netdev - Re: [PATCH RFC 4/9] veth: Use NAPI for XDP

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Date:   Tue, 1 May 2018 09:50:21 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Toshiaki Makita <toshiaki.makita1@...il.com>
Cc:     brouer@...hat.com, netdev@...r.kernel.org,
        Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Subject: Re: [PATCH RFC 4/9] veth: Use NAPI for XDP

On Tue, 24 Apr 2018 23:39:18 +0900
Toshiaki Makita <toshiaki.makita1@...il.com> wrote:

> +static int veth_xdp_enqueue(struct veth_priv *priv, void *ptr)
> +{
> +	if (unlikely(ptr_ring_produce(&priv->xdp_ring, ptr)))
> +		return -ENOSPC;
> +
> +	return 0;
> +}

Here we have a lock per (enqueued) packet.  I'm working on changing the
ndo_xdp_xmit API to allow bulking.  And the tun driver have exact same
issue/need.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer