1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Definitions for the SMC module (socket related) 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 #ifndef _SMC_H 12 #define _SMC_H 13 14 #include <linux/device.h> 15 #include <linux/spinlock.h> 16 #include <linux/types.h> 17 #include <linux/wait.h> 18 #include <linux/dibs.h> 19 #include "linux/ism.h" 20 21 struct sock; 22 23 #define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */ 24 25 struct smc_hashinfo { 26 rwlock_t lock; 27 struct hlist_head ht; 28 }; 29 30 /* SMCD/ISM device driver interface */ 31 struct smcd_dmb { 32 u64 dmb_tok; 33 u64 rgid; 34 u32 dmb_len; 35 u32 sba_idx; 36 u32 vlan_valid; 37 u32 vlan_id; 38 void *cpu_addr; 39 dma_addr_t dma_addr; 40 }; 41 42 #define ISM_EVENT_DMB 0 43 #define ISM_EVENT_GID 1 44 #define ISM_EVENT_SWR 2 45 46 #define ISM_RESERVED_VLANID 0x1FFF 47 48 struct smcd_dev; 49 50 struct smcd_gid { 51 u64 gid; 52 u64 gid_ext; 53 }; 54 55 struct smcd_ops { 56 int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb, 57 void *client); 58 int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb); 59 int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx, 60 bool sf, unsigned int offset, void *data, 61 unsigned int size); 62 63 /* optional operations */ 64 int (*signal_event)(struct smcd_dev *dev, struct smcd_gid *rgid, 65 u32 trigger_irq, u32 event_code, u64 info); 66 int (*support_dmb_nocopy)(struct smcd_dev *dev); 67 int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb); 68 int (*detach_dmb)(struct smcd_dev *dev, u64 token); 69 }; 70 71 struct smcd_dev { 72 const struct smcd_ops *ops; 73 void *priv; 74 void *client; 75 struct dibs_dev *dibs; 76 struct list_head list; 77 spinlock_t lock; 78 struct smc_connection **conn; 79 struct list_head vlan; 80 struct workqueue_struct *event_wq; 81 u8 pnetid[SMC_MAX_PNETID_LEN]; 82 bool pnetid_by_user; 83 struct list_head lgr_list; 84 spinlock_t lgr_lock; 85 atomic_t lgr_cnt; 86 wait_queue_head_t lgrs_deleted; 87 u8 going_away : 1; 88 }; 89 90 #endif /* _SMC_H */ 91