From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Greg I Kerr <kerr.g-movQPkccWJngpn9g0Uvcdg@public.gmane.org>
Cc: Mike Heinz
<michael.heinz-h88ZbnxC6KDQT0dZR+AlfA@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: Write Packets to InfiniBand HCA
Date: Thu, 5 Jan 2012 12:10:40 +0200 [thread overview]
Message-ID: <4F057720.6030501@mellanox.com> (raw)
In-Reply-To: <CANtVaseDHYrS+oOZ8qYaxmFLfEVtfjt6hBGK0m0Y4KZ-CvLgWA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On 1/4/2012 11:23 PM, Greg I Kerr wrote:
> Yes I want to do this with IB. I wasn't aware that I could use a UD QP
> to write my own packets to the wire. Is this what you're suggesting I
> can use a UD QP for?
You'll have to further clarify the "my own packets" part of your
sentence... IB have some layers which come into play in various elements
(software/hardware of HCAs/switches) during the life cycle of the
packet. Specifically each IB packet would have an IB L2 header called
LRH, IB also has L3 header named GRH which is optional unless you need
multicast (or IBoE). The UD thing I mentioned is IB's L4 - the
transport. The most common transports are UD and RC. So if you go UD the
packet will have L2 (LRH) and L4 UD headers (called BTH plus DTH) which
on top of you add the payload.
Or.
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prev parent reply other threads:[~2012-01-05 10:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-03 2:49 Write Packets to InfiniBand HCA Greg I Kerr
[not found] ` <CANtVascW3aRunBOSevwJgv8vN6gnNjmZM=8vLii=pUsDaFam3w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-03 14:53 ` Mike Heinz
[not found] ` <4C2744E8AD2982428C5BFE523DF8CDCB5CCCCCFB63-amwN6d8PyQWXx9kJd3VG2h2eb7JE58TQ@public.gmane.org>
2012-01-03 16:43 ` Greg I Kerr
[not found] ` <CANtVasebZqgxoZOVMJ7uRGN7subRZqgq1vWjh_r11vXxa--Qog-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-03 23:40 ` Roland Dreier
[not found] ` <CAL1RGDUOZw-+8R+rbsErd7PdB4gUH=zv1NYN-W1bxO5_ZgpdXQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-04 14:12 ` Mike Heinz
2012-01-04 21:03 ` Or Gerlitz
[not found] ` <CAJZOPZ+-muTk9s_k61-+_=JFJRsg0RGOvGuMJu46mYCAYR7uqw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-04 21:23 ` Greg I Kerr
[not found] ` <CANtVaseDHYrS+oOZ8qYaxmFLfEVtfjt6hBGK0m0Y4KZ-CvLgWA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-01-05 10:10 ` Or Gerlitz [this message]
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