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_REQ_ADD_LINK = 0x05,
34 SMC_LLC_CONFIRM_RKEY = 0x06,
35 SMC_LLC_TEST_LINK = 0x07,
36 SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
37 SMC_LLC_DELETE_RKEY = 0x09,
38 /* V2 types */
39 SMC_LLC_CONFIRM_LINK_V2 = 0x21,
40 SMC_LLC_ADD_LINK_V2 = 0x22,
41 SMC_LLC_DELETE_LINK_V2 = 0x24,
42 SMC_LLC_REQ_ADD_LINK_V2 = 0x25,
43 SMC_LLC_CONFIRM_RKEY_V2 = 0x26,
44 SMC_LLC_TEST_LINK_V2 = 0x27,
45 SMC_LLC_DELETE_RKEY_V2 = 0x29,
46 };
47
48 #define smc_link_downing(state) \
49 (cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
50
51 /* LLC DELETE LINK Request Reason Codes */
52 #define SMC_LLC_DEL_LOST_PATH 0x00010000
53 #define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
54 #define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
55 #define SMC_LLC_DEL_PROT_VIOL 0x00040000
56 #define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
57 /* LLC DELETE LINK Response Reason Codes */
58 #define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
59 #define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
60
61 /* returns a usable link of the link group, or NULL */
smc_llc_usable_link(struct smc_link_group * lgr)62 static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
63 {
64 int i;
65
66 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
67 if (smc_link_usable(&lgr->lnk[i]))
68 return &lgr->lnk[i];
69 return NULL;
70 }
71
72 /* set the termination reason code for the link group */
smc_llc_set_termination_rsn(struct smc_link_group * lgr,u32 rsn)73 static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
74 u32 rsn)
75 {
76 if (!lgr->llc_termination_rsn)
77 lgr->llc_termination_rsn = rsn;
78 }
79
80 /* transmit */
81 int smc_llc_send_confirm_link(struct smc_link *lnk,
82 enum smc_llc_reqresp reqresp);
83 int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
84 struct smc_link *link_new,
85 enum smc_llc_reqresp reqresp);
86 int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
87 enum smc_llc_reqresp reqresp, bool orderly,
88 u32 reason);
89 void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
90 void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
91 void smc_llc_lgr_clear(struct smc_link_group *lgr);
92 int smc_llc_link_init(struct smc_link *link);
93 void smc_llc_link_active(struct smc_link *link);
94 void smc_llc_link_clear(struct smc_link *link, bool log);
95 int smc_llc_do_confirm_rkey(struct smc_link *send_link,
96 struct smc_buf_desc *rmb_desc);
97 int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
98 struct smc_buf_desc *rmb_desc);
99 int smc_llc_flow_initiate(struct smc_link_group *lgr,
100 enum smc_llc_flowtype type);
101 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
102 int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
103 enum smc_llc_reqresp type);
104 void smc_llc_link_set_uid(struct smc_link *link);
105 void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
106 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
107 struct smc_link *lnk,
108 int time_out, u8 exp_msg);
109 struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
110 void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
111 void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
112 u32 rsn);
113 int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
114 int smc_llc_srv_add_link(struct smc_link *link,
115 struct smc_llc_qentry *req_qentry);
116 void smc_llc_add_link_local(struct smc_link *link);
117 int smc_llc_init(void) __init;
118
119 #endif /* SMC_LLC_H */
120