RDMA/uverbs: Add CQ buffer UMEM attribute and driver helpers

Add UVERBS_ATTR_CREATE_CQ_BUF_UMEM and two driver-facing
wrappers, ib_umem_get_cq_buf() and ib_umem_get_cq_buf_or_va(),
that pin a CQ buffer umem from it. The wrappers reuse the
existing legacy CQ buffer-attr filler.

Link: https://patch.msgid.link/r/20260529134312.2836341-7-jiri@resnulli.us
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index 0d6e90a35f3a..492c8d365730 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -90,6 +90,12 @@ struct ib_umem *ib_umem_get_attr_or_va(struct ib_device *device,
 				       const struct uverbs_attr_bundle *attrs,
 				       u16 attr_id, u64 addr, size_t size,
 				       int access);
+struct ib_umem *ib_umem_get_cq_buf(struct ib_device *device,
+				   const struct uverbs_attr_bundle *attrs,
+				   size_t size, int access);
+struct ib_umem *ib_umem_get_cq_buf_or_va(struct ib_device *device,
+					 const struct uverbs_attr_bundle *attrs,
+					 u64 addr, size_t size, int access);
 struct ib_umem *ib_umem_get_cq_tmp(struct ib_device *device,
 				   struct uverbs_attr_bundle *attrs);
 
@@ -210,6 +216,20 @@ ib_umem_get_attr_or_va(struct ib_device *device,
 	return ERR_PTR(-EOPNOTSUPP);
 }
 static inline struct ib_umem *
+ib_umem_get_cq_buf(struct ib_device *device,
+		   const struct uverbs_attr_bundle *attrs, size_t size,
+		   int access)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+static inline struct ib_umem *
+ib_umem_get_cq_buf_or_va(struct ib_device *device,
+			 const struct uverbs_attr_bundle *attrs, u64 addr,
+			 size_t size, int access)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+static inline struct ib_umem *
 ib_umem_get_cq_tmp(struct ib_device *device, struct uverbs_attr_bundle *attrs)
 {
 	return ERR_PTR(-EOPNOTSUPP);