1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2006-2013 Solarflare Communications Inc.
6 */
7
8 #include <linux/bitops.h>
9 #include <linux/delay.h>
10 #include <linux/interrupt.h>
11 #include <linux/pci.h>
12 #include <linux/module.h>
13 #include <linux/seq_file.h>
14 #include <linux/crc32.h>
15 #include "net_driver.h"
16 #include "bitfield.h"
17 #include "efx.h"
18 #include "nic.h"
19 #include "farch_regs.h"
20 #include "io.h"
21 #include "workarounds.h"
22
23 /* Falcon-architecture (SFC4000) support */
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
45 /* If EF4_MAX_INT_ERRORS internal errors occur within
46 * EF4_INT_ERROR_EXPIRE seconds, we consider the NIC broken and
47 * disable it.
48 */
49 #define EF4_INT_ERROR_EXPIRE 3600
50 #define EF4_MAX_INT_ERRORS 5
51
52 /* Depth of RX flush request fifo */
53 #define EF4_RX_FLUSH_COUNT 4
54
55 /* Driver generated events */
56 #define _EF4_CHANNEL_MAGIC_TEST 0x000101
57 #define _EF4_CHANNEL_MAGIC_FILL 0x000102
58 #define _EF4_CHANNEL_MAGIC_RX_DRAIN 0x000103
59 #define _EF4_CHANNEL_MAGIC_TX_DRAIN 0x000104
60
61 #define _EF4_CHANNEL_MAGIC(_code, _data) ((_code) << 8 | (_data))
62 #define _EF4_CHANNEL_MAGIC_CODE(_magic) ((_magic) >> 8)
63
64 #define EF4_CHANNEL_MAGIC_TEST(_channel) \
65 _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_TEST, (_channel)->channel)
66 #define EF4_CHANNEL_MAGIC_FILL(_rx_queue) \
67 _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_FILL, \
68 ef4_rx_queue_index(_rx_queue))
69 #define EF4_CHANNEL_MAGIC_RX_DRAIN(_rx_queue) \
70 _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_RX_DRAIN, \
71 ef4_rx_queue_index(_rx_queue))
72 #define EF4_CHANNEL_MAGIC_TX_DRAIN(_tx_queue) \
73 _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_TX_DRAIN, \
74 (_tx_queue)->queue)
75
76 static void ef4_farch_magic_event(struct ef4_channel *channel, u32 magic);
77
78 /**************************************************************************
79 *
80 * Hardware access
81 *
82 **************************************************************************/
83
ef4_write_buf_tbl(struct ef4_nic * efx,ef4_qword_t * value,unsigned int index)84 static inline void ef4_write_buf_tbl(struct ef4_nic *efx, ef4_qword_t *value,
85 unsigned int index)
86 {
87 ef4_sram_writeq(efx, efx->membase + efx->type->buf_tbl_base,
88 value, index);
89 }
90
ef4_masked_compare_oword(const ef4_oword_t * a,const ef4_oword_t * b,const ef4_oword_t * mask)91 static bool ef4_masked_compare_oword(const ef4_oword_t *a, const ef4_oword_t *b,
92 const ef4_oword_t *mask)
93 {
94 return ((a->u64[0] ^ b->u64[0]) & mask->u64[0]) ||
95 ((a->u64[1] ^ b->u64[1]) & mask->u64[1]);
96 }
97
ef4_farch_test_registers(struct ef4_nic * efx,const struct ef4_farch_register_test * regs,size_t n_regs)98 int ef4_farch_test_registers(struct ef4_nic *efx,
99 const struct ef4_farch_register_test *regs,
100 size_t n_regs)
101 {
102 unsigned address = 0;
103 int i, j;
104 ef4_oword_t mask, imask, original, reg, buf;
105
106 for (i = 0; i < n_regs; ++i) {
107 address = regs[i].address;
108 mask = imask = regs[i].mask;
109 EF4_INVERT_OWORD(imask);
110
111 ef4_reado(efx, &original, address);
112
113 /* bit sweep on and off */
114 for (j = 0; j < 128; j++) {
115 if (!EF4_EXTRACT_OWORD32(mask, j, j))
116 continue;
117
118 /* Test this testable bit can be set in isolation */
119 EF4_AND_OWORD(reg, original, mask);
120 EF4_SET_OWORD32(reg, j, j, 1);
121
122 ef4_writeo(efx, ®, address);
123 ef4_reado(efx, &buf, address);
124
125 if (ef4_masked_compare_oword(®, &buf, &mask))
126 goto fail;
127
128 /* Test this testable bit can be cleared in isolation */
129 EF4_OR_OWORD(reg, original, mask);
130 EF4_SET_OWORD32(reg, j, j, 0);
131
132 ef4_writeo(efx, ®, address);
133 ef4_reado(efx, &buf, address);
134
135 if (ef4_masked_compare_oword(®, &buf, &mask))
136 goto fail;
137 }
138
139 ef4_writeo(efx, &original, address);
140 }
141
142 return 0;
143
144 fail:
145 netif_err(efx, hw, efx->net_dev,
146 "wrote "EF4_OWORD_FMT" read "EF4_OWORD_FMT
147 " at address 0x%x mask "EF4_OWORD_FMT"\n", EF4_OWORD_VAL(reg),
148 EF4_OWORD_VAL(buf), address, EF4_OWORD_VAL(mask));
149 return -EIO;
150 }
151
152 /**************************************************************************
153 *
154 * Special buffer handling
155 * Special buffers are used for event queues and the TX and RX
156 * descriptor rings.
157 *
158 *************************************************************************/
159
160 /*
161 * Initialise a special buffer
162 *
163 * This will define a buffer (previously allocated via
164 * ef4_alloc_special_buffer()) in the buffer table, allowing
165 * it to be used for event queues, descriptor rings etc.
166 */
167 static void
ef4_init_special_buffer(struct ef4_nic * efx,struct ef4_special_buffer * buffer)168 ef4_init_special_buffer(struct ef4_nic *efx, struct ef4_special_buffer *buffer)
169 {
170 ef4_qword_t buf_desc;
171 unsigned int index;
172 dma_addr_t dma_addr;
173 int i;
174
175 EF4_BUG_ON_PARANOID(!buffer->buf.addr);
176
177 /* Write buffer descriptors to NIC */
178 for (i = 0; i < buffer->entries; i++) {
179 index = buffer->index + i;
180 dma_addr = buffer->buf.dma_addr + (i * EF4_BUF_SIZE);
181 netif_dbg(efx, probe, efx->net_dev,
182 "mapping special buffer %d at %llx\n",
183 index, (unsigned long long)dma_addr);
184 EF4_POPULATE_QWORD_3(buf_desc,
185 FRF_AZ_BUF_ADR_REGION, 0,
186 FRF_AZ_BUF_ADR_FBUF, dma_addr >> 12,
187 FRF_AZ_BUF_OWNER_ID_FBUF, 0);
188 ef4_write_buf_tbl(efx, &buf_desc, index);
189 }
190 }
191
192 /* Unmaps a buffer and clears the buffer table entries */
193 static void
ef4_fini_special_buffer(struct ef4_nic * efx,struct ef4_special_buffer * buffer)194 ef4_fini_special_buffer(struct ef4_nic *efx, struct ef4_special_buffer *buffer)
195 {
196 ef4_oword_t buf_tbl_upd;
197 unsigned int start = buffer->index;
198 unsigned int end = (buffer->index + buffer->entries - 1);
199
200 if (!buffer->entries)
201 return;
202
203 netif_dbg(efx, hw, efx->net_dev, "unmapping special buffers %d-%d\n",
204 buffer->index, buffer->index + buffer->entries - 1);
205
206 EF4_POPULATE_OWORD_4(buf_tbl_upd,
207 FRF_AZ_BUF_UPD_CMD, 0,
208 FRF_AZ_BUF_CLR_CMD, 1,
209 FRF_AZ_BUF_CLR_END_ID, end,
210 FRF_AZ_BUF_CLR_START_ID, start);
211 ef4_writeo(efx, &buf_tbl_upd, FR_AZ_BUF_TBL_UPD);
212 }
213
214 /*
215 * Allocate a new special buffer
216 *
217 * This allocates memory for a new buffer, clears it and allocates a
218 * new buffer ID range. It does not write into the buffer table.
219 *
220 * This call will allocate 4KB buffers, since 8KB buffers can't be
221 * used for event queues and descriptor rings.
222 */
ef4_alloc_special_buffer(struct ef4_nic * efx,struct ef4_special_buffer * buffer,unsigned int len)223 static int ef4_alloc_special_buffer(struct ef4_nic *efx,
224 struct ef4_special_buffer *buffer,
225 unsigned int len)
226 {
227 len = ALIGN(len, EF4_BUF_SIZE);
228
229 if (ef4_nic_alloc_buffer(efx, &buffer->buf, len, GFP_KERNEL))
230 return -ENOMEM;
231 buffer->entries = len / EF4_BUF_SIZE;
232 BUG_ON(buffer->buf.dma_addr & (EF4_BUF_SIZE - 1));
233
234 /* Select new buffer ID */
235 buffer->index = efx->next_buffer_table;
236 efx->next_buffer_table += buffer->entries;
237
238 netif_dbg(efx, probe, efx->net_dev,
239 "allocating special buffers %d-%d at %llx+%x "
240 "(virt %p phys %llx)\n", buffer->index,
241 buffer->index + buffer->entries - 1,
242 (u64)buffer->buf.dma_addr, len,
243 buffer->buf.addr, (u64)virt_to_phys(buffer->buf.addr));
244
245 return 0;
246 }
247
248 static void
ef4_free_special_buffer(struct ef4_nic * efx,struct ef4_special_buffer * buffer)249 ef4_free_special_buffer(struct ef4_nic *efx, struct ef4_special_buffer *buffer)
250 {
251 if (!buffer->buf.addr)
252 return;
253
254 netif_dbg(efx, hw, efx->net_dev,
255 "deallocating special buffers %d-%d at %llx+%x "
256 "(virt %p phys %llx)\n", buffer->index,
257 buffer->index + buffer->entries - 1,
258 (u64)buffer->buf.dma_addr, buffer->buf.len,
259 buffer->buf.addr, (u64)virt_to_phys(buffer->buf.addr));
260
261 ef4_nic_free_buffer(efx, &buffer->buf);
262 buffer->entries = 0;
263 }
264
265 /**************************************************************************
266 *
267 * TX path
268 *
269 **************************************************************************/
270
271 /* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */
ef4_farch_notify_tx_desc(struct ef4_tx_queue * tx_queue)272 static inline void ef4_farch_notify_tx_desc(struct ef4_tx_queue *tx_queue)
273 {
274 unsigned write_ptr;
275 ef4_dword_t reg;
276
277 write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
278 EF4_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr);
279 ef4_writed_page(tx_queue->efx, ®,
280 FR_AZ_TX_DESC_UPD_DWORD_P0, tx_queue->queue);
281 }
282
283 /* Write pointer and first descriptor for TX descriptor ring */
ef4_farch_push_tx_desc(struct ef4_tx_queue * tx_queue,const ef4_qword_t * txd)284 static inline void ef4_farch_push_tx_desc(struct ef4_tx_queue *tx_queue,
285 const ef4_qword_t *txd)
286 {
287 unsigned write_ptr;
288 ef4_oword_t reg;
289
290 BUILD_BUG_ON(FRF_AZ_TX_DESC_LBN != 0);
291 BUILD_BUG_ON(FR_AA_TX_DESC_UPD_KER != FR_BZ_TX_DESC_UPD_P0);
292
293 write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
294 EF4_POPULATE_OWORD_2(reg, FRF_AZ_TX_DESC_PUSH_CMD, true,
295 FRF_AZ_TX_DESC_WPTR, write_ptr);
296 reg.qword[0] = *txd;
297 ef4_writeo_page(tx_queue->efx, ®,
298 FR_BZ_TX_DESC_UPD_P0, tx_queue->queue);
299 }
300
301
302 /* For each entry inserted into the software descriptor ring, create a
303 * descriptor in the hardware TX descriptor ring (in host memory), and
304 * write a doorbell.
305 */
ef4_farch_tx_write(struct ef4_tx_queue * tx_queue)306 void ef4_farch_tx_write(struct ef4_tx_queue *tx_queue)
307 {
308 struct ef4_tx_buffer *buffer;
309 ef4_qword_t *txd;
310 unsigned write_ptr;
311 unsigned old_write_count = tx_queue->write_count;
312
313 tx_queue->xmit_more_available = false;
314 if (unlikely(tx_queue->write_count == tx_queue->insert_count))
315 return;
316
317 do {
318 write_ptr = tx_queue->write_count & tx_queue->ptr_mask;
319 buffer = &tx_queue->buffer[write_ptr];
320 txd = ef4_tx_desc(tx_queue, write_ptr);
321 ++tx_queue->write_count;
322
323 EF4_BUG_ON_PARANOID(buffer->flags & EF4_TX_BUF_OPTION);
324
325 /* Create TX descriptor ring entry */
326 BUILD_BUG_ON(EF4_TX_BUF_CONT != 1);
327 EF4_POPULATE_QWORD_4(*txd,
328 FSF_AZ_TX_KER_CONT,
329 buffer->flags & EF4_TX_BUF_CONT,
330 FSF_AZ_TX_KER_BYTE_COUNT, buffer->len,
331 FSF_AZ_TX_KER_BUF_REGION, 0,
332 FSF_AZ_TX_KER_BUF_ADDR, buffer->dma_addr);
333 } while (tx_queue->write_count != tx_queue->insert_count);
334
335 wmb(); /* Ensure descriptors are written before they are fetched */
336
337 if (ef4_nic_may_push_tx_desc(tx_queue, old_write_count)) {
338 txd = ef4_tx_desc(tx_queue,
339 old_write_count & tx_queue->ptr_mask);
340 ef4_farch_push_tx_desc(tx_queue, txd);
341 ++tx_queue->pushes;
342 } else {
343 ef4_farch_notify_tx_desc(tx_queue);
344 }
345 }
346
ef4_farch_tx_limit_len(struct ef4_tx_queue * tx_queue,dma_addr_t dma_addr,unsigned int len)347 unsigned int ef4_farch_tx_limit_len(struct ef4_tx_queue *tx_queue,
348 dma_addr_t dma_addr, unsigned int len)
349 {
350 /* Don't cross 4K boundaries with descriptors. */
351 unsigned int limit = (~dma_addr & (EF4_PAGE_SIZE - 1)) + 1;
352
353 len = min(limit, len);
354
355 if (EF4_WORKAROUND_5391(tx_queue->efx) && (dma_addr & 0xf))
356 len = min_t(unsigned int, len, 512 - (dma_addr & 0xf));
357
358 return len;
359 }
360
361
362 /* Allocate hardware resources for a TX queue */
ef4_farch_tx_probe(struct ef4_tx_queue * tx_queue)363 int ef4_farch_tx_probe(struct ef4_tx_queue *tx_queue)
364 {
365 struct ef4_nic *efx = tx_queue->efx;
366 unsigned entries;
367
368 entries = tx_queue->ptr_mask + 1;
369 return ef4_alloc_special_buffer(efx, &tx_queue->txd,
370 entries * sizeof(ef4_qword_t));
371 }
372
ef4_farch_tx_init(struct ef4_tx_queue * tx_queue)373 void ef4_farch_tx_init(struct ef4_tx_queue *tx_queue)
374 {
375 struct ef4_nic *efx = tx_queue->efx;
376 ef4_oword_t reg;
377
378 /* Pin TX descriptor ring */
379 ef4_init_special_buffer(efx, &tx_queue->txd);
380
381 /* Push TX descriptor ring to card */
382 EF4_POPULATE_OWORD_10(reg,
383 FRF_AZ_TX_DESCQ_EN, 1,
384 FRF_AZ_TX_ISCSI_DDIG_EN, 0,
385 FRF_AZ_TX_ISCSI_HDIG_EN, 0,
386 FRF_AZ_TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index,
387 FRF_AZ_TX_DESCQ_EVQ_ID,
388 tx_queue->channel->channel,
389 FRF_AZ_TX_DESCQ_OWNER_ID, 0,
390 FRF_AZ_TX_DESCQ_LABEL, tx_queue->queue,
391 FRF_AZ_TX_DESCQ_SIZE,
392 __ffs(tx_queue->txd.entries),
393 FRF_AZ_TX_DESCQ_TYPE, 0,
394 FRF_BZ_TX_NON_IP_DROP_DIS, 1);
395
396 if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) {
397 int csum = tx_queue->queue & EF4_TXQ_TYPE_OFFLOAD;
398 EF4_SET_OWORD_FIELD(reg, FRF_BZ_TX_IP_CHKSM_DIS, !csum);
399 EF4_SET_OWORD_FIELD(reg, FRF_BZ_TX_TCP_CHKSM_DIS,
400 !csum);
401 }
402
403 ef4_writeo_table(efx, ®, efx->type->txd_ptr_tbl_base,
404 tx_queue->queue);
405
406 if (ef4_nic_rev(efx) < EF4_REV_FALCON_B0) {
407 /* Only 128 bits in this register */
408 BUILD_BUG_ON(EF4_MAX_TX_QUEUES > 128);
409
410 ef4_reado(efx, ®, FR_AA_TX_CHKSM_CFG);
411 if (tx_queue->queue & EF4_TXQ_TYPE_OFFLOAD)
412 __clear_bit_le(tx_queue->queue, ®);
413 else
414 __set_bit_le(tx_queue->queue, ®);
415 ef4_writeo(efx, ®, FR_AA_TX_CHKSM_CFG);
416 }
417
418 if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) {
419 EF4_POPULATE_OWORD_1(reg,
420 FRF_BZ_TX_PACE,
421 (tx_queue->queue & EF4_TXQ_TYPE_HIGHPRI) ?
422 FFE_BZ_TX_PACE_OFF :
423 FFE_BZ_TX_PACE_RESERVED);
424 ef4_writeo_table(efx, ®, FR_BZ_TX_PACE_TBL,
425 tx_queue->queue);
426 }
427 }
428
ef4_farch_flush_tx_queue(struct ef4_tx_queue * tx_queue)429 static void ef4_farch_flush_tx_queue(struct ef4_tx_queue *tx_queue)
430 {
431 struct ef4_nic *efx = tx_queue->efx;
432 ef4_oword_t tx_flush_descq;
433
434 WARN_ON(atomic_read(&tx_queue->flush_outstanding));
435 atomic_set(&tx_queue->flush_outstanding, 1);
436
437 EF4_POPULATE_OWORD_2(tx_flush_descq,
438 FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
439 FRF_AZ_TX_FLUSH_DESCQ, tx_queue->queue);
440 ef4_writeo(efx, &tx_flush_descq, FR_AZ_TX_FLUSH_DESCQ);
441 }
442
ef4_farch_tx_fini(struct ef4_tx_queue * tx_queue)443 void ef4_farch_tx_fini(struct ef4_tx_queue *tx_queue)
444 {
445 struct ef4_nic *efx = tx_queue->efx;
446 ef4_oword_t tx_desc_ptr;
447
448 /* Remove TX descriptor ring from card */
449 EF4_ZERO_OWORD(tx_desc_ptr);
450 ef4_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
451 tx_queue->queue);
452
453 /* Unpin TX descriptor ring */
454 ef4_fini_special_buffer(efx, &tx_queue->txd);
455 }
456
457 /* Free buffers backing TX queue */
ef4_farch_tx_remove(struct ef4_tx_queue * tx_queue)458 void ef4_farch_tx_remove(struct ef4_tx_queue *tx_queue)
459 {
460 ef4_free_special_buffer(tx_queue->efx, &tx_queue->txd);
461 }
462
463 /**************************************************************************
464 *
465 * RX path
466 *
467 **************************************************************************/
468
469 /* This creates an entry in the RX descriptor queue */
470 static inline void
ef4_farch_build_rx_desc(struct ef4_rx_queue * rx_queue,unsigned index)471 ef4_farch_build_rx_desc(struct ef4_rx_queue *rx_queue, unsigned index)
472 {
473 struct ef4_rx_buffer *rx_buf;
474 ef4_qword_t *rxd;
475
476 rxd = ef4_rx_desc(rx_queue, index);
477 rx_buf = ef4_rx_buffer(rx_queue, index);
478 EF4_POPULATE_QWORD_3(*rxd,
479 FSF_AZ_RX_KER_BUF_SIZE,
480 rx_buf->len -
481 rx_queue->efx->type->rx_buffer_padding,
482 FSF_AZ_RX_KER_BUF_REGION, 0,
483 FSF_AZ_RX_KER_BUF_ADDR, rx_buf->dma_addr);
484 }
485
486 /* This writes to the RX_DESC_WPTR register for the specified receive
487 * descriptor ring.
488 */
ef4_farch_rx_write(struct ef4_rx_queue * rx_queue)489 void ef4_farch_rx_write(struct ef4_rx_queue *rx_queue)
490 {
491 struct ef4_nic *efx = rx_queue->efx;
492 ef4_dword_t reg;
493 unsigned write_ptr;
494
495 while (rx_queue->notified_count != rx_queue->added_count) {
496 ef4_farch_build_rx_desc(
497 rx_queue,
498 rx_queue->notified_count & rx_queue->ptr_mask);
499 ++rx_queue->notified_count;
500 }
501
502 wmb();
503 write_ptr = rx_queue->added_count & rx_queue->ptr_mask;
504 EF4_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr);
505 ef4_writed_page(efx, ®, FR_AZ_RX_DESC_UPD_DWORD_P0,
506 ef4_rx_queue_index(rx_queue));
507 }
508
ef4_farch_rx_probe(struct ef4_rx_queue * rx_queue)509 int ef4_farch_rx_probe(struct ef4_rx_queue *rx_queue)
510 {
511 struct ef4_nic *efx = rx_queue->efx;
512 unsigned entries;
513
514 entries = rx_queue->ptr_mask + 1;
515 return ef4_alloc_special_buffer(efx, &rx_queue->rxd,
516 entries * sizeof(ef4_qword_t));
517 }
518
ef4_farch_rx_init(struct ef4_rx_queue * rx_queue)519 void ef4_farch_rx_init(struct ef4_rx_queue *rx_queue)
520 {
521 ef4_oword_t rx_desc_ptr;
522 struct ef4_nic *efx = rx_queue->efx;
523 bool is_b0 = ef4_nic_rev(efx) >= EF4_REV_FALCON_B0;
524 bool iscsi_digest_en = is_b0;
525 bool jumbo_en;
526
527 /* For kernel-mode queues in Falcon A1, the JUMBO flag enables
528 * DMA to continue after a PCIe page boundary (and scattering
529 * is not possible). In Falcon B0 and Siena, it enables
530 * scatter.
531 */
532 jumbo_en = !is_b0 || efx->rx_scatter;
533
534 netif_dbg(efx, hw, efx->net_dev,
535 "RX queue %d ring in special buffers %d-%d\n",
536 ef4_rx_queue_index(rx_queue), rx_queue->rxd.index,
537 rx_queue->rxd.index + rx_queue->rxd.entries - 1);
538
539 rx_queue->scatter_n = 0;
540
541 /* Pin RX descriptor ring */
542 ef4_init_special_buffer(efx, &rx_queue->rxd);
543
544 /* Push RX descriptor ring to card */
545 EF4_POPULATE_OWORD_10(rx_desc_ptr,
546 FRF_AZ_RX_ISCSI_DDIG_EN, iscsi_digest_en,
547 FRF_AZ_RX_ISCSI_HDIG_EN, iscsi_digest_en,
548 FRF_AZ_RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index,
549 FRF_AZ_RX_DESCQ_EVQ_ID,
550 ef4_rx_queue_channel(rx_queue)->channel,
551 FRF_AZ_RX_DESCQ_OWNER_ID, 0,
552 FRF_AZ_RX_DESCQ_LABEL,
553 ef4_rx_queue_index(rx_queue),
554 FRF_AZ_RX_DESCQ_SIZE,
555 __ffs(rx_queue->rxd.entries),
556 FRF_AZ_RX_DESCQ_TYPE, 0 /* kernel queue */ ,
557 FRF_AZ_RX_DESCQ_JUMBO, jumbo_en,
558 FRF_AZ_RX_DESCQ_EN, 1);
559 ef4_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
560 ef4_rx_queue_index(rx_queue));
561 }
562
ef4_farch_flush_rx_queue(struct ef4_rx_queue * rx_queue)563 static void ef4_farch_flush_rx_queue(struct ef4_rx_queue *rx_queue)
564 {
565 struct ef4_nic *efx = rx_queue->efx;
566 ef4_oword_t rx_flush_descq;
567
568 EF4_POPULATE_OWORD_2(rx_flush_descq,
569 FRF_AZ_RX_FLUSH_DESCQ_CMD, 1,
570 FRF_AZ_RX_FLUSH_DESCQ,
571 ef4_rx_queue_index(rx_queue));
572 ef4_writeo(efx, &rx_flush_descq, FR_AZ_RX_FLUSH_DESCQ);
573 }
574
ef4_farch_rx_fini(struct ef4_rx_queue * rx_queue)575 void ef4_farch_rx_fini(struct ef4_rx_queue *rx_queue)
576 {
577 ef4_oword_t rx_desc_ptr;
578 struct ef4_nic *efx = rx_queue->efx;
579
580 /* Remove RX descriptor ring from card */
581 EF4_ZERO_OWORD(rx_desc_ptr);
582 ef4_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
583 ef4_rx_queue_index(rx_queue));
584
585 /* Unpin RX descriptor ring */
586 ef4_fini_special_buffer(efx, &rx_queue->rxd);
587 }
588
589 /* Free buffers backing RX queue */
ef4_farch_rx_remove(struct ef4_rx_queue * rx_queue)590 void ef4_farch_rx_remove(struct ef4_rx_queue *rx_queue)
591 {
592 ef4_free_special_buffer(rx_queue->efx, &rx_queue->rxd);
593 }
594
595 /**************************************************************************
596 *
597 * Flush handling
598 *
599 **************************************************************************/
600
601 /* ef4_farch_flush_queues() must be woken up when all flushes are completed,
602 * or more RX flushes can be kicked off.
603 */
ef4_farch_flush_wake(struct ef4_nic * efx)604 static bool ef4_farch_flush_wake(struct ef4_nic *efx)
605 {
606 /* Ensure that all updates are visible to ef4_farch_flush_queues() */
607 smp_mb();
608
609 return (atomic_read(&efx->active_queues) == 0 ||
610 (atomic_read(&efx->rxq_flush_outstanding) < EF4_RX_FLUSH_COUNT
611 && atomic_read(&efx->rxq_flush_pending) > 0));
612 }
613
ef4_check_tx_flush_complete(struct ef4_nic * efx)614 static bool ef4_check_tx_flush_complete(struct ef4_nic *efx)
615 {
616 bool i = true;
617 ef4_oword_t txd_ptr_tbl;
618 struct ef4_channel *channel;
619 struct ef4_tx_queue *tx_queue;
620
621 ef4_for_each_channel(channel, efx) {
622 ef4_for_each_channel_tx_queue(tx_queue, channel) {
623 ef4_reado_table(efx, &txd_ptr_tbl,
624 FR_BZ_TX_DESC_PTR_TBL, tx_queue->queue);
625 if (EF4_OWORD_FIELD(txd_ptr_tbl,
626 FRF_AZ_TX_DESCQ_FLUSH) ||
627 EF4_OWORD_FIELD(txd_ptr_tbl,
628 FRF_AZ_TX_DESCQ_EN)) {
629 netif_dbg(efx, hw, efx->net_dev,
630 "flush did not complete on TXQ %d\n",
631 tx_queue->queue);
632 i = false;
633 } else if (atomic_cmpxchg(&tx_queue->flush_outstanding,
634 1, 0)) {
635 /* The flush is complete, but we didn't
636 * receive a flush completion event
637 */
638 netif_dbg(efx, hw, efx->net_dev,
639 "flush complete on TXQ %d, so drain "
640 "the queue\n", tx_queue->queue);
641 /* Don't need to increment active_queues as it
642 * has already been incremented for the queues
643 * which did not drain
644 */
645 ef4_farch_magic_event(channel,
646 EF4_CHANNEL_MAGIC_TX_DRAIN(
647 tx_queue));
648 }
649 }
650 }
651
652 return i;
653 }
654
655 /* Flush all the transmit queues, and continue flushing receive queues until
656 * they're all flushed. Wait for the DRAIN events to be received so that there
657 * are no more RX and TX events left on any channel. */
ef4_farch_do_flush(struct ef4_nic * efx)658 static int ef4_farch_do_flush(struct ef4_nic *efx)
659 {
660 unsigned timeout = msecs_to_jiffies(5000); /* 5s for all flushes and drains */
661 struct ef4_channel *channel;
662 struct ef4_rx_queue *rx_queue;
663 struct ef4_tx_queue *tx_queue;
664 int rc = 0;
665
666 ef4_for_each_channel(channel, efx) {
667 ef4_for_each_channel_tx_queue(tx_queue, channel) {
668 ef4_farch_flush_tx_queue(tx_queue);
669 }
670 ef4_for_each_channel_rx_queue(rx_queue, channel) {
671 rx_queue->flush_pending = true;
672 atomic_inc(&efx->rxq_flush_pending);
673 }
674 }
675
676 while (timeout && atomic_read(&efx->active_queues) > 0) {
677 /* The hardware supports four concurrent rx flushes, each of
678 * which may need to be retried if there is an outstanding
679 * descriptor fetch
680 */
681 ef4_for_each_channel(channel, efx) {
682 ef4_for_each_channel_rx_queue(rx_queue, channel) {
683 if (atomic_read(&efx->rxq_flush_outstanding) >=
684 EF4_RX_FLUSH_COUNT)
685 break;
686
687 if (rx_queue->flush_pending) {
688 rx_queue->flush_pending = false;
689 atomic_dec(&efx->rxq_flush_pending);
690 atomic_inc(&efx->rxq_flush_outstanding);
691 ef4_farch_flush_rx_queue(rx_queue);
692 }
693 }
694 }
695
696 timeout = wait_event_timeout(efx->flush_wq,
697 ef4_farch_flush_wake(efx),
698 timeout);
699 }
700
701 if (atomic_read(&efx->active_queues) &&
702 !ef4_check_tx_flush_complete(efx)) {
703 netif_err(efx, hw, efx->net_dev, "failed to flush %d queues "
704 "(rx %d+%d)\n", atomic_read(&efx->active_queues),
705 atomic_read(&efx->rxq_flush_outstanding),
706 atomic_read(&efx->rxq_flush_pending));
707 rc = -ETIMEDOUT;
708
709 atomic_set(&efx->active_queues, 0);
710 atomic_set(&efx->rxq_flush_pending, 0);
711 atomic_set(&efx->rxq_flush_outstanding, 0);
712 }
713
714 return rc;
715 }
716
ef4_farch_fini_dmaq(struct ef4_nic * efx)717 int ef4_farch_fini_dmaq(struct ef4_nic *efx)
718 {
719 struct ef4_channel *channel;
720 struct ef4_tx_queue *tx_queue;
721 struct ef4_rx_queue *rx_queue;
722 int rc = 0;
723
724 /* Do not attempt to write to the NIC during EEH recovery */
725 if (efx->state != STATE_RECOVERY) {
726 /* Only perform flush if DMA is enabled */
727 if (efx->pci_dev->is_busmaster) {
728 efx->type->prepare_flush(efx);
729 rc = ef4_farch_do_flush(efx);
730 efx->type->finish_flush(efx);
731 }
732
733 ef4_for_each_channel(channel, efx) {
734 ef4_for_each_channel_rx_queue(rx_queue, channel)
735 ef4_farch_rx_fini(rx_queue);
736 ef4_for_each_channel_tx_queue(tx_queue, channel)
737 ef4_farch_tx_fini(tx_queue);
738 }
739 }
740
741 return rc;
742 }
743
744 /* Reset queue and flush accounting after FLR
745 *
746 * One possible cause of FLR recovery is that DMA may be failing (eg. if bus
747 * mastering was disabled), in which case we don't receive (RXQ) flush
748 * completion events. This means that efx->rxq_flush_outstanding remained at 4
749 * after the FLR; also, efx->active_queues was non-zero (as no flush completion
750 * events were received, and we didn't go through ef4_check_tx_flush_complete())
751 * If we don't fix this up, on the next call to ef4_realloc_channels() we won't
752 * flush any RX queues because efx->rxq_flush_outstanding is at the limit of 4
753 * for batched flush requests; and the efx->active_queues gets messed up because
754 * we keep incrementing for the newly initialised queues, but it never went to
755 * zero previously. Then we get a timeout every time we try to restart the
756 * queues, as it doesn't go back to zero when we should be flushing the queues.
757 */
ef4_farch_finish_flr(struct ef4_nic * efx)758 void ef4_farch_finish_flr(struct ef4_nic *efx)
759 {
760 atomic_set(&efx->rxq_flush_pending, 0);
761 atomic_set(&efx->rxq_flush_outstanding, 0);
762 atomic_set(&efx->active_queues, 0);
763 }
764
765
766 /**************************************************************************
767 *
768 * Event queue processing
769 * Event queues are processed by per-channel tasklets.
770 *
771 **************************************************************************/
772
773 /* Update a channel's event queue's read pointer (RPTR) register
774 *
775 * This writes the EVQ_RPTR_REG register for the specified channel's
776 * event queue.
777 */
ef4_farch_ev_read_ack(struct ef4_channel * channel)778 void ef4_farch_ev_read_ack(struct ef4_channel *channel)
779 {
780 ef4_dword_t reg;
781 struct ef4_nic *efx = channel->efx;
782
783 EF4_POPULATE_DWORD_1(reg, FRF_AZ_EVQ_RPTR,
784 channel->eventq_read_ptr & channel->eventq_mask);
785
786 /* For Falcon A1, EVQ_RPTR_KER is documented as having a step size
787 * of 4 bytes, but it is really 16 bytes just like later revisions.
788 */
789 ef4_writed(efx, ®,
790 efx->type->evq_rptr_tbl_base +
791 FR_BZ_EVQ_RPTR_STEP * channel->channel);
792 }
793
794 /* Use HW to insert a SW defined event */
ef4_farch_generate_event(struct ef4_nic * efx,unsigned int evq,ef4_qword_t * event)795 void ef4_farch_generate_event(struct ef4_nic *efx, unsigned int evq,
796 ef4_qword_t *event)
797 {
798 ef4_oword_t drv_ev_reg;
799
800 BUILD_BUG_ON(FRF_AZ_DRV_EV_DATA_LBN != 0 ||
801 FRF_AZ_DRV_EV_DATA_WIDTH != 64);
802 drv_ev_reg.u32[0] = event->u32[0];
803 drv_ev_reg.u32[1] = event->u32[1];
804 drv_ev_reg.u32[2] = 0;
805 drv_ev_reg.u32[3] = 0;
806 EF4_SET_OWORD_FIELD(drv_ev_reg, FRF_AZ_DRV_EV_QID, evq);
807 ef4_writeo(efx, &drv_ev_reg, FR_AZ_DRV_EV);
808 }
809
ef4_farch_magic_event(struct ef4_channel * channel,u32 magic)810 static void ef4_farch_magic_event(struct ef4_channel *channel, u32 magic)
811 {
812 ef4_qword_t event;
813
814 EF4_POPULATE_QWORD_2(event, FSF_AZ_EV_CODE,
815 FSE_AZ_EV_CODE_DRV_GEN_EV,
816 FSF_AZ_DRV_GEN_EV_MAGIC, magic);
817 ef4_farch_generate_event(channel->efx, channel->channel, &event);
818 }
819
820 /* Handle a transmit completion event
821 *
822 * The NIC batches TX completion events; the message we receive is of
823 * the form "complete all TX events up to this index".
824 */
825 static int
ef4_farch_handle_tx_event(struct ef4_channel * channel,ef4_qword_t * event)826 ef4_farch_handle_tx_event(struct ef4_channel *channel, ef4_qword_t *event)
827 {
828 unsigned int tx_ev_desc_ptr;
829 unsigned int tx_ev_q_label;
830 struct ef4_tx_queue *tx_queue;
831 struct ef4_nic *efx = channel->efx;
832 int tx_packets = 0;
833
834 if (unlikely(READ_ONCE(efx->reset_pending)))
835 return 0;
836
837 if (likely(EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_COMP))) {
838 /* Transmit completion */
839 tx_ev_desc_ptr = EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR);
840 tx_ev_q_label = EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
841 tx_queue = ef4_channel_get_tx_queue(
842 channel, tx_ev_q_label % EF4_TXQ_TYPES);
843 tx_packets = ((tx_ev_desc_ptr - tx_queue->read_count) &
844 tx_queue->ptr_mask);
845 ef4_xmit_done(tx_queue, tx_ev_desc_ptr);
846 } else if (EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) {
847 /* Rewrite the FIFO write pointer */
848 tx_ev_q_label = EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
849 tx_queue = ef4_channel_get_tx_queue(
850 channel, tx_ev_q_label % EF4_TXQ_TYPES);
851
852 netif_tx_lock(efx->net_dev);
853 ef4_farch_notify_tx_desc(tx_queue);
854 netif_tx_unlock(efx->net_dev);
855 } else if (EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_PKT_ERR)) {
856 ef4_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
857 } else {
858 netif_err(efx, tx_err, efx->net_dev,
859 "channel %d unexpected TX event "
860 EF4_QWORD_FMT"\n", channel->channel,
861 EF4_QWORD_VAL(*event));
862 }
863
864 return tx_packets;
865 }
866
867 /* Detect errors included in the rx_evt_pkt_ok bit. */
ef4_farch_handle_rx_not_ok(struct ef4_rx_queue * rx_queue,const ef4_qword_t * event)868 static u16 ef4_farch_handle_rx_not_ok(struct ef4_rx_queue *rx_queue,
869 const ef4_qword_t *event)
870 {
871 struct ef4_channel *channel = ef4_rx_queue_channel(rx_queue);
872 struct ef4_nic *efx = rx_queue->efx;
873 bool __maybe_unused rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err;
874 bool rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
875 bool rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc;
876 bool rx_ev_pause_frm;
877
878 rx_ev_tobe_disc = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC);
879 rx_ev_buf_owner_id_err = EF4_QWORD_FIELD(*event,
880 FSF_AZ_RX_EV_BUF_OWNER_ID_ERR);
881 rx_ev_ip_hdr_chksum_err = EF4_QWORD_FIELD(*event,
882 FSF_AZ_RX_EV_IP_HDR_CHKSUM_ERR);
883 rx_ev_tcp_udp_chksum_err = EF4_QWORD_FIELD(*event,
884 FSF_AZ_RX_EV_TCP_UDP_CHKSUM_ERR);
885 rx_ev_eth_crc_err = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_ETH_CRC_ERR);
886 rx_ev_frm_trunc = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_FRM_TRUNC);
887 rx_ev_drib_nib = ((ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) ?
888 0 : EF4_QWORD_FIELD(*event, FSF_AA_RX_EV_DRIB_NIB));
889 rx_ev_pause_frm = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_PAUSE_FRM_ERR);
890
891
892 /* Count errors that are not in MAC stats. Ignore expected
893 * checksum errors during self-test. */
894 if (rx_ev_frm_trunc)
895 ++channel->n_rx_frm_trunc;
896 else if (rx_ev_tobe_disc)
897 ++channel->n_rx_tobe_disc;
898 else if (!efx->loopback_selftest) {
899 if (rx_ev_ip_hdr_chksum_err)
900 ++channel->n_rx_ip_hdr_chksum_err;
901 else if (rx_ev_tcp_udp_chksum_err)
902 ++channel->n_rx_tcp_udp_chksum_err;
903 }
904
905 /* TOBE_DISC is expected on unicast mismatches; don't print out an
906 * error message. FRM_TRUNC indicates RXDP dropped the packet due
907 * to a FIFO overflow.
908 */
909 #ifdef DEBUG
910 {
911 /* Every error apart from tobe_disc and pause_frm */
912
913 bool rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err |
914 rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
915 rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);
916
917 if (rx_ev_other_err && net_ratelimit()) {
918 netif_dbg(efx, rx_err, efx->net_dev,
919 " RX queue %d unexpected RX event "
920 EF4_QWORD_FMT "%s%s%s%s%s%s%s%s\n",
921 ef4_rx_queue_index(rx_queue), EF4_QWORD_VAL(*event),
922 rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "",
923 rx_ev_ip_hdr_chksum_err ?
924 " [IP_HDR_CHKSUM_ERR]" : "",
925 rx_ev_tcp_udp_chksum_err ?
926 " [TCP_UDP_CHKSUM_ERR]" : "",
927 rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "",
928 rx_ev_frm_trunc ? " [FRM_TRUNC]" : "",
929 rx_ev_drib_nib ? " [DRIB_NIB]" : "",
930 rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
931 rx_ev_pause_frm ? " [PAUSE]" : "");
932 }
933 }
934 #endif
935
936 /* The frame must be discarded if any of these are true. */
937 return (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib |
938 rx_ev_tobe_disc | rx_ev_pause_frm) ?
939 EF4_RX_PKT_DISCARD : 0;
940 }
941
942 /* Handle receive events that are not in-order. Return true if this
943 * can be handled as a partial packet discard, false if it's more
944 * serious.
945 */
946 static bool
ef4_farch_handle_rx_bad_index(struct ef4_rx_queue * rx_queue,unsigned index)947 ef4_farch_handle_rx_bad_index(struct ef4_rx_queue *rx_queue, unsigned index)
948 {
949 struct ef4_channel *channel = ef4_rx_queue_channel(rx_queue);
950 struct ef4_nic *efx = rx_queue->efx;
951 unsigned expected, dropped;
952
953 if (rx_queue->scatter_n &&
954 index == ((rx_queue->removed_count + rx_queue->scatter_n - 1) &
955 rx_queue->ptr_mask)) {
956 ++channel->n_rx_nodesc_trunc;
957 return true;
958 }
959
960 expected = rx_queue->removed_count & rx_queue->ptr_mask;
961 dropped = (index - expected) & rx_queue->ptr_mask;
962 netif_info(efx, rx_err, efx->net_dev,
963 "dropped %d events (index=%d expected=%d)\n",
964 dropped, index, expected);
965
966 ef4_schedule_reset(efx, EF4_WORKAROUND_5676(efx) ?
967 RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
968 return false;
969 }
970
971 /* Handle a packet received event
972 *
973 * The NIC gives a "discard" flag if it's a unicast packet with the
974 * wrong destination address
975 * Also "is multicast" and "matches multicast filter" flags can be used to
976 * discard non-matching multicast packets.
977 */
978 static void
ef4_farch_handle_rx_event(struct ef4_channel * channel,const ef4_qword_t * event)979 ef4_farch_handle_rx_event(struct ef4_channel *channel, const ef4_qword_t *event)
980 {
981 unsigned int rx_ev_desc_ptr, rx_ev_byte_cnt;
982 unsigned int rx_ev_hdr_type, rx_ev_mcast_pkt;
983 unsigned expected_ptr;
984 bool rx_ev_pkt_ok, rx_ev_sop, rx_ev_cont;
985 u16 flags;
986 struct ef4_rx_queue *rx_queue;
987 struct ef4_nic *efx = channel->efx;
988
989 if (unlikely(READ_ONCE(efx->reset_pending)))
990 return;
991
992 rx_ev_cont = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_JUMBO_CONT);
993 rx_ev_sop = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_SOP);
994 WARN_ON(EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_Q_LABEL) !=
995 channel->channel);
996
997 rx_queue = ef4_channel_get_rx_queue(channel);
998
999 rx_ev_desc_ptr = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR);
1000 expected_ptr = ((rx_queue->removed_count + rx_queue->scatter_n) &
1001 rx_queue->ptr_mask);
1002
1003 /* Check for partial drops and other errors */
1004 if (unlikely(rx_ev_desc_ptr != expected_ptr) ||
1005 unlikely(rx_ev_sop != (rx_queue->scatter_n == 0))) {
1006 if (rx_ev_desc_ptr != expected_ptr &&
1007 !ef4_farch_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr))
1008 return;
1009
1010 /* Discard all pending fragments */
1011 if (rx_queue->scatter_n) {
1012 ef4_rx_packet(
1013 rx_queue,
1014 rx_queue->removed_count & rx_queue->ptr_mask,
1015 rx_queue->scatter_n, 0, EF4_RX_PKT_DISCARD);
1016 rx_queue->removed_count += rx_queue->scatter_n;
1017 rx_queue->scatter_n = 0;
1018 }
1019
1020 /* Return if there is no new fragment */
1021 if (rx_ev_desc_ptr != expected_ptr)
1022 return;
1023
1024 /* Discard new fragment if not SOP */
1025 if (!rx_ev_sop) {
1026 ef4_rx_packet(
1027 rx_queue,
1028 rx_queue->removed_count & rx_queue->ptr_mask,
1029 1, 0, EF4_RX_PKT_DISCARD);
1030 ++rx_queue->removed_count;
1031 return;
1032 }
1033 }
1034
1035 ++rx_queue->scatter_n;
1036 if (rx_ev_cont)
1037 return;
1038
1039 rx_ev_byte_cnt = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_BYTE_CNT);
1040 rx_ev_pkt_ok = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_OK);
1041 rx_ev_hdr_type = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
1042
1043 if (likely(rx_ev_pkt_ok)) {
1044 /* If packet is marked as OK then we can rely on the
1045 * hardware checksum and classification.
1046 */
1047 flags = 0;
1048 switch (rx_ev_hdr_type) {
1049 case FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_TCP:
1050 flags |= EF4_RX_PKT_TCP;
1051 fallthrough;
1052 case FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_UDP:
1053 flags |= EF4_RX_PKT_CSUMMED;
1054 fallthrough;
1055 case FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_OTHER:
1056 case FSE_AZ_RX_EV_HDR_TYPE_OTHER:
1057 break;
1058 }
1059 } else {
1060 flags = ef4_farch_handle_rx_not_ok(rx_queue, event);
1061 }
1062
1063 /* Detect multicast packets that didn't match the filter */
1064 rx_ev_mcast_pkt = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
1065 if (rx_ev_mcast_pkt) {
1066 unsigned int rx_ev_mcast_hash_match =
1067 EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_HASH_MATCH);
1068
1069 if (unlikely(!rx_ev_mcast_hash_match)) {
1070 ++channel->n_rx_mcast_mismatch;
1071 flags |= EF4_RX_PKT_DISCARD;
1072 }
1073 }
1074
1075 channel->irq_mod_score += 2;
1076
1077 /* Handle received packet */
1078 ef4_rx_packet(rx_queue,
1079 rx_queue->removed_count & rx_queue->ptr_mask,
1080 rx_queue->scatter_n, rx_ev_byte_cnt, flags);
1081 rx_queue->removed_count += rx_queue->scatter_n;
1082 rx_queue->scatter_n = 0;
1083 }
1084
1085 /* If this flush done event corresponds to a &struct ef4_tx_queue, then
1086 * send an %EF4_CHANNEL_MAGIC_TX_DRAIN event to drain the event queue
1087 * of all transmit completions.
1088 */
1089 static void
ef4_farch_handle_tx_flush_done(struct ef4_nic * efx,ef4_qword_t * event)1090 ef4_farch_handle_tx_flush_done(struct ef4_nic *efx, ef4_qword_t *event)
1091 {
1092 struct ef4_tx_queue *tx_queue;
1093 int qid;
1094
1095 qid = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);
1096 if (qid < EF4_TXQ_TYPES * efx->n_tx_channels) {
1097 tx_queue = ef4_get_tx_queue(efx, qid / EF4_TXQ_TYPES,
1098 qid % EF4_TXQ_TYPES);
1099 if (atomic_cmpxchg(&tx_queue->flush_outstanding, 1, 0)) {
1100 ef4_farch_magic_event(tx_queue->channel,
1101 EF4_CHANNEL_MAGIC_TX_DRAIN(tx_queue));
1102 }
1103 }
1104 }
1105
1106 /* If this flush done event corresponds to a &struct ef4_rx_queue: If the flush
1107 * was successful then send an %EF4_CHANNEL_MAGIC_RX_DRAIN, otherwise add
1108 * the RX queue back to the mask of RX queues in need of flushing.
1109 */
1110 static void
ef4_farch_handle_rx_flush_done(struct ef4_nic * efx,ef4_qword_t * event)1111 ef4_farch_handle_rx_flush_done(struct ef4_nic *efx, ef4_qword_t *event)
1112 {
1113 struct ef4_channel *channel;
1114 struct ef4_rx_queue *rx_queue;
1115 int qid;
1116 bool failed;
1117
1118 qid = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID);
1119 failed = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL);
1120 if (qid >= efx->n_channels)
1121 return;
1122 channel = ef4_get_channel(efx, qid);
1123 if (!ef4_channel_has_rx_queue(channel))
1124 return;
1125 rx_queue = ef4_channel_get_rx_queue(channel);
1126
1127 if (failed) {
1128 netif_info(efx, hw, efx->net_dev,
1129 "RXQ %d flush retry\n", qid);
1130 rx_queue->flush_pending = true;
1131 atomic_inc(&efx->rxq_flush_pending);
1132 } else {
1133 ef4_farch_magic_event(ef4_rx_queue_channel(rx_queue),
1134 EF4_CHANNEL_MAGIC_RX_DRAIN(rx_queue));
1135 }
1136 atomic_dec(&efx->rxq_flush_outstanding);
1137 if (ef4_farch_flush_wake(efx))
1138 wake_up(&efx->flush_wq);
1139 }
1140
1141 static void
ef4_farch_handle_drain_event(struct ef4_channel * channel)1142 ef4_farch_handle_drain_event(struct ef4_channel *channel)
1143 {
1144 struct ef4_nic *efx = channel->efx;
1145
1146 WARN_ON(atomic_read(&efx->active_queues) == 0);
1147 atomic_dec(&efx->active_queues);
1148 if (ef4_farch_flush_wake(efx))
1149 wake_up(&efx->flush_wq);
1150 }
1151
ef4_farch_handle_generated_event(struct ef4_channel * channel,ef4_qword_t * event)1152 static void ef4_farch_handle_generated_event(struct ef4_channel *channel,
1153 ef4_qword_t *event)
1154 {
1155 struct ef4_nic *efx = channel->efx;
1156 struct ef4_rx_queue *rx_queue =
1157 ef4_channel_has_rx_queue(channel) ?
1158 ef4_channel_get_rx_queue(channel) : NULL;
1159 unsigned magic, code;
1160
1161 magic = EF4_QWORD_FIELD(*event, FSF_AZ_DRV_GEN_EV_MAGIC);
1162 code = _EF4_CHANNEL_MAGIC_CODE(magic);
1163
1164 if (magic == EF4_CHANNEL_MAGIC_TEST(channel)) {
1165 channel->event_test_cpu = raw_smp_processor_id();
1166 } else if (rx_queue && magic == EF4_CHANNEL_MAGIC_FILL(rx_queue)) {
1167 /* The queue must be empty, so we won't receive any rx
1168 * events, so ef4_process_channel() won't refill the
1169 * queue. Refill it here */
1170 ef4_fast_push_rx_descriptors(rx_queue, true);
1171 } else if (rx_queue && magic == EF4_CHANNEL_MAGIC_RX_DRAIN(rx_queue)) {
1172 ef4_farch_handle_drain_event(channel);
1173 } else if (code == _EF4_CHANNEL_MAGIC_TX_DRAIN) {
1174 ef4_farch_handle_drain_event(channel);
1175 } else {
1176 netif_dbg(efx, hw, efx->net_dev, "channel %d received "
1177 "generated event "EF4_QWORD_FMT"\n",
1178 channel->channel, EF4_QWORD_VAL(*event));
1179 }
1180 }
1181
1182 static void
ef4_farch_handle_driver_event(struct ef4_channel * channel,ef4_qword_t * event)1183 ef4_farch_handle_driver_event(struct ef4_channel *channel, ef4_qword_t *event)
1184 {
1185 struct ef4_nic *efx = channel->efx;
1186 unsigned int ev_sub_code;
1187 unsigned int ev_sub_data;
1188
1189 ev_sub_code = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBCODE);
1190 ev_sub_data = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);
1191
1192 switch (ev_sub_code) {
1193 case FSE_AZ_TX_DESCQ_FLS_DONE_EV:
1194 netif_vdbg(efx, hw, efx->net_dev, "channel %d TXQ %d flushed\n",
1195 channel->channel, ev_sub_data);
1196 ef4_farch_handle_tx_flush_done(efx, event);
1197 break;
1198 case FSE_AZ_RX_DESCQ_FLS_DONE_EV:
1199 netif_vdbg(efx, hw, efx->net_dev, "channel %d RXQ %d flushed\n",
1200 channel->channel, ev_sub_data);
1201 ef4_farch_handle_rx_flush_done(efx, event);
1202 break;
1203 case FSE_AZ_EVQ_INIT_DONE_EV:
1204 netif_dbg(efx, hw, efx->net_dev,
1205 "channel %d EVQ %d initialised\n",
1206 channel->channel, ev_sub_data);
1207 break;
1208 case FSE_AZ_SRM_UPD_DONE_EV:
1209 netif_vdbg(efx, hw, efx->net_dev,
1210 "channel %d SRAM update done\n", channel->channel);
1211 break;
1212 case FSE_AZ_WAKE_UP_EV:
1213 netif_vdbg(efx, hw, efx->net_dev,
1214 "channel %d RXQ %d wakeup event\n",
1215 channel->channel, ev_sub_data);
1216 break;
1217 case FSE_AZ_TIMER_EV:
1218 netif_vdbg(efx, hw, efx->net_dev,
1219 "channel %d RX queue %d timer expired\n",
1220 channel->channel, ev_sub_data);
1221 break;
1222 case FSE_AA_RX_RECOVER_EV:
1223 netif_err(efx, rx_err, efx->net_dev,
1224 "channel %d seen DRIVER RX_RESET event. "
1225 "Resetting.\n", channel->channel);
1226 atomic_inc(&efx->rx_reset);
1227 ef4_schedule_reset(efx,
1228 EF4_WORKAROUND_6555(efx) ?
1229 RESET_TYPE_RX_RECOVERY :
1230 RESET_TYPE_DISABLE);
1231 break;
1232 case FSE_BZ_RX_DSC_ERROR_EV:
1233 netif_err(efx, rx_err, efx->net_dev,
1234 "RX DMA Q %d reports descriptor fetch error."
1235 " RX Q %d is disabled.\n", ev_sub_data,
1236 ev_sub_data);
1237 ef4_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
1238 break;
1239 case FSE_BZ_TX_DSC_ERROR_EV:
1240 netif_err(efx, tx_err, efx->net_dev,
1241 "TX DMA Q %d reports descriptor fetch error."
1242 " TX Q %d is disabled.\n", ev_sub_data,
1243 ev_sub_data);
1244 ef4_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
1245 break;
1246 default:
1247 netif_vdbg(efx, hw, efx->net_dev,
1248 "channel %d unknown driver event code %d "
1249 "data %04x\n", channel->channel, ev_sub_code,
1250 ev_sub_data);
1251 break;
1252 }
1253 }
1254
ef4_farch_ev_process(struct ef4_channel * channel,int budget)1255 int ef4_farch_ev_process(struct ef4_channel *channel, int budget)
1256 {
1257 struct ef4_nic *efx = channel->efx;
1258 unsigned int read_ptr;
1259 ef4_qword_t event, *p_event;
1260 int ev_code;
1261 int tx_packets = 0;
1262 int spent = 0;
1263
1264 if (budget <= 0)
1265 return spent;
1266
1267 read_ptr = channel->eventq_read_ptr;
1268
1269 for (;;) {
1270 p_event = ef4_event(channel, read_ptr);
1271 event = *p_event;
1272
1273 if (!ef4_event_present(&event))
1274 /* End of events */
1275 break;
1276
1277 netif_vdbg(channel->efx, intr, channel->efx->net_dev,
1278 "channel %d event is "EF4_QWORD_FMT"\n",
1279 channel->channel, EF4_QWORD_VAL(event));
1280
1281 /* Clear this event by marking it all ones */
1282 EF4_SET_QWORD(*p_event);
1283
1284 ++read_ptr;
1285
1286 ev_code = EF4_QWORD_FIELD(event, FSF_AZ_EV_CODE);
1287
1288 switch (ev_code) {
1289 case FSE_AZ_EV_CODE_RX_EV:
1290 ef4_farch_handle_rx_event(channel, &event);
1291 if (++spent == budget)
1292 goto out;
1293 break;
1294 case FSE_AZ_EV_CODE_TX_EV:
1295 tx_packets += ef4_farch_handle_tx_event(channel,
1296 &event);
1297 if (tx_packets > efx->txq_entries) {
1298 spent = budget;
1299 goto out;
1300 }
1301 break;
1302 case FSE_AZ_EV_CODE_DRV_GEN_EV:
1303 ef4_farch_handle_generated_event(channel, &event);
1304 break;
1305 case FSE_AZ_EV_CODE_DRIVER_EV:
1306 ef4_farch_handle_driver_event(channel, &event);
1307 break;
1308 case FSE_AZ_EV_CODE_GLOBAL_EV:
1309 if (efx->type->handle_global_event &&
1310 efx->type->handle_global_event(channel, &event))
1311 break;
1312 fallthrough;
1313 default:
1314 netif_err(channel->efx, hw, channel->efx->net_dev,
1315 "channel %d unknown event type %d (data "
1316 EF4_QWORD_FMT ")\n", channel->channel,
1317 ev_code, EF4_QWORD_VAL(event));
1318 }
1319 }
1320
1321 out:
1322 channel->eventq_read_ptr = read_ptr;
1323 return spent;
1324 }
1325
1326 /* Allocate buffer table entries for event queue */
ef4_farch_ev_probe(struct ef4_channel * channel)1327 int ef4_farch_ev_probe(struct ef4_channel *channel)
1328 {
1329 struct ef4_nic *efx = channel->efx;
1330 unsigned entries;
1331
1332 entries = channel->eventq_mask + 1;
1333 return ef4_alloc_special_buffer(efx, &channel->eventq,
1334 entries * sizeof(ef4_qword_t));
1335 }
1336
ef4_farch_ev_init(struct ef4_channel * channel)1337 int ef4_farch_ev_init(struct ef4_channel *channel)
1338 {
1339 ef4_oword_t reg;
1340 struct ef4_nic *efx = channel->efx;
1341
1342 netif_dbg(efx, hw, efx->net_dev,
1343 "channel %d event queue in special buffers %d-%d\n",
1344 channel->channel, channel->eventq.index,
1345 channel->eventq.index + channel->eventq.entries - 1);
1346
1347 /* Pin event queue buffer */
1348 ef4_init_special_buffer(efx, &channel->eventq);
1349
1350 /* Fill event queue with all ones (i.e. empty events) */
1351 memset(channel->eventq.buf.addr, 0xff, channel->eventq.buf.len);
1352
1353 /* Push event queue to card */
1354 EF4_POPULATE_OWORD_3(reg,
1355 FRF_AZ_EVQ_EN, 1,
1356 FRF_AZ_EVQ_SIZE, __ffs(channel->eventq.entries),
1357 FRF_AZ_EVQ_BUF_BASE_ID, channel->eventq.index);
1358 ef4_writeo_table(efx, ®, efx->type->evq_ptr_tbl_base,
1359 channel->channel);
1360
1361 return 0;
1362 }
1363
ef4_farch_ev_fini(struct ef4_channel * channel)1364 void ef4_farch_ev_fini(struct ef4_channel *channel)
1365 {
1366 ef4_oword_t reg;
1367 struct ef4_nic *efx = channel->efx;
1368
1369 /* Remove event queue from card */
1370 EF4_ZERO_OWORD(reg);
1371 ef4_writeo_table(efx, ®, efx->type->evq_ptr_tbl_base,
1372 channel->channel);
1373
1374 /* Unpin event queue */
1375 ef4_fini_special_buffer(efx, &channel->eventq);
1376 }
1377
1378 /* Free buffers backing event queue */
ef4_farch_ev_remove(struct ef4_channel * channel)1379 void ef4_farch_ev_remove(struct ef4_channel *channel)
1380 {
1381 ef4_free_special_buffer(channel->efx, &channel->eventq);
1382 }
1383
1384
ef4_farch_ev_test_generate(struct ef4_channel * channel)1385 void ef4_farch_ev_test_generate(struct ef4_channel *channel)
1386 {
1387 ef4_farch_magic_event(channel, EF4_CHANNEL_MAGIC_TEST(channel));
1388 }
1389
ef4_farch_rx_defer_refill(struct ef4_rx_queue * rx_queue)1390 void ef4_farch_rx_defer_refill(struct ef4_rx_queue *rx_queue)
1391 {
1392 ef4_farch_magic_event(ef4_rx_queue_channel(rx_queue),
1393 EF4_CHANNEL_MAGIC_FILL(rx_queue));
1394 }
1395
1396 /**************************************************************************
1397 *
1398 * Hardware interrupts
1399 * The hardware interrupt handler does very little work; all the event
1400 * queue processing is carried out by per-channel tasklets.
1401 *
1402 **************************************************************************/
1403
1404 /* Enable/disable/generate interrupts */
ef4_farch_interrupts(struct ef4_nic * efx,bool enabled,bool force)1405 static inline void ef4_farch_interrupts(struct ef4_nic *efx,
1406 bool enabled, bool force)
1407 {
1408 ef4_oword_t int_en_reg_ker;
1409
1410 EF4_POPULATE_OWORD_3(int_en_reg_ker,
1411 FRF_AZ_KER_INT_LEVE_SEL, efx->irq_level,
1412 FRF_AZ_KER_INT_KER, force,
1413 FRF_AZ_DRV_INT_EN_KER, enabled);
1414 ef4_writeo(efx, &int_en_reg_ker, FR_AZ_INT_EN_KER);
1415 }
1416
ef4_farch_irq_enable_master(struct ef4_nic * efx)1417 void ef4_farch_irq_enable_master(struct ef4_nic *efx)
1418 {
1419 EF4_ZERO_OWORD(*((ef4_oword_t *) efx->irq_status.addr));
1420 wmb(); /* Ensure interrupt vector is clear before interrupts enabled */
1421
1422 ef4_farch_interrupts(efx, true, false);
1423 }
1424
ef4_farch_irq_disable_master(struct ef4_nic * efx)1425 void ef4_farch_irq_disable_master(struct ef4_nic *efx)
1426 {
1427 /* Disable interrupts */
1428 ef4_farch_interrupts(efx, false, false);
1429 }
1430
1431 /* Generate a test interrupt
1432 * Interrupt must already have been enabled, otherwise nasty things
1433 * may happen.
1434 */
ef4_farch_irq_test_generate(struct ef4_nic * efx)1435 int ef4_farch_irq_test_generate(struct ef4_nic *efx)
1436 {
1437 ef4_farch_interrupts(efx, true, true);
1438 return 0;
1439 }
1440
1441 /* Process a fatal interrupt
1442 * Disable bus mastering ASAP and schedule a reset
1443 */
ef4_farch_fatal_interrupt(struct ef4_nic * efx)1444 irqreturn_t ef4_farch_fatal_interrupt(struct ef4_nic *efx)
1445 {
1446 struct falcon_nic_data *nic_data = efx->nic_data;
1447 ef4_oword_t *int_ker = efx->irq_status.addr;
1448 ef4_oword_t fatal_intr;
1449 int error, mem_perr;
1450
1451 ef4_reado(efx, &fatal_intr, FR_AZ_FATAL_INTR_KER);
1452 error = EF4_OWORD_FIELD(fatal_intr, FRF_AZ_FATAL_INTR);
1453
1454 netif_err(efx, hw, efx->net_dev, "SYSTEM ERROR "EF4_OWORD_FMT" status "
1455 EF4_OWORD_FMT ": %s\n", EF4_OWORD_VAL(*int_ker),
1456 EF4_OWORD_VAL(fatal_intr),
1457 error ? "disabling bus mastering" : "no recognised error");
1458
1459 /* If this is a memory parity error dump which blocks are offending */
1460 mem_perr = (EF4_OWORD_FIELD(fatal_intr, FRF_AZ_MEM_PERR_INT_KER) ||
1461 EF4_OWORD_FIELD(fatal_intr, FRF_AZ_SRM_PERR_INT_KER));
1462 if (mem_perr) {
1463 ef4_oword_t reg;
1464 ef4_reado(efx, ®, FR_AZ_MEM_STAT);
1465 netif_err(efx, hw, efx->net_dev,
1466 "SYSTEM ERROR: memory parity error "EF4_OWORD_FMT"\n",
1467 EF4_OWORD_VAL(reg));
1468 }
1469
1470 /* Disable both devices */
1471 pci_clear_master(efx->pci_dev);
1472 if (ef4_nic_is_dual_func(efx))
1473 pci_clear_master(nic_data->pci_dev2);
1474 ef4_farch_irq_disable_master(efx);
1475
1476 /* Count errors and reset or disable the NIC accordingly */
1477 if (efx->int_error_count == 0 ||
1478 time_after(jiffies, efx->int_error_expire)) {
1479 efx->int_error_count = 0;
1480 efx->int_error_expire =
1481 jiffies + EF4_INT_ERROR_EXPIRE * HZ;
1482 }
1483 if (++efx->int_error_count < EF4_MAX_INT_ERRORS) {
1484 netif_err(efx, hw, efx->net_dev,
1485 "SYSTEM ERROR - reset scheduled\n");
1486 ef4_schedule_reset(efx, RESET_TYPE_INT_ERROR);
1487 } else {
1488 netif_err(efx, hw, efx->net_dev,
1489 "SYSTEM ERROR - max number of errors seen."
1490 "NIC will be disabled\n");
1491 ef4_schedule_reset(efx, RESET_TYPE_DISABLE);
1492 }
1493
1494 return IRQ_HANDLED;
1495 }
1496
1497 /* Handle a legacy interrupt
1498 * Acknowledges the interrupt and schedule event queue processing.
1499 */
ef4_farch_legacy_interrupt(int irq,void * dev_id)1500 irqreturn_t ef4_farch_legacy_interrupt(int irq, void *dev_id)
1501 {
1502 struct ef4_nic *efx = dev_id;
1503 bool soft_enabled = READ_ONCE(efx->irq_soft_enabled);
1504 ef4_oword_t *int_ker = efx->irq_status.addr;
1505 irqreturn_t result = IRQ_NONE;
1506 struct ef4_channel *channel;
1507 ef4_dword_t reg;
1508 u32 queues;
1509 int syserr;
1510
1511 /* Read the ISR which also ACKs the interrupts */
1512 ef4_readd(efx, ®, FR_BZ_INT_ISR0);
1513 queues = EF4_EXTRACT_DWORD(reg, 0, 31);
1514
1515 /* Legacy interrupts are disabled too late by the EEH kernel
1516 * code. Disable them earlier.
1517 * If an EEH error occurred, the read will have returned all ones.
1518 */
1519 if (EF4_DWORD_IS_ALL_ONES(reg) && ef4_try_recovery(efx) &&
1520 !efx->eeh_disabled_legacy_irq) {
1521 disable_irq_nosync(efx->legacy_irq);
1522 efx->eeh_disabled_legacy_irq = true;
1523 }
1524
1525 /* Handle non-event-queue sources */
1526 if (queues & (1U << efx->irq_level) && soft_enabled) {
1527 syserr = EF4_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
1528 if (unlikely(syserr))
1529 return ef4_farch_fatal_interrupt(efx);
1530 efx->last_irq_cpu = raw_smp_processor_id();
1531 }
1532
1533 if (queues != 0) {
1534 efx->irq_zero_count = 0;
1535
1536 /* Schedule processing of any interrupting queues */
1537 if (likely(soft_enabled)) {
1538 ef4_for_each_channel(channel, efx) {
1539 if (queues & 1)
1540 ef4_schedule_channel_irq(channel);
1541 queues >>= 1;
1542 }
1543 }
1544 result = IRQ_HANDLED;
1545
1546 } else {
1547 ef4_qword_t *event;
1548
1549 /* Legacy ISR read can return zero once (SF bug 15783) */
1550
1551 /* We can't return IRQ_HANDLED more than once on seeing ISR=0
1552 * because this might be a shared interrupt. */
1553 if (efx->irq_zero_count++ == 0)
1554 result = IRQ_HANDLED;
1555
1556 /* Ensure we schedule or rearm all event queues */
1557 if (likely(soft_enabled)) {
1558 ef4_for_each_channel(channel, efx) {
1559 event = ef4_event(channel,
1560 channel->eventq_read_ptr);
1561 if (ef4_event_present(event))
1562 ef4_schedule_channel_irq(channel);
1563 else
1564 ef4_farch_ev_read_ack(channel);
1565 }
1566 }
1567 }
1568
1569 if (result == IRQ_HANDLED)
1570 netif_vdbg(efx, intr, efx->net_dev,
1571 "IRQ %d on CPU %d status " EF4_DWORD_FMT "\n",
1572 irq, raw_smp_processor_id(), EF4_DWORD_VAL(reg));
1573
1574 return result;
1575 }
1576
1577 /* Handle an MSI interrupt
1578 *
1579 * Handle an MSI hardware interrupt. This routine schedules event
1580 * queue processing. No interrupt acknowledgement cycle is necessary.
1581 * Also, we never need to check that the interrupt is for us, since
1582 * MSI interrupts cannot be shared.
1583 */
ef4_farch_msi_interrupt(int irq,void * dev_id)1584 irqreturn_t ef4_farch_msi_interrupt(int irq, void *dev_id)
1585 {
1586 struct ef4_msi_context *context = dev_id;
1587 struct ef4_nic *efx = context->efx;
1588 ef4_oword_t *int_ker = efx->irq_status.addr;
1589 int syserr;
1590
1591 netif_vdbg(efx, intr, efx->net_dev,
1592 "IRQ %d on CPU %d status " EF4_OWORD_FMT "\n",
1593 irq, raw_smp_processor_id(), EF4_OWORD_VAL(*int_ker));
1594
1595 if (!likely(READ_ONCE(efx->irq_soft_enabled)))
1596 return IRQ_HANDLED;
1597
1598 /* Handle non-event-queue sources */
1599 if (context->index == efx->irq_level) {
1600 syserr = EF4_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
1601 if (unlikely(syserr))
1602 return ef4_farch_fatal_interrupt(efx);
1603 efx->last_irq_cpu = raw_smp_processor_id();
1604 }
1605
1606 /* Schedule processing of the channel */
1607 ef4_schedule_channel_irq(efx->channel[context->index]);
1608
1609 return IRQ_HANDLED;
1610 }
1611
1612 /* Setup RSS indirection table.
1613 * This maps from the hash value of the packet to RXQ
1614 */
ef4_farch_rx_push_indir_table(struct ef4_nic * efx)1615 void ef4_farch_rx_push_indir_table(struct ef4_nic *efx)
1616 {
1617 size_t i = 0;
1618 ef4_dword_t dword;
1619
1620 BUG_ON(ef4_nic_rev(efx) < EF4_REV_FALCON_B0);
1621
1622 BUILD_BUG_ON(ARRAY_SIZE(efx->rx_indir_table) !=
1623 FR_BZ_RX_INDIRECTION_TBL_ROWS);
1624
1625 for (i = 0; i < FR_BZ_RX_INDIRECTION_TBL_ROWS; i++) {
1626 EF4_POPULATE_DWORD_1(dword, FRF_BZ_IT_QUEUE,
1627 efx->rx_indir_table[i]);
1628 ef4_writed(efx, &dword,
1629 FR_BZ_RX_INDIRECTION_TBL +
1630 FR_BZ_RX_INDIRECTION_TBL_STEP * i);
1631 }
1632 }
1633
1634 /* Looks at available SRAM resources and works out how many queues we
1635 * can support, and where things like descriptor caches should live.
1636 *
1637 * SRAM is split up as follows:
1638 * 0 buftbl entries for channels
1639 * efx->vf_buftbl_base buftbl entries for SR-IOV
1640 * efx->rx_dc_base RX descriptor caches
1641 * efx->tx_dc_base TX descriptor caches
1642 */
ef4_farch_dimension_resources(struct ef4_nic * efx,unsigned sram_lim_qw)1643 void ef4_farch_dimension_resources(struct ef4_nic *efx, unsigned sram_lim_qw)
1644 {
1645 unsigned vi_count;
1646
1647 /* Account for the buffer table entries backing the datapath channels
1648 * and the descriptor caches for those channels.
1649 */
1650 vi_count = max(efx->n_channels, efx->n_tx_channels * EF4_TXQ_TYPES);
1651
1652 efx->tx_dc_base = sram_lim_qw - vi_count * TX_DC_ENTRIES;
1653 efx->rx_dc_base = efx->tx_dc_base - vi_count * RX_DC_ENTRIES;
1654 }
1655
ef4_farch_fpga_ver(struct ef4_nic * efx)1656 u32 ef4_farch_fpga_ver(struct ef4_nic *efx)
1657 {
1658 ef4_oword_t altera_build;
1659 ef4_reado(efx, &altera_build, FR_AZ_ALTERA_BUILD);
1660 return EF4_OWORD_FIELD(altera_build, FRF_AZ_ALTERA_BUILD_VER);
1661 }
1662
ef4_farch_init_common(struct ef4_nic * efx)1663 void ef4_farch_init_common(struct ef4_nic *efx)
1664 {
1665 ef4_oword_t temp;
1666
1667 /* Set positions of descriptor caches in SRAM. */
1668 EF4_POPULATE_OWORD_1(temp, FRF_AZ_SRM_TX_DC_BASE_ADR, efx->tx_dc_base);
1669 ef4_writeo(efx, &temp, FR_AZ_SRM_TX_DC_CFG);
1670 EF4_POPULATE_OWORD_1(temp, FRF_AZ_SRM_RX_DC_BASE_ADR, efx->rx_dc_base);
1671 ef4_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG);
1672
1673 /* Set TX descriptor cache size. */
1674 BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER));
1675 EF4_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
1676 ef4_writeo(efx, &temp, FR_AZ_TX_DC_CFG);
1677
1678 /* Set RX descriptor cache size. Set low watermark to size-8, as
1679 * this allows most efficient prefetching.
1680 */
1681 BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER));
1682 EF4_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
1683 ef4_writeo(efx, &temp, FR_AZ_RX_DC_CFG);
1684 EF4_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8);
1685 ef4_writeo(efx, &temp, FR_AZ_RX_DC_PF_WM);
1686
1687 /* Program INT_KER address */
1688 EF4_POPULATE_OWORD_2(temp,
1689 FRF_AZ_NORM_INT_VEC_DIS_KER,
1690 EF4_INT_MODE_USE_MSI(efx),
1691 FRF_AZ_INT_ADR_KER, efx->irq_status.dma_addr);
1692 ef4_writeo(efx, &temp, FR_AZ_INT_ADR_KER);
1693
1694 /* Use a valid MSI-X vector */
1695 efx->irq_level = 0;
1696
1697 /* Enable all the genuinely fatal interrupts. (They are still
1698 * masked by the overall interrupt mask, controlled by
1699 * falcon_interrupts()).
1700 *
1701 * Note: All other fatal interrupts are enabled
1702 */
1703 EF4_POPULATE_OWORD_3(temp,
1704 FRF_AZ_ILL_ADR_INT_KER_EN, 1,
1705 FRF_AZ_RBUF_OWN_INT_KER_EN, 1,
1706 FRF_AZ_TBUF_OWN_INT_KER_EN, 1);
1707 EF4_INVERT_OWORD(temp);
1708 ef4_writeo(efx, &temp, FR_AZ_FATAL_INTR_KER);
1709
1710 /* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be
1711 * controlled by the RX FIFO fill level. Set arbitration to one pkt/Q.
1712 */
1713 ef4_reado(efx, &temp, FR_AZ_TX_RESERVED);
1714 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER, 0xfe);
1715 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER_EN, 1);
1716 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_ONE_PKT_PER_Q, 1);
1717 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_PUSH_EN, 1);
1718 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_DIS_NON_IP_EV, 1);
1719 /* Enable SW_EV to inherit in char driver - assume harmless here */
1720 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1);
1721 /* Prefetch threshold 2 => fetch when descriptor cache half empty */
1722 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2);
1723 /* Disable hardware watchdog which can misfire */
1724 EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_WD_TMR, 0x3fffff);
1725 /* Squash TX of packets of 16 bytes or less */
1726 if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0)
1727 EF4_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1);
1728 ef4_writeo(efx, &temp, FR_AZ_TX_RESERVED);
1729
1730 if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) {
1731 EF4_POPULATE_OWORD_4(temp,
1732 /* Default values */
1733 FRF_BZ_TX_PACE_SB_NOT_AF, 0x15,
1734 FRF_BZ_TX_PACE_SB_AF, 0xb,
1735 FRF_BZ_TX_PACE_FB_BASE, 0,
1736 /* Allow large pace values in the
1737 * fast bin. */
1738 FRF_BZ_TX_PACE_BIN_TH,
1739 FFE_BZ_TX_PACE_RESERVED);
1740 ef4_writeo(efx, &temp, FR_BZ_TX_PACE);
1741 }
1742 }
1743
1744 /**************************************************************************
1745 *
1746 * Filter tables
1747 *
1748 **************************************************************************
1749 */
1750
1751 /* "Fudge factors" - difference between programmed value and actual depth.
1752 * Due to pipelined implementation we need to program H/W with a value that
1753 * is larger than the hop limit we want.
1754 */
1755 #define EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD 3
1756 #define EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL 1
1757
1758 /* Hard maximum search limit. Hardware will time-out beyond 200-something.
1759 * We also need to avoid infinite loops in ef4_farch_filter_search() when the
1760 * table is full.
1761 */
1762 #define EF4_FARCH_FILTER_CTL_SRCH_MAX 200
1763
1764 /* Don't try very hard to find space for performance hints, as this is
1765 * counter-productive. */
1766 #define EF4_FARCH_FILTER_CTL_SRCH_HINT_MAX 5
1767
1768 enum ef4_farch_filter_type {
1769 EF4_FARCH_FILTER_TCP_FULL = 0,
1770 EF4_FARCH_FILTER_TCP_WILD,
1771 EF4_FARCH_FILTER_UDP_FULL,
1772 EF4_FARCH_FILTER_UDP_WILD,
1773 EF4_FARCH_FILTER_MAC_FULL = 4,
1774 EF4_FARCH_FILTER_MAC_WILD,
1775 EF4_FARCH_FILTER_UC_DEF = 8,
1776 EF4_FARCH_FILTER_MC_DEF,
1777 EF4_FARCH_FILTER_TYPE_COUNT, /* number of specific types */
1778 };
1779
1780 enum ef4_farch_filter_table_id {
1781 EF4_FARCH_FILTER_TABLE_RX_IP = 0,
1782 EF4_FARCH_FILTER_TABLE_RX_MAC,
1783 EF4_FARCH_FILTER_TABLE_RX_DEF,
1784 EF4_FARCH_FILTER_TABLE_TX_MAC,
1785 EF4_FARCH_FILTER_TABLE_COUNT,
1786 };
1787
1788 enum ef4_farch_filter_index {
1789 EF4_FARCH_FILTER_INDEX_UC_DEF,
1790 EF4_FARCH_FILTER_INDEX_MC_DEF,
1791 EF4_FARCH_FILTER_SIZE_RX_DEF,
1792 };
1793
1794 struct ef4_farch_filter_spec {
1795 u8 type:4;
1796 u8 priority:4;
1797 u8 flags;
1798 u16 dmaq_id;
1799 u32 data[3];
1800 };
1801
1802 struct ef4_farch_filter_table {
1803 enum ef4_farch_filter_table_id id;
1804 u32 offset; /* address of table relative to BAR */
1805 unsigned size; /* number of entries */
1806 unsigned step; /* step between entries */
1807 unsigned used; /* number currently used */
1808 unsigned long *used_bitmap;
1809 struct ef4_farch_filter_spec *spec;
1810 unsigned search_limit[EF4_FARCH_FILTER_TYPE_COUNT];
1811 };
1812
1813 struct ef4_farch_filter_state {
1814 struct ef4_farch_filter_table table[EF4_FARCH_FILTER_TABLE_COUNT];
1815 };
1816
1817 static void
1818 ef4_farch_filter_table_clear_entry(struct ef4_nic *efx,
1819 struct ef4_farch_filter_table *table,
1820 unsigned int filter_idx);
1821
1822 /* The filter hash function is LFSR polynomial x^16 + x^3 + 1 of a 32-bit
1823 * key derived from the n-tuple. The initial LFSR state is 0xffff. */
ef4_farch_filter_hash(u32 key)1824 static u16 ef4_farch_filter_hash(u32 key)
1825 {
1826 u16 tmp;
1827
1828 /* First 16 rounds */
1829 tmp = 0x1fff ^ key >> 16;
1830 tmp = tmp ^ tmp >> 3 ^ tmp >> 6;
1831 tmp = tmp ^ tmp >> 9;
1832 /* Last 16 rounds */
1833 tmp = tmp ^ tmp << 13 ^ key;
1834 tmp = tmp ^ tmp >> 3 ^ tmp >> 6;
1835 return tmp ^ tmp >> 9;
1836 }
1837
1838 /* To allow for hash collisions, filter search continues at these
1839 * increments from the first possible entry selected by the hash. */
ef4_farch_filter_increment(u32 key)1840 static u16 ef4_farch_filter_increment(u32 key)
1841 {
1842 return key * 2 - 1;
1843 }
1844
1845 static enum ef4_farch_filter_table_id
ef4_farch_filter_spec_table_id(const struct ef4_farch_filter_spec * spec)1846 ef4_farch_filter_spec_table_id(const struct ef4_farch_filter_spec *spec)
1847 {
1848 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP !=
1849 (EF4_FARCH_FILTER_TCP_FULL >> 2));
1850 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP !=
1851 (EF4_FARCH_FILTER_TCP_WILD >> 2));
1852 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP !=
1853 (EF4_FARCH_FILTER_UDP_FULL >> 2));
1854 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP !=
1855 (EF4_FARCH_FILTER_UDP_WILD >> 2));
1856 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_MAC !=
1857 (EF4_FARCH_FILTER_MAC_FULL >> 2));
1858 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_MAC !=
1859 (EF4_FARCH_FILTER_MAC_WILD >> 2));
1860 BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_TX_MAC !=
1861 EF4_FARCH_FILTER_TABLE_RX_MAC + 2);
1862 return (spec->type >> 2) + ((spec->flags & EF4_FILTER_FLAG_TX) ? 2 : 0);
1863 }
1864
ef4_farch_filter_push_rx_config(struct ef4_nic * efx)1865 static void ef4_farch_filter_push_rx_config(struct ef4_nic *efx)
1866 {
1867 struct ef4_farch_filter_state *state = efx->filter_state;
1868 struct ef4_farch_filter_table *table;
1869 ef4_oword_t filter_ctl;
1870
1871 ef4_reado(efx, &filter_ctl, FR_BZ_RX_FILTER_CTL);
1872
1873 table = &state->table[EF4_FARCH_FILTER_TABLE_RX_IP];
1874 EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_TCP_FULL_SRCH_LIMIT,
1875 table->search_limit[EF4_FARCH_FILTER_TCP_FULL] +
1876 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
1877 EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_TCP_WILD_SRCH_LIMIT,
1878 table->search_limit[EF4_FARCH_FILTER_TCP_WILD] +
1879 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
1880 EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_UDP_FULL_SRCH_LIMIT,
1881 table->search_limit[EF4_FARCH_FILTER_UDP_FULL] +
1882 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
1883 EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_UDP_WILD_SRCH_LIMIT,
1884 table->search_limit[EF4_FARCH_FILTER_UDP_WILD] +
1885 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
1886
1887 table = &state->table[EF4_FARCH_FILTER_TABLE_RX_MAC];
1888 if (table->size) {
1889 EF4_SET_OWORD_FIELD(
1890 filter_ctl, FRF_CZ_ETHERNET_FULL_SEARCH_LIMIT,
1891 table->search_limit[EF4_FARCH_FILTER_MAC_FULL] +
1892 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
1893 EF4_SET_OWORD_FIELD(
1894 filter_ctl, FRF_CZ_ETHERNET_WILDCARD_SEARCH_LIMIT,
1895 table->search_limit[EF4_FARCH_FILTER_MAC_WILD] +
1896 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
1897 }
1898
1899 table = &state->table[EF4_FARCH_FILTER_TABLE_RX_DEF];
1900 if (table->size) {
1901 EF4_SET_OWORD_FIELD(
1902 filter_ctl, FRF_CZ_UNICAST_NOMATCH_Q_ID,
1903 table->spec[EF4_FARCH_FILTER_INDEX_UC_DEF].dmaq_id);
1904 EF4_SET_OWORD_FIELD(
1905 filter_ctl, FRF_CZ_UNICAST_NOMATCH_RSS_ENABLED,
1906 !!(table->spec[EF4_FARCH_FILTER_INDEX_UC_DEF].flags &
1907 EF4_FILTER_FLAG_RX_RSS));
1908 EF4_SET_OWORD_FIELD(
1909 filter_ctl, FRF_CZ_MULTICAST_NOMATCH_Q_ID,
1910 table->spec[EF4_FARCH_FILTER_INDEX_MC_DEF].dmaq_id);
1911 EF4_SET_OWORD_FIELD(
1912 filter_ctl, FRF_CZ_MULTICAST_NOMATCH_RSS_ENABLED,
1913 !!(table->spec[EF4_FARCH_FILTER_INDEX_MC_DEF].flags &
1914 EF4_FILTER_FLAG_RX_RSS));
1915
1916 /* There is a single bit to enable RX scatter for all
1917 * unmatched packets. Only set it if scatter is
1918 * enabled in both filter specs.
1919 */
1920 EF4_SET_OWORD_FIELD(
1921 filter_ctl, FRF_BZ_SCATTER_ENBL_NO_MATCH_Q,
1922 !!(table->spec[EF4_FARCH_FILTER_INDEX_UC_DEF].flags &
1923 table->spec[EF4_FARCH_FILTER_INDEX_MC_DEF].flags &
1924 EF4_FILTER_FLAG_RX_SCATTER));
1925 } else if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) {
1926 /* We don't expose 'default' filters because unmatched
1927 * packets always go to the queue number found in the
1928 * RSS table. But we still need to set the RX scatter
1929 * bit here.
1930 */
1931 EF4_SET_OWORD_FIELD(
1932 filter_ctl, FRF_BZ_SCATTER_ENBL_NO_MATCH_Q,
1933 efx->rx_scatter);
1934 }
1935
1936 ef4_writeo(efx, &filter_ctl, FR_BZ_RX_FILTER_CTL);
1937 }
1938
ef4_farch_filter_push_tx_limits(struct ef4_nic * efx)1939 static void ef4_farch_filter_push_tx_limits(struct ef4_nic *efx)
1940 {
1941 struct ef4_farch_filter_state *state = efx->filter_state;
1942 struct ef4_farch_filter_table *table;
1943 ef4_oword_t tx_cfg;
1944
1945 ef4_reado(efx, &tx_cfg, FR_AZ_TX_CFG);
1946
1947 table = &state->table[EF4_FARCH_FILTER_TABLE_TX_MAC];
1948 if (table->size) {
1949 EF4_SET_OWORD_FIELD(
1950 tx_cfg, FRF_CZ_TX_ETH_FILTER_FULL_SEARCH_RANGE,
1951 table->search_limit[EF4_FARCH_FILTER_MAC_FULL] +
1952 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL);
1953 EF4_SET_OWORD_FIELD(
1954 tx_cfg, FRF_CZ_TX_ETH_FILTER_WILD_SEARCH_RANGE,
1955 table->search_limit[EF4_FARCH_FILTER_MAC_WILD] +
1956 EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD);
1957 }
1958
1959 ef4_writeo(efx, &tx_cfg, FR_AZ_TX_CFG);
1960 }
1961
1962 static int
ef4_farch_filter_from_gen_spec(struct ef4_farch_filter_spec * spec,const struct ef4_filter_spec * gen_spec)1963 ef4_farch_filter_from_gen_spec(struct ef4_farch_filter_spec *spec,
1964 const struct ef4_filter_spec *gen_spec)
1965 {
1966 bool is_full = false;
1967
1968 if ((gen_spec->flags & EF4_FILTER_FLAG_RX_RSS) &&
1969 gen_spec->rss_context != EF4_FILTER_RSS_CONTEXT_DEFAULT)
1970 return -EINVAL;
1971
1972 spec->priority = gen_spec->priority;
1973 spec->flags = gen_spec->flags;
1974 spec->dmaq_id = gen_spec->dmaq_id;
1975
1976 switch (gen_spec->match_flags) {
1977 case (EF4_FILTER_MATCH_ETHER_TYPE | EF4_FILTER_MATCH_IP_PROTO |
1978 EF4_FILTER_MATCH_LOC_HOST | EF4_FILTER_MATCH_LOC_PORT |
1979 EF4_FILTER_MATCH_REM_HOST | EF4_FILTER_MATCH_REM_PORT):
1980 is_full = true;
1981 fallthrough;
1982 case (EF4_FILTER_MATCH_ETHER_TYPE | EF4_FILTER_MATCH_IP_PROTO |
1983 EF4_FILTER_MATCH_LOC_HOST | EF4_FILTER_MATCH_LOC_PORT): {
1984 __be32 rhost, host1, host2;
1985 __be16 rport, port1, port2;
1986
1987 EF4_BUG_ON_PARANOID(!(gen_spec->flags & EF4_FILTER_FLAG_RX));
1988
1989 if (gen_spec->ether_type != htons(ETH_P_IP))
1990 return -EPROTONOSUPPORT;
1991 if (gen_spec->loc_port == 0 ||
1992 (is_full && gen_spec->rem_port == 0))
1993 return -EADDRNOTAVAIL;
1994 switch (gen_spec->ip_proto) {
1995 case IPPROTO_TCP:
1996 spec->type = (is_full ? EF4_FARCH_FILTER_TCP_FULL :
1997 EF4_FARCH_FILTER_TCP_WILD);
1998 break;
1999 case IPPROTO_UDP:
2000 spec->type = (is_full ? EF4_FARCH_FILTER_UDP_FULL :
2001 EF4_FARCH_FILTER_UDP_WILD);
2002 break;
2003 default:
2004 return -EPROTONOSUPPORT;
2005 }
2006
2007 /* Filter is constructed in terms of source and destination,
2008 * with the odd wrinkle that the ports are swapped in a UDP
2009 * wildcard filter. We need to convert from local and remote
2010 * (= zero for wildcard) addresses.
2011 */
2012 rhost = is_full ? gen_spec->rem_host[0] : 0;
2013 rport = is_full ? gen_spec->rem_port : 0;
2014 host1 = rhost;
2015 host2 = gen_spec->loc_host[0];
2016 if (!is_full && gen_spec->ip_proto == IPPROTO_UDP) {
2017 port1 = gen_spec->loc_port;
2018 port2 = rport;
2019 } else {
2020 port1 = rport;
2021 port2 = gen_spec->loc_port;
2022 }
2023 spec->data[0] = ntohl(host1) << 16 | ntohs(port1);
2024 spec->data[1] = ntohs(port2) << 16 | ntohl(host1) >> 16;
2025 spec->data[2] = ntohl(host2);
2026
2027 break;
2028 }
2029
2030 case EF4_FILTER_MATCH_LOC_MAC | EF4_FILTER_MATCH_OUTER_VID:
2031 is_full = true;
2032 fallthrough;
2033 case EF4_FILTER_MATCH_LOC_MAC:
2034 spec->type = (is_full ? EF4_FARCH_FILTER_MAC_FULL :
2035 EF4_FARCH_FILTER_MAC_WILD);
2036 spec->data[0] = is_full ? ntohs(gen_spec->outer_vid) : 0;
2037 spec->data[1] = (gen_spec->loc_mac[2] << 24 |
2038 gen_spec->loc_mac[3] << 16 |
2039 gen_spec->loc_mac[4] << 8 |
2040 gen_spec->loc_mac[5]);
2041 spec->data[2] = (gen_spec->loc_mac[0] << 8 |
2042 gen_spec->loc_mac[1]);
2043 break;
2044
2045 case EF4_FILTER_MATCH_LOC_MAC_IG:
2046 spec->type = (is_multicast_ether_addr(gen_spec->loc_mac) ?
2047 EF4_FARCH_FILTER_MC_DEF :
2048 EF4_FARCH_FILTER_UC_DEF);
2049 memset(spec->data, 0, sizeof(spec->data)); /* ensure equality */
2050 break;
2051
2052 default:
2053 return -EPROTONOSUPPORT;
2054 }
2055
2056 return 0;
2057 }
2058
2059 static void
ef4_farch_filter_to_gen_spec(struct ef4_filter_spec * gen_spec,const struct ef4_farch_filter_spec * spec)2060 ef4_farch_filter_to_gen_spec(struct ef4_filter_spec *gen_spec,
2061 const struct ef4_farch_filter_spec *spec)
2062 {
2063 bool is_full = false;
2064
2065 /* *gen_spec should be completely initialised, to be consistent
2066 * with ef4_filter_init_{rx,tx}() and in case we want to copy
2067 * it back to userland.
2068 */
2069 memset(gen_spec, 0, sizeof(*gen_spec));
2070
2071 gen_spec->priority = spec->priority;
2072 gen_spec->flags = spec->flags;
2073 gen_spec->dmaq_id = spec->dmaq_id;
2074
2075 switch (spec->type) {
2076 case EF4_FARCH_FILTER_TCP_FULL:
2077 case EF4_FARCH_FILTER_UDP_FULL:
2078 is_full = true;
2079 fallthrough;
2080 case EF4_FARCH_FILTER_TCP_WILD:
2081 case EF4_FARCH_FILTER_UDP_WILD: {
2082 __be32 host1, host2;
2083 __be16 port1, port2;
2084
2085 gen_spec->match_flags =
2086 EF4_FILTER_MATCH_ETHER_TYPE |
2087 EF4_FILTER_MATCH_IP_PROTO |
2088 EF4_FILTER_MATCH_LOC_HOST | EF4_FILTER_MATCH_LOC_PORT;
2089 if (is_full)
2090 gen_spec->match_flags |= (EF4_FILTER_MATCH_REM_HOST |
2091 EF4_FILTER_MATCH_REM_PORT);
2092 gen_spec->ether_type = htons(ETH_P_IP);
2093 gen_spec->ip_proto =
2094 (spec->type == EF4_FARCH_FILTER_TCP_FULL ||
2095 spec->type == EF4_FARCH_FILTER_TCP_WILD) ?
2096 IPPROTO_TCP : IPPROTO_UDP;
2097
2098 host1 = htonl(spec->data[0] >> 16 | spec->data[1] << 16);
2099 port1 = htons(spec->data[0]);
2100 host2 = htonl(spec->data[2]);
2101 port2 = htons(spec->data[1] >> 16);
2102 if (spec->flags & EF4_FILTER_FLAG_TX) {
2103 gen_spec->loc_host[0] = host1;
2104 gen_spec->rem_host[0] = host2;
2105 } else {
2106 gen_spec->loc_host[0] = host2;
2107 gen_spec->rem_host[0] = host1;
2108 }
2109 if (!!(gen_spec->flags & EF4_FILTER_FLAG_TX) ^
2110 (!is_full && gen_spec->ip_proto == IPPROTO_UDP)) {
2111 gen_spec->loc_port = port1;
2112 gen_spec->rem_port = port2;
2113 } else {
2114 gen_spec->loc_port = port2;
2115 gen_spec->rem_port = port1;
2116 }
2117
2118 break;
2119 }
2120
2121 case EF4_FARCH_FILTER_MAC_FULL:
2122 is_full = true;
2123 fallthrough;
2124 case EF4_FARCH_FILTER_MAC_WILD:
2125 gen_spec->match_flags = EF4_FILTER_MATCH_LOC_MAC;
2126 if (is_full)
2127 gen_spec->match_flags |= EF4_FILTER_MATCH_OUTER_VID;
2128 gen_spec->loc_mac[0] = spec->data[2] >> 8;
2129 gen_spec->loc_mac[1] = spec->data[2];
2130 gen_spec->loc_mac[2] = spec->data[1] >> 24;
2131 gen_spec->loc_mac[3] = spec->data[1] >> 16;
2132 gen_spec->loc_mac[4] = spec->data[1] >> 8;
2133 gen_spec->loc_mac[5] = spec->data[1];
2134 gen_spec->outer_vid = htons(spec->data[0]);
2135 break;
2136
2137 case EF4_FARCH_FILTER_UC_DEF:
2138 case EF4_FARCH_FILTER_MC_DEF:
2139 gen_spec->match_flags = EF4_FILTER_MATCH_LOC_MAC_IG;
2140 gen_spec->loc_mac[0] = spec->type == EF4_FARCH_FILTER_MC_DEF;
2141 break;
2142
2143 default:
2144 WARN_ON(1);
2145 break;
2146 }
2147 }
2148
2149 static void
ef4_farch_filter_init_rx_auto(struct ef4_nic * efx,struct ef4_farch_filter_spec * spec)2150 ef4_farch_filter_init_rx_auto(struct ef4_nic *efx,
2151 struct ef4_farch_filter_spec *spec)
2152 {
2153 /* If there's only one channel then disable RSS for non VF
2154 * traffic, thereby allowing VFs to use RSS when the PF can't.
2155 */
2156 spec->priority = EF4_FILTER_PRI_AUTO;
2157 spec->flags = (EF4_FILTER_FLAG_RX |
2158 (ef4_rss_enabled(efx) ? EF4_FILTER_FLAG_RX_RSS : 0) |
2159 (efx->rx_scatter ? EF4_FILTER_FLAG_RX_SCATTER : 0));
2160 spec->dmaq_id = 0;
2161 }
2162
2163 /* Build a filter entry and return its n-tuple key. */
ef4_farch_filter_build(ef4_oword_t * filter,struct ef4_farch_filter_spec * spec)2164 static u32 ef4_farch_filter_build(ef4_oword_t *filter,
2165 struct ef4_farch_filter_spec *spec)
2166 {
2167 u32 data3;
2168
2169 switch (ef4_farch_filter_spec_table_id(spec)) {
2170 case EF4_FARCH_FILTER_TABLE_RX_IP: {
2171 bool is_udp = (spec->type == EF4_FARCH_FILTER_UDP_FULL ||
2172 spec->type == EF4_FARCH_FILTER_UDP_WILD);
2173 EF4_POPULATE_OWORD_7(
2174 *filter,
2175 FRF_BZ_RSS_EN,
2176 !!(spec->flags & EF4_FILTER_FLAG_RX_RSS),
2177 FRF_BZ_SCATTER_EN,
2178 !!(spec->flags & EF4_FILTER_FLAG_RX_SCATTER),
2179 FRF_BZ_TCP_UDP, is_udp,
2180 FRF_BZ_RXQ_ID, spec->dmaq_id,
2181 EF4_DWORD_2, spec->data[2],
2182 EF4_DWORD_1, spec->data[1],
2183 EF4_DWORD_0, spec->data[0]);
2184 data3 = is_udp;
2185 break;
2186 }
2187
2188 case EF4_FARCH_FILTER_TABLE_RX_MAC: {
2189 bool is_wild = spec->type == EF4_FARCH_FILTER_MAC_WILD;
2190 EF4_POPULATE_OWORD_7(
2191 *filter,
2192 FRF_CZ_RMFT_RSS_EN,
2193 !!(spec->flags & EF4_FILTER_FLAG_RX_RSS),
2194 FRF_CZ_RMFT_SCATTER_EN,
2195 !!(spec->flags & EF4_FILTER_FLAG_RX_SCATTER),
2196 FRF_CZ_RMFT_RXQ_ID, spec->dmaq_id,
2197 FRF_CZ_RMFT_WILDCARD_MATCH, is_wild,
2198 FRF_CZ_RMFT_DEST_MAC_HI, spec->data[2],
2199 FRF_CZ_RMFT_DEST_MAC_LO, spec->data[1],
2200 FRF_CZ_RMFT_VLAN_ID, spec->data[0]);
2201 data3 = is_wild;
2202 break;
2203 }
2204
2205 case EF4_FARCH_FILTER_TABLE_TX_MAC: {
2206 bool is_wild = spec->type == EF4_FARCH_FILTER_MAC_WILD;
2207 EF4_POPULATE_OWORD_5(*filter,
2208 FRF_CZ_TMFT_TXQ_ID, spec->dmaq_id,
2209 FRF_CZ_TMFT_WILDCARD_MATCH, is_wild,
2210 FRF_CZ_TMFT_SRC_MAC_HI, spec->data[2],
2211 FRF_CZ_TMFT_SRC_MAC_LO, spec->data[1],
2212 FRF_CZ_TMFT_VLAN_ID, spec->data[0]);
2213 data3 = is_wild | spec->dmaq_id << 1;
2214 break;
2215 }
2216
2217 default:
2218 BUG();
2219 }
2220
2221 return spec->data[0] ^ spec->data[1] ^ spec->data[2] ^ data3;
2222 }
2223
ef4_farch_filter_equal(const struct ef4_farch_filter_spec * left,const struct ef4_farch_filter_spec * right)2224 static bool ef4_farch_filter_equal(const struct ef4_farch_filter_spec *left,
2225 const struct ef4_farch_filter_spec *right)
2226 {
2227 if (left->type != right->type ||
2228 memcmp(left->data, right->data, sizeof(left->data)))
2229 return false;
2230
2231 if (left->flags & EF4_FILTER_FLAG_TX &&
2232 left->dmaq_id != right->dmaq_id)
2233 return false;
2234
2235 return true;
2236 }
2237
2238 /*
2239 * Construct/deconstruct external filter IDs. At least the RX filter
2240 * IDs must be ordered by matching priority, for RX NFC semantics.
2241 *
2242 * Deconstruction needs to be robust against invalid IDs so that
2243 * ef4_filter_remove_id_safe() and ef4_filter_get_filter_safe() can
2244 * accept user-provided IDs.
2245 */
2246
2247 #define EF4_FARCH_FILTER_MATCH_PRI_COUNT 5
2248
2249 static const u8 ef4_farch_filter_type_match_pri[EF4_FARCH_FILTER_TYPE_COUNT] = {
2250 [EF4_FARCH_FILTER_TCP_FULL] = 0,
2251 [EF4_FARCH_FILTER_UDP_FULL] = 0,
2252 [EF4_FARCH_FILTER_TCP_WILD] = 1,
2253 [EF4_FARCH_FILTER_UDP_WILD] = 1,
2254 [EF4_FARCH_FILTER_MAC_FULL] = 2,
2255 [EF4_FARCH_FILTER_MAC_WILD] = 3,
2256 [EF4_FARCH_FILTER_UC_DEF] = 4,
2257 [EF4_FARCH_FILTER_MC_DEF] = 4,
2258 };
2259
2260 static const enum ef4_farch_filter_table_id ef4_farch_filter_range_table[] = {
2261 EF4_FARCH_FILTER_TABLE_RX_IP, /* RX match pri 0 */
2262 EF4_FARCH_FILTER_TABLE_RX_IP,
2263 EF4_FARCH_FILTER_TABLE_RX_MAC,
2264 EF4_FARCH_FILTER_TABLE_RX_MAC,
2265 EF4_FARCH_FILTER_TABLE_RX_DEF, /* RX match pri 4 */
2266 EF4_FARCH_FILTER_TABLE_TX_MAC, /* TX match pri 0 */
2267 EF4_FARCH_FILTER_TABLE_TX_MAC, /* TX match pri 1 */
2268 };
2269
2270 #define EF4_FARCH_FILTER_INDEX_WIDTH 13
2271 #define EF4_FARCH_FILTER_INDEX_MASK ((1 << EF4_FARCH_FILTER_INDEX_WIDTH) - 1)
2272
2273 static inline u32
ef4_farch_filter_make_id(const struct ef4_farch_filter_spec * spec,unsigned int index)2274 ef4_farch_filter_make_id(const struct ef4_farch_filter_spec *spec,
2275 unsigned int index)
2276 {
2277 unsigned int range;
2278
2279 range = ef4_farch_filter_type_match_pri[spec->type];
2280 if (!(spec->flags & EF4_FILTER_FLAG_RX))
2281 range += EF4_FARCH_FILTER_MATCH_PRI_COUNT;
2282
2283 return range << EF4_FARCH_FILTER_INDEX_WIDTH | index;
2284 }
2285
2286 static inline enum ef4_farch_filter_table_id
ef4_farch_filter_id_table_id(u32 id)2287 ef4_farch_filter_id_table_id(u32 id)
2288 {
2289 unsigned int range = id >> EF4_FARCH_FILTER_INDEX_WIDTH;
2290
2291 if (range < ARRAY_SIZE(ef4_farch_filter_range_table))
2292 return ef4_farch_filter_range_table[range];
2293 else
2294 return EF4_FARCH_FILTER_TABLE_COUNT; /* invalid */
2295 }
2296
ef4_farch_filter_id_index(u32 id)2297 static inline unsigned int ef4_farch_filter_id_index(u32 id)
2298 {
2299 return id & EF4_FARCH_FILTER_INDEX_MASK;
2300 }
2301
ef4_farch_filter_get_rx_id_limit(struct ef4_nic * efx)2302 u32 ef4_farch_filter_get_rx_id_limit(struct ef4_nic *efx)
2303 {
2304 struct ef4_farch_filter_state *state = efx->filter_state;
2305 unsigned int range = EF4_FARCH_FILTER_MATCH_PRI_COUNT - 1;
2306 enum ef4_farch_filter_table_id table_id;
2307
2308 do {
2309 table_id = ef4_farch_filter_range_table[range];
2310 if (state->table[table_id].size != 0)
2311 return range << EF4_FARCH_FILTER_INDEX_WIDTH |
2312 state->table[table_id].size;
2313 } while (range--);
2314
2315 return 0;
2316 }
2317
ef4_farch_filter_insert(struct ef4_nic * efx,struct ef4_filter_spec * gen_spec,bool replace_equal)2318 s32 ef4_farch_filter_insert(struct ef4_nic *efx,
2319 struct ef4_filter_spec *gen_spec,
2320 bool replace_equal)
2321 {
2322 struct ef4_farch_filter_state *state = efx->filter_state;
2323 struct ef4_farch_filter_table *table;
2324 struct ef4_farch_filter_spec spec;
2325 ef4_oword_t filter;
2326 int rep_index, ins_index;
2327 unsigned int depth = 0;
2328 int rc;
2329
2330 rc = ef4_farch_filter_from_gen_spec(&spec, gen_spec);
2331 if (rc)
2332 return rc;
2333
2334 table = &state->table[ef4_farch_filter_spec_table_id(&spec)];
2335 if (table->size == 0)
2336 return -EINVAL;
2337
2338 netif_vdbg(efx, hw, efx->net_dev,
2339 "%s: type %d search_limit=%d", __func__, spec.type,
2340 table->search_limit[spec.type]);
2341
2342 if (table->id == EF4_FARCH_FILTER_TABLE_RX_DEF) {
2343 /* One filter spec per type */
2344 BUILD_BUG_ON(EF4_FARCH_FILTER_INDEX_UC_DEF != 0);
2345 BUILD_BUG_ON(EF4_FARCH_FILTER_INDEX_MC_DEF !=
2346 EF4_FARCH_FILTER_MC_DEF - EF4_FARCH_FILTER_UC_DEF);
2347 rep_index = spec.type - EF4_FARCH_FILTER_UC_DEF;
2348 ins_index = rep_index;
2349
2350 spin_lock_bh(&efx->filter_lock);
2351 } else {
2352 /* Search concurrently for
2353 * (1) a filter to be replaced (rep_index): any filter
2354 * with the same match values, up to the current
2355 * search depth for this type, and
2356 * (2) the insertion point (ins_index): (1) or any
2357 * free slot before it or up to the maximum search
2358 * depth for this priority
2359 * We fail if we cannot find (2).
2360 *
2361 * We can stop once either
2362 * (a) we find (1), in which case we have definitely
2363 * found (2) as well; or
2364 * (b) we have searched exhaustively for (1), and have
2365 * either found (2) or searched exhaustively for it
2366 */
2367 u32 key = ef4_farch_filter_build(&filter, &spec);
2368 unsigned int hash = ef4_farch_filter_hash(key);
2369 unsigned int incr = ef4_farch_filter_increment(key);
2370 unsigned int max_rep_depth = table->search_limit[spec.type];
2371 unsigned int max_ins_depth =
2372 spec.priority <= EF4_FILTER_PRI_HINT ?
2373 EF4_FARCH_FILTER_CTL_SRCH_HINT_MAX :
2374 EF4_FARCH_FILTER_CTL_SRCH_MAX;
2375 unsigned int i = hash & (table->size - 1);
2376
2377 ins_index = -1;
2378 depth = 1;
2379
2380 spin_lock_bh(&efx->filter_lock);
2381
2382 for (;;) {
2383 if (!test_bit(i, table->used_bitmap)) {
2384 if (ins_index < 0)
2385 ins_index = i;
2386 } else if (ef4_farch_filter_equal(&spec,
2387 &table->spec[i])) {
2388 /* Case (a) */
2389 if (ins_index < 0)
2390 ins_index = i;
2391 rep_index = i;
2392 break;
2393 }
2394
2395 if (depth >= max_rep_depth &&
2396 (ins_index >= 0 || depth >= max_ins_depth)) {
2397 /* Case (b) */
2398 if (ins_index < 0) {
2399 rc = -EBUSY;
2400 goto out;
2401 }
2402 rep_index = -1;
2403 break;
2404 }
2405
2406 i = (i + incr) & (table->size - 1);
2407 ++depth;
2408 }
2409 }
2410
2411 /* If we found a filter to be replaced, check whether we
2412 * should do so
2413 */
2414 if (rep_index >= 0) {
2415 struct ef4_farch_filter_spec *saved_spec =
2416 &table->spec[rep_index];
2417
2418 if (spec.priority == saved_spec->priority && !replace_equal) {
2419 rc = -EEXIST;
2420 goto out;
2421 }
2422 if (spec.priority < saved_spec->priority) {
2423 rc = -EPERM;
2424 goto out;
2425 }
2426 if (saved_spec->priority == EF4_FILTER_PRI_AUTO ||
2427 saved_spec->flags & EF4_FILTER_FLAG_RX_OVER_AUTO)
2428 spec.flags |= EF4_FILTER_FLAG_RX_OVER_AUTO;
2429 }
2430
2431 /* Insert the filter */
2432 if (ins_index != rep_index) {
2433 __set_bit(ins_index, table->used_bitmap);
2434 ++table->used;
2435 }
2436 table->spec[ins_index] = spec;
2437
2438 if (table->id == EF4_FARCH_FILTER_TABLE_RX_DEF) {
2439 ef4_farch_filter_push_rx_config(efx);
2440 } else {
2441 if (table->search_limit[spec.type] < depth) {
2442 table->search_limit[spec.type] = depth;
2443 if (spec.flags & EF4_FILTER_FLAG_TX)
2444 ef4_farch_filter_push_tx_limits(efx);
2445 else
2446 ef4_farch_filter_push_rx_config(efx);
2447 }
2448
2449 ef4_writeo(efx, &filter,
2450 table->offset + table->step * ins_index);
2451
2452 /* If we were able to replace a filter by inserting
2453 * at a lower depth, clear the replaced filter
2454 */
2455 if (ins_index != rep_index && rep_index >= 0)
2456 ef4_farch_filter_table_clear_entry(efx, table,
2457 rep_index);
2458 }
2459
2460 netif_vdbg(efx, hw, efx->net_dev,
2461 "%s: filter type %d index %d rxq %u set",
2462 __func__, spec.type, ins_index, spec.dmaq_id);
2463 rc = ef4_farch_filter_make_id(&spec, ins_index);
2464
2465 out:
2466 spin_unlock_bh(&efx->filter_lock);
2467 return rc;
2468 }
2469
2470 static void
ef4_farch_filter_table_clear_entry(struct ef4_nic * efx,struct ef4_farch_filter_table * table,unsigned int filter_idx)2471 ef4_farch_filter_table_clear_entry(struct ef4_nic *efx,
2472 struct ef4_farch_filter_table *table,
2473 unsigned int filter_idx)
2474 {
2475 static ef4_oword_t filter;
2476
2477 EF4_WARN_ON_PARANOID(!test_bit(filter_idx, table->used_bitmap));
2478 BUG_ON(table->offset == 0); /* can't clear MAC default filters */
2479
2480 __clear_bit(filter_idx, table->used_bitmap);
2481 --table->used;
2482 memset(&table->spec[filter_idx], 0, sizeof(table->spec[0]));
2483
2484 ef4_writeo(efx, &filter, table->offset + table->step * filter_idx);
2485
2486 /* If this filter required a greater search depth than
2487 * any other, the search limit for its type can now be
2488 * decreased. However, it is hard to determine that
2489 * unless the table has become completely empty - in
2490 * which case, all its search limits can be set to 0.
2491 */
2492 if (unlikely(table->used == 0)) {
2493 memset(table->search_limit, 0, sizeof(table->search_limit));
2494 if (table->id == EF4_FARCH_FILTER_TABLE_TX_MAC)
2495 ef4_farch_filter_push_tx_limits(efx);
2496 else
2497 ef4_farch_filter_push_rx_config(efx);
2498 }
2499 }
2500
ef4_farch_filter_remove(struct ef4_nic * efx,struct ef4_farch_filter_table * table,unsigned int filter_idx,enum ef4_filter_priority priority)2501 static int ef4_farch_filter_remove(struct ef4_nic *efx,
2502 struct ef4_farch_filter_table *table,
2503 unsigned int filter_idx,
2504 enum ef4_filter_priority priority)
2505 {
2506 struct ef4_farch_filter_spec *spec = &table->spec[filter_idx];
2507
2508 if (!test_bit(filter_idx, table->used_bitmap) ||
2509 spec->priority != priority)
2510 return -ENOENT;
2511
2512 if (spec->flags & EF4_FILTER_FLAG_RX_OVER_AUTO) {
2513 ef4_farch_filter_init_rx_auto(efx, spec);
2514 ef4_farch_filter_push_rx_config(efx);
2515 } else {
2516 ef4_farch_filter_table_clear_entry(efx, table, filter_idx);
2517 }
2518
2519 return 0;
2520 }
2521
ef4_farch_filter_remove_safe(struct ef4_nic * efx,enum ef4_filter_priority priority,u32 filter_id)2522 int ef4_farch_filter_remove_safe(struct ef4_nic *efx,
2523 enum ef4_filter_priority priority,
2524 u32 filter_id)
2525 {
2526 struct ef4_farch_filter_state *state = efx->filter_state;
2527 enum ef4_farch_filter_table_id table_id;
2528 struct ef4_farch_filter_table *table;
2529 unsigned int filter_idx;
2530 int rc;
2531
2532 table_id = ef4_farch_filter_id_table_id(filter_id);
2533 if ((unsigned int)table_id >= EF4_FARCH_FILTER_TABLE_COUNT)
2534 return -ENOENT;
2535 table = &state->table[table_id];
2536
2537 filter_idx = ef4_farch_filter_id_index(filter_id);
2538 if (filter_idx >= table->size)
2539 return -ENOENT;
2540
2541 spin_lock_bh(&efx->filter_lock);
2542 rc = ef4_farch_filter_remove(efx, table, filter_idx, priority);
2543 spin_unlock_bh(&efx->filter_lock);
2544
2545 return rc;
2546 }
2547
ef4_farch_filter_get_safe(struct ef4_nic * efx,enum ef4_filter_priority priority,u32 filter_id,struct ef4_filter_spec * spec_buf)2548 int ef4_farch_filter_get_safe(struct ef4_nic *efx,
2549 enum ef4_filter_priority priority,
2550 u32 filter_id, struct ef4_filter_spec *spec_buf)
2551 {
2552 struct ef4_farch_filter_state *state = efx->filter_state;
2553 enum ef4_farch_filter_table_id table_id;
2554 struct ef4_farch_filter_table *table;
2555 struct ef4_farch_filter_spec *spec;
2556 unsigned int filter_idx;
2557 int rc;
2558
2559 table_id = ef4_farch_filter_id_table_id(filter_id);
2560 if ((unsigned int)table_id >= EF4_FARCH_FILTER_TABLE_COUNT)
2561 return -ENOENT;
2562 table = &state->table[table_id];
2563
2564 filter_idx = ef4_farch_filter_id_index(filter_id);
2565 if (filter_idx >= table->size)
2566 return -ENOENT;
2567 spec = &table->spec[filter_idx];
2568
2569 spin_lock_bh(&efx->filter_lock);
2570
2571 if (test_bit(filter_idx, table->used_bitmap) &&
2572 spec->priority == priority) {
2573 ef4_farch_filter_to_gen_spec(spec_buf, spec);
2574 rc = 0;
2575 } else {
2576 rc = -ENOENT;
2577 }
2578
2579 spin_unlock_bh(&efx->filter_lock);
2580
2581 return rc;
2582 }
2583
2584 static void
ef4_farch_filter_table_clear(struct ef4_nic * efx,enum ef4_farch_filter_table_id table_id,enum ef4_filter_priority priority)2585 ef4_farch_filter_table_clear(struct ef4_nic *efx,
2586 enum ef4_farch_filter_table_id table_id,
2587 enum ef4_filter_priority priority)
2588 {
2589 struct ef4_farch_filter_state *state = efx->filter_state;
2590 struct ef4_farch_filter_table *table = &state->table[table_id];
2591 unsigned int filter_idx;
2592
2593 spin_lock_bh(&efx->filter_lock);
2594 for (filter_idx = 0; filter_idx < table->size; ++filter_idx) {
2595 if (table->spec[filter_idx].priority != EF4_FILTER_PRI_AUTO)
2596 ef4_farch_filter_remove(efx, table,
2597 filter_idx, priority);
2598 }
2599 spin_unlock_bh(&efx->filter_lock);
2600 }
2601
ef4_farch_filter_clear_rx(struct ef4_nic * efx,enum ef4_filter_priority priority)2602 int ef4_farch_filter_clear_rx(struct ef4_nic *efx,
2603 enum ef4_filter_priority priority)
2604 {
2605 ef4_farch_filter_table_clear(efx, EF4_FARCH_FILTER_TABLE_RX_IP,
2606 priority);
2607 ef4_farch_filter_table_clear(efx, EF4_FARCH_FILTER_TABLE_RX_MAC,
2608 priority);
2609 ef4_farch_filter_table_clear(efx, EF4_FARCH_FILTER_TABLE_RX_DEF,
2610 priority);
2611 return 0;
2612 }
2613
ef4_farch_filter_count_rx_used(struct ef4_nic * efx,enum ef4_filter_priority priority)2614 u32 ef4_farch_filter_count_rx_used(struct ef4_nic *efx,
2615 enum ef4_filter_priority priority)
2616 {
2617 struct ef4_farch_filter_state *state = efx->filter_state;
2618 enum ef4_farch_filter_table_id table_id;
2619 struct ef4_farch_filter_table *table;
2620 unsigned int filter_idx;
2621 u32 count = 0;
2622
2623 spin_lock_bh(&efx->filter_lock);
2624
2625 for (table_id = EF4_FARCH_FILTER_TABLE_RX_IP;
2626 table_id <= EF4_FARCH_FILTER_TABLE_RX_DEF;
2627 table_id++) {
2628 table = &state->table[table_id];
2629 for (filter_idx = 0; filter_idx < table->size; filter_idx++) {
2630 if (test_bit(filter_idx, table->used_bitmap) &&
2631 table->spec[filter_idx].priority == priority)
2632 ++count;
2633 }
2634 }
2635
2636 spin_unlock_bh(&efx->filter_lock);
2637
2638 return count;
2639 }
2640
ef4_farch_filter_get_rx_ids(struct ef4_nic * efx,enum ef4_filter_priority priority,u32 * buf,u32 size)2641 s32 ef4_farch_filter_get_rx_ids(struct ef4_nic *efx,
2642 enum ef4_filter_priority priority,
2643 u32 *buf, u32 size)
2644 {
2645 struct ef4_farch_filter_state *state = efx->filter_state;
2646 enum ef4_farch_filter_table_id table_id;
2647 struct ef4_farch_filter_table *table;
2648 unsigned int filter_idx;
2649 s32 count = 0;
2650
2651 spin_lock_bh(&efx->filter_lock);
2652
2653 for (table_id = EF4_FARCH_FILTER_TABLE_RX_IP;
2654 table_id <= EF4_FARCH_FILTER_TABLE_RX_DEF;
2655 table_id++) {
2656 table = &state->table[table_id];
2657 for (filter_idx = 0; filter_idx < table->size; filter_idx++) {
2658 if (test_bit(filter_idx, table->used_bitmap) &&
2659 table->spec[filter_idx].priority == priority) {
2660 if (count == size) {
2661 count = -EMSGSIZE;
2662 goto out;
2663 }
2664 buf[count++] = ef4_farch_filter_make_id(
2665 &table->spec[filter_idx], filter_idx);
2666 }
2667 }
2668 }
2669 out:
2670 spin_unlock_bh(&efx->filter_lock);
2671
2672 return count;
2673 }
2674
2675 /* Restore filter stater after reset */
ef4_farch_filter_table_restore(struct ef4_nic * efx)2676 void ef4_farch_filter_table_restore(struct ef4_nic *efx)
2677 {
2678 struct ef4_farch_filter_state *state = efx->filter_state;
2679 enum ef4_farch_filter_table_id table_id;
2680 struct ef4_farch_filter_table *table;
2681 ef4_oword_t filter;
2682 unsigned int filter_idx;
2683
2684 spin_lock_bh(&efx->filter_lock);
2685
2686 for (table_id = 0; table_id < EF4_FARCH_FILTER_TABLE_COUNT; table_id++) {
2687 table = &state->table[table_id];
2688
2689 /* Check whether this is a regular register table */
2690 if (table->step == 0)
2691 continue;
2692
2693 for (filter_idx = 0; filter_idx < table->size; filter_idx++) {
2694 if (!test_bit(filter_idx, table->used_bitmap))
2695 continue;
2696 ef4_farch_filter_build(&filter, &table->spec[filter_idx]);
2697 ef4_writeo(efx, &filter,
2698 table->offset + table->step * filter_idx);
2699 }
2700 }
2701
2702 ef4_farch_filter_push_rx_config(efx);
2703 ef4_farch_filter_push_tx_limits(efx);
2704
2705 spin_unlock_bh(&efx->filter_lock);
2706 }
2707
ef4_farch_filter_table_remove(struct ef4_nic * efx)2708 void ef4_farch_filter_table_remove(struct ef4_nic *efx)
2709 {
2710 struct ef4_farch_filter_state *state = efx->filter_state;
2711 enum ef4_farch_filter_table_id table_id;
2712
2713 for (table_id = 0; table_id < EF4_FARCH_FILTER_TABLE_COUNT; table_id++) {
2714 kfree(state->table[table_id].used_bitmap);
2715 vfree(state->table[table_id].spec);
2716 }
2717 kfree(state);
2718 }
2719
ef4_farch_filter_table_probe(struct ef4_nic * efx)2720 int ef4_farch_filter_table_probe(struct ef4_nic *efx)
2721 {
2722 struct ef4_farch_filter_state *state;
2723 struct ef4_farch_filter_table *table;
2724 unsigned table_id;
2725
2726 state = kzalloc(sizeof(struct ef4_farch_filter_state), GFP_KERNEL);
2727 if (!state)
2728 return -ENOMEM;
2729 efx->filter_state = state;
2730
2731 if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) {
2732 table = &state->table[EF4_FARCH_FILTER_TABLE_RX_IP];
2733 table->id = EF4_FARCH_FILTER_TABLE_RX_IP;
2734 table->offset = FR_BZ_RX_FILTER_TBL0;
2735 table->size = FR_BZ_RX_FILTER_TBL0_ROWS;
2736 table->step = FR_BZ_RX_FILTER_TBL0_STEP;
2737 }
2738
2739 for (table_id = 0; table_id < EF4_FARCH_FILTER_TABLE_COUNT; table_id++) {
2740 table = &state->table[table_id];
2741 if (table->size == 0)
2742 continue;
2743 table->used_bitmap = kcalloc(BITS_TO_LONGS(table->size),
2744 sizeof(unsigned long),
2745 GFP_KERNEL);
2746 if (!table->used_bitmap)
2747 goto fail;
2748 table->spec = vzalloc(array_size(sizeof(*table->spec),
2749 table->size));
2750 if (!table->spec)
2751 goto fail;
2752 }
2753
2754 table = &state->table[EF4_FARCH_FILTER_TABLE_RX_DEF];
2755 if (table->size) {
2756 /* RX default filters must always exist */
2757 struct ef4_farch_filter_spec *spec;
2758 unsigned i;
2759
2760 for (i = 0; i < EF4_FARCH_FILTER_SIZE_RX_DEF; i++) {
2761 spec = &table->spec[i];
2762 spec->type = EF4_FARCH_FILTER_UC_DEF + i;
2763 ef4_farch_filter_init_rx_auto(efx, spec);
2764 __set_bit(i, table->used_bitmap);
2765 }
2766 }
2767
2768 ef4_farch_filter_push_rx_config(efx);
2769
2770 return 0;
2771
2772 fail:
2773 ef4_farch_filter_table_remove(efx);
2774 return -ENOMEM;
2775 }
2776
2777 /* Update scatter enable flags for filters pointing to our own RX queues */
ef4_farch_filter_update_rx_scatter(struct ef4_nic * efx)2778 void ef4_farch_filter_update_rx_scatter(struct ef4_nic *efx)
2779 {
2780 struct ef4_farch_filter_state *state = efx->filter_state;
2781 enum ef4_farch_filter_table_id table_id;
2782 struct ef4_farch_filter_table *table;
2783 ef4_oword_t filter;
2784 unsigned int filter_idx;
2785
2786 spin_lock_bh(&efx->filter_lock);
2787
2788 for (table_id = EF4_FARCH_FILTER_TABLE_RX_IP;
2789 table_id <= EF4_FARCH_FILTER_TABLE_RX_DEF;
2790 table_id++) {
2791 table = &state->table[table_id];
2792
2793 for (filter_idx = 0; filter_idx < table->size; filter_idx++) {
2794 if (!test_bit(filter_idx, table->used_bitmap) ||
2795 table->spec[filter_idx].dmaq_id >=
2796 efx->n_rx_channels)
2797 continue;
2798
2799 if (efx->rx_scatter)
2800 table->spec[filter_idx].flags |=
2801 EF4_FILTER_FLAG_RX_SCATTER;
2802 else
2803 table->spec[filter_idx].flags &=
2804 ~EF4_FILTER_FLAG_RX_SCATTER;
2805
2806 if (table_id == EF4_FARCH_FILTER_TABLE_RX_DEF)
2807 /* Pushed by ef4_farch_filter_push_rx_config() */
2808 continue;
2809
2810 ef4_farch_filter_build(&filter, &table->spec[filter_idx]);
2811 ef4_writeo(efx, &filter,
2812 table->offset + table->step * filter_idx);
2813 }
2814 }
2815
2816 ef4_farch_filter_push_rx_config(efx);
2817
2818 spin_unlock_bh(&efx->filter_lock);
2819 }
2820
2821 #ifdef CONFIG_RFS_ACCEL
2822
ef4_farch_filter_rfs_insert(struct ef4_nic * efx,struct ef4_filter_spec * gen_spec)2823 s32 ef4_farch_filter_rfs_insert(struct ef4_nic *efx,
2824 struct ef4_filter_spec *gen_spec)
2825 {
2826 return ef4_farch_filter_insert(efx, gen_spec, true);
2827 }
2828
ef4_farch_filter_rfs_expire_one(struct ef4_nic * efx,u32 flow_id,unsigned int index)2829 bool ef4_farch_filter_rfs_expire_one(struct ef4_nic *efx, u32 flow_id,
2830 unsigned int index)
2831 {
2832 struct ef4_farch_filter_state *state = efx->filter_state;
2833 struct ef4_farch_filter_table *table =
2834 &state->table[EF4_FARCH_FILTER_TABLE_RX_IP];
2835
2836 if (test_bit(index, table->used_bitmap) &&
2837 table->spec[index].priority == EF4_FILTER_PRI_HINT &&
2838 rps_may_expire_flow(efx->net_dev, table->spec[index].dmaq_id,
2839 flow_id, index)) {
2840 ef4_farch_filter_table_clear_entry(efx, table, index);
2841 return true;
2842 }
2843
2844 return false;
2845 }
2846
2847 #endif /* CONFIG_RFS_ACCEL */
2848
ef4_farch_filter_sync_rx_mode(struct ef4_nic * efx)2849 void ef4_farch_filter_sync_rx_mode(struct ef4_nic *efx)
2850 {
2851 struct net_device *net_dev = efx->net_dev;
2852 struct netdev_hw_addr *ha;
2853 union ef4_multicast_hash *mc_hash = &efx->multicast_hash;
2854 u32 crc;
2855 int bit;
2856
2857 if (!ef4_dev_registered(efx))
2858 return;
2859
2860 netif_addr_lock_bh(net_dev);
2861
2862 efx->unicast_filter = !(net_dev->flags & IFF_PROMISC);
2863
2864 /* Build multicast hash table */
2865 if (net_dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
2866 memset(mc_hash, 0xff, sizeof(*mc_hash));
2867 } else {
2868 memset(mc_hash, 0x00, sizeof(*mc_hash));
2869 netdev_for_each_mc_addr(ha, net_dev) {
2870 crc = ether_crc_le(ETH_ALEN, ha->addr);
2871 bit = crc & (EF4_MCAST_HASH_ENTRIES - 1);
2872 __set_bit_le(bit, mc_hash);
2873 }
2874
2875 /* Broadcast packets go through the multicast hash filter.
2876 * ether_crc_le() of the broadcast address is 0xbe2612ff
2877 * so we always add bit 0xff to the mask.
2878 */
2879 __set_bit_le(0xff, mc_hash);
2880 }
2881
2882 netif_addr_unlock_bh(net_dev);
2883 }
2884