aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/devices/virtio/pci.h
blob: 4c62885adbf8b78e5e5721e05af90a128912eba4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/*
 * Copyright (c) 2018 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __included_virtio_pci_h__
#define __included_virtio_pci_h__

/* VirtIO ABI version, this must match exactly. */
#define VIRTIO_PCI_ABI_VERSION 0

/*
 * VirtIO Header, located in BAR 0.
 */
#define VIRTIO_PCI_HOST_FEATURES  0	/* host's supported features (32bit, RO) */
#define VIRTIO_PCI_GUEST_FEATURES 4	/* guest's supported features (32, RW) */
#define VIRTIO_PCI_QUEUE_PFN      8	/* physical address of VQ (32, RW) */
#define VIRTIO_PCI_QUEUE_NUM      12	/* number of ring entries (16, RO) */
#define VIRTIO_PCI_QUEUE_SEL      14	/* current VQ selection (16, RW) */
#define VIRTIO_PCI_QUEUE_NOTIFY   16	/* notify host regarding VQ (16, RW) */
#define VIRTIO_PCI_STATUS         18	/* device status register (8, RW) */
#define VIRTIO_PCI_ISR            19	/* interrupt status register, reading
					 * also clears the register (8, RO) */
/* Only if MSIX is enabled: */
#define VIRTIO_MSI_CONFIG_VECTOR  20	/* configuration change vector (16, RW) */
#define VIRTIO_MSI_QUEUE_VECTOR   22	/* vector for selected VQ notifications
					   (16, RW) */

/*
 * Vector value used to disable MSI for queue.
 * define in include/linux/virtio_pci.h
 * #define VIRTIO_MSI_NO_VECTOR 0xFFFF
 */

/* The bit of the ISR which indicates a device has an interrupt. */
#define VIRTIO_PCI_ISR_INTR   0x1
/* The bit of the ISR which indicates a device configuration change. */
#define VIRTIO_PCI_ISR_CONFIG 0x2

/* VirtIO device IDs. */
#define VIRTIO_ID_NETWORK  0x01

/* Status byte for guest to report progress. */
#define foreach_virtio_config_status_flags	\
  _ (VIRTIO_CONFIG_STATUS_RESET, 0x00)		\
  _ (VIRTIO_CONFIG_STATUS_ACK, 0x01)		\
  _ (VIRTIO_CONFIG_STATUS_DRIVER, 0x02)		\
  _ (VIRTIO_CONFIG_STATUS_DRIVER_OK, 0x04)	\
  _ (VIRTIO_CONFIG_STATUS_FEATURES_OK, 0x08)	\
  _ (VIRTIO_CONFIG_STATUS_DEVICE_NEEDS_RESET, 0x40) \
  _ (VIRTIO_CONFIG_STATUS_FAILED, 0x80)

typedef enum
{
#define _(a, b) a = b,
  foreach_virtio_config_status_flags
#undef _
} virtio_config_status_flags_t;

#define foreach_virtio_net_feature_flags      \
  _ (VIRTIO_NET_F_CSUM, 0)      /* Host handles pkts w/ partial csum */ \
  _ (VIRTIO_NET_F_GUEST_CSUM, 1) /* Guest handles pkts w/ partial csum */ \
  _ (VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, 2) /* Dynamic offload configuration. */ \
  _ (VIRTIO_NET_F_MTU, 3)       /* Initial MTU advice. */ \
  _ (VIRTIO_NET_F_MAC, 5)       /* Host has given MAC address. */ \
  _ (VIRTIO_NET_F_GSO, 6)       /* Host handles pkts w/ any GSO. */ \
  _ (VIRTIO_NET_F_GUEST_TSO4, 7)        /* Guest can handle TSOv4 in. */ \
  _ (VIRTIO_NET_F_GUEST_TSO6, 8)        /* Guest can handle TSOv6 in. */ \
  _ (VIRTIO_NET_F_GUEST_ECN, 9) /* Guest can handle TSO[6] w/ ECN in. */ \
  _ (VIRTIO_NET_F_GUEST_UFO, 10)        /* Guest can handle UFO in. */ \
  _ (VIRTIO_NET_F_HOST_TSO4, 11)        /* Host can handle TSOv4 in. */ \
  _ (VIRTIO_NET_F_HOST_TSO6, 12)        /* Host can handle TSOv6 in. */ \
  _ (VIRTIO_NET_F_HOST_ECN, 13) /* Host can handle TSO[6] w/ ECN in. */ \
  _ (VIRTIO_NET_F_HOST_UFO, 14) /* Host can handle UFO in. */ \
  _ (VIRTIO_NET_F_MRG_RXBUF, 15)        /* Host can merge receive buffers. */ \
  _ (VIRTIO_NET_F_STATUS, 16)   /* virtio_net_config.status available */ \
  _ (VIRTIO_NET_F_CTRL_VQ, 17)  /* Control channel available */ \
  _ (VIRTIO_NET_F_CTRL_RX, 18)  /* Control channel RX mode support */ \
  _ (VIRTIO_NET_F_CTRL_VLAN, 19)        /* Control channel VLAN filtering */ \
  _ (VIRTIO_NET_F_CTRL_RX_EXTRA, 20)    /* Extra RX mode control support */ \
  _ (VIRTIO_NET_F_GUEST_ANNOUNCE, 21)   /* Guest can announce device on the network */ \
  _ (VIRTIO_NET_F_MQ, 22)               /* Device supports Receive Flow Steering */ \
  _ (VIRTIO_NET_F_CTRL_MAC_ADDR, 23)    /* Set MAC address */ \
  _ (VIRTIO_F_NOTIFY_ON_EMPTY, 24) \
  _ (VHOST_F_LOG_ALL, 26)      /* Log all write descriptors */ \
  _ (VIRTIO_F_ANY_LAYOUT, 27)  /* Can the device handle any descripor layout */ \
  _ (VIRTIO_RING_F_INDIRECT_DESC, 28)   /* Support indirect buffer descriptors */ \
  _ (VIRTIO_RING_F_EVENT_IDX, 29)       /* The Guest publishes the used index for which it expects an interrupt \
 * at the end of the avail ring. Host should ignore the avail->flags field. */ \
/* The Host publishes the avail index for which it expects a kick \
 * at the end of the used ring. Guest should ignore the used->flags field. */ \
  _ (VHOST_USER_F_PROTOCOL_FEATURES, 30)

#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
#define VIRTIO_NET_F_MTU 3
#define VIRTIO_NET_S_LINK_UP    1	/* Link is up */
#define VIRTIO_NET_S_ANNOUNCE   2	/* Announcement is needed */

/*
 * Control network offloads
 * Reconfigures the network offloads that Guest can handle.
 * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
 * Command data format matches the feature bit mask exactly.
 * See VIRTIO_NET_F_GUEST_* for the list of offloads
 * that can be enabled/disabled.
 */
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0

/* Common configuration */
#define VIRTIO_PCI_CAP_COMMON_CFG       1
/* Notifications */
#define VIRTIO_PCI_CAP_NOTIFY_CFG       2
/* ISR Status */
#define VIRTIO_PCI_CAP_ISR_CFG          3
/* Device specific configuration */
#define VIRTIO_PCI_CAP_DEVICE_CFG       4
/* PCI configuration access */
#define VIRTIO_PCI_CAP_PCI_CFG          5

#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12

#define VIRTIO_PCI_VRING_ALIGN 4096

typedef enum
{
  VIRTIO_MSIX_NONE = 0,
  VIRTIO_MSIX_DISABLED = 1,
  VIRTIO_MSIX_ENABLED = 2
} virtio_msix_status_t;

/* This is the PCI capability header: */
typedef struct
{
  u8 cap_vndr;			/* Generic PCI field: PCI_CAP_ID_VNDR */
  u8 cap_next;			/* Generic PCI field: next ptr. */
  u8 cap_len;			/* Generic PCI field: capability length */
  u8 cfg_type;			/* Identifies the structure. */
  u8 bar;			/* Where to find it. */
  u8 padding[3];		/* Pad to full dword. */
  u32 offset;			/* Offset within bar. */
  u32 length;			/* Length of the structure, in bytes. */
} virtio_pci_cap_t;

typedef struct
{
  struct virtio_pci_cap cap;
  u32 notify_off_multiplier;	/* Multiplier for queue_notify_off. */
} virtio_pci_notify_cap_t;

/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
typedef struct
{
  /* About the whole device. */
  u32 device_feature_select;	/* read-write */
  u32 device_feature;		/* read-only */
  u32 guest_feature_select;	/* read-write */
  u32 guest_feature;		/* read-write */
  u16 msix_config;		/* read-write */
  u16 num_queues;		/* read-only */
  u8 device_status;		/* read-write */
  u8 config_generation;		/* read-only */

  /* About a specific virtqueue. */
  u16 queue_select;		/* read-write */
  u16 queue_size;		/* read-write, power of 2. */
  u16 queue_msix_vector;	/* read-write */
  u16 queue_enable;		/* read-write */
  u16 queue_notify_off;		/* read-only */
  u32 queue_desc_lo;		/* read-write */
  u32 queue_desc_hi;		/* read-write */
  u32 queue_avail_lo;		/* read-write */
  u32 queue_avail_hi;		/* read-write */
  u32 queue_used_lo;		/* read-write */
  u32 queue_used_hi;		/* read-write */
} virtio_pci_common_cfg_t;

typedef struct
{
  u64 addr;
  u32 len;
  u16 flags;
  u16 next;
} vring_desc_t;

typedef struct
{
  u16 flags;
  u16 idx;
  u16 ring[0];
  /*  u16 used_event; */
} vring_avail_t;

typedef struct
{
  u32 id;
  u32 len;
} vring_used_elem_t;

typedef struct
{
  u16 flags;
  u16 idx;
  vring_used_elem_t ring[0];
  /* u16 avail_event; */
} vring_used_t;

typedef struct
{
  u32 addr;
  /* return */
  i32 rv;
  u32 sw_if_index;
  u8 mac_addr_set;
  u8 mac_addr[6];
  u64 features;
  u8 gso_enabled;
  clib_error_t *error;
} virtio_pci_create_if_args_t;

extern void debug_device_config_space (vlib_main_t * vm, virtio_if_t * vif);
extern void device_status (vlib_main_t * vm, virtio_if_t * vif);
void virtio_pci_create_if (vlib_main_t * vm,
			   virtio_pci_create_if_args_t * args);
int virtio_pci_delete_if (vlib_main_t * vm, virtio_if_t * ad);

#endif /* __included_virtio_pci_h__ */
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */