1 TX_RING support for TPACKET_V3 was added in this commit: 2 3 commit 7f953ab2ba46e8649537942c0a64668ca2ce5cc5 4 Author: Sowmini Varadhan <sowmini.varadhan (a] oracle.com> 5 Date: Tue Jan 3 06:31:47 2017 -0800 6 7 af_packet: TX_RING support for TPACKET_V3 8 9 which first appeared in 4.11. Do not attempt to test TX_RING 10 support for TPACKET_V3 on kernels earlier than this. 11 12 diff --git a/tools/testing/selftests/net/psock_tpacket.c b/tools/testing/selftests/net/psock_tpacket.c 13 index e795a41c4771..c50375f51b2e 100644 14 --- a/tools/testing/selftests/net/psock_tpacket.c 15 +++ b/tools/testing/selftests/net/psock_tpacket.c 16 @@ -42,6 +42,7 @@ 17 #include <sys/stat.h> 18 #include <sys/socket.h> 19 #include <sys/mman.h> 20 +#include <sys/utsname.h> 21 #include <linux/if_packet.h> 22 #include <linux/filter.h> 23 #include <ctype.h> 24 @@ -844,9 +845,34 @@ static int test_tpacket(int version, int type) 25 return 0; 26 } 27 28 +void get_kernel_version(int *version, int *patchlevel) 29 +{ 30 + int ret, sublevel; 31 + struct utsname utsname; 32 + 33 + ret = uname(&utsname); 34 + if (ret) { 35 + perror("uname"); 36 + exit(1); 37 + } 38 + 39 + ret = sscanf(utsname.release, "%d.%d.%d", version, patchlevel, 40 + &sublevel); 41 + if (ret < 0) { 42 + perror("sscanf"); 43 + exit(1); 44 + } else if (ret != 3) { 45 + printf("Malformed kernel version %s\n", &utsname.release); 46 + exit(1); 47 + } 48 +} 49 + 50 int main(void) 51 { 52 int ret = 0; 53 + int version, patchlevel; 54 + 55 + get_kernel_version(&version, &patchlevel); 56 57 ret |= test_tpacket(TPACKET_V1, PACKET_RX_RING); 58 ret |= test_tpacket(TPACKET_V1, PACKET_TX_RING); 59 @@ -855,7 +881,8 @@ int main(void) 60 ret |= test_tpacket(TPACKET_V2, PACKET_TX_RING); 61 62 ret |= test_tpacket(TPACKET_V3, PACKET_RX_RING); 63 - ret |= test_tpacket(TPACKET_V3, PACKET_TX_RING); 64 + if (version > 4 || (version == 4 && patchlevel >= 11)) 65 + ret |= test_tpacket(TPACKET_V3, PACKET_TX_RING); 66 67 if (ret) 68 return 1; 69
