From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivan Boule Subject: Re: Redirection Table Date: Mon, 06 Jan 2014 16:21:59 +0100 Message-ID: <52CACA17.7000202@6wind.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: "dev-VfR2kkLFssw@public.gmane.org" To: Michael Quicquaro Return-path: In-Reply-To: List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" 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