LXR linux/net/smc/smc

   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 */
 110