netdev - Re: [PATCH bpf-next 2/7] drivers: net: turn on XDP features

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Date:   Sun, 22 Jan 2023 12:49:20 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        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
Subject: Re: [PATCH bpf-next 2/7] drivers: net: turn on XDP features

> On Fri, 20 Jan 2023 18:16:51 +0100 Lorenzo Bianconi wrote:
> > +static inline void
> > +xdp_features_set_redirect_target(xdp_features_t *xdp_features, bool support_sg)
> > +{
> > +	*xdp_features |= NETDEV_XDP_ACT_NDO_XMIT;
> > +	if (support_sg)
> > +		*xdp_features |= NETDEV_XDP_ACT_NDO_XMIT_SG;
> > +}
> > +
> > +static inline void
> > +xdp_features_clear_redirect_target(xdp_features_t *xdp_features)
> > +{
> > +	*xdp_features &= ~(NETDEV_XDP_ACT_NDO_XMIT |
> > +			   NETDEV_XDP_ACT_NDO_XMIT_SG);
> > +}
> > +
> 
> Shouldn't these generate netlink notifications?

ack, I would say we need to add NETDEV_XDP_FEAT_CHANGE case in
netdev_genl_netdevice_event routine and maybe add a new
NETDEV_XDP_FEAT_CHANGE flag in netdev_cmd. What do you think?

Regards,
Lorenzo

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