[dpdk-stable] [PATCH V3 1/7] app/testpmd: fix forward lcores number when DCB test

[dpdk-stable] [PATCH V3 1/7] app/testpmd: fix forward lcores number when DCB test

[Huisong Li]

Currently, 'nb_fwd_lcores' value are both adjusted based on
'nb_fwd_streams' in rss/simple/icmp_echo_fwd_config_setup.
But the operation is missing in dcb_fwd_config_setup, which
may lead to a bad behavior in which multiple polling threads
operate on the same queue. In this case, the device sends and
receives packets, causing unexpected results. The procedure is
 as follows:
1/ run testpmd with "--rxq=8 --txq=8"
2/ port stop all
3/ set nbcore 8
4/ port config 0 dcb vt off 4 pfc on
5/ port config all rxq 16
6/ port config all txq 16
7/ port start all
8/ set fwd mac
9/ start

For the DCB forwarding test, each core is assigned to each
traffic class and each core is assigned a multi-stream.
Therefore, 'nb_fwd_lcores' value needs to be adjusted based
 on 'total_tc_num' in all forwarding ports.

Fixes: 900550de04a7 ("app/testpmd: add dcb support")
Fixes: ce8d561418d4 ("app/testpmd: add port configuration settings")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
---
 app/test-pmd/config.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index ccb9bd3..03ee40c 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -2961,6 +2961,21 @@ rss_fwd_config_setup(void)
 	}
 }
 
+static uint16_t
+get_fwd_port_total_tc_num(void)
+{
+	struct rte_eth_dcb_info dcb_info;
+	uint16_t total_tc_num = 0;
+	unsigned int i;
+
+	for (i = 0; i < nb_fwd_ports; i++) {
+		(void)rte_eth_dev_get_dcb_info(fwd_ports_ids[i], &dcb_info);
+		total_tc_num += dcb_info.nb_tcs;
+	}
+
+	return total_tc_num;
+}
+
 /**
  * For the DCB forwarding test, each core is assigned on each traffic class.
  *
@@ -2980,12 +2995,16 @@ dcb_fwd_config_setup(void)
 	lcoreid_t  lc_id;
 	uint16_t nb_rx_queue, nb_tx_queue;
 	uint16_t i, j, k, sm_id = 0;
+	uint16_t total_tc_num;
 	uint8_t tc = 0;
 
 	cur_fwd_config.nb_fwd_lcores = (lcoreid_t) nb_fwd_lcores;
 	cur_fwd_config.nb_fwd_ports = nb_fwd_ports;
 	cur_fwd_config.nb_fwd_streams =
 		(streamid_t) (nb_rxq * cur_fwd_config.nb_fwd_ports);
+	total_tc_num = get_fwd_port_total_tc_num();
+	if (cur_fwd_config.nb_fwd_lcores > total_tc_num)
+		cur_fwd_config.nb_fwd_lcores = total_tc_num;
 
 	/* reinitialize forwarding streams */
 	init_fwd_streams();
-- 
2.7.4

[dpdk-stable] [PATCH V3 2/7] app/testpmd: fix DCB forwarding configuration

[Huisong Li]

After DCB mode is configured, the operations of port stop and port start
change the value of the global variable "dcb_test", As a result, the
forwarding configuration from DCB to RSS mode, namely,
“dcb_fwd_config_setup()” to "rss_fwd_config_setup()".

Currently, the 'dcb_flag' field in struct 'rte_port' indicates whether
 the port is configured with DCB. And it is sufficient to have 'dcb_config'
as a global variable to control the DCB test status. So this patch deletes
the "dcb_test".

In addition, the 'dcb_config' is first set to 1 first in
init_port_dcb_config(), but the function may fail.
 So it should be moved to the end.

Fixes: 900550de04a7 ("app/testpmd: add dcb support")
Fixes: ce8d561418d4 ("app/testpmd: add port configuration settings")
Fixes: 7741e4cf16c0 ("app/testpmd: VMDq and DCB updates")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
---
 app/test-pmd/testpmd.c | 18 ++++--------------
 app/test-pmd/testpmd.h |  1 -
 2 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index d4be23f..a076b1d 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -246,9 +246,6 @@ uint16_t mb_mempool_cache = DEF_MBUF_CACHE; /**< Size of mbuf mempool cache. */
 /* current configuration is in DCB or not,0 means it is not in DCB mode */
 uint8_t dcb_config = 0;
 
-/* Whether the dcb is in testing status */
-uint8_t dcb_test = 0;
-
 /*
  * Configurable number of RX/TX queues.
  */
@@ -2167,8 +2164,7 @@ start_packet_forwarding(int with_tx_first)
 		return;
 	}
 
-
-	if(dcb_test) {
+	if (dcb_config) {
 		for (i = 0; i < nb_fwd_ports; i++) {
 			pt_id = fwd_ports_ids[i];
 			port = &ports[pt_id];
@@ -2476,8 +2472,6 @@ start_port(portid_t pid)
 	if (port_id_is_invalid(pid, ENABLED_WARN))
 		return 0;
 
-	if(dcb_config)
-		dcb_test = 1;
 	RTE_ETH_FOREACH_DEV(pi) {
 		if (pid != pi && pid != (portid_t)RTE_PORT_ALL)
 			continue;
@@ -2717,11 +2711,6 @@ stop_port(portid_t pid)
 	portid_t peer_pl[RTE_MAX_ETHPORTS];
 	int peer_pi;
 
-	if (dcb_test) {
-		dcb_test = 0;
-		dcb_config = 0;
-	}
-
 	if (port_id_is_invalid(pid, ENABLED_WARN))
 		return;
 
@@ -3625,8 +3614,6 @@ init_port_dcb_config(portid_t pid,
 	rte_port = &ports[pid];
 
 	memset(&port_conf, 0, sizeof(struct rte_eth_conf));
-	/* Enter DCB configuration status */
-	dcb_config = 1;
 
 	port_conf.rxmode = rte_port->dev_conf.rxmode;
 	port_conf.txmode = rte_port->dev_conf.txmode;
@@ -3694,6 +3681,9 @@ init_port_dcb_config(portid_t pid,
 
 	rte_port->dcb_flag = 1;
 
+	/* Enter DCB configuration status */
+	dcb_config = 1;
+
 	return 0;
 }
 
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 9530ec5..432c66d 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -425,7 +425,6 @@ extern uint64_t noisy_lkup_num_reads;
 extern uint64_t noisy_lkup_num_reads_writes;
 
 extern uint8_t dcb_config;
-extern uint8_t dcb_test;
 
 extern uint32_t mbuf_data_size_n;
 extern uint16_t mbuf_data_size[MAX_SEGS_BUFFER_SPLIT];
-- 
2.7.4

[dpdk-stable] [PATCH V3 3/7] app/testpmd: fix a segment fault when DCB test

[Huisong Li]

After DCB mode is configured, if we decrease the number of RX and TX
queues, fwd_config_setup() will be called to setup the DCB forwarding
configuration. And forwarding streams are updated based on new queue
numbers in fwd_config_setup(), but the mapping between the TC and
queues obtained by rte_eth_dev_get_dcb_info() is still old queue
numbers (old queue numbers are greater than new queue numbers).
In this case, the segment fault happens. So rte_eth_dev_configure()
should be called again to update the mapping between the TC and
queues before rte_eth_dev_get_dcb_info().

Like:
set nbcore 4
port stop all
port config 0 dcb vt off 4 pfc on
port start all
port stop all
port config all rxq 8
port config all txq 8

Fixes: 900550de04a7 ("app/testpmd: add dcb support")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
---
 app/test-pmd/config.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 03ee40c..18b197b 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -2996,7 +2996,33 @@ dcb_fwd_config_setup(void)
 	uint16_t nb_rx_queue, nb_tx_queue;
 	uint16_t i, j, k, sm_id = 0;
 	uint16_t total_tc_num;
+	struct rte_port *port;
 	uint8_t tc = 0;
+	portid_t pid;
+	int ret;
+
+	/*
+	 * The fwd_config_setup() is called when the port is RTE_PORT_STARTED
+	 * RTE_PORT_STOPPED. When a port is RTE_PORT_STARTED, dev_configure
+	 * cannot be called.
+	 *
+	 * re-configure the device after changing queue numbers of stopped
+	 * ports, so that the updated mapping between tc and queue can be
+	 * obtained.
+	 */
+	for (pid = 0; pid < nb_fwd_ports; pid++) {
+		if (port_is_started(pid) == 1)
+			continue;
+
+		port = &ports[pid];
+		ret = rte_eth_dev_configure(pid, nb_rxq, nb_txq,
+					    &port->dev_conf);
+		if (ret < 0) {
+			printf("Failed to re-configure port %d, ret = %d.\n",
+				pid, ret);
+			return;
+		}
+	}
 
 	cur_fwd_config.nb_fwd_lcores = (lcoreid_t) nb_fwd_lcores;
 	cur_fwd_config.nb_fwd_ports = nb_fwd_ports;
-- 
2.7.4