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#include <linux/auxiliary_bus.h>
23
24#include "bnxt_hsi.h"
25#include "bnxt.h"
26#include "bnxt_hwrm.h"
27#include "bnxt_ulp.h"
28
29static DEFINE_IDA(bnxt_aux_dev_ids);
30
31static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
32{
33	struct bnxt_en_dev *edev = bp->edev;
34	int num_msix, idx, i;
35
36	if (!edev->ulp_tbl->msix_requested) {
37		netdev_warn(bp->dev, "Requested MSI-X vectors insufficient\n");
38		return;
39	}
40	num_msix = edev->ulp_tbl->msix_requested;
41	idx = edev->ulp_tbl->msix_base;
42	for (i = 0; i < num_msix; i++) {
43		ent[i].vector = bp->irq_tbl[idx + i].vector;
44		ent[i].ring_idx = idx + i;
45		if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
46			ent[i].db_offset = bp->db_offset;
47		else
48			ent[i].db_offset = (idx + i) * 0x80;
49	}
50}
51
52int bnxt_register_dev(struct bnxt_en_dev *edev,
53		      struct bnxt_ulp_ops *ulp_ops,
54		      void *handle)
55{
56	struct net_device *dev = edev->net;
57	struct bnxt *bp = netdev_priv(dev);
58	unsigned int max_stat_ctxs;
59	struct bnxt_ulp *ulp;
60
61	max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
62	if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
63	    bp->cp_nr_rings == max_stat_ctxs)
64		return -ENOMEM;
65
66	ulp = edev->ulp_tbl;
67	if (!ulp)
68		return -ENOMEM;
69
70	ulp->handle = handle;
71	rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
72
73	if (test_bit(BNXT_STATE_OPEN, &bp->state))
74		bnxt_hwrm_vnic_cfg(bp, 0);
75
76	bnxt_fill_msix_vecs(bp, bp->edev->msix_entries);
77	edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
78	return 0;
79}
80EXPORT_SYMBOL(bnxt_register_dev);
81
82void bnxt_unregister_dev(struct bnxt_en_dev *edev)
83{
84	struct net_device *dev = edev->net;
85	struct bnxt *bp = netdev_priv(dev);
86	struct bnxt_ulp *ulp;
87	int i = 0;
88
89	ulp = edev->ulp_tbl;
90	if (ulp->msix_requested)
91		edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
92
93	if (ulp->max_async_event_id)
94		bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true);
95
96	RCU_INIT_POINTER(ulp->ulp_ops, NULL);
97	synchronize_rcu();
98	ulp->max_async_event_id = 0;
99	ulp->async_events_bmap = NULL;
100	while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
101		msleep(100);
102		i++;
103	}
104	return;
105}
106EXPORT_SYMBOL(bnxt_unregister_dev);
107
108int bnxt_get_ulp_msix_num(struct bnxt *bp)
109{
110	u32 roce_msix = BNXT_VF(bp) ?
111			BNXT_MAX_VF_ROCE_MSIX : BNXT_MAX_ROCE_MSIX;
112
113	return ((bp->flags & BNXT_FLAG_ROCE_CAP) ?
114		min_t(u32, roce_msix, num_online_cpus()) : 0);
115}
116
117int bnxt_get_ulp_msix_base(struct bnxt *bp)
118{
119	if (bnxt_ulp_registered(bp->edev)) {
120		struct bnxt_en_dev *edev = bp->edev;
121
122		if (edev->ulp_tbl->msix_requested)
123			return edev->ulp_tbl->msix_base;
124	}
125	return 0;
126}
127
128int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
129{
130	if (bnxt_ulp_registered(bp->edev)) {
131		struct bnxt_en_dev *edev = bp->edev;
132
133		if (edev->ulp_tbl->msix_requested)
134			return BNXT_MIN_ROCE_STAT_CTXS;
135	}
136
137	return 0;
138}
139
140int bnxt_send_msg(struct bnxt_en_dev *edev,
141			 struct bnxt_fw_msg *fw_msg)
142{
143	struct net_device *dev = edev->net;
144	struct bnxt *bp = netdev_priv(dev);
145	struct output *resp;
146	struct input *req;
147	u32 resp_len;
148	int rc;
149
150	if (bp->fw_reset_state)
151		return -EBUSY;
152
153	rc = hwrm_req_init(bp, req, 0 /* don't care */);
154	if (rc)
155		return rc;
156
157	rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len);
158	if (rc)
159		return rc;
160
161	hwrm_req_timeout(bp, req, fw_msg->timeout);
162	resp = hwrm_req_hold(bp, req);
163	rc = hwrm_req_send(bp, req);
164	resp_len = le16_to_cpu(resp->resp_len);
165	if (resp_len) {
166		if (fw_msg->resp_max_len < resp_len)
167			resp_len = fw_msg->resp_max_len;
168
169		memcpy(fw_msg->resp, resp, resp_len);
170	}
171	hwrm_req_drop(bp, req);
172	return rc;
173}
174EXPORT_SYMBOL(bnxt_send_msg);
175
176void bnxt_ulp_stop(struct bnxt *bp)
177{
178	struct bnxt_aux_priv *aux_priv = bp->aux_priv;
179	struct bnxt_en_dev *edev = bp->edev;
180
181	if (!edev)
182		return;
183
184	edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
185	if (aux_priv) {
186		struct auxiliary_device *adev;
187
188		adev = &aux_priv->aux_dev;
189		if (adev->dev.driver) {
190			struct auxiliary_driver *adrv;
191			pm_message_t pm = {};
192
193			adrv = to_auxiliary_drv(adev->dev.driver);
194			edev->en_state = bp->state;
195			adrv->suspend(adev, pm);
196		}
197	}
198}
199
200void bnxt_ulp_start(struct bnxt *bp, int err)
201{
202	struct bnxt_aux_priv *aux_priv = bp->aux_priv;
203	struct bnxt_en_dev *edev = bp->edev;
204
205	if (!edev)
206		return;
207
208	edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
209
210	if (err)
211		return;
212
213	if (edev->ulp_tbl->msix_requested)
214		bnxt_fill_msix_vecs(bp, edev->msix_entries);
215
216	if (aux_priv) {
217		struct auxiliary_device *adev;
218
219		adev = &aux_priv->aux_dev;
220		if (adev->dev.driver) {
221			struct auxiliary_driver *adrv;
222
223			adrv = to_auxiliary_drv(adev->dev.driver);
224			edev->en_state = bp->state;
225			adrv->resume(adev);
226		}
227	}
228
229}
230
231void bnxt_ulp_irq_stop(struct bnxt *bp)
232{
233	struct bnxt_en_dev *edev = bp->edev;
234	struct bnxt_ulp_ops *ops;
235
236	if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
237		return;
238
239	if (bnxt_ulp_registered(bp->edev)) {
240		struct bnxt_ulp *ulp = edev->ulp_tbl;
241
242		if (!ulp->msix_requested)
243			return;
244
245		ops = rtnl_dereference(ulp->ulp_ops);
246		if (!ops || !ops->ulp_irq_stop)
247			return;
248		ops->ulp_irq_stop(ulp->handle);
249	}
250}
251
252void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
253{
254	struct bnxt_en_dev *edev = bp->edev;
255	struct bnxt_ulp_ops *ops;
256
257	if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
258		return;
259
260	if (bnxt_ulp_registered(bp->edev)) {
261		struct bnxt_ulp *ulp = edev->ulp_tbl;
262		struct bnxt_msix_entry *ent = NULL;
263
264		if (!ulp->msix_requested)
265			return;
266
267		ops = rtnl_dereference(ulp->ulp_ops);
268		if (!ops || !ops->ulp_irq_restart)
269			return;
270
271		if (!err) {
272			ent = kcalloc(ulp->msix_requested, sizeof(*ent),
273				      GFP_KERNEL);
274			if (!ent)
275				return;
276			bnxt_fill_msix_vecs(bp, ent);
277		}
278		ops->ulp_irq_restart(ulp->handle, ent);
279		kfree(ent);
280	}
281}
282
283int bnxt_register_async_events(struct bnxt_en_dev *edev,
284			       unsigned long *events_bmap,
285			       u16 max_id)
286{
287	struct net_device *dev = edev->net;
288	struct bnxt *bp = netdev_priv(dev);
289	struct bnxt_ulp *ulp;
290
291	ulp = edev->ulp_tbl;
292	ulp->async_events_bmap = events_bmap;
293	/* Make sure bnxt_ulp_async_events() sees this order */
294	smp_wmb();
295	ulp->max_async_event_id = max_id;
296	bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
297	return 0;
298}
299EXPORT_SYMBOL(bnxt_register_async_events);
300
301void bnxt_rdma_aux_device_uninit(struct bnxt *bp)
302{
303	struct bnxt_aux_priv *aux_priv;
304	struct auxiliary_device *adev;
305
306	/* Skip if no auxiliary device init was done. */
307	if (!bp->aux_priv)
308		return;
309
310	aux_priv = bp->aux_priv;
311	adev = &aux_priv->aux_dev;
312	auxiliary_device_delete(adev);
313	auxiliary_device_uninit(adev);
314}
315
316static void bnxt_aux_dev_release(struct device *dev)
317{
318	struct bnxt_aux_priv *aux_priv =
319		container_of(dev, struct bnxt_aux_priv, aux_dev.dev);
320	struct bnxt *bp = netdev_priv(aux_priv->edev->net);
321
322	ida_free(&bnxt_aux_dev_ids, aux_priv->id);
323	kfree(aux_priv->edev->ulp_tbl);
324	bp->edev = NULL;
325	kfree(aux_priv->edev);
326	kfree(aux_priv);
327	bp->aux_priv = NULL;
328}
329
330static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp)
331{
332	edev->net = bp->dev;
333	edev->pdev = bp->pdev;
334	edev->l2_db_size = bp->db_size;
335	edev->l2_db_size_nc = bp->db_size;
336	edev->l2_db_offset = bp->db_offset;
337
338	if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
339		edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
340	if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
341		edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
342	if (bp->flags & BNXT_FLAG_VF)
343		edev->flags |= BNXT_EN_FLAG_VF;
344
345	edev->chip_num = bp->chip_num;
346	edev->hw_ring_stats_size = bp->hw_ring_stats_size;
347	edev->pf_port_id = bp->pf.port_id;
348	edev->en_state = bp->state;
349	edev->bar0 = bp->bar0;
350	edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp);
351}
352
353void bnxt_rdma_aux_device_init(struct bnxt *bp)
354{
355	struct auxiliary_device *aux_dev;
356	struct bnxt_aux_priv *aux_priv;
357	struct bnxt_en_dev *edev;
358	struct bnxt_ulp *ulp;
359	int rc;
360
361	if (!(bp->flags & BNXT_FLAG_ROCE_CAP))
362		return;
363
364	aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL);
365	if (!aux_priv)
366		goto exit;
367
368	aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL);
369	if (aux_priv->id < 0) {
370		netdev_warn(bp->dev,
371			    "ida alloc failed for ROCE auxiliary device\n");
372		kfree(aux_priv);
373		goto exit;
374	}
375
376	aux_dev = &aux_priv->aux_dev;
377	aux_dev->id = aux_priv->id;
378	aux_dev->name = "rdma";
379	aux_dev->dev.parent = &bp->pdev->dev;
380	aux_dev->dev.release = bnxt_aux_dev_release;
381
382	rc = auxiliary_device_init(aux_dev);
383	if (rc) {
384		ida_free(&bnxt_aux_dev_ids, aux_priv->id);
385		kfree(aux_priv);
386		goto exit;
387	}
388	bp->aux_priv = aux_priv;
389
390	/* From this point, all cleanup will happen via the .release callback &
391	 * any error unwinding will need to include a call to
392	 * auxiliary_device_uninit.
393	 */
394	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
395	if (!edev)
396		goto aux_dev_uninit;
397
398	aux_priv->edev = edev;
399
400	ulp = kzalloc(sizeof(*ulp), GFP_KERNEL);
401	if (!ulp)
402		goto aux_dev_uninit;
403
404	edev->ulp_tbl = ulp;
405	bp->edev = edev;
406	bnxt_set_edev_info(edev, bp);
407
408	rc = auxiliary_device_add(aux_dev);
409	if (rc) {
410		netdev_warn(bp->dev,
411			    "Failed to add auxiliary device for ROCE\n");
412		goto aux_dev_uninit;
413	}
414
415	return;
416
417aux_dev_uninit:
418	auxiliary_device_uninit(aux_dev);
419exit:
420	bp->flags &= ~BNXT_FLAG_ROCE_CAP;
421}
422