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bpf: Selftests, improve test_sockmap total bytes counter 

The recv thread in test_sockmap waits to receive all bytes from sender but
in the case we use pop data it may wait for more bytes then actually being
sent. This stalls the test harness for multiple seconds. Because this
happens in multiple tests it slows time to run the selftest.

Fix by doing a better job of accounting for total bytes when pop helpers
are used.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://lore.kernel.org/bpf/158939726542.15176.5964532245173539540.stgit@john-Precision-5820-Tower
This commit is contained in:
John Fastabend 2020-05-13 12:14:25 -07:00 committed by Daniel Borkmann
parent 248aba1d52
commit 18d4e900a4
1 changed files with 8 additions and 3 deletions
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11
tools/testing/selftests/bpf/test_sockmap.c
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@ -502,9 +502,10 @@ static int msg_loop(int fd, int iov_count, int iov_length, int cnt,
* paths.
*/
total_bytes = (float)iov_count * (float)iov_length * (float)cnt;
txmsg_pop_total = txmsg_pop;
if (txmsg_apply)
txmsg_pop_total *= (total_bytes / txmsg_apply);
txmsg_pop_total = txmsg_pop * (total_bytes / txmsg_apply);
else
txmsg_pop_total = txmsg_pop * cnt;
total_bytes -= txmsg_pop_total;
err = clock_gettime(CLOCK_MONOTONIC, &s->start);
if (err < 0)
@ -638,8 +639,12 @@ static int sendmsg_test(struct sockmap_options *opt)
rxpid = fork();
if (rxpid == 0) {
iov_buf -= (txmsg_pop - txmsg_start_pop + 1);
if (opt->drop_expected)
exit(0);
_exit(0);
if (!iov_buf) /* zero bytes sent case */
_exit(0);
if (opt->sendpage)
iov_count = 1;