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
98
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