On 22.05.2023 16:13, Simon Horman wrote:

On Mon, May 22, 2023 at 10:39:37AM +0300, Arseniy Krasnov wrote:

quoted

For tap device new skb is created and data from the current skb is
copied to it. This adds copying data from non-linear skb to new
the skb.

Signed-off-by: Arseniy Krasnov <redacted>
---
 net/vmw_vsock/virtio_transport_common.c | 31 ++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 16effa8d55d2..9854f48a0544 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c

@@ -106,6 +106,27 @@ virtio_transport_alloc_skb(struct virtio_vsock_pkt_info *info,
 	return NULL;
 }
 
+static void virtio_transport_copy_nonlinear_skb(struct sk_buff *skb,
+						void *dst,
+						size_t len)
+{
+	struct iov_iter iov_iter = { 0 };
+	struct iovec iovec;
+	size_t to_copy;
+
+	iovec.iov_base = dst;

Hi Arseniy,

Sparse seems unhappy about this.
Though, TBH, I'm unsure what should be done about it.

.../virtio_transport_common.c:117:24: warning: incorrect type in assignment (different address spaces)
.../virtio_transport_common.c:117:24:    expected void [noderef] __user *iov_base
.../virtio_transport_common.c:117:24:    got void *dst

Got it, i'll check how to resolve this problem!

Thanks!

...