RDMA/CMA: Use neigh_event_send() to initiate 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 bcast packets.
Signed-off-by: Steve Wise <email@example.com>
drivers/infiniband/core/addr.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index c5c33d3..5381c80 100644
@@ -161,8 +161,7 @@ static void addr_send_arp(struct sockadd
if (ip_route_output_key(&rt, &fl))
- 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);
Is there a way to deploy something similar for the gratuitous arp being
sent by the bonding driver at bond_arp_send()?
We have seen rare situations where the skb was dropped by the stack and
hence bonding fail-over was detected by the remote peer only when its
neighboring subsystem probe failures dictated that a new arp must be issued.