1/*- 2 * This header is BSD licensed so anyone can use the definitions to implement 3 * compatible drivers/servers. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of IBM nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#ifndef _VIRTIO_NET_H 32#define _VIRTIO_NET_H 33 34/* The feature bitmap for virtio net */ 35#define VIRTIO_NET_F_CSUM 0x00001 /* Host handles pkts w/ partial csum */ 36#define VIRTIO_NET_F_GUEST_CSUM 0x00002 /* Guest handles pkts w/ partial csum*/ 37#define VIRTIO_NET_F_MTU 0x00008 /* Initial MTU advice. */ 38#define VIRTIO_NET_F_MAC 0x00020 /* Host has given MAC address. */ 39#define VIRTIO_NET_F_GSO 0x00040 /* Host handles pkts w/ any GSO type */ 40#define VIRTIO_NET_F_GUEST_TSO4 0x00080 /* Guest can handle TSOv4 in. */ 41#define VIRTIO_NET_F_GUEST_TSO6 0x00100 /* Guest can handle TSOv6 in. */ 42#define VIRTIO_NET_F_GUEST_ECN 0x00200 /* Guest can handle TSO[6] w/ ECN in.*/ 43#define VIRTIO_NET_F_GUEST_UFO 0x00400 /* Guest can handle UFO in. */ 44#define VIRTIO_NET_F_HOST_TSO4 0x00800 /* Host can handle TSOv4 in. */ 45#define VIRTIO_NET_F_HOST_TSO6 0x01000 /* Host can handle TSOv6 in. */ 46#define VIRTIO_NET_F_HOST_ECN 0x02000 /* Host can handle TSO[6] w/ ECN in. */ 47#define VIRTIO_NET_F_HOST_UFO 0x04000 /* Host can handle UFO in. */ 48#define VIRTIO_NET_F_MRG_RXBUF 0x08000 /* Host can merge receive buffers. */ 49#define VIRTIO_NET_F_STATUS 0x10000 /* virtio_net_config.status available*/ 50#define VIRTIO_NET_F_CTRL_VQ 0x20000 /* Control channel available */ 51#define VIRTIO_NET_F_CTRL_RX 0x40000 /* Control channel RX mode support */ 52#define VIRTIO_NET_F_CTRL_VLAN 0x80000 /* Control channel VLAN filtering */ 53#define VIRTIO_NET_F_CTRL_RX_EXTRA 0x100000 /* Extra RX mode control support */ 54#define VIRTIO_NET_F_GUEST_ANNOUNCE 0x200000 /* Announce device on network */ 55#define VIRTIO_NET_F_MQ 0x400000 /* Device supports RFS */ 56#define VIRTIO_NET_F_CTRL_MAC_ADDR 0x800000 /* Set MAC address */ 57#define VIRTIO_NET_F_SPEED_DUPLEX (1ULL << 63) /* Device set linkspeed and duplex */ 58 59#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ 60#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ 61 62struct virtio_net_config { 63 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 64 uint8_t mac[ETHER_ADDR_LEN]; 65 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ 66 uint16_t status; 67 /* Maximum number of each of transmit and receive queues; 68 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. 69 * Legal values are between 1 and 0x8000. 70 */ 71 uint16_t max_virtqueue_pairs; 72 uint16_t mtu; 73 uint32_t speed; 74 uint8_t duplex; 75} _PACKED; 76 77/* 78 * This is the first element of the scatter-gather list. If you don't 79 * specify GSO or CSUM features, you can simply ignore the header. 80 */ 81struct virtio_net_hdr { 82#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start,csum_offset*/ 83#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */ 84 uint8_t flags; 85#define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */ 86#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */ 87#define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */ 88#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */ 89#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */ 90 uint8_t gso_type; 91 uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 92 uint16_t gso_size; /* Bytes to append to hdr_len per frame */ 93 uint16_t csum_start; /* Position to start checksumming from */ 94 uint16_t csum_offset; /* Offset after that to place checksum */ 95}; 96 97/* 98 * This is the version of the header to use when the MRG_RXBUF 99 * feature has been negotiated. 100 */ 101struct virtio_net_hdr_mrg_rxbuf { 102 struct virtio_net_hdr hdr; 103 uint16_t num_buffers; /* Number of merged rx buffers */ 104}; 105 106/* 107 * Control virtqueue data structures 108 * 109 * The control virtqueue expects a header in the first sg entry 110 * and an ack/status response in the last entry. Data for the 111 * command goes in between. 112 */ 113struct virtio_net_ctrl_hdr { 114 uint8_t net_class; // was renamed from class for c++ 115 uint8_t cmd; 116} _PACKED; 117 118#define VIRTIO_NET_OK 0 119#define VIRTIO_NET_ERR 1 120 121/* 122 * Control the RX mode, ie. promiscuous, allmulti, etc... 123 * All commands require an "out" sg entry containing a 1 byte 124 * state value, zero = disable, non-zero = enable. Commands 125 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. 126 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. 127 */ 128#define VIRTIO_NET_CTRL_RX 0 129#define VIRTIO_NET_CTRL_RX_PROMISC 0 130#define VIRTIO_NET_CTRL_RX_ALLMULTI 1 131#define VIRTIO_NET_CTRL_RX_ALLUNI 2 132#define VIRTIO_NET_CTRL_RX_NOMULTI 3 133#define VIRTIO_NET_CTRL_RX_NOUNI 4 134#define VIRTIO_NET_CTRL_RX_NOBCAST 5 135 136/* 137 * Control the MAC filter table. 138 * 139 * The MAC filter table is managed by the hypervisor, the guest should 140 * assume the size is infinite. Filtering should be considered 141 * non-perfect, ie. based on hypervisor resources, the guest may 142 * received packets from sources not specified in the filter list. 143 * 144 * In addition to the class/cmd header, the TABLE_SET command requires 145 * two out scatterlists. Each contains a 4 byte count of entries followed 146 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The 147 * first sg list contains unicast addresses, the second is for multicast. 148 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature 149 * is available. 150 * 151 * The ADDR_SET command requests one out scatterlist, it contains a 152 * 6 bytes MAC address. This functionality is present if the 153 * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. 154 */ 155struct virtio_net_ctrl_mac { 156 uint32_t entries; 157 uint8_t macs[][ETHER_ADDR_LEN]; 158} _PACKED; 159 160#define VIRTIO_NET_CTRL_MAC 1 161#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 162#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 163 164/* 165 * Control VLAN filtering 166 * 167 * The VLAN filter table is controlled via a simple ADD/DEL interface. 168 * VLAN IDs not added may be filtered by the hypervisor. Del is the 169 * opposite of add. Both commands expect an out entry containing a 2 170 * byte VLAN ID. VLAN filtering is available with the 171 * VIRTIO_NET_F_CTRL_VLAN feature bit. 172 */ 173#define VIRTIO_NET_CTRL_VLAN 2 174#define VIRTIO_NET_CTRL_VLAN_ADD 0 175#define VIRTIO_NET_CTRL_VLAN_DEL 1 176 177/* 178 * Control link announce acknowledgement 179 * 180 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that 181 * driver has recevied the notification; device would clear the 182 * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives 183 * this command. 184 */ 185#define VIRTIO_NET_CTRL_ANNOUNCE 3 186#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 187 188/* 189 * Control Receive Flow Steering 190 * 191 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET enables Receive Flow 192 * Steering, specifying the number of the transmit and receive queues 193 * that will be used. After the command is consumed and acked by the 194 * device, the device will not steer new packets on receive virtqueues 195 * other than specified nor read from transmit virtqueues other than 196 * specified. Accordingly, driver should not transmit new packets on 197 * virtqueues other than specified. 198 */ 199struct virtio_net_ctrl_mq { 200 uint16_t virtqueue_pairs; 201} _PACKED; 202 203#define VIRTIO_NET_CTRL_MQ 4 204#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 205#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 206#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 207 208#endif /* _VIRTIO_NET_H */ 209