Hi,
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index a1c76836d798..46cd1807f8e3 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -1040,13 +1040,98 @@ int virtio_transport_shutdown(struct vsock_sock *vsk, int mode)
> }
> EXPORT_SYMBOL_GPL(virtio_transport_shutdown);
>
> +static int virtio_transport_dgram_send_pkt_info(struct vsock_sock *vsk,
> + struct virtio_vsock_pkt_info *info)
> +{
> + u32 src_cid, src_port, dst_cid, dst_port;
> + const struct vsock_transport *transport;
> + const struct virtio_transport *t_ops;
> + struct sock *sk = sk_vsock(vsk);
> + struct virtio_vsock_hdr *hdr;
> + struct sk_buff *skb;
> + void *payload;
> + int noblock = 0;
> + int err;
> +
> + info->type = virtio_transport_get_type(sk_vsock(vsk));
> +
> + if (info->pkt_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE)
> + return -EMSGSIZE;
Small suggestion, i think we can check for packet length earlier ? Before
info->type = ...
> +
> + transport = vsock_dgram_lookup_transport(info->remote_cid, info->remote_flags);
> + t_ops = container_of(transport, struct virtio_transport, transport);
> + if (unlikely(!t_ops))
> + return -EFAULT;
> +
> + if (info->msg)
> + noblock = info->msg->msg_flags & MSG_DONTWAIT;
> +
> + /* Use sock_alloc_send_skb to throttle by sk_sndbuf. This helps avoid
> + * triggering the OOM.
> + */
> + skb = sock_alloc_send_skb(sk, info->pkt_len + VIRTIO_VSOCK_SKB_HEADROOM,
> + noblock, &err);
> + if (!skb)
> + return err;
> +
> + skb_reserve(skb, VIRTIO_VSOCK_SKB_HEADROOM);
> +
> + src_cid = t_ops->transport.get_local_cid();
> + src_port = vsk->local_addr.svm_port;
> + dst_cid = info->remote_cid;
> + dst_port = info->remote_port;
> +
> + hdr = virtio_vsock_hdr(skb);
> + hdr->type = cpu_to_le16(info->type);
> + hdr->op = cpu_to_le16(info->op);
> + hdr->src_cid = cpu_to_le64(src_cid);
> + hdr->dst_cid = cpu_to_le64(dst_cid);
> + hdr->src_port = cpu_to_le32(src_port);
> + hdr->dst_port = cpu_to_le32(dst_port);
> + hdr->flags = cpu_to_le32(info->flags);
> + hdr->len = cpu_to_le32(info->pkt_len);
There is function 'virtio_transport_init_hdr()' in this file, may be reuse it ?
> +
> + if (info->msg && info->pkt_len > 0) {
If pkt_len is 0, do we really need to send such packets ? Because for connectible
sockets, we ignore empty OP_RW packets.
> + payload = skb_put(skb, info->pkt_len);
> + err = memcpy_from_msg(payload, info->msg, info->pkt_len);
> + if (err)
> + goto out;
> + }
> +
> + trace_virtio_transport_alloc_pkt(src_cid, src_port,
> + dst_cid, dst_port,
> + info->pkt_len,
> + info->type,
> + info->op,
> + info->flags,
> + false);
^^^ For SOCK_DGRAM, include/trace/events/vsock_virtio_transport_common.h also should
be updated?
> +
> + return t_ops->send_pkt(skb);
> +out:
> + kfree_skb(skb);
> + return err;
> +}
> +
> int
> virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
> struct sockaddr_vm *remote_addr,
> struct msghdr *msg,
> size_t dgram_len)
> {
> - return -EOPNOTSUPP;
> + /* Here we are only using the info struct to retain style uniformity
> + * and to ease future refactoring and merging.
> + */
> + struct virtio_vsock_pkt_info info = {
> + .op = VIRTIO_VSOCK_OP_RW,
> + .remote_cid = remote_addr->svm_cid,
> + .remote_port = remote_addr->svm_port,
> + .remote_flags = remote_addr->svm_flags,
> + .msg = msg,
> + .vsk = vsk,
> + .pkt_len = dgram_len,
> + };
> +
> + return virtio_transport_dgram_send_pkt_info(vsk, &info);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue);
>
> --
> 2.20.1
Thanks, Arseniy
