[PATCH] app/testpmd: fix bonding mode set

["Min Hu (Connor)" <humin29@huawei.com>]

when start testpmd, and type command like this, it will lead to
Segmentation fault, like:

testpmd> create bonded device 4 0
testpmd> add bonding slave 0 2
testpmd> add bonding slave 1 2
testpmd> port start 2
testpmd> set bonding mode 0 2
testpmd> quit
Stopping port 0...
Stopping ports...
...
Bye...
Segmentation fault

The reason to the bug is that rte timer do not be cancelled when quit.
That is, in 'bond_ethdev_start', resources are allocated according to
different bonding mode. In 'bond_ethdev_stop', resources are free by
the corresponding mode.

For example, 'bond_ethdev_start' start bond_mode_8023ad_ext_periodic_cb
timer for bonding mode 4. and 'bond_ethdev_stop' cancel the timer only
when the current bonding mode is 4. If the bonding mode is changed,
and directly quit the process, the timer will still on, and freed memory
will be accessed, then segmentation fault.

'bonding mode'changed means resources changed, reallocate resources for
different mode should be done, that is, device should be restarted.

Fixes: 2950a769315e ("bond: testpmd support")
Cc: stable@dpdk.org

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 app/test-pmd/cmdline.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index e626b1c7d9..2c47ab0f18 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -5915,6 +5915,19 @@ static void cmd_set_bonding_mode_parsed(void *parsed_result,
 {
 	struct cmd_set_bonding_mode_result *res = parsed_result;
 	portid_t port_id = res->port_id;
+	struct rte_port *port = &ports[port_id];
+
+	/*
+	 * Bonding mode changed means resources of device changed, like whether
+	 * started rte timer or not. Device should be restarted when resources
+	 * of device changed.
+	 */
+	if (port->port_status != RTE_PORT_STOPPED) {
+		fprintf(stderr,
+			"\t Error: Can't config bonding mode when port %d is not stopped\n",
+			port_id);
+		return;
+	}
 
 	/* Set the bonding mode for the relevant port. */
 	if (0 != rte_eth_bond_mode_set(port_id, res->value))
-- 
2.33.0