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From 50340b55bb7af7c12259d3bce5da6ba969c58e00 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Wed, 4 Apr 2018 16:34:24 +0100
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Subject: [PATCH 265/454] net: lan78xx: Allow for VLAN headers in timeout.
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The frame abort timeout being set by lan78xx_set_rx_max_frame_length
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didn't account for any VLAN headers, resulting in very low
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throughput if used with tagged VLANs.
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Use VLAN_ETH_HLEN instead of ETH_HLEN to correct for this.
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See https://github.com/raspberrypi/linux/issues/2458
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/net/usb/lan78xx.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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--- a/drivers/net/usb/lan78xx.c
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+++ b/drivers/net/usb/lan78xx.c
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@@ -2196,7 +2196,7 @@ static int lan78xx_change_mtu(struct net
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if ((ll_mtu % dev->maxpacket) == 0)
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return -EDOM;
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- ret = lan78xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);
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+ ret = lan78xx_set_rx_max_frame_length(dev, new_mtu + VLAN_ETH_HLEN);
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netdev->mtu = new_mtu;
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@@ -2489,7 +2489,8 @@ static int lan78xx_reset(struct lan78xx_
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buf |= FCT_TX_CTL_EN_;
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ret = lan78xx_write_reg(dev, FCT_TX_CTL, buf);
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- ret = lan78xx_set_rx_max_frame_length(dev, dev->net->mtu + ETH_HLEN);
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+ ret = lan78xx_set_rx_max_frame_length(dev,
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+ dev->net->mtu + VLAN_ETH_HLEN);
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ret = lan78xx_read_reg(dev, MAC_RX, &buf);
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buf |= MAC_RX_RXEN_;
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