From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Tal Alon <talal-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Matan Barak <matanb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Moshe Lazer <moshel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH REPOST libibverbs] Add IP and TCP/UDP TX checksum offload support
Date: Thu, 18 Jun 2015 10:38:42 -0600 [thread overview]
Message-ID: <20150618163842.GA14348@obsidianresearch.com> (raw)
In-Reply-To: <1434276784-15909-1-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
On Sun, Jun 14, 2015 at 01:13:04PM +0300, Or Gerlitz wrote:
> From: Moshe Lazer <moshel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
>
> Add a device capability flag IB_DEVICE_IP_SUM to denote checksum offload
> support. Devices should set this flag if they support insertion of IP, TCP
> and UDP checksums on outgoing IP packets sent over IB UD or ETH RAW_PACKET QPs.
It would be really nice to see the man page discuss exactly what is
done here, there are quite a few different options for checksum.
IPoIB maps this to 'NETIF_F_IP_CSUM', so only UDP/TCP checksum in
IPv4.
What value should be placed in the checksum header(s) prior to issuing
the send? It looks like IPoIB uses the CHECKSUM_PARTIAL protocol ?
This should all be made clear in the man page, IMHO.
Jason
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next prev parent reply other threads:[~2015-06-18 16:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-14 10:13 [PATCH REPOST libibverbs] Add IP and TCP/UDP TX checksum offload support Or Gerlitz
[not found] ` <1434276784-15909-1-git-send-email-ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-06-18 15:21 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1506181021160.13957-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-07-01 15:17 ` Christoph Lameter
[not found] ` <alpine.DEB.2.11.1507011015400.20250-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2015-07-29 16:32 ` Doug Ledford
2015-06-18 16:38 ` Jason Gunthorpe [this message]
[not found] ` <20150618163842.GA14348-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-08-11 8:39 ` Or Gerlitz
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