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 <linux/smc.h>
17#include <linux/pci.h>
18#include <rdma/ib_verbs.h>
19#include <net/genetlink.h>
20
21#include "smc.h"
22#include "smc_ib.h"
23
24#define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */
25#define SMC_CONN_PER_LGR_MIN 16 /* min. # of connections per link group */
26#define SMC_CONN_PER_LGR_MAX 255 /* max. # of connections per link group,
27 * also is the default value for SMC-R v1 and v2.0
28 */
29#define SMC_CONN_PER_LGR_PREFER 255 /* Preferred connections per link group used for
30 * SMC-R v2.1 and later negotiation, vendors or
31 * distrubutions may modify it to a value between
32 * 16-255 as needed.
33 */
34
35struct smc_lgr_list { /* list of link group definition */
36 struct list_head list;
37 spinlock_t lock; /* protects list of link groups */
38 u32 num; /* unique link group number */
39};
40
41enum smc_lgr_role { /* possible roles of a link group */
42 SMC_CLNT, /* client */
43 SMC_SERV /* server */
44};
45
46enum smc_link_state { /* possible states of a link */
47 SMC_LNK_UNUSED, /* link is unused */
48 SMC_LNK_INACTIVE, /* link is inactive */
49 SMC_LNK_ACTIVATING, /* link is being activated */
50 SMC_LNK_ACTIVE, /* link is active */
51};
52
53#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */
54#define SMC_WR_BUF_V2_SIZE 8192 /* size of v2 work request buffer */
55
56struct smc_wr_buf {
57 u8 raw[SMC_WR_BUF_SIZE];
58};
59
60struct smc_wr_v2_buf {
61 u8 raw[SMC_WR_BUF_V2_SIZE];
62};
63
64#define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */
65
66enum smc_wr_reg_state {
67 POSTED, /* ib_wr_reg_mr request posted */
68 CONFIRMED, /* ib_wr_reg_mr response: successful */
69 FAILED /* ib_wr_reg_mr response: failure */
70};
71
72struct smc_rdma_sge { /* sges for RDMA writes */
73 struct ib_sge wr_tx_rdma_sge[SMC_IB_MAX_SEND_SGE];
74};
75
76#define SMC_MAX_RDMA_WRITES 2 /* max. # of RDMA writes per
77 * message send
78 */
79
80struct smc_rdma_sges { /* sges per message send */
81 struct smc_rdma_sge tx_rdma_sge[SMC_MAX_RDMA_WRITES];
82};
83
84struct smc_rdma_wr { /* work requests per message
85 * send
86 */
87 struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES];
88};
89
90#define SMC_LGR_ID_SIZE 4
91
92struct smc_link {
93 struct smc_ib_device *smcibdev; /* ib-device */
94 u8 ibport; /* port - values 1 | 2 */
95 struct ib_pd *roce_pd; /* IB protection domain,
96 * unique for every RoCE QP
97 */
98 struct ib_qp *roce_qp; /* IB queue pair */
99 struct ib_qp_attr qp_attr; /* IB queue pair attributes */
100
101 struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */
102 struct ib_send_wr *wr_tx_ibs; /* WR send meta data */
103 struct ib_sge *wr_tx_sges; /* WR send gather meta data */
104 struct smc_rdma_sges *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/
105 struct smc_rdma_wr *wr_tx_rdmas; /* WR RDMA WRITE */
106 struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */
107 struct completion *wr_tx_compl; /* WR send CQE completion */
108 /* above four vectors have wr_tx_cnt elements and use the same index */
109 struct ib_send_wr *wr_tx_v2_ib; /* WR send v2 meta data */
110 struct ib_sge *wr_tx_v2_sge; /* WR send v2 gather meta data*/
111 struct smc_wr_tx_pend *wr_tx_v2_pend; /* WR send v2 waiting for CQE */
112 dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */
113 dma_addr_t wr_tx_v2_dma_addr; /* DMA address of v2 tx buf*/
114 atomic_long_t wr_tx_id; /* seq # of last sent WR */
115 unsigned long *wr_tx_mask; /* bit mask of used indexes */
116 u32 wr_tx_cnt; /* number of WR send buffers */
117 wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */
118 struct {
119 struct percpu_ref wr_tx_refs;
120 } ____cacheline_aligned_in_smp;
121 struct completion tx_ref_comp;
122
123 struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */
124 struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */
125 struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */
126 /* above three vectors have wr_rx_cnt elements and use the same index */
127 dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */
128 dma_addr_t wr_rx_v2_dma_addr; /* DMA address of v2 rx buf*/
129 u64 wr_rx_id; /* seq # of last recv WR */
130 u64 wr_rx_id_compl; /* seq # of last completed WR */
131 u32 wr_rx_cnt; /* number of WR recv buffers */
132 unsigned long wr_rx_tstamp; /* jiffies when last buf rx */
133 wait_queue_head_t wr_rx_empty_wait; /* wait for RQ empty */
134
135 struct ib_reg_wr wr_reg; /* WR register memory region */
136 wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */
137 struct {
138 struct percpu_ref wr_reg_refs;
139 } ____cacheline_aligned_in_smp;
140 struct completion reg_ref_comp;
141 enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */
142
143 u8 gid[SMC_GID_SIZE];/* gid matching used vlan id*/
144 u8 sgid_index; /* gid index for vlan id */
145 u32 peer_qpn; /* QP number of peer */
146 enum ib_mtu path_mtu; /* used mtu */
147 enum ib_mtu peer_mtu; /* mtu size of peer */
148 u32 psn_initial; /* QP tx initial packet seqno */
149 u32 peer_psn; /* QP rx initial packet seqno */
150 u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
151 u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/
152 u8 link_id; /* unique # within link group */
153 u8 link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */
154 u8 peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */
155 u8 link_idx; /* index in lgr link array */
156 u8 link_is_asym; /* is link asymmetric? */
157 u8 clearing : 1; /* link is being cleared */
158 refcount_t refcnt; /* link reference count */
159 struct smc_link_group *lgr; /* parent link group */
160 struct work_struct link_down_wrk; /* wrk to bring link down */
161 char ibname[IB_DEVICE_NAME_MAX]; /* ib device name */
162 int ndev_ifidx; /* network device ifindex */
163
164 enum smc_link_state state; /* state of link */
165 struct delayed_work llc_testlink_wrk; /* testlink worker */
166 struct completion llc_testlink_resp; /* wait for rx of testlink */
167 int llc_testlink_time; /* testlink interval */
168 atomic_t conn_cnt; /* connections on this link */
169};
170
171/* For now we just allow one parallel link per link group. The SMC protocol
172 * allows more (up to 8).
173 */
174#define SMC_LINKS_PER_LGR_MAX 3
175#define SMC_SINGLE_LINK 0
176#define SMC_LINKS_ADD_LNK_MIN 1 /* min. # of links per link group */
177#define SMC_LINKS_ADD_LNK_MAX 2 /* max. # of links per link group, also is the
178 * default value for smc-r v1.0 and v2.0
179 */
180#define SMC_LINKS_PER_LGR_MAX_PREFER 2 /* Preferred max links per link group used for
181 * SMC-R v2.1 and later negotiation, vendors or
182 * distrubutions may modify it to a value between
183 * 1-2 as needed.
184 */
185
186/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
187struct smc_buf_desc {
188 struct list_head list;
189 void *cpu_addr; /* virtual address of buffer */
190 struct page *pages;
191 int len; /* length of buffer */
192 u32 used; /* currently used / unused */
193 union {
194 struct { /* SMC-R */
195 struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];
196 /* virtual buffer */
197 struct ib_mr *mr[SMC_LINKS_PER_LGR_MAX];
198 /* memory region: for rmb and
199 * vzalloced sndbuf
200 * incl. rkey provided to peer
201 * and lkey provided to local
202 */
203 u32 order; /* allocation order */
204
205 u8 is_conf_rkey;
206 /* confirm_rkey done */
207 u8 is_reg_mr[SMC_LINKS_PER_LGR_MAX];
208 /* mem region registered */
209 u8 is_map_ib[SMC_LINKS_PER_LGR_MAX];
210 /* mem region mapped to lnk */
211 u8 is_dma_need_sync;
212 u8 is_reg_err;
213 /* buffer registration err */
214 u8 is_vm;
215 /* virtually contiguous */
216 };
217 struct { /* SMC-D */
218 unsigned short sba_idx;
219 /* SBA index number */
220 u64 token;
221 /* DMB token number */
222 dma_addr_t dma_addr;
223 /* DMA address */
224 };
225 };
226};
227
228struct smc_rtoken { /* address/key of remote RMB */
229 u64 dma_addr;
230 u32 rkey;
231};
232
233#define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */
234#define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */
235/* theoretically, the RFC states that largest size would be 512K,
236 * i.e. compressed 5 and thus 6 sizes (0..5), despite
237 * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15)
238 */
239
240struct smcd_dev;
241
242enum smc_lgr_type { /* redundancy state of lgr */
243 SMC_LGR_NONE, /* no active links, lgr to be deleted */
244 SMC_LGR_SINGLE, /* 1 active RNIC on each peer */
245 SMC_LGR_SYMMETRIC, /* 2 active RNICs on each peer */
246 SMC_LGR_ASYMMETRIC_PEER, /* local has 2, peer 1 active RNICs */
247 SMC_LGR_ASYMMETRIC_LOCAL, /* local has 1, peer 2 active RNICs */
248};
249
250enum smcr_buf_type { /* types of SMC-R sndbufs and RMBs */
251 SMCR_PHYS_CONT_BUFS = 0,
252 SMCR_VIRT_CONT_BUFS = 1,
253 SMCR_MIXED_BUFS = 2,
254};
255
256enum smc_llc_flowtype {
257 SMC_LLC_FLOW_NONE = 0,
258 SMC_LLC_FLOW_ADD_LINK = 2,
259 SMC_LLC_FLOW_DEL_LINK = 4,
260 SMC_LLC_FLOW_REQ_ADD_LINK = 5,
261 SMC_LLC_FLOW_RKEY = 6,
262};
263
264struct smc_llc_qentry;
265
266struct smc_llc_flow {
267 enum smc_llc_flowtype type;
268 struct smc_llc_qentry *qentry;
269};
270
271struct smc_link_group {
272 struct list_head list;
273 struct rb_root conns_all; /* connection tree */
274 rwlock_t conns_lock; /* protects conns_all */
275 unsigned int conns_num; /* current # of connections */
276 unsigned short vlan_id; /* vlan id of link group */
277
278 struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */
279 struct rw_semaphore sndbufs_lock; /* protects tx buffers */
280 struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */
281 struct rw_semaphore rmbs_lock; /* protects rx buffers */
282
283 u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
284 struct delayed_work free_work; /* delayed freeing of an lgr */
285 struct work_struct terminate_work; /* abnormal lgr termination */
286 struct workqueue_struct *tx_wq; /* wq for conn. tx workers */
287 u8 sync_err : 1; /* lgr no longer fits to peer */
288 u8 terminating : 1;/* lgr is terminating */
289 u8 freeing : 1; /* lgr is being freed */
290
291 refcount_t refcnt; /* lgr reference count */
292 bool is_smcd; /* SMC-R or SMC-D */
293 u8 smc_version;
294 u8 negotiated_eid[SMC_MAX_EID_LEN];
295 u8 peer_os; /* peer operating system */
296 u8 peer_smc_release;
297 u8 peer_hostname[SMC_MAX_HOSTNAME_LEN];
298 union {
299 struct { /* SMC-R */
300 enum smc_lgr_role role;
301 /* client or server */
302 struct smc_link lnk[SMC_LINKS_PER_LGR_MAX];
303 /* smc link */
304 struct smc_wr_v2_buf *wr_rx_buf_v2;
305 /* WR v2 recv payload buffer */
306 struct smc_wr_v2_buf *wr_tx_buf_v2;
307 /* WR v2 send payload buffer */
308 char peer_systemid[SMC_SYSTEMID_LEN];
309 /* unique system_id of peer */
310 struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX]
311 [SMC_LINKS_PER_LGR_MAX];
312 /* remote addr/key pairs */
313 DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
314 /* used rtoken elements */
315 u8 next_link_id;
316 enum smc_lgr_type type;
317 enum smcr_buf_type buf_type;
318 /* redundancy state */
319 u8 pnet_id[SMC_MAX_PNETID_LEN + 1];
320 /* pnet id of this lgr */
321 struct list_head llc_event_q;
322 /* queue for llc events */
323 spinlock_t llc_event_q_lock;
324 /* protects llc_event_q */
325 struct rw_semaphore llc_conf_mutex;
326 /* protects lgr reconfig. */
327 struct work_struct llc_add_link_work;
328 struct work_struct llc_del_link_work;
329 struct work_struct llc_event_work;
330 /* llc event worker */
331 wait_queue_head_t llc_flow_waiter;
332 /* w4 next llc event */
333 wait_queue_head_t llc_msg_waiter;
334 /* w4 next llc msg */
335 struct smc_llc_flow llc_flow_lcl;
336 /* llc local control field */
337 struct smc_llc_flow llc_flow_rmt;
338 /* llc remote control field */
339 struct smc_llc_qentry *delayed_event;
340 /* arrived when flow active */
341 spinlock_t llc_flow_lock;
342 /* protects llc flow */
343 int llc_testlink_time;
344 /* link keep alive time */
345 u32 llc_termination_rsn;
346 /* rsn code for termination */
347 u8 nexthop_mac[ETH_ALEN];
348 u8 uses_gateway;
349 __be32 saddr;
350 /* net namespace */
351 struct net *net;
352 u8 max_conns;
353 /* max conn can be assigned to lgr */
354 u8 max_links;
355 /* max links can be added in lgr */
356 };
357 struct { /* SMC-D */
358 u64 peer_gid;
359 /* Peer GID (remote) */
360 struct smcd_dev *smcd;
361 /* ISM device for VLAN reg. */
362 u8 peer_shutdown : 1;
363 /* peer triggered shutdownn */
364 };
365 };
366};
367
368struct smc_clc_msg_local;
369
370#define GID_LIST_SIZE 2
371
372struct smc_gidlist {
373 u8 len;
374 u8 list[GID_LIST_SIZE][SMC_GID_SIZE];
375};
376
377struct smc_init_info_smcrv2 {
378 /* Input fields */
379 __be32 saddr;
380 struct sock *clc_sk;
381 __be32 daddr;
382
383 /* Output fields when saddr is set */
384 struct smc_ib_device *ib_dev_v2;
385 u8 ib_port_v2;
386 u8 ib_gid_v2[SMC_GID_SIZE];
387
388 /* Additional output fields when clc_sk and daddr is set as well */
389 u8 uses_gateway;
390 u8 nexthop_mac[ETH_ALEN];
391
392 struct smc_gidlist gidlist;
393};
394
395struct smc_init_info {
396 u8 is_smcd;
397 u8 smc_type_v1;
398 u8 smc_type_v2;
399 u8 release_nr;
400 u8 max_conns;
401 u8 max_links;
402 u8 first_contact_peer;
403 u8 first_contact_local;
404 unsigned short vlan_id;
405 u32 rc;
406 u8 negotiated_eid[SMC_MAX_EID_LEN];
407 /* SMC-R */
408 u8 smcr_version;
409 u8 check_smcrv2;
410 u8 peer_gid[SMC_GID_SIZE];
411 u8 peer_mac[ETH_ALEN];
412 u8 peer_systemid[SMC_SYSTEMID_LEN];
413 struct smc_ib_device *ib_dev;
414 u8 ib_gid[SMC_GID_SIZE];
415 u8 ib_port;
416 u32 ib_clcqpn;
417 struct smc_init_info_smcrv2 smcrv2;
418 /* SMC-D */
419 u64 ism_peer_gid[SMC_MAX_ISM_DEVS + 1];
420 struct smcd_dev *ism_dev[SMC_MAX_ISM_DEVS + 1];
421 u16 ism_chid[SMC_MAX_ISM_DEVS + 1];
422 u8 ism_offered_cnt; /* # of ISM devices offered */
423 u8 ism_selected; /* index of selected ISM dev*/
424 u8 smcd_version;
425};
426
427/* Find the connection associated with the given alert token in the link group.
428 * To use rbtrees we have to implement our own search core.
429 * Requires @conns_lock
430 * @token alert token to search for
431 * @lgr link group to search in
432 * Returns connection associated with token if found, NULL otherwise.
433 */
434static inline struct smc_connection *smc_lgr_find_conn(
435 u32 token, struct smc_link_group *lgr)
436{
437 struct smc_connection *res = NULL;
438 struct rb_node *node;
439
440 node = lgr->conns_all.rb_node;
441 while (node) {
442 struct smc_connection *cur = rb_entry(node,
443 struct smc_connection, alert_node);
444
445 if (cur->alert_token_local > token) {
446 node = node->rb_left;
447 } else {
448 if (cur->alert_token_local < token) {
449 node = node->rb_right;
450 } else {
451 res = cur;
452 break;
453 }
454 }
455 }
456
457 return res;
458}
459
460static inline bool smc_conn_lgr_valid(struct smc_connection *conn)
461{
462 return conn->lgr && conn->alert_token_local;
463}
464
465/*
466 * Returns true if the specified link is usable.
467 *
468 * usable means the link is ready to receive RDMA messages, map memory
469 * on the link, etc. This doesn't ensure we are able to send RDMA messages
470 * on this link, if sending RDMA messages is needed, use smc_link_sendable()
471 */
472static inline bool smc_link_usable(struct smc_link *lnk)
473{
474 if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
475 return false;
476 return true;
477}
478
479/*
480 * Returns true if the specified link is ready to receive AND send RDMA
481 * messages.
482 *
483 * For the client side in first contact, the underlying QP may still in
484 * RESET or RTR when the link state is ACTIVATING, checks in smc_link_usable()
485 * is not strong enough. For those places that need to send any CDC or LLC
486 * messages, use smc_link_sendable(), otherwise, use smc_link_usable() instead
487 */
488static inline bool smc_link_sendable(struct smc_link *lnk)
489{
490 return smc_link_usable(lnk) &&
491 lnk->qp_attr.cur_qp_state == IB_QPS_RTS;
492}
493
494static inline bool smc_link_active(struct smc_link *lnk)
495{
496 return lnk->state == SMC_LNK_ACTIVE;
497}
498
499static inline void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
500{
501 sprintf(buf, fmt: "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
502 be16_to_cpu(((__be16 *)gid_raw)[0]),
503 be16_to_cpu(((__be16 *)gid_raw)[1]),
504 be16_to_cpu(((__be16 *)gid_raw)[2]),
505 be16_to_cpu(((__be16 *)gid_raw)[3]),
506 be16_to_cpu(((__be16 *)gid_raw)[4]),
507 be16_to_cpu(((__be16 *)gid_raw)[5]),
508 be16_to_cpu(((__be16 *)gid_raw)[6]),
509 be16_to_cpu(((__be16 *)gid_raw)[7]));
510}
511
512struct smc_pci_dev {
513 __u32 pci_fid;
514 __u16 pci_pchid;
515 __u16 pci_vendor;
516 __u16 pci_device;
517 __u8 pci_id[SMC_PCI_ID_STR_LEN];
518};
519
520static inline void smc_set_pci_values(struct pci_dev *pci_dev,
521 struct smc_pci_dev *smc_dev)
522{
523 smc_dev->pci_vendor = pci_dev->vendor;
524 smc_dev->pci_device = pci_dev->device;
525 snprintf(buf: smc_dev->pci_id, size: sizeof(smc_dev->pci_id), fmt: "%s",
526 pci_name(pdev: pci_dev));
527#if IS_ENABLED(CONFIG_S390)
528 { /* Set s390 specific PCI information */
529 struct zpci_dev *zdev;
530
531 zdev = to_zpci(pci_dev);
532 smc_dev->pci_fid = zdev->fid;
533 smc_dev->pci_pchid = zdev->pchid;
534 }
535#endif
536}
537
538struct smc_sock;
539struct smc_clc_msg_accept_confirm;
540
541void smc_lgr_cleanup_early(struct smc_link_group *lgr);
542void smc_lgr_terminate_sched(struct smc_link_group *lgr);
543void smc_lgr_hold(struct smc_link_group *lgr);
544void smc_lgr_put(struct smc_link_group *lgr);
545void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);
546void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport);
547void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid,
548 unsigned short vlan);
549void smc_smcd_terminate_all(struct smcd_dev *dev);
550void smc_smcr_terminate_all(struct smc_ib_device *smcibdev);
551int smc_buf_create(struct smc_sock *smc, bool is_smcd);
552int smc_uncompress_bufsize(u8 compressed);
553int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link,
554 struct smc_clc_msg_accept_confirm *clc);
555int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
556int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);
557void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
558 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey);
559void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
560 __be64 nw_vaddr, __be32 nw_rkey);
561void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
562void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);
563int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini);
564
565void smc_conn_free(struct smc_connection *conn);
566int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini);
567int smc_core_init(void);
568void smc_core_exit(void);
569
570int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
571 u8 link_idx, struct smc_init_info *ini);
572void smcr_link_clear(struct smc_link *lnk, bool log);
573void smcr_link_hold(struct smc_link *lnk);
574void smcr_link_put(struct smc_link *lnk);
575void smc_switch_link_and_count(struct smc_connection *conn,
576 struct smc_link *to_lnk);
577int smcr_buf_map_lgr(struct smc_link *lnk);
578int smcr_buf_reg_lgr(struct smc_link *lnk);
579void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type);
580void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
581 enum smc_lgr_type new_type, int asym_lnk_idx);
582int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *rmb_desc);
583struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
584 struct smc_link *from_lnk, bool is_dev_err);
585void smcr_link_down_cond(struct smc_link *lnk);
586void smcr_link_down_cond_sched(struct smc_link *lnk);
587int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb);
588int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
589int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb);
590int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
591
592static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
593{
594 return link->lgr;
595}
596#endif
597

source code of linux/net/smc/smc_core.h