selftests/net: report rcv_mss in tcp_mmap

tcp_mmap tests TCP_ZEROCOPY_RECEIVE. If 0% of data is received using
mmap, this may be due to mss. Report rcv_mss to identify this cause.

Output of a run failed due to too small mss:

    received 32768 MB (0 % mmap'ed) in 8.40458 s, 32.7057 Gbit
      cpu usage user:0.027922 sys:8.21126, 251.44 usec per MB, 3252 c-switches, rcv_mss 1428

Output on a successful run:

    received 32768 MB (99.9507 % mmap'ed) in 4.69023 s, 58.6064 Gbit
      cpu usage user:0.029172 sys:2.56105, 79.0473 usec per MB, 57591 c-switches, rcv_mss 4096

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/tcp_mmap.c b/tools/testing/selftests/net/tcp_mmap.c
index 6e59b14..4fcce51 100644 (file)
--- a/tools/testing/selftests/net/tcp_mmap.c
+++ b/tools/testing/selftests/net/tcp_mmap.c
@@ -153,6 +153,19 @@ static void *mmap_large_buffer(size_t need, size_t *allocated)
        return buffer;
 }
 
+static uint32_t tcp_info_get_rcv_mss(int fd)
+{
+       socklen_t sz = sizeof(struct tcp_info);
+       struct tcp_info info;
+
+       if (getsockopt(fd, IPPROTO_TCP, TCP_INFO, &info, &sz)) {
+               fprintf(stderr, "Error fetching TCP_INFO\n");
+               return 0;
+       }
+
+       return info.tcpi_rcv_mss;
+}
+
 void *child_thread(void *arg)
 {
        unsigned char digest[SHA256_DIGEST_LENGTH];
@@ -288,7 +301,7 @@ end:
                total_usec = 1000000*ru.ru_utime.tv_sec + ru.ru_utime.tv_usec +
                             1000000*ru.ru_stime.tv_sec + ru.ru_stime.tv_usec;
                printf("received %lg MB (%lg %% mmap'ed) in %lg s, %lg Gbit\n"
-                      "  cpu usage user:%lg sys:%lg, %lg usec per MB, %lu c-switches\n",
+                      "  cpu usage user:%lg sys:%lg, %lg usec per MB, %lu c-switches, rcv_mss %u\n",
                                total / (1024.0 * 1024.0),
                                100.0*total_mmap/total,
                                (double)delta_usec / 1000000.0,
@@ -296,7 +309,8 @@ end:
                                (double)ru.ru_utime.tv_sec + (double)ru.ru_utime.tv_usec / 1000000.0,
                                (double)ru.ru_stime.tv_sec + (double)ru.ru_stime.tv_usec / 1000000.0,
                                (double)total_usec/mb,
-                               ru.ru_nvcsw);
+                               ru.ru_nvcsw,
+                               tcp_info_get_rcv_mss(fd));
        }
 error:
        munmap(buffer, buffer_sz);