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11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/pci.h>
14#include <linux/sysfs.h>
15#include "ifcvf_base.h"
16
17#define VERSION_STRING "0.1"
18#define DRIVER_AUTHOR "Intel Corporation"
19#define IFCVF_DRIVER_NAME "ifcvf"
20
21static irqreturn_t ifcvf_config_changed(int irq, void *arg)
22{
23 struct ifcvf_hw *vf = arg;
24
25 if (vf->config_cb.callback)
26 return vf->config_cb.callback(vf->config_cb.private);
27
28 return IRQ_HANDLED;
29}
30
31static irqreturn_t ifcvf_intr_handler(int irq, void *arg)
32{
33 struct vring_info *vring = arg;
34
35 if (vring->cb.callback)
36 return vring->cb.callback(vring->cb.private);
37
38 return IRQ_HANDLED;
39}
40
41static void ifcvf_free_irq_vectors(void *data)
42{
43 pci_free_irq_vectors(data);
44}
45
46static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues)
47{
48 struct pci_dev *pdev = adapter->pdev;
49 struct ifcvf_hw *vf = &adapter->vf;
50 int i;
51
52
53 for (i = 0; i < queues; i++) {
54 devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
55 vf->vring[i].irq = -EINVAL;
56 }
57
58 devm_free_irq(&pdev->dev, vf->config_irq, vf);
59 ifcvf_free_irq_vectors(pdev);
60}
61
62static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
63{
64 struct pci_dev *pdev = adapter->pdev;
65 struct ifcvf_hw *vf = &adapter->vf;
66 int vector, i, ret, irq;
67
68 ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
69 IFCVF_MAX_INTR, PCI_IRQ_MSIX);
70 if (ret < 0) {
71 IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
72 return ret;
73 }
74
75 snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
76 pci_name(pdev));
77 vector = 0;
78 vf->config_irq = pci_irq_vector(pdev, vector);
79 ret = devm_request_irq(&pdev->dev, vf->config_irq,
80 ifcvf_config_changed, 0,
81 vf->config_msix_name, vf);
82 if (ret) {
83 IFCVF_ERR(pdev, "Failed to request config irq\n");
84 return ret;
85 }
86
87 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
88 snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
89 pci_name(pdev), i);
90 vector = i + IFCVF_MSI_QUEUE_OFF;
91 irq = pci_irq_vector(pdev, vector);
92 ret = devm_request_irq(&pdev->dev, irq,
93 ifcvf_intr_handler, 0,
94 vf->vring[i].msix_name,
95 &vf->vring[i]);
96 if (ret) {
97 IFCVF_ERR(pdev,
98 "Failed to request irq for vq %d\n", i);
99 ifcvf_free_irq(adapter, i);
100
101 return ret;
102 }
103
104 vf->vring[i].irq = irq;
105 }
106
107 return 0;
108}
109
110static int ifcvf_start_datapath(void *private)
111{
112 struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
113 u8 status;
114 int ret;
115
116 vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
117 ret = ifcvf_start_hw(vf);
118 if (ret < 0) {
119 status = ifcvf_get_status(vf);
120 status |= VIRTIO_CONFIG_S_FAILED;
121 ifcvf_set_status(vf, status);
122 }
123
124 return ret;
125}
126
127static int ifcvf_stop_datapath(void *private)
128{
129 struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
130 int i;
131
132 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
133 vf->vring[i].cb.callback = NULL;
134
135 ifcvf_stop_hw(vf);
136
137 return 0;
138}
139
140static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
141{
142 struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
143 int i;
144
145 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
146 vf->vring[i].last_avail_idx = 0;
147 vf->vring[i].desc = 0;
148 vf->vring[i].avail = 0;
149 vf->vring[i].used = 0;
150 vf->vring[i].ready = 0;
151 vf->vring[i].cb.callback = NULL;
152 vf->vring[i].cb.private = NULL;
153 }
154
155 ifcvf_reset(vf);
156}
157
158static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
159{
160 return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
161}
162
163static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
164{
165 struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
166
167 return &adapter->vf;
168}
169
170static u64 ifcvf_vdpa_get_features(struct vdpa_device *vdpa_dev)
171{
172 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
173 u64 features;
174
175 features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;
176
177 return features;
178}
179
180static int ifcvf_vdpa_set_features(struct vdpa_device *vdpa_dev, u64 features)
181{
182 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
183
184 vf->req_features = features;
185
186 return 0;
187}
188
189static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
190{
191 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
192
193 return ifcvf_get_status(vf);
194}
195
196static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
197{
198 struct ifcvf_adapter *adapter;
199 struct ifcvf_hw *vf;
200 u8 status_old;
201 int ret;
202
203 vf = vdpa_to_vf(vdpa_dev);
204 adapter = dev_get_drvdata(vdpa_dev->dev.parent);
205 status_old = ifcvf_get_status(vf);
206
207 if (status_old == status)
208 return;
209
210 if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
211 !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
212 ifcvf_stop_datapath(adapter);
213 ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2);
214 }
215
216 if (status == 0) {
217 ifcvf_reset_vring(adapter);
218 return;
219 }
220
221 if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
222 !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
223 ret = ifcvf_request_irq(adapter);
224 if (ret) {
225 status = ifcvf_get_status(vf);
226 status |= VIRTIO_CONFIG_S_FAILED;
227 ifcvf_set_status(vf, status);
228 return;
229 }
230
231 if (ifcvf_start_datapath(adapter) < 0)
232 IFCVF_ERR(adapter->pdev,
233 "Failed to set ifcvf vdpa status %u\n",
234 status);
235 }
236
237 ifcvf_set_status(vf, status);
238}
239
240static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
241{
242 return IFCVF_QUEUE_MAX;
243}
244
245static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
246 struct vdpa_vq_state *state)
247{
248 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
249
250 state->avail_index = ifcvf_get_vq_state(vf, qid);
251 return 0;
252}
253
254static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
255 const struct vdpa_vq_state *state)
256{
257 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
258
259 return ifcvf_set_vq_state(vf, qid, state->avail_index);
260}
261
262static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
263 struct vdpa_callback *cb)
264{
265 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
266
267 vf->vring[qid].cb = *cb;
268}
269
270static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
271 u16 qid, bool ready)
272{
273 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
274
275 vf->vring[qid].ready = ready;
276}
277
278static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
279{
280 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
281
282 return vf->vring[qid].ready;
283}
284
285static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
286 u32 num)
287{
288 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
289
290 vf->vring[qid].size = num;
291}
292
293static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
294 u64 desc_area, u64 driver_area,
295 u64 device_area)
296{
297 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
298
299 vf->vring[qid].desc = desc_area;
300 vf->vring[qid].avail = driver_area;
301 vf->vring[qid].used = device_area;
302
303 return 0;
304}
305
306static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
307{
308 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
309
310 ifcvf_notify_queue(vf, qid);
311}
312
313static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
314{
315 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
316
317 return ioread8(&vf->common_cfg->config_generation);
318}
319
320static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
321{
322 return VIRTIO_ID_NET;
323}
324
325static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
326{
327 return IFCVF_SUBSYS_VENDOR_ID;
328}
329
330static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
331{
332 return IFCVF_QUEUE_ALIGNMENT;
333}
334
335static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
336 unsigned int offset,
337 void *buf, unsigned int len)
338{
339 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
340
341 WARN_ON(offset + len > sizeof(struct virtio_net_config));
342 ifcvf_read_net_config(vf, offset, buf, len);
343}
344
345static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
346 unsigned int offset, const void *buf,
347 unsigned int len)
348{
349 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
350
351 WARN_ON(offset + len > sizeof(struct virtio_net_config));
352 ifcvf_write_net_config(vf, offset, buf, len);
353}
354
355static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
356 struct vdpa_callback *cb)
357{
358 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
359
360 vf->config_cb.callback = cb->callback;
361 vf->config_cb.private = cb->private;
362}
363
364static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
365 u16 qid)
366{
367 struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
368
369 return vf->vring[qid].irq;
370}
371
372
373
374
375
376static const struct vdpa_config_ops ifc_vdpa_ops = {
377 .get_features = ifcvf_vdpa_get_features,
378 .set_features = ifcvf_vdpa_set_features,
379 .get_status = ifcvf_vdpa_get_status,
380 .set_status = ifcvf_vdpa_set_status,
381 .get_vq_num_max = ifcvf_vdpa_get_vq_num_max,
382 .get_vq_state = ifcvf_vdpa_get_vq_state,
383 .set_vq_state = ifcvf_vdpa_set_vq_state,
384 .set_vq_cb = ifcvf_vdpa_set_vq_cb,
385 .set_vq_ready = ifcvf_vdpa_set_vq_ready,
386 .get_vq_ready = ifcvf_vdpa_get_vq_ready,
387 .set_vq_num = ifcvf_vdpa_set_vq_num,
388 .set_vq_address = ifcvf_vdpa_set_vq_address,
389 .get_vq_irq = ifcvf_vdpa_get_vq_irq,
390 .kick_vq = ifcvf_vdpa_kick_vq,
391 .get_generation = ifcvf_vdpa_get_generation,
392 .get_device_id = ifcvf_vdpa_get_device_id,
393 .get_vendor_id = ifcvf_vdpa_get_vendor_id,
394 .get_vq_align = ifcvf_vdpa_get_vq_align,
395 .get_config = ifcvf_vdpa_get_config,
396 .set_config = ifcvf_vdpa_set_config,
397 .set_config_cb = ifcvf_vdpa_set_config_cb,
398};
399
400static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
401{
402 struct device *dev = &pdev->dev;
403 struct ifcvf_adapter *adapter;
404 struct ifcvf_hw *vf;
405 int ret, i;
406
407 ret = pcim_enable_device(pdev);
408 if (ret) {
409 IFCVF_ERR(pdev, "Failed to enable device\n");
410 return ret;
411 }
412
413 ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
414 IFCVF_DRIVER_NAME);
415 if (ret) {
416 IFCVF_ERR(pdev, "Failed to request MMIO region\n");
417 return ret;
418 }
419
420 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
421 if (ret) {
422 IFCVF_ERR(pdev, "No usable DMA configuration\n");
423 return ret;
424 }
425
426 ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
427 if (ret) {
428 IFCVF_ERR(pdev,
429 "Failed for adding devres for freeing irq vectors\n");
430 return ret;
431 }
432
433 adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
434 dev, &ifc_vdpa_ops,
435 IFCVF_MAX_QUEUE_PAIRS * 2);
436 if (adapter == NULL) {
437 IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
438 return -ENOMEM;
439 }
440
441 pci_set_master(pdev);
442 pci_set_drvdata(pdev, adapter);
443
444 vf = &adapter->vf;
445 vf->base = pcim_iomap_table(pdev);
446
447 adapter->pdev = pdev;
448 adapter->vdpa.dma_dev = &pdev->dev;
449
450 ret = ifcvf_init_hw(vf, pdev);
451 if (ret) {
452 IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
453 goto err;
454 }
455
456 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
457 vf->vring[i].irq = -EINVAL;
458
459 ret = vdpa_register_device(&adapter->vdpa);
460 if (ret) {
461 IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
462 goto err;
463 }
464
465 return 0;
466
467err:
468 put_device(&adapter->vdpa.dev);
469 return ret;
470}
471
472static void ifcvf_remove(struct pci_dev *pdev)
473{
474 struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
475
476 vdpa_unregister_device(&adapter->vdpa);
477}
478
479static struct pci_device_id ifcvf_pci_ids[] = {
480 { PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
481 IFCVF_DEVICE_ID,
482 IFCVF_SUBSYS_VENDOR_ID,
483 IFCVF_SUBSYS_DEVICE_ID) },
484 { 0 },
485};
486MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
487
488static struct pci_driver ifcvf_driver = {
489 .name = IFCVF_DRIVER_NAME,
490 .id_table = ifcvf_pci_ids,
491 .probe = ifcvf_probe,
492 .remove = ifcvf_remove,
493};
494
495module_pci_driver(ifcvf_driver);
496
497MODULE_LICENSE("GPL v2");
498MODULE_VERSION(VERSION_STRING);
499
