From: David Miller <davem@davemloft.net>
To: ecree@solarflare.com
Cc: tom@herbertland.com, netdev@vger.kernel.org
Subject: Re: Checksum offload queries
Date: Tue, 08 Dec 2015 12:09:11 -0500 (EST) [thread overview]
Message-ID: <20151208.120911.1930136653560954435.davem@davemloft.net> (raw)
In-Reply-To: <5666FF46.6030702@solarflare.com>
From: Edward Cree <ecree@solarflare.com>
Date: Tue, 8 Dec 2015 16:03:18 +0000
> NETIF_F_HW_CSUM is limited to one checksum per packet.
This is false.
As we demux encapsulation layers, we re-adjust the provided 1's
complement sum provided and use that to validate the next layer.
This works for arbitrarily nested encapsulations, and therefore
can support mutliple checksums per packet.
Tom has also created a scheme, called remote checksum offload,
that deals with the corner cases that are actually not able
to be handled fully by NETIF_F_HW_CSUM.
next prev parent reply other threads:[~2015-12-08 17:09 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-07 15:39 Checksum offload queries Edward Cree
2015-12-07 17:29 ` Tom Herbert
2015-12-07 17:52 ` Tom Herbert
2015-12-08 16:03 ` Edward Cree
2015-12-08 16:43 ` Tom Herbert
2015-12-08 18:03 ` Edward Cree
2015-12-08 17:09 ` David Miller [this message]
2015-12-08 17:24 ` Edward Cree
2015-12-08 17:28 ` David Miller
2015-12-07 19:38 ` David Miller
2015-12-08 14:42 ` Edward Cree
2015-12-08 17:04 ` Tom Herbert
2015-12-09 1:56 ` Thomas Graf
2015-12-09 16:08 ` Tom Herbert
2015-12-09 22:29 ` Thomas Graf
2015-12-09 22:51 ` Tom Herbert
2015-12-09 23:13 ` Thomas Graf
2015-12-08 17:06 ` David Miller
2015-12-09 12:14 ` Edward Cree
2015-12-09 16:01 ` Tom Herbert
2015-12-09 17:28 ` Edward Cree
2015-12-09 17:31 ` David Laight
2015-12-09 18:00 ` Tom Herbert
2015-12-09 22:21 ` Thomas Graf
2015-12-09 22:42 ` Tom Herbert
2015-12-09 22:44 ` Thomas Graf
2015-12-10 15:49 ` Edward Cree
2015-12-10 16:26 ` Tom Herbert
2015-12-10 20:28 ` Edward Cree
2015-12-10 21:02 ` Rustad, Mark D
2015-12-14 15:11 ` [RFC PATCH net-next 0/2] Local checksum offload for VXLAN Edward Cree
2015-12-14 15:13 ` [PATCH 1/2] net: udp: local checksum offload for encapsulation Edward Cree
2015-12-14 17:16 ` Tom Herbert
2015-12-15 18:07 ` Edward Cree
2015-12-14 15:13 ` [PATCH 2/2] net: vxlan: enable local checksum offload on HW_CSUM devices Edward Cree
2015-12-11 23:50 ` Checksum offload queries Tom Herbert
2015-12-12 16:41 ` Sowmini Varadhan
2015-12-12 17:24 ` Tom Herbert
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