include/net/smc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  Definitions for the SMC module (socket related)
   6  *
   7  *  Copyright IBM Corp. 2016
   8  *
   9  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  10  */
  11 #ifndef _SMC_H
  12 #define _SMC_H
  13
  14 #define SMC_MAX_PNETID_LEN      16      /* Max. length of PNET id */
  15
  16 struct smc_hashinfo {
  17         rwlock_t lock;
  18         struct hlist_head ht;
  19 };
  20
  21 int smc_hash_sk(struct sock *sk);
  22 void smc_unhash_sk(struct sock *sk);
  23
  24 /* SMCD/ISM device driver interface */
  25 struct smcd_dmb {
  26         u64 dmb_tok;
  27         u64 rgid;
  28         u32 dmb_len;
  29         u32 sba_idx;
  30         u32 vlan_valid;
  31         u32 vlan_id;
  32         void *cpu_addr;
  33         dma_addr_t dma_addr;
  34 };
  35
  36 #define ISM_EVENT_DMB   0
  37 #define ISM_EVENT_GID   1
  38 #define ISM_EVENT_SWR   2
  39
  40 #define ISM_ERROR       0xFFFF
  41
  42 struct smcd_event {
  43         u32 type;
  44         u32 code;
  45         u64 tok;
  46         u64 time;
  47         u64 info;
  48 };
  49
  50 struct smcd_dev;
  51
  52 struct smcd_ops {
  53         int (*query_remote_gid)(struct smcd_dev *dev, u64 rgid, u32 vid_valid,
  54                                 u32 vid);
  55         int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
  56         int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
  57         int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
  58         int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
  59         int (*set_vlan_required)(struct smcd_dev *dev);
  60         int (*reset_vlan_required)(struct smcd_dev *dev);
  61         int (*signal_event)(struct smcd_dev *dev, u64 rgid, u32 trigger_irq,
  62                             u32 event_code, u64 info);
  63         int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
  64                          bool sf, unsigned int offset, void *data,
  65                          unsigned int size);
  66 };
  67
  68 struct smcd_dev {
  69         const struct smcd_ops *ops;
  70         struct device dev;
  71         void *priv;
  72         u64 local_gid;
  73         struct list_head list;
  74         spinlock_t lock;
  75         struct smc_connection **conn;
  76         struct list_head vlan;
  77         struct workqueue_struct *event_wq;
  78         u8 pnetid[SMC_MAX_PNETID_LEN];
  79         bool pnetid_by_user;
  80         struct list_head lgr_list;
  81         spinlock_t lgr_lock;
  82         atomic_t lgr_cnt;
  83         wait_queue_head_t lgrs_deleted;
  84         u8 going_away : 1;
  85 };
  86
  87 struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
  88                                 const struct smcd_ops *ops, int max_dmbs);
  89 int smcd_register_dev(struct smcd_dev *smcd);
  90 void smcd_unregister_dev(struct smcd_dev *smcd);
  91 void smcd_free_dev(struct smcd_dev *smcd);
  92 void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
  93 void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit);
  94 #endif  /* _SMC_H */