From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
To: virtualization@lists.linux-foundation.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>
Subject: [PATCH vhost v12 04/10] virtio_ring: support add premapped buf
Date: Wed, 19 Jul 2023 12:04:16 +0800 [thread overview]
Message-ID: <20230719040422.126357-5-xuanzhuo@linux.alibaba.com> (raw)
In-Reply-To: <20230719040422.126357-1-xuanzhuo@linux.alibaba.com>
If the vq is the premapped mode, use the sg_dma_address() directly.
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
drivers/virtio/virtio_ring.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 8e81b01e0735..f9f772e85a38 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -361,6 +361,11 @@ static struct device *vring_dma_dev(const struct vring_virtqueue *vq)
static int vring_map_one_sg(const struct vring_virtqueue *vq, struct scatterlist *sg,
enum dma_data_direction direction, dma_addr_t *addr)
{
+ if (vq->premapped) {
+ *addr = sg_dma_address(sg);
+ return 0;
+ }
+
if (!vq->use_dma_api) {
/*
* If DMA is not used, KMSAN doesn't know that the scatterlist
@@ -639,8 +644,12 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
dma_addr_t addr = vring_map_single(
vq, desc, total_sg * sizeof(struct vring_desc),
DMA_TO_DEVICE);
- if (vring_mapping_error(vq, addr))
+ if (vring_mapping_error(vq, addr)) {
+ if (vq->premapped)
+ goto free_indirect;
+
goto unmap_release;
+ }
virtqueue_add_desc_split(_vq, vq->split.vring.desc,
head, addr,
@@ -706,6 +715,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
i = vring_unmap_one_split(vq, i);
}
+free_indirect:
if (indirect)
kfree(desc);
@@ -1307,8 +1317,12 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
addr = vring_map_single(vq, desc,
total_sg * sizeof(struct vring_packed_desc),
DMA_TO_DEVICE);
- if (vring_mapping_error(vq, addr))
+ if (vring_mapping_error(vq, addr)) {
+ if (vq->premapped)
+ goto free_desc;
+
goto unmap_release;
+ }
vq->packed.vring.desc[head].addr = cpu_to_le64(addr);
vq->packed.vring.desc[head].len = cpu_to_le32(total_sg *
@@ -1366,6 +1380,7 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
for (i = 0; i < err_idx; i++)
vring_unmap_desc_packed(vq, &desc[i]);
+free_desc:
kfree(desc);
END_USE(vq);
--
2.32.0.3.g01195cf9f
next prev parent reply other threads:[~2023-07-19 4:04 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-19 4:04 [PATCH vhost v12 00/10] virtio core prepares for AF_XDP Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 01/10] virtio_ring: check use_dma_api before unmap desc for indirect Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 02/10] virtio_ring: put mapping error check in vring_map_one_sg Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 03/10] virtio_ring: introduce virtqueue_set_dma_premapped() Xuan Zhuo
2023-07-19 4:04 ` Xuan Zhuo [this message]
2023-07-19 4:04 ` [PATCH vhost v12 05/10] virtio_ring: introduce virtqueue_dma_dev() Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 06/10] virtio_ring: skip unmap for premapped Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 07/10] virtio_ring: correct the expression of the description of virtqueue_resize() Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 08/10] virtio_ring: separate the logic of reset/enable from virtqueue_resize Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 09/10] virtio_ring: introduce virtqueue_reset() Xuan Zhuo
2023-07-19 4:04 ` [PATCH vhost v12 10/10] virtio_net: merge dma operations when filling mergeable buffers Xuan Zhuo
2023-07-19 10:33 ` kernel test robot
2023-07-19 11:05 ` Michael S. Tsirkin
2023-07-20 2:31 ` Xuan Zhuo
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