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_VIRTUAL_ISM_CHID_MASK 0xFF00
19
20 struct smcd_dev_list { /* List of SMCD devices */
21 struct list_head list;
22 struct mutex mutex; /* Protects list of devices */
23 };
24
25 extern struct smcd_dev_list smcd_dev_list; /* list of smcd devices */
26
27 struct smc_ism_vlanid { /* VLAN id set on ISM device */
28 struct list_head list;
29 unsigned short vlanid; /* Vlan id */
30 refcount_t refcnt; /* Reference count */
31 };
32
33 struct smcd_dev;
34
35 int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
36 struct smcd_dev *dev);
37 void smc_ism_set_conn(struct smc_connection *conn);
38 void smc_ism_unset_conn(struct smc_connection *conn);
39 int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
40 int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
41 int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
42 struct smc_buf_desc *dmb_desc);
43 int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
44 bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd);
45 int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
46 struct smc_buf_desc *dmb_desc);
47 int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token);
48 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
49 void smc_ism_get_system_eid(u8 **eid);
50 u16 smc_ism_get_chid(struct smcd_dev *dev);
51 bool smc_ism_is_v2_capable(void);
52 int smc_ism_init(void);
53 void smc_ism_exit(void);
54 int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
55
smc_ism_write(struct smcd_dev * smcd,u64 dmb_tok,unsigned int idx,bool sf,unsigned int offset,void * data,size_t len)56 static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
57 unsigned int idx, bool sf, unsigned int offset,
58 void *data, size_t len)
59 {
60 int rc;
61
62 rc = smcd->ops->move_data(smcd, dmb_tok, idx, sf, offset, data, len);
63 return rc < 0 ? rc : 0;
64 }
65
__smc_ism_is_virtual(u16 chid)66 static inline bool __smc_ism_is_virtual(u16 chid)
67 {
68 /* CHIDs in range of 0xFF00 to 0xFFFF are reserved
69 * for virtual ISM device.
70 *
71 * loopback-ism: 0xFFFF
72 * virtio-ism: 0xFF00 ~ 0xFFFE
73 */
74 return ((chid & 0xFF00) == 0xFF00);
75 }
76
smc_ism_is_virtual(struct smcd_dev * smcd)77 static inline bool smc_ism_is_virtual(struct smcd_dev *smcd)
78 {
79 u16 chid = smcd->ops->get_chid(smcd);
80
81 return __smc_ism_is_virtual(chid);
82 }
83
84 #endif
85