[openib-general] [PATCH 03/12] ofed_1_2 Backport 2.6.16: Simulate neigh update events by snooping ARP packets

[Steve Wise]

Backport 2.6.16: Simulate neigh update events by snooping ARP packets

Signed-off-by: Steve Wise <swise at opengridcomputing.com>
---

 .../backport/2.6.16/include/src/netevent.c         |   68 ++++++++++++++++++++-
 .../2.6.16/addr_1_netevents_revert_to_2_6_17.patch |   76 -----------------------
 2 files changed, 65 insertions(+), 79 deletions(-)

diff --git a/kernel_addons/backport/2.6.16/include/src/netevent.c b/kernel_addons/backport/2.6.16/include/src/netevent.c
index 5ffadd1..188283c 100644
--- a/kernel_addons/backport/2.6.16/include/src/netevent.c
+++ b/kernel_addons/backport/2.6.16/include/src/netevent.c
@@ -13,10 +13,57 @@
  *	Fixes:
  */
 
-#include <linux/module.h>
-#include <linux/skbuff.h>
 #include <linux/rtnetlink.h>
 #include <linux/notifier.h>
+#include <linux/mutex.h>
+#include <linux/if.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+
+#include <net/arp.h>
+#include <net/neighbour.h>
+#include <net/route.h>
+#include <net/netevent.h>
+
+static DEFINE_MUTEX(lock);
+static int count;
+
+static void destructor(struct sk_buff *skb)
+{
+	struct neighbour *n;
+	u8 *arp_ptr;
+	__be32 gw;
+
+	/* Pull the SPA */
+	arp_ptr = skb->nh.raw + sizeof(struct arphdr) + skb->dev->addr_len;
+	memcpy(&gw, arp_ptr, 4);
+	n = neigh_lookup(&arp_tbl, &gw, skb->dev);
+	if (n)
+		call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
+	return;
+}
+
+static int arp_recv(struct sk_buff *skb, struct net_device *dev,
+			 struct packet_type *pkt, struct net_device *dev2)
+{
+	struct arphdr *arp_hdr;
+	u16 op;
+
+	arp_hdr = (struct arphdr *) skb->nh.raw;
+	op = ntohs(arp_hdr->ar_op);
+
+	if ((op == ARPOP_REQUEST || op == ARPOP_REPLY) && !skb->destructor)
+		skb->destructor = destructor;
+
+	kfree_skb(skb);
+	return 0;
+}
+
+static struct packet_type arp = {
+	.type = __constant_htons(ETH_P_ARP),
+	.func = arp_recv,
+	.af_packet_priv = (void *)1,
+};
 
 static struct notifier_block *netevent_notif_chain;
 
@@ -34,6 +81,12 @@ int register_netevent_notifier(struct no
 	int err;
 
 	err = notifier_chain_register(&netevent_notif_chain, nb);
+	if (!err) {
+		mutex_lock(&lock);
+		if (count++ == 0) 	
+			dev_add_pack(&arp);
+		mutex_unlock(&lock);
+	}
 	return err;
 }
 
@@ -49,7 +102,16 @@ int register_netevent_notifier(struct no
 
 int unregister_netevent_notifier(struct notifier_block *nb)
 {
-	return notifier_chain_unregister(&netevent_notif_chain, nb);
+	int err;
+
+	err = notifier_chain_unregister(&netevent_notif_chain, nb);
+	if (!err) {
+		mutex_lock(&lock);
+		if (--count == 0) 	
+			dev_remove_pack(&arp);
+		mutex_unlock(&lock);
+	}
+	return err;
 }
 
 /**
diff --git a/kernel_patches/backport/2.6.16/addr_1_netevents_revert_to_2_6_17.patch b/kernel_patches/backport/2.6.16/addr_1_netevents_revert_to_2_6_17.patch
deleted file mode 100644
index 316d8d2..0000000
--- a/kernel_patches/backport/2.6.16/addr_1_netevents_revert_to_2_6_17.patch
+++ /dev/null
@@ -1,76 +0,0 @@
-commit e795d092507d571d66f2ec98d3efdc7dd284bf80
-Author: Tom Tucker <tom at opengridcomputing.com>
-Date:   Sun Jul 30 20:44:19 2006 -0700
-
-    [NET] infiniband: Cleanup ib_addr module to use the netevents
-    
-    Signed-off-by: Tom Tucker <tom at opengridcomputing.com>
-    Signed-off-by: Steve Wise <swise at opengridcomputing.com>
-    Signed-off-by: David S. Miller <davem at davemloft.net>
-
-diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
-index 1205e80..d294bbc 100644
---- a/drivers/infiniband/core/addr.c
-+++ b/drivers/infiniband/core/addr.c
-@@ -35,7 +35,6 @@ #include <linux/if_arp.h>
- #include <net/arp.h>
- #include <net/neighbour.h>
- #include <net/route.h>
--#include <net/netevent.h>
- #include <rdma/ib_addr.h>
- 
- MODULE_AUTHOR("Sean Hefty");
-@@ -327,22 +326,25 @@ void rdma_addr_cancel(struct rdma_dev_ad
- }
- EXPORT_SYMBOL(rdma_addr_cancel);
- 
--static int netevent_callback(struct notifier_block *self, unsigned long event, 
--	void *ctx)
-+static int addr_arp_recv(struct sk_buff *skb, struct net_device *dev,
-+			 struct packet_type *pkt, struct net_device *orig_dev)
- {
--	if (event == NETEVENT_NEIGH_UPDATE) {  
--		struct neighbour *neigh = ctx;
-+	struct arphdr *arp_hdr;
- 
--		if (neigh->dev->type == ARPHRD_INFINIBAND &&
--		    (neigh->nud_state & NUD_VALID)) {
--			set_timeout(jiffies);
--		}
--	}
-+	arp_hdr = (struct arphdr *) skb->nh.raw;
-+
-+	if (arp_hdr->ar_op == htons(ARPOP_REQUEST) ||
-+	    arp_hdr->ar_op == htons(ARPOP_REPLY))
-+		set_timeout(jiffies);
-+
-+	kfree_skb(skb);
- 	return 0;
- }
- 
--static struct notifier_block nb = {
--	.notifier_call = netevent_callback
-+static struct packet_type addr_arp = {
-+	.type           = __constant_htons(ETH_P_ARP),
-+	.func           = addr_arp_recv,
-+	.af_packet_priv = (void*) 1,
- };
- 
- static int addr_init(void)
-@@ -351,13 +353,13 @@ static int addr_init(void)
- 	if (!addr_wq)
- 		return -ENOMEM;
- 
--	register_netevent_notifier(&nb);
-+	dev_add_pack(&addr_arp);
- 	return 0;
- }
- 
- static void addr_cleanup(void)
- {
--	unregister_netevent_notifier(&nb);
-+	dev_remove_pack(&addr_arp);
- 	destroy_workqueue(addr_wq);
- }
- 
-