IPoIB: Fix kernel unaligned access on ia64
Fix misaligned access faults on ia64: never cast a misaligned
neighbour->ha + 4 pointer to union ib_gid type; pass a void * pointer
instead. The memcpy was being optimized to use full word accesses
because the compiler thought that union ib_gid is always aligned.
The cast in IPOIB_GID_ARG is safe, since it is fixed to access each
byte separately.
Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 12a1e05..491d2af 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -272,8 +272,7 @@
void ipoib_dev_cleanup(struct net_device *dev);
void ipoib_mcast_join_task(void *dev_ptr);
-void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
- struct sk_buff *skb);
+void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb);
void ipoib_mcast_restart_task(void *dev_ptr);
int ipoib_mcast_start_thread(struct net_device *dev);
@@ -369,15 +368,26 @@
#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG_DATA */
-#define IPOIB_GID_FMT "%x:%x:%x:%x:%x:%x:%x:%x"
+#define IPOIB_GID_FMT "%2.2x%2.2x:%2.2x%2.2x:%2.2x%2.2x:%2.2x%2.2x:" \
+ "%2.2x%2.2x:%2.2x%2.2x:%2.2x%2.2x:%2.2x%2.2x"
-#define IPOIB_GID_ARG(gid) be16_to_cpup((__be16 *) ((gid).raw + 0)), \
- be16_to_cpup((__be16 *) ((gid).raw + 2)), \
- be16_to_cpup((__be16 *) ((gid).raw + 4)), \
- be16_to_cpup((__be16 *) ((gid).raw + 6)), \
- be16_to_cpup((__be16 *) ((gid).raw + 8)), \
- be16_to_cpup((__be16 *) ((gid).raw + 10)), \
- be16_to_cpup((__be16 *) ((gid).raw + 12)), \
- be16_to_cpup((__be16 *) ((gid).raw + 14))
+#define IPOIB_GID_RAW_ARG(gid) ((u8 *)(gid))[0], \
+ ((u8 *)(gid))[1], \
+ ((u8 *)(gid))[2], \
+ ((u8 *)(gid))[3], \
+ ((u8 *)(gid))[4], \
+ ((u8 *)(gid))[5], \
+ ((u8 *)(gid))[6], \
+ ((u8 *)(gid))[7], \
+ ((u8 *)(gid))[8], \
+ ((u8 *)(gid))[9], \
+ ((u8 *)(gid))[10],\
+ ((u8 *)(gid))[11],\
+ ((u8 *)(gid))[12],\
+ ((u8 *)(gid))[13],\
+ ((u8 *)(gid))[14],\
+ ((u8 *)(gid))[15]
+
+#define IPOIB_GID_ARG(gid) IPOIB_GID_RAW_ARG((gid).raw)
#endif /* _IPOIB_H */
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index cb078a7..1c6ea1c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -185,8 +185,7 @@
return 0;
}
-static struct ipoib_path *__path_find(struct net_device *dev,
- union ib_gid *gid)
+static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct rb_node *n = priv->path_tree.rb_node;
@@ -196,7 +195,7 @@
while (n) {
path = rb_entry(n, struct ipoib_path, rb_node);
- ret = memcmp(gid->raw, path->pathrec.dgid.raw,
+ ret = memcmp(gid, path->pathrec.dgid.raw,
sizeof (union ib_gid));
if (ret < 0)
@@ -424,8 +423,7 @@
}
}
-static struct ipoib_path *path_rec_create(struct net_device *dev,
- union ib_gid *gid)
+static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_path *path;
@@ -440,7 +438,7 @@
INIT_LIST_HEAD(&path->neigh_list);
- memcpy(path->pathrec.dgid.raw, gid->raw, sizeof (union ib_gid));
+ memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
path->pathrec.sgid = priv->local_gid;
path->pathrec.pkey = cpu_to_be16(priv->pkey);
path->pathrec.numb_path = 1;
@@ -498,10 +496,9 @@
*/
spin_lock(&priv->lock);
- path = __path_find(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4));
+ path = __path_find(dev, skb->dst->neighbour->ha + 4);
if (!path) {
- path = path_rec_create(dev,
- (union ib_gid *) (skb->dst->neighbour->ha + 4));
+ path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
if (!path)
goto err_path;
@@ -551,7 +548,7 @@
/* Add in the P_Key for multicasts */
skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
- ipoib_mcast_send(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4), skb);
+ ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
}
static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
@@ -566,10 +563,9 @@
*/
spin_lock(&priv->lock);
- path = __path_find(dev, (union ib_gid *) (phdr->hwaddr + 4));
+ path = __path_find(dev, phdr->hwaddr + 4);
if (!path) {
- path = path_rec_create(dev,
- (union ib_gid *) (phdr->hwaddr + 4));
+ path = path_rec_create(dev, phdr->hwaddr + 4);
if (path) {
/* put pseudoheader back on for next time */
skb_push(skb, sizeof *phdr);
@@ -660,7 +656,7 @@
phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
phdr->hwaddr[9] = priv->pkey & 0xff;
- ipoib_mcast_send(dev, (union ib_gid *) (phdr->hwaddr + 4), skb);
+ ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
} else {
/* unicast GID -- should be ARP or RARP reply */
@@ -671,7 +667,7 @@
skb->dst ? "neigh" : "dst",
be16_to_cpup((__be16 *) skb->data),
be32_to_cpup((__be32 *) phdr->hwaddr),
- IPOIB_GID_ARG(*(union ib_gid *) (phdr->hwaddr + 4)));
+ IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
dev_kfree_skb_any(skb);
++priv->stats.tx_dropped;
goto out;
@@ -754,7 +750,7 @@
ipoib_dbg(priv,
"neigh_destructor for %06x " IPOIB_GID_FMT "\n",
be32_to_cpup((__be32 *) n->ha),
- IPOIB_GID_ARG(*((union ib_gid *) (n->ha + 4))));
+ IPOIB_GID_RAW_ARG(n->ha + 4));
spin_lock_irqsave(&priv->lock, flags);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 1dae4b2..ec41c8f 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -154,7 +154,7 @@
return mcast;
}
-static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
+static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct rb_node *n = priv->multicast_tree.rb_node;
@@ -165,7 +165,7 @@
mcast = rb_entry(n, struct ipoib_mcast, rb_node);
- ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
+ ret = memcmp(mgid, mcast->mcmember.mgid.raw,
sizeof (union ib_gid));
if (ret < 0)
n = n->rb_left;
@@ -694,8 +694,7 @@
return 0;
}
-void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
- struct sk_buff *skb)
+void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_mcast *mcast;
@@ -718,7 +717,7 @@
if (!mcast) {
/* Let's create a new send only group now */
ipoib_dbg_mcast(priv, "setting up send only multicast group for "
- IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
+ IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
mcast = ipoib_mcast_alloc(dev, 0);
if (!mcast) {
@@ -730,7 +729,7 @@
}
set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
- mcast->mcmember.mgid = *mgid;
+ memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
__ipoib_mcast_add(dev, mcast);
list_add_tail(&mcast->list, &priv->multicast_list);
}