[PATCH v4] app/testpmd: fix secondary process not forwarding

[Shiyang He <shiyangx.he@intel.com>]

Under multi-process scenario, the secondary process gets queue state
from the wrong location (the global variable 'ports'). Therefore, the
secondary process can not forward since "stream_init" is not called.

This commit fixes the issue by calling 'rte_eth_rx/tx_queue_info_get'
to get queue state from shared memory.

Fixes: 3c4426db54fc ("app/testpmd: do not poll stopped queues")
Cc: stable@dpdk.org

Signed-off-by: Shiyang He <shiyangx.he@intel.com>

v2: Add function return value processing
v3: Add return value description
v4: Update queue state in 'start_port()'
---
 app/test-pmd/testpmd.c | 72 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 71 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 0c14325b8d..aa2a7b68ca 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -2379,6 +2379,70 @@ launch_packet_forwarding(lcore_function_t *pkt_fwd_on_lcore)
 	}
 }
 
+static void
+update_rx_queue_state(uint16_t port_id, uint16_t queue_id)
+{
+	struct rte_eth_rxq_info rx_qinfo;
+	int32_t rc;
+
+	rc = rte_eth_rx_queue_info_get(port_id,
+			queue_id, &rx_qinfo);
+	if (rc == 0) {
+		ports[port_id].rxq[queue_id].state =
+			rx_qinfo.queue_state;
+	} else if (rc == -ENOTSUP) {
+		/*
+		 * Set the rxq state to RTE_ETH_QUEUE_STATE_STARTED
+		 * to ensure that the PMDs do not implement
+		 * rte_eth_rx_queue_info_get can forward.
+		 */
+		ports[port_id].rxq[queue_id].state =
+			RTE_ETH_QUEUE_STATE_STARTED;
+	} else {
+		TESTPMD_LOG(WARNING,
+			"Failed to get rx queue info\n");
+	}
+}
+
+static void
+update_tx_queue_state(uint16_t port_id, uint16_t queue_id)
+{
+	struct rte_eth_txq_info tx_qinfo;
+	int32_t rc;
+
+	rc = rte_eth_tx_queue_info_get(port_id,
+			queue_id, &tx_qinfo);
+	if (rc == 0) {
+		ports[port_id].txq[queue_id].state =
+			tx_qinfo.queue_state;
+	} else if (rc == -ENOTSUP) {
+		/*
+		 * Set the txq state to RTE_ETH_QUEUE_STATE_STARTED
+		 * to ensure that the PMDs do not implement
+		 * rte_eth_tx_queue_info_get can forward.
+		 */
+		ports[port_id].txq[queue_id].state =
+			RTE_ETH_QUEUE_STATE_STARTED;
+	} else {
+		TESTPMD_LOG(WARNING,
+			"Failed to get tx queue info\n");
+	}
+}
+
+static void
+update_queue_state(void)
+{
+	portid_t pi;
+	queueid_t qi;
+
+	RTE_ETH_FOREACH_DEV(pi) {
+		for (qi = 0; qi < nb_rxq; qi++)
+			update_rx_queue_state(pi, qi);
+		for (qi = 0; qi < nb_txq; qi++)
+			update_tx_queue_state(pi, qi);
+	}
+}
+
 /*
  * Launch packet forwarding configuration.
  */
@@ -2418,9 +2482,12 @@ start_packet_forwarding(int with_tx_first)
 	if (!pkt_fwd_shared_rxq_check())
 		return;
 
-	if (stream_init != NULL)
+	if (stream_init != NULL) {
+		if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+			update_queue_state();
 		for (i = 0; i < cur_fwd_config.nb_fwd_streams; i++)
 			stream_init(fwd_streams[i]);
+	}
 
 	port_fwd_begin = cur_fwd_config.fwd_eng->port_fwd_begin;
 	if (port_fwd_begin != NULL) {
@@ -3180,6 +3247,9 @@ start_port(portid_t pid)
 		pl[cfg_pi++] = pi;
 	}
 
+	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
+		update_queue_state();
+
 	if (at_least_one_port_successfully_started && !no_link_check)
 		check_all_ports_link_status(RTE_PORT_ALL);
 	else if (at_least_one_port_exist & all_ports_already_started)
-- 
2.37.2