[PATCH bpf-next v2 4/5] selftests/bpf: xsk selftests - Socket Teardown - SKB, DRV

[Weqaar Janjua <weqaar.janjua@gmail.com>]

Adds following tests:

1. AF_XDP SKB mode
   c. Socket Teardown
      Create a Tx and a Rx socket, Tx from one socket, Rx on another.
      Destroy both sockets, then repeat multiple times. Only nopoll mode
      is used

2. AF_XDP DRV/Native mode
   c. Socket Teardown
   * Only copy mode is supported because veth does not currently support
     zero-copy mode

Signed-off-by: Weqaar Janjua <weqaar.a.janjua@intel.com>
---
 tools/testing/selftests/bpf/Makefile          |  4 ++-
 .../selftests/bpf/test_xsk_drv_poll.sh        |  3 --
 .../selftests/bpf/test_xsk_drv_teardown.sh    | 23 ++++++++++++
 .../selftests/bpf/test_xsk_skb_teardown.sh    | 20 +++++++++++
 tools/testing/selftests/bpf/xdpxceiver.c      | 35 ++++++++++++++++---
 tools/testing/selftests/bpf/xdpxceiver.h      |  2 ++
 6 files changed, 79 insertions(+), 8 deletions(-)
 create mode 100755 tools/testing/selftests/bpf/test_xsk_drv_teardown.sh
 create mode 100755 tools/testing/selftests/bpf/test_xsk_skb_teardown.sh

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 9dd3f3b9014f..515b29d321d7 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -76,7 +76,9 @@ TEST_PROGS := test_kmod.sh \
 	test_xsk_skb_nopoll.sh \
 	test_xsk_skb_poll.sh \
 	test_xsk_drv_nopoll.sh \
-	test_xsk_drv_poll.sh
+	test_xsk_drv_poll.sh \
+	test_xsk_skb_teardown.sh \
+	test_xsk_drv_teardown.sh
 
 TEST_PROGS_EXTENDED := with_addr.sh \
 	with_tunnels.sh \
diff --git a/tools/testing/selftests/bpf/test_xsk_drv_poll.sh b/tools/testing/selftests/bpf/test_xsk_drv_poll.sh
index 1fe488d5794a..46e0ae0cabed 100755
--- a/tools/testing/selftests/bpf/test_xsk_drv_poll.sh
+++ b/tools/testing/selftests/bpf/test_xsk_drv_poll.sh
@@ -17,7 +17,4 @@ execxdpxceiver params
 retval=$?
 test_status $retval "${TEST_NAME}"
 
-# Must be called in the last test to execute
-cleanup_exit ${VETH0} ${VETH1} ${NS1}
-
 test_exit $retval 0
diff --git a/tools/testing/selftests/bpf/test_xsk_drv_teardown.sh b/tools/testing/selftests/bpf/test_xsk_drv_teardown.sh
new file mode 100755
index 000000000000..28bf730b589e
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_xsk_drv_teardown.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright(c) 2020 Intel Corporation.
+
+# See test_xsk_prerequisites.sh for detailed information on tests
+
+. xsk_prereqs.sh
+. xsk_env.sh
+
+TEST_NAME="DRV SOCKET TEARDOWN"
+
+vethXDPnative ${VETH0} ${VETH1} ${NS1}
+
+params=("-N" "-T")
+execxdpxceiver params
+
+retval=$?
+test_status $retval "${TEST_NAME}"
+
+# Must be called in the last test to execute
+cleanup_exit ${VETH0} ${VETH1} ${NS1}
+
+test_exit $retval 0
diff --git a/tools/testing/selftests/bpf/test_xsk_skb_teardown.sh b/tools/testing/selftests/bpf/test_xsk_skb_teardown.sh
new file mode 100755
index 000000000000..3ceda125647b
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_xsk_skb_teardown.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright(c) 2020 Intel Corporation.
+
+# See test_xsk_prerequisites.sh for detailed information on tests
+
+. xsk_prereqs.sh
+. xsk_env.sh
+
+TEST_NAME="SKB SOCKET TEARDOWN"
+
+vethXDPgeneric ${VETH0} ${VETH1} ${NS1}
+
+params=("-S" "-T")
+execxdpxceiver params
+
+retval=$?
+test_status $retval "${TEST_NAME}"
+
+test_exit $retval 0
diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
index e998200502de..ba5de1ef9f64 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.c
+++ b/tools/testing/selftests/bpf/xdpxceiver.c
@@ -26,6 +26,9 @@
  *    generic XDP path. XDP hook from netif_receive_skb().
  *    a. nopoll - soft-irq processing
  *    b. poll - using poll() syscall
+ *    c. Socket Teardown
+ *       Create a Tx and a Rx socket, Tx from one socket, Rx on another. Destroy
+ *       both sockets, then repeat multiple times. Only nopoll mode is used
  *
  * 2. AF_XDP DRV/Native mode
  *    Works on any netdevice with XDP_REDIRECT support, driver dependent. Processes
@@ -33,10 +36,11 @@
  *    hook available just after DMA of buffer descriptor.
  *    a. nopoll
  *    b. poll
+ *    c. Socket Teardown
  *    - Only copy mode is supported because veth does not currently support
  *      zero-copy mode
  *
- * Total tests: 4
+ * Total tests: 6
  *
  * Flow:
  * -----
@@ -96,7 +100,8 @@ static void __exit_with_error(int error, const char *file, const char *func, int
 #define exit_with_error(error) __exit_with_error(error, __FILE__, __func__, __LINE__)
 
 #define print_ksft_result(void)\
-	(ksft_test_result_pass("PASS: %s %s\n", uut ? "DRV" : "SKB", opt_poll ? "POLL" : "NOPOLL"))
+	(ksft_test_result_pass("PASS: %s %s %s\n", uut ? "DRV" : "SKB", opt_poll ? "POLL" :\
+			       "NOPOLL", opt_teardown ? "Socket Teardown" : ""))
 
 static void pthread_init_mutex(void)
 {
@@ -321,6 +326,7 @@ static struct option long_options[] = {
 	{"xdp-skb", no_argument, 0, 'S'},
 	{"xdp-native", no_argument, 0, 'N'},
 	{"copy", no_argument, 0, 'c'},
+	{"tear-down", no_argument, 0, 'T'},
 	{"debug", optional_argument, 0, 'D'},
 	{"tx-pkt-count", optional_argument, 0, 'C'},
 	{0, 0, 0, 0}
@@ -337,6 +343,7 @@ static void usage(const char *prog)
 	    "  -S, --xdp-skb=n      Use XDP SKB mode\n"
 	    "  -N, --xdp-native=n   Enforce XDP DRV (native) mode\n"
 	    "  -c, --copy           Force copy mode\n"
+	    "  -T, --tear-down      Tear down sockets by repeatedly recreating them\n"
 	    "  -D, --debug          Debug mode - dump packets L2 - L5\n"
 	    "  -C, --tx-pkt-count=n Number of packets to send\n";
 	ksft_print_msg(str, prog);
@@ -427,7 +434,7 @@ static void parse_command_line(int argc, char **argv)
 	opterr = 0;
 
 	for (;;) {
-		c = getopt_long(argc, argv, "i:q:pSNcDC:", long_options, &option_index);
+		c = getopt_long(argc, argv, "i:q:pSNcTDC:", long_options, &option_index);
 
 		if (c == -1)
 			break;
@@ -465,6 +472,9 @@ static void parse_command_line(int argc, char **argv)
 		case 'c':
 			opt_xdp_bind_flags |= XDP_COPY;
 			break;
+		case 'T':
+			opt_teardown = 1;
+			break;
 		case 'D':
 			debug_pkt_dump = 1;
 			break;
@@ -853,6 +863,9 @@ static void *worker_testapp_validate(void *arg)
 
 		ksft_print_msg("Received %d packets on interface %s\n",
 			       pkt_counter, ((struct ifobject *)arg)->ifname);
+
+		if (opt_teardown)
+			ksft_print_msg("Destroying socket\n");
 	}
 
 	xsk_socket__delete(((struct ifobject *)arg)->xsk->xsk);
@@ -898,6 +911,20 @@ static void testapp_validate(void)
 		free(pkt_buf);
 	}
 
+	if (!opt_teardown)
+		print_ksft_result();
+}
+
+static void testapp_sockets(void)
+{
+	for (int i = 0; i < MAX_TEARDOWN_ITER; i++) {
+		pkt_counter = 0;
+		prev_pkt = -1;
+		sigvar = 0;
+		ksft_print_msg("Creating socket\n");
+		testapp_validate();
+	}
+
 	print_ksft_result();
 }
 
@@ -964,7 +991,7 @@ int main(int argc, char **argv)
 
 	ksft_set_plan(1);
 
-	testapp_validate();
+	opt_teardown ? testapp_sockets() : testapp_validate();
 
 	for (int i = 0; i < MAX_INTERFACES; i++)
 		free(ifdict[i]);
diff --git a/tools/testing/selftests/bpf/xdpxceiver.h b/tools/testing/selftests/bpf/xdpxceiver.h
index dba47e818466..9d2670f28d86 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.h
+++ b/tools/testing/selftests/bpf/xdpxceiver.h
@@ -21,6 +21,7 @@
 #define MAX_INTERFACE_NAME_CHARS 7
 #define MAX_INTERFACES_NAMESPACE_CHARS 10
 #define MAX_SOCKS 1
+#define MAX_TEARDOWN_ITER 10
 #define PKT_HDR_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
 			sizeof(struct udphdr))
 #define MIN_PKT_SIZE 64
@@ -55,6 +56,7 @@ static u32 opt_xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 static int opt_queue;
 static int opt_pkt_count;
 static int opt_poll;
+static int opt_teardown;
 static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
 static u8 pkt_data[XSK_UMEM__DEFAULT_FRAME_SIZE];
 static u32 pkt_counter;
-- 
2.20.1