Function read_vhost_message

dpdk/lib/vhost/vhost_user.c:2877–2915

return bytes# of read on success or negative val on failure. */

/* return bytes# of read on success or negative val on failure. */
static int
read_vhost_message(struct virtio_net *dev, int sockfd, struct  vhu_msg_context *ctx)
{
	int ret;

	ret = read_fd_message(dev->ifname, sockfd, (char *)&ctx->msg, VHOST_USER_HDR_SIZE,
		ctx->fds, VHOST_MEMORY_MAX_NREGIONS, &ctx->fd_num);
	if (ret <= 0)
		goto out;

	if (ret != VHOST_USER_HDR_SIZE) {
		VHOST_LOG_CONFIG(dev->ifname, ERR, "Unexpected header size read\n");
		ret = -1;
		goto out;
	}

	if (ctx->msg.size) {
		if (ctx->msg.size > sizeof(ctx->msg.payload)) {
			VHOST_LOG_CONFIG(dev->ifname, ERR, "invalid msg size: %d\n",
				ctx->msg.size);
			ret = -1;
			goto out;
		}
		ret = read(sockfd, &ctx->msg.payload, ctx->msg.size);
		if (ret <= 0)
			goto out;
		if (ret != (int)ctx->msg.size) {
			VHOST_LOG_CONFIG(dev->ifname, ERR, "read control message failed\n");
			ret = -1;
			goto out;
		}
	}

out:
	if (ret <= 0)
		close_msg_fds(ctx);

	return ret;
}

static int
send_vhost_message(struct virtio_net *dev, int sockfd, struct vhu_msg_context *ctx)