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(lnk: &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 | |