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1 | #ifndef _LINUX_VIRTIO_NET_H |
2 | #define _LINUX_VIRTIO_NET_H |
3 | /* This header is BSD licensed so anyone can use the definitions to implement |
4 | * compatible drivers/servers. |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
9 | * 1. Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * 2. Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
14 | * 3. Neither the name of IBM nor the names of its contributors |
15 | * may be used to endorse or promote products derived from this software |
16 | * without specific prior written permission. |
17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
27 | * SUCH DAMAGE. */ |
28 | #include <linux/types.h> |
29 | #include <linux/virtio_ids.h> |
30 | #include <linux/virtio_config.h> |
31 | #include <linux/if_ether.h> |
32 | |
33 | /* The feature bitmap for virtio net */ |
34 | #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ |
35 | #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ |
36 | #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ |
37 | #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ |
38 | #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ |
39 | #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ |
40 | #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ |
41 | #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ |
42 | #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ |
43 | #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ |
44 | #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ |
45 | #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ |
46 | #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ |
47 | #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */ |
48 | #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */ |
49 | #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */ |
50 | #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */ |
51 | #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */ |
52 | |
53 | #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ |
54 | |
55 | struct virtio_net_config { |
56 | /* The config defining mac address (if VIRTIO_NET_F_MAC) */ |
57 | __u8 mac[6]; |
58 | /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ |
59 | __u16 status; |
60 | } __attribute__((packed)); |
61 | |
62 | /* This is the first element of the scatter-gather list. If you don't |
63 | * specify GSO or CSUM features, you can simply ignore the header. */ |
64 | struct virtio_net_hdr { |
65 | #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset |
66 | __u8 flags; |
67 | #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame |
68 | #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) |
69 | #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) |
70 | #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP |
71 | #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set |
72 | __u8 gso_type; |
73 | __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ |
74 | __u16 gso_size; /* Bytes to append to hdr_len per frame */ |
75 | __u16 csum_start; /* Position to start checksumming from */ |
76 | __u16 csum_offset; /* Offset after that to place checksum */ |
77 | }; |
78 | |
79 | /* This is the version of the header to use when the MRG_RXBUF |
80 | * feature has been negotiated. */ |
81 | struct virtio_net_hdr_mrg_rxbuf { |
82 | struct virtio_net_hdr hdr; |
83 | __u16 num_buffers; /* Number of merged rx buffers */ |
84 | }; |
85 | |
86 | /* |
87 | * Control virtqueue data structures |
88 | * |
89 | * The control virtqueue expects a header in the first sg entry |
90 | * and an ack/status response in the last entry. Data for the |
91 | * command goes in between. |
92 | */ |
93 | struct virtio_net_ctrl_hdr { |
94 | __u8 class; |
95 | __u8 cmd; |
96 | } __attribute__((packed)); |
97 | |
98 | typedef __u8 virtio_net_ctrl_ack; |
99 | |
100 | #define VIRTIO_NET_OK 0 |
101 | #define VIRTIO_NET_ERR 1 |
102 | |
103 | /* |
104 | * Control the RX mode, ie. promisucous, allmulti, etc... |
105 | * All commands require an "out" sg entry containing a 1 byte |
106 | * state value, zero = disable, non-zero = enable. Commands |
107 | * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. |
108 | * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. |
109 | */ |
110 | #define VIRTIO_NET_CTRL_RX 0 |
111 | #define VIRTIO_NET_CTRL_RX_PROMISC 0 |
112 | #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 |
113 | #define VIRTIO_NET_CTRL_RX_ALLUNI 2 |
114 | #define VIRTIO_NET_CTRL_RX_NOMULTI 3 |
115 | #define VIRTIO_NET_CTRL_RX_NOUNI 4 |
116 | #define VIRTIO_NET_CTRL_RX_NOBCAST 5 |
117 | |
118 | /* |
119 | * Control the MAC filter table. |
120 | * |
121 | * The MAC filter table is managed by the hypervisor, the guest should |
122 | * assume the size is infinite. Filtering should be considered |
123 | * non-perfect, ie. based on hypervisor resources, the guest may |
124 | * received packets from sources not specified in the filter list. |
125 | * |
126 | * In addition to the class/cmd header, the TABLE_SET command requires |
127 | * two out scatterlists. Each contains a 4 byte count of entries followed |
128 | * by a concatenated byte stream of the ETH_ALEN MAC addresses. The |
129 | * first sg list contains unicast addresses, the second is for multicast. |
130 | * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature |
131 | * is available. |
132 | */ |
133 | struct virtio_net_ctrl_mac { |
134 | __u32 entries; |
135 | __u8 macs[][ETH_ALEN]; |
136 | } __attribute__((packed)); |
137 | |
138 | #define VIRTIO_NET_CTRL_MAC 1 |
139 | #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 |
140 | |
141 | /* |
142 | * Control VLAN filtering |
143 | * |
144 | * The VLAN filter table is controlled via a simple ADD/DEL interface. |
145 | * VLAN IDs not added may be filterd by the hypervisor. Del is the |
146 | * opposite of add. Both commands expect an out entry containing a 2 |
147 | * byte VLAN ID. VLAN filterting is available with the |
148 | * VIRTIO_NET_F_CTRL_VLAN feature bit. |
149 | */ |
150 | #define VIRTIO_NET_CTRL_VLAN 2 |
151 | #define VIRTIO_NET_CTRL_VLAN_ADD 0 |
152 | #define VIRTIO_NET_CTRL_VLAN_DEL 1 |
153 | |
154 | #endif /* _LINUX_VIRTIO_NET_H */ |
155 |
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