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0cfdd8f9 UB |
1 | /* |
2 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
3 | * | |
4 | * Definitions for SMC Connections, Link Groups and Links | |
5 | * | |
6 | * Copyright IBM Corp. 2016 | |
7 | * | |
8 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
9 | */ | |
10 | ||
11 | #ifndef _SMC_CORE_H | |
12 | #define _SMC_CORE_H | |
13 | ||
f38ba179 | 14 | #include <linux/atomic.h> |
0cfdd8f9 UB |
15 | #include <rdma/ib_verbs.h> |
16 | ||
17 | #include "smc.h" | |
18 | #include "smc_ib.h" | |
19 | ||
cd6851f3 UB |
20 | #define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */ |
21 | ||
0cfdd8f9 UB |
22 | struct smc_lgr_list { /* list of link group definition */ |
23 | struct list_head list; | |
24 | spinlock_t lock; /* protects list of link groups */ | |
25 | }; | |
26 | ||
27 | extern struct smc_lgr_list smc_lgr_list; /* list of link groups */ | |
28 | ||
29 | enum smc_lgr_role { /* possible roles of a link group */ | |
30 | SMC_CLNT, /* client */ | |
31 | SMC_SERV /* server */ | |
32 | }; | |
33 | ||
f38ba179 UB |
34 | #define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ |
35 | ||
36 | struct smc_wr_buf { | |
37 | u8 raw[SMC_WR_BUF_SIZE]; | |
38 | }; | |
39 | ||
0cfdd8f9 UB |
40 | struct smc_link { |
41 | struct smc_ib_device *smcibdev; /* ib-device */ | |
42 | u8 ibport; /* port - values 1 | 2 */ | |
f38ba179 UB |
43 | struct ib_pd *roce_pd; /* IB protection domain, |
44 | * unique for every RoCE QP | |
45 | */ | |
0cfdd8f9 UB |
46 | struct ib_qp *roce_qp; /* IB queue pair */ |
47 | struct ib_qp_attr qp_attr; /* IB queue pair attributes */ | |
f38ba179 UB |
48 | |
49 | struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ | |
50 | struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ | |
51 | struct ib_sge *wr_tx_sges; /* WR send gather meta data */ | |
52 | struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ | |
53 | /* above four vectors have wr_tx_cnt elements and use the same index */ | |
54 | dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ | |
55 | atomic_long_t wr_tx_id; /* seq # of last sent WR */ | |
56 | unsigned long *wr_tx_mask; /* bit mask of used indexes */ | |
57 | u32 wr_tx_cnt; /* number of WR send buffers */ | |
58 | wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ | |
59 | ||
60 | struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ | |
61 | struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ | |
62 | struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ | |
63 | /* above three vectors have wr_rx_cnt elements and use the same index */ | |
64 | dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ | |
65 | u64 wr_rx_id; /* seq # of last recv WR */ | |
66 | u32 wr_rx_cnt; /* number of WR recv buffers */ | |
67 | ||
0cfdd8f9 UB |
68 | union ib_gid gid; /* gid matching used vlan id */ |
69 | u32 peer_qpn; /* QP number of peer */ | |
70 | enum ib_mtu path_mtu; /* used mtu */ | |
71 | enum ib_mtu peer_mtu; /* mtu size of peer */ | |
72 | u32 psn_initial; /* QP tx initial packet seqno */ | |
73 | u32 peer_psn; /* QP rx initial packet seqno */ | |
74 | u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ | |
75 | u8 peer_gid[sizeof(union ib_gid)]; /* gid of peer*/ | |
76 | }; | |
77 | ||
78 | /* For now we just allow one parallel link per link group. The SMC protocol | |
79 | * allows more (up to 8). | |
80 | */ | |
81 | #define SMC_LINKS_PER_LGR_MAX 1 | |
82 | #define SMC_SINGLE_LINK 0 | |
83 | ||
84 | #define SMC_FIRST_CONTACT 1 /* first contact to a peer */ | |
85 | #define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/ | |
86 | ||
cd6851f3 UB |
87 | /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ |
88 | struct smc_buf_desc { | |
89 | struct list_head list; | |
90 | u64 dma_addr[SMC_LINKS_PER_LGR_MAX]; | |
91 | /* mapped address of buffer */ | |
92 | void *cpu_addr; /* virtual address of buffer */ | |
bd4ad577 UB |
93 | struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; |
94 | /* for rmb only: | |
95 | * rkey provided to peer | |
96 | */ | |
cd6851f3 UB |
97 | u32 used; /* currently used / unused */ |
98 | }; | |
99 | ||
bd4ad577 UB |
100 | struct smc_rtoken { /* address/key of remote RMB */ |
101 | u64 dma_addr; | |
102 | u32 rkey; | |
103 | }; | |
104 | ||
0cfdd8f9 UB |
105 | struct smc_link_group { |
106 | struct list_head list; | |
107 | enum smc_lgr_role role; /* client or server */ | |
108 | __be32 daddr; /* destination ip address */ | |
109 | struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; /* smc link */ | |
110 | char peer_systemid[SMC_SYSTEMID_LEN]; | |
111 | /* unique system_id of peer */ | |
112 | struct rb_root conns_all; /* connection tree */ | |
113 | rwlock_t conns_lock; /* protects conns_all */ | |
114 | unsigned int conns_num; /* current # of connections */ | |
115 | unsigned short vlan_id; /* vlan id of link group */ | |
cd6851f3 UB |
116 | |
117 | struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ | |
118 | rwlock_t sndbufs_lock; /* protects tx buffers */ | |
119 | struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ | |
120 | rwlock_t rmbs_lock; /* protects rx buffers */ | |
bd4ad577 UB |
121 | struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] |
122 | [SMC_LINKS_PER_LGR_MAX]; | |
123 | /* remote addr/key pairs */ | |
124 | unsigned long rtokens_used_mask[BITS_TO_LONGS( | |
125 | SMC_RMBS_PER_LGR_MAX)]; | |
126 | /* used rtoken elements */ | |
127 | ||
0cfdd8f9 UB |
128 | struct delayed_work free_work; /* delayed freeing of an lgr */ |
129 | bool sync_err; /* lgr no longer fits to peer */ | |
130 | }; | |
131 | ||
132 | /* Find the connection associated with the given alert token in the link group. | |
133 | * To use rbtrees we have to implement our own search core. | |
134 | * Requires @conns_lock | |
135 | * @token alert token to search for | |
136 | * @lgr link group to search in | |
137 | * Returns connection associated with token if found, NULL otherwise. | |
138 | */ | |
139 | static inline struct smc_connection *smc_lgr_find_conn( | |
140 | u32 token, struct smc_link_group *lgr) | |
141 | { | |
142 | struct smc_connection *res = NULL; | |
143 | struct rb_node *node; | |
144 | ||
145 | node = lgr->conns_all.rb_node; | |
146 | while (node) { | |
147 | struct smc_connection *cur = rb_entry(node, | |
148 | struct smc_connection, alert_node); | |
149 | ||
150 | if (cur->alert_token_local > token) { | |
151 | node = node->rb_left; | |
152 | } else { | |
153 | if (cur->alert_token_local < token) { | |
154 | node = node->rb_right; | |
155 | } else { | |
156 | res = cur; | |
157 | break; | |
158 | } | |
159 | } | |
160 | } | |
161 | ||
162 | return res; | |
163 | } | |
164 | ||
cd6851f3 UB |
165 | struct smc_sock; |
166 | struct smc_clc_msg_accept_confirm; | |
167 | ||
0cfdd8f9 UB |
168 | void smc_lgr_free(struct smc_link_group *lgr); |
169 | void smc_lgr_terminate(struct smc_link_group *lgr); | |
cd6851f3 UB |
170 | int smc_sndbuf_create(struct smc_sock *smc); |
171 | int smc_rmb_create(struct smc_sock *smc); | |
bd4ad577 UB |
172 | int smc_rmb_rtoken_handling(struct smc_connection *conn, |
173 | struct smc_clc_msg_accept_confirm *clc); | |
0cfdd8f9 UB |
174 | |
175 | #endif |