linux-kernel - [PATCH net-next 11/14] net: bcmgenet: support reclaiming unsent Tx packets

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Message-Id: <20250306192643.2383632-12-opendmb@gmail.com>
Date: Thu,  6 Mar 2025 11:26:39 -0800
From: Doug Berger <opendmb@...il.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Doug Berger <opendmb@...il.com>
Subject: [PATCH net-next 11/14] net: bcmgenet: support reclaiming unsent Tx packets

When disabling the transmitter any outstanding packets can now
be reclaimed by bcmgenet_tx_reclaim_all() rather than by the
bcmgenet_fini_dma() function.

Signed-off-by: Doug Berger <opendmb@...il.com>
---
 .../net/ethernet/broadcom/genet/bcmgenet.c    | 37 +++++++++++++++----
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 38943bbc35b1..0706c9635689 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1903,12 +1903,39 @@ static unsigned int __bcmgenet_tx_reclaim(struct net_device *dev,
 }
 
 static unsigned int bcmgenet_tx_reclaim(struct net_device *dev,
-				struct bcmgenet_tx_ring *ring)
+				struct bcmgenet_tx_ring *ring,
+				bool all)
 {
-	unsigned int released;
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+	struct device *kdev = &priv->pdev->dev;
+	unsigned int released, drop, wr_ptr;
+	struct enet_cb *cb_ptr;
+	struct sk_buff *skb;
 
 	spin_lock_bh(&ring->lock);
 	released = __bcmgenet_tx_reclaim(dev, ring);
+	if (all) {
+		skb = NULL;
+		drop = (ring->prod_index - ring->c_index) & DMA_C_INDEX_MASK;
+		released += drop;
+		ring->prod_index = ring->c_index & DMA_C_INDEX_MASK;
+		while (drop--) {
+			cb_ptr = bcmgenet_put_txcb(priv, ring);
+			skb = cb_ptr->skb;
+			bcmgenet_free_tx_cb(kdev, cb_ptr);
+			if (skb && cb_ptr == GENET_CB(skb)->first_cb) {
+				dev_consume_skb_any(skb);
+				skb = NULL;
+			}
+		}
+		if (skb)
+			dev_consume_skb_any(skb);
+		bcmgenet_tdma_ring_writel(priv, ring->index,
+					  ring->prod_index, TDMA_PROD_INDEX);
+		wr_ptr = ring->write_ptr * WORDS_PER_BD(priv);
+		bcmgenet_tdma_ring_writel(priv, ring->index, wr_ptr,
+					  TDMA_WRITE_PTR);
+	}
 	spin_unlock_bh(&ring->lock);
 
 	return released;
@@ -1945,7 +1972,7 @@ static void bcmgenet_tx_reclaim_all(struct net_device *dev)
 	int i = 0;
 
 	do {
-		bcmgenet_tx_reclaim(dev, &priv->tx_rings[i++]);
+		bcmgenet_tx_reclaim(dev, &priv->tx_rings[i++], true);
 	} while (i <= priv->hw_params->tx_queues && netif_is_multiqueue(dev));
 }
 
@@ -2921,10 +2948,6 @@ static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
 	bcmgenet_fini_rx_napi(priv);
 	bcmgenet_fini_tx_napi(priv);
 
-	for (i = 0; i < priv->num_tx_bds; i++)
-		dev_kfree_skb(bcmgenet_free_tx_cb(&priv->pdev->dev,
-						  priv->tx_cbs + i));
-
 	for (i = 0; i <= priv->hw_params->tx_queues; i++) {
 		txq = netdev_get_tx_queue(priv->dev, i);
 		netdev_tx_reset_queue(txq);
-- 
2.34.1