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 #include <linux/types.h> 6 #include <linux/virtio_config.h> 7 8 /* The ID for virtio_net */ 9 #define VIRTIO_ID_NET 1 10 11 /* The feature bitmap for virtio net */ 12 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ 13 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ 14 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ 15 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 16 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ 17 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ 18 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ 19 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ 20 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ 21 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ 22 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ 23 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ 24 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ 25 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */ 26 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */ 27 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */ 28 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */ 29 30 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ 31 32 struct virtio_net_config 33 { 34 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 35 __u8 mac[6]; 36 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ 37 __u16 status; 38 } __attribute__((packed)); 39 40 /* This is the first element of the scatter-gather list. If you don't 41 * specify GSO or CSUM features, you can simply ignore the header. */ 42 struct virtio_net_hdr 43 { 44 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 45 __u8 flags; 46 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame 47 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) 48 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) 49 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP 50 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set 51 __u8 gso_type; 52 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 53 __u16 gso_size; /* Bytes to append to hdr_len per frame */ 54 __u16 csum_start; /* Position to start checksumming from */ 55 __u16 csum_offset; /* Offset after that to place checksum */ 56 }; 57 58 /* This is the version of the header to use when the MRG_RXBUF 59 * feature has been negotiated. */ 60 struct virtio_net_hdr_mrg_rxbuf { 61 struct virtio_net_hdr hdr; 62 __u16 num_buffers; /* Number of merged rx buffers */ 63 }; 64 65 /* 66 * Control virtqueue data structures 67 * 68 * The control virtqueue expects a header in the first sg entry 69 * and an ack/status response in the last entry. Data for the 70 * command goes in between. 71 */ 72 struct virtio_net_ctrl_hdr { 73 __u8 class; 74 __u8 cmd; 75 } __attribute__((packed)); 76 77 typedef __u8 virtio_net_ctrl_ack; 78 79 #define VIRTIO_NET_OK 0 80 #define VIRTIO_NET_ERR 1 81 82 /* 83 * Control the RX mode, ie. promisucous and allmulti. PROMISC and 84 * ALLMULTI commands require an "out" sg entry containing a 1 byte 85 * state value, zero = disable, non-zero = enable. These commands 86 * are supported with the VIRTIO_NET_F_CTRL_RX feature. 87 */ 88 #define VIRTIO_NET_CTRL_RX 0 89 #define VIRTIO_NET_CTRL_RX_PROMISC 0 90 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 91 92 /* 93 * Control the MAC filter table. 94 * 95 * The MAC filter table is managed by the hypervisor, the guest should 96 * assume the size is infinite. Filtering should be considered 97 * non-perfect, ie. based on hypervisor resources, the guest may 98 * received packets from sources not specified in the filter list. 99 * 100 * In addition to the class/cmd header, the TABLE_SET command requires 101 * two out scatterlists. Each contains a 4 byte count of entries followed 102 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The 103 * first sg list contains unicast addresses, the second is for multicast. 104 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature 105 * is available. 106 */ 107 struct virtio_net_ctrl_mac { 108 __u32 entries; 109 __u8 macs[][ETH_ALEN]; 110 } __attribute__((packed)); 111 112 #define VIRTIO_NET_CTRL_MAC 1 113 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 114 115 /* 116 * Control VLAN filtering 117 * 118 * The VLAN filter table is controlled via a simple ADD/DEL interface. 119 * VLAN IDs not added may be filterd by the hypervisor. Del is the 120 * opposite of add. Both commands expect an out entry containing a 2 121 * byte VLAN ID. VLAN filterting is available with the 122 * VIRTIO_NET_F_CTRL_VLAN feature bit. 123 */ 124 #define VIRTIO_NET_CTRL_VLAN 2 125 #define VIRTIO_NET_CTRL_VLAN_ADD 0 126 #define VIRTIO_NET_CTRL_VLAN_DEL 1 127 128 #endif /* _LINUX_VIRTIO_NET_H */ 129