IB: Support ib_flow creation in drivers

This patch considers the case that ib_flow is created by some device
driver with its specific parameters using the KABI infrastructure.

In that case both QP and ib_uflow_resources might not be applicable.
Downstream patches from this series use the above functionality.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index bd6eefa..987ee38 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2771,6 +2771,9 @@ void ib_uverbs_flow_resources_free(struct ib_uflow_resources *uflow_res)
 {
        unsigned int i;
 
+       if (!uflow_res)
+               return;
+
        for (i = 0; i < uflow_res->collection_num; i++)
                atomic_dec(&uflow_res->collection[i]->usecnt);
 
@@ -3585,6 +3588,7 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
        }
        atomic_inc(&qp->usecnt);
        flow_id->qp = qp;
+       flow_id->device = qp->device;
        flow_id->uobject = uobj;
        uobj->object = flow_id;
        uflow = container_of(uobj, typeof(*uflow), uobject);

diff --git a/drivers/infiniband/core/uverbs_std_types.c b/drivers/infiniband/core/uverbs_std_types.c
index 718c843..c1e0492 100644 (file)
--- a/drivers/infiniband/core/uverbs_std_types.c
+++ b/drivers/infiniband/core/uverbs_std_types.c
@@ -54,9 +54,10 @@ static int uverbs_free_flow(struct ib_uobject *uobject,
        struct ib_qp *qp = flow->qp;
        int ret;
 
-       ret = qp->device->destroy_flow(flow);
+       ret = flow->device->destroy_flow(flow);
        if (!ret) {
-               atomic_dec(&qp->usecnt);
+               if (qp)
+                       atomic_dec(&qp->usecnt);
                ib_uverbs_flow_resources_free(uflow->resources);
        }
 

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 08348e5..24d6ec3 100644 (file)
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2081,6 +2081,7 @@ struct ib_flow_attr {
 
 struct ib_flow {
        struct ib_qp            *qp;
+       struct ib_device        *device;
        struct ib_uobject       *uobject;
 };