IB/mlx4: Add support for IBoE

Add support for IBoE to mlx4_ib.  The bulk of the code is handling the
new address vector fields; mlx4 needs the MAC address of a remote node
to include it in a WQE (for datagrams) or in the QP context (for
connected QPs).  Address resolution is done by assuming all unicast
GIDs are either link-local IPv6 addresses.

Multicast group attach/detach needs to update the NIC's multicast
filters; but since attaching a QP to a multicast group can be done
before the QP is bound to a port, for IBoE we need to keep track of
all multicast groups that a QP is attached too before it transitions
from INIT to RTR (since it does not have a port in the INIT state).

Signed-off-by: Eli Cohen <eli@mellanox.co.il>

[ Many things cleaned up and otherwise monkeyed with; hope I didn't
  introduce too many bugs.  - Roland ]

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 20 insertions, 12 deletions

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index f38d5b118927..c9a8dd63b9e2 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -311,19 +311,25 @@ int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
         struct ib_mad_agent *agent;
         int p, q;
         int ret;
+        enum rdma_link_layer ll;
 
-        for (p = 0; p < dev->num_ports; ++p)
+        for (p = 0; p < dev->num_ports; ++p) {
+                ll = rdma_port_get_link_layer(&dev->ib_dev, p + 1);
                 for (q = 0; q <= 1; ++q) {
-                        agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
-                                                      q ? IB_QPT_GSI : IB_QPT_SMI,
-                                                      NULL, 0, send_handler,
-                                                      NULL, NULL);
-                        if (IS_ERR(agent)) {
-                                ret = PTR_ERR(agent);
-                                goto err;
-                        }
-                        dev->send_agent[p][q] = agent;
+                        if (ll == IB_LINK_LAYER_INFINIBAND) {
+                                agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
+                                                              q ? IB_QPT_GSI : IB_QPT_SMI,
+                                                              NULL, 0, send_handler,
+                                                              NULL, NULL);
+                                if (IS_ERR(agent)) {
+                                        ret = PTR_ERR(agent);
+                                        goto err;
+                                }
+                                dev->send_agent[p][q] = agent;
+                        } else
+                                dev->send_agent[p][q] = NULL;
                 }
+        }
 
         return 0;
 
@@ -344,8 +350,10 @@ void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
         for (p = 0; p < dev->num_ports; ++p) {
                 for (q = 0; q <= 1; ++q) {
                         agent = dev->send_agent[p][q];
-                        dev->send_agent[p][q] = NULL;
-                        ib_unregister_mad_agent(agent);
+                        if (agent) {
+                                dev->send_agent[p][q] = NULL;
+                                ib_unregister_mad_agent(agent);
+                        }
                 }
 
                 if (dev->sm_ah[p])