From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f195.google.com (mail-wr0-f195.google.com [209.85.128.195]) by dpdk.org (Postfix) with ESMTP id D649F1BE09 for ; Tue, 26 Jun 2018 18:56:58 +0200 (CEST) Received: by mail-wr0-f195.google.com with SMTP id e18-v6so17976672wrs.5 for ; Tue, 26 Jun 2018 09:56:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=+PtSwL92xvH7QaDOLlLEBP1myR80ZkQw2JwqGJe+bOA=; b=DYMQUxEnkiy1QinlUZowWV1sxiCYf9fGtwsOT+6etbhZmVa+KhdaIVHdSQYDqu8o9+ /fL8Pcn112NsGB88FmlO/x/2z34yluzPaVK4m6rA1BSHs90Bp7P6TxDCX5vPczjivWuo y39s+eNoh9CkRJlokNMCLTt+c6MHTE6Ns9II6RPfNpn7ObqkvMqxVZGbxt5F6HbsgFHA RKUQsjuaAIW21I4QQI/Tkm6cXh0+tjjqlfQe7Zsk/HdQY/Y3PlATf1tTYitFkkzLGdX5 HM+8qJlKCSM5FYEBKO4Rs5gr1Tah/KP45WfaTDEtROKi5qPlHhOUEb33C/kPRTMM0gD8 7n0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=+PtSwL92xvH7QaDOLlLEBP1myR80ZkQw2JwqGJe+bOA=; b=gaZv6jWUyY1RXGV7hkK6HUfR9aibgQnp2fjU4V2ADM2OGUBGTRKkECphM02oPOlcCZ 6Rk588XbuRLLX0Tn+qIZzi4/6dgdsmXZvL2BUnuDrtDRz73tqbAMMCHmmqVoma8F8hvA kEwlO3WIzNU0eo6Rl2A9rbhEHqzSUxmgDg5AYDl1TwrvDxOl/bGpRW51IQRRyCiNCyuM CB+vgDls293DHsxk//YvO+FKF3cjZB6LcOmtmPehNHNhNKowxF7BSiFpDwosl0nswX+V 0yRQt10IxlvnQ55xZLlu5UrErPMTp2pWquNFkqXAKBkKyGAjYslzuMY7aehzWCRXE3SG IKVQ== X-Gm-Message-State: APt69E0Ihc/G35tq51JekUqHg3xFlOJxPPWrJOqml+8S9ATJUdwOPQRu w2hOSKiuKOBrtw5ellycRYz5uQ1j X-Google-Smtp-Source: AAOMgpcvZ/dGpy7FQENM+vEvKs6t9VJvEDNNMHjyBQXHcBzqRogJsJvotEVrwCiDK9vC/2URkB2XnA== X-Received: by 2002:adf:a963:: with SMTP id u90-v6mr987421wrc.248.1530032218065; Tue, 26 Jun 2018 09:56:58 -0700 (PDT) Received: from bidouze.dev.6wind.com. (host.78.145.23.62.rev.coltfrance.com. [62.23.145.78]) by smtp.gmail.com with ESMTPSA id p5-v6sm2680880wre.83.2018.06.26.09.56.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Jun 2018 09:56:56 -0700 (PDT) From: Gaetan Rivet To: dev@dpdk.org Cc: Gaetan Rivet Date: Tue, 26 Jun 2018 18:56:11 +0200 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Subject: [dpdk-dev] [PATCH v8 08/21] eal/dev: add device iterator interface 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: Tue, 26 Jun 2018 16:56:59 -0000 A device iterator allows iterating over a set of devices. This set is defined by the two descriptions offered, * rte_bus * rte_class Only one description can be provided, or both. It is not allowed to provide no description at all. Each layer of abstraction then performs a filter based on the description provided. This filtering allows iterating on their internal set of devices, stopping when a match is valid and returning the current iteration context. This context allows starting the next iteration from the same point and going forward. Signed-off-by: Gaetan Rivet --- lib/librte_eal/common/include/rte_dev.h | 47 +++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h index 3879ff3ca..120df729f 100644 --- a/lib/librte_eal/common/include/rte_dev.h +++ b/lib/librte_eal/common/include/rte_dev.h @@ -285,6 +285,53 @@ __attribute__((used)) = str static const char DRV_EXP_TAG(name, kmod_dep_export)[] \ __attribute__((used)) = str +/** + * Iteration context. + * + * This context carries over the current iteration state. + */ +struct rte_dev_iterator { + const char *devstr; /**< device string. */ + const char *busstr; /**< bus-related part of device string. */ + const char *clsstr; /**< class-related part of device string. */ + struct rte_bus *bus; /**< bus handle. */ + struct rte_class *cls; /**< class handle. */ + struct rte_device *device; /**< current position. */ + void *class_device; /**< additional specialized context. */ +}; + +/** + * Device iteration function. + * + * Find the next device matching properties passed in parameters. + * The function takes an additional ``start`` parameter, that is + * used as starting context when relevant. + * + * The function returns the current element in the iteration. + * This return value will potentially be used as a start parameter + * in subsequent calls to the function. + * + * The additional iterator parameter is only there if a specific + * implementation needs additional context. It must not be modified by + * the iteration function itself. + * + * @param start + * Starting iteration context. + * + * @param devstr + * Device description string. + * + * @param it + * Device iterator. + * + * @return + * The address of the current element matching the device description + * string. + */ +typedef void *(*rte_dev_iterate_t)(const void *start, + const char *devstr, + const struct rte_dev_iterator *it); + #ifdef __cplusplus } #endif -- 2.11.0