[PATCH net-next v3 5/7] bnxt_en: Reinit IRQ when configuring LRO/GRO/HDS

[Michael Chan <michael.chan@broadcom.com>]

When configuring LRO/GRO/HDS, a new set of RX Aggregation rings may be
required.  It is possible that the FW cannot grant the desired number
of Agg rings, causing the driver to reduce the number of ethtool
channels to adjust.  This means that the number of IRQs/NAPIs may
change and we must set irq_re_init to true to make that work.  Without
this patch, when the driver is eventually shutdown, some memory for the
unused NAPIs may never be freed properly if the rings have shrunk.

Fixes: 87c8f8496a05 ("bnxt_en: add support for tcp-data-split ethtool command")
Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.")
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 11 ++++++++---
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 10 ++++++++--
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 05e609adf6a3..2ada2bb8fd57 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -14115,10 +14115,11 @@ static int bnxt_set_features(struct net_device *dev, netdev_features_t features)
 {
 	bool update_tpa = false, update_ntuple = false;
 	struct bnxt *bp = netdev_priv(dev);
+	bool irq_re_init = false;
 	u32 flags = bp->flags;
+	bool re_init = false;
 	u32 changes;
 	int rc = 0;
-	bool re_init = false;
 
 	bp->tx_wake_thresh = max_t(int, bp->tx_ring_size / 2,
 				   bnxt_min_tx_desc_cnt(bp, features));
@@ -14145,8 +14146,12 @@ static int bnxt_set_features(struct net_device *dev, netdev_features_t features)
 		update_tpa = true;
 		if ((bp->flags & BNXT_FLAG_TPA) == 0 ||
 		    (flags & BNXT_FLAG_TPA) == 0 ||
-		    (bp->flags & BNXT_FLAG_CHIP_P5_PLUS))
+		    (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)) {
 			re_init = true;
+			if (!(bp->flags & BNXT_FLAG_AGG_RINGS) &&
+			    (flags & BNXT_FLAG_AGG_RINGS))
+				irq_re_init = true;
+		}
 	}
 
 	if (changes & ~BNXT_FLAG_TPA)
@@ -14169,7 +14174,7 @@ static int bnxt_set_features(struct net_device *dev, netdev_features_t features)
 			return bnxt_reinit_features(bp, true, false, flags, update_tpa);
 
 		if (re_init)
-			return bnxt_reinit_features(bp, false, false, flags, update_tpa);
+			return bnxt_reinit_features(bp, irq_re_init, false, flags, update_tpa);
 
 		if (update_tpa) {
 			bp->flags = flags;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 622e89587e5d..5c9e770960e6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -853,6 +853,7 @@ static int bnxt_set_ringparam(struct net_device *dev,
 {
 	u8 tcp_data_split = kernel_ering->tcp_data_split;
 	struct bnxt *bp = netdev_priv(dev);
+	bool irq_re_init = false;
 	u8 hds_config_mod;
 	int rc;
 
@@ -876,8 +877,13 @@ static int bnxt_set_ringparam(struct net_device *dev,
 		return -EINVAL;
 	}
 
+	if (hds_config_mod &&
+	    tcp_data_split == ETHTOOL_TCP_DATA_SPLIT_ENABLED &&
+	    !(bp->flags & BNXT_FLAG_AGG_RINGS))
+		irq_re_init = true;
+
 	if (netif_running(dev))
-		bnxt_close_nic(bp, false, false);
+		bnxt_close_nic(bp, irq_re_init, false);
 
 	if (hds_config_mod) {
 		if (tcp_data_split == ETHTOOL_TCP_DATA_SPLIT_ENABLED)
@@ -891,7 +897,7 @@ static int bnxt_set_ringparam(struct net_device *dev,
 	bnxt_set_ring_params(bp);
 
 	if (netif_running(dev)) {
-		rc = bnxt_open_nic(bp, false, false);
+		rc = bnxt_open_nic(bp, irq_re_init, false);
 		if (rc)
 			return rc;
 	}
-- 
2.51.0