mirror of https://gitee.com/openkylin/qemu.git
213 lines
6.7 KiB
C
213 lines
6.7 KiB
C
/*
|
|
* Copyright 6WIND S.A., 2014
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
* (at your option) any later version. See the COPYING file in the
|
|
* top-level directory.
|
|
*/
|
|
|
|
#ifndef IVSHMEM_CLIENT_H
|
|
#define IVSHMEM_CLIENT_H
|
|
|
|
/**
|
|
* This file provides helper to implement an ivshmem client. It is used
|
|
* on the host to ask QEMU to send an interrupt to an ivshmem PCI device in a
|
|
* guest. QEMU also implements an ivshmem client similar to this one, they both
|
|
* connect to an ivshmem server.
|
|
*
|
|
* A standalone ivshmem client based on this file is provided for debug/test
|
|
* purposes.
|
|
*/
|
|
|
|
#include <sys/select.h>
|
|
|
|
#include "qemu/queue.h"
|
|
#include "hw/misc/ivshmem.h"
|
|
|
|
/**
|
|
* Maximum number of notification vectors supported by the client
|
|
*/
|
|
#define IVSHMEM_CLIENT_MAX_VECTORS 64
|
|
|
|
/**
|
|
* Structure storing a peer
|
|
*
|
|
* Each time a client connects to an ivshmem server, it is advertised to
|
|
* all connected clients through the unix socket. When our ivshmem
|
|
* client receives a notification, it creates a IvshmemClientPeer
|
|
* structure to store the infos of this peer.
|
|
*
|
|
* This structure is also used to store the information of our own
|
|
* client in (IvshmemClient)->local.
|
|
*/
|
|
typedef struct IvshmemClientPeer {
|
|
QTAILQ_ENTRY(IvshmemClientPeer) next; /**< next in list*/
|
|
int64_t id; /**< the id of the peer */
|
|
int vectors[IVSHMEM_CLIENT_MAX_VECTORS]; /**< one fd per vector */
|
|
unsigned vectors_count; /**< number of vectors */
|
|
} IvshmemClientPeer;
|
|
QTAILQ_HEAD(IvshmemClientPeerList, IvshmemClientPeer);
|
|
|
|
typedef struct IvshmemClientPeerList IvshmemClientPeerList;
|
|
typedef struct IvshmemClient IvshmemClient;
|
|
|
|
/**
|
|
* Typedef of callback function used when our IvshmemClient receives a
|
|
* notification from a peer.
|
|
*/
|
|
typedef void (*IvshmemClientNotifCb)(
|
|
const IvshmemClient *client,
|
|
const IvshmemClientPeer *peer,
|
|
unsigned vect, void *arg);
|
|
|
|
/**
|
|
* Structure describing an ivshmem client
|
|
*
|
|
* This structure stores all information related to our client: the name
|
|
* of the server unix socket, the list of peers advertised by the
|
|
* server, our own client information, and a pointer the notification
|
|
* callback function used when we receive a notification from a peer.
|
|
*/
|
|
struct IvshmemClient {
|
|
char unix_sock_path[PATH_MAX]; /**< path to unix sock */
|
|
int sock_fd; /**< unix sock filedesc */
|
|
int shm_fd; /**< shm file descriptor */
|
|
|
|
IvshmemClientPeerList peer_list; /**< list of peers */
|
|
IvshmemClientPeer local; /**< our own infos */
|
|
|
|
IvshmemClientNotifCb notif_cb; /**< notification callback */
|
|
void *notif_arg; /**< notification argument */
|
|
|
|
bool verbose; /**< true to enable debug */
|
|
};
|
|
|
|
/**
|
|
* Initialize an ivshmem client
|
|
*
|
|
* @client: A pointer to an uninitialized IvshmemClient structure
|
|
* @unix_sock_path: The pointer to the unix socket file name
|
|
* @notif_cb: If not NULL, the pointer to the function to be called when
|
|
* our IvshmemClient receives a notification from a peer
|
|
* @notif_arg: Opaque pointer given as-is to the notification callback
|
|
* function
|
|
* @verbose: True to enable debug
|
|
*
|
|
* Returns: 0 on success, or a negative value on error
|
|
*/
|
|
int ivshmem_client_init(IvshmemClient *client, const char *unix_sock_path,
|
|
IvshmemClientNotifCb notif_cb, void *notif_arg,
|
|
bool verbose);
|
|
|
|
/**
|
|
* Connect to the server
|
|
*
|
|
* Connect to the server unix socket, and read the first initial
|
|
* messages sent by the server, giving the ID of the client and the file
|
|
* descriptor of the shared memory.
|
|
*
|
|
* @client: The ivshmem client
|
|
*
|
|
* Returns: 0 on success, or a negative value on error
|
|
*/
|
|
int ivshmem_client_connect(IvshmemClient *client);
|
|
|
|
/**
|
|
* Close connection to the server and free all peer structures
|
|
*
|
|
* @client: The ivshmem client
|
|
*/
|
|
void ivshmem_client_close(IvshmemClient *client);
|
|
|
|
/**
|
|
* Fill a fd_set with file descriptors to be monitored
|
|
*
|
|
* This function will fill a fd_set with all file descriptors
|
|
* that must be polled (unix server socket and peers eventfd). The
|
|
* function will not initialize the fd_set, it is up to the caller
|
|
* to do this.
|
|
*
|
|
* @client: The ivshmem client
|
|
* @fds: The fd_set to be updated
|
|
* @maxfd: Must be set to the max file descriptor + 1 in fd_set. This value is
|
|
* updated if this function adds a greater fd in fd_set.
|
|
*/
|
|
void ivshmem_client_get_fds(const IvshmemClient *client, fd_set *fds,
|
|
int *maxfd);
|
|
|
|
/**
|
|
* Read and handle new messages
|
|
*
|
|
* Given a fd_set filled by select(), handle incoming messages from
|
|
* server or peers.
|
|
*
|
|
* @client: The ivshmem client
|
|
* @fds: The fd_set containing the file descriptors to be checked. Note
|
|
* that file descriptors that are not related to our client are
|
|
* ignored.
|
|
* @maxfd: The maximum fd in fd_set, plus one.
|
|
*
|
|
* Returns: 0 on success, or a negative value on error
|
|
*/
|
|
int ivshmem_client_handle_fds(IvshmemClient *client, fd_set *fds, int maxfd);
|
|
|
|
/**
|
|
* Send a notification to a vector of a peer
|
|
*
|
|
* @client: The ivshmem client
|
|
* @peer: The peer to be notified
|
|
* @vector: The number of the vector
|
|
*
|
|
* Returns: 0 on success, or a negative value on error
|
|
*/
|
|
int ivshmem_client_notify(const IvshmemClient *client,
|
|
const IvshmemClientPeer *peer, unsigned vector);
|
|
|
|
/**
|
|
* Send a notification to all vectors of a peer
|
|
*
|
|
* @client: The ivshmem client
|
|
* @peer: The peer to be notified
|
|
*
|
|
* Returns: 0 on success, or a negative value on error (at least one
|
|
* notification failed)
|
|
*/
|
|
int ivshmem_client_notify_all_vects(const IvshmemClient *client,
|
|
const IvshmemClientPeer *peer);
|
|
|
|
/**
|
|
* Broadcat a notification to all vectors of all peers
|
|
*
|
|
* @client: The ivshmem client
|
|
*
|
|
* Returns: 0 on success, or a negative value on error (at least one
|
|
* notification failed)
|
|
*/
|
|
int ivshmem_client_notify_broadcast(const IvshmemClient *client);
|
|
|
|
/**
|
|
* Search a peer from its identifier
|
|
*
|
|
* Return the peer structure from its peer_id. If the given peer_id is
|
|
* the local id, the function returns the local peer structure.
|
|
*
|
|
* @client: The ivshmem client
|
|
* @peer_id: The identifier of the peer structure
|
|
*
|
|
* Returns: The peer structure, or NULL if not found
|
|
*/
|
|
IvshmemClientPeer *
|
|
ivshmem_client_search_peer(IvshmemClient *client, int64_t peer_id);
|
|
|
|
/**
|
|
* Dump information of this ivshmem client on stdout
|
|
*
|
|
* Dump the id and the vectors of the given ivshmem client and the list
|
|
* of its peers and their vectors on stdout.
|
|
*
|
|
* @client: The ivshmem client
|
|
*/
|
|
void ivshmem_client_dump(const IvshmemClient *client);
|
|
|
|
#endif /* IVSHMEM_CLIENT_H */
|