netdev - Re: [PATCH bpf-next 6/7] bpf: devmap: check XDP features in bpf_map_update_elem and __xdp

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Date:   Sun, 22 Jan 2023 13:13:41 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, davem@...emloft.net, kuba@...nel.org,
        hawk@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
        toke@...hat.com, memxor@...il.com, alardam@...il.com,
        saeedm@...dia.com, anthony.l.nguyen@...el.com, gospo@...adcom.com,
        vladimir.oltean@....com, nbd@....name, john@...ozen.org,
        leon@...nel.org, simon.horman@...igine.com, aelior@...vell.com,
        christophe.jaillet@...adoo.fr, ecree.xilinx@...il.com,
        mst@...hat.com, bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, intel-wired-lan@...ts.osuosl.org,
        lorenzo.bianconi@...hat.com, niklas.soderlund@...igine.com,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next 6/7] bpf: devmap: check XDP features in
 bpf_map_update_elem and __xdp_enqueue

> On 1/20/23 9:16 AM, Lorenzo Bianconi wrote:
> > ---
> >   kernel/bpf/devmap.c | 25 +++++++++++++++++++++----
> >   net/core/filter.c   | 13 +++++--------
> >   2 files changed, 26 insertions(+), 12 deletions(-)
> > 
> > diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
> > index d01e4c55b376..69ceecc792df 100644
> > --- a/kernel/bpf/devmap.c
> > +++ b/kernel/bpf/devmap.c
> > @@ -474,7 +474,11 @@ static inline int __xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
> >   {
> >   	int err;
> > -	if (!dev->netdev_ops->ndo_xdp_xmit)
> > +	if (!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT))
> 
> The current "dev->netdev_ops->ndo_xdp_xmit" check is self explaining.
> Any plan to put some document for the NETDEV_XDP_ACT_* values?
> 

I am not a yaml description expert but I guess we can xdp features description
in Documentation/netlink/specs/netdev.yaml.

@Jakub: what do you think?

Regards,
Lorenzo

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