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Message-Id: <20231229073108.57778-9-xuanzhuo@linux.alibaba.com>
Date: Fri, 29 Dec 2023 15:30:49 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
virtualization@...ts.linux-foundation.org,
bpf@...r.kernel.org
Subject: [PATCH net-next v3 08/27] virtio_ring: introduce virtqueue_detach_unused_buf_dma()
introduce virtqueue_detach_unused_buf_dma() to collect the dma
info when get buf from virtio core for premapped mode.
If the virtio queue is premapped mode, the virtio-net send buf may
have many desc. Every desc dma address need to be unmap. So here we
introduce a new helper to collect the dma address of the buffer from
the virtio core.
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
drivers/virtio/virtio_ring.c | 33 +++++++++++++++++++++++++--------
include/linux/virtio.h | 1 +
2 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index b700d4e6e7dd..a2d6aea551a7 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1012,7 +1012,7 @@ static bool virtqueue_enable_cb_delayed_split(struct virtqueue *_vq)
return true;
}
-static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
+static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq, struct virtio_dma_head *dma)
{
struct vring_virtqueue *vq = to_vvq(_vq);
unsigned int i;
@@ -1025,7 +1025,7 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
continue;
/* detach_buf_split clears data, so grab it now. */
buf = vq->split.desc_state[i].data;
- detach_buf_split(vq, i, NULL, NULL);
+ detach_buf_split(vq, i, dma, NULL);
vq->split.avail_idx_shadow--;
vq->split.vring.avail->idx = cpu_to_virtio16(_vq->vdev,
vq->split.avail_idx_shadow);
@@ -1909,7 +1909,7 @@ static bool virtqueue_enable_cb_delayed_packed(struct virtqueue *_vq)
return true;
}
-static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
+static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq, struct virtio_dma_head *dma)
{
struct vring_virtqueue *vq = to_vvq(_vq);
unsigned int i;
@@ -1922,7 +1922,7 @@ static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
continue;
/* detach_buf clears data, so grab it now. */
buf = vq->packed.desc_state[i].data;
- detach_buf_packed(vq, i, NULL, NULL);
+ detach_buf_packed(vq, i, dma, NULL);
END_USE(vq);
return buf;
}
@@ -2614,19 +2614,36 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
EXPORT_SYMBOL_GPL(virtqueue_enable_cb_delayed);
/**
- * virtqueue_detach_unused_buf - detach first unused buffer
+ * virtqueue_detach_unused_buf_dma - detach first unused buffer
* @_vq: the struct virtqueue we're talking about.
+ * @dma: the head of the array to store the dma info
+ *
+ * more see virtqueue_get_buf_ctx_dma()
*
* Returns NULL or the "data" token handed to virtqueue_add_*().
* This is not valid on an active queue; it is useful for device
* shutdown or the reset queue.
*/
-void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
+void *virtqueue_detach_unused_buf_dma(struct virtqueue *_vq, struct virtio_dma_head *dma)
{
struct vring_virtqueue *vq = to_vvq(_vq);
- return vq->packed_ring ? virtqueue_detach_unused_buf_packed(_vq) :
- virtqueue_detach_unused_buf_split(_vq);
+ return vq->packed_ring ? virtqueue_detach_unused_buf_packed(_vq, dma) :
+ virtqueue_detach_unused_buf_split(_vq, dma);
+}
+EXPORT_SYMBOL_GPL(virtqueue_detach_unused_buf_dma);
+
+/**
+ * virtqueue_detach_unused_buf - detach first unused buffer
+ * @_vq: the struct virtqueue we're talking about.
+ *
+ * Returns NULL or the "data" token handed to virtqueue_add_*().
+ * This is not valid on an active queue; it is useful for device
+ * shutdown or the reset queue.
+ */
+void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
+{
+ return virtqueue_detach_unused_buf_dma(_vq, NULL);
}
EXPORT_SYMBOL_GPL(virtqueue_detach_unused_buf);
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 7a5e9ea7d420..2596f0e7e395 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -104,6 +104,7 @@ bool virtqueue_poll(struct virtqueue *vq, unsigned);
bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
void *virtqueue_detach_unused_buf(struct virtqueue *vq);
+void *virtqueue_detach_unused_buf_dma(struct virtqueue *_vq, struct virtio_dma_head *dma);
unsigned int virtqueue_get_vring_size(const struct virtqueue *vq);
--
2.32.0.3.g01195cf9f
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