selftests: xsk: Specify number of sockets to create

Add the ability in the test specification to specify numbers of
sockets to create. The default is one socket. This is then used to
remove test specific if-statements around the bpf_res tests.

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/20210907071928.9750-12-magnus.karlsson@gmail.com

tools/testing/selftests/bpf/xdpxceiver.c

@@ -231,7 +231,7 @@ static void gen_udp_csum(struct udphdr *udp_hdr, struct iphdr *ip_hdr)
 	    udp_csum(ip_hdr->saddr, ip_hdr->daddr, UDP_PKT_SIZE, IPPROTO_UDP, (u16 *)udp_hdr);
 }
 
-static int xsk_configure_umem(struct xsk_umem_info *umem, void *buffer, u64 size, int idx)
+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,
@@ -410,6 +410,7 @@ static void __test_spec_init(struct test_spec *test, struct ifobject *ifobj_tx,
 	test->ifobj_rx = ifobj_rx;
 	test->current_step = 0;
 	test->total_steps = 1;
+	test->nb_sockets = 1;
 }
 
 static void test_spec_init(struct test_spec *test, struct ifobject *ifobj_tx,
@@ -770,46 +771,37 @@ static void tx_stats_validate(struct ifobject *ifobject)
 
 static void thread_common_ops(struct test_spec *test, struct ifobject *ifobject)
 {
-	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;
-	void *bufs;
+	u32 i;
 
 	ifobject->ns_fd = switch_namespace(ifobject->nsname);
 
-	if (test_type == TEST_TYPE_BPF_RES)
-		mmap_sz *= 2;
-
-	bufs = mmap(NULL, mmap_sz, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
-	if (bufs == MAP_FAILED)
-		exit_with_error(errno);
+	for (i = 0; i < test->nb_sockets; i++) {
+		u64 umem_sz = ifobject->umem->num_frames * ifobject->umem->frame_size;
+		int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
+		u32 ctr = 0;
+		void *bufs;
 
-	while (ctr++ < SOCK_RECONF_CTR) {
-		ret = xsk_configure_umem(&ifobject->umem_arr[0], bufs, umem_sz, 0);
-		if (ret)
-			exit_with_error(-ret);
+		bufs = mmap(NULL, umem_sz, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
+		if (bufs == MAP_FAILED)
+			exit_with_error(errno);
 
-		ret = xsk_configure_socket(&ifobject->xsk_arr[0], &ifobject->umem_arr[0],
-					   ifobject, 0);
-		if (!ret)
-			break;
+		while (ctr++ < SOCK_RECONF_CTR) {
+			int ret;
 
-		/* Retry Create Socket if it fails as xsk_socket__create() is asynchronous */
-		if (ctr >= SOCK_RECONF_CTR)
-			exit_with_error(-ret);
-		usleep(USLEEP_MAX);
-	}
+			ret = xsk_configure_umem(&ifobject->umem_arr[i], bufs, umem_sz);
+			if (ret)
+				exit_with_error(-ret);
 
-	if (test_type == TEST_TYPE_BPF_RES) {
-		ret = xsk_configure_umem(&ifobject->umem_arr[1], (u8 *)bufs + umem_sz, umem_sz, 1);
-		if (ret)
-			exit_with_error(-ret);
+			ret = xsk_configure_socket(&ifobject->xsk_arr[i], &ifobject->umem_arr[i],
+						   ifobject, i);
+			if (!ret)
+				break;
 
-		ret = xsk_configure_socket(&ifobject->xsk_arr[1], &ifobject->umem_arr[1],
-					   ifobject, 1);
-		if (ret)
-			exit_with_error(-ret);
+			/* Retry if it fails as xsk_socket__create() is asynchronous */
+			if (ctr >= SOCK_RECONF_CTR)
+				exit_with_error(-ret);
+			usleep(USLEEP_MAX);
+		}
 	}
 
 	ifobject->umem = &ifobject->umem_arr[0];
@@ -959,6 +951,7 @@ static void testapp_bpf_res(struct test_spec *test)
 {
 	test_spec_set_name(test, "BPF_RES");
 	test->total_steps = 2;
+	test->nb_sockets = 2;
 	testapp_validate_traffic(test);
 
 	swap_xsk_resources(test->ifobj_tx, test->ifobj_rx);

tools/testing/selftests/bpf/xdpxceiver.h

@@ -24,7 +24,6 @@
 #define MAX_SOCKETS 2
 #define MAX_TEST_NAME_SIZE 32
 #define MAX_TEARDOWN_ITER 10
-#define MAX_BPF_ITER 2
 #define PKT_HDR_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
 			sizeof(struct udphdr))
 #define MIN_PKT_SIZE 64
@@ -137,6 +136,7 @@ struct test_spec {
 	struct ifobject *ifobj_rx;
 	u16 total_steps;
 	u16 current_step;
+	u16 nb_sockets;
 	char name[MAX_TEST_NAME_SIZE];
 };