CTDB Project ibwrapper: Difference between revisions
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* This callback is invoked from within ibw_process_event. |
* This callback is invoked from within ibw_process_event. |
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* Return nonzero on error. |
* Return nonzero on error. |
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* |
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* Important: you mustn't store buf pointer for later use. Process its contents before returning. |
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*/ |
*/ |
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typedef int (*ibw_receive_fn_t)(ibw_conn *conn, void *buf, int n); |
typedef int (*ibw_receive_fn_t)(ibw_conn *conn, void *buf, int n); |
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*/ |
*/ |
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int ibw_process_statechange(ibw_ctx *ctx); |
int ibw_process_statechange(ibw_ctx *ctx); |
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/* |
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* You have to use this buf to fill in before send. |
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* It's just to avoid memcpy.in ibw_send. |
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* |
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* Returns 0 on success. |
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*/ |
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int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key, int n); |
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/* |
/* |
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* Can be invoked any times (should fit into buffers) and at any time |
* Can be invoked any times (should fit into buffers) and at any time |
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* (in conn->state=IBWC_CONNECTED) |
* (in conn->state=IBWC_CONNECTED) |
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* |
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* You mustn't use (buf, key) any more for sending. |
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*/ |
*/ |
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int ibw_send(ibw_conn *conn, void *buf, int n); |
int ibw_send(ibw_conn *conn, void *buf, void *key, int n); |
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/* |
/* |
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* Retrieves the last error |
* Retrieves the last error |
Revision as of 12:37, 28 November 2006
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 */ /* Server communication state */ typedef enum { IBWS_INIT = 0, /* ctx start - after ibw_init */ IBWS_ADDR_RESOLVED, /* after bind - should proceed to IBWS_READY processing the next fd_cm event - internally */ IBWS_READY, /* after bind 2.; call ibw_listen on this - once */ IBWS_CONNECT_REQUEST, /* after [IBWS_READY + incoming request] */ /* => [(ibw_accept)IBWS_READY | (ibw_disconnect)STOPPED | ERROR] */ IBWS_STOPPED, /* normal stop <= ibw_disconnect+(IBWS_READY | IBWS_CONNECT_REQUEST) */ IBWS_ERROR /* abnormal state; ibw_stop must be called after this */ } ibw_state_ctx; /* Connection state */ typedef struct _ibw_ctx { int fd_events; /* read fd of verbs events */ /* ibw_process_event must be _always_ invoked */ /* when this fd is set after a select/poll */ int fd_cm; /* read fd about a cm state change */ /* call ibw_process_statechange after it's set */ void *ctx_userdata; /* see ibw_init */ ibw_state_ctx state; void *internal; } ibw_ctx; typedef enum { IBWC_INIT = 0, /* conn start - internal state */ IBWC_CONNECTED, /* after ibw_accept or ibw_connect */ IBWC_DISCONNECTED, /* after ibw_disconnect */ IBWC_ERROR } ibw_state_conn; typedef struct _ibw_conn { ibw_ctx *ctx; ibw_state_conn state; void *conn_userdata; /* see ibw_connect and ibw_accept */ void *internal; } ibw_conn; typedef struct _ibw_initattr { const char *name; const char *value; } ibw_initattr; /* * Callback function definition which should inform you about * connection state change * This callback is invoked from within ibw_process_statechange. * Both <conn> and <ctx> can be NULL if their state didn't change. * Return nonzero on error. */ typedef int (*ibw_connstate_fn_t)(ibw_ctx *ctx, ibw_conn *conn, void *ctx_userdata); /* * Callback function definition which should process incoming packets * This callback is invoked from within ibw_process_event. * Return nonzero on error. * * Important: you mustn't store buf pointer for later use. Process its contents before returning. */ typedef int (*ibw_receive_fn_t)(ibw_conn *conn, void *buf, int n); /* * 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 _ONCE_ for each node. * * returns non-NULL on success * * talloc_free must be called for the result in IBWS_STOPPED; * it will close resources by destructor * connections(ibw_conn *) must have been closed prior talloc_free */ ibw_ctx *ibw_init(ibw_initattr *attr, int nattr, ibw_connstate_fn_t ibw_connstate, void *ctx_userdata, ibw_receive_fn_t ibw_receive); /* * Must be called in states of (IBWS_ERROR, IBWS_READY, IBWS_CONNECT_REQUEST) * * It will send out disconnect requests and free up ibw_conn structures. * The ctx->state will transit to IBWS_STOPPED after every conn are disconnected. * During that time, you mustn't send/recv/disconnect any more. * Only after ctx->state=IBWS_STOPPED you can talloc_free the ctx. */ int ibw_stop(ibw_ctx *ctx); /*************** connection initiation - like stream sockets *****/ /* * works like socket bind * needs a normal internet address here * * return 0 on success */ int ibw_bind(ibw_ctx *ctx, struct sockaddr_in *my_addr); /* * works like socket listen * non-blocking * enables accepting incoming connections (after IBWS_READY) * (it doesn't touch ctx->state by itself) * * returns ctx->cm_fd */ int ibw_listen(ibw_ctx *ctx, int backlog); /* * works like socket accept * initializes a connection to a client * must be called when state=IBWS_CONNECT_REQUEST * * returns 0 on success * * You have +1 waiting here: you will get ibw_conn (having the * same <conn_userdata> member) structure in ibw_connstate_fn_t. * * Important: you won't get remote IP address (only internal conn info) */ int ibw_accept(ibw_ctx *ctx, void *conn_userdata); /* * Needs a normal internet address here * can be called within IBWS_READY|IBWS_CONNECT_REQUEST * * returns non-NULL on success * * You have +1 waiting here: you will get ibw_conn (having the * same <conn_userdata> member) structure in ibw_connstate_fn_t. */ int ibw_connect(ibw_ctx *ctx, struct sockaddr_in *serv_addr, void *conn_userdata); /* * Sends out a disconnect request. * You should process ctx->cm_fd ater calling this function * and then process it with ibw_process_event normally * (until you get conn->state = IBWC_DISCONNECTED) * * You mustn't talloc_free <conn> after this. */ void ibw_disconnect(ibw_conn *conn); /************ Infiniband specific event loop wrapping ******************/ /* * Must be called in all cases after selecting/polling for ctx->fd_events is set. */ int ibw_process_event(ibw_ctx *ctx); /* * Must be called in all cases after selecting/polling for ctx->fd_cm is set. */ int ibw_process_statechange(ibw_ctx *ctx); /* * You have to use this buf to fill in before send. * It's just to avoid memcpy.in ibw_send. * * Returns 0 on success. */ int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key, int n); /* * Send the message in one * Can be invoked any times (should fit into buffers) and at any time * (in conn->state=IBWC_CONNECTED) * * You mustn't use (buf, key) any more for sending. */ int ibw_send(ibw_conn *conn, void *buf, void *key, int n); /* * Retrieves the last error * result: always non-zero, mustn't be freed (static) */ const char *ibw_getLastError();