From: Petr Machata <petrm@nvidia.com>
Date: Thu, 28 Jan 2021 12:49:15 +0000 (+0100)
Subject: nexthop: Introduce to struct nh_grp_entry a per-type union
X-Git-Tag: v5.12-rc1~200^2~214^2~9
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b9bae61be46645aa3b8b5d79d5cdfabe55ae1507;p=thirdparty%2Fkernel%2Flinux.git

nexthop: Introduce to struct nh_grp_entry a per-type union

The values that a next-hop group needs to keep track of depend on the group
type. Introduce a union to separate fields specific to the mpath groups
from fields specific to other group types.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index 226930d66b637..d0e245b0635d9 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -66,7 +66,12 @@ struct nh_info {
 struct nh_grp_entry {
 	struct nexthop	*nh;
 	u8		weight;
-	atomic_t	upper_bound;
+
+	union {
+		struct {
+			atomic_t	upper_bound;
+		} mpath;
+	};
 
 	struct list_head nh_list;
 	struct nexthop	*nh_parent;  /* nexthop of group with this entry */
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index 43bb5f4513436..7a30df5aea755 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -689,7 +689,7 @@ static struct nexthop *nexthop_select_path_mp(struct nh_group *nhg, int hash)
 		struct nh_grp_entry *nhge = &nhg->nh_entries[i];
 		struct nh_info *nhi;
 
-		if (hash > atomic_read(&nhge->upper_bound))
+		if (hash > atomic_read(&nhge->mpath.upper_bound))
 			continue;
 
 		nhi = rcu_dereference(nhge->nh->nh_info);
@@ -924,7 +924,7 @@ static void nh_group_rebalance(struct nh_group *nhg)
 
 		w += nhge->weight;
 		upper_bound = DIV_ROUND_CLOSEST_ULL((u64)w << 31, total) - 1;
-		atomic_set(&nhge->upper_bound, upper_bound);
+		atomic_set(&nhge->mpath.upper_bound, upper_bound);
 	}
 }