1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Intel IFC VF NIC driver for virtio dataplane offloading
4 *
5 * Copyright (C) 2020 Intel Corporation.
6 *
7 * Author: Zhu Lingshan <lingshan.zhu@intel.com>
8 *
9 */
10
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
ifcvf_config_changed(int irq,void * arg)21 static 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
ifcvf_intr_handler(int irq,void * arg)31 static 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
ifcvf_free_irq_vectors(void * data)41 static void ifcvf_free_irq_vectors(void *data)
42 {
43 pci_free_irq_vectors(data);
44 }
45
ifcvf_free_irq(struct ifcvf_adapter * adapter,int queues)46 static 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
ifcvf_request_irq(struct ifcvf_adapter * adapter)62 static 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
ifcvf_start_datapath(void * private)110 static 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
ifcvf_stop_datapath(void * private)127 static 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
ifcvf_reset_vring(struct ifcvf_adapter * adapter)140 static 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
vdpa_to_adapter(struct vdpa_device * vdpa_dev)158 static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
159 {
160 return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
161 }
162
vdpa_to_vf(struct vdpa_device * vdpa_dev)163 static 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
ifcvf_vdpa_get_features(struct vdpa_device * vdpa_dev)170 static 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
ifcvf_vdpa_set_features(struct vdpa_device * vdpa_dev,u64 features)180 static 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
ifcvf_vdpa_get_status(struct vdpa_device * vdpa_dev)189 static 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
ifcvf_vdpa_set_status(struct vdpa_device * vdpa_dev,u8 status)196 static 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
ifcvf_vdpa_get_vq_num_max(struct vdpa_device * vdpa_dev)240 static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
241 {
242 return IFCVF_QUEUE_MAX;
243 }
244
ifcvf_vdpa_get_vq_state(struct vdpa_device * vdpa_dev,u16 qid,struct vdpa_vq_state * state)245 static 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
ifcvf_vdpa_set_vq_state(struct vdpa_device * vdpa_dev,u16 qid,const struct vdpa_vq_state * state)254 static 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
ifcvf_vdpa_set_vq_cb(struct vdpa_device * vdpa_dev,u16 qid,struct vdpa_callback * cb)262 static 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
ifcvf_vdpa_set_vq_ready(struct vdpa_device * vdpa_dev,u16 qid,bool ready)270 static 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
ifcvf_vdpa_get_vq_ready(struct vdpa_device * vdpa_dev,u16 qid)278 static 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
ifcvf_vdpa_set_vq_num(struct vdpa_device * vdpa_dev,u16 qid,u32 num)285 static 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
ifcvf_vdpa_set_vq_address(struct vdpa_device * vdpa_dev,u16 qid,u64 desc_area,u64 driver_area,u64 device_area)293 static 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
ifcvf_vdpa_kick_vq(struct vdpa_device * vdpa_dev,u16 qid)306 static 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
ifcvf_vdpa_get_generation(struct vdpa_device * vdpa_dev)313 static 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
ifcvf_vdpa_get_device_id(struct vdpa_device * vdpa_dev)320 static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
321 {
322 return VIRTIO_ID_NET;
323 }
324
ifcvf_vdpa_get_vendor_id(struct vdpa_device * vdpa_dev)325 static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
326 {
327 return IFCVF_SUBSYS_VENDOR_ID;
328 }
329
ifcvf_vdpa_get_vq_align(struct vdpa_device * vdpa_dev)330 static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
331 {
332 return IFCVF_QUEUE_ALIGNMENT;
333 }
334
ifcvf_vdpa_get_config(struct vdpa_device * vdpa_dev,unsigned int offset,void * buf,unsigned int len)335 static 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
ifcvf_vdpa_set_config(struct vdpa_device * vdpa_dev,unsigned int offset,const void * buf,unsigned int len)345 static 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
ifcvf_vdpa_set_config_cb(struct vdpa_device * vdpa_dev,struct vdpa_callback * cb)355 static 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
ifcvf_vdpa_get_vq_irq(struct vdpa_device * vdpa_dev,u16 qid)364 static 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 * IFCVF currently does't have on-chip IOMMU, so not
374 * implemented set_map()/dma_map()/dma_unmap()
375 */
376 static 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
ifcvf_probe(struct pci_dev * pdev,const struct pci_device_id * id)400 static 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 = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
421 if (ret) {
422 IFCVF_ERR(pdev, "No usable DMA confiugration\n");
423 return ret;
424 }
425
426 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
427 if (ret) {
428 IFCVF_ERR(pdev,
429 "No usable coherent DMA confiugration\n");
430 return ret;
431 }
432
433 ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
434 if (ret) {
435 IFCVF_ERR(pdev,
436 "Failed for adding devres for freeing irq vectors\n");
437 return ret;
438 }
439
440 adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
441 dev, &ifc_vdpa_ops,
442 IFCVF_MAX_QUEUE_PAIRS * 2);
443 if (adapter == NULL) {
444 IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
445 return -ENOMEM;
446 }
447
448 pci_set_master(pdev);
449 pci_set_drvdata(pdev, adapter);
450
451 vf = &adapter->vf;
452 vf->base = pcim_iomap_table(pdev);
453
454 adapter->pdev = pdev;
455 adapter->vdpa.dma_dev = &pdev->dev;
456
457 ret = ifcvf_init_hw(vf, pdev);
458 if (ret) {
459 IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
460 goto err;
461 }
462
463 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
464 vf->vring[i].irq = -EINVAL;
465
466 ret = vdpa_register_device(&adapter->vdpa);
467 if (ret) {
468 IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
469 goto err;
470 }
471
472 return 0;
473
474 err:
475 put_device(&adapter->vdpa.dev);
476 return ret;
477 }
478
ifcvf_remove(struct pci_dev * pdev)479 static void ifcvf_remove(struct pci_dev *pdev)
480 {
481 struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);
482
483 vdpa_unregister_device(&adapter->vdpa);
484 }
485
486 static struct pci_device_id ifcvf_pci_ids[] = {
487 { PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
488 IFCVF_DEVICE_ID,
489 IFCVF_SUBSYS_VENDOR_ID,
490 IFCVF_SUBSYS_DEVICE_ID) },
491 { 0 },
492 };
493 MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
494
495 static struct pci_driver ifcvf_driver = {
496 .name = IFCVF_DRIVER_NAME,
497 .id_table = ifcvf_pci_ids,
498 .probe = ifcvf_probe,
499 .remove = ifcvf_remove,
500 };
501
502 module_pci_driver(ifcvf_driver);
503
504 MODULE_LICENSE("GPL v2");
505 MODULE_VERSION(VERSION_STRING);
506