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/mutex.h>
  14
  15 #include "smc.h"
  16
  17 struct smcd_dev_list {  /* List of SMCD devices */
  18         struct list_head list;
  19         struct mutex mutex;     /* Protects list of devices */
  20 };
  21
  22 extern struct smcd_dev_list     smcd_dev_list; /* list of smcd devices */
  23
  24 struct smc_ism_vlanid {                 /* VLAN id set on ISM device */
  25         struct list_head list;
  26         unsigned short vlanid;          /* Vlan id */
  27         refcount_t refcnt;              /* Reference count */
  28 };
  29
  30 struct smc_ism_position {       /* ISM device position to write to */
  31         u64 token;              /* Token of DMB */
  32         u32 offset;             /* Offset into DMBE */
  33         u8 index;               /* Index of DMBE */
  34         u8 signal;              /* Generate interrupt on owner side */
  35 };
  36
  37 struct smcd_dev;
  38
  39 int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *dev);
  40 void smc_ism_set_conn(struct smc_connection *conn);
  41 void smc_ism_unset_conn(struct smc_connection *conn);
  42 int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
  43 int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
  44 int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
  45                          struct smc_buf_desc *dmb_desc);
  46 int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
  47 int smc_ism_write(struct smcd_dev *dev, const struct smc_ism_position *pos,
  48                   void *data, size_t len);
  49 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
  50 #endif