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ibcore: Implement ib_uverbs_get_ucontext_file().

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Expose ib_ucontext from a given ib_uverbs_file. Drivers that use the ioctl(9)
API may have the ib_uverbs_file and need a way to get the related ib_ucontext
from it, this is enabled by this patch.

Downstream patches from this series will use it.

Linux commit:
7dc08dcfc8c86cb4457e383734ff6844ddaff876

MFC after:	1 week
Reviewed by:	kib
Sponsored by:	Mellanox Technologies // NVIDIA Networking
This commit is contained in:
Hans Petter Selasky 2021-06-16 15:01:51 +02:00
parent 05f4691919
commit 79b817084c
2 changed files with 27 additions and 0 deletions
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24
sys/ofed/drivers/infiniband/core/ib_uverbs_main.c
View File

@ -146,6 +146,30 @@ static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
/*
* Must be called with the ufile->device->disassociate_srcu held, and the lock
* must be held until use of the ucontext is finished.
*/
struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
{
/*
* We do not hold the hw_destroy_rwsem lock for this flow, instead
* srcu is used. It does not matter if someone races this with
* get_context, we get NULL or valid ucontext.
*/
struct ib_ucontext *ucontext = READ_ONCE(ufile->ucontext);
if (!srcu_dereference(ufile->device->ib_dev,
&ufile->device->disassociate_srcu))
return ERR_PTR(-EIO);
if (!ucontext)
return ERR_PTR(-EINVAL);
return ucontext;
}
EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
int uverbs_dealloc_mw(struct ib_mw *mw)
{
struct ib_pd *pd = mw->pd;

3
sys/ofed/include/rdma/ib_verbs.h
View File

@ -67,6 +67,7 @@
struct ifla_vf_info;
struct ifla_vf_stats;
struct ib_uverbs_file;
extern struct workqueue_struct *ib_wq;
extern struct workqueue_struct *ib_comp_wq;
@ -3390,6 +3391,8 @@ void ib_drain_rq(struct ib_qp *qp);
void ib_drain_sq(struct ib_qp *qp);
void ib_drain_qp(struct ib_qp *qp);
struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile);
int ib_resolve_eth_dmac(struct ib_device *device,
struct ib_ah_attr *ah_attr);
#endif /* IB_VERBS_H */