From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754116AbeDWFhl (ORCPT ); Mon, 23 Apr 2018 01:37:41 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:60456 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752968AbeDWFf2 (ORCPT ); Mon, 23 Apr 2018 01:35:28 -0400 From: Jason Wang To: mst@redhat.com, jasowang@redhat.com Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, tiwei.bie@intel.com, jfreimann@redhat.com, wexu@redhat.com Subject: [RFC V3 PATCH 4/8] vhost_net: do not explicitly manipulate vhost_used_elem Date: Mon, 23 Apr 2018 13:34:56 +0800 Message-Id: <1524461700-5469-5-git-send-email-jasowang@redhat.com> In-Reply-To: <1524461700-5469-1-git-send-email-jasowang@redhat.com> References: <1524461700-5469-1-git-send-email-jasowang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 3826f1f..30273ad 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -341,9 +341,10 @@ 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 @@ -542,10 +543,8 @@ 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 24f3013..5cc1cdb 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2099,11 +2099,19 @@ 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 8dea44b..604821b 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 *); -- 2.7.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [RFC V3 PATCH 4/8] vhost_net: do not explicitly manipulate vhost_used_elem Date: Mon, 23 Apr 2018 13:34:56 +0800 Message-ID: <1524461700-5469-5-git-send-email-jasowang@redhat.com> References: <1524461700-5469-1-git-send-email-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, wexu@redhat.com To: mst@redhat.com, jasowang@redhat.com Return-path: In-Reply-To: <1524461700-5469-1-git-send-email-jasowang@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org 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 3826f1f..30273ad 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -341,9 +341,10 @@ 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 @@ -542,10 +543,8 @@ 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 24f3013..5cc1cdb 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2099,11 +2099,19 @@ 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 8dea44b..604821b 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 *); -- 2.7.4