ceph/src/spdk/dpdk/drivers/net/virtio/virtio_pci.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _VIRTIO_PCI_H_
   6 #define _VIRTIO_PCI_H_
   7
   8 #include <stdint.h>
   9 #include <stdbool.h>
  10
  11 #include <rte_pci.h>
  12 #include <rte_bus_pci.h>
  13 #include <rte_ethdev_driver.h>
  14
  15 struct virtqueue;
  16 struct virtnet_ctl;
  17
  18 /* VirtIO PCI vendor/device ID. */
  19 #define VIRTIO_PCI_VENDORID     0x1AF4
  20 #define VIRTIO_PCI_LEGACY_DEVICEID_NET 0x1000
  21 #define VIRTIO_PCI_MODERN_DEVICEID_NET 0x1041
  22
  23 /* VirtIO ABI version, this must match exactly. */
  24 #define VIRTIO_PCI_ABI_VERSION 0
  25
  26 /*
  27  * VirtIO Header, located in BAR 0.
  28  */
  29 #define VIRTIO_PCI_HOST_FEATURES  0  /* host's supported features (32bit, RO)*/
  30 #define VIRTIO_PCI_GUEST_FEATURES 4  /* guest's supported features (32, RW) */
  31 #define VIRTIO_PCI_QUEUE_PFN      8  /* physical address of VQ (32, RW) */
  32 #define VIRTIO_PCI_QUEUE_NUM      12 /* number of ring entries (16, RO) */
  33 #define VIRTIO_PCI_QUEUE_SEL      14 /* current VQ selection (16, RW) */
  34 #define VIRTIO_PCI_QUEUE_NOTIFY   16 /* notify host regarding VQ (16, RW) */
  35 #define VIRTIO_PCI_STATUS         18 /* device status register (8, RW) */
  36 #define VIRTIO_PCI_ISR            19 /* interrupt status register, reading
  37                                       * also clears the register (8, RO) */
  38 /* Only if MSIX is enabled: */
  39 #define VIRTIO_MSI_CONFIG_VECTOR  20 /* configuration change vector (16, RW) */
  40 #define VIRTIO_MSI_QUEUE_VECTOR   22 /* vector for selected VQ notifications
  41                                       (16, RW) */
  42
  43 /* The bit of the ISR which indicates a device has an interrupt. */
  44 #define VIRTIO_PCI_ISR_INTR   0x1
  45 /* The bit of the ISR which indicates a device configuration change. */
  46 #define VIRTIO_PCI_ISR_CONFIG 0x2
  47 /* Vector value used to disable MSI for queue. */
  48 #define VIRTIO_MSI_NO_VECTOR 0xFFFF
  49
  50 /* VirtIO device IDs. */
  51 #define VIRTIO_ID_NETWORK  0x01
  52 #define VIRTIO_ID_BLOCK    0x02
  53 #define VIRTIO_ID_CONSOLE  0x03
  54 #define VIRTIO_ID_ENTROPY  0x04
  55 #define VIRTIO_ID_BALLOON  0x05
  56 #define VIRTIO_ID_IOMEMORY 0x06
  57 #define VIRTIO_ID_9P       0x09
  58
  59 /* Status byte for guest to report progress. */
  60 #define VIRTIO_CONFIG_STATUS_RESET     0x00
  61 #define VIRTIO_CONFIG_STATUS_ACK       0x01
  62 #define VIRTIO_CONFIG_STATUS_DRIVER    0x02
  63 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
  64 #define VIRTIO_CONFIG_STATUS_FEATURES_OK 0x08
  65 #define VIRTIO_CONFIG_STATUS_FAILED    0x80
  66
  67 /*
  68  * Each virtqueue indirect descriptor list must be physically contiguous.
  69  * To allow us to malloc(9) each list individually, limit the number
  70  * supported to what will fit in one page. With 4KB pages, this is a limit
  71  * of 256 descriptors. If there is ever a need for more, we can switch to
  72  * contigmalloc(9) for the larger allocations, similar to what
  73  * bus_dmamem_alloc(9) does.
  74  *
  75  * Note the sizeof(struct vring_desc) is 16 bytes.
  76  */
  77 #define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
  78
  79 /* The feature bitmap for virtio net */
  80 #define VIRTIO_NET_F_CSUM       0       /* Host handles pkts w/ partial csum */
  81 #define VIRTIO_NET_F_GUEST_CSUM 1       /* Guest handles pkts w/ partial csum */
  82 #define VIRTIO_NET_F_MTU        3       /* Initial MTU advice. */
  83 #define VIRTIO_NET_F_MAC        5       /* Host has given MAC address. */
  84 #define VIRTIO_NET_F_GUEST_TSO4 7       /* Guest can handle TSOv4 in. */
  85 #define VIRTIO_NET_F_GUEST_TSO6 8       /* Guest can handle TSOv6 in. */
  86 #define VIRTIO_NET_F_GUEST_ECN  9       /* Guest can handle TSO[6] w/ ECN in. */
  87 #define VIRTIO_NET_F_GUEST_UFO  10      /* Guest can handle UFO in. */
  88 #define VIRTIO_NET_F_HOST_TSO4  11      /* Host can handle TSOv4 in. */
  89 #define VIRTIO_NET_F_HOST_TSO6  12      /* Host can handle TSOv6 in. */
  90 #define VIRTIO_NET_F_HOST_ECN   13      /* Host can handle TSO[6] w/ ECN in. */
  91 #define VIRTIO_NET_F_HOST_UFO   14      /* Host can handle UFO in. */
  92 #define VIRTIO_NET_F_MRG_RXBUF  15      /* Host can merge receive buffers. */
  93 #define VIRTIO_NET_F_STATUS     16      /* virtio_net_config.status available */
  94 #define VIRTIO_NET_F_CTRL_VQ    17      /* Control channel available */
  95 #define VIRTIO_NET_F_CTRL_RX    18      /* Control channel RX mode support */
  96 #define VIRTIO_NET_F_CTRL_VLAN  19      /* Control channel VLAN filtering */
  97 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20   /* Extra RX mode control support */
  98 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21  /* Guest can announce device on the
  99                                          * network */
 100 #define VIRTIO_NET_F_MQ         22      /* Device supports Receive Flow
 101                                          * Steering */
 102 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23   /* Set MAC address */
 103
 104 /* Do we get callbacks when the ring is completely used, even if we've
 105  * suppressed them? */
 106 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
 107
 108 /* Can the device handle any descriptor layout? */
 109 #define VIRTIO_F_ANY_LAYOUT             27
 110
 111 /* We support indirect buffer descriptors */
 112 #define VIRTIO_RING_F_INDIRECT_DESC     28
 113
 114 #define VIRTIO_F_VERSION_1              32
 115 #define VIRTIO_F_IOMMU_PLATFORM 33
 116
 117 /*
 118  * Some VirtIO feature bits (currently bits 28 through 31) are
 119  * reserved for the transport being used (eg. virtio_ring), the
 120  * rest are per-device feature bits.
 121  */
 122 #define VIRTIO_TRANSPORT_F_START 28
 123 #define VIRTIO_TRANSPORT_F_END   34
 124
 125 /*
 126  * Inorder feature indicates that all buffers are used by the device
 127  * in the same order in which they have been made available.
 128  */
 129 #define VIRTIO_F_IN_ORDER 35
 130
 131 /* The Guest publishes the used index for which it expects an interrupt
 132  * at the end of the avail ring. Host should ignore the avail->flags field. */
 133 /* The Host publishes the avail index for which it expects a kick
 134  * at the end of the used ring. Guest should ignore the used->flags field. */
 135 #define VIRTIO_RING_F_EVENT_IDX         29
 136
 137 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
 138 #define VIRTIO_NET_S_ANNOUNCE   2       /* Announcement is needed */
 139
 140 /*
 141  * Maximum number of virtqueues per device.
 142  */
 143 #define VIRTIO_MAX_VIRTQUEUE_PAIRS 8
 144 #define VIRTIO_MAX_VIRTQUEUES (VIRTIO_MAX_VIRTQUEUE_PAIRS * 2 + 1)
 145
 146 /* Common configuration */
 147 #define VIRTIO_PCI_CAP_COMMON_CFG       1
 148 /* Notifications */
 149 #define VIRTIO_PCI_CAP_NOTIFY_CFG       2
 150 /* ISR Status */
 151 #define VIRTIO_PCI_CAP_ISR_CFG          3
 152 /* Device specific configuration */
 153 #define VIRTIO_PCI_CAP_DEVICE_CFG       4
 154 /* PCI configuration access */
 155 #define VIRTIO_PCI_CAP_PCI_CFG          5
 156
 157 /* This is the PCI capability header: */
 158 struct virtio_pci_cap {
 159         uint8_t cap_vndr;               /* Generic PCI field: PCI_CAP_ID_VNDR */
 160         uint8_t cap_next;               /* Generic PCI field: next ptr. */
 161         uint8_t cap_len;                /* Generic PCI field: capability length */
 162         uint8_t cfg_type;               /* Identifies the structure. */
 163         uint8_t bar;                    /* Where to find it. */
 164         uint8_t padding[3];             /* Pad to full dword. */
 165         uint32_t offset;                /* Offset within bar. */
 166         uint32_t length;                /* Length of the structure, in bytes. */
 167 };
 168
 169 struct virtio_pci_notify_cap {
 170         struct virtio_pci_cap cap;
 171         uint32_t notify_off_multiplier; /* Multiplier for queue_notify_off. */
 172 };
 173
 174 /* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
 175 struct virtio_pci_common_cfg {
 176         /* About the whole device. */
 177         uint32_t device_feature_select; /* read-write */
 178         uint32_t device_feature;        /* read-only */
 179         uint32_t guest_feature_select;  /* read-write */
 180         uint32_t guest_feature;         /* read-write */
 181         uint16_t msix_config;           /* read-write */
 182         uint16_t num_queues;            /* read-only */
 183         uint8_t device_status;          /* read-write */
 184         uint8_t config_generation;      /* read-only */
 185
 186         /* About a specific virtqueue. */
 187         uint16_t queue_select;          /* read-write */
 188         uint16_t queue_size;            /* read-write, power of 2. */
 189         uint16_t queue_msix_vector;     /* read-write */
 190         uint16_t queue_enable;          /* read-write */
 191         uint16_t queue_notify_off;      /* read-only */
 192         uint32_t queue_desc_lo;         /* read-write */
 193         uint32_t queue_desc_hi;         /* read-write */
 194         uint32_t queue_avail_lo;        /* read-write */
 195         uint32_t queue_avail_hi;        /* read-write */
 196         uint32_t queue_used_lo;         /* read-write */
 197         uint32_t queue_used_hi;         /* read-write */
 198 };
 199
 200 struct virtio_hw;
 201
 202 struct virtio_pci_ops {
 203         void (*read_dev_cfg)(struct virtio_hw *hw, size_t offset,
 204                              void *dst, int len);
 205         void (*write_dev_cfg)(struct virtio_hw *hw, size_t offset,
 206                               const void *src, int len);
 207         void (*reset)(struct virtio_hw *hw);
 208
 209         uint8_t (*get_status)(struct virtio_hw *hw);
 210         void    (*set_status)(struct virtio_hw *hw, uint8_t status);
 211
 212         uint64_t (*get_features)(struct virtio_hw *hw);
 213         void     (*set_features)(struct virtio_hw *hw, uint64_t features);
 214
 215         uint8_t (*get_isr)(struct virtio_hw *hw);
 216
 217         uint16_t (*set_config_irq)(struct virtio_hw *hw, uint16_t vec);
 218
 219         uint16_t (*set_queue_irq)(struct virtio_hw *hw, struct virtqueue *vq,
 220                         uint16_t vec);
 221
 222         uint16_t (*get_queue_num)(struct virtio_hw *hw, uint16_t queue_id);
 223         int (*setup_queue)(struct virtio_hw *hw, struct virtqueue *vq);
 224         void (*del_queue)(struct virtio_hw *hw, struct virtqueue *vq);
 225         void (*notify_queue)(struct virtio_hw *hw, struct virtqueue *vq);
 226 };
 227
 228 struct virtio_net_config;
 229
 230 struct virtio_hw {
 231         struct virtnet_ctl *cvq;
 232         uint64_t    req_guest_features;
 233         uint64_t    guest_features;
 234         uint32_t    max_queue_pairs;
 235         uint16_t    started;
 236         uint16_t        max_mtu;
 237         uint16_t    vtnet_hdr_size;
 238         uint8_t     vlan_strip;
 239         uint8_t     use_msix;
 240         uint8_t     modern;
 241         uint8_t     use_simple_rx;
 242         uint8_t     use_inorder_rx;
 243         uint8_t     use_inorder_tx;
 244         bool        has_tx_offload;
 245         bool        has_rx_offload;
 246         uint16_t    port_id;
 247         uint8_t     mac_addr[ETHER_ADDR_LEN];
 248         uint32_t    notify_off_multiplier;
 249         uint8_t     *isr;
 250         uint16_t    *notify_base;
 251         struct virtio_pci_common_cfg *common_cfg;
 252         struct virtio_net_config *dev_cfg;
 253         void        *virtio_user_dev;
 254         /*
 255          * App management thread and virtio interrupt handler thread
 256          * both can change device state, this lock is meant to avoid
 257          * such a contention.
 258          */
 259         rte_spinlock_t state_lock;
 260         struct rte_mbuf **inject_pkts;
 261
 262         struct virtqueue **vqs;
 263 };
 264
 265
 266 /*
 267  * While virtio_hw is stored in shared memory, this structure stores
 268  * some infos that may vary in the multiple process model locally.
 269  * For example, the vtpci_ops pointer.
 270  */
 271 struct virtio_hw_internal {
 272         const struct virtio_pci_ops *vtpci_ops;
 273         struct rte_pci_ioport io;
 274 };
 275
 276 #define VTPCI_OPS(hw)   (virtio_hw_internal[(hw)->port_id].vtpci_ops)
 277 #define VTPCI_IO(hw)    (&virtio_hw_internal[(hw)->port_id].io)
 278
 279 extern struct virtio_hw_internal virtio_hw_internal[RTE_MAX_ETHPORTS];
 280
 281
 282 /*
 283  * This structure is just a reference to read
 284  * net device specific config space; it just a chodu structure
 285  *
 286  */
 287 struct virtio_net_config {
 288         /* The config defining mac address (if VIRTIO_NET_F_MAC) */
 289         uint8_t    mac[ETHER_ADDR_LEN];
 290         /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
 291         uint16_t   status;
 292         uint16_t   max_virtqueue_pairs;
 293         uint16_t   mtu;
 294 } __attribute__((packed));
 295
 296 /*
 297  * How many bits to shift physical queue address written to QUEUE_PFN.
 298  * 12 is historical, and due to x86 page size.
 299  */
 300 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
 301
 302 /* The alignment to use between consumer and producer parts of vring. */
 303 #define VIRTIO_PCI_VRING_ALIGN 4096
 304
 305 enum virtio_msix_status {
 306         VIRTIO_MSIX_NONE = 0,
 307         VIRTIO_MSIX_DISABLED = 1,
 308         VIRTIO_MSIX_ENABLED = 2
 309 };
 310
 311 static inline int
 312 vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
 313 {
 314         return (hw->guest_features & (1ULL << bit)) != 0;
 315 }
 316
 317 /*
 318  * Function declaration from virtio_pci.c
 319  */
 320 int vtpci_init(struct rte_pci_device *dev, struct virtio_hw *hw);
 321 void vtpci_reset(struct virtio_hw *);
 322
 323 void vtpci_reinit_complete(struct virtio_hw *);
 324
 325 uint8_t vtpci_get_status(struct virtio_hw *);
 326 void vtpci_set_status(struct virtio_hw *, uint8_t);
 327
 328 uint64_t vtpci_negotiate_features(struct virtio_hw *, uint64_t);
 329
 330 void vtpci_write_dev_config(struct virtio_hw *, size_t, const void *, int);
 331
 332 void vtpci_read_dev_config(struct virtio_hw *, size_t, void *, int);
 333
 334 uint8_t vtpci_isr(struct virtio_hw *);
 335
 336 enum virtio_msix_status vtpci_msix_detect(struct rte_pci_device *dev);
 337
 338 extern const struct virtio_pci_ops legacy_ops;
 339 extern const struct virtio_pci_ops modern_ops;
 340 extern const struct virtio_pci_ops virtio_user_ops;
 341
 342 #endif /* _VIRTIO_PCI_H_ */