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 23 enum smc_llc_reqresp { 24 SMC_LLC_REQ, 25 SMC_LLC_RESP 26 }; 27 28 enum 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 */ 53 static 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 */ 64 static 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 */ 72 int smc_llc_send_confirm_link(struct smc_link *lnk, 73 enum smc_llc_reqresp reqresp); 74 int 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); 77 int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id, 78 enum smc_llc_reqresp reqresp, bool orderly, 79 u32 reason); 80 void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id); 81 void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc); 82 void smc_llc_lgr_clear(struct smc_link_group *lgr); 83 int smc_llc_link_init(struct smc_link *link); 84 void smc_llc_link_active(struct smc_link *link); 85 void smc_llc_link_clear(struct smc_link *link, bool log); 86 int smc_llc_do_confirm_rkey(struct smc_link *send_link, 87 struct smc_buf_desc *rmb_desc); 88 int smc_llc_do_delete_rkey(struct smc_link_group *lgr, 89 struct smc_buf_desc *rmb_desc); 90 int smc_llc_flow_initiate(struct smc_link_group *lgr, 91 enum smc_llc_flowtype type); 92 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow); 93 int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry, 94 enum smc_llc_reqresp type); 95 void smc_llc_link_set_uid(struct smc_link *link); 96 void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry); 97 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr, 98 struct smc_link *lnk, 99 int time_out, u8 exp_msg); 100 struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow); 101 void smc_llc_flow_qentry_del(struct smc_llc_flow *flow); 102 void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord, 103 u32 rsn); 104 int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry); 105 int smc_llc_srv_add_link(struct smc_link *link); 106 void smc_llc_add_link_local(struct smc_link *link); 107 int smc_llc_init(void) __init; 108 109 #endif /* SMC_LLC_H */ 110