netdev - Re: [PATCH v3 net-next RFC] Generic XDP

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Date:   Wed, 12 Apr 2017 23:48:22 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     David Miller <davem@...emloft.net>
Cc:     Netdev <netdev@...r.kernel.org>, xdp-newbies@...r.kernel.org
Subject: Re: [PATCH v3 net-next RFC] Generic XDP

On Wed, Apr 12, 2017 at 11:54 AM, David Miller <davem@...emloft.net> wrote:
>
> +static struct static_key generic_xdp_needed __read_mostly;
> +
> +static int generic_xdp_install(struct net_device *dev, struct netdev_xdp *xdp)
> +{
> +       struct bpf_prog *new = xdp->prog;
> +       int ret = 0;
> +
> +       switch (xdp->command) {
> +       case XDP_SETUP_PROG: {
> +               struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
> +
> +               rcu_assign_pointer(dev->xdp_prog, new);
> +               if (old)
> +                       bpf_prog_put(old);
> +
> +               if (old && !new)
> +                       static_key_slow_dec(&generic_xdp_needed);
> +               else if (new && !old)
> +                       static_key_slow_inc(&generic_xdp_needed);

I think we need to call dev_disable_lro(dev) to disable LRO also when
a BPF program is installed.

> +               break;
> +       }
> +
> +       case XDP_QUERY_PROG:
> +               xdp->prog_attached = !!rcu_access_pointer(dev->xdp_prog);
> +               break;
> +
> +       default:
> +               ret = -EINVAL;
> +               break;
> +       }
> +
> +       return ret;
> +}
> +