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
 23enum smc_llc_reqresp {
 24	SMC_LLC_REQ,
 25	SMC_LLC_RESP
 26};
 27
 28enum smc_llc_msg_type {
 29	SMC_LLC_CONFIRM_LINK		= 0x01,
 30	SMC_LLC_ADD_LINK		= 0x02,
 31	SMC_LLC_ADD_LINK_CONT		= 0x03,
 32	SMC_LLC_DELETE_LINK		= 0x04,
 33	SMC_LLC_CONFIRM_RKEY		= 0x06,
 34	SMC_LLC_TEST_LINK		= 0x07,
 35	SMC_LLC_CONFIRM_RKEY_CONT	= 0x08,
 36	SMC_LLC_DELETE_RKEY		= 0x09,
 37};
 38
 39#define smc_link_downing(state) \
 40	(cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
 41
 42/* LLC DELETE LINK Request Reason Codes */
 43#define SMC_LLC_DEL_LOST_PATH		0x00010000
 44#define SMC_LLC_DEL_OP_INIT_TERM	0x00020000
 45#define SMC_LLC_DEL_PROG_INIT_TERM	0x00030000
 46#define SMC_LLC_DEL_PROT_VIOL		0x00040000
 47#define SMC_LLC_DEL_NO_ASYM_NEEDED	0x00050000
 48/* LLC DELETE LINK Response Reason Codes */
 49#define SMC_LLC_DEL_NOLNK	0x00100000  /* Unknown Link ID (no link) */
 50#define SMC_LLC_DEL_NOLGR	0x00200000  /* Unknown Link Group */
 51
 52/* returns a usable link of the link group, or NULL */
 53static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
 54{
 55	int i;
 56
 57	for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
 58		if (smc_link_usable(&lgr->lnk[i]))
 59			return &lgr->lnk[i];
 60	return NULL;
 61}
 62
 63/* set the termination reason code for the link group */
 64static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
 65					       u32 rsn)
 66{
 67	if (!lgr->llc_termination_rsn)
 68		lgr->llc_termination_rsn = rsn;
 69}
 70
 71/* transmit */
 72int smc_llc_send_confirm_link(struct smc_link *lnk,
 73			      enum smc_llc_reqresp reqresp);
 74int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
 75			  struct smc_link *link_new,
 76			  enum smc_llc_reqresp reqresp);
 77int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
 78			     enum smc_llc_reqresp reqresp, bool orderly,
 79			     u32 reason);
 80void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
 81void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
 82void smc_llc_lgr_clear(struct smc_link_group *lgr);
 83int smc_llc_link_init(struct smc_link *link);
 84void smc_llc_link_active(struct smc_link *link);
 85void smc_llc_link_clear(struct smc_link *link, bool log);
 86int smc_llc_do_confirm_rkey(struct smc_link *send_link,
 87			    struct smc_buf_desc *rmb_desc);
 88int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
 89			   struct smc_buf_desc *rmb_desc);
 90int smc_llc_flow_initiate(struct smc_link_group *lgr,
 91			  enum smc_llc_flowtype type);
 92void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
 93int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
 94			   enum smc_llc_reqresp type);
 95void smc_llc_link_set_uid(struct smc_link *link);
 96void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
 97struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
 98				    struct smc_link *lnk,
 99				    int time_out, u8 exp_msg);
100struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
101void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
102void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
103				  u32 rsn);
104int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
105int smc_llc_srv_add_link(struct smc_link *link);
106void smc_llc_add_link_local(struct smc_link *link);
107int smc_llc_init(void) __init;
108
109#endif /* SMC_LLC_H */