fi_listen¶

The fi_listen call indicates that the specified endpoint should be transitioned into a passive connection state, allowing it to accept incoming connection requests. Connection requests against a listening endpoint are reported asynchronously to the user through a bound CM event queue using the FI_CONNREQ event type. The number of outstanding connection requests that can be queued at an endpoint is limited by the listening endpoint’s backlog parameter. The backlog is initialized based on administrative configuration values, but may be adjusted through the fi_control call.

fi_connect¶

The fi_connect call initiates a connection request on a connection-oriented endpoint to the destination address. fi_connect may only be called on an endpoint once in its lifetime.

fi_accept / fi_reject¶

The fi_accept and fi_reject calls are used on the passive (listening) side of a connection to accept or reject a connection request, respectively. To accept a connection, the listening application first waits for a connection request event (FI_CONNREQ). After receiving such an event, the application allocates a new endpoint to accept the connection. This endpoint must be allocated using an fi_info structure referencing the handle from this FI_CONNREQ event. fi_accept is then invoked with the newly allocated endpoint. If the listening application wishes to reject a connection request, it calls fi_reject with the listening endpoint and a reference to the connection request.

A successfully accepted connection request will result in the active (connecting) endpoint seeing an FI_CONNECTED event on its associated event queue. A rejected or failed connection request will generate an error event. The error entry will provide additional details describing the reason for the failed attempt.

An FI_CONNECTED event will also be generated on the passive side for the accepting endpoint once the connection has been properly established. The fid of the FI_CONNECTED event will be that of the endpoint passed to fi_accept as opposed to the listening passive endpoint. Outbound data transfers cannot be initiated on a connection-oriented endpoint until an FI_CONNECTED event has been generated. However, receive buffers may be associated with an endpoint anytime.

fi_shutdown¶

The fi_shutdown call is used to gracefully disconnect an endpoint from its peer. The flags parameter is reserved and must be 0.

Outstanding operations posted to the endpoint when fi_shutdown is called will be canceled or discarded. Notification of canceled operations will be reported by the provider to the corresponding completion queue(s). Discarded operations will silently be dropped, with no completions generated. The choice of canceling, versus discarding operations, is provider dependent. However, all canceled completions will be written before fi_shutdown returns.

When called, fi_shutdown does not affect completions already written to a completion queue. Any queued completions associated with asynchronous operations posted to the endpoint may still be retrieved from the corresponding completion queue(s) after an endpoint has been shutdown.

An FI_SHUTDOWN event will be generated for an endpoint when the remote peer issues a disconnect using fi_shutdown or abruptly closes the endpoint. Note that in the abrupt close case, an FI_SHUTDOWN event will only be generated if the peer system is reachable and a service or kernel agent on the peer system is able to notify the local endpoint that the connection has been aborted.

fi_close¶

Fi_close is used to disassociate an endpoint from a multicast group and close all resources associated with the group. Fi_close must be called on all multicast groups that an endpoint joins.

fi_setname¶

The fi_setname call may be used to modify or assign the address of the local endpoint. It is conceptually similar to the socket bind operation. An endpoint may be assigned an address on its creation, through the fi_info structure. The fi_setname call allows an endpoint to be created without being associated with a specific service (e.g., port number) and/or node (e.g., network) address, with the addressing assigned dynamically. The format of the specified addressing data must match that specified through the fi_info structure when the endpoint was created.

If no service address is specified and a service address has not yet been assigned to the endpoint, then the provider will allocate a service address and assign it to the endpoint. If a node or service address is specified, then, upon successful completion of fi_setname, the endpoint will be assigned the given addressing. If an address cannot be assigned, or the endpoint address cannot be modified, an appropriate fabric error number is returned.

fi_getname / fi_getpeer¶

The fi_getname and fi_getpeer calls may be used to retrieve the local or peer endpoint address, respectively. On input, the addrlen parameter should indicate the size of the addr buffer. If the actual address is larger than what can fit into the buffer, it will be truncated and -FI_ETOOSMALL will be returned. On output, addrlen is set to the size of the buffer needed to store the address, which may be larger than the input value.

fi_getname is not guaranteed to return a valid source address until after the specified endpoint has been enabled or has had an address assigned. An endpoint may be enabled explicitly through fi_enable, or implicitly, such as through fi_connect or fi_listen. An address may be assigned using fi_setname. fi_getpeer is not guaranteed to return a valid peer address until an endpoint has been completely connected – an FI_CONNECTED event has been generated.

fi_join¶

This call attaches an endpoint to a multicast group. By default, the endpoint will join the group based on the data transfer capabilities of the endpoint. For example, if the endpoint has been configured to both send and receive data, then the endpoint will be able to initiate and receive transfers to and from the multicast group. The fi_join flags may be used to restrict access to the multicast group, subject to endpoint capability limitations.

Multicast join operations complete asynchronously. An endpoint must be bound to an event queue prior to calling fi_join. The result of the join operation will be reported to the EQ as an FI_JOIN_COMPLETE event. Applications cannot issue multicast transfers until receiving notification that the join operation has completed. Note that an endpoint may begin receiving messages from the multicast group as soon as the join completes, which can occur prior to the FI_JOIN_COMPLETE event being generated.

Applications must call fi_close on the multicast group to disconnect the endpoint from the group. After a join operation has completed, the fi_mc_addr call may be used to retrieve the address associated with the multicast group.

fi_mc_addr¶

Returns the fi_addr_t address associated with a multicast group. This address must be used when transmitting data to a multicast group and paired with the FI_MULTICAST operation flag.