From patchwork Mon Mar 26 03:38:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 10307069 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0C9E760353 for ; Mon, 26 Mar 2018 03:41:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F21CC29460 for ; Mon, 26 Mar 2018 03:41:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F0E622947B; Mon, 26 Mar 2018 03:41:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A8EC29460 for ; Mon, 26 Mar 2018 03:41:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752206AbeCZDjq (ORCPT ); Sun, 25 Mar 2018 23:39:46 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:46708 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751074AbeCZDjp (ORCPT ); Sun, 25 Mar 2018 23:39:45 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 565EB722C5; Mon, 26 Mar 2018 03:39:44 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (ovpn-12-110.pek2.redhat.com [10.72.12.110]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6B393111DD01; Mon, 26 Mar 2018 03:39:35 +0000 (UTC) From: Jason Wang To: mst@redhat.com, virtualization@lists.linux-foundation.org Cc: kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jason Wang Subject: [RFC PATCH V2 4/8] vhost_net: do not explicitly manipulate vhost_used_elem Date: Mon, 26 Mar 2018 11:38:49 +0800 Message-Id: <1522035533-11786-5-git-send-email-jasowang@redhat.com> In-Reply-To: <1522035533-11786-1-git-send-email-jasowang@redhat.com> References: <1522035533-11786-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Mon, 26 Mar 2018 03:39:44 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Mon, 26 Mar 2018 03:39:44 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'jasowang@redhat.com' RCPT:'' Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Two helpers of setting/getting used len were introduced to avoid explicitly manipulating vhost_used_elem in zerocopy code. This will be used to hide used_elem internals and simplify packed ring implementation. Signed-off-by: Jason Wang --- drivers/vhost/net.c | 11 +++++------ drivers/vhost/vhost.c | 12 ++++++++++-- drivers/vhost/vhost.h | 5 +++++ 3 files changed, 20 insertions(+), 8 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 7ea2aee..7be8b55 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -337,9 +337,10 @@ static void vhost_zerocopy_signal_used(struct vhost_net *net, int j = 0; for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { - if (vq->heads[i].elem.len == VHOST_DMA_FAILED_LEN) + if (vhost_get_used_len(vq, &vq->heads[i]) == + VHOST_DMA_FAILED_LEN) vhost_net_tx_err(net); - if (VHOST_DMA_IS_DONE(vq->heads[i].elem.len)) { + if (VHOST_DMA_IS_DONE(vhost_get_used_len(vq, &vq->heads[i]))) { vq->heads[i].elem.len = VHOST_DMA_CLEAR_LEN; ++j; } else @@ -537,10 +538,8 @@ static void handle_tx(struct vhost_net *net) struct ubuf_info *ubuf; ubuf = nvq->ubuf_info + nvq->upend_idx; - vq->heads[nvq->upend_idx].elem.id = - cpu_to_vhost32(vq, used.elem.id); - vq->heads[nvq->upend_idx].elem.len = - VHOST_DMA_IN_PROGRESS; + vhost_set_used_len(vq, &used, VHOST_DMA_IN_PROGRESS); + vq->heads[nvq->upend_idx] = used; ubuf->callback = vhost_zerocopy_callback; ubuf->ctx = nvq->ubufs; ubuf->desc = nvq->upend_idx; diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 8744dae..65954d6 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2100,11 +2100,19 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq, } EXPORT_SYMBOL_GPL(vhost_get_vq_desc); -static void vhost_set_used_len(struct vhost_virtqueue *vq, - struct vhost_used_elem *used, int len) +void vhost_set_used_len(struct vhost_virtqueue *vq, + struct vhost_used_elem *used, int len) { used->elem.len = cpu_to_vhost32(vq, len); } +EXPORT_SYMBOL_GPL(vhost_set_used_len); + +int vhost_get_used_len(struct vhost_virtqueue *vq, + struct vhost_used_elem *used) +{ + return vhost32_to_cpu(vq, used->elem.len); +} +EXPORT_SYMBOL_GPL(vhost_get_used_len); /* This is a multi-buffer version of vhost_get_desc, that works if * vq has read descriptors only. diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 8399887..d57c875 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -198,6 +198,11 @@ int vhost_get_bufs(struct vhost_virtqueue *vq, unsigned *log_num, unsigned int quota, s16 *count); +void vhost_set_used_len(struct vhost_virtqueue *vq, + struct vhost_used_elem *used, + int len); +int vhost_get_used_len(struct vhost_virtqueue *vq, + struct vhost_used_elem *used); void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); int vhost_vq_init_access(struct vhost_virtqueue *);