CTDB Project ibwrapper

File ibwrapper.h:

/*
 * Infiniband Verbs API socket-like wrapper
 * Copyright (C) Peter Somogyi 2006
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * Basically, traditional socket is chosen for exchanging
 * infiniband/verbs-specific info when connecting a client.
 *
 * The socket-like functions call the real socket functions, with some
 * ib wrapping and error and state checking. Must be used "normally" ...
 *
 * However, ibw_write and ibw_read use real infiniband/verbs calls only.
 */

typedef struct _ibw_ctx {
        int fd; /* read fd of verbs event, ibw_can_read must be invoked after that */
		/* ibw_process_event must be _always_ invoked */
		/* when this fd is set after a select/poll */
        void *internal;
} ibw_ctx;

typedef struct _ibw_conn {
        ibw_ctx *ctx;
	void *userdata; /* see also ibw_connect and ibw_accept */
        void *internal;
} ibw_conn;

/*
 * Retrieves the last error
 * result: always non-zero, mustn't be freed (static)
 */
const char *ibw_getLastError();


typedef struct _ibw_initattr {
	const char *name;
	const char *value;
} ibw_initattr;

/*
 * Callback function definition which should process incoming packets
 * It's called from within ibw_process_event.
 */
typedef int (*ibw_receive_fn_t)(ibw_conn *conn, void *buf, int nsize);

/*
 * settings: array of (name, value) pairs
 * where name is one of:
 *      dev_name [default is the first one]
 *      rx_depth [default is 500]
 *      mtu     [default is 1024]
 *      ib_port [default is 1]
 *
 * Must be called for each NODE _ONCE_
 *
 * returns non-NULL on success
 * talloc_free must be called for the result
 */
ibw_ctx *ibw_init(ibw_initattr *attr, int nattr, ibw_receive_fn_t ibw_receive);


/*************** connection initiation - like stream sockets *****/
/* TODO: enum nodes + verify this connection method */

/*
 * Call as the normal one (see man page)
 * returns a sockfd as the normal one
 */
int ibw_socket(ibw_ctx *ctx, int domain, int type, int protocol);

/*
 * Needs a normal internet address here
 * return is a real socket fd
 */
int ibw_bind(ibw_ctx *ctx, struct sockaddr_in *my_addr);

/*
 * sockfd here is a real sockfd
 * see also the man page
 * !!!: it's also blocking
 */
int ibw_listen(ibw_ctx *ctx, int sockfd, int backlog);

/*
 * sockfd here is a real sockfd
 * see also the man page
 * !!!:
 * additionally, the server exchanges ib-specific
 * properties (lid, qpn, psn) here with the client
 * + initializes a connection
 *
 * returns non-NULL on success
 * talloc_free must be called for the result (which calls close)
 *
 * userdata: will be put into ibw_conn (see also ibw_callback_fn_t)
 */
ibw_conn *ibw_accept(ibw_ctx *ctx, int sockfd, struct sockaddr_in *cli_addr, void *userdata);

/*
 * Needs a normal internet address here
 *
 * returns non-NULL on success
 * talloc_free must be called for the result (which calls close)
 *
 * userdata: will be put into ibw_conn (see also ibw_callback_fn_t)
 */
ibw_conn *ibw_connect(ibw_ctx *ctx, int sockfd, struct sockaddr_in *serv_addr, void *userdata);


/************ Infiniband specific event loop wrapping ******************/

/* 
 * !!! Must be called in all cases after selecting/polling for ctx->fd is set.
 */
int ibw_process_event(ibw_ctx *ctx);


/*
 * Send the message in one
 * Can be invoked any times (should fit into buffers) and at any time
 */
int ibw_send(ibw_conn *connctx, void *buf, int n);