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selftests: net: udpgso_bench_tx: Cater for pending datagrams zerocopy benchmarking

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[ Upstream commit 329c9cd769 ]

The test tool can check that the zerocopy number of completions value is
valid taking into consideration the number of datagram send calls. This can
catch the system into a state where the datagrams are still in the system
(for example in a qdisk, waiting for the network interface to return a
completion notification, etc).

This change adds a retry logic of computing the number of completions up to
a configurable (via CLI) timeout (default: 2 seconds).

Fixes: 79ebc3c260 ("net/udpgso_bench_tx: options to exercise TX CMSG")
Signed-off-by: Andrei Gherzan <andrei.gherzan@canonical.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20230201001612.515730-4-andrei.gherzan@canonical.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrei Gherzan 2023-02-01 00:16:16 +00:00 committed by Greg Kroah-Hartman
parent 14782ea872
commit 462a2c1bdf
1 changed files with 27 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
tools/testing/selftests/net/udpgso_bench_tx.c
View file

@ -62,6 +62,7 @@ static int cfg_payload_len = (1472 * 42);
static int cfg_port = 8000;
static int cfg_runtime_ms = -1;
static bool cfg_poll;
static int cfg_poll_loop_timeout_ms = 2000;
static bool cfg_segment;
static bool cfg_sendmmsg;
static bool cfg_tcp;
@ -235,16 +236,17 @@ static void flush_errqueue_recv(int fd)
}
}
static void flush_errqueue(int fd, const bool do_poll)
static void flush_errqueue(int fd, const bool do_poll,
unsigned long poll_timeout, const bool poll_err)
{
if (do_poll) {
struct pollfd fds = {0};
int ret;
fds.fd = fd;
ret = poll(&fds, 1, 500);
ret = poll(&fds, 1, poll_timeout);
if (ret == 0) {
if (cfg_verbose)
if ((cfg_verbose) && (poll_err))
fprintf(stderr, "poll timeout\n");
} else if (ret < 0) {
error(1, errno, "poll");
@ -254,6 +256,20 @@ static void flush_errqueue(int fd, const bool do_poll)
flush_errqueue_recv(fd);
}
static void flush_errqueue_retry(int fd, unsigned long num_sends)
{
unsigned long tnow, tstop;
bool first_try = true;
tnow = gettimeofday_ms();
tstop = tnow + cfg_poll_loop_timeout_ms;
do {
flush_errqueue(fd, true, tstop - tnow, first_try);
first_try = false;
tnow = gettimeofday_ms();
} while ((stat_zcopies != num_sends) && (tnow < tstop));
}
static int send_tcp(int fd, char *data)
{
int ret, done = 0, count = 0;
@ -413,7 +429,8 @@ static int send_udp_segment(int fd, char *data)
static void usage(const char *filepath)
{
error(1, 0, "Usage: %s [-46acmHPtTuvz] [-C cpu] [-D dst ip] [-l secs] [-M messagenr] [-p port] [-s sendsize] [-S gsosize]",
error(1, 0, "Usage: %s [-46acmHPtTuvz] [-C cpu] [-D dst ip] [-l secs] "
"[-L secs] [-M messagenr] [-p port] [-s sendsize] [-S gsosize]",
filepath);
}
@ -423,7 +440,7 @@ static void parse_opts(int argc, char **argv)
int max_len, hdrlen;
int c;
while ((c = getopt(argc, argv, "46acC:D:Hl:mM:p:s:PS:tTuvz")) != -1) {
while ((c = getopt(argc, argv, "46acC:D:Hl:L:mM:p:s:PS:tTuvz")) != -1) {
switch (c) {
case '4':
if (cfg_family != PF_UNSPEC)
@ -452,6 +469,9 @@ static void parse_opts(int argc, char **argv)
case 'l':
cfg_runtime_ms = strtoul(optarg, NULL, 10) * 1000;
break;
case 'L':
cfg_poll_loop_timeout_ms = strtoul(optarg, NULL, 10) * 1000;
break;
case 'm':
cfg_sendmmsg = true;
break;
@ -679,7 +699,7 @@ int main(int argc, char **argv)
num_sends += send_udp(fd, buf[i]);
num_msgs++;
if ((cfg_zerocopy && ((num_msgs & 0xF) == 0)) || cfg_tx_tstamp)
flush_errqueue(fd, cfg_poll);
flush_errqueue(fd, cfg_poll, 500, true);
if (cfg_msg_nr && num_msgs >= cfg_msg_nr)
break;
@ -698,7 +718,7 @@ int main(int argc, char **argv)
} while (!interrupted && (cfg_runtime_ms == -1 || tnow < tstop));
if (cfg_zerocopy || cfg_tx_tstamp)
flush_errqueue(fd, true);
flush_errqueue_retry(fd, num_sends);
if (close(fd))
error(1, errno, "close");