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 #include <linux/device.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/types.h>
  17 #include <linux/wait.h>
  18 #include "linux/ism.h"
  19
  20 struct sock;
  21
  22 #define SMC_MAX_PNETID_LEN      16      /* Max. length of PNET id */
  23
  24 struct smc_hashinfo {
  25         rwlock_t lock;
  26         struct hlist_head ht;
  27 };
  28
  29 /* SMCD/ISM device driver interface */
  30 struct smcd_dmb {
  31         u64 dmb_tok;
  32         u64 rgid;
  33         u32 dmb_len;
  34         u32 sba_idx;
  35         u32 vlan_valid;
  36         u32 vlan_id;
  37         void *cpu_addr;
  38         dma_addr_t dma_addr;
  39 };
  40
  41 #define ISM_EVENT_DMB   0
  42 #define ISM_EVENT_GID   1
  43 #define ISM_EVENT_SWR   2
  44
  45 #define ISM_RESERVED_VLANID     0x1FFF
  46
  47 #define ISM_ERROR       0xFFFF
  48
  49 struct smcd_dev;
  50
  51 struct smcd_gid {
  52         u64     gid;
  53         u64     gid_ext;
  54 };
  55
  56 struct smcd_ops {
  57         int (*query_remote_gid)(struct smcd_dev *dev, struct smcd_gid *rgid,
  58                                 u32 vid_valid, u32 vid);
  59         int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb,
  60                             void *client);
  61         int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
  62         int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
  63                          bool sf, unsigned int offset, void *data,
  64                          unsigned int size);
  65         int (*supports_v2)(void);
  66         void (*get_local_gid)(struct smcd_dev *dev, struct smcd_gid *gid);
  67         u16 (*get_chid)(struct smcd_dev *dev);
  68         struct device* (*get_dev)(struct smcd_dev *dev);
  69
  70         /* optional operations */
  71         int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
  72         int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
  73         int (*set_vlan_required)(struct smcd_dev *dev);
  74         int (*reset_vlan_required)(struct smcd_dev *dev);
  75         int (*signal_event)(struct smcd_dev *dev, struct smcd_gid *rgid,
  76                             u32 trigger_irq, u32 event_code, u64 info);
  77         int (*support_dmb_nocopy)(struct smcd_dev *dev);
  78         int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
  79         int (*detach_dmb)(struct smcd_dev *dev, u64 token);
  80 };
  81
  82 struct smcd_dev {
  83         const struct smcd_ops *ops;
  84         void *priv;
  85         void *client;
  86         struct list_head list;
  87         spinlock_t lock;
  88         struct smc_connection **conn;
  89         struct list_head vlan;
  90         struct workqueue_struct *event_wq;
  91         u8 pnetid[SMC_MAX_PNETID_LEN];
  92         bool pnetid_by_user;
  93         struct list_head lgr_list;
  94         spinlock_t lgr_lock;
  95         atomic_t lgr_cnt;
  96         wait_queue_head_t lgrs_deleted;
  97         u8 going_away : 1;
  98 };
  99
 100 #endif  /* _SMC_H */