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 5EEC5A0542; Wed, 5 Oct 2022 17:12:50 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E8BB640694; Wed, 5 Oct 2022 17:12:49 +0200 (CEST) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mails.dpdk.org (Postfix) with ESMTP id 5F4CB40143 for ; Wed, 5 Oct 2022 17:12:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1664982767; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=XkN/+FdoUUsD18vD46YU+dPytjLdwQJpGxLvklvfd8c=; b=fofz2/EQuG0Ay7gg/JoVs4yn3acbLTpJZDqlwr5gCaRATQ52DqstVkHVRVw1/7tFRjJKrb kj3uNGziBZP4E2zZhfAW6g91UzkfFaKnNKXWece4jRIM3ceMTWNxF2mq9Mpvd4DT7RAS5C xZsf9di5HJ6h6qkqLPk8jNaJCaSwbz8= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-609-N_IH7GJVODaQAzJmi9dshA-1; Wed, 05 Oct 2022 11:12:45 -0400 X-MC-Unique: N_IH7GJVODaQAzJmi9dshA-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 50C851C06EF7; Wed, 5 Oct 2022 15:12:14 +0000 (UTC) Received: from max-t490s.redhat.com (unknown [10.39.208.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 302BE492B05; Wed, 5 Oct 2022 15:12:05 +0000 (UTC) From: Maxime Coquelin To: dev@dpdk.org, cheng1.jiang@intel.com, chenbo.xia@intel.com, zhoumin@loongson.cn, david.marchand@redhat.com, thomas@monjalon.net Cc: Maxime Coquelin , stable@dpdk.org Subject: [PATCH v2] vhost: fix compilation issue in async path Date: Wed, 5 Oct 2022 17:11:59 +0200 Message-Id: <20221005151159.72366-1-maxime.coquelin@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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 This patch fixes a compilation issue met with GCC 12 on LoongArch64: In function ‘mbuf_to_desc’, inlined from ‘vhost_enqueue_async_packed’ at ../../../dpdk/lib/vhost/virtio_net.c:1822:6, inlined from ‘virtio_dev_rx_async_packed’ at ../../../dpdk/lib/vhost/virtio_net.c:1836:6, inlined from ‘virtio_dev_rx_async_submit_packed’ at ../../../dpdk/lib/vhost/virtio_net.c:1895:7: ../../../dpdk/lib/vhost/virtio_net.c:1159:18: error: ‘buf_vec[0].buf_addr’ may be used uninitialized [-Werror=maybe-uninitialized] 1159 | buf_addr = buf_vec[vec_idx].buf_addr; | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ ../../../dpdk/lib/vhost/virtio_net.c: In function ‘virtio_dev_rx_async_submit_packed’: ../../../dpdk/lib/vhost/virtio_net.c:1834:27: note: ‘buf_vec’ declared here 1834 | struct buf_vector buf_vec[BUF_VECTOR_MAX]; | ^~~~~~~ It happens because the compiler assumes that 'size' variable in vhost_enqueue_async_packed could wrap to 0 since 'size' is uint32_t and pkt->pkt_len too. In practice, it would never happen since 'pkt->pkt_len' is unlikely to be close to UINT32_MAX, but let's just change 'size' to uint64_t to make the compiler happy without having to add runtime checks. Fixes: 873e8dad6f49 ("vhost: support packed ring in async datapath") Cc: stable@dpdk.org Signed-off-by: Maxime Coquelin --- lib/vhost/virtio_net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c index 8f4d0f0502..b86fb26040 100644 --- a/lib/vhost/virtio_net.c +++ b/lib/vhost/virtio_net.c @@ -1780,7 +1780,7 @@ vhost_enqueue_async_packed(struct virtio_net *dev, uint16_t buf_id = 0; uint32_t len = 0; uint16_t desc_count = 0; - uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf); + uint64_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf); uint32_t buffer_len[vq->size]; uint16_t buffer_buf_id[vq->size]; uint16_t buffer_desc_count[vq->size]; -- 2.37.3