From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f66.google.com (mail-wm0-f66.google.com [74.125.82.66]) by dpdk.org (Postfix) with ESMTP id 057771BA9A for ; Wed, 11 Apr 2018 02:04:50 +0200 (CEST) Received: by mail-wm0-f66.google.com with SMTP id r191so579108wmg.4 for ; Tue, 10 Apr 2018 17:04:49 -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=6eZGoRLBzWwv3l2iaVF6qtwccKDlyB5ZmUHYY78ogm0=; b=GhflLN9hLe0V0QFe9FQdbAQBE4FLEXy203mUiVeJyCSxKXABJy/nc4skwUpM2sPf58 o1rlIbqzsa62J3zqJa4AxGwamSFw/VAjOYoaEHNP4wKZZfvP3BWIXf+xbPIO9UsWb396 Ai3hp1iSP2/AeqGWUbn/TY6k71EsYA9krbQ4ZhPeYbZdfdWrTqsoVpAtpr3Cs7z/zvN1 +7yo0GYxPNqlMNmNPegKc/tLM4N7eaoyQ5ePg58kv6943+gHmyT58qvjyRmKU67F1yD6 XgPhbIXpFVCpTwOgHNYT9jJ10ugDemfDFNTxedVz3fvHTMnz1OOhdwXWOE6CHhWUN3Fs o8uQ== 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=6eZGoRLBzWwv3l2iaVF6qtwccKDlyB5ZmUHYY78ogm0=; b=uNYfTXLvnMKPAHIlsuPdHOwdBOB36Vhvs762ioif4dSYpgYG+wXVTeFLvHTZtUgJb0 BuaTS0KNqLpK1+MUhzFw8ldIOITe/5Y24I+FRzgJjJeln/7od/G0zM4wcybxEIJOstVa 9QSFoPBQpttyK/HvFokPjVP/Ntg7U8rRIcDENOsOOEOAlCXnqpuR00rY88taFlheMjhA tdOV1vipc1afeLD5cXiAsgSsrIvK9mO3QMvlLcooQRBDX87UVJfesCO99FppzA5+Xl+L iLfmBNmLj71VT+Cw5FP2vHBbstFv2x0WxrpJIZPhwfsecJvHUj0VbYrrNOrhe9ueqXUE /6jA== X-Gm-Message-State: ALQs6tDO33fP9pEVJZt0tFcbdTT2H1O0VyrP/wIyDb+2ms+QnrtgoATO IevOghtnuB0tXgxq9X1y9ZdgYVQy X-Google-Smtp-Source: AIpwx48Jv4ZUMBuVjWftvbwlaSiHzCNm6ML5ovUvDE9MeHlx7dYEgckjqvbBkLF31ulRITB4gJGVOQ== X-Received: by 10.28.10.83 with SMTP id 80mr1045499wmk.70.1523405089374; Tue, 10 Apr 2018 17:04:49 -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 39sm7626563wry.89.2018.04.10.17.04.48 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Apr 2018 17:04:48 -0700 (PDT) From: Gaetan Rivet To: dev@dpdk.org Cc: Gaetan Rivet Date: Wed, 11 Apr 2018 02:04:07 +0200 Message-Id: <2ce084b6e186d0b77a687f03ebf12b70f4068a87.1523404469.git.gaetan.rivet@6wind.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Subject: [dpdk-dev] [PATCH v5 06/21] 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: Wed, 11 Apr 2018 00:04:50 -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 b688f1efd..937ff6079 100644 --- a/lib/librte_eal/common/include/rte_dev.h +++ b/lib/librte_eal/common/include/rte_dev.h @@ -263,6 +263,53 @@ __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