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RDMA/restrack: Count references to the verbs objects

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Refactor the restrack code to make sure the kref inside the restrack entry
properly kref's the object in which it is embedded. This slight change is
needed for future conversions of MR and QP which are refcounted before the
release and kfree.

The ideal flow from ib_core perspective as follows:
* Allocate ib_* structure with rdma_zalloc_*.
* Set everything that is known to ib_core to that newly created object.
* Initialize kref with restrack help
* Call to driver specific allocation functions.
* Insert into restrack DB
....
* Return and release restrack with restrack_put.

Largely this means a rdma_restrack_new() should be called near allocating
the containing structure.

Link: https://lore.kernel.org/r/20200922091106.2152715-4-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Leon Romanovsky
2020-09-22 12:11:04 +03:00
committed by Jason Gunthorpe
parent d7ecab1e5f
commit 13ef5539de
10 changed files with 70 additions and 38 deletions
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13
drivers/infiniband/core/uverbs_cmd.c
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@@ -218,10 +218,11 @@ int ib_alloc_ucontext(struct uverbs_attr_bundle *attrs)
if (!ucontext)
return -ENOMEM;
ucontext->res.type = RDMA_RESTRACK_CTX;
ucontext->device = ib_dev;
ucontext->ufile = ufile;
xa_init_flags(&ucontext->mmap_xa, XA_FLAGS_ALLOC);
rdma_restrack_new(&ucontext->res, RDMA_RESTRACK_CTX);
attrs->context = ucontext;
return 0;
}
@@ -313,6 +314,7 @@ static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
err_uobj:
rdma_alloc_abort_uobject(uobj, attrs, false);
err_ucontext:
rdma_restrack_put(&attrs->context->res);
kfree(attrs->context);
attrs->context = NULL;
return ret;
@@ -439,8 +441,8 @@ static int ib_uverbs_alloc_pd(struct uverbs_attr_bundle *attrs)
pd->device = ib_dev;
pd->uobject = uobj;
atomic_set(&pd->usecnt, 0);
pd->res.type = RDMA_RESTRACK_PD;
rdma_restrack_new(&pd->res, RDMA_RESTRACK_PD);
ret = ib_dev->ops.alloc_pd(pd, &attrs->driver_udata);
if (ret)
goto err_alloc;
@@ -453,6 +455,7 @@ static int ib_uverbs_alloc_pd(struct uverbs_attr_bundle *attrs)
return uverbs_response(attrs, &resp, sizeof(resp));
err_alloc:
rdma_restrack_put(&pd->res);
kfree(pd);
err:
uobj_alloc_abort(uobj, attrs);
@@ -742,8 +745,9 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs)
mr->sig_attrs = NULL;
mr->uobject = uobj;
atomic_inc(&pd->usecnt);
mr->res.type = RDMA_RESTRACK_MR;
mr->iova = cmd.hca_va;
rdma_restrack_new(&mr->res, RDMA_RESTRACK_MR);
rdma_restrack_uadd(&mr->res);
uobj->object = mr;
@@ -1002,8 +1006,8 @@ static int create_cq(struct uverbs_attr_bundle *attrs,
cq->event_handler = ib_uverbs_cq_event_handler;
cq->cq_context = ev_file ? &ev_file->ev_queue : NULL;
atomic_set(&cq->usecnt, 0);
cq->res.type = RDMA_RESTRACK_CQ;
rdma_restrack_new(&cq->res, RDMA_RESTRACK_CQ);
ret = ib_dev->ops.create_cq(cq, &attr, &attrs->driver_udata);
if (ret)
goto err_free;
@@ -1021,6 +1025,7 @@ static int create_cq(struct uverbs_attr_bundle *attrs,
return uverbs_response(attrs, &resp, sizeof(resp));
err_free:
rdma_restrack_put(&cq->res);
kfree(cq);
err_file:
if (ev_file)