From patchwork Tue Apr 13 03:14:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xueming Li X-Patchwork-Id: 91157 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 33740A0524; Tue, 13 Apr 2021 05:15:11 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 20C821609BF; Tue, 13 Apr 2021 05:15:11 +0200 (CEST) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by mails.dpdk.org (Postfix) with ESMTP id 16F781609BB for ; Tue, 13 Apr 2021 05:15:10 +0200 (CEST) Received: from Internal Mail-Server by MTLPINE1 (envelope-from xuemingl@nvidia.com) with SMTP; 13 Apr 2021 06:15:06 +0300 Received: from nvidia.com (pegasus05.mtr.labs.mlnx [10.210.16.100]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 13D3EQxr015492; Tue, 13 Apr 2021 06:15:05 +0300 From: Xueming Li To: Thomas Monjalon , Gaetan Rivet Cc: dev@dpdk.org, xuemingl@nvidia.com, Asaf Penso , Olivier Matz , Ray Kinsella , Neil Horman Date: Tue, 13 Apr 2021 03:14:10 +0000 Message-Id: <1618283653-16510-4-git-send-email-xuemingl@nvidia.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1618283653-16510-1-git-send-email-xuemingl@nvidia.com> References: <1618283653-16510-1-git-send-email-xuemingl@nvidia.com> In-Reply-To: <1608304614-13908-2-git-send-email-xuemingl@nvidia.com> References: <1608304614-13908-2-git-send-email-xuemingl@nvidia.com> Subject: [dpdk-dev] [PATCH v5 3/5] kvargs: add get by key function X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Adds a new function to get value of a specific key from kvargs list. Signed-off-by: Xueming Li Reviewed-by: Gaetan Rivet --- lib/librte_kvargs/rte_kvargs.c | 15 +++++++++++++++ lib/librte_kvargs/rte_kvargs.h | 20 ++++++++++++++++++++ lib/librte_kvargs/version.map | 3 +++ 3 files changed, 38 insertions(+) diff --git a/lib/librte_kvargs/rte_kvargs.c b/lib/librte_kvargs/rte_kvargs.c index ffae8914cf..4cce8e953b 100644 --- a/lib/librte_kvargs/rte_kvargs.c +++ b/lib/librte_kvargs/rte_kvargs.c @@ -203,6 +203,21 @@ rte_kvargs_free(struct rte_kvargs *kvlist) free(kvlist); } +/* Lookup a value in an rte_kvargs list by its key. */ +const char * +rte_kvargs_get(const struct rte_kvargs *kvlist, const char *key) +{ + unsigned int i; + + if (kvlist == NULL || key == NULL) + return NULL; + for (i = 0; i < kvlist->count; ++i) { + if (strcmp(kvlist->pairs[i].key, key) == 0) + return kvlist->pairs[i].value; + } + return NULL; +} + /* * Parse the arguments "key=value,key=value,..." string and return * an allocated structure that contains a key/value list. Also diff --git a/lib/librte_kvargs/rte_kvargs.h b/lib/librte_kvargs/rte_kvargs.h index eff598e08b..ab8a8186f6 100644 --- a/lib/librte_kvargs/rte_kvargs.h +++ b/lib/librte_kvargs/rte_kvargs.h @@ -114,6 +114,26 @@ struct rte_kvargs *rte_kvargs_parse_delim(const char *args, */ void rte_kvargs_free(struct rte_kvargs *kvlist); +/** + * Get the value associated with a given key. + * + * If multiple key matches, the value of the first one is returned. + * + * The memory returned is allocated as part of the rte_kvargs structure, + * it must never be modified. + * + * @param kvlist + * A list of rte_kvargs pair of 'key=value'. + * @param key + * The matching key. + + * @return + * NULL if no key matches the input, a value associated with a matching + * key otherwise. + */ +__rte_experimental +const char *rte_kvargs_get(const struct rte_kvargs *kvlist, const char *key); + /** * Call a handler function for each key/value matching the key * diff --git a/lib/librte_kvargs/version.map b/lib/librte_kvargs/version.map index ed375bf4a3..fb9bed4f93 100644 --- a/lib/librte_kvargs/version.map +++ b/lib/librte_kvargs/version.map @@ -15,4 +15,7 @@ EXPERIMENTAL { rte_kvargs_parse_delim; rte_kvargs_strcmp; + # added in 21.05 + rte_kvargs_get; + };