netdev - [PATCH net-next 2/8] net: xdp: report flags program was installed with on query

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Message-Id: <20171130222853.29395-3-jakub.kicinski@netronome.com>
Date:   Thu, 30 Nov 2017 14:28:47 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, daniel@...earbox.net,
        alexei.starovoitov@...il.com, jiri@...nulli.us,
        oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 2/8] 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@...ronome.com>
Reviewed-by: Simon Horman <simon.horman@...ronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 1 +
 include/linux/netdevice.h                           | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 1a603fdd9e80..ea6bbf1efefc 100644
--- 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 667bdd3ad33e..cc4ce7456e38 100644
--- 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 {
-- 
2.14.1