晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/linux/smc_diag.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _SMC_DIAG_H_
#define _SMC_DIAG_H_

#include <linux/types.h>
#include <linux/inet_diag.h>
#include <rdma/ib_user_verbs.h>

/* Request structure */
struct smc_diag_req {
	__u8	diag_family;
	__u8	pad[2];
	__u8	diag_ext;		/* Query extended information */
	struct inet_diag_sockid	id;
};

/* Base info structure. It contains socket identity (addrs/ports/cookie) based
 * on the internal clcsock, and more SMC-related socket data
 */
struct smc_diag_msg {
	__u8	diag_family;
	__u8	diag_state;
	__u8	diag_mode;
	__u8	diag_shutdown;
	struct inet_diag_sockid id;

	__u32	diag_uid;
	__u64	diag_inode;
};

/* Mode of a connection */
enum {
	SMC_DIAG_MODE_SMCR,
	SMC_DIAG_MODE_FALLBACK_TCP,
	SMC_DIAG_MODE_SMCD,
};

/* Extensions */

enum {
	SMC_DIAG_NONE,
	SMC_DIAG_CONNINFO,
	SMC_DIAG_LGRINFO,
	SMC_DIAG_SHUTDOWN,
	SMC_DIAG_DMBINFO,
	SMC_DIAG_FALLBACK,
	__SMC_DIAG_MAX,
};

#define SMC_DIAG_MAX (__SMC_DIAG_MAX - 1)

/* SMC_DIAG_CONNINFO */

struct smc_diag_cursor {
	__u16	reserved;
	__u16	wrap;
	__u32	count;
};

struct smc_diag_conninfo {
	__u32			token;		/* unique connection id */
	__u32			sndbuf_size;	/* size of send buffer */
	__u32			rmbe_size;	/* size of RMB element */
	__u32			peer_rmbe_size;	/* size of peer RMB element */
	/* local RMB element cursors */
	struct smc_diag_cursor	rx_prod;	/* received producer cursor */
	struct smc_diag_cursor	rx_cons;	/* received consumer cursor */
	/* peer RMB element cursors */
	struct smc_diag_cursor	tx_prod;	/* sent producer cursor */
	struct smc_diag_cursor	tx_cons;	/* sent consumer cursor */
	__u8			rx_prod_flags;	/* received producer flags */
	__u8			rx_conn_state_flags; /* recvd connection flags*/
	__u8			tx_prod_flags;	/* sent producer flags */
	__u8			tx_conn_state_flags; /* sent connection flags*/
	/* send buffer cursors */
	struct smc_diag_cursor	tx_prep;	/* prepared to be sent cursor */
	struct smc_diag_cursor	tx_sent;	/* sent cursor */
	struct smc_diag_cursor	tx_fin;		/* confirmed sent cursor */
};

/* SMC_DIAG_LINKINFO */

struct smc_diag_linkinfo {
	__u8 link_id;			/* link identifier */
	__u8 ibname[IB_DEVICE_NAME_MAX]; /* name of the RDMA device */
	__u8 ibport;			/* RDMA device port number */
	__u8 gid[40];			/* local GID */
	__u8 peer_gid[40];		/* peer GID */
};

struct smc_diag_lgrinfo {
	struct smc_diag_linkinfo	lnk[1];
	__u8				role;
};

struct smc_diag_fallback {
	__u32 reason;
	__u32 peer_diagnosis;
};

struct smcd_diag_dmbinfo {		/* SMC-D Socket internals */
	__u32 linkid;			/* Link identifier */
	__u64 peer_gid;			/* Peer GID */
	__u64 my_gid;			/* My GID */
	__u64 token;			/* Token of DMB */
	__u64 peer_token;		/* Token of remote DMBE */
};

#endif /* _SMC_DIAG_H_ */

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