From fc2a68dea3c04061fa6f237dac63e7a8cdc7c1e4 Mon Sep 17 00:00:00 2001 From: popcornmix 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); }