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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 0x000141 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_SMBDIRECT56int 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#else62static 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#endif68 69#endif /* __KSMBD_TRANSPORT_RDMA_H__ */70