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
29 static DEFINE_IDA(bnxt_aux_dev_ids);
30
bnxt_fill_msix_vecs(struct bnxt * bp,struct bnxt_msix_entry * ent)31 static 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, 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 for (i = 0; i < num_msix; i++) {
42 ent[i].vector = bp->irq_tbl[i].vector;
43 ent[i].ring_idx = i;
44 if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
45 ent[i].db_offset = bp->db_offset;
46 else
47 ent[i].db_offset = i * 0x80;
48 }
49 }
50
bnxt_get_ulp_msix_num(struct bnxt * bp)51 int bnxt_get_ulp_msix_num(struct bnxt *bp)
52 {
53 if (bp->edev)
54 return bp->edev->ulp_num_msix_vec;
55 return 0;
56 }
57
bnxt_set_ulp_msix_num(struct bnxt * bp,int num)58 void bnxt_set_ulp_msix_num(struct bnxt *bp, int num)
59 {
60 if (bp->edev)
61 bp->edev->ulp_num_msix_vec = num;
62 }
63
bnxt_get_ulp_msix_num_in_use(struct bnxt * bp)64 int bnxt_get_ulp_msix_num_in_use(struct bnxt *bp)
65 {
66 if (bnxt_ulp_registered(bp->edev))
67 return bp->edev->ulp_num_msix_vec;
68 return 0;
69 }
70
bnxt_get_ulp_stat_ctxs(struct bnxt * bp)71 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
72 {
73 if (bp->edev)
74 return bp->edev->ulp_num_ctxs;
75 return 0;
76 }
77
bnxt_set_ulp_stat_ctxs(struct bnxt * bp,int num_ulp_ctx)78 void bnxt_set_ulp_stat_ctxs(struct bnxt *bp, int num_ulp_ctx)
79 {
80 if (bp->edev)
81 bp->edev->ulp_num_ctxs = num_ulp_ctx;
82 }
83
bnxt_get_ulp_stat_ctxs_in_use(struct bnxt * bp)84 int bnxt_get_ulp_stat_ctxs_in_use(struct bnxt *bp)
85 {
86 if (bnxt_ulp_registered(bp->edev))
87 return bp->edev->ulp_num_ctxs;
88 return 0;
89 }
90
bnxt_set_dflt_ulp_stat_ctxs(struct bnxt * bp)91 void bnxt_set_dflt_ulp_stat_ctxs(struct bnxt *bp)
92 {
93 if (bp->edev) {
94 bp->edev->ulp_num_ctxs = BNXT_MIN_ROCE_STAT_CTXS;
95 /* Reserve one additional stat_ctx for PF0 (except
96 * on 1-port NICs) as it also creates one stat_ctx
97 * for PF1 in case of RoCE bonding.
98 */
99 if (BNXT_PF(bp) && !bp->pf.port_id &&
100 bp->port_count > 1)
101 bp->edev->ulp_num_ctxs++;
102 }
103 }
104
bnxt_register_dev(struct bnxt_en_dev * edev,struct bnxt_ulp_ops * ulp_ops,void * handle)105 int bnxt_register_dev(struct bnxt_en_dev *edev,
106 struct bnxt_ulp_ops *ulp_ops,
107 void *handle)
108 {
109 struct net_device *dev = edev->net;
110 struct bnxt *bp = netdev_priv(dev);
111 unsigned int max_stat_ctxs;
112 struct bnxt_ulp *ulp;
113 int rc = 0;
114
115 rtnl_lock();
116 mutex_lock(&edev->en_dev_lock);
117 if (!bp->irq_tbl) {
118 rc = -ENODEV;
119 goto exit;
120 }
121 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
122 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
123 bp->cp_nr_rings == max_stat_ctxs) {
124 rc = -ENOMEM;
125 goto exit;
126 }
127
128 ulp = edev->ulp_tbl;
129 ulp->handle = handle;
130 rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
131
132 if (test_bit(BNXT_STATE_OPEN, &bp->state))
133 bnxt_hwrm_vnic_cfg(bp, &bp->vnic_info[BNXT_VNIC_DEFAULT]);
134
135 edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp);
136
137 bnxt_fill_msix_vecs(bp, bp->edev->msix_entries);
138 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
139 exit:
140 mutex_unlock(&edev->en_dev_lock);
141 rtnl_unlock();
142 return rc;
143 }
144 EXPORT_SYMBOL(bnxt_register_dev);
145
bnxt_unregister_dev(struct bnxt_en_dev * edev)146 void bnxt_unregister_dev(struct bnxt_en_dev *edev)
147 {
148 struct net_device *dev = edev->net;
149 struct bnxt *bp = netdev_priv(dev);
150 struct bnxt_ulp *ulp;
151 int i = 0;
152
153 ulp = edev->ulp_tbl;
154 rtnl_lock();
155 mutex_lock(&edev->en_dev_lock);
156 if (ulp->msix_requested)
157 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
158 edev->ulp_tbl->msix_requested = 0;
159
160 if (ulp->max_async_event_id)
161 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true);
162
163 RCU_INIT_POINTER(ulp->ulp_ops, NULL);
164 synchronize_rcu();
165 ulp->max_async_event_id = 0;
166 ulp->async_events_bmap = NULL;
167 while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
168 msleep(100);
169 i++;
170 }
171 mutex_unlock(&edev->en_dev_lock);
172 rtnl_unlock();
173 return;
174 }
175 EXPORT_SYMBOL(bnxt_unregister_dev);
176
bnxt_set_dflt_ulp_msix(struct bnxt * bp)177 static int bnxt_set_dflt_ulp_msix(struct bnxt *bp)
178 {
179 int roce_msix = BNXT_MAX_ROCE_MSIX;
180
181 if (BNXT_VF(bp))
182 roce_msix = BNXT_MAX_ROCE_MSIX_VF;
183 else if (bp->port_partition_type)
184 roce_msix = BNXT_MAX_ROCE_MSIX_NPAR_PF;
185
186 /* NQ MSIX vectors should match the number of CPUs plus 1 more for
187 * the CREQ MSIX, up to the default.
188 */
189 return min_t(int, roce_msix, num_online_cpus() + 1);
190 }
191
bnxt_send_msg(struct bnxt_en_dev * edev,struct bnxt_fw_msg * fw_msg)192 int bnxt_send_msg(struct bnxt_en_dev *edev,
193 struct bnxt_fw_msg *fw_msg)
194 {
195 struct net_device *dev = edev->net;
196 struct bnxt *bp = netdev_priv(dev);
197 struct output *resp;
198 struct input *req;
199 u32 resp_len;
200 int rc;
201
202 if (bp->fw_reset_state)
203 return -EBUSY;
204
205 rc = hwrm_req_init(bp, req, 0 /* don't care */);
206 if (rc)
207 return rc;
208
209 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len);
210 if (rc)
211 return rc;
212
213 hwrm_req_timeout(bp, req, fw_msg->timeout);
214 resp = hwrm_req_hold(bp, req);
215 rc = hwrm_req_send(bp, req);
216 resp_len = le16_to_cpu(resp->resp_len);
217 if (resp_len) {
218 if (fw_msg->resp_max_len < resp_len)
219 resp_len = fw_msg->resp_max_len;
220
221 memcpy(fw_msg->resp, resp, resp_len);
222 }
223 hwrm_req_drop(bp, req);
224 return rc;
225 }
226 EXPORT_SYMBOL(bnxt_send_msg);
227
bnxt_ulp_stop(struct bnxt * bp)228 void bnxt_ulp_stop(struct bnxt *bp)
229 {
230 struct bnxt_aux_priv *aux_priv = bp->aux_priv;
231 struct bnxt_en_dev *edev = bp->edev;
232
233 if (!edev)
234 return;
235
236 mutex_lock(&edev->en_dev_lock);
237 if (!bnxt_ulp_registered(edev)) {
238 mutex_unlock(&edev->en_dev_lock);
239 return;
240 }
241
242 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
243 if (aux_priv) {
244 struct auxiliary_device *adev;
245
246 adev = &aux_priv->aux_dev;
247 if (adev->dev.driver) {
248 const struct auxiliary_driver *adrv;
249 pm_message_t pm = {};
250
251 adrv = to_auxiliary_drv(adev->dev.driver);
252 edev->en_state = bp->state;
253 adrv->suspend(adev, pm);
254 }
255 }
256 mutex_unlock(&edev->en_dev_lock);
257 }
258
bnxt_ulp_start(struct bnxt * bp,int err)259 void bnxt_ulp_start(struct bnxt *bp, int err)
260 {
261 struct bnxt_aux_priv *aux_priv = bp->aux_priv;
262 struct bnxt_en_dev *edev = bp->edev;
263
264 if (!edev)
265 return;
266
267 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
268
269 if (err)
270 return;
271
272 mutex_lock(&edev->en_dev_lock);
273 if (!bnxt_ulp_registered(edev)) {
274 mutex_unlock(&edev->en_dev_lock);
275 return;
276 }
277
278 if (edev->ulp_tbl->msix_requested)
279 bnxt_fill_msix_vecs(bp, edev->msix_entries);
280
281 if (aux_priv) {
282 struct auxiliary_device *adev;
283
284 adev = &aux_priv->aux_dev;
285 if (adev->dev.driver) {
286 const struct auxiliary_driver *adrv;
287
288 adrv = to_auxiliary_drv(adev->dev.driver);
289 edev->en_state = bp->state;
290 adrv->resume(adev);
291 }
292 }
293 mutex_unlock(&edev->en_dev_lock);
294 }
295
bnxt_ulp_irq_stop(struct bnxt * bp)296 void bnxt_ulp_irq_stop(struct bnxt *bp)
297 {
298 struct bnxt_en_dev *edev = bp->edev;
299 struct bnxt_ulp_ops *ops;
300
301 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
302 return;
303
304 if (bnxt_ulp_registered(bp->edev)) {
305 struct bnxt_ulp *ulp = edev->ulp_tbl;
306
307 if (!ulp->msix_requested)
308 return;
309
310 ops = rtnl_dereference(ulp->ulp_ops);
311 if (!ops || !ops->ulp_irq_stop)
312 return;
313 ops->ulp_irq_stop(ulp->handle);
314 }
315 }
316
bnxt_ulp_irq_restart(struct bnxt * bp,int err)317 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
318 {
319 struct bnxt_en_dev *edev = bp->edev;
320 struct bnxt_ulp_ops *ops;
321
322 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
323 return;
324
325 if (bnxt_ulp_registered(bp->edev)) {
326 struct bnxt_ulp *ulp = edev->ulp_tbl;
327 struct bnxt_msix_entry *ent = NULL;
328
329 if (!ulp->msix_requested)
330 return;
331
332 ops = rtnl_dereference(ulp->ulp_ops);
333 if (!ops || !ops->ulp_irq_restart)
334 return;
335
336 if (!err) {
337 ent = kcalloc(ulp->msix_requested, sizeof(*ent),
338 GFP_KERNEL);
339 if (!ent)
340 return;
341 bnxt_fill_msix_vecs(bp, ent);
342 }
343 ops->ulp_irq_restart(ulp->handle, ent);
344 kfree(ent);
345 }
346 }
347
bnxt_register_async_events(struct bnxt_en_dev * edev,unsigned long * events_bmap,u16 max_id)348 int bnxt_register_async_events(struct bnxt_en_dev *edev,
349 unsigned long *events_bmap,
350 u16 max_id)
351 {
352 struct net_device *dev = edev->net;
353 struct bnxt *bp = netdev_priv(dev);
354 struct bnxt_ulp *ulp;
355
356 ulp = edev->ulp_tbl;
357 ulp->async_events_bmap = events_bmap;
358 /* Make sure bnxt_ulp_async_events() sees this order */
359 smp_wmb();
360 ulp->max_async_event_id = max_id;
361 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
362 return 0;
363 }
364 EXPORT_SYMBOL(bnxt_register_async_events);
365
bnxt_rdma_aux_device_uninit(struct bnxt * bp)366 void bnxt_rdma_aux_device_uninit(struct bnxt *bp)
367 {
368 struct bnxt_aux_priv *aux_priv;
369 struct auxiliary_device *adev;
370
371 /* Skip if no auxiliary device init was done. */
372 if (!bp->aux_priv)
373 return;
374
375 aux_priv = bp->aux_priv;
376 adev = &aux_priv->aux_dev;
377 auxiliary_device_uninit(adev);
378 }
379
bnxt_aux_dev_release(struct device * dev)380 static void bnxt_aux_dev_release(struct device *dev)
381 {
382 struct bnxt_aux_priv *aux_priv =
383 container_of(dev, struct bnxt_aux_priv, aux_dev.dev);
384 struct bnxt *bp = netdev_priv(aux_priv->edev->net);
385
386 ida_free(&bnxt_aux_dev_ids, aux_priv->id);
387 kfree(aux_priv->edev->ulp_tbl);
388 bp->edev = NULL;
389 kfree(aux_priv->edev);
390 kfree(aux_priv);
391 bp->aux_priv = NULL;
392 }
393
bnxt_rdma_aux_device_del(struct bnxt * bp)394 void bnxt_rdma_aux_device_del(struct bnxt *bp)
395 {
396 if (!bp->edev)
397 return;
398
399 auxiliary_device_delete(&bp->aux_priv->aux_dev);
400 }
401
bnxt_set_edev_info(struct bnxt_en_dev * edev,struct bnxt * bp)402 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp)
403 {
404 edev->net = bp->dev;
405 edev->pdev = bp->pdev;
406 edev->l2_db_size = bp->db_size;
407 edev->l2_db_size_nc = bp->db_size;
408 edev->l2_db_offset = bp->db_offset;
409 mutex_init(&edev->en_dev_lock);
410
411 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
412 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
413 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
414 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
415 if (bp->flags & BNXT_FLAG_VF)
416 edev->flags |= BNXT_EN_FLAG_VF;
417
418 edev->chip_num = bp->chip_num;
419 edev->hw_ring_stats_size = bp->hw_ring_stats_size;
420 edev->pf_port_id = bp->pf.port_id;
421 edev->en_state = bp->state;
422 edev->bar0 = bp->bar0;
423 }
424
bnxt_rdma_aux_device_add(struct bnxt * bp)425 void bnxt_rdma_aux_device_add(struct bnxt *bp)
426 {
427 struct auxiliary_device *aux_dev;
428 int rc;
429
430 if (!bp->edev)
431 return;
432
433 aux_dev = &bp->aux_priv->aux_dev;
434 rc = auxiliary_device_add(aux_dev);
435 if (rc) {
436 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n");
437 auxiliary_device_uninit(aux_dev);
438 bp->flags &= ~BNXT_FLAG_ROCE_CAP;
439 }
440 }
441
bnxt_rdma_aux_device_init(struct bnxt * bp)442 void bnxt_rdma_aux_device_init(struct bnxt *bp)
443 {
444 struct auxiliary_device *aux_dev;
445 struct bnxt_aux_priv *aux_priv;
446 struct bnxt_en_dev *edev;
447 struct bnxt_ulp *ulp;
448 int rc;
449
450 if (!(bp->flags & BNXT_FLAG_ROCE_CAP))
451 return;
452
453 aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL);
454 if (!aux_priv)
455 goto exit;
456
457 aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL);
458 if (aux_priv->id < 0) {
459 netdev_warn(bp->dev,
460 "ida alloc failed for ROCE auxiliary device\n");
461 kfree(aux_priv);
462 goto exit;
463 }
464
465 aux_dev = &aux_priv->aux_dev;
466 aux_dev->id = aux_priv->id;
467 aux_dev->name = "rdma";
468 aux_dev->dev.parent = &bp->pdev->dev;
469 aux_dev->dev.release = bnxt_aux_dev_release;
470
471 rc = auxiliary_device_init(aux_dev);
472 if (rc) {
473 ida_free(&bnxt_aux_dev_ids, aux_priv->id);
474 kfree(aux_priv);
475 goto exit;
476 }
477 bp->aux_priv = aux_priv;
478
479 /* From this point, all cleanup will happen via the .release callback &
480 * any error unwinding will need to include a call to
481 * auxiliary_device_uninit.
482 */
483 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
484 if (!edev)
485 goto aux_dev_uninit;
486
487 aux_priv->edev = edev;
488
489 ulp = kzalloc(sizeof(*ulp), GFP_KERNEL);
490 if (!ulp)
491 goto aux_dev_uninit;
492
493 edev->ulp_tbl = ulp;
494 bp->edev = edev;
495 bnxt_set_edev_info(edev, bp);
496 bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp);
497
498 return;
499
500 aux_dev_uninit:
501 auxiliary_device_uninit(aux_dev);
502 exit:
503 bp->flags &= ~BNXT_FLAG_ROCE_CAP;
504 }
505