diff options
| -rw-r--r-- | src/arch/x86/interface/pxe/pxe_udp.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/arch/x86/interface/pxe/pxe_udp.c b/src/arch/x86/interface/pxe/pxe_udp.c index 5a04f0865..a5d5eb77b 100644 --- a/src/arch/x86/interface/pxe/pxe_udp.c +++ b/src/arch/x86/interface/pxe/pxe_udp.c @@ -12,6 +12,7 @@ #include <ipxe/uaccess.h> #include <ipxe/process.h> #include <ipxe/netdevice.h> +#include <ipxe/malloc.h> #include <realmode.h> #include <pxe.h> @@ -482,3 +483,28 @@ struct pxe_api_call pxe_udp_api[] __pxe_api_call = { PXE_API_CALL ( PXENV_UDP_READ, pxenv_udp_read, struct s_PXENV_UDP_READ ), }; + +/** + * Discard some cached PXE UDP data + * + * @ret discarded Number of cached items discarded + */ +static unsigned int pxe_udp_discard ( void ) { + struct io_buffer *iobuf; + unsigned int discarded = 0; + + /* Try to discard the oldest received UDP packet */ + iobuf = list_first_entry ( &pxe_udp.list, struct io_buffer, list ); + if ( iobuf ) { + list_del ( &iobuf->list ); + free_iob ( iobuf ); + discarded++; + } + + return discarded; +} + +/** PXE UDP cache discarder */ +struct cache_discarder pxe_udp_discarder __cache_discarder ( CACHE_NORMAL ) = { + .discard = pxe_udp_discard, +}; |