[dpdk-stable] [PATCH v4] net/i40e: fix incorrect hash look up table

[Shougang Wang]

The hash look up table (LUT) is managed by global register but it is not
initialized when RSS is disabled. Once user wants to enable RSS during
runtime, the LUT will not be initialized.
This patch fixes the issue by initializing the LUT whether RSS enabled
or not.

Fixes: feaae285b342 ("net/i40e: support hash configuration in RSS flow")
Cc: stable at dpdk.org

Signed-off-by: Shougang Wang <shougangx.wang at intel.com>
---
v4:
-Updated code.
---
 drivers/net/i40e/i40e_ethdev.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 05d5f2861..0a3f5e3c1 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -8985,6 +8985,7 @@ static int
 i40e_pf_config_rss(struct i40e_pf *pf)
 {
 	struct i40e_hw *hw = I40E_PF_TO_HW(pf);
+	enum rte_eth_rx_mq_mode mq_mode = pf->dev_data->dev_conf.rxmode.mq_mode;
 	struct rte_eth_rss_conf rss_conf;
 	uint32_t i, lut = 0;
 	uint16_t j, num;
@@ -9022,7 +9023,8 @@ i40e_pf_config_rss(struct i40e_pf *pf)
 	}
 
 	rss_conf = pf->dev_data->dev_conf.rx_adv_conf.rss_conf;
-	if ((rss_conf.rss_hf & pf->adapter->flow_types_mask) == 0) {
+	if ((rss_conf.rss_hf & pf->adapter->flow_types_mask) == 0 ||
+	    !(mq_mode & ETH_MQ_RX_RSS_FLAG)) {
 		i40e_pf_disable_rss(pf);
 		return 0;
 	}
@@ -9198,16 +9200,7 @@ i40e_tunnel_filter_handle(struct rte_eth_dev *dev,
 static int
 i40e_pf_config_mq_rx(struct i40e_pf *pf)
 {
-	int ret = 0;
-	enum rte_eth_rx_mq_mode mq_mode = pf->dev_data->dev_conf.rxmode.mq_mode;
-
-	/* RSS setup */
-	if (mq_mode & ETH_MQ_RX_RSS_FLAG)
-		ret = i40e_pf_config_rss(pf);
-	else
-		i40e_pf_disable_rss(pf);
-
-	return ret;
+	return i40e_pf_config_rss(pf);
 }
 
 /* Get the symmetric hash enable configurations per port */
-- 
2.17.1