openwrt/target/linux/brcm2708/patches-4.14/950-0315-usb-gadget-ethernet-Re-enable-Jumbo-frames.patch

From 1810e953fd59ebb674c292a13eff8d56c88e1c7e Mon Sep 17 00:00:00 2001
From: John Greb <h3x4m3r0n@gmail.com>
Date: Sun, 6 May 2018 20:01:57 +0000
Subject: [PATCH 315/454] usb: gadget ethernet: Re-enable Jumbo frames.

Commit <eea52743eb5654ec6f52b0e8b4aefec952543697> upstream

Fixes: <b3e3893e1253> ("net: use core MTU range checking")
which patched only one of two functions used to setup the
USB Gadget Ethernet driver, causing a serious performance
regression in the ability to increase mtu size above 1500.

Signed-off-by: John Greb <h3x4m3r0n@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---
 drivers/usb/gadget/function/u_ether.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -850,6 +850,10 @@ struct net_device *gether_setup_name_def
 	net->ethtool_ops = &ops;
 	SET_NETDEV_DEVTYPE(net, &gadget_type);
 
+	/* MTU range: 14 - 15412 */
+	net->min_mtu = ETH_HLEN;
+	net->max_mtu = GETHER_MAX_ETH_FRAME_LEN;
+
 	return net;
 }
 EXPORT_SYMBOL_GPL(gether_setup_name_default);