[PATCH 2/2] net/i40e: program default RSS RETA at port configure

[Ciara Loftus]

Currently the default RSS redirection table is only programmed
when the port is started, in `i40e_dev_rx_init()`. Between
`rte_eth_dev_configure()` and `rte_eth_dev_start()` the table holds a
stale value, so querying it with `rte_eth_dev_rss_reta_query()` reports
entries spread over the hardware default queue count instead of the
number of Rx queues the port was just configured with.

Program the default table in `i40e_dev_configure()`, where the Rx queue
count is already known, so a query before start reflects the configured
queues. VMDQ queue counts aren't known until queue setup, so that case is
still handled at start.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Cc: stable at dpdk.org

Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
---
 drivers/net/intel/i40e/i40e_ethdev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/intel/i40e/i40e_ethdev.c b/drivers/net/intel/i40e/i40e_ethdev.c
index 3de3423634..e84c9ea857 100644
--- a/drivers/net/intel/i40e/i40e_ethdev.c
+++ b/drivers/net/intel/i40e/i40e_ethdev.c
@@ -1995,6 +1995,13 @@ i40e_dev_configure(struct rte_eth_dev *dev)
 	/* A new configuration reverts the RETA to the driver default. */
 	pf->adapter->rss_reta_updated = 0;
 
+	/* Program the default RETA now while the Rx queue count is known, so that
+	 * a query before the port is started reflects the configured queues.
+	 */
+	ret = i40e_pf_reset_rss_reta(pf);
+	if (ret)
+		return ret;
+
 	ret = i40e_dev_init_vlan(dev);
 	if (ret < 0)
 		goto err;
-- 
2.43.0