1 /* Broadcom NetXtreme-C/E network driver.
2  *
3  * Copyright (c) 2016-2018 Broadcom Limited
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation.
8  */
9 
10 #include <linux/module.h>
11 
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/interrupt.h>
15 #include <linux/pci.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/bitops.h>
19 #include <linux/irq.h>
20 #include <asm/byteorder.h>
21 #include <linux/bitmap.h>
22 
23 #include "bnxt_hsi.h"
24 #include "bnxt.h"
25 #include "bnxt_hwrm.h"
26 #include "bnxt_ulp.h"
27 
bnxt_register_dev(struct bnxt_en_dev * edev,unsigned int ulp_id,struct bnxt_ulp_ops * ulp_ops,void * handle)28 static int bnxt_register_dev(struct bnxt_en_dev *edev, unsigned int ulp_id,
29 			     struct bnxt_ulp_ops *ulp_ops, void *handle)
30 {
31 	struct net_device *dev = edev->net;
32 	struct bnxt *bp = netdev_priv(dev);
33 	struct bnxt_ulp *ulp;
34 
35 	ASSERT_RTNL();
36 	if (ulp_id >= BNXT_MAX_ULP)
37 		return -EINVAL;
38 
39 	ulp = &edev->ulp_tbl[ulp_id];
40 	if (rcu_access_pointer(ulp->ulp_ops)) {
41 		netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id);
42 		return -EBUSY;
43 	}
44 	if (ulp_id == BNXT_ROCE_ULP) {
45 		unsigned int max_stat_ctxs;
46 
47 		max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
48 		if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
49 		    bp->cp_nr_rings == max_stat_ctxs)
50 			return -ENOMEM;
51 	}
52 
53 	atomic_set(&ulp->ref_count, 0);
54 	ulp->handle = handle;
55 	rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
56 
57 	if (ulp_id == BNXT_ROCE_ULP) {
58 		if (test_bit(BNXT_STATE_OPEN, &bp->state))
59 			bnxt_hwrm_vnic_cfg(bp, 0);
60 	}
61 
62 	return 0;
63 }
64 
bnxt_unregister_dev(struct bnxt_en_dev * edev,unsigned int ulp_id)65 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, unsigned int ulp_id)
66 {
67 	struct net_device *dev = edev->net;
68 	struct bnxt *bp = netdev_priv(dev);
69 	struct bnxt_ulp *ulp;
70 	int i = 0;
71 
72 	ASSERT_RTNL();
73 	if (ulp_id >= BNXT_MAX_ULP)
74 		return -EINVAL;
75 
76 	ulp = &edev->ulp_tbl[ulp_id];
77 	if (!rcu_access_pointer(ulp->ulp_ops)) {
78 		netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id);
79 		return -EINVAL;
80 	}
81 	if (ulp_id == BNXT_ROCE_ULP && ulp->msix_requested)
82 		edev->en_ops->bnxt_free_msix(edev, ulp_id);
83 
84 	if (ulp->max_async_event_id)
85 		bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true);
86 
87 	RCU_INIT_POINTER(ulp->ulp_ops, NULL);
88 	synchronize_rcu();
89 	ulp->max_async_event_id = 0;
90 	ulp->async_events_bmap = NULL;
91 	while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
92 		msleep(100);
93 		i++;
94 	}
95 	return 0;
96 }
97 
bnxt_fill_msix_vecs(struct bnxt * bp,struct bnxt_msix_entry * ent)98 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
99 {
100 	struct bnxt_en_dev *edev = bp->edev;
101 	int num_msix, idx, i;
102 
103 	num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
104 	idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
105 	for (i = 0; i < num_msix; i++) {
106 		ent[i].vector = bp->irq_tbl[idx + i].vector;
107 		ent[i].ring_idx = idx + i;
108 		if (bp->flags & BNXT_FLAG_CHIP_P5) {
109 			ent[i].db_offset = DB_PF_OFFSET_P5;
110 			if (BNXT_VF(bp))
111 				ent[i].db_offset = DB_VF_OFFSET_P5;
112 		} else {
113 			ent[i].db_offset = (idx + i) * 0x80;
114 		}
115 	}
116 }
117 
bnxt_req_msix_vecs(struct bnxt_en_dev * edev,unsigned int ulp_id,struct bnxt_msix_entry * ent,int num_msix)118 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, unsigned int ulp_id,
119 			      struct bnxt_msix_entry *ent, int num_msix)
120 {
121 	struct net_device *dev = edev->net;
122 	struct bnxt *bp = netdev_priv(dev);
123 	struct bnxt_hw_resc *hw_resc;
124 	int max_idx, max_cp_rings;
125 	int avail_msix, idx;
126 	int total_vecs;
127 	int rc = 0;
128 
129 	ASSERT_RTNL();
130 	if (ulp_id != BNXT_ROCE_ULP)
131 		return -EINVAL;
132 
133 	if (!(bp->flags & BNXT_FLAG_USING_MSIX))
134 		return -ENODEV;
135 
136 	if (edev->ulp_tbl[ulp_id].msix_requested)
137 		return -EAGAIN;
138 
139 	max_cp_rings = bnxt_get_max_func_cp_rings(bp);
140 	avail_msix = bnxt_get_avail_msix(bp, num_msix);
141 	if (!avail_msix)
142 		return -ENOMEM;
143 	if (avail_msix > num_msix)
144 		avail_msix = num_msix;
145 
146 	if (BNXT_NEW_RM(bp)) {
147 		idx = bp->cp_nr_rings;
148 	} else {
149 		max_idx = min_t(int, bp->total_irqs, max_cp_rings);
150 		idx = max_idx - avail_msix;
151 	}
152 	edev->ulp_tbl[ulp_id].msix_base = idx;
153 	edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
154 	hw_resc = &bp->hw_resc;
155 	total_vecs = idx + avail_msix;
156 	if (bp->total_irqs < total_vecs ||
157 	    (BNXT_NEW_RM(bp) && hw_resc->resv_irqs < total_vecs)) {
158 		if (netif_running(dev)) {
159 			bnxt_close_nic(bp, true, false);
160 			rc = bnxt_open_nic(bp, true, false);
161 		} else {
162 			rc = bnxt_reserve_rings(bp, true);
163 		}
164 	}
165 	if (rc) {
166 		edev->ulp_tbl[ulp_id].msix_requested = 0;
167 		return -EAGAIN;
168 	}
169 
170 	if (BNXT_NEW_RM(bp)) {
171 		int resv_msix;
172 
173 		resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings;
174 		avail_msix = min_t(int, resv_msix, avail_msix);
175 		edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
176 	}
177 	bnxt_fill_msix_vecs(bp, ent);
178 	edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
179 	return avail_msix;
180 }
181 
bnxt_free_msix_vecs(struct bnxt_en_dev * edev,unsigned int ulp_id)182 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, unsigned int ulp_id)
183 {
184 	struct net_device *dev = edev->net;
185 	struct bnxt *bp = netdev_priv(dev);
186 
187 	ASSERT_RTNL();
188 	if (ulp_id != BNXT_ROCE_ULP)
189 		return -EINVAL;
190 
191 	if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
192 		return 0;
193 
194 	edev->ulp_tbl[ulp_id].msix_requested = 0;
195 	edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
196 	if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) {
197 		bnxt_close_nic(bp, true, false);
198 		bnxt_open_nic(bp, true, false);
199 	}
200 	return 0;
201 }
202 
bnxt_get_ulp_msix_num(struct bnxt * bp)203 int bnxt_get_ulp_msix_num(struct bnxt *bp)
204 {
205 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
206 		struct bnxt_en_dev *edev = bp->edev;
207 
208 		return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
209 	}
210 	return 0;
211 }
212 
bnxt_get_ulp_msix_base(struct bnxt * bp)213 int bnxt_get_ulp_msix_base(struct bnxt *bp)
214 {
215 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
216 		struct bnxt_en_dev *edev = bp->edev;
217 
218 		if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
219 			return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
220 	}
221 	return 0;
222 }
223 
bnxt_get_ulp_stat_ctxs(struct bnxt * bp)224 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
225 {
226 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
227 		struct bnxt_en_dev *edev = bp->edev;
228 
229 		if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
230 			return BNXT_MIN_ROCE_STAT_CTXS;
231 	}
232 
233 	return 0;
234 }
235 
bnxt_send_msg(struct bnxt_en_dev * edev,unsigned int ulp_id,struct bnxt_fw_msg * fw_msg)236 static int bnxt_send_msg(struct bnxt_en_dev *edev, unsigned int ulp_id,
237 			 struct bnxt_fw_msg *fw_msg)
238 {
239 	struct net_device *dev = edev->net;
240 	struct bnxt *bp = netdev_priv(dev);
241 	struct output *resp;
242 	struct input *req;
243 	u32 resp_len;
244 	int rc;
245 
246 	if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state)
247 		return -EBUSY;
248 
249 	rc = hwrm_req_init(bp, req, 0 /* don't care */);
250 	if (rc)
251 		return rc;
252 
253 	rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len);
254 	if (rc)
255 		return rc;
256 
257 	hwrm_req_timeout(bp, req, fw_msg->timeout);
258 	resp = hwrm_req_hold(bp, req);
259 	rc = hwrm_req_send(bp, req);
260 	resp_len = le16_to_cpu(resp->resp_len);
261 	if (resp_len) {
262 		if (fw_msg->resp_max_len < resp_len)
263 			resp_len = fw_msg->resp_max_len;
264 
265 		memcpy(fw_msg->resp, resp, resp_len);
266 	}
267 	hwrm_req_drop(bp, req);
268 	return rc;
269 }
270 
bnxt_ulp_get(struct bnxt_ulp * ulp)271 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
272 {
273 	atomic_inc(&ulp->ref_count);
274 }
275 
bnxt_ulp_put(struct bnxt_ulp * ulp)276 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
277 {
278 	atomic_dec(&ulp->ref_count);
279 }
280 
bnxt_ulp_stop(struct bnxt * bp)281 void bnxt_ulp_stop(struct bnxt *bp)
282 {
283 	struct bnxt_en_dev *edev = bp->edev;
284 	struct bnxt_ulp_ops *ops;
285 	int i;
286 
287 	if (!edev)
288 		return;
289 
290 	edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
291 	for (i = 0; i < BNXT_MAX_ULP; i++) {
292 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
293 
294 		ops = rtnl_dereference(ulp->ulp_ops);
295 		if (!ops || !ops->ulp_stop)
296 			continue;
297 		ops->ulp_stop(ulp->handle);
298 	}
299 }
300 
bnxt_ulp_start(struct bnxt * bp,int err)301 void bnxt_ulp_start(struct bnxt *bp, int err)
302 {
303 	struct bnxt_en_dev *edev = bp->edev;
304 	struct bnxt_ulp_ops *ops;
305 	int i;
306 
307 	if (!edev)
308 		return;
309 
310 	edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
311 
312 	if (err)
313 		return;
314 
315 	for (i = 0; i < BNXT_MAX_ULP; i++) {
316 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
317 
318 		ops = rtnl_dereference(ulp->ulp_ops);
319 		if (!ops || !ops->ulp_start)
320 			continue;
321 		ops->ulp_start(ulp->handle);
322 	}
323 }
324 
bnxt_ulp_sriov_cfg(struct bnxt * bp,int num_vfs)325 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
326 {
327 	struct bnxt_en_dev *edev = bp->edev;
328 	struct bnxt_ulp_ops *ops;
329 	int i;
330 
331 	if (!edev)
332 		return;
333 
334 	for (i = 0; i < BNXT_MAX_ULP; i++) {
335 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
336 
337 		rcu_read_lock();
338 		ops = rcu_dereference(ulp->ulp_ops);
339 		if (!ops || !ops->ulp_sriov_config) {
340 			rcu_read_unlock();
341 			continue;
342 		}
343 		bnxt_ulp_get(ulp);
344 		rcu_read_unlock();
345 		ops->ulp_sriov_config(ulp->handle, num_vfs);
346 		bnxt_ulp_put(ulp);
347 	}
348 }
349 
bnxt_ulp_shutdown(struct bnxt * bp)350 void bnxt_ulp_shutdown(struct bnxt *bp)
351 {
352 	struct bnxt_en_dev *edev = bp->edev;
353 	struct bnxt_ulp_ops *ops;
354 	int i;
355 
356 	if (!edev)
357 		return;
358 
359 	for (i = 0; i < BNXT_MAX_ULP; i++) {
360 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
361 
362 		ops = rtnl_dereference(ulp->ulp_ops);
363 		if (!ops || !ops->ulp_shutdown)
364 			continue;
365 		ops->ulp_shutdown(ulp->handle);
366 	}
367 }
368 
bnxt_ulp_irq_stop(struct bnxt * bp)369 void bnxt_ulp_irq_stop(struct bnxt *bp)
370 {
371 	struct bnxt_en_dev *edev = bp->edev;
372 	struct bnxt_ulp_ops *ops;
373 
374 	if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
375 		return;
376 
377 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
378 		struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
379 
380 		if (!ulp->msix_requested)
381 			return;
382 
383 		ops = rtnl_dereference(ulp->ulp_ops);
384 		if (!ops || !ops->ulp_irq_stop)
385 			return;
386 		ops->ulp_irq_stop(ulp->handle);
387 	}
388 }
389 
bnxt_ulp_irq_restart(struct bnxt * bp,int err)390 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
391 {
392 	struct bnxt_en_dev *edev = bp->edev;
393 	struct bnxt_ulp_ops *ops;
394 
395 	if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
396 		return;
397 
398 	if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
399 		struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
400 		struct bnxt_msix_entry *ent = NULL;
401 
402 		if (!ulp->msix_requested)
403 			return;
404 
405 		ops = rtnl_dereference(ulp->ulp_ops);
406 		if (!ops || !ops->ulp_irq_restart)
407 			return;
408 
409 		if (!err) {
410 			ent = kcalloc(ulp->msix_requested, sizeof(*ent),
411 				      GFP_KERNEL);
412 			if (!ent)
413 				return;
414 			bnxt_fill_msix_vecs(bp, ent);
415 		}
416 		ops->ulp_irq_restart(ulp->handle, ent);
417 		kfree(ent);
418 	}
419 }
420 
bnxt_ulp_async_events(struct bnxt * bp,struct hwrm_async_event_cmpl * cmpl)421 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
422 {
423 	u16 event_id = le16_to_cpu(cmpl->event_id);
424 	struct bnxt_en_dev *edev = bp->edev;
425 	struct bnxt_ulp_ops *ops;
426 	int i;
427 
428 	if (!edev)
429 		return;
430 
431 	rcu_read_lock();
432 	for (i = 0; i < BNXT_MAX_ULP; i++) {
433 		struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
434 
435 		ops = rcu_dereference(ulp->ulp_ops);
436 		if (!ops || !ops->ulp_async_notifier)
437 			continue;
438 		if (!ulp->async_events_bmap ||
439 		    event_id > ulp->max_async_event_id)
440 			continue;
441 
442 		/* Read max_async_event_id first before testing the bitmap. */
443 		smp_rmb();
444 		if (test_bit(event_id, ulp->async_events_bmap))
445 			ops->ulp_async_notifier(ulp->handle, cmpl);
446 	}
447 	rcu_read_unlock();
448 }
449 
bnxt_register_async_events(struct bnxt_en_dev * edev,unsigned int ulp_id,unsigned long * events_bmap,u16 max_id)450 static int bnxt_register_async_events(struct bnxt_en_dev *edev, unsigned int ulp_id,
451 				      unsigned long *events_bmap, u16 max_id)
452 {
453 	struct net_device *dev = edev->net;
454 	struct bnxt *bp = netdev_priv(dev);
455 	struct bnxt_ulp *ulp;
456 
457 	if (ulp_id >= BNXT_MAX_ULP)
458 		return -EINVAL;
459 
460 	ulp = &edev->ulp_tbl[ulp_id];
461 	ulp->async_events_bmap = events_bmap;
462 	/* Make sure bnxt_ulp_async_events() sees this order */
463 	smp_wmb();
464 	ulp->max_async_event_id = max_id;
465 	bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
466 	return 0;
467 }
468 
469 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
470 	.bnxt_register_device	= bnxt_register_dev,
471 	.bnxt_unregister_device	= bnxt_unregister_dev,
472 	.bnxt_request_msix	= bnxt_req_msix_vecs,
473 	.bnxt_free_msix		= bnxt_free_msix_vecs,
474 	.bnxt_send_fw_msg	= bnxt_send_msg,
475 	.bnxt_register_fw_async_events	= bnxt_register_async_events,
476 };
477 
bnxt_ulp_probe(struct net_device * dev)478 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
479 {
480 	struct bnxt *bp = netdev_priv(dev);
481 	struct bnxt_en_dev *edev;
482 
483 	edev = bp->edev;
484 	if (!edev) {
485 		edev = kzalloc(sizeof(*edev), GFP_KERNEL);
486 		if (!edev)
487 			return ERR_PTR(-ENOMEM);
488 		edev->en_ops = &bnxt_en_ops_tbl;
489 		edev->net = dev;
490 		edev->pdev = bp->pdev;
491 		edev->l2_db_size = bp->db_size;
492 		edev->l2_db_size_nc = bp->db_size;
493 		bp->edev = edev;
494 	}
495 	edev->flags &= ~BNXT_EN_FLAG_ROCE_CAP;
496 	if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
497 		edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
498 	if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
499 		edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
500 	return bp->edev;
501 }
502 EXPORT_SYMBOL(bnxt_ulp_probe);
503