From: Edward Cree <ecree@solarflare.com>
To: David Laight <David.Laight@ACULAB.COM>,
David Miller <davem@davemloft.net>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-net-drivers@solarflare.com"
<linux-net-drivers@solarflare.com>,
"Tom Herbert" <tom@herbertland.com>
Subject: Re: [PATCH v2 net-next 1/5] net: local checksum offload for encapsulation
Date: Thu, 7 Jan 2016 17:54:09 +0000 [thread overview]
Message-ID: <568EA641.1010906@solarflare.com> (raw)
In-Reply-To: <063D6719AE5E284EB5DD2968C1650D6D1CCBF46D@AcuExch.aculab.com>
On 07/01/16 17:22, David Laight wrote:
> Isn't it even simpler than that?
> The checksum of the inner packet (including its header) is ~0 (ie 0).
> So the checksum of the whole packet (for the outer header) is the same
> as that of the packet down to the start of the inner header.
Not quite. The inner pseudo-header is included in the inner checksum
calculation, but does not actually appear in the packet. Thus the checksum
of the inner packet is ~sum_of_inner_pseudo_header.
-ed
next prev parent reply other threads:[~2016-01-07 17:54 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-07 17:10 [PATCH v2 net-next 0/5] Local Checksum Offload Edward Cree
2016-01-07 17:12 ` [PATCH v2 net-next 1/5] net: local checksum offload for encapsulation Edward Cree
2016-01-07 17:22 ` David Laight
2016-01-07 17:54 ` Edward Cree [this message]
2016-01-07 18:42 ` Tom Herbert
2016-01-07 22:53 ` Alexander Duyck
2016-01-08 15:32 ` Edward Cree
2016-01-08 17:30 ` Alexander Duyck
2016-01-07 17:12 ` [PATCH v2 net-next 2/5] net: enable LCO for udp_tunnel_handle_offloads() users Edward Cree
2016-01-07 17:12 ` [PATCH v2 net-next 3/5] net: vxlan: enable local checksum offload Edward Cree
2016-01-08 0:15 ` Alexander Duyck
2016-01-08 15:33 ` Edward Cree
2016-01-08 3:46 ` Alexander Duyck
2016-01-08 15:39 ` Edward Cree
2016-01-08 18:03 ` Alexander Duyck
2016-01-08 19:40 ` Jesse Gross
2016-01-08 21:22 ` Alexander Duyck
2016-01-08 21:36 ` Rick Jones
2016-01-08 22:07 ` Tom Herbert
2016-01-11 17:24 ` Jesse Gross
2016-01-11 17:55 ` Tom Herbert
2016-01-11 18:27 ` Edward Cree
2016-01-11 18:43 ` Tom Herbert
2016-01-07 17:13 ` [PATCH v2 net-next 4/5] fou: enable LCO in FOU and GUE Edward Cree
2016-01-07 18:51 ` Tom Herbert
2016-01-07 19:00 ` Edward Cree
2016-01-07 17:14 ` [PATCH v2 net-next 5/5] Documentation/networking: add tx-offloads.txt to explain LCO Edward Cree
2016-01-07 18:58 ` Tom Herbert
2016-01-11 17:05 ` [RFC PATCH 0/2] Rework of "net: local checksum offload for encapsulation" Alexander Duyck
2016-01-11 17:06 ` [RFC PATCH 1/2] net: local checksum offload for encapsulation Alexander Duyck
2016-01-11 17:06 ` [RFC PATCH 2/2] net: Add support for UDP local checksum offload as a part of tunnel segmentation Alexander Duyck
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