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 9130C1BB81 for ; Fri, 13 Apr 2018 15:23:06 +0200 (CEST) Received: by mail-wr0-f195.google.com with SMTP id q13so4853806wre.3 for ; Fri, 13 Apr 2018 06:23:06 -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=qb26vx6RYXXIXfpRJKU1RnRSAL29Fg0r32rWm4DIAIU=; b=vEicAxyIDCraQqJLgPO8AFM+EtpTNdQd2F1REtEFfF2/zaYToB/EIzhrJDGDekdeuZ wraTbxZF2pk6EncFJw7aa+pmcBSat03xC2AyY6rf6ILPb2MbVa41H5hIVv55ay7PPgPm 0a+hC6KRfG1kgY3+8ZRuAHWVBR7qI0N7y3dnJi0yjS1dtOTFOGy7wR8z3k9UiFP82Myo 286mWyJXC/2VqCZBpjTTpbr321y9s20k9Ixy0A8t8BpbO9QrTetIexkwWP16NzMzUP3z XI99Y4Ft6dVZkcmpUzsDKl795Ayxip309A67WnoAU17EXVPgTX8scZtZkV7jr05GZ1/5 biwQ== 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=qb26vx6RYXXIXfpRJKU1RnRSAL29Fg0r32rWm4DIAIU=; b=RSHYHi2LkifWPAOkplkBqlzL6UtglBAL811QXm8mxajPJaYcT8KJIrdBeRBy2Srspy Z48Za6C5H19fszKtvgoXMXmTUY5vdyDVbBjcMqSTGA83a56GIvWXW6M0IkY6yYsh5lTG /O3wJXTZXqdUWFyEFktauHTZ86wqS5GIMH4AgwATR0cZvGCtl5SwBTUvE6Y3i9eBv43W RkiFYuCh2lYoQK6fYqyX+5lmABHyUb5SxLp0E1+IUDqDRGTSZtD759ixpx/AL9gg7kTz R+pCgU8txWd0Ul5nv+wgYy0fRtGWTt78TYctrxpR6p0Hk7x6geFmzCsLo+aqi3fpXq0M Y9/A== X-Gm-Message-State: ALQs6tA1n1tndF6k2TPIaXtZzKBAj+qwPosIbFdN0sNnBWhIr5y5xJhC UBQGXT43RoG30I3W9pplcUvinNpe X-Google-Smtp-Source: AIpwx48HrjJt5PblfcXkxKHJCPraNL7bBhjnENnFB8n+KG2jzKVmf/0pn47Knskb9z95FXw+b6IbBg== X-Received: by 10.223.182.18 with SMTP id f18mr3946155wre.211.1523625785864; Fri, 13 Apr 2018 06:23:05 -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 r200sm2377244wmb.9.2018.04.13.06.23.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 13 Apr 2018 06:23:05 -0700 (PDT) From: Gaetan Rivet To: dev@dpdk.org Cc: Gaetan Rivet Date: Fri, 13 Apr 2018 15:22:22 +0200 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Subject: [dpdk-dev] [PATCH v6 07/22] 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: Fri, 13 Apr 2018 13:23:07 -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 0955e9adb..a789defc3 100644 --- a/lib/librte_eal/common/include/rte_dev.h +++ b/lib/librte_eal/common/include/rte_dev.h @@ -282,6 +282,53 @@ __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