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/* 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)
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_DELETE_LINK = 0x04,
SMC_LLC_CONFIRM_RKEY = 0x06,
SMC_LLC_TEST_LINK = 0x07,
SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
SMC_LLC_DELETE_RKEY = 0x09,
};
#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;
}
/* 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_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);
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);
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);
int smc_llc_init(void) __init;
#endif /* SMC_LLC_H */
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