[PATCH rdma-next 04/13] RDMA/core: Add cryptographic device capabilities

[Leon Romanovsky <leon@kernel.org>]

From: Israel Rukshin <israelr@nvidia.com>

Some advanced RDMA devices have HW engines with cryptographic
capabilities. Those devices can encrypt/decrypt data when transmitting
from memory domain to wire domain and when receiving data from wire
domain to memory domain. Expose these capabilities via common RDMA
device attributes. For now, add only AES-XTS cryptographic support.

Signed-off-by: Israel Rukshin <israelr@nvidia.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
---
 include/rdma/crypto.h   | 37 +++++++++++++++++++++++++++++++++++++
 include/rdma/ib_verbs.h |  2 ++
 2 files changed, 39 insertions(+)
 create mode 100644 include/rdma/crypto.h

diff --git a/include/rdma/crypto.h b/include/rdma/crypto.h
new file mode 100644
index 000000000000..4779eacb000e
--- /dev/null
+++ b/include/rdma/crypto.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/*
+ * Copyright (c) 2022, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ */
+
+#ifndef _RDMA_CRYPTO_H_
+#define _RDMA_CRYPTO_H_
+
+#include <linux/types.h>
+
+/**
+ * Encryption and decryption operations are done by attaching crypto properties
+ * to a memory region. Once done, every access to the memory via the crypto
+ * memory region will result in inline encryption or decryption of the data
+ * by the RDMA device. The crypto properties contain the Data Encryption Key
+ * (DEK) and the crypto standard that should be used and its attributes.
+ */
+
+/**
+ * Cryptographic engines in clear text mode capabilities.
+ * @IB_CRYPTO_ENGINES_CAP_AES_XTS: Support AES-XTS engine.
+ */
+enum {
+	IB_CRYPTO_ENGINES_CAP_AES_XTS = 1 << 0,
+};
+
+/**
+ * struct ib_crypto_caps - Cryptographic capabilities
+ * @crypto_engines: From enum ib_crypto_engines_cap_bits.
+ * @max_num_deks: Maximum number of Data Encryption Keys.
+ */
+struct ib_crypto_caps {
+	u32 crypto_engines;
+	u32 max_num_deks;
+};
+
+#endif /* _RDMA_CRYPTO_H_ */
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index cc2ddd4e6c12..83be7e49c5f7 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -40,6 +40,7 @@
 #include <rdma/rdma_counter.h>
 #include <rdma/restrack.h>
 #include <rdma/signature.h>
+#include <rdma/crypto.h>
 #include <uapi/rdma/rdma_user_ioctl.h>
 #include <uapi/rdma/ib_user_ioctl_verbs.h>
 
@@ -450,6 +451,7 @@ struct ib_device_attr {
 	u64			max_dm_size;
 	/* Max entries for sgl for optimized performance per READ */
 	u32			max_sgl_rd;
+	struct ib_crypto_caps	crypto_caps;
 };
 
 enum ib_mtu {
-- 
2.39.0