smc_ism.h

  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#include <linux/dibs.h>
 16
 17#include "smc.h"
 18
 19#define SMC_EMULATED_ISM_CHID_MASK	0xFF00
 20#define SMC_ISM_IDENT_MASK		0x00FFFF
 21
 22struct smcd_dev_list {	/* List of SMCD devices */
 23	struct list_head list;
 24	struct mutex mutex;	/* Protects list of devices */
 25};
 26
 27extern struct smcd_dev_list	smcd_dev_list;	/* list of smcd devices */
 28
 29struct smc_ism_vlanid {			/* VLAN id set on ISM device */
 30	struct list_head list;
 31	unsigned short vlanid;		/* Vlan id */
 32	refcount_t refcnt;		/* Reference count */
 33};
 34
 35struct smc_ism_seid {
 36	u8 seid_string[24];
 37	u8 serial_number[4];
 38	u8 type[4];
 39};
 40
 41struct smcd_dev;
 42
 43int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
 44		    struct smcd_dev *dev);
 45void smc_ism_set_conn(struct smc_connection *conn);
 46void smc_ism_unset_conn(struct smc_connection *conn);
 47int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
 48int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
 49int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
 50			 struct smc_buf_desc *dmb_desc);
 51void smc_ism_unregister_dmb(struct smcd_dev *dev,
 52			    struct smc_buf_desc *dmb_desc);
 53bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd);
 54int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
 55		       struct smc_buf_desc *dmb_desc);
 56int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token);
 57int smc_ism_signal_shutdown(struct smc_link_group *lgr);
 58void smc_ism_get_system_eid(u8 **eid);
 59u16 smc_ism_get_chid(struct smcd_dev *dev);
 60bool smc_ism_is_v2_capable(void);
 61void smc_ism_set_v2_capable(void);
 62int smc_ism_init(void);
 63void smc_ism_exit(void);
 64int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
 65
 66static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
 67				unsigned int idx, bool sf, unsigned int offset,
 68				void *data, size_t len)
 69{
 70	int rc;
 71
 72	rc = smcd->dibs->ops->move_data(smcd->dibs, dmb_tok, idx, sf, offset,
 73				       data, len);
 74
 75	return rc < 0 ? rc : 0;
 76}
 77
 78static inline bool __smc_ism_is_emulated(u16 chid)
 79{
 80	/* CHIDs in range of 0xFF00 to 0xFFFF are reserved
 81	 * for Emulated-ISM device.
 82	 *
 83	 * loopback-ism:	0xFFFF
 84	 * virtio-ism:		0xFF00 ~ 0xFFFE
 85	 */
 86	return ((chid & 0xFF00) == 0xFF00);
 87}
 88
 89static inline bool smc_ism_is_emulated(struct smcd_dev *smcd)
 90{
 91	u16 chid = smcd->dibs->ops->get_fabric_id(smcd->dibs);
 92
 93	return __smc_ism_is_emulated(chid);
 94}
 95
 96static inline bool smc_ism_is_loopback(struct dibs_dev *dibs)
 97{
 98	return (dibs->ops->get_fabric_id(dibs) == DIBS_LOOPBACK_FABRIC);
 99}
100
101static inline void copy_to_smcdgid(struct smcd_gid *sgid, uuid_t *dibs_gid)
102{
103	__be64 temp;
104
105	memcpy(&temp, dibs_gid, sizeof(sgid->gid));
106	sgid->gid = ntohll(temp);
107	memcpy(&temp, (uint8_t *)dibs_gid + sizeof(sgid->gid),
108	       sizeof(sgid->gid_ext));
109	sgid->gid_ext = ntohll(temp);
110}
111
112static inline void copy_to_dibsgid(uuid_t *dibs_gid, struct smcd_gid *sgid)
113{
114	__be64 temp;
115
116	temp = htonll(sgid->gid);
117	memcpy(dibs_gid, &temp, sizeof(sgid->gid));
118	temp = htonll(sgid->gid_ext);
119	memcpy((uint8_t *)dibs_gid + sizeof(sgid->gid), &temp,
120	       sizeof(sgid->gid_ext));
121}
122
123#endif