From: Eric Dumazet <edumazet@google.com>

Because bonding stats are usually sum of slave stats, it was
not easy to account for tx drops at bonding layer.

We can use dev->tx_dropped for this, as this counter is later
added to the device stats (in dev_get_stats())

This extends the idea we had in commit ee6377147409a ("bonding: Simplify
the xmit function for modes that use xmit_hash") for bond_3ad_xor_xmit()
to other bonding modes.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mahesh Bandewar <redacted>

---
 drivers/net/bonding/bond_alb.c  |    2 +-
 drivers/net/bonding/bond_main.c |   15 +++++++--------
 drivers/net/bonding/bonding.h   |    6 ++++++
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index d2eadab787c55d8fc0f361755409a880d64abfb3..baa58e79256a8b804e6ab683af6665f0730b86de 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c

@@ -1326,7 +1326,7 @@ static int bond_do_alb_xmit(struct sk_buff *skb, struct bonding *bond,
        }

        /* no suitable interface, frame not sent */
-       dev_kfree_skb_any(skb);
+       bond_tx_drop(bond->dev, skb);
 out:
        return NETDEV_TX_OK;
 }

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index c9ac06cfe6b7b3a8f62568b70a6ad6d7ca9b44d0..c7520082fb0d7bfbc34ac00b4f4186a30197ad74 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c

@@ -3522,7 +3522,7 @@ static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int sl
                }
        }
        /* no slave that can tx has been found */
-       dev_kfree_skb_any(skb);
+       bond_tx_drop(bond->dev, skb);
 }

 /**

@@ -3584,7 +3584,7 @@ static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev
                        slave_id = bond_rr_gen_slave_id(bond);
                        bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
                } else {
-                       dev_kfree_skb_any(skb);
+                       bond_tx_drop(bond_dev, skb);
                }
        }

@@ -3603,7 +3603,7 @@ static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_d
        if (slave)
                bond_dev_queue_xmit(bond, skb, slave->dev);
        else
-               dev_kfree_skb_any(skb);
+               bond_tx_drop(bond_dev, skb);

        return NETDEV_TX_OK;
 }

@@ -3747,8 +3747,7 @@ int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
                slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
                bond_dev_queue_xmit(bond, skb, slave->dev);
        } else {
-               dev_kfree_skb_any(skb);
-               atomic_long_inc(&dev->tx_dropped);
+               bond_tx_drop(dev, skb);
        }

        return NETDEV_TX_OK;

@@ -3778,7 +3777,7 @@ static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
        if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
                bond_dev_queue_xmit(bond, skb, slave->dev);
        else
-               dev_kfree_skb_any(skb);
+               bond_tx_drop(bond_dev, skb);

        return NETDEV_TX_OK;
 }

@@ -3858,7 +3857,7 @@ static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev
                /* Should never happen, mode already checked */
                netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
                WARN_ON_ONCE(1);
-               dev_kfree_skb_any(skb);
+               bond_tx_drop(dev, skb);
                return NETDEV_TX_OK;
        }
 }

@@ -3878,7 +3877,7 @@ static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
        if (bond_has_slaves(bond))
                ret = __bond_start_xmit(skb, dev);
        else
-               dev_kfree_skb_any(skb);
+               bond_tx_drop(dev, skb);
        rcu_read_unlock();

        return ret;

diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 10920f0686e2f0222203359751581d1b728c6617..bfb0b51c081a27fbbbe64deda058f70860aac49d 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h

@@ -645,4 +645,10 @@ extern struct bond_parm_tbl ad_select_tbl[];
 /* exported from bond_netlink.c */
 extern struct rtnl_link_ops bond_link_ops;

+static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
+{
+       atomic_long_inc(&dev->tx_dropped);
+       dev_kfree_skb_any(skb);
+}
+
 #endif /* _LINUX_BONDING_H */