RDMA/mana_ib: Add device‑memory support

Introduce a basic DM implementation that enables creating and
registering device memory, and using the associated memory keys
for networking operations.

Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
Link: https://patch.msgid.link/20260127082649.429018-1-kotaranov@linux.microsoft.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

1 files changed, 44 insertions, 3 deletions

diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index eaa27483f99b..8649eb789c0e 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -35,6 +35,8 @@ enum gdma_request_type {
 	GDMA_CREATE_MR			= 31,
 	GDMA_DESTROY_MR			= 32,
 	GDMA_QUERY_HWC_TIMEOUT		= 84, /* 0x54 */
+	GDMA_ALLOC_DM			= 96, /* 0x60 */
+	GDMA_DESTROY_DM			= 97, /* 0x61 */
 };
 
 #define GDMA_RESOURCE_DOORBELL_PAGE	27
@@ -861,6 +863,8 @@ enum gdma_mr_type {
 	GDMA_MR_TYPE_GVA = 2,
 	/* Guest zero-based address MRs */
 	GDMA_MR_TYPE_ZBVA = 4,
+	/* Device address MRs */
+	GDMA_MR_TYPE_DM = 5,
 };
 
 struct gdma_create_mr_params {
@@ -876,6 +880,12 @@ struct gdma_create_mr_params {
 			u64 dma_region_handle;
 			enum gdma_mr_access_flags access_flags;
 		} zbva;
+		struct {
+			u64 dm_handle;
+			u64 offset;
+			u64 length;
+			enum gdma_mr_access_flags access_flags;
+		} da;
 	};
 };
 
@@ -890,13 +900,23 @@ struct gdma_create_mr_request {
 			u64 dma_region_handle;
 			u64 virtual_address;
 			enum gdma_mr_access_flags access_flags;
-		} gva;
+		} __packed gva;
 		struct {
 			u64 dma_region_handle;
 			enum gdma_mr_access_flags access_flags;
-		} zbva;
-	};
+		} __packed zbva;
+		struct {
+			u64 dm_handle;
+			u64 offset;
+			enum gdma_mr_access_flags access_flags;
+		} __packed da;
+	} __packed;
 	u32 reserved_2;
+	union {
+		struct {
+			u64 length;
+		} da_ext;
+	};
 };/* HW DATA */
 
 struct gdma_create_mr_response {
@@ -915,6 +935,27 @@ struct gdma_destroy_mr_response {
 	struct gdma_resp_hdr hdr;
 };/* HW DATA */
 
+struct gdma_alloc_dm_req {
+	struct gdma_req_hdr hdr;
+	u64 length;
+	u32 alignment;
+	u32 flags;
+}; /* HW Data */
+
+struct gdma_alloc_dm_resp {
+	struct gdma_resp_hdr hdr;
+	u64 dm_handle;
+}; /* HW Data */
+
+struct gdma_destroy_dm_req {
+	struct gdma_req_hdr hdr;
+	u64 dm_handle;
+}; /* HW Data */
+
+struct gdma_destroy_dm_resp {
+	struct gdma_resp_hdr hdr;
+}; /* HW Data */
+
 int mana_gd_verify_vf_version(struct pci_dev *pdev);
 
 int mana_gd_register_device(struct gdma_dev *gd);