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 bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd);
  52 int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
  53                        struct smc_buf_desc *dmb_desc);
  54 int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token);
  55 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
  56 void smc_ism_get_system_eid(u8 **eid);
  57 u16 smc_ism_get_chid(struct smcd_dev *dev);
  58 bool smc_ism_is_v2_capable(void);
  59 void smc_ism_set_v2_capable(void);
  60 int smc_ism_init(void);
  61 void smc_ism_exit(void);
  62 int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
  63
  64 static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
  65                                 unsigned int idx, bool sf, unsigned int offset,
  66                                 void *data, size_t len)
  67 {
  68         int rc;
  69
  70         rc = smcd->ops->move_data(smcd, dmb_tok, idx, sf, offset, data, len);
  71         return rc < 0 ? rc : 0;
  72 }
  73
  74 static inline bool __smc_ism_is_emulated(u16 chid)
  75 {
  76         /* CHIDs in range of 0xFF00 to 0xFFFF are reserved
  77          * for Emulated-ISM device.
  78          *
  79          * loopback-ism:        0xFFFF
  80          * virtio-ism:          0xFF00 ~ 0xFFFE
  81          */
  82         return ((chid & 0xFF00) == 0xFF00);
  83 }
  84
  85 static inline bool smc_ism_is_emulated(struct smcd_dev *smcd)
  86 {
  87         u16 chid = smcd->ops->get_chid(smcd);
  88
  89         return __smc_ism_is_emulated(chid);
  90 }
  91
  92 static inline bool smc_ism_is_loopback(struct smcd_dev *smcd)
  93 {
  94         return (smcd->ops->get_chid(smcd) == 0xFFFF);
  95 }
  96
  97 #endif