2a41f71d3b
This will be used for RX mode, MAC filter table, VLAN filtering, etc... The control transaction consists of one or more "out" sg entries and one or more "in" sg entries. The first out entry contains a header defining the class and command. Additional out entries may provide data for the command. The last in entry provides a status response back from the command. Virtqueues typically run asynchronous, running a callback function when there's data in the channel. We can't readily make use of this in the command paths where we need to use this. Instead, we kick the virtqueue and spin. The kick causes an I/O write, triggering an immediate trap into the hypervisor. Signed-off-by: Alex Williamson <alex.williamson@hp.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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/* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers. */
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#include <linux/types.h>
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#include <linux/virtio_config.h>
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/* The ID for virtio_net */
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#define VIRTIO_ID_NET 1
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/* The feature bitmap for virtio net */
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#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
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#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
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#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
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#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
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#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
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#define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
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#define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
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#define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
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#define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
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#define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
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#define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
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#define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
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#define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
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#define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
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#define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
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#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
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struct virtio_net_config
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{
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/* The config defining mac address (if VIRTIO_NET_F_MAC) */
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__u8 mac[6];
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/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
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__u16 status;
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} __attribute__((packed));
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/* This is 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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struct virtio_net_hdr
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{
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
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__u8 flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
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#define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
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#define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
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#define VIRTIO_NET_HDR_GSO_TCPV6 4 // 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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__u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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__u16 gso_size; /* Bytes to append to hdr_len per frame */
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__u16 csum_start; /* Position to start checksumming from */
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__u16 csum_offset; /* Offset after that to place checksum */
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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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struct virtio_net_hdr_mrg_rxbuf {
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struct virtio_net_hdr hdr;
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__u16 num_buffers; /* Number of merged rx buffers */
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};
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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 virtio_net_ctrl_hdr {
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__u8 class;
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__u8 cmd;
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} __attribute__((packed));
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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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#endif /* _LINUX_VIRTIO_NET_H */
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