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Disabling 802.3x flow control

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Special Forums IP Networking Disabling 802.3x flow control
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Old 11-18-2006
Disabling 802.3x flow control
I have a server I would like to disable 802.3x flow control on. The host is Linux (CentOS 4.4 x86_64 w/ 2.6.9-42.0.3.EL kernel,) and I'm using the ns83820 driver for the ethernet interface in question.

I've tried looking at the driver parameters (modinfo ns83820) and using ethtool (ethtool -a eth0,) but neither exposes / supports any configurability for pause frames.

In my desperation, I've even resorted to fiddling with the driver source to flip it off, but don't understand enough c to make sure I'm not breaking something else in the process. In the kernel source at drivers/net/ns83820.c, I find the following snippet:
Code:
        /* Ramit : Enable async and sync pause frames */
        /* writel(0, dev->base + PCR); */
        writel((PCR_PS_MCAST | PCR_PS_DA | PCR_PSEN | PCR_FFLO_4K |
                PCR_FFHI_8K | PCR_STLO_4 | PCR_STHI_8 | PCR_PAUSE_CNT),
                dev->base + PCR);

I *think* I can just get rid of PCR_PAUSE_CNT without breaking something else (for example, I see MCAST in there, and I definitely want to retain multicast support.)

Any ideas or suggestions?
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LEARN ABOUT NETBSD

atu

ATU(4)							   BSD Kernel Interfaces Manual 						    ATU(4)

NAME

     atu -- Atmel at76c50x 802.11B wireless network interfaces

SYNOPSIS

     atu* at uhub? port ?

DESCRIPTION

     The atu driver provides support for wireless network adapters based around the Atmel at76c503, at76c503a, at76c505, and at76c505a USB
     chipsets.

     Supported features include 802.11 and 802.3 frames, power management, BSS, IBSS, ad-hoc, and host-based access point mode.

     The atu driver encapsulates all IP and ARP traffic as 802.11 frames, however it can receive either 802.11 or 802.3 frames.  Transmit speed is
     selectable between 1Mbps fixed, 2Mbps fixed, 2Mbps with auto fallback, 5.5Mbps, 8Mbps, or 11Mbps depending on your hardware.

     Four different radio chipsets are used along with the device, each requiring a different firmware.

     By default, the atu driver configures the card for BSS operation (aka infrastructure mode).  This mode requires the use of an access point
     (base station).

     For more information on configuring this device, see ifconfig(8).

     The following devices are among those supported by the atu driver:

	   Acer Peripherals AWL400
	   AcerP AWL-300
	   Aincomm AWU2000B
	   Atmel 2662W-V4
	   Atmel BW002
	   Atmel DWL-120
	   Atmel WL-1330
	   Belkin F5D6050
	   Geowave GW-US11S
	   Linksys WUSB11
	   Linksys WUSB11-V28
	   Ovislink AirLive
	   SMC 2662W-AR

SEE ALSO

     arp(4), ifmedia(4), intro(4), netintro(4), usb(4), ifconfig(8), wiconfig(8)

AUTHORS

     The atu driver was written by Daan Vreeken and ported to OpenBSD by Theo de Raadt and David Gwynne.  The OpenBSD driver was then ported to
     NetBSD by Jesse Off <joff@NetBSD.org>.

BSD
								 January 23, 2005							       BSD