1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 *   Copyright (C) 2017, Microsoft Corporation.
 4 *   Copyright (C) 2018, LG Electronics.
 5 */
 6
 7#ifndef __KSMBD_TRANSPORT_RDMA_H__
 8#define __KSMBD_TRANSPORT_RDMA_H__
 9
10#define SMBD_DEFAULT_IOSIZE (8 * 1024 * 1024)
11#define SMBD_MIN_IOSIZE (512 * 1024)
12#define SMBD_MAX_IOSIZE (16 * 1024 * 1024)
13
14/* SMB DIRECT negotiation request packet [MS-SMBD] 2.2.1 */
15struct smb_direct_negotiate_req {
16	__le16 min_version;
17	__le16 max_version;
18	__le16 reserved;
19	__le16 credits_requested;
20	__le32 preferred_send_size;
21	__le32 max_receive_size;
22	__le32 max_fragmented_size;
23} __packed;
24
25/* SMB DIRECT negotiation response packet [MS-SMBD] 2.2.2 */
26struct smb_direct_negotiate_resp {
27	__le16 min_version;
28	__le16 max_version;
29	__le16 negotiated_version;
30	__le16 reserved;
31	__le16 credits_requested;
32	__le16 credits_granted;
33	__le32 status;
34	__le32 max_readwrite_size;
35	__le32 preferred_send_size;
36	__le32 max_receive_size;
37	__le32 max_fragmented_size;
38} __packed;
39
40#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
41
42/* SMB DIRECT data transfer packet with payload [MS-SMBD] 2.2.3 */
43struct smb_direct_data_transfer {
44	__le16 credits_requested;
45	__le16 credits_granted;
46	__le16 flags;
47	__le16 reserved;
48	__le32 remaining_data_length;
49	__le32 data_offset;
50	__le32 data_length;
51	__le32 padding;
52	__u8 buffer[];
53} __packed;
54
55#ifdef CONFIG_SMB_SERVER_SMBDIRECT
56int ksmbd_rdma_init(void);
57void ksmbd_rdma_destroy(void);
58bool ksmbd_rdma_capable_netdev(struct net_device *netdev);
59void init_smbd_max_io_size(unsigned int sz);
60unsigned int get_smbd_max_read_write_size(void);
61#else
62static inline int ksmbd_rdma_init(void) { return 0; }
63static inline int ksmbd_rdma_destroy(void) { return 0; }
64static inline bool ksmbd_rdma_capable_netdev(struct net_device *netdev) { return false; }
65static inline void init_smbd_max_io_size(unsigned int sz) { }
66static inline unsigned int get_smbd_max_read_write_size(void) { return 0; }
67#endif
68
69#endif /* __KSMBD_TRANSPORT_RDMA_H__ */