1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Shared Memory Communications Direct over loopback-ism device. 4 * 5 * SMC-D loopback-ism device structure definitions. 6 * 7 * Copyright (c) 2024, Alibaba Inc. 8 * 9 * Author: Wen Gu <guwen@linux.alibaba.com> 10 * Tony Lu <tonylu@linux.alibaba.com> 11 * 12 */ 13 14 #ifndef _SMC_LOOPBACK_H 15 #define _SMC_LOOPBACK_H 16 17 #include <linux/device.h> 18 #include <net/smc.h> 19 20 #if IS_ENABLED(CONFIG_SMC_LO) 21 #define SMC_LO_MAX_DMBS 5000 22 #define SMC_LO_DMBS_HASH_BITS 12 23 #define SMC_LO_RESERVED_CHID 0xFFFF 24 25 struct smc_lo_dmb_node { 26 struct hlist_node list; 27 u64 token; 28 u32 len; 29 u32 sba_idx; 30 void *cpu_addr; 31 dma_addr_t dma_addr; 32 refcount_t refcnt; 33 }; 34 35 struct smc_lo_dev { 36 struct smcd_dev *smcd; 37 struct device dev; 38 u16 chid; 39 struct smcd_gid local_gid; 40 atomic_t dmb_cnt; 41 rwlock_t dmb_ht_lock; 42 DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS); 43 DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS); 44 wait_queue_head_t ldev_release; 45 }; 46 47 int smc_loopback_init(void); 48 void smc_loopback_exit(void); 49 #else smc_loopback_init(void)50static inline int smc_loopback_init(void) 51 { 52 return 0; 53 } 54 smc_loopback_exit(void)55static inline void smc_loopback_exit(void) 56 { 57 } 58 #endif 59 60 #endif /* _SMC_LOOPBACK_H */ 61