net/smc/smc_ism.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Shared Memory Communications Direct over ISM devices (SMC-D)
   3  *
   4  * SMC-D ISM device structure definitions.
   5  *
   6  * Copyright IBM Corp. 2018
   7  */
   8
   9 #ifndef SMCD_ISM_H
  10 #define SMCD_ISM_H
  11
  12 #include <linux/uio.h>
  13 #include <linux/types.h>
  14 #include <linux/mutex.h>
  15
  16 #include "smc.h"
  17
  18 #define SMC_EMULATED_ISM_CHID_MASK      0xFF00
  19 #define SMC_ISM_IDENT_MASK              0x00FFFF
  20
  21 struct smcd_dev_list {  /* List of SMCD devices */
  22         struct list_head list;
  23         struct mutex mutex;     /* Protects list of devices */
  24 };
  25
  26 extern struct smcd_dev_list     smcd_dev_list;  /* list of smcd devices */
  27
  28 struct smc_ism_vlanid {                 /* VLAN id set on ISM device */
  29         struct list_head list;
  30         unsigned short vlanid;          /* Vlan id */
  31         refcount_t refcnt;              /* Reference count */
  32 };
  33
  34 struct smc_ism_seid {
  35         u8 seid_string[24];
  36         u8 serial_number[4];
  37         u8 type[4];
  38 };
  39
  40 struct smcd_dev;
  41
  42 int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
  43                     struct smcd_dev *dev);
  44 void smc_ism_set_conn(struct smc_connection *conn);
  45 void smc_ism_unset_conn(struct smc_connection *conn);
  46 int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
  47 int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
  48 int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
  49                          struct smc_buf_desc *dmb_desc);
  50 int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
  51 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
  52 void smc_ism_get_system_eid(u8 **eid);
  53 u16 smc_ism_get_chid(struct smcd_dev *dev);
  54 bool smc_ism_is_v2_capable(void);
  55 int smc_ism_init(void);
  56 void smc_ism_exit(void);
  57 int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
  58
  59 static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
  60                                 unsigned int idx, bool sf, unsigned int offset,
  61                                 void *data, size_t len)
  62 {
  63         int rc;
  64
  65         rc = smcd->ops->move_data(smcd, dmb_tok, idx, sf, offset, data, len);
  66         return rc < 0 ? rc : 0;
  67 }
  68
  69 static inline bool __smc_ism_is_emulated(u16 chid)
  70 {
  71         /* CHIDs in range of 0xFF00 to 0xFFFF are reserved
  72          * for Emulated-ISM device.
  73          *
  74          * loopback-ism:        0xFFFF
  75          * virtio-ism:          0xFF00 ~ 0xFFFE
  76          */
  77         return ((chid & 0xFF00) == 0xFF00);
  78 }
  79
  80 static inline bool smc_ism_is_emulated(struct smcd_dev *smcd)
  81 {
  82         u16 chid = smcd->ops->get_chid(smcd);
  83
  84         return __smc_ism_is_emulated(chid);
  85 }
  86
  87 #endif