From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Mon, 20 Nov 2017 15:21:57 -0800
Subject: bpf: offload: ignore namespace moves
Patch-mainline: v4.15-rc1
Git-commit: 62c71b45e8537b8cb746cc929ea05ba0258e0b5a
References: bsc#1109837

We are currently destroying the device offload state when device
moves to another net namespace.  This doesn't break with current
NFP code, because offload state is not used on program removal,
but it's not correct behaviour.

Ignore the device unregister notifications on namespace move.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 kernel/bpf/offload.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -174,6 +174,10 @@ static int bpf_offload_notification(stru
 
 	switch (event) {
 	case NETDEV_UNREGISTER:
+		/* ignore namespace changes */
+		if (netdev->reg_state != NETREG_UNREGISTERING)
+			break;
+
 		list_for_each_entry_safe(offload, tmp, &bpf_prog_offload_devs,
 					 offloads) {
 			if (offload->netdev == netdev)