aboutsummaryrefslogtreecommitdiffstats
path: root/net/smc/smc_core.h
diff options
context:
space:
mode:
Diffstat (limited to 'net/smc/smc_core.h')
-rw-r--r--net/smc/smc_core.h425
1 files changed, 425 insertions, 0 deletions
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
new file mode 100644
index 000000000..9364d0f35
--- /dev/null
+++ b/net/smc/smc_core.h
@@ -0,0 +1,425 @@
1/* SPDX-License-Identifier: GPL-2.0 */
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
15#include <linux/atomic.h>
16#include <rdma/ib_verbs.h>
17
18#include "smc.h"
19#include "smc_ib.h"
20
21#define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */
22
23struct smc_lgr_list { /* list of link group definition */
24 struct list_head list;
25 spinlock_t lock; /* protects list of link groups */
26 u32 num; /* unique link group number */
27};
28
29enum smc_lgr_role { /* possible roles of a link group */
30 SMC_CLNT, /* client */
31 SMC_SERV /* server */
32};
33
34enum smc_link_state { /* possible states of a link */
35 SMC_LNK_UNUSED, /* link is unused */
36 SMC_LNK_INACTIVE, /* link is inactive */
37 SMC_LNK_ACTIVATING, /* link is being activated */
38 SMC_LNK_ACTIVE, /* link is active */
39};
40
41#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */
42
43struct smc_wr_buf {
44 u8 raw[SMC_WR_BUF_SIZE];
45};
46
47#define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */
48
49enum 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
55struct 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
63struct smc_rdma_sges { /* sges per message send */
64 struct smc_rdma_sge tx_rdma_sge[SMC_MAX_RDMA_WRITES];
65};
66
67struct smc_rdma_wr { /* work requests per message
68 * send
69 */
70 struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES];
71};
72
73#define SMC_LGR_ID_SIZE 4
74
75struct smc_link {
76 struct smc_ib_device *smcibdev; /* ib-device */
77 u8 ibport; /* port - values 1 | 2 */
78 struct ib_pd *roce_pd; /* IB protection domain,
79 * unique for every RoCE QP
80 */
81 struct ib_qp *roce_qp; /* IB queue pair */
82 struct ib_qp_attr qp_attr; /* IB queue pair attributes */
83
84 struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */
85 struct ib_send_wr *wr_tx_ibs; /* WR send meta data */
86 struct ib_sge *wr_tx_sges; /* WR send gather meta data */
87 struct smc_rdma_sges *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/
88 struct smc_rdma_wr *wr_tx_rdmas; /* WR RDMA WRITE */
89 struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */
90 struct completion *wr_tx_compl; /* WR send CQE completion */
91 /* above four vectors have wr_tx_cnt elements and use the same index */
92 dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */
93 atomic_long_t wr_tx_id; /* seq # of last sent WR */
94 unsigned long *wr_tx_mask; /* bit mask of used indexes */
95 u32 wr_tx_cnt; /* number of WR send buffers */
96 wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */
97 atomic_t wr_tx_refcnt; /* tx refs to link */
98
99 struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */
100 struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */
101 struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */
102 /* above three vectors have wr_rx_cnt elements and use the same index */
103 dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */
104 u64 wr_rx_id; /* seq # of last recv WR */
105 u32 wr_rx_cnt; /* number of WR recv buffers */
106 unsigned long wr_rx_tstamp; /* jiffies when last buf rx */
107
108 struct ib_reg_wr wr_reg; /* WR register memory region */
109 wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */
110 atomic_t wr_reg_refcnt; /* reg refs to link */
111 enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */
112
113 u8 gid[SMC_GID_SIZE];/* gid matching used vlan id*/
114 u8 sgid_index; /* gid index for vlan id */
115 u32 peer_qpn; /* QP number of peer */
116 enum ib_mtu path_mtu; /* used mtu */
117 enum ib_mtu peer_mtu; /* mtu size of peer */
118 u32 psn_initial; /* QP tx initial packet seqno */
119 u32 peer_psn; /* QP rx initial packet seqno */
120 u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
121 u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/
122 u8 link_id; /* unique # within link group */
123 u8 link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */
124 u8 peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */
125 u8 link_idx; /* index in lgr link array */
126 u8 link_is_asym; /* is link asymmetric? */
127 struct smc_link_group *lgr; /* parent link group */
128 struct work_struct link_down_wrk; /* wrk to bring link down */
129
130 enum smc_link_state state; /* state of link */
131 struct delayed_work llc_testlink_wrk; /* testlink worker */
132 struct completion llc_testlink_resp; /* wait for rx of testlink */
133 int llc_testlink_time; /* testlink interval */
134};
135
136/* For now we just allow one parallel link per link group. The SMC protocol
137 * allows more (up to 8).
138 */
139#define SMC_LINKS_PER_LGR_MAX 3
140#define SMC_SINGLE_LINK 0
141
142/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
143struct smc_buf_desc {
144 struct list_head list;
145 void *cpu_addr; /* virtual address of buffer */
146 struct page *pages;
147 int len; /* length of buffer */
148 u32 used; /* currently used / unused */
149 union {
150 struct { /* SMC-R */
151 struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];
152 /* virtual buffer */
153 struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX];
154 /* for rmb only: memory region
155 * incl. rkey provided to peer
156 */
157 u32 order; /* allocation order */
158
159 u8 is_conf_rkey;
160 /* confirm_rkey done */
161 u8 is_reg_mr[SMC_LINKS_PER_LGR_MAX];
162 /* mem region registered */
163 u8 is_map_ib[SMC_LINKS_PER_LGR_MAX];
164 /* mem region mapped to lnk */
165 u8 is_reg_err;
166 /* buffer registration err */
167 };
168 struct { /* SMC-D */
169 unsigned short sba_idx;
170 /* SBA index number */
171 u64 token;
172 /* DMB token number */
173 dma_addr_t dma_addr;
174 /* DMA address */
175 };
176 };
177};
178
179struct smc_rtoken { /* address/key of remote RMB */
180 u64 dma_addr;
181 u32 rkey;
182};
183
184#define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */
185#define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */
186/* theoretically, the RFC states that largest size would be 512K,
187 * i.e. compressed 5 and thus 6 sizes (0..5), despite
188 * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15)
189 */
190
191struct smcd_dev;
192
193enum smc_lgr_type { /* redundancy state of lgr */
194 SMC_LGR_NONE, /* no active links, lgr to be deleted */
195 SMC_LGR_SINGLE, /* 1 active RNIC on each peer */
196 SMC_LGR_SYMMETRIC, /* 2 active RNICs on each peer */
197 SMC_LGR_ASYMMETRIC_PEER, /* local has 2, peer 1 active RNICs */
198 SMC_LGR_ASYMMETRIC_LOCAL, /* local has 1, peer 2 active RNICs */
199};
200
201enum smc_llc_flowtype {
202 SMC_LLC_FLOW_NONE = 0,
203 SMC_LLC_FLOW_ADD_LINK = 2,
204 SMC_LLC_FLOW_DEL_LINK = 4,
205 SMC_LLC_FLOW_RKEY = 6,
206};
207
208struct smc_llc_qentry;
209
210struct smc_llc_flow {
211 enum smc_llc_flowtype type;
212 struct smc_llc_qentry *qentry;
213};
214
215struct smc_link_group {
216 struct list_head list;
217 struct rb_root conns_all; /* connection tree */
218 rwlock_t conns_lock; /* protects conns_all */
219 unsigned int conns_num; /* current # of connections */
220 unsigned short vlan_id; /* vlan id of link group */
221
222 struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */
223 struct mutex sndbufs_lock; /* protects tx buffers */
224 struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */
225 struct mutex rmbs_lock; /* protects rx buffers */
226
227 u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
228 struct delayed_work free_work; /* delayed freeing of an lgr */
229 struct work_struct terminate_work; /* abnormal lgr termination */
230 struct workqueue_struct *tx_wq; /* wq for conn. tx workers */
231 u8 sync_err : 1; /* lgr no longer fits to peer */
232 u8 terminating : 1;/* lgr is terminating */
233 u8 freeing : 1; /* lgr is being freed */
234
235 bool is_smcd; /* SMC-R or SMC-D */
236 u8 smc_version;
237 u8 negotiated_eid[SMC_MAX_EID_LEN];
238 u8 peer_os; /* peer operating system */
239 u8 peer_smc_release;
240 u8 peer_hostname[SMC_MAX_HOSTNAME_LEN];
241 union {
242 struct { /* SMC-R */
243 enum smc_lgr_role role;
244 /* client or server */
245 struct smc_link lnk[SMC_LINKS_PER_LGR_MAX];
246 /* smc link */
247 char peer_systemid[SMC_SYSTEMID_LEN];
248 /* unique system_id of peer */
249 struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX]
250 [SMC_LINKS_PER_LGR_MAX];
251 /* remote addr/key pairs */
252 DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
253 /* used rtoken elements */
254 u8 next_link_id;
255 enum smc_lgr_type type;
256 /* redundancy state */
257 u8 pnet_id[SMC_MAX_PNETID_LEN + 1];
258 /* pnet id of this lgr */
259 struct list_head llc_event_q;
260 /* queue for llc events */
261 spinlock_t llc_event_q_lock;
262 /* protects llc_event_q */
263 struct mutex llc_conf_mutex;
264 /* protects lgr reconfig. */
265 struct work_struct llc_add_link_work;
266 struct work_struct llc_del_link_work;
267 struct work_struct llc_event_work;
268 /* llc event worker */
269 wait_queue_head_t llc_flow_waiter;
270 /* w4 next llc event */
271 wait_queue_head_t llc_msg_waiter;
272 /* w4 next llc msg */
273 struct smc_llc_flow llc_flow_lcl;
274 /* llc local control field */
275 struct smc_llc_flow llc_flow_rmt;
276 /* llc remote control field */
277 struct smc_llc_qentry *delayed_event;
278 /* arrived when flow active */
279 spinlock_t llc_flow_lock;
280 /* protects llc flow */
281 int llc_testlink_time;
282 /* link keep alive time */
283 u32 llc_termination_rsn;
284 /* rsn code for termination */
285 };
286 struct { /* SMC-D */
287 u64 peer_gid;
288 /* Peer GID (remote) */
289 struct smcd_dev *smcd;
290 /* ISM device for VLAN reg. */
291 u8 peer_shutdown : 1;
292 /* peer triggered shutdownn */
293 };
294 };
295};
296
297struct smc_clc_msg_local;
298
299struct smc_init_info {
300 u8 is_smcd;
301 u8 smc_type_v1;
302 u8 smc_type_v2;
303 u8 first_contact_peer;
304 u8 first_contact_local;
305 unsigned short vlan_id;
306 /* SMC-R */
307 struct smc_clc_msg_local *ib_lcl;
308 struct smc_ib_device *ib_dev;
309 u8 ib_gid[SMC_GID_SIZE];
310 u8 ib_port;
311 u32 ib_clcqpn;
312 /* SMC-D */
313 u64 ism_peer_gid[SMC_MAX_ISM_DEVS + 1];
314 struct smcd_dev *ism_dev[SMC_MAX_ISM_DEVS + 1];
315 u16 ism_chid[SMC_MAX_ISM_DEVS + 1];
316 u8 ism_offered_cnt; /* # of ISM devices offered */
317 u8 ism_selected; /* index of selected ISM dev*/
318 u8 smcd_version;
319};
320
321/* Find the connection associated with the given alert token in the link group.
322 * To use rbtrees we have to implement our own search core.
323 * Requires @conns_lock
324 * @token alert token to search for
325 * @lgr link group to search in
326 * Returns connection associated with token if found, NULL otherwise.
327 */
328static inline struct smc_connection *smc_lgr_find_conn(
329 u32 token, struct smc_link_group *lgr)
330{
331 struct smc_connection *res = NULL;
332 struct rb_node *node;
333
334 node = lgr->conns_all.rb_node;
335 while (node) {
336 struct smc_connection *cur = rb_entry(node,
337 struct smc_connection, alert_node);
338
339 if (cur->alert_token_local > token) {
340 node = node->rb_left;
341 } else {
342 if (cur->alert_token_local < token) {
343 node = node->rb_right;
344 } else {
345 res = cur;
346 break;
347 }
348 }
349 }
350
351 return res;
352}
353
354/* returns true if the specified link is usable */
355static inline bool smc_link_usable(struct smc_link *lnk)
356{
357 if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
358 return false;
359 return true;
360}
361
362static inline bool smc_link_sendable(struct smc_link *lnk)
363{
364 return smc_link_usable(lnk) &&
365 lnk->qp_attr.cur_qp_state == IB_QPS_RTS;
366}
367
368static inline bool smc_link_active(struct smc_link *lnk)
369{
370 return lnk->state == SMC_LNK_ACTIVE;
371}
372
373struct smc_sock;
374struct smc_clc_msg_accept_confirm;
375struct smc_clc_msg_local;
376
377void smc_lgr_cleanup_early(struct smc_connection *conn);
378void smc_lgr_terminate_sched(struct smc_link_group *lgr);
379void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);
380void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport);
381void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid,
382 unsigned short vlan);
383void smc_smcd_terminate_all(struct smcd_dev *dev);
384void smc_smcr_terminate_all(struct smc_ib_device *smcibdev);
385int smc_buf_create(struct smc_sock *smc, bool is_smcd);
386int smc_uncompress_bufsize(u8 compressed);
387int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link,
388 struct smc_clc_msg_accept_confirm *clc);
389int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
390int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);
391void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
392 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey);
393void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
394 __be64 nw_vaddr, __be32 nw_rkey);
395void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn);
396void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
397void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);
398void smc_rmb_sync_sg_for_device(struct smc_connection *conn);
399int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini);
400
401void smc_conn_free(struct smc_connection *conn);
402int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini);
403void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr);
404int smc_core_init(void);
405void smc_core_exit(void);
406
407int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
408 u8 link_idx, struct smc_init_info *ini);
409void smcr_link_clear(struct smc_link *lnk, bool log);
410int smcr_buf_map_lgr(struct smc_link *lnk);
411int smcr_buf_reg_lgr(struct smc_link *lnk);
412void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type);
413void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
414 enum smc_lgr_type new_type, int asym_lnk_idx);
415int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc);
416struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
417 struct smc_link *from_lnk, bool is_dev_err);
418void smcr_link_down_cond(struct smc_link *lnk);
419void smcr_link_down_cond_sched(struct smc_link *lnk);
420
421static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
422{
423 return link->lgr;
424}
425#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-17 00:21:45 +0800