From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-we0-f173.google.com (mail-we0-f173.google.com [74.125.82.173]) by dpdk.org (Postfix) with ESMTP id A8CFA3F9 for ; Tue, 7 Jan 2014 09:34:50 +0100 (CET) Received: by mail-we0-f173.google.com with SMTP id t60so238772wes.18 for ; Tue, 07 Jan 2014 00:36:02 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :cc:subject:references:in-reply-to:content-type; bh=5ZQOpOQx+NbGiDRHIgUxCHrqvnQwtuykyNsK9QxNwpY=; b=Azxf7oV0OlN0Iwgh4i5UzvYPCtMAG6uVbUCKPhKYxqFcEmTZXtSwcK1DgqLBKHu18K tDkKOQ/OruxWk0LZg0TISKg3MUnvc1ctegHz2Aio1NXWuMWWPpsaqTmyZuct2Mqj3KIW kDZl1XPDdVYjCLopi/1sCC7uJPVKh6GnwO9R0HciIjHiX5jx+ucsjjDrGbkyoD5Xq4NW qE+tmwVu4X9Sbhjn+uiG7u6MpZIEQoT7heeUQj+Wx5RfFUj8NVKsNLJzD/J7PQWgGZRA TQlxGH4rTNpKWu3GbCof40Z+9KUmQ9ZUM55Syn05ZYSO0/60SliBZLeyqdJoHFdriZAf RmWw== X-Gm-Message-State: ALoCoQlqWg/TKTmIhTh0/drpz7lQH8bev03uR7u+bkZstkEeAXK6OQkzkfV98kUTVlQAT3Qfex2I X-Received: by 10.194.78.210 with SMTP id d18mr76509582wjx.27.1389083762101; Tue, 07 Jan 2014 00:36:02 -0800 (PST) Received: from [10.16.0.189] (6wind.net2.nerim.net. [213.41.180.237]) by mx.google.com with ESMTPSA id a9sm2307833wiy.10.2014.01.07.00.36.00 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 07 Jan 2014 00:36:01 -0800 (PST) Message-ID: <52CBBC6F.6030401@6wind.com> Date: Tue, 07 Jan 2014 09:35:59 +0100 From: Ivan Boule User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131103 Icedove/17.0.10 MIME-Version: 1.0 To: Michael Quicquaro References: <52CACA17.7000202@6wind.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Cc: "dev@dpdk.org" Subject: Re: [dpdk-dev] Redirection Table X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Jan 2014 08:34:51 -0000 On 01/06/2014 05:52 PM, Michael Quicquaro wrote: > Thanks for the details. Can the hash function be modified so that I > can provide my own RSS function? i.e. my ultimate goal is to provide > RSS that is not dependent on packet contents. No, the RSS function is "hard-wired" and only works on IPv4/IPv6 packets. All other packets are stored in the same queue (0 by default). You can change the RSS key used by the RSS function to compute the hash value. See the following testpmd command: port config X rss-hash-key <80 hexa digits> to set the 320-bit RSS key of port X. Best regards, Ivan > You may have seen my thread "generic load balancing". At this point, > I'm realizing that the only way to accomplish this is to let the > packets land where they may (the queue where the NIC places the > packet) and distribute them (to other queues) by having some of the > CPU processing devoted to this task. Can you verify this? > > Regards, > - Michael. > > > On Mon, Jan 6, 2014 at 10:21 AM, Ivan Boule > wrote: > > On 12/31/2013 08:45 PM, Michael Quicquaro wrote: > > Has anyone used the "port config all reta (hash,queue)" > command of testpmd > with any success? > > I haven't found much documentation on it. > > Can someone provide an example on why and how it was used. > > Regards and Happy New Year, > Michael Quicquaro > > Hi Michael, > > "RETA" stands for Redirection Table. > It is a per-port configurable table of 128 entries that is used by the > RSS filtering feature of Intel 1GbE and 10GbE controllers to > select the > RX queue into which to store a received IP packet. > When receiving an IPv4/IPv6 packet, the controller computes a 32-bit > hash on: > > * the source address and the destination address of the IP header of > the packet, > * the source port and the destination port of the UDP/TCP > header, if any. > > Then, the controller takes the 7 lower bits of the RSS hash as an > index > into the RETA table to get the RX queue number where to store the > packet. > > The API of the DPDK includes a function that is exported by Poll Mode > Drivers to configure RETA entries of a given port. > > For test purposes, the testpmd application includes the following > command > > "port config X rss reta (hash,queue)[,(hash,queue)]" > > to configure RETA entries of a port X, with each couple (hash,queue) > contains the index of a RETA entry (between 0 and 127 included) > and the > RX queue number (between 0 and 15) to be stored into that RETA entry. > > Best regards > Ivan > > -- > Ivan Boule > 6WIND Development Engineer > > -- Ivan Boule 6WIND Development Engineer