diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/xfer.c | 27 | ||||
| -rw-r--r-- | src/include/ipxe/xfer.h | 4 |
2 files changed, 31 insertions, 0 deletions
diff --git a/src/core/xfer.c b/src/core/xfer.c index 222af52a8..a755d438a 100644 --- a/src/core/xfer.c +++ b/src/core/xfer.c @@ -105,6 +105,33 @@ size_t xfer_window ( struct interface *intf ) { } /** + * 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 ); +} + +/** * Allocate I/O buffer * * @v intf Data transfer interface diff --git a/src/include/ipxe/xfer.h b/src/include/ipxe/xfer.h index 2aa35f8de..0c0303279 100644 --- a/src/include/ipxe/xfer.h +++ b/src/include/ipxe/xfer.h @@ -57,6 +57,10 @@ extern size_t xfer_window ( struct interface *intf ); #define xfer_window_TYPE( object_type ) \ typeof ( size_t ( object_type ) ) +extern void xfer_window_changed ( struct interface *intf ); +#define xfer_window_changed_TYPE( object_type ) \ + typeof ( void ( object_type ) ) + extern struct io_buffer * xfer_alloc_iob ( struct interface *intf, size_t len ); #define xfer_alloc_iob_TYPE( object_type ) \ |