From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 16F6B46079; Tue, 14 Jan 2025 02:24:28 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 4018A4064F; Tue, 14 Jan 2025 02:23:49 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id 5EBBC402D3 for ; Tue, 14 Jan 2025 02:23:37 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1213) id B368520591AB; Mon, 13 Jan 2025 17:23:35 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com B368520591AB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1736817815; bh=SlP3EslH8vnCu1oSEoCNFmP/T7gjx8NAohmYb/YFNBk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hmWbQk8s5D4oypVO/wqjPjq3nJyHy6Q1RT7bZEsCxvm5pg+yY4F0l4y4ZsHfg+gD7 rHT1JbKUPwynhN9XkSt8cpgszHTYfJTsIeAMAAmR8mC3h0Y5nj6Oh6+dkqoCVX4gI+ XsSPPdstGZ+H4zmKCPgny8b6jYpC2f4+VnPFq5IA= From: Andre Muezerie To: dev@dpdk.org Cc: konstantin.ananyev@huawei.com, thomas@monjalon.net, david.marchand@redhat.com Subject: [PATCH v15 07/60] rcu: remove use of VLAs for Windows built code Date: Mon, 13 Jan 2025 17:22:19 -0800 Message-Id: <1736817792-24967-8-git-send-email-andremue@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1736817792-24967-1-git-send-email-andremue@linux.microsoft.com> References: <1713397319-26135-1-git-send-email-roretzla@linux.microsoft.com> <1736817792-24967-1-git-send-email-andremue@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 From: Konstantin Ananyev 1) ./lib/rcu/rte_rcu_qsbr.c:359:9 : warning: ISO C90 forbids variable length array ‘data’ [-Wvla] 2) ./lib/rcu/rte_rcu_qsbr.c:422:9 : warning: ISO C90 forbids variable length array ‘data’ [-Wvla] In both cases we allocate VLA for one element from RCU deferred queue. Right now, size of element in RCU queue is not limited by API. The approach is to introduce some reasonable limitation on RCU DQ element size. Choose 128B for now. With that in place we can replace both VLA occurencies with fixed size array. Note that such change need to be treated as API change. So can be applied only at 24.11. Signed-off-by: Konstantin Ananyev --- lib/rcu/rte_rcu_qsbr.c | 7 ++++--- lib/rcu/rte_rcu_qsbr.h | 5 +++++ 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/lib/rcu/rte_rcu_qsbr.c b/lib/rcu/rte_rcu_qsbr.c index dbf31501a6..fe68d16326 100644 --- a/lib/rcu/rte_rcu_qsbr.c +++ b/lib/rcu/rte_rcu_qsbr.c @@ -245,7 +245,8 @@ rte_rcu_qsbr_dq_create(const struct rte_rcu_qsbr_dq_parameters *params) if (params == NULL || params->free_fn == NULL || params->v == NULL || params->name == NULL || params->size == 0 || params->esize == 0 || - (params->esize % 4 != 0)) { + (params->esize % 4 != 0) || + params->esize > RTE_QSBR_ESIZE_MAX) { RCU_LOG(ERR, "Invalid input parameter"); rte_errno = EINVAL; @@ -323,7 +324,7 @@ int rte_rcu_qsbr_dq_enqueue(struct rte_rcu_qsbr_dq *dq, void *e) return 1; } - char data[dq->esize]; + char data[RTE_QSBR_ESIZE_MAX + __RTE_QSBR_TOKEN_SIZE]; dq_elem = (__rte_rcu_qsbr_dq_elem_t *)data; /* Start the grace period */ dq_elem->token = rte_rcu_qsbr_start(dq->v); @@ -386,7 +387,7 @@ rte_rcu_qsbr_dq_reclaim(struct rte_rcu_qsbr_dq *dq, unsigned int n, cnt = 0; - char data[dq->esize]; + char data[RTE_QSBR_ESIZE_MAX + __RTE_QSBR_TOKEN_SIZE]; /* Check reader threads quiescent state and reclaim resources */ while (cnt < n && rte_ring_dequeue_bulk_elem_start(dq->r, &data, diff --git a/lib/rcu/rte_rcu_qsbr.h b/lib/rcu/rte_rcu_qsbr.h index 550fadf56a..abcbd78914 100644 --- a/lib/rcu/rte_rcu_qsbr.h +++ b/lib/rcu/rte_rcu_qsbr.h @@ -86,6 +86,11 @@ struct __rte_cache_aligned rte_rcu_qsbr_cnt { #define __RTE_QSBR_CNT_MAX ((uint64_t)~0) #define __RTE_QSBR_TOKEN_SIZE sizeof(uint64_t) +/** + * Max allowable size (in bytes) of each element in the defer queue + */ +#define RTE_QSBR_ESIZE_MAX (2 * RTE_CACHE_LINE_MIN_SIZE) + /* RTE Quiescent State variable structure. * This structure has two elements that vary in size based on the * 'max_threads' parameter. -- 2.47.0.vfs.0.3