[linux-2.6-block.git] / net / smc / smc_llc.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  Definitions for LLC (link layer control) message handling
 *
 *  Copyright IBM Corp. 2016
 *
 *  Author(s):  Klaus Wacker <Klaus.Wacker@de.ibm.com>
 *              Ursula Braun <ubraun@linux.vnet.ibm.com>
 */

#ifndef SMC_LLC_H
#define SMC_LLC_H

#include "smc_wr.h"

#define SMC_LLC_FLAG_RESP		0x80

#define SMC_LLC_WAIT_FIRST_TIME		(5 * HZ)
#define SMC_LLC_WAIT_TIME		(2 * HZ)
#define SMC_LLC_TESTLINK_DEFAULT_TIME	(30 * HZ)

enum smc_llc_reqresp {
	SMC_LLC_REQ,
	SMC_LLC_RESP
};

enum smc_llc_msg_type {
	SMC_LLC_CONFIRM_LINK		= 0x01,
	SMC_LLC_ADD_LINK		= 0x02,
	SMC_LLC_ADD_LINK_CONT		= 0x03,
	SMC_LLC_DELETE_LINK		= 0x04,
	SMC_LLC_REQ_ADD_LINK		= 0x05,
	SMC_LLC_CONFIRM_RKEY		= 0x06,
	SMC_LLC_TEST_LINK		= 0x07,
	SMC_LLC_CONFIRM_RKEY_CONT	= 0x08,
	SMC_LLC_DELETE_RKEY		= 0x09,
	/* V2 types */
	SMC_LLC_CONFIRM_LINK_V2		= 0x21,
	SMC_LLC_ADD_LINK_V2		= 0x22,
	SMC_LLC_DELETE_LINK_V2		= 0x24,
	SMC_LLC_REQ_ADD_LINK_V2		= 0x25,
	SMC_LLC_CONFIRM_RKEY_V2		= 0x26,
	SMC_LLC_TEST_LINK_V2		= 0x27,
	SMC_LLC_DELETE_RKEY_V2		= 0x29,
};

#define smc_link_downing(state) \
	(cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)

/* LLC DELETE LINK Request Reason Codes */
#define SMC_LLC_DEL_LOST_PATH		0x00010000
#define SMC_LLC_DEL_OP_INIT_TERM	0x00020000
#define SMC_LLC_DEL_PROG_INIT_TERM	0x00030000
#define SMC_LLC_DEL_PROT_VIOL		0x00040000
#define SMC_LLC_DEL_NO_ASYM_NEEDED	0x00050000
/* LLC DELETE LINK Response Reason Codes */
#define SMC_LLC_DEL_NOLNK	0x00100000  /* Unknown Link ID (no link) */
#define SMC_LLC_DEL_NOLGR	0x00200000  /* Unknown Link Group */

/* returns a usable link of the link group, or NULL */
static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
{
	int i;

	for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
		if (smc_link_usable(&lgr->lnk[i]))
			return &lgr->lnk[i];
	return NULL;
}

/* set the termination reason code for the link group */
static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
					       u32 rsn)
{
	if (!lgr->llc_termination_rsn)
		lgr->llc_termination_rsn = rsn;
}

/* transmit */
int smc_llc_send_confirm_link(struct smc_link *lnk,
			      enum smc_llc_reqresp reqresp);
int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
			  struct smc_link *link_new,
			  enum smc_llc_reqresp reqresp);
int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
			     enum smc_llc_reqresp reqresp, bool orderly,
			     u32 reason);
void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
void smc_llc_lgr_clear(struct smc_link_group *lgr);
int smc_llc_link_init(struct smc_link *link);
void smc_llc_link_active(struct smc_link *link);
void smc_llc_link_clear(struct smc_link *link, bool log);
int smc_llc_do_confirm_rkey(struct smc_link *send_link,
			    struct smc_buf_desc *rmb_desc);
int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
			   struct smc_buf_desc *rmb_desc);
int smc_llc_flow_initiate(struct smc_link_group *lgr,
			  enum smc_llc_flowtype type);
void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
			   enum smc_llc_reqresp type);
void smc_llc_link_set_uid(struct smc_link *link);
void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
				    struct smc_link *lnk,
				    int time_out, u8 exp_msg);
struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
				  u32 rsn);
int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
int smc_llc_srv_add_link(struct smc_link *link,
			 struct smc_llc_qentry *req_qentry);
void smc_llc_add_link_local(struct smc_link *link);
int smc_llc_init(void) __init;

#endif /* SMC_LLC_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Shared Memory Communications over RDMA (SMC-R) and RoCE
	4	*
	5	* Definitions for LLC (link layer control) message handling
	6	*
	7	* Copyright IBM Corp. 2016
	8	*
	9	* Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
	10	* Ursula Braun <ubraun@linux.vnet.ibm.com>
	11	*/
	12
	13	#ifndef SMC_LLC_H
	14	#define SMC_LLC_H
	15
	16	#include "smc_wr.h"
	17
	18	#define SMC_LLC_FLAG_RESP 0x80
	19
	20	#define SMC_LLC_WAIT_FIRST_TIME (5 * HZ)
	21	#define SMC_LLC_WAIT_TIME (2 * HZ)
	22	#define SMC_LLC_TESTLINK_DEFAULT_TIME (30 * HZ)
	23
	24	enum smc_llc_reqresp {
	25	SMC_LLC_REQ,
	26	SMC_LLC_RESP
	27	};
	28
	29	enum smc_llc_msg_type {
	30	SMC_LLC_CONFIRM_LINK = 0x01,
	31	SMC_LLC_ADD_LINK = 0x02,
	32	SMC_LLC_ADD_LINK_CONT = 0x03,
	33	SMC_LLC_DELETE_LINK = 0x04,
	34	SMC_LLC_REQ_ADD_LINK = 0x05,
	35	SMC_LLC_CONFIRM_RKEY = 0x06,
	36	SMC_LLC_TEST_LINK = 0x07,
	37	SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
	38	SMC_LLC_DELETE_RKEY = 0x09,
	39	/* V2 types */
	40	SMC_LLC_CONFIRM_LINK_V2 = 0x21,
	41	SMC_LLC_ADD_LINK_V2 = 0x22,
	42	SMC_LLC_DELETE_LINK_V2 = 0x24,
	43	SMC_LLC_REQ_ADD_LINK_V2 = 0x25,
	44	SMC_LLC_CONFIRM_RKEY_V2 = 0x26,
	45	SMC_LLC_TEST_LINK_V2 = 0x27,
	46	SMC_LLC_DELETE_RKEY_V2 = 0x29,
	47	};
	48
	49	#define smc_link_downing(state) \
	50	(cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
	51
	52	/* LLC DELETE LINK Request Reason Codes */
	53	#define SMC_LLC_DEL_LOST_PATH 0x00010000
	54	#define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
	55	#define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
	56	#define SMC_LLC_DEL_PROT_VIOL 0x00040000
	57	#define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
	58	/* LLC DELETE LINK Response Reason Codes */
	59	#define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
	60	#define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
	61
	62	/* returns a usable link of the link group, or NULL */
	63	static inline struct smc_link smc_llc_usable_link(struct smc_link_group lgr)
	64	{
	65	int i;
	66
	67	for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
	68	if (smc_link_usable(&lgr->lnk[i]))
	69	return &lgr->lnk[i];
	70	return NULL;
	71	}
	72
	73	/* set the termination reason code for the link group */
	74	static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
	75	u32 rsn)
	76	{
	77	if (!lgr->llc_termination_rsn)
	78	lgr->llc_termination_rsn = rsn;
	79	}
	80
	81	/* transmit */
	82	int smc_llc_send_confirm_link(struct smc_link *lnk,
	83	enum smc_llc_reqresp reqresp);
	84	int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
	85	struct smc_link *link_new,
	86	enum smc_llc_reqresp reqresp);
	87	int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
	88	enum smc_llc_reqresp reqresp, bool orderly,
	89	u32 reason);
	90	void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
	91	void smc_llc_lgr_init(struct smc_link_group lgr, struct smc_sock smc);
	92	void smc_llc_lgr_clear(struct smc_link_group *lgr);
	93	int smc_llc_link_init(struct smc_link *link);
	94	void smc_llc_link_active(struct smc_link *link);
	95	void smc_llc_link_clear(struct smc_link *link, bool log);
	96	int smc_llc_do_confirm_rkey(struct smc_link *send_link,
	97	struct smc_buf_desc *rmb_desc);
	98	int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
	99	struct smc_buf_desc *rmb_desc);
	100	int smc_llc_flow_initiate(struct smc_link_group *lgr,
	101	enum smc_llc_flowtype type);
	102	void smc_llc_flow_stop(struct smc_link_group lgr, struct smc_llc_flow flow);
	103	int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
	104	enum smc_llc_reqresp type);
	105	void smc_llc_link_set_uid(struct smc_link *link);
	106	void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
	107	struct smc_llc_qentry smc_llc_wait(struct smc_link_group lgr,
	108	struct smc_link *lnk,
	109	int time_out, u8 exp_msg);
	110	struct smc_llc_qentry smc_llc_flow_qentry_clr(struct smc_llc_flow flow);
	111	void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
	112	void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
	113	u32 rsn);
	114	int smc_llc_cli_add_link(struct smc_link link, struct smc_llc_qentry qentry);
	115	int smc_llc_srv_add_link(struct smc_link *link,
	116	struct smc_llc_qentry *req_qentry);
	117	void smc_llc_add_link_local(struct smc_link *link);
	118	int smc_llc_init(void) __init;
	119
	120	#endif /* SMC_LLC_H */