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