From owner-freebsd-drivers@FreeBSD.ORG  Tue Dec  7 05:37:41 2010
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Date: Mon, 6 Dec 2010 22:10:48 -0700 (MST)
From: Dennis Glatting <freebsd@penx.com>
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Subject: Any work to update the RealTek Drivers?
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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@windriver.com>.  All rights reserved.

(snip)

         case RL_HWREV_8168CP:
          case RL_HWREV_8168D:
          case RL_HWREV_8168DP:
                  sc->rl_flags |= RL_FLAG_PHYWAKE | RL_FLAG_PAR |
                      RL_FLAG_DESCV2 | RL_FLAG_MACSTAT | RL_FLAG_CMDSTOP |
                      RL_FLAG_AUTOPAD;
                  /*
                   * 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;
                  break;