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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Shared Memory Communications Direct over loopback-ism device.
*
* SMC-D loopback-ism device structure definitions.
*
* Copyright (c) 2024, Alibaba Inc.
*
* Author: Wen Gu <guwen@linux.alibaba.com>
* Tony Lu <tonylu@linux.alibaba.com>
*
*/
#ifndef _SMC_LOOPBACK_H
#define _SMC_LOOPBACK_H
#include <linux/device.h>
#include <linux/err.h>
#include <net/smc.h>
#if IS_ENABLED(CONFIG_SMC_LO)
#define SMC_LO_MAX_DMBS 5000
#define SMC_LO_DMBS_HASH_BITS 12
#define SMC_LO_RESERVED_CHID 0xFFFF
struct smc_lo_dmb_node {
struct hlist_node list;
u64 token;
u32 len;
u32 sba_idx;
void *cpu_addr;
dma_addr_t dma_addr;
refcount_t refcnt;
};
struct smc_lo_dev {
struct smcd_dev *smcd;
struct device dev;
u16 chid;
struct smcd_gid local_gid;
atomic_t dmb_cnt;
rwlock_t dmb_ht_lock;
DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
wait_queue_head_t ldev_release;
};
int smc_loopback_init(void);
void smc_loopback_exit(void);
#else
static inline int smc_loopback_init(void)
{
return 0;
}
static inline void smc_loopback_exit(void)
{
}
#endif
#endif /* _SMC_LOOPBACK_H */
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