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 struct smcd_dev_list {	/* List of SMCD devices */
19 	struct list_head list;
20 	struct mutex mutex;	/* Protects list of devices */
21 };
22 
23 extern struct smcd_dev_list	smcd_dev_list;	/* list of smcd devices */
24 
25 struct smc_ism_vlanid {			/* VLAN id set on ISM device */
26 	struct list_head list;
27 	unsigned short vlanid;		/* Vlan id */
28 	refcount_t refcnt;		/* Reference count */
29 };
30 
31 struct smc_ism_position {	/* ISM device position to write to */
32 	u64 token;		/* Token of DMB */
33 	u32 offset;		/* Offset into DMBE */
34 	u8 index;		/* Index of DMBE */
35 	u8 signal;		/* Generate interrupt on owner side */
36 };
37 
38 struct smcd_dev;
39 
40 int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *dev);
41 void smc_ism_set_conn(struct smc_connection *conn);
42 void smc_ism_unset_conn(struct smc_connection *conn);
43 int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
44 int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
45 int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
46 			 struct smc_buf_desc *dmb_desc);
47 int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
48 int smc_ism_write(struct smcd_dev *dev, const struct smc_ism_position *pos,
49 		  void *data, size_t len);
50 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
51 void smc_ism_get_system_eid(u8 **eid);
52 u16 smc_ism_get_chid(struct smcd_dev *dev);
53 bool smc_ism_is_v2_capable(void);
54 void smc_ism_init(void);
55 int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
56 #endif
57