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From fc2a68dea3c04061fa6f237dac63e7a8cdc7c1e4 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Wed, 20 Jan 2016 17:50:09 +0000
Subject: [PATCH] smsx95xx: Add option to disable the crimes against truesize
fix
It may improve iperf numbers on Pi 1, but may generate dmesg warnings and possibly cause network issues
See issue 1248.
---
drivers/net/usb/smsc95xx.c | 8 ++++++++
1 file changed, 8 insertions(+)
mode change 100755 => 100644 drivers/net/usb/smsc95xx.c
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -75,6 +75,10 @@ static bool turbo_mode = false;
module_param(turbo_mode, bool, 0644);
MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
+static bool truesize_mode = false;
+module_param(truesize_mode, bool, 0644);
+MODULE_PARM_DESC(truesize_mode, "Report larger truesize value");
+
static char *macaddr = ":";
module_param(macaddr, charp, 0);
MODULE_PARM_DESC(macaddr, "MAC address");
@@ -1841,6 +1845,8 @@ static int smsc95xx_rx_fixup(struct usbn
if (dev->net->features & NETIF_F_RXCSUM)
smsc95xx_rx_csum_offload(skb);
skb_trim(skb, skb->len - 4); /* remove fcs */
+ if (truesize_mode)
+ skb->truesize = size + sizeof(struct sk_buff);
return 1;
}
@@ -1858,6 +1864,8 @@ static int smsc95xx_rx_fixup(struct usbn
if (dev->net->features & NETIF_F_RXCSUM)
smsc95xx_rx_csum_offload(ax_skb);
skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
+ if (truesize_mode)
+ ax_skb->truesize = size + sizeof(struct sk_buff);
usbnet_skb_return(dev, ax_skb);
}
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