[openwrt/openwrt] bcm4908: backport upstream BQL support for bcm4908_enet

[LEDE Commits]

rmilecki pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/1d12cfdce28101ca60fc7afed1e4cf0812814992

commit 1d12cfdce28101ca60fc7afed1e4cf0812814992
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Thu Oct 27 22:33:14 2022 +0200

    bcm4908: backport upstream BQL support for bcm4908_enet
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
    (cherry picked from commit ae57770c956888337249688b9a16c25dd4fd63fb)
    (cherry picked from commit 6198eb3e6448e9a43a32d3f46b7d0543424f455b)
---
 ...m-bcm4908_enet-report-queued-and-transmit.patch | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/target/linux/bcm4908/patches-5.4/079-v6.2-0002-net-broadcom-bcm4908_enet-report-queued-and-transmit.patch b/target/linux/bcm4908/patches-5.4/079-v6.2-0002-net-broadcom-bcm4908_enet-report-queued-and-transmit.patch
new file mode 100644
index 0000000000..9f85a77b76
--- /dev/null
+++ b/target/linux/bcm4908/patches-5.4/079-v6.2-0002-net-broadcom-bcm4908_enet-report-queued-and-transmit.patch
@@ -0,0 +1,45 @@
+From 471ef777ec79baadc5cd9773d08f95f49cf5e2b1 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Date: Mon, 31 Oct 2022 11:48:56 +0100
+Subject: [PATCH] net: broadcom: bcm4908_enet: report queued and transmitted
+ bytes
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This allows BQL to operate avoiding buffer bloat and reducing latency.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+Link: https://lore.kernel.org/r/20221031104856.32388-1-zajec5@gmail.com
+Signed-off-by: Jakub Kicinski <kuba at kernel.org>
+---
+ drivers/net/ethernet/broadcom/bcm4908_enet.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
++++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
+@@ -504,6 +504,7 @@ static int bcm4908_enet_stop(struct net_
+ 	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);
+@@ -563,6 +564,8 @@ static int bcm4908_enet_start_xmit(struc
+ 	if (ring->write_idx + 1 == ring->length - 1)
+ 		tmp |= DMA_CTL_STATUS_WRAP;
+ 
++	netdev_sent_queue(enet->netdev, skb->len);
++
+ 	buf_desc->addr = cpu_to_le32((uint32_t)slot->dma_addr);
+ 	buf_desc->ctl = cpu_to_le32(tmp);
+ 
+@@ -670,6 +673,7 @@ static int bcm4908_enet_poll_tx(struct n
+ 			tx_ring->read_idx = 0;
+ 	}
+ 
++	netdev_completed_queue(enet->netdev, handled, bytes);
+ 	enet->netdev->stats.tx_packets += handled;
+ 	enet->netdev->stats.tx_bytes += bytes;
+