On Thu, 2016-06-30 at 15:58 +0000, Dexuan Cui wrote:
> Hyper-V Sockets (hv_sock) supplies a byte-stream based communication
> mechanism between the host and the guest. It's somewhat like TCP over
> VMBus, but the transportation layer (VMBus) is much simpler than IP.
trivia:
> diff --git a/include/net/af_hvsock.h b/include/net/af_hvsock.h
[]
> @@ -0,0 +1,59 @@
[]
> +#define sk_to_hvsock(__sk) ((struct hvsock_sock *)(__sk))
> +#define hvsock_to_sk(__hvsk) ((struct sock *)(__hvsk))
Might as well be static inlines
> +/* We send at most 4KB payload per VMBus packet. */
> +struct hvsock_send_buf {
> + struct vmpipe_proto_header hdr;
> + u8 buf[PAGE_SIZE];
PAGE_SIZE might not be the right define here if
the comment is to be believed.
> diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
[]
> @@ -396,4 +397,27 @@ struct hv_kvp_ip_msg {
> struct hv_kvp_ipaddr_value kvp_ip_val;
> } __attribute__((packed));
>
> +/* This is the address fromat of Hyper-V Sockets.
format
> diff --git a/net/hv_sock/af_hvsock.c b/net/hv_sock/af_hvsock.c
[]
> @@ -0,0 +1,1519 @@
> +/*
> + * Hyper-V Sockets -- a socket-based communication channel between the
> + * Hyper-V host and the virtual machines running on it.
> + *
> + * Copyright(c) 2016, Microsoft Corporation. All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + *
> + * 1. Redistributions of source code must retain the above copyright
> + * notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + * 3. The name of the author may not be used to endorse or promote
> + * products derived from this software without specific prior written
> + * permission.
> + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
> + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
> + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
> + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
> + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
> + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
Is this license GPL compatible?
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include
> +#include
> +#include
> +#include
> +
> +static struct proto hvsock_proto = {
> + .name = "HV_SOCK",
> + .owner = THIS_MODULE,
> + .obj_size = sizeof(struct hvsock_sock),
> +};
const?
> +static int hvsock_recvmsg_wait(struct sock *sk, struct msghdr *msg,
> + size_t len, int flags)
> +{
[]
> + if (ret != 0 || payload_len >
> + sizeof(hvsk->recv->buf)) {
This could look nicer as
if (ret != 0 ||
payload_len > sizeof(hvsk->recv->buf)) {
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