]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
0cfdd8f9 UB |
2 | /* |
3 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
4 | * | |
5 | * Definitions for SMC Connections, Link Groups and Links | |
6 | * | |
7 | * Copyright IBM Corp. 2016 | |
8 | * | |
9 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
10 | */ | |
11 | ||
12 | #ifndef _SMC_CORE_H | |
13 | #define _SMC_CORE_H | |
14 | ||
f38ba179 | 15 | #include <linux/atomic.h> |
0cfdd8f9 UB |
16 | #include <rdma/ib_verbs.h> |
17 | ||
18 | #include "smc.h" | |
19 | #include "smc_ib.h" | |
20 | ||
cd6851f3 UB |
21 | #define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */ |
22 | ||
0cfdd8f9 UB |
23 | struct smc_lgr_list { /* list of link group definition */ |
24 | struct list_head list; | |
25 | spinlock_t lock; /* protects list of link groups */ | |
9fda3510 | 26 | u32 num; /* unique link group number */ |
0cfdd8f9 UB |
27 | }; |
28 | ||
0cfdd8f9 UB |
29 | enum smc_lgr_role { /* possible roles of a link group */ |
30 | SMC_CLNT, /* client */ | |
31 | SMC_SERV /* server */ | |
32 | }; | |
33 | ||
52bedf37 KG |
34 | enum smc_link_state { /* possible states of a link */ |
35 | SMC_LNK_INACTIVE, /* link is inactive */ | |
36 | SMC_LNK_ACTIVATING, /* link is being activated */ | |
0d18a0cb KG |
37 | SMC_LNK_ACTIVE, /* link is active */ |
38 | SMC_LNK_DELETING, /* link is being deleted */ | |
52bedf37 KG |
39 | }; |
40 | ||
f38ba179 UB |
41 | #define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ |
42 | ||
43 | struct smc_wr_buf { | |
44 | u8 raw[SMC_WR_BUF_SIZE]; | |
45 | }; | |
46 | ||
652a1e41 UB |
47 | #define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */ |
48 | ||
49 | enum smc_wr_reg_state { | |
50 | POSTED, /* ib_wr_reg_mr request posted */ | |
51 | CONFIRMED, /* ib_wr_reg_mr response: successful */ | |
52 | FAILED /* ib_wr_reg_mr response: failure */ | |
53 | }; | |
54 | ||
ad6f317f UB |
55 | struct smc_rdma_sge { /* sges for RDMA writes */ |
56 | struct ib_sge wr_tx_rdma_sge[SMC_IB_MAX_SEND_SGE]; | |
57 | }; | |
58 | ||
59 | #define SMC_MAX_RDMA_WRITES 2 /* max. # of RDMA writes per | |
60 | * message send | |
61 | */ | |
62 | ||
63 | struct smc_rdma_sges { /* sges per message send */ | |
64 | struct smc_rdma_sge tx_rdma_sge[SMC_MAX_RDMA_WRITES]; | |
65 | }; | |
66 | ||
67 | struct smc_rdma_wr { /* work requests per message | |
68 | * send | |
69 | */ | |
70 | struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES]; | |
71 | }; | |
72 | ||
0cfdd8f9 UB |
73 | struct smc_link { |
74 | struct smc_ib_device *smcibdev; /* ib-device */ | |
75 | u8 ibport; /* port - values 1 | 2 */ | |
f38ba179 UB |
76 | struct ib_pd *roce_pd; /* IB protection domain, |
77 | * unique for every RoCE QP | |
78 | */ | |
0cfdd8f9 UB |
79 | struct ib_qp *roce_qp; /* IB queue pair */ |
80 | struct ib_qp_attr qp_attr; /* IB queue pair attributes */ | |
f38ba179 UB |
81 | |
82 | struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ | |
83 | struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ | |
84 | struct ib_sge *wr_tx_sges; /* WR send gather meta data */ | |
ad6f317f UB |
85 | struct smc_rdma_sges *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/ |
86 | struct smc_rdma_wr *wr_tx_rdmas; /* WR RDMA WRITE */ | |
f38ba179 UB |
87 | struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ |
88 | /* above four vectors have wr_tx_cnt elements and use the same index */ | |
89 | dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ | |
90 | atomic_long_t wr_tx_id; /* seq # of last sent WR */ | |
91 | unsigned long *wr_tx_mask; /* bit mask of used indexes */ | |
92 | u32 wr_tx_cnt; /* number of WR send buffers */ | |
93 | wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ | |
94 | ||
95 | struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ | |
96 | struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ | |
97 | struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ | |
98 | /* above three vectors have wr_rx_cnt elements and use the same index */ | |
99 | dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ | |
100 | u64 wr_rx_id; /* seq # of last recv WR */ | |
101 | u32 wr_rx_cnt; /* number of WR recv buffers */ | |
877ae5be | 102 | unsigned long wr_rx_tstamp; /* jiffies when last buf rx */ |
f38ba179 | 103 | |
652a1e41 UB |
104 | struct ib_reg_wr wr_reg; /* WR register memory region */ |
105 | wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */ | |
106 | enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */ | |
107 | ||
7005ada6 UB |
108 | u8 gid[SMC_GID_SIZE];/* gid matching used vlan id*/ |
109 | u8 sgid_index; /* gid index for vlan id */ | |
0cfdd8f9 UB |
110 | u32 peer_qpn; /* QP number of peer */ |
111 | enum ib_mtu path_mtu; /* used mtu */ | |
112 | enum ib_mtu peer_mtu; /* mtu size of peer */ | |
113 | u32 psn_initial; /* QP tx initial packet seqno */ | |
114 | u32 peer_psn; /* QP rx initial packet seqno */ | |
115 | u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ | |
7005ada6 | 116 | u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/ |
9bf9abea | 117 | u8 link_id; /* unique # within link group */ |
52bedf37 KG |
118 | |
119 | enum smc_link_state state; /* state of link */ | |
2a4c57a9 | 120 | struct workqueue_struct *llc_wq; /* single thread work queue */ |
9bf9abea UB |
121 | struct completion llc_confirm; /* wait for rx of conf link */ |
122 | struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */ | |
75d320d6 KG |
123 | int llc_confirm_rc; /* rc from confirm link msg */ |
124 | int llc_confirm_resp_rc; /* rc from conf_resp msg */ | |
52bedf37 KG |
125 | struct completion llc_add; /* wait for rx of add link */ |
126 | struct completion llc_add_resp; /* wait for rx of add link rsp*/ | |
877ae5be KG |
127 | struct delayed_work llc_testlink_wrk; /* testlink worker */ |
128 | struct completion llc_testlink_resp; /* wait for rx of testlink */ | |
129 | int llc_testlink_time; /* testlink interval */ | |
44aa81ce KG |
130 | struct completion llc_confirm_rkey; /* wait 4 rx of cnf rkey */ |
131 | int llc_confirm_rkey_rc; /* rc from cnf rkey msg */ | |
60e03c62 KG |
132 | struct completion llc_delete_rkey; /* wait 4 rx of del rkey */ |
133 | int llc_delete_rkey_rc; /* rc from del rkey msg */ | |
134 | struct mutex llc_delete_rkey_mutex; /* serialize usage */ | |
0cfdd8f9 UB |
135 | }; |
136 | ||
137 | /* For now we just allow one parallel link per link group. The SMC protocol | |
138 | * allows more (up to 8). | |
139 | */ | |
140 | #define SMC_LINKS_PER_LGR_MAX 1 | |
141 | #define SMC_SINGLE_LINK 0 | |
142 | ||
143 | #define SMC_FIRST_CONTACT 1 /* first contact to a peer */ | |
144 | #define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/ | |
145 | ||
cd6851f3 UB |
146 | /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ |
147 | struct smc_buf_desc { | |
148 | struct list_head list; | |
cd6851f3 | 149 | void *cpu_addr; /* virtual address of buffer */ |
2ef4f27a | 150 | struct page *pages; |
69cb7dc0 | 151 | int len; /* length of buffer */ |
cd6851f3 | 152 | u32 used; /* currently used / unused */ |
c7674c00 | 153 | u8 wr_reg : 1; /* mem region registered */ |
a6920d1d | 154 | u8 regerr : 1; /* err during registration */ |
c6ba7c9b HW |
155 | union { |
156 | struct { /* SMC-R */ | |
157 | struct sg_table sgt[SMC_LINKS_PER_LGR_MAX]; | |
158 | /* virtual buffer */ | |
159 | struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; | |
160 | /* for rmb only: memory region | |
161 | * incl. rkey provided to peer | |
162 | */ | |
163 | u32 order; /* allocation order */ | |
164 | }; | |
165 | struct { /* SMC-D */ | |
166 | unsigned short sba_idx; | |
167 | /* SBA index number */ | |
168 | u64 token; | |
169 | /* DMB token number */ | |
170 | dma_addr_t dma_addr; | |
171 | /* DMA address */ | |
172 | }; | |
173 | }; | |
cd6851f3 UB |
174 | }; |
175 | ||
bd4ad577 UB |
176 | struct smc_rtoken { /* address/key of remote RMB */ |
177 | u64 dma_addr; | |
178 | u32 rkey; | |
179 | }; | |
180 | ||
9bf9abea | 181 | #define SMC_LGR_ID_SIZE 4 |
2f6becaf HW |
182 | #define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */ |
183 | #define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */ | |
184 | /* theoretically, the RFC states that largest size would be 512K, | |
185 | * i.e. compressed 5 and thus 6 sizes (0..5), despite | |
186 | * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15) | |
187 | */ | |
9bf9abea | 188 | |
c6ba7c9b HW |
189 | struct smcd_dev; |
190 | ||
0cfdd8f9 UB |
191 | struct smc_link_group { |
192 | struct list_head list; | |
0cfdd8f9 UB |
193 | struct rb_root conns_all; /* connection tree */ |
194 | rwlock_t conns_lock; /* protects conns_all */ | |
195 | unsigned int conns_num; /* current # of connections */ | |
196 | unsigned short vlan_id; /* vlan id of link group */ | |
cd6851f3 UB |
197 | |
198 | struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ | |
199 | rwlock_t sndbufs_lock; /* protects tx buffers */ | |
200 | struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ | |
201 | rwlock_t rmbs_lock; /* protects rx buffers */ | |
bd4ad577 | 202 | |
9bf9abea | 203 | u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ |
0cfdd8f9 | 204 | struct delayed_work free_work; /* delayed freeing of an lgr */ |
f528ba24 | 205 | struct work_struct terminate_work; /* abnormal lgr termination */ |
517c300e KG |
206 | u8 sync_err : 1; /* lgr no longer fits to peer */ |
207 | u8 terminating : 1;/* lgr is terminating */ | |
8e316b9e UB |
208 | u8 freefast : 1; /* free worker scheduled fast */ |
209 | u8 freeing : 1; /* lgr is being freed */ | |
c6ba7c9b HW |
210 | |
211 | bool is_smcd; /* SMC-R or SMC-D */ | |
212 | union { | |
213 | struct { /* SMC-R */ | |
214 | enum smc_lgr_role role; | |
215 | /* client or server */ | |
216 | struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; | |
217 | /* smc link */ | |
218 | char peer_systemid[SMC_SYSTEMID_LEN]; | |
219 | /* unique system_id of peer */ | |
220 | struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] | |
221 | [SMC_LINKS_PER_LGR_MAX]; | |
222 | /* remote addr/key pairs */ | |
144ce4b9 | 223 | DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX); |
c6ba7c9b HW |
224 | /* used rtoken elements */ |
225 | }; | |
226 | struct { /* SMC-D */ | |
227 | u64 peer_gid; | |
228 | /* Peer GID (remote) */ | |
229 | struct smcd_dev *smcd; | |
230 | /* ISM device for VLAN reg. */ | |
50c6b20e UB |
231 | u8 peer_shutdown : 1; |
232 | /* peer triggered shutdownn */ | |
c6ba7c9b HW |
233 | }; |
234 | }; | |
0cfdd8f9 UB |
235 | }; |
236 | ||
bc36d2fc KG |
237 | struct smc_clc_msg_local; |
238 | ||
239 | struct smc_init_info { | |
240 | u8 is_smcd; | |
241 | unsigned short vlan_id; | |
242 | int srv_first_contact; | |
7a62725a | 243 | int cln_first_contact; |
bc36d2fc KG |
244 | /* SMC-R */ |
245 | struct smc_clc_msg_local *ib_lcl; | |
246 | struct smc_ib_device *ib_dev; | |
247 | u8 ib_gid[SMC_GID_SIZE]; | |
248 | u8 ib_port; | |
249 | u32 ib_clcqpn; | |
250 | /* SMC-D */ | |
251 | u64 ism_gid; | |
252 | struct smcd_dev *ism_dev; | |
253 | }; | |
254 | ||
0cfdd8f9 UB |
255 | /* Find the connection associated with the given alert token in the link group. |
256 | * To use rbtrees we have to implement our own search core. | |
257 | * Requires @conns_lock | |
258 | * @token alert token to search for | |
259 | * @lgr link group to search in | |
260 | * Returns connection associated with token if found, NULL otherwise. | |
261 | */ | |
262 | static inline struct smc_connection *smc_lgr_find_conn( | |
263 | u32 token, struct smc_link_group *lgr) | |
264 | { | |
265 | struct smc_connection *res = NULL; | |
266 | struct rb_node *node; | |
267 | ||
268 | node = lgr->conns_all.rb_node; | |
269 | while (node) { | |
270 | struct smc_connection *cur = rb_entry(node, | |
271 | struct smc_connection, alert_node); | |
272 | ||
273 | if (cur->alert_token_local > token) { | |
274 | node = node->rb_left; | |
275 | } else { | |
276 | if (cur->alert_token_local < token) { | |
277 | node = node->rb_right; | |
278 | } else { | |
279 | res = cur; | |
280 | break; | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
285 | return res; | |
286 | } | |
287 | ||
f528ba24 UB |
288 | static inline void smc_lgr_terminate_sched(struct smc_link_group *lgr) |
289 | { | |
0b29ec64 | 290 | if (!lgr->terminating && !lgr->freeing) |
f528ba24 UB |
291 | schedule_work(&lgr->terminate_work); |
292 | } | |
293 | ||
cd6851f3 UB |
294 | struct smc_sock; |
295 | struct smc_clc_msg_accept_confirm; | |
2f6becaf | 296 | struct smc_clc_msg_local; |
cd6851f3 | 297 | |
9651b934 | 298 | void smc_lgr_forget(struct smc_link_group *lgr); |
51e3dfa8 | 299 | void smc_lgr_cleanup_early(struct smc_connection *conn); |
5421ec28 | 300 | void smc_lgr_terminate(struct smc_link_group *lgr, bool soft); |
9fda3510 | 301 | void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport); |
0512f69e HW |
302 | void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, |
303 | unsigned short vlan); | |
5421ec28 | 304 | void smc_smcd_terminate_all(struct smcd_dev *dev); |
0b29ec64 | 305 | void smc_smcr_terminate_all(struct smc_ib_device *smcibdev); |
c6ba7c9b | 306 | int smc_buf_create(struct smc_sock *smc, bool is_smcd); |
2f6becaf | 307 | int smc_uncompress_bufsize(u8 compressed); |
bd4ad577 UB |
308 | int smc_rmb_rtoken_handling(struct smc_connection *conn, |
309 | struct smc_clc_msg_accept_confirm *clc); | |
4ed75de5 KG |
310 | int smc_rtoken_add(struct smc_link_group *lgr, __be64 nw_vaddr, __be32 nw_rkey); |
311 | int smc_rtoken_delete(struct smc_link_group *lgr, __be32 nw_rkey); | |
10428dd8 UB |
312 | void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn); |
313 | void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn); | |
314 | void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn); | |
315 | void smc_rmb_sync_sg_for_device(struct smc_connection *conn); | |
bc36d2fc | 316 | int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini); |
c6ba7c9b | 317 | |
2f6becaf | 318 | void smc_conn_free(struct smc_connection *conn); |
bc36d2fc | 319 | int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini); |
0d18a0cb | 320 | void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr); |
6dabd405 | 321 | int smc_core_init(void); |
9fda3510 | 322 | void smc_core_exit(void); |
00e5fb26 SR |
323 | |
324 | static inline struct smc_link_group *smc_get_lgr(struct smc_link *link) | |
325 | { | |
326 | return container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]); | |
327 | } | |
0cfdd8f9 | 328 | #endif |