[PATCH bpf-next v4 1/5] selftests/bpf: test_sockmap, check test failure

[Prashant Bhole]

Test failures are not identified because exit code of RX/TX threads
is not checked. Also threads are not returning correct exit code.

- Return exit code from threads depending on test execution status
- In main thread, check the exit code of RX/TX threads
- Skip error checking for corked tests as they are expected to timeout

Fixes: 16962b2404ac ("bpf: sockmap, add selftests")
Signed-off-by: Prashant Bhole <bhole_prashant...@lab.ntt.co.jp>
---
 tools/testing/selftests/bpf/test_sockmap.c | 27 +++++++++++++++++-----
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_sockmap.c 
b/tools/testing/selftests/bpf/test_sockmap.c
index eb17fae458e6..7b2008a144cb 100644
--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -429,8 +429,8 @@ static int sendmsg_test(struct sockmap_options *opt)
        struct msg_stats s = {0};
        int iov_count = opt->iov_count;
        int iov_buf = opt->iov_length;
+       int rx_status, tx_status;
        int cnt = opt->rate;
-       int status;
 
        errno = 0;
 
@@ -442,7 +442,7 @@ static int sendmsg_test(struct sockmap_options *opt)
        rxpid = fork();
        if (rxpid == 0) {
                if (opt->drop_expected)
-                       exit(1);
+                       exit(0);
 
                if (opt->sendpage)
                        iov_count = 1;
@@ -463,7 +463,9 @@ static int sendmsg_test(struct sockmap_options *opt)
                                "rx_sendmsg: TX: %zuB %fB/s %fGB/s RX: %zuB 
%fB/s %fGB/s\n",
                                s.bytes_sent, sent_Bps, sent_Bps/giga,
                                s.bytes_recvd, recvd_Bps, recvd_Bps/giga);
-               exit(1);
+               if (err && txmsg_cork)
+                       err = 0;
+               exit(err ? 1 : 0);
        } else if (rxpid == -1) {
                perror("msg_loop_rx: ");
                return errno;
@@ -491,14 +493,27 @@ static int sendmsg_test(struct sockmap_options *opt)
                                "tx_sendmsg: TX: %zuB %fB/s %f GB/s RX: %zuB 
%fB/s %fGB/s\n",
                                s.bytes_sent, sent_Bps, sent_Bps/giga,
                                s.bytes_recvd, recvd_Bps, recvd_Bps/giga);
-               exit(1);
+               exit(err ? 1 : 0);
        } else if (txpid == -1) {
                perror("msg_loop_tx: ");
                return errno;
        }
 
-       assert(waitpid(rxpid, &status, 0) == rxpid);
-       assert(waitpid(txpid, &status, 0) == txpid);
+       assert(waitpid(rxpid, &rx_status, 0) == rxpid);
+       assert(waitpid(txpid, &tx_status, 0) == txpid);
+       if (WIFEXITED(rx_status)) {
+               err = WEXITSTATUS(rx_status);
+               if (err) {
+                       fprintf(stderr, "rx thread exited with err %d. ", err);
+                       goto out;
+               }
+       }
+       if (WIFEXITED(tx_status)) {
+               err = WEXITSTATUS(tx_status);
+               if (err)
+                       fprintf(stderr, "tx thread exited with err %d. ", err);
+       }
+out:
        return err;
 }
 
-- 
2.17.0