From fbf1bad8fe8fc8a779668287abfe48af20359350 Mon Sep 17 00:00:00 2001
From: Edward Liaw <edliaw@google.com>
Date: Tue, 19 Apr 2022 22:54:43 +0000
Subject: [PATCH 05/20] psock_tpacket: version check

TX_RING support for TPACKET_V3 was added in this commit:

commit 7f953ab2ba46e8649537942c0a64668ca2ce5cc5
Author: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date:   Tue Jan 3 06:31:47 2017 -0800

    af_packet: TX_RING support for TPACKET_V3

which first appeared in 4.11. Do not attempt to test TX_RING
support for TPACKET_V3 on kernels earlier than this.

(cherry picked from commit 1584e465aa445831fc93bcd64d560ab5b89cb55d)
---
 tools/testing/selftests/net/psock_tpacket.c | 29 ++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/psock_tpacket.c b/tools/testing/selftests/net/psock_tpacket.c
index 4d5f317ab42c..9696c9e484d5 100644
--- a/tools/testing/selftests/net/psock_tpacket.c
+++ b/tools/testing/selftests/net/psock_tpacket.c
@@ -28,6 +28,7 @@
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/mman.h>
+#include <sys/utsname.h>
 #include <linux/if_packet.h>
 #include <linux/filter.h>
 #include <ctype.h>
@@ -832,9 +833,34 @@ static int test_tpacket(int version, int type)
 	return 0;
 }
 
+void get_kernel_version(int *version, int *patchlevel)
+{
+	int ret, sublevel;
+	struct utsname utsname;
+
+	ret = uname(&utsname);
+	if (ret) {
+		perror("uname");
+		exit(1);
+	}
+
+	ret = sscanf(utsname.release, "%d.%d.%d", version, patchlevel,
+		     &sublevel);
+	if (ret < 0) {
+		perror("sscanf");
+		exit(1);
+	} else if (ret != 3) {
+		printf("Malformed kernel version %s\n", &utsname.release);
+		exit(1);
+	}
+}
+
 int main(void)
 {
 	int ret = 0;
+	int version, patchlevel;
+
+	get_kernel_version(&version, &patchlevel);
 
 	ret |= test_tpacket(TPACKET_V1, PACKET_RX_RING);
 	ret |= test_tpacket(TPACKET_V1, PACKET_TX_RING);
@@ -843,7 +869,8 @@ int main(void)
 	ret |= test_tpacket(TPACKET_V2, PACKET_TX_RING);
 
 	ret |= test_tpacket(TPACKET_V3, PACKET_RX_RING);
-	ret |= test_tpacket(TPACKET_V3, PACKET_TX_RING);
+	if (version > 4 || (version == 4 && patchlevel >= 11))
+		ret |= test_tpacket(TPACKET_V3, PACKET_TX_RING);
 
 	if (ret)
 		return 1;
-- 
2.42.0.609.gbb76f46606-goog