[dpdk-dev] [PATCH V4 1/7] app/testpmd: fix forward lcores number when DCB test

[Huisong Li <lihuisong@huawei.com>]

For the DCB forwarding test, each core is assigned to each traffic class.
Number of forwarding cores for DCB test must be equal or less than number
of total TC. Otherwise, the following problems may occur:
1/ Redundant polling threads will be created when forwarding cores number
   is greater than total TC number.
2/ Two cores would try to use a same queue on a port when Rx/Tx queue
   number is greater than the used TC number, which is not allowed.

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 a4445a7..39c0b80 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -3008,6 +3008,21 @@ 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.
  *
@@ -3027,12 +3042,16 @@ 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