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 "ifcvf_base.h"
 12
 13static inline u8 ifc_ioread8(u8 __iomem *addr)
 14{
 15	return ioread8(addr);
 16}
 17static inline u16 ifc_ioread16 (__le16 __iomem *addr)
 18{
 19	return ioread16(addr);
 20}
 21
 22static inline u32 ifc_ioread32(__le32 __iomem *addr)
 23{
 24	return ioread32(addr);
 25}
 26
 27static inline void ifc_iowrite8(u8 value, u8 __iomem *addr)
 28{
 29	iowrite8(value, addr);
 30}
 31
 32static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr)
 33{
 34	iowrite16(value, addr);
 35}
 36
 37static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr)
 38{
 39	iowrite32(value, addr);
 40}
 41
 42static void ifc_iowrite64_twopart(u64 val,
 43				  __le32 __iomem *lo, __le32 __iomem *hi)
 44{
 45	ifc_iowrite32((u32)val, lo);
 46	ifc_iowrite32(val >> 32, hi);
 47}
 48
 49struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw)
 50{
 51	return container_of(hw, struct ifcvf_adapter, vf);
 52}
 53
 54static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
 55				  struct virtio_pci_cap *cap)
 56{
 57	struct ifcvf_adapter *ifcvf;
 58	struct pci_dev *pdev;
 59	u32 length, offset;
 60	u8 bar;
 61
 62	length = le32_to_cpu(cap->length);
 63	offset = le32_to_cpu(cap->offset);
 64	bar = cap->bar;
 65
 66	ifcvf= vf_to_adapter(hw);
 67	pdev = ifcvf->pdev;
 68
 69	if (bar >= IFCVF_PCI_MAX_RESOURCE) {
 70		IFCVF_DBG(pdev,
 71			  "Invalid bar number %u to get capabilities\n", bar);
 72		return NULL;
 73	}
 74
 75	if (offset + length > pci_resource_len(pdev, bar)) {
 76		IFCVF_DBG(pdev,
 77			  "offset(%u) + len(%u) overflows bar%u's capability\n",
 78			  offset, length, bar);
 79		return NULL;
 80	}
 81
 82	return hw->base[bar] + offset;
 83}
 84
 85static int ifcvf_read_config_range(struct pci_dev *dev,
 86				   uint32_t *val, int size, int where)
 87{
 88	int ret, i;
 89
 90	for (i = 0; i < size; i += 4) {
 91		ret = pci_read_config_dword(dev, where + i, val + i / 4);
 92		if (ret < 0)
 93			return ret;
 94	}
 95
 96	return 0;
 97}
 98
 99int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
100{
101	struct virtio_pci_cap cap;
102	u16 notify_off;
103	int ret;
104	u8 pos;
105	u32 i;
106
107	ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
108	if (ret < 0) {
109		IFCVF_ERR(pdev, "Failed to read PCI capability list\n");
110		return -EIO;
111	}
112
113	while (pos) {
114		ret = ifcvf_read_config_range(pdev, (u32 *)&cap,
115					      sizeof(cap), pos);
116		if (ret < 0) {
117			IFCVF_ERR(pdev,
118				  "Failed to get PCI capability at %x\n", pos);
119			break;
120		}
121
122		if (cap.cap_vndr != PCI_CAP_ID_VNDR)
123			goto next;
124
125		switch (cap.cfg_type) {
126		case VIRTIO_PCI_CAP_COMMON_CFG:
127			hw->common_cfg = get_cap_addr(hw, &cap);
128			IFCVF_DBG(pdev, "hw->common_cfg = %p\n",
129				  hw->common_cfg);
130			break;
131		case VIRTIO_PCI_CAP_NOTIFY_CFG:
132			pci_read_config_dword(pdev, pos + sizeof(cap),
133					      &hw->notify_off_multiplier);
134			hw->notify_bar = cap.bar;
135			hw->notify_base = get_cap_addr(hw, &cap);
136			IFCVF_DBG(pdev, "hw->notify_base = %p\n",
137				  hw->notify_base);
138			break;
139		case VIRTIO_PCI_CAP_ISR_CFG:
140			hw->isr = get_cap_addr(hw, &cap);
141			IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr);
142			break;
143		case VIRTIO_PCI_CAP_DEVICE_CFG:
144			hw->net_cfg = get_cap_addr(hw, &cap);
145			IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg);
146			break;
147		}
148
149next:
150		pos = cap.cap_next;
151	}
152
153	if (hw->common_cfg == NULL || hw->notify_base == NULL ||
154	    hw->isr == NULL || hw->net_cfg == NULL) {
155		IFCVF_ERR(pdev, "Incomplete PCI capabilities\n");
156		return -EIO;
157	}
158
159	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
160		ifc_iowrite16(i, &hw->common_cfg->queue_select);
161		notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off);
162		hw->vring[i].notify_addr = hw->notify_base +
163			notify_off * hw->notify_off_multiplier;
164	}
165
166	hw->lm_cfg = hw->base[IFCVF_LM_BAR];
167
168	IFCVF_DBG(pdev,
169		  "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n",
170		  hw->common_cfg, hw->notify_base, hw->isr,
171		  hw->net_cfg, hw->notify_off_multiplier);
172
173	return 0;
174}
175
176u8 ifcvf_get_status(struct ifcvf_hw *hw)
177{
178	return ifc_ioread8(&hw->common_cfg->device_status);
179}
180
181void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
182{
183	ifc_iowrite8(status, &hw->common_cfg->device_status);
184}
185
186void ifcvf_reset(struct ifcvf_hw *hw)
187{
188	hw->config_cb.callback = NULL;
189	hw->config_cb.private = NULL;
190
191	ifcvf_set_status(hw, 0);
192	/* flush set_status, make sure VF is stopped, reset */
193	ifcvf_get_status(hw);
194}
195
196static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
197{
198	if (status != 0)
199		status |= ifcvf_get_status(hw);
200
201	ifcvf_set_status(hw, status);
202	ifcvf_get_status(hw);
203}
204
205u64 ifcvf_get_features(struct ifcvf_hw *hw)
206{
207	struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
208	u32 features_lo, features_hi;
209
210	ifc_iowrite32(0, &cfg->device_feature_select);
211	features_lo = ifc_ioread32(&cfg->device_feature);
212
213	ifc_iowrite32(1, &cfg->device_feature_select);
214	features_hi = ifc_ioread32(&cfg->device_feature);
215
216	return ((u64)features_hi << 32) | features_lo;
217}
218
219void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
220			   void *dst, int length)
221{
222	u8 old_gen, new_gen, *p;
223	int i;
224
225	WARN_ON(offset + length > sizeof(struct virtio_net_config));
226	do {
227		old_gen = ifc_ioread8(&hw->common_cfg->config_generation);
228		p = dst;
229		for (i = 0; i < length; i++)
230			*p++ = ifc_ioread8(hw->net_cfg + offset + i);
231
232		new_gen = ifc_ioread8(&hw->common_cfg->config_generation);
233	} while (old_gen != new_gen);
234}
235
236void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
237			    const void *src, int length)
238{
239	const u8 *p;
240	int i;
241
242	p = src;
243	WARN_ON(offset + length > sizeof(struct virtio_net_config));
244	for (i = 0; i < length; i++)
245		ifc_iowrite8(*p++, hw->net_cfg + offset + i);
246}
247
248static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
249{
250	struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
251
252	ifc_iowrite32(0, &cfg->guest_feature_select);
253	ifc_iowrite32((u32)features, &cfg->guest_feature);
254
255	ifc_iowrite32(1, &cfg->guest_feature_select);
256	ifc_iowrite32(features >> 32, &cfg->guest_feature);
257}
258
259static int ifcvf_config_features(struct ifcvf_hw *hw)
260{
261	struct ifcvf_adapter *ifcvf;
262
263	ifcvf = vf_to_adapter(hw);
264	ifcvf_set_features(hw, hw->req_features);
265	ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
266
267	if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
268		IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n");
269		return -EIO;
270	}
271
272	return 0;
273}
274
275u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
276{
277	struct ifcvf_lm_cfg __iomem *ifcvf_lm;
278	void __iomem *avail_idx_addr;
279	u16 last_avail_idx;
280	u32 q_pair_id;
281
282	ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
283	q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
284	avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
285	last_avail_idx = ifc_ioread16(avail_idx_addr);
286
287	return last_avail_idx;
288}
289
290int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
291{
292	struct ifcvf_lm_cfg __iomem *ifcvf_lm;
293	void __iomem *avail_idx_addr;
294	u32 q_pair_id;
295
296	ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
297	q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
298	avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
299	hw->vring[qid].last_avail_idx = num;
300	ifc_iowrite16(num, avail_idx_addr);
301
302	return 0;
303}
304
305static int ifcvf_hw_enable(struct ifcvf_hw *hw)
306{
307	struct virtio_pci_common_cfg __iomem *cfg;
308	struct ifcvf_adapter *ifcvf;
309	u32 i;
310
311	ifcvf = vf_to_adapter(hw);
312	cfg = hw->common_cfg;
313	ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
314
315	if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
316		IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n");
317		return -EINVAL;
318	}
319
320	for (i = 0; i < hw->nr_vring; i++) {
321		if (!hw->vring[i].ready)
322			break;
323
324		ifc_iowrite16(i, &cfg->queue_select);
325		ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
326				     &cfg->queue_desc_hi);
327		ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
328				      &cfg->queue_avail_hi);
329		ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
330				     &cfg->queue_used_hi);
331		ifc_iowrite16(hw->vring[i].size, &cfg->queue_size);
332		ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
333
334		if (ifc_ioread16(&cfg->queue_msix_vector) ==
335		    VIRTIO_MSI_NO_VECTOR) {
336			IFCVF_ERR(ifcvf->pdev,
337				  "No msix vector for queue %u\n", i);
338			return -EINVAL;
339		}
340
341		ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx);
342		ifc_iowrite16(1, &cfg->queue_enable);
343	}
344
345	return 0;
346}
347
348static void ifcvf_hw_disable(struct ifcvf_hw *hw)
349{
350	struct virtio_pci_common_cfg __iomem *cfg;
351	u32 i;
352
353	cfg = hw->common_cfg;
354	ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
355
356	for (i = 0; i < hw->nr_vring; i++) {
357		ifc_iowrite16(i, &cfg->queue_select);
358		ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
359	}
360
361	ifc_ioread16(&cfg->queue_msix_vector);
362}
363
364int ifcvf_start_hw(struct ifcvf_hw *hw)
365{
366	ifcvf_reset(hw);
367	ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
368	ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
369
370	if (ifcvf_config_features(hw) < 0)
371		return -EINVAL;
372
373	if (ifcvf_hw_enable(hw) < 0)
374		return -EINVAL;
375
376	ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
377
378	return 0;
379}
380
381void ifcvf_stop_hw(struct ifcvf_hw *hw)
382{
383	ifcvf_hw_disable(hw);
384	ifcvf_reset(hw);
385}
386
387void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
388{
389	ifc_iowrite16(qid, hw->vring[qid].notify_addr);
390}