1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2 /* QLogic qed NIC Driver
3  * Copyright (c) 2015-2017  QLogic Corporation
4  * Copyright (c) 2019-2020 Marvell International Ltd.
5  */
6 
7 #include <linux/types.h>
8 #include <asm/byteorder.h>
9 #include <linux/io.h>
10 #include <linux/delay.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/errno.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/pci.h>
16 #include <linux/slab.h>
17 #include <linux/spinlock.h>
18 #include <linux/string.h>
19 #include "qed.h"
20 #include "qed_cxt.h"
21 #include "qed_dev_api.h"
22 #include "qed_hsi.h"
23 #include "qed_iro_hsi.h"
24 #include "qed_hw.h"
25 #include "qed_int.h"
26 #include "qed_iscsi.h"
27 #include "qed_mcp.h"
28 #include "qed_ooo.h"
29 #include "qed_reg_addr.h"
30 #include "qed_sp.h"
31 #include "qed_sriov.h"
32 #include "qed_rdma.h"
33 
34 /***************************************************************************
35  * Structures & Definitions
36  ***************************************************************************/
37 
38 #define SPQ_HIGH_PRI_RESERVE_DEFAULT    (1)
39 
40 #define SPQ_BLOCK_DELAY_MAX_ITER        (10)
41 #define SPQ_BLOCK_DELAY_US              (10)
42 #define SPQ_BLOCK_SLEEP_MAX_ITER        (1000)
43 #define SPQ_BLOCK_SLEEP_MS              (5)
44 
45 /***************************************************************************
46  * Blocking Imp. (BLOCK/EBLOCK mode)
47  ***************************************************************************/
qed_spq_blocking_cb(struct qed_hwfn * p_hwfn,void * cookie,union event_ring_data * data,u8 fw_return_code)48 static void qed_spq_blocking_cb(struct qed_hwfn *p_hwfn,
49 				void *cookie,
50 				union event_ring_data *data, u8 fw_return_code)
51 {
52 	struct qed_spq_comp_done *comp_done;
53 
54 	comp_done = (struct qed_spq_comp_done *)cookie;
55 
56 	comp_done->fw_return_code = fw_return_code;
57 
58 	/* Make sure completion done is visible on waiting thread */
59 	smp_store_release(&comp_done->done, 0x1);
60 }
61 
__qed_spq_block(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent,u8 * p_fw_ret,bool sleep_between_iter)62 static int __qed_spq_block(struct qed_hwfn *p_hwfn,
63 			   struct qed_spq_entry *p_ent,
64 			   u8 *p_fw_ret, bool sleep_between_iter)
65 {
66 	struct qed_spq_comp_done *comp_done;
67 	u32 iter_cnt;
68 
69 	comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie;
70 	iter_cnt = sleep_between_iter ? SPQ_BLOCK_SLEEP_MAX_ITER
71 				      : SPQ_BLOCK_DELAY_MAX_ITER;
72 
73 	while (iter_cnt--) {
74 		/* Validate we receive completion update */
75 		if (smp_load_acquire(&comp_done->done) == 1) { /* ^^^ */
76 			if (p_fw_ret)
77 				*p_fw_ret = comp_done->fw_return_code;
78 			return 0;
79 		}
80 
81 		if (sleep_between_iter)
82 			msleep(SPQ_BLOCK_SLEEP_MS);
83 		else
84 			udelay(SPQ_BLOCK_DELAY_US);
85 	}
86 
87 	return -EBUSY;
88 }
89 
qed_spq_block(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent,u8 * p_fw_ret,bool skip_quick_poll)90 static int qed_spq_block(struct qed_hwfn *p_hwfn,
91 			 struct qed_spq_entry *p_ent,
92 			 u8 *p_fw_ret, bool skip_quick_poll)
93 {
94 	struct qed_spq_comp_done *comp_done;
95 	struct qed_ptt *p_ptt;
96 	int rc;
97 
98 	/* A relatively short polling period w/o sleeping, to allow the FW to
99 	 * complete the ramrod and thus possibly to avoid the following sleeps.
100 	 */
101 	if (!skip_quick_poll) {
102 		rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, false);
103 		if (!rc)
104 			return 0;
105 	}
106 
107 	/* Move to polling with a sleeping period between iterations */
108 	rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, true);
109 	if (!rc)
110 		return 0;
111 
112 	p_ptt = qed_ptt_acquire(p_hwfn);
113 	if (!p_ptt) {
114 		DP_NOTICE(p_hwfn, "ptt, failed to acquire\n");
115 		return -EAGAIN;
116 	}
117 
118 	DP_INFO(p_hwfn, "Ramrod is stuck, requesting MCP drain\n");
119 	rc = qed_mcp_drain(p_hwfn, p_ptt);
120 	qed_ptt_release(p_hwfn, p_ptt);
121 	if (rc) {
122 		DP_NOTICE(p_hwfn, "MCP drain failed\n");
123 		goto err;
124 	}
125 
126 	/* Retry after drain */
127 	rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, true);
128 	if (!rc)
129 		return 0;
130 
131 	comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie;
132 	if (comp_done->done == 1) {
133 		if (p_fw_ret)
134 			*p_fw_ret = comp_done->fw_return_code;
135 		return 0;
136 	}
137 err:
138 	p_ptt = qed_ptt_acquire(p_hwfn);
139 	if (!p_ptt)
140 		return -EBUSY;
141 	qed_hw_err_notify(p_hwfn, p_ptt, QED_HW_ERR_RAMROD_FAIL,
142 			  "Ramrod is stuck [CID %08x %s:%02x %s:%02x echo %04x]\n",
143 			  le32_to_cpu(p_ent->elem.hdr.cid),
144 			  qed_get_ramrod_cmd_id_str(p_ent->elem.hdr.protocol_id,
145 						    p_ent->elem.hdr.cmd_id),
146 			  p_ent->elem.hdr.cmd_id,
147 			  qed_get_protocol_type_str(p_ent->elem.hdr.protocol_id),
148 						    p_ent->elem.hdr.protocol_id,
149 			  le16_to_cpu(p_ent->elem.hdr.echo));
150 	qed_ptt_release(p_hwfn, p_ptt);
151 
152 	return -EBUSY;
153 }
154 
155 /***************************************************************************
156  * SPQ entries inner API
157  ***************************************************************************/
qed_spq_fill_entry(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent)158 static int qed_spq_fill_entry(struct qed_hwfn *p_hwfn,
159 			      struct qed_spq_entry *p_ent)
160 {
161 	p_ent->flags = 0;
162 
163 	switch (p_ent->comp_mode) {
164 	case QED_SPQ_MODE_EBLOCK:
165 	case QED_SPQ_MODE_BLOCK:
166 		p_ent->comp_cb.function = qed_spq_blocking_cb;
167 		break;
168 	case QED_SPQ_MODE_CB:
169 		break;
170 	default:
171 		DP_NOTICE(p_hwfn, "Unknown SPQE completion mode %d\n",
172 			  p_ent->comp_mode);
173 		return -EINVAL;
174 	}
175 
176 	DP_VERBOSE(p_hwfn,
177 		   QED_MSG_SPQ,
178 		   "Ramrod hdr: [CID 0x%08x %s:0x%02x %s:0x%02x] Data ptr: [%08x:%08x] Cmpltion Mode: %s\n",
179 		   p_ent->elem.hdr.cid,
180 		   qed_get_ramrod_cmd_id_str(p_ent->elem.hdr.protocol_id,
181 					     p_ent->elem.hdr.cmd_id),
182 		   p_ent->elem.hdr.cmd_id,
183 		   qed_get_protocol_type_str(p_ent->elem.hdr.protocol_id),
184 					     p_ent->elem.hdr.protocol_id,
185 		   p_ent->elem.data_ptr.hi, p_ent->elem.data_ptr.lo,
186 		   D_TRINE(p_ent->comp_mode, QED_SPQ_MODE_EBLOCK,
187 			   QED_SPQ_MODE_BLOCK, "MODE_EBLOCK", "MODE_BLOCK",
188 			   "MODE_CB"));
189 
190 	return 0;
191 }
192 
193 /***************************************************************************
194  * HSI access
195  ***************************************************************************/
qed_spq_hw_initialize(struct qed_hwfn * p_hwfn,struct qed_spq * p_spq)196 static void qed_spq_hw_initialize(struct qed_hwfn *p_hwfn,
197 				  struct qed_spq *p_spq)
198 {
199 	struct core_conn_context *p_cxt;
200 	struct qed_cxt_info cxt_info;
201 	u16 physical_q;
202 	int rc;
203 
204 	cxt_info.iid = p_spq->cid;
205 
206 	rc = qed_cxt_get_cid_info(p_hwfn, &cxt_info);
207 
208 	if (rc < 0) {
209 		DP_NOTICE(p_hwfn, "Cannot find context info for cid=%d\n",
210 			  p_spq->cid);
211 		return;
212 	}
213 
214 	p_cxt = cxt_info.p_cxt;
215 
216 	SET_FIELD(p_cxt->xstorm_ag_context.flags10,
217 		  XSTORM_CORE_CONN_AG_CTX_DQ_CF_EN, 1);
218 	SET_FIELD(p_cxt->xstorm_ag_context.flags1,
219 		  XSTORM_CORE_CONN_AG_CTX_DQ_CF_ACTIVE, 1);
220 	SET_FIELD(p_cxt->xstorm_ag_context.flags9,
221 		  XSTORM_CORE_CONN_AG_CTX_CONSOLID_PROD_CF_EN, 1);
222 
223 	/* QM physical queue */
224 	physical_q = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_LB);
225 	p_cxt->xstorm_ag_context.physical_q0 = cpu_to_le16(physical_q);
226 
227 	p_cxt->xstorm_st_context.spq_base_addr.lo =
228 		DMA_LO_LE(p_spq->chain.p_phys_addr);
229 	p_cxt->xstorm_st_context.spq_base_addr.hi =
230 		DMA_HI_LE(p_spq->chain.p_phys_addr);
231 }
232 
qed_spq_hw_post(struct qed_hwfn * p_hwfn,struct qed_spq * p_spq,struct qed_spq_entry * p_ent)233 static int qed_spq_hw_post(struct qed_hwfn *p_hwfn,
234 			   struct qed_spq *p_spq, struct qed_spq_entry *p_ent)
235 {
236 	struct qed_chain *p_chain = &p_hwfn->p_spq->chain;
237 	struct core_db_data *p_db_data = &p_spq->db_data;
238 	u16 echo = qed_chain_get_prod_idx(p_chain);
239 	struct slow_path_element	*elem;
240 
241 	p_ent->elem.hdr.echo	= cpu_to_le16(echo);
242 	elem = qed_chain_produce(p_chain);
243 	if (!elem) {
244 		DP_NOTICE(p_hwfn, "Failed to produce from SPQ chain\n");
245 		return -EINVAL;
246 	}
247 
248 	*elem = p_ent->elem; /* struct assignment */
249 
250 	/* send a doorbell on the slow hwfn session */
251 	p_db_data->spq_prod = cpu_to_le16(qed_chain_get_prod_idx(p_chain));
252 
253 	/* make sure the SPQE is updated before the doorbell */
254 	wmb();
255 
256 	DOORBELL(p_hwfn, p_spq->db_addr_offset, *(u32 *)p_db_data);
257 
258 	/* make sure doorbell is rang */
259 	wmb();
260 
261 	DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
262 		   "Doorbelled [0x%08x, CID 0x%08x] with Flags: %02x agg_params: %02x, prod: %04x\n",
263 		   p_spq->db_addr_offset,
264 		   p_spq->cid,
265 		   p_db_data->params,
266 		   p_db_data->agg_flags, qed_chain_get_prod_idx(p_chain));
267 
268 	return 0;
269 }
270 
271 /***************************************************************************
272  * Asynchronous events
273  ***************************************************************************/
274 static int
qed_async_event_completion(struct qed_hwfn * p_hwfn,struct event_ring_entry * p_eqe)275 qed_async_event_completion(struct qed_hwfn *p_hwfn,
276 			   struct event_ring_entry *p_eqe)
277 {
278 	qed_spq_async_comp_cb cb;
279 
280 	if (!p_hwfn->p_spq)
281 		return -EINVAL;
282 
283 	if (p_eqe->protocol_id >= MAX_PROTOCOL_TYPE) {
284 		DP_ERR(p_hwfn, "Wrong protocol: %s:%d\n",
285 		       qed_get_protocol_type_str(p_eqe->protocol_id),
286 		       p_eqe->protocol_id);
287 
288 		return -EINVAL;
289 	}
290 
291 	cb = p_hwfn->p_spq->async_comp_cb[p_eqe->protocol_id];
292 	if (cb) {
293 		return cb(p_hwfn, p_eqe->opcode, p_eqe->echo,
294 			  &p_eqe->data, p_eqe->fw_return_code);
295 	} else {
296 		DP_NOTICE(p_hwfn,
297 			  "Unknown Async completion for %s:%d\n",
298 			  qed_get_protocol_type_str(p_eqe->protocol_id),
299 			  p_eqe->protocol_id);
300 
301 		return -EINVAL;
302 	}
303 }
304 
305 int
qed_spq_register_async_cb(struct qed_hwfn * p_hwfn,enum protocol_type protocol_id,qed_spq_async_comp_cb cb)306 qed_spq_register_async_cb(struct qed_hwfn *p_hwfn,
307 			  enum protocol_type protocol_id,
308 			  qed_spq_async_comp_cb cb)
309 {
310 	if (!p_hwfn->p_spq || (protocol_id >= MAX_PROTOCOL_TYPE))
311 		return -EINVAL;
312 
313 	p_hwfn->p_spq->async_comp_cb[protocol_id] = cb;
314 	return 0;
315 }
316 
317 void
qed_spq_unregister_async_cb(struct qed_hwfn * p_hwfn,enum protocol_type protocol_id)318 qed_spq_unregister_async_cb(struct qed_hwfn *p_hwfn,
319 			    enum protocol_type protocol_id)
320 {
321 	if (!p_hwfn->p_spq || (protocol_id >= MAX_PROTOCOL_TYPE))
322 		return;
323 
324 	p_hwfn->p_spq->async_comp_cb[protocol_id] = NULL;
325 }
326 
327 /***************************************************************************
328  * EQ API
329  ***************************************************************************/
qed_eq_prod_update(struct qed_hwfn * p_hwfn,u16 prod)330 void qed_eq_prod_update(struct qed_hwfn *p_hwfn, u16 prod)
331 {
332 	u32 addr = GET_GTT_REG_ADDR(GTT_BAR0_MAP_REG_USDM_RAM,
333 				    USTORM_EQE_CONS, p_hwfn->rel_pf_id);
334 
335 	REG_WR16(p_hwfn, addr, prod);
336 }
337 
qed_eq_completion(struct qed_hwfn * p_hwfn,void * cookie)338 int qed_eq_completion(struct qed_hwfn *p_hwfn, void *cookie)
339 {
340 	struct qed_eq *p_eq = cookie;
341 	struct qed_chain *p_chain = &p_eq->chain;
342 	int rc = 0;
343 
344 	/* take a snapshot of the FW consumer */
345 	u16 fw_cons_idx = le16_to_cpu(*p_eq->p_fw_cons);
346 
347 	DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "fw_cons_idx %x\n", fw_cons_idx);
348 
349 	/* Need to guarantee the fw_cons index we use points to a usuable
350 	 * element (to comply with our chain), so our macros would comply
351 	 */
352 	if ((fw_cons_idx & qed_chain_get_usable_per_page(p_chain)) ==
353 	    qed_chain_get_usable_per_page(p_chain))
354 		fw_cons_idx += qed_chain_get_unusable_per_page(p_chain);
355 
356 	/* Complete current segment of eq entries */
357 	while (fw_cons_idx != qed_chain_get_cons_idx(p_chain)) {
358 		struct event_ring_entry *p_eqe = qed_chain_consume(p_chain);
359 
360 		if (!p_eqe) {
361 			rc = -EINVAL;
362 			break;
363 		}
364 
365 		DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
366 			   "op %x prot %x res0 %x echo %x fwret %x flags %x\n",
367 			   p_eqe->opcode,
368 			   p_eqe->protocol_id,
369 			   p_eqe->reserved0,
370 			   le16_to_cpu(p_eqe->echo),
371 			   p_eqe->fw_return_code,
372 			   p_eqe->flags);
373 
374 		if (GET_FIELD(p_eqe->flags, EVENT_RING_ENTRY_ASYNC)) {
375 			if (qed_async_event_completion(p_hwfn, p_eqe))
376 				rc = -EINVAL;
377 		} else if (qed_spq_completion(p_hwfn,
378 					      p_eqe->echo,
379 					      p_eqe->fw_return_code,
380 					      &p_eqe->data)) {
381 			rc = -EINVAL;
382 		}
383 
384 		qed_chain_recycle_consumed(p_chain);
385 	}
386 
387 	qed_eq_prod_update(p_hwfn, qed_chain_get_prod_idx(p_chain));
388 
389 	/* Attempt to post pending requests */
390 	spin_lock_bh(&p_hwfn->p_spq->lock);
391 	rc = qed_spq_pend_post(p_hwfn);
392 	spin_unlock_bh(&p_hwfn->p_spq->lock);
393 
394 	return rc;
395 }
396 
qed_eq_alloc(struct qed_hwfn * p_hwfn,u16 num_elem)397 int qed_eq_alloc(struct qed_hwfn *p_hwfn, u16 num_elem)
398 {
399 	struct qed_chain_init_params params = {
400 		.mode		= QED_CHAIN_MODE_PBL,
401 		.intended_use	= QED_CHAIN_USE_TO_PRODUCE,
402 		.cnt_type	= QED_CHAIN_CNT_TYPE_U16,
403 		.num_elems	= num_elem,
404 		.elem_size	= sizeof(union event_ring_element),
405 	};
406 	struct qed_eq *p_eq;
407 	int ret;
408 
409 	/* Allocate EQ struct */
410 	p_eq = kzalloc(sizeof(*p_eq), GFP_KERNEL);
411 	if (!p_eq)
412 		return -ENOMEM;
413 
414 	ret = qed_chain_alloc(p_hwfn->cdev, &p_eq->chain, &params);
415 	if (ret) {
416 		DP_NOTICE(p_hwfn, "Failed to allocate EQ chain\n");
417 		goto eq_allocate_fail;
418 	}
419 
420 	/* register EQ completion on the SP SB */
421 	qed_int_register_cb(p_hwfn, qed_eq_completion,
422 			    p_eq, &p_eq->eq_sb_index, &p_eq->p_fw_cons);
423 
424 	p_hwfn->p_eq = p_eq;
425 	return 0;
426 
427 eq_allocate_fail:
428 	kfree(p_eq);
429 
430 	return ret;
431 }
432 
qed_eq_setup(struct qed_hwfn * p_hwfn)433 void qed_eq_setup(struct qed_hwfn *p_hwfn)
434 {
435 	qed_chain_reset(&p_hwfn->p_eq->chain);
436 }
437 
qed_eq_free(struct qed_hwfn * p_hwfn)438 void qed_eq_free(struct qed_hwfn *p_hwfn)
439 {
440 	if (!p_hwfn->p_eq)
441 		return;
442 
443 	qed_chain_free(p_hwfn->cdev, &p_hwfn->p_eq->chain);
444 
445 	kfree(p_hwfn->p_eq);
446 	p_hwfn->p_eq = NULL;
447 }
448 
449 /***************************************************************************
450  * CQE API - manipulate EQ functionality
451  ***************************************************************************/
qed_cqe_completion(struct qed_hwfn * p_hwfn,struct eth_slow_path_rx_cqe * cqe,enum protocol_type protocol)452 static int qed_cqe_completion(struct qed_hwfn *p_hwfn,
453 			      struct eth_slow_path_rx_cqe *cqe,
454 			      enum protocol_type protocol)
455 {
456 	if (IS_VF(p_hwfn->cdev))
457 		return 0;
458 
459 	/* @@@tmp - it's possible we'll eventually want to handle some
460 	 * actual commands that can arrive here, but for now this is only
461 	 * used to complete the ramrod using the echo value on the cqe
462 	 */
463 	return qed_spq_completion(p_hwfn, cqe->echo, 0, NULL);
464 }
465 
qed_eth_cqe_completion(struct qed_hwfn * p_hwfn,struct eth_slow_path_rx_cqe * cqe)466 int qed_eth_cqe_completion(struct qed_hwfn *p_hwfn,
467 			   struct eth_slow_path_rx_cqe *cqe)
468 {
469 	int rc;
470 
471 	rc = qed_cqe_completion(p_hwfn, cqe, PROTOCOLID_ETH);
472 	if (rc)
473 		DP_NOTICE(p_hwfn,
474 			  "Failed to handle RXQ CQE [cmd 0x%02x]\n",
475 			  cqe->ramrod_cmd_id);
476 
477 	return rc;
478 }
479 
480 /***************************************************************************
481  * Slow hwfn Queue (spq)
482  ***************************************************************************/
qed_spq_setup(struct qed_hwfn * p_hwfn)483 void qed_spq_setup(struct qed_hwfn *p_hwfn)
484 {
485 	struct qed_spq *p_spq = p_hwfn->p_spq;
486 	struct qed_spq_entry *p_virt = NULL;
487 	struct core_db_data *p_db_data;
488 	void __iomem *db_addr;
489 	dma_addr_t p_phys = 0;
490 	u32 i, capacity;
491 	int rc;
492 
493 	INIT_LIST_HEAD(&p_spq->pending);
494 	INIT_LIST_HEAD(&p_spq->completion_pending);
495 	INIT_LIST_HEAD(&p_spq->free_pool);
496 	INIT_LIST_HEAD(&p_spq->unlimited_pending);
497 	spin_lock_init(&p_spq->lock);
498 
499 	/* SPQ empty pool */
500 	p_phys	= p_spq->p_phys + offsetof(struct qed_spq_entry, ramrod);
501 	p_virt	= p_spq->p_virt;
502 
503 	capacity = qed_chain_get_capacity(&p_spq->chain);
504 	for (i = 0; i < capacity; i++) {
505 		DMA_REGPAIR_LE(p_virt->elem.data_ptr, p_phys);
506 
507 		list_add_tail(&p_virt->list, &p_spq->free_pool);
508 
509 		p_virt++;
510 		p_phys += sizeof(struct qed_spq_entry);
511 	}
512 
513 	/* Statistics */
514 	p_spq->normal_count		= 0;
515 	p_spq->comp_count		= 0;
516 	p_spq->comp_sent_count		= 0;
517 	p_spq->unlimited_pending_count	= 0;
518 
519 	bitmap_zero(p_spq->p_comp_bitmap, SPQ_RING_SIZE);
520 	p_spq->comp_bitmap_idx = 0;
521 
522 	/* SPQ cid, cannot fail */
523 	qed_cxt_acquire_cid(p_hwfn, PROTOCOLID_CORE, &p_spq->cid);
524 	qed_spq_hw_initialize(p_hwfn, p_spq);
525 
526 	/* reset the chain itself */
527 	qed_chain_reset(&p_spq->chain);
528 
529 	/* Initialize the address/data of the SPQ doorbell */
530 	p_spq->db_addr_offset = qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY);
531 	p_db_data = &p_spq->db_data;
532 	memset(p_db_data, 0, sizeof(*p_db_data));
533 	SET_FIELD(p_db_data->params, CORE_DB_DATA_DEST, DB_DEST_XCM);
534 	SET_FIELD(p_db_data->params, CORE_DB_DATA_AGG_CMD, DB_AGG_CMD_MAX);
535 	SET_FIELD(p_db_data->params, CORE_DB_DATA_AGG_VAL_SEL,
536 		  DQ_XCM_CORE_SPQ_PROD_CMD);
537 	p_db_data->agg_flags = DQ_XCM_CORE_DQ_CF_CMD;
538 
539 	/* Register the SPQ doorbell with the doorbell recovery mechanism */
540 	db_addr = (void __iomem *)((u8 __iomem *)p_hwfn->doorbells +
541 				   p_spq->db_addr_offset);
542 	rc = qed_db_recovery_add(p_hwfn->cdev, db_addr, &p_spq->db_data,
543 				 DB_REC_WIDTH_32B, DB_REC_KERNEL);
544 	if (rc)
545 		DP_INFO(p_hwfn,
546 			"Failed to register the SPQ doorbell with the doorbell recovery mechanism\n");
547 }
548 
qed_spq_alloc(struct qed_hwfn * p_hwfn)549 int qed_spq_alloc(struct qed_hwfn *p_hwfn)
550 {
551 	struct qed_chain_init_params params = {
552 		.mode		= QED_CHAIN_MODE_SINGLE,
553 		.intended_use	= QED_CHAIN_USE_TO_PRODUCE,
554 		.cnt_type	= QED_CHAIN_CNT_TYPE_U16,
555 		.elem_size	= sizeof(struct slow_path_element),
556 	};
557 	struct qed_dev *cdev = p_hwfn->cdev;
558 	struct qed_spq_entry *p_virt = NULL;
559 	struct qed_spq *p_spq = NULL;
560 	dma_addr_t p_phys = 0;
561 	u32 capacity;
562 	int ret;
563 
564 	/* SPQ struct */
565 	p_spq = kzalloc(sizeof(*p_spq), GFP_KERNEL);
566 	if (!p_spq)
567 		return -ENOMEM;
568 
569 	/* SPQ ring */
570 	ret = qed_chain_alloc(cdev, &p_spq->chain, &params);
571 	if (ret) {
572 		DP_NOTICE(p_hwfn, "Failed to allocate SPQ chain\n");
573 		goto spq_chain_alloc_fail;
574 	}
575 
576 	/* allocate and fill the SPQ elements (incl. ramrod data list) */
577 	capacity = qed_chain_get_capacity(&p_spq->chain);
578 	ret = -ENOMEM;
579 
580 	p_virt = dma_alloc_coherent(&cdev->pdev->dev,
581 				    capacity * sizeof(struct qed_spq_entry),
582 				    &p_phys, GFP_KERNEL);
583 	if (!p_virt)
584 		goto spq_alloc_fail;
585 
586 	p_spq->p_virt = p_virt;
587 	p_spq->p_phys = p_phys;
588 	p_hwfn->p_spq = p_spq;
589 
590 	return 0;
591 
592 spq_alloc_fail:
593 	qed_chain_free(cdev, &p_spq->chain);
594 spq_chain_alloc_fail:
595 	kfree(p_spq);
596 
597 	return ret;
598 }
599 
qed_spq_free(struct qed_hwfn * p_hwfn)600 void qed_spq_free(struct qed_hwfn *p_hwfn)
601 {
602 	struct qed_spq *p_spq = p_hwfn->p_spq;
603 	void __iomem *db_addr;
604 	u32 capacity;
605 
606 	if (!p_spq)
607 		return;
608 
609 	/* Delete the SPQ doorbell from the doorbell recovery mechanism */
610 	db_addr = (void __iomem *)((u8 __iomem *)p_hwfn->doorbells +
611 				   p_spq->db_addr_offset);
612 	qed_db_recovery_del(p_hwfn->cdev, db_addr, &p_spq->db_data);
613 
614 	if (p_spq->p_virt) {
615 		capacity = qed_chain_get_capacity(&p_spq->chain);
616 		dma_free_coherent(&p_hwfn->cdev->pdev->dev,
617 				  capacity *
618 				  sizeof(struct qed_spq_entry),
619 				  p_spq->p_virt, p_spq->p_phys);
620 	}
621 
622 	qed_chain_free(p_hwfn->cdev, &p_spq->chain);
623 	kfree(p_spq);
624 	p_hwfn->p_spq = NULL;
625 }
626 
qed_spq_get_entry(struct qed_hwfn * p_hwfn,struct qed_spq_entry ** pp_ent)627 int qed_spq_get_entry(struct qed_hwfn *p_hwfn, struct qed_spq_entry **pp_ent)
628 {
629 	struct qed_spq *p_spq = p_hwfn->p_spq;
630 	struct qed_spq_entry *p_ent = NULL;
631 	int rc = 0;
632 
633 	spin_lock_bh(&p_spq->lock);
634 
635 	if (list_empty(&p_spq->free_pool)) {
636 		p_ent = kzalloc(sizeof(*p_ent), GFP_ATOMIC);
637 		if (!p_ent) {
638 			DP_NOTICE(p_hwfn,
639 				  "Failed to allocate an SPQ entry for a pending ramrod\n");
640 			rc = -ENOMEM;
641 			goto out_unlock;
642 		}
643 		p_ent->queue = &p_spq->unlimited_pending;
644 	} else {
645 		p_ent = list_first_entry(&p_spq->free_pool,
646 					 struct qed_spq_entry, list);
647 		list_del(&p_ent->list);
648 		p_ent->queue = &p_spq->pending;
649 	}
650 
651 	*pp_ent = p_ent;
652 
653 out_unlock:
654 	spin_unlock_bh(&p_spq->lock);
655 	return rc;
656 }
657 
658 /* Locked variant; Should be called while the SPQ lock is taken */
__qed_spq_return_entry(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent)659 static void __qed_spq_return_entry(struct qed_hwfn *p_hwfn,
660 				   struct qed_spq_entry *p_ent)
661 {
662 	list_add_tail(&p_ent->list, &p_hwfn->p_spq->free_pool);
663 }
664 
qed_spq_return_entry(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent)665 void qed_spq_return_entry(struct qed_hwfn *p_hwfn, struct qed_spq_entry *p_ent)
666 {
667 	spin_lock_bh(&p_hwfn->p_spq->lock);
668 	__qed_spq_return_entry(p_hwfn, p_ent);
669 	spin_unlock_bh(&p_hwfn->p_spq->lock);
670 }
671 
672 /**
673  * qed_spq_add_entry() - Add a new entry to the pending list.
674  *                       Should be used while lock is being held.
675  *
676  * @p_hwfn: HW device data.
677  * @p_ent: An entry to add.
678  * @priority: Desired priority.
679  *
680  * Adds an entry to the pending list is there is room (an empty
681  * element is available in the free_pool), or else places the
682  * entry in the unlimited_pending pool.
683  *
684  * Return: zero on success, -EINVAL on invalid @priority.
685  */
qed_spq_add_entry(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent,enum spq_priority priority)686 static int qed_spq_add_entry(struct qed_hwfn *p_hwfn,
687 			     struct qed_spq_entry *p_ent,
688 			     enum spq_priority priority)
689 {
690 	struct qed_spq *p_spq = p_hwfn->p_spq;
691 
692 	if (p_ent->queue == &p_spq->unlimited_pending) {
693 		if (list_empty(&p_spq->free_pool)) {
694 			list_add_tail(&p_ent->list, &p_spq->unlimited_pending);
695 			p_spq->unlimited_pending_count++;
696 
697 			return 0;
698 		} else {
699 			struct qed_spq_entry *p_en2;
700 
701 			p_en2 = list_first_entry(&p_spq->free_pool,
702 						 struct qed_spq_entry, list);
703 			list_del(&p_en2->list);
704 
705 			/* Copy the ring element physical pointer to the new
706 			 * entry, since we are about to override the entire ring
707 			 * entry and don't want to lose the pointer.
708 			 */
709 			p_ent->elem.data_ptr = p_en2->elem.data_ptr;
710 
711 			*p_en2 = *p_ent;
712 
713 			/* EBLOCK responsible to free the allocated p_ent */
714 			if (p_ent->comp_mode != QED_SPQ_MODE_EBLOCK)
715 				kfree(p_ent);
716 			else
717 				p_ent->post_ent = p_en2;
718 
719 			p_ent = p_en2;
720 		}
721 	}
722 
723 	/* entry is to be placed in 'pending' queue */
724 	switch (priority) {
725 	case QED_SPQ_PRIORITY_NORMAL:
726 		list_add_tail(&p_ent->list, &p_spq->pending);
727 		p_spq->normal_count++;
728 		break;
729 	case QED_SPQ_PRIORITY_HIGH:
730 		list_add(&p_ent->list, &p_spq->pending);
731 		p_spq->high_count++;
732 		break;
733 	default:
734 		return -EINVAL;
735 	}
736 
737 	return 0;
738 }
739 
740 /***************************************************************************
741  * Accessor
742  ***************************************************************************/
qed_spq_get_cid(struct qed_hwfn * p_hwfn)743 u32 qed_spq_get_cid(struct qed_hwfn *p_hwfn)
744 {
745 	if (!p_hwfn->p_spq)
746 		return 0xffffffff;      /* illegal */
747 	return p_hwfn->p_spq->cid;
748 }
749 
750 /***************************************************************************
751  * Posting new Ramrods
752  ***************************************************************************/
qed_spq_post_list(struct qed_hwfn * p_hwfn,struct list_head * head,u32 keep_reserve)753 static int qed_spq_post_list(struct qed_hwfn *p_hwfn,
754 			     struct list_head *head, u32 keep_reserve)
755 {
756 	struct qed_spq *p_spq = p_hwfn->p_spq;
757 	int rc;
758 
759 	while (qed_chain_get_elem_left(&p_spq->chain) > keep_reserve &&
760 	       !list_empty(head)) {
761 		struct qed_spq_entry *p_ent =
762 			list_first_entry(head, struct qed_spq_entry, list);
763 		list_move_tail(&p_ent->list, &p_spq->completion_pending);
764 		p_spq->comp_sent_count++;
765 
766 		rc = qed_spq_hw_post(p_hwfn, p_spq, p_ent);
767 		if (rc) {
768 			list_del(&p_ent->list);
769 			__qed_spq_return_entry(p_hwfn, p_ent);
770 			return rc;
771 		}
772 	}
773 
774 	return 0;
775 }
776 
qed_spq_pend_post(struct qed_hwfn * p_hwfn)777 int qed_spq_pend_post(struct qed_hwfn *p_hwfn)
778 {
779 	struct qed_spq *p_spq = p_hwfn->p_spq;
780 	struct qed_spq_entry *p_ent = NULL;
781 
782 	while (!list_empty(&p_spq->free_pool)) {
783 		if (list_empty(&p_spq->unlimited_pending))
784 			break;
785 
786 		p_ent = list_first_entry(&p_spq->unlimited_pending,
787 					 struct qed_spq_entry, list);
788 		if (!p_ent)
789 			return -EINVAL;
790 
791 		list_del(&p_ent->list);
792 
793 		qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
794 	}
795 
796 	return qed_spq_post_list(p_hwfn, &p_spq->pending,
797 				 SPQ_HIGH_PRI_RESERVE_DEFAULT);
798 }
799 
qed_spq_recov_set_ret_code(struct qed_spq_entry * p_ent,u8 * fw_return_code)800 static void qed_spq_recov_set_ret_code(struct qed_spq_entry *p_ent,
801 				       u8 *fw_return_code)
802 {
803 	if (!fw_return_code)
804 		return;
805 
806 	if (p_ent->elem.hdr.protocol_id == PROTOCOLID_ROCE ||
807 	    p_ent->elem.hdr.protocol_id == PROTOCOLID_IWARP)
808 		*fw_return_code = RDMA_RETURN_OK;
809 }
810 
811 /* Avoid overriding of SPQ entries when getting out-of-order completions, by
812  * marking the completions in a bitmap and increasing the chain consumer only
813  * for the first successive completed entries.
814  */
qed_spq_comp_bmap_update(struct qed_hwfn * p_hwfn,__le16 echo)815 static void qed_spq_comp_bmap_update(struct qed_hwfn *p_hwfn, __le16 echo)
816 {
817 	u16 pos = le16_to_cpu(echo) % SPQ_RING_SIZE;
818 	struct qed_spq *p_spq = p_hwfn->p_spq;
819 
820 	__set_bit(pos, p_spq->p_comp_bitmap);
821 	while (test_bit(p_spq->comp_bitmap_idx,
822 			p_spq->p_comp_bitmap)) {
823 		__clear_bit(p_spq->comp_bitmap_idx,
824 			    p_spq->p_comp_bitmap);
825 		p_spq->comp_bitmap_idx++;
826 		qed_chain_return_produced(&p_spq->chain);
827 	}
828 }
829 
qed_spq_post(struct qed_hwfn * p_hwfn,struct qed_spq_entry * p_ent,u8 * fw_return_code)830 int qed_spq_post(struct qed_hwfn *p_hwfn,
831 		 struct qed_spq_entry *p_ent, u8 *fw_return_code)
832 {
833 	int rc = 0;
834 	struct qed_spq *p_spq = p_hwfn ? p_hwfn->p_spq : NULL;
835 	bool b_ret_ent = true;
836 	bool eblock;
837 
838 	if (!p_hwfn)
839 		return -EINVAL;
840 
841 	if (!p_ent) {
842 		DP_NOTICE(p_hwfn, "Got a NULL pointer\n");
843 		return -EINVAL;
844 	}
845 
846 	if (p_hwfn->cdev->recov_in_prog) {
847 		DP_VERBOSE(p_hwfn,
848 			   QED_MSG_SPQ,
849 			   "Recovery is in progress. Skip spq post [%s:%02x %s:%02x]\n",
850 			   qed_get_ramrod_cmd_id_str(p_ent->elem.hdr.protocol_id,
851 						     p_ent->elem.hdr.cmd_id),
852 			   p_ent->elem.hdr.cmd_id,
853 			   qed_get_protocol_type_str(p_ent->elem.hdr.protocol_id),
854 			   p_ent->elem.hdr.protocol_id);
855 
856 		/* Let the flow complete w/o any error handling */
857 		qed_spq_recov_set_ret_code(p_ent, fw_return_code);
858 		return 0;
859 	}
860 
861 	/* Complete the entry */
862 	rc = qed_spq_fill_entry(p_hwfn, p_ent);
863 
864 	spin_lock_bh(&p_spq->lock);
865 
866 	/* Check return value after LOCK is taken for cleaner error flow */
867 	if (rc)
868 		goto spq_post_fail;
869 
870 	/* Check if entry is in block mode before qed_spq_add_entry,
871 	 * which might kfree p_ent.
872 	 */
873 	eblock = (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK);
874 
875 	/* Add the request to the pending queue */
876 	rc = qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
877 	if (rc)
878 		goto spq_post_fail;
879 
880 	rc = qed_spq_pend_post(p_hwfn);
881 	if (rc) {
882 		/* Since it's possible that pending failed for a different
883 		 * entry [although unlikely], the failed entry was already
884 		 * dealt with; No need to return it here.
885 		 */
886 		b_ret_ent = false;
887 		goto spq_post_fail;
888 	}
889 
890 	spin_unlock_bh(&p_spq->lock);
891 
892 	if (eblock) {
893 		/* For entries in QED BLOCK mode, the completion code cannot
894 		 * perform the necessary cleanup - if it did, we couldn't
895 		 * access p_ent here to see whether it's successful or not.
896 		 * Thus, after gaining the answer perform the cleanup here.
897 		 */
898 		rc = qed_spq_block(p_hwfn, p_ent, fw_return_code,
899 				   p_ent->queue == &p_spq->unlimited_pending);
900 
901 		if (p_ent->queue == &p_spq->unlimited_pending) {
902 			struct qed_spq_entry *p_post_ent = p_ent->post_ent;
903 
904 			kfree(p_ent);
905 
906 			/* Return the entry which was actually posted */
907 			p_ent = p_post_ent;
908 		}
909 
910 		if (rc)
911 			goto spq_post_fail2;
912 
913 		/* return to pool */
914 		qed_spq_return_entry(p_hwfn, p_ent);
915 	}
916 	return rc;
917 
918 spq_post_fail2:
919 	spin_lock_bh(&p_spq->lock);
920 	list_del(&p_ent->list);
921 	qed_spq_comp_bmap_update(p_hwfn, p_ent->elem.hdr.echo);
922 
923 spq_post_fail:
924 	/* return to the free pool */
925 	if (b_ret_ent)
926 		__qed_spq_return_entry(p_hwfn, p_ent);
927 	spin_unlock_bh(&p_spq->lock);
928 
929 	return rc;
930 }
931 
qed_spq_completion(struct qed_hwfn * p_hwfn,__le16 echo,u8 fw_return_code,union event_ring_data * p_data)932 int qed_spq_completion(struct qed_hwfn *p_hwfn,
933 		       __le16 echo,
934 		       u8 fw_return_code,
935 		       union event_ring_data *p_data)
936 {
937 	struct qed_spq		*p_spq;
938 	struct qed_spq_entry	*p_ent = NULL;
939 	struct qed_spq_entry	*tmp;
940 	struct qed_spq_entry	*found = NULL;
941 
942 	if (!p_hwfn)
943 		return -EINVAL;
944 
945 	p_spq = p_hwfn->p_spq;
946 	if (!p_spq)
947 		return -EINVAL;
948 
949 	spin_lock_bh(&p_spq->lock);
950 	list_for_each_entry_safe(p_ent, tmp, &p_spq->completion_pending, list) {
951 		if (p_ent->elem.hdr.echo == echo) {
952 			list_del(&p_ent->list);
953 			qed_spq_comp_bmap_update(p_hwfn, echo);
954 			p_spq->comp_count++;
955 			found = p_ent;
956 			break;
957 		}
958 
959 		/* This is relatively uncommon - depends on scenarios
960 		 * which have mutliple per-PF sent ramrods.
961 		 */
962 		DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
963 			   "Got completion for echo %04x - doesn't match echo %04x in completion pending list\n",
964 			   le16_to_cpu(echo),
965 			   le16_to_cpu(p_ent->elem.hdr.echo));
966 	}
967 
968 	/* Release lock before callback, as callback may post
969 	 * an additional ramrod.
970 	 */
971 	spin_unlock_bh(&p_spq->lock);
972 
973 	if (!found) {
974 		DP_NOTICE(p_hwfn,
975 			  "Failed to find an entry this EQE [echo %04x] completes\n",
976 			  le16_to_cpu(echo));
977 		return -EEXIST;
978 	}
979 
980 	DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
981 		   "Complete EQE [echo %04x]: func %p cookie %p)\n",
982 		   le16_to_cpu(echo),
983 		   p_ent->comp_cb.function, p_ent->comp_cb.cookie);
984 	if (found->comp_cb.function)
985 		found->comp_cb.function(p_hwfn, found->comp_cb.cookie, p_data,
986 					fw_return_code);
987 	else
988 		DP_VERBOSE(p_hwfn,
989 			   QED_MSG_SPQ,
990 			   "Got a completion without a callback function\n");
991 
992 	if (found->comp_mode != QED_SPQ_MODE_EBLOCK)
993 		/* EBLOCK  is responsible for returning its own entry into the
994 		 * free list.
995 		 */
996 		qed_spq_return_entry(p_hwfn, found);
997 
998 	return 0;
999 }
1000 
1001 #define QED_SPQ_CONSQ_ELEM_SIZE		0x80
1002 
qed_consq_alloc(struct qed_hwfn * p_hwfn)1003 int qed_consq_alloc(struct qed_hwfn *p_hwfn)
1004 {
1005 	struct qed_chain_init_params params = {
1006 		.mode		= QED_CHAIN_MODE_PBL,
1007 		.intended_use	= QED_CHAIN_USE_TO_PRODUCE,
1008 		.cnt_type	= QED_CHAIN_CNT_TYPE_U16,
1009 		.num_elems	= QED_CHAIN_PAGE_SIZE / QED_SPQ_CONSQ_ELEM_SIZE,
1010 		.elem_size	= QED_SPQ_CONSQ_ELEM_SIZE,
1011 	};
1012 	struct qed_consq *p_consq;
1013 	int ret;
1014 
1015 	/* Allocate ConsQ struct */
1016 	p_consq = kzalloc(sizeof(*p_consq), GFP_KERNEL);
1017 	if (!p_consq)
1018 		return -ENOMEM;
1019 
1020 	/* Allocate and initialize ConsQ chain */
1021 	ret = qed_chain_alloc(p_hwfn->cdev, &p_consq->chain, &params);
1022 	if (ret) {
1023 		DP_NOTICE(p_hwfn, "Failed to allocate ConsQ chain");
1024 		goto consq_alloc_fail;
1025 	}
1026 
1027 	p_hwfn->p_consq = p_consq;
1028 
1029 	return 0;
1030 
1031 consq_alloc_fail:
1032 	kfree(p_consq);
1033 
1034 	return ret;
1035 }
1036 
qed_consq_setup(struct qed_hwfn * p_hwfn)1037 void qed_consq_setup(struct qed_hwfn *p_hwfn)
1038 {
1039 	qed_chain_reset(&p_hwfn->p_consq->chain);
1040 }
1041 
qed_consq_free(struct qed_hwfn * p_hwfn)1042 void qed_consq_free(struct qed_hwfn *p_hwfn)
1043 {
1044 	if (!p_hwfn->p_consq)
1045 		return;
1046 
1047 	qed_chain_free(p_hwfn->cdev, &p_hwfn->p_consq->chain);
1048 
1049 	kfree(p_hwfn->p_consq);
1050 	p_hwfn->p_consq = NULL;
1051 }
1052