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IB/verbs: Add helper function rdma_udata_to_drv_context
Helper function to get driver's context out of ib_udata wrapped in uverbs_attr_bundle for user objects or NULL for kernel objects. Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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@ -664,6 +664,23 @@ static inline bool uverbs_attr_is_valid(const struct uverbs_attr_bundle *attrs_b
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attrs_bundle->attr_present);
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}
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/**
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* rdma_udata_to_drv_context - Helper macro to get the driver's context out of
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* ib_udata which is embedded in uverbs_attr_bundle.
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*
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* If udata is not NULL this cannot fail. Otherwise a NULL udata will result
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* in a NULL ucontext pointer, as a safety precaution. Callers should be using
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* 'udata' to determine if the driver call is in user or kernel mode, not
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* 'ucontext'.
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*
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*/
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#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
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(udata ? container_of(container_of(udata, struct uverbs_attr_bundle, \
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driver_udata) \
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->context, \
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drv_dev_struct, member) : \
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(drv_dev_struct *)NULL)
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#define IS_UVERBS_COPY_ERR(_ret) ((_ret) && (_ret) != -ENOENT)
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static inline const struct uverbs_attr *uverbs_attr_get(const struct uverbs_attr_bundle *attrs_bundle,
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