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
21struct smcd_dev_list {	/* List of SMCD devices */
22	struct list_head list;
23	struct mutex mutex;	/* Protects list of devices */
24};
25
26extern struct smcd_dev_list	smcd_dev_list;	/* list of smcd devices */
27
28struct 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
34struct smc_ism_seid {
35	u8 seid_string[24];
36	u8 serial_number[4];
37	u8 type[4];
38};
39
40struct smcd_dev;
41
42int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
43		    struct smcd_dev *dev);
44void smc_ism_set_conn(struct smc_connection *conn);
45void smc_ism_unset_conn(struct smc_connection *conn);
46int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
47int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
48int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
49			 struct smc_buf_desc *dmb_desc);
50int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
51bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd);
52int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
53		       struct smc_buf_desc *dmb_desc);
54int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token);
55int smc_ism_signal_shutdown(struct smc_link_group *lgr);
56void smc_ism_get_system_eid(u8 **eid);
57u16 smc_ism_get_chid(struct smcd_dev *dev);
58bool smc_ism_is_v2_capable(void);
59void smc_ism_set_v2_capable(void);
60int smc_ism_init(void);
61void smc_ism_exit(void);
62int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
63
64static 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
74static 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
85static 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
92static inline bool smc_ism_is_loopback(struct smcd_dev *smcd)
93{
94	return (smcd->ops->get_chid(smcd) == 0xFFFF);
95}
96
97#endif