netdev - [PATCH] net: broadcom: bcm4908_enet: report queued and transmitted bytes

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Date:   Wed, 26 Oct 2022 16:26:24 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH] net: broadcom: bcm4908_enet: report queued and transmitted bytes

From: Rafał Miłecki <rafal@...ecki.pl>

This allows BQL to operate avoiding buffer bloat and reducing latency.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 drivers/net/ethernet/broadcom/bcm4908_enet.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c
index 93ccf549e2ed..e672a9ef4444 100644
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -495,6 +495,7 @@ static int bcm4908_enet_stop(struct net_device *netdev)
 	netif_carrier_off(netdev);
 	napi_disable(&rx_ring->napi);
 	napi_disable(&tx_ring->napi);
+	netdev_reset_queue(netdev);
 
 	bcm4908_enet_dma_rx_ring_disable(enet, &enet->rx_ring);
 	bcm4908_enet_dma_tx_ring_disable(enet, &enet->tx_ring);
@@ -564,6 +565,8 @@ static netdev_tx_t bcm4908_enet_start_xmit(struct sk_buff *skb, struct net_devic
 	enet->netdev->stats.tx_bytes += skb->len;
 	enet->netdev->stats.tx_packets++;
 
+	netdev_sent_queue(enet->netdev, skb->len);
+
 	return NETDEV_TX_OK;
 }
 
@@ -635,6 +638,7 @@ static int bcm4908_enet_poll_tx(struct napi_struct *napi, int weight)
 	struct bcm4908_enet_dma_ring_bd *buf_desc;
 	struct bcm4908_enet_dma_ring_slot *slot;
 	struct device *dev = enet->dev;
+	unsigned int bytes = 0;
 	int handled = 0;
 
 	while (handled < weight && tx_ring->read_idx != tx_ring->write_idx) {
@@ -645,6 +649,7 @@ static int bcm4908_enet_poll_tx(struct napi_struct *napi, int weight)
 
 		dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE);
 		dev_kfree_skb(slot->skb);
+		bytes += slot->len;
 		if (++tx_ring->read_idx == tx_ring->length)
 			tx_ring->read_idx = 0;
 
@@ -656,6 +661,8 @@ static int bcm4908_enet_poll_tx(struct napi_struct *napi, int weight)
 		bcm4908_enet_dma_ring_intrs_on(enet, tx_ring);
 	}
 
+	netdev_completed_queue(enet->netdev, handled, bytes);
+
 	if (netif_queue_stopped(enet->netdev))
 		netif_wake_queue(enet->netdev);
 
-- 
2.34.1