From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FDC6EF36F8 for ; Mon, 9 Mar 2026 07:49:00 +0000 (UTC) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id B6DF7402EF; Mon, 9 Mar 2026 08:48:59 +0100 (CET) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by mails.dpdk.org (Postfix) with ESMTP id BE4AD40281; Mon, 9 Mar 2026 08:48:58 +0100 (CET) Received: from mail.maildlp.com (unknown [172.18.224.83]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4fTpzp2nMGzHnH4s; Mon, 9 Mar 2026 15:48:54 +0800 (CST) Received: from dubpeml500001.china.huawei.com (unknown [7.214.147.241]) by mail.maildlp.com (Postfix) with ESMTPS id B017140572; Mon, 9 Mar 2026 15:48:57 +0800 (CST) Received: from dubpeml500001.china.huawei.com (7.214.147.241) by dubpeml500001.china.huawei.com (7.214.147.241) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 9 Mar 2026 07:48:57 +0000 Received: from dubpeml500001.china.huawei.com ([7.214.147.241]) by dubpeml500001.china.huawei.com ([7.214.147.241]) with mapi id 15.02.1544.011; Mon, 9 Mar 2026 07:48:57 +0000 From: Konstantin Ananyev To: Robin Jarry , "dev@dpdk.org" , "Yipeng Wang" , Sameh Gobriel , "Bruce Richardson" , Vladimir Medvedkin , Ray Kinsella , Ruifeng Wang , Dharmik Thakkar CC: "stable@dpdk.org" Subject: RE: [PATCH dpdk v3 2/2] hash: free replaced data on overwrite when RCU is configured Thread-Topic: [PATCH dpdk v3 2/2] hash: free replaced data on overwrite when RCU is configured Thread-Index: AQHcrUXnWQN/pYas8EynXYWGlT0VyrWl16WQ Date: Mon, 9 Mar 2026 07:48:57 +0000 Message-ID: References: <20260212213313.1376294-5-rjarry@redhat.com> <20260306084710.492520-4-rjarry@redhat.com> <20260306084710.492520-6-rjarry@redhat.com> In-Reply-To: <20260306084710.492520-6-rjarry@redhat.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.81.203.174] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 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 > When rte_hash_add_key_data() overwrites an existing key, the old data > pointer is silently lost. With RCU-protected readers still potentially > accessing the old data, the application has no safe way to free it. >=20 > When RCU is configured with a free_key_data_func callback, automatically > enqueue the old data for deferred freeing via the RCU defer queue on > overwrite. In SYNC mode, synchronize and call free_key_data_func > directly. >=20 > Cc: stable@dpdk.org > Fixes: 769b2de7fb52 ("hash: implement RCU resources reclamation") >=20 > Signed-off-by: Robin Jarry > --- Acked-by: Konstantin Ananyev =20 > 2.53.0 >=20