/* * Virtio Network Device * * Copyright IBM, Corp. 2007 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #ifndef _QEMU_VIRTIO_NET_H #define _QEMU_VIRTIO_NET_H #include "hw/virtio.h" #include "hw/pci/pci.h" #define ETH_ALEN 6 /* from Linux's virtio_net.h */ /* The ID for virtio_net */ #define VIRTIO_ID_NET 1 /* 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_MAC 5 /* Host has given MAC address. */ #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ #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_MQ 22 /* Device supports Receive Flow * Steering */ #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ #define TX_TIMER_INTERVAL 150000 /* 150 us */ /* Limit the number of packets that can be sent via a single flush * of the TX queue. This gives us a guaranteed exit condition and * ensures fairness in the io path. 256 conveniently matches the * length of the TX queue and shows a good balance of performance * and latency. */ #define TX_BURST 256 typedef struct virtio_net_conf { uint32_t txtimer; int32_t txburst; char *tx; } virtio_net_conf; /* Maximum packet size we can receive from tap device: header + 64k */ #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10)) struct virtio_net_config { /* The config defining mac address ($ETH_ALEN bytes) */ uint8_t mac[ETH_ALEN]; /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ uint16_t status; /* Max virtqueue pairs supported by the device */ uint16_t max_virtqueue_pairs; } QEMU_PACKED; /* * 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 { uint8_t class; uint8_t cmd; }; typedef uint8_t 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 { uint32_t entries; uint8_t macs[][ETH_ALEN]; }; #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 Multiqueue * * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET * enables multiqueue, 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 { uint16_t virtqueue_pairs; }; #define VIRTIO_NET_CTRL_MQ 4 #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 #define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \ DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \ DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM, true), \ DEFINE_PROP_BIT("guest_csum", _state, _field, VIRTIO_NET_F_GUEST_CSUM, true), \ DEFINE_PROP_BIT("gso", _state, _field, VIRTIO_NET_F_GSO, true), \ DEFINE_PROP_BIT("guest_tso4", _state, _field, VIRTIO_NET_F_GUEST_TSO4, true), \ DEFINE_PROP_BIT("guest_tso6", _state, _field, VIRTIO_NET_F_GUEST_TSO6, true), \ DEFINE_PROP_BIT("guest_ecn", _state, _field, VIRTIO_NET_F_GUEST_ECN, true), \ DEFINE_PROP_BIT("guest_ufo", _state, _field, VIRTIO_NET_F_GUEST_UFO, true), \ DEFINE_PROP_BIT("host_tso4", _state, _field, VIRTIO_NET_F_HOST_TSO4, true), \ DEFINE_PROP_BIT("host_tso6", _state, _field, VIRTIO_NET_F_HOST_TSO6, true), \ DEFINE_PROP_BIT("host_ecn", _state, _field, VIRTIO_NET_F_HOST_ECN, true), \ DEFINE_PROP_BIT("host_ufo", _state, _field, VIRTIO_NET_F_HOST_UFO, true), \ DEFINE_PROP_BIT("mrg_rxbuf", _state, _field, VIRTIO_NET_F_MRG_RXBUF, true), \ DEFINE_PROP_BIT("status", _state, _field, VIRTIO_NET_F_STATUS, true), \ DEFINE_PROP_BIT("ctrl_vq", _state, _field, VIRTIO_NET_F_CTRL_VQ, true), \ DEFINE_PROP_BIT("ctrl_rx", _state, _field, VIRTIO_NET_F_CTRL_RX, true), \ DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \ DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true), \ DEFINE_PROP_BIT("ctrl_mac_addr", _state, _field, VIRTIO_NET_F_CTRL_MAC_ADDR, true), \ DEFINE_PROP_BIT("mq", _state, _field, VIRTIO_NET_F_MQ, false) #endif