From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f194.google.com (mail-wr0-f194.google.com [209.85.128.194]) by dpdk.org (Postfix) with ESMTP id 4CFA31B41A for ; Sun, 15 Apr 2018 17:08:19 +0200 (CEST) Received: by mail-wr0-f194.google.com with SMTP id h3so6677446wrh.5 for ; Sun, 15 Apr 2018 08:08:19 -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=WE9gQzm5fkyoFbgY1A54U+HaAqwWsyHwh1I06zEilyJ2z2coQFVfXQ1eydP0iRxhq4 I/rYgaMweFooyCuDKb4ZWK3gSDUPt/347oZvA4Sacy1cZlaCcohK0zjf7K0xDVvV8nZT 26Cz+mVGDxdIwXBPjtHzQLH8EkHR+gvueEnLexblvx3q2k6xDfX28iQPT3et4/ldUbCY L5DaU/mGXIQWpkNMWj34Z8W78ixQid7mUwyyOYMD7qZ5DI6Z1De+AsD2wT+EVw6pP5HR ESLyqBvlRHX5u89CwmLaP5v3FAmWrZfZUvRyqy9bkS0Wj7pL1KQwH8BHQCB9NcHLdPtH o77A== 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=kdjmQhQiAVzu2ZZd8AzLcBGWl9nkeVGtArjb+lxDtHMYggds8RUJJJ+Qpe91xj2cVE MeRIGQJ78559BD+pTYCKBrnMgji+jzXdzkck7PyC5p4UGHXWnkd9mwxyLEmgAUsdnSnb C6VMdybZ1pCIxHXAiMbWVTf6tl+BbP8n552UGwQBfOmqgt7ixbY8yhGjSfLrmpwZsIzE +b0eOAFwnvdn7PKjQQcF5a7qVvz/OlvUg63IzHm2XtkRxFb7XiYYtjfz+LgrHqizfNSo WQPzeR/hGvPJ+xzrUYxRtBdOV8V9lm+voNHqwtA2FxH8D7jfGyXxbSBjBkqnBp1z4n9p rOgg== X-Gm-Message-State: ALQs6tCgg+9gTwJb+p1GOdHqsgpQ7QoG9zvaj8awr6kO55TsvUBDpmjs I6F58kVDIdD5Y2lwAULiNBnM2KN4 X-Google-Smtp-Source: AIpwx4+ihWXTdDL657DxbvJ2+Ax0YTjShwiVuOsUyA418/2ARkPiQ1lY1up9V/w449tELjEHxeUQtQ== X-Received: by 10.28.40.4 with SMTP id o4mr8698001wmo.44.1523804898617; Sun, 15 Apr 2018 08:08:18 -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 r200sm13673438wmb.39.2018.04.15.08.08.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 15 Apr 2018 08:08:17 -0700 (PDT) From: Gaetan Rivet To: dev@dpdk.org Cc: Gaetan Rivet Date: Sun, 15 Apr 2018 17:07:36 +0200 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Subject: [dpdk-dev] [PATCH v7 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: Sun, 15 Apr 2018 15:08:19 -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