netdev - RE: [PATCH net v2] net: Generalize ndo_gso_check tondo_features

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Date:	Thu, 25 Dec 2014 03:29:59 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	Jesse Gross <jesse@...ira.com>, David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Joe Stringer <joestringer@...ira.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: RE: [PATCH net v2] net: Generalize ndo_gso_check tondo_features_check

 Jesse Gross [mailto:jesse@...ira.com] 
> Sent: Wednesday, December 24, 2014 2:37 PM
[...]
> GSO isn't the only offload feature with restrictions that
> potentially can't be expressed with the current features mechanism.
> Checksum is another although it's a general issue that could in
> theory apply to anything. Even if it may be possible to
> implement these restrictions in other ways, it can result in
> duplicate code or inefficient per-packet behavior.
> 
> This generalizes ndo_gso_check so that drivers can remove any
> features that don't make sense for a given packet, similar to
> netif_skb_features(). It also converts existing driver
> restrictions to the new format, completing the work that was
> done to support tunnel protocols since the issues apply to
> checksums as well.
> 
> By actually removing features from the set that are used to do
> offloading, it solves another problem with the existing
> interface. In these cases, GSO would run with the original set
> of features and not do anything because it appears that
> segmentation is not required.
> 
> CC: Tom Herbert <therbert@...gle.com>
> CC: Joe Stringer <joestringer@...ira.com>
> CC: Eric Dumazet <edumazet@...gle.com>
> CC: Hayes Wang <hayeswang@...ltek.com>
> Signed-off-by: Jesse Gross <jesse@...ira.com>
> Acked-by:  Tom Herbert <therbert@...gle.com>
> Fixes: 04ffcb255f22 ("net: Add ndo_gso_check")
> ---
> v2: Rebase
>     Drop overzealous use of netdev_intersect_features()

Tested-by: Hayes Wang <hayeswang@...ltek.com>
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