[V2] app/testpmd: fix forward stats after clear stats command
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Commit Message
From: "Wei Hu (Xavier)" <xavier.huwei@huawei.com>
Currently, when running start/clear stats&xstats/stop command many times
based on testpmd application, there are incorrect forward Rx/Tx-packets
stats as below:
---------------------- Forward statistics for port 0 --------------
RX-packets: 18446744073709544808 RX-dropped: 0 <snip>
TX-packets: 18446744073709536616 TX-dropped: 0 <snip>
--------------------------------------------------------------------
The root cause as below:
1. The struct rte_port of testpmd.h has a member variable
"struct rte_eth_stats stats" to store the last port statistics.
2. When runnig start command, it execute cmd_start_parsed ->
start_packet_forwarding -> fwd_stats_reset, which call rte_eth_stats_get
API function to save current port statistics.
3. When running stop command, it execute fwd_stats_display, which call
rte_eth_stats_get to get current port statistics, and then minus last
port statistics.
4. If we run clear stats or xstats after start command, then run stop,
it may display above incorrect stats because the current Rx/Tx-packets
is lower than the last saved RX/TX-packets(uint64_t overflow).
This patch fixes it by clearing last port statistics when executing
"clear stats/xstats" command.
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
---
v1 -> v2:
Update the title and the documentation
(doc/guides/testpmd_app_ug/testpmd_funcs.rst) based on
Ferruh Yigit's comment as below:
http://patches.dpdk.org/patch/69252/
---
app/test-pmd/config.c | 11 +++++++++++
doc/guides/testpmd_app_ug/testpmd_funcs.rst | 2 +-
2 files changed, 12 insertions(+), 1 deletion(-)
@@ -234,10 +234,16 @@ nic_stats_display(portid_t port_id)
void
nic_stats_clear(portid_t port_id)
{
+ struct rte_port *port;
+
if (port_id_is_invalid(port_id, ENABLED_WARN)) {
print_valid_ports();
return;
}
+
+ port = &ports[port_id];
+ /* clear last port statistics because eth stats reset */
+ memset(&port->stats, 0, sizeof(port->stats));
rte_eth_stats_reset(port_id);
printf("\n NIC statistics for port %d cleared\n", port_id);
}
@@ -308,12 +314,17 @@ nic_xstats_display(portid_t port_id)
void
nic_xstats_clear(portid_t port_id)
{
+ struct rte_port *port;
int ret;
if (port_id_is_invalid(port_id, ENABLED_WARN)) {
print_valid_ports();
return;
}
+
+ port = &ports[port_id];
+ /* clear last port statistics because eth xstats(include stats) reset */
+ memset(&port->stats, 0, sizeof(port->stats));
ret = rte_eth_xstats_reset(port_id);
if (ret != 0) {
printf("%s: Error: failed to reset xstats (port %u): %s",
@@ -237,7 +237,7 @@ Display the RSS hash functions and RSS hash key of a port::
clear port
~~~~~~~~~~
-Clear the port statistics for a given port or for all ports::
+Clear the port statistics and forward engine statistics for a given port or for all ports::
testpmd> clear port (info|stats|xstats|fdir|stat_qmap) (port_id|all)