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