fs/ksmbd/transport_rdma.h

   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 SMB_DIRECT_PORT 5445
  11
  12 /* SMB DIRECT negotiation request packet [MS-SMBD] 2.2.1 */
  13 struct smb_direct_negotiate_req {
  14         __le16 min_version;
  15         __le16 max_version;
  16         __le16 reserved;
  17         __le16 credits_requested;
  18         __le32 preferred_send_size;
  19         __le32 max_receive_size;
  20         __le32 max_fragmented_size;
  21 } __packed;
  22
  23 /* SMB DIRECT negotiation response packet [MS-SMBD] 2.2.2 */
  24 struct smb_direct_negotiate_resp {
  25         __le16 min_version;
  26         __le16 max_version;
  27         __le16 negotiated_version;
  28         __le16 reserved;
  29         __le16 credits_requested;
  30         __le16 credits_granted;
  31         __le32 status;
  32         __le32 max_readwrite_size;
  33         __le32 preferred_send_size;
  34         __le32 max_receive_size;
  35         __le32 max_fragmented_size;
  36 } __packed;
  37
  38 #define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
  39
  40 /* SMB DIRECT data transfer packet with payload [MS-SMBD] 2.2.3 */
  41 struct smb_direct_data_transfer {
  42         __le16 credits_requested;
  43         __le16 credits_granted;
  44         __le16 flags;
  45         __le16 reserved;
  46         __le32 remaining_data_length;
  47         __le32 data_offset;
  48         __le32 data_length;
  49         __le32 padding;
  50         __u8 buffer[];
  51 } __packed;
  52
  53 #ifdef CONFIG_SMB_SERVER_SMBDIRECT
  54 int ksmbd_rdma_init(void);
  55 int ksmbd_rdma_destroy(void);
  56 bool ksmbd_rdma_capable_netdev(struct net_device *netdev);
  57 #else
  58 static inline int ksmbd_rdma_init(void) { return 0; }
  59 static inline int ksmbd_rdma_destroy(void) { return 0; }
  60 static inline bool ksmbd_rdma_capable_netdev(struct net_device *netdev) { return false; }
  61 #endif
  62
  63 #endif /* __KSMBD_TRANSPORT_RDMA_H__ */