Any work to update the RealTek Drivers?

Dennis Glatting freebsd at
Sun Dec 5 18:40:48 UTC 2010

Is there any work going on with the RealTek drivers? The RealTek devices I 
am using support a 9k MTU but the code limits the MTU to the default. Over 
gigabit, a larger MTU is desirable.

Specifically, on one of several machines I am using:

re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> port 
0xde00-0xdeff mem 0xfbcff000-0xfbcfffff,0xfbcf8000-0xfbcfbfff irq 16 at 
device 0.0 on pci7
re1: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> port 
0xce00-0xceff mem 0xfbaff000-0xfbafffff,0xfbaf8000-0xfbafbfff irq 17 at 
device 0.0 on pci8

Trying to set the MTU:

btw# ifconfig re1 mtu 4096
ifconfig: ioctl (set mtu): Invalid argument

Looking at the source sys/dev/re/if_re.c

  * Copyright (c) 1997, 1998-2003
  *      Bill Paul <wpaul at>.  All rights reserved.


        case RL_HWREV_8168CP:
         case RL_HWREV_8168D:
         case RL_HWREV_8168DP:
                 sc->rl_flags |= RL_FLAG_PHYWAKE | RL_FLAG_PAR |
                  * These controllers support jumbo frame but it seems
                  * that enabling it requires touching additional magic
                  * registers. Depending on MAC revisions some
                  * controllers need to disable checksum offload. So
                  * disable jumbo frame until I have better idea what
                  * it really requires to make it support.
                  * RTL8168C/CP : supports up to 6KB jumbo frame.
                  * RTL8111C/CP : supports up to 9KB jumbo frame.
                 sc->rl_flags |= RL_FLAG_NOJUMBO;

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