netdev - Re: [PATCH net-next v4 0/7] switchdev offload flags

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Message-ID: <54CBE033.4010501@cumulusnetworks.com>
Date:	Fri, 30 Jan 2015 11:49:07 -0800
From:	roopa <roopa@...ulusnetworks.com>
To:	Jiri Pirko <jiri@...nulli.us>
CC:	sfeldma@...il.com, jhs@...atatu.com, bcrl@...ck.org, tgraf@...g.ch,
	john.fastabend@...il.com, stephen@...workplumber.org,
	vyasevic@...hat.com, ronen.arad@...el.com, netdev@...r.kernel.org,
	davem@...emloft.net, shm@...ulusnetworks.com,
	gospo@...ulusnetworks.com
Subject: Re: [PATCH net-next v4 0/7] switchdev offload flags

On 1/30/15, 8:59 AM, Jiri Pirko wrote:
> Fri, Jan 30, 2015 at 07:40:10AM CET, roopa@...ulusnetworks.com wrote:
>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>
>> This patch series introduces new offload flags for switchdev.
>> Kernel network subsystems can use this flag to accelerate
>> network functions by offloading to hw.
>>
>> I expect that there will be need for subsystem specific feature
>> flag in the future.
>>
>> This patch series currently only addresses bridge driver link
>> attribute offloads to hardware.
>>
>> Looking at the current state of bridge l2 offload in the kernel,
>>     - flag 'self' is the way to directly manage the bridge device in hw via
>>       the ndo_bridge_setlink/ndo_bridge_getlink calls
>>
>>     - flag 'master' is always used to manage the in kernel bridge devices
>>       via the same ndo_bridge_setlink/ndo_bridge_getlink calls
>>
>> Today these are used separately. The nic offloads use hwmode "vepa/veb" to go
>> directly to hw with the "self" flag.
>>
>> At this point i am trying not to introduce any new user facing flags/attributes.
>> In the model where we want the kernel bridging to be accelerated with
>> hardware, we very much want the bridge driver to be involved.
>>
>> In this proposal,
>> - The offload flag/bit helps switch asic drivers to indicate that they
>>   accelerate the kernel networking objects/functions
>> - The user does not have to specify a new flag to do so. A bridge created with
>>   switch asic ports will be accelerated if the switch driver supports it.
>> - The user can continue to directly manage l2 in nics (ixgbe) using the
>>   existing hwmode/self flags
>> - It also does not stop users from using the 'self' flag to talk to the
>>   switch asic driver directly
>> - Involving the bridge driver makes sure the add/del notifications to user
>>   space go out after both kernel and hardware are programmed
>>
>> (To selectively offload bridge port attributes,
>> example learning in hw only etc, we can introduce offload bits for
>> per bridge port flag attribute as in my previous patch
>> https://patchwork.ozlabs.org/patch/413211/. I have not included that in this
>> series)
>>
>> v2
>>    - try a different name for the offload flag/bit
>>    - tries to solve the stacked netdev case by traversing the lowerdev
>>      list to reach the switch port
>>
>> v3 -
>>     - Tested with bond as bridge port for the stacked device case.
>>       Includes a bond_fix_features change to not ignore the
>>       NETIF_F_HW_NETFUNC_OFFLOAD flag
>>     - Some checkpatch fixes
>>
>> v4 -
>>     - rename flag to NETIF_F_HW_SWITCH_OFFLOAD
>>     - add ndo_bridge_setlink/dellink handlers in bond and team drivers as
>>       suggested by jiri.
>>     - introduce default ndo_dflt_netdev_switch_port_bridge_setlink/dellink
>>     handlers that masters can use to call offload api on lowerdevs.
>>
>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>
> Having a flu and being completely unusable, I gave this patchset a quick
> peek and looks allright. I will review once I recover (Sun/Mon).
> Not sure if Dave wants to hold the patchset until then.
>
>
ok sounds good,  thanks, hope you feel better soon.
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