examples/l3fwd-power: fix handling no Rx queue

If the number of rx queues is zero, it is meaningless to enable
rx interrupt. This patch fixes it.

Fixes: aee3bc79cc34 ("examples/l3fwd-power: enable one-shot Rx interrupt and polling switch")
Cc: stable@dpdk.org
Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>

diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c
index ec40a17..57636e9 100644 (file)
--- a/examples/l3fwd-power/main.c
+++ b/examples/l3fwd-power/main.c
@@ -1654,6 +1654,7 @@ main(int argc, char **argv)
        uint32_t n_tx_queue, nb_lcores;
        uint32_t dev_rxq_num, dev_txq_num;
        uint8_t portid, nb_rx_queue, queue, socketid;
+       uint16_t org_rxq_intr = port_conf.intr_conf.rxq;
 
        /* catch SIGINT and restore cpufreq governor to ondemand */
        signal(SIGINT, signal_exit_now);
@@ -1714,8 +1715,13 @@ main(int argc, char **argv)
                        n_tx_queue = dev_txq_num;
                printf("Creating queues: nb_rxq=%d nb_txq=%u... ",
                        nb_rx_queue, (unsigned)n_tx_queue );
+               /* If number of Rx queue is 0, no need to enable Rx interrupt */
+               if (nb_rx_queue == 0)
+                       port_conf.intr_conf.rxq = 0;
                ret = rte_eth_dev_configure(portid, nb_rx_queue,
                                        (uint16_t)n_tx_queue, &port_conf);
+               /* Revert to original value */
+               port_conf.intr_conf.rxq = org_rxq_intr;
                if (ret < 0)
                        rte_exit(EXIT_FAILURE, "Cannot configure device: "
                                        "err=%d, port=%d\n", ret, portid);