RDMA/cma: Use neigh_event_send() to start neighbour discovery

Calling arp_send() to initiate neighbour discovery (ND) doesn't do the
full ND protocol.  Namely, it doesn't handle retransmitting the arp
request if it is dropped. The function neigh_event_send() does all
this.  Without doing full ND, RDMA address resolution fails in the
presence of dropped ARP broadcast packets.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Acked-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index c5c33d35f87d..5381c80de10a 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -161,8 +161,7 @@ static void addr_send_arp(struct sockaddr_in *dst_in)
         if (ip_route_output_key(&rt, &fl))
                 return;
 
-        arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev,
-                 rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL);
+        neigh_event_send(rt->u.dst.neighbour, NULL);
         ip_rt_put(rt);
 }