netdev - Re: [net-next 05/19] ixgbe: Add support for UDP-encapsulated tx checksum offload

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Date:	Wed, 2 Sep 2015 16:46:42 +0000
From:	"Rustad, Mark D" <mark.d.rustad@...el.com>
To:	Tom Herbert <tom@...bertland.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"jogreene@...hat.com" <jogreene@...hat.com>
Subject: Re: [net-next 05/19] ixgbe: Add support for UDP-encapsulated tx
 checksum offload

> On Sep 1, 2015, at 8:17 PM, Tom Herbert <tom@...bertland.com> wrote:
> 
> I suspect this is not UDP-encapsulation specific, will it work with
> TCP/IP/IP, TCP/IP/GRE etc.?

It could do more, but this is what has been tested up to this point.

> Isn't there anyway the ixgbe could just be made to NETIF_HW_CSUM? That
> would be so much more straightforward and support nearly all use cases
> without needing to jump through all these hoops.

Well, the description says:

 ---
Note: NETIF_F_HW_CSUM is a superset of NETIF_F_IP_CSUM + NETIF_F_IPV6_CSUM.
It means that device can fill TCP/UDP-like checksum anywhere in the packets
whatever headers there might be.
 ---

The device can't do whatever, wherever. There is always a limit to the offset to the inner headers that can be handled, for instance.

--
Mark Rustad, Networking Division, Intel Corporation


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