linux-kernel - [PATCH net-next 6/8] net: dsa: prepare master receive hot path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20170929183635.8122-7-vivien.didelot@savoirfairelinux.com>
Date:   Fri, 29 Sep 2017 14:36:33 -0400
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: [PATCH net-next 6/8] net: dsa: prepare master receive hot path

In preparation to make DSA master devices point to their corresponding
CPU port instead of the whole tree, add copies of dst and rcv in the
dsa_port structure so that we keep fast access in the receive hot path.

Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
---
 include/net/dsa.h | 5 +++++
 net/dsa/dsa2.c    | 4 ++++
 net/dsa/legacy.c  | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 6cd36dcb65e1..75dc4024f5a8 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -192,6 +192,11 @@ struct dsa_port {
 
 	/* CPU port tagging operations used by master or slave devices */
 	const struct dsa_device_ops *tag_ops;
+
+	/* Copies for faster access in master receive hot path */
+	struct dsa_switch_tree *dst;
+	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
+			       struct packet_type *pt);
 };
 
 struct dsa_switch {
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 9eac4726dc0c..b71e3bb478e4 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -524,7 +524,11 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
 
 	dst->cpu_dp->tag_ops = tag_ops;
 	dst->tag_ops = tag_ops;
+
+	/* Make a few copies for faster access in master receive hot path */
+	dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
 	dst->rcv = dst->tag_ops->rcv;
+	dst->cpu_dp->dst = dst;
 
 	return 0;
 }
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 4d374541815a..96c7e3f8b8bb 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -154,7 +154,11 @@ static int dsa_switch_setup_one(struct dsa_switch *ds,
 
 		dst->cpu_dp->tag_ops = tag_ops;
 		dst->tag_ops = tag_ops;
+
+		/* Few copies for faster access in master receive hot path */
+		dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
 		dst->rcv = dst->tag_ops->rcv;
+		dst->cpu_dp->dst = dst;
 	}
 
 	memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
-- 
2.14.1