net: nexthop: Have all NH notifiers carry NH ID

When sending the notifications to collect NH statistics for resilient
groups, the driver will need to know the nexthop IDs in individual buckets
to look up the right counter. To that end, move the nexthop ID from struct
nh_notifier_grp_entry_info to nh_notifier_single_info.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/8f964cd50b1a56d3606ce7ab4c50354ae019c43b.1709901020.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: pmachata

include/net/nexthop.h

@@ -185,14 +185,14 @@ struct nh_notifier_single_info {
 		__be32 ipv4;
 		struct in6_addr ipv6;
 	};
+	u32 id;
 	u8 is_reject:1,
 	   is_fdb:1,
 	   has_encap:1;
 };
 
 struct nh_notifier_grp_entry_info {
 	u8 weight;
-	u32 id;
 	struct nh_notifier_single_info nh;
 };
 

net/ipv4/nexthop.c

@@ -104,6 +104,7 @@ __nh_notifier_single_info_init(struct nh_notifier_single_info *nh_info,
 	else if (nh_info->gw_family == AF_INET6)
 		nh_info->ipv6 = nhi->fib_nhc.nhc_gw.ipv6;
 
+	nh_info->id = nhi->nh_parent->id;
 	nh_info->is_reject = nhi->reject_nh;
 	nh_info->is_fdb = nhi->fdb_nh;
 	nh_info->has_encap = !!nhi->fib_nhc.nhc_lwtstate;
@@ -150,7 +151,6 @@ static int nh_notifier_mpath_info_init(struct nh_notifier_info *info,
 		struct nh_info *nhi;
 
 		nhi = rtnl_dereference(nhge->nh->nh_info);
-		info->nh_grp->nh_entries[i].id = nhge->nh->id;
 		info->nh_grp->nh_entries[i].weight = nhge->weight;
 		__nh_notifier_single_info_init(&info->nh_grp->nh_entries[i].nh,
 					       nhi);