[openib-general] [PATCH repost 2 of 2] ipoib: neighbour issues
Michael S. Tsirkin
mst at mellanox.co.il
Tue Dec 20 11:03:10 PST 2005
This series includes two patches I posted previously: they address two
independent issues but happen to affect adjacent lines in ipoib_multicast.c
I also renamed the global list of neighbours to ipoib_all_neigh_list.
---
IPoIB uses neighbour ops->destructor to clean up struct ipoib_neigh,
but ignores the fact that multiple neighbour objects can share
the same ops structure, so setting it to NULL affects multiple neighbours.
Fix this, by tracking all ipoib_neigh objects, and only cleaning
destructor after no neighbour is going to use it.
Note that ops structure isnt per device, so we track them in a global list.
Signed-off-by: Michael S. Tsirkin <mst at mellanox.co.il>
Index: openib/drivers/infiniband/ulp/ipoib/ipoib_main.c
===================================================================
--- openib.orig/drivers/infiniband/ulp/ipoib/ipoib_main.c 2005-12-20 20:25:55.000000000 +0200
+++ openib/drivers/infiniband/ulp/ipoib/ipoib_main.c 2005-12-20 20:28:19.000000000 +0200
@@ -71,6 +71,9 @@ static const u8 ipv4_bcast_addr[] = {
struct workqueue_struct *ipoib_workqueue;
+static spinlock_t ipoib_all_neigh_list_lock;
+static LIST_HEAD(ipoib_all_neigh_list);
+
static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device);
@@ -244,9 +247,8 @@ static void path_free(struct net_device
*/
if (neigh->ah)
ipoib_put_ah(neigh->ah);
- *to_ipoib_neigh(neigh->neighbour) = NULL;
- neigh->neighbour->ops->destructor = NULL;
- kfree(neigh);
+
+ ipoib_neigh_free(neigh);
}
spin_unlock_irqrestore(&priv->lock, flags);
@@ -474,7 +476,7 @@ static void neigh_add_path(struct sk_buf
struct ipoib_path *path;
struct ipoib_neigh *neigh;
- neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
+ neigh = ipoib_neigh_alloc(skb->dst->neighbour);
if (!neigh) {
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
@@ -482,8 +484,6 @@ static void neigh_add_path(struct sk_buf
}
skb_queue_head_init(&neigh->queue);
- neigh->neighbour = skb->dst->neighbour;
- *to_ipoib_neigh(skb->dst->neighbour) = neigh;
/*
* We can only be called from ipoib_start_xmit, so we're
@@ -526,11 +526,8 @@ static void neigh_add_path(struct sk_buf
return;
err:
- *to_ipoib_neigh(skb->dst->neighbour) = NULL;
list_del(&neigh->list);
- neigh->neighbour->ops->destructor = NULL;
- kfree(neigh);
-
+ ipoib_neigh_free(neigh);
++priv->stats.tx_dropped;
dev_kfree_skb_any(skb);
@@ -757,8 +754,7 @@ static void ipoib_neigh_destructor(struc
if (neigh->ah)
ah = neigh->ah;
list_del(&neigh->list);
- *to_ipoib_neigh(n) = NULL;
- kfree(neigh);
+ ipoib_neigh_free(neigh);
}
spin_unlock_irqrestore(&priv->lock, flags);
@@ -767,23 +763,45 @@ static void ipoib_neigh_destructor(struc
ipoib_put_ah(ah);
}
-static int ipoib_neigh_setup(struct neighbour *neigh)
+struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
{
+ struct ipoib_neigh *neigh;
+
+ neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
+ if (!neigh)
+ return NULL;
+
+ neigh->neighbour = neighbour;
+ *to_ipoib_neigh(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;
+ spin_lock(&ipoib_all_neigh_list_lock);
+ list_add_tail(&neigh->all_neigh_list, &ipoib_all_neigh_list);
+ neigh->neighbour->ops->destructor = ipoib_neigh_destructor;
+ spin_unlock(&ipoib_all_neigh_list_lock);
+ return neigh;
}
-static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
+void ipoib_neigh_free(struct ipoib_neigh *neigh)
{
- parms->neigh_setup = ipoib_neigh_setup;
+ struct ipoib_neigh *n;
- return 0;
+ spin_lock(&ipoib_all_neigh_list_lock);
+ list_del(&neigh->all_neigh_list);
+
+ list_for_each_entry(n, &ipoib_all_neigh_list, all_neigh_list)
+ if (n->neighbour->ops == neigh->neighbour->ops)
+ goto found;
+
+ neigh->neighbour->ops->destructor = NULL;
+found:
+ spin_unlock(&ipoib_all_neigh_list_lock);
+ *to_ipoib_neigh(neigh->neighbour) = NULL;
+ kfree(neigh);
}
int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
@@ -859,7 +877,6 @@ static void ipoib_setup(struct net_devic
dev->tx_timeout = ipoib_timeout;
dev->hard_header = ipoib_hard_header;
dev->set_multicast_list = ipoib_set_mcast_list;
- dev->neigh_setup = ipoib_neigh_setup_dev;
dev->watchdog_timeo = HZ;
@@ -1146,6 +1163,8 @@ static int __init ipoib_init_module(void
if (ret)
goto err_wq;
+ spin_lock_init(&ipoib_all_neigh_list_lock);
+
return 0;
err_wq:
Index: openib/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
===================================================================
--- openib.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c 2005-12-20 20:26:09.000000000 +0200
+++ openib/drivers/infiniband/ulp/ipoib/ipoib_multicast.c 2005-12-20 20:27:32.000000000 +0200
@@ -111,9 +111,7 @@ static void ipoib_mcast_free(struct ipoi
*/
if (neigh->ah)
ipoib_put_ah(neigh->ah);
- *to_ipoib_neigh(neigh->neighbour) = NULL;
- neigh->neighbour->ops->destructor = NULL;
- kfree(neigh);
+ ipoib_neigh_free(neigh);
}
spin_unlock_irqrestore(&priv->lock, flags);
@@ -719,13 +717,11 @@ out:
if (skb->dst &&
skb->dst->neighbour &&
!*to_ipoib_neigh(skb->dst->neighbour)) {
- struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
+ struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
if (neigh) {
kref_get(&mcast->ah->ref);
neigh->ah = mcast->ah;
- neigh->neighbour = skb->dst->neighbour;
- *to_ipoib_neigh(skb->dst->neighbour) = neigh;
list_add_tail(&neigh->list, &mcast->neigh_list);
}
}
Index: openib/drivers/infiniband/ulp/ipoib/ipoib.h
===================================================================
--- openib.orig/drivers/infiniband/ulp/ipoib/ipoib.h 2005-12-20 20:25:55.000000000 +0200
+++ openib/drivers/infiniband/ulp/ipoib/ipoib.h 2005-12-20 20:26:25.000000000 +0200
@@ -214,6 +214,7 @@ struct ipoib_neigh {
struct neighbour *neighbour;
struct list_head list;
+ struct list_head all_neigh_list;
};
static inline struct ipoib_neigh **to_ipoib_neigh(struct neighbour *neigh)
@@ -222,6 +223,9 @@ static inline struct ipoib_neigh **to_ip
(offsetof(struct neighbour, ha) & 4));
}
+struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neigh);
+void ipoib_neigh_free(struct ipoib_neigh *neigh);
+
extern struct workqueue_struct *ipoib_workqueue;
/* functions */
--
MST
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