[PATCH net-next v2 4/7] net: dsa: add tagging ops to port

[Vivien Didelot]

The DSA tagging protocol operations are specific to each CPU port,
thus the dsa_device_ops pointer belongs to the dsa_port structure.

>From now on assign a slave's xmit copy from its CPU port tagging
operations. This will ease the future support for multiple CPU ports.

Also keep the tag_ops at the beginning of the dsa_port structure so that
we ensure copies for hot path are in cacheline 1.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 include/net/dsa.h  | 3 +++
 net/dsa/dsa2.c     | 1 +
 net/dsa/dsa_priv.h | 2 +-
 net/dsa/legacy.c   | 1 +
 net/dsa/slave.c    | 3 +--
 5 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 8dee216a5a9b..4d1df2f086e8 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -175,6 +175,9 @@ struct dsa_mall_tc_entry {
 
 
 struct dsa_port {
+       /* CPU port tagging operations used by master or slave devices */
+       const struct dsa_device_ops *tag_ops;
+
        struct dsa_switch       *ds;
        unsigned int            index;
        const char              *name;
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 6a10c5c1639f..9eac4726dc0c 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -522,6 +522,7 @@ static int dsa_cpu_parse(struct dsa_port *port, u32 index,
                return PTR_ERR(tag_ops);
        }
 
+       dst->cpu_dp->tag_ops = tag_ops;
        dst->tag_ops = tag_ops;
        dst->rcv = dst->tag_ops->rcv;
 
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index d429505dc4e7..9397291bb3aa 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -66,7 +66,7 @@ struct dsa_notifier_vlan_info {
 };
 
 struct dsa_slave_priv {
-       /* Copy of dp->ds->dst->tag_ops->xmit for faster access in hot path */
+       /* Copy of CPU port xmit for faster access in slave transmit hot path */
        struct sk_buff *        (*xmit)(struct sk_buff *skb,
                                        struct net_device *dev);
 
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 8e849013f69d..4d374541815a 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -152,6 +152,7 @@ static int dsa_switch_setup_one(struct dsa_switch *ds,
                if (IS_ERR(tag_ops))
                        return PTR_ERR(tag_ops);
 
+               dst->cpu_dp->tag_ops = tag_ops;
                dst->tag_ops = tag_ops;
                dst->rcv = dst->tag_ops->rcv;
        }
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index bf8800de13c1..4b634db05cee 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1117,7 +1117,6 @@ int dsa_slave_resume(struct net_device *slave_dev)
 int dsa_slave_create(struct dsa_port *port, const char *name)
 {
        struct dsa_switch *ds = port->ds;
-       struct dsa_switch_tree *dst = ds->dst;
        struct net_device *master;
        struct net_device *slave_dev;
        struct dsa_slave_priv *p;
@@ -1162,7 +1161,7 @@ int dsa_slave_create(struct dsa_port *port, const char 
*name)
        }
        p->dp = port;
        INIT_LIST_HEAD(&p->mall_tc_list);
-       p->xmit = dst->tag_ops->xmit;
+       p->xmit = cpu_dp->tag_ops->xmit;
 
        p->old_pause = -1;
        p->old_link = -1;
-- 
2.14.1