netdev - [PATCH net-next v2 5/7] net: dsa: prepare master receive hot path

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Date:   Fri, 29 Sep 2017 17:19:19 -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 v2 5/7] 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.

Also keep the copies at the beginning of the dsa_port structure in order
to ensure they are available in cacheline 1.

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 4d1df2f086e8..6bda01fa5747 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -178,6 +178,11 @@ 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	*ds;
 	unsigned int		index;
 	const char		*name;
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