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#define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the 53 * network */ 54#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow 55 * Steering */ 56#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ 57 58#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ 59#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ 60 61struct virtio_net_config { 62 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 63 __u8 mac[ETH_ALEN]; 64 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ 65 __u16 status; 66 /* Maximum number of each of transmit and receive queues; 67 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. 68 * Legal values are between 1 and 0x8000 69 */ 70 __u16 max_virtqueue_pairs; 71} __attribute__((packed)); 72 73/* This header comes first in the scatter-gather list. 74 * If VIRTIO_F_ANY_LAYOUT is not negotiated, it must 75 * be the first element of the scatter-gather list. If you don't 76 * specify GSO or CSUM features, you can simply ignore the header. */ 77struct virtio_net_hdr { 78#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 79#define VIRTIO_NET_HDR_F_DATA_VALID 2 // Csum is valid 80 __u8 flags; 81#define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame 82#define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) 83#define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) 84#define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP 85#define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set 86 __u8 gso_type; 87 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 88 __u16 gso_size; /* Bytes to append to hdr_len per frame */ 89 __u16 csum_start; /* Position to start checksumming from */ 90 __u16 csum_offset; /* Offset after that to place checksum */ 91}; 92 93/* This is the version of the header to use when the MRG_RXBUF 94 * feature has been negotiated. */ 95struct virtio_net_hdr_mrg_rxbuf { 96 struct virtio_net_hdr hdr; 97 __u16 num_buffers; /* Number of merged rx buffers */ 98}; 99 100/* 101 * Control virtqueue data structures 102 * 103 * The control virtqueue expects a header in the first sg entry 104 * and an ack/status response in the last entry. Data for the 105 * command goes in between. 106 */ 107struct virtio_net_ctrl_hdr { 108 __u8 class; 109 __u8 cmd; 110} __attribute__((packed)); 111 112typedef __u8 virtio_net_ctrl_ack; 113 114#define VIRTIO_NET_OK 0 115#define VIRTIO_NET_ERR 1 116 117/* 118 * Control the RX mode, ie. promisucous, allmulti, etc... 119 * All commands require an "out" sg entry containing a 1 byte 120 * state value, zero = disable, non-zero = enable. Commands 121 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. 122 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. 123 */ 124#define VIRTIO_NET_CTRL_RX 0 125 #define VIRTIO_NET_CTRL_RX_PROMISC 0 126 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 127 #define VIRTIO_NET_CTRL_RX_ALLUNI 2 128 #define VIRTIO_NET_CTRL_RX_NOMULTI 3 129 #define VIRTIO_NET_CTRL_RX_NOUNI 4 130 #define VIRTIO_NET_CTRL_RX_NOBCAST 5 131 132/* 133 * Control the MAC 134 * 135 * The MAC filter table is managed by the hypervisor, the guest should 136 * assume the size is infinite. Filtering should be considered 137 * non-perfect, ie. based on hypervisor resources, the guest may 138 * received packets from sources not specified in the filter list. 139 * 140 * In addition to the class/cmd header, the TABLE_SET command requires 141 * two out scatterlists. Each contains a 4 byte count of entries followed 142 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The 143 * first sg list contains unicast addresses, the second is for multicast. 144 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature 145 * is available. 146 * 147 * The ADDR_SET command requests one out scatterlist, it contains a 148 * 6 bytes MAC address. This functionality is present if the 149 * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. 150 */ 151struct virtio_net_ctrl_mac { 152 __u32 entries; 153 __u8 macs[][ETH_ALEN]; 154} __attribute__((packed)); 155 156#define VIRTIO_NET_CTRL_MAC 1 157 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 158 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 159 160/* 161 * Control VLAN filtering 162 * 163 * The VLAN filter table is controlled via a simple ADD/DEL interface. 164 * VLAN IDs not added may be filterd by the hypervisor. Del is the 165 * opposite of add. Both commands expect an out entry containing a 2 166 * byte VLAN ID. VLAN filterting is available with the 167 * VIRTIO_NET_F_CTRL_VLAN feature bit. 168 */ 169#define VIRTIO_NET_CTRL_VLAN 2 170 #define VIRTIO_NET_CTRL_VLAN_ADD 0 171 #define VIRTIO_NET_CTRL_VLAN_DEL 1 172 173/* 174 * Control link announce acknowledgement 175 * 176 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that 177 * driver has recevied the notification; device would clear the 178 * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives 179 * this command. 180 */ 181#define VIRTIO_NET_CTRL_ANNOUNCE 3 182 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 183 184/* 185 * Control Receive Flow Steering 186 * 187 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 188 * enables Receive Flow Steering, specifying the number of the transmit and 189 * receive queues that will be used. After the command is consumed and acked by 190 * the device, the device will not steer new packets on receive virtqueues 191 * other than specified nor read from transmit virtqueues other than specified. 192 * Accordingly, driver should not transmit new packets on virtqueues other than 193 * specified. 194 */ 195struct virtio_net_ctrl_mq { 196 __u16 virtqueue_pairs; 197}; 198 199#define VIRTIO_NET_CTRL_MQ 4 200 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 201 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 202 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 203 204#endif /* _LINUX_VIRTIO_NET_H */ 205