drivers/net/virtio/virtio_user/vhost_vdpa.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2020 Red Hat Inc.
   3  */
   4
   5 #include <sys/ioctl.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10
  11 #include <rte_memory.h>
  12
  13 #include "vhost.h"
  14 #include "virtio_user_dev.h"
  15
  16 /* vhost kernel & vdpa ioctls */
  17 #define VHOST_VIRTIO 0xAF
  18 #define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
  19 #define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
  20 #define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
  21 #define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
  22 #define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, void *)
  23 #define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
  24 #define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
  25 #define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
  26 #define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
  27 #define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
  28 #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
  29 #define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
  30 #define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
  31 #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
  32 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
  33 #define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32)
  34 #define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8)
  35 #define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8)
  36 #define VHOST_VDPA_SET_VRING_ENABLE     _IOW(VHOST_VIRTIO, 0x75, \
  37                                              struct vhost_vring_state)
  38
  39 static uint64_t vhost_req_user_to_vdpa[] = {
  40         [VHOST_USER_SET_OWNER] = VHOST_SET_OWNER,
  41         [VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
  42         [VHOST_USER_SET_FEATURES] = VHOST_SET_FEATURES,
  43         [VHOST_USER_GET_FEATURES] = VHOST_GET_FEATURES,
  44         [VHOST_USER_SET_VRING_CALL] = VHOST_SET_VRING_CALL,
  45         [VHOST_USER_SET_VRING_NUM] = VHOST_SET_VRING_NUM,
  46         [VHOST_USER_SET_VRING_BASE] = VHOST_SET_VRING_BASE,
  47         [VHOST_USER_GET_VRING_BASE] = VHOST_GET_VRING_BASE,
  48         [VHOST_USER_SET_VRING_ADDR] = VHOST_SET_VRING_ADDR,
  49         [VHOST_USER_SET_VRING_KICK] = VHOST_SET_VRING_KICK,
  50         [VHOST_USER_SET_MEM_TABLE] = VHOST_SET_MEM_TABLE,
  51         [VHOST_USER_SET_STATUS] = VHOST_VDPA_SET_STATUS,
  52         [VHOST_USER_GET_STATUS] = VHOST_VDPA_GET_STATUS,
  53         [VHOST_USER_SET_VRING_ENABLE] = VHOST_VDPA_SET_VRING_ENABLE,
  54 };
  55
  56 /* no alignment requirement */
  57 struct vhost_iotlb_msg {
  58         uint64_t iova;
  59         uint64_t size;
  60         uint64_t uaddr;
  61 #define VHOST_ACCESS_RO      0x1
  62 #define VHOST_ACCESS_WO      0x2
  63 #define VHOST_ACCESS_RW      0x3
  64         uint8_t perm;
  65 #define VHOST_IOTLB_MISS           1
  66 #define VHOST_IOTLB_UPDATE         2
  67 #define VHOST_IOTLB_INVALIDATE     3
  68 #define VHOST_IOTLB_ACCESS_FAIL    4
  69         uint8_t type;
  70 };
  71
  72 #define VHOST_IOTLB_MSG_V2 0x2
  73
  74 struct vhost_msg {
  75         uint32_t type;
  76         uint32_t reserved;
  77         union {
  78                 struct vhost_iotlb_msg iotlb;
  79                 uint8_t padding[64];
  80         };
  81 };
  82
  83 static int
  84 vhost_vdpa_dma_map(struct virtio_user_dev *dev, void *addr,
  85                                   uint64_t iova, size_t len)
  86 {
  87         struct vhost_msg msg = {};
  88
  89         msg.type = VHOST_IOTLB_MSG_V2;
  90         msg.iotlb.type = VHOST_IOTLB_UPDATE;
  91         msg.iotlb.iova = iova;
  92         msg.iotlb.uaddr = (uint64_t)(uintptr_t)addr;
  93         msg.iotlb.size = len;
  94         msg.iotlb.perm = VHOST_ACCESS_RW;
  95
  96         if (write(dev->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
  97                 PMD_DRV_LOG(ERR, "Failed to send IOTLB update (%s)",
  98                                 strerror(errno));
  99                 return -1;
 100         }
 101
 102         return 0;
 103 }
 104
 105 static int
 106 vhost_vdpa_dma_unmap(struct virtio_user_dev *dev, __rte_unused void *addr,
 107                                   uint64_t iova, size_t len)
 108 {
 109         struct vhost_msg msg = {};
 110
 111         msg.type = VHOST_IOTLB_MSG_V2;
 112         msg.iotlb.type = VHOST_IOTLB_INVALIDATE;
 113         msg.iotlb.iova = iova;
 114         msg.iotlb.size = len;
 115
 116         if (write(dev->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
 117                 PMD_DRV_LOG(ERR, "Failed to send IOTLB invalidate (%s)",
 118                                 strerror(errno));
 119                 return -1;
 120         }
 121
 122         return 0;
 123 }
 124
 125
 126 static int
 127 vhost_vdpa_map_contig(const struct rte_memseg_list *msl,
 128                 const struct rte_memseg *ms, size_t len, void *arg)
 129 {
 130         struct virtio_user_dev *dev = arg;
 131
 132         if (msl->external)
 133                 return 0;
 134
 135         return vhost_vdpa_dma_map(dev, ms->addr, ms->iova, len);
 136 }
 137
 138 static int
 139 vhost_vdpa_map(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
 140                 void *arg)
 141 {
 142         struct virtio_user_dev *dev = arg;
 143
 144         /* skip external memory that isn't a heap */
 145         if (msl->external && !msl->heap)
 146                 return 0;
 147
 148         /* skip any segments with invalid IOVA addresses */
 149         if (ms->iova == RTE_BAD_IOVA)
 150                 return 0;
 151
 152         /* if IOVA mode is VA, we've already mapped the internal segments */
 153         if (!msl->external && rte_eal_iova_mode() == RTE_IOVA_VA)
 154                 return 0;
 155
 156         return vhost_vdpa_dma_map(dev, ms->addr, ms->iova, ms->len);
 157 }
 158
 159 static int
 160 vhost_vdpa_dma_map_all(struct virtio_user_dev *dev)
 161 {
 162         vhost_vdpa_dma_unmap(dev, NULL, 0, SIZE_MAX);
 163
 164         if (rte_eal_iova_mode() == RTE_IOVA_VA) {
 165                 /* with IOVA as VA mode, we can get away with mapping contiguous
 166                  * chunks rather than going page-by-page.
 167                  */
 168                 int ret = rte_memseg_contig_walk_thread_unsafe(
 169                                 vhost_vdpa_map_contig, dev);
 170                 if (ret)
 171                         return ret;
 172                 /* we have to continue the walk because we've skipped the
 173                  * external segments during the config walk.
 174                  */
 175         }
 176         return rte_memseg_walk_thread_unsafe(vhost_vdpa_map, dev);
 177 }
 178
 179 /* with below features, vhost vdpa does not need to do the checksum and TSO,
 180  * these info will be passed to virtio_user through virtio net header.
 181  */
 182 #define VHOST_VDPA_GUEST_OFFLOADS_MASK  \
 183         ((1ULL << VIRTIO_NET_F_GUEST_CSUM) |    \
 184          (1ULL << VIRTIO_NET_F_GUEST_TSO4) |    \
 185          (1ULL << VIRTIO_NET_F_GUEST_TSO6) |    \
 186          (1ULL << VIRTIO_NET_F_GUEST_ECN)  |    \
 187          (1ULL << VIRTIO_NET_F_GUEST_UFO))
 188
 189 #define VHOST_VDPA_HOST_OFFLOADS_MASK           \
 190         ((1ULL << VIRTIO_NET_F_HOST_TSO4) |     \
 191          (1ULL << VIRTIO_NET_F_HOST_TSO6) |     \
 192          (1ULL << VIRTIO_NET_F_CSUM))
 193
 194 static int
 195 vhost_vdpa_ioctl(struct virtio_user_dev *dev,
 196                    enum vhost_user_request req,
 197                    void *arg)
 198 {
 199         int ret = -1;
 200         uint64_t req_vdpa;
 201
 202         PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
 203
 204         req_vdpa = vhost_req_user_to_vdpa[req];
 205
 206         if (req_vdpa == VHOST_SET_MEM_TABLE)
 207                 return vhost_vdpa_dma_map_all(dev);
 208
 209         if (req_vdpa == VHOST_SET_FEATURES) {
 210                 /* WORKAROUND */
 211                 *(uint64_t *)arg |= 1ULL << VIRTIO_F_IOMMU_PLATFORM;
 212
 213                 /* Multiqueue not supported for now */
 214                 *(uint64_t *)arg &= ~(1ULL << VIRTIO_NET_F_MQ);
 215         }
 216
 217         switch (req_vdpa) {
 218         case VHOST_SET_VRING_NUM:
 219         case VHOST_SET_VRING_ADDR:
 220         case VHOST_SET_VRING_BASE:
 221         case VHOST_GET_VRING_BASE:
 222         case VHOST_SET_VRING_KICK:
 223         case VHOST_SET_VRING_CALL:
 224                 PMD_DRV_LOG(DEBUG, "vhostfd=%d, index=%u",
 225                             dev->vhostfd, *(unsigned int *)arg);
 226                 break;
 227         default:
 228                 break;
 229         }
 230
 231         ret = ioctl(dev->vhostfd, req_vdpa, arg);
 232         if (ret < 0)
 233                 PMD_DRV_LOG(ERR, "%s failed: %s",
 234                             vhost_msg_strings[req], strerror(errno));
 235
 236         return ret;
 237 }
 238
 239 /**
 240  * Set up environment to talk with a vhost vdpa backend.
 241  *
 242  * @return
 243  *   - (-1) if fail to set up;
 244  *   - (>=0) if successful.
 245  */
 246 static int
 247 vhost_vdpa_setup(struct virtio_user_dev *dev)
 248 {
 249         uint32_t did = (uint32_t)-1;
 250
 251         dev->vhostfd = open(dev->path, O_RDWR);
 252         if (dev->vhostfd < 0) {
 253                 PMD_DRV_LOG(ERR, "Failed to open %s: %s\n",
 254                                 dev->path, strerror(errno));
 255                 return -1;
 256         }
 257
 258         if (ioctl(dev->vhostfd, VHOST_VDPA_GET_DEVICE_ID, &did) < 0 ||
 259                         did != VIRTIO_ID_NETWORK) {
 260                 PMD_DRV_LOG(ERR, "Invalid vdpa device ID: %u\n", did);
 261                 return -1;
 262         }
 263
 264         return 0;
 265 }
 266
 267 static int
 268 vhost_vdpa_enable_queue_pair(struct virtio_user_dev *dev,
 269                                uint16_t pair_idx,
 270                                int enable)
 271 {
 272         int i;
 273
 274         if (dev->qp_enabled[pair_idx] == enable)
 275                 return 0;
 276
 277         for (i = 0; i < 2; ++i) {
 278                 struct vhost_vring_state state = {
 279                         .index = pair_idx * 2 + i,
 280                         .num   = enable,
 281                 };
 282
 283                 if (vhost_vdpa_ioctl(dev, VHOST_USER_SET_VRING_ENABLE, &state))
 284                         return -1;
 285         }
 286
 287         dev->qp_enabled[pair_idx] = enable;
 288
 289         return 0;
 290 }
 291
 292 struct virtio_user_backend_ops virtio_ops_vdpa = {
 293         .setup = vhost_vdpa_setup,
 294         .send_request = vhost_vdpa_ioctl,
 295         .enable_qp = vhost_vdpa_enable_queue_pair,
 296         .dma_map = vhost_vdpa_dma_map,
 297         .dma_unmap = vhost_vdpa_dma_unmap,
 298 };