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_DELETE_LINK = 0x04, 32 SMC_LLC_CONFIRM_RKEY = 0x06, 33 SMC_LLC_TEST_LINK = 0x07, 34 SMC_LLC_CONFIRM_RKEY_CONT = 0x08, 35 SMC_LLC_DELETE_RKEY = 0x09, 36 }; 37 38 /* returns a usable link of the link group, or NULL */ 39 static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr) 40 { 41 int i; 42 43 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 44 if (smc_link_usable(&lgr->lnk[i])) 45 return &lgr->lnk[i]; 46 return NULL; 47 } 48 49 /* transmit */ 50 int smc_llc_send_confirm_link(struct smc_link *lnk, 51 enum smc_llc_reqresp reqresp); 52 int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[], 53 enum smc_llc_reqresp reqresp); 54 int smc_llc_send_delete_link(struct smc_link *link, 55 enum smc_llc_reqresp reqresp, bool orderly); 56 void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc); 57 void smc_llc_lgr_clear(struct smc_link_group *lgr); 58 int smc_llc_link_init(struct smc_link *link); 59 void smc_llc_link_active(struct smc_link *link); 60 void smc_llc_link_clear(struct smc_link *link); 61 int smc_llc_do_confirm_rkey(struct smc_link *send_link, 62 struct smc_buf_desc *rmb_desc); 63 int smc_llc_do_delete_rkey(struct smc_link_group *lgr, 64 struct smc_buf_desc *rmb_desc); 65 int smc_llc_flow_initiate(struct smc_link_group *lgr, 66 enum smc_llc_flowtype type); 67 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow); 68 int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry, 69 enum smc_llc_reqresp type); 70 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr, 71 struct smc_link *lnk, 72 int time_out, u8 exp_msg); 73 struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow); 74 void smc_llc_flow_qentry_del(struct smc_llc_flow *flow); 75 int smc_llc_init(void) __init; 76 77 #endif /* SMC_LLC_H */ 78