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_ulp.h"
26
bnxt_register_dev(struct bnxt_en_dev * edev,int ulp_id,struct bnxt_ulp_ops * ulp_ops,void * handle)27 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id,
28 struct bnxt_ulp_ops *ulp_ops, void *handle)
29 {
30 struct net_device *dev = edev->net;
31 struct bnxt *bp = netdev_priv(dev);
32 struct bnxt_ulp *ulp;
33
34 ASSERT_RTNL();
35 if (ulp_id >= BNXT_MAX_ULP)
36 return -EINVAL;
37
38 ulp = &edev->ulp_tbl[ulp_id];
39 if (rcu_access_pointer(ulp->ulp_ops)) {
40 netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id);
41 return -EBUSY;
42 }
43 if (ulp_id == BNXT_ROCE_ULP) {
44 unsigned int max_stat_ctxs;
45
46 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp);
47 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS ||
48 bp->cp_nr_rings == max_stat_ctxs)
49 return -ENOMEM;
50 }
51
52 atomic_set(&ulp->ref_count, 0);
53 ulp->handle = handle;
54 rcu_assign_pointer(ulp->ulp_ops, ulp_ops);
55
56 if (ulp_id == BNXT_ROCE_ULP) {
57 if (test_bit(BNXT_STATE_OPEN, &bp->state))
58 bnxt_hwrm_vnic_cfg(bp, 0);
59 }
60
61 return 0;
62 }
63
bnxt_unregister_dev(struct bnxt_en_dev * edev,int ulp_id)64 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
65 {
66 struct net_device *dev = edev->net;
67 struct bnxt *bp = netdev_priv(dev);
68 struct bnxt_ulp *ulp;
69 int i = 0;
70
71 ASSERT_RTNL();
72 if (ulp_id >= BNXT_MAX_ULP)
73 return -EINVAL;
74
75 ulp = &edev->ulp_tbl[ulp_id];
76 if (!rcu_access_pointer(ulp->ulp_ops)) {
77 netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id);
78 return -EINVAL;
79 }
80 if (ulp_id == BNXT_ROCE_ULP && ulp->msix_requested)
81 edev->en_ops->bnxt_free_msix(edev, ulp_id);
82
83 if (ulp->max_async_event_id)
84 bnxt_hwrm_func_rgtr_async_events(bp, NULL, 0);
85
86 RCU_INIT_POINTER(ulp->ulp_ops, NULL);
87 synchronize_rcu();
88 ulp->max_async_event_id = 0;
89 ulp->async_events_bmap = NULL;
90 while (atomic_read(&ulp->ref_count) != 0 && i < 10) {
91 msleep(100);
92 i++;
93 }
94 return 0;
95 }
96
bnxt_fill_msix_vecs(struct bnxt * bp,struct bnxt_msix_entry * ent)97 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
98 {
99 struct bnxt_en_dev *edev = bp->edev;
100 int num_msix, idx, i;
101
102 num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
103 idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
104 for (i = 0; i < num_msix; i++) {
105 ent[i].vector = bp->irq_tbl[idx + i].vector;
106 ent[i].ring_idx = idx + i;
107 ent[i].db_offset = (idx + i) * 0x80;
108 }
109 }
110
bnxt_req_msix_vecs(struct bnxt_en_dev * edev,int ulp_id,struct bnxt_msix_entry * ent,int num_msix)111 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
112 struct bnxt_msix_entry *ent, int num_msix)
113 {
114 struct net_device *dev = edev->net;
115 struct bnxt *bp = netdev_priv(dev);
116 int max_idx, max_cp_rings;
117 int avail_msix, idx;
118 int rc = 0;
119
120 ASSERT_RTNL();
121 if (ulp_id != BNXT_ROCE_ULP)
122 return -EINVAL;
123
124 if (!(bp->flags & BNXT_FLAG_USING_MSIX))
125 return -ENODEV;
126
127 if (edev->ulp_tbl[ulp_id].msix_requested)
128 return -EAGAIN;
129
130 max_cp_rings = bnxt_get_max_func_cp_rings(bp);
131 avail_msix = bnxt_get_avail_msix(bp, num_msix);
132 if (!avail_msix)
133 return -ENOMEM;
134 if (avail_msix > num_msix)
135 avail_msix = num_msix;
136
137 if (BNXT_NEW_RM(bp)) {
138 idx = bp->cp_nr_rings;
139 } else {
140 max_idx = min_t(int, bp->total_irqs, max_cp_rings);
141 idx = max_idx - avail_msix;
142 }
143 edev->ulp_tbl[ulp_id].msix_base = idx;
144 edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
145 if (bp->total_irqs < (idx + avail_msix)) {
146 if (netif_running(dev)) {
147 bnxt_close_nic(bp, true, false);
148 rc = bnxt_open_nic(bp, true, false);
149 } else {
150 rc = bnxt_reserve_rings(bp, true);
151 }
152 }
153 if (rc) {
154 edev->ulp_tbl[ulp_id].msix_requested = 0;
155 return -EAGAIN;
156 }
157
158 if (BNXT_NEW_RM(bp)) {
159 struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
160 int resv_msix;
161
162 resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings;
163 avail_msix = min_t(int, resv_msix, avail_msix);
164 edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
165 }
166 bnxt_fill_msix_vecs(bp, ent);
167 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
168 return avail_msix;
169 }
170
bnxt_free_msix_vecs(struct bnxt_en_dev * edev,int ulp_id)171 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
172 {
173 struct net_device *dev = edev->net;
174 struct bnxt *bp = netdev_priv(dev);
175
176 ASSERT_RTNL();
177 if (ulp_id != BNXT_ROCE_ULP)
178 return -EINVAL;
179
180 if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
181 return 0;
182
183 edev->ulp_tbl[ulp_id].msix_requested = 0;
184 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
185 if (netif_running(dev)) {
186 bnxt_close_nic(bp, true, false);
187 bnxt_open_nic(bp, true, false);
188 }
189 return 0;
190 }
191
bnxt_get_ulp_msix_num(struct bnxt * bp)192 int bnxt_get_ulp_msix_num(struct bnxt *bp)
193 {
194 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
195 struct bnxt_en_dev *edev = bp->edev;
196
197 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
198 }
199 return 0;
200 }
201
bnxt_get_ulp_msix_base(struct bnxt * bp)202 int bnxt_get_ulp_msix_base(struct bnxt *bp)
203 {
204 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
205 struct bnxt_en_dev *edev = bp->edev;
206
207 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
208 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
209 }
210 return 0;
211 }
212
bnxt_get_ulp_stat_ctxs(struct bnxt * bp)213 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
214 {
215 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
216 return BNXT_MIN_ROCE_STAT_CTXS;
217
218 return 0;
219 }
220
bnxt_send_msg(struct bnxt_en_dev * edev,int ulp_id,struct bnxt_fw_msg * fw_msg)221 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
222 struct bnxt_fw_msg *fw_msg)
223 {
224 struct net_device *dev = edev->net;
225 struct bnxt *bp = netdev_priv(dev);
226 struct input *req;
227 int rc;
228
229 if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state)
230 return -EBUSY;
231
232 mutex_lock(&bp->hwrm_cmd_lock);
233 req = fw_msg->msg;
234 req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
235 rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
236 fw_msg->timeout);
237 if (!rc) {
238 struct output *resp = bp->hwrm_cmd_resp_addr;
239 u32 len = le16_to_cpu(resp->resp_len);
240
241 if (fw_msg->resp_max_len < len)
242 len = fw_msg->resp_max_len;
243
244 memcpy(fw_msg->resp, resp, len);
245 }
246 mutex_unlock(&bp->hwrm_cmd_lock);
247 return rc;
248 }
249
bnxt_ulp_get(struct bnxt_ulp * ulp)250 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
251 {
252 atomic_inc(&ulp->ref_count);
253 }
254
bnxt_ulp_put(struct bnxt_ulp * ulp)255 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
256 {
257 atomic_dec(&ulp->ref_count);
258 }
259
bnxt_ulp_stop(struct bnxt * bp)260 void bnxt_ulp_stop(struct bnxt *bp)
261 {
262 struct bnxt_en_dev *edev = bp->edev;
263 struct bnxt_ulp_ops *ops;
264 int i;
265
266 if (!edev)
267 return;
268
269 for (i = 0; i < BNXT_MAX_ULP; i++) {
270 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
271
272 ops = rtnl_dereference(ulp->ulp_ops);
273 if (!ops || !ops->ulp_stop)
274 continue;
275 ops->ulp_stop(ulp->handle);
276 }
277 }
278
bnxt_ulp_start(struct bnxt * bp)279 void bnxt_ulp_start(struct bnxt *bp)
280 {
281 struct bnxt_en_dev *edev = bp->edev;
282 struct bnxt_ulp_ops *ops;
283 int i;
284
285 if (!edev)
286 return;
287
288 for (i = 0; i < BNXT_MAX_ULP; i++) {
289 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
290
291 ops = rtnl_dereference(ulp->ulp_ops);
292 if (!ops || !ops->ulp_start)
293 continue;
294 ops->ulp_start(ulp->handle);
295 }
296 }
297
bnxt_ulp_sriov_cfg(struct bnxt * bp,int num_vfs)298 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
299 {
300 struct bnxt_en_dev *edev = bp->edev;
301 struct bnxt_ulp_ops *ops;
302 int i;
303
304 if (!edev)
305 return;
306
307 for (i = 0; i < BNXT_MAX_ULP; i++) {
308 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
309
310 rcu_read_lock();
311 ops = rcu_dereference(ulp->ulp_ops);
312 if (!ops || !ops->ulp_sriov_config) {
313 rcu_read_unlock();
314 continue;
315 }
316 bnxt_ulp_get(ulp);
317 rcu_read_unlock();
318 ops->ulp_sriov_config(ulp->handle, num_vfs);
319 bnxt_ulp_put(ulp);
320 }
321 }
322
bnxt_ulp_shutdown(struct bnxt * bp)323 void bnxt_ulp_shutdown(struct bnxt *bp)
324 {
325 struct bnxt_en_dev *edev = bp->edev;
326 struct bnxt_ulp_ops *ops;
327 int i;
328
329 if (!edev)
330 return;
331
332 for (i = 0; i < BNXT_MAX_ULP; i++) {
333 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
334
335 ops = rtnl_dereference(ulp->ulp_ops);
336 if (!ops || !ops->ulp_shutdown)
337 continue;
338 ops->ulp_shutdown(ulp->handle);
339 }
340 }
341
bnxt_ulp_irq_stop(struct bnxt * bp)342 void bnxt_ulp_irq_stop(struct bnxt *bp)
343 {
344 struct bnxt_en_dev *edev = bp->edev;
345 struct bnxt_ulp_ops *ops;
346
347 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
348 return;
349
350 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
351 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
352
353 if (!ulp->msix_requested)
354 return;
355
356 ops = rtnl_dereference(ulp->ulp_ops);
357 if (!ops || !ops->ulp_irq_stop)
358 return;
359 ops->ulp_irq_stop(ulp->handle);
360 }
361 }
362
bnxt_ulp_irq_restart(struct bnxt * bp,int err)363 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
364 {
365 struct bnxt_en_dev *edev = bp->edev;
366 struct bnxt_ulp_ops *ops;
367
368 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
369 return;
370
371 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
372 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
373 struct bnxt_msix_entry *ent = NULL;
374
375 if (!ulp->msix_requested)
376 return;
377
378 ops = rtnl_dereference(ulp->ulp_ops);
379 if (!ops || !ops->ulp_irq_restart)
380 return;
381
382 if (!err) {
383 ent = kcalloc(ulp->msix_requested, sizeof(*ent),
384 GFP_KERNEL);
385 if (!ent)
386 return;
387 bnxt_fill_msix_vecs(bp, ent);
388 }
389 ops->ulp_irq_restart(ulp->handle, ent);
390 kfree(ent);
391 }
392 }
393
bnxt_ulp_async_events(struct bnxt * bp,struct hwrm_async_event_cmpl * cmpl)394 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
395 {
396 u16 event_id = le16_to_cpu(cmpl->event_id);
397 struct bnxt_en_dev *edev = bp->edev;
398 struct bnxt_ulp_ops *ops;
399 int i;
400
401 if (!edev)
402 return;
403
404 rcu_read_lock();
405 for (i = 0; i < BNXT_MAX_ULP; i++) {
406 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
407
408 ops = rcu_dereference(ulp->ulp_ops);
409 if (!ops || !ops->ulp_async_notifier)
410 continue;
411 if (!ulp->async_events_bmap ||
412 event_id > ulp->max_async_event_id)
413 continue;
414
415 /* Read max_async_event_id first before testing the bitmap. */
416 smp_rmb();
417 if (test_bit(event_id, ulp->async_events_bmap))
418 ops->ulp_async_notifier(ulp->handle, cmpl);
419 }
420 rcu_read_unlock();
421 }
422
bnxt_register_async_events(struct bnxt_en_dev * edev,int ulp_id,unsigned long * events_bmap,u16 max_id)423 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
424 unsigned long *events_bmap, u16 max_id)
425 {
426 struct net_device *dev = edev->net;
427 struct bnxt *bp = netdev_priv(dev);
428 struct bnxt_ulp *ulp;
429
430 if (ulp_id >= BNXT_MAX_ULP)
431 return -EINVAL;
432
433 ulp = &edev->ulp_tbl[ulp_id];
434 ulp->async_events_bmap = events_bmap;
435 /* Make sure bnxt_ulp_async_events() sees this order */
436 smp_wmb();
437 ulp->max_async_event_id = max_id;
438 bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
439 return 0;
440 }
441
442 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
443 .bnxt_register_device = bnxt_register_dev,
444 .bnxt_unregister_device = bnxt_unregister_dev,
445 .bnxt_request_msix = bnxt_req_msix_vecs,
446 .bnxt_free_msix = bnxt_free_msix_vecs,
447 .bnxt_send_fw_msg = bnxt_send_msg,
448 .bnxt_register_fw_async_events = bnxt_register_async_events,
449 };
450
bnxt_ulp_probe(struct net_device * dev)451 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
452 {
453 struct bnxt *bp = netdev_priv(dev);
454 struct bnxt_en_dev *edev;
455
456 edev = bp->edev;
457 if (!edev) {
458 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
459 if (!edev)
460 return ERR_PTR(-ENOMEM);
461 edev->en_ops = &bnxt_en_ops_tbl;
462 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
463 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
464 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
465 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
466 edev->net = dev;
467 edev->pdev = bp->pdev;
468 bp->edev = edev;
469 }
470 return bp->edev;
471 }
472
