f371ad3064
This adds virtio net device driver support. Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
269 lines
8.7 KiB
C
269 lines
8.7 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
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/*
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* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*
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* From Linux kernel include/uapi/linux/virtio_net.h
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*/
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#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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/* TODO: needs to be removed! */
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#define ETH_ALEN 6
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/* The feature bitmap for virtio net */
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/* Host handles pkts w/ partial csum */
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#define VIRTIO_NET_F_CSUM 0
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/* Guest handles pkts w/ partial csum */
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#define VIRTIO_NET_F_GUEST_CSUM 1
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/* Dynamic offload configuration */
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#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
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/* Initial MTU advice */
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#define VIRTIO_NET_F_MTU 3
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/* Host has given MAC address */
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#define VIRTIO_NET_F_MAC 5
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/* Guest can handle TSOv4 in */
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#define VIRTIO_NET_F_GUEST_TSO4 7
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/* Guest can handle TSOv6 in */
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#define VIRTIO_NET_F_GUEST_TSO6 8
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/* Guest can handle TSO[6] w/ ECN in */
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#define VIRTIO_NET_F_GUEST_ECN 9
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/* Guest can handle UFO in */
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#define VIRTIO_NET_F_GUEST_UFO 10
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/* Host can handle TSOv4 in */
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#define VIRTIO_NET_F_HOST_TSO4 11
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/* Host can handle TSOv6 in */
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#define VIRTIO_NET_F_HOST_TSO6 12
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/* Host can handle TSO[6] w/ ECN in */
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#define VIRTIO_NET_F_HOST_ECN 13
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/* Host can handle UFO in */
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#define VIRTIO_NET_F_HOST_UFO 14
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/* Host can merge receive buffers */
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#define VIRTIO_NET_F_MRG_RXBUF 15
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/* virtio_net_config.status available */
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#define VIRTIO_NET_F_STATUS 16
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/* Control channel available */
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#define VIRTIO_NET_F_CTRL_VQ 17
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/* Control channel RX mode support */
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#define VIRTIO_NET_F_CTRL_RX 18
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/* Control channel VLAN filtering */
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#define VIRTIO_NET_F_CTRL_VLAN 19
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/* Extra RX mode control support */
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#define VIRTIO_NET_F_CTRL_RX_EXTRA 20
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/* Guest can announce device on the network */
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#define VIRTIO_NET_F_GUEST_ANNOUNCE 21
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/* Device supports receive flow steering */
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#define VIRTIO_NET_F_MQ 22
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/* Set MAC address */
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#define VIRTIO_NET_F_CTRL_MAC_ADDR 23
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/* Device set linkspeed and duplex */
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#define VIRTIO_NET_F_SPEED_DUPLEX 63
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#ifndef VIRTIO_NET_NO_LEGACY
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/* Host handles pkts w/ any GSO type */
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#define VIRTIO_NET_F_GSO 6
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#endif /* VIRTIO_NET_NO_LEGACY */
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#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
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#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
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struct __packed virtio_net_config {
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/* The config defining mac address (if VIRTIO_NET_F_MAC) */
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__u8 mac[ETH_ALEN];
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/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
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__u16 status;
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/*
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* Maximum number of each of transmit and receive queues;
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* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
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* Legal values are between 1 and 0x8000
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*/
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__u16 max_virtqueue_pairs;
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/* Default maximum transmit unit advice */
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__u16 mtu;
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/*
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* speed, in units of 1Mb. All values 0 to INT_MAX are legal.
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* Any other value stands for unknown.
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*/
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__u32 speed;
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/*
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* 0x00 - half duplex
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* 0x01 - full duplex
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* Any other value stands for unknown.
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*/
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__u8 duplex;
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};
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/*
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* This header comes first in the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*
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* This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
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* only flattened.
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*/
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struct virtio_net_hdr_v1 {
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 0x01 /* Use csum_start, csum_offset */
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#define VIRTIO_NET_HDR_F_DATA_VALID 0x02 /* Csum is valid */
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__u8 flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0x00 /* Not a GSO frame */
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#define VIRTIO_NET_HDR_GSO_TCPV4 0x01 /* GSO frame, IPv4 TCP (TSO) */
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#define VIRTIO_NET_HDR_GSO_UDP 0x03 /* GSO frame, IPv4 UDP (UFO) */
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#define VIRTIO_NET_HDR_GSO_TCPV6 0x04 /* GSO frame, IPv6 TCP */
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#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
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__u8 gso_type;
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__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
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__virtio16 csum_start; /* Position to start checksumming from */
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__virtio16 csum_offset; /* Offset after that to place checksum */
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__virtio16 num_buffers; /* Number of merged rx buffers */
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};
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#ifndef VIRTIO_NET_NO_LEGACY
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/*
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* This header comes first in the scatter-gather list.
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*
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* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
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* be the first element of the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*/
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struct virtio_net_hdr {
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/* See VIRTIO_NET_HDR_F_* */
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__u8 flags;
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/* See VIRTIO_NET_HDR_GSO_* */
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__u8 gso_type;
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__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
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__virtio16 csum_start; /* Position to start checksumming from */
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__virtio16 csum_offset; /* Offset after that to place checksum */
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};
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/*
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* This is the version of the header to use when the MRG_RXBUF
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* feature has been negotiated.
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*/
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struct virtio_net_hdr_mrg_rxbuf {
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struct virtio_net_hdr hdr;
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__virtio16 num_buffers; /* Number of merged rx buffers */
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};
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#endif /* ...VIRTIO_NET_NO_LEGACY */
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/*
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* Control virtqueue data structures
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*
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* The control virtqueue expects a header in the first sg entry
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* and an ack/status response in the last entry. Data for the
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* command goes in between.
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*/
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struct __packed virtio_net_ctrl_hdr {
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__u8 class;
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__u8 cmd;
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};
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typedef __u8 virtio_net_ctrl_ack;
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#define VIRTIO_NET_OK 0
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#define VIRTIO_NET_ERR 1
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/*
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* Control the RX mode, ie. promisucous, allmulti, etc...
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*
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* All commands require an "out" sg entry containing a 1 byte state value,
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* zero = disable, non-zero = enable.
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*
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* Commands 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
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* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
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*/
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#define VIRTIO_NET_CTRL_RX 0
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#define VIRTIO_NET_CTRL_RX_PROMISC 0
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#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
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#define VIRTIO_NET_CTRL_RX_ALLUNI 2
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#define VIRTIO_NET_CTRL_RX_NOMULTI 3
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#define VIRTIO_NET_CTRL_RX_NOUNI 4
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#define VIRTIO_NET_CTRL_RX_NOBCAST 5
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/*
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* Control the MAC
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*
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* The MAC filter table is managed by the hypervisor, the guest should assume
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* the size is infinite. Filtering should be considered non-perfect, ie. based
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* on hypervisor resources, the guest may received packets from sources not
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* specified in the filter list.
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*
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* In addition to the class/cmd header, the TABLE_SET command requires two
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* out scatterlists. Each contains a 4 byte count of entries followed by a
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* concatenated byte stream of the ETH_ALEN MAC addresses. The first sg list
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* contains unicast addresses, the second is for multicast. This functionality
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* is present if the VIRTIO_NET_F_CTRL_RX feature is available.
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*
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* The ADDR_SET command requests one out scatterlist, it contains a 6 bytes MAC
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* address. This functionality is present if the VIRTIO_NET_F_CTRL_MAC_ADDR
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* feature is available.
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*/
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struct __packed virtio_net_ctrl_mac {
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__virtio32 entries;
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__u8 macs[][ETH_ALEN];
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};
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#define VIRTIO_NET_CTRL_MAC 1
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#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
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#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
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/*
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* Control VLAN filtering
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*
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* The VLAN filter table is controlled via a simple ADD/DEL interface. VLAN IDs
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* not added may be filterd by the hypervisor. Del is the opposite of add. Both
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* commands expect an out entry containing a 2 byte VLAN ID. VLAN filterting is
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* available with the VIRTIO_NET_F_CTRL_VLAN feature bit.
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*/
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#define VIRTIO_NET_CTRL_VLAN 2
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#define VIRTIO_NET_CTRL_VLAN_ADD 0
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#define VIRTIO_NET_CTRL_VLAN_DEL 1
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/*
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* Control link announce acknowledgment
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*
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* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that driver has
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* recevied the notification; device would clear the VIRTIO_NET_S_ANNOUNCE bit
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* in the status field after it receives this command.
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*/
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#define VIRTIO_NET_CTRL_ANNOUNCE 3
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#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
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/*
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* Control receive flow steering
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*
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* The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET enables receive flow steering,
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* specifying the number of the transmit and receive queues that will be used.
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* After the command is consumed and acked by the device, the device will not
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* steer new packets on receive virtqueues other than specified nor read from
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* transmit virtqueues other than specified. Accordingly, driver should not
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* transmit new packets on virtqueues other than specified.
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*/
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struct virtio_net_ctrl_mq {
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__virtio16 virtqueue_pairs;
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};
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#define VIRTIO_NET_CTRL_MQ 4
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
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#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
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/*
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* Control network offloads
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*
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* Reconfigures the network offloads that guest can handle.
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*
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* Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
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*
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* Command data format matches the feature bit mask exactly.
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*
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* See VIRTIO_NET_F_GUEST_* for the list of offloads
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* that can be enabled/disabled.
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*/
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#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
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#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
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#endif /* _LINUX_VIRTIO_NET_H */
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