[RFC 3/3] net/idpf: adjust RSS LUT to exclude hairpin queue

[Junfeng Guo]

RSS should direct traffic only to the normal data Rx queues, so when
hairpin queue configured, RSS LUT should be adjusted to exclude
the hairpin queue.

Signed-off-by: Xiao Wang <xiao.w.w...@intel.com>
Signed-off-by: Junfeng Guo <junfeng....@intel.com>
---
 drivers/net/idpf/idpf_ethdev.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/idpf/idpf_ethdev.c b/drivers/net/idpf/idpf_ethdev.c
index aaca6f4202..fc9663d32e 100644
--- a/drivers/net/idpf/idpf_ethdev.c
+++ b/drivers/net/idpf/idpf_ethdev.c
@@ -625,9 +625,28 @@ idpf_config_rx_queues_irqs(struct rte_eth_dev *dev)
        return -1;
 }
 
+static int
+idpf_config_rss_lut(struct idpf_vport *vport, uint16_t nb_q)
+{
+       uint16_t lut_size = vport->rss_lut_size;
+       uint16_t i;
+       int ret;
+
+       for (i = 0; i < lut_size; i++)
+               vport->rss_lut[i] = i % nb_q;
+
+       ret = idpf_set_rss_lut(vport);
+       if (ret)
+               PMD_INIT_LOG(ERR, "Failed to configure RSS lut");
+
+       return ret;
+}
+
 static int
 idpf_start_queues(struct rte_eth_dev *dev)
 {
+       struct idpf_vport *vport = (struct idpf_vport *)dev->data->dev_private;
+       uint16_t nb_rxq = dev->data->nb_rx_queues;
        struct idpf_rx_queue *rxq;
        struct idpf_tx_queue *txq;
        int err = 0;
@@ -671,6 +690,11 @@ idpf_start_queues(struct rte_eth_dev *dev)
                }
        }
 
+       /* RSS only to the data queues */
+       rxq = dev->data->rx_queues[nb_rxq - 1];
+       if (nb_rxq > 1 && rxq && rxq->hairpin_q)
+               err = idpf_config_rss_lut(vport, nb_rxq - 1);
+
        return err;
 }
 
-- 
2.25.1