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 #define VIRTIO_NET_HDR_F_DATA_VALID	2	// Csum is valid
67 	__u8 flags;
68 #define VIRTIO_NET_HDR_GSO_NONE		0	// Not a GSO frame
69 #define VIRTIO_NET_HDR_GSO_TCPV4	1	// GSO frame, IPv4 TCP (TSO)
70 #define VIRTIO_NET_HDR_GSO_UDP		3	// GSO frame, IPv4 UDP (UFO)
71 #define VIRTIO_NET_HDR_GSO_TCPV6	4	// GSO frame, IPv6 TCP
72 #define VIRTIO_NET_HDR_GSO_ECN		0x80	// TCP has ECN set
73 	__u8 gso_type;
74 	__u16 hdr_len;		/* Ethernet + IP + tcp/udp hdrs */
75 	__u16 gso_size;		/* Bytes to append to hdr_len per frame */
76 	__u16 csum_start;	/* Position to start checksumming from */
77 	__u16 csum_offset;	/* Offset after that to place checksum */
78 };
79 
80 /* This is the version of the header to use when the MRG_RXBUF
81  * feature has been negotiated. */
82 struct virtio_net_hdr_mrg_rxbuf {
83 	struct virtio_net_hdr hdr;
84 	__u16 num_buffers;	/* Number of merged rx buffers */
85 };
86 
87 /*
88  * Control virtqueue data structures
89  *
90  * The control virtqueue expects a header in the first sg entry
91  * and an ack/status response in the last entry.  Data for the
92  * command goes in between.
93  */
94 struct virtio_net_ctrl_hdr {
95 	__u8 class;
96 	__u8 cmd;
97 } __attribute__((packed));
98 
99 typedef __u8 virtio_net_ctrl_ack;
100 
101 #define VIRTIO_NET_OK     0
102 #define VIRTIO_NET_ERR    1
103 
104 /*
105  * Control the RX mode, ie. promisucous, allmulti, etc...
106  * All commands require an "out" sg entry containing a 1 byte
107  * state value, zero = disable, non-zero = enable.  Commands
108  * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
109  * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
110  */
111 #define VIRTIO_NET_CTRL_RX    0
112  #define VIRTIO_NET_CTRL_RX_PROMISC      0
113  #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
114  #define VIRTIO_NET_CTRL_RX_ALLUNI       2
115  #define VIRTIO_NET_CTRL_RX_NOMULTI      3
116  #define VIRTIO_NET_CTRL_RX_NOUNI        4
117  #define VIRTIO_NET_CTRL_RX_NOBCAST      5
118 
119 /*
120  * Control the MAC filter table.
121  *
122  * The MAC filter table is managed by the hypervisor, the guest should
123  * assume the size is infinite.  Filtering should be considered
124  * non-perfect, ie. based on hypervisor resources, the guest may
125  * received packets from sources not specified in the filter list.
126  *
127  * In addition to the class/cmd header, the TABLE_SET command requires
128  * two out scatterlists.  Each contains a 4 byte count of entries followed
129  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
130  * first sg list contains unicast addresses, the second is for multicast.
131  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
132  * is available.
133  */
134 struct virtio_net_ctrl_mac {
135 	__u32 entries;
136 	__u8 macs[][ETH_ALEN];
137 } __attribute__((packed));
138 
139 #define VIRTIO_NET_CTRL_MAC    1
140  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
141 
142 /*
143  * Control VLAN filtering
144  *
145  * The VLAN filter table is controlled via a simple ADD/DEL interface.
146  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
147  * opposite of add.  Both commands expect an out entry containing a 2
148  * byte VLAN ID.  VLAN filterting is available with the
149  * VIRTIO_NET_F_CTRL_VLAN feature bit.
150  */
151 #define VIRTIO_NET_CTRL_VLAN       2
152  #define VIRTIO_NET_CTRL_VLAN_ADD             0
153  #define VIRTIO_NET_CTRL_VLAN_DEL             1
154 
155 #endif /* _LINUX_VIRTIO_NET_H */
156