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virtio_net.h
#ifndef _LINUX_VIRTIO_NET_H #define _LINUX_VIRTIO_NET_H /* This header is BSD licensed so anyone can use the definitions to implement * compatible drivers/servers. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of IBM nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <linux/types.h> #include <linux/virtio_ids.h> #include <linux/virtio_config.h> #include <linux/virtio_types.h> #include <linux/if_ether.h> /* The feature bitmap for virtio net */ #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ #define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Dynamic offload configuration. */ #define VIRTIO_NET_F_MTU 3 /* Initial MTU advice */ #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */ #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */ #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */ #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */ #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */ #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the * network */ #define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow * Steering */ #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ #define VIRTIO_NET_F_NOTF_COAL 53 /* Device supports notifications coalescing */ #define VIRTIO_NET_F_GUEST_USO4 54 /* Guest can handle USOv4 in. */ #define VIRTIO_NET_F_GUEST_USO6 55 /* Guest can handle USOv6 in. */ #define VIRTIO_NET_F_HOST_USO 56 /* Host can handle USO in. */ #define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */ #define VIRTIO_NET_F_GUEST_HDRLEN 59 /* Guest provides the exact hdr_len value. */ #define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */ #define VIRTIO_NET_F_RSC_EXT 61 /* extended coalescing info */ #define VIRTIO_NET_F_STANDBY 62 /* Act as standby for another device * with the same MAC. */ #define VIRTIO_NET_F_SPEED_DUPLEX 63 /* Device set linkspeed and duplex */ #ifndef VIRTIO_NET_NO_LEGACY #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ #endif /* VIRTIO_NET_NO_LEGACY */ #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ /* supported/enabled hash types */ #define VIRTIO_NET_RSS_HASH_TYPE_IPv4 (1 << 0) #define VIRTIO_NET_RSS_HASH_TYPE_TCPv4 (1 << 1) #define VIRTIO_NET_RSS_HASH_TYPE_UDPv4 (1 << 2) #define VIRTIO_NET_RSS_HASH_TYPE_IPv6 (1 << 3) #define VIRTIO_NET_RSS_HASH_TYPE_TCPv6 (1 << 4) #define VIRTIO_NET_RSS_HASH_TYPE_UDPv6 (1 << 5) #define VIRTIO_NET_RSS_HASH_TYPE_IP_EX (1 << 6) #define VIRTIO_NET_RSS_HASH_TYPE_TCP_EX (1 << 7) #define VIRTIO_NET_RSS_HASH_TYPE_UDP_EX (1 << 8) struct virtio_net_config { /* The config defining mac address (if VIRTIO_NET_F_MAC) */ __u8 mac[ETH_ALEN]; /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ __virtio16 status; /* Maximum number of each of transmit and receive queues; * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. * Legal values are between 1 and 0x8000 */ __virtio16 max_virtqueue_pairs; /* Default maximum transmit unit advice */ __virtio16 mtu; /* * speed, in units of 1Mb. All values 0 to INT_MAX are legal. * Any other value stands for unknown. */ __le32 speed; /* * 0x00 - half duplex * 0x01 - full duplex * Any other value stands for unknown. */ __u8 duplex; /* maximum size of RSS key */ __u8 rss_max_key_size; /* maximum number of indirection table entries */ __le16 rss_max_indirection_table_length; /* bitmask of supported VIRTIO_NET_RSS_HASH_ types */ __le32 supported_hash_types; } __attribute__((packed)); /* * This header comes first in the scatter-gather list. If you don't * specify GSO or CSUM features, you can simply ignore the header. * * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf, * only flattened. */ struct virtio_net_hdr_v1 { #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */ #define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */ #define VIRTIO_NET_HDR_F_RSC_INFO 4 /* rsc info in csum_ fields */ __u8 flags; #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */ #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */ #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */ #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */ #define VIRTIO_NET_HDR_GSO_UDP_L4 5 /* GSO frame, IPv4& IPv6 UDP (USO) */ #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */ __u8 gso_type; __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ union { struct { __virtio16 csum_start; __virtio16 csum_offset; }; /* Checksum calculation */ struct { /* Position to start checksumming from */ __virtio16 start; /* Offset after that to place checksum */ __virtio16 offset; } csum; /* Receive Segment Coalescing */ struct { /* Number of coalesced segments */ __le16 segments; /* Number of duplicated acks */ __le16 dup_acks; } rsc; }; __virtio16 num_buffers; /* Number of merged rx buffers */ }; struct virtio_net_hdr_v1_hash { struct virtio_net_hdr_v1 hdr; __le32 hash_value; #define VIRTIO_NET_HASH_REPORT_NONE 0 #define VIRTIO_NET_HASH_REPORT_IPv4 1 #define VIRTIO_NET_HASH_REPORT_TCPv4 2 #define VIRTIO_NET_HASH_REPORT_UDPv4 3 #define VIRTIO_NET_HASH_REPORT_IPv6 4 #define VIRTIO_NET_HASH_REPORT_TCPv6 5 #define VIRTIO_NET_HASH_REPORT_UDPv6 6 #define VIRTIO_NET_HASH_REPORT_IPv6_EX 7 #define VIRTIO_NET_HASH_REPORT_TCPv6_EX 8 #define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9 __le16 hash_report; __le16 padding; }; #ifndef VIRTIO_NET_NO_LEGACY /* This header comes first in the scatter-gather list. * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must * be the first element of the scatter-gather list. If you don't * specify GSO or CSUM features, you can simply ignore the header. */ struct virtio_net_hdr { /* See VIRTIO_NET_HDR_F_* */ __u8 flags; /* See VIRTIO_NET_HDR_GSO_* */ __u8 gso_type; __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ __virtio16 csum_start; /* Position to start checksumming from */ __virtio16 csum_offset; /* Offset after that to place checksum */ }; /* This is the version of the header to use when the MRG_RXBUF * feature has been negotiated. */ struct virtio_net_hdr_mrg_rxbuf { struct virtio_net_hdr hdr; __virtio16 num_buffers; /* Number of merged rx buffers */ }; #endif /* ...VIRTIO_NET_NO_LEGACY */ /* * Control virtqueue data structures * * The control virtqueue expects a header in the first sg entry * and an ack/status response in the last entry. Data for the * command goes in between. */ struct virtio_net_ctrl_hdr { __u8 class; __u8 cmd; } __attribute__((packed)); typedef __u8 virtio_net_ctrl_ack; #define VIRTIO_NET_OK 0 #define VIRTIO_NET_ERR 1 /* * Control the RX mode, ie. promisucous, allmulti, etc... * All commands require an "out" sg entry containing a 1 byte * state value, zero = disable, non-zero = enable. Commands * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. */ #define VIRTIO_NET_CTRL_RX 0 #define VIRTIO_NET_CTRL_RX_PROMISC 0 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 #define VIRTIO_NET_CTRL_RX_ALLUNI 2 #define VIRTIO_NET_CTRL_RX_NOMULTI 3 #define VIRTIO_NET_CTRL_RX_NOUNI 4 #define VIRTIO_NET_CTRL_RX_NOBCAST 5 /* * Control the MAC * * The MAC filter table is managed by the hypervisor, the guest should * assume the size is infinite. Filtering should be considered * non-perfect, ie. based on hypervisor resources, the guest may * received packets from sources not specified in the filter list. * * In addition to the class/cmd header, the TABLE_SET command requires * two out scatterlists. Each contains a 4 byte count of entries followed * by a concatenated byte stream of the ETH_ALEN MAC addresses. The * first sg list contains unicast addresses, the second is for multicast. * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature * is available. * * The ADDR_SET command requests one out scatterlist, it contains a * 6 bytes MAC address. This functionality is present if the * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. */ struct virtio_net_ctrl_mac { __virtio32 entries; __u8 macs[][ETH_ALEN]; } __attribute__((packed)); #define VIRTIO_NET_CTRL_MAC 1 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 /* * Control VLAN filtering * * The VLAN filter table is controlled via a simple ADD/DEL interface. * VLAN IDs not added may be filterd by the hypervisor. Del is the * opposite of add. Both commands expect an out entry containing a 2 * byte VLAN ID. VLAN filterting is available with the * VIRTIO_NET_F_CTRL_VLAN feature bit. */ #define VIRTIO_NET_CTRL_VLAN 2 #define VIRTIO_NET_CTRL_VLAN_ADD 0 #define VIRTIO_NET_CTRL_VLAN_DEL 1 /* * Control link announce acknowledgement * * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that * driver has recevied the notification; device would clear the * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives * this command. */ #define VIRTIO_NET_CTRL_ANNOUNCE 3 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 /* * Control Receive Flow Steering */ #define VIRTIO_NET_CTRL_MQ 4 /* * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET * enables Receive Flow Steering, specifying the number of the transmit and * receive queues that will be used. After the command is consumed and acked by * the device, the device will not steer new packets on receive virtqueues * other than specified nor read from transmit virtqueues other than specified. * Accordingly, driver should not transmit new packets on virtqueues other than * specified. */ struct virtio_net_ctrl_mq { __virtio16 virtqueue_pairs; }; #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 /* * The command VIRTIO_NET_CTRL_MQ_RSS_CONFIG has the same effect as * VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET does and additionally configures * the receive steering to use a hash calculated for incoming packet * to decide on receive virtqueue to place the packet. The command * also provides parameters to calculate a hash and receive virtqueue. */ struct virtio_net_rss_config { __le32 hash_types; __le16 indirection_table_mask; __le16 unclassified_queue; __le16 indirection_table[1/* + indirection_table_mask */]; __le16 max_tx_vq; __u8 hash_key_length; __u8 hash_key_data[/* hash_key_length */]; }; #define VIRTIO_NET_CTRL_MQ_RSS_CONFIG 1 /* * The command VIRTIO_NET_CTRL_MQ_HASH_CONFIG requests the device * to include in the virtio header of the packet the value of the * calculated hash and the report type of hash. It also provides * parameters for hash calculation. The command requires feature * VIRTIO_NET_F_HASH_REPORT to be negotiated to extend the * layout of virtio header as defined in virtio_net_hdr_v1_hash. */ struct virtio_net_hash_config { __le32 hash_types; /* for compatibility with virtio_net_rss_config */ __le16 reserved[4]; __u8 hash_key_length; __u8 hash_key_data[/* hash_key_length */]; }; #define VIRTIO_NET_CTRL_MQ_HASH_CONFIG 2 /* * Control network offloads * * Reconfigures the network offloads that Guest can handle. * * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit. * * Command data format matches the feature bit mask exactly. * * See VIRTIO_NET_F_GUEST_* for the list of offloads * that can be enabled/disabled. */ #define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0 /* * Control notifications coalescing. * * Request the device to change the notifications coalescing parameters. * * Available with the VIRTIO_NET_F_NOTF_COAL feature bit. */ #define VIRTIO_NET_CTRL_NOTF_COAL 6 /* * Set the tx-usecs/tx-max-packets parameters. */ struct virtio_net_ctrl_coal_tx { /* Maximum number of packets to send before a TX notification */ __le32 tx_max_packets; /* Maximum number of usecs to delay a TX notification */ __le32 tx_usecs; }; #define VIRTIO_NET_CTRL_NOTF_COAL_TX_SET 0 /* * Set the rx-usecs/rx-max-packets parameters. */ struct virtio_net_ctrl_coal_rx { /* Maximum number of packets to receive before a RX notification */ __le32 rx_max_packets; /* Maximum number of usecs to delay a RX notification */ __le32 rx_usecs; }; #define VIRTIO_NET_CTRL_NOTF_COAL_RX_SET 1 #endif /* _LINUX_VIRTIO_NET_H */
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