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b3bf76024f
The System EID (SEID) is an internal EID that is used by the SMCv2 software stack that has a predefined and constant value representing the s390 physical machine that the OS is executing on. So it should be managed by SMC stack instead of ISM driver and be consistent for all ISMv2 device (including virtual ISM devices) on s390 architecture. Suggested-by: Alexandra Winter <wintera@linux.ibm.com> Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Reviewed-and-tested-by: Wenjia Zhang <wenjia@linux.ibm.com> Reviewed-by: Alexandra Winter <wintera@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Shared Memory Communications Direct over ISM devices (SMC-D)
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*
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* SMC-D ISM device structure definitions.
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*
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* Copyright IBM Corp. 2018
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*/
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#ifndef SMCD_ISM_H
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#define SMCD_ISM_H
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#include <linux/uio.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include "smc.h"
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#define SMC_VIRTUAL_ISM_CHID_MASK 0xFF00
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#define SMC_ISM_IDENT_MASK 0x00FFFF
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struct smcd_dev_list { /* List of SMCD devices */
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struct list_head list;
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struct mutex mutex; /* Protects list of devices */
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};
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extern struct smcd_dev_list smcd_dev_list; /* list of smcd devices */
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struct smc_ism_vlanid { /* VLAN id set on ISM device */
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struct list_head list;
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unsigned short vlanid; /* Vlan id */
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refcount_t refcnt; /* Reference count */
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};
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struct smc_ism_seid {
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u8 seid_string[24];
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u8 serial_number[4];
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u8 type[4];
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};
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struct smcd_dev;
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int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
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struct smcd_dev *dev);
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void smc_ism_set_conn(struct smc_connection *conn);
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void smc_ism_unset_conn(struct smc_connection *conn);
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int smc_ism_get_vlan(struct smcd_dev *dev, unsigned short vlan_id);
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int smc_ism_put_vlan(struct smcd_dev *dev, unsigned short vlan_id);
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int smc_ism_register_dmb(struct smc_link_group *lgr, int buf_size,
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struct smc_buf_desc *dmb_desc);
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int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
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int smc_ism_signal_shutdown(struct smc_link_group *lgr);
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void smc_ism_get_system_eid(u8 **eid);
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u16 smc_ism_get_chid(struct smcd_dev *dev);
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bool smc_ism_is_v2_capable(void);
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int smc_ism_init(void);
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void smc_ism_exit(void);
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int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
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static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
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unsigned int idx, bool sf, unsigned int offset,
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void *data, size_t len)
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{
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int rc;
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rc = smcd->ops->move_data(smcd, dmb_tok, idx, sf, offset, data, len);
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return rc < 0 ? rc : 0;
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}
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static inline bool __smc_ism_is_virtual(u16 chid)
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{
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/* CHIDs in range of 0xFF00 to 0xFFFF are reserved
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* for virtual ISM device.
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*
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* loopback-ism: 0xFFFF
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* virtio-ism: 0xFF00 ~ 0xFFFE
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*/
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return ((chid & 0xFF00) == 0xFF00);
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}
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static inline bool smc_ism_is_virtual(struct smcd_dev *smcd)
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{
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u16 chid = smcd->ops->get_chid(smcd);
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return __smc_ism_is_virtual(chid);
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}
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#endif
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