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34 #ifndef _VIRTIO_PCI_H_
35 #define _VIRTIO_PCI_H_
40 #include <rte_ethdev.h>
44 /* VirtIO PCI vendor/device ID. */
45 #define VIRTIO_PCI_VENDORID 0x1AF4
46 #define VIRTIO_PCI_DEVICEID_MIN 0x1000
47 #define VIRTIO_PCI_DEVICEID_MAX 0x103F
49 /* VirtIO ABI version, this must match exactly. */
50 #define VIRTIO_PCI_ABI_VERSION 0
53 * VirtIO Header, located in BAR 0.
55 #define VIRTIO_PCI_HOST_FEATURES 0 /* host's supported features (32bit, RO)*/
56 #define VIRTIO_PCI_GUEST_FEATURES 4 /* guest's supported features (32, RW) */
57 #define VIRTIO_PCI_QUEUE_PFN 8 /* physical address of VQ (32, RW) */
58 #define VIRTIO_PCI_QUEUE_NUM 12 /* number of ring entries (16, RO) */
59 #define VIRTIO_PCI_QUEUE_SEL 14 /* current VQ selection (16, RW) */
60 #define VIRTIO_PCI_QUEUE_NOTIFY 16 /* notify host regarding VQ (16, RW) */
61 #define VIRTIO_PCI_STATUS 18 /* device status register (8, RW) */
62 #define VIRTIO_PCI_ISR 19 /* interrupt status register, reading
63 * also clears the register (8, RO) */
64 /* Only if MSIX is enabled: */
65 #define VIRTIO_MSI_CONFIG_VECTOR 20 /* configuration change vector (16, RW) */
66 #define VIRTIO_MSI_QUEUE_VECTOR 22 /* vector for selected VQ notifications
69 /* The bit of the ISR which indicates a device has an interrupt. */
70 #define VIRTIO_PCI_ISR_INTR 0x1
71 /* The bit of the ISR which indicates a device configuration change. */
72 #define VIRTIO_PCI_ISR_CONFIG 0x2
73 /* Vector value used to disable MSI for queue. */
74 #define VIRTIO_MSI_NO_VECTOR 0xFFFF
76 /* VirtIO device IDs. */
77 #define VIRTIO_ID_NETWORK 0x01
78 #define VIRTIO_ID_BLOCK 0x02
79 #define VIRTIO_ID_CONSOLE 0x03
80 #define VIRTIO_ID_ENTROPY 0x04
81 #define VIRTIO_ID_BALLOON 0x05
82 #define VIRTIO_ID_IOMEMORY 0x06
83 #define VIRTIO_ID_9P 0x09
85 /* Status byte for guest to report progress. */
86 #define VIRTIO_CONFIG_STATUS_RESET 0x00
87 #define VIRTIO_CONFIG_STATUS_ACK 0x01
88 #define VIRTIO_CONFIG_STATUS_DRIVER 0x02
89 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
90 #define VIRTIO_CONFIG_STATUS_FEATURES_OK 0x08
91 #define VIRTIO_CONFIG_STATUS_FAILED 0x80
94 * Each virtqueue indirect descriptor list must be physically contiguous.
95 * To allow us to malloc(9) each list individually, limit the number
96 * supported to what will fit in one page. With 4KB pages, this is a limit
97 * of 256 descriptors. If there is ever a need for more, we can switch to
98 * contigmalloc(9) for the larger allocations, similar to what
99 * bus_dmamem_alloc(9) does.
101 * Note the sizeof(struct vring_desc) is 16 bytes.
103 #define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
105 /* The feature bitmap for virtio net */
106 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
107 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
108 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
109 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
110 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
111 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
112 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
113 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
114 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
115 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
116 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
117 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
118 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
119 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
120 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
121 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
122 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
123 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the
125 #define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow
127 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
129 /* Do we get callbacks when the ring is completely used, even if we've
130 * suppressed them? */
131 #define VIRTIO_F_NOTIFY_ON_EMPTY 24
133 /* Can the device handle any descriptor layout? */
134 #define VIRTIO_F_ANY_LAYOUT 27
136 /* We support indirect buffer descriptors */
137 #define VIRTIO_RING_F_INDIRECT_DESC 28
139 #define VIRTIO_F_VERSION_1 32
142 * Some VirtIO feature bits (currently bits 28 through 31) are
143 * reserved for the transport being used (eg. virtio_ring), the
144 * rest are per-device feature bits.
146 #define VIRTIO_TRANSPORT_F_START 28
147 #define VIRTIO_TRANSPORT_F_END 32
149 /* The Guest publishes the used index for which it expects an interrupt
150 * at the end of the avail ring. Host should ignore the avail->flags field. */
151 /* The Host publishes the avail index for which it expects a kick
152 * at the end of the used ring. Guest should ignore the used->flags field. */
153 #define VIRTIO_RING_F_EVENT_IDX 29
155 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
156 #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
159 * Maximum number of virtqueues per device.
161 #define VIRTIO_MAX_VIRTQUEUES 8
163 /* Common configuration */
164 #define VIRTIO_PCI_CAP_COMMON_CFG 1
166 #define VIRTIO_PCI_CAP_NOTIFY_CFG 2
168 #define VIRTIO_PCI_CAP_ISR_CFG 3
169 /* Device specific configuration */
170 #define VIRTIO_PCI_CAP_DEVICE_CFG 4
171 /* PCI configuration access */
172 #define VIRTIO_PCI_CAP_PCI_CFG 5
174 /* This is the PCI capability header: */
175 struct virtio_pci_cap {
176 uint8_t cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
177 uint8_t cap_next; /* Generic PCI field: next ptr. */
178 uint8_t cap_len; /* Generic PCI field: capability length */
179 uint8_t cfg_type; /* Identifies the structure. */
180 uint8_t bar; /* Where to find it. */
181 uint8_t padding[3]; /* Pad to full dword. */
182 uint32_t offset; /* Offset within bar. */
183 uint32_t length; /* Length of the structure, in bytes. */
186 struct virtio_pci_notify_cap {
187 struct virtio_pci_cap cap;
188 uint32_t notify_off_multiplier; /* Multiplier for queue_notify_off. */
191 /* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
192 struct virtio_pci_common_cfg {
193 /* About the whole device. */
194 uint32_t device_feature_select; /* read-write */
195 uint32_t device_feature; /* read-only */
196 uint32_t guest_feature_select; /* read-write */
197 uint32_t guest_feature; /* read-write */
198 uint16_t msix_config; /* read-write */
199 uint16_t num_queues; /* read-only */
200 uint8_t device_status; /* read-write */
201 uint8_t config_generation; /* read-only */
203 /* About a specific virtqueue. */
204 uint16_t queue_select; /* read-write */
205 uint16_t queue_size; /* read-write, power of 2. */
206 uint16_t queue_msix_vector; /* read-write */
207 uint16_t queue_enable; /* read-write */
208 uint16_t queue_notify_off; /* read-only */
209 uint32_t queue_desc_lo; /* read-write */
210 uint32_t queue_desc_hi; /* read-write */
211 uint32_t queue_avail_lo; /* read-write */
212 uint32_t queue_avail_hi; /* read-write */
213 uint32_t queue_used_lo; /* read-write */
214 uint32_t queue_used_hi; /* read-write */
219 struct virtio_pci_ops {
220 void (*read_dev_cfg)(struct virtio_hw *hw, size_t offset,
222 void (*write_dev_cfg)(struct virtio_hw *hw, size_t offset,
223 const void *src, int len);
224 void (*reset)(struct virtio_hw *hw);
226 uint8_t (*get_status)(struct virtio_hw *hw);
227 void (*set_status)(struct virtio_hw *hw, uint8_t status);
229 uint64_t (*get_features)(struct virtio_hw *hw);
230 void (*set_features)(struct virtio_hw *hw, uint64_t features);
232 uint8_t (*get_isr)(struct virtio_hw *hw);
234 uint16_t (*set_config_irq)(struct virtio_hw *hw, uint16_t vec);
236 uint16_t (*get_queue_num)(struct virtio_hw *hw, uint16_t queue_id);
237 void (*setup_queue)(struct virtio_hw *hw, struct virtqueue *vq);
238 void (*del_queue)(struct virtio_hw *hw, struct virtqueue *vq);
239 void (*notify_queue)(struct virtio_hw *hw, struct virtqueue *vq);
242 struct virtio_net_config;
245 struct virtqueue *cvq;
246 struct rte_pci_ioport io;
247 uint64_t guest_features;
248 uint32_t max_tx_queues;
249 uint32_t max_rx_queues;
250 uint16_t vtnet_hdr_size;
255 uint8_t mac_addr[ETHER_ADDR_LEN];
256 uint32_t notify_off_multiplier;
258 uint16_t *notify_base;
259 struct rte_pci_device *dev;
260 struct virtio_pci_common_cfg *common_cfg;
261 struct virtio_net_config *dev_cfg;
262 const struct virtio_pci_ops *vtpci_ops;
266 * This structure is just a reference to read
267 * net device specific config space; it just a chodu structure
270 struct virtio_net_config {
271 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
272 uint8_t mac[ETHER_ADDR_LEN];
273 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
275 uint16_t max_virtqueue_pairs;
276 } __attribute__((packed));
279 * How many bits to shift physical queue address written to QUEUE_PFN.
280 * 12 is historical, and due to x86 page size.
282 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
284 /* The alignment to use between consumer and producer parts of vring. */
285 #define VIRTIO_PCI_VRING_ALIGN 4096
288 vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
290 return (hw->guest_features & (1ULL << bit)) != 0;
294 * Function declaration from virtio_pci.c
296 int vtpci_init(struct rte_pci_device *, struct virtio_hw *);
297 void vtpci_reset(struct virtio_hw *);
299 void vtpci_reinit_complete(struct virtio_hw *);
301 uint8_t vtpci_get_status(struct virtio_hw *);
302 void vtpci_set_status(struct virtio_hw *, uint8_t);
304 uint64_t vtpci_negotiate_features(struct virtio_hw *, uint64_t);
306 void vtpci_write_dev_config(struct virtio_hw *, size_t, const void *, int);
308 void vtpci_read_dev_config(struct virtio_hw *, size_t, void *, int);
310 uint8_t vtpci_isr(struct virtio_hw *);
312 uint16_t vtpci_irq_config(struct virtio_hw *, uint16_t);
314 #endif /* _VIRTIO_PCI_H_ */