openwrt/target/linux/generic/backport-6.1/795-v6.6-10-eth-r8152-try-to-use-a-normal-budget.patch

From cf74eb5a5bc867258e7d0b0d1c3c4a60e1e3de2f Mon Sep 17 00:00:00 2001
From: Jakub Kicinski <kuba@kernel.org>
Date: Mon, 14 Aug 2023 08:35:21 -0700
Subject: [PATCH] eth: r8152: try to use a normal budget

Mario reports that loading r8152 on his system leads to a:

  netif_napi_add_weight() called with weight 256

warning getting printed. We don't have any solid data
on why such high budget was chosen, and it may cause
stalls in processing other softirqs and rt threads.
So try to switch back to the default (64) weight.

If this slows down someone's system we should investigate
which part of stopping starting the NAPI poll in this
driver are expensive.

Reported-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/all/0bfd445a-81f7-f702-08b0-bd5a72095e49@amd.com/
Acked-by: Hayes Wang <hayeswang@realtek.com>
Link: https://lore.kernel.org/r/20230814153521.2697982-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/usb/r8152.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -9784,8 +9784,7 @@ static int rtl8152_probe(struct usb_inte
 
 	usb_set_intfdata(intf, tp);
 
-	netif_napi_add_weight(netdev, &tp->napi, r8152_poll,
-			      tp->support_2500full ? 256 : 64);
+	netif_napi_add(netdev, &tp->napi, r8152_poll);
 
 	ret = register_netdev(netdev);
 	if (ret != 0) {