net/smc/smc_llc.h

   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 */