RDMA/nes: CM connection setup/teardown rework

Major rework of CM connection setup/teardown.  We had a number of issues
with MPI applications not starting/terminating properly over time.
With these changes we were able to run longer on larger clusters.

* Remove memory allocation from nes_connect() and nes_cm_connect().
* Fix mini_cm_dec_refcnt_listen() when destroying listener.
* Remove unnecessary code from schedule_nes_timer() and nes_cm_timer_tick().
* Functionalize mini_cm_recv_pkt() and process_packet().
* Clean up cm_node->ref_count usage.
* Reuse skbs if available.

Signed-off-by: Faisal Latif <flatif@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/infiniband/hw/nes/nes.c b/drivers/infiniband/hw/nes/nes.c
index d2884e778098..b0cab64e5e3d 100644
--- a/drivers/infiniband/hw/nes/nes.c
+++ b/drivers/infiniband/hw/nes/nes.c
@@ -276,6 +276,7 @@ static void nes_cqp_rem_ref_callback(struct nes_device *nesdev, struct nes_cqp_r
         }
         nes_free_resource(nesadapter, nesadapter->allocated_qps, nesqp->hwqp.qp_id);
 
+        nesadapter->qp_table[nesqp->hwqp.qp_id-NES_FIRST_QPN] = NULL;
         kfree(nesqp->allocated_buffer);
 
 }
@@ -289,7 +290,6 @@ void nes_rem_ref(struct ib_qp *ibqp)
         struct nes_qp *nesqp;
         struct nes_vnic *nesvnic = to_nesvnic(ibqp->device);
         struct nes_device *nesdev = nesvnic->nesdev;
-        struct nes_adapter *nesadapter = nesdev->nesadapter;
         struct nes_hw_cqp_wqe *cqp_wqe;
         struct nes_cqp_request *cqp_request;
         u32 opcode;
@@ -303,8 +303,6 @@ void nes_rem_ref(struct ib_qp *ibqp)
         }
 
         if (atomic_dec_and_test(&nesqp->refcount)) {
-                nesadapter->qp_table[nesqp->hwqp.qp_id-NES_FIRST_QPN] = NULL;
-
                 /* Destroy the QP */
                 cqp_request = nes_get_cqp_request(nesdev);
                 if (cqp_request == NULL) {