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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* VMware vSockets Driver
*
* Copyright (C) 2013 VMware, Inc. All rights reserved.
*/
#ifndef _VMCI_TRANSPORT_H_
#define _VMCI_TRANSPORT_H_
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.h>
#include <net/vsock_addr.h>
#include <net/af_vsock.h>
/* If the packet format changes in a release then this should change too. */
#define VMCI_TRANSPORT_PACKET_VERSION 1
/* The resource ID on which control packets are sent. */
#define VMCI_TRANSPORT_PACKET_RID 1
/* The resource ID on which control packets are sent to the hypervisor. */
#define VMCI_TRANSPORT_HYPERVISOR_PACKET_RID 15
#define VSOCK_PROTO_INVALID 0
#define VSOCK_PROTO_PKT_ON_NOTIFY (1 << 0)
#define VSOCK_PROTO_ALL_SUPPORTED (VSOCK_PROTO_PKT_ON_NOTIFY)
#define vmci_trans(_vsk) ((struct vmci_transport *)((_vsk)->trans))
enum vmci_transport_packet_type {
VMCI_TRANSPORT_PACKET_TYPE_INVALID = 0,
VMCI_TRANSPORT_PACKET_TYPE_REQUEST,
VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE,
VMCI_TRANSPORT_PACKET_TYPE_OFFER,
VMCI_TRANSPORT_PACKET_TYPE_ATTACH,
VMCI_TRANSPORT_PACKET_TYPE_WROTE,
VMCI_TRANSPORT_PACKET_TYPE_READ,
VMCI_TRANSPORT_PACKET_TYPE_RST,
VMCI_TRANSPORT_PACKET_TYPE_SHUTDOWN,
VMCI_TRANSPORT_PACKET_TYPE_WAITING_WRITE,
VMCI_TRANSPORT_PACKET_TYPE_WAITING_READ,
VMCI_TRANSPORT_PACKET_TYPE_REQUEST2,
VMCI_TRANSPORT_PACKET_TYPE_NEGOTIATE2,
VMCI_TRANSPORT_PACKET_TYPE_MAX
};
struct vmci_transport_waiting_info {
u64 generation;
u64 offset;
};
/* Control packet type for STREAM sockets. DGRAMs have no control packets nor
* special packet header for data packets, they are just raw VMCI DGRAM
* messages. For STREAMs, control packets are sent over the control channel
* while data is written and read directly from queue pairs with no packet
* format.
*/
struct vmci_transport_packet {
struct vmci_datagram dg;
u8 version;
u8 type;
u16 proto;
u32 src_port;
u32 dst_port;
u32 _reserved2;
union {
u64 size;
u64 mode;
struct vmci_handle handle;
struct vmci_transport_waiting_info wait;
} u;
};
struct vmci_transport_notify_pkt {
u64 write_notify_window;
u64 write_notify_min_window;
bool peer_waiting_read;
bool peer_waiting_write;
bool peer_waiting_write_detected;
bool sent_waiting_read;
bool sent_waiting_write;
struct vmci_transport_waiting_info peer_waiting_read_info;
struct vmci_transport_waiting_info peer_waiting_write_info;
u64 produce_q_generation;
u64 consume_q_generation;
};
struct vmci_transport_notify_pkt_q_state {
u64 write_notify_window;
u64 write_notify_min_window;
bool peer_waiting_write;
bool peer_waiting_write_detected;
};
union vmci_transport_notify {
struct vmci_transport_notify_pkt pkt;
struct vmci_transport_notify_pkt_q_state pkt_q_state;
};
/* Our transport-specific data. */
struct vmci_transport {
/* For DGRAMs. */
struct vmci_handle dg_handle;
/* For STREAMs. */
struct vmci_handle qp_handle;
struct vmci_qp *qpair;
u64 produce_size;
u64 consume_size;
u32 detach_sub_id;
union vmci_transport_notify notify;
const struct vmci_transport_notify_ops *notify_ops;
struct list_head elem;
struct sock *sk;
spinlock_t lock; /* protects sk. */
};
int vmci_transport_register(void);
void vmci_transport_unregister(void);
int vmci_transport_send_wrote_bh(struct sockaddr_vm *dst,
struct sockaddr_vm *src);
int vmci_transport_send_read_bh(struct sockaddr_vm *dst,
struct sockaddr_vm *src);
int vmci_transport_send_wrote(struct sock *sk);
int vmci_transport_send_read(struct sock *sk);
int vmci_transport_send_waiting_write(struct sock *sk,
struct vmci_transport_waiting_info *wait);
int vmci_transport_send_waiting_read(struct sock *sk,
struct vmci_transport_waiting_info *wait);
#endif
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