On 2018/11/6 下午2:41, jiangyiwen wrote:
On 2018/11/6 12:00, Jason Wang wrote:
On 2018/11/5 下午3:47, jiangyiwen wrote:
Guest receive mergeable rx buffer, it can merge
scatter rx buffer into a big buffer and then copy
to user space.
Signed-off-by: Yiwen Jiang<jiangyiwen@xxxxxxxxxx>
---
include/linux/virtio_vsock.h | 9 ++++
net/vmw_vsock/virtio_transport.c | 75 +++++++++++++++++++++++++++++----
net/vmw_vsock/virtio_transport_common.c | 59 ++++++++++++++++++++++----
3 files changed, 127 insertions(+), 16 deletions(-)
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index da9e1fe..6be3cd7 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -13,6 +13,8 @@
#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4)
#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL
#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64)
+/* virtio_vsock_pkt + max_pkt_len(default MAX_PKT_BUF_SIZE) */
+#define VIRTIO_VSOCK_MAX_MRG_BUF_NUM ((VIRTIO_VSOCK_MAX_PKT_BUF_SIZE / PAGE_SIZE) + 1)
/* Virtio-vsock feature */
#define VIRTIO_VSOCK_F_MRG_RXBUF 0 /* Host can merge receive buffers. */
@@ -48,6 +50,11 @@ struct virtio_vsock_sock {
struct list_head rx_queue;
};
+struct virtio_vsock_mrg_rxbuf {
+ void *buf;
+ u32 len;
+};
+
struct virtio_vsock_pkt {
struct virtio_vsock_hdr hdr;
struct virtio_vsock_mrg_rxbuf_hdr mrg_rxbuf_hdr;
@@ -59,6 +66,8 @@ struct virtio_vsock_pkt {
u32 len;
u32 off;
bool reply;
+ bool mergeable;
+ struct virtio_vsock_mrg_rxbuf mrg_rxbuf[VIRTIO_VSOCK_MAX_MRG_BUF_NUM];
};
It's better to use iov here I think, and drop buf completely.
And this is better to be done in an independent patch.
You're right, I can use kvec instead of customized structure,
in addition, I don't understand about drop buf completely and
an independent patch.
I mean there a void *buf in struct virtio_vsock_pkt. You can drop it and
switch to use iov(iter) or other data structure that supports sg.
Thanks
Thanks.
