mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
4398888268
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 |
+--------+ +--------+
| |
| +----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>
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Shared Memory Communications over RDMA (SMC-R) and RoCE
|
|
*
|
|
* Definitions for the SMC module (socket related)
|
|
*
|
|
* Copyright IBM Corp. 2016
|
|
*
|
|
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
|
|
*/
|
|
#ifndef _SMC_H
|
|
#define _SMC_H
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/types.h>
|
|
#include <linux/wait.h>
|
|
#include "linux/ism.h"
|
|
|
|
struct sock;
|
|
|
|
#define SMC_MAX_PNETID_LEN 16 /* Max. length of PNET id */
|
|
|
|
struct smc_hashinfo {
|
|
rwlock_t lock;
|
|
struct hlist_head ht;
|
|
};
|
|
|
|
/* SMCD/ISM device driver interface */
|
|
struct smcd_dmb {
|
|
u64 dmb_tok;
|
|
u64 rgid;
|
|
u32 dmb_len;
|
|
u32 sba_idx;
|
|
u32 vlan_valid;
|
|
u32 vlan_id;
|
|
void *cpu_addr;
|
|
dma_addr_t dma_addr;
|
|
};
|
|
|
|
#define ISM_EVENT_DMB 0
|
|
#define ISM_EVENT_GID 1
|
|
#define ISM_EVENT_SWR 2
|
|
|
|
#define ISM_RESERVED_VLANID 0x1FFF
|
|
|
|
#define ISM_ERROR 0xFFFF
|
|
|
|
struct smcd_dev;
|
|
|
|
struct smcd_gid {
|
|
u64 gid;
|
|
u64 gid_ext;
|
|
};
|
|
|
|
struct smcd_ops {
|
|
int (*query_remote_gid)(struct smcd_dev *dev, struct smcd_gid *rgid,
|
|
u32 vid_valid, u32 vid);
|
|
int (*register_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb,
|
|
void *client);
|
|
int (*unregister_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
|
|
int (*move_data)(struct smcd_dev *dev, u64 dmb_tok, unsigned int idx,
|
|
bool sf, unsigned int offset, void *data,
|
|
unsigned int size);
|
|
int (*supports_v2)(void);
|
|
void (*get_local_gid)(struct smcd_dev *dev, struct smcd_gid *gid);
|
|
u16 (*get_chid)(struct smcd_dev *dev);
|
|
struct device* (*get_dev)(struct smcd_dev *dev);
|
|
|
|
/* optional operations */
|
|
int (*add_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
|
|
int (*del_vlan_id)(struct smcd_dev *dev, u64 vlan_id);
|
|
int (*set_vlan_required)(struct smcd_dev *dev);
|
|
int (*reset_vlan_required)(struct smcd_dev *dev);
|
|
int (*signal_event)(struct smcd_dev *dev, struct smcd_gid *rgid,
|
|
u32 trigger_irq, u32 event_code, u64 info);
|
|
int (*support_dmb_nocopy)(struct smcd_dev *dev);
|
|
int (*attach_dmb)(struct smcd_dev *dev, struct smcd_dmb *dmb);
|
|
int (*detach_dmb)(struct smcd_dev *dev, u64 token);
|
|
};
|
|
|
|
struct smcd_dev {
|
|
const struct smcd_ops *ops;
|
|
void *priv;
|
|
void *client;
|
|
struct list_head list;
|
|
spinlock_t lock;
|
|
struct smc_connection **conn;
|
|
struct list_head vlan;
|
|
struct workqueue_struct *event_wq;
|
|
u8 pnetid[SMC_MAX_PNETID_LEN];
|
|
bool pnetid_by_user;
|
|
struct list_head lgr_list;
|
|
spinlock_t lgr_lock;
|
|
atomic_t lgr_cnt;
|
|
wait_queue_head_t lgrs_deleted;
|
|
u8 going_away : 1;
|
|
};
|
|
|
|
#endif /* _SMC_H */
|