Re: nfe driver 6.2 stable

On Mon, Sep 24, 2007 at 05:17:40PM +0100, Chris wrote:
On 24/09/2007, Jeremy Chadwick <koitsu@xxxxxxxxxxx> wrote:
On Mon, Sep 24, 2007 at 12:57:23AM +0100, Chris wrote:
nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=8<VLAN_MTU>
inet x.x.x.x netmask 0xffffff00 broadcast x.x.x.x
inet x.x.x.x netmask 0xffffffff broadcast x.x.x.x
ether x
media: Ethernet autoselect (1000baseTX <full-duplex>)
status: active

1 - is there a man page for nfe anywhere?

Closest thing I can find would be the manpage from -CURRENT's nfe(4),
which is supposedly the same code.

http://www.freebsd.org/cgi/man.cgi?query=nfe&apropos=0&sektion=0&manpath=FreeBSD+7-current&format=html

2 - does it support hardware checksum I remember reading it does but
from ifconfig output it appears to not be in use so if it does support
it how do I enable it?

It does support it, but I don't know the circumstances surrounding when
it gets enabled. That is to say, it's known that some versions of the
chip (and/or associated PHY) have bugs, so possibly hardware checksum
offloading is known to be broken on the system you're on. Taken from my
7-CURRENT box at home (Asus A8N-E, nForce 4-based):

nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=10b<RXCSUM,TXCSUM,VLAN_MTU,TSO4>
ether 00:15:f2:17:30:e9
inet 192.168.1.51 netmask 0xffffff00 broadcast 192.168.1.255
media: Ethernet 1000baseTX <full-duplex>
status: active

I do not explicitly specify rxcsum or txcsum in my rc.conf ifconfig
line.

3 - same with TOS?

TOS (type-of-service) or TSO? If TSO, see above ifconfig.

4 - how do I enable jumbo frames if it supports it?

You should take a bit more itme to read the webpage you obtained the
driver from. I see these on the page:

2007/01/06 Added jumbo frame support. [...] Fixed a bug to handle
Tx/Rx checksum offload settings with ifconfig.
2006/08/11 Added support for jumbo frame capability.

yongari@ (Pyun YongHyeon) should be able to provide additional help
with both.

5 - is it safe to use with zero copy sockets?

No idea.

6 - I currently have both net.isr.direct and mpsafenet disabled is
this driver safe to use on them?

No idea.

--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |



Ok to recap I have nforce 430 MCP13

I checked the src and current and 6.2-stable driver I am using are the
same version number but my driver src has this added above tunables.

/* definitions for backporting RELENG-6 */
#ifndef IFCAP_TSO4
#define IFCAP_TSO4 0
#define CSUM_TSO 0
#endif
#ifndef VLAN_CAPABILITIES
#define VLAN_CAPABILITIES(x)
#endif
#ifndef IFCAP_VLAN_HWCSUM
#define IFCAP_VLAN_HWCSUM 0
#endif

I am guessing If I set the values to 1 I get the features but would
like someone to confirm this for me before I try it thanks. I only
have remote access so if it stops the card working I lose access to
the box.


Do you have strong evidence that nForce 430(MCP13, aka MCP51) supports
hardware checksum offload? AFAIK MCP13 does NOT have support checksum
offload/jumbo frame as well as TSO.

If you want to experiment checksum offload capability of MCP13
hardware replace the following line in nfe_attach().

From:
case PCI_PRODUCT_NVIDIA_MCP51_LAN1:
case PCI_PRODUCT_NVIDIA_MCP51_LAN2:
sc->nfe_flags |= NFE_40BIT_ADDR | NFE_PWR_MGMT;
break;

To:
case PCI_PRODUCT_NVIDIA_MCP51_LAN1:
case PCI_PRODUCT_NVIDIA_MCP51_LAN2:
sc->nfe_flags |= NFE_40BIT_ADDR | NFE_PWR_MGMT | NFE_HW_CSUM;
^^^^^^^^^^^^^^
break;

--
Regards,
Pyun YongHyeon
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