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 hw->notify_base_pa = pci_resource_start(pdev, cap.bar) + 137 le32_to_cpu(cap.offset); 138 IFCVF_DBG(pdev, "hw->notify_base = %p\n", 139 hw->notify_base); 140 break; 141 case VIRTIO_PCI_CAP_ISR_CFG: 142 hw->isr = get_cap_addr(hw, &cap); 143 IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr); 144 break; 145 case VIRTIO_PCI_CAP_DEVICE_CFG: 146 hw->net_cfg = get_cap_addr(hw, &cap); 147 IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg); 148 break; 149 } 150 151 next: 152 pos = cap.cap_next; 153 } 154 155 if (hw->common_cfg == NULL || hw->notify_base == NULL || 156 hw->isr == NULL || hw->net_cfg == NULL) { 157 IFCVF_ERR(pdev, "Incomplete PCI capabilities\n"); 158 return -EIO; 159 } 160 161 hw->nr_vring = ifc_ioread16(&hw->common_cfg->num_queues); 162 163 for (i = 0; i < hw->nr_vring; i++) { 164 ifc_iowrite16(i, &hw->common_cfg->queue_select); 165 notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off); 166 hw->vring[i].notify_addr = hw->notify_base + 167 notify_off * hw->notify_off_multiplier; 168 hw->vring[i].notify_pa = hw->notify_base_pa + 169 notify_off * hw->notify_off_multiplier; 170 } 171 172 hw->lm_cfg = hw->base[IFCVF_LM_BAR]; 173 174 IFCVF_DBG(pdev, 175 "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n", 176 hw->common_cfg, hw->notify_base, hw->isr, 177 hw->net_cfg, hw->notify_off_multiplier); 178 179 return 0; 180 } 181 182 u8 ifcvf_get_status(struct ifcvf_hw *hw) 183 { 184 return ifc_ioread8(&hw->common_cfg->device_status); 185 } 186 187 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status) 188 { 189 ifc_iowrite8(status, &hw->common_cfg->device_status); 190 } 191 192 void ifcvf_reset(struct ifcvf_hw *hw) 193 { 194 hw->config_cb.callback = NULL; 195 hw->config_cb.private = NULL; 196 197 ifcvf_set_status(hw, 0); 198 /* flush set_status, make sure VF is stopped, reset */ 199 ifcvf_get_status(hw); 200 } 201 202 static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status) 203 { 204 if (status != 0) 205 status |= ifcvf_get_status(hw); 206 207 ifcvf_set_status(hw, status); 208 ifcvf_get_status(hw); 209 } 210 211 u64 ifcvf_get_hw_features(struct ifcvf_hw *hw) 212 { 213 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; 214 u32 features_lo, features_hi; 215 u64 features; 216 217 ifc_iowrite32(0, &cfg->device_feature_select); 218 features_lo = ifc_ioread32(&cfg->device_feature); 219 220 ifc_iowrite32(1, &cfg->device_feature_select); 221 features_hi = ifc_ioread32(&cfg->device_feature); 222 223 features = ((u64)features_hi << 32) | features_lo; 224 225 return features; 226 } 227 228 u64 ifcvf_get_features(struct ifcvf_hw *hw) 229 { 230 return hw->hw_features; 231 } 232 233 int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features) 234 { 235 struct ifcvf_adapter *ifcvf = vf_to_adapter(hw); 236 237 if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) { 238 IFCVF_ERR(ifcvf->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n"); 239 return -EINVAL; 240 } 241 242 return 0; 243 } 244 245 void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset, 246 void *dst, int length) 247 { 248 u8 old_gen, new_gen, *p; 249 int i; 250 251 WARN_ON(offset + length > sizeof(struct virtio_net_config)); 252 do { 253 old_gen = ifc_ioread8(&hw->common_cfg->config_generation); 254 p = dst; 255 for (i = 0; i < length; i++) 256 *p++ = ifc_ioread8(hw->net_cfg + offset + i); 257 258 new_gen = ifc_ioread8(&hw->common_cfg->config_generation); 259 } while (old_gen != new_gen); 260 } 261 262 void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset, 263 const void *src, int length) 264 { 265 const u8 *p; 266 int i; 267 268 p = src; 269 WARN_ON(offset + length > sizeof(struct virtio_net_config)); 270 for (i = 0; i < length; i++) 271 ifc_iowrite8(*p++, hw->net_cfg + offset + i); 272 } 273 274 static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features) 275 { 276 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; 277 278 ifc_iowrite32(0, &cfg->guest_feature_select); 279 ifc_iowrite32((u32)features, &cfg->guest_feature); 280 281 ifc_iowrite32(1, &cfg->guest_feature_select); 282 ifc_iowrite32(features >> 32, &cfg->guest_feature); 283 } 284 285 static int ifcvf_config_features(struct ifcvf_hw *hw) 286 { 287 struct ifcvf_adapter *ifcvf; 288 289 ifcvf = vf_to_adapter(hw); 290 ifcvf_set_features(hw, hw->req_features); 291 ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK); 292 293 if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) { 294 IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n"); 295 return -EIO; 296 } 297 298 return 0; 299 } 300 301 u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid) 302 { 303 struct ifcvf_lm_cfg __iomem *ifcvf_lm; 304 void __iomem *avail_idx_addr; 305 u16 last_avail_idx; 306 u32 q_pair_id; 307 308 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg; 309 q_pair_id = qid / hw->nr_vring; 310 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2]; 311 last_avail_idx = ifc_ioread16(avail_idx_addr); 312 313 return last_avail_idx; 314 } 315 316 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num) 317 { 318 struct ifcvf_lm_cfg __iomem *ifcvf_lm; 319 void __iomem *avail_idx_addr; 320 u32 q_pair_id; 321 322 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg; 323 q_pair_id = qid / hw->nr_vring; 324 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2]; 325 hw->vring[qid].last_avail_idx = num; 326 ifc_iowrite16(num, avail_idx_addr); 327 328 return 0; 329 } 330 331 static int ifcvf_hw_enable(struct ifcvf_hw *hw) 332 { 333 struct virtio_pci_common_cfg __iomem *cfg; 334 struct ifcvf_adapter *ifcvf; 335 u32 i; 336 337 ifcvf = vf_to_adapter(hw); 338 cfg = hw->common_cfg; 339 ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config); 340 341 if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) { 342 IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n"); 343 return -EINVAL; 344 } 345 346 for (i = 0; i < hw->nr_vring; i++) { 347 if (!hw->vring[i].ready) 348 break; 349 350 ifc_iowrite16(i, &cfg->queue_select); 351 ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo, 352 &cfg->queue_desc_hi); 353 ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo, 354 &cfg->queue_avail_hi); 355 ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo, 356 &cfg->queue_used_hi); 357 ifc_iowrite16(hw->vring[i].size, &cfg->queue_size); 358 ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector); 359 360 if (ifc_ioread16(&cfg->queue_msix_vector) == 361 VIRTIO_MSI_NO_VECTOR) { 362 IFCVF_ERR(ifcvf->pdev, 363 "No msix vector for queue %u\n", i); 364 return -EINVAL; 365 } 366 367 ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx); 368 ifc_iowrite16(1, &cfg->queue_enable); 369 } 370 371 return 0; 372 } 373 374 static void ifcvf_hw_disable(struct ifcvf_hw *hw) 375 { 376 struct virtio_pci_common_cfg __iomem *cfg; 377 u32 i; 378 379 cfg = hw->common_cfg; 380 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config); 381 382 for (i = 0; i < hw->nr_vring; i++) { 383 ifc_iowrite16(i, &cfg->queue_select); 384 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector); 385 } 386 387 ifc_ioread16(&cfg->queue_msix_vector); 388 } 389 390 int ifcvf_start_hw(struct ifcvf_hw *hw) 391 { 392 ifcvf_reset(hw); 393 ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE); 394 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER); 395 396 if (ifcvf_config_features(hw) < 0) 397 return -EINVAL; 398 399 if (ifcvf_hw_enable(hw) < 0) 400 return -EINVAL; 401 402 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK); 403 404 return 0; 405 } 406 407 void ifcvf_stop_hw(struct ifcvf_hw *hw) 408 { 409 ifcvf_hw_disable(hw); 410 ifcvf_reset(hw); 411 } 412 413 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid) 414 { 415 ifc_iowrite16(qid, hw->vring[qid].notify_addr); 416 } 417