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vsock/virtio: non-linear skb handling for tap

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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 <avkrasnov@salutedevices.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Arseniy Krasnov 2023-09-16 16:09:17 +03:00 committed by Paolo Abeni
parent 64c99d2d6a
commit 4b0bf10eb0
1 changed files with 28 additions and 3 deletions
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31
net/vmw_vsock/virtio_transport_common.c
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@ -106,6 +106,27 @@ out:
return NULL;
}
static void virtio_transport_copy_nonlinear_skb(const struct sk_buff *skb,
void *dst,
size_t len)
{
struct iov_iter iov_iter = { 0 };
struct kvec kvec;
size_t to_copy;
kvec.iov_base = dst;
kvec.iov_len = len;
iov_iter.iter_type = ITER_KVEC;
iov_iter.kvec = &kvec;
iov_iter.nr_segs = 1;
to_copy = min_t(size_t, len, skb->len);
skb_copy_datagram_iter(skb, VIRTIO_VSOCK_SKB_CB(skb)->offset,
&iov_iter, to_copy);
}
/* Packet capture */
static struct sk_buff *virtio_transport_build_skb(void *opaque)
{
@ -114,7 +135,6 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
struct af_vsockmon_hdr *hdr;
struct sk_buff *skb;
size_t payload_len;
void *payload_buf;
/* A packet could be split to fit the RX buffer, so we can retrieve
* the payload length from the header and the buffer pointer taking
@ -122,7 +142,6 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
*/
pkt_hdr = virtio_vsock_hdr(pkt);
payload_len = pkt->len;
payload_buf = pkt->data;
skb = alloc_skb(sizeof(*hdr) + sizeof(*pkt_hdr) + payload_len,
GFP_ATOMIC);
@ -165,7 +184,13 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
skb_put_data(skb, pkt_hdr, sizeof(*pkt_hdr));
if (payload_len) {
skb_put_data(skb, payload_buf, payload_len);
if (skb_is_nonlinear(pkt)) {
void *data = skb_put(skb, payload_len);
virtio_transport_copy_nonlinear_skb(pkt, data, payload_len);
} else {
skb_put_data(skb, pkt->data, payload_len);
}
}
return skb;