[NET]: Move destructor from neigh->ops to neigh_params

struct neigh_ops currently has a destructor field, which no in-kernel
drivers outside of infiniband use.  The infiniband/ulp/ipoib in-tree
driver stashes some info in the neighbour structure (the results of
the second-stage lookup from ARP results to real link-level path), and
it uses neigh->ops->destructor to get a callback so it can clean up
this extra info when a neighbour is freed.  We've run into problems
with this: since the destructor is in an ops field that is shared
between neighbours that may belong to different net devices, there's
no way to set/clear it safely.

The following patch moves this field to neigh_parms where it can be
safely set, together with its twin neigh_setup.  Two additional
patches in the patch series update ipoib to use this new interface.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index c3b5f79..9d9cecd 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -247,7 +247,6 @@ static void path_free(struct net_device *dev, struct ipoib_path *path)
                if (neigh->ah)
                        ipoib_put_ah(neigh->ah);
                *to_ipoib_neigh(neigh->neighbour) = NULL;
-               neigh->neighbour->ops->destructor = NULL;
                kfree(neigh);
        }
 
@@ -530,7 +529,6 @@ static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
 err:
        *to_ipoib_neigh(skb->dst->neighbour) = NULL;
        list_del(&neigh->list);
-       neigh->neighbour->ops->destructor = NULL;
        kfree(neigh);
 
        ++priv->stats.tx_dropped;
@@ -769,21 +767,9 @@ static void ipoib_neigh_destructor(struct neighbour *n)
                ipoib_put_ah(ah);
 }
 
-static int ipoib_neigh_setup(struct neighbour *neigh)
-{
-       /*
-        * Is this kosher?  I can't find anybody in the kernel that
-        * sets neigh->destructor, so we should be able to set it here
-        * without trouble.
-        */
-       neigh->ops->destructor = ipoib_neigh_destructor;
-
-       return 0;
-}
-
 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
 {
-       parms->neigh_setup = ipoib_neigh_setup;
+       parms->neigh_destructor = ipoib_neigh_destructor;
 
        return 0;
 }

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 6fa9ae1..b0666d6 100644 (file)
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -68,6 +68,7 @@ struct neigh_parms
        struct net_device *dev;
        struct neigh_parms *next;
        int     (*neigh_setup)(struct neighbour *);
+       void    (*neigh_destructor)(struct neighbour *);
        struct neigh_table *tbl;
 
        void    *sysctl_table;
@@ -145,7 +146,6 @@ struct neighbour
 struct neigh_ops
 {
        int                     family;
-       void                    (*destructor)(struct neighbour *);
        void                    (*solicit)(struct neighbour *, struct sk_buff*);
        void                    (*error_report)(struct neighbour *, struct sk_buff*);
        int                     (*output)(struct sk_buff*);

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 6ba1cde..0c86668 100644 (file)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -586,8 +586,8 @@ void neigh_destroy(struct neighbour *neigh)
                        kfree(hh);
        }
 
-       if (neigh->ops && neigh->ops->destructor)
-               (neigh->ops->destructor)(neigh);
+       if (neigh->parms->neigh_destructor)
+               (neigh->parms->neigh_destructor)(neigh);
 
        skb_queue_purge(&neigh->arp_queue);