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 DEC7B7286 for ; Wed, 21 Mar 2018 18:16:05 +0100 (CET) Received: by mail-wr0-f194.google.com with SMTP id c24so5987822wrc.6 for ; Wed, 21 Mar 2018 10:16:05 -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=P/bpchrvZR7USjgYPyB7PoHcaFu+1uoFfAiyQBeQt8aUd/DjCFY33jPCuuvB26QJB0 zT7uQE/+Bzbdsk0jKG+R4opjqg62RSKoxYxIlXRDPsYqRV53YiphvhApJ9RVJw5PrnIF FkYzhGigmldYtf4iHEtm+q8M6q/LVmMrto2eYg5rFpzKXKxM6ksnk15TXFR93Dlr5kye WinfwX7HPtukc750U0ZDlTjQGK+OKJUbMP8qGSh2BtvbKGyBXZZtH16psicd8ewfqk4x 27KnWOz/NICZ80Iy2tSdmet7MANrv4FcADOHVtQ0FCspALnjuI16NYgo+wvTPImPcPBI cRUA== 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=n1XAY7sN2fGu9NihVNzee92ocpI9bTE1ZOTvr6RVkFmHClO64nCKzvxlARenYxph4E VBunZPNUo45shHzMZiW1OWg/C/LjGaHBFmlQJ5/s1QkrmgglUoUt1MQmDiCCmgdlj8KP trTiHCLAIDDidGVMUIAqBFa7Tiz01XvF6CLbbwD2vhMxtgskDnsVHS6kxjyXrc624+mb l6dzX6RC3n8icynSZF09juaFwxbGCcELxiy6JIWiKEs7rUKcEYgyNHZiMtKYk6B8IOYN aNUEajhobLcV5ZfAu4/A5ysPdTDoMe+0LskFiKLvHWFGkGbJx96w2A16nkco2Rn56rpp ZTow== X-Gm-Message-State: AElRT7EUs4fQ1Js/GDZ2IIv+30+KgIR4sdwKmIT+wtwT5TIvZcRm6f/g DGm5g/cP12U/SsbQP6jyYIuk+VB4 X-Google-Smtp-Source: AG47ELvevb0hrF6t3zPwgyXVvFJFAfyKFHdqVPfL+RNv3TkyXNS2YBS7IdOfMUJY2Jy5YDNHO/DSSQ== X-Received: by 10.223.135.115 with SMTP id 48mr10123808wrz.27.1521652564948; Wed, 21 Mar 2018 10:16:04 -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 l10sm4224101wrf.37.2018.03.21.10.16.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 21 Mar 2018 10:16:04 -0700 (PDT) From: Gaetan Rivet To: dev@dpdk.org Cc: Gaetan Rivet Date: Wed, 21 Mar 2018 18:15:26 +0100 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Subject: [dpdk-dev] [PATCH v2 05/18] 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, 21 Mar 2018 17:16:06 -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