ifcvf_main.c

  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 DRIVER_AUTHOR   "Intel Corporation"
 18#define IFCVF_DRIVER_NAME       "ifcvf"
 19
 20static irqreturn_t ifcvf_config_changed(int irq, void *arg)
 21{
 22	struct ifcvf_hw *vf = arg;
 23
 24	if (vf->config_cb.callback)
 25		return vf->config_cb.callback(vf->config_cb.private);
 26
 27	return IRQ_HANDLED;
 28}
 29
 30static irqreturn_t ifcvf_vq_intr_handler(int irq, void *arg)
 31{
 32	struct vring_info *vring = arg;
 33
 34	if (vring->cb.callback)
 35		return vring->cb.callback(vring->cb.private);
 36
 37	return IRQ_HANDLED;
 38}
 39
 40static irqreturn_t ifcvf_vqs_reused_intr_handler(int irq, void *arg)
 41{
 42	struct ifcvf_hw *vf = arg;
 43	struct vring_info *vring;
 44	int i;
 45
 46	for (i = 0; i < vf->nr_vring; i++) {
 47		vring = &vf->vring[i];
 48		if (vring->cb.callback)
 49			vring->cb.callback(vring->cb.private);
 50	}
 51
 52	return IRQ_HANDLED;
 53}
 54
 55static irqreturn_t ifcvf_dev_intr_handler(int irq, void *arg)
 56{
 57	struct ifcvf_hw *vf = arg;
 58	u8 isr;
 59
 60	isr = vp_ioread8(vf->isr);
 61	if (isr & VIRTIO_PCI_ISR_CONFIG)
 62		ifcvf_config_changed(irq, arg);
 63
 64	return ifcvf_vqs_reused_intr_handler(irq, arg);
 65}
 66
 67static void ifcvf_free_irq_vectors(void *data)
 68{
 69	pci_free_irq_vectors(data);
 70}
 71
 72static void ifcvf_free_per_vq_irq(struct ifcvf_hw *vf)
 73{
 74	struct pci_dev *pdev = vf->pdev;
 75	int i;
 76
 77	for (i = 0; i < vf->nr_vring; i++) {
 78		if (vf->vring[i].irq != -EINVAL) {
 79			devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
 80			vf->vring[i].irq = -EINVAL;
 81		}
 82	}
 83}
 84
 85static void ifcvf_free_vqs_reused_irq(struct ifcvf_hw *vf)
 86{
 87	struct pci_dev *pdev = vf->pdev;
 88
 89	if (vf->vqs_reused_irq != -EINVAL) {
 90		devm_free_irq(&pdev->dev, vf->vqs_reused_irq, vf);
 91		vf->vqs_reused_irq = -EINVAL;
 92	}
 93
 94}
 95
 96static void ifcvf_free_vq_irq(struct ifcvf_hw *vf)
 97{
 98	if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG)
 99		ifcvf_free_per_vq_irq(vf);
100	else
101		ifcvf_free_vqs_reused_irq(vf);
102}
103
104static void ifcvf_free_config_irq(struct ifcvf_hw *vf)
105{
106	struct pci_dev *pdev = vf->pdev;
107
108	if (vf->config_irq == -EINVAL)
109		return;
110
111	/* If the irq is shared by all vqs and the config interrupt,
112	 * it is already freed in ifcvf_free_vq_irq, so here only
113	 * need to free config irq when msix_vector_status != MSIX_VECTOR_DEV_SHARED
114	 */
115	if (vf->msix_vector_status != MSIX_VECTOR_DEV_SHARED) {
116		devm_free_irq(&pdev->dev, vf->config_irq, vf);
117		vf->config_irq = -EINVAL;
118	}
119}
120
121static void ifcvf_free_irq(struct ifcvf_hw *vf)
122{
123	struct pci_dev *pdev = vf->pdev;
124
125	ifcvf_free_vq_irq(vf);
126	ifcvf_free_config_irq(vf);
127	ifcvf_free_irq_vectors(pdev);
128	vf->num_msix_vectors = 0;
129}
130
131/* ifcvf MSIX vectors allocator, this helper tries to allocate
132 * vectors for all virtqueues and the config interrupt.
133 * It returns the number of allocated vectors, negative
134 * return value when fails.
135 */
136static int ifcvf_alloc_vectors(struct ifcvf_hw *vf)
137{
138	struct pci_dev *pdev = vf->pdev;
139	int max_intr, ret;
140
141	/* all queues and config interrupt  */
142	max_intr = vf->nr_vring + 1;
143	ret = pci_alloc_irq_vectors(pdev, 1, max_intr, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
144
145	if (ret < 0) {
146		IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
147		return ret;
148	}
149
150	if (ret < max_intr)
151		IFCVF_INFO(pdev,
152			   "Requested %u vectors, however only %u allocated, lower performance\n",
153			   max_intr, ret);
154
155	return ret;
156}
157
158static int ifcvf_request_per_vq_irq(struct ifcvf_hw *vf)
159{
160	struct pci_dev *pdev = vf->pdev;
161	int i, vector, ret, irq;
162
163	vf->vqs_reused_irq = -EINVAL;
164	for (i = 0; i < vf->nr_vring; i++) {
165		snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n", pci_name(pdev), i);
166		vector = i;
167		irq = pci_irq_vector(pdev, vector);
168		ret = devm_request_irq(&pdev->dev, irq,
169				       ifcvf_vq_intr_handler, 0,
170				       vf->vring[i].msix_name,
171				       &vf->vring[i]);
172		if (ret) {
173			IFCVF_ERR(pdev, "Failed to request irq for vq %d\n", i);
174			goto err;
175		}
176
177		vf->vring[i].irq = irq;
178		ret = ifcvf_set_vq_vector(vf, i, vector);
179		if (ret == VIRTIO_MSI_NO_VECTOR) {
180			IFCVF_ERR(pdev, "No msix vector for vq %u\n", i);
181			goto err;
182		}
183	}
184
185	return 0;
186err:
187	ifcvf_free_irq(vf);
188
189	return -EFAULT;
190}
191
192static int ifcvf_request_vqs_reused_irq(struct ifcvf_hw *vf)
193{
194	struct pci_dev *pdev = vf->pdev;
195	int i, vector, ret, irq;
196
197	vector = 0;
198	snprintf(vf->vring[0].msix_name, 256, "ifcvf[%s]-vqs-reused-irq\n", pci_name(pdev));
199	irq = pci_irq_vector(pdev, vector);
200	ret = devm_request_irq(&pdev->dev, irq,
201			       ifcvf_vqs_reused_intr_handler, 0,
202			       vf->vring[0].msix_name, vf);
203	if (ret) {
204		IFCVF_ERR(pdev, "Failed to request reused irq for the device\n");
205		goto err;
206	}
207
208	vf->vqs_reused_irq = irq;
209	for (i = 0; i < vf->nr_vring; i++) {
210		vf->vring[i].irq = -EINVAL;
211		ret = ifcvf_set_vq_vector(vf, i, vector);
212		if (ret == VIRTIO_MSI_NO_VECTOR) {
213			IFCVF_ERR(pdev, "No msix vector for vq %u\n", i);
214			goto err;
215		}
216	}
217
218	return 0;
219err:
220	ifcvf_free_irq(vf);
221
222	return -EFAULT;
223}
224
225static int ifcvf_request_dev_irq(struct ifcvf_hw *vf)
226{
227	struct pci_dev *pdev = vf->pdev;
228	int i, vector, ret, irq;
229
230	vector = 0;
231	snprintf(vf->vring[0].msix_name, 256, "ifcvf[%s]-dev-irq\n", pci_name(pdev));
232	irq = pci_irq_vector(pdev, vector);
233	ret = devm_request_irq(&pdev->dev, irq,
234			       ifcvf_dev_intr_handler, 0,
235			       vf->vring[0].msix_name, vf);
236	if (ret) {
237		IFCVF_ERR(pdev, "Failed to request irq for the device\n");
238		goto err;
239	}
240
241	vf->vqs_reused_irq = irq;
242	for (i = 0; i < vf->nr_vring; i++) {
243		vf->vring[i].irq = -EINVAL;
244		ret = ifcvf_set_vq_vector(vf, i, vector);
245		if (ret == VIRTIO_MSI_NO_VECTOR) {
246			IFCVF_ERR(pdev, "No msix vector for vq %u\n", i);
247			goto err;
248		}
249	}
250
251	vf->config_irq = irq;
252	ret = ifcvf_set_config_vector(vf, vector);
253	if (ret == VIRTIO_MSI_NO_VECTOR) {
254		IFCVF_ERR(pdev, "No msix vector for device config\n");
255		goto err;
256	}
257
258	return 0;
259err:
260	ifcvf_free_irq(vf);
261
262	return -EFAULT;
263
264}
265
266static int ifcvf_request_vq_irq(struct ifcvf_hw *vf)
267{
268	int ret;
269
270	if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG)
271		ret = ifcvf_request_per_vq_irq(vf);
272	else
273		ret = ifcvf_request_vqs_reused_irq(vf);
274
275	return ret;
276}
277
278static int ifcvf_request_config_irq(struct ifcvf_hw *vf)
279{
280	struct pci_dev *pdev = vf->pdev;
281	int config_vector, ret;
282
283	if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG)
284		config_vector = vf->nr_vring;
285	else if (vf->msix_vector_status ==  MSIX_VECTOR_SHARED_VQ_AND_CONFIG)
286		/* vector 0 for vqs and 1 for config interrupt */
287		config_vector = 1;
288	else if (vf->msix_vector_status == MSIX_VECTOR_DEV_SHARED)
289		/* re-use the vqs vector */
290		return 0;
291	else
292		return -EINVAL;
293
294	snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
295		 pci_name(pdev));
296	vf->config_irq = pci_irq_vector(pdev, config_vector);
297	ret = devm_request_irq(&pdev->dev, vf->config_irq,
298			       ifcvf_config_changed, 0,
299			       vf->config_msix_name, vf);
300	if (ret) {
301		IFCVF_ERR(pdev, "Failed to request config irq\n");
302		goto err;
303	}
304
305	ret = ifcvf_set_config_vector(vf, config_vector);
306	if (ret == VIRTIO_MSI_NO_VECTOR) {
307		IFCVF_ERR(pdev, "No msix vector for device config\n");
308		goto err;
309	}
310
311	return 0;
312err:
313	ifcvf_free_irq(vf);
314
315	return -EFAULT;
316}
317
318static int ifcvf_request_irq(struct ifcvf_hw *vf)
319{
320	int nvectors, ret, max_intr;
321
322	nvectors = ifcvf_alloc_vectors(vf);
323	if (nvectors <= 0)
324		return -EFAULT;
325
326	vf->msix_vector_status = MSIX_VECTOR_PER_VQ_AND_CONFIG;
327	max_intr = vf->nr_vring + 1;
328	if (nvectors < max_intr)
329		vf->msix_vector_status = MSIX_VECTOR_SHARED_VQ_AND_CONFIG;
330
331	if (nvectors == 1) {
332		vf->msix_vector_status = MSIX_VECTOR_DEV_SHARED;
333		ret = ifcvf_request_dev_irq(vf);
334
335		return ret;
336	}
337
338	ret = ifcvf_request_vq_irq(vf);
339	if (ret)
340		return ret;
341
342	ret = ifcvf_request_config_irq(vf);
343
344	if (ret)
345		return ret;
346
347	vf->num_msix_vectors = nvectors;
348
349	return 0;
350}
351
352static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
353{
354	return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
355}
356
357static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
358{
359	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
360
361	return adapter->vf;
362}
363
364static u64 ifcvf_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
365{
366	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
367	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
368	struct pci_dev *pdev = adapter->pdev;
369	u32 type = vf->dev_type;
370	u64 features;
371
372	if (type == VIRTIO_ID_NET || type == VIRTIO_ID_BLOCK)
373		features = ifcvf_get_dev_features(vf);
374	else {
375		features = 0;
376		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
377	}
378
379	return features;
380}
381
382static int ifcvf_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
383{
384	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
385	int ret;
386
387	ret = ifcvf_verify_min_features(vf, features);
388	if (ret)
389		return ret;
390
391	ifcvf_set_driver_features(vf, features);
392
393	return 0;
394}
395
396static u64 ifcvf_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
397{
398	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
399	u64 features;
400
401	features = ifcvf_get_driver_features(vf);
402
403	return features;
404}
405
406static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
407{
408	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
409
410	return ifcvf_get_status(vf);
411}
412
413static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
414{
415	struct ifcvf_hw *vf;
416	u8 status_old;
417	int ret;
418
419	vf  = vdpa_to_vf(vdpa_dev);
420	status_old = ifcvf_get_status(vf);
421
422	if (status_old == status)
423		return;
424
425	if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
426	    !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
427		ret = ifcvf_request_irq(vf);
428		if (ret) {
429			IFCVF_ERR(vf->pdev, "failed to request irq with error %d\n", ret);
430			return;
431		}
432	}
433
434	ifcvf_set_status(vf, status);
435}
436
437static int ifcvf_vdpa_reset(struct vdpa_device *vdpa_dev)
438{
439	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
440	u8 status = ifcvf_get_status(vf);
441
442	ifcvf_stop(vf);
443
444	if (status & VIRTIO_CONFIG_S_DRIVER_OK)
445		ifcvf_free_irq(vf);
446
447	ifcvf_reset(vf);
448
449	return 0;
450}
451
452static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
453{
454	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
455
456	return ifcvf_get_max_vq_size(vf);
457}
458
459static u16 ifcvf_vdpa_get_vq_num_min(struct vdpa_device *vdpa_dev)
460{
461	return IFCVF_MIN_VQ_SIZE;
462}
463
464static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
465				   struct vdpa_vq_state *state)
466{
467	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
468
469	state->split.avail_index = ifcvf_get_vq_state(vf, qid);
470	return 0;
471}
472
473static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
474				   const struct vdpa_vq_state *state)
475{
476	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
477
478	return ifcvf_set_vq_state(vf, qid, state->split.avail_index);
479}
480
481static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
482				 struct vdpa_callback *cb)
483{
484	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
485
486	vf->vring[qid].cb = *cb;
487}
488
489static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
490				    u16 qid, bool ready)
491{
492	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
493
494	ifcvf_set_vq_ready(vf, qid, ready);
495}
496
497static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
498{
499	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
500
501	return ifcvf_get_vq_ready(vf, qid);
502}
503
504static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
505				  u32 num)
506{
507	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
508
509	ifcvf_set_vq_num(vf, qid, num);
510}
511
512static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
513				     u64 desc_area, u64 driver_area,
514				     u64 device_area)
515{
516	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
517
518	return ifcvf_set_vq_address(vf, qid, desc_area, driver_area, device_area);
519}
520
521static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
522{
523	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
524
525	ifcvf_notify_queue(vf, qid);
526}
527
528static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
529{
530	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
531
532	return vp_ioread8(&vf->common_cfg->config_generation);
533}
534
535static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
536{
537	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
538
539	return vf->dev_type;
540}
541
542static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
543{
544	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
545	struct pci_dev *pdev = adapter->pdev;
546
547	return pdev->subsystem_vendor;
548}
549
550static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
551{
552	return IFCVF_QUEUE_ALIGNMENT;
553}
554
555static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
556{
557	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
558
559	return  vf->config_size;
560}
561
562static u32 ifcvf_vdpa_get_vq_group(struct vdpa_device *vdpa, u16 idx)
563{
564	return 0;
565}
566
567static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
568				  unsigned int offset,
569				  void *buf, unsigned int len)
570{
571	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
572
573	ifcvf_read_dev_config(vf, offset, buf, len);
574}
575
576static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
577				  unsigned int offset, const void *buf,
578				  unsigned int len)
579{
580	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
581
582	ifcvf_write_dev_config(vf, offset, buf, len);
583}
584
585static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
586				     struct vdpa_callback *cb)
587{
588	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
589
590	vf->config_cb.callback = cb->callback;
591	vf->config_cb.private = cb->private;
592}
593
594static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
595				 u16 qid)
596{
597	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
598
599	if (vf->vqs_reused_irq < 0)
600		return vf->vring[qid].irq;
601	else
602		return -EINVAL;
603}
604
605static u16 ifcvf_vdpa_get_vq_size(struct vdpa_device *vdpa_dev,
606			     u16 qid)
607{
608	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
609
610	return ifcvf_get_vq_size(vf, qid);
611}
612
613static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev,
614							       u16 idx)
615{
616	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
617	struct vdpa_notification_area area;
618
619	area.addr = vf->vring[idx].notify_pa;
620	if (!vf->notify_off_multiplier)
621		area.size = PAGE_SIZE;
622	else
623		area.size = vf->notify_off_multiplier;
624
625	return area;
626}
627
628/*
629 * IFCVF currently doesn't have on-chip IOMMU, so not
630 * implemented set_map()/dma_map()/dma_unmap()
631 */
632static const struct vdpa_config_ops ifc_vdpa_ops = {
633	.get_device_features = ifcvf_vdpa_get_device_features,
634	.set_driver_features = ifcvf_vdpa_set_driver_features,
635	.get_driver_features = ifcvf_vdpa_get_driver_features,
636	.get_status	= ifcvf_vdpa_get_status,
637	.set_status	= ifcvf_vdpa_set_status,
638	.reset		= ifcvf_vdpa_reset,
639	.get_vq_num_max	= ifcvf_vdpa_get_vq_num_max,
640	.get_vq_num_min	= ifcvf_vdpa_get_vq_num_min,
641	.get_vq_state	= ifcvf_vdpa_get_vq_state,
642	.set_vq_state	= ifcvf_vdpa_set_vq_state,
643	.set_vq_cb	= ifcvf_vdpa_set_vq_cb,
644	.set_vq_ready	= ifcvf_vdpa_set_vq_ready,
645	.get_vq_ready	= ifcvf_vdpa_get_vq_ready,
646	.set_vq_num	= ifcvf_vdpa_set_vq_num,
647	.set_vq_address	= ifcvf_vdpa_set_vq_address,
648	.get_vq_irq	= ifcvf_vdpa_get_vq_irq,
649	.get_vq_size	= ifcvf_vdpa_get_vq_size,
650	.kick_vq	= ifcvf_vdpa_kick_vq,
651	.get_generation	= ifcvf_vdpa_get_generation,
652	.get_device_id	= ifcvf_vdpa_get_device_id,
653	.get_vendor_id	= ifcvf_vdpa_get_vendor_id,
654	.get_vq_align	= ifcvf_vdpa_get_vq_align,
655	.get_vq_group	= ifcvf_vdpa_get_vq_group,
656	.get_config_size	= ifcvf_vdpa_get_config_size,
657	.get_config	= ifcvf_vdpa_get_config,
658	.set_config	= ifcvf_vdpa_set_config,
659	.set_config_cb  = ifcvf_vdpa_set_config_cb,
660	.get_vq_notification = ifcvf_get_vq_notification,
661};
662
663static struct virtio_device_id id_table_net[] = {
664	{VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
665	{0},
666};
667
668static struct virtio_device_id id_table_blk[] = {
669	{VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID},
670	{0},
671};
672
673static u32 get_dev_type(struct pci_dev *pdev)
674{
675	u32 dev_type;
676
677	/* This drirver drives both modern virtio devices and transitional
678	 * devices in modern mode.
679	 * vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM,
680	 * so legacy devices and transitional devices in legacy
681	 * mode will not work for vDPA, this driver will not
682	 * drive devices with legacy interface.
683	 */
684
685	if (pdev->device < 0x1040)
686		dev_type =  pdev->subsystem_device;
687	else
688		dev_type =  pdev->device - 0x1040;
689
690	return dev_type;
691}
692
693static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
694			      const struct vdpa_dev_set_config *config)
695{
696	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
697	struct ifcvf_adapter *adapter;
698	struct vdpa_device *vdpa_dev;
699	struct pci_dev *pdev;
700	struct ifcvf_hw *vf;
701	u64 device_features;
702	int ret;
703
704	ifcvf_mgmt_dev = container_of(mdev, struct ifcvf_vdpa_mgmt_dev, mdev);
705	vf = &ifcvf_mgmt_dev->vf;
706	pdev = vf->pdev;
707	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
708				    &pdev->dev, &ifc_vdpa_ops,
709				    NULL, 1, 1, NULL, false);
710	if (IS_ERR(adapter)) {
711		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
712		return PTR_ERR(adapter);
713	}
714
715	ifcvf_mgmt_dev->adapter = adapter;
716	adapter->pdev = pdev;
717	adapter->vdpa.vmap.dma_dev = &pdev->dev;
718	adapter->vdpa.mdev = mdev;
719	adapter->vf = vf;
720	vdpa_dev = &adapter->vdpa;
721
722	device_features = vf->hw_features;
723	if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
724		if (config->device_features & ~device_features) {
725			IFCVF_ERR(pdev, "The provisioned features 0x%llx are not supported by this device with features 0x%llx\n",
726				  config->device_features, device_features);
727			return -EINVAL;
728		}
729		device_features &= config->device_features;
730	}
731	vf->dev_features = device_features;
732
733	if (name)
734		ret = dev_set_name(&vdpa_dev->dev, "%s", name);
735	else
736		ret = dev_set_name(&vdpa_dev->dev, "vdpa%u", vdpa_dev->index);
737
738	ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring);
739	if (ret) {
740		put_device(&adapter->vdpa.dev);
741		IFCVF_ERR(pdev, "Failed to register to vDPA bus");
742		return ret;
743	}
744
745	return 0;
746}
747
748static void ifcvf_vdpa_dev_del(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev)
749{
750	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
751
752	ifcvf_mgmt_dev = container_of(mdev, struct ifcvf_vdpa_mgmt_dev, mdev);
753	_vdpa_unregister_device(dev);
754	ifcvf_mgmt_dev->adapter = NULL;
755}
756
757static const struct vdpa_mgmtdev_ops ifcvf_vdpa_mgmt_dev_ops = {
758	.dev_add = ifcvf_vdpa_dev_add,
759	.dev_del = ifcvf_vdpa_dev_del
760};
761
762static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
763{
764	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
765	struct device *dev = &pdev->dev;
766	struct ifcvf_hw *vf;
767	u32 dev_type;
768	int ret, i;
769
770	ret = pcim_enable_device(pdev);
771	if (ret) {
772		IFCVF_ERR(pdev, "Failed to enable device\n");
773		return ret;
774	}
775	ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
776				 IFCVF_DRIVER_NAME);
777	if (ret) {
778		IFCVF_ERR(pdev, "Failed to request MMIO region\n");
779		return ret;
780	}
781
782	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
783	if (ret) {
784		IFCVF_ERR(pdev, "No usable DMA configuration\n");
785		return ret;
786	}
787
788	ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
789	if (ret) {
790		IFCVF_ERR(pdev,
791			  "Failed for adding devres for freeing irq vectors\n");
792		return ret;
793	}
794
795	pci_set_master(pdev);
796	ifcvf_mgmt_dev = kzalloc(sizeof(struct ifcvf_vdpa_mgmt_dev), GFP_KERNEL);
797	if (!ifcvf_mgmt_dev) {
798		IFCVF_ERR(pdev, "Failed to alloc memory for the vDPA management device\n");
799		return -ENOMEM;
800	}
801
802	vf = &ifcvf_mgmt_dev->vf;
803	vf->dev_type = get_dev_type(pdev);
804	vf->base = pcim_iomap_table(pdev);
805	vf->pdev = pdev;
806
807	ret = ifcvf_init_hw(vf, pdev);
808	if (ret) {
809		IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
810		goto err;
811	}
812
813	for (i = 0; i < vf->nr_vring; i++)
814		vf->vring[i].irq = -EINVAL;
815
816	vf->hw_features = ifcvf_get_hw_features(vf);
817	vf->config_size = ifcvf_get_config_size(vf);
818
819	dev_type = get_dev_type(pdev);
820	switch (dev_type) {
821	case VIRTIO_ID_NET:
822		ifcvf_mgmt_dev->mdev.id_table = id_table_net;
823		break;
824	case VIRTIO_ID_BLOCK:
825		ifcvf_mgmt_dev->mdev.id_table = id_table_blk;
826		break;
827	default:
828		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", dev_type);
829		ret = -EOPNOTSUPP;
830		goto err;
831	}
832
833	ifcvf_mgmt_dev->mdev.ops = &ifcvf_vdpa_mgmt_dev_ops;
834	ifcvf_mgmt_dev->mdev.device = dev;
835	ifcvf_mgmt_dev->mdev.max_supported_vqs = vf->nr_vring;
836	ifcvf_mgmt_dev->mdev.supported_features = vf->hw_features;
837	ifcvf_mgmt_dev->mdev.config_attr_mask = (1 << VDPA_ATTR_DEV_FEATURES);
838
839	ret = vdpa_mgmtdev_register(&ifcvf_mgmt_dev->mdev);
840	if (ret) {
841		IFCVF_ERR(pdev,
842			  "Failed to initialize the management interfaces\n");
843		goto err;
844	}
845
846	pci_set_drvdata(pdev, ifcvf_mgmt_dev);
847
848	return 0;
849
850err:
851	kfree(ifcvf_mgmt_dev->vf.vring);
852	kfree(ifcvf_mgmt_dev);
853	return ret;
854}
855
856static void ifcvf_remove(struct pci_dev *pdev)
857{
858	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
859
860	ifcvf_mgmt_dev = pci_get_drvdata(pdev);
861	vdpa_mgmtdev_unregister(&ifcvf_mgmt_dev->mdev);
862	kfree(ifcvf_mgmt_dev->vf.vring);
863	kfree(ifcvf_mgmt_dev);
864}
865
866static struct pci_device_id ifcvf_pci_ids[] = {
867	/* N3000 network device */
868	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
869			 N3000_DEVICE_ID,
870			 PCI_VENDOR_ID_INTEL,
871			 N3000_SUBSYS_DEVICE_ID) },
872	/* C5000X-PL network device
873	 * F2000X-PL network device
874	 */
875	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
876			 VIRTIO_TRANS_ID_NET,
877			 PCI_VENDOR_ID_INTEL,
878			 VIRTIO_ID_NET) },
879	/* C5000X-PL block device */
880	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
881			 VIRTIO_TRANS_ID_BLOCK,
882			 PCI_VENDOR_ID_INTEL,
883			 VIRTIO_ID_BLOCK) },
884
885	{ 0 },
886};
887MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
888
889static struct pci_driver ifcvf_driver = {
890	.name     = IFCVF_DRIVER_NAME,
891	.id_table = ifcvf_pci_ids,
892	.probe    = ifcvf_probe,
893	.remove   = ifcvf_remove,
894};
895
896module_pci_driver(ifcvf_driver);
897
898MODULE_DESCRIPTION("Intel IFC VF NIC driver for virtio dataplane offloading");
899MODULE_LICENSE("GPL v2");