Merge branch 'switchdev-locking'

Jiri Pirko says:

====================
switchdev: change locking

This is something which I'm currently struggling with.
Callers of attr_set and obj_add/del often hold not only RTNL, but also
spinlock (bridge). So in that case, the driver implementing the op cannot sleep.

The way rocker is dealing with this now is just to invoke driver operation
and go out, without any checking or reporting of the operation status.

Since it would be nice to at least put a warning in case the operation fails,
it makes sense to do this in delayed work directly in switchdev core
instead of implementing this in separate drivers. And that is what this patchset
is introducing.

So from now on, the locking of switchdev mod ops is consistent. Caller either
holds rtnl mutex or in case it does not, caller sets defer flag, telling
switchdev core to process the op later, in deferred queue.

Function to force to process switchdev deferred ops can be called by op
caller in appropriate location, for example after it releases
spin lock, to force switchdev core to process pending ops.

v1->v2:
- rebased on current net-next head (including Scott's ageing patchset)
v2->v3:
- fixed comment s/of/or/ typo suggested by Nik
v3->v4:
- the actual patchset is sent instead of different branch I send in v3 :/
v4->v5:
- added patch to "const" attr param
- reworked deferred ops infrastructure (mainly patch number 1 and
  internal users (patch 3 and 5)) - resolves the issue pointed out
  by John
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 8 deletions

diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
index eafa907965ec..32a80d2df7ff 100644
--- a/drivers/net/ethernet/rocker/rocker.c
+++ b/drivers/net/ethernet/rocker/rocker.c
@@ -3672,7 +3672,7 @@ static int rocker_port_fdb_flush(struct rocker_port *rocker_port,
 	    rocker_port->stp_state == BR_STATE_FORWARDING)
 		return 0;
 
-	flags |= ROCKER_OP_FLAG_REMOVE;
+	flags |= ROCKER_OP_FLAG_NOWAIT | ROCKER_OP_FLAG_REMOVE;
 
 	spin_lock_irqsave(&rocker->fdb_tbl_lock, lock_flags);
 
@@ -4374,7 +4374,7 @@ static int rocker_port_bridge_ageing_time(struct rocker_port *rocker_port,
 }
 
 static int rocker_port_attr_set(struct net_device *dev,
-				struct switchdev_attr *attr,
+				const struct switchdev_attr *attr,
 				struct switchdev_trans *trans)
 {
 	struct rocker_port *rocker_port = netdev_priv(dev);
@@ -4382,8 +4382,7 @@ static int rocker_port_attr_set(struct net_device *dev,
 
 	switch (attr->id) {
 	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
-		err = rocker_port_stp_update(rocker_port, trans,
-					     ROCKER_OP_FLAG_NOWAIT,
+		err = rocker_port_stp_update(rocker_port, trans, 0,
 					     attr->u.stp_state);
 		break;
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
@@ -4469,7 +4468,7 @@ static int rocker_port_obj_add(struct net_device *dev,
 		fib4 = SWITCHDEV_OBJ_IPV4_FIB(obj);
 		err = rocker_port_fib_ipv4(rocker_port, trans,
 					   htonl(fib4->dst), fib4->dst_len,
-					   fib4->fi, fib4->tb_id, 0);
+					   &fib4->fi, fib4->tb_id, 0);
 		break;
 	case SWITCHDEV_OBJ_ID_PORT_FDB:
 		err = rocker_port_fdb_add(rocker_port, trans,
@@ -4517,7 +4516,7 @@ static int rocker_port_fdb_del(struct rocker_port *rocker_port,
 			       const struct switchdev_obj_port_fdb *fdb)
 {
 	__be16 vlan_id = rocker_port_vid_to_vlan(rocker_port, fdb->vid, NULL);
-	int flags = ROCKER_OP_FLAG_NOWAIT | ROCKER_OP_FLAG_REMOVE;
+	int flags = ROCKER_OP_FLAG_REMOVE;
 
 	if (!rocker_port_is_bridged(rocker_port))
 		return -EINVAL;
@@ -4541,7 +4540,7 @@ static int rocker_port_obj_del(struct net_device *dev,
 		fib4 = SWITCHDEV_OBJ_IPV4_FIB(obj);
 		err = rocker_port_fib_ipv4(rocker_port, NULL,
 					   htonl(fib4->dst), fib4->dst_len,
-					   fib4->fi, fib4->tb_id,
+					   &fib4->fi, fib4->tb_id,
 					   ROCKER_OP_FLAG_REMOVE);
 		break;
 	case SWITCHDEV_OBJ_ID_PORT_FDB:
@@ -4571,7 +4570,7 @@ static int rocker_port_fdb_dump(const struct rocker_port *rocker_port,
 	hash_for_each_safe(rocker->fdb_tbl, bkt, tmp, found, entry) {
 		if (found->key.rocker_port != rocker_port)
 			continue;
-		fdb->addr = found->key.addr;
+		ether_addr_copy(fdb->addr, found->key.addr);
 		fdb->ndm_state = NUD_REACHABLE;
 		fdb->vid = rocker_port_vlan_to_vid(rocker_port,
 						   found->key.vlan_id);