From: Jason Wang <jasowang@redhat.com>
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,
jfreimann@redhat.com, wexu@redhat.com, tiwei.bie@intel.com
Subject: [RFC V4 PATCH 4/8] vhost_net: do not explicitly manipulate vhost_used_elem
Date: Wed, 16 May 2018 20:32:17 +0800 [thread overview]
Message-ID: <1526473941-16199-5-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1526473941-16199-1-git-send-email-jasowang@redhat.com>
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 <jasowang@redhat.com>
---
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 afd4119..2ef1859 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2064,11 +2064,19 @@ 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
next prev parent reply other threads:[~2018-05-16 12:34 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-16 12:32 [RFC V4 PATCH 0/8] Packed ring layout for vhost Jason Wang
2018-05-16 12:32 ` [RFC V4 PATCH 1/8] vhost: move get_rx_bufs to vhost.c Jason Wang
2018-05-16 12:32 ` [RFC V4 PATCH 2/8] vhost: hide used ring layout from device Jason Wang
2018-05-16 12:32 ` [RFC V4 PATCH 3/8] vhost: do not use vring_used_elem Jason Wang
2018-05-16 12:32 ` Jason Wang [this message]
2018-05-16 12:32 ` [RFC V4 PATCH 5/8] vhost: vhost_put_user() can accept metadata type Jason Wang
2018-05-16 12:32 ` [RFC V4 PATCH 6/8] virtio: introduce packed ring defines Jason Wang
2018-05-16 12:32 ` [RFC V4 PATCH 7/8] vhost: packed ring support Jason Wang
2018-05-22 16:54 ` Wei Xu
2018-05-23 1:39 ` Jason Wang
2018-05-23 7:17 ` Wei Xu
2018-05-23 8:57 ` Jason Wang
2018-05-16 12:32 ` [RFC V4 PATCH 8/8] vhost: event suppression for packed ring Jason Wang
2018-05-25 2:28 ` Jason Wang
2018-05-20 16:25 ` [RFC V4 PATCH 0/8] Packed ring layout for vhost Wei Xu
2018-05-21 2:33 ` Jason Wang
2018-05-21 12:25 ` Wei Xu
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