2 * Copyright (c) 2015 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.
15 #ifndef __VIRTIO_STD_H__
16 #define __VIRTIO_STD_H__
18 #define foreach_virtio_net_features \
19 _ (VIRTIO_NET_F_CSUM, 0) /* Host handles pkts w/ partial csum */ \
20 _ (VIRTIO_NET_F_GUEST_CSUM, 1) /* Guest handles pkts w/ partial csum */ \
21 _ (VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, 2) /* Dynamic offload configuration. */ \
22 _ (VIRTIO_NET_F_MTU, 3) /* Initial MTU advice. */ \
23 _ (VIRTIO_NET_F_MAC, 5) /* Host has given MAC address. */ \
24 _ (VIRTIO_NET_F_GSO, 6) /* Host handles pkts w/ any GSO. */ \
25 _ (VIRTIO_NET_F_GUEST_TSO4, 7) /* Guest can handle TSOv4 in. */ \
26 _ (VIRTIO_NET_F_GUEST_TSO6, 8) /* Guest can handle TSOv6 in. */ \
27 _ (VIRTIO_NET_F_GUEST_ECN, 9) /* Guest can handle TSO[6] w/ ECN in. */ \
28 _ (VIRTIO_NET_F_GUEST_UFO, 10) /* Guest can handle UFO in. */ \
29 _ (VIRTIO_NET_F_HOST_TSO4, 11) /* Host can handle TSOv4 in. */ \
30 _ (VIRTIO_NET_F_HOST_TSO6, 12) /* Host can handle TSOv6 in. */ \
31 _ (VIRTIO_NET_F_HOST_ECN, 13) /* Host can handle TSO[6] w/ ECN in. */ \
32 _ (VIRTIO_NET_F_HOST_UFO, 14) /* Host can handle UFO in. */ \
33 _ (VIRTIO_NET_F_MRG_RXBUF, 15) /* Host can merge receive buffers. */ \
34 _ (VIRTIO_NET_F_STATUS, 16) /* virtio_net_config.status available */ \
35 _ (VIRTIO_NET_F_CTRL_VQ, 17) /* Control channel available */ \
36 _ (VIRTIO_NET_F_CTRL_RX, 18) /* Control channel RX mode support */ \
37 _ (VIRTIO_NET_F_CTRL_VLAN, 19) /* Control channel VLAN filtering */ \
38 _ (VIRTIO_NET_F_CTRL_RX_EXTRA, 20) /* Extra RX mode control support */ \
39 _ (VIRTIO_NET_F_GUEST_ANNOUNCE, 21) /* Guest can announce device on the network */ \
40 _ (VIRTIO_NET_F_MQ, 22) /* Device supports Receive Flow Steering */ \
41 _ (VIRTIO_NET_F_CTRL_MAC_ADDR, 23) /* Set MAC address */ \
42 _ (VIRTIO_F_NOTIFY_ON_EMPTY, 24) \
43 _ (VHOST_F_LOG_ALL, 26) /* Log all write descriptors */ \
44 _ (VIRTIO_F_ANY_LAYOUT, 27) /* Can the device handle any descriptor layout */ \
45 _ (VIRTIO_RING_F_INDIRECT_DESC, 28) /* Support indirect buffer descriptors */ \
46 _ (VIRTIO_RING_F_EVENT_IDX, 29) /* The Guest publishes the used index for which it expects an interrupt \
47 * at the end of the avail ring. Host should ignore the avail->flags field. */ \
48 /* The Host publishes the avail index for which it expects a kick \
49 * at the end of the used ring. Guest should ignore the used->flags field. */ \
50 _ (VHOST_USER_F_PROTOCOL_FEATURES, 30) \
51 _ (VIRTIO_F_VERSION_1, 32) /* v1.0 compliant. */ \
52 _ (VIRTIO_F_IOMMU_PLATFORM, 33) \
53 _ (VIRTIO_F_RING_PACKED, 34) \
54 _ (VIRTIO_F_IN_ORDER, 35) /* all buffers are used by the device in the */ \
55 /* same order in which they have been made available */ \
56 _ (VIRTIO_F_ORDER_PLATFORM, 36) /* memory accesses by the driver and the */ \
57 /* device are ordered in a way described by the platfor */ \
58 _ (VIRTIO_F_NOTIFICATION_DATA, 38) /* the driver passes extra data (besides */ \
59 /* identifying the virtqueue) in its device notifications. */ \
60 _ (VIRTIO_NET_F_SPEED_DUPLEX, 63) /* Device set linkspeed and duplex */
65 foreach_virtio_net_features
67 } virtio_net_feature_t;
69 #define VIRTIO_FEATURE(X) (1ULL << X)
71 #define VRING_MAX_SIZE 32768
73 #define VRING_DESC_F_NEXT 1
74 #define VRING_DESC_F_WRITE 2
75 #define VRING_DESC_F_INDIRECT 4
77 #define VRING_DESC_F_AVAIL (1 << 7)
78 #define VRING_DESC_F_USED (1 << 15)
80 #define foreach_virtio_event_idx_flags \
81 _ (VRING_EVENT_F_ENABLE, 0) \
82 _ (VRING_EVENT_F_DISABLE, 1) \
83 _ (VRING_EVENT_F_DESC, 2)
88 foreach_virtio_event_idx_flags
90 } virtio_event_idx_flags_t;
92 #define VRING_USED_F_NO_NOTIFY 1
93 #define VRING_AVAIL_F_NO_INTERRUPT 1
108 /* u16 used_event; */
121 vring_used_elem_t ring[0];
122 /* u16 avail_event; */
126 typedef CLIB_PACKED (struct
128 u64 addr; // packet data buffer address
129 u32 len; // packet data buffer size
132 }) vring_packed_desc_t;
134 STATIC_ASSERT_SIZEOF (vring_packed_desc_t, 16);
136 typedef CLIB_PACKED (struct
140 }) vring_desc_event_t;
142 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
143 #define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
145 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
146 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
147 #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
148 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
149 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
151 typedef CLIB_PACKED (struct
155 u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
156 u16 gso_size; /* Bytes to append to hdr_len per frame */
157 u16 csum_start; /* Position to start checksumming from */
158 u16 csum_offset; /* Offset after that to place checksum */
159 u16 num_buffers; /* Number of merged rx buffers */
160 }) virtio_net_hdr_v1_t;
162 typedef CLIB_PACKED (struct
172 typedef CLIB_PACKED (struct
174 virtio_net_hdr_t hdr;
176 }) virtio_net_hdr_mrg_rxbuf_t;
184 vring_avail_t *avail;
188 static_always_inline void
189 vring_init (vring_t * vr, u32 num, void *p, u32 align)
193 vr->avail = (vring_avail_t *) ((char *) p + num * sizeof (vring_desc_t));
195 (vring_used_t *) ((char *) p +
196 ((sizeof (vring_desc_t) * num +
197 sizeof (u16) * (3 + num) + align - 1) & ~(align -
201 static_always_inline u16
202 vring_size (u32 num, u32 align)
204 return ((sizeof (vring_desc_t) * num + sizeof (u16) * (3 + num)
205 + align - 1) & ~(align - 1))
206 + sizeof (u16) * 3 + sizeof (vring_used_elem_t) * num;
211 * fd.io coding-style-patch-verification: ON
214 * eval: (c-set-style "gnu")