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 struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw) 14 { 15 return container_of(hw, struct ifcvf_adapter, vf); 16 } 17 18 u16 ifcvf_set_vq_vector(struct ifcvf_hw *hw, u16 qid, int vector) 19 { 20 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; 21 22 vp_iowrite16(qid, &cfg->queue_select); 23 vp_iowrite16(vector, &cfg->queue_msix_vector); 24 25 return vp_ioread16(&cfg->queue_msix_vector); 26 } 27 28 u16 ifcvf_set_config_vector(struct ifcvf_hw *hw, int vector) 29 { 30 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; 31 32 vp_iowrite16(vector, &cfg->msix_config); 33 34 return vp_ioread16(&cfg->msix_config); 35 } 36 37 static void __iomem *get_cap_addr(struct ifcvf_hw *hw, 38 struct virtio_pci_cap *cap) 39 { 40 struct ifcvf_adapter *ifcvf; 41 struct pci_dev *pdev; 42 u32 length, offset; 43 u8 bar; 44 45 length = le32_to_cpu(cap->length); 46 offset = le32_to_cpu(cap->offset); 47 bar = cap->bar; 48 49 ifcvf= vf_to_adapter(hw); 50 pdev = ifcvf->pdev; 51 52 if (bar >= IFCVF_PCI_MAX_RESOURCE) { 53 IFCVF_DBG(pdev, 54 "Invalid bar number %u to get capabilities\n", bar); 55 return NULL; 56 } 57 58 if (offset + length > pci_resource_len(pdev, bar)) { 59 IFCVF_DBG(pdev, 60 "offset(%u) + len(%u) overflows bar%u's capability\n", 61 offset, length, bar); 62 return NULL; 63 } 64 65 return hw->base[bar] + offset; 66 } 67 68 static int ifcvf_read_config_range(struct pci_dev *dev, 69 uint32_t *val, int size, int where) 70 { 71 int ret, i; 72 73 for (i = 0; i < size; i += 4) { 74 ret = pci_read_config_dword(dev, where + i, val + i / 4); 75 if (ret < 0) 76 return ret; 77 } 78 79 return 0; 80 } 81 82 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev) 83 { 84 struct virtio_pci_cap cap; 85 u16 notify_off; 86 int ret; 87 u8 pos; 88 u32 i; 89 90 ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos); 91 if (ret < 0) { 92 IFCVF_ERR(pdev, "Failed to read PCI capability list\n"); 93 return -EIO; 94 } 95 96 while (pos) { 97 ret = ifcvf_read_config_range(pdev, (u32 *)&cap, 98 sizeof(cap), pos); 99 if (ret < 0) { 100 IFCVF_ERR(pdev, 101 "Failed to get PCI capability at %x\n", pos); 102 break; 103 } 104 105 if (cap.cap_vndr != PCI_CAP_ID_VNDR) 106 goto next; 107 108 switch (cap.cfg_type) { 109 case VIRTIO_PCI_CAP_COMMON_CFG: 110 hw->common_cfg = get_cap_addr(hw, &cap); 111 IFCVF_DBG(pdev, "hw->common_cfg = %p\n", 112 hw->common_cfg); 113 break; 114 case VIRTIO_PCI_CAP_NOTIFY_CFG: 115 pci_read_config_dword(pdev, pos + sizeof(cap), 116 &hw->notify_off_multiplier); 117 hw->notify_bar = cap.bar; 118 hw->notify_base = get_cap_addr(hw, &cap); 119 hw->notify_base_pa = pci_resource_start(pdev, cap.bar) + 120 le32_to_cpu(cap.offset); 121 IFCVF_DBG(pdev, "hw->notify_base = %p\n", 122 hw->notify_base); 123 break; 124 case VIRTIO_PCI_CAP_ISR_CFG: 125 hw->isr = get_cap_addr(hw, &cap); 126 IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr); 127 break; 128 case VIRTIO_PCI_CAP_DEVICE_CFG: 129 hw->dev_cfg = get_cap_addr(hw, &cap); 130 hw->cap_dev_config_size = le32_to_cpu(cap.length); 131 IFCVF_DBG(pdev, "hw->dev_cfg = %p\n", hw->dev_cfg); 132 break; 133 } 134 135 next: 136 pos = cap.cap_next; 137 } 138 139 if (hw->common_cfg == NULL || hw->notify_base == NULL || 140 hw->isr == NULL || hw->dev_cfg == NULL) { 141 IFCVF_ERR(pdev, "Incomplete PCI capabilities\n"); 142 return -EIO; 143 } 144 145 hw->nr_vring = vp_ioread16(&hw->common_cfg->num_queues); 146 147 for (i = 0; i < hw->nr_vring; i++) { 148 vp_iowrite16(i, &hw->common_cfg->queue_select); 149 notify_off = vp_ioread16(&hw->common_cfg->queue_notify_off); 150 hw->vring[i].notify_addr = hw->notify_base + 151 notify_off * hw->notify_off_multiplier; 152 hw->vring[i].notify_pa = hw->notify_base_pa + 153 notify_off * hw->notify_off_multiplier; 154 hw->vring[i].irq = -EINVAL; 155 } 156 157 hw->lm_cfg = hw->base[IFCVF_LM_BAR]; 158 159 IFCVF_DBG(pdev, 160 "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n", 161 hw->common_cfg, hw->notify_base, hw->isr, 162 hw->dev_cfg, hw->notify_off_multiplier); 163 164 hw->vqs_reused_irq = -EINVAL; 165 hw->config_irq = -EINVAL; 166 167 return 0; 168 } 169 170 u8 ifcvf_get_status(struct ifcvf_hw *hw) 171 { 172 return vp_ioread8(&hw->common_cfg->device_status); 173 } 174 175 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status) 176 { 177 vp_iowrite8(status, &hw->common_cfg->device_status); 178 } 179 180 void ifcvf_reset(struct ifcvf_hw *hw) 181 { 182 hw->config_cb.callback = NULL; 183 hw->config_cb.private = NULL; 184 185 ifcvf_set_status(hw, 0); 186 /* flush set_status, make sure VF is stopped, reset */ 187 ifcvf_get_status(hw); 188 } 189 190 static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status) 191 { 192 if (status != 0) 193 status |= ifcvf_get_status(hw); 194 195 ifcvf_set_status(hw, status); 196 ifcvf_get_status(hw); 197 } 198 199 u64 ifcvf_get_hw_features(struct ifcvf_hw *hw) 200 { 201 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; 202 u32 features_lo, features_hi; 203 u64 features; 204 205 vp_iowrite32(0, &cfg->device_feature_select); 206 features_lo = vp_ioread32(&cfg->device_feature); 207 208 vp_iowrite32(1, &cfg->device_feature_select); 209 features_hi = vp_ioread32(&cfg->device_feature); 210 211 features = ((u64)features_hi << 32) | features_lo; 212 213 return features; 214 } 215 216 u64 ifcvf_get_features(struct ifcvf_hw *hw) 217 { 218 return hw->hw_features; 219 } 220 221 int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features) 222 { 223 struct ifcvf_adapter *ifcvf = vf_to_adapter(hw); 224 225 if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) { 226 IFCVF_ERR(ifcvf->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n"); 227 return -EINVAL; 228 } 229 230 return 0; 231 } 232 233 u32 ifcvf_get_config_size(struct ifcvf_hw *hw) 234 { 235 struct ifcvf_adapter *adapter; 236 u32 net_config_size = sizeof(struct virtio_net_config); 237 u32 blk_config_size = sizeof(struct virtio_blk_config); 238 u32 cap_size = hw->cap_dev_config_size; 239 u32 config_size; 240 241 adapter = vf_to_adapter(hw); 242 /* If the onboard device config space size is greater than 243 * the size of struct virtio_net/blk_config, only the spec 244 * implementing contents size is returned, this is very 245 * unlikely, defensive programming. 246 */ 247 switch (hw->dev_type) { 248 case VIRTIO_ID_NET: 249 config_size = min(cap_size, net_config_size); 250 break; 251 case VIRTIO_ID_BLOCK: 252 config_size = min(cap_size, blk_config_size); 253 break; 254 default: 255 config_size = 0; 256 IFCVF_ERR(adapter->pdev, "VIRTIO ID %u not supported\n", hw->dev_type); 257 } 258 259 return config_size; 260 } 261 262 void ifcvf_read_dev_config(struct ifcvf_hw *hw, u64 offset, 263 void *dst, int length) 264 { 265 u8 old_gen, new_gen, *p; 266 int i; 267 268 WARN_ON(offset + length > hw->config_size); 269 do { 270 old_gen = vp_ioread8(&hw->common_cfg->config_generation); 271 p = dst; 272 for (i = 0; i < length; i++) 273 *p++ = vp_ioread8(hw->dev_cfg + offset + i); 274 275 new_gen = vp_ioread8(&hw->common_cfg->config_generation); 276 } while (old_gen != new_gen); 277 } 278 279 void ifcvf_write_dev_config(struct ifcvf_hw *hw, u64 offset, 280 const void *src, int length) 281 { 282 const u8 *p; 283 int i; 284 285 p = src; 286 WARN_ON(offset + length > hw->config_size); 287 for (i = 0; i < length; i++) 288 vp_iowrite8(*p++, hw->dev_cfg + offset + i); 289 } 290 291 static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features) 292 { 293 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg; 294 295 vp_iowrite32(0, &cfg->guest_feature_select); 296 vp_iowrite32((u32)features, &cfg->guest_feature); 297 298 vp_iowrite32(1, &cfg->guest_feature_select); 299 vp_iowrite32(features >> 32, &cfg->guest_feature); 300 } 301 302 static int ifcvf_config_features(struct ifcvf_hw *hw) 303 { 304 struct ifcvf_adapter *ifcvf; 305 306 ifcvf = vf_to_adapter(hw); 307 ifcvf_set_features(hw, hw->req_features); 308 ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK); 309 310 if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) { 311 IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n"); 312 return -EIO; 313 } 314 315 return 0; 316 } 317 318 u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid) 319 { 320 struct ifcvf_lm_cfg __iomem *ifcvf_lm; 321 void __iomem *avail_idx_addr; 322 u16 last_avail_idx; 323 u32 q_pair_id; 324 325 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg; 326 q_pair_id = qid / 2; 327 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2]; 328 last_avail_idx = vp_ioread16(avail_idx_addr); 329 330 return last_avail_idx; 331 } 332 333 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num) 334 { 335 struct ifcvf_lm_cfg __iomem *ifcvf_lm; 336 void __iomem *avail_idx_addr; 337 u32 q_pair_id; 338 339 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg; 340 q_pair_id = qid / 2; 341 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2]; 342 hw->vring[qid].last_avail_idx = num; 343 vp_iowrite16(num, avail_idx_addr); 344 345 return 0; 346 } 347 348 static int ifcvf_hw_enable(struct ifcvf_hw *hw) 349 { 350 struct virtio_pci_common_cfg __iomem *cfg; 351 u32 i; 352 353 cfg = hw->common_cfg; 354 for (i = 0; i < hw->nr_vring; i++) { 355 if (!hw->vring[i].ready) 356 break; 357 358 vp_iowrite16(i, &cfg->queue_select); 359 vp_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo, 360 &cfg->queue_desc_hi); 361 vp_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo, 362 &cfg->queue_avail_hi); 363 vp_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo, 364 &cfg->queue_used_hi); 365 vp_iowrite16(hw->vring[i].size, &cfg->queue_size); 366 ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx); 367 vp_iowrite16(1, &cfg->queue_enable); 368 } 369 370 return 0; 371 } 372 373 static void ifcvf_hw_disable(struct ifcvf_hw *hw) 374 { 375 u32 i; 376 377 ifcvf_set_config_vector(hw, VIRTIO_MSI_NO_VECTOR); 378 for (i = 0; i < hw->nr_vring; i++) { 379 ifcvf_set_vq_vector(hw, i, VIRTIO_MSI_NO_VECTOR); 380 } 381 } 382 383 int ifcvf_start_hw(struct ifcvf_hw *hw) 384 { 385 ifcvf_reset(hw); 386 ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE); 387 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER); 388 389 if (ifcvf_config_features(hw) < 0) 390 return -EINVAL; 391 392 if (ifcvf_hw_enable(hw) < 0) 393 return -EINVAL; 394 395 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK); 396 397 return 0; 398 } 399 400 void ifcvf_stop_hw(struct ifcvf_hw *hw) 401 { 402 ifcvf_hw_disable(hw); 403 ifcvf_reset(hw); 404 } 405 406 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid) 407 { 408 vp_iowrite16(qid, hw->vring[qid].notify_addr); 409 } 410