From: Tiwei Bie <tiwei.bie@intel.com>
To: mst@redhat.com, jasowang@redhat.com,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
virtio-dev@lists.oasis-open.org
Cc: wexu@redhat.com, jfreimann@redhat.com,
maxime.coquelin@redhat.com, tiwei.bie@intel.com
Subject: [PATCH net-next v3 09/13] virtio_ring: cache whether we will use DMA API
Date: Wed, 21 Nov 2018 18:03:26 +0800 [thread overview]
Message-ID: <20181121100330.24846-10-tiwei.bie@intel.com> (raw)
In-Reply-To: <20181121100330.24846-1-tiwei.bie@intel.com>
Cache whether we will use DMA API, instead of doing the
check every time. We are going to check whether DMA API
is used more often in packed ring.
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
drivers/virtio/virtio_ring.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index d00a87909a7e..aafe1969b45e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -86,6 +86,9 @@ struct vring_desc_state_split {
struct vring_virtqueue {
struct virtqueue vq;
+ /* Is DMA API used? */
+ bool use_dma_api;
+
/* Can we use weak barriers? */
bool weak_barriers;
@@ -262,7 +265,7 @@ static dma_addr_t vring_map_one_sg(const struct vring_virtqueue *vq,
struct scatterlist *sg,
enum dma_data_direction direction)
{
- if (!vring_use_dma_api(vq->vq.vdev))
+ if (!vq->use_dma_api)
return (dma_addr_t)sg_phys(sg);
/*
@@ -279,7 +282,7 @@ static dma_addr_t vring_map_single(const struct vring_virtqueue *vq,
void *cpu_addr, size_t size,
enum dma_data_direction direction)
{
- if (!vring_use_dma_api(vq->vq.vdev))
+ if (!vq->use_dma_api)
return (dma_addr_t)virt_to_phys(cpu_addr);
return dma_map_single(vring_dma_dev(vq),
@@ -289,7 +292,7 @@ static dma_addr_t vring_map_single(const struct vring_virtqueue *vq,
static int vring_mapping_error(const struct vring_virtqueue *vq,
dma_addr_t addr)
{
- if (!vring_use_dma_api(vq->vq.vdev))
+ if (!vq->use_dma_api)
return 0;
return dma_mapping_error(vring_dma_dev(vq), addr);
@@ -305,7 +308,7 @@ static void vring_unmap_one_split(const struct vring_virtqueue *vq,
{
u16 flags;
- if (!vring_use_dma_api(vq->vq.vdev))
+ if (!vq->use_dma_api)
return;
flags = virtio16_to_cpu(vq->vq.vdev, desc->flags);
@@ -1202,6 +1205,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
vq->broken = false;
vq->last_used_idx = 0;
vq->num_added = 0;
+ vq->use_dma_api = vring_use_dma_api(vdev);
list_add_tail(&vq->vq.list, &vdev->vqs);
#ifdef DEBUG
vq->in_use = false;
--
2.14.5
next prev parent reply other threads:[~2018-11-21 10:05 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-21 10:03 [PATCH net-next v3 00/13] virtio: support packed ring Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 01/13] virtio: add packed ring types and macros Tiwei Bie
2018-11-30 8:10 ` Jason Wang
2018-11-30 9:53 ` Tiwei Bie
2018-11-30 12:47 ` Michael S. Tsirkin
2018-11-30 13:01 ` Maxime Coquelin
2018-11-30 13:52 ` Michael S. Tsirkin
2018-11-30 15:37 ` Tiwei Bie
2018-11-30 15:53 ` Michael S. Tsirkin
2018-11-30 16:24 ` Tiwei Bie
2018-11-30 16:46 ` Michael S. Tsirkin
2018-12-01 2:03 ` Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 02/13] virtio_ring: add _split suffix for split ring functions Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 03/13] virtio_ring: put split ring functions together Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 04/13] virtio_ring: put split ring fields in a sub struct Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 05/13] virtio_ring: introduce debug helpers Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 06/13] virtio_ring: introduce helper for indirect feature Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 07/13] virtio_ring: allocate desc state for split ring separately Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 08/13] virtio_ring: extract split ring handling from ring creation Tiwei Bie
2018-11-21 10:03 ` Tiwei Bie [this message]
2018-11-21 10:03 ` [PATCH net-next v3 10/13] virtio_ring: introduce packed ring support Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 11/13] virtio_ring: leverage event idx in packed ring Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 12/13] virtio_ring: disable packed ring on unsupported transports Tiwei Bie
2018-11-21 10:03 ` [PATCH net-next v3 13/13] virtio_ring: advertize packed ring layout Tiwei Bie
2018-11-21 12:20 ` [PATCH net-next v3 00/13] virtio: support packed ring Michael S. Tsirkin
2018-11-21 12:42 ` Tiwei Bie
2018-11-21 13:46 ` Jason Wang
2018-11-21 17:37 ` David Miller
2018-11-27 6:08 ` Michael S. Tsirkin
2018-11-27 6:18 ` David Miller
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