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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 11:45:48 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 11:45:48 -0400
commit95dfec6ae1cb8c03406aac612a5642cbddb676b3 (patch)
tree978de715f45de94a8e79eb08a08ca5fb9dfd9dea /drivers/net/sfc/falcon.c
parentae3a0064e6d69068b1c9fd075095da062430bda9 (diff)
parent159131149c2f56c1da5ae5e23ab9d5acef4916d1 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (53 commits) tcp: Overflow bug in Vegas [IPv4] UFO: prevent generation of chained skb destined to UFO device iwlwifi: move the selects to the tristate drivers ipv4: annotate a few functions __init in ipconfig.c atm: ambassador: vcc_sf semaphore to mutex MAINTAINERS: The socketcan-core list is subscribers-only. netfilter: nf_conntrack: padding breaks conntrack hash on ARM ipv4: Update MTU to all related cache entries in ip_rt_frag_needed() sch_sfq: use del_timer_sync() in sfq_destroy() net: Add compat support for getsockopt (MCAST_MSFILTER) net: Several cleanups for the setsockopt compat support. ipvs: fix oops in backup for fwmark conn templates bridge: kernel panic when unloading bridge module bridge: fix error handling in br_add_if() netfilter: {nfnetlink,ip,ip6}_queue: fix skb_over_panic when enlarging packets netfilter: x_tables: fix net namespace leak when reading /proc/net/xxx_tables_names netfilter: xt_TCPOPTSTRIP: signed tcphoff for ipv6_skip_exthdr() retval tcp: Limit cwnd growth when deferring for GSO tcp: Allow send-limited cwnd to grow up to max_burst when gso disabled [netdrvr] gianfar: Determine TBIPA value dynamically ...
Diffstat (limited to 'drivers/net/sfc/falcon.c')
-rw-r--r--drivers/net/sfc/falcon.c2722
1 files changed, 2722 insertions, 0 deletions
diff --git a/drivers/net/sfc/falcon.c b/drivers/net/sfc/falcon.c
new file mode 100644
index 000000000000..46db549ce580
--- /dev/null
+++ b/drivers/net/sfc/falcon.c
@@ -0,0 +1,2722 @@
1/****************************************************************************
2 * Driver for Solarflare Solarstorm network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
4 * Copyright 2006-2008 Solarflare Communications Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation, incorporated herein by reference.
9 */
10
11#include <linux/bitops.h>
12#include <linux/delay.h>
13#include <linux/pci.h>
14#include <linux/module.h>
15#include <linux/seq_file.h>
16#include "net_driver.h"
17#include "bitfield.h"
18#include "efx.h"
19#include "mac.h"
20#include "gmii.h"
21#include "spi.h"
22#include "falcon.h"
23#include "falcon_hwdefs.h"
24#include "falcon_io.h"
25#include "mdio_10g.h"
26#include "phy.h"
27#include "boards.h"
28#include "workarounds.h"
29
30/* Falcon hardware control.
31 * Falcon is the internal codename for the SFC4000 controller that is
32 * present in SFE400X evaluation boards
33 */
34
35/**
36 * struct falcon_nic_data - Falcon NIC state
37 * @next_buffer_table: First available buffer table id
38 * @pci_dev2: The secondary PCI device if present
39 */
40struct falcon_nic_data {
41 unsigned next_buffer_table;
42 struct pci_dev *pci_dev2;
43};
44
45/**************************************************************************
46 *
47 * Configurable values
48 *
49 **************************************************************************
50 */
51
52static int disable_dma_stats;
53
54/* This is set to 16 for a good reason. In summary, if larger than
55 * 16, the descriptor cache holds more than a default socket
56 * buffer's worth of packets (for UDP we can only have at most one
57 * socket buffer's worth outstanding). This combined with the fact
58 * that we only get 1 TX event per descriptor cache means the NIC
59 * goes idle.
60 */
61#define TX_DC_ENTRIES 16
62#define TX_DC_ENTRIES_ORDER 0
63#define TX_DC_BASE 0x130000
64
65#define RX_DC_ENTRIES 64
66#define RX_DC_ENTRIES_ORDER 2
67#define RX_DC_BASE 0x100000
68
69/* RX FIFO XOFF watermark
70 *
71 * When the amount of the RX FIFO increases used increases past this
72 * watermark send XOFF. Only used if RX flow control is enabled (ethtool -A)
73 * This also has an effect on RX/TX arbitration
74 */
75static int rx_xoff_thresh_bytes = -1;
76module_param(rx_xoff_thresh_bytes, int, 0644);
77MODULE_PARM_DESC(rx_xoff_thresh_bytes, "RX fifo XOFF threshold");
78
79/* RX FIFO XON watermark
80 *
81 * When the amount of the RX FIFO used decreases below this
82 * watermark send XON. Only used if TX flow control is enabled (ethtool -A)
83 * This also has an effect on RX/TX arbitration
84 */
85static int rx_xon_thresh_bytes = -1;
86module_param(rx_xon_thresh_bytes, int, 0644);
87MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold");
88
89/* TX descriptor ring size - min 512 max 4k */
90#define FALCON_TXD_RING_ORDER TX_DESCQ_SIZE_1K
91#define FALCON_TXD_RING_SIZE 1024
92#define FALCON_TXD_RING_MASK (FALCON_TXD_RING_SIZE - 1)
93
94/* RX descriptor ring size - min 512 max 4k */
95#define FALCON_RXD_RING_ORDER RX_DESCQ_SIZE_1K
96#define FALCON_RXD_RING_SIZE 1024
97#define FALCON_RXD_RING_MASK (FALCON_RXD_RING_SIZE - 1)
98
99/* Event queue size - max 32k */
100#define FALCON_EVQ_ORDER EVQ_SIZE_4K
101#define FALCON_EVQ_SIZE 4096
102#define FALCON_EVQ_MASK (FALCON_EVQ_SIZE - 1)
103
104/* Max number of internal errors. After this resets will not be performed */
105#define FALCON_MAX_INT_ERRORS 4
106
107/* Maximum period that we wait for flush events. If the flush event
108 * doesn't arrive in this period of time then we check if the queue
109 * was disabled anyway. */
110#define FALCON_FLUSH_TIMEOUT 10 /* 10ms */
111
112/**************************************************************************
113 *
114 * Falcon constants
115 *
116 **************************************************************************
117 */
118
119/* DMA address mask (up to 46-bit, avoiding compiler warnings)
120 *
121 * Note that it is possible to have a platform with 64-bit longs and
122 * 32-bit DMA addresses, or vice versa. EFX_DMA_MASK takes care of the
123 * platform DMA mask.
124 */
125#if BITS_PER_LONG == 64
126#define FALCON_DMA_MASK EFX_DMA_MASK(0x00003fffffffffffUL)
127#else
128#define FALCON_DMA_MASK EFX_DMA_MASK(0x00003fffffffffffULL)
129#endif
130
131/* TX DMA length mask (13-bit) */
132#define FALCON_TX_DMA_MASK (4096 - 1)
133
134/* Size and alignment of special buffers (4KB) */
135#define FALCON_BUF_SIZE 4096
136
137/* Dummy SRAM size code */
138#define SRM_NB_BSZ_ONCHIP_ONLY (-1)
139
140/* Be nice if these (or equiv.) were in linux/pci_regs.h, but they're not. */
141#define PCI_EXP_DEVCAP_PWR_VAL_LBN 18
142#define PCI_EXP_DEVCAP_PWR_SCL_LBN 26
143#define PCI_EXP_DEVCTL_PAYLOAD_LBN 5
144#define PCI_EXP_LNKSTA_LNK_WID 0x3f0
145#define PCI_EXP_LNKSTA_LNK_WID_LBN 4
146
147#define FALCON_IS_DUAL_FUNC(efx) \
148 (FALCON_REV(efx) < FALCON_REV_B0)
149
150/**************************************************************************
151 *
152 * Falcon hardware access
153 *
154 **************************************************************************/
155
156/* Read the current event from the event queue */
157static inline efx_qword_t *falcon_event(struct efx_channel *channel,
158 unsigned int index)
159{
160 return (((efx_qword_t *) (channel->eventq.addr)) + index);
161}
162
163/* See if an event is present
164 *
165 * We check both the high and low dword of the event for all ones. We
166 * wrote all ones when we cleared the event, and no valid event can
167 * have all ones in either its high or low dwords. This approach is
168 * robust against reordering.
169 *
170 * Note that using a single 64-bit comparison is incorrect; even
171 * though the CPU read will be atomic, the DMA write may not be.
172 */
173static inline int falcon_event_present(efx_qword_t *event)
174{
175 return (!(EFX_DWORD_IS_ALL_ONES(event->dword[0]) |
176 EFX_DWORD_IS_ALL_ONES(event->dword[1])));
177}
178
179/**************************************************************************
180 *
181 * I2C bus - this is a bit-bashing interface using GPIO pins
182 * Note that it uses the output enables to tristate the outputs
183 * SDA is the data pin and SCL is the clock
184 *
185 **************************************************************************
186 */
187static void falcon_setsdascl(struct efx_i2c_interface *i2c)
188{
189 efx_oword_t reg;
190
191 falcon_read(i2c->efx, &reg, GPIO_CTL_REG_KER);
192 EFX_SET_OWORD_FIELD(reg, GPIO0_OEN, (i2c->scl ? 0 : 1));
193 EFX_SET_OWORD_FIELD(reg, GPIO3_OEN, (i2c->sda ? 0 : 1));
194 falcon_write(i2c->efx, &reg, GPIO_CTL_REG_KER);
195}
196
197static int falcon_getsda(struct efx_i2c_interface *i2c)
198{
199 efx_oword_t reg;
200
201 falcon_read(i2c->efx, &reg, GPIO_CTL_REG_KER);
202 return EFX_OWORD_FIELD(reg, GPIO3_IN);
203}
204
205static int falcon_getscl(struct efx_i2c_interface *i2c)
206{
207 efx_oword_t reg;
208
209 falcon_read(i2c->efx, &reg, GPIO_CTL_REG_KER);
210 return EFX_DWORD_FIELD(reg, GPIO0_IN);
211}
212
213static struct efx_i2c_bit_operations falcon_i2c_bit_operations = {
214 .setsda = falcon_setsdascl,
215 .setscl = falcon_setsdascl,
216 .getsda = falcon_getsda,
217 .getscl = falcon_getscl,
218 .udelay = 100,
219 .mdelay = 10,
220};
221
222/**************************************************************************
223 *
224 * Falcon special buffer handling
225 * Special buffers are used for event queues and the TX and RX
226 * descriptor rings.
227 *
228 *************************************************************************/
229
230/*
231 * Initialise a Falcon special buffer
232 *
233 * This will define a buffer (previously allocated via
234 * falcon_alloc_special_buffer()) in Falcon's buffer table, allowing
235 * it to be used for event queues, descriptor rings etc.
236 */
237static int
238falcon_init_special_buffer(struct efx_nic *efx,
239 struct efx_special_buffer *buffer)
240{
241 efx_qword_t buf_desc;
242 int index;
243 dma_addr_t dma_addr;
244 int i;
245
246 EFX_BUG_ON_PARANOID(!buffer->addr);
247
248 /* Write buffer descriptors to NIC */
249 for (i = 0; i < buffer->entries; i++) {
250 index = buffer->index + i;
251 dma_addr = buffer->dma_addr + (i * 4096);
252 EFX_LOG(efx, "mapping special buffer %d at %llx\n",
253 index, (unsigned long long)dma_addr);
254 EFX_POPULATE_QWORD_4(buf_desc,
255 IP_DAT_BUF_SIZE, IP_DAT_BUF_SIZE_4K,
256 BUF_ADR_REGION, 0,
257 BUF_ADR_FBUF, (dma_addr >> 12),
258 BUF_OWNER_ID_FBUF, 0);
259 falcon_write_sram(efx, &buf_desc, index);
260 }
261
262 return 0;
263}
264
265/* Unmaps a buffer from Falcon and clears the buffer table entries */
266static void
267falcon_fini_special_buffer(struct efx_nic *efx,
268 struct efx_special_buffer *buffer)
269{
270 efx_oword_t buf_tbl_upd;
271 unsigned int start = buffer->index;
272 unsigned int end = (buffer->index + buffer->entries - 1);
273
274 if (!buffer->entries)
275 return;
276
277 EFX_LOG(efx, "unmapping special buffers %d-%d\n",
278 buffer->index, buffer->index + buffer->entries - 1);
279
280 EFX_POPULATE_OWORD_4(buf_tbl_upd,
281 BUF_UPD_CMD, 0,
282 BUF_CLR_CMD, 1,
283 BUF_CLR_END_ID, end,
284 BUF_CLR_START_ID, start);
285 falcon_write(efx, &buf_tbl_upd, BUF_TBL_UPD_REG_KER);
286}
287
288/*
289 * Allocate a new Falcon special buffer
290 *
291 * This allocates memory for a new buffer, clears it and allocates a
292 * new buffer ID range. It does not write into Falcon's buffer table.
293 *
294 * This call will allocate 4KB buffers, since Falcon can't use 8KB
295 * buffers for event queues and descriptor rings.
296 */
297static int falcon_alloc_special_buffer(struct efx_nic *efx,
298 struct efx_special_buffer *buffer,
299 unsigned int len)
300{
301 struct falcon_nic_data *nic_data = efx->nic_data;
302
303 len = ALIGN(len, FALCON_BUF_SIZE);
304
305 buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
306 &buffer->dma_addr);
307 if (!buffer->addr)
308 return -ENOMEM;
309 buffer->len = len;
310 buffer->entries = len / FALCON_BUF_SIZE;
311 BUG_ON(buffer->dma_addr & (FALCON_BUF_SIZE - 1));
312
313 /* All zeros is a potentially valid event so memset to 0xff */
314 memset(buffer->addr, 0xff, len);
315
316 /* Select new buffer ID */
317 buffer->index = nic_data->next_buffer_table;
318 nic_data->next_buffer_table += buffer->entries;
319
320 EFX_LOG(efx, "allocating special buffers %d-%d at %llx+%x "
321 "(virt %p phys %lx)\n", buffer->index,
322 buffer->index + buffer->entries - 1,
323 (unsigned long long)buffer->dma_addr, len,
324 buffer->addr, virt_to_phys(buffer->addr));
325
326 return 0;
327}
328
329static void falcon_free_special_buffer(struct efx_nic *efx,
330 struct efx_special_buffer *buffer)
331{
332 if (!buffer->addr)
333 return;
334
335 EFX_LOG(efx, "deallocating special buffers %d-%d at %llx+%x "
336 "(virt %p phys %lx)\n", buffer->index,
337 buffer->index + buffer->entries - 1,
338 (unsigned long long)buffer->dma_addr, buffer->len,
339 buffer->addr, virt_to_phys(buffer->addr));
340
341 pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr,
342 buffer->dma_addr);
343 buffer->addr = NULL;
344 buffer->entries = 0;
345}
346
347/**************************************************************************
348 *
349 * Falcon generic buffer handling
350 * These buffers are used for interrupt status and MAC stats
351 *
352 **************************************************************************/
353
354static int falcon_alloc_buffer(struct efx_nic *efx,
355 struct efx_buffer *buffer, unsigned int len)
356{
357 buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
358 &buffer->dma_addr);
359 if (!buffer->addr)
360 return -ENOMEM;
361 buffer->len = len;
362 memset(buffer->addr, 0, len);
363 return 0;
364}
365
366static void falcon_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
367{
368 if (buffer->addr) {
369 pci_free_consistent(efx->pci_dev, buffer->len,
370 buffer->addr, buffer->dma_addr);
371 buffer->addr = NULL;
372 }
373}
374
375/**************************************************************************
376 *
377 * Falcon TX path
378 *
379 **************************************************************************/
380
381/* Returns a pointer to the specified transmit descriptor in the TX
382 * descriptor queue belonging to the specified channel.
383 */
384static inline efx_qword_t *falcon_tx_desc(struct efx_tx_queue *tx_queue,
385 unsigned int index)
386{
387 return (((efx_qword_t *) (tx_queue->txd.addr)) + index);
388}
389
390/* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */
391static inline void falcon_notify_tx_desc(struct efx_tx_queue *tx_queue)
392{
393 unsigned write_ptr;
394 efx_dword_t reg;
395
396 write_ptr = tx_queue->write_count & FALCON_TXD_RING_MASK;
397 EFX_POPULATE_DWORD_1(reg, TX_DESC_WPTR_DWORD, write_ptr);
398 falcon_writel_page(tx_queue->efx, &reg,
399 TX_DESC_UPD_REG_KER_DWORD, tx_queue->queue);
400}
401
402
403/* For each entry inserted into the software descriptor ring, create a
404 * descriptor in the hardware TX descriptor ring (in host memory), and
405 * write a doorbell.
406 */
407void falcon_push_buffers(struct efx_tx_queue *tx_queue)
408{
409
410 struct efx_tx_buffer *buffer;
411 efx_qword_t *txd;
412 unsigned write_ptr;
413
414 BUG_ON(tx_queue->write_count == tx_queue->insert_count);
415
416 do {
417 write_ptr = tx_queue->write_count & FALCON_TXD_RING_MASK;
418 buffer = &tx_queue->buffer[write_ptr];
419 txd = falcon_tx_desc(tx_queue, write_ptr);
420 ++tx_queue->write_count;
421
422 /* Create TX descriptor ring entry */
423 EFX_POPULATE_QWORD_5(*txd,
424 TX_KER_PORT, 0,
425 TX_KER_CONT, buffer->continuation,
426 TX_KER_BYTE_CNT, buffer->len,
427 TX_KER_BUF_REGION, 0,
428 TX_KER_BUF_ADR, buffer->dma_addr);
429 } while (tx_queue->write_count != tx_queue->insert_count);
430
431 wmb(); /* Ensure descriptors are written before they are fetched */
432 falcon_notify_tx_desc(tx_queue);
433}
434
435/* Allocate hardware resources for a TX queue */
436int falcon_probe_tx(struct efx_tx_queue *tx_queue)
437{
438 struct efx_nic *efx = tx_queue->efx;
439 return falcon_alloc_special_buffer(efx, &tx_queue->txd,
440 FALCON_TXD_RING_SIZE *
441 sizeof(efx_qword_t));
442}
443
444int falcon_init_tx(struct efx_tx_queue *tx_queue)
445{
446 efx_oword_t tx_desc_ptr;
447 struct efx_nic *efx = tx_queue->efx;
448 int rc;
449
450 /* Pin TX descriptor ring */
451 rc = falcon_init_special_buffer(efx, &tx_queue->txd);
452 if (rc)
453 return rc;
454
455 /* Push TX descriptor ring to card */
456 EFX_POPULATE_OWORD_10(tx_desc_ptr,
457 TX_DESCQ_EN, 1,
458 TX_ISCSI_DDIG_EN, 0,
459 TX_ISCSI_HDIG_EN, 0,
460 TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index,
461 TX_DESCQ_EVQ_ID, tx_queue->channel->evqnum,
462 TX_DESCQ_OWNER_ID, 0,
463 TX_DESCQ_LABEL, tx_queue->queue,
464 TX_DESCQ_SIZE, FALCON_TXD_RING_ORDER,
465 TX_DESCQ_TYPE, 0,
466 TX_NON_IP_DROP_DIS_B0, 1);
467
468 if (FALCON_REV(efx) >= FALCON_REV_B0) {
469 int csum = !(efx->net_dev->features & NETIF_F_IP_CSUM);
470 EFX_SET_OWORD_FIELD(tx_desc_ptr, TX_IP_CHKSM_DIS_B0, csum);
471 EFX_SET_OWORD_FIELD(tx_desc_ptr, TX_TCP_CHKSM_DIS_B0, csum);
472 }
473
474 falcon_write_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
475 tx_queue->queue);
476
477 if (FALCON_REV(efx) < FALCON_REV_B0) {
478 efx_oword_t reg;
479
480 BUG_ON(tx_queue->queue >= 128); /* HW limit */
481
482 falcon_read(efx, &reg, TX_CHKSM_CFG_REG_KER_A1);
483 if (efx->net_dev->features & NETIF_F_IP_CSUM)
484 clear_bit_le(tx_queue->queue, (void *)&reg);
485 else
486 set_bit_le(tx_queue->queue, (void *)&reg);
487 falcon_write(efx, &reg, TX_CHKSM_CFG_REG_KER_A1);
488 }
489
490 return 0;
491}
492
493static int falcon_flush_tx_queue(struct efx_tx_queue *tx_queue)
494{
495 struct efx_nic *efx = tx_queue->efx;
496 struct efx_channel *channel = &efx->channel[0];
497 efx_oword_t tx_flush_descq;
498 unsigned int read_ptr, i;
499
500 /* Post a flush command */
501 EFX_POPULATE_OWORD_2(tx_flush_descq,
502 TX_FLUSH_DESCQ_CMD, 1,
503 TX_FLUSH_DESCQ, tx_queue->queue);
504 falcon_write(efx, &tx_flush_descq, TX_FLUSH_DESCQ_REG_KER);
505 msleep(FALCON_FLUSH_TIMEOUT);
506
507 if (EFX_WORKAROUND_7803(efx))
508 return 0;
509
510 /* Look for a flush completed event */
511 read_ptr = channel->eventq_read_ptr;
512 for (i = 0; i < FALCON_EVQ_SIZE; ++i) {
513 efx_qword_t *event = falcon_event(channel, read_ptr);
514 int ev_code, ev_sub_code, ev_queue;
515 if (!falcon_event_present(event))
516 break;
517
518 ev_code = EFX_QWORD_FIELD(*event, EV_CODE);
519 ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE);
520 ev_queue = EFX_QWORD_FIELD(*event, DRIVER_EV_TX_DESCQ_ID);
521 if ((ev_sub_code == TX_DESCQ_FLS_DONE_EV_DECODE) &&
522 (ev_queue == tx_queue->queue)) {
523 EFX_LOG(efx, "tx queue %d flush command succesful\n",
524 tx_queue->queue);
525 return 0;
526 }
527
528 read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
529 }
530
531 if (EFX_WORKAROUND_11557(efx)) {
532 efx_oword_t reg;
533 int enabled;
534
535 falcon_read_table(efx, &reg, efx->type->txd_ptr_tbl_base,
536 tx_queue->queue);
537 enabled = EFX_OWORD_FIELD(reg, TX_DESCQ_EN);
538 if (!enabled) {
539 EFX_LOG(efx, "tx queue %d disabled without a "
540 "flush event seen\n", tx_queue->queue);
541 return 0;
542 }
543 }
544
545 EFX_ERR(efx, "tx queue %d flush command timed out\n", tx_queue->queue);
546 return -ETIMEDOUT;
547}
548
549void falcon_fini_tx(struct efx_tx_queue *tx_queue)
550{
551 struct efx_nic *efx = tx_queue->efx;
552 efx_oword_t tx_desc_ptr;
553
554 /* Stop the hardware using the queue */
555 if (falcon_flush_tx_queue(tx_queue))
556 EFX_ERR(efx, "failed to flush tx queue %d\n", tx_queue->queue);
557
558 /* Remove TX descriptor ring from card */
559 EFX_ZERO_OWORD(tx_desc_ptr);
560 falcon_write_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
561 tx_queue->queue);
562
563 /* Unpin TX descriptor ring */
564 falcon_fini_special_buffer(efx, &tx_queue->txd);
565}
566
567/* Free buffers backing TX queue */
568void falcon_remove_tx(struct efx_tx_queue *tx_queue)
569{
570 falcon_free_special_buffer(tx_queue->efx, &tx_queue->txd);
571}
572
573/**************************************************************************
574 *
575 * Falcon RX path
576 *
577 **************************************************************************/
578
579/* Returns a pointer to the specified descriptor in the RX descriptor queue */
580static inline efx_qword_t *falcon_rx_desc(struct efx_rx_queue *rx_queue,
581 unsigned int index)
582{
583 return (((efx_qword_t *) (rx_queue->rxd.addr)) + index);
584}
585
586/* This creates an entry in the RX descriptor queue */
587static inline void falcon_build_rx_desc(struct efx_rx_queue *rx_queue,
588 unsigned index)
589{
590 struct efx_rx_buffer *rx_buf;
591 efx_qword_t *rxd;
592
593 rxd = falcon_rx_desc(rx_queue, index);
594 rx_buf = efx_rx_buffer(rx_queue, index);
595 EFX_POPULATE_QWORD_3(*rxd,
596 RX_KER_BUF_SIZE,
597 rx_buf->len -
598 rx_queue->efx->type->rx_buffer_padding,
599 RX_KER_BUF_REGION, 0,
600 RX_KER_BUF_ADR, rx_buf->dma_addr);
601}
602
603/* This writes to the RX_DESC_WPTR register for the specified receive
604 * descriptor ring.
605 */
606void falcon_notify_rx_desc(struct efx_rx_queue *rx_queue)
607{
608 efx_dword_t reg;
609 unsigned write_ptr;
610
611 while (rx_queue->notified_count != rx_queue->added_count) {
612 falcon_build_rx_desc(rx_queue,
613 rx_queue->notified_count &
614 FALCON_RXD_RING_MASK);
615 ++rx_queue->notified_count;
616 }
617
618 wmb();
619 write_ptr = rx_queue->added_count & FALCON_RXD_RING_MASK;
620 EFX_POPULATE_DWORD_1(reg, RX_DESC_WPTR_DWORD, write_ptr);
621 falcon_writel_page(rx_queue->efx, &reg,
622 RX_DESC_UPD_REG_KER_DWORD, rx_queue->queue);
623}
624
625int falcon_probe_rx(struct efx_rx_queue *rx_queue)
626{
627 struct efx_nic *efx = rx_queue->efx;
628 return falcon_alloc_special_buffer(efx, &rx_queue->rxd,
629 FALCON_RXD_RING_SIZE *
630 sizeof(efx_qword_t));
631}
632
633int falcon_init_rx(struct efx_rx_queue *rx_queue)
634{
635 efx_oword_t rx_desc_ptr;
636 struct efx_nic *efx = rx_queue->efx;
637 int rc;
638 int is_b0 = FALCON_REV(efx) >= FALCON_REV_B0;
639 int iscsi_digest_en = is_b0;
640
641 EFX_LOG(efx, "RX queue %d ring in special buffers %d-%d\n",
642 rx_queue->queue, rx_queue->rxd.index,
643 rx_queue->rxd.index + rx_queue->rxd.entries - 1);
644
645 /* Pin RX descriptor ring */
646 rc = falcon_init_special_buffer(efx, &rx_queue->rxd);
647 if (rc)
648 return rc;
649
650 /* Push RX descriptor ring to card */
651 EFX_POPULATE_OWORD_10(rx_desc_ptr,
652 RX_ISCSI_DDIG_EN, iscsi_digest_en,
653 RX_ISCSI_HDIG_EN, iscsi_digest_en,
654 RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index,
655 RX_DESCQ_EVQ_ID, rx_queue->channel->evqnum,
656 RX_DESCQ_OWNER_ID, 0,
657 RX_DESCQ_LABEL, rx_queue->queue,
658 RX_DESCQ_SIZE, FALCON_RXD_RING_ORDER,
659 RX_DESCQ_TYPE, 0 /* kernel queue */ ,
660 /* For >=B0 this is scatter so disable */
661 RX_DESCQ_JUMBO, !is_b0,
662 RX_DESCQ_EN, 1);
663 falcon_write_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
664 rx_queue->queue);
665 return 0;
666}
667
668static int falcon_flush_rx_queue(struct efx_rx_queue *rx_queue)
669{
670 struct efx_nic *efx = rx_queue->efx;
671 struct efx_channel *channel = &efx->channel[0];
672 unsigned int read_ptr, i;
673 efx_oword_t rx_flush_descq;
674
675 /* Post a flush command */
676 EFX_POPULATE_OWORD_2(rx_flush_descq,
677 RX_FLUSH_DESCQ_CMD, 1,
678 RX_FLUSH_DESCQ, rx_queue->queue);
679 falcon_write(efx, &rx_flush_descq, RX_FLUSH_DESCQ_REG_KER);
680 msleep(FALCON_FLUSH_TIMEOUT);
681
682 if (EFX_WORKAROUND_7803(efx))
683 return 0;
684
685 /* Look for a flush completed event */
686 read_ptr = channel->eventq_read_ptr;
687 for (i = 0; i < FALCON_EVQ_SIZE; ++i) {
688 efx_qword_t *event = falcon_event(channel, read_ptr);
689 int ev_code, ev_sub_code, ev_queue, ev_failed;
690 if (!falcon_event_present(event))
691 break;
692
693 ev_code = EFX_QWORD_FIELD(*event, EV_CODE);
694 ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE);
695 ev_queue = EFX_QWORD_FIELD(*event, DRIVER_EV_RX_DESCQ_ID);
696 ev_failed = EFX_QWORD_FIELD(*event, DRIVER_EV_RX_FLUSH_FAIL);
697
698 if ((ev_sub_code == RX_DESCQ_FLS_DONE_EV_DECODE) &&
699 (ev_queue == rx_queue->queue)) {
700 if (ev_failed) {
701 EFX_INFO(efx, "rx queue %d flush command "
702 "failed\n", rx_queue->queue);
703 return -EAGAIN;
704 } else {
705 EFX_LOG(efx, "rx queue %d flush command "
706 "succesful\n", rx_queue->queue);
707 return 0;
708 }
709 }
710
711 read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
712 }
713
714 if (EFX_WORKAROUND_11557(efx)) {
715 efx_oword_t reg;
716 int enabled;
717
718 falcon_read_table(efx, &reg, efx->type->rxd_ptr_tbl_base,
719 rx_queue->queue);
720 enabled = EFX_OWORD_FIELD(reg, RX_DESCQ_EN);
721 if (!enabled) {
722 EFX_LOG(efx, "rx queue %d disabled without a "
723 "flush event seen\n", rx_queue->queue);
724 return 0;
725 }
726 }
727
728 EFX_ERR(efx, "rx queue %d flush command timed out\n", rx_queue->queue);
729 return -ETIMEDOUT;
730}
731
732void falcon_fini_rx(struct efx_rx_queue *rx_queue)
733{
734 efx_oword_t rx_desc_ptr;
735 struct efx_nic *efx = rx_queue->efx;
736 int i, rc;
737
738 /* Try and flush the rx queue. This may need to be repeated */
739 for (i = 0; i < 5; i++) {
740 rc = falcon_flush_rx_queue(rx_queue);
741 if (rc == -EAGAIN)
742 continue;
743 break;
744 }
745 if (rc)
746 EFX_ERR(efx, "failed to flush rx queue %d\n", rx_queue->queue);
747
748 /* Remove RX descriptor ring from card */
749 EFX_ZERO_OWORD(rx_desc_ptr);
750 falcon_write_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
751 rx_queue->queue);
752
753 /* Unpin RX descriptor ring */
754 falcon_fini_special_buffer(efx, &rx_queue->rxd);
755}
756
757/* Free buffers backing RX queue */
758void falcon_remove_rx(struct efx_rx_queue *rx_queue)
759{
760 falcon_free_special_buffer(rx_queue->efx, &rx_queue->rxd);
761}
762
763/**************************************************************************
764 *
765 * Falcon event queue processing
766 * Event queues are processed by per-channel tasklets.
767 *
768 **************************************************************************/
769
770/* Update a channel's event queue's read pointer (RPTR) register
771 *
772 * This writes the EVQ_RPTR_REG register for the specified channel's
773 * event queue.
774 *
775 * Note that EVQ_RPTR_REG contains the index of the "last read" event,
776 * whereas channel->eventq_read_ptr contains the index of the "next to
777 * read" event.
778 */
779void falcon_eventq_read_ack(struct efx_channel *channel)
780{
781 efx_dword_t reg;
782 struct efx_nic *efx = channel->efx;
783
784 EFX_POPULATE_DWORD_1(reg, EVQ_RPTR_DWORD, channel->eventq_read_ptr);
785 falcon_writel_table(efx, &reg, efx->type->evq_rptr_tbl_base,
786 channel->evqnum);
787}
788
789/* Use HW to insert a SW defined event */
790void falcon_generate_event(struct efx_channel *channel, efx_qword_t *event)
791{
792 efx_oword_t drv_ev_reg;
793
794 EFX_POPULATE_OWORD_2(drv_ev_reg,
795 DRV_EV_QID, channel->evqnum,
796 DRV_EV_DATA,
797 EFX_QWORD_FIELD64(*event, WHOLE_EVENT));
798 falcon_write(channel->efx, &drv_ev_reg, DRV_EV_REG_KER);
799}
800
801/* Handle a transmit completion event
802 *
803 * Falcon batches TX completion events; the message we receive is of
804 * the form "complete all TX events up to this index".
805 */
806static inline void falcon_handle_tx_event(struct efx_channel *channel,
807 efx_qword_t *event)
808{
809 unsigned int tx_ev_desc_ptr;
810 unsigned int tx_ev_q_label;
811 struct efx_tx_queue *tx_queue;
812 struct efx_nic *efx = channel->efx;
813
814 if (likely(EFX_QWORD_FIELD(*event, TX_EV_COMP))) {
815 /* Transmit completion */
816 tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, TX_EV_DESC_PTR);
817 tx_ev_q_label = EFX_QWORD_FIELD(*event, TX_EV_Q_LABEL);
818 tx_queue = &efx->tx_queue[tx_ev_q_label];
819 efx_xmit_done(tx_queue, tx_ev_desc_ptr);
820 } else if (EFX_QWORD_FIELD(*event, TX_EV_WQ_FF_FULL)) {
821 /* Rewrite the FIFO write pointer */
822 tx_ev_q_label = EFX_QWORD_FIELD(*event, TX_EV_Q_LABEL);
823 tx_queue = &efx->tx_queue[tx_ev_q_label];
824
825 if (NET_DEV_REGISTERED(efx))
826 netif_tx_lock(efx->net_dev);
827 falcon_notify_tx_desc(tx_queue);
828 if (NET_DEV_REGISTERED(efx))
829 netif_tx_unlock(efx->net_dev);
830 } else if (EFX_QWORD_FIELD(*event, TX_EV_PKT_ERR) &&
831 EFX_WORKAROUND_10727(efx)) {
832 efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
833 } else {
834 EFX_ERR(efx, "channel %d unexpected TX event "
835 EFX_QWORD_FMT"\n", channel->channel,
836 EFX_QWORD_VAL(*event));
837 }
838}
839
840/* Check received packet's destination MAC address. */
841static int check_dest_mac(struct efx_rx_queue *rx_queue,
842 const efx_qword_t *event)
843{
844 struct efx_rx_buffer *rx_buf;
845 struct efx_nic *efx = rx_queue->efx;
846 int rx_ev_desc_ptr;
847 struct ethhdr *eh;
848
849 if (efx->promiscuous)
850 return 1;
851
852 rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR);
853 rx_buf = efx_rx_buffer(rx_queue, rx_ev_desc_ptr);
854 eh = (struct ethhdr *)rx_buf->data;
855 if (memcmp(eh->h_dest, efx->net_dev->dev_addr, ETH_ALEN))
856 return 0;
857 return 1;
858}
859
860/* Detect errors included in the rx_evt_pkt_ok bit. */
861static void falcon_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
862 const efx_qword_t *event,
863 unsigned *rx_ev_pkt_ok,
864 int *discard, int byte_count)
865{
866 struct efx_nic *efx = rx_queue->efx;
867 unsigned rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err;
868 unsigned rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
869 unsigned rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc;
870 unsigned rx_ev_pkt_type, rx_ev_other_err, rx_ev_pause_frm;
871 unsigned rx_ev_ip_frag_err, rx_ev_hdr_type, rx_ev_mcast_pkt;
872 int snap, non_ip;
873
874 rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE);
875 rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, RX_EV_MCAST_PKT);
876 rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, RX_EV_TOBE_DISC);
877 rx_ev_pkt_type = EFX_QWORD_FIELD(*event, RX_EV_PKT_TYPE);
878 rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event,
879 RX_EV_BUF_OWNER_ID_ERR);
880 rx_ev_ip_frag_err = EFX_QWORD_FIELD(*event, RX_EV_IF_FRAG_ERR);
881 rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event,
882 RX_EV_IP_HDR_CHKSUM_ERR);
883 rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event,
884 RX_EV_TCP_UDP_CHKSUM_ERR);
885 rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, RX_EV_ETH_CRC_ERR);
886 rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, RX_EV_FRM_TRUNC);
887 rx_ev_drib_nib = ((FALCON_REV(efx) >= FALCON_REV_B0) ?
888 0 : EFX_QWORD_FIELD(*event, RX_EV_DRIB_NIB));
889 rx_ev_pause_frm = EFX_QWORD_FIELD(*event, RX_EV_PAUSE_FRM_ERR);
890
891 /* Every error apart from tobe_disc and pause_frm */
892 rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err |
893 rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
894 rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);
895
896 snap = (rx_ev_pkt_type == RX_EV_PKT_TYPE_LLC_DECODE) ||
897 (rx_ev_pkt_type == RX_EV_PKT_TYPE_VLAN_LLC_DECODE);
898 non_ip = (rx_ev_hdr_type == RX_EV_HDR_TYPE_NON_IP_DECODE);
899
900 /* SFC bug 5475/8970: The Falcon XMAC incorrectly calculates the
901 * length field of an LLC frame, which sets TOBE_DISC. We could set
902 * PASS_LEN_ERR, but we want the MAC to filter out short frames (to
903 * protect the RX block).
904 *
905 * bug5475 - LLC/SNAP: Falcon identifies SNAP packets.
906 * bug8970 - LLC/noSNAP: Falcon does not provide an LLC flag.
907 * LLC can't encapsulate IP, so by definition
908 * these packets are NON_IP.
909 *
910 * Unicast mismatch will also cause TOBE_DISC, so the driver needs
911 * to check this.
912 */
913 if (EFX_WORKAROUND_5475(efx) && rx_ev_tobe_disc && (snap || non_ip)) {
914 /* If all the other flags are zero then we can state the
915 * entire packet is ok, which will flag to the kernel not
916 * to recalculate checksums.
917 */
918 if (!(non_ip | rx_ev_other_err | rx_ev_pause_frm))
919 *rx_ev_pkt_ok = 1;
920
921 rx_ev_tobe_disc = 0;
922
923 /* TOBE_DISC is set for unicast mismatch. But given that
924 * we can't trust TOBE_DISC here, we must validate the dest
925 * MAC address ourselves.
926 */
927 if (!rx_ev_mcast_pkt && !check_dest_mac(rx_queue, event))
928 rx_ev_tobe_disc = 1;
929 }
930
931 /* Count errors that are not in MAC stats. */
932 if (rx_ev_frm_trunc)
933 ++rx_queue->channel->n_rx_frm_trunc;
934 else if (rx_ev_tobe_disc)
935 ++rx_queue->channel->n_rx_tobe_disc;
936 else if (rx_ev_ip_hdr_chksum_err)
937 ++rx_queue->channel->n_rx_ip_hdr_chksum_err;
938 else if (rx_ev_tcp_udp_chksum_err)
939 ++rx_queue->channel->n_rx_tcp_udp_chksum_err;
940 if (rx_ev_ip_frag_err)
941 ++rx_queue->channel->n_rx_ip_frag_err;
942
943 /* The frame must be discarded if any of these are true. */
944 *discard = (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib |
945 rx_ev_tobe_disc | rx_ev_pause_frm);
946
947 /* TOBE_DISC is expected on unicast mismatches; don't print out an
948 * error message. FRM_TRUNC indicates RXDP dropped the packet due
949 * to a FIFO overflow.
950 */
951#ifdef EFX_ENABLE_DEBUG
952 if (rx_ev_other_err) {
953 EFX_INFO_RL(efx, " RX queue %d unexpected RX event "
954 EFX_QWORD_FMT "%s%s%s%s%s%s%s%s%s\n",
955 rx_queue->queue, EFX_QWORD_VAL(*event),
956 rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "",
957 rx_ev_ip_hdr_chksum_err ?
958 " [IP_HDR_CHKSUM_ERR]" : "",
959 rx_ev_tcp_udp_chksum_err ?
960 " [TCP_UDP_CHKSUM_ERR]" : "",
961 rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "",
962 rx_ev_frm_trunc ? " [FRM_TRUNC]" : "",
963 rx_ev_drib_nib ? " [DRIB_NIB]" : "",
964 rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
965 rx_ev_pause_frm ? " [PAUSE]" : "",
966 snap ? " [SNAP/LLC]" : "");
967 }
968#endif
969
970 if (unlikely(rx_ev_eth_crc_err && EFX_WORKAROUND_10750(efx) &&
971 efx->phy_type == PHY_TYPE_10XPRESS))
972 tenxpress_crc_err(efx);
973}
974
975/* Handle receive events that are not in-order. */
976static void falcon_handle_rx_bad_index(struct efx_rx_queue *rx_queue,
977 unsigned index)
978{
979 struct efx_nic *efx = rx_queue->efx;
980 unsigned expected, dropped;
981
982 expected = rx_queue->removed_count & FALCON_RXD_RING_MASK;
983 dropped = ((index + FALCON_RXD_RING_SIZE - expected) &
984 FALCON_RXD_RING_MASK);
985 EFX_INFO(efx, "dropped %d events (index=%d expected=%d)\n",
986 dropped, index, expected);
987
988 efx_schedule_reset(efx, EFX_WORKAROUND_5676(efx) ?
989 RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
990}
991
992/* Handle a packet received event
993 *
994 * Falcon silicon gives a "discard" flag if it's a unicast packet with the
995 * wrong destination address
996 * Also "is multicast" and "matches multicast filter" flags can be used to
997 * discard non-matching multicast packets.
998 */
999static inline int falcon_handle_rx_event(struct efx_channel *channel,
1000 const efx_qword_t *event)
1001{
1002 unsigned int rx_ev_q_label, rx_ev_desc_ptr, rx_ev_byte_cnt;
1003 unsigned int rx_ev_pkt_ok, rx_ev_hdr_type, rx_ev_mcast_pkt;
1004 unsigned expected_ptr;
1005 int discard = 0, checksummed;
1006 struct efx_rx_queue *rx_queue;
1007 struct efx_nic *efx = channel->efx;
1008
1009 /* Basic packet information */
1010 rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, RX_EV_BYTE_CNT);
1011 rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, RX_EV_PKT_OK);
1012 rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE);
1013 WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_JUMBO_CONT));
1014 WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_SOP) != 1);
1015
1016 rx_ev_q_label = EFX_QWORD_FIELD(*event, RX_EV_Q_LABEL);
1017 rx_queue = &efx->rx_queue[rx_ev_q_label];
1018
1019 rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR);
1020 expected_ptr = rx_queue->removed_count & FALCON_RXD_RING_MASK;
1021 if (unlikely(rx_ev_desc_ptr != expected_ptr)) {
1022 falcon_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);
1023 return rx_ev_q_label;
1024 }
1025
1026 if (likely(rx_ev_pkt_ok)) {
1027 /* If packet is marked as OK and packet type is TCP/IPv4 or
1028 * UDP/IPv4, then we can rely on the hardware checksum.
1029 */
1030 checksummed = RX_EV_HDR_TYPE_HAS_CHECKSUMS(rx_ev_hdr_type);
1031 } else {
1032 falcon_handle_rx_not_ok(rx_queue, event, &rx_ev_pkt_ok,
1033 &discard, rx_ev_byte_cnt);
1034 checksummed = 0;
1035 }
1036
1037 /* Detect multicast packets that didn't match the filter */
1038 rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, RX_EV_MCAST_PKT);
1039 if (rx_ev_mcast_pkt) {
1040 unsigned int rx_ev_mcast_hash_match =
1041 EFX_QWORD_FIELD(*event, RX_EV_MCAST_HASH_MATCH);
1042
1043 if (unlikely(!rx_ev_mcast_hash_match))
1044 discard = 1;
1045 }
1046
1047 /* Handle received packet */
1048 efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt,
1049 checksummed, discard);
1050
1051 return rx_ev_q_label;
1052}
1053
1054/* Global events are basically PHY events */
1055static void falcon_handle_global_event(struct efx_channel *channel,
1056 efx_qword_t *event)
1057{
1058 struct efx_nic *efx = channel->efx;
1059 int is_phy_event = 0, handled = 0;
1060
1061 /* Check for interrupt on either port. Some boards have a
1062 * single PHY wired to the interrupt line for port 1. */
1063 if (EFX_QWORD_FIELD(*event, G_PHY0_INTR) ||
1064 EFX_QWORD_FIELD(*event, G_PHY1_INTR) ||
1065 EFX_QWORD_FIELD(*event, XG_PHY_INTR))
1066 is_phy_event = 1;
1067
1068 if ((FALCON_REV(efx) >= FALCON_REV_B0) &&
1069 EFX_OWORD_FIELD(*event, XG_MNT_INTR_B0))
1070 is_phy_event = 1;
1071
1072 if (is_phy_event) {
1073 efx->phy_op->clear_interrupt(efx);
1074 queue_work(efx->workqueue, &efx->reconfigure_work);
1075 handled = 1;
1076 }
1077
1078 if (EFX_QWORD_FIELD_VER(efx, *event, RX_RECOVERY)) {
1079 EFX_ERR(efx, "channel %d seen global RX_RESET "
1080 "event. Resetting.\n", channel->channel);
1081
1082 atomic_inc(&efx->rx_reset);
1083 efx_schedule_reset(efx, EFX_WORKAROUND_6555(efx) ?
1084 RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
1085 handled = 1;
1086 }
1087
1088 if (!handled)
1089 EFX_ERR(efx, "channel %d unknown global event "
1090 EFX_QWORD_FMT "\n", channel->channel,
1091 EFX_QWORD_VAL(*event));
1092}
1093
1094static void falcon_handle_driver_event(struct efx_channel *channel,
1095 efx_qword_t *event)
1096{
1097 struct efx_nic *efx = channel->efx;
1098 unsigned int ev_sub_code;
1099 unsigned int ev_sub_data;
1100
1101 ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE);
1102 ev_sub_data = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_DATA);
1103
1104 switch (ev_sub_code) {
1105 case TX_DESCQ_FLS_DONE_EV_DECODE:
1106 EFX_TRACE(efx, "channel %d TXQ %d flushed\n",
1107 channel->channel, ev_sub_data);
1108 break;
1109 case RX_DESCQ_FLS_DONE_EV_DECODE:
1110 EFX_TRACE(efx, "channel %d RXQ %d flushed\n",
1111 channel->channel, ev_sub_data);
1112 break;
1113 case EVQ_INIT_DONE_EV_DECODE:
1114 EFX_LOG(efx, "channel %d EVQ %d initialised\n",
1115 channel->channel, ev_sub_data);
1116 break;
1117 case SRM_UPD_DONE_EV_DECODE:
1118 EFX_TRACE(efx, "channel %d SRAM update done\n",
1119 channel->channel);
1120 break;
1121 case WAKE_UP_EV_DECODE:
1122 EFX_TRACE(efx, "channel %d RXQ %d wakeup event\n",
1123 channel->channel, ev_sub_data);
1124 break;
1125 case TIMER_EV_DECODE:
1126 EFX_TRACE(efx, "channel %d RX queue %d timer expired\n",
1127 channel->channel, ev_sub_data);
1128 break;
1129 case RX_RECOVERY_EV_DECODE:
1130 EFX_ERR(efx, "channel %d seen DRIVER RX_RESET event. "
1131 "Resetting.\n", channel->channel);
1132 efx_schedule_reset(efx,
1133 EFX_WORKAROUND_6555(efx) ?
1134 RESET_TYPE_RX_RECOVERY :
1135 RESET_TYPE_DISABLE);
1136 break;
1137 case RX_DSC_ERROR_EV_DECODE:
1138 EFX_ERR(efx, "RX DMA Q %d reports descriptor fetch error."
1139 " RX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
1140 efx_schedule_reset(efx, RESET_TYPE_RX_DESC_FETCH);
1141 break;
1142 case TX_DSC_ERROR_EV_DECODE:
1143 EFX_ERR(efx, "TX DMA Q %d reports descriptor fetch error."
1144 " TX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
1145 efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
1146 break;
1147 default:
1148 EFX_TRACE(efx, "channel %d unknown driver event code %d "
1149 "data %04x\n", channel->channel, ev_sub_code,
1150 ev_sub_data);
1151 break;
1152 }
1153}
1154
1155int falcon_process_eventq(struct efx_channel *channel, int *rx_quota)
1156{
1157 unsigned int read_ptr;
1158 efx_qword_t event, *p_event;
1159 int ev_code;
1160 int rxq;
1161 int rxdmaqs = 0;
1162
1163 read_ptr = channel->eventq_read_ptr;
1164
1165 do {
1166 p_event = falcon_event(channel, read_ptr);
1167 event = *p_event;
1168
1169 if (!falcon_event_present(&event))
1170 /* End of events */
1171 break;
1172
1173 EFX_TRACE(channel->efx, "channel %d event is "EFX_QWORD_FMT"\n",
1174 channel->channel, EFX_QWORD_VAL(event));
1175
1176 /* Clear this event by marking it all ones */
1177 EFX_SET_QWORD(*p_event);
1178
1179 ev_code = EFX_QWORD_FIELD(event, EV_CODE);
1180
1181 switch (ev_code) {
1182 case RX_IP_EV_DECODE:
1183 rxq = falcon_handle_rx_event(channel, &event);
1184 rxdmaqs |= (1 << rxq);
1185 (*rx_quota)--;
1186 break;
1187 case TX_IP_EV_DECODE:
1188 falcon_handle_tx_event(channel, &event);
1189 break;
1190 case DRV_GEN_EV_DECODE:
1191 channel->eventq_magic
1192 = EFX_QWORD_FIELD(event, EVQ_MAGIC);
1193 EFX_LOG(channel->efx, "channel %d received generated "
1194 "event "EFX_QWORD_FMT"\n", channel->channel,
1195 EFX_QWORD_VAL(event));
1196 break;
1197 case GLOBAL_EV_DECODE:
1198 falcon_handle_global_event(channel, &event);
1199 break;
1200 case DRIVER_EV_DECODE:
1201 falcon_handle_driver_event(channel, &event);
1202 break;
1203 default:
1204 EFX_ERR(channel->efx, "channel %d unknown event type %d"
1205 " (data " EFX_QWORD_FMT ")\n", channel->channel,
1206 ev_code, EFX_QWORD_VAL(event));
1207 }
1208
1209 /* Increment read pointer */
1210 read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK;
1211
1212 } while (*rx_quota);
1213
1214 channel->eventq_read_ptr = read_ptr;
1215 return rxdmaqs;
1216}
1217
1218void falcon_set_int_moderation(struct efx_channel *channel)
1219{
1220 efx_dword_t timer_cmd;
1221 struct efx_nic *efx = channel->efx;
1222
1223 /* Set timer register */
1224 if (channel->irq_moderation) {
1225 /* Round to resolution supported by hardware. The value we
1226 * program is based at 0. So actual interrupt moderation
1227 * achieved is ((x + 1) * res).
1228 */
1229 unsigned int res = 5;
1230 channel->irq_moderation -= (channel->irq_moderation % res);
1231 if (channel->irq_moderation < res)
1232 channel->irq_moderation = res;
1233 EFX_POPULATE_DWORD_2(timer_cmd,
1234 TIMER_MODE, TIMER_MODE_INT_HLDOFF,
1235 TIMER_VAL,
1236 (channel->irq_moderation / res) - 1);
1237 } else {
1238 EFX_POPULATE_DWORD_2(timer_cmd,
1239 TIMER_MODE, TIMER_MODE_DIS,
1240 TIMER_VAL, 0);
1241 }
1242 falcon_writel_page_locked(efx, &timer_cmd, TIMER_CMD_REG_KER,
1243 channel->evqnum);
1244
1245}
1246
1247/* Allocate buffer table entries for event queue */
1248int falcon_probe_eventq(struct efx_channel *channel)
1249{
1250 struct efx_nic *efx = channel->efx;
1251 unsigned int evq_size;
1252
1253 evq_size = FALCON_EVQ_SIZE * sizeof(efx_qword_t);
1254 return falcon_alloc_special_buffer(efx, &channel->eventq, evq_size);
1255}
1256
1257int falcon_init_eventq(struct efx_channel *channel)
1258{
1259 efx_oword_t evq_ptr;
1260 struct efx_nic *efx = channel->efx;
1261 int rc;
1262
1263 EFX_LOG(efx, "channel %d event queue in special buffers %d-%d\n",
1264 channel->channel, channel->eventq.index,
1265 channel->eventq.index + channel->eventq.entries - 1);
1266
1267 /* Pin event queue buffer */
1268 rc = falcon_init_special_buffer(efx, &channel->eventq);
1269 if (rc)
1270 return rc;
1271
1272 /* Fill event queue with all ones (i.e. empty events) */
1273 memset(channel->eventq.addr, 0xff, channel->eventq.len);
1274
1275 /* Push event queue to card */
1276 EFX_POPULATE_OWORD_3(evq_ptr,
1277 EVQ_EN, 1,
1278 EVQ_SIZE, FALCON_EVQ_ORDER,
1279 EVQ_BUF_BASE_ID, channel->eventq.index);
1280 falcon_write_table(efx, &evq_ptr, efx->type->evq_ptr_tbl_base,
1281 channel->evqnum);
1282
1283 falcon_set_int_moderation(channel);
1284
1285 return 0;
1286}
1287
1288void falcon_fini_eventq(struct efx_channel *channel)
1289{
1290 efx_oword_t eventq_ptr;
1291 struct efx_nic *efx = channel->efx;
1292
1293 /* Remove event queue from card */
1294 EFX_ZERO_OWORD(eventq_ptr);
1295 falcon_write_table(efx, &eventq_ptr, efx->type->evq_ptr_tbl_base,
1296 channel->evqnum);
1297
1298 /* Unpin event queue */
1299 falcon_fini_special_buffer(efx, &channel->eventq);
1300}
1301
1302/* Free buffers backing event queue */
1303void falcon_remove_eventq(struct efx_channel *channel)
1304{
1305 falcon_free_special_buffer(channel->efx, &channel->eventq);
1306}
1307
1308
1309/* Generates a test event on the event queue. A subsequent call to
1310 * process_eventq() should pick up the event and place the value of
1311 * "magic" into channel->eventq_magic;
1312 */
1313void falcon_generate_test_event(struct efx_channel *channel, unsigned int magic)
1314{
1315 efx_qword_t test_event;
1316
1317 EFX_POPULATE_QWORD_2(test_event,
1318 EV_CODE, DRV_GEN_EV_DECODE,
1319 EVQ_MAGIC, magic);
1320 falcon_generate_event(channel, &test_event);
1321}
1322
1323
1324/**************************************************************************
1325 *
1326 * Falcon hardware interrupts
1327 * The hardware interrupt handler does very little work; all the event
1328 * queue processing is carried out by per-channel tasklets.
1329 *
1330 **************************************************************************/
1331
1332/* Enable/disable/generate Falcon interrupts */
1333static inline void falcon_interrupts(struct efx_nic *efx, int enabled,
1334 int force)
1335{
1336 efx_oword_t int_en_reg_ker;
1337
1338 EFX_POPULATE_OWORD_2(int_en_reg_ker,
1339 KER_INT_KER, force,
1340 DRV_INT_EN_KER, enabled);
1341 falcon_write(efx, &int_en_reg_ker, INT_EN_REG_KER);
1342}
1343
1344void falcon_enable_interrupts(struct efx_nic *efx)
1345{
1346 efx_oword_t int_adr_reg_ker;
1347 struct efx_channel *channel;
1348
1349 EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr));
1350 wmb(); /* Ensure interrupt vector is clear before interrupts enabled */
1351
1352 /* Program address */
1353 EFX_POPULATE_OWORD_2(int_adr_reg_ker,
1354 NORM_INT_VEC_DIS_KER, EFX_INT_MODE_USE_MSI(efx),
1355 INT_ADR_KER, efx->irq_status.dma_addr);
1356 falcon_write(efx, &int_adr_reg_ker, INT_ADR_REG_KER);
1357
1358 /* Enable interrupts */
1359 falcon_interrupts(efx, 1, 0);
1360
1361 /* Force processing of all the channels to get the EVQ RPTRs up to
1362 date */
1363 efx_for_each_channel_with_interrupt(channel, efx)
1364 efx_schedule_channel(channel);
1365}
1366
1367void falcon_disable_interrupts(struct efx_nic *efx)
1368{
1369 /* Disable interrupts */
1370 falcon_interrupts(efx, 0, 0);
1371}
1372
1373/* Generate a Falcon test interrupt
1374 * Interrupt must already have been enabled, otherwise nasty things
1375 * may happen.
1376 */
1377void falcon_generate_interrupt(struct efx_nic *efx)
1378{
1379 falcon_interrupts(efx, 1, 1);
1380}
1381
1382/* Acknowledge a legacy interrupt from Falcon
1383 *
1384 * This acknowledges a legacy (not MSI) interrupt via INT_ACK_KER_REG.
1385 *
1386 * Due to SFC bug 3706 (silicon revision <=A1) reads can be duplicated in the
1387 * BIU. Interrupt acknowledge is read sensitive so must write instead
1388 * (then read to ensure the BIU collector is flushed)
1389 *
1390 * NB most hardware supports MSI interrupts
1391 */
1392static inline void falcon_irq_ack_a1(struct efx_nic *efx)
1393{
1394 efx_dword_t reg;
1395
1396 EFX_POPULATE_DWORD_1(reg, INT_ACK_DUMMY_DATA, 0xb7eb7e);
1397 falcon_writel(efx, &reg, INT_ACK_REG_KER_A1);
1398 falcon_readl(efx, &reg, WORK_AROUND_BROKEN_PCI_READS_REG_KER_A1);
1399}
1400
1401/* Process a fatal interrupt
1402 * Disable bus mastering ASAP and schedule a reset
1403 */
1404static irqreturn_t falcon_fatal_interrupt(struct efx_nic *efx)
1405{
1406 struct falcon_nic_data *nic_data = efx->nic_data;
1407 efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
1408 efx_oword_t fatal_intr;
1409 int error, mem_perr;
1410 static int n_int_errors;
1411
1412 falcon_read(efx, &fatal_intr, FATAL_INTR_REG_KER);
1413 error = EFX_OWORD_FIELD(fatal_intr, INT_KER_ERROR);
1414
1415 EFX_ERR(efx, "SYSTEM ERROR " EFX_OWORD_FMT " status "
1416 EFX_OWORD_FMT ": %s\n", EFX_OWORD_VAL(*int_ker),
1417 EFX_OWORD_VAL(fatal_intr),
1418 error ? "disabling bus mastering" : "no recognised error");
1419 if (error == 0)
1420 goto out;
1421
1422 /* If this is a memory parity error dump which blocks are offending */
1423 mem_perr = EFX_OWORD_FIELD(fatal_intr, MEM_PERR_INT_KER);
1424 if (mem_perr) {
1425 efx_oword_t reg;
1426 falcon_read(efx, &reg, MEM_STAT_REG_KER);
1427 EFX_ERR(efx, "SYSTEM ERROR: memory parity error "
1428 EFX_OWORD_FMT "\n", EFX_OWORD_VAL(reg));
1429 }
1430
1431 /* Disable DMA bus mastering on both devices */
1432 pci_disable_device(efx->pci_dev);
1433 if (FALCON_IS_DUAL_FUNC(efx))
1434 pci_disable_device(nic_data->pci_dev2);
1435
1436 if (++n_int_errors < FALCON_MAX_INT_ERRORS) {
1437 EFX_ERR(efx, "SYSTEM ERROR - reset scheduled\n");
1438 efx_schedule_reset(efx, RESET_TYPE_INT_ERROR);
1439 } else {
1440 EFX_ERR(efx, "SYSTEM ERROR - max number of errors seen."
1441 "NIC will be disabled\n");
1442 efx_schedule_reset(efx, RESET_TYPE_DISABLE);
1443 }
1444out:
1445 return IRQ_HANDLED;
1446}
1447
1448/* Handle a legacy interrupt from Falcon
1449 * Acknowledges the interrupt and schedule event queue processing.
1450 */
1451static irqreturn_t falcon_legacy_interrupt_b0(int irq, void *dev_id)
1452{
1453 struct efx_nic *efx = (struct efx_nic *)dev_id;
1454 efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
1455 struct efx_channel *channel;
1456 efx_dword_t reg;
1457 u32 queues;
1458 int syserr;
1459
1460 /* Read the ISR which also ACKs the interrupts */
1461 falcon_readl(efx, &reg, INT_ISR0_B0);
1462 queues = EFX_EXTRACT_DWORD(reg, 0, 31);
1463
1464 /* Check to see if we have a serious error condition */
1465 syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT);
1466 if (unlikely(syserr))
1467 return falcon_fatal_interrupt(efx);
1468
1469 if (queues == 0)
1470 return IRQ_NONE;
1471
1472 efx->last_irq_cpu = raw_smp_processor_id();
1473 EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
1474 irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
1475
1476 /* Schedule processing of any interrupting queues */
1477 channel = &efx->channel[0];
1478 while (queues) {
1479 if (queues & 0x01)
1480 efx_schedule_channel(channel);
1481 channel++;
1482 queues >>= 1;
1483 }
1484
1485 return IRQ_HANDLED;
1486}
1487
1488
1489static irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
1490{
1491 struct efx_nic *efx = (struct efx_nic *)dev_id;
1492 efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
1493 struct efx_channel *channel;
1494 int syserr;
1495 int queues;
1496
1497 /* Check to see if this is our interrupt. If it isn't, we
1498 * exit without having touched the hardware.
1499 */
1500 if (unlikely(EFX_OWORD_IS_ZERO(*int_ker))) {
1501 EFX_TRACE(efx, "IRQ %d on CPU %d not for me\n", irq,
1502 raw_smp_processor_id());
1503 return IRQ_NONE;
1504 }
1505 efx->last_irq_cpu = raw_smp_processor_id();
1506 EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
1507 irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
1508
1509 /* Check to see if we have a serious error condition */
1510 syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT);
1511 if (unlikely(syserr))
1512 return falcon_fatal_interrupt(efx);
1513
1514 /* Determine interrupting queues, clear interrupt status
1515 * register and acknowledge the device interrupt.
1516 */
1517 BUILD_BUG_ON(INT_EVQS_WIDTH > EFX_MAX_CHANNELS);
1518 queues = EFX_OWORD_FIELD(*int_ker, INT_EVQS);
1519 EFX_ZERO_OWORD(*int_ker);
1520 wmb(); /* Ensure the vector is cleared before interrupt ack */
1521 falcon_irq_ack_a1(efx);
1522
1523 /* Schedule processing of any interrupting queues */
1524 channel = &efx->channel[0];
1525 while (queues) {
1526 if (queues & 0x01)
1527 efx_schedule_channel(channel);
1528 channel++;
1529 queues >>= 1;
1530 }
1531
1532 return IRQ_HANDLED;
1533}
1534
1535/* Handle an MSI interrupt from Falcon
1536 *
1537 * Handle an MSI hardware interrupt. This routine schedules event
1538 * queue processing. No interrupt acknowledgement cycle is necessary.
1539 * Also, we never need to check that the interrupt is for us, since
1540 * MSI interrupts cannot be shared.
1541 */
1542static irqreturn_t falcon_msi_interrupt(int irq, void *dev_id)
1543{
1544 struct efx_channel *channel = (struct efx_channel *)dev_id;
1545 struct efx_nic *efx = channel->efx;
1546 efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr;
1547 int syserr;
1548
1549 efx->last_irq_cpu = raw_smp_processor_id();
1550 EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
1551 irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
1552
1553 /* Check to see if we have a serious error condition */
1554 syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT);
1555 if (unlikely(syserr))
1556 return falcon_fatal_interrupt(efx);
1557
1558 /* Schedule processing of the channel */
1559 efx_schedule_channel(channel);
1560
1561 return IRQ_HANDLED;
1562}
1563
1564
1565/* Setup RSS indirection table.
1566 * This maps from the hash value of the packet to RXQ
1567 */
1568static void falcon_setup_rss_indir_table(struct efx_nic *efx)
1569{
1570 int i = 0;
1571 unsigned long offset;
1572 efx_dword_t dword;
1573
1574 if (FALCON_REV(efx) < FALCON_REV_B0)
1575 return;
1576
1577 for (offset = RX_RSS_INDIR_TBL_B0;
1578 offset < RX_RSS_INDIR_TBL_B0 + 0x800;
1579 offset += 0x10) {
1580 EFX_POPULATE_DWORD_1(dword, RX_RSS_INDIR_ENT_B0,
1581 i % efx->rss_queues);
1582 falcon_writel(efx, &dword, offset);
1583 i++;
1584 }
1585}
1586
1587/* Hook interrupt handler(s)
1588 * Try MSI and then legacy interrupts.
1589 */
1590int falcon_init_interrupt(struct efx_nic *efx)
1591{
1592 struct efx_channel *channel;
1593 int rc;
1594
1595 if (!EFX_INT_MODE_USE_MSI(efx)) {
1596 irq_handler_t handler;
1597 if (FALCON_REV(efx) >= FALCON_REV_B0)
1598 handler = falcon_legacy_interrupt_b0;
1599 else
1600 handler = falcon_legacy_interrupt_a1;
1601
1602 rc = request_irq(efx->legacy_irq, handler, IRQF_SHARED,
1603 efx->name, efx);
1604 if (rc) {
1605 EFX_ERR(efx, "failed to hook legacy IRQ %d\n",
1606 efx->pci_dev->irq);
1607 goto fail1;
1608 }
1609 return 0;
1610 }
1611
1612 /* Hook MSI or MSI-X interrupt */
1613 efx_for_each_channel_with_interrupt(channel, efx) {
1614 rc = request_irq(channel->irq, falcon_msi_interrupt,
1615 IRQF_PROBE_SHARED, /* Not shared */
1616 efx->name, channel);
1617 if (rc) {
1618 EFX_ERR(efx, "failed to hook IRQ %d\n", channel->irq);
1619 goto fail2;
1620 }
1621 }
1622
1623 return 0;
1624
1625 fail2:
1626 efx_for_each_channel_with_interrupt(channel, efx)
1627 free_irq(channel->irq, channel);
1628 fail1:
1629 return rc;
1630}
1631
1632void falcon_fini_interrupt(struct efx_nic *efx)
1633{
1634 struct efx_channel *channel;
1635 efx_oword_t reg;
1636
1637 /* Disable MSI/MSI-X interrupts */
1638 efx_for_each_channel_with_interrupt(channel, efx)
1639 if (channel->irq)
1640 free_irq(channel->irq, channel);
1641
1642 /* ACK legacy interrupt */
1643 if (FALCON_REV(efx) >= FALCON_REV_B0)
1644 falcon_read(efx, &reg, INT_ISR0_B0);
1645 else
1646 falcon_irq_ack_a1(efx);
1647
1648 /* Disable legacy interrupt */
1649 if (efx->legacy_irq)
1650 free_irq(efx->legacy_irq, efx);
1651}
1652
1653/**************************************************************************
1654 *
1655 * EEPROM/flash
1656 *
1657 **************************************************************************
1658 */
1659
1660#define FALCON_SPI_MAX_LEN sizeof(efx_oword_t)
1661
1662/* Wait for SPI command completion */
1663static int falcon_spi_wait(struct efx_nic *efx)
1664{
1665 efx_oword_t reg;
1666 int cmd_en, timer_active;
1667 int count;
1668
1669 count = 0;
1670 do {
1671 falcon_read(efx, &reg, EE_SPI_HCMD_REG_KER);
1672 cmd_en = EFX_OWORD_FIELD(reg, EE_SPI_HCMD_CMD_EN);
1673 timer_active = EFX_OWORD_FIELD(reg, EE_WR_TIMER_ACTIVE);
1674 if (!cmd_en && !timer_active)
1675 return 0;
1676 udelay(10);
1677 } while (++count < 10000); /* wait upto 100msec */
1678 EFX_ERR(efx, "timed out waiting for SPI\n");
1679 return -ETIMEDOUT;
1680}
1681
1682static int
1683falcon_spi_read(struct efx_nic *efx, int device_id, unsigned int command,
1684 unsigned int address, unsigned int addr_len,
1685 void *data, unsigned int len)
1686{
1687 efx_oword_t reg;
1688 int rc;
1689
1690 BUG_ON(len > FALCON_SPI_MAX_LEN);
1691
1692 /* Check SPI not currently being accessed */
1693 rc = falcon_spi_wait(efx);
1694 if (rc)
1695 return rc;
1696
1697 /* Program address register */
1698 EFX_POPULATE_OWORD_1(reg, EE_SPI_HADR_ADR, address);
1699 falcon_write(efx, &reg, EE_SPI_HADR_REG_KER);
1700
1701 /* Issue read command */
1702 EFX_POPULATE_OWORD_7(reg,
1703 EE_SPI_HCMD_CMD_EN, 1,
1704 EE_SPI_HCMD_SF_SEL, device_id,
1705 EE_SPI_HCMD_DABCNT, len,
1706 EE_SPI_HCMD_READ, EE_SPI_READ,
1707 EE_SPI_HCMD_DUBCNT, 0,
1708 EE_SPI_HCMD_ADBCNT, addr_len,
1709 EE_SPI_HCMD_ENC, command);
1710 falcon_write(efx, &reg, EE_SPI_HCMD_REG_KER);
1711
1712 /* Wait for read to complete */
1713 rc = falcon_spi_wait(efx);
1714 if (rc)
1715 return rc;
1716
1717 /* Read data */
1718 falcon_read(efx, &reg, EE_SPI_HDATA_REG_KER);
1719 memcpy(data, &reg, len);
1720 return 0;
1721}
1722
1723/**************************************************************************
1724 *
1725 * MAC wrapper
1726 *
1727 **************************************************************************
1728 */
1729void falcon_drain_tx_fifo(struct efx_nic *efx)
1730{
1731 efx_oword_t temp;
1732 int count;
1733
1734 if (FALCON_REV(efx) < FALCON_REV_B0)
1735 return;
1736
1737 falcon_read(efx, &temp, MAC0_CTRL_REG_KER);
1738 /* There is no point in draining more than once */
1739 if (EFX_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0))
1740 return;
1741
1742 /* MAC stats will fail whilst the TX fifo is draining. Serialise
1743 * the drain sequence with the statistics fetch */
1744 spin_lock(&efx->stats_lock);
1745
1746 EFX_SET_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0, 1);
1747 falcon_write(efx, &temp, MAC0_CTRL_REG_KER);
1748
1749 /* Reset the MAC and EM block. */
1750 falcon_read(efx, &temp, GLB_CTL_REG_KER);
1751 EFX_SET_OWORD_FIELD(temp, RST_XGTX, 1);
1752 EFX_SET_OWORD_FIELD(temp, RST_XGRX, 1);
1753 EFX_SET_OWORD_FIELD(temp, RST_EM, 1);
1754 falcon_write(efx, &temp, GLB_CTL_REG_KER);
1755
1756 count = 0;
1757 while (1) {
1758 falcon_read(efx, &temp, GLB_CTL_REG_KER);
1759 if (!EFX_OWORD_FIELD(temp, RST_XGTX) &&
1760 !EFX_OWORD_FIELD(temp, RST_XGRX) &&
1761 !EFX_OWORD_FIELD(temp, RST_EM)) {
1762 EFX_LOG(efx, "Completed MAC reset after %d loops\n",
1763 count);
1764 break;
1765 }
1766 if (count > 20) {
1767 EFX_ERR(efx, "MAC reset failed\n");
1768 break;
1769 }
1770 count++;
1771 udelay(10);
1772 }
1773
1774 spin_unlock(&efx->stats_lock);
1775
1776 /* If we've reset the EM block and the link is up, then
1777 * we'll have to kick the XAUI link so the PHY can recover */
1778 if (efx->link_up && EFX_WORKAROUND_5147(efx))
1779 falcon_reset_xaui(efx);
1780}
1781
1782void falcon_deconfigure_mac_wrapper(struct efx_nic *efx)
1783{
1784 efx_oword_t temp;
1785
1786 if (FALCON_REV(efx) < FALCON_REV_B0)
1787 return;
1788
1789 /* Isolate the MAC -> RX */
1790 falcon_read(efx, &temp, RX_CFG_REG_KER);
1791 EFX_SET_OWORD_FIELD(temp, RX_INGR_EN_B0, 0);
1792 falcon_write(efx, &temp, RX_CFG_REG_KER);
1793
1794 if (!efx->link_up)
1795 falcon_drain_tx_fifo(efx);
1796}
1797
1798void falcon_reconfigure_mac_wrapper(struct efx_nic *efx)
1799{
1800 efx_oword_t reg;
1801 int link_speed;
1802 unsigned int tx_fc;
1803
1804 if (efx->link_options & GM_LPA_10000)
1805 link_speed = 0x3;
1806 else if (efx->link_options & GM_LPA_1000)
1807 link_speed = 0x2;
1808 else if (efx->link_options & GM_LPA_100)
1809 link_speed = 0x1;
1810 else
1811 link_speed = 0x0;
1812 /* MAC_LINK_STATUS controls MAC backpressure but doesn't work
1813 * as advertised. Disable to ensure packets are not
1814 * indefinitely held and TX queue can be flushed at any point
1815 * while the link is down. */
1816 EFX_POPULATE_OWORD_5(reg,
1817 MAC_XOFF_VAL, 0xffff /* max pause time */,
1818 MAC_BCAD_ACPT, 1,
1819 MAC_UC_PROM, efx->promiscuous,
1820 MAC_LINK_STATUS, 1, /* always set */
1821 MAC_SPEED, link_speed);
1822 /* On B0, MAC backpressure can be disabled and packets get
1823 * discarded. */
1824 if (FALCON_REV(efx) >= FALCON_REV_B0) {
1825 EFX_SET_OWORD_FIELD(reg, TXFIFO_DRAIN_EN_B0,
1826 !efx->link_up);
1827 }
1828
1829 falcon_write(efx, &reg, MAC0_CTRL_REG_KER);
1830
1831 /* Restore the multicast hash registers. */
1832 falcon_set_multicast_hash(efx);
1833
1834 /* Transmission of pause frames when RX crosses the threshold is
1835 * covered by RX_XOFF_MAC_EN and XM_TX_CFG_REG:XM_FCNTL.
1836 * Action on receipt of pause frames is controller by XM_DIS_FCNTL */
1837 tx_fc = (efx->flow_control & EFX_FC_TX) ? 1 : 0;
1838 falcon_read(efx, &reg, RX_CFG_REG_KER);
1839 EFX_SET_OWORD_FIELD_VER(efx, reg, RX_XOFF_MAC_EN, tx_fc);
1840
1841 /* Unisolate the MAC -> RX */
1842 if (FALCON_REV(efx) >= FALCON_REV_B0)
1843 EFX_SET_OWORD_FIELD(reg, RX_INGR_EN_B0, 1);
1844 falcon_write(efx, &reg, RX_CFG_REG_KER);
1845}
1846
1847int falcon_dma_stats(struct efx_nic *efx, unsigned int done_offset)
1848{
1849 efx_oword_t reg;
1850 u32 *dma_done;
1851 int i;
1852
1853 if (disable_dma_stats)
1854 return 0;
1855
1856 /* Statistics fetch will fail if the MAC is in TX drain */
1857 if (FALCON_REV(efx) >= FALCON_REV_B0) {
1858 efx_oword_t temp;
1859 falcon_read(efx, &temp, MAC0_CTRL_REG_KER);
1860 if (EFX_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0))
1861 return 0;
1862 }
1863
1864 dma_done = (efx->stats_buffer.addr + done_offset);
1865 *dma_done = FALCON_STATS_NOT_DONE;
1866 wmb(); /* ensure done flag is clear */
1867
1868 /* Initiate DMA transfer of stats */
1869 EFX_POPULATE_OWORD_2(reg,
1870 MAC_STAT_DMA_CMD, 1,
1871 MAC_STAT_DMA_ADR,
1872 efx->stats_buffer.dma_addr);
1873 falcon_write(efx, &reg, MAC0_STAT_DMA_REG_KER);
1874
1875 /* Wait for transfer to complete */
1876 for (i = 0; i < 400; i++) {
1877 if (*(volatile u32 *)dma_done == FALCON_STATS_DONE)
1878 return 0;
1879 udelay(10);
1880 }
1881
1882 EFX_ERR(efx, "timed out waiting for statistics\n");
1883 return -ETIMEDOUT;
1884}
1885
1886/**************************************************************************
1887 *
1888 * PHY access via GMII
1889 *
1890 **************************************************************************
1891 */
1892
1893/* Use the top bit of the MII PHY id to indicate the PHY type
1894 * (1G/10G), with the remaining bits as the actual PHY id.
1895 *
1896 * This allows us to avoid leaking information from the mii_if_info
1897 * structure into other data structures.
1898 */
1899#define FALCON_PHY_ID_ID_WIDTH EFX_WIDTH(MD_PRT_DEV_ADR)
1900#define FALCON_PHY_ID_ID_MASK ((1 << FALCON_PHY_ID_ID_WIDTH) - 1)
1901#define FALCON_PHY_ID_WIDTH (FALCON_PHY_ID_ID_WIDTH + 1)
1902#define FALCON_PHY_ID_MASK ((1 << FALCON_PHY_ID_WIDTH) - 1)
1903#define FALCON_PHY_ID_10G (1 << (FALCON_PHY_ID_WIDTH - 1))
1904
1905
1906/* Packing the clause 45 port and device fields into a single value */
1907#define MD_PRT_ADR_COMP_LBN (MD_PRT_ADR_LBN - MD_DEV_ADR_LBN)
1908#define MD_PRT_ADR_COMP_WIDTH MD_PRT_ADR_WIDTH
1909#define MD_DEV_ADR_COMP_LBN 0
1910#define MD_DEV_ADR_COMP_WIDTH MD_DEV_ADR_WIDTH
1911
1912
1913/* Wait for GMII access to complete */
1914static int falcon_gmii_wait(struct efx_nic *efx)
1915{
1916 efx_dword_t md_stat;
1917 int count;
1918
1919 for (count = 0; count < 1000; count++) { /* wait upto 10ms */
1920 falcon_readl(efx, &md_stat, MD_STAT_REG_KER);
1921 if (EFX_DWORD_FIELD(md_stat, MD_BSY) == 0) {
1922 if (EFX_DWORD_FIELD(md_stat, MD_LNFL) != 0 ||
1923 EFX_DWORD_FIELD(md_stat, MD_BSERR) != 0) {
1924 EFX_ERR(efx, "error from GMII access "
1925 EFX_DWORD_FMT"\n",
1926 EFX_DWORD_VAL(md_stat));
1927 return -EIO;
1928 }
1929 return 0;
1930 }
1931 udelay(10);
1932 }
1933 EFX_ERR(efx, "timed out waiting for GMII\n");
1934 return -ETIMEDOUT;
1935}
1936
1937/* Writes a GMII register of a PHY connected to Falcon using MDIO. */
1938static void falcon_mdio_write(struct net_device *net_dev, int phy_id,
1939 int addr, int value)
1940{
1941 struct efx_nic *efx = (struct efx_nic *)net_dev->priv;
1942 unsigned int phy_id2 = phy_id & FALCON_PHY_ID_ID_MASK;
1943 efx_oword_t reg;
1944
1945 /* The 'generic' prt/dev packing in mdio_10g.h is conveniently
1946 * chosen so that the only current user, Falcon, can take the
1947 * packed value and use them directly.
1948 * Fail to build if this assumption is broken.
1949 */
1950 BUILD_BUG_ON(FALCON_PHY_ID_10G != MDIO45_XPRT_ID_IS10G);
1951 BUILD_BUG_ON(FALCON_PHY_ID_ID_WIDTH != MDIO45_PRT_DEV_WIDTH);
1952 BUILD_BUG_ON(MD_PRT_ADR_COMP_LBN != MDIO45_PRT_ID_COMP_LBN);
1953 BUILD_BUG_ON(MD_DEV_ADR_COMP_LBN != MDIO45_DEV_ID_COMP_LBN);
1954
1955 if (phy_id2 == PHY_ADDR_INVALID)
1956 return;
1957
1958 /* See falcon_mdio_read for an explanation. */
1959 if (!(phy_id & FALCON_PHY_ID_10G)) {
1960 int mmd = ffs(efx->phy_op->mmds) - 1;
1961 EFX_TRACE(efx, "Fixing erroneous clause22 write\n");
1962 phy_id2 = mdio_clause45_pack(phy_id2, mmd)
1963 & FALCON_PHY_ID_ID_MASK;
1964 }
1965
1966 EFX_REGDUMP(efx, "writing GMII %d register %02x with %04x\n", phy_id,
1967 addr, value);
1968
1969 spin_lock_bh(&efx->phy_lock);
1970
1971 /* Check MII not currently being accessed */
1972 if (falcon_gmii_wait(efx) != 0)
1973 goto out;
1974
1975 /* Write the address/ID register */
1976 EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr);
1977 falcon_write(efx, &reg, MD_PHY_ADR_REG_KER);
1978
1979 EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_id2);
1980 falcon_write(efx, &reg, MD_ID_REG_KER);
1981
1982 /* Write data */
1983 EFX_POPULATE_OWORD_1(reg, MD_TXD, value);
1984 falcon_write(efx, &reg, MD_TXD_REG_KER);
1985
1986 EFX_POPULATE_OWORD_2(reg,
1987 MD_WRC, 1,
1988 MD_GC, 0);
1989 falcon_write(efx, &reg, MD_CS_REG_KER);
1990
1991 /* Wait for data to be written */
1992 if (falcon_gmii_wait(efx) != 0) {
1993 /* Abort the write operation */
1994 EFX_POPULATE_OWORD_2(reg,
1995 MD_WRC, 0,
1996 MD_GC, 1);
1997 falcon_write(efx, &reg, MD_CS_REG_KER);
1998 udelay(10);
1999 }
2000
2001 out:
2002 spin_unlock_bh(&efx->phy_lock);
2003}
2004
2005/* Reads a GMII register from a PHY connected to Falcon. If no value
2006 * could be read, -1 will be returned. */
2007static int falcon_mdio_read(struct net_device *net_dev, int phy_id, int addr)
2008{
2009 struct efx_nic *efx = (struct efx_nic *)net_dev->priv;
2010 unsigned int phy_addr = phy_id & FALCON_PHY_ID_ID_MASK;
2011 efx_oword_t reg;
2012 int value = -1;
2013
2014 if (phy_addr == PHY_ADDR_INVALID)
2015 return -1;
2016
2017 /* Our PHY code knows whether it needs to talk clause 22(1G) or 45(10G)
2018 * but the generic Linux code does not make any distinction or have
2019 * any state for this.
2020 * We spot the case where someone tried to talk 22 to a 45 PHY and
2021 * redirect the request to the lowest numbered MMD as a clause45
2022 * request. This is enough to allow simple queries like id and link
2023 * state to succeed. TODO: We may need to do more in future.
2024 */
2025 if (!(phy_id & FALCON_PHY_ID_10G)) {
2026 int mmd = ffs(efx->phy_op->mmds) - 1;
2027 EFX_TRACE(efx, "Fixing erroneous clause22 read\n");
2028 phy_addr = mdio_clause45_pack(phy_addr, mmd)
2029 & FALCON_PHY_ID_ID_MASK;
2030 }
2031
2032 spin_lock_bh(&efx->phy_lock);
2033
2034 /* Check MII not currently being accessed */
2035 if (falcon_gmii_wait(efx) != 0)
2036 goto out;
2037
2038 EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr);
2039 falcon_write(efx, &reg, MD_PHY_ADR_REG_KER);
2040
2041 EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_addr);
2042 falcon_write(efx, &reg, MD_ID_REG_KER);
2043
2044 /* Request data to be read */
2045 EFX_POPULATE_OWORD_2(reg, MD_RDC, 1, MD_GC, 0);
2046 falcon_write(efx, &reg, MD_CS_REG_KER);
2047
2048 /* Wait for data to become available */
2049 value = falcon_gmii_wait(efx);
2050 if (value == 0) {
2051 falcon_read(efx, &reg, MD_RXD_REG_KER);
2052 value = EFX_OWORD_FIELD(reg, MD_RXD);
2053 EFX_REGDUMP(efx, "read from GMII %d register %02x, got %04x\n",
2054 phy_id, addr, value);
2055 } else {
2056 /* Abort the read operation */
2057 EFX_POPULATE_OWORD_2(reg,
2058 MD_RIC, 0,
2059 MD_GC, 1);
2060 falcon_write(efx, &reg, MD_CS_REG_KER);
2061
2062 EFX_LOG(efx, "read from GMII 0x%x register %02x, got "
2063 "error %d\n", phy_id, addr, value);
2064 }
2065
2066 out:
2067 spin_unlock_bh(&efx->phy_lock);
2068
2069 return value;
2070}
2071
2072static void falcon_init_mdio(struct mii_if_info *gmii)
2073{
2074 gmii->mdio_read = falcon_mdio_read;
2075 gmii->mdio_write = falcon_mdio_write;
2076 gmii->phy_id_mask = FALCON_PHY_ID_MASK;
2077 gmii->reg_num_mask = ((1 << EFX_WIDTH(MD_PHY_ADR)) - 1);
2078}
2079
2080static int falcon_probe_phy(struct efx_nic *efx)
2081{
2082 switch (efx->phy_type) {
2083 case PHY_TYPE_10XPRESS:
2084 efx->phy_op = &falcon_tenxpress_phy_ops;
2085 break;
2086 case PHY_TYPE_XFP:
2087 efx->phy_op = &falcon_xfp_phy_ops;
2088 break;
2089 default:
2090 EFX_ERR(efx, "Unknown PHY type %d\n",
2091 efx->phy_type);
2092 return -1;
2093 }
2094 return 0;
2095}
2096
2097/* This call is responsible for hooking in the MAC and PHY operations */
2098int falcon_probe_port(struct efx_nic *efx)
2099{
2100 int rc;
2101
2102 /* Hook in PHY operations table */
2103 rc = falcon_probe_phy(efx);
2104 if (rc)
2105 return rc;
2106
2107 /* Set up GMII structure for PHY */
2108 efx->mii.supports_gmii = 1;
2109 falcon_init_mdio(&efx->mii);
2110
2111 /* Hardware flow ctrl. FalconA RX FIFO too small for pause generation */
2112 if (FALCON_REV(efx) >= FALCON_REV_B0)
2113 efx->flow_control = EFX_FC_RX | EFX_FC_TX;
2114 else
2115 efx->flow_control = EFX_FC_RX;
2116
2117 /* Allocate buffer for stats */
2118 rc = falcon_alloc_buffer(efx, &efx->stats_buffer,
2119 FALCON_MAC_STATS_SIZE);
2120 if (rc)
2121 return rc;
2122 EFX_LOG(efx, "stats buffer at %llx (virt %p phys %lx)\n",
2123 (unsigned long long)efx->stats_buffer.dma_addr,
2124 efx->stats_buffer.addr,
2125 virt_to_phys(efx->stats_buffer.addr));
2126
2127 return 0;
2128}
2129
2130void falcon_remove_port(struct efx_nic *efx)
2131{
2132 falcon_free_buffer(efx, &efx->stats_buffer);
2133}
2134
2135/**************************************************************************
2136 *
2137 * Multicast filtering
2138 *
2139 **************************************************************************
2140 */
2141
2142void falcon_set_multicast_hash(struct efx_nic *efx)
2143{
2144 union efx_multicast_hash *mc_hash = &efx->multicast_hash;
2145
2146 /* Broadcast packets go through the multicast hash filter.
2147 * ether_crc_le() of the broadcast address is 0xbe2612ff
2148 * so we always add bit 0xff to the mask.
2149 */
2150 set_bit_le(0xff, mc_hash->byte);
2151
2152 falcon_write(efx, &mc_hash->oword[0], MAC_MCAST_HASH_REG0_KER);
2153 falcon_write(efx, &mc_hash->oword[1], MAC_MCAST_HASH_REG1_KER);
2154}
2155
2156/**************************************************************************
2157 *
2158 * Device reset
2159 *
2160 **************************************************************************
2161 */
2162
2163/* Resets NIC to known state. This routine must be called in process
2164 * context and is allowed to sleep. */
2165int falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
2166{
2167 struct falcon_nic_data *nic_data = efx->nic_data;
2168 efx_oword_t glb_ctl_reg_ker;
2169 int rc;
2170
2171 EFX_LOG(efx, "performing hardware reset (%d)\n", method);
2172
2173 /* Initiate device reset */
2174 if (method == RESET_TYPE_WORLD) {
2175 rc = pci_save_state(efx->pci_dev);
2176 if (rc) {
2177 EFX_ERR(efx, "failed to backup PCI state of primary "
2178 "function prior to hardware reset\n");
2179 goto fail1;
2180 }
2181 if (FALCON_IS_DUAL_FUNC(efx)) {
2182 rc = pci_save_state(nic_data->pci_dev2);
2183 if (rc) {
2184 EFX_ERR(efx, "failed to backup PCI state of "
2185 "secondary function prior to "
2186 "hardware reset\n");
2187 goto fail2;
2188 }
2189 }
2190
2191 EFX_POPULATE_OWORD_2(glb_ctl_reg_ker,
2192 EXT_PHY_RST_DUR, 0x7,
2193 SWRST, 1);
2194 } else {
2195 int reset_phy = (method == RESET_TYPE_INVISIBLE ?
2196 EXCLUDE_FROM_RESET : 0);
2197
2198 EFX_POPULATE_OWORD_7(glb_ctl_reg_ker,
2199 EXT_PHY_RST_CTL, reset_phy,
2200 PCIE_CORE_RST_CTL, EXCLUDE_FROM_RESET,
2201 PCIE_NSTCK_RST_CTL, EXCLUDE_FROM_RESET,
2202 PCIE_SD_RST_CTL, EXCLUDE_FROM_RESET,
2203 EE_RST_CTL, EXCLUDE_FROM_RESET,
2204 EXT_PHY_RST_DUR, 0x7 /* 10ms */,
2205 SWRST, 1);
2206 }
2207 falcon_write(efx, &glb_ctl_reg_ker, GLB_CTL_REG_KER);
2208
2209 EFX_LOG(efx, "waiting for hardware reset\n");
2210 schedule_timeout_uninterruptible(HZ / 20);
2211
2212 /* Restore PCI configuration if needed */
2213 if (method == RESET_TYPE_WORLD) {
2214 if (FALCON_IS_DUAL_FUNC(efx)) {
2215 rc = pci_restore_state(nic_data->pci_dev2);
2216 if (rc) {
2217 EFX_ERR(efx, "failed to restore PCI config for "
2218 "the secondary function\n");
2219 goto fail3;
2220 }
2221 }
2222 rc = pci_restore_state(efx->pci_dev);
2223 if (rc) {
2224 EFX_ERR(efx, "failed to restore PCI config for the "
2225 "primary function\n");
2226 goto fail4;
2227 }
2228 EFX_LOG(efx, "successfully restored PCI config\n");
2229 }
2230
2231 /* Assert that reset complete */
2232 falcon_read(efx, &glb_ctl_reg_ker, GLB_CTL_REG_KER);
2233 if (EFX_OWORD_FIELD(glb_ctl_reg_ker, SWRST) != 0) {
2234 rc = -ETIMEDOUT;
2235 EFX_ERR(efx, "timed out waiting for hardware reset\n");
2236 goto fail5;
2237 }
2238 EFX_LOG(efx, "hardware reset complete\n");
2239
2240 return 0;
2241
2242 /* pci_save_state() and pci_restore_state() MUST be called in pairs */
2243fail2:
2244fail3:
2245 pci_restore_state(efx->pci_dev);
2246fail1:
2247fail4:
2248fail5:
2249 return rc;
2250}
2251
2252/* Zeroes out the SRAM contents. This routine must be called in
2253 * process context and is allowed to sleep.
2254 */
2255static int falcon_reset_sram(struct efx_nic *efx)
2256{
2257 efx_oword_t srm_cfg_reg_ker, gpio_cfg_reg_ker;
2258 int count;
2259
2260 /* Set the SRAM wake/sleep GPIO appropriately. */
2261 falcon_read(efx, &gpio_cfg_reg_ker, GPIO_CTL_REG_KER);
2262 EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, GPIO1_OEN, 1);
2263 EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, GPIO1_OUT, 1);
2264 falcon_write(efx, &gpio_cfg_reg_ker, GPIO_CTL_REG_KER);
2265
2266 /* Initiate SRAM reset */
2267 EFX_POPULATE_OWORD_2(srm_cfg_reg_ker,
2268 SRAM_OOB_BT_INIT_EN, 1,
2269 SRM_NUM_BANKS_AND_BANK_SIZE, 0);
2270 falcon_write(efx, &srm_cfg_reg_ker, SRM_CFG_REG_KER);
2271
2272 /* Wait for SRAM reset to complete */
2273 count = 0;
2274 do {
2275 EFX_LOG(efx, "waiting for SRAM reset (attempt %d)...\n", count);
2276
2277 /* SRAM reset is slow; expect around 16ms */
2278 schedule_timeout_uninterruptible(HZ / 50);
2279
2280 /* Check for reset complete */
2281 falcon_read(efx, &srm_cfg_reg_ker, SRM_CFG_REG_KER);
2282 if (!EFX_OWORD_FIELD(srm_cfg_reg_ker, SRAM_OOB_BT_INIT_EN)) {
2283 EFX_LOG(efx, "SRAM reset complete\n");
2284
2285 return 0;
2286 }
2287 } while (++count < 20); /* wait upto 0.4 sec */
2288
2289 EFX_ERR(efx, "timed out waiting for SRAM reset\n");
2290 return -ETIMEDOUT;
2291}
2292
2293/* Extract non-volatile configuration */
2294static int falcon_probe_nvconfig(struct efx_nic *efx)
2295{
2296 struct falcon_nvconfig *nvconfig;
2297 efx_oword_t nic_stat;
2298 int device_id;
2299 unsigned addr_len;
2300 size_t offset, len;
2301 int magic_num, struct_ver, board_rev;
2302 int rc;
2303
2304 /* Find the boot device. */
2305 falcon_read(efx, &nic_stat, NIC_STAT_REG);
2306 if (EFX_OWORD_FIELD(nic_stat, SF_PRST)) {
2307 device_id = EE_SPI_FLASH;
2308 addr_len = 3;
2309 } else if (EFX_OWORD_FIELD(nic_stat, EE_PRST)) {
2310 device_id = EE_SPI_EEPROM;
2311 addr_len = 2;
2312 } else {
2313 return -ENODEV;
2314 }
2315
2316 nvconfig = kmalloc(sizeof(*nvconfig), GFP_KERNEL);
2317
2318 /* Read the whole configuration structure into memory. */
2319 for (offset = 0; offset < sizeof(*nvconfig); offset += len) {
2320 len = min(sizeof(*nvconfig) - offset,
2321 (size_t) FALCON_SPI_MAX_LEN);
2322 rc = falcon_spi_read(efx, device_id, SPI_READ,
2323 NVCONFIG_BASE + offset, addr_len,
2324 (char *)nvconfig + offset, len);
2325 if (rc)
2326 goto out;
2327 }
2328
2329 /* Read the MAC addresses */
2330 memcpy(efx->mac_address, nvconfig->mac_address[0], ETH_ALEN);
2331
2332 /* Read the board configuration. */
2333 magic_num = le16_to_cpu(nvconfig->board_magic_num);
2334 struct_ver = le16_to_cpu(nvconfig->board_struct_ver);
2335
2336 if (magic_num != NVCONFIG_BOARD_MAGIC_NUM || struct_ver < 2) {
2337 EFX_ERR(efx, "Non volatile memory bad magic=%x ver=%x "
2338 "therefore using defaults\n", magic_num, struct_ver);
2339 efx->phy_type = PHY_TYPE_NONE;
2340 efx->mii.phy_id = PHY_ADDR_INVALID;
2341 board_rev = 0;
2342 } else {
2343 struct falcon_nvconfig_board_v2 *v2 = &nvconfig->board_v2;
2344
2345 efx->phy_type = v2->port0_phy_type;
2346 efx->mii.phy_id = v2->port0_phy_addr;
2347 board_rev = le16_to_cpu(v2->board_revision);
2348 }
2349
2350 EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mii.phy_id);
2351
2352 efx_set_board_info(efx, board_rev);
2353
2354 out:
2355 kfree(nvconfig);
2356 return rc;
2357}
2358
2359/* Probe the NIC variant (revision, ASIC vs FPGA, function count, port
2360 * count, port speed). Set workaround and feature flags accordingly.
2361 */
2362static int falcon_probe_nic_variant(struct efx_nic *efx)
2363{
2364 efx_oword_t altera_build;
2365
2366 falcon_read(efx, &altera_build, ALTERA_BUILD_REG_KER);
2367 if (EFX_OWORD_FIELD(altera_build, VER_ALL)) {
2368 EFX_ERR(efx, "Falcon FPGA not supported\n");
2369 return -ENODEV;
2370 }
2371
2372 switch (FALCON_REV(efx)) {
2373 case FALCON_REV_A0:
2374 case 0xff:
2375 EFX_ERR(efx, "Falcon rev A0 not supported\n");
2376 return -ENODEV;
2377
2378 case FALCON_REV_A1:{
2379 efx_oword_t nic_stat;
2380
2381 falcon_read(efx, &nic_stat, NIC_STAT_REG);
2382
2383 if (EFX_OWORD_FIELD(nic_stat, STRAP_PCIE) == 0) {
2384 EFX_ERR(efx, "Falcon rev A1 PCI-X not supported\n");
2385 return -ENODEV;
2386 }
2387 if (!EFX_OWORD_FIELD(nic_stat, STRAP_10G)) {
2388 EFX_ERR(efx, "1G mode not supported\n");
2389 return -ENODEV;
2390 }
2391 break;
2392 }
2393
2394 case FALCON_REV_B0:
2395 break;
2396
2397 default:
2398 EFX_ERR(efx, "Unknown Falcon rev %d\n", FALCON_REV(efx));
2399 return -ENODEV;
2400 }
2401
2402 return 0;
2403}
2404
2405int falcon_probe_nic(struct efx_nic *efx)
2406{
2407 struct falcon_nic_data *nic_data;
2408 int rc;
2409
2410 /* Initialise I2C interface state */
2411 efx->i2c.efx = efx;
2412 efx->i2c.op = &falcon_i2c_bit_operations;
2413 efx->i2c.sda = 1;
2414 efx->i2c.scl = 1;
2415
2416 /* Allocate storage for hardware specific data */
2417 nic_data = kzalloc(sizeof(*nic_data), GFP_KERNEL);
2418 efx->nic_data = (void *) nic_data;
2419
2420 /* Determine number of ports etc. */
2421 rc = falcon_probe_nic_variant(efx);
2422 if (rc)
2423 goto fail1;
2424
2425 /* Probe secondary function if expected */
2426 if (FALCON_IS_DUAL_FUNC(efx)) {
2427 struct pci_dev *dev = pci_dev_get(efx->pci_dev);
2428
2429 while ((dev = pci_get_device(EFX_VENDID_SFC, FALCON_A_S_DEVID,
2430 dev))) {
2431 if (dev->bus == efx->pci_dev->bus &&
2432 dev->devfn == efx->pci_dev->devfn + 1) {
2433 nic_data->pci_dev2 = dev;
2434 break;
2435 }
2436 }
2437 if (!nic_data->pci_dev2) {
2438 EFX_ERR(efx, "failed to find secondary function\n");
2439 rc = -ENODEV;
2440 goto fail2;
2441 }
2442 }
2443
2444 /* Now we can reset the NIC */
2445 rc = falcon_reset_hw(efx, RESET_TYPE_ALL);
2446 if (rc) {
2447 EFX_ERR(efx, "failed to reset NIC\n");
2448 goto fail3;
2449 }
2450
2451 /* Allocate memory for INT_KER */
2452 rc = falcon_alloc_buffer(efx, &efx->irq_status, sizeof(efx_oword_t));
2453 if (rc)
2454 goto fail4;
2455 BUG_ON(efx->irq_status.dma_addr & 0x0f);
2456
2457 EFX_LOG(efx, "INT_KER at %llx (virt %p phys %lx)\n",
2458 (unsigned long long)efx->irq_status.dma_addr,
2459 efx->irq_status.addr, virt_to_phys(efx->irq_status.addr));
2460
2461 /* Read in the non-volatile configuration */
2462 rc = falcon_probe_nvconfig(efx);
2463 if (rc)
2464 goto fail5;
2465
2466 return 0;
2467
2468 fail5:
2469 falcon_free_buffer(efx, &efx->irq_status);
2470 fail4:
2471 /* fall-thru */
2472 fail3:
2473 if (nic_data->pci_dev2) {
2474 pci_dev_put(nic_data->pci_dev2);
2475 nic_data->pci_dev2 = NULL;
2476 }
2477 fail2:
2478 /* fall-thru */
2479 fail1:
2480 kfree(efx->nic_data);
2481 return rc;
2482}
2483
2484/* This call performs hardware-specific global initialisation, such as
2485 * defining the descriptor cache sizes and number of RSS channels.
2486 * It does not set up any buffers, descriptor rings or event queues.
2487 */
2488int falcon_init_nic(struct efx_nic *efx)
2489{
2490 struct falcon_nic_data *data;
2491 efx_oword_t temp;
2492 unsigned thresh;
2493 int rc;
2494
2495 data = (struct falcon_nic_data *)efx->nic_data;
2496
2497 /* Set up the address region register. This is only needed
2498 * for the B0 FPGA, but since we are just pushing in the
2499 * reset defaults this may as well be unconditional. */
2500 EFX_POPULATE_OWORD_4(temp, ADR_REGION0, 0,
2501 ADR_REGION1, (1 << 16),
2502 ADR_REGION2, (2 << 16),
2503 ADR_REGION3, (3 << 16));
2504 falcon_write(efx, &temp, ADR_REGION_REG_KER);
2505
2506 /* Use on-chip SRAM */
2507 falcon_read(efx, &temp, NIC_STAT_REG);
2508 EFX_SET_OWORD_FIELD(temp, ONCHIP_SRAM, 1);
2509 falcon_write(efx, &temp, NIC_STAT_REG);
2510
2511 /* Set buffer table mode */
2512 EFX_POPULATE_OWORD_1(temp, BUF_TBL_MODE, BUF_TBL_MODE_FULL);
2513 falcon_write(efx, &temp, BUF_TBL_CFG_REG_KER);
2514
2515 rc = falcon_reset_sram(efx);
2516 if (rc)
2517 return rc;
2518
2519 /* Set positions of descriptor caches in SRAM. */
2520 EFX_POPULATE_OWORD_1(temp, SRM_TX_DC_BASE_ADR, TX_DC_BASE / 8);
2521 falcon_write(efx, &temp, SRM_TX_DC_CFG_REG_KER);
2522 EFX_POPULATE_OWORD_1(temp, SRM_RX_DC_BASE_ADR, RX_DC_BASE / 8);
2523 falcon_write(efx, &temp, SRM_RX_DC_CFG_REG_KER);
2524
2525 /* Set TX descriptor cache size. */
2526 BUILD_BUG_ON(TX_DC_ENTRIES != (16 << TX_DC_ENTRIES_ORDER));
2527 EFX_POPULATE_OWORD_1(temp, TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
2528 falcon_write(efx, &temp, TX_DC_CFG_REG_KER);
2529
2530 /* Set RX descriptor cache size. Set low watermark to size-8, as
2531 * this allows most efficient prefetching.
2532 */
2533 BUILD_BUG_ON(RX_DC_ENTRIES != (16 << RX_DC_ENTRIES_ORDER));
2534 EFX_POPULATE_OWORD_1(temp, RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
2535 falcon_write(efx, &temp, RX_DC_CFG_REG_KER);
2536 EFX_POPULATE_OWORD_1(temp, RX_DC_PF_LWM, RX_DC_ENTRIES - 8);
2537 falcon_write(efx, &temp, RX_DC_PF_WM_REG_KER);
2538
2539 /* Clear the parity enables on the TX data fifos as
2540 * they produce false parity errors because of timing issues
2541 */
2542 if (EFX_WORKAROUND_5129(efx)) {
2543 falcon_read(efx, &temp, SPARE_REG_KER);
2544 EFX_SET_OWORD_FIELD(temp, MEM_PERR_EN_TX_DATA, 0);
2545 falcon_write(efx, &temp, SPARE_REG_KER);
2546 }
2547
2548 /* Enable all the genuinely fatal interrupts. (They are still
2549 * masked by the overall interrupt mask, controlled by
2550 * falcon_interrupts()).
2551 *
2552 * Note: All other fatal interrupts are enabled
2553 */
2554 EFX_POPULATE_OWORD_3(temp,
2555 ILL_ADR_INT_KER_EN, 1,
2556 RBUF_OWN_INT_KER_EN, 1,
2557 TBUF_OWN_INT_KER_EN, 1);
2558 EFX_INVERT_OWORD(temp);
2559 falcon_write(efx, &temp, FATAL_INTR_REG_KER);
2560
2561 /* Set number of RSS queues for receive path. */
2562 falcon_read(efx, &temp, RX_FILTER_CTL_REG);
2563 if (FALCON_REV(efx) >= FALCON_REV_B0)
2564 EFX_SET_OWORD_FIELD(temp, NUM_KER, 0);
2565 else
2566 EFX_SET_OWORD_FIELD(temp, NUM_KER, efx->rss_queues - 1);
2567 if (EFX_WORKAROUND_7244(efx)) {
2568 EFX_SET_OWORD_FIELD(temp, UDP_FULL_SRCH_LIMIT, 8);
2569 EFX_SET_OWORD_FIELD(temp, UDP_WILD_SRCH_LIMIT, 8);
2570 EFX_SET_OWORD_FIELD(temp, TCP_FULL_SRCH_LIMIT, 8);
2571 EFX_SET_OWORD_FIELD(temp, TCP_WILD_SRCH_LIMIT, 8);
2572 }
2573 falcon_write(efx, &temp, RX_FILTER_CTL_REG);
2574
2575 falcon_setup_rss_indir_table(efx);
2576
2577 /* Setup RX. Wait for descriptor is broken and must
2578 * be disabled. RXDP recovery shouldn't be needed, but is.
2579 */
2580 falcon_read(efx, &temp, RX_SELF_RST_REG_KER);
2581 EFX_SET_OWORD_FIELD(temp, RX_NODESC_WAIT_DIS, 1);
2582 EFX_SET_OWORD_FIELD(temp, RX_RECOVERY_EN, 1);
2583 if (EFX_WORKAROUND_5583(efx))
2584 EFX_SET_OWORD_FIELD(temp, RX_ISCSI_DIS, 1);
2585 falcon_write(efx, &temp, RX_SELF_RST_REG_KER);
2586
2587 /* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be
2588 * controlled by the RX FIFO fill level. Set arbitration to one pkt/Q.
2589 */
2590 falcon_read(efx, &temp, TX_CFG2_REG_KER);
2591 EFX_SET_OWORD_FIELD(temp, TX_RX_SPACER, 0xfe);
2592 EFX_SET_OWORD_FIELD(temp, TX_RX_SPACER_EN, 1);
2593 EFX_SET_OWORD_FIELD(temp, TX_ONE_PKT_PER_Q, 1);
2594 EFX_SET_OWORD_FIELD(temp, TX_CSR_PUSH_EN, 0);
2595 EFX_SET_OWORD_FIELD(temp, TX_DIS_NON_IP_EV, 1);
2596 /* Enable SW_EV to inherit in char driver - assume harmless here */
2597 EFX_SET_OWORD_FIELD(temp, TX_SW_EV_EN, 1);
2598 /* Prefetch threshold 2 => fetch when descriptor cache half empty */
2599 EFX_SET_OWORD_FIELD(temp, TX_PREF_THRESHOLD, 2);
2600 /* Squash TX of packets of 16 bytes or less */
2601 if (FALCON_REV(efx) >= FALCON_REV_B0 && EFX_WORKAROUND_9141(efx))
2602 EFX_SET_OWORD_FIELD(temp, TX_FLUSH_MIN_LEN_EN_B0, 1);
2603 falcon_write(efx, &temp, TX_CFG2_REG_KER);
2604
2605 /* Do not enable TX_NO_EOP_DISC_EN, since it limits packets to 16
2606 * descriptors (which is bad).
2607 */
2608 falcon_read(efx, &temp, TX_CFG_REG_KER);
2609 EFX_SET_OWORD_FIELD(temp, TX_NO_EOP_DISC_EN, 0);
2610 falcon_write(efx, &temp, TX_CFG_REG_KER);
2611
2612 /* RX config */
2613 falcon_read(efx, &temp, RX_CFG_REG_KER);
2614 EFX_SET_OWORD_FIELD_VER(efx, temp, RX_DESC_PUSH_EN, 0);
2615 if (EFX_WORKAROUND_7575(efx))
2616 EFX_SET_OWORD_FIELD_VER(efx, temp, RX_USR_BUF_SIZE,
2617 (3 * 4096) / 32);
2618 if (FALCON_REV(efx) >= FALCON_REV_B0)
2619 EFX_SET_OWORD_FIELD(temp, RX_INGR_EN_B0, 1);
2620
2621 /* RX FIFO flow control thresholds */
2622 thresh = ((rx_xon_thresh_bytes >= 0) ?
2623 rx_xon_thresh_bytes : efx->type->rx_xon_thresh);
2624 EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XON_MAC_TH, thresh / 256);
2625 thresh = ((rx_xoff_thresh_bytes >= 0) ?
2626 rx_xoff_thresh_bytes : efx->type->rx_xoff_thresh);
2627 EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XOFF_MAC_TH, thresh / 256);
2628 /* RX control FIFO thresholds [32 entries] */
2629 EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XON_TX_TH, 25);
2630 EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XOFF_TX_TH, 20);
2631 falcon_write(efx, &temp, RX_CFG_REG_KER);
2632
2633 /* Set destination of both TX and RX Flush events */
2634 if (FALCON_REV(efx) >= FALCON_REV_B0) {
2635 EFX_POPULATE_OWORD_1(temp, FLS_EVQ_ID, 0);
2636 falcon_write(efx, &temp, DP_CTRL_REG);
2637 }
2638
2639 return 0;
2640}
2641
2642void falcon_remove_nic(struct efx_nic *efx)
2643{
2644 struct falcon_nic_data *nic_data = efx->nic_data;
2645
2646 falcon_free_buffer(efx, &efx->irq_status);
2647
2648 (void) falcon_reset_hw(efx, RESET_TYPE_ALL);
2649
2650 /* Release the second function after the reset */
2651 if (nic_data->pci_dev2) {
2652 pci_dev_put(nic_data->pci_dev2);
2653 nic_data->pci_dev2 = NULL;
2654 }
2655
2656 /* Tear down the private nic state */
2657 kfree(efx->nic_data);
2658 efx->nic_data = NULL;
2659}
2660
2661void falcon_update_nic_stats(struct efx_nic *efx)
2662{
2663 efx_oword_t cnt;
2664
2665 falcon_read(efx, &cnt, RX_NODESC_DROP_REG_KER);
2666 efx->n_rx_nodesc_drop_cnt += EFX_OWORD_FIELD(cnt, RX_NODESC_DROP_CNT);
2667}
2668
2669/**************************************************************************
2670 *
2671 * Revision-dependent attributes used by efx.c
2672 *
2673 **************************************************************************
2674 */
2675
2676struct efx_nic_type falcon_a_nic_type = {
2677 .mem_bar = 2,
2678 .mem_map_size = 0x20000,
2679 .txd_ptr_tbl_base = TX_DESC_PTR_TBL_KER_A1,
2680 .rxd_ptr_tbl_base = RX_DESC_PTR_TBL_KER_A1,
2681 .buf_tbl_base = BUF_TBL_KER_A1,
2682 .evq_ptr_tbl_base = EVQ_PTR_TBL_KER_A1,
2683 .evq_rptr_tbl_base = EVQ_RPTR_REG_KER_A1,
2684 .txd_ring_mask = FALCON_TXD_RING_MASK,
2685 .rxd_ring_mask = FALCON_RXD_RING_MASK,
2686 .evq_size = FALCON_EVQ_SIZE,
2687 .max_dma_mask = FALCON_DMA_MASK,
2688 .tx_dma_mask = FALCON_TX_DMA_MASK,
2689 .bug5391_mask = 0xf,
2690 .rx_xoff_thresh = 2048,
2691 .rx_xon_thresh = 512,
2692 .rx_buffer_padding = 0x24,
2693 .max_interrupt_mode = EFX_INT_MODE_MSI,
2694 .phys_addr_channels = 4,
2695};
2696
2697struct efx_nic_type falcon_b_nic_type = {
2698 .mem_bar = 2,
2699 /* Map everything up to and including the RSS indirection
2700 * table. Don't map MSI-X table, MSI-X PBA since Linux
2701 * requires that they not be mapped. */
2702 .mem_map_size = RX_RSS_INDIR_TBL_B0 + 0x800,
2703 .txd_ptr_tbl_base = TX_DESC_PTR_TBL_KER_B0,
2704 .rxd_ptr_tbl_base = RX_DESC_PTR_TBL_KER_B0,
2705 .buf_tbl_base = BUF_TBL_KER_B0,
2706 .evq_ptr_tbl_base = EVQ_PTR_TBL_KER_B0,
2707 .evq_rptr_tbl_base = EVQ_RPTR_REG_KER_B0,
2708 .txd_ring_mask = FALCON_TXD_RING_MASK,
2709 .rxd_ring_mask = FALCON_RXD_RING_MASK,
2710 .evq_size = FALCON_EVQ_SIZE,
2711 .max_dma_mask = FALCON_DMA_MASK,
2712 .tx_dma_mask = FALCON_TX_DMA_MASK,
2713 .bug5391_mask = 0,
2714 .rx_xoff_thresh = 54272, /* ~80Kb - 3*max MTU */
2715 .rx_xon_thresh = 27648, /* ~3*max MTU */
2716 .rx_buffer_padding = 0,
2717 .max_interrupt_mode = EFX_INT_MODE_MSIX,
2718 .phys_addr_channels = 32, /* Hardware limit is 64, but the legacy
2719 * interrupt handler only supports 32
2720 * channels */
2721};
2722
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 13:53:43 -0500