1 // SPDX-License-Identifier: GPL-2.0-only
3 * Intel IFC VF NIC driver for virtio dataplane offloading
5 * Copyright (C) 2020 Intel Corporation.
7 * Author: Zhu Lingshan <lingshan.zhu@intel.com>
11 #include "ifcvf_base.h"
13 static inline u8 ifc_ioread8(u8 __iomem *addr)
17 static inline u16 ifc_ioread16 (__le16 __iomem *addr)
19 return ioread16(addr);
22 static inline u32 ifc_ioread32(__le32 __iomem *addr)
24 return ioread32(addr);
27 static inline void ifc_iowrite8(u8 value, u8 __iomem *addr)
29 iowrite8(value, addr);
32 static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr)
34 iowrite16(value, addr);
37 static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr)
39 iowrite32(value, addr);
42 static void ifc_iowrite64_twopart(u64 val,
43 __le32 __iomem *lo, __le32 __iomem *hi)
45 ifc_iowrite32((u32)val, lo);
46 ifc_iowrite32(val >> 32, hi);
49 struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw)
51 return container_of(hw, struct ifcvf_adapter, vf);
54 static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
55 struct virtio_pci_cap *cap)
57 struct ifcvf_adapter *ifcvf;
62 length = le32_to_cpu(cap->length);
63 offset = le32_to_cpu(cap->offset);
66 ifcvf= vf_to_adapter(hw);
69 if (bar >= IFCVF_PCI_MAX_RESOURCE) {
71 "Invalid bar number %u to get capabilities\n", bar);
75 if (offset + length > pci_resource_len(pdev, bar)) {
77 "offset(%u) + len(%u) overflows bar%u's capability\n",
82 return hw->base[bar] + offset;
85 static int ifcvf_read_config_range(struct pci_dev *dev,
86 uint32_t *val, int size, int where)
90 for (i = 0; i < size; i += 4) {
91 ret = pci_read_config_dword(dev, where + i, val + i / 4);
99 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
101 struct virtio_pci_cap cap;
107 ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
109 IFCVF_ERR(pdev, "Failed to read PCI capability list\n");
114 ret = ifcvf_read_config_range(pdev, (u32 *)&cap,
118 "Failed to get PCI capability at %x\n", pos);
122 if (cap.cap_vndr != PCI_CAP_ID_VNDR)
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",
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",
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);
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);
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");
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;
166 hw->lm_cfg = hw->base[IFCVF_LM_BAR];
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);
176 u8 ifcvf_get_status(struct ifcvf_hw *hw)
178 return ifc_ioread8(&hw->common_cfg->device_status);
181 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
183 ifc_iowrite8(status, &hw->common_cfg->device_status);
186 void ifcvf_reset(struct ifcvf_hw *hw)
188 ifcvf_set_status(hw, 0);
189 /* flush set_status, make sure VF is stopped, reset */
190 ifcvf_get_status(hw);
193 static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
196 status |= ifcvf_get_status(hw);
198 ifcvf_set_status(hw, status);
199 ifcvf_get_status(hw);
202 u64 ifcvf_get_features(struct ifcvf_hw *hw)
204 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
205 u32 features_lo, features_hi;
207 ifc_iowrite32(0, &cfg->device_feature_select);
208 features_lo = ifc_ioread32(&cfg->device_feature);
210 ifc_iowrite32(1, &cfg->device_feature_select);
211 features_hi = ifc_ioread32(&cfg->device_feature);
213 return ((u64)features_hi << 32) | features_lo;
216 void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
217 void *dst, int length)
219 u8 old_gen, new_gen, *p;
222 WARN_ON(offset + length > sizeof(struct virtio_net_config));
224 old_gen = ifc_ioread8(&hw->common_cfg->config_generation);
226 for (i = 0; i < length; i++)
227 *p++ = ifc_ioread8(hw->net_cfg + offset + i);
229 new_gen = ifc_ioread8(&hw->common_cfg->config_generation);
230 } while (old_gen != new_gen);
233 void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
234 const void *src, int length)
240 WARN_ON(offset + length > sizeof(struct virtio_net_config));
241 for (i = 0; i < length; i++)
242 ifc_iowrite8(*p++, hw->net_cfg + offset + i);
245 static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
247 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
249 ifc_iowrite32(0, &cfg->guest_feature_select);
250 ifc_iowrite32((u32)features, &cfg->guest_feature);
252 ifc_iowrite32(1, &cfg->guest_feature_select);
253 ifc_iowrite32(features >> 32, &cfg->guest_feature);
256 static int ifcvf_config_features(struct ifcvf_hw *hw)
258 struct ifcvf_adapter *ifcvf;
260 ifcvf = vf_to_adapter(hw);
261 ifcvf_set_features(hw, hw->req_features);
262 ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
264 if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
265 IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n");
272 u64 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
274 struct ifcvf_lm_cfg __iomem *ifcvf_lm;
275 void __iomem *avail_idx_addr;
279 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
280 q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
281 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
282 last_avail_idx = ifc_ioread16(avail_idx_addr);
284 return last_avail_idx;
287 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u64 num)
289 struct ifcvf_lm_cfg __iomem *ifcvf_lm;
290 void __iomem *avail_idx_addr;
293 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
294 q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
295 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
296 hw->vring[qid].last_avail_idx = num;
297 ifc_iowrite16(num, avail_idx_addr);
302 static int ifcvf_hw_enable(struct ifcvf_hw *hw)
304 struct virtio_pci_common_cfg __iomem *cfg;
305 struct ifcvf_adapter *ifcvf;
308 ifcvf = vf_to_adapter(hw);
309 cfg = hw->common_cfg;
310 ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
312 if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
313 IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n");
317 for (i = 0; i < hw->nr_vring; i++) {
318 if (!hw->vring[i].ready)
321 ifc_iowrite16(i, &cfg->queue_select);
322 ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
323 &cfg->queue_desc_hi);
324 ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
325 &cfg->queue_avail_hi);
326 ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
327 &cfg->queue_used_hi);
328 ifc_iowrite16(hw->vring[i].size, &cfg->queue_size);
329 ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
331 if (ifc_ioread16(&cfg->queue_msix_vector) ==
332 VIRTIO_MSI_NO_VECTOR) {
333 IFCVF_ERR(ifcvf->pdev,
334 "No msix vector for queue %u\n", i);
338 ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx);
339 ifc_iowrite16(1, &cfg->queue_enable);
345 static void ifcvf_hw_disable(struct ifcvf_hw *hw)
347 struct virtio_pci_common_cfg __iomem *cfg;
350 cfg = hw->common_cfg;
351 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
353 for (i = 0; i < hw->nr_vring; i++) {
354 ifc_iowrite16(i, &cfg->queue_select);
355 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
358 ifc_ioread16(&cfg->queue_msix_vector);
361 int ifcvf_start_hw(struct ifcvf_hw *hw)
364 ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
365 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
367 if (ifcvf_config_features(hw) < 0)
370 if (ifcvf_hw_enable(hw) < 0)
373 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
378 void ifcvf_stop_hw(struct ifcvf_hw *hw)
380 ifcvf_hw_disable(hw);
384 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
386 ifc_iowrite16(qid, hw->vring[qid].notify_addr);