INTR)) {
863 /* Ignored */
864 handled = true;
865 }
866
867 if ((efx_nic_rev(efx) >= EFX_REV_FALCON_B0) &&
868 EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_XG_MGT_INTR)) {
869 efx->xmac_poll_required = true;
870 handled = true;
871 }
872
873 if (efx_nic_rev(efx) <= EFX_REV_FALCON_A1 ?
874 EFX_QWORD_FIELD(*event, FSF_AA_GLB_EV_RX_RECOVERY) :
875 EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_RX_RECOVERY)) {
876 EFX_ERR(efx, "channel %d seen global RX_RESET "
877 "event. Resetting.\n", channel->channel);
878
879 atomic_inc(&efx->rx_reset);
880 efx_schedule_reset(efx, EFX_WORKAROUND_6555(efx) ?
881 RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
882 handled = true;
883 }
884
885 if (!handled)
886 EFX_ERR(efx, "channel %d unknown global event "
887 EFX_QWORD_FMT "\n", channel->channel,
888 EFX_QWORD_VAL(*event));
889}
890
891static void
892efx_handle_driver_event(struct efx_channel *channel, efx_qword_t *event)
893{
894 struct efx_nic *efx = channel->efx;
895 unsigned int ev_sub_code;
896 unsigned int ev_sub_data;
897
898 ev_sub_code = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBCODE);
899 ev_sub_data = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);
900
901 switch (ev_sub_code) {
902 case FSE_AZ_TX_DESCQ_FLS_DONE_EV:
903 EFX_TRACE(efx, "channel %d TXQ %d flushed\n",
904 channel->channel, ev_sub_data);
905 break;
906 case FSE_AZ_RX_DESCQ_FLS_DONE_EV:
907 EFX_TRACE(efx, "channel %d RXQ %d flushed\n",
908 channel->channel, ev_sub_data);
909 break;
910 case FSE_AZ_EVQ_INIT_DONE_EV:
911 EFX_LOG(efx, "channel %d EVQ %d initialised\n",
912 channel->channel, ev_sub_data);
913 break;
914 case FSE_AZ_SRM_UPD_DONE_EV:
915 EFX_TRACE(efx, "channel %d SRAM update done\n",
916 channel->channel);
917 break;
918 case FSE_AZ_WAKE_UP_EV:
919 EFX_TRACE(efx, "channel %d RXQ %d wakeup event\n",
920 channel->channel, ev_sub_data);
921 break;
922 case FSE_AZ_TIMER_EV:
923 EFX_TRACE(efx, "channel %d RX queue %d timer expired\n",
924 channel->channel, ev_sub_data);
925 break;
926 case FSE_AA_RX_RECOVER_EV:
927 EFX_ERR(efx, "channel %d seen DRIVER RX_RESET event. "
928 "Resetting.\n", channel->channel);
929 atomic_inc(&efx->rx_reset);
930 efx_schedule_reset(efx,
931 EFX_WORKAROUND_6555(efx) ?
932 RESET_TYPE_RX_RECOVERY :
933 RESET_TYPE_DISABLE);
934 break;
935 case FSE_BZ_RX_DSC_ERROR_EV:
936 EFX_ERR(efx, "RX DMA Q %d reports descriptor fetch error."
937 " RX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
938 efx_schedule_reset(efx, RESET_TYPE_RX_DESC_FETCH);
939 break;
940 case FSE_BZ_TX_DSC_ERROR_EV:
941 EFX_ERR(efx, "TX DMA Q %d reports descriptor fetch error."
942 " TX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
943 efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
944 break;
945 default:
946 EFX_TRACE(efx, "channel %d unknown driver event code %d "
947 "data %04x\n", channel->channel, ev_sub_code,
948 ev_sub_data);
949 break;
950 }
951}
952
fa236e18 953int efx_nic_process_eventq(struct efx_channel *channel, int budget)
8e730c15
BH		 954{
955 unsigned int read_ptr;
956 efx_qword_t event, *p_event;
957 int ev_code;
fa236e18
BH		 958 int tx_packets = 0;
959 int spent = 0;
8e730c15
BH		 960
961 read_ptr = channel->eventq_read_ptr;
962
fa236e18 963 for (;;) {
8e730c15
BH		 964 p_event = efx_event(channel, read_ptr);
965 event = *p_event;
966
967 if (!efx_event_present(&event))
968 /* End of events */
969 break;
970
971 EFX_TRACE(channel->efx, "channel %d event is "EFX_QWORD_FMT"\n",
972 channel->channel, EFX_QWORD_VAL(event));
973
974 /* Clear this event by marking it all ones */
975 EFX_SET_QWORD(*p_event);
976
fa236e18
BH		 977 /* Increment read pointer */
978 read_ptr = (read_ptr + 1) & EFX_EVQ_MASK;
979
8e730c15
BH		 980 ev_code = EFX_QWORD_FIELD(event, FSF_AZ_EV_CODE);
981
982 switch (ev_code) {
983 case FSE_AZ_EV_CODE_RX_EV:
984 efx_handle_rx_event(channel, &event);
fa236e18
BH		 985 if (++spent == budget)
986 goto out;
8e730c15
BH		 987 break;
988 case FSE_AZ_EV_CODE_TX_EV:
fa236e18
BH		 989 tx_packets += efx_handle_tx_event(channel, &event);
990 if (tx_packets >= EFX_TXQ_SIZE) {
991 spent = budget;
992 goto out;
993 }
8e730c15
BH		 994 break;
995 case FSE_AZ_EV_CODE_DRV_GEN_EV:
996 channel->eventq_magic = EFX_QWORD_FIELD(
997 event, FSF_AZ_DRV_GEN_EV_MAGIC);
998 EFX_LOG(channel->efx, "channel %d received generated "
999 "event "EFX_QWORD_FMT"\n", channel->channel,
1000 EFX_QWORD_VAL(event));
1001 break;
1002 case FSE_AZ_EV_CODE_GLOBAL_EV:
1003 efx_handle_global_event(channel, &event);
1004 break;
1005 case FSE_AZ_EV_CODE_DRIVER_EV:
1006 efx_handle_driver_event(channel, &event);
1007 break;
8880f4ec
BH		 1008 case FSE_CZ_EV_CODE_MCDI_EV:
1009 efx_mcdi_process_event(channel, &event);
1010 break;
8e730c15
BH		 1011 default:
1012 EFX_ERR(channel->efx, "channel %d unknown event type %d"
1013 " (data " EFX_QWORD_FMT ")\n", channel->channel,
1014 ev_code, EFX_QWORD_VAL(event));
1015 }
fa236e18 1016 }
8e730c15 1017
fa236e18 1018out:
8e730c15 1019 channel->eventq_read_ptr = read_ptr;
fa236e18 1020 return spent;
8e730c15
BH		 1021}
1022
1023
1024/* Allocate buffer table entries for event queue */
1025int efx_nic_probe_eventq(struct efx_channel *channel)
1026{
1027 struct efx_nic *efx = channel->efx;
1028 BUILD_BUG_ON(EFX_EVQ_SIZE < 512 || EFX_EVQ_SIZE > 32768 ||
1029 EFX_EVQ_SIZE & EFX_EVQ_MASK);
1030 return efx_alloc_special_buffer(efx, &channel->eventq,
1031 EFX_EVQ_SIZE * sizeof(efx_qword_t));
1032}
1033
1034void efx_nic_init_eventq(struct efx_channel *channel)
1035{
8880f4ec 1036 efx_oword_t reg;
8e730c15
BH		 1037 struct efx_nic *efx = channel->efx;
1038
1039 EFX_LOG(efx, "channel %d event queue in special buffers %d-%d\n",
1040 channel->channel, channel->eventq.index,
1041 channel->eventq.index + channel->eventq.entries - 1);
1042
8880f4ec
BH		 1043 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0) {
1044 EFX_POPULATE_OWORD_3(reg,
1045 FRF_CZ_TIMER_Q_EN, 1,
1046 FRF_CZ_HOST_NOTIFY_MODE, 0,
1047 FRF_CZ_TIMER_MODE, FFE_CZ_TIMER_MODE_DIS);
1048 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL, channel->channel);
1049 }
1050
8e730c15
BH		 1051 /* Pin event queue buffer */
1052 efx_init_special_buffer(efx, &channel->eventq);
1053
1054 /* Fill event queue with all ones (i.e. empty events) */
1055 memset(channel->eventq.addr, 0xff, channel->eventq.len);
1056
1057 /* Push event queue to card */
8880f4ec 1058 EFX_POPULATE_OWORD_3(reg,
8e730c15
BH		 1059 FRF_AZ_EVQ_EN, 1,
1060 FRF_AZ_EVQ_SIZE, __ffs(channel->eventq.entries),
1061 FRF_AZ_EVQ_BUF_BASE_ID, channel->eventq.index);
8880f4ec 1062 efx_writeo_table(efx, &reg, efx->type->evq_ptr_tbl_base,
8e730c15
BH		 1063 channel->channel);
1064
1065 efx->type->push_irq_moderation(channel);
1066}
1067
1068void efx_nic_fini_eventq(struct efx_channel *channel)
1069{
8880f4ec 1070 efx_oword_t reg;
8e730c15
BH		 1071 struct efx_nic *efx = channel->efx;
1072
1073 /* Remove event queue from card */
8880f4ec
BH		 1074 EFX_ZERO_OWORD(reg);
1075 efx_writeo_table(efx, &reg, efx->type->evq_ptr_tbl_base,
8e730c15 1076 channel->channel);
8880f4ec
BH		 1077 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0)
1078 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL, channel->channel);
8e730c15
BH		 1079
1080 /* Unpin event queue */
1081 efx_fini_special_buffer(efx, &channel->eventq);
1082}
1083
1084/* Free buffers backing event queue */
1085void efx_nic_remove_eventq(struct efx_channel *channel)
1086{
1087 efx_free_special_buffer(channel->efx, &channel->eventq);
1088}
1089
1090
1091/* Generates a test event on the event queue. A subsequent call to
1092 * process_eventq() should pick up the event and place the value of
1093 * "magic" into channel->eventq_magic;
1094 */
1095void efx_nic_generate_test_event(struct efx_channel *channel, unsigned int magic)
1096{
1097 efx_qword_t test_event;
1098
1099 EFX_POPULATE_QWORD_2(test_event, FSF_AZ_EV_CODE,
1100 FSE_AZ_EV_CODE_DRV_GEN_EV,
1101 FSF_AZ_DRV_GEN_EV_MAGIC, magic);
1102 efx_generate_event(channel, &test_event);
1103}
1104
1105/**************************************************************************
1106 *
1107 * Flush handling
1108 *
1109 **************************************************************************/
1110
1111
1112static void efx_poll_flush_events(struct efx_nic *efx)
1113{
1114 struct efx_channel *channel = &efx->channel[0];
1115 struct efx_tx_queue *tx_queue;
1116 struct efx_rx_queue *rx_queue;
1117 unsigned int read_ptr = channel->eventq_read_ptr;
1118 unsigned int end_ptr = (read_ptr - 1) & EFX_EVQ_MASK;
1119
1120 do {
1121 efx_qword_t *event = efx_event(channel, read_ptr);
1122 int ev_code, ev_sub_code, ev_queue;
1123 bool ev_failed;
1124
1125 if (!efx_event_present(event))
1126 break;
1127
1128 ev_code = EFX_QWORD_FIELD(*event, FSF_AZ_EV_CODE);
1129 ev_sub_code = EFX_QWORD_FIELD(*event,
1130 FSF_AZ_DRIVER_EV_SUBCODE);
1131 if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV &&
1132 ev_sub_code == FSE_AZ_TX_DESCQ_FLS_DONE_EV) {
1133 ev_queue = EFX_QWORD_FIELD(*event,
1134 FSF_AZ_DRIVER_EV_SUBDATA);
1135 if (ev_queue < EFX_TX_QUEUE_COUNT) {
1136 tx_queue = efx->tx_queue + ev_queue;
1137 tx_queue->flushed = FLUSH_DONE;
1138 }
1139 } else if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV &&
1140 ev_sub_code == FSE_AZ_RX_DESCQ_FLS_DONE_EV) {
1141 ev_queue = EFX_QWORD_FIELD(
1142 *event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID);
1143 ev_failed = EFX_QWORD_FIELD(
1144 *event, FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL);
1145 if (ev_queue < efx->n_rx_queues) {
1146 rx_queue = efx->rx_queue + ev_queue;
1147 rx_queue->flushed =
1148 ev_failed ? FLUSH_FAILED : FLUSH_DONE;
1149 }
1150 }
1151
1152 /* We're about to destroy the queue anyway, so
1153 * it's ok to throw away every non-flush event */
1154 EFX_SET_QWORD(*event);
1155
1156 read_ptr = (read_ptr + 1) & EFX_EVQ_MASK;
1157 } while (read_ptr != end_ptr);
1158
1159 channel->eventq_read_ptr = read_ptr;
1160}
1161
1162/* Handle tx and rx flushes at the same time, since they run in
1163 * parallel in the hardware and there's no reason for us to
1164 * serialise them */
1165int efx_nic_flush_queues(struct efx_nic *efx)
1166{
1167 struct efx_rx_queue *rx_queue;
1168 struct efx_tx_queue *tx_queue;
1169 int i, tx_pending, rx_pending;
1170
1171 /* If necessary prepare the hardware for flushing */
1172 efx->type->prepare_flush(efx);
1173
1174 /* Flush all tx queues in parallel */
1175 efx_for_each_tx_queue(tx_queue, efx)
1176 efx_flush_tx_queue(tx_queue);
1177
1178 /* The hardware supports four concurrent rx flushes, each of which may
1179 * need to be retried if there is an outstanding descriptor fetch */
1180 for (i = 0; i < EFX_FLUSH_POLL_COUNT; ++i) {
1181 rx_pending = tx_pending = 0;
1182 efx_for_each_rx_queue(rx_queue, efx) {
1183 if (rx_queue->flushed == FLUSH_PENDING)
1184 ++rx_pending;
1185 }
1186 efx_for_each_rx_queue(rx_queue, efx) {
1187 if (rx_pending == EFX_RX_FLUSH_COUNT)
1188 break;
1189 if (rx_queue->flushed == FLUSH_FAILED ||
1190 rx_queue->flushed == FLUSH_NONE) {
1191 efx_flush_rx_queue(rx_queue);
1192 ++rx_pending;
1193 }
1194 }
1195 efx_for_each_tx_queue(tx_queue, efx) {
1196 if (tx_queue->flushed != FLUSH_DONE)
1197 ++tx_pending;
1198 }
1199
1200 if (rx_pending == 0 && tx_pending == 0)
1201 return 0;
1202
1203 msleep(EFX_FLUSH_INTERVAL);
1204 efx_poll_flush_events(efx);
1205 }
1206
1207 /* Mark the queues as all flushed. We're going to return failure
1208 * leading to a reset, or fake up success anyway */
1209 efx_for_each_tx_queue(tx_queue, efx) {
1210 if (tx_queue->flushed != FLUSH_DONE)
1211 EFX_ERR(efx, "tx queue %d flush command timed out\n",
1212 tx_queue->queue);
1213 tx_queue->flushed = FLUSH_DONE;
1214 }
1215 efx_for_each_rx_queue(rx_queue, efx) {
1216 if (rx_queue->flushed != FLUSH_DONE)
1217 EFX_ERR(efx, "rx queue %d flush command timed out\n",
1218 rx_queue->queue);
1219 rx_queue->flushed = FLUSH_DONE;
1220 }
1221
1222 if (EFX_WORKAROUND_7803(efx))
1223 return 0;
1224
1225 return -ETIMEDOUT;
1226}
1227
1228/**************************************************************************
1229 *
1230 * Hardware interrupts
1231 * The hardware interrupt handler does very little work; all the event
1232 * queue processing is carried out by per-channel tasklets.
1233 *
1234 **************************************************************************/
1235
1236/* Enable/disable/generate interrupts */
1237static inline void efx_nic_interrupts(struct efx_nic *efx,
1238 bool enabled, bool force)
1239{
1240 efx_oword_t int_en_reg_ker;
8880f4ec
BH		 1241
1242 EFX_POPULATE_OWORD_3(int_en_reg_ker,
63695459 1243 FRF_AZ_KER_INT_LEVE_SEL, efx->fatal_irq_level,
8e730c15
BH		 1244 FRF_AZ_KER_INT_KER, force,
1245 FRF_AZ_DRV_INT_EN_KER, enabled);
1246 efx_writeo(efx, &int_en_reg_ker, FR_AZ_INT_EN_KER);
1247}
1248
1249void efx_nic_enable_interrupts(struct efx_nic *efx)
1250{
1251 struct efx_channel *channel;
1252
1253 EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr));
1254 wmb(); /* Ensure interrupt vector is clear before interrupts enabled */
1255
1256 /* Enable interrupts */
1257 efx_nic_interrupts(efx, true, false);
1258
1259 /* Force processing of all the channels to get the EVQ RPTRs up to
1260 date */
1261 efx_for_each_channel(channel, efx)
1262 efx_schedule_channel(channel);
1263}
1264
1265void efx_nic_disable_interrupts(struct efx_nic *efx)
1266{
1267 /* Disable interrupts */
1268 efx_nic_interrupts(efx, false, false);
1269}
1270
1271/* Generate a test interrupt
1272 * Interrupt must already have been enabled, otherwise nasty things
1273 * may happen.
1274 */
1275void efx_nic_generate_interrupt(struct efx_nic *efx)
1276{
1277 efx_nic_interrupts(efx, true, true);
1278}
1279
1280/* Process a fatal interrupt
1281 * Disable bus mastering ASAP and schedule a reset
1282 */
1283irqreturn_t efx_nic_fatal_interrupt(struct efx_nic *efx)
1284{
1285 struct falcon_nic_data *nic_data = efx->nic_data;
1286 efx_oword_t *int_ker = efx->irq_status.addr;
1287 efx_oword_t fatal_intr;
1288 int error, mem_perr;
1289
1290 efx_reado(efx, &fatal_intr, FR_AZ_FATAL_INTR_KER);
1291 error = EFX_OWORD_FIELD(fatal_intr, FRF_AZ_FATAL_INTR);
1292
1293 EFX_ERR(efx, "SYSTEM ERROR " EFX_OWORD_FMT " status "
1294 EFX_OWORD_FMT ": %s\n", EFX_OWORD_VAL(*int_ker),
1295 EFX_OWORD_VAL(fatal_intr),
1296 error ? "disabling bus mastering" : "no recognised error");
8e730c15
BH		 1297
1298 /* If this is a memory parity error dump which blocks are offending */
97e1eaa0
SH		 1299 mem_perr = (EFX_OWORD_FIELD(fatal_intr, FRF_AZ_MEM_PERR_INT_KER) ||
1300 EFX_OWORD_FIELD(fatal_intr, FRF_AZ_SRM_PERR_INT_KER));
8e730c15
BH		 1301 if (mem_perr) {
1302 efx_oword_t reg;
1303 efx_reado(efx, &reg, FR_AZ_MEM_STAT);
1304 EFX_ERR(efx, "SYSTEM ERROR: memory parity error "
1305 EFX_OWORD_FMT "\n", EFX_OWORD_VAL(reg));
1306 }
1307
1308 /* Disable both devices */
1309 pci_clear_master(efx->pci_dev);
1310 if (efx_nic_is_dual_func(efx))
1311 pci_clear_master(nic_data->pci_dev2);
1312 efx_nic_disable_interrupts(efx);
1313
1314 /* Count errors and reset or disable the NIC accordingly */
1315 if (efx->int_error_count == 0 ||
1316 time_after(jiffies, efx->int_error_expire)) {
1317 efx->int_error_count = 0;
1318 efx->int_error_expire =
1319 jiffies + EFX_INT_ERROR_EXPIRE * HZ;
1320 }
1321 if (++efx->int_error_count < EFX_MAX_INT_ERRORS) {
1322 EFX_ERR(efx, "SYSTEM ERROR - reset scheduled\n");
1323 efx_schedule_reset(efx, RESET_TYPE_INT_ERROR);
1324 } else {
1325 EFX_ERR(efx, "SYSTEM ERROR - max number of errors seen."
1326 "NIC will be disabled\n");
1327 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
1328 }
63695459 1329
8e730c15
BH		 1330 return IRQ_HANDLED;
1331}
1332
1333/* Handle a legacy interrupt
1334 * Acknowledges the interrupt and schedule event queue processing.
1335 */
1336static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id)
1337{
1338 struct efx_nic *efx = dev_id;
1339 efx_oword_t *int_ker = efx->irq_status.addr;
1340 irqreturn_t result = IRQ_NONE;
1341 struct efx_channel *channel;
1342 efx_dword_t reg;
1343 u32 queues;
1344 int syserr;
1345
1346 /* Read the ISR which also ACKs the interrupts */
1347 efx_readd(efx, &reg, FR_BZ_INT_ISR0);
1348 queues = EFX_EXTRACT_DWORD(reg, 0, 31);
1349
1350 /* Check to see if we have a serious error condition */
63695459
SH		 1351 if (queues & (1U << efx->fatal_irq_level)) {
1352 syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
1353 if (unlikely(syserr))
1354 return efx_nic_fatal_interrupt(efx);
1355 }
8e730c15 1356
8880f4ec
BH		 1357 if (queues != 0) {
1358 if (EFX_WORKAROUND_15783(efx))
1359 efx->irq_zero_count = 0;
1360
1361 /* Schedule processing of any interrupting queues */
1362 efx_for_each_channel(channel, efx) {
1363 if (queues & 1)
8e730c15 1364 efx_schedule_channel(channel);
8880f4ec 1365 queues >>= 1;
8e730c15 1366 }
8880f4ec
BH		 1367 result = IRQ_HANDLED;
1368
41b7e4c3 1369 } else if (EFX_WORKAROUND_15783(efx)) {
8880f4ec
BH		 1370 efx_qword_t *event;
1371
41b7e4c3
SH		 1372 /* We can't return IRQ_HANDLED more than once on seeing ISR=0
1373 * because this might be a shared interrupt. */
1374 if (efx->irq_zero_count++ == 0)
1375 result = IRQ_HANDLED;
1376
1377 /* Ensure we schedule or rearm all event queues */
8880f4ec
BH		 1378 efx_for_each_channel(channel, efx) {
1379 event = efx_event(channel, channel->eventq_read_ptr);
1380 if (efx_event_present(event))
1381 efx_schedule_channel(channel);
41b7e4c3
SH		 1382 else
1383 efx_nic_eventq_read_ack(channel);
8880f4ec 1384 }
8e730c15
BH		 1385 }
1386
1387 if (result == IRQ_HANDLED) {
1388 efx->last_irq_cpu = raw_smp_processor_id();
1389 EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
1390 irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
1391 }
1392
1393 return result;
1394}
1395
1396/* Handle an MSI interrupt
1397 *
1398 * Handle an MSI hardware interrupt. This routine schedules event
1399 * queue processing. No interrupt acknowledgement cycle is necessary.
1400 * Also, we never need to check that the interrupt is for us, since
1401 * MSI interrupts cannot be shared.
1402 */
1403static irqreturn_t efx_msi_interrupt(int irq, void *dev_id)
1404{
1405 struct efx_channel *channel = dev_id;
1406 struct efx_nic *efx = channel->efx;
1407 efx_oword_t *int_ker = efx->irq_status.addr;
1408 int syserr;
1409
1410 efx->last_irq_cpu = raw_smp_processor_id();
1411 EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
1412 irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
1413
1414 /* Check to see if we have a serious error condition */
63695459
SH		 1415 if (channel->channel == efx->fatal_irq_level) {
1416 syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
1417 if (unlikely(syserr))
1418 return efx_nic_fatal_interrupt(efx);
1419 }
8e730c15
BH		 1420
1421 /* Schedule processing of the channel */
1422 efx_schedule_channel(channel);
1423
1424 return IRQ_HANDLED;
1425}
1426
1427
1428/* Setup RSS indirection table.
1429 * This maps from the hash value of the packet to RXQ
1430 */
1431static void efx_setup_rss_indir_table(struct efx_nic *efx)
1432{
1433 int i = 0;
1434 unsigned long offset;
1435 efx_dword_t dword;
1436
1437 if (efx_nic_rev(efx) < EFX_REV_FALCON_B0)
1438 return;
1439
1440 for (offset = FR_BZ_RX_INDIRECTION_TBL;
1441 offset < FR_BZ_RX_INDIRECTION_TBL + 0x800;
1442 offset += 0x10) {
1443 EFX_POPULATE_DWORD_1(dword, FRF_BZ_IT_QUEUE,
1444 i % efx->n_rx_queues);
1445 efx_writed(efx, &dword, offset);
1446 i++;
1447 }
1448}
1449
1450/* Hook interrupt handler(s)
1451 * Try MSI and then legacy interrupts.
1452 */
1453int efx_nic_init_interrupt(struct efx_nic *efx)
1454{
1455 struct efx_channel *channel;
1456 int rc;
1457
1458 if (!EFX_INT_MODE_USE_MSI(efx)) {
1459 irq_handler_t handler;
1460 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
1461 handler = efx_legacy_interrupt;
1462 else
1463 handler = falcon_legacy_interrupt_a1;
1464
1465 rc = request_irq(efx->legacy_irq, handler, IRQF_SHARED,
1466 efx->name, efx);
1467 if (rc) {
1468 EFX_ERR(efx, "failed to hook legacy IRQ %d\n",
1469 efx->pci_dev->irq);
1470 goto fail1;
1471 }
1472 return 0;
1473 }
1474
1475 /* Hook MSI or MSI-X interrupt */
1476 efx_for_each_channel(channel, efx) {
1477 rc = request_irq(channel->irq, efx_msi_interrupt,
1478 IRQF_PROBE_SHARED, /* Not shared */
1479 channel->name, channel);
1480 if (rc) {
1481 EFX_ERR(efx, "failed to hook IRQ %d\n", channel->irq);
1482 goto fail2;
1483 }
1484 }
1485
1486 return 0;
1487
1488 fail2:
1489 efx_for_each_channel(channel, efx)
1490 free_irq(channel->irq, channel);
1491 fail1:
1492 return rc;
1493}
1494
1495void efx_nic_fini_interrupt(struct efx_nic *efx)
1496{
1497 struct efx_channel *channel;
1498 efx_oword_t reg;
1499
1500 /* Disable MSI/MSI-X interrupts */
1501 efx_for_each_channel(channel, efx) {
1502 if (channel->irq)
1503 free_irq(channel->irq, channel);
1504 }
1505
1506 /* ACK legacy interrupt */
1507 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
1508 efx_reado(efx, &reg, FR_BZ_INT_ISR0);
1509 else
1510 falcon_irq_ack_a1(efx);
1511
1512 /* Disable legacy interrupt */
1513 if (efx->legacy_irq)
1514 free_irq(efx->legacy_irq, efx);
1515}
1516
1517u32 efx_nic_fpga_ver(struct efx_nic *efx)
1518{
1519 efx_oword_t altera_build;
1520 efx_reado(efx, &altera_build, FR_AZ_ALTERA_BUILD);
1521 return EFX_OWORD_FIELD(altera_build, FRF_AZ_ALTERA_BUILD_VER);
1522}
1523
1524void efx_nic_init_common(struct efx_nic *efx)
1525{
1526 efx_oword_t temp;
1527
1528 /* Set positions of descriptor caches in SRAM. */
1529 EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_TX_DC_BASE_ADR,
1530 efx->type->tx_dc_base / 8);
1531 efx_writeo(efx, &temp, FR_AZ_SRM_TX_DC_CFG);
1532 EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_RX_DC_BASE_ADR,
1533 efx->type->rx_dc_base / 8);
1534 efx_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG);
1535
1536 /* Set TX descriptor cache size. */
1537 BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER));
1538 EFX_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
1539 efx_writeo(efx, &temp, FR_AZ_TX_DC_CFG);
1540
1541 /* Set RX descriptor cache size. Set low watermark to size-8, as
1542 * this allows most efficient prefetching.
1543 */
1544 BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER));
1545 EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
1546 efx_writeo(efx, &temp, FR_AZ_RX_DC_CFG);
1547 EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8);
1548 efx_writeo(efx, &temp, FR_AZ_RX_DC_PF_WM);
1549
1550 /* Program INT_KER address */
1551 EFX_POPULATE_OWORD_2(temp,
1552 FRF_AZ_NORM_INT_VEC_DIS_KER,
1553 EFX_INT_MODE_USE_MSI(efx),
1554 FRF_AZ_INT_ADR_KER, efx->irq_status.dma_addr);
1555 efx_writeo(efx, &temp, FR_AZ_INT_ADR_KER);
1556
63695459
SH		 1557 if (EFX_WORKAROUND_17213(efx) && !EFX_INT_MODE_USE_MSI(efx))
1558 /* Use an interrupt level unused by event queues */
1559 efx->fatal_irq_level = 0x1f;
1560 else
1561 /* Use a valid MSI-X vector */
1562 efx->fatal_irq_level = 0;
1563
8e730c15
BH		 1564 /* Enable all the genuinely fatal interrupts. (They are still
1565 * masked by the overall interrupt mask, controlled by
1566 * falcon_interrupts()).
1567 *
1568 * Note: All other fatal interrupts are enabled
1569 */
1570 EFX_POPULATE_OWORD_3(temp,
1571 FRF_AZ_ILL_ADR_INT_KER_EN, 1,
1572 FRF_AZ_RBUF_OWN_INT_KER_EN, 1,
1573 FRF_AZ_TBUF_OWN_INT_KER_EN, 1);
b17424b0
SH		 1574 if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0)
1575 EFX_SET_OWORD_FIELD(temp, FRF_CZ_SRAM_PERR_INT_P_KER_EN, 1);
8e730c15
BH		 1576 EFX_INVERT_OWORD(temp);
1577 efx_writeo(efx, &temp, FR_AZ_FATAL_INTR_KER);
1578
1579 efx_setup_rss_indir_table(efx);
1580
1581 /* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be
1582 * controlled by the RX FIFO fill level. Set arbitration to one pkt/Q.
1583 */
1584 efx_reado(efx, &temp, FR_AZ_TX_RESERVED);
1585 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER, 0xfe);
1586 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER_EN, 1);
1587 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_ONE_PKT_PER_Q, 1);
1588 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PUSH_EN, 0);
1589 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_DIS_NON_IP_EV, 1);
1590 /* Enable SW_EV to inherit in char driver - assume harmless here */
1591 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1);
1592 /* Prefetch threshold 2 => fetch when descriptor cache half empty */
1593 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2);
286d47ba
BH		 1594 /* Disable hardware watchdog which can misfire */
1595 EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_WD_TMR, 0x3fffff);
8e730c15
BH		 1596 /* Squash TX of packets of 16 bytes or less */
1597 if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
1598 EFX_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1);
1599 efx_writeo(efx, &temp, FR_AZ_TX_RESERVED);
1600}
Clone of davem's net-next-2.6 tree