From patchwork Thu Sep 26 10:05:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavan Nikhilesh Bhagavatula X-Patchwork-Id: 59849 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 97F1F1BFB8; Thu, 26 Sep 2019 12:06:49 +0200 (CEST) Received: from mx0b-0016f401.pphosted.com (mx0b-0016f401.pphosted.com [67.231.156.173]) by dpdk.org (Postfix) with ESMTP id 512271BFB6 for ; Thu, 26 Sep 2019 12:06:48 +0200 (CEST) Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id x8QA4fII032589; Thu, 26 Sep 2019 03:06:47 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=pfpt0818; bh=18/E0V+JrXIlXzLS1Wt1Vqe48bkdjLgHnBCjko9M+b8=; b=nfYcPYYfV0gtKc0piAakSU2AncTCVMzMQgv154B7ZWFe0EkDaTZcPPMACtIw2ms4j38L aXkbVlmrtq3eIeETAxbpRjReYzXFtDLnh8ADbgpB2XLnS9WAJMsENHdLUM/m1pYSGQMV C6/vmz9QgzZpupNX608JwtMQrX8IcLtnH6udnRdRcW3HrTQKtF/Msm+KH0K0KPYV6ah4 AwmRJ6vp0ZDpKapl5TpMvi5kmIBifz2VSc0nustB8MxrJharAzh3UZsXchJNjO9BveZe qh7Py3Ax7yODd4m27g3g+jRoOI79JR9eIMxwKPw3aYT0icQTgXadO+j1qm0SkI1SEf7L 4Q== Received: from sc-exch04.marvell.com ([199.233.58.184]) by mx0b-0016f401.pphosted.com with ESMTP id 2v8u5dr1cy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Thu, 26 Sep 2019 03:06:47 -0700 Received: from SC-EXCH03.marvell.com (10.93.176.83) by SC-EXCH04.marvell.com (10.93.176.84) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Thu, 26 Sep 2019 03:06:44 -0700 Received: from maili.marvell.com (10.93.176.43) by SC-EXCH03.marvell.com (10.93.176.83) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Thu, 26 Sep 2019 03:06:44 -0700 Received: from BG-LT7430.marvell.com (unknown [10.28.17.15]) by maili.marvell.com (Postfix) with ESMTP id 4FD313F7040; Thu, 26 Sep 2019 03:06:41 -0700 (PDT) From: To: , , Marko Kovacevic , Ori Kam , Bruce Richardson , Radu Nicolau , "Tomasz Kantecki" , John McNamara CC: , Sunil Kumar Kori Date: Thu, 26 Sep 2019 15:35:58 +0530 Message-ID: <20190926100558.24348-12-pbhagavatula@marvell.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190926100558.24348-1-pbhagavatula@marvell.com> References: <20190926100558.24348-1-pbhagavatula@marvell.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-09-26_04:2019-09-25,2019-09-26 signatures=0 Subject: [dpdk-dev] [PATCH 11/11] doc: update l3fwd user guide to support eventdev 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: , Errors-To: dev-bounces@dpdk.org Sender: "dev" From: Sunil Kumar Kori Update l3fwd user guide to include event device related information. Signed-off-by: Sunil Kumar Kori --- doc/guides/sample_app_ug/l3_forward.rst | 76 +++++++++++++++++++++++-- 1 file changed, 70 insertions(+), 6 deletions(-) diff --git a/doc/guides/sample_app_ug/l3_forward.rst b/doc/guides/sample_app_ug/l3_forward.rst index 4cb4b18da..c4b7d5fab 100644 --- a/doc/guides/sample_app_ug/l3_forward.rst +++ b/doc/guides/sample_app_ug/l3_forward.rst @@ -4,16 +4,23 @@ L3 Forwarding Sample Application ================================ -The L3 Forwarding application is a simple example of packet processing using the DPDK. +The L3 Forwarding application is a simple example of packet processing using +DPDK to demonstrate usage of poll and event mode packet I/O mechanism. The application performs L3 forwarding. Overview -------- -The application demonstrates the use of the hash and LPM libraries in the DPDK to implement packet forwarding. -The initialization and run-time paths are very similar to those of the :doc:`l2_forward_real_virtual`. -The main difference from the L2 Forwarding sample application is that the forwarding decision -is made based on information read from the input packet. +The application demonstrates the use of the hash and LPM libraries in the DPDK +to implement packet forwarding using poll or event mode PMDs for packet I/O. +The initialization and run-time paths are very similar to those of the +:doc:`l2_forward_real_virtual` and :doc:`l2_forward_event_real_virtual`. +The main difference from the L2 Forwarding sample application is that optionally +packet can be Rx/Tx from/to eventdev instead of port directly and forwarding +decision is made based on information read from the input packet. + +Eventdev can optionally use S/W or H/W (if supported by platform) scheduler +implementation for packet I/O based on run time parameters. The lookup method is either hash-based or LPM-based and is selected at run time. When the selected lookup method is hash-based, a hash object is used to emulate the flow classification stage. @@ -56,6 +63,8 @@ The application has a number of command line options:: [--ipv6] [--parse-ptype] [--per-port-pool] + [--mode] + [--eventq-sync] Where, @@ -86,6 +95,11 @@ Where, * ``--per-port-pool:`` Optional, set to use independent buffer pools per port. Without this option, single buffer pool is used for all ports. +* ``--mode:`` Optional, Packet transfer mode for I/O, poll or eventdev. + +* ``--eventq-sync:`` Optional, Event queue synchronization method, Ordered or Atomic. Only valid if --mode=eventdev. + + For example, consider a dual processor socket platform with 8 physical cores, where cores 0-7 and 16-23 appear on socket 0, while cores 8-15 and 24-31 appear on socket 1. @@ -116,6 +130,51 @@ In this command: | | | | | +----------+-----------+-----------+-------------------------------------+ +To use eventdev mode with sync method **ordered** on above mentioned environment, +Following is the sample command: + +.. code-block:: console + + ./build/l3fwd -l 0-3 -n 4 -w -- -p 0x3 --eventq-sync=ordered + +or + +.. code-block:: console + + ./build/l3fwd -l 0-3 -n 4 -w -- -p 0x03 --mode=eventdev --eventq-sync=ordered + +In this command: + +* -w option whitelist the event device supported by platform. Way to pass this device may vary based on platform. + +* The --mode option defines PMD to be used for packet I/O. + +* The --eventq-sync option enables synchronization menthod of event queue so that packets will be scheduled accordingly. + +If application uses S/W scheduler, it uses following DPDK services: + +* Software scheduler +* Rx adapter service function +* Tx adapter service function + +Application needs service cores to run above mentioned services. Service cores +must be provided as EAL parameters along with the --vdev=event_sw0 to enable S/W +scheduler. Following is the sample command: + +.. code-block:: console + + ./build/l3fwd -l 0-7 -s 0-3 -n 4 --vdev event_sw0 -- -p 0x3 --mode=eventdev --eventq-sync=ordered + +In case of eventdev mode, *--config* option is not used for ethernet port +configuration. Instead each ethernet port will be configured with mentioned +setup: + +* Single Rx/Tx queue + +* Each Rx queue will be connected to event queue via Rx adapter. + +* Each Tx queue will be connected via Tx adapter. + Refer to the *DPDK Getting Started Guide* for general information on running applications and the Environment Abstraction Layer (EAL) options. @@ -125,7 +184,7 @@ Explanation ----------- The following sections provide some explanation of the sample application code. As mentioned in the overview section, -the initialization and run-time paths are very similar to those of the :doc:`l2_forward_real_virtual`. +the initialization and run-time paths are very similar to those of the :doc:`l2_forward_real_virtual` and :doc:`l2_forward_event_real_virtual`. The following sections describe aspects that are specific to the L3 Forwarding sample application. Hash Initialization @@ -315,3 +374,8 @@ for LPM-based lookups is done by the get_ipv4_dst_port() function below: return ((rte_lpm_lookup(ipv4_l3fwd_lookup_struct, rte_be_to_cpu_32(ipv4_hdr->dst_addr), &next_hop) == 0)? next_hop : portid); } + +Eventdev Driver Initialization +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Eventdev driver initialization is same as L2 forwarding eventdev application. +Refer :doc:`l2_forward_event_real_virtual` for more details.