selftests: xsk: Make frame_size configurable

Make the frame size configurable instead of it being hard coded to a
default. This is a property of the umem and will make it possible to
implement tests for different umem frame sizes in a later patch.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/bpf/20210907071928.9750-7-magnus.karlsson@gmail.com

tools/testing/selftests/bpf/xdpxceiver.c

@@ -240,7 +240,7 @@ static int xsk_configure_umem(struct xsk_umem_info *umem, void *buffer, u64 size
 	struct xsk_umem_config cfg = {
 		.fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
 		.comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
-		.frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
+		.frame_size = umem->frame_size,
 		.frame_headroom = umem->frame_headroom,
 		.flags = XSK_UMEM__DEFAULT_FLAGS
 	};
@@ -264,7 +264,7 @@ static void xsk_populate_fill_ring(struct xsk_umem_info *umem)
 	if (ret != XSK_RING_PROD__DEFAULT_NUM_DESCS)
 		exit_with_error(-ret);
 	for (i = 0; i < XSK_RING_PROD__DEFAULT_NUM_DESCS; i++)
-		*xsk_ring_prod__fill_addr(&umem->fq, idx++) = i * XSK_UMEM__DEFAULT_FRAME_SIZE;
+		*xsk_ring_prod__fill_addr(&umem->fq, idx++) = i * umem->frame_size;
 	xsk_ring_prod__submit(&umem->fq, XSK_RING_PROD__DEFAULT_NUM_DESCS);
 }
 
@@ -407,6 +407,7 @@ static void __test_spec_init(struct test_spec *test, struct ifobject *ifobj_tx,
 			memset(&ifobj->umem_arr[j], 0, sizeof(ifobj->umem_arr[j]));
 			memset(&ifobj->xsk_arr[j], 0, sizeof(ifobj->xsk_arr[j]));
 			ifobj->umem_arr[j].num_frames = DEFAULT_PKT_CNT / 4;
+			ifobj->umem_arr[j].frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
 			ifobj->xsk_arr[j].rxqsize = XSK_RING_CONS__DEFAULT_NUM_DESCS;
 		}
 	}
@@ -450,7 +451,7 @@ static struct pkt_stream *pkt_stream_generate(struct xsk_umem_info *umem, u32 nb
 
 	pkt_stream->nb_pkts = nb_pkts;
 	for (i = 0; i < nb_pkts; i++) {
-		pkt_stream->pkts[i].addr = (i % umem->num_frames) * XSK_UMEM__DEFAULT_FRAME_SIZE;
+		pkt_stream->pkts[i].addr = (i % umem->num_frames) * umem->frame_size;
 		pkt_stream->pkts[i].len = pkt_len;
 		pkt_stream->pkts[i].payload = i;
 	}
@@ -768,7 +769,7 @@ static void tx_stats_validate(struct ifobject *ifobject)
 
 static void thread_common_ops(struct ifobject *ifobject, void *bufs)
 {
-	u64 umem_sz = ifobject->umem->num_frames * XSK_UMEM__DEFAULT_FRAME_SIZE;
+	u64 umem_sz = ifobject->umem->num_frames * ifobject->umem->frame_size;
 	int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
 	size_t mmap_sz = umem_sz;
 	int ctr = 0, ret;
@@ -991,7 +992,7 @@ static void testapp_stats(struct test_spec *test)
 
 		switch (stat_test_type) {
 		case STAT_TEST_RX_DROPPED:
-			test->ifobj_rx->umem->frame_headroom = XSK_UMEM__DEFAULT_FRAME_SIZE -
+			test->ifobj_rx->umem->frame_headroom = test->ifobj_rx->umem->frame_size -
 				XDP_PACKET_HEADROOM - 1;
 			break;
 		case STAT_TEST_RX_FULL:

tools/testing/selftests/bpf/xdpxceiver.h

@@ -87,6 +87,7 @@ struct xsk_umem_info {
 	u32 num_frames;
 	u32 frame_headroom;
 	void *buffer;
+	u32 frame_size;
 };
 
 struct xsk_socket_info {