1 /*
2 * Copyright 2014 Cisco Systems, Inc. All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/types.h>
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/if_ether.h>
24 #include <linux/slab.h>
25 #include "vnic_resource.h"
26 #include "vnic_devcmd.h"
27 #include "vnic_dev.h"
28 #include "vnic_stats.h"
29 #include "vnic_wq.h"
30
31 #define VNIC_DVCMD_TMO 10000 /* Devcmd Timeout value */
32 #define VNIC_NOTIFY_INTR_MASK 0x0000ffff00000000ULL
33
34 struct devcmd2_controller {
35 struct vnic_wq_ctrl __iomem *wq_ctrl;
36 struct vnic_dev_ring results_ring;
37 struct vnic_wq wq;
38 struct vnic_devcmd2 *cmd_ring;
39 struct devcmd2_result *result;
40 u16 next_result;
41 u16 result_size;
42 int color;
43 };
44
45 struct vnic_res {
46 void __iomem *vaddr;
47 unsigned int count;
48 };
49
50 struct vnic_dev {
51 void *priv;
52 struct pci_dev *pdev;
53 struct vnic_res res[RES_TYPE_MAX];
54 enum vnic_dev_intr_mode intr_mode;
55 struct vnic_devcmd __iomem *devcmd;
56 struct vnic_devcmd_notify *notify;
57 struct vnic_devcmd_notify notify_copy;
58 dma_addr_t notify_pa;
59 u32 *linkstatus;
60 dma_addr_t linkstatus_pa;
61 struct vnic_stats *stats;
62 dma_addr_t stats_pa;
63 struct vnic_devcmd_fw_info *fw_info;
64 dma_addr_t fw_info_pa;
65 u64 args[VNIC_DEVCMD_NARGS];
66 struct devcmd2_controller *devcmd2;
67
68 int (*devcmd_rtn)(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
69 int wait);
70 };
71
72 #define VNIC_MAX_RES_HDR_SIZE \
73 (sizeof(struct vnic_resource_header) + \
74 sizeof(struct vnic_resource) * RES_TYPE_MAX)
75 #define VNIC_RES_STRIDE 128
76
svnic_dev_priv(struct vnic_dev * vdev)77 void *svnic_dev_priv(struct vnic_dev *vdev)
78 {
79 return vdev->priv;
80 }
81
vnic_dev_discover_res(struct vnic_dev * vdev,struct vnic_dev_bar * bar,unsigned int num_bars)82 static int vnic_dev_discover_res(struct vnic_dev *vdev,
83 struct vnic_dev_bar *bar, unsigned int num_bars)
84 {
85 struct vnic_resource_header __iomem *rh;
86 struct vnic_resource __iomem *r;
87 u8 type;
88
89 if (num_bars == 0)
90 return -EINVAL;
91
92 if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
93 pr_err("vNIC BAR0 res hdr length error\n");
94
95 return -EINVAL;
96 }
97
98 rh = bar->vaddr;
99 if (!rh) {
100 pr_err("vNIC BAR0 res hdr not mem-mapped\n");
101
102 return -EINVAL;
103 }
104
105 if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
106 ioread32(&rh->version) != VNIC_RES_VERSION) {
107 pr_err("vNIC BAR0 res magic/version error exp (%lx/%lx) curr (%x/%x)\n",
108 VNIC_RES_MAGIC, VNIC_RES_VERSION,
109 ioread32(&rh->magic), ioread32(&rh->version));
110
111 return -EINVAL;
112 }
113
114 r = (struct vnic_resource __iomem *)(rh + 1);
115
116 while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {
117
118 u8 bar_num = ioread8(&r->bar);
119 u32 bar_offset = ioread32(&r->bar_offset);
120 u32 count = ioread32(&r->count);
121 u32 len;
122
123 r++;
124
125 if (bar_num >= num_bars)
126 continue;
127
128 if (!bar[bar_num].len || !bar[bar_num].vaddr)
129 continue;
130
131 switch (type) {
132 case RES_TYPE_WQ:
133 case RES_TYPE_RQ:
134 case RES_TYPE_CQ:
135 case RES_TYPE_INTR_CTRL:
136 /* each count is stride bytes long */
137 len = count * VNIC_RES_STRIDE;
138 if (len + bar_offset > bar->len) {
139 pr_err("vNIC BAR0 resource %d out-of-bounds, offset 0x%x + size 0x%x > bar len 0x%lx\n",
140 type, bar_offset,
141 len,
142 bar->len);
143
144 return -EINVAL;
145 }
146 break;
147
148 case RES_TYPE_INTR_PBA_LEGACY:
149 case RES_TYPE_DEVCMD:
150 case RES_TYPE_DEVCMD2:
151 len = count;
152 break;
153
154 default:
155 continue;
156 }
157
158 vdev->res[type].count = count;
159 vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
160 }
161
162 return 0;
163 }
164
svnic_dev_get_res_count(struct vnic_dev * vdev,enum vnic_res_type type)165 unsigned int svnic_dev_get_res_count(struct vnic_dev *vdev,
166 enum vnic_res_type type)
167 {
168 return vdev->res[type].count;
169 }
170
svnic_dev_get_res(struct vnic_dev * vdev,enum vnic_res_type type,unsigned int index)171 void __iomem *svnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
172 unsigned int index)
173 {
174 if (!vdev->res[type].vaddr)
175 return NULL;
176
177 switch (type) {
178 case RES_TYPE_WQ:
179 case RES_TYPE_RQ:
180 case RES_TYPE_CQ:
181 case RES_TYPE_INTR_CTRL:
182 return (char __iomem *)vdev->res[type].vaddr +
183 index * VNIC_RES_STRIDE;
184
185 default:
186 return (char __iomem *)vdev->res[type].vaddr;
187 }
188 }
189
svnic_dev_desc_ring_size(struct vnic_dev_ring * ring,unsigned int desc_count,unsigned int desc_size)190 unsigned int svnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
191 unsigned int desc_count,
192 unsigned int desc_size)
193 {
194 /* The base address of the desc rings must be 512 byte aligned.
195 * Descriptor count is aligned to groups of 32 descriptors. A
196 * count of 0 means the maximum 4096 descriptors. Descriptor
197 * size is aligned to 16 bytes.
198 */
199
200 unsigned int count_align = 32;
201 unsigned int desc_align = 16;
202
203 ring->base_align = 512;
204
205 if (desc_count == 0)
206 desc_count = 4096;
207
208 ring->desc_count = ALIGN(desc_count, count_align);
209
210 ring->desc_size = ALIGN(desc_size, desc_align);
211
212 ring->size = ring->desc_count * ring->desc_size;
213 ring->size_unaligned = ring->size + ring->base_align;
214
215 return ring->size_unaligned;
216 }
217
svnic_dev_clear_desc_ring(struct vnic_dev_ring * ring)218 void svnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
219 {
220 memset(ring->descs, 0, ring->size);
221 }
222
svnic_dev_alloc_desc_ring(struct vnic_dev * vdev,struct vnic_dev_ring * ring,unsigned int desc_count,unsigned int desc_size)223 int svnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
224 unsigned int desc_count, unsigned int desc_size)
225 {
226 svnic_dev_desc_ring_size(ring, desc_count, desc_size);
227
228 ring->descs_unaligned = dma_alloc_coherent(&vdev->pdev->dev,
229 ring->size_unaligned, &ring->base_addr_unaligned,
230 GFP_KERNEL);
231 if (!ring->descs_unaligned) {
232 pr_err("Failed to allocate ring (size=%d), aborting\n",
233 (int)ring->size);
234
235 return -ENOMEM;
236 }
237
238 ring->base_addr = ALIGN(ring->base_addr_unaligned,
239 ring->base_align);
240 ring->descs = (u8 *)ring->descs_unaligned +
241 (ring->base_addr - ring->base_addr_unaligned);
242
243 svnic_dev_clear_desc_ring(ring);
244
245 ring->desc_avail = ring->desc_count - 1;
246
247 return 0;
248 }
249
svnic_dev_free_desc_ring(struct vnic_dev * vdev,struct vnic_dev_ring * ring)250 void svnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
251 {
252 if (ring->descs) {
253 dma_free_coherent(&vdev->pdev->dev,
254 ring->size_unaligned,
255 ring->descs_unaligned,
256 ring->base_addr_unaligned);
257 ring->descs = NULL;
258 }
259 }
260
_svnic_dev_cmd2(struct vnic_dev * vdev,enum vnic_devcmd_cmd cmd,int wait)261 static int _svnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
262 int wait)
263 {
264 struct devcmd2_controller *dc2c = vdev->devcmd2;
265 struct devcmd2_result *result = NULL;
266 unsigned int i;
267 int delay;
268 int err;
269 u32 posted;
270 u32 fetch_idx;
271 u32 new_posted;
272 u8 color;
273
274 fetch_idx = ioread32(&dc2c->wq_ctrl->fetch_index);
275 if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone */
276 /* Hardware surprise removal: return error */
277 return -ENODEV;
278 }
279
280 posted = ioread32(&dc2c->wq_ctrl->posted_index);
281
282 if (posted == 0xFFFFFFFF) { /* check for hardware gone */
283 /* Hardware surprise removal: return error */
284 return -ENODEV;
285 }
286
287 new_posted = (posted + 1) % DEVCMD2_RING_SIZE;
288 if (new_posted == fetch_idx) {
289 pr_err("%s: wq is full while issuing devcmd2 command %d, fetch index: %u, posted index: %u\n",
290 pci_name(vdev->pdev), _CMD_N(cmd), fetch_idx, posted);
291
292 return -EBUSY;
293 }
294
295 dc2c->cmd_ring[posted].cmd = cmd;
296 dc2c->cmd_ring[posted].flags = 0;
297
298 if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
299 dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT;
300
301 if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
302 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
303 dc2c->cmd_ring[posted].args[i] = vdev->args[i];
304 }
305 /* Adding write memory barrier prevents compiler and/or CPU
306 * reordering, thus avoiding descriptor posting before
307 * descriptor is initialized. Otherwise, hardware can read
308 * stale descriptor fields.
309 */
310 wmb();
311 iowrite32(new_posted, &dc2c->wq_ctrl->posted_index);
312
313 if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT)
314 return 0;
315
316 result = dc2c->result + dc2c->next_result;
317 color = dc2c->color;
318
319 /*
320 * Increment next_result, after posting the devcmd, irrespective of
321 * devcmd result, and it should be done only once.
322 */
323 dc2c->next_result++;
324 if (dc2c->next_result == dc2c->result_size) {
325 dc2c->next_result = 0;
326 dc2c->color = dc2c->color ? 0 : 1;
327 }
328
329 for (delay = 0; delay < wait; delay++) {
330 udelay(100);
331 if (result->color == color) {
332 if (result->error) {
333 err = (int) result->error;
334 if (err != ERR_ECMDUNKNOWN ||
335 cmd != CMD_CAPABILITY)
336 pr_err("Error %d devcmd %d\n",
337 err, _CMD_N(cmd));
338
339 return err;
340 }
341 if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
342 for (i = 0; i < VNIC_DEVCMD_NARGS; i++)
343 vdev->args[i] = result->results[i];
344 }
345
346 return 0;
347 }
348 }
349
350 pr_err("Timed out devcmd %d\n", _CMD_N(cmd));
351
352 return -ETIMEDOUT;
353 }
354
svnic_dev_init_devcmd2(struct vnic_dev * vdev)355 static int svnic_dev_init_devcmd2(struct vnic_dev *vdev)
356 {
357 struct devcmd2_controller *dc2c = NULL;
358 unsigned int fetch_idx;
359 int ret;
360 void __iomem *p;
361
362 if (vdev->devcmd2)
363 return 0;
364
365 p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
366 if (!p)
367 return -ENODEV;
368
369 dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC);
370 if (!dc2c)
371 return -ENOMEM;
372
373 vdev->devcmd2 = dc2c;
374
375 dc2c->color = 1;
376 dc2c->result_size = DEVCMD2_RING_SIZE;
377
378 ret = vnic_wq_devcmd2_alloc(vdev,
379 &dc2c->wq,
380 DEVCMD2_RING_SIZE,
381 DEVCMD2_DESC_SIZE);
382 if (ret)
383 goto err_free_devcmd2;
384
385 fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index);
386 if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone */
387 /* Hardware surprise removal: reset fetch_index */
388 fetch_idx = 0;
389 }
390
391 /*
392 * Don't change fetch_index ever and
393 * set posted_index same as fetch_index
394 * when setting up the WQ for devcmd2.
395 */
396 vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0);
397 svnic_wq_enable(&dc2c->wq);
398 ret = svnic_dev_alloc_desc_ring(vdev,
399 &dc2c->results_ring,
400 DEVCMD2_RING_SIZE,
401 DEVCMD2_DESC_SIZE);
402 if (ret)
403 goto err_free_wq;
404
405 dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs;
406 dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs;
407 dc2c->wq_ctrl = dc2c->wq.ctrl;
408 vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET;
409 vdev->args[1] = DEVCMD2_RING_SIZE;
410
411 ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO);
412 if (ret < 0)
413 goto err_free_desc_ring;
414
415 vdev->devcmd_rtn = &_svnic_dev_cmd2;
416 pr_info("DEVCMD2 Initialized.\n");
417
418 return ret;
419
420 err_free_desc_ring:
421 svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
422
423 err_free_wq:
424 svnic_wq_disable(&dc2c->wq);
425 svnic_wq_free(&dc2c->wq);
426
427 err_free_devcmd2:
428 kfree(dc2c);
429 vdev->devcmd2 = NULL;
430
431 return ret;
432 } /* end of svnic_dev_init_devcmd2 */
433
vnic_dev_deinit_devcmd2(struct vnic_dev * vdev)434 static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev)
435 {
436 struct devcmd2_controller *dc2c = vdev->devcmd2;
437
438 vdev->devcmd2 = NULL;
439 vdev->devcmd_rtn = NULL;
440
441 svnic_dev_free_desc_ring(vdev, &dc2c->results_ring);
442 svnic_wq_disable(&dc2c->wq);
443 svnic_wq_free(&dc2c->wq);
444 kfree(dc2c);
445 }
446
svnic_dev_cmd(struct vnic_dev * vdev,enum vnic_devcmd_cmd cmd,u64 * a0,u64 * a1,int wait)447 int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
448 u64 *a0, u64 *a1, int wait)
449 {
450 int err;
451
452 memset(vdev->args, 0, sizeof(vdev->args));
453 vdev->args[0] = *a0;
454 vdev->args[1] = *a1;
455
456 err = (*vdev->devcmd_rtn)(vdev, cmd, wait);
457
458 *a0 = vdev->args[0];
459 *a1 = vdev->args[1];
460
461 return err;
462 }
463
svnic_dev_fw_info(struct vnic_dev * vdev,struct vnic_devcmd_fw_info ** fw_info)464 int svnic_dev_fw_info(struct vnic_dev *vdev,
465 struct vnic_devcmd_fw_info **fw_info)
466 {
467 u64 a0, a1 = 0;
468 int wait = VNIC_DVCMD_TMO;
469 int err = 0;
470
471 if (!vdev->fw_info) {
472 vdev->fw_info = dma_alloc_coherent(&vdev->pdev->dev,
473 sizeof(struct vnic_devcmd_fw_info),
474 &vdev->fw_info_pa, GFP_KERNEL);
475 if (!vdev->fw_info)
476 return -ENOMEM;
477
478 a0 = vdev->fw_info_pa;
479
480 /* only get fw_info once and cache it */
481 err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
482 }
483
484 *fw_info = vdev->fw_info;
485
486 return err;
487 }
488
svnic_dev_spec(struct vnic_dev * vdev,unsigned int offset,unsigned int size,void * value)489 int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset,
490 unsigned int size, void *value)
491 {
492 u64 a0, a1;
493 int wait = VNIC_DVCMD_TMO;
494 int err;
495
496 a0 = offset;
497 a1 = size;
498
499 err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
500
501 switch (size) {
502 case 1:
503 *(u8 *)value = (u8)a0;
504 break;
505 case 2:
506 *(u16 *)value = (u16)a0;
507 break;
508 case 4:
509 *(u32 *)value = (u32)a0;
510 break;
511 case 8:
512 *(u64 *)value = a0;
513 break;
514 default:
515 BUG();
516 break;
517 }
518
519 return err;
520 }
521
svnic_dev_stats_clear(struct vnic_dev * vdev)522 int svnic_dev_stats_clear(struct vnic_dev *vdev)
523 {
524 u64 a0 = 0, a1 = 0;
525 int wait = VNIC_DVCMD_TMO;
526
527 return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
528 }
529
svnic_dev_stats_dump(struct vnic_dev * vdev,struct vnic_stats ** stats)530 int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
531 {
532 u64 a0, a1;
533 int wait = VNIC_DVCMD_TMO;
534
535 if (!vdev->stats) {
536 vdev->stats = dma_alloc_coherent(&vdev->pdev->dev,
537 sizeof(struct vnic_stats), &vdev->stats_pa, GFP_KERNEL);
538 if (!vdev->stats)
539 return -ENOMEM;
540 }
541
542 *stats = vdev->stats;
543 a0 = vdev->stats_pa;
544 a1 = sizeof(struct vnic_stats);
545
546 return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
547 }
548
svnic_dev_close(struct vnic_dev * vdev)549 int svnic_dev_close(struct vnic_dev *vdev)
550 {
551 u64 a0 = 0, a1 = 0;
552 int wait = VNIC_DVCMD_TMO;
553
554 return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
555 }
556
svnic_dev_enable_wait(struct vnic_dev * vdev)557 int svnic_dev_enable_wait(struct vnic_dev *vdev)
558 {
559 u64 a0 = 0, a1 = 0;
560 int wait = VNIC_DVCMD_TMO;
561 int err = 0;
562
563 err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait);
564 if (err == ERR_ECMDUNKNOWN)
565 return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
566
567 return err;
568 }
569
svnic_dev_disable(struct vnic_dev * vdev)570 int svnic_dev_disable(struct vnic_dev *vdev)
571 {
572 u64 a0 = 0, a1 = 0;
573 int wait = VNIC_DVCMD_TMO;
574
575 return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
576 }
577
svnic_dev_open(struct vnic_dev * vdev,int arg)578 int svnic_dev_open(struct vnic_dev *vdev, int arg)
579 {
580 u64 a0 = (u32)arg, a1 = 0;
581 int wait = VNIC_DVCMD_TMO;
582
583 return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
584 }
585
svnic_dev_open_done(struct vnic_dev * vdev,int * done)586 int svnic_dev_open_done(struct vnic_dev *vdev, int *done)
587 {
588 u64 a0 = 0, a1 = 0;
589 int wait = VNIC_DVCMD_TMO;
590 int err;
591
592 *done = 0;
593
594 err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
595 if (err)
596 return err;
597
598 *done = (a0 == 0);
599
600 return 0;
601 }
602
svnic_dev_notify_set(struct vnic_dev * vdev,u16 intr)603 int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
604 {
605 u64 a0, a1;
606 int wait = VNIC_DVCMD_TMO;
607
608 if (!vdev->notify) {
609 vdev->notify = dma_alloc_coherent(&vdev->pdev->dev,
610 sizeof(struct vnic_devcmd_notify),
611 &vdev->notify_pa, GFP_KERNEL);
612 if (!vdev->notify)
613 return -ENOMEM;
614 }
615
616 a0 = vdev->notify_pa;
617 a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK;
618 a1 += sizeof(struct vnic_devcmd_notify);
619
620 return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
621 }
622
svnic_dev_notify_unset(struct vnic_dev * vdev)623 void svnic_dev_notify_unset(struct vnic_dev *vdev)
624 {
625 u64 a0, a1;
626 int wait = VNIC_DVCMD_TMO;
627
628 a0 = 0; /* paddr = 0 to unset notify buffer */
629 a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */
630 a1 += sizeof(struct vnic_devcmd_notify);
631
632 svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
633 }
634
vnic_dev_notify_ready(struct vnic_dev * vdev)635 static int vnic_dev_notify_ready(struct vnic_dev *vdev)
636 {
637 u32 *words;
638 unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
639 unsigned int i;
640 u32 csum;
641
642 if (!vdev->notify)
643 return 0;
644
645 do {
646 csum = 0;
647 memcpy(&vdev->notify_copy, vdev->notify,
648 sizeof(struct vnic_devcmd_notify));
649 words = (u32 *)&vdev->notify_copy;
650 for (i = 1; i < nwords; i++)
651 csum += words[i];
652 } while (csum != words[0]);
653
654 return 1;
655 }
656
svnic_dev_init(struct vnic_dev * vdev,int arg)657 int svnic_dev_init(struct vnic_dev *vdev, int arg)
658 {
659 u64 a0 = (u32)arg, a1 = 0;
660 int wait = VNIC_DVCMD_TMO;
661
662 return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
663 }
664
svnic_dev_link_status(struct vnic_dev * vdev)665 int svnic_dev_link_status(struct vnic_dev *vdev)
666 {
667 if (vdev->linkstatus)
668 return *vdev->linkstatus;
669
670 if (!vnic_dev_notify_ready(vdev))
671 return 0;
672
673 return vdev->notify_copy.link_state;
674 }
675
svnic_dev_link_down_cnt(struct vnic_dev * vdev)676 u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev)
677 {
678 if (!vnic_dev_notify_ready(vdev))
679 return 0;
680
681 return vdev->notify_copy.link_down_cnt;
682 }
683
svnic_dev_set_intr_mode(struct vnic_dev * vdev,enum vnic_dev_intr_mode intr_mode)684 void svnic_dev_set_intr_mode(struct vnic_dev *vdev,
685 enum vnic_dev_intr_mode intr_mode)
686 {
687 vdev->intr_mode = intr_mode;
688 }
689
svnic_dev_get_intr_mode(struct vnic_dev * vdev)690 enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev)
691 {
692 return vdev->intr_mode;
693 }
694
svnic_dev_unregister(struct vnic_dev * vdev)695 void svnic_dev_unregister(struct vnic_dev *vdev)
696 {
697 if (vdev) {
698 if (vdev->notify)
699 dma_free_coherent(&vdev->pdev->dev,
700 sizeof(struct vnic_devcmd_notify),
701 vdev->notify,
702 vdev->notify_pa);
703 if (vdev->linkstatus)
704 dma_free_coherent(&vdev->pdev->dev,
705 sizeof(u32),
706 vdev->linkstatus,
707 vdev->linkstatus_pa);
708 if (vdev->stats)
709 dma_free_coherent(&vdev->pdev->dev,
710 sizeof(struct vnic_stats),
711 vdev->stats, vdev->stats_pa);
712 if (vdev->fw_info)
713 dma_free_coherent(&vdev->pdev->dev,
714 sizeof(struct vnic_devcmd_fw_info),
715 vdev->fw_info, vdev->fw_info_pa);
716 if (vdev->devcmd2)
717 vnic_dev_deinit_devcmd2(vdev);
718 kfree(vdev);
719 }
720 }
721
svnic_dev_alloc_discover(struct vnic_dev * vdev,void * priv,struct pci_dev * pdev,struct vnic_dev_bar * bar,unsigned int num_bars)722 struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev,
723 void *priv,
724 struct pci_dev *pdev,
725 struct vnic_dev_bar *bar,
726 unsigned int num_bars)
727 {
728 if (!vdev) {
729 vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC);
730 if (!vdev)
731 return NULL;
732 }
733
734 vdev->priv = priv;
735 vdev->pdev = pdev;
736
737 if (vnic_dev_discover_res(vdev, bar, num_bars))
738 goto err_out;
739
740 return vdev;
741
742 err_out:
743 svnic_dev_unregister(vdev);
744
745 return NULL;
746 } /* end of svnic_dev_alloc_discover */
747
748 /*
749 * fallback option is left to keep the interface common for other vnics.
750 */
svnic_dev_cmd_init(struct vnic_dev * vdev,int fallback)751 int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback)
752 {
753 int err = -ENODEV;
754 void __iomem *p;
755
756 p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
757 if (p)
758 err = svnic_dev_init_devcmd2(vdev);
759 else
760 pr_err("DEVCMD2 resource not found.\n");
761
762 return err;
763 } /* end of svnic_dev_cmd_init */
764