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 13 static inline u8 ifc_ioread8(u8 __iomem *addr) 14 { 15 return ioread8(addr); 16 } 17 static inline u16 ifc_ioread16 (__le16 __iomem *addr) 18 { 19 return ioread16(addr); 20 } 21 22 static inline u32 ifc_ioread32(__le32 __iomem *addr) 23 { 24 return ioread32(addr); 25 } 26 27 static inline void ifc_iowrite8(u8 value, u8 __iomem *addr) 28 { 29 iowrite8(value, addr); 30 } 31 32 static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr) 33 { 34 iowrite16(value, addr); 35 } 36 37 static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr) 38 { 39 iowrite32(value, addr); 40 } 41 42 static 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 49 struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw) 50 { 51 return container_of(hw, struct ifcvf_adapter, vf); 52 } 53 54 static 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 85 static 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 99 int 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 } 148 149 next: 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 } 175 176 u8 ifcvf_get_status(struct ifcvf_hw *hw) 177 { 178 return ifc_ioread8(&hw->common_cfg->device_status); 179 } 180 181 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status) 182 { 183 ifc_iowrite8(status, &hw->common_cfg->device_status); 184 } 185 186 void 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 } 195 196 static 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 } 204 205 u64 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 } 218 219 void 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 } 235 236 void 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 } 247 248 static 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 } 258 259 static 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 } 274 275 u16 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 } 289 290 int 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 } 304 305 static 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 } 347 348 static 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 } 363 364 int 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 } 380 381 void ifcvf_stop_hw(struct ifcvf_hw *hw) 382 { 383 ifcvf_hw_disable(hw); 384 ifcvf_reset(hw); 385 } 386 387 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid) 388 { 389 ifc_iowrite16(qid, hw->vring[qid].notify_addr); 390 } 391