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204 lines
8.4 KiB
204 lines
8.4 KiB
#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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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of IBM nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. */ |
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#include <linux/types.h> |
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#include <linux/virtio_ids.h> |
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#include <linux/virtio_config.h> |
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#include <linux/if_ether.h> |
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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_F_CTRL_RX 18 /* Control channel RX mode support */ |
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#define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */ |
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#define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */ |
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#define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the |
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* network */ |
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#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow |
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* Steering */ |
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#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ |
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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 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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/* 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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} __attribute__((packed)); |
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/* This header comes first in the scatter-gather list. |
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* 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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struct virtio_net_hdr { |
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset |
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#define VIRTIO_NET_HDR_F_DATA_VALID 2 // Csum is valid |
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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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/* |
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* Control the RX mode, ie. promisucous, allmulti, etc... |
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* All commands require an "out" sg entry containing a 1 byte |
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* state value, zero = disable, non-zero = enable. Commands |
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* 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 |
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* assume the size is infinite. Filtering should be considered |
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* non-perfect, ie. based on hypervisor resources, the guest may |
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* received packets from sources not 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 |
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* two out scatterlists. Each contains a 4 byte count of entries followed |
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* by a concatenated byte stream of the ETH_ALEN MAC addresses. The |
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* first sg list contains unicast addresses, the second is for multicast. |
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* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature |
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* is available. |
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* |
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* The ADDR_SET command requests one out scatterlist, it contains a |
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* 6 bytes MAC address. This functionality is present if the |
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* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. |
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*/ |
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struct virtio_net_ctrl_mac { |
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__u32 entries; |
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__u8 macs[][ETH_ALEN]; |
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} __attribute__((packed)); |
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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. |
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* VLAN IDs not added may be filterd by the hypervisor. Del is the |
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* opposite of add. Both commands expect an out entry containing a 2 |
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* byte VLAN ID. VLAN filterting is available with the |
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* 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 acknowledgement |
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* |
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* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that |
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* driver has recevied the notification; device would clear the |
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* VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives |
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* 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 |
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* enables Receive Flow Steering, specifying the number of the transmit and |
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* receive queues that will be used. After the command is consumed and acked by |
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* the device, the device will not steer new packets on receive virtqueues |
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* other than specified nor read from transmit virtqueues other than specified. |
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* Accordingly, driver should not transmit new packets on virtqueues other than |
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* specified. |
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*/ |
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struct virtio_net_ctrl_mq { |
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__u16 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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#endif /* _LINUX_VIRTIO_NET_H */
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