netdev - Re: [PATCH] net: enic: convert to hw

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Date:	Thu, 07 Apr 2011 14:55:11 -0700
From:	roprabhu <roprabhu@...co.com>
To:	Michał Mirosław 
	<mirq-linux@...e.qmqm.pl>
CC:	<netdev@...r.kernel.org>, Christian Benvenuti <benve@...co.com>,
	Vasanthy Kolluri <vkolluri@...co.com>,
	David Wang <dwang2@...co.com>
Subject: Re: [PATCH] net: enic: convert to hw_features


On 4/7/11 1:45 PM, "Michał Mirosław" <mirq-linux@...e.qmqm.pl> wrote:

> On Thu, Apr 07, 2011 at 12:52:45PM -0700, roprabhu wrote:
>> Thanks michal.
>> 
>> One small comment below,
>> 
>> On 4/7/11 5:43 AM, "Michał Mirosław" <mirq-linux@...e.qmqm.pl> wrote:
>>> As the driver uses GRO and not LRO, LRO settings are ignored anyway
>>> and are removed here to avoid confusion.
> [...]
>>> diff --git a/drivers/net/enic/enic_res.c b/drivers/net/enic/enic_res.c
>>> index f111a37..6e5c635 100644
>>> --- a/drivers/net/enic/enic_res.c
>>> +++ b/drivers/net/enic/enic_res.c
>>> @@ -98,9 +98,9 @@ int enic_get_vnic_config(struct enic *enic)
>>> "vNIC MAC addr %pM wq/rq %d/%d mtu %d\n",
>>> enic->mac_addr, c->wq_desc_count, c->rq_desc_count, c->mtu);
>>> dev_info(enic_get_dev(enic), "vNIC csum tx/rx %d/%d "
>>> -  "tso/lro %d/%d intr timer %d usec rss %d\n",
>>> +  "tso %d intr timer %d usec rss %d\n",
>>> ENIC_SETTING(enic, TXCSUM), ENIC_SETTING(enic, RXCSUM),
>>> -  ENIC_SETTING(enic, TSO), ENIC_SETTING(enic, LRO),
>>> +  ENIC_SETTING(enic, TSO),
>>> c->intr_timer_usec, ENIC_SETTING(enic, RSS));
>>>  
>> You are right about the driver using GRO and not LRO by default. But the
>> config entry from where enic gets this setting is still called LRO for
>> reasons out of the scope of the driver. Yes, I see that it can lead to
>> confusion. So, we will need to retain the ENIC_SETTING(enic, LRO) but fix
>> the name of that setting.  Thanks for pointing this out. We will fix this
>> and any other changes if required and resubmit.
> 
> I removed this part because now network core is always turning on GRO
> by default regardless of what driver sets in features at init time.
> That's on purpose, since GRO is purely a software feature.
> 
> OTOH, if you want to forcibly disable GRO when LRO is not set in enic's
> config, then you can do so in ndo_fix_features callback.
> 
Ok thanks michal. 

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