/**
* Allocate I/O buffer
*
* @v intf Data transfer interface
* @v len I/O buffer payload length
* @ret iobuf I/O buffer
*/
struct io_buffer * xfer_alloc_iob ( struct interface *intf, size_t len ) {
struct interface *dest;
xfer_alloc_iob_TYPE ( void * ) *op =
intf_get_dest_op ( intf, xfer_alloc_iob, &dest );
void *object = intf_object ( dest );
struct io_buffer *iobuf;
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " alloc_iob %zd\n",
INTF_INTF_DBG ( intf, dest ), len );
if ( op ) {
iobuf = op ( object, len );
} else {
/* Default is to allocate an I/O buffer with no
* reserved space.
*/
iobuf = alloc_iob ( len );
}
if ( ! iobuf ) {
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " alloc_iob "
"failed\n", INTF_INTF_DBG ( intf, dest ) );
}
intf_put ( dest );
return iobuf;
}
/**
* Deliver datagram
*
* @v intf Data transfer interface
* @v iobuf Datagram I/O buffer
* @v meta Data transfer metadata
* @ret rc Return status code
*/
int xfer_deliver ( struct interface *intf,
struct io_buffer *iobuf,
struct xfer_metadata *meta ) {
struct interface *dest;
xfer_deliver_TYPE ( void * ) *op =
intf_get_dest_op ( intf, xfer_deliver, &dest );
void *object = intf_object ( dest );
int rc;
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " deliver %zd\n",
INTF_INTF_DBG ( intf, dest ), iob_len ( iobuf ) );
if ( op ) {
rc = op ( object, iobuf, meta );
} else {
/* Default is to discard the I/O buffer */
free_iob ( iobuf );
rc = -EPIPE;
}
if ( rc != 0 ) {
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT
" deliver failed: %s\n",
INTF_INTF_DBG ( intf, dest ), strerror ( rc ) );
}
intf_put ( dest );
return rc;
}
/**
* Plug an object interface into a new destination object interface
*
* @v intf Object interface
* @v dest New destination object interface
*
* The reference to the existing destination interface is dropped, a
* reference to the new destination interface is obtained, and the
* interface is updated to point to the new destination interface.
*
* Note that there is no "unplug" call; instead you must plug the
* interface into a null interface.
*/
void intf_plug ( struct interface *intf, struct interface *dest ) {
DBGC ( INTF_COL ( intf ),
"INTF " INTF_INTF_FMT " replug to " INTF_FMT "\n",
INTF_INTF_DBG ( intf, intf->dest ), INTF_DBG ( dest ) );
intf_get ( dest );
intf_put ( intf->dest );
intf->dest = dest;
}
/**
* Report change of flow control window
*
* @v intf Data transfer interface
*
* Note that this method is used to indicate only unsolicited changes
* in the flow control window. In particular, this method must not be
* called as part of the response to xfer_deliver(), since that could
* easily lead to an infinite loop. Callers of xfer_deliver() should
* assume that the flow control window will have changed without
* generating an xfer_window_changed() message.
*/
void xfer_window_changed ( struct interface *intf ) {
struct interface *dest;
xfer_window_changed_TYPE ( void * ) *op =
intf_get_dest_op ( intf, xfer_window_changed, &dest );
void *object = intf_object ( dest );
if ( op ) {
op ( object );
} else {
/* Default is to do nothing */
}
intf_put ( dest );
}
/**
* Report SCSI response
*
* @v interface SCSI command interface
* @v response SCSI response
*/
void scsi_response ( struct interface *intf, struct scsi_rsp *response ) {
struct interface *dest;
scsi_response_TYPE ( void * ) *op =
intf_get_dest_op ( intf, scsi_response, &dest );
void *object = intf_object ( dest );
if ( op ) {
op ( object, response );
} else {
/* Default is to ignore the response */
}
intf_put ( dest );
}
/**
* Poke an object interface
*
* @v intf Object interface
* @v type Operation type
*
* This is a helper function to implement methods which take no
* parameters and return nothing.
*/
void intf_poke ( struct interface *intf,
void ( type ) ( struct interface *intf ) ) {
struct interface *dest;
intf_poke_TYPE ( void * ) *op =
intf_get_dest_op_untyped ( intf, type, &dest );
void *object = intf_object ( dest );
if ( op ) {
op ( object );
} else {
/* Default is to do nothing */
}
intf_put ( dest );
}
/**
* Get underlying data transfer buffer
*
* @v interface Data transfer interface
* @ret xferbuf Data transfer buffer, or NULL on error
*
* This call will check that the xfer_buffer() handler belongs to the
* destination interface which also provides xfer_deliver() for this
* interface.
*
* This is done to prevent accidental accesses to a data transfer
* buffer which may be located behind a non-transparent datapath via a
* series of pass-through interfaces.
*/
struct xfer_buffer * xfer_buffer ( struct interface *intf ) {
struct interface *dest;
xfer_buffer_TYPE ( void * ) *op =
intf_get_dest_op ( intf, xfer_buffer, &dest );
void *object = intf_object ( dest );
struct interface *xfer_deliver_dest;
struct xfer_buffer *xferbuf;
/* Check that this operation is provided by the same interface
* which handles xfer_deliver().
*/
( void ) intf_get_dest_op ( intf, xfer_deliver, &xfer_deliver_dest );
if ( op && ( dest == xfer_deliver_dest ) ) {
xferbuf = op ( object );
} else {
/* Default is to not have a data transfer buffer */
xferbuf = NULL;
}
intf_put ( xfer_deliver_dest );
intf_put ( dest );
return xferbuf;
}
/**
* Report block device capacity
*
* @v intf Interface
* @v capacity Block device capacity
*/
void block_capacity ( struct interface *intf,
struct block_device_capacity *capacity ) {
struct interface *dest;
block_capacity_TYPE ( void * ) *op =
intf_get_dest_op ( intf, block_capacity, &dest );
void *object = intf_object ( dest );
if ( op ) {
op ( object, capacity );
} else {
/* Default is to do nothing */
}
intf_put ( dest );
}
/**
* Report peer discovery statistics
*
* @v intf Interface
* @v peer Selected peer (or NULL)
* @v peers List of available peers
*/
void peerdisc_stat ( struct interface *intf, struct peerdisc_peer *peer,
struct list_head *peers ) {
struct interface *dest;
peerdisc_stat_TYPE ( void * ) *op =
intf_get_dest_op ( intf, peerdisc_stat, &dest );
void *object = intf_object ( dest );
if ( op ) {
op ( object, peer, peers );
} else {
/* Default is to do nothing */
}
intf_put ( dest );
}
/**
* Get object's ACPI descriptor
*
* @v intf Interface
* @ret desc ACPI descriptor, or NULL
*/
struct acpi_descriptor * acpi_describe ( struct interface *intf ) {
struct interface *dest;
acpi_describe_TYPE ( void * ) *op =
intf_get_dest_op ( intf, acpi_describe, &dest );
void *object = intf_object ( dest );
struct acpi_descriptor *desc;
if ( op ) {
desc = op ( object );
} else {
desc = NULL;
}
intf_put ( dest );
return desc;
}
/**
* Name resolved
*
* @v intf Object interface
* @v sa Completed socket address (if successful)
*/
void resolv_done ( struct interface *intf, struct sockaddr *sa ) {
struct interface *dest;
resolv_done_TYPE ( void * ) *op =
intf_get_dest_op ( intf, resolv_done, &dest );
void *object = intf_object ( dest );
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " resolv_done\n",
INTF_INTF_DBG ( intf, dest ) );
if ( op ) {
op ( object, sa );
} else {
/* Default is to ignore resolutions */
}
intf_put ( dest );
}
/**
* Read block device capacity
*
* @v control Control interface
* @v data Data interface
* @ret rc Return status code
*/
int block_read_capacity ( struct interface *control, struct interface *data ) {
struct interface *dest;
block_read_capacity_TYPE ( void * ) *op =
intf_get_dest_op ( control, block_read_capacity, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, data );
} else {
/* Default is to fail to issue the command */
rc = -EOPNOTSUPP;
}
intf_put ( dest );
return rc;
}
/**
* Check flow control window
*
* @v intf Data transfer interface
* @ret len Length of window
*/
size_t xfer_window ( struct interface *intf ) {
struct interface *dest;
xfer_window_TYPE ( void * ) *op =
intf_get_dest_op ( intf, xfer_window, &dest );
void *object = intf_object ( dest );
size_t len;
if ( op ) {
len = op ( object );
} else {
/* Default is to provide an unlimited window */
len = ~( ( size_t ) 0 );
}
intf_put ( dest );
return len;
}
/**
* Close an object interface
*
* @v intf Object interface
* @v rc Reason for close
*
* Note that this function merely informs the destination object that
* the interface is about to be closed; it doesn't actually disconnect
* the interface. In most cases, you probably want to use
* intf_shutdown() or intf_restart() instead.
*/
void intf_close ( struct interface *intf, int rc ) {
struct interface *dest;
intf_close_TYPE ( void * ) *op =
intf_get_dest_op ( intf, intf_close, &dest );
void *object = intf_object ( dest );
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " close (%s)\n",
INTF_INTF_DBG ( intf, dest ), strerror ( rc ) );
if ( op ) {
op ( object, rc );
} else {
/* Default is to ignore intf_close() */
}
intf_put ( dest );
}
/**
* Issue SCSI command
*
* @v control SCSI control interface
* @v data SCSI data interface
* @v command SCSI command
* @ret tag Command tag, or negative error
*/
int scsi_command ( struct interface *control, struct interface *data,
struct scsi_cmd *command ) {
struct interface *dest;
scsi_command_TYPE ( void * ) *op =
intf_get_dest_op ( control, scsi_command, &dest );
void *object = intf_object ( dest );
int tap;
if ( op ) {
tap = op ( object, data, command );
} else {
/* Default is to fail to issue the command */
tap = -EOPNOTSUPP;
}
intf_put ( dest );
return tap;
}
/**
* Describe object in an ACPI table
*
* @v intf Interface
* @v acpi ACPI table
* @v len Length of ACPI table
* @ret rc Return status code
*/
int acpi_describe ( struct interface *intf,
struct acpi_description_header *acpi, size_t len ) {
struct interface *dest;
acpi_describe_TYPE ( void * ) *op =
intf_get_dest_op ( intf, acpi_describe, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, acpi, len );
} else {
/* Default is to fail to describe */
rc = -EOPNOTSUPP;
}
intf_put ( dest );
return rc;
}
/**
* Get object interface destination and operation method
*
* @v intf Object interface
* @v type Operation type
* @ret dest Destination interface
* @ret func Implementing method, or NULL
*/
void * intf_get_dest_op_untyped ( struct interface *intf, void *type,
struct interface **dest ) {
void *func;
while ( 1 ) {
/* Search for an implementing method provided by the
* current destination interface.
*/
func = intf_get_dest_op_no_passthru_untyped( intf, type, dest );
if ( func )
return func;
/* Pass through to the underlying interface, if applicable */
if ( ! ( intf = intf_get_passthru ( *dest ) ) )
return NULL;
intf_put ( *dest );
}
}
/**
* Write to block device
*
* @v control Control interface
* @v data Data interface
* @v lba Starting logical block address
* @v count Number of logical blocks
* @v buffer Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
int block_write ( struct interface *control, struct interface *data,
uint64_t lba, unsigned int count,
userptr_t buffer, size_t len ) {
struct interface *dest;
block_write_TYPE ( void * ) *op =
intf_get_dest_op ( control, block_write, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, data, lba, count, buffer, len );
} else {
/* Default is to fail to issue the command */
rc = -EOPNOTSUPP;
}
intf_put ( dest );
return rc;
}
/**
* Send redirection event
*
* @v intf Data transfer interface
* @v type New location type
* @v args Remaining arguments depend upon location type
* @ret rc Return status code
*/
int xfer_vredirect ( struct interface *intf, int type, va_list args ) {
struct interface tmp = INTF_INIT ( null_intf_desc );
struct interface *dest;
xfer_vredirect_TYPE ( void * ) *op =
intf_get_dest_op_no_passthru ( intf, xfer_vredirect, &dest );
void *object = intf_object ( dest );
int rc;
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " redirect\n",
INTF_INTF_DBG ( intf, dest ) );
if ( op ) {
rc = op ( object, type, args );
} else {
/* Default is to reopen the interface as instructed,
* then send xfer_window_changed() messages to both
* new child and parent interfaces. Since our
* original child interface is likely to be closed and
* unplugged as a result of the call to
* xfer_vreopen(), we create a temporary interface in
* order to be able to send xfer_window_changed() to
* the parent.
*/
intf_plug ( &tmp, dest );
rc = xfer_vreopen ( dest, type, args );
if ( rc == 0 ) {
xfer_window_changed ( dest );
xfer_window_changed ( &tmp );
}
intf_unplug ( &tmp );
}
if ( rc != 0 ) {
DBGC ( INTF_COL ( intf ), "INTF " INTF_INTF_FMT " redirect "
"failed: %s\n", INTF_INTF_DBG ( intf, dest ),
strerror ( rc ) );
}
intf_put ( dest );
return rc;
}