selftests/xsk: remove unnecessary code in control path

Remove unnecessary code in the control path. This is located in the
file xsk.c that was moved from libbpf when the xsk support there was
deprecated. Some of the code there is not needed anymore as the
selftests are only guaranteed to run on the kernel it is shipped
with. Therefore, all the code that has to deal with compatibility of
older kernels can be dropped and also any other function that is not
of any use for the tests.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230111093526.11682-11-magnus.karlsson@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/xsk.h

@@ -197,21 +197,12 @@ struct xsk_umem_config {
 	__u32 flags;
 };
 
-int xsk_setup_xdp_prog_xsk(struct xsk_socket *xsk, int *xsks_map_fd);
-int xsk_setup_xdp_prog(int ifindex, int *xsks_map_fd);
-int xsk_socket__update_xskmap(struct xsk_socket *xsk, int xsks_map_fd);
-
-/* Flags for the libbpf_flags field. */
-#define XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD (1 << 0)
-
 int xsk_load_xdp_program(int *xsk_map_fd, int *prog_fd);
 int xsk_attach_xdp_program(int ifindex, int prog_fd, u32 xdp_flags);
 
 struct xsk_socket_config {
 	__u32 rx_size;
 	__u32 tx_size;
-	__u32 libbpf_flags;
-	__u32 xdp_flags;
 	__u16 bind_flags;
 };
 

tools/testing/selftests/bpf/xskxceiver.c

@@ -102,12 +102,6 @@
 #include <linux/filter.h>
 #include "../kselftest.h"
 
-/* AF_XDP APIs were moved into libxdp and marked as deprecated in libbpf.
- * Until xskxceiver is either moved or re-writed into libxdp, suppress
- * deprecation warnings in this file
- */
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-
 static const char *MAC1 = "\x00\x0A\x56\x9E\xEE\x62";
 static const char *MAC2 = "\x00\x0A\x56\x9E\xEE\x61";
 static const char *IP1 = "192.168.100.162";
@@ -326,8 +320,6 @@ static int __xsk_configure_socket(struct xsk_socket_info *xsk, struct xsk_umem_i
 	xsk->umem = umem;
 	cfg.rx_size = xsk->rxqsize;
 	cfg.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS;
-	cfg.libbpf_flags = XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD;
-	cfg.xdp_flags = ifobject->xdp_flags;
 	cfg.bind_flags = ifobject->bind_flags;
 	if (shared)
 		cfg.bind_flags |= XDP_SHARED_UMEM;