CTDB Project ibwrapper

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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 functions, with some
* ib wrapping and error and state checking. Must be used "normally" ...
*/

typedef struct _ibw_ctx { void *internal; } ibw_ctx;

typedef struct _ibw_conn { int *pfd; /* !!! <-- use this fd to wait for an event + ibw_can_read after then */ /* I'm not sure how often this can change... */ ibw_ctx *ctx; void *internal; } ibw_conn;

/*

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

const char *ibw_getLastError();

/*

* settings: tabbed text of <name>\t<value>\n
* 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 set at client & server
*
* returns non-NULL on success
*/

ibw_ctx *ibw_init(const char *settings);

void ibw_done(ibw_ctx *ctx);

/*

* 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
*/

ibw_conn *ibw_accept(ibw_ctx *ctx, int sockfd, struct sockaddr_in *cli_addr);

/*

* Needs a normal internet address here
*/

ibw_conn *ibw_connect(ibw_ctx *ctx, int sockfd, struct sockaddr_in *serv_addr);

/*

* !!! Must be called after waiting for ibw_conn->fd
* to see whether we really got the correct event for reading
* mustn't call ibw_read if we mustn't read.
*/

int ibw_can_read(ibw_conn *connctx);

/*

* Some prefetching will be performed here (to get the msg in one...)
*/

int ibw_read(ibw_conn *connctx, void *buf, int n);

/*

* I'm not sure here what happens if the CQ is full... TODO: check
* Also try to send the message in _one_
*/

int ibw_write(ibw_conn *connctx, void *buf, int n);

void ibw_close(ibw_conn *connctx);