2cd097ba8c
Implement the communication channel for the device to notify us of some events, and notably implement the handling of the config updates needed for the combination of this feature and VHOST_USER_PROTOCOL_F_CONFIG. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Vhost-user protocol */
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#ifndef __VHOST_USER_H__
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#define __VHOST_USER_H__
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/* Message flags */
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#define VHOST_USER_FLAG_REPLY BIT(2)
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/* Feature bits */
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#define VHOST_USER_F_PROTOCOL_FEATURES 30
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/* Protocol feature bits */
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#define VHOST_USER_PROTOCOL_F_SLAVE_REQ 5
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#define VHOST_USER_PROTOCOL_F_CONFIG 9
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/* Vring state index masks */
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#define VHOST_USER_VRING_INDEX_MASK 0xff
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#define VHOST_USER_VRING_POLL_MASK BIT(8)
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/* Supported version */
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#define VHOST_USER_VERSION 1
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/* Supported transport features */
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#define VHOST_USER_SUPPORTED_F BIT_ULL(VHOST_USER_F_PROTOCOL_FEATURES)
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/* Supported protocol features */
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#define VHOST_USER_SUPPORTED_PROTOCOL_F (BIT_ULL(VHOST_USER_PROTOCOL_F_SLAVE_REQ) | \
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BIT_ULL(VHOST_USER_PROTOCOL_F_CONFIG))
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enum vhost_user_request {
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VHOST_USER_GET_FEATURES = 1,
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VHOST_USER_SET_FEATURES = 2,
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VHOST_USER_SET_OWNER = 3,
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VHOST_USER_RESET_OWNER = 4,
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VHOST_USER_SET_MEM_TABLE = 5,
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VHOST_USER_SET_LOG_BASE = 6,
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VHOST_USER_SET_LOG_FD = 7,
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VHOST_USER_SET_VRING_NUM = 8,
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VHOST_USER_SET_VRING_ADDR = 9,
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VHOST_USER_SET_VRING_BASE = 10,
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VHOST_USER_GET_VRING_BASE = 11,
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VHOST_USER_SET_VRING_KICK = 12,
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VHOST_USER_SET_VRING_CALL = 13,
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VHOST_USER_SET_VRING_ERR = 14,
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VHOST_USER_GET_PROTOCOL_FEATURES = 15,
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VHOST_USER_SET_PROTOCOL_FEATURES = 16,
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VHOST_USER_GET_QUEUE_NUM = 17,
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VHOST_USER_SET_VRING_ENABLE = 18,
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VHOST_USER_SEND_RARP = 19,
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VHOST_USER_NET_SEND_MTU = 20,
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VHOST_USER_SET_SLAVE_REQ_FD = 21,
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VHOST_USER_IOTLB_MSG = 22,
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VHOST_USER_SET_VRING_ENDIAN = 23,
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VHOST_USER_GET_CONFIG = 24,
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VHOST_USER_SET_CONFIG = 25,
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};
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enum vhost_user_slave_request {
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VHOST_USER_SLAVE_IOTLB_MSG = 1,
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VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2,
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VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3,
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};
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struct vhost_user_header {
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/*
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* Use enum vhost_user_request for outgoing messages,
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* uses enum vhost_user_slave_request for incoming ones.
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*/
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u32 request;
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u32 flags;
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u32 size;
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} __packed;
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struct vhost_user_config {
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u32 offset;
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u32 size;
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u32 flags;
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u8 payload[0]; /* Variable length */
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} __packed;
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struct vhost_user_vring_state {
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u32 index;
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u32 num;
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} __packed;
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struct vhost_user_vring_addr {
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u32 index;
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u32 flags;
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u64 desc, used, avail, log;
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} __packed;
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struct vhost_user_mem_region {
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u64 guest_addr;
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u64 size;
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u64 user_addr;
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u64 mmap_offset;
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} __packed;
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struct vhost_user_mem_regions {
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u32 num;
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u32 padding;
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struct vhost_user_mem_region regions[2]; /* Currently supporting 2 */
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} __packed;
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union vhost_user_payload {
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u64 integer;
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struct vhost_user_config config;
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struct vhost_user_vring_state vring_state;
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struct vhost_user_vring_addr vring_addr;
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struct vhost_user_mem_regions mem_regions;
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};
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struct vhost_user_msg {
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struct vhost_user_header header;
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union vhost_user_payload payload;
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} __packed;
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#endif
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