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
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 * IFCVF currently does't have on-chip IOMMU, so not
374 * implemented set_map()/dma_map()/dma_unmap()
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 = 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
474err:
475	put_device(&adapter->vdpa.dev);
476	return ret;
477}
478
479static 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
486static 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};
493MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);
494
495static 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
502module_pci_driver(ifcvf_driver);
503
504MODULE_LICENSE("GPL v2");
505MODULE_VERSION(VERSION_STRING);
506