netdev - Re: [PATCH net-next V2 11/11] vhost_net: batch submitting XDP buffers to underlayer sockets

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Date:   Thu, 13 Sep 2018 14:04:59 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net-next V2 11/11] vhost_net: batch submitting XDP
 buffers to underlayer sockets

On Wed, Sep 12, 2018 at 11:17:09AM +0800, Jason Wang wrote:
> +static void vhost_tx_batch(struct vhost_net *net,
> +			   struct vhost_net_virtqueue *nvq,
> +			   struct socket *sock,
> +			   struct msghdr *msghdr)
> +{
> +	struct tun_msg_ctl ctl = {
> +		.type = TUN_MSG_PTR,
> +		.num = nvq->batched_xdp,
> +		.ptr = nvq->xdp,
> +	};
> +	int err;
> +
> +	if (nvq->batched_xdp == 0)
> +		goto signal_used;
> +
> +	msghdr->msg_control = &ctl;
> +	err = sock->ops->sendmsg(sock, msghdr, 0);
> +	if (unlikely(err < 0)) {
> +		vq_err(&nvq->vq, "Fail to batch sending packets\n");
> +		return;
> +	}
> +
> +signal_used:
> +	vhost_net_signal_used(nvq);
> +	nvq->batched_xdp = 0;
> +}
> +

Given it's all tun-specific now, how about just exporting tap_sendmsg
and calling that? Will get rid of some indirection too.

-- 
MST