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