cxgb4: Save the correct mac addr for hw-loopback connections in the L2T

Hardware needs the local device mac address to support hw loopback for
rdma loopback connections.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/l2t.c b/drivers/net/ethernet/chelsio/cxgb4/l2t.c
index 81e8402a74b4..8a96572fdde0 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/l2t.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/l2t.c
@@ -154,7 +154,7 @@ static int write_l2e(struct adapter *adap, struct l2t_entry *e, int sync)
         req->params = htons(L2T_W_PORT(e->lport) | L2T_W_NOREPLY(!sync));
         req->l2t_idx = htons(e->idx);
         req->vlan = htons(e->vlan);
-        if (e->neigh)
+        if (e->neigh && !(e->neigh->dev->flags & IFF_LOOPBACK))
                 memcpy(e->dmac, e->neigh->ha, sizeof(e->dmac));
         memcpy(req->dst_mac, e->dmac, sizeof(req->dst_mac));
 
@@ -394,6 +394,8 @@ struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
         if (e) {
                 spin_lock(&e->lock);          /* avoid race with t4_l2t_free */
                 e->state = L2T_STATE_RESOLVING;
+                if (neigh->dev->flags & IFF_LOOPBACK)
+                        memcpy(e->dmac, physdev->dev_addr, sizeof(e->dmac));
                 memcpy(e->addr, addr, addr_len);
                 e->ifindex = ifidx;
                 e->hash = hash;