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In some scenarios using Emulated-ISM device, sndbuf can share the same
physical memory region with peer DMB to avoid data copy from one side
to the other. In such case the sndbuf is only a descriptor that
describes the shared memory and does not actually occupy memory, it's
more like a ghost buffer.
+----------+ +----------+
| socket A | | socket B |
+----------+ +----------+
| |
+--------+ +--------+
| sndbuf | | DMB |
| desc | | desc |
+--------+ +--------+
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| +----v-----+
+--------------------------> memory |
+----------+
So here introduces three new SMC-D device operations to check if this
feature is supported by device, and to {attach|detach} ghost sndbuf to
peer DMB. For now only loopback-ism supports this.
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>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Definitions for the SMC module (socket related)
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef _SMC_H
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#define _SMC_H
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include "linux/ism.h"
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struct sock;
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#define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */
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struct smc_hashinfo {
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rwlock_t lock;
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struct hlist_head ht;
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};
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/* SMCD/ISM device driver interface */
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struct smcd_dmb {
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u64 dmb_tok;
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u64 rgid;
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u32 dmb_len;
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u32 sba_idx;
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u32 vlan_valid;
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u32 vlan_id;
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void *cpu_addr;
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dma_addr_t dma_addr;
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};
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#define ISM_EVENT_DMB 0
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#define ISM_EVENT_GID 1
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#define ISM_EVENT_SWR 2
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#define ISM_RESERVED_VLANID 0x1FFF
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#define ISM_ERROR 0xFFFF
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struct smcd_dev;
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struct smcd_gid {
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u64 gid;
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u64 gid_ext;
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};
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struct smcd_ops {
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int (*query_remote_gid)(struct smcd_dev *dev, struct smcd_gid *rgid,
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u32 vid_valid, u32 vid);
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int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb,
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void *client);
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int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
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int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
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bool sf, unsigned int offset, void *data,
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unsigned int size);
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int (*supports_v2)(void);
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void (*get_local_gid)(struct smcd_dev *dev, struct smcd_gid *gid);
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u16 (*get_chid)(struct smcd_dev *dev);
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struct device* (*get_dev)(struct smcd_dev *dev);
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/* optional operations */
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int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
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int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
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int (*set_vlan_required)(struct smcd_dev *dev);
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int (*reset_vlan_required)(struct smcd_dev *dev);
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int (*signal_event)(struct smcd_dev *dev, struct smcd_gid *rgid,
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u32 trigger_irq, u32 event_code, u64 info);
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int (*support_dmb_nocopy)(struct smcd_dev *dev);
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int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
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int (*detach_dmb)(struct smcd_dev *dev, u64 token);
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};
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struct smcd_dev {
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const struct smcd_ops *ops;
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void *priv;
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void *client;
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struct list_head list;
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spinlock_t lock;
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struct smc_connection **conn;
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struct list_head vlan;
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struct workqueue_struct *event_wq;
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u8 pnetid[SMC_MAX_PNETID_LEN];
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bool pnetid_by_user;
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struct list_head lgr_list;
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spinlock_t lgr_lock;
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atomic_t lgr_cnt;
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wait_queue_head_t lgrs_deleted;
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u8 going_away : 1;
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};
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#endif /* _SMC_H */
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