net: xdp: report flags program was installed with on query

Some drivers enforce that flags on program replacement and
removal must match the flags passed on install.  This leaves
the possibility open to enable simultaneous loading
of XDP programs both to HW and DRV.

Allow such drivers to report the flags back to the stack.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 1a603fd..ea6bbf1 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -3392,6 +3392,7 @@ static int nfp_net_xdp(struct net_device *netdev, struct netdev_bpf *xdp)
                if (nn->dp.bpf_offload_xdp)
                        xdp->prog_attached = XDP_ATTACHED_HW;
                xdp->prog_id = nn->xdp_prog ? nn->xdp_prog->aux->id : 0;
+               xdp->flags = nn->xdp_prog ? nn->xdp_flags : 0;
                return 0;
        case BPF_OFFLOAD_VERIFIER_PREP:
                return nfp_app_bpf_verifier_prep(nn->app, nn, xdp);

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 667bdd3..cc4ce74 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -820,6 +820,8 @@ struct netdev_bpf {
                struct {
                        u8 prog_attached;
                        u32 prog_id;
+                       /* flags with which program was installed */
+                       u32 prog_flags;
                };
                /* BPF_OFFLOAD_VERIFIER_PREP */
                struct {