From: Yotam Gigi <yotamg@mellanox.com>
Date: Wed, 27 Sep 2017 08:23:15 +0200
Subject: net: ipmr: Add MFC offload indication
Patch-mainline: v4.15-rc1
Git-commit: c7c0bbeae9501a7e42f2fd306d6a6399aca688b6
References: bsc#1112374

Allow drivers, registered to the fib notification chain indicate whether a
multicast MFC route is offloaded or not, similarly to unicast routes. The
indication of whether a route is offloaded is done using the mfc_flags
field on an mfc_cache struct, and the information is sent to the userspace
via the RTNetlink interface only.

Currently, MFC routes are either offloaded or not, thus there is no need to
add per-VIF offload indication.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/linux/mroute.h |    2 ++
 net/ipv4/ipmr.c        |    3 +++
 2 files changed, 5 insertions(+)

--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h
@@ -90,9 +90,11 @@ struct mr_table {
 
 /* mfc_flags:
  * MFC_STATIC - the entry was added statically (not by a routing daemon)
+ * MFC_OFFLOAD - the entry was offloaded to the hardware
  */
 enum {
 	MFC_STATIC = BIT(0),
+	MFC_OFFLOAD = BIT(1),
 };
 
 struct mfc_cache_cmp_arg {
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2266,6 +2266,9 @@ static int __ipmr_fill_mroute(struct mr_
 	    nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
 		return -EMSGSIZE;
 
+	if (c->mfc_flags & MFC_OFFLOAD)
+		rtm->rtm_flags |= RTNH_F_OFFLOAD;
+
 	if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
 		return -EMSGSIZE;