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 */ 121