linux-kernel - [PATCH net-next v2 1/4] nexthop: Factor out hash threshold fdb nexthop selection

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Message-ID: <20230719-nh_select-v2-1-04383e89f868@nvidia.com>
Date:   Wed, 19 Jul 2023 13:57:11 +0000
From:   Benjamin Poirier <bpoirier@...dia.com>
To:     David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next v2 1/4] nexthop: Factor out hash threshold fdb
 nexthop selection

The loop in nexthop_select_path_hthr() includes code to check for neighbor
validity. Since this does not apply to fdb nexthops, simplify the loop by
moving the fdb nexthop selection to its own function.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Signed-off-by: Benjamin Poirier <bpoirier@...dia.com>
Reviewed-by: David Ahern <dsahern@...nel.org>
---
 net/ipv4/nexthop.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index f95142e56da0..27089dea0ed0 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -1152,11 +1152,31 @@ static bool ipv4_good_nh(const struct fib_nh *nh)
 	return !!(state & NUD_VALID);
 }
 
+static struct nexthop *nexthop_select_path_fdb(struct nh_group *nhg, int hash)
+{
+	int i;
+
+	for (i = 0; i < nhg->num_nh; i++) {
+		struct nh_grp_entry *nhge = &nhg->nh_entries[i];
+
+		if (hash > atomic_read(&nhge->hthr.upper_bound))
+			continue;
+
+		return nhge->nh;
+	}
+
+	WARN_ON_ONCE(1);
+	return NULL;
+}
+
 static struct nexthop *nexthop_select_path_hthr(struct nh_group *nhg, int hash)
 {
 	struct nexthop *rc = NULL;
 	int i;
 
+	if (nhg->fdb_nh)
+		return nexthop_select_path_fdb(nhg, hash);
+
 	for (i = 0; i < nhg->num_nh; ++i) {
 		struct nh_grp_entry *nhge = &nhg->nh_entries[i];
 		struct nh_info *nhi;
@@ -1165,8 +1185,6 @@ static struct nexthop *nexthop_select_path_hthr(struct nh_group *nhg, int hash)
 			continue;
 
 		nhi = rcu_dereference(nhge->nh->nh_info);
-		if (nhi->fdb_nh)
-			return nhge->nh;
 
 		/* nexthops always check if it is good and does
 		 * not rely on a sysctl for this behavior

-- 
2.40.1