From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id 3D1FB3237 for ; Mon, 30 Jan 2017 11:33:32 +0100 (CET) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga104.fm.intel.com with ESMTP; 30 Jan 2017 02:33:31 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,311,1477983600"; d="scan'208";a="1088852944" Received: from bricha3-mobl3.ger.corp.intel.com ([10.237.221.61]) by orsmga001.jf.intel.com with SMTP; 30 Jan 2017 02:33:29 -0800 Received: by (sSMTP sendmail emulation); Mon, 30 Jan 2017 10:33:29 +0000 Date: Mon, 30 Jan 2017 10:33:29 +0000 From: Bruce Richardson To: Sridhar Pitchai Cc: "dev@dpdk.org" , ferruh.yigit@intel.com Message-ID: <20170130103328.GA100504@bricha3-MOBL3.ger.corp.intel.com> References: <20170127213629.GA91748@bricha3-MOBL3.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Research and =?iso-8859-1?Q?De=ACvel?= =?iso-8859-1?Q?opment?= Ireland Ltd. User-Agent: Mutt/1.7.1 (2016-10-04) Subject: Re: [dpdk-dev] rte_eth_from_rings X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Jan 2017 10:33:33 -0000 On Fri, Jan 27, 2017 at 10:31:52PM +0000, Sridhar Pitchai wrote: > Thanks Bruce. > > > I have created eth_dev from the rings as below. > rt = rte_eth_from_rings(port_p->name, > (struct rte_ring * const*)port_p->rx_ring_p, 2, > (struct rte_ring * const*)port_p->tx_ring_p, 2, > rte_socket_id()); > > Lets say I have a call back something like > > pkt_rx(void * pkt_p, struct pkt_metadata_t *meta_p) > > which is called when there is a pkt at the chip. > inside this function(pkt_rx) i will find the port and the corresponding ring_p and > enqueue the pkt into the queue. I am assuming this should work. Kindly correct me if i misunderstood you. > Yes, it should work. > > question 2: > Can use this eth_dev to create KNI interface, like below. > rte_eth_dev_info_get(fp_p->port_list[port].key.port_id, &dev_info); > ; > ; > ; > ops.port_id = fp_p->port_list[port].key.port_id; // rt from rte_eth_from_rings(...) > ops.change_mtu = _kni_ifconfig_mtu; // static function > ops.config_network_if = _kni_ifconfig; // static functions > PORT(fp_p, port).kni_p = rte_kni_alloc(PORT(fp_p, port).mbuf_p, > &conf, &ops); > > I am assuming this should work as well. I find the netdevs created but when i try to configure > them i am facing the following error. > > root@ VM snaproute/softpath (master) >ifconfig PORT_8 > PORT_8 Link encap:Ethernet HWaddr be:35:c3:0f:f8:2f > BROADCAST MULTICAST MTU:1500 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) > > root@ VM snaproute/softpath (master) >ifconfig PORT_8 20.1.1.1/24 up > SIOCSIFFLAGS: Timer expired > SIOCSIFFLAGS: Timer expired > root@ VM snaproute/softpath (master) > > +Ferruh as KNI maintainer, to see if he can help out with this question. /Bruce > Thanks for the help. > > Thanks, > Sridhar Pitchai > > > ________________________________ > From: Bruce Richardson > Sent: Friday, January 27, 2017 1:36 PM > To: Sridhar Pitchai > Cc: dev@dpdk.org > Subject: Re: [dpdk-dev] rte_eth_from_rings > > On Fri, Jan 27, 2017 at 07:16:25PM +0000, Sridhar Pitchai wrote: > > Hi, > > > > I am trying to write a data path for packets punted to CPU(slowpath) from vender silicon like broadcom. I am planing to use "rte_eth_from_rings" like model where I will be able to read and write to the ring for the packets punted from vendor chip. > > > > > > the eth_dev abstraction provided by "rte_eth_from_rings" helps to build the dpdk data path. Can someone help me on how to read and write to the rings that is emulating the eth_dev. > > > > > To use the rings like an ethdev just use rte_eth_rx_burst and > rte_eth_tx_burst, passing in the port id of your newly created rings > ethdev. To access them directly as rings, just use the ring > enqueue/dequeue functions passing in the ring pointer as normal. > > Regards, > /Bruce