[dpdk-stable] [PATCH] net/octeontx2: fix unnecessary error interrupts

[Nithin Dabilpuram <nithind1988@gmail.com>]

From: Nithin Dabilpuram <ndabilpuram@marvell.com>

Disable CQ_DISABLED error interrupt in NIX_LF_ERR_INT
to fix spurious interrupts in event dev mode. Also skip
configuring RSS when RQ count is '0' because
RSS table initialization is done incorrectly due to
divide-by-zero error and it is leading to RQ_OOR error
in NIX_LF_ERR_INT.

Fixes: 83ce2880e22e ("net/octeontx2: support RSS")
Cc: vattunuru@marvell.com
Cc: stable@dpdk.org

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 drivers/net/octeontx2/otx2_ethdev_irq.c | 7 +++++--
 drivers/net/octeontx2/otx2_rss.c        | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/octeontx2/otx2_ethdev_irq.c b/drivers/net/octeontx2/otx2_ethdev_irq.c
index 96b848a..b121488 100644
--- a/drivers/net/octeontx2/otx2_ethdev_irq.c
+++ b/drivers/net/octeontx2/otx2_ethdev_irq.c
@@ -472,9 +472,12 @@ otx2_nix_err_intr_enb_dis(struct rte_eth_dev *eth_dev, bool enb)
 {
 	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
 
-	/* Enable all nix lf error interrupts except for RQ_DISABLED */
+	/* Enable all nix lf error interrupts except
+	 * RQ_DISABLED and CQ_DISABLED.
+	 */
 	if (enb)
-		otx2_write64(~BIT_ULL(11), dev->base + NIX_LF_ERR_INT_ENA_W1S);
+		otx2_write64(~(BIT_ULL(11) | BIT_ULL(24)),
+			     dev->base + NIX_LF_ERR_INT_ENA_W1S);
 	else
 		otx2_write64(~0ull, dev->base + NIX_LF_ERR_INT_ENA_W1C);
 }
diff --git a/drivers/net/octeontx2/otx2_rss.c b/drivers/net/octeontx2/otx2_rss.c
index a29441e..5e3f866 100644
--- a/drivers/net/octeontx2/otx2_rss.c
+++ b/drivers/net/octeontx2/otx2_rss.c
@@ -358,7 +358,7 @@ otx2_nix_rss_config(struct rte_eth_dev *eth_dev)
 	int rc;
 
 	/* Skip further configuration if selected mode is not RSS */
-	if (eth_dev->data->dev_conf.rxmode.mq_mode != ETH_MQ_RX_RSS)
+	if (eth_dev->data->dev_conf.rxmode.mq_mode != ETH_MQ_RX_RSS || !qcnt)
 		return 0;
 
 	/* Update default RSS key and cfg */
-- 
2.8.4