2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef __included_virtio_pci_h__
17 #define __included_virtio_pci_h__
19 /* VirtIO ABI version, this must match exactly. */
20 #define VIRTIO_PCI_ABI_VERSION 0
23 * VirtIO Header, located in BAR 0.
25 #define VIRTIO_PCI_HOST_FEATURES 0 /* host's supported features (32bit, RO) */
26 #define VIRTIO_PCI_GUEST_FEATURES 4 /* guest's supported features (32, RW) */
27 #define VIRTIO_PCI_QUEUE_PFN 8 /* physical address of VQ (32, RW) */
28 #define VIRTIO_PCI_QUEUE_NUM 12 /* number of ring entries (16, RO) */
29 #define VIRTIO_PCI_QUEUE_SEL 14 /* current VQ selection (16, RW) */
30 #define VIRTIO_PCI_QUEUE_NOTIFY 16 /* notify host regarding VQ (16, RW) */
31 #define VIRTIO_PCI_STATUS 18 /* device status register (8, RW) */
32 #define VIRTIO_PCI_ISR 19 /* interrupt status register, reading
33 * also clears the register (8, RO) */
34 /* Only if MSIX is enabled: */
35 #define VIRTIO_MSI_CONFIG_VECTOR 20 /* configuration change vector (16, RW) */
36 #define VIRTIO_MSI_QUEUE_VECTOR 22 /* vector for selected VQ notifications
40 * Vector value used to disable MSI for queue.
41 * define in include/linux/virtio_pci.h
42 * #define VIRTIO_MSI_NO_VECTOR 0xFFFF
45 /* The bit of the ISR which indicates a device has an interrupt. */
46 #define VIRTIO_PCI_ISR_INTR 0x1
47 /* The bit of the ISR which indicates a device configuration change. */
48 #define VIRTIO_PCI_ISR_CONFIG 0x2
50 /* VirtIO device IDs. */
51 #define VIRTIO_ID_NETWORK 0x01
53 /* Status byte for guest to report progress. */
54 #define foreach_virtio_config_status_flags \
55 _ (VIRTIO_CONFIG_STATUS_RESET, 0x00) \
56 _ (VIRTIO_CONFIG_STATUS_ACK, 0x01) \
57 _ (VIRTIO_CONFIG_STATUS_DRIVER, 0x02) \
58 _ (VIRTIO_CONFIG_STATUS_DRIVER_OK, 0x04) \
59 _ (VIRTIO_CONFIG_STATUS_FEATURES_OK, 0x08) \
60 _ (VIRTIO_CONFIG_STATUS_DEVICE_NEEDS_RESET, 0x40) \
61 _ (VIRTIO_CONFIG_STATUS_FAILED, 0x80)
65 #define _(a, b) a = b,
66 foreach_virtio_config_status_flags
68 } virtio_config_status_flags_t;
70 #define foreach_virtio_net_feature_flags \
71 _ (VIRTIO_NET_F_CSUM, 0) /* Host handles pkts w/ partial csum */ \
72 _ (VIRTIO_NET_F_GUEST_CSUM, 1) /* Guest handles pkts w/ partial csum */ \
73 _ (VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, 2) /* Dynamic offload configuration. */ \
74 _ (VIRTIO_NET_F_MTU, 3) /* Initial MTU advice. */ \
75 _ (VIRTIO_NET_F_MAC, 5) /* Host has given MAC address. */ \
76 _ (VIRTIO_NET_F_GSO, 6) /* Host handles pkts w/ any GSO. */ \
77 _ (VIRTIO_NET_F_GUEST_TSO4, 7) /* Guest can handle TSOv4 in. */ \
78 _ (VIRTIO_NET_F_GUEST_TSO6, 8) /* Guest can handle TSOv6 in. */ \
79 _ (VIRTIO_NET_F_GUEST_ECN, 9) /* Guest can handle TSO[6] w/ ECN in. */ \
80 _ (VIRTIO_NET_F_GUEST_UFO, 10) /* Guest can handle UFO in. */ \
81 _ (VIRTIO_NET_F_HOST_TSO4, 11) /* Host can handle TSOv4 in. */ \
82 _ (VIRTIO_NET_F_HOST_TSO6, 12) /* Host can handle TSOv6 in. */ \
83 _ (VIRTIO_NET_F_HOST_ECN, 13) /* Host can handle TSO[6] w/ ECN in. */ \
84 _ (VIRTIO_NET_F_HOST_UFO, 14) /* Host can handle UFO in. */ \
85 _ (VIRTIO_NET_F_MRG_RXBUF, 15) /* Host can merge receive buffers. */ \
86 _ (VIRTIO_NET_F_STATUS, 16) /* virtio_net_config.status available */ \
87 _ (VIRTIO_NET_F_CTRL_VQ, 17) /* Control channel available */ \
88 _ (VIRTIO_NET_F_CTRL_RX, 18) /* Control channel RX mode support */ \
89 _ (VIRTIO_NET_F_CTRL_VLAN, 19) /* Control channel VLAN filtering */ \
90 _ (VIRTIO_NET_F_CTRL_RX_EXTRA, 20) /* Extra RX mode control support */ \
91 _ (VIRTIO_NET_F_GUEST_ANNOUNCE, 21) /* Guest can announce device on the network */ \
92 _ (VIRTIO_NET_F_MQ, 22) /* Device supports Receive Flow Steering */ \
93 _ (VIRTIO_NET_F_CTRL_MAC_ADDR, 23) /* Set MAC address */ \
94 _ (VIRTIO_F_NOTIFY_ON_EMPTY, 24) \
95 _ (VHOST_F_LOG_ALL, 26) /* Log all write descriptors */ \
96 _ (VIRTIO_F_ANY_LAYOUT, 27) /* Can the device handle any descripor layout */ \
97 _ (VIRTIO_RING_F_INDIRECT_DESC, 28) /* Support indirect buffer descriptors */ \
98 _ (VIRTIO_RING_F_EVENT_IDX, 29) /* The Guest publishes the used index for which it expects an interrupt \
99 * at the end of the avail ring. Host should ignore the avail->flags field. */ \
100 /* The Host publishes the avail index for which it expects a kick \
101 * at the end of the used ring. Guest should ignore the used->flags field. */ \
102 _ (VHOST_USER_F_PROTOCOL_FEATURES, 30)
104 #define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
105 #define VIRTIO_NET_F_MTU 3
106 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
107 #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
110 * Control network offloads
111 * Reconfigures the network offloads that Guest can handle.
112 * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
113 * Command data format matches the feature bit mask exactly.
114 * See VIRTIO_NET_F_GUEST_* for the list of offloads
115 * that can be enabled/disabled.
117 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
118 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
120 /* Common configuration */
121 #define VIRTIO_PCI_CAP_COMMON_CFG 1
123 #define VIRTIO_PCI_CAP_NOTIFY_CFG 2
125 #define VIRTIO_PCI_CAP_ISR_CFG 3
126 /* Device specific configuration */
127 #define VIRTIO_PCI_CAP_DEVICE_CFG 4
128 /* PCI configuration access */
129 #define VIRTIO_PCI_CAP_PCI_CFG 5
131 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
133 #define VIRTIO_PCI_VRING_ALIGN 4096
137 VIRTIO_MSIX_NONE = 0,
138 VIRTIO_MSIX_DISABLED = 1,
139 VIRTIO_MSIX_ENABLED = 2
140 } virtio_msix_status_t;
142 /* This is the PCI capability header: */
145 u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
146 u8 cap_next; /* Generic PCI field: next ptr. */
147 u8 cap_len; /* Generic PCI field: capability length */
148 u8 cfg_type; /* Identifies the structure. */
149 u8 bar; /* Where to find it. */
150 u8 padding[3]; /* Pad to full dword. */
151 u32 offset; /* Offset within bar. */
152 u32 length; /* Length of the structure, in bytes. */
157 struct virtio_pci_cap cap;
158 u32 notify_off_multiplier; /* Multiplier for queue_notify_off. */
159 } virtio_pci_notify_cap_t;
161 /* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
164 /* About the whole device. */
165 u32 device_feature_select; /* read-write */
166 u32 device_feature; /* read-only */
167 u32 guest_feature_select; /* read-write */
168 u32 guest_feature; /* read-write */
169 u16 msix_config; /* read-write */
170 u16 num_queues; /* read-only */
171 u8 device_status; /* read-write */
172 u8 config_generation; /* read-only */
174 /* About a specific virtqueue. */
175 u16 queue_select; /* read-write */
176 u16 queue_size; /* read-write, power of 2. */
177 u16 queue_msix_vector; /* read-write */
178 u16 queue_enable; /* read-write */
179 u16 queue_notify_off; /* read-only */
180 u32 queue_desc_lo; /* read-write */
181 u32 queue_desc_hi; /* read-write */
182 u32 queue_avail_lo; /* read-write */
183 u32 queue_avail_hi; /* read-write */
184 u32 queue_used_lo; /* read-write */
185 u32 queue_used_hi; /* read-write */
186 } virtio_pci_common_cfg_t;
201 /* u16 used_event; */
214 vring_used_elem_t ring[0];
215 /* u16 avail_event; */
228 u8 checksum_offload_enabled;
230 } virtio_pci_create_if_args_t;
232 extern void debug_device_config_space (vlib_main_t * vm, virtio_if_t * vif);
233 extern void device_status (vlib_main_t * vm, virtio_if_t * vif);
234 void virtio_pci_create_if (vlib_main_t * vm,
235 virtio_pci_create_if_args_t * args);
236 int virtio_pci_delete_if (vlib_main_t * vm, virtio_if_t * ad);
237 int virtio_pci_enable_disable_offloads (vlib_main_t * vm, virtio_if_t * vif,
239 int checksum_offload_enabled,
240 int offloads_disabled);
241 #endif /* __included_virtio_pci_h__ */
243 * fd.io coding-style-patch-verification: ON
246 * eval: (c-set-style "gnu")