Re: [PATCH] s390: qeth network driver

Re: [PATCH] s390: qeth network driver

[Jeff Garzik]

Linux Kernel Mailing List wrote:
> ChangeSet 1.2072, 2005/02/03 17:04:37-08:00, schwidefsky@de.ibm.com
> 
> 	[PATCH] s390: qeth network driver
> 	
> 	From: Steffen Thoss <thoss@de.ibm.com>
> 	From: Frank Pavlic <pavlic@de.ibm.com>
> 	
> 	qeth network driver changes:
> 	 - Improve performance by omitting svs.
> 	 - Use function callback mechanism to set layer 2 parameters when getting
> 	   a reply for a Layer 2 command.
> 	 - dev->hard_header must not be NULL when fake_ll is no set since
> 	   IPv6 and Layer2 needs the default function set by network stack.
> 	 - ping6 works now when running in layer 2 mode.
> 	 - Save original dev->hard_header to restore it when the user doesn't
> 	   want to use fake_ll anymore.
> 	 - Fake ethernet header in outgoing packets. This currently works
> 	   only if qeth is compiled without ipv6 support.
> 	 - Add more debug information in case of failures in qeth_set_offline.
> 	 - Using fake_ll with HiperSockets devices results in misaligned
> 	   ip packets and thus no traffic over HiperSockets.
> 	 - Start qeth_remove_device only after the qeth recovery completed.
> 	
> 	Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
> 	Signed-off-by: Andrew Morton <akpm@osdl.org>
> 	Signed-off-by: Linus Torvalds <torvalds@osdl.org>


It would be nice if this stuff was CC'd to the network, and network 
driver maintainers.

Two immediate concerns I have are,

* saving and restoring dev->hard_header is more than a little bit of a hack

* overall, I'm not so sure IPv6 support should be conditionalized on 
anything but CONFIG_IPV6.  Though S/390 and qeth are certainly unusual 
cases, none of the other net drivers in the kernel require a special 
config option to enable IPv6 support.

	Jeff