netdev - Re: [PATCH] [NET] ethtool: Add LRO support

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Date:	Fri, 10 Aug 2007 09:24:27 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	davem@...emloft.net, netdev@...r.kernel.org, ossthema@...ibm.com
Subject: Re: [PATCH] [NET] ethtool: Add LRO support

Jeff Garzik wrote:
> Auke Kok wrote:
>> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
>> ---
>>
>>  include/linux/ethtool.h   |    8 +++++++
>>  include/linux/netdevice.h |    1 +
>>  net/core/ethtool.c        |   53 +++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 62 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
>> index 23ccea8..a97248e 100644
>> --- a/include/linux/ethtool.h
>> +++ b/include/linux/ethtool.h
>> @@ -272,6 +272,8 @@ u32 ethtool_op_get_tso(struct net_device *dev);
>>  int ethtool_op_set_tso(struct net_device *dev, u32 data);
>>  u32 ethtool_op_get_ufo(struct net_device *dev);
>>  int ethtool_op_set_ufo(struct net_device *dev, u32 data);
>> +u32 ethtool_op_get_lro(struct net_device *dev);
>> +int ethtool_op_set_lro(struct net_device *dev, u32 data);
> 
> I'm thinking we don't need to keep adding two function pointers for each 
> boolean choice.
> 
> I propose adding two operations:
> 
> get-flags:	return 32-bit (even on 64-bit platforms) flags bitmap
> set-flags:	set 32-bit flags bitmap
> 
> The 32 bits shall be divided as follows:
> 
> bits 0-23:	ETHTOOL_FLAG_xxx defined in linux/ethtool.h
> bits 24-31:	driver-specific boolean flags
> 
> The driver-specific flags are first enumerated by userland via an 
> ETHTOOL_GSTRINGS call, using new string set ETH_SS_FLAGS.  The first 
> string returned names the first driver-private flag (bit 24).  This also 
> indicates that driver-private bit 24 is a valid flag for this driver and 
> network interface.
> 
> The overall goal is to replace get-LRO/set-LRO operations with the 
> setting/clearing of ETH_FLAG_LRO, and as well, provide a more-scalable 
> ethtool interface.
> 
> I'll code this up, along with the associated generic helpers 
> (net/core/ethtool.c), if there are no objections.

absolutely not. While going over the flags in netdevice.h I can already see that 
the room for more flags is rapidly becoming smaller. Unfortunately we're stuck 
with the current flags for compatiblity :)

The above idea sounds good to me and should give that room.

Auke
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