/* 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 LLC (link layer control) message handling
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
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* Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef SMC_LLC_H
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#define SMC_LLC_H
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#include "smc_wr.h"
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#define SMC_LLC_FLAG_RESP 0x80
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#define SMC_LLC_WAIT_FIRST_TIME (5 * HZ)
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#define SMC_LLC_WAIT_TIME (2 * HZ)
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enum smc_llc_reqresp {
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SMC_LLC_REQ,
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SMC_LLC_RESP
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};
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enum smc_llc_msg_type {
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SMC_LLC_CONFIRM_LINK = 0x01,
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SMC_LLC_ADD_LINK = 0x02,
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SMC_LLC_ADD_LINK_CONT = 0x03,
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SMC_LLC_DELETE_LINK = 0x04,
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SMC_LLC_CONFIRM_RKEY = 0x06,
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SMC_LLC_TEST_LINK = 0x07,
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SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
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SMC_LLC_DELETE_RKEY = 0x09,
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};
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#define smc_link_downing(state) \
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(cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
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/* LLC DELETE LINK Request Reason Codes */
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#define SMC_LLC_DEL_LOST_PATH 0x00010000
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#define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
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#define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
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#define SMC_LLC_DEL_PROT_VIOL 0x00040000
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#define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
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/* LLC DELETE LINK Response Reason Codes */
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#define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
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#define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
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/* returns a usable link of the link group, or NULL */
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static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
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{
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int i;
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
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if (smc_link_usable(&lgr->lnk[i]))
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return &lgr->lnk[i];
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return NULL;
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}
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/* set the termination reason code for the link group */
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static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
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u32 rsn)
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{
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if (!lgr->llc_termination_rsn)
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lgr->llc_termination_rsn = rsn;
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}
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/* transmit */
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int smc_llc_send_confirm_link(struct smc_link *lnk,
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enum smc_llc_reqresp reqresp);
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int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
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struct smc_link *link_new,
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enum smc_llc_reqresp reqresp);
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int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
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enum smc_llc_reqresp reqresp, bool orderly,
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u32 reason);
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void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
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void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
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void smc_llc_lgr_clear(struct smc_link_group *lgr);
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int smc_llc_link_init(struct smc_link *link);
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void smc_llc_link_active(struct smc_link *link);
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void smc_llc_link_clear(struct smc_link *link, bool log);
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int smc_llc_do_confirm_rkey(struct smc_link *send_link,
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struct smc_buf_desc *rmb_desc);
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int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
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struct smc_buf_desc *rmb_desc);
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int smc_llc_flow_initiate(struct smc_link_group *lgr,
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enum smc_llc_flowtype type);
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void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
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int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
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enum smc_llc_reqresp type);
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void smc_llc_link_set_uid(struct smc_link *link);
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void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
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struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
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struct smc_link *lnk,
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int time_out, u8 exp_msg);
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struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
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void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
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void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
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u32 rsn);
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int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
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int smc_llc_srv_add_link(struct smc_link *link);
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void smc_llc_add_link_local(struct smc_link *link);
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int smc_llc_init(void) __init;
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#endif /* SMC_LLC_H */
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