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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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iwi

iwi(7D) 							      Devices								   iwi(7D)

NAME

       iwi - Intel Pro. Wireless 802.11a/b/g IPW2200B/G IPW2915A/B/G Driver

DESCRIPTION

       The   iwi  802.11b/g   wireless	NIC  driver is a multi-threaded, loadable, clonable,  GLDv3-based STREAMS driver supporting  the Data Link
       Provider Interface, dlpi(7P), on Intel Pro Wireless 2200BG 2915ABG chipset-based wireless NIC's. Driver functions include controller   ini-
       tialization, wireless 802.11b  infrastructure network connection, WEP and frame transmit and receive.

DRIVER CONFIGURATION

       The iwi driver performs auto-negotiation to determine the data rate and mode. Supported 802.11b	data rates are 1, 2, 5.5 and 11 Mbits/sec.
       Supported 802.11g data rates are 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48 and 54 Mbits/sec.

       The iwi driver supports only BSS networks (also known as "ap" or "infrastructure" networks) and "open"(or "open-system") or "shared system"
       authentication.	Only  WEP  encryption  is  currently supported. You perform configuration and administration tasks using the dladm(1M) and
       wificonfig(1M) utilities.

FILES

       /dev/iwi*		Special character device.

       /kernel/drv/iwi		32-bit ELF kernel module (x86).

       /kernel/drv/amd64/iwi	64-bit ELF kernel module (x86).

ATTRIBUTES

       See attributes(5) for a description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |x86			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       dladm(1M), wificonfig(1M), attributes(5), gld(7D), dlpi(7P)

       ANSI/IEEE Std 802.11- Standard for Wireless LAN	Technology -- 1999

       IEEE Std 802.11a- Standard for Wireless LAN  Technology-Rev. A-- 2003

       IEEE Std 802.11b - Standard  for  Wireless  LAN	Technology-Rev. B -- 2003

       IEEE Std 802.11g- Standard for  Wireless  LAN  Technology  -Rev. G-- 2003

SunOS 5.11							    11 Mar 2007 							   iwi(7D)