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https://github.com/torvalds/linux
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c3a910f238
This implements operations related to merging sndbuf with peer DMB in loopback-ism. The DMB won't be freed until no sndbuf is attached to it. Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com> Reviewed-and-tested-by: Jan Karcher <jaka@linux.ibm.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications Direct over loopback-ism device.
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*
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* SMC-D loopback-ism device structure definitions.
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*
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* Copyright (c) 2024, Alibaba Inc.
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*
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* Author: Wen Gu <guwen@linux.alibaba.com>
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* Tony Lu <tonylu@linux.alibaba.com>
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*
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*/
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#ifndef _SMC_LOOPBACK_H
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#define _SMC_LOOPBACK_H
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#include <linux/device.h>
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#include <linux/err.h>
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#include <net/smc.h>
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#if IS_ENABLED(CONFIG_SMC_LO)
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#define SMC_LO_MAX_DMBS 5000
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#define SMC_LO_DMBS_HASH_BITS 12
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#define SMC_LO_RESERVED_CHID 0xFFFF
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struct smc_lo_dmb_node {
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struct hlist_node list;
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u64 token;
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u32 len;
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u32 sba_idx;
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void *cpu_addr;
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dma_addr_t dma_addr;
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refcount_t refcnt;
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};
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struct smc_lo_dev {
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struct smcd_dev *smcd;
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struct device dev;
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u16 chid;
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struct smcd_gid local_gid;
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atomic_t dmb_cnt;
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rwlock_t dmb_ht_lock;
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DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
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DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
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wait_queue_head_t ldev_release;
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};
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int smc_loopback_init(void);
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void smc_loopback_exit(void);
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#else
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static inline int smc_loopback_init(void)
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{
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return 0;
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}
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static inline void smc_loopback_exit(void)
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{
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}
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#endif
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#endif /* _SMC_LOOPBACK_H */
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