[PATCH net-next 3/4] net: dsa: setup master ethtool after dsa_ptr

[Vivien Didelot]

DSA overrides the master's ethtool ops so that we can inject its CPU
port's statistics. Because of that, we need to setup the ethtool ops
after the master's dsa_ptr pointer has been assigned, not before.

This patch setups the ethtool ops after dsa_ptr is assigned, and
restores them before it gets cleared.

Signed-off-by: Vivien Didelot <vivien.dide...@savoirfairelinux.com>
---
 net/dsa/dsa2.c   | 12 +++++++-----
 net/dsa/legacy.c | 10 +++-------
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index bd19304f862f..032f8bc3e788 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -433,16 +433,17 @@ static int dsa_dst_apply(struct dsa_switch_tree *dst)
                        return err;
        }
 
-       err = dsa_cpu_port_ethtool_setup(dst->cpu_dp);
-       if (err)
-               return err;
-
        /* If we use a tagging format that doesn't have an ethertype
         * field, make sure that all packets from this point on get
         * sent to the tag format's receive function.
         */
        wmb();
        dst->cpu_dp->netdev->dsa_ptr = dst;
+
+       err = dsa_cpu_port_ethtool_setup(dst->cpu_dp);
+       if (err)
+               return err;
+
        dst->applied = true;
 
        return 0;
@@ -456,6 +457,8 @@ static void dsa_dst_unapply(struct dsa_switch_tree *dst)
        if (!dst->applied)
                return;
 
+       dsa_cpu_port_ethtool_restore(dst->cpu_dp);
+
        dst->cpu_dp->netdev->dsa_ptr = NULL;
 
        /* If we used a tagging format that doesn't have an ethertype
@@ -472,7 +475,6 @@ static void dsa_dst_unapply(struct dsa_switch_tree *dst)
                dsa_ds_unapply(dst, ds);
        }
 
-       dsa_cpu_port_ethtool_restore(dst->cpu_dp);
        dst->cpu_dp = NULL;
 
        pr_info("DSA: tree %d unapplied\n", dst->tree);
diff --git a/net/dsa/legacy.c b/net/dsa/legacy.c
index 91e6f7981d39..163910699db7 100644
--- a/net/dsa/legacy.c
+++ b/net/dsa/legacy.c
@@ -206,10 +206,6 @@ static int dsa_switch_setup_one(struct dsa_switch *ds,
                netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
                           index);
 
-       ret = dsa_cpu_port_ethtool_setup(ds->dst->cpu_dp);
-       if (ret)
-               return ret;
-
        return 0;
 }
 
@@ -606,7 +602,7 @@ static int dsa_setup_dst(struct dsa_switch_tree *dst, 
struct net_device *dev,
        wmb();
        dev->dsa_ptr = dst;
 
-       return 0;
+       return dsa_cpu_port_ethtool_setup(dst->cpu_dp);
 }
 
 static int dsa_probe(struct platform_device *pdev)
@@ -671,6 +667,8 @@ static void dsa_remove_dst(struct dsa_switch_tree *dst)
 {
        int i;
 
+       dsa_cpu_port_ethtool_restore(dst->cpu_dp);
+
        dst->cpu_dp->netdev->dsa_ptr = NULL;
 
        /* If we used a tagging format that doesn't have an ethertype
@@ -686,8 +684,6 @@ static void dsa_remove_dst(struct dsa_switch_tree *dst)
                        dsa_switch_destroy(ds);
        }
 
-       dsa_cpu_port_ethtool_restore(dst->cpu_dp);
-
        dev_put(dst->cpu_dp->netdev);
 }
 
-- 
2.14.1